[libpng10] Imported from libpng-1.0.37.tar

ANNOUNCE

@@ -1,22 +1,60 @@
 
-Libpng 1.2.8beta1 - November 1, 2004
+Libpng 1.0.37 - May 9, 2008
 
-This is not intended to be a public release.  It will be replaced
-within a few weeks by a public version or by another test version.
+This is a public release of libpng, intended for use in production codes.
 
-Changes since the last public release (1.2.7):
+Files available for download:
 
-  Fixed bug in png_text_compress() that would fail to complete a large block.
-version 1.2.8beta1 [November 1, 2004]
-  Fixed bug in png_text_compress() that would fail to complete a large block.
-  Fixed bug, introduced in libpng-1.2.7, that overruns a buffer during
-    strip alpha operation in png_do_strip_filler().
-  Added PNG_1_2_X definition in pngconf.h
-  #ifdef out png_info_init in png.c and png_read_init in pngread.c (as of 1.3.0)
+Source files with LF line endings (for Unix/Linux) and with a
+"configure" script
 
-Send comments/corrections/commendations to
-png-implement@ccrc.wustl.edu (subscription required; write to
-majordomo@ccrc.wustl.edu with "subscribe png-implement" in the message)
-or to glennrp@users.sourceforge.net
+   libpng-1.0.37.tar.gz
+   libpng-1.0.37.tar.lzma
+     (Get the lzma codec from <http://tukaani.org/lzma>).
+   libpng-1.0.37.tar.bz2
+
+Source files with LF line endings (for Unix/Linux) without the
+"configure" script
+
+   libpng-1.0.37-no-config.tar.gz
+   libpng-1.0.37-no-config.tar.lzma
+   libpng-1.0.37-no-config.tar.bz2
+
+Source files with CRLF line endings (for Windows), without the
+"configure" script
+
+   lpng1037.zip
+   lpng1037.7z
+   lpng1037.tar.bz2
+
+Project files
+
+   libpng-1.0.37-project-netware.zip
+   libpng-1.0.37-project-wince.zip
+
+Other information:
+
+   libpng-1.0.37-README.txt
+   libpng-1.0.37-KNOWNBUGS.txt
+   libpng-1.0.37-LICENSE.txt
+   libpng-1.0.37-Y2K-compliance.txt
+
+Changes since the last public release (1.0.34):
+
+version 1.0.37 [May 9, 2008]
+
+  Removed some stray *.diff and *.orig files
+  Reverted Makefile.in, aclocal.m4, and configure to the libpng-1.2.26
+    versions.
+  Added --force to autogen libtoolize options and --force-missing to
+    automake options.
+  Changed $(ECHO) to echo in Makefile.am and Makefile.in
+  Updated all configure files to autoconf-2.62
+  #ifdef out pnggcrd.c code if using MSC_VER
+
+Send comments/corrections/commendations to png-mng-implement at lists.sf.net
+(subscription required; visit 
+https://lists.sourceforge.net/lists/listinfo/png-mng-implement
+to subscribe) or to glennrp at users.sourceforge.net
 
 Glenn R-P

CHANGES

@@ -10,7 +10,7 @@ version 0.3
   split up pngwrite.c to several files
   added pnglib.txt
   added example.c
-  cleaned up writer, adding a few new tranformations
+  cleaned up writer, adding a few new transformations
   fixed some bugs in writer
   interfaced with zlib 0.5
   added K&R support
@@ -22,7 +22,7 @@ version 0.4
   created png_color_16 and png_color_8 to handle color needs
   cleaned up color type defines
   fixed various bugs
-  made various names more consistant
+  made various names more consistent
   interfaced with zlib 0.71
   cleaned up zTXt reader and writer (using zlib's Reset functions)
   split transformations into pngrtran.c and pngwtran.c
@@ -151,7 +151,7 @@ version 0.95 [March, 1997]
   added "packswap" transformation, which changes the endianness of
      packed-pixel bytes (Kevin Bracey)
   added "strip_alpha" transformation, which removes the alpha channel of
-     input images without using it (not neccesarily a good idea)
+     input images without using it (not necessarily a good idea)
   added "swap_alpha" transformation, which puts the alpha channel in front
      of the color bytes instead of after
   removed all implicit variable tests which assume NULL == 0 (I think)
@@ -172,7 +172,7 @@ version 0.95 [March, 1997]
   more chunk types tested in pngtest.c
   renamed pngrcb.c to pngset.c, and all png_read_<chunk> functions to be
      png_set_<chunk>.  We now have corresponding png_get_<chunk>
-     functions in pngget.c to get infomation in info_ptr.  This isolates
+     functions in pngget.c to get information in info_ptr.  This isolates
      the application from the internal organization of png_info_struct
      (good for shared library implementations).
 
@@ -522,9 +522,9 @@ version 1.0.5b [November 23, 1999]
   Updated scripts/makevms.com and added makevms.com to contrib/gregbook
     and contrib/pngminus (Martin Zinser)
 version 1.0.5c [November 26, 1999]
-  Moved png_get_header_version from png.h to png.c, to accomodate ansi2knr.
+  Moved png_get_header_version from png.h to png.c, to accommodate ansi2knr.
   Removed all global arrays (according to PNG_NO_GLOBAL_ARRAYS macro), to
-    accomodate making DLL's: Moved usr_png_ver from global variable to function
+    accommodate making DLL's: Moved usr_png_ver from global variable to function
     png_get_header_ver() in png.c.  Moved png_sig to png_sig_bytes in png.c and
     eliminated use of png_sig in pngwutil.c.  Moved the various png_CHNK arrays
     into pngtypes.h.  Eliminated use of global png_pass arrays.  Declared the
@@ -977,21 +977,15 @@ version 1.2.0beta1 [May 6, 2001]
   Bumped DLLNUM to 2.
   Re-enabled PNG_MNG_FEATURES_SUPPORTED and enabled PNG_ASSEMBLER_CODE_SUPPORTED
     by default.
-  Added runtime selection of MMX features.
-  Added png_set_strip_error_numbers function and related macros.
 version 1.2.0beta2 [May 7, 2001]
   Finished merging 1.2.0beta1 with version 1.0.11
   Added a check for attempts to read or write PLTE in grayscale PNG datastreams.
 version 1.2.0beta3 [May 17, 2001]
-  Enabled user memory function by default.
   Modified png_create_struct so it passes user mem_ptr to user memory allocator.
   Increased png_mng_features flag from png_byte to png_uint_32.
-  Bumped shared-library (so-number) and dll-number to 3.
 version 1.2.0beta4 [June 23, 2001]
   Check for missing profile length field in iCCP chunk and free chunk_data
      in case of truncated iCCP chunk.
-  Bumped shared-library number to 3 in makefile.sgi and makefile.sggcc
-  Bumped dll-number from 2 to 3 in makefile.cygwin
   Revised contrib/gregbook/rpng*-x.c to avoid a memory leak and to exit cleanly
      if user attempts to run it on an 8-bit display.
   Updated contrib/gregbook
@@ -1070,7 +1064,6 @@ version 1.2.2beta3 [March 7, 2002]
   Modified shared-library makefiles to install pkgconfig/libpngNN.pc.
   Export (with PNGAPI) png_zalloc, png_zfree, and png_handle_as_unknown
   Removed unused png_write_destroy_info prototype from png.h
-  Eliminated incorrect use of width_mmx from pnggccrd.c in pixel_bytes == 8 case
   Added install-shared target to all makefiles that make shared libraries.
   Stopped a double free of palette, hist, and trans when not using free_me.
   Added makefile.32sunu for Sun Ultra 32 and makefile.64sunu for Sun Ultra 64.
@@ -1265,8 +1258,6 @@ version 1.2.6beta3 [July 18, 2004]
   Updated scripts/makefile.vc(a)win32 (Cosmin).
   Updated the MSVC project (Simon-Pierre, Cosmin).
   Updated the Borland C++ Builder project (Cosmin).
-  Avoided access to asm_flags in pngvcrd.c, if PNG_1_0_X is defined (Cosmin).
-  Commented out warning about uninitialized mmx_support in pngvcrd.c (Cosmin).
   Removed scripts/makefile.bd32 and scripts/pngdef.pas (Cosmin).
   Added extra guard around inclusion of Turbo C memory headers, in pngconf.h
     (Cosmin).
@@ -1345,7 +1336,7 @@ version 1.0.16rc5 and 1.2.6rc5 [August 10, 2004]
   Moved  "PNG_HANDLE_CHUNK_*" macros out of PNG_ASSEMBLER_CODE_SUPPORTED
      section of png.h where they were inadvertently placed in version rc3.
 
-version 1.0.16 and 1.2.6 [August 15, 2004]
+version 1.2.6 and 1.0.16 [August 15, 2004]
   Revised pngtest so memory allocation testing is only done when PNG_DEBUG==1.
 version 1.2.7beta1 [August 26, 2004]
   Removed unused pngasmrd.h file.
@@ -1358,22 +1349,817 @@ version 1.2.7beta2 [August 28, 2004]
   Fixed bug with sCAL chunk and big-endian machines (David Munro).
   Undid new code added in 1.2.6rc2 to update the color_type in
     png_set_filler().
-  Added png_set_add_alpha() that updates color type.
 version 1.0.17rc1 and 1.2.7rc1 [September 4, 2004]
   Revised png_set_strip_filler() to not remove alpha if color_type has alpha.
-version 1.0.17 and 1.2.7 [September 12, 2004]
+
+version 1.2.7 and 1.0.17 [September 12, 2004]
   Added makefile.hp64
   Changed projects/msvc/png32ms.def to scripts/png32ms.def in makefile.cygwin
 version 1.2.8beta1 [November 1, 2004]
   Fixed bug in png_text_compress() that would fail to complete a large block.
   Fixed bug, introduced in libpng-1.2.7, that overruns a buffer during
     strip alpha operation in png_do_strip_filler().
-  Added PNG_1_2_X definition in pngconf.h
   #ifdef out png_info_init in png.c and png_read_init in pngread.c (as of 1.3.0)
+version 1.2.8beta2 [November 2, 2004]
+  Reduce color_type to a nonalpha type after strip alpha operation in
+    png_do_strip_filler().
+version 1.2.8beta3 [November 3, 2004]
+  Revised definitions of PNG_MAX_UINT_32, PNG_MAX_SIZE, and PNG_MAXSUM
+version 1.2.8beta4 [November 12, 2004]
+  Fixed (again) definition of PNG_LIBPNG_VER_DLLNUM in png.h (Cosmin).
+  Added PNG_LIBPNG_BUILD_PRIVATE in png.h (Cosmin).
+  Set png_ptr->zstream.data_type to Z_BINARY, to avoid unnecessary detection
+    of data type in deflate (Cosmin).
+  Deprecated but continue to support SPECIALBUILD and PRIVATEBUILD in favor of
+    PNG_LIBPNG_BUILD_SPECIAL_STRING and PNG_LIBPNG_BUILD_PRIVATE_STRING.
+version 1.2.8beta5 [November 20, 2004]
+  Use png_ptr->flags instead of png_ptr->transformations to pass
+    PNG_STRIP_ALPHA info to png_do_strip_filler(), to preserve ABI
+    compatibility.
+  Revised handling of SPECIALBUILD, PRIVATEBUILD, 
+    PNG_LIBPNG_BUILD_SPECIAL_STRING and PNG_LIBPNG_BUILD_PRIVATE_STRING.
+version 1.2.8rc1 [November 24, 2004]
+  Moved handling of BUILD macros from pngconf.h to png.h
+  Added definition of PNG_LIBPNG_BASE_TYPE in png.h, inadvertently
+    omitted from beta5.
+  Revised scripts/pngw32.rc
+  Despammed mailing addresses by masking "@" with "at".
+  Inadvertently installed a supposedly faster test version of pngrutil.c
+version 1.2.8rc2 [November 26, 2004]
+  Added two missing "\" in png.h
+  Change tests in pngread.c and pngpread.c to
+    if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA))
+       png_do_read_transformations(png_ptr);
+version 1.2.8rc3 [November 28, 2004]
+  Reverted pngrutil.c to version libpng-1.2.8beta5.
+  Added scripts/makefile.elf with supporting code in pngconf.h for symbol
+    versioning (John Bowler).
+version 1.2.8rc4 [November 29, 2004]
+  Added projects/visualc7 (Simon-pierre).
+version 1.2.8rc5 [November 29, 2004]
+  Fixed new typo in scripts/pngw32.rc
 
-Send comments/corrections/commendations to
-png-implement@ccrc.wustl.edu (subscription required; write to
-majordomo@ccrc.wustl.edu with "subscribe png-implement" in the message)
-or to glennrp@users.sourceforge.net
+version 1.2.8 [December 3, 2004]
+  Removed projects/visualc7, added projects/visualc71.
+
+version 1.2.9beta1 [February 21, 2006]
+
+  Initialized some structure members in pngwutil.c to avoid gcc-4.0.0 complaints
+  Revised man page and libpng.txt to make it clear that one should not call
+    png_read_end or png_write_end after png_read_png or png_write_png.
+  Updated references to png-mng-implement mailing list.
+  Fixed an incorrect typecast in pngrutil.c
+  Added PNG_NO_READ_SUPPORTED conditional for making a write-only library.
+  Added PNG_NO_WRITE_INTERLACING_SUPPORTED conditional.
+  Optimized alpha-inversion loops in pngwtran.c
+  Moved test for nonzero gamma outside of png_build_gamma_table() in pngrtran.c
+  Make sure num_trans is <= 256 before copying data in png_set_tRNS().
+  Make sure num_palette is <= 256 before copying data in png_set_PLTE().
+  Interchanged order of write_swap_alpha and write_invert_alpha transforms.
+  Added parentheses in the definition of PNG_LIBPNG_BUILD_TYPE (Cosmin).
+  Optimized zlib window flag (CINFO) in contrib/pngsuite/*.png (Cosmin).
+  Updated scripts/makefile.bc32 for Borland C++ 5.6 (Cosmin).
+  Exported png_get_uint_32, png_save_uint_32, png_get_uint_16, png_save_uint_16,
+    png_get_int_32, png_save_int_32, png_get_uint_31 (Cosmin).
+  Added type cast (png_byte) in png_write_sCAL() (Cosmin).
+  Fixed scripts/makefile.cygwin (Christian Biesinger, Cosmin).
+  Default iTXt support was inadvertently enabled.
+
+version 1.2.9beta2 [February 21, 2006]
+
+  Check for png_rgb_to_gray and png_gray_to_rgb read transformations before
+    checking for png_read_dither in pngrtran.c
+  Revised checking of chromaticity limits to accommodate extended RGB
+    colorspace (John Denker).
+  Changed line endings in some of the project files to CRLF, even in the
+    "Unix" tar distributions (Cosmin).
+  Made png_get_int_32 and png_save_int_32 always available (Cosmin).
+  Updated scripts/pngos2.def, scripts/pngw32.def and projects/wince/png32ce.def
+    with the newly exported functions.
+  Eliminated distributions without the "configure" script.
+  Updated INSTALL instructions.
+
+version 1.2.9beta3 [February 24, 2006]
+
+  Fixed CRCRLF line endings in contrib/visupng/VisualPng.dsp
+  Made libpng.pc respect EXEC_PREFIX (D. P. Kreil, J. Bowler)
+  Removed reference to pngasmrd.h from Makefile.am
+  Renamed CHANGES to ChangeLog.
+  Renamed LICENSE to COPYING.
+  Renamed ANNOUNCE to NEWS.
+  Created AUTHORS file.
+
+version 1.2.9beta4 [March 3, 2006]
+
+  Changed definition of PKGCONFIG from $prefix/lib to $libdir in configure.ac
+  Reverted to filenames LICENSE and ANNOUNCE; removed AUTHORS and COPYING.
+  Removed newline from the end of some error and warning messages.
+  Removed test for sqrt() from configure.ac and configure.
+  Made swap tables in pngtrans.c PNG_CONST (Carlo Bramix).
+  Disabled default iTXt support that was inadvertently enabled in
+    libpng-1.2.9beta1.
+  Added "OS2" to list of systems that don't need underscores, in pnggccrd.c
+  Removed libpng version and date from *.c files.
+
+version 1.2.9beta5 [March 4, 2006]
+  Removed trailing blanks from source files.
+  Put version and date of latest change in each source file, and changed
+    copyright year accordingly.
+  More cleanup of configure.ac, Makefile.ac, and associated scripts.
+  Restored scripts/makefile.elf which was inadvertently deleted.
+
+version 1.2.9beta6 [March 6, 2006]
+  Fixed typo (RELEASE) in configuration files.
+
+version 1.2.9beta7 [March 7, 2006]
+  Removed libpng.vers and libpng.sym from libpng12_la_SOURCES in Makefile.am
+  Fixed inconsistent #ifdef's around png_sig_bytes() and png_set_sCAL_s()
+    in png.h.
+  Updated makefile.elf as suggested by debian.
+  Made cosmetic changes to some makefiles, adding LN_SF and other macros.
+  Made some makefiles accept "exec_prefix".
+
+version 1.2.9beta8 [March 9, 2006]
+  Fixed some "#if defined (..." which should be "#if defined(..."
+    Bug introduced in libpng-1.2.8.
+  Fixed inconsistency in definition of png_default_read_data()
+  Restored blank that was lost from makefile.sggcc "clean" target in beta7.
+  Revised calculation of "current" and "major" for irix in ltmain.sh
+  Changed "mkdir" to "MKDIR_P" in some makefiles.
+  Separated PNG_EXPAND and PNG_EXPAND_tRNS.
+  Added png_set_expand_gray_1_2_4_to_8() and deprecated
+    png_set_gray_1_2_4_to_8() which also expands tRNS to alpha.
+
+version 1.2.9beta9 [March 10, 2006]
+  Include "config.h" in pngconf.h when available.
+  Added some checks for NULL png_ptr or NULL info_ptr (timeless)
+
+version 1.2.9beta10 [March 20, 2006]
+  Removed extra CR from contrib/visualpng/VisualPng.dsw (Cosmin)
+  Made pnggccrd.c PIC-compliant (Christian Aichinger).
+  Added makefile.mingw (Wolfgang Glas).
+  Revised pngconf.h MMX checking.
+
+version 1.2.9beta11 [March 22, 2006]
+  Fixed out-of-order declaration in pngwrite.c that was introduced in beta9
+  Simplified some makefiles by using LIBSO, LIBSOMAJ, and LIBSOVER macros.
+
+version 1.2.9rc1 [March 31, 2006]
+  Defined PNG_USER_PRIVATEBUILD when including "pngusr.h" (Cosmin).
+  Removed nonsensical assertion check from pngtest.c (Cosmin).
+
+version 1.2.9 [April 14, 2006]
+  Revised makefile.beos and added "none" selector in ltmain.sh
+
+version 1.2.10beta1 [April 15, 2006]
+  Renamed "config.h" to "png_conf.h" and revised Makefile.am to add
+    -DPNG_BUILDING_LIBPNG to compile directive, and modified pngconf.h
+    to include png_conf.h only when PNG_BUILDING_LIBPNG is defined.
+
+version 1.2.10beta2 [April 15, 2006]
+  Manually updated Makefile.in and configure.  Changed png_conf.h.in
+    back to config.h.
+
+version 1.2.10beta3 [April 15, 2006]
+  Change png_conf.h back to config.h in pngconf.h.
+
+version 1.2.10beta4 [April 16, 2006]
+  Change PNG_BUILDING_LIBPNG to PNG_CONFIGURE_LIBPNG in config/Makefile*.
+
+version 1.2.10beta5 [April 16, 2006]
+  Added a configure check for compiling assembler code in pnggccrd.c
+
+version 1.2.10beta6 [April 17, 2006]
+  Revised the configure check for pnggccrd.c
+  Moved -DPNG_CONFIGURE_LIBPNG into @LIBPNG_DEFINES@
+  Added @LIBPNG_DEFINES@ to arguments when building libpng.sym
+
+version 1.2.10beta7 [April 18, 2006]
+  Change "exec_prefix=$prefix" to "exec_prefix=$(prefix)" in makefiles.
+
+version 1.2.10rc1 [April 19, 2006]
+  Ensure pngconf.h doesn't define both PNG_USE_PNGGCCRD and PNG_USE_PNGVCRD
+  Fixed "LN_FS" typo in makefile.sco and makefile.solaris.
+
+version 1.2.10rc2 [April 20, 2006]
+  Added a backslash between -DPNG_CONFIGURE_LIBPNG and -DPNG_NO_ASSEMBLER_CODE
+   in configure.ac and configure
+  Made the configure warning about versioned symbols less arrogant.
+
+version 1.2.10rc3 [April 21, 2006]
+  Added a note in libpng.txt that png_set_sig_bytes(8) can be used when
+    writing an embedded PNG without the 8-byte signature.
+  Revised makefiles and configure to avoid making links to libpng.so.*
+
+version 1.2.10 [April 23, 2006]
+  Reverted configure to "rc2" state.
+
+version 1.2.11beta1 [May 31, 2006]
+  scripts/libpng.pc.in contained "configure" style version info and would
+    not work with makefiles.
+  The shared-library makefiles were linking to libpng.so.0 instead of
+    libpng.so.3 compatibility as the library.
+
+version 1.2.11beta2 [June 2, 2006]
+  Increased sprintf buffer from 50 to 52 chars in pngrutil.c to avoid
+    buffer overflow.
+  Fixed bug in example.c (png_set_palette_rgb -> png_set_palette_to_rgb)
+
+version 1.2.11beta3 [June 5, 2006]
+  Prepended "#! /bin/sh" to ltmail.sh and contrib/pngminus/*.sh (Cosmin).
+  Removed the accidental leftover Makefile.in~ (Cosmin).
+  Avoided potential buffer overflow and optimized buffer in
+    png_write_sCAL(), png_write_sCAL_s() (Cosmin).
+  Removed the include directories and libraries from CFLAGS and LDFLAGS
+    in scripts/makefile.gcc (Nelson A. de Oliveira, Cosmin).
+
+version 1.2.11beta4 [June 6, 2006]
+  Allow zero-length IDAT chunks after the entire zlib datastream, but not
+    after another intervening chunk type.
+
+version 1.0.19rc1, 1.2.11rc1 [June 13, 2006]
+  Deleted extraneous square brackets from [config.h] in configure.ac
+
+version 1.0.19rc2, 1.2.11rc2 [June 14, 2006]
+  Added prototypes for PNG_INCH_CONVERSIONS functions to png.h
+  Revised INSTALL and autogen.sh
+  Fixed typo in several makefiles (-W1 should be -Wl)
+  Added typedef for png_int_32 and png_uint_32 on 64-bit systems.
+
+version 1.0.19rc3, 1.2.11rc3 [June 15, 2006]
+  Removed the new typedefs for 64-bit systems (delay until version 1.4.0)
+  Added one zero element to png_gamma_shift[] array in pngrtran.c to avoid
+    reading out of bounds.
+
+version 1.0.19rc4, 1.2.11rc4 [June 15, 2006]
+  Really removed the new typedefs for 64-bit systems.
+
+version 1.0.19rc5, 1.2.11rc5 [June 22, 2006]
+  Removed png_sig_bytes entry from scripts/pngw32.def
+
+version 1.0.19, 1.2.11 [June 26, 2006]
+  None.
+
+version 1.0.20, 1.2.12 [June 27, 2006]
+  Really increased sprintf buffer from 50 to 52 chars in pngrutil.c to avoid
+    buffer overflow.
+
+version 1.2.13beta1 [October 2, 2006]
+  Removed AC_FUNC_MALLOC from configure.ac
+  Work around Intel-Mac compiler bug by setting PNG_NO_MMX_CODE in pngconf.h
+  Change "logical" to "bitwise" throughout documentation.
+  Detect and fix attempt to write wrong iCCP profile length.
+
+version 1.0.21, 1.2.13 [November 14, 2006]
+  Fix potential buffer overflow in sPLT chunk handler.
+  Fix Makefile.am to not try to link to noexistent files.
+  Check all exported functions for NULL png_ptr.
+
+version 1.2.14beta1 [November 17, 2006]
+  Relocated three misplaced tests for NULL png_ptr.
+  Built Makefile.in with automake-1.9.6 instead of 1.9.2.
+  Build configure with autoconf-2.60 instead of 2.59
+
+version 1.2.14beta2 [November 17, 2006]
+  Added some typecasts in png_zalloc().
+
+version 1.2.14rc1 [November 20, 2006]
+  Changed "strtod" to "png_strtod" in pngrutil.c
+
+version 1.0.22, 1.2.14    [November 27, 2006]
+  Added missing "$(srcdir)" in Makefile.am and Makefile.in
+
+version 1.2.15beta1 [December 3, 2006]
+  Generated configure with autoconf-2.61 instead of 2.60
+  Revised configure.ac to update libpng.pc and libpng-config.
+
+version 1.2.15beta2 [December 3, 2006]
+  Always export MMX asm functions, just stubs if not building pnggccrd.c
+
+version 1.2.15beta3 [December 4, 2006]
+  Add "png_bytep" typecast to profile while calculating length in pngwutil.c
+
+version 1.2.15beta4 [December 7, 2006]
+  Added scripts/CMakeLists.txt
+  Changed PNG_NO_ASSEMBLER_CODE to PNG_NO_MMX_CODE in scripts, like 1.4.0beta
+
+version 1.2.15beta5 [December 7, 2006]
+  Changed some instances of PNG_ASSEMBLER_* to PNG_MMX_* in pnggccrd.c
+  Revised scripts/CMakeLists.txt
+
+version 1.2.15beta6 [December 13, 2006]
+  Revised scripts/CMakeLists.txt and configure.ac
+
+version 1.2.15rc1 [December 18, 2006]
+  Revised scripts/CMakeLists.txt
+
+version 1.2.15rc2 [December 21, 2006]
+  Added conditional #undef jmpbuf in pngtest.c to undo #define in AIX headers.
+  Added scripts/makefile.nommx
+
+version 1.2.15rc3 [December 25, 2006]
+  Fixed shared library numbering error that was introduced in 1.2.15beta6.
+
+version 1.2.15rc4 [December 27, 2006]
+  Fixed handling of rgb_to_gray when png_ptr->color.gray isn't set.
+
+version 1.2.15rc5 [December 31, 2006]
+  Revised handling of rgb_to_gray.
+
+version 1.0.23, 1.2.15 [January 5, 2007]
+  Added some (unsigned long) typecasts in pngtest.c to avoid printing errors.
+
+version 1.2.16beta1 [January 6, 2007]
+  Fix bugs in makefile.nommx
+
+version 1.2.16beta2 [January 16, 2007]
+  Revised scripts/CMakeLists.txt
+ 
+version 1.0.24, 1.2.16 [January 31, 2007]
+  No changes.
+ 
+version 1.2.17beta1 [March 6, 2007]
+  Revised scripts/CMakeLists.txt to install both shared and static libraries.
+  Deleted a redundant line from pngset.c.
+ 
+version 1.2.17beta2 [April 26, 2007]
+  Relocated misplaced test for png_ptr == NULL in pngpread.c
+  Change "==" to "&" for testing PNG_RGB_TO_GRAY_ERR & PNG_RGB_TO_GRAY_WARN
+    flags.
+  Changed remaining instances of PNG_ASSEMBLER_* to PNG_MMX_*
+  Added pngerror() when write_IHDR fails in deflateInit2().
+  Added "const" to some array declarations.
+  Mention examples of libpng usage in the libpng*.txt and libpng.3 documents.
+
+version 1.2.17rc1 [May 4, 2007]
+  No changes.
+
+version 1.2.17rc2 [May 8, 2007]
+  Moved several PNG_HAVE_* macros out of PNG_INTERNAL because applications
+    calling set_unknown_chunk_location() need them.
+  Changed transformation flag from PNG_EXPAND_tRNS to PNG_EXPAND in
+    png_set_expand_gray_1_2_4_to_8().
+  Added png_ptr->unknown_chunk to hold working unknown chunk data, so it
+    can be free'ed in case of error.  Revised unknown chunk handling in
+    pngrutil.c and pngpread.c to use this structure.
+ 
+version 1.2.17rc3 [May 8, 2007]
+  Revised symbol-handling in configure script.
+
+version 1.2.17rc4 [May 10, 2007]
+  Revised unknown chunk handling to avoid storing unknown critical chunks.
+
+version 1.0.25 [May 15, 2007]
+version 1.2.17 [May 15, 2007]
+  Added "png_ptr->num_trans=0" before error return in png_handle_tRNS,
+    to eliminate a vulnerability (CVE-2007-2445, CERT VU#684664)
+
+version 1.0.26 [May 15, 2007]
+version 1.2.18 [May 15, 2007]
+  Reverted the libpng-1.2.17rc3 change to symbol-handling in configure script
+
+version 1.2.19beta1 [May 18, 2007]
+  Changed "const static" to "static PNG_CONST" everywhere, mostly undoing
+    change of libpng-1.2.17beta2.  Changed other "const" to "PNG_CONST"
+  Changed some handling of unused parameters, to avoid compiler warnings.
+    "if (unused == NULL) return;" becomes "unused = unused".
+
+version 1.2.19beta2 [May 18, 2007]
+  Only use the valid bits of tRNS value in png_do_expand() (Brian Cartier)
+
+version 1.2.19beta3 [May 19, 2007]
+  Add some "png_byte" typecasts in png_check_keyword() and write new_key
+  instead of key in zTXt chunk (Kevin Ryde).
+
+version 1.2.19beta4 [May 21, 2007]
+  Add png_snprintf() function and use it in place of sprint() for improved
+    defense against buffer overflows.
+
+version 1.2.19beta5 [May 21, 2007]
+  Fixed png_handle_tRNS() to only use the valid bits of tRNS value.
+  Changed handling of more unused parameters, to avoid compiler warnings.
+  Removed some PNG_CONST in pngwutil.c to avoid compiler warnings.
+
+version 1.2.19beta6 [May 22, 2007]
+  Added some #ifdef PNG_MMX_CODE_SUPPORTED where needed in pngvcrd.c
+  Added a special "_MSC_VER" case that defines png_snprintf to _snprintf
+
+version 1.2.19beta7 [May 22, 2007]
+  Squelched png_squelch_warnings() in pnggccrd.c and added an
+    #ifdef PNG_MMX_CODE_SUPPORTED block around the declarations that caused
+    the warnings that png_squelch_warnings was squelching.
+
+version 1.2.19beta8 [May 22, 2007]
+  Removed __MMX__ from test in pngconf.h.
+
+version 1.2.19beta9 [May 23, 2007]
+  Made png_squelch_warnings() available via PNG_SQUELCH_WARNINGS macro.
+  Revised png_squelch_warnings() so it might work.
+  Updated makefile.sgcc and makefile.solaris; added makefile.solaris-x86.
+
+version 1.2.19beta10 [May 24, 2007]
+  Resquelched png_squelch_warnings(), use "__attribute__((used))" instead.
+
+version 1.2.19beta11 [May 28, 2007]
+  Return 0 from png_get_sPLT() and png_get_unknown_chunks() if png_ptr is NULL;
+    changed three remaining instances of png_strcpy() to png_strncpy() (David
+    Hill).
+  Make test for NULL row_buf at the beginning of png_do_read_transformations
+    unconditional.
+
+version 1.2.19beta12 [May 28, 2007]
+  Revised pnggccrd.c.
+
+version 1.2.19beta13 [June 14, 2007]
+  Prefer PNG_USE_PNGVCRD when _MSC_VER is defined in pngconf.h
+
+version 1.2.19beta14 [June 16, 2007]
+  Fix bug with handling of 16-bit transparency, introduced in 1.2.19beta2
+
+version 1.2.19beta15 [June 17, 2007]
+  Revised pnggccrd.c.
+
+version 1.2.19beta16 [June 18, 2007]
+  Revised pnggccrd.c again.
+  Updated contrib/gregbook.
+  Changed '#include "pnggccrd.c"' to 'include "$srcdir/pnggccrd.c"'
+    in configure.ac
+
+version 1.2.19beta17 [June 19, 2007]
+  Revised many of the makefiles, to set -DPNG_NO_MMX_CODE where needed
+    and to not use -O3 unless -DPNG_NO_MMX_CODE is also set.
+
+version 1.2.19beta18 [June 23, 2007]
+  Replaced some C++ style comments with C style comments in pnggccrd.c.
+  Copied optimized C code from pnggccrd.c to pngrutil.c, removed dependency
+    on pnggccrd.o from many makefiles.
+  Added sl and dylib to list of extensions be installed by Makefile.am
+
+version 1.2.19beta19 [June 28, 2007]
+  Fixed testing PNG_RGB_TO_GRAY_ERR & PNG_RGB_TO_GRAY_WARN in pngrtran.c
+  More cleanup of pnggccrd.c and pngvcrd.c
+
+version 1.2.19beta20 [June 29, 2007]
+  Rebuilt Makefile.in and configure using libtool-1.5.24.
+  Fixed typo in pnggccrd.c
+
+version 1.2.19beta21 [June 30, 2007]
+  More revision of pnggccrd.c
+  Added "test" target to Makefile.in and Makefile.am
+
+version 1.2.19beta22 [July 3, 2007]
+  Added info about pngrutil/pnggccrd/pngvcrd to png_get_header_version()
+  Fix type definition of dummy_value_a, b in pnggccrd.c
+
+version 1.2.19beta23 [July 10, 2007]
+  Revert change to type definition of dummy_value_a, b in pnggccrd.c
+  Make sure __PIC__ is defined in pnggccrd.c when PIC is defined.
+  Require gcc-4.1 or better to use PNG_HAVE_MMX_FILTER_ROW on x86_64 platforms
+
+version 1.2.19beta24 [July 14, 2007]
+  Added PNG_NO_READ_FILTER, PNG_NO_WRITE_FILTER, PNG_NO_WARNING macros.
+  Added contrib/pngminim to demonstrate building minimal encoder and decoder
+
+version 1.2.19beta25 [July 15, 2007]
+  Removed the new PNG_NO_READ_FILTER macro since it would make the library
+    unable to read valid PNG files, and filtering is at the heart of the
+    PNG format.
+
+version 1.2.19beta26 [July 16, 2007]
+  Changed "png_free(str)" to "png_free(png_ptr,str)" in pngrutil.c WinCE
+    code (Yves Piguet).  This bug was introduced in libpng-1.2.14.
+  Updated scripts/CMakeLists.txt
+  Relocated a misplaced #endif in pnggccrd.c
+
+version 1.2.19beta27 [July 17, 2007]
+  Fixed incorrect stride and number of bytes copied (was 4 instead of
+    6 bytes) in the cleanup loop of pnggccrd.c and pngvcrd.c for handling
+    the end of 48-bit interlaced rows (Glenn R-P).
+
+version 1.2.19beta28 [July 19, 2007]
+  Removed requirement for gcc-4.1 or better to use PNG_HAVE_MMX_FILTER_ROW
+    on x86_64 platforms
+  Added png_warning() in pngrutil.c for short iCCP, iTXt, sPLT, or zTXT chunks.
+  Revised pngtest.c so warnings are displayed regardless of PNG_NO_STDIO.
+
+version 1.2.19beta29 [July 20, 2007]
+  Fix typo in pnggccrd.c (%%eax should be %%ax in secondloop48)
+
+version 1.2.19beta30 [July 26, 2007]
+  Revised pnggccrd.c
+
+version 1.2.19beta31 [July 27, 2007]
+  Fix typos in pnggccrd.c
+
+version 1.0.27rc1 and 1.2.19rc1 [July 31, 2007]
+  Disable PNG_MMX_CODE_SUPPORTED when PNG_ASSEMBLER_CODE_SUPPORTED is off.
+  Enable PNG_MMX_READ_FILTER_* by default, except when gcc-3.x is being
+    used (they were inadvertently disabled in libpng-1.2.19beta23).
+  Fix some debugging statements in pnggccrd.c and pngrutil.c
+  Added information about disabling the MMX code in libpng documentation.
+
+version 1.0.27rc2 and 1.2.19rc2 [August 4, 2007]
+  Removed some "#if 0" blocks.
+  Made a global struct local in pngvcrd.c to make it thread safe.
+  Issue a png_error() if application attempts to transform a row tht
+    has not been initialized.
+
+version 1.0.27rc3 and 1.2.19rc3 [August 9, 2007]
+  Slightly revised pngvcrd.c
+
+version 1.0.27rc4 and 1.2.19rc4 [August 9, 2007]
+  Revised pnggccrd.c debugging change of rc1, which was broken.
+  Revised scripts/CMakeLists.txt
+  Change default to PNG_NO_GLOBAL_ARRAYS for MSVC.
+  Turn off PNG_FLAG_ROW_INIT flag when setting transforms that expand pixels.
+
+version 1.0.27rc5 and 1.2.19rc5 [August 10, 2007]
+  Fix typo (missing '"') in pnggccrd.c
+  Revise handling of png_strtod in recent versions of WINCE
+
+version 1.0.27rc6 and 1.2.19rc6 [August 15, 2007]
+  Fix typo (missing ',') in contrib/gregbook/readpng2.c
+  Undid row initialization error exit added to rc2 and rc4.
+
+version 1.0.27 and 1.2.19 [August 18, 2007]
+  Conditionally restored row initialization error exit.
+
+version 1.2.20beta01 [August 19, 2007]
+  Fixed problem with compiling pnggccrd.c on Intel-Apple platforms.
+  Changed png_malloc() to png_malloc_warn() in png_set_sPLT().
+  Added PNG_NO_ERROR_TEXT feature, with demo in contrib/pngminim
+  Removed define PNG_WARN_UNINITIALIZED_ROW 1 /* 0: warning; 1: error */
+    because it caused some trouble.
+
+version 1.2.20beta02 [August 20, 2007]
+  Avoid compiling pnggccrd.c on Intel-Apple platforms.
+
+version 1.2.20beta03 [August 20, 2007]
+  Added "/D PNG_NO_MMX_CODE" to the non-mmx builds of projects/visualc6
+    and visualc71.
+
+version 1.2.20beta04 [August 21, 2007]
+  Revised pngvcrd.c for improved efficiency (Steve Snyder).
+
+version 1.2.20rc1 [August 23, 2007]
+  Revised pngconf.h to set PNG_NO_MMX_CODE for gcc-3.x compilers.
+
+version 1.2.20rc2 [August 27, 2007]
+  Revised scripts/CMakeLists.txt
+  Revised #ifdefs to ensure one and only one of pnggccrd.c, pngvcrd.c,
+    or part of pngrutil.c is selected.
+
+version 1.2.20rc3 [August 30, 2007]
+  Remove a little more code in pngwutil.c when PNG_NO_WRITE_FILTER is selected.
+  Added /D _CRT_SECURE_NO_WARNINGS to visual6c and visualc71 projects.
+  Compile png_mmx_support() in png.c even when PNG_NO_MMX_CODE is defined.
+  Restored a "superfluous" #ifdef that was removed from 1.2.20rc2 pnggccrd.c,
+    breaking the png_mmx_support() function.
+
+version 1.2.20rc4 [September 1, 2007]
+  Removed Intel contributions (MMX, Optimized C).
+
+version 1.2.20rc5 [September 2, 2007]
+  Restored configure and Makefile.in to rc3 and put a snippet of code in
+    pnggccrd.c, to ensure configure makes the same PNG_NO_MMX_CODE selection
+
+version 1.2.20rc6 [September 2, 2007]
+  Fixed bugs in scripts/CMakeLists.txt
+  Removed pngvcrd.c references from msvc projects.
+
+version 1.0.28 and 1.2.20 [September 8, 2007]
+  Removed "(NO READ SUPPORT)" from png_get_header_version() string.
+
+version 1.2.21beta1 [September 14, 2007]
+  Fixed various mistakes reported by George Cook and Jeff Phillips:
+  logical vs bitwise NOT in pngrtran.c, bug introduced in 1.2.19rc2
+  16-bit cheap transparency expansion, bug introduced in 1.2.19beta2
+  errors with sizeof(unknown_chunk.name), bugs introduced in 1.2.19beta11
+  <= compare with unsigned var in pngset.c, should be ==.
+
+version 1.2.21beta2 [September 18, 2007]
+  Removed some extraneous typecasts.
+
+version 1.2.21rc1 [September 25, 2007]
+  Fixed potential out-of-bounds reads in png_handle_pCAL() and
+    png_handle_ztXt() ("flayer" results reported by Tavis Ormandy).
+
+version 1.2.21rc2 [September 26, 2007]
+  Fixed potential out-of-bounds reads in png_handle_sCAL(),
+    png_handle_iTXt(), and png_push_read_tEXt().
+  Remove some PNG_CONST declarations from pngwutil.c to avoid compiler warnings
+  Revised makefiles to update paths in libpng.pc properly.
+
+version 1.2.21rc3 [September 27, 2007]
+  Revised makefiles to update "Libs" in libpng.pc properly.
+
+version 1.0.29 and 1.2.21rc3 [October 4, 2007]
+  No changes.
+
+version 1.2.22beta1 [October 4, 2007]
+  Again, fixed logical vs bitwise NOT in pngrtran.c, bug introduced
+    in 1.2.19rc2
+
+version 1.2.22beta2 [October 5, 2007]
+  Fixed string length error in pngset.c (caused crashes while decoding iCCP)
+  Add terminating NULL after each instance of png_strncpy().
+
+version 1.2.22beta3 [October 6, 2007]
+  Fix two off-by-one terminating NULL after png_strncpy().
+
+version 1.2.22beta4 [October 7, 2007]
+  Changed some 0 to '\0'.
+
+version 1.0.30rc1 and 1.2.22rc1 [October 8, 2007]
+  No changes.
+
+version 1.0.30 and 1.2.22 [October 13, 2007]
+  No changes.
+
+version 1.2.23beta01 [October 15, 2007]
+  Reduced number of invocations of png_strlen() in pngset.c.
+  Changed [azAZ09_] to [_abcde...89] in Makefile.am for better localization.
+
+version 1.2.23beta02 [October 16, 2007]
+  Eliminated png_strncpy() and png_strcpy() (Pierre Poissinger)
+  Changed $AN to $(AN) in Makefile.am.
+
+version 1.2.23beta03 [October 16, 2007]
+  Fixed off-by-one error in pngset.c
+  Restore statement to set last character of buffer to \0 in pngerror.c
+
+version 1.2.23beta04 [October 23, 2007]
+  Reject attempt to set all-zero cHRM values.
+
+version 1.2.23beta05 [October 26, 2007]
+  Add missing quotes in projects/visualc6, lost in version 1.2.20rc3
+
+version 1.2.23rc01 [November 2, 2007]
+  No changes.
+
+version 1.2.23 [November 6, 2007]
+  No changes.
+
+version 1.2.24beta01 [November 19, 2007]
+  Moved misplaced test for malloc failure in png_set_sPLT().  This bug was
+    introduced in libpng-1.2.20beta01.
+  Ifdef out avg_row etc from png.h and pngwrite.c when PNG_NO_WRITE_FILTER
+  Do not use png_ptr->free_fn and png_ptr->mem_fn in png_destroy_read_struct()
+    when png_ptr is NULL (Marshall Clow).
+  Updated handling of symbol prefixes in Makefile.am and configure.ac (Mike
+    Frysinger).
+
+version 1.2.24beta02 [November 30, 2007]
+  Removed a useless test and fixed incorrect test in png_set_cHRM_fixed()
+    (David Hill).
+
+version 1.2.24rc01 [December 7, 2007]
+  No changes.
+
+version 1.2.24     [December 14, 2007]
+  Make sure not to redefine _BSD_SOURCE in pngconf.h
+  Revised gather.sh and makefile.std in contrib/pngminim to avoid compiling
+    unused files.
+
+version 1.2.25beta01 [January 7, 2008]
+  Fixed bug with unknown chunk handling, introduced in version 1.2.17rc2
+
+version 1.2.25beta02 [January 10, 2008]
+  Prevent gamma from being applied twice.
+
+version 1.2.25rc01 [January 17, 2008]
+  No changes.
+
+version 1.2.25beta03 [January 22, 2008]
+  Fixed some continue-after-malloc-failure errors in pngset.c (David Hill)
+  Check for info_ptr == NULL in png_read_info() and png_process_data().
+  Check for possible use of NULL user_png_ver[] in png_create_read_struct().
+  Change "if (swidth == NULL)" to "if (sheight == NULL)" in png_handle_sCAL
+    (bug introduced in libpng-1.2.4/1.0.13).
+  Return from png_destroy_read_struct() if png_ptr_ptr is NULL.
+  Fix overflow of "msg" in png_decompress_chunk().
+
+version 1.2.25beta04 [January 26, 2008]
+  Work around Coverity bug report by slightly refactoring
+    png_read_push_finish_row()
+
+version 1.2.25beta05 [January 31, 2008]
+  Added libpng-1.2.25beta05.tar.lzma to distribution.  Get the lzma codec
+    from <http://tukaani.org/lzma>.
+  Added lp1225b05.7z to distribution.  Get the 7-zip decoder from
+    from <http://www.7-zip.org>.
+  Fixed some broken links in the README file.
+
+version 1.2.25beta06 [February 6, 2008]
+  Refactored png_read_push_finish_row() again, trying to satisfy Coverity.
+  Fixed potential NULL dereference of png_ptr in png_destroy_write_struct();
+  clarified potential NULL dereference of png_ptr in png_destroy_read_struct();
+  fixed potential NULL dereference of info_ptr in png_handle_bKGD();
+  fixed potential NULL dereference of user_png_ver[] in
+    png_create_write_struct_2(). (Coverity)
+
+version 1.2.25rc02 [February 10, 2008]
+  Reset png_ptr->pass in png_read_push_finish_row() before break.
+  Changed "pass" from png_byte to int.
+
+version 1.2.25 and 1.0.31 [February 18, 2008]
+  No changes.
+
+version 1.2.26beta01 [February 21, 2008]
+  Added missing "(" in pngmem.c.  Bug introduced in libpng-1.2.2/1.0.13
+
+version 1.2.26beta02 [March 12, 2008]
+  Refined error message returned from deflateInit2 in pngwutil.c
+  Check IHDR length in png_push_read_chunk() before saving it.
+
+version 1.2.26beta03 [March 16, 2008]
+  Revised contrib/gregbook to handle premature end-of-file and file
+    read errors correctly.
+
+version 1.2.26beta04 [March 18, 2008]
+  Free png_ptr->big_row_buf and png_ptr->prev_row before allocating
+    new copies in png_read_start_row().  Bug introduced in libpng-1.2.22.
+
+version 1.2.26beta05 [March 19, 2008]
+  Removed extra png_free() added in libpng-1.2.26beta04.
+
+version 1.2.26beta06 [March 19, 2008]
+  Avoid reallocating big_row_buf and prev_row when the size does not increase.
+
+version 1.2.26rc01 [March 26, 2008]
+  Ifdef out some code that is unused when interlacing is not supported.
+
+versions 1.0.32 and 1.2.26 [April 2, 2008]
+  No changes.
+
+version 1.2.27beta01 [April 12, 2008]
+  Fixed bug (introduced in libpng-1.0.5h) with handling zero-length
+    unknown chunks.
+  Added more information about png_set_keep_unknown_chunks() to the
+    documetation.
+  Reject tRNS chunk with out-of-range samples instead of masking off
+    the invalid high bits as done in since libpng-1.2.19beta5.
+
+version 1.2.27beta02 [April 13, 2008]
+  Revised documentation about unknown chunk and user chunk handling.
+  Keep tRNS chunk with out-of-range samples and issue a png_warning().
+
+version 1.2.27beta03 [April 14, 2008]
+  Added check for NULL ptr in TURBOC version of png_free_default().
+  Removed several unnecessary checks for NULL before calling png_free().
+  Revised png_set_tRNS() so that calling it twice removes and invalidates
+    the previous call.
+  Revised pngtest to check for out-of-range tRNS samples.
+
+version 1.2.27beta04 [April 18, 2008]
+  Added AC_LIBTOOL_WIN32_DLL to configure.ac
+  Rebuilt Makefile.in, aclocal.m4, and configure with autoconf-2.62
+
+version 1.2.27beta05 [April 19, 2008]
+  Added MAINTEINERCLEANFILES variable to Makefile.am
+
+version 1.2.27beta06 [April 21, 2008]
+  Avoid changing color_type from GRAY to RGB by
+    png_set_expand_gray_1_2_4_to_8().
+
+version 1.2.27rc01 [April 23, 2008]
+  Fix broken URL for rfc2083 in png.5 and libpng-*.txt
+
+version 1.0.33 and 1.2.27 [April 30, 2008]
+  No changes.
+
+version 1.0.34 and 1.2.28 [April 30, 2008]
+  Rebuilt Makefile.in, aclocal.m4, and configure with autoconf-2.61
+    due to backward incompatibilities.
+  Removed a stray object file from contrib/gregbook
+
+version 1.2.29beta01 [May 1, 2008]
+  Removed some stray *.diff and *.orig files
+
+version 1.2.29beta02 [May 1, 2008]
+  Reverted Makefile.in, aclocal.m4, and configure to the libpng-1.2.26
+    versions.
+
+version 1.2.29beta03 [May 2, 2008]
+  Added --force to autogen libtoolize options and --force-missing to
+    automake options.
+  Changed $(ECHO) to echo in Makefile.am and Makefile.in
+  Updated all configure files to autoconf-2.62
+  #ifdef out pnggcrd.c code if using MSC_VER
+
+version 1.2.29rc01 [May 4, 2008]
+  No changes.
+
+version 1.0.35 and 1.2.29 [May 8, 2008]
+  No changes.
+
+version 1.0.37 [May 9, 2008]
+  Updated Makefile.in and configure (omitted version 1.0.36).
+
+Send comments/corrections/commendations to png-mng-implement at lists.sf.net
+(subscription required; visit
+https://lists.sourceforge.net/lists/listinfo/png-mng-implement
+to subscribe)
+or to glennrp at users.sourceforge.net
 
 Glenn R-P

INSTALL

@@ -1,16 +1,50 @@
 
-Installing libpng version 1.2.8beta1 - November 1, 2004
+Installing libpng version 1.0.37 - May 9, 2008
 
-Before installing libpng, you must first install zlib.  zlib
-can usually be found wherever you got libpng.  zlib can be
-placed in another directory, at the same level as libpng.
-Note that your system might already have a preinstalled
-zlib, but you will still need to have access to the
-zlib.h and zconf.h include files that correspond to the
-version of zlib that's installed.
+On Unix/Linux and similar systems, you can simply type
+
+    ./configure [--prefix=/path]
+    make check
+    make install
+
+and ignore the rest of this document.
+
+If configure does not work on your system and you have a reasonably
+up-to-date set of tools, running ./autogen.sh before running ./configure
+may fix the problem.  You can also run the individual commands in
+autogen.sh with the --force option, if supported by your version of
+the tools.  If you run 'libtoolize --force', though, this will replace
+the distributed, patched, version of ltmain.sh with an unpatched version
+and your shared library builds may fail to produce libraries with the
+correct version numbers.
+
+Instead, you can use one of the custom-built makefiles in the
+"scripts" directory
+
+    cp scripts/makefile.system makefile
+    make test
+    make install
+
+Or you can use one of the "projects" in the "projects" directory.
+
+If you want to use "cmake" (see www.cmake.org), copy CMakeLists.txt
+from the "scripts" directory to this directory and type
+
+   cmake . [-DPNG_MMX=YES] -DCMAKE_INSTALL_PREFIX=/path
+   make
+   make install
+
+Before installing libpng, you must first install zlib, if it
+is not already on your system.  zlib can usually be found
+wherever you got libpng.  zlib can be placed in another directory,
+at the same level as libpng.
+
+If your system already has a preinstalled zlib you will still need
+to have access to the zlib.h and zconf.h include files that
+correspond to the version of zlib that's installed.
 
 You can rename the directories that you downloaded (they
-might be called "libpng-1.2.8beta1" or "lpng109" and "zlib-1.2.1"
+might be called "libpng-1.0.37" or "lpng109" and "zlib-1.2.1"
 or "zlib121") so that you have directories called "zlib" and "libpng".
 
 Your directory structure should look like this:
@@ -47,7 +81,6 @@ If the line endings in the files look funny, you may wish to get the other
 distribution of libpng.  It is available in both tar.gz (UNIX style line
 endings) and zip (DOS style line endings) formats.
 
-
 If you are building libpng with MSVC, you can enter the
 libpng projects\visualc6 directory and follow the instructions in
 projects\visualc6\README.txt.
@@ -59,18 +92,18 @@ build libpng for Netware or Beos as instructed in projects\netware.txt
 or projects\beos.
 
 Else enter the zlib directory and follow the instructions in zlib/README,
-then come back here and choose the appropriate makefile.sys in the scripts
-directory.
+then come back here and run "configure" or choose the appropriate
+makefile.sys in the scripts directory.
 
 The files that are presently available in the scripts directory
 include
 
+ CMakeLists.txt    =>  "cmake" script
  makefile.std      =>  Generic UNIX makefile (cc, creates static libpng.a)
+ makefile.elf      =>  Linux/ELF makefile symbol versioning,
+                       gcc, creates libpng10.so.0.1.0.37)
  makefile.linux    =>  Linux/ELF makefile
-                       (gcc, creates libpng12.so.0.1.2.8beta1)
- makefile.gcmmx    =>  Linux/ELF makefile
-                       (gcc, creates libpng12.so.0.1.2.8beta1,
-                       uses assembler code tuned for Intel MMX platform)
+                       (gcc, creates libpng10.so.0.1.0.37)
  makefile.gcc      =>  Generic makefile (gcc, creates static libpng.a)
  makefile.knr      =>  Archaic UNIX Makefile that converts files with
                        ansi2knr (Requires ansi2knr.c from
@@ -87,17 +120,19 @@ include
  makefile.intel    =>  Intel C/C++ version 4.0 and later
  libpng.icc        =>  Project file for IBM VisualAge/C++ version 4.0 or later
  makefile.netbsd   =>  NetBSD/cc makefile, uses PNGGCCRD, makes libpng.so.
- makefile.ne12bsd  =>  NetBSD/cc makefile, uses PNGGCCRD,
-                       makes libpng12.so
+ makefile.ne10bsd  =>  NetBSD/cc makefile, uses PNGGCCRD,
+                       makes libpng10.so
  makefile.openbsd  =>  OpenBSD makefile
  makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
  makefile.sggcc    =>  Silicon Graphics (gcc,
-                       creates libpng12.so.0.1.2.8beta1)
+                       creates libpng10.so.0.1.0.37)
  makefile.sunos    =>  Sun makefile
  makefile.solaris  =>  Solaris 2.X makefile (gcc,
-                       creates libpng12.so.0.1.2.8beta1)
+                       creates libpng10.so.0.1.0.37)
+ makefile.solaris-x86 =>  Solaris/intelMMX 2.X makefile (gcc,
+                       creates libpng10.so.0.1.0.37)
  makefile.so9      =>  Solaris 9 makefile (gcc,
-                       creates libpng12.so.0.1.2.8beta1)
+                       creates libpng10.so.0.1.0.37)
  makefile.32sunu   =>  Sun Ultra 32-bit makefile
  makefile.64sunu   =>  Sun Ultra 64-bit makefile
  makefile.sco      =>  For SCO OSr5  ELF and Unixware 7 with Native cc
@@ -113,10 +148,7 @@ include
  makefile.tc3      =>  Turbo C 3.0 makefile
  makefile.dj2      =>  DJGPP 2 makefile
  makefile.msc      =>  Microsoft C makefile
- makefile.vcawin32 =>  makefile for Microsoft Visual C++ 5.0 and later (uses
-                       assembler code tuned for Intel MMX platform)
- makefile.vcwin32  =>  makefile for Microsoft Visual C++ 4.0 and later (does
-                       not use assembler code)
+ makefile.vcwin32  =>  makefile for Microsoft Visual C++ 4.0 and later
  makefile.os2      =>  OS/2 Makefile (gcc and emx, requires pngos2.def)
  pngos2.def        =>  OS/2 module definition file used by makefile.os2
  makefile.watcom   =>  Watcom 10a+ Makefile, 32-bit flat memory model
@@ -165,3 +197,23 @@ instead, as demonstrated in contrib/visupng of the libpng distribution.
 Further information can be found in the README and libpng.txt
 files, in the individual makefiles, in png.h, and the manual pages
 libpng.3 and png.5.
+
+
+Using the ./configure script -- 16 December 2002.
+=================================================
+
+
+The ./configure script should work compatibly with what scripts/makefile.*
+did, however there are some options you need to add to configure explicitly,
+which previously was done semi-automatically (if you didn't edit
+scripts/makefile.* yourself, that is)
+
+
+CFLAGS="-Wall -O -funroll-loops \
+-malign-loops=2 -malign-functions=2" ./configure --prefix=/usr/include \
+--with-pkgconfigdir=/usr/lib/pkgconfig --includedir=/usr/include
+
+You can alternatively specify --includedir=/usr/include, /usr/local/include,
+/usr/include/png12, or whatever.
+
+

KNOWNBUG

@@ -1,11 +1,22 @@
 
-Known bugs in libpng version 1.2.8beta1
+Known bugs in libpng version 1.0.37
 
-1. April 22, 2001: pnggccrd.c has been reported to crash on NetBSD when
-   reading interlaced PNG files, when assembler code is enabled but running
-   on a non-MMX i386 platform.
+1. February 23, 2006: The custom makefiles don't build libpng with -lz.
 
-   STATUS: Under investigation.  The change to pnggccrd.c in libpng-1.2.1
-   fixed a problem under FreeBSD but not the problem with NetBSD, which
-   still fails as of libpng-1.2.2rc1.
+   STATUS: This is a subject of debate. The change will probably be made
+   as a part of a major overhaul of the makefiles in libpng version 1.4.0.
+
+2. February 24, 2006: The Makefile generated by the "configure" script
+   fails to install symbolic links
+   libpng12.so => libpng12.so.0.1.2.9betaN
+   that are generated by the custom makefiles.
+
+3. September 4, 2007:  There is a report that pngtest crashes on MacOS 10.
+
+   STATUS: workarounds are
+      1) Compile without optimization (crashes are observed with
+         -arch i386 and -O2 or -O3, using gcc-4.0.1).
+      2) Compile pngtest.c with PNG_DEBUG defined (the bug goes away if
+         you try to look at it).
+      3) Ignore the crash.  The library itself seems to be OK.
 

LICENSE

@@ -8,8 +8,8 @@ COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
 If you modify libpng you may insert additional notices immediately following
 this sentence.
 
-libpng version 1.2.6, November 1, 2004, is
-Copyright (c) 2004 Glenn Randers-Pehrson, and is
+libpng versions 1.2.6, August 15, 2004, through 1.0.37, May 9, 2008, are
+Copyright (c) 2004, 2006-2008 Glenn Randers-Pehrson, and are
 distributed according to the same disclaimer and license as libpng-1.2.5
 with the following individual added to the list of Contributing Authors
 
@@ -105,5 +105,5 @@ Libpng is OSI Certified Open Source Software.  OSI Certified Open Source is a
 certification mark of the Open Source Initiative.
 
 Glenn Randers-Pehrson
-glennrp@users.sourceforge.net
-November 1, 2004
+glennrp at users.sourceforge.net
+May 9, 2008

Makefile.am

@@ -0,0 +1,152 @@
+# Makefile.am:
+#   Source file for Makefile.in (and hence Makefile)
+#
+# Makefile.am need only be changed on a major version number
+# change (e.g. libpng12 --> libpng13).  In that case seach
+# this file for every instance of the old base name (libpng12)
+# and change to the new one (libpng13), then change the
+# -version-number settings below so that the new values have
+# the correct major part (first field).
+
+PNGLIB_BASENAME= libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@
+
+# libpng does not follow GNU file name conventions
+AUTOMAKE_OPTIONS = foreign
+
+# test programs - run on make check, make distcheck
+check_PROGRAMS= pngtest
+pngtest_SOURCES = pngtest.c
+pngtest_LDADD = libpng10.la
+TESTS = test-pngtest.sh
+TESTS_ENVIRONMENT= srcdir=$(srcdir) 
+
+# man pages
+dist_man_MANS= libpng.3 libpngpf.3 png.5
+
+# generate the -config scripts if required
+binconfigs= libpng10-config 
+EXTRA_SCRIPTS= libpng-config libpng10-config
+bin_SCRIPTS= @binconfigs@
+
+# rules to build libpng, only build the old library on request
+lib_LTLIBRARIES=libpng10.la @compatlib@
+EXTRA_LTLIBRARIES= libpng.la
+libpng10_la_SOURCES = png.c pngset.c pngget.c pngrutil.c pngtrans.c pngwutil.c \
+	pngread.c pngrio.c pngwio.c pngwrite.c pngrtran.c \
+	pngwtran.c pngmem.c pngerror.c pngpread.c \
+	png.h pngconf.h
+libpng_la_SOURCES = $(libpng10_la_SOURCES)
+
+libpng_la_CPPFLAGS = @LIBPNG_DEFINES@
+libpng10_la_CPPFLAGS = @LIBPNG_DEFINES@
+
+# MAJOR UPGRADE: the version-number settings below must be changed.
+libpng10_la_LDFLAGS = -no-undefined -export-dynamic \
+	-version-number 0:@PNGLIB_RELEASE@:0
+# -rpath is needed as automake doesn't know the directory
+libpng_la_LDFLAGS = -rpath '$(libdir)' -no-undefined -export-dynamic \
+	-version-number 2:@PNGLIB_RELEASE@:0
+
+if HAVE_LD_VERSION_SCRIPT
+  # Versioned symbols and restricted exports
+  libpng10_la_LDFLAGS += -Wl,--version-script=libpng.vers
+  libpng10_la_DEPENDENCIES = libpng.vers
+else
+  # Only restricted exports when possible
+  libpng10_la_LDFLAGS += -export-symbols libpng.sym
+  libpng10_la_DEPENDENCIES = libpng.sym
+endif
+libpng_la_DEPENDENCIES = $(libpng10_la_DEPENDENCIES)
+
+# Avoid depending upon Character Ranges.
+AN = '_abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
+
+#distribute headers in /usr/include/libpng/*
+pkgincludedir= $(includedir)/$(PNGLIB_BASENAME)
+pkginclude_HEADERS= png.h pngconf.h
+
+# pkg-config stuff, note that libpng.pc is always required in order
+# to get the correct library
+pkgconfigdir = @pkgconfigdir@
+pkgconfig_DATA = libpng10.pc
+
+#extra source distribution files.
+EXTRA_DIST= \
+	ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO \
+	pngtest.png pngbar.png pngnow.png pngbar.jpg autogen.sh \
+	${srcdir}/projects/cbuilder5/* \
+	${srcdir}/projects/beos/* \
+	${srcdir}/projects/visualc6/* \
+	${srcdir}/projects/visualc71/* \
+	${srcdir}/projects/wince.txt \
+	${srcdir}/projects/netware.txt \
+	${srcdir}/scripts/* \
+	${srcdir}/contrib/gregbook/* \
+	${srcdir}/contrib/pngminus/* \
+	${srcdir}/contrib/pngsuite/* \
+	${srcdir}/contrib/visupng/* \
+	$(TESTS) \
+	example.c libpng-1.0.37.txt pngvcrd.c 
+
+CLEANFILES= pngout.png libpng10.pc libpng10-config libpng.vers \
+libpng.sym
+
+MAINTAINERCLEANFILES = Makefile.in aclocal.m4 config.guess config.h.in \
+config.sub configure depcomp install-sh ltmain.sh missing
+
+$(PNGLIB_BASENAME).pc: libpng.pc
+	cp libpng.pc $@
+
+$(PNGLIB_BASENAME)-config: libpng-config
+	cp libpng-config $@
+
+libpng.sym: png.h pngconf.h
+	rm -f $@ $@.new
+	$(CPP) @LIBPNG_DEFINES@ $(CPPFLAGS) -DPNG_BUILDSYMS $(srcdir)/png.h | \
+		$(SED) -n -e \
+		's|^.*PNG_FUNCTION_EXPORT[ 	]*\([$(AN)]*\).*$$|$(SYMBOL_PREFIX)\1|p' \
+		-e 's|^.*PNG_DATA_EXPORT[ 	]*\([$(AN)]*\).*$$|$(SYMBOL_PREFIX)\1|p' \
+			>$@.new
+	mv $@.new $@
+
+libpng.vers: libpng.sym
+	rm -f $@ $@.new
+	echo PNG@PNGLIB_MAJOR@@PNGLIB_MINOR@_0 '{global:' > $@.new
+	$(SED) s/$$/\;/ libpng.sym >> $@.new
+	echo 'local: *; };' >> $@.new
+	mv $@.new $@
+
+test: check
+
+# install the .../include headers as links to the new ones
+install-data-hook:
+	cd $(DESTDIR)$(includedir); rm -f png.h pngconf.h
+	cd $(DESTDIR)$(includedir); $(LN_S) $(PNGLIB_BASENAME)/png.h png.h
+	cd $(DESTDIR)$(includedir); $(LN_S) $(PNGLIB_BASENAME)/pngconf.h pngconf.h
+	cd $(DESTDIR)$(pkgconfigdir); rm -f libpng.pc
+	cd $(DESTDIR)$(pkgconfigdir); $(LN_S) $(PNGLIB_BASENAME).pc libpng.pc
+
+# do evil things to libpng to cause libpng10 to be used
+install-exec-hook:
+	cd $(DESTDIR)$(bindir); rm -f libpng-config
+	cd $(DESTDIR)$(bindir); $(LN_S) $(PNGLIB_BASENAME)-config libpng-config
+	@set -x;\
+	cd $(DESTDIR)$(libdir);\
+	for ext in a la so sl dylib; do\
+		rm -f libpng.$$ext;\
+                if test -f $(PNGLIB_BASENAME).$$ext; then\
+                       $(LN_S) $(PNGLIB_BASENAME).$$ext libpng.$$ext;\
+                fi;\
+	done
+
+uninstall-hook:
+	cd $(DESTDIR)$(includedir); rm -f png.h pngconf.h
+	rm -f $(DESTDIR)$(pkgconfigdir)/libpng.pc
+	rm -f $(DESTDIR)$(bindir)/libpng-config
+	@if test -n "@compatlib@"; then\
+		set -x;\
+		cd $(DESTDIR)$(libdir);\
+		for ext in a la so sl dylib; do\
+			rm -f libpng.$$ext;\
+		done;\
+	fi

README

@@ -1,11 +1,12 @@
-README for libpng version 1.2.8beta1 - November 1, 2004 (shared library 12.0)
+README for libpng version 1.0.37 - May 9, 2008 (shared library 10.0)
 See the note about version numbers near the top of png.h
 
 See INSTALL for instructions on how to install libpng.
 
-Libpng comes in several distribution formats.  Get libpng-*.tar.gz
-or libpng-*.tar.bz2 if you want UNIX-style line endings in the text
-files, or lpng*.zip if you want DOS-style line endings.
+Libpng comes in several distribution formats.  Get libpng-*.tar.gz,
+libpng-*.tar.lzma, or libpng-*.tar.bz2 if you want UNIX-style line
+endings in the text files, or lpng*.7z or lpng*.zip if you want DOS-style
+line endings.
 
 Version 0.89 was the first official release of libpng.  Don't let the
 fact that it's the first release fool you.  The libpng library has been in
@@ -77,12 +78,12 @@ compression library that is useful for more things than just PNG files.
 You can use zlib as a drop-in replacement for fread() and fwrite() if
 you are so inclined.
 
-zlib should be available at the same place that libpng is, or at.
-ftp://ftp.info-zip.org/pub/infozip/zlib
+zlib should be available at the same place that libpng is, or at
+ftp://ftp.simplesystems.org/pub/png/src/
 
 You may also want a copy of the PNG specification.  It is available
 as an RFC, a W3C Recommendation, and an ISO/IEC Standard.  You can find
-these at http://www.libpng.org/pub/png/documents/
+these at http://www.libpng.org/pub/png/pngdocs.html
 
 This code is currently being archived at libpng.sf.net in the
 [DOWNLOAD] area, and on CompuServe, Lib 20 (PNG SUPPORT)
@@ -103,17 +104,18 @@ fix.  Please mention "libpng" somewhere in the subject line.  Thanks.
 This release was created and will be supported by myself (of course
 based in a large way on Guy's and Andreas' earlier work), and the PNG group.
 
-glennrp@users.sourceforge.net
-png-implement@ccrc.wustl.edu (subscription required; write to
-majordomo@ccrc.wustl.edu with "subscribe png-implement" in the message).
+Send comments/corrections/commendations to png-mng-implement at lists.sf.net
+(subscription required; visit 
+https://lists.sourceforge.net/lists/listinfo/png-mng-implement
+to subscribe) or to glennrp at users.sourceforge.net
 
 You can't reach Guy, the original libpng author, at the addresses
 given in previous versions of this document.  He and Andreas will read mail
 addressed to the png-implement list, however.
 
 Please do not send general questions about PNG.  Send them to
-the (png-list@ccrc.wustl.edu, subscription required, write to
-majordomo@ccrc.wustl.edu with "subscribe png-list" in your message).
+the (png-mng-misc at lists.sourceforge.net, subscription required, visit
+https://lists.sourceforge.net/lists/listinfo/png-mng-implement to subscribe)
 On the other hand,
 please do not send libpng questions to that address, send them to me
 or to the png-implement list.  I'll
@@ -124,7 +126,7 @@ and ...".  If in doubt, send questions to me.  I'll bounce them
 to others, if necessary.
 
 Please do not send suggestions on how to change PNG.  We have
-been discussing PNG for nine years now, and it is official and
+been discussing PNG for twelve years now, and it is official and
 finished.  If you have suggestions for libpng, however, I'll
 gladly listen.  Even if your suggestion is not used immediately,
 it may be used later.
@@ -139,6 +141,7 @@ Files in this distribution:
       TODO          =>  Things not implemented in the current library
       Y2KINFO       =>  Statement of Y2K compliance
       example.c     =>  Example code for using libpng functions
+      libpng-*-*-diff.txt => Diff from previous release
       libpng.3      =>  manual page for libpng (includes libpng.txt)
       libpng.txt    =>  Description of libpng and its functions
       libpngpf.3    =>  manual page for libpng's private functions
@@ -146,7 +149,6 @@ Files in this distribution:
       png.c         =>  Basic interface functions common to library
       png.h         =>  Library function and interface declarations
       pngconf.h     =>  System specific library configuration
-      pngasmrd.h    =>  Header file for assembler-coded functions
       pngerror.c    =>  Error/warning message I/O functions
       pngget.c      =>  Functions for retrieving info from struct
       pngmem.c      =>  Memory handling functions
@@ -188,10 +190,12 @@ Files in this distribution:
       scripts       =>  Directory containing scripts for building libpng:
        descrip.mms      =>  VMS makefile for MMS or MMK
        makefile.std     =>  Generic UNIX makefile (cc, creates static libpng.a)
+       makefile.elf     =>  Linux/ELF makefile symbol versioning,
+                            gcc, creates libpng10.so.0.1.0.37)
        makefile.linux   =>  Linux/ELF makefile
-                            (gcc, creates libpng12.so.0.1.2.8beta1)
+                            (gcc, creates libpng10.so.0.1.0.37)
        makefile.gcmmx   =>  Linux/ELF makefile
-                            (gcc, creates libpng12.so.0.1.2.8beta1,
+                            (gcc, creates libpng10.so.0.1.0.37,
                             uses assembler code tuned for Intel MMX platform)
        makefile.gcc     =>  Generic makefile (gcc, creates static libpng.a)
        makefile.knr     =>  Archaic UNIX Makefile that converts files with
@@ -209,16 +213,16 @@ Files in this distribution:
        makefile.intel   =>  Intel C/C++ version 4.0 and later
        libpng.icc       =>  Project file, IBM VisualAge/C++ 4.0 or later
        makefile.netbsd  =>  NetBSD/cc makefile, PNGGCCRD, makes libpng.so.
-       makefile.ne12bsd  =>  NetBSD/cc makefile, PNGGCCRD, makes libpng12.so
+       makefile.ne10bsd  =>  NetBSD/cc makefile, PNGGCCRD, makes libpng10.so
        makefile.openbsd =>  OpenBSD makefile
        makefile.sgi     =>  Silicon Graphics IRIX (cc, creates static lib)
        makefile.sggcc   =>  Silicon Graphics
-                            (gcc, creates libpng12.so.0.1.2.8beta1)
+                            (gcc, creates libpng10.so.0.1.0.37)
        makefile.sunos   =>  Sun makefile
        makefile.solaris =>  Solaris 2.X makefile
-                            (gcc, creates libpng12.so.0.1.2.8beta1)
+                            (gcc, creates libpng10.so.0.1.0.37)
        makefile.so9     =>  Solaris 9 makefile
-                            (gcc, creates libpng12.so.0.1.2.8beta1)
+                            (gcc, creates libpng10.so.0.1.0.37)
        makefile.32sunu  =>  Sun Ultra 32-bit makefile
        makefile.64sunu  =>  Sun Ultra 64-bit makefile
        makefile.sco     =>  For SCO OSr5  ELF and Unixware 7 with Native cc
@@ -249,12 +253,12 @@ Files in this distribution:
 Good luck, and happy coding.
 
 -Glenn Randers-Pehrson (current maintainer)
- Internet: glennrp@users.sourceforge.net
+ Internet: glennrp at users.sourceforge.net
 
 -Andreas Eric Dilger (former maintainer, 1996-1997)
- Internet: adilger@enel.ucalgary.ca
- Web: http://www-mddsp.enel.ucalgary.ca/People/adilger/
+ Internet: adilger at enel.ucalgary.ca
+ Web: http://members.shaw.ca/adilger/
 
 -Guy Eric Schalnat (original author and former maintainer, 1995-1996)
  (formerly of Group 42, Inc)
- Internet: gschal@infinet.com
+ Internet: gschal at infinet.com

Y2KINFO

@@ -1,13 +1,13 @@
    Y2K compliance in libpng:
    =========================
 
-      November 1, 2004
+      May 9, 2008
 
       Since the PNG Development group is an ad-hoc body, we can't make
       an official declaration.
 
       This is your unofficial assurance that libpng from version 0.71 and
-      upward through 1.2.8beta1 are Y2K compliant.  It is my belief that earlier
+      upward through 1.0.37 are Y2K compliant.  It is my belief that earlier
       versions were also Y2K compliant.
 
       Libpng only has three year fields.  One is a 2-byte unsigned integer

autogen.sh

@@ -0,0 +1,25 @@
+#! /bin/sh
+# a quick hack script to generate necessary files from 
+# auto* tools.
+#
+# WARNING: if you run this you will change the versions
+# of the tools which are used and, maybe, required!
+        touch Makefile.am configure.ac
+{
+	echo "running libtoolize" >&2
+	libtoolize --force --copy --automake
+} && {
+	echo "running aclocal" >&2
+	aclocal
+} && {
+	echo "running autoheader [ignore the warnings]" >&2
+	autoheader
+} && {
+	echo "running automake" >&2
+	automake --force-missing --foreign -a -c
+} && {
+	echo "running autoconf" >&2
+	autoconf
+} &&
+	echo "autogen complete" >&2 ||
+	echo "ERROR: autogen.sh failed, autogen is incomplete" >&2

config.h.in

@@ -0,0 +1,83 @@
+/* config.h.in.  Generated from configure.ac by autoheader.  */
+
+/* Define to 1 if you have the <dlfcn.h> header file. */
+#undef HAVE_DLFCN_H
+
+/* Define to 1 if you have the <inttypes.h> header file. */
+#undef HAVE_INTTYPES_H
+
+/* Define to 1 if you have the `m' library (-lm). */
+#undef HAVE_LIBM
+
+/* Define to 1 if you have the `z' library (-lz). */
+#undef HAVE_LIBZ
+
+/* Define to 1 if you have the <malloc.h> header file. */
+#undef HAVE_MALLOC_H
+
+/* Define to 1 if you have the <memory.h> header file. */
+#undef HAVE_MEMORY_H
+
+/* Define to 1 if you have the `memset' function. */
+#undef HAVE_MEMSET
+
+/* Define to 1 if you have the `pow' function. */
+#undef HAVE_POW
+
+/* Define to 1 if you have the <stdint.h> header file. */
+#undef HAVE_STDINT_H
+
+/* Define to 1 if you have the <stdlib.h> header file. */
+#undef HAVE_STDLIB_H
+
+/* Define to 1 if you have the <strings.h> header file. */
+#undef HAVE_STRINGS_H
+
+/* Define to 1 if you have the <string.h> header file. */
+#undef HAVE_STRING_H
+
+/* Define to 1 if you have the <sys/stat.h> header file. */
+#undef HAVE_SYS_STAT_H
+
+/* Define to 1 if you have the <sys/types.h> header file. */
+#undef HAVE_SYS_TYPES_H
+
+/* Define to 1 if you have the <unistd.h> header file. */
+#undef HAVE_UNISTD_H
+
+/* Define to the sub-directory in which libtool stores uninstalled libraries.
+   */
+#undef LT_OBJDIR
+
+/* Name of package */
+#undef PACKAGE
+
+/* Define to the address where bug reports for this package should be sent. */
+#undef PACKAGE_BUGREPORT
+
+/* Define to the full name of this package. */
+#undef PACKAGE_NAME
+
+/* Define to the full name and version of this package. */
+#undef PACKAGE_STRING
+
+/* Define to the one symbol short name of this package. */
+#undef PACKAGE_TARNAME
+
+/* Define to the version of this package. */
+#undef PACKAGE_VERSION
+
+/* Define to 1 if you have the ANSI C header files. */
+#undef STDC_HEADERS
+
+/* Define to 1 if your <sys/time.h> declares `struct tm'. */
+#undef TM_IN_SYS_TIME
+
+/* Version number of package */
+#undef VERSION
+
+/* Define to empty if `const' does not conform to ANSI C. */
+#undef const
+
+/* Define to `unsigned int' if <sys/types.h> does not define. */
+#undef size_t

configure.ac

@@ -0,0 +1,148 @@
+# configure.ac
+
+dnl Process this file with autoconf to produce a configure script.
+dnl
+dnl Minor upgrades (compatible ABI): increment the package version
+dnl (third field in two places below) and set the PNGLIB_RELEASE
+dnl variable.
+dnl
+dnl Major upgrades (incompatible ABI): increment the package major
+dnl version (second field, or first if desired), set the minor
+dnl to 0, set PNGLIB_MAJOR below *and* follow the instructions in
+dnl Makefile.am to upgrade the package name.
+
+dnl This is here to prevent earlier autoconf from being used, it
+dnl should not be necessary to regenerate configure if the time
+dnl stamps are correct
+AC_PREREQ(2.59)
+
+dnl Version number stuff here:
+
+AC_INIT([libpng], [1.0.37], [png-mng-implement@lists.sourceforge.net])
+AM_INIT_AUTOMAKE
+dnl stop configure from automagically running automake
+AM_MAINTAINER_MODE
+
+PNGLIB_VERSION=1.0.37
+PNGLIB_MAJOR=1
+PNGLIB_MINOR=0
+PNGLIB_RELEASE=37
+
+dnl End of version number stuff
+
+AC_CONFIG_SRCDIR([pngget.c])
+AM_CONFIG_HEADER(config.h)
+
+# Checks for programs.
+AC_PROG_CC
+AC_PROG_LD
+AC_PROG_CPP
+AC_CHECK_TOOL(SED, sed, :)
+AC_LIBTOOL_WIN32_DLL
+AC_PROG_INSTALL
+AC_PROG_LN_S
+AC_PROG_MAKE_SET
+AC_PROG_LIBTOOL
+
+# Checks for header files.
+AC_HEADER_STDC
+AC_CHECK_HEADERS([malloc.h stdlib.h string.h strings.h])
+
+# Checks for typedefs, structures, and compiler characteristics.
+AC_C_CONST
+AC_TYPE_SIZE_T
+AC_STRUCT_TM
+
+# Checks for library functions.
+AC_FUNC_STRTOD
+AC_CHECK_FUNCS([memset], , AC_ERROR([memset not found in libc]))
+AC_CHECK_FUNCS([pow], , AC_CHECK_LIB(m, pow, , AC_ERROR([cannot find pow])) )
+AC_CHECK_LIB(z, zlibVersion, , AC_ERROR([zlib not installed]))
+
+LIBPNG_DEFINES=-DPNG_CONFIGURE_LIBPNG
+AC_MSG_CHECKING(
+  [if assembler code in pnggccrd.c can be compiled without PNG_NO_MMX_CODE])
+AC_TRY_COMPILE(
+  [#include "$srcdir/pnggccrd.c"],
+  [return 0;],
+  AC_MSG_RESULT(yes)
+  LIBPNG_NO_MMX="",
+  AC_MSG_RESULT(no)
+  LIBPNG_NO_MMX=-DPNG_NO_MMX_CODE)
+LIBPNG_DEFINES=$LIBPNG_DEFINES\ $LIBPNG_NO_MMX
+AC_SUBST(LIBPNG_DEFINES)
+AC_SUBST(LIBPNG_NO_MMX)
+
+AC_MSG_CHECKING([if libraries can be versioned])
+GLD=`$LD --help < /dev/null 2>/dev/null | grep version-script`
+if test "$GLD"; then
+    have_ld_version_script=yes
+    AC_MSG_RESULT(yes)
+else
+    have_ld_version_script=no
+    AC_MSG_RESULT(no)
+    AC_MSG_WARN(*** You have not enabled versioned symbols.)
+fi
+AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes")
+
+if test "$have_ld_version_script" = "yes"; then
+    AC_MSG_CHECKING([for symbol prefix])
+    SYMBOL_PREFIX=`echo "PREFIX=__USER_LABEL_PREFIX__" \
+                   | ${CPP-${CC-gcc} -E} - 2>&1 \
+                   | ${EGREP-grep} "^PREFIX=" \
+                   | ${SED-sed} "s:^PREFIX=::"`
+    AC_SUBST(SYMBOL_PREFIX)
+    AC_MSG_RESULT($SYMBOL_PREFIX)
+fi
+
+# Substitutions for .in files
+AC_SUBST(PNGLIB_VERSION)
+AC_SUBST(PNGLIB_MAJOR)
+AC_SUBST(PNGLIB_MINOR)
+AC_SUBST(PNGLIB_RELEASE)
+
+# Additional arguments (and substitutions)
+# Allow the pkg-config directory to be set
+AC_ARG_WITH(pkgconfigdir,
+	AC_HELP_STRING([--with-pkgconfigdir],
+	[Use the specified pkgconfig dir (default is libdir/pkgconfig)]),
+	[pkgconfigdir=${withval}],
+	[pkgconfigdir='${libdir}/pkgconfig'])
+
+AC_SUBST([pkgconfigdir])
+AC_MSG_NOTICE([pkgconfig directory is ${pkgconfigdir}])
+
+# Make the *-config binary config scripts optional
+AC_ARG_WITH(binconfigs,
+	AC_HELP_STRING([--with-binconfigs],
+		[Generate shell libpng-config scripts as well as pkg-config data]
+		[@<:@default=yes@:>@]),
+	[if test "${withval}" = no; then
+		binconfigs=
+		AC_MSG_NOTICE([libpng-config scripts will not be built])
+	else
+		binconfigs='${binconfigs}'
+	fi],
+	[binconfigs='${binconfigs}'])
+AC_SUBST([binconfigs])
+
+# Allow the old version number library, libpng.so, to be removed from
+# the build
+AC_ARG_WITH(libpng-compat,
+	AC_HELP_STRING([--with-libpng-compat],
+		[Generate the obsolete libpng.so library @<:@default=yes@:>@]),
+	[if test "${withval}" = no; then
+		compatlib=
+		AC_MSG_NOTICE([libpng.so will not be built])
+	else
+		compatlib=libpng.la
+	fi],
+	[compatlib=libpng.la])
+AC_SUBST([compatlib])
+
+# Config files, substituting as above
+AC_CONFIG_FILES([Makefile libpng.pc:scripts/libpng.pc-configure.in])
+AC_CONFIG_FILES([libpng-config:scripts/libpng-config.in],
+		[chmod +x libpng-config])
+
+AC_OUTPUT

contrib/gregbook/COPYING

@@ -0,0 +1,340 @@
+		    GNU GENERAL PUBLIC LICENSE
+		       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+     59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+			    Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Library General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+  To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have.  You must make sure that they, too, receive or can get the
+source code.  And you must show them these terms so they know their
+rights.
+
+  We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+  Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software.  If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
+authors' reputations.
+
+  Finally, any free program is threatened constantly by software
+patents.  We wish to avoid the danger that redistributors of a free
+program will individually obtain patent licenses, in effect making the
+program proprietary.  To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+		    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License.  The "Program", below,
+refers to any such program or work, and a "work based on the Program"
+means either the Program or any derivative work under copyright law:
+that is to say, a work containing the Program or a portion of it,
+either verbatim or with modifications and/or translated into another
+language.  (Hereinafter, translation is included without limitation in
+the term "modification".)  Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope.  The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+  1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+  2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+    a) You must cause the modified files to carry prominent notices
+    stating that you changed the files and the date of any change.
+
+    b) You must cause any work that you distribute or publish, that in
+    whole or in part contains or is derived from the Program or any
+    part thereof, to be licensed as a whole at no charge to all third
+    parties under the terms of this License.
+
+    c) If the modified program normally reads commands interactively
+    when run, you must cause it, when started running for such
+    interactive use in the most ordinary way, to print or display an
+    announcement including an appropriate copyright notice and a
+    notice that there is no warranty (or else, saying that you provide
+    a warranty) and that users may redistribute the program under
+    these conditions, and telling the user how to view a copy of this
+    License.  (Exception: if the Program itself is interactive but
+    does not normally print such an announcement, your work based on
+    the Program is not required to print an announcement.)
+
+These requirements apply to the modified work as a whole.  If
+identifiable sections of that work are not derived from the Program,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works.  But when you
+distribute the same sections as part of a whole which is a work based
+on the Program, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote it.
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
+collective works based on the Program.
+
+In addition, mere aggregation of another work not based on the Program
+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+  3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
+
+    a) Accompany it with the complete corresponding machine-readable
+    source code, which must be distributed under the terms of Sections
+    1 and 2 above on a medium customarily used for software interchange; or,
+
+    b) Accompany it with a written offer, valid for at least three
+    years, to give any third party, for a charge no more than your
+    cost of physically performing source distribution, a complete
+    machine-readable copy of the corresponding source code, to be
+    distributed under the terms of Sections 1 and 2 above on a medium
+    customarily used for software interchange; or,
+
+    c) Accompany it with the information you received as to the offer
+    to distribute corresponding source code.  (This alternative is
+    allowed only for noncommercial distribution and only if you
+    received the program in object code or executable form with such
+    an offer, in accord with Subsection b above.)
+
+The source code for a work means the preferred form of the work for
+making modifications to it.  For an executable work, complete source
+code means all the source code for all modules it contains, plus any
+associated interface definition files, plus the scripts used to
+control compilation and installation of the executable.  However, as a
+special exception, the source code distributed need not include
+anything that is normally distributed (in either source or binary
+form) with the major components (compiler, kernel, and so on) of the
+operating system on which the executable runs, unless that component
+itself accompanies the executable.
+
+If distribution of executable or object code is made by offering
+access to copy from a designated place, then offering equivalent
+access to copy the source code from the same place counts as
+distribution of the source code, even though third parties are not
+compelled to copy the source along with the object code.
+
+  4. You may not copy, modify, sublicense, or distribute the Program
+except as expressly provided under this License.  Any attempt
+otherwise to copy, modify, sublicense or distribute the Program is
+void, and will automatically terminate your rights under this License.
+However, parties who have received copies, or rights, from you under
+this License will not have their licenses terminated so long as such
+parties remain in full compliance.
+
+  5. You are not required to accept this License, since you have not
+signed it.  However, nothing else grants you permission to modify or
+distribute the Program or its derivative works.  These actions are
+prohibited by law if you do not accept this License.  Therefore, by
+modifying or distributing the Program (or any work based on the
+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
+the Program or works based on it.
+
+  6. Each time you redistribute the Program (or any work based on the
+Program), the recipient automatically receives a license from the
+original licensor to copy, distribute or modify the Program subject to
+these terms and conditions.  You may not impose any further
+restrictions on the recipients' exercise of the rights granted herein.
+You are not responsible for enforcing compliance by third parties to
+this License.
+
+  7. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
+conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot
+distribute so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you
+may not distribute the Program at all.  For example, if a patent
+license would not permit royalty-free redistribution of the Program by
+all those who receive copies directly or indirectly through you, then
+the only way you could satisfy both it and this License would be to
+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
+any particular circumstance, the balance of the section is intended to
+apply and the section as a whole is intended to apply in other
+circumstances.
+
+It is not the purpose of this section to induce you to infringe any
+patents or other property right claims or to contest validity of any
+such claims; this section has the sole purpose of protecting the
+integrity of the free software distribution system, which is
+implemented by public license practices.  Many people have made
+generous contributions to the wide range of software distributed
+through that system in reliance on consistent application of that
+system; it is up to the author/donor to decide if he or she is willing
+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+  8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
+those countries, so that distribution is permitted only in or among
+countries not thus excluded.  In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+  9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number.  If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation.  If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+  10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission.  For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this.  Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+			    NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+		     END OF TERMS AND CONDITIONS
+
+	    How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year  name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Library General
+Public License instead of this License.

contrib/gregbook/LICENSE

@@ -1,12 +1,19 @@
   ---------------------------------------------------------------------------
 
-      Copyright (c) 1998-2001 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2008 Greg Roelofs.  All rights reserved.
 
       This software is provided "as is," without warranty of any kind,
       express or implied.  In no event shall the author or contributors
       be held liable for any damages arising in any way from the use of
       this software.
 
+      The contents of this file are DUAL-LICENSED.  You may modify and/or
+      redistribute this software according to the terms of one of the
+      following two licenses (at your option):
+
+
+      LICENSE 1 ("BSD-like with advertising clause"):
+
       Permission is granted to anyone to use this software for any purpose,
       including commercial applications, and to alter it and redistribute
       it freely, subject to the following restrictions:
@@ -23,4 +30,21 @@
             and contributors for the book, "PNG: The Definitive Guide,"
             published by O'Reilly and Associates.
 
+
+      LICENSE 2 (GNU GPL v2 or later):
+
+      This program is free software; you can redistribute it and/or modify
+      it under the terms of the GNU General Public License as published by
+      the Free Software Foundation; either version 2 of the License, or
+      (at your option) any later version.
+
+      This program is distributed in the hope that it will be useful,
+      but WITHOUT ANY WARRANTY; without even the implied warranty of
+      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+      GNU General Public License for more details.
+
+      You should have received a copy of the GNU General Public License
+      along with this program; if not, write to the Free Software Foundation,
+      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
   ---------------------------------------------------------------------------

contrib/gregbook/Makefile.mingw32

@@ -0,0 +1,130 @@
+# Sample makefile for rpng-win / rpng2-win / wpng using mingw32-gcc and make.
+# Greg Roelofs
+# Last modified:  2 June 2007
+#
+#	The programs built by this makefile are described in the book,
+#	"PNG:  The Definitive Guide," by Greg Roelofs (O'Reilly and
+#	Associates, 1999).  Go buy a copy, eh?  Well, OK, it's not
+#	generally for sale anymore, but it's the thought that counts,
+#	right?  (Hint:  http://www.libpng.org/pub/png/book/ )
+#
+# Invoke this makefile from a DOS-prompt window via:
+#
+#	make -f Makefile.mingw32
+#
+# This makefile assumes libpng and zlib have already been built or downloaded
+# and are in subdirectories at the same level as the current subdirectory
+# (as indicated by the PNGDIR and ZDIR macros below).  It makes no assumptions
+# at all about the mingw32 installation tree (W32DIR).  Edit as appropriate.
+#
+# Note that the names of the dynamic and static libpng and zlib libraries
+# used below may change in later releases of the libraries.  This makefile
+# builds both statically and dynamically linked executables by default.
+# (You need only one set, but for testing it can be handy to have both.)
+
+
+# macros --------------------------------------------------------------------
+
+#PNGDIR = ../..#		for libpng-x.y.z/contrib/gregbook builds
+PNGDIR = ../libpng-win32
+PNGINC = -I$(PNGDIR)
+PNGLIBd = $(PNGDIR)/libpng.dll.a	# dynamically linked
+PNGLIBs = $(PNGDIR)/libpng.a		# statically linked, local libpng
+
+#ZDIR = ../../../zlib-win32#	for libpng-x.y.z/contrib/gregbook builds
+ZDIR = ../zlib-win32
+ZINC = -I$(ZDIR)
+ZLIBd = $(ZDIR)/libzdll.a
+ZLIBs = $(ZDIR)/libz.a
+
+# change this to be the path where mingw32 installs its stuff:
+W32DIR =
+#W32DIR = /usr/local/cross-tools/i386-mingw32msvc
+W32INC = -I$(W32DIR)/include
+W32LIB = $(W32DIR)/lib/libuser32.a $(W32DIR)/lib/libgdi32.a
+
+CC = gcc
+#CC = i386-mingw32msvc-gcc #	e.g., Linux -> Win32 cross-compilation
+LD = $(CC)
+RM = rm -f
+CFLAGS = -O -Wall $(INCS) $(MINGW_CCFLAGS)
+# [note that -Wall is a gcc-specific compilation flag ("most warnings on")]
+# [-ansi, -pedantic and -W can also be used]
+LDFLAGS = $(MINGW_LDFLAGS)
+O = .o
+E = .exe
+
+INCS = $(PNGINC) $(ZINC) $(W32INC)
+RLIBSd = $(PNGLIBd) $(ZLIBd) $(W32LIB) -lm
+RLIBSs = $(PNGLIBs) $(ZLIBs) $(W32LIB) -lm
+WLIBSd = $(PNGLIBd) $(ZLIBd)
+WLIBSs = $(PNGLIBs) $(ZLIBs)
+
+RPNG   = rpng-win
+RPNG2  = rpng2-win
+WPNG   = wpng
+
+ROBJSd  = $(RPNG)$(O) readpng.pic$(O)
+ROBJS2d = $(RPNG2)$(O) readpng2.pic$(O)
+WOBJSd  = $(WPNG)$(O) writepng.pic$(O)
+
+RPNGs  = $(RPNG)-static
+RPNG2s = $(RPNG2)-static
+WPNGs  = $(WPNG)-static
+
+ROBJSs  = $(RPNG)$(O) readpng$(O)
+ROBJS2s = $(RPNG2)$(O) readpng2$(O)
+WOBJSs  = $(WPNG)$(O) writepng$(O)
+
+STATIC_EXES  = $(RPNGs)$(E) $(RPNG2s)$(E) $(WPNGs)$(E)
+DYNAMIC_EXES = $(RPNG)$(E) $(RPNG2)$(E) $(WPNG)$(E)
+
+EXES = $(STATIC_EXES) $(DYNAMIC_EXES)
+
+
+# implicit make rules -------------------------------------------------------
+
+.c$(O):
+	$(CC) -c $(CFLAGS) $<
+
+%.pic$(O): %.c
+	$(CC) -c $(CFLAGS) -DPNG_BUILD_DLL -o $@ $<
+
+
+# dependencies --------------------------------------------------------------
+
+all:  $(EXES)
+
+$(RPNGs)$(E): $(ROBJSs)
+	$(LD) $(LDFLAGS) -o $@ $(ROBJSs) $(RLIBSs)
+
+$(RPNG)$(E): $(ROBJSd)
+	$(LD) $(LDFLAGS) -o $@ $(ROBJSd) $(RLIBSd)
+
+$(RPNG2s)$(E): $(ROBJS2s)
+	$(LD) $(LDFLAGS) -o $@ $(ROBJS2s) $(RLIBSs)
+
+$(RPNG2)$(E): $(ROBJS2d)
+	$(LD) $(LDFLAGS) -o $@ $(ROBJS2d) $(RLIBSd)
+
+$(WPNGs)$(E): $(WOBJSs)
+	$(LD) $(LDFLAGS) -o $@ $(WOBJSs) $(WLIBSs)
+
+$(WPNG)$(E): $(WOBJSd)
+	$(LD) $(LDFLAGS) -o $@ $(WOBJSd) $(WLIBSd)
+
+$(RPNG)$(O):	$(RPNG).c readpng.h
+$(RPNG2)$(O):	$(RPNG2).c readpng2.h
+$(WPNG)$(O):	$(WPNG).c writepng.h
+
+readpng$(O) readpng.pic$(O):	readpng.c readpng.h
+readpng2$(O) readpng2.pic$(O):	readpng2.c readpng2.h
+writepng$(O) writepng.pic$(O):	writepng.c writepng.h
+
+
+# maintenance ---------------------------------------------------------------
+
+clean:
+	$(RM) $(EXES)
+	$(RM) $(ROBJSs) $(ROBJS2s) $(WOBJSs)
+	$(RM) $(ROBJSd) $(ROBJS2d) $(WOBJSd)

contrib/gregbook/Makefile.unx

@@ -1,73 +1,92 @@
 # Sample makefile for rpng-x / rpng2-x / wpng using gcc and make.
 # Greg Roelofs
-# Last modified:  7 March 2002
+# Last modified:  2 June 2007
 #
 #	The programs built by this makefile are described in the book,
 #	"PNG:  The Definitive Guide," by Greg Roelofs (O'Reilly and
-#	Associates, 1999).  Go buy a copy, eh?  Buy some for friends
-#	and family, too.  (Not that this is a blatant plug or anything.)
+#	Associates, 1999).  Go buy a copy, eh?  Well, OK, it's not
+#	generally for sale anymore, but it's the thought that counts,
+#	right?  (Hint:  http://www.libpng.org/pub/png/book/ )
 #
 # Invoke this makefile from a shell prompt in the usual way; for example:
 #
 #	make -f Makefile.unx
 #
 # This makefile assumes libpng and zlib have already been built or downloaded
-# and are both installed in /usr/local/{include,lib} (as indicated by the
-# PNG* and Z* macros below).  Edit as appropriate--choose only ONE each of
-# the PNGINC, PNGLIB, ZINC and ZLIB lines.
+# and are installed in /usr/local/{include,lib} or as otherwise indicated by
+# the PNG* and Z* macros below.  Edit as appropriate--choose only ONE each of
+# the PNGINC, PNGLIBd, PNGLIBs, ZINC, ZLIBd and ZLIBs lines.
 #
-# This makefile builds statically linked executables (against libpng and zlib,
-# that is), but that can be changed by uncommenting the appropriate PNGLIB and
-# ZLIB lines.
+# This makefile builds both dynamically and statically linked executables
+# (against libpng and zlib, that is), but that can be changed by modifying
+# the "EXES =" line.  (You need only one set, but for testing it can be handy
+# to have both.)
 
 
 # macros --------------------------------------------------------------------
 
-PNGINC = -I/usr/local/include/libpng12
-#PNGLIB = -L/usr/local/lib -lpng12 # dynamically linked against libpng
-PNGLIB = /usr/local/lib/libpng12.a # statically linked against libpng
+#PNGDIR = /usr/local/lib
+#PNGINC = -I/usr/local/include/libpng12
+#PNGLIBd = -L$(PNGDIR) -lpng12 # dynamically linked, installed libpng
+#PNGLIBs = $(PNGDIR)/libpng12.a # statically linked, installed libpng
 # or:
-#PNGINC = -I../libpng
-#PNGLIB = -L../libpng -lpng
-#PNGLIB = ../libpng/libpng.a
+PNGDIR = ../..#	this one is for libpng-x.y.z/contrib/gregbook builds
+#PNGDIR = ../libpng
+PNGINC = -I$(PNGDIR)
+PNGLIBd = -Wl,-rpath,$(PNGDIR) -L$(PNGDIR) -lpng12	# dynamically linked
+PNGLIBs = $(PNGDIR)/libpng.a		# statically linked, local libpng
 
+ZDIR = /usr/local/lib
+#ZDIR = /usr/lib64
 ZINC = -I/usr/local/include
-#ZLIB = -L/usr/local/lib -lz		# dynamically linked against zlib
-ZLIB = /usr/local/lib/libz.a		# statically linked against zlib
-#ZINC = -I../zlib
-#ZLIB = -L../zlib -lz
-#ZLIB = ../zlib/libz.a
+ZLIBd = -L$(ZDIR) -lz			# dynamically linked against zlib
+ZLIBs = $(ZDIR)/libz.a			# statically linked against zlib
+# or:
+#ZDIR = ../zlib
+#ZINC = -I$(ZDIR)
+#ZLIBd = -Wl,-rpath,$(ZDIR) -L$(ZDIR) -lz  # -rpath allows in-place testing
+#ZLIBs = $(ZDIR)/libz.a
 
 #XINC = -I/usr/include			# old-style, stock X distributions
-#XLIB = -L/usr/lib/X11 -lX11
+#XLIB = -L/usr/lib/X11 -lX11		#  (including SGI IRIX)
 #XINC = -I/usr/openwin/include		# Sun workstations (OpenWindows)
 #XLIB = -L/usr/openwin/lib -lX11
-XINC = -I/usr/X11R6/include		# new X distributions (XFree86, etc.)
+XINC = -I/usr/X11R6/include		# new X distributions (X.org, etc.)
 XLIB = -L/usr/X11R6/lib -lX11
+#XLIB = -L/usr/X11R6/lib64 -lX11	# e.g., Red Hat on AMD64
 
 INCS = $(PNGINC) $(ZINC) $(XINC)
-RLIBS = $(PNGLIB) $(ZLIB) $(XLIB) -lm
-WLIBS = $(PNGLIB) $(ZLIB)
+RLIBSd = $(PNGLIBd) $(ZLIBd) $(XLIB) -lm
+RLIBSs = $(PNGLIBs) $(ZLIBs) $(XLIB) -lm
+WLIBSd = $(PNGLIBd) $(ZLIBd) -lm
+WLIBSs = $(PNGLIBs) $(ZLIBs)
 
 CC = gcc
 LD = gcc
 RM = rm -f
-CFLAGS = -O -Wall $(INCS)
+CFLAGS = -O -Wall $(INCS) -DFEATURE_LOOP
 # [note that -Wall is a gcc-specific compilation flag ("most warnings on")]
 # [-ansi, -pedantic and -W can also be used]
 LDFLAGS =
 O = .o
 E =
 
-RPNG  = rpng-x
-RPNG2 = rpng2-x
-WPNG  = wpng
+RPNG   = rpng-x
+RPNG2  = rpng2-x
+WPNG   = wpng
+
+RPNGs  = $(RPNG)-static
+RPNG2s = $(RPNG2)-static
+WPNGs  = $(WPNG)-static
 
 ROBJS  = $(RPNG)$(O) readpng$(O)
 ROBJS2 = $(RPNG2)$(O) readpng2$(O)
 WOBJS  = $(WPNG)$(O) writepng$(O)
 
-EXES = $(RPNG)$(E) $(RPNG2)$(E) $(WPNG)$(E)
+STATIC_EXES  = $(RPNGs)$(E) $(RPNG2s)$(E) $(WPNGs)$(E)
+DYNAMIC_EXES = $(RPNG)$(E) $(RPNG2)$(E) $(WPNG)$(E)
+
+EXES = $(STATIC_EXES) $(DYNAMIC_EXES)
 
 
 # implicit make rules -------------------------------------------------------
@@ -80,14 +99,23 @@ EXES = $(RPNG)$(E) $(RPNG2)$(E) $(WPNG)$(E)
 
 all:  $(EXES)
 
+$(RPNGs)$(E): $(ROBJS)
+	$(LD) $(LDFLAGS) -o $@ $(ROBJS) $(RLIBSs)
+
 $(RPNG)$(E): $(ROBJS)
-	$(LD) $(LDFLAGS) -o $@ $(ROBJS) $(RLIBS)
+	$(LD) $(LDFLAGS) -o $@ $(ROBJS) $(RLIBSd)
+
+$(RPNG2s)$(E): $(ROBJS2)
+	$(LD) $(LDFLAGS) -o $@ $(ROBJS2) $(RLIBSs)
 
 $(RPNG2)$(E): $(ROBJS2)
-	$(LD) $(LDFLAGS) -o $@ $(ROBJS2) $(RLIBS)
+	$(LD) $(LDFLAGS) -o $@ $(ROBJS2) $(RLIBSd)
+
+$(WPNGs)$(E): $(WOBJS)
+	$(LD) $(LDFLAGS) -o $@ $(WOBJS) $(WLIBSs)
 
 $(WPNG)$(E): $(WOBJS)
-	$(LD) $(LDFLAGS) -o $@ $(WOBJS) $(WLIBS)
+	$(LD) $(LDFLAGS) -o $@ $(WOBJS) $(WLIBSd)
 
 $(RPNG)$(O):	$(RPNG).c readpng.h
 $(RPNG2)$(O):	$(RPNG2).c readpng2.h

contrib/gregbook/Makefile.w32

@@ -1,11 +1,12 @@
 # Sample makefile for rpng-win / rpng2-win / wpng using MSVC and NMAKE.
 # Greg Roelofs
-# Last modified:  16 February 1999
+# Last modified:  2 June 2007
 #
 #	The programs built by this makefile are described in the book,
 #	"PNG:  The Definitive Guide," by Greg Roelofs (O'Reilly and
-#	Associates, 1999).  Go buy a copy, eh?  Buy some for friends
-#	and family, too.  (Not that this is a blatant plug or anything.)
+#	Associates, 1999).  Go buy a copy, eh?  Well, OK, it's not
+#	generally for sale anymore, but it's the thought that counts,
+#	right?  (Hint:  http://www.libpng.org/pub/png/book/ )
 #
 # Invoke this makefile from a DOS prompt window via:
 #
@@ -53,7 +54,7 @@ CC = cl
 LD = link
 RM = del
 CFLAGS = -nologo -O -W3 $(INCS) $(cvars)
-# [note that -Wall is an MSVC-specific compilation flag ("all warnings on")]
+# [note that -W3 is an MSVC-specific compilation flag ("all warnings on")]
 # [see %devstudio%\vc\include\win32.mak for cvars macro definition]
 O = .obj
 E = .exe

contrib/gregbook/README

@@ -22,7 +22,8 @@ below.
 Files:
 
    README             this file
-   LICENSE            terms of distribution and reuse (BSD-like)
+   LICENSE            terms of distribution and reuse (BSD-like or GNU GPL)
+   COPYING            GNU General Public License (GPL)
 
    Makefile.unx       Unix makefile
    Makefile.w32       Windows (MSVC) makefile
@@ -54,15 +55,15 @@ mation and links to the latest version of the source code, and Chapters
 13-15 of the book for detailed discussion of the three programs.
 
 Greg Roelofs
-newt@pobox.com
-30 June 2001
+http://pobox.com/~newt/greg_contact.html
+16 March 2008
 
 
 BUILD INSTRUCTIONS
 
  - Prerequisites (in order of compilation):
 
-      - zlib		http://www.gzip.org/zlib/
+      - zlib		http://zlib.net/
       - libpng		http://www.libpng.org/pub/png/libpng.html
       - pngbook		http://www.libpng.org/pub/png/book/sources.html
 
@@ -150,9 +151,9 @@ BUILD INSTRUCTIONS
      To run the programs, they probably first need to be set up as "foreign
      symbols," with "disk" and "dir" set appropriately:
 
-     $ rpng == "$disk:[dir]rpng-x.exe"
+     $ rpng  == "$disk:[dir]rpng-x.exe"
      $ rpng2 == "$disk:[dir]rpng2-x.exe"
-     $ wpng == "$disk:[dir]wpng.exe"
+     $ wpng  == "$disk:[dir]wpng.exe"
 
      All three will print a basic usage screen when run without any command-
      line arguments; see the book for more details.  Note that the options
@@ -176,7 +177,7 @@ RUNNING THE PROGRAMS:  (VERY) BRIEF INTRO
      wpng is a purely command-line image converter from binary PBMPLUS/NetPBM
      format (.pgm or .ppm) to PNG; for example,
 
-	wpng -time < toucan.ppm > toucan.png
+	wpng -time < toucan-notrans.ppm > toucan-notrans.png
 
      would convert the specified PPM file (using redirection) to PNG, auto-
      matically setting the PNG modification-time chunk.

contrib/gregbook/readpng.c

@@ -4,13 +4,20 @@
 
   ---------------------------------------------------------------------------
 
-      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
 
       This software is provided "as is," without warranty of any kind,
       express or implied.  In no event shall the author or contributors
       be held liable for any damages arising in any way from the use of
       this software.
 
+      The contents of this file are DUAL-LICENSED.  You may modify and/or
+      redistribute this software according to the terms of one of the
+      following two licenses (at your option):
+
+
+      LICENSE 1 ("BSD-like with advertising clause"):
+
       Permission is granted to anyone to use this software for any purpose,
       including commercial applications, and to alter it and redistribute
       it freely, subject to the following restrictions:
@@ -27,6 +34,23 @@
             and contributors for the book, "PNG: The Definitive Guide,"
             published by O'Reilly and Associates.
 
+
+      LICENSE 2 (GNU GPL v2 or later):
+
+      This program is free software; you can redistribute it and/or modify
+      it under the terms of the GNU General Public License as published by
+      the Free Software Foundation; either version 2 of the License, or
+      (at your option) any later version.
+
+      This program is distributed in the hope that it will be useful,
+      but WITHOUT ANY WARRANTY; without even the implied warranty of
+      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+      GNU General Public License for more details.
+
+      You should have received a copy of the GNU General Public License
+      along with this program; if not, write to the Free Software Foundation,
+      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
   ---------------------------------------------------------------------------*/
 
 #include <stdio.h>

contrib/gregbook/readpng.h

@@ -4,13 +4,20 @@
 
   ---------------------------------------------------------------------------
 
-      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
 
       This software is provided "as is," without warranty of any kind,
       express or implied.  In no event shall the author or contributors
       be held liable for any damages arising in any way from the use of
       this software.
 
+      The contents of this file are DUAL-LICENSED.  You may modify and/or
+      redistribute this software according to the terms of one of the
+      following two licenses (at your option):
+
+
+      LICENSE 1 ("BSD-like with advertising clause"):
+
       Permission is granted to anyone to use this software for any purpose,
       including commercial applications, and to alter it and redistribute
       it freely, subject to the following restrictions:
@@ -27,6 +34,23 @@
             and contributors for the book, "PNG: The Definitive Guide,"
             published by O'Reilly and Associates.
 
+
+      LICENSE 2 (GNU GPL v2 or later):
+
+      This program is free software; you can redistribute it and/or modify
+      it under the terms of the GNU General Public License as published by
+      the Free Software Foundation; either version 2 of the License, or
+      (at your option) any later version.
+
+      This program is distributed in the hope that it will be useful,
+      but WITHOUT ANY WARRANTY; without even the implied warranty of
+      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+      GNU General Public License for more details.
+
+      You should have received a copy of the GNU General Public License
+      along with this program; if not, write to the Free Software Foundation,
+      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
   ---------------------------------------------------------------------------*/
 
 #ifndef TRUE

contrib/gregbook/readpng2.c

@@ -4,19 +4,20 @@
 
   ---------------------------------------------------------------------------
 
-   Changelog:
-    - 1.01:  initial public release
-    - 1.02:  added code to skip unused chunks (GR-P)
-
-  ---------------------------------------------------------------------------
-
-      Copyright (c) 1998-2002 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
 
       This software is provided "as is," without warranty of any kind,
       express or implied.  In no event shall the author or contributors
       be held liable for any damages arising in any way from the use of
       this software.
 
+      The contents of this file are DUAL-LICENSED.  You may modify and/or
+      redistribute this software according to the terms of one of the
+      following two licenses (at your option):
+
+
+      LICENSE 1 ("BSD-like with advertising clause"):
+
       Permission is granted to anyone to use this software for any purpose,
       including commercial applications, and to alter it and redistribute
       it freely, subject to the following restrictions:
@@ -33,6 +34,23 @@
             and contributors for the book, "PNG: The Definitive Guide,"
             published by O'Reilly and Associates.
 
+
+      LICENSE 2 (GNU GPL v2 or later):
+
+      This program is free software; you can redistribute it and/or modify
+      it under the terms of the GNU General Public License as published by
+      the Free Software Foundation; either version 2 of the License, or
+      (at your option) any later version.
+
+      This program is distributed in the hope that it will be useful,
+      but WITHOUT ANY WARRANTY; without even the implied warranty of
+      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+      GNU General Public License for more details.
+
+      You should have received a copy of the GNU General Public License
+      along with this program; if not, write to the Free Software Foundation,
+      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
   ---------------------------------------------------------------------------*/
 
 
@@ -56,7 +74,7 @@ static void readpng2_error_handler(png_structp png_ptr, png_const_charp msg);
 void readpng2_version_info(void)
 {
 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) && \
-    (defined(__i386__) || defined(_M_IX86)) && \
+    (defined(__i386__) || defined(_M_IX86) || defined(__x86_64__)) && \
     defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
     /*
      * WARNING:  This preprocessor approach means that the following code
@@ -79,7 +97,12 @@ void readpng2_version_info(void)
               "with MMX support\n   (%s version).", PNG_LIBPNG_VER_STRING,
               png_libpng_ver, compilerID == 1? "MSVC++" :
               (compilerID == 2? "GNU C" : "unknown"));
-            fprintf(stderr, "  Processor %s MMX instructions.\n",
+            fprintf(stderr, "  Processor (x86%s) %s MMX instructions.\n",
+#if defined(__x86_64__)
+              "_64",
+#else
+              "",
+#endif
               mmxsupport? "supports" : "does not support");
             if (mmxsupport > 0) {
                 int num_optims = 0;
@@ -179,40 +202,38 @@ int readpng2_init(mainprog_info *mainprog_ptr)
         return 2;
     }
 
-    /* prepare the reader to ignore all recognized chunks whose data isn't
-     * going to be used, i.e., all chunks recognized by libpng except for
-     * IHDR, PLTE, IDAT, IEND, tRNS, bKGD, gAMA, and sRGB : */
 
-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
+    /* prepare the reader to ignore all recognized chunks whose data won't be
+     * used, i.e., all chunks recognized by libpng except for IHDR, PLTE, IDAT,
+     * IEND, tRNS, bKGD, gAMA, and sRGB (small performance improvement) */
     {
-#ifndef HANDLE_CHUNK_NEVER
-/* prior to libpng-1.2.5, this macro was internal, so we define it here. */
-# define HANDLE_CHUNK_NEVER 1
-#endif
-       /* these byte strings were copied from png.h.
-        * If a future libpng version recognizes more chunks, add them
-        * to this list.  If a future version of readpng2.c recognizes
-        * more chunks, delete them from this list. */
-       png_byte png_chunk_types_to_ignore[]=
-          { 99,  72,  82,  77, '\0', /* cHRM */
-           104,  73,  83,  84, '\0', /* hIST */
-           105,  67,  67,  80, '\0', /* iCCP */
-           105,  84,  88, 116, '\0', /* iTXt */
-           111,  70,  70, 115, '\0', /* oFFs */
-           112,  67,  65,  76, '\0', /* pCAL */
-           115,  67,  65,  76, '\0', /* sCAL */
-           112,  72,  89, 115, '\0', /* pHYs */
-           115,  66,  73,  84, '\0', /* sBIT */
-           115,  80,  76,  84, '\0', /* sPLT */
-           116,  69,  88, 116, '\0', /* tEXt */
-           116,  73,  77,  69, '\0', /* tIME */
-           122,  84,  88, 116, '\0'}; /* zTXt */
-#define NUM_PNG_CHUNK_TYPES_TO_IGNORE 13
+        /* These byte strings were copied from png.h.  If a future libpng
+         * version recognizes more chunks, add them to this list.  If a
+         * future version of readpng2.c recognizes more chunks, delete them
+         * from this list. */
+        static const png_byte chunks_to_ignore[] = {
+             99,  72,  82,  77, '\0',  /* cHRM */
+            104,  73,  83,  84, '\0',  /* hIST */
+            105,  67,  67,  80, '\0',  /* iCCP */
+            105,  84,  88, 116, '\0',  /* iTXt */
+            111,  70,  70, 115, '\0',  /* oFFs */
+            112,  67,  65,  76, '\0',  /* pCAL */
+            112,  72,  89, 115, '\0',  /* pHYs */
+            115,  66,  73,  84, '\0',  /* sBIT */
+            115,  67,  65,  76, '\0',  /* sCAL */
+            115,  80,  76,  84, '\0',  /* sPLT */
+            115,  84,  69,  82, '\0',  /* sTER */
+            116,  69,  88, 116, '\0',  /* tEXt */
+            116,  73,  77,  69, '\0',  /* tIME */
+            122,  84,  88, 116, '\0'   /* zTXt */
+        };
 
-    png_set_keep_unknown_chunks(png_ptr, HANDLE_CHUNK_NEVER,
-        png_chunk_types_to_ignore, NUM_PNG_CHUNK_TYPES_TO_IGNORE);
+        png_set_keep_unknown_chunks(png_ptr, 1 /* PNG_HANDLE_CHUNK_NEVER */,
+          chunks_to_ignore, sizeof(chunks_to_ignore)/5);
     }
-#endif
+#endif /* PNG_UNKNOWN_CHUNKS_SUPPORTED */
+
 
     /* instead of doing png_init_io() here, now we set up our callback
      * functions for progressive decoding */
@@ -237,7 +258,7 @@ int readpng2_init(mainprog_info *mainprog_ptr)
      *                  png_set_asm_flags (png_ptr, flags);
      */
 
-#if (defined(__i386__) || defined(_M_IX86)) && \
+#if (defined(__i386__) || defined(_M_IX86) || defined(__x86_64__)) && \
     defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
     /*
      * WARNING:  This preprocessor approach means that the following code

contrib/gregbook/readpng2.h

@@ -4,13 +4,20 @@
 
   ---------------------------------------------------------------------------
 
-      Copyright (c) 1998-2001 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2008 Greg Roelofs.  All rights reserved.
 
       This software is provided "as is," without warranty of any kind,
       express or implied.  In no event shall the author or contributors
       be held liable for any damages arising in any way from the use of
       this software.
 
+      The contents of this file are DUAL-LICENSED.  You may modify and/or
+      redistribute this software according to the terms of one of the
+      following two licenses (at your option):
+
+
+      LICENSE 1 ("BSD-like with advertising clause"):
+
       Permission is granted to anyone to use this software for any purpose,
       including commercial applications, and to alter it and redistribute
       it freely, subject to the following restrictions:
@@ -27,6 +34,23 @@
             and contributors for the book, "PNG: The Definitive Guide,"
             published by O'Reilly and Associates.
 
+
+      LICENSE 2 (GNU GPL v2 or later):
+
+      This program is free software; you can redistribute it and/or modify
+      it under the terms of the GNU General Public License as published by
+      the Free Software Foundation; either version 2 of the License, or
+      (at your option) any later version.
+
+      This program is distributed in the hope that it will be useful,
+      but WITHOUT ANY WARRANTY; without even the implied warranty of
+      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+      GNU General Public License for more details.
+
+      You should have received a copy of the GNU General Public License
+      along with this program; if not, write to the Free Software Foundation,
+      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
   ---------------------------------------------------------------------------*/
 
 #ifndef TRUE
@@ -45,6 +69,12 @@
 #  define Trace(x)  ;
 #endif
 
+enum rpng2_states {
+    kPreInit = 0,
+    kWindowInit,
+    kDone
+};
+
 typedef unsigned char   uch;
 typedef unsigned short  ush;
 typedef unsigned long   ulg;
@@ -66,12 +96,12 @@ typedef struct _mainprog_info {
     int rowbytes;
     int channels;
     int need_bgcolor;
-#if (defined(__i386__) || defined(_M_IX86))
+#if (defined(__i386__) || defined(_M_IX86) || defined(__x86_64__))
     int nommxfilters;
     int nommxcombine;
     int nommxinterlace;
 #endif
-    int done;
+    int state;
     uch bg_red;
     uch bg_green;
     uch bg_blue;

contrib/gregbook/readppm.c

@@ -0,0 +1,179 @@
+/*---------------------------------------------------------------------------
+
+   rpng - simple PNG display program                              readppm.c
+
+  ---------------------------------------------------------------------------
+
+   This is a special-purpose replacement for readpng.c that allows binary
+   PPM files to be used in place of PNG images.
+
+  ---------------------------------------------------------------------------
+
+      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
+
+      This software is provided "as is," without warranty of any kind,
+      express or implied.  In no event shall the author or contributors
+      be held liable for any damages arising in any way from the use of
+      this software.
+
+      The contents of this file are DUAL-LICENSED.  You may modify and/or
+      redistribute this software according to the terms of one of the
+      following two licenses (at your option):
+
+
+      LICENSE 1 ("BSD-like with advertising clause"):
+
+      Permission is granted to anyone to use this software for any purpose,
+      including commercial applications, and to alter it and redistribute
+      it freely, subject to the following restrictions:
+
+      1. Redistributions of source code must retain the above copyright
+         notice, disclaimer, and this list of conditions.
+      2. Redistributions in binary form must reproduce the above copyright
+         notice, disclaimer, and this list of conditions in the documenta-
+         tion and/or other materials provided with the distribution.
+      3. All advertising materials mentioning features or use of this
+         software must display the following acknowledgment:
+
+            This product includes software developed by Greg Roelofs
+            and contributors for the book, "PNG: The Definitive Guide,"
+            published by O'Reilly and Associates.
+
+
+      LICENSE 2 (GNU GPL v2 or later):
+
+      This program is free software; you can redistribute it and/or modify
+      it under the terms of the GNU General Public License as published by
+      the Free Software Foundation; either version 2 of the License, or
+      (at your option) any later version.
+
+      This program is distributed in the hope that it will be useful,
+      but WITHOUT ANY WARRANTY; without even the implied warranty of
+      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+      GNU General Public License for more details.
+
+      You should have received a copy of the GNU General Public License
+      along with this program; if not, write to the Free Software Foundation,
+      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+  ---------------------------------------------------------------------------*/
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "readpng.h"    /* typedefs, common macros, public prototypes */
+
+
+ulg  width, height;
+int  bit_depth, color_type, channels;
+uch  *image_data = NULL;
+FILE *saved_infile;
+
+
+void readpng_version_info()
+{
+    fprintf(stderr, "   Compiled without libpng, zlib or PBMPLUS/NetPBM.\n");
+}
+
+
+/* return value = 0 for success, 1 for bad sig, 2 for bad IHDR, 4 for no mem */
+
+int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight)
+{
+    static uch ppmline[256];
+    int maxval;
+
+
+    saved_infile = infile;
+
+    fgets(ppmline, 256, infile);
+    if (ppmline[0] != 'P' || ppmline[1] != '6') {
+        fprintf(stderr, "ERROR:  not a PPM file\n");
+        return 1;
+    }
+    /* possible color types:  P5 = grayscale (0), P6 = RGB (2), P8 = RGBA (6) */
+    if (ppmline[1] == '6') {
+        color_type = 2;
+        channels = 3;
+    } else if (ppmline[1] == '8') {
+        color_type = 6;
+        channels = 4;
+    } else /* if (ppmline[1] == '5') */ {
+        color_type = 0;
+        channels = 1;
+    }
+
+    do {
+        fgets(ppmline, 256, infile);
+    } while (ppmline[0] == '#');
+    sscanf(ppmline, "%lu %lu", &width, &height);
+
+    do {
+        fgets(ppmline, 256, infile);
+    } while (ppmline[0] == '#');
+    sscanf(ppmline, "%d", &maxval);
+    if (maxval != 255) {
+        fprintf(stderr, "ERROR:  maxval = %d\n", maxval);
+        return 2;
+    }
+    bit_depth = 8;
+
+    *pWidth = width;
+    *pHeight = height;
+
+    return 0;
+}
+
+
+
+
+/* returns 0 if succeeds, 1 if fails due to no bKGD chunk, 2 if libpng error;
+ * scales values to 8-bit if necessary */
+
+int readpng_get_bgcolor(uch *red, uch *green, uch *blue)
+{
+    return 1;
+}
+
+
+
+
+/* display_exponent == LUT_exponent * CRT_exponent */
+
+uch *readpng_get_image(double display_exponent, int *pChannels, ulg *pRowbytes)
+{
+    ulg  rowbytes;
+
+
+    /* expand palette images to RGB, low-bit-depth grayscale images to 8 bits,
+     * transparency chunks to full alpha channel; strip 16-bit-per-sample
+     * images to 8 bits per sample; and convert grayscale to RGB[A] */
+
+    /* GRR WARNING:  grayscale needs to be expanded and channels reset! */
+
+    *pRowbytes = rowbytes = channels*width;
+    *pChannels = channels;
+
+    if ((image_data = (uch *)malloc(rowbytes*height)) == NULL) {
+        return NULL;
+    }
+
+    Trace((stderr, "readpng_get_image:  rowbytes = %ld, height = %ld\n", rowbytes, height));
+
+
+    /* now we can go ahead and just read the whole image */
+
+    fread(image_data, 1L, rowbytes*height, saved_infile);
+
+
+    return image_data;
+}
+
+
+void readpng_cleanup(int free_image_data)
+{
+    if (free_image_data && image_data) {
+        free(image_data);
+        image_data = NULL;
+    }
+}

contrib/gregbook/rpng-win.c

@@ -22,16 +22,25 @@
     - 1.02:  added extra set of parentheses to png_jmpbuf() macro; fixed
               command-line parsing bug
     - 1.10:  enabled "message window"/console (thanks to David Geldreich)
+    - 2.00:  dual-licensed (added GNU GPL)
+    - 2.01:  fixed improper display of usage screen on PNG error(s)
 
   ---------------------------------------------------------------------------
 
-      Copyright (c) 1998-2001 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2008 Greg Roelofs.  All rights reserved.
 
       This software is provided "as is," without warranty of any kind,
       express or implied.  In no event shall the author or contributors
       be held liable for any damages arising in any way from the use of
       this software.
 
+      The contents of this file are DUAL-LICENSED.  You may modify and/or
+      redistribute this software according to the terms of one of the
+      following two licenses (at your option):
+
+
+      LICENSE 1 ("BSD-like with advertising clause"):
+
       Permission is granted to anyone to use this software for any purpose,
       including commercial applications, and to alter it and redistribute
       it freely, subject to the following restrictions:
@@ -48,11 +57,28 @@
             and contributors for the book, "PNG: The Definitive Guide,"
             published by O'Reilly and Associates.
 
+
+      LICENSE 2 (GNU GPL v2 or later):
+
+      This program is free software; you can redistribute it and/or modify
+      it under the terms of the GNU General Public License as published by
+      the Free Software Foundation; either version 2 of the License, or
+      (at your option) any later version.
+
+      This program is distributed in the hope that it will be useful,
+      but WITHOUT ANY WARRANTY; without even the implied warranty of
+      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+      GNU General Public License for more details.
+
+      You should have received a copy of the GNU General Public License
+      along with this program; if not, write to the Free Software Foundation,
+      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
   ---------------------------------------------------------------------------*/
 
 #define PROGNAME  "rpng-win"
 #define LONGNAME  "Simple PNG Viewer for Windows"
-#define VERSION   "1.20 of 28 May 2001"
+#define VERSION   "2.01 of 16 March 2008"
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -85,10 +111,9 @@ static void       rpng_win_cleanup(void);
 LRESULT CALLBACK  rpng_win_wndproc(HWND, UINT, WPARAM, LPARAM);
 
 
-static char titlebar[1024], *window_name = titlebar;
+static char titlebar[1024];
 static char *progname = PROGNAME;
 static char *appname = LONGNAME;
-static char *icon_name = PROGNAME;     /* GRR:  not (yet) used */
 static char *filename;
 static FILE *infile;
 
@@ -247,40 +272,11 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
         }
     }
 
-    if (!filename) {
+    if (!filename)
         ++error;
-    } else if (!(infile = fopen(filename, "rb"))) {
-        fprintf(stderr, PROGNAME ":  can't open PNG file [%s]\n", filename);
-        ++error;
-    } else {
-        if ((rc = readpng_init(infile, &image_width, &image_height)) != 0) {
-            switch (rc) {
-                case 1:
-                    fprintf(stderr, PROGNAME
-                      ":  [%s] is not a PNG file: incorrect signature\n",
-                      filename);
-                    break;
-                case 2:
-                    fprintf(stderr, PROGNAME
-                      ":  [%s] has bad IHDR (libpng longjmp)\n",
-                      filename);
-                    break;
-                case 4:
-                    fprintf(stderr, PROGNAME ":  insufficient memory\n");
-                    break;
-                default:
-                    fprintf(stderr, PROGNAME
-                      ":  unknown readpng_init() error\n");
-                    break;
-            }
-            ++error;
-        }
-        if (error)
-            fclose(infile);
-    }
 
 
-    /* usage screen */
+    /* print usage screen if any errors up to this point */
 
     if (error) {
         int ch;
@@ -303,6 +299,47 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
             ch = _getch();
         while (ch != 'q' && ch != 'Q' && ch != 0x1B);
         exit(1);
+    }
+
+
+    if (!(infile = fopen(filename, "rb"))) {
+        fprintf(stderr, PROGNAME ":  can't open PNG file [%s]\n", filename);
+        ++error;
+    } else {
+        if ((rc = readpng_init(infile, &image_width, &image_height)) != 0) {
+            switch (rc) {
+                case 1:
+                    fprintf(stderr, PROGNAME
+                      ":  [%s] is not a PNG file: incorrect signature\n",
+                      filename);
+                    break;
+                case 2:
+                    fprintf(stderr, PROGNAME
+                      ":  [%s] has bad IHDR (libpng longjmp)\n", filename);
+                    break;
+                case 4:
+                    fprintf(stderr, PROGNAME ":  insufficient memory\n");
+                    break;
+                default:
+                    fprintf(stderr, PROGNAME
+                      ":  unknown readpng_init() error\n");
+                    break;
+            }
+            ++error;
+        }
+        if (error)
+            fclose(infile);
+    }
+
+
+    if (error) {
+        int ch;
+
+        fprintf(stderr, PROGNAME ":  aborting.\n");
+        do
+            ch = _getch();
+        while (ch != 'q' && ch != 'Q' && ch != 0x1B);
+        exit(2);
     } else {
         fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
         fprintf(stderr,
@@ -325,9 +362,14 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
      * check for one in the PNG file--if not, the initialized values of 0
      * (black) will be used */
 
-    if (have_bg)
-        sscanf(bgstr+1, "%2x%2x%2x", &bg_red, &bg_green, &bg_blue);
-    else if (readpng_get_bgcolor(&bg_red, &bg_green, &bg_blue) > 1) {
+    if (have_bg) {
+        unsigned r, g, b;   /* this approach quiets compiler warnings */
+
+        sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b);
+        bg_red   = (uch)r;
+        bg_green = (uch)g;
+        bg_blue  = (uch)b;
+    } else if (readpng_get_bgcolor(&bg_red, &bg_green, &bg_blue) > 1) {
         readpng_cleanup(TRUE);
         fprintf(stderr, PROGNAME
           ":  libpng error while checking for background color\n");

contrib/gregbook/rpng-x.c

@@ -9,7 +9,7 @@
    by Martin Zinser under OpenVMS; may work under OS/2 with some tweaking).
 
    to do:
-    - 8-bit support
+    - 8-bit (colormapped) X support
     - use %.1023s to simplify truncation of title-bar string?
 
   ---------------------------------------------------------------------------
@@ -21,18 +21,28 @@
     - 1.10:  added support for non-default visuals; fixed X pixel-conversion
     - 1.11:  added extra set of parentheses to png_jmpbuf() macro; fixed
               command-line parsing bug
-    - 1.12:  fixed small X memory leak (thanks to Francois Petitjean)
-    - 1.13:  fixed XFreeGC() crash bug
+    - 1.12:  fixed some small X memory leaks (thanks to Fran<EFBFBD>ois Petitjean)
+    - 1.13:  fixed XFreeGC() crash bug (thanks to Patrick Welche)
+    - 1.14:  added support for X resources (thanks to Gerhard Niklasch)
+    - 2.00:  dual-licensed (added GNU GPL)
+    - 2.01:  fixed improper display of usage screen on PNG error(s)
 
   ---------------------------------------------------------------------------
 
-      Copyright (c) 1998-2001 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2008 Greg Roelofs.  All rights reserved.
 
       This software is provided "as is," without warranty of any kind,
       express or implied.  In no event shall the author or contributors
       be held liable for any damages arising in any way from the use of
       this software.
 
+      The contents of this file are DUAL-LICENSED.  You may modify and/or
+      redistribute this software according to the terms of one of the
+      following two licenses (at your option):
+
+
+      LICENSE 1 ("BSD-like with advertising clause"):
+
       Permission is granted to anyone to use this software for any purpose,
       including commercial applications, and to alter it and redistribute
       it freely, subject to the following restrictions:
@@ -49,11 +59,30 @@
             and contributors for the book, "PNG: The Definitive Guide,"
             published by O'Reilly and Associates.
 
+
+      LICENSE 2 (GNU GPL v2 or later):
+
+      This program is free software; you can redistribute it and/or modify
+      it under the terms of the GNU General Public License as published by
+      the Free Software Foundation; either version 2 of the License, or
+      (at your option) any later version.
+
+      This program is distributed in the hope that it will be useful,
+      but WITHOUT ANY WARRANTY; without even the implied warranty of
+      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+      GNU General Public License for more details.
+
+      You should have received a copy of the GNU General Public License
+      along with this program; if not, write to the Free Software Foundation,
+      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
   ---------------------------------------------------------------------------*/
 
 #define PROGNAME  "rpng-x"
 #define LONGNAME  "Simple PNG Viewer for X"
-#define VERSION   "1.13 of 16 August 2001"
+#define VERSION   "2.01 of 16 March 2008"
+#define RESNAME   "rpng"	/* our X resource application name */
+#define RESCLASS  "Rpng"	/* our X resource class name */
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -91,6 +120,8 @@ static int  rpng_x_msb(ulg u32val);
 static char titlebar[1024], *window_name = titlebar;
 static char *appname = LONGNAME;
 static char *icon_name = PROGNAME;
+static char *res_name = RESNAME;
+static char *res_class = RESCLASS;
 static char *filename;
 static FILE *infile;
 
@@ -235,9 +266,33 @@ int main(int argc, char **argv)
         }
     }
 
-    if (!filename) {
+    if (!filename)
         ++error;
-    } else if (!(infile = fopen(filename, "rb"))) {
+
+
+    /* print usage screen if any errors up to this point */
+
+    if (error) {
+        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
+        readpng_version_info();
+        fprintf(stderr, "\n"
+          "Usage:  %s [-display xdpy] [-gamma exp] [-bgcolor bg] file.png\n"
+          "    xdpy\tname of the target X display (e.g., ``hostname:0'')\n"
+          "    exp \ttransfer-function exponent (``gamma'') of the display\n"
+          "\t\t  system in floating-point format (e.g., ``%.1f''); equal\n"
+          "\t\t  to the product of the lookup-table exponent (varies)\n"
+          "\t\t  and the CRT exponent (usually 2.2); must be positive\n"
+          "    bg  \tdesired background color in 7-character hex RGB format\n"
+          "\t\t  (e.g., ``#ff7700'' for orange:  same as HTML colors);\n"
+          "\t\t  used with transparent images\n"
+          "\nPress Q, Esc or mouse button 1 (within image window, after image\n"
+          "is displayed) to quit.\n"
+          "\n", PROGNAME, default_display_exponent);
+        exit(1);
+    }
+
+
+    if (!(infile = fopen(filename, "rb"))) {
         fprintf(stderr, PROGNAME ":  can't open PNG file [%s]\n", filename);
         ++error;
     } else {
@@ -250,8 +305,7 @@ int main(int argc, char **argv)
                     break;
                 case 2:
                     fprintf(stderr, PROGNAME
-                      ":  [%s] has bad IHDR (libpng longjmp)\n",
-                      filename);
+                      ":  [%s] has bad IHDR (libpng longjmp)\n", filename);
                     break;
                 case 4:
                     fprintf(stderr, PROGNAME ":  insufficient memory\n");
@@ -276,25 +330,9 @@ int main(int argc, char **argv)
     }
 
 
-    /* usage screen */
-
     if (error) {
-        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
-        readpng_version_info();
-        fprintf(stderr, "\n"
-          "Usage:  %s [-display xdpy] [-gamma exp] [-bgcolor bg] file.png\n"
-          "    xdpy\tname of the target X display (e.g., ``hostname:0'')\n"
-          "    exp \ttransfer-function exponent (``gamma'') of the display\n"
-          "\t\t  system in floating-point format (e.g., ``%.1f''); equal\n"
-          "\t\t  to the product of the lookup-table exponent (varies)\n"
-          "\t\t  and the CRT exponent (usually 2.2); must be positive\n"
-          "    bg  \tdesired background color in 7-character hex RGB format\n"
-          "\t\t  (e.g., ``#ff7700'' for orange:  same as HTML colors);\n"
-          "\t\t  used with transparent images\n"
-          "\nPress Q, Esc or mouse button 1 (within image window, after image\n"
-          "is displayed) to quit.\n"
-          "\n", PROGNAME, default_display_exponent);
-        exit(1);
+        fprintf(stderr, PROGNAME ":  aborting.\n");
+        exit(2);
     }
 
 
@@ -399,11 +437,12 @@ static int rpng_x_create_window(void)
     XEvent e;
     XGCValues gcvalues;
     XSetWindowAttributes attr;
-    XSizeHints *size_hints;
     XTextProperty windowName, *pWindowName = &windowName;
     XTextProperty iconName, *pIconName = &iconName;
     XVisualInfo visual_info;
+    XSizeHints *size_hints;
     XWMHints *wm_hints;
+    XClassHint *class_hints;
 
 
     screen = DefaultScreen(display);
@@ -526,7 +565,7 @@ static int rpng_x_create_window(void)
     if (!XStringListToTextProperty(&icon_name, 1, pIconName))
         pIconName = NULL;
 
-    /* OK if either hints allocation fails; XSetWMProperties() allows NULLs */
+    /* OK if any hints allocation fails; XSetWMProperties() allows NULLs */
 
     if ((size_hints = XAllocSizeHints()) != NULL) {
         /* window will not be resizable */
@@ -542,8 +581,13 @@ static int rpng_x_create_window(void)
         wm_hints->flags = StateHint | InputHint  /* | IconPixmapHint */ ;
     }
 
+    if ((class_hints = XAllocClassHint()) != NULL) {
+        class_hints->res_name = res_name;
+        class_hints->res_class = res_class;
+    }
+
     XSetWMProperties(display, window, pWindowName, pIconName, NULL, 0,
-      size_hints, wm_hints, NULL);
+      size_hints, wm_hints, class_hints);
 
     /* various properties and hints no longer needed; free memory */
     if (pWindowName)
@@ -554,6 +598,8 @@ static int rpng_x_create_window(void)
         XFree(size_hints);
     if (wm_hints)
        XFree(wm_hints);
+    if (class_hints)
+       XFree(class_hints);
 
     XMapWindow(display, window);
 

contrib/gregbook/rpng2-win.c

@@ -10,7 +10,7 @@
    tweaking (or maybe not).  Thanks to Adam Costello and Pieter S. van der
    Meulen for the "diamond" and "radial waves" patterns, respectively.
 
-   to do:
+   to do (someday, maybe):
     - handle quoted command-line args (especially filenames with spaces)
     - finish resizable checkerboard-gradient (sizes 4-128?)
     - use %.1023s to simplify truncation of title-bar string?
@@ -27,16 +27,28 @@
     - 1.10:  enabled "message window"/console (thanks to David Geldreich)
     - 1.20:  added runtime MMX-enabling/disabling and new -mmx* options
     - 1.21:  made minor tweak to usage screen to fit within 25-line console
+    - 1.22:  added AMD64/EM64T support (__x86_64__)
+    - 2.00:  dual-licensed (added GNU GPL)
+    - 2.01:  fixed 64-bit typo in readpng2.c
+    - 2.02:  fixed improper display of usage screen on PNG error(s); fixed
+              unexpected-EOF and file-read-error cases
 
   ---------------------------------------------------------------------------
 
-      Copyright (c) 1998-2001 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2008 Greg Roelofs.  All rights reserved.
 
       This software is provided "as is," without warranty of any kind,
       express or implied.  In no event shall the author or contributors
       be held liable for any damages arising in any way from the use of
       this software.
 
+      The contents of this file are DUAL-LICENSED.  You may modify and/or
+      redistribute this software according to the terms of one of the
+      following two licenses (at your option):
+
+
+      LICENSE 1 ("BSD-like with advertising clause"):
+
       Permission is granted to anyone to use this software for any purpose,
       including commercial applications, and to alter it and redistribute
       it freely, subject to the following restrictions:
@@ -53,11 +65,28 @@
             and contributors for the book, "PNG: The Definitive Guide,"
             published by O'Reilly and Associates.
 
+
+      LICENSE 2 (GNU GPL v2 or later):
+
+      This program is free software; you can redistribute it and/or modify
+      it under the terms of the GNU General Public License as published by
+      the Free Software Foundation; either version 2 of the License, or
+      (at your option) any later version.
+
+      This program is distributed in the hope that it will be useful,
+      but WITHOUT ANY WARRANTY; without even the implied warranty of
+      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+      GNU General Public License for more details.
+
+      You should have received a copy of the GNU General Public License
+      along with this program; if not, write to the Free Software Foundation,
+      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
   ---------------------------------------------------------------------------*/
 
 #define PROGNAME  "rpng2-win"
 #define LONGNAME  "Progressive PNG Viewer for Windows"
-#define VERSION   "1.21 of 29 June 2001"
+#define VERSION   "2.02 of 16 March 2008"
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -119,10 +148,9 @@ static void       rpng2_win_cleanup(void);
 LRESULT CALLBACK  rpng2_win_wndproc(HWND, UINT, WPARAM, LPARAM);
 
 
-static char titlebar[1024], *window_name = titlebar;
+static char titlebar[1024];
 static char *progname = PROGNAME;
 static char *appname = LONGNAME;
-static char *icon_name = PROGNAME;    /* GRR:  not (yet) used */
 static char *filename;
 static FILE *infile;
 
@@ -367,7 +395,7 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
             }
         } else if (!strncmp(*argv, "-timing", 2)) {
             timing = TRUE;
-#if (defined(__i386__) || defined(_M_IX86))
+#if (defined(__i386__) || defined(_M_IX86) || defined(__x86_64__))
         } else if (!strncmp(*argv, "-nommxfilters", 7)) {
             rpng2_info.nommxfilters = TRUE;
         } else if (!strncmp(*argv, "-nommxcombine", 7)) {
@@ -389,9 +417,54 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
         }
     }
 
-    if (!filename) {
+    if (!filename)
         ++error;
-    } else if (!(infile = fopen(filename, "rb"))) {
+
+
+    /* print usage screen if any errors up to this point */
+
+    if (error) {
+        int ch;
+
+        fprintf(stderr, "\n%s %s:  %s\n\n", PROGNAME, VERSION, appname);
+        readpng2_version_info();
+        fprintf(stderr, "\n"
+          "Usage:  %s [-gamma exp] [-bgcolor bg | -bgpat pat] [-timing]\n"
+#if (defined(__i386__) || defined(_M_IX86) || defined(__x86_64__))
+          "        %*s [[-nommxfilters] [-nommxcombine] [-nommxinterlace] | -nommx]\n"
+#endif
+          "        %*s file.png\n\n"
+          "    exp \ttransfer-function exponent (``gamma'') of the display\n"
+          "\t\t  system in floating-point format (e.g., ``%.1f''); equal\n"
+          "\t\t  to the product of the lookup-table exponent (varies)\n"
+          "\t\t  and the CRT exponent (usually 2.2); must be positive\n"
+          "    bg  \tdesired background color in 7-character hex RGB format\n"
+          "\t\t  (e.g., ``#ff7700'' for orange:  same as HTML colors);\n"
+          "\t\t  used with transparent images; overrides -bgpat option\n"
+          "    pat \tdesired background pattern number (1-%d); used with\n"
+          "\t\t  transparent images; overrides -bgcolor option\n"
+          "    -timing\tenables delay for every block read, to simulate modem\n"
+          "\t\t  download of image (~36 Kbps)\n"
+#if (defined(__i386__) || defined(_M_IX86) || defined(__x86_64__))
+          "    -nommx*\tdisable optimized MMX routines for decoding row filters,\n"
+          "\t\t  combining rows, and expanding interlacing, respectively\n"
+#endif
+          "\nPress Q, Esc or mouse button 1 after image is displayed to quit.\n"
+          "Press Q or Esc to quit this usage screen. ",
+          PROGNAME,
+#if (defined(__i386__) || defined(_M_IX86) || defined(__x86_64__))
+          (int)strlen(PROGNAME), " ",
+#endif
+          (int)strlen(PROGNAME), " ", default_display_exponent, num_bgpat);
+        fflush(stderr);
+        do
+            ch = _getch();
+        while (ch != 'q' && ch != 'Q' && ch != 0x1B);
+        exit(1);
+    }
+
+
+    if (!(infile = fopen(filename, "rb"))) {
         fprintf(stderr, PROGNAME ":  can't open PNG file [%s]\n", filename);
         ++error;
     } else {
@@ -405,8 +478,7 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
             switch (rc) {
                 case 2:
                     fprintf(stderr, PROGNAME
-                      ":  [%s] has bad IHDR (libpng longjmp)\n",
-                      filename);
+                      ":  [%s] has bad IHDR (libpng longjmp)\n", filename);
                     break;
                 case 4:
                     fprintf(stderr, PROGNAME ":  insufficient memory\n");
@@ -423,46 +495,14 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
     }
 
 
-    /* usage screen */
-
     if (error) {
         int ch;
 
-        fprintf(stderr, "\n%s %s:  %s\n\n", PROGNAME, VERSION, appname);
-        readpng2_version_info();
-        fprintf(stderr, "\n"
-          "Usage:  %s [-gamma exp] [-bgcolor bg | -bgpat pat] [-timing]\n"
-#if (defined(__i386__) || defined(_M_IX86))
-          "        %*s [[-nommxfilters] [-nommxcombine] [-nommxinterlace] | -nommx]\n"
-#endif
-          "        %*s file.png\n\n"
-          "    exp \ttransfer-function exponent (``gamma'') of the display\n"
-          "\t\t  system in floating-point format (e.g., ``%.1f''); equal\n"
-          "\t\t  to the product of the lookup-table exponent (varies)\n"
-          "\t\t  and the CRT exponent (usually 2.2); must be positive\n"
-          "    bg  \tdesired background color in 7-character hex RGB format\n"
-          "\t\t  (e.g., ``#ff7700'' for orange:  same as HTML colors);\n"
-          "\t\t  used with transparent images; overrides -bgpat option\n"
-          "    pat \tdesired background pattern number (1-%d); used with\n"
-          "\t\t  transparent images; overrides -bgcolor option\n"
-          "    -timing\tenables delay for every block read, to simulate modem\n"
-          "\t\t  download of image (~36 Kbps)\n"
-#if (defined(__i386__) || defined(_M_IX86))
-          "    -nommx*\tdisable optimized MMX routines for decoding row filters,\n"
-          "\t\t  combining rows, and expanding interlacing, respectively\n"
-#endif
-          "\nPress Q, Esc or mouse button 1 after image is displayed to quit.\n"
-          "Press Q or Esc to quit this usage screen. ",
-          PROGNAME,
-#if (defined(__i386__) || defined(_M_IX86))
-          strlen(PROGNAME), " ",
-#endif
-          strlen(PROGNAME), " ", default_display_exponent, num_bgpat);
-        fflush(stderr);
+        fprintf(stderr, PROGNAME ":  aborting.\n");
         do
             ch = _getch();
         while (ch != 'q' && ch != 'Q' && ch != 0x1B);
-        exit(1);
+        exit(2);
     } else {
         fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
         fprintf(stderr,
@@ -494,7 +534,7 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
     } else
         rpng2_info.need_bgcolor = TRUE;
 
-    rpng2_info.done = FALSE;
+    rpng2_info.state = kPreInit;
     rpng2_info.mainprog_init = rpng2_win_init;
     rpng2_info.mainprog_display_row = rpng2_win_display_row;
     rpng2_info.mainprog_finish_display = rpng2_win_finish_display;
@@ -514,10 +554,27 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
         if (readpng2_decode_data(&rpng2_info, inbuf, incount))
             ++error;
         Trace((stderr, "done with readpng2_decode_data()\n"))
-        if (error || feof(infile) || rpng2_info.done)
+
+        if (error || incount != INBUFSIZE || rpng2_info.state == kDone) {
+            if (rpng2_info.state == kDone) {
+                Trace((stderr, "done decoding PNG image\n"))
+            } else if (ferror(infile)) {
+                fprintf(stderr, PROGNAME
+                  ":  error while reading PNG image file\n");
+                exit(3);
+            } else if (feof(infile)) {
+                fprintf(stderr, PROGNAME ":  end of file reached "
+                  "(unexpectedly) while reading PNG image file\n");
+                exit(3);
+            } else /* if (error) */ {
+                // will print error message below
+            }
             break;
+        }
+
         if (timing)
             Sleep(1000L);
+
         incount = fread(inbuf, 1, INBUFSIZE, infile);
     }
 
@@ -564,7 +621,7 @@ static void rpng2_win_init()
     ulg rowbytes = rpng2_info.rowbytes;
 
     Trace((stderr, "beginning rpng2_win_init()\n"))
-    Trace((stderr, "  rowbytes = %ld\n", rpng2_info.rowbytes))
+    Trace((stderr, "  rowbytes = %d\n", rpng2_info.rowbytes))
     Trace((stderr, "  width  = %ld\n", rpng2_info.width))
     Trace((stderr, "  height = %ld\n", rpng2_info.height))
 
@@ -594,6 +651,8 @@ static void rpng2_win_init()
         readpng2_cleanup(&rpng2_info);
         return;
     }
+
+    rpng2_info.state = kWindowInit;
 }
 
 
@@ -1089,7 +1148,7 @@ static void rpng2_win_finish_display()
      * we have nothing to do here except set a flag and let the user know
      * that the image is done */
 
-    rpng2_info.done = TRUE;
+    rpng2_info.state = kDone;
     printf(
       "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n");
     fflush(stdout);

contrib/gregbook/wpng.c

@@ -5,8 +5,10 @@
    This program converts certain NetPBM binary files (grayscale and RGB,
    maxval = 255) to PNG.  Non-interlaced PNGs are written progressively;
    interlaced PNGs are read and written in one memory-intensive blast.
+
    Thanks to Jean-loup Gailly for providing the necessary trick to read
-   interactive text from the keyboard while stdin is redirected.
+   interactive text from the keyboard while stdin is redirected.  Thanks
+   to Cosmin Truta for Cygwin fixes.
 
    NOTE:  includes provisional support for PNM type "8" (portable alphamap)
           images, presumed to be a 32-bit interleaved RGBA format; no pro-
@@ -24,16 +26,32 @@
     - 1.02:  modified to allow abbreviated options
     - 1.03:  removed extraneous character from usage screen; fixed bug in
               command-line parsing
+    - 1.04:  fixed DOS/OS2/Win32 detection, including partial Cygwin fix
+              (see http://home.att.net/~perlspinr/diffs/GregBook_cygwin.diff)
+    - 2.00:  dual-licensed (added GNU GPL)
+
+        [REPORTED BUG (win32 only):  "contrib/gregbook/wpng.c - cmd line
+         dose not work!  In order to do something useful I needed to redirect
+         both input and output, with cygwin and with bcc32 as well.  Under
+         Linux, the same wpng appears to work fine.  I don't know what is
+         the problem."]
 
   ---------------------------------------------------------------------------
 
-      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
 
       This software is provided "as is," without warranty of any kind,
       express or implied.  In no event shall the author or contributors
       be held liable for any damages arising in any way from the use of
       this software.
 
+      The contents of this file are DUAL-LICENSED.  You may modify and/or
+      redistribute this software according to the terms of one of the
+      following two licenses (at your option):
+
+
+      LICENSE 1 ("BSD-like with advertising clause"):
+
       Permission is granted to anyone to use this software for any purpose,
       including commercial applications, and to alter it and redistribute
       it freely, subject to the following restrictions:
@@ -50,16 +68,35 @@
             and contributors for the book, "PNG: The Definitive Guide,"
             published by O'Reilly and Associates.
 
+
+      LICENSE 2 (GNU GPL v2 or later):
+
+      This program is free software; you can redistribute it and/or modify
+      it under the terms of the GNU General Public License as published by
+      the Free Software Foundation; either version 2 of the License, or
+      (at your option) any later version.
+
+      This program is distributed in the hope that it will be useful,
+      but WITHOUT ANY WARRANTY; without even the implied warranty of
+      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+      GNU General Public License for more details.
+
+      You should have received a copy of the GNU General Public License
+      along with this program; if not, write to the Free Software Foundation,
+      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
   ---------------------------------------------------------------------------*/
 
 #define PROGNAME  "wpng"
-#define VERSION   "1.03 of 19 March 2000"
+#define VERSION   "2.00 of 2 June 2007"
 #define APPNAME   "Simple PGM/PPM/PAM to PNG Converter"
 
 #if defined(__MSDOS__) || defined(__OS2__)
 #  define DOS_OS2_W32
-#elif defined(_WIN32) || defined(__WIN32__)
-#  define DOS_OS2_W32
+#elif defined(WIN32) || defined(_WIN32) || defined(__WIN32__)
+#  ifndef __GNUC__   /* treat Win32 native ports of gcc as Unix environments */
+#    define DOS_OS2_W32
+#  endif
 #endif
 
 #include <stdio.h>

contrib/gregbook/writepng.c

@@ -4,13 +4,20 @@
 
   ---------------------------------------------------------------------------
 
-      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
 
       This software is provided "as is," without warranty of any kind,
       express or implied.  In no event shall the author or contributors
       be held liable for any damages arising in any way from the use of
       this software.
 
+      The contents of this file are DUAL-LICENSED.  You may modify and/or
+      redistribute this software according to the terms of one of the
+      following two licenses (at your option):
+
+
+      LICENSE 1 ("BSD-like with advertising clause"):
+
       Permission is granted to anyone to use this software for any purpose,
       including commercial applications, and to alter it and redistribute
       it freely, subject to the following restrictions:
@@ -27,6 +34,23 @@
             and contributors for the book, "PNG: The Definitive Guide,"
             published by O'Reilly and Associates.
 
+
+      LICENSE 2 (GNU GPL v2 or later):
+
+      This program is free software; you can redistribute it and/or modify
+      it under the terms of the GNU General Public License as published by
+      the Free Software Foundation; either version 2 of the License, or
+      (at your option) any later version.
+
+      This program is distributed in the hope that it will be useful,
+      but WITHOUT ANY WARRANTY; without even the implied warranty of
+      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+      GNU General Public License for more details.
+
+      You should have received a copy of the GNU General Public License
+      along with this program; if not, write to the Free Software Foundation,
+      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
   ---------------------------------------------------------------------------*/
 
 

contrib/gregbook/writepng.h

@@ -4,13 +4,20 @@
 
   ---------------------------------------------------------------------------
 
-      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
 
       This software is provided "as is," without warranty of any kind,
       express or implied.  In no event shall the author or contributors
       be held liable for any damages arising in any way from the use of
       this software.
 
+      The contents of this file are DUAL-LICENSED.  You may modify and/or
+      redistribute this software according to the terms of one of the
+      following two licenses (at your option):
+
+
+      LICENSE 1 ("BSD-like with advertising clause"):
+
       Permission is granted to anyone to use this software for any purpose,
       including commercial applications, and to alter it and redistribute
       it freely, subject to the following restrictions:
@@ -27,6 +34,23 @@
             and contributors for the book, "PNG: The Definitive Guide,"
             published by O'Reilly and Associates.
 
+
+      LICENSE 2 (GNU GPL v2 or later):
+
+      This program is free software; you can redistribute it and/or modify
+      it under the terms of the GNU General Public License as published by
+      the Free Software Foundation; either version 2 of the License, or
+      (at your option) any later version.
+
+      This program is distributed in the hope that it will be useful,
+      but WITHOUT ANY WARRANTY; without even the implied warranty of
+      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+      GNU General Public License for more details.
+
+      You should have received a copy of the GNU General Public License
+      along with this program; if not, write to the Free Software Foundation,
+      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
   ---------------------------------------------------------------------------*/
 
 #ifndef TRUE

contrib/pngminus/README

@@ -20,7 +20,7 @@ Soon after the creation of PNG in 1995, the need was felt for a set of
 pnmtopng / pngtopnm utilities. Independantly Alexander Lehmann and I
 (Willem van Schaik) started such a project. Luckily we discovered this
 and merged the two together into pnmtopng.tar.gz, which is available
-from a/o ftp://swrinde.nde.swri.edu/pub/png/.
+from a/o ftp://ftp.simplesystems.org/pub/libpng/png/.
 
 These two utilities have many, many options and make use of most of the
 features of PNG, like gamma, alpha, sbit, text-chunks, etc. This makes

contrib/pngminus/png2pnm.sh

@@ -1,3 +1,4 @@
+#!/bin/sh
 # -- grayscale
 ./png2pnm -noraw ../pngsuite/basn0g01.png basn0g01.pgm
 ./png2pnm -noraw ../pngsuite/basn0g02.png basn0g02.pgm

contrib/pngminus/pngminus.sh

@@ -1,3 +1,4 @@
+#!/bin/sh
 make -f makefile.std
 sh png2pnm.sh
 sh pnm2png.sh

contrib/pngminus/pnm2png.sh

@@ -1,3 +1,4 @@
+#!/bin/sh
 # -- grayscale
 ./pnm2png basn0g01.pgm basn0g01.png
 ./pnm2png basn0g02.pgm basn0g02.png

contrib/visupng/VisualPng.rc

@@ -1,152 +1,152 @@
-//Microsoft Developer Studio generated resource script.
-//
-#include "resource.h"
-
-#define APSTUDIO_READONLY_SYMBOLS
-/////////////////////////////////////////////////////////////////////////////
-//
-// Generated from the TEXTINCLUDE 2 resource.
-//
-#include "afxres.h"
-
-/////////////////////////////////////////////////////////////////////////////
-#undef APSTUDIO_READONLY_SYMBOLS
-
-/////////////////////////////////////////////////////////////////////////////
-// English (U.S.) resources
-
-#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENU)
-#ifdef _WIN32
-LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
-#pragma code_page(1252)
-#endif //_WIN32
-
-#ifdef APSTUDIO_INVOKED
-/////////////////////////////////////////////////////////////////////////////
-//
-// TEXTINCLUDE
-//
-
-1 TEXTINCLUDE DISCARDABLE 
-BEGIN
-    "resource.h\0"
-END
-
-2 TEXTINCLUDE DISCARDABLE 
-BEGIN
-    "#include ""afxres.h""\r\n"
-    "\0"
-END
-
-3 TEXTINCLUDE DISCARDABLE 
-BEGIN
-    "\r\n"
-    "\0"
-END
-
-#endif    // APSTUDIO_INVOKED
-
-
-/////////////////////////////////////////////////////////////////////////////
-//
-// Menu
-//
-
-VISUALPNG MENU DISCARDABLE 
-BEGIN
-    POPUP "&File"
-    BEGIN
-        MENUITEM "&Open Image...\tCtrl+O",      IDM_FILE_OPEN
-        MENUITEM "Save &As...",                 IDM_FILE_SAVE
-        MENUITEM SEPARATOR
-        MENUITEM "&Next Image\tCtrl+N",         IDM_FILE_NEXT
-        MENUITEM "Pre&vious Image\tCtrl+V",     IDM_FILE_PREVIOUS
-        MENUITEM SEPARATOR
-        MENUITEM "E&xit\tAlt+X",                IDM_FILE_EXIT
-    END
-    POPUP "&Options"
-    BEGIN
-        MENUITEM "&Stretch",                    IDM_OPTIONS_STRETCH, CHECKED
-    END
-    POPUP "&Help"
-    BEGIN
-        MENUITEM "&About",                      IDM_HELP_ABOUT
-    END
-END
-
-
-/////////////////////////////////////////////////////////////////////////////
-//
-// Accelerator
-//
-
-VISUALPNG ACCELERATORS DISCARDABLE 
-BEGIN
-    "N",            IDM_FILE_NEXT,          VIRTKEY, CONTROL, NOINVERT
-    "O",            IDM_FILE_OPEN,          VIRTKEY, CONTROL, NOINVERT
-    "P",            IDM_FILE_PREVIOUS,      VIRTKEY, CONTROL, NOINVERT
-    "V",            IDM_FILE_PREVIOUS,      VIRTKEY, CONTROL, NOINVERT
-    "X",            IDM_FILE_EXIT,          VIRTKEY, ALT, NOINVERT
-END
-
-
-/////////////////////////////////////////////////////////////////////////////
-//
-// Icon
-//
-
-// Icon with lowest ID value placed first to ensure application icon
-// remains consistent on all systems.
-VISUALPNG               ICON    DISCARDABLE     "VisualPng.ico"
-
-/////////////////////////////////////////////////////////////////////////////
-//
-// Dialog
-//
-
-ABOUTBOX DIALOG DISCARDABLE  0, 0, 186, 94
-STYLE DS_MODALFRAME | WS_POPUP
-FONT 8, "MS Sans Serif"
-BEGIN
-    DEFPUSHBUTTON   "OK",IDOK,68,67,50,14
-    CTEXT           "VisualPng 1.0  -  June 2000",IDC_STATIC,49,14,88,8
-    LTEXT           "a PNG image viewer",IDC_STATIC,60,30,66,8
-    LTEXT           "(c) Willem van Schaik, 2000",IDC_STATIC,48,52,90,8
-    LTEXT           "to demonstrate the use of libpng in Visual C",
-                    IDC_STATIC,25,38,136,8
-END
-
-
-/////////////////////////////////////////////////////////////////////////////
-//
-// DESIGNINFO
-//
-
-#ifdef APSTUDIO_INVOKED
-GUIDELINES DESIGNINFO DISCARDABLE 
-BEGIN
-    "ABOUTBOX", DIALOG
-    BEGIN
-        LEFTMARGIN, 7
-        RIGHTMARGIN, 179
-        TOPMARGIN, 7
-        BOTTOMMARGIN, 87
-    END
-END
-#endif    // APSTUDIO_INVOKED
-
-#endif    // English (U.S.) resources
-/////////////////////////////////////////////////////////////////////////////
-
-
-
-#ifndef APSTUDIO_INVOKED
-/////////////////////////////////////////////////////////////////////////////
-//
-// Generated from the TEXTINCLUDE 3 resource.
-//
-
-
-/////////////////////////////////////////////////////////////////////////////
-#endif    // not APSTUDIO_INVOKED
-
+//Microsoft Developer Studio generated resource script.
+//
+#include "resource.h"
+
+#define APSTUDIO_READONLY_SYMBOLS
+/////////////////////////////////////////////////////////////////////////////
+//
+// Generated from the TEXTINCLUDE 2 resource.
+//
+#include "afxres.h"
+
+/////////////////////////////////////////////////////////////////////////////
+#undef APSTUDIO_READONLY_SYMBOLS
+
+/////////////////////////////////////////////////////////////////////////////
+// English (U.S.) resources
+
+#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENU)
+#ifdef _WIN32
+LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
+#pragma code_page(1252)
+#endif //_WIN32
+
+#ifdef APSTUDIO_INVOKED
+/////////////////////////////////////////////////////////////////////////////
+//
+// TEXTINCLUDE
+//
+
+1 TEXTINCLUDE DISCARDABLE 
+BEGIN
+    "resource.h\0"
+END
+
+2 TEXTINCLUDE DISCARDABLE 
+BEGIN
+    "#include ""afxres.h""\r\n"
+    "\0"
+END
+
+3 TEXTINCLUDE DISCARDABLE 
+BEGIN
+    "\r\n"
+    "\0"
+END
+
+#endif    // APSTUDIO_INVOKED
+
+
+/////////////////////////////////////////////////////////////////////////////
+//
+// Menu
+//
+
+VISUALPNG MENU DISCARDABLE 
+BEGIN
+    POPUP "&File"
+    BEGIN
+        MENUITEM "&Open Image...\tCtrl+O",      IDM_FILE_OPEN
+        MENUITEM "Save &As...",                 IDM_FILE_SAVE
+        MENUITEM SEPARATOR
+        MENUITEM "&Next Image\tCtrl+N",         IDM_FILE_NEXT
+        MENUITEM "Pre&vious Image\tCtrl+V",     IDM_FILE_PREVIOUS
+        MENUITEM SEPARATOR
+        MENUITEM "E&xit\tAlt+X",                IDM_FILE_EXIT
+    END
+    POPUP "&Options"
+    BEGIN
+        MENUITEM "&Stretch",                    IDM_OPTIONS_STRETCH, CHECKED
+    END
+    POPUP "&Help"
+    BEGIN
+        MENUITEM "&About",                      IDM_HELP_ABOUT
+    END
+END
+
+
+/////////////////////////////////////////////////////////////////////////////
+//
+// Accelerator
+//
+
+VISUALPNG ACCELERATORS DISCARDABLE 
+BEGIN
+    "N",            IDM_FILE_NEXT,          VIRTKEY, CONTROL, NOINVERT
+    "O",            IDM_FILE_OPEN,          VIRTKEY, CONTROL, NOINVERT
+    "P",            IDM_FILE_PREVIOUS,      VIRTKEY, CONTROL, NOINVERT
+    "V",            IDM_FILE_PREVIOUS,      VIRTKEY, CONTROL, NOINVERT
+    "X",            IDM_FILE_EXIT,          VIRTKEY, ALT, NOINVERT
+END
+
+
+/////////////////////////////////////////////////////////////////////////////
+//
+// Icon
+//
+
+// Icon with lowest ID value placed first to ensure application icon
+// remains consistent on all systems.
+VISUALPNG               ICON    DISCARDABLE     "VisualPng.ico"
+
+/////////////////////////////////////////////////////////////////////////////
+//
+// Dialog
+//
+
+ABOUTBOX DIALOG DISCARDABLE  0, 0, 186, 94
+STYLE DS_MODALFRAME | WS_POPUP
+FONT 8, "MS Sans Serif"
+BEGIN
+    DEFPUSHBUTTON   "OK",IDOK,68,67,50,14
+    CTEXT           "VisualPng 1.0  -  June 2000",IDC_STATIC,49,14,88,8
+    LTEXT           "a PNG image viewer",IDC_STATIC,60,30,66,8
+    LTEXT           "(c) Willem van Schaik, 2000",IDC_STATIC,48,52,90,8
+    LTEXT           "to demonstrate the use of libpng in Visual C",
+                    IDC_STATIC,25,38,136,8
+END
+
+
+/////////////////////////////////////////////////////////////////////////////
+//
+// DESIGNINFO
+//
+
+#ifdef APSTUDIO_INVOKED
+GUIDELINES DESIGNINFO DISCARDABLE 
+BEGIN
+    "ABOUTBOX", DIALOG
+    BEGIN
+        LEFTMARGIN, 7
+        RIGHTMARGIN, 179
+        TOPMARGIN, 7
+        BOTTOMMARGIN, 87
+    END
+END
+#endif    // APSTUDIO_INVOKED
+
+#endif    // English (U.S.) resources
+/////////////////////////////////////////////////////////////////////////////
+
+
+
+#ifndef APSTUDIO_INVOKED
+/////////////////////////////////////////////////////////////////////////////
+//
+// Generated from the TEXTINCLUDE 3 resource.
+//
+
+
+/////////////////////////////////////////////////////////////////////////////
+#endif    // not APSTUDIO_INVOKED
+

depcomp

@@ -0,0 +1,589 @@
+#! /bin/sh
+# depcomp - compile a program generating dependencies as side-effects
+
+scriptversion=2007-03-29.01
+
+# Copyright (C) 1999, 2000, 2003, 2004, 2005, 2006, 2007 Free Software
+# Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301, USA.
+
+# As a special exception to the GNU General Public License, if you
+# distribute this file as part of a program that contains a
+# configuration script generated by Autoconf, you may include it under
+# the same distribution terms that you use for the rest of that program.
+
+# Originally written by Alexandre Oliva <oliva@dcc.unicamp.br>.
+
+case $1 in
+  '')
+     echo "$0: No command.  Try \`$0 --help' for more information." 1>&2
+     exit 1;
+     ;;
+  -h | --h*)
+    cat <<\EOF
+Usage: depcomp [--help] [--version] PROGRAM [ARGS]
+
+Run PROGRAMS ARGS to compile a file, generating dependencies
+as side-effects.
+
+Environment variables:
+  depmode     Dependency tracking mode.
+  source      Source file read by `PROGRAMS ARGS'.
+  object      Object file output by `PROGRAMS ARGS'.
+  DEPDIR      directory where to store dependencies.
+  depfile     Dependency file to output.
+  tmpdepfile  Temporary file to use when outputing dependencies.
+  libtool     Whether libtool is used (yes/no).
+
+Report bugs to <bug-automake@gnu.org>.
+EOF
+    exit $?
+    ;;
+  -v | --v*)
+    echo "depcomp $scriptversion"
+    exit $?
+    ;;
+esac
+
+if test -z "$depmode" || test -z "$source" || test -z "$object"; then
+  echo "depcomp: Variables source, object and depmode must be set" 1>&2
+  exit 1
+fi
+
+# Dependencies for sub/bar.o or sub/bar.obj go into sub/.deps/bar.Po.
+depfile=${depfile-`echo "$object" |
+  sed 's|[^\\/]*$|'${DEPDIR-.deps}'/&|;s|\.\([^.]*\)$|.P\1|;s|Pobj$|Po|'`}
+tmpdepfile=${tmpdepfile-`echo "$depfile" | sed 's/\.\([^.]*\)$/.T\1/'`}
+
+rm -f "$tmpdepfile"
+
+# Some modes work just like other modes, but use different flags.  We
+# parameterize here, but still list the modes in the big case below,
+# to make depend.m4 easier to write.  Note that we *cannot* use a case
+# here, because this file can only contain one case statement.
+if test "$depmode" = hp; then
+  # HP compiler uses -M and no extra arg.
+  gccflag=-M
+  depmode=gcc
+fi
+
+if test "$depmode" = dashXmstdout; then
+   # This is just like dashmstdout with a different argument.
+   dashmflag=-xM
+   depmode=dashmstdout
+fi
+
+case "$depmode" in
+gcc3)
+## gcc 3 implements dependency tracking that does exactly what
+## we want.  Yay!  Note: for some reason libtool 1.4 doesn't like
+## it if -MD -MP comes after the -MF stuff.  Hmm.
+## Unfortunately, FreeBSD c89 acceptance of flags depends upon
+## the command line argument order; so add the flags where they
+## appear in depend2.am.  Note that the slowdown incurred here
+## affects only configure: in makefiles, %FASTDEP% shortcuts this.
+  for arg
+  do
+    case $arg in
+    -c) set fnord "$@" -MT "$object" -MD -MP -MF "$tmpdepfile" "$arg" ;;
+    *)  set fnord "$@" "$arg" ;;
+    esac
+    shift # fnord
+    shift # $arg
+  done
+  "$@"
+  stat=$?
+  if test $stat -eq 0; then :
+  else
+    rm -f "$tmpdepfile"
+    exit $stat
+  fi
+  mv "$tmpdepfile" "$depfile"
+  ;;
+
+gcc)
+## There are various ways to get dependency output from gcc.  Here's
+## why we pick this rather obscure method:
+## - Don't want to use -MD because we'd like the dependencies to end
+##   up in a subdir.  Having to rename by hand is ugly.
+##   (We might end up doing this anyway to support other compilers.)
+## - The DEPENDENCIES_OUTPUT environment variable makes gcc act like
+##   -MM, not -M (despite what the docs say).
+## - Using -M directly means running the compiler twice (even worse
+##   than renaming).
+  if test -z "$gccflag"; then
+    gccflag=-MD,
+  fi
+  "$@" -Wp,"$gccflag$tmpdepfile"
+  stat=$?
+  if test $stat -eq 0; then :
+  else
+    rm -f "$tmpdepfile"
+    exit $stat
+  fi
+  rm -f "$depfile"
+  echo "$object : \\" > "$depfile"
+  alpha=ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
+## The second -e expression handles DOS-style file names with drive letters.
+  sed -e 's/^[^:]*: / /' \
+      -e 's/^['$alpha']:\/[^:]*: / /' < "$tmpdepfile" >> "$depfile"
+## This next piece of magic avoids the `deleted header file' problem.
+## The problem is that when a header file which appears in a .P file
+## is deleted, the dependency causes make to die (because there is
+## typically no way to rebuild the header).  We avoid this by adding
+## dummy dependencies for each header file.  Too bad gcc doesn't do
+## this for us directly.
+  tr ' ' '
+' < "$tmpdepfile" |
+## Some versions of gcc put a space before the `:'.  On the theory
+## that the space means something, we add a space to the output as
+## well.
+## Some versions of the HPUX 10.20 sed can't process this invocation
+## correctly.  Breaking it into two sed invocations is a workaround.
+    sed -e 's/^\\$//' -e '/^$/d' -e '/:$/d' | sed -e 's/$/ :/' >> "$depfile"
+  rm -f "$tmpdepfile"
+  ;;
+
+hp)
+  # This case exists only to let depend.m4 do its work.  It works by
+  # looking at the text of this script.  This case will never be run,
+  # since it is checked for above.
+  exit 1
+  ;;
+
+sgi)
+  if test "$libtool" = yes; then
+    "$@" "-Wp,-MDupdate,$tmpdepfile"
+  else
+    "$@" -MDupdate "$tmpdepfile"
+  fi
+  stat=$?
+  if test $stat -eq 0; then :
+  else
+    rm -f "$tmpdepfile"
+    exit $stat
+  fi
+  rm -f "$depfile"
+
+  if test -f "$tmpdepfile"; then  # yes, the sourcefile depend on other files
+    echo "$object : \\" > "$depfile"
+
+    # Clip off the initial element (the dependent).  Don't try to be
+    # clever and replace this with sed code, as IRIX sed won't handle
+    # lines with more than a fixed number of characters (4096 in
+    # IRIX 6.2 sed, 8192 in IRIX 6.5).  We also remove comment lines;
+    # the IRIX cc adds comments like `#:fec' to the end of the
+    # dependency line.
+    tr ' ' '
+' < "$tmpdepfile" \
+    | sed -e 's/^.*\.o://' -e 's/#.*$//' -e '/^$/ d' | \
+    tr '
+' ' ' >> $depfile
+    echo >> $depfile
+
+    # The second pass generates a dummy entry for each header file.
+    tr ' ' '
+' < "$tmpdepfile" \
+   | sed -e 's/^.*\.o://' -e 's/#.*$//' -e '/^$/ d' -e 's/$/:/' \
+   >> $depfile
+  else
+    # The sourcefile does not contain any dependencies, so just
+    # store a dummy comment line, to avoid errors with the Makefile
+    # "include basename.Plo" scheme.
+    echo "#dummy" > "$depfile"
+  fi
+  rm -f "$tmpdepfile"
+  ;;
+
+aix)
+  # The C for AIX Compiler uses -M and outputs the dependencies
+  # in a .u file.  In older versions, this file always lives in the
+  # current directory.  Also, the AIX compiler puts `$object:' at the
+  # start of each line; $object doesn't have directory information.
+  # Version 6 uses the directory in both cases.
+  dir=`echo "$object" | sed -e 's|/[^/]*$|/|'`
+  test "x$dir" = "x$object" && dir=
+  base=`echo "$object" | sed -e 's|^.*/||' -e 's/\.o$//' -e 's/\.lo$//'`
+  if test "$libtool" = yes; then
+    tmpdepfile1=$dir$base.u
+    tmpdepfile2=$base.u
+    tmpdepfile3=$dir.libs/$base.u
+    "$@" -Wc,-M
+  else
+    tmpdepfile1=$dir$base.u
+    tmpdepfile2=$dir$base.u
+    tmpdepfile3=$dir$base.u
+    "$@" -M
+  fi
+  stat=$?
+
+  if test $stat -eq 0; then :
+  else
+    rm -f "$tmpdepfile1" "$tmpdepfile2" "$tmpdepfile3"
+    exit $stat
+  fi
+
+  for tmpdepfile in "$tmpdepfile1" "$tmpdepfile2" "$tmpdepfile3"
+  do
+    test -f "$tmpdepfile" && break
+  done
+  if test -f "$tmpdepfile"; then
+    # Each line is of the form `foo.o: dependent.h'.
+    # Do two passes, one to just change these to
+    # `$object: dependent.h' and one to simply `dependent.h:'.
+    sed -e "s,^.*\.[a-z]*:,$object:," < "$tmpdepfile" > "$depfile"
+    # That's a tab and a space in the [].
+    sed -e 's,^.*\.[a-z]*:[	 ]*,,' -e 's,$,:,' < "$tmpdepfile" >> "$depfile"
+  else
+    # The sourcefile does not contain any dependencies, so just
+    # store a dummy comment line, to avoid errors with the Makefile
+    # "include basename.Plo" scheme.
+    echo "#dummy" > "$depfile"
+  fi
+  rm -f "$tmpdepfile"
+  ;;
+
+icc)
+  # Intel's C compiler understands `-MD -MF file'.  However on
+  #    icc -MD -MF foo.d -c -o sub/foo.o sub/foo.c
+  # ICC 7.0 will fill foo.d with something like
+  #    foo.o: sub/foo.c
+  #    foo.o: sub/foo.h
+  # which is wrong.  We want:
+  #    sub/foo.o: sub/foo.c
+  #    sub/foo.o: sub/foo.h
+  #    sub/foo.c:
+  #    sub/foo.h:
+  # ICC 7.1 will output
+  #    foo.o: sub/foo.c sub/foo.h
+  # and will wrap long lines using \ :
+  #    foo.o: sub/foo.c ... \
+  #     sub/foo.h ... \
+  #     ...
+
+  "$@" -MD -MF "$tmpdepfile"
+  stat=$?
+  if test $stat -eq 0; then :
+  else
+    rm -f "$tmpdepfile"
+    exit $stat
+  fi
+  rm -f "$depfile"
+  # Each line is of the form `foo.o: dependent.h',
+  # or `foo.o: dep1.h dep2.h \', or ` dep3.h dep4.h \'.
+  # Do two passes, one to just change these to
+  # `$object: dependent.h' and one to simply `dependent.h:'.
+  sed "s,^[^:]*:,$object :," < "$tmpdepfile" > "$depfile"
+  # Some versions of the HPUX 10.20 sed can't process this invocation
+  # correctly.  Breaking it into two sed invocations is a workaround.
+  sed 's,^[^:]*: \(.*\)$,\1,;s/^\\$//;/^$/d;/:$/d' < "$tmpdepfile" |
+    sed -e 's/$/ :/' >> "$depfile"
+  rm -f "$tmpdepfile"
+  ;;
+
+hp2)
+  # The "hp" stanza above does not work with aCC (C++) and HP's ia64
+  # compilers, which have integrated preprocessors.  The correct option
+  # to use with these is +Maked; it writes dependencies to a file named
+  # 'foo.d', which lands next to the object file, wherever that
+  # happens to be.
+  # Much of this is similar to the tru64 case; see comments there.
+  dir=`echo "$object" | sed -e 's|/[^/]*$|/|'`
+  test "x$dir" = "x$object" && dir=
+  base=`echo "$object" | sed -e 's|^.*/||' -e 's/\.o$//' -e 's/\.lo$//'`
+  if test "$libtool" = yes; then
+    tmpdepfile1=$dir$base.d
+    tmpdepfile2=$dir.libs/$base.d
+    "$@" -Wc,+Maked
+  else
+    tmpdepfile1=$dir$base.d
+    tmpdepfile2=$dir$base.d
+    "$@" +Maked
+  fi
+  stat=$?
+  if test $stat -eq 0; then :
+  else
+     rm -f "$tmpdepfile1" "$tmpdepfile2"
+     exit $stat
+  fi
+
+  for tmpdepfile in "$tmpdepfile1" "$tmpdepfile2"
+  do
+    test -f "$tmpdepfile" && break
+  done
+  if test -f "$tmpdepfile"; then
+    sed -e "s,^.*\.[a-z]*:,$object:," "$tmpdepfile" > "$depfile"
+    # Add `dependent.h:' lines.
+    sed -ne '2,${; s/^ *//; s/ \\*$//; s/$/:/; p;}' "$tmpdepfile" >> "$depfile"
+  else
+    echo "#dummy" > "$depfile"
+  fi
+  rm -f "$tmpdepfile" "$tmpdepfile2"
+  ;;
+
+tru64)
+   # The Tru64 compiler uses -MD to generate dependencies as a side
+   # effect.  `cc -MD -o foo.o ...' puts the dependencies into `foo.o.d'.
+   # At least on Alpha/Redhat 6.1, Compaq CCC V6.2-504 seems to put
+   # dependencies in `foo.d' instead, so we check for that too.
+   # Subdirectories are respected.
+   dir=`echo "$object" | sed -e 's|/[^/]*$|/|'`
+   test "x$dir" = "x$object" && dir=
+   base=`echo "$object" | sed -e 's|^.*/||' -e 's/\.o$//' -e 's/\.lo$//'`
+
+   if test "$libtool" = yes; then
+      # With Tru64 cc, shared objects can also be used to make a
+      # static library.  This mechanism is used in libtool 1.4 series to
+      # handle both shared and static libraries in a single compilation.
+      # With libtool 1.4, dependencies were output in $dir.libs/$base.lo.d.
+      #
+      # With libtool 1.5 this exception was removed, and libtool now
+      # generates 2 separate objects for the 2 libraries.  These two
+      # compilations output dependencies in $dir.libs/$base.o.d and
+      # in $dir$base.o.d.  We have to check for both files, because
+      # one of the two compilations can be disabled.  We should prefer
+      # $dir$base.o.d over $dir.libs/$base.o.d because the latter is
+      # automatically cleaned when .libs/ is deleted, while ignoring
+      # the former would cause a distcleancheck panic.
+      tmpdepfile1=$dir.libs/$base.lo.d   # libtool 1.4
+      tmpdepfile2=$dir$base.o.d          # libtool 1.5
+      tmpdepfile3=$dir.libs/$base.o.d    # libtool 1.5
+      tmpdepfile4=$dir.libs/$base.d      # Compaq CCC V6.2-504
+      "$@" -Wc,-MD
+   else
+      tmpdepfile1=$dir$base.o.d
+      tmpdepfile2=$dir$base.d
+      tmpdepfile3=$dir$base.d
+      tmpdepfile4=$dir$base.d
+      "$@" -MD
+   fi
+
+   stat=$?
+   if test $stat -eq 0; then :
+   else
+      rm -f "$tmpdepfile1" "$tmpdepfile2" "$tmpdepfile3" "$tmpdepfile4"
+      exit $stat
+   fi
+
+   for tmpdepfile in "$tmpdepfile1" "$tmpdepfile2" "$tmpdepfile3" "$tmpdepfile4"
+   do
+     test -f "$tmpdepfile" && break
+   done
+   if test -f "$tmpdepfile"; then
+      sed -e "s,^.*\.[a-z]*:,$object:," < "$tmpdepfile" > "$depfile"
+      # That's a tab and a space in the [].
+      sed -e 's,^.*\.[a-z]*:[	 ]*,,' -e 's,$,:,' < "$tmpdepfile" >> "$depfile"
+   else
+      echo "#dummy" > "$depfile"
+   fi
+   rm -f "$tmpdepfile"
+   ;;
+
+#nosideeffect)
+  # This comment above is used by automake to tell side-effect
+  # dependency tracking mechanisms from slower ones.
+
+dashmstdout)
+  # Important note: in order to support this mode, a compiler *must*
+  # always write the preprocessed file to stdout, regardless of -o.
+  "$@" || exit $?
+
+  # Remove the call to Libtool.
+  if test "$libtool" = yes; then
+    while test $1 != '--mode=compile'; do
+      shift
+    done
+    shift
+  fi
+
+  # Remove `-o $object'.
+  IFS=" "
+  for arg
+  do
+    case $arg in
+    -o)
+      shift
+      ;;
+    $object)
+      shift
+      ;;
+    *)
+      set fnord "$@" "$arg"
+      shift # fnord
+      shift # $arg
+      ;;
+    esac
+  done
+
+  test -z "$dashmflag" && dashmflag=-M
+  # Require at least two characters before searching for `:'
+  # in the target name.  This is to cope with DOS-style filenames:
+  # a dependency such as `c:/foo/bar' could be seen as target `c' otherwise.
+  "$@" $dashmflag |
+    sed 's:^[  ]*[^: ][^:][^:]*\:[    ]*:'"$object"'\: :' > "$tmpdepfile"
+  rm -f "$depfile"
+  cat < "$tmpdepfile" > "$depfile"
+  tr ' ' '
+' < "$tmpdepfile" | \
+## Some versions of the HPUX 10.20 sed can't process this invocation
+## correctly.  Breaking it into two sed invocations is a workaround.
+    sed -e 's/^\\$//' -e '/^$/d' -e '/:$/d' | sed -e 's/$/ :/' >> "$depfile"
+  rm -f "$tmpdepfile"
+  ;;
+
+dashXmstdout)
+  # This case only exists to satisfy depend.m4.  It is never actually
+  # run, as this mode is specially recognized in the preamble.
+  exit 1
+  ;;
+
+makedepend)
+  "$@" || exit $?
+  # Remove any Libtool call
+  if test "$libtool" = yes; then
+    while test $1 != '--mode=compile'; do
+      shift
+    done
+    shift
+  fi
+  # X makedepend
+  shift
+  cleared=no
+  for arg in "$@"; do
+    case $cleared in
+    no)
+      set ""; shift
+      cleared=yes ;;
+    esac
+    case "$arg" in
+    -D*|-I*)
+      set fnord "$@" "$arg"; shift ;;
+    # Strip any option that makedepend may not understand.  Remove
+    # the object too, otherwise makedepend will parse it as a source file.
+    -*|$object)
+      ;;
+    *)
+      set fnord "$@" "$arg"; shift ;;
+    esac
+  done
+  obj_suffix="`echo $object | sed 's/^.*\././'`"
+  touch "$tmpdepfile"
+  ${MAKEDEPEND-makedepend} -o"$obj_suffix" -f"$tmpdepfile" "$@"
+  rm -f "$depfile"
+  cat < "$tmpdepfile" > "$depfile"
+  sed '1,2d' "$tmpdepfile" | tr ' ' '
+' | \
+## Some versions of the HPUX 10.20 sed can't process this invocation
+## correctly.  Breaking it into two sed invocations is a workaround.
+    sed -e 's/^\\$//' -e '/^$/d' -e '/:$/d' | sed -e 's/$/ :/' >> "$depfile"
+  rm -f "$tmpdepfile" "$tmpdepfile".bak
+  ;;
+
+cpp)
+  # Important note: in order to support this mode, a compiler *must*
+  # always write the preprocessed file to stdout.
+  "$@" || exit $?
+
+  # Remove the call to Libtool.
+  if test "$libtool" = yes; then
+    while test $1 != '--mode=compile'; do
+      shift
+    done
+    shift
+  fi
+
+  # Remove `-o $object'.
+  IFS=" "
+  for arg
+  do
+    case $arg in
+    -o)
+      shift
+      ;;
+    $object)
+      shift
+      ;;
+    *)
+      set fnord "$@" "$arg"
+      shift # fnord
+      shift # $arg
+      ;;
+    esac
+  done
+
+  "$@" -E |
+    sed -n -e '/^# [0-9][0-9]* "\([^"]*\)".*/ s:: \1 \\:p' \
+       -e '/^#line [0-9][0-9]* "\([^"]*\)".*/ s:: \1 \\:p' |
+    sed '$ s: \\$::' > "$tmpdepfile"
+  rm -f "$depfile"
+  echo "$object : \\" > "$depfile"
+  cat < "$tmpdepfile" >> "$depfile"
+  sed < "$tmpdepfile" '/^$/d;s/^ //;s/ \\$//;s/$/ :/' >> "$depfile"
+  rm -f "$tmpdepfile"
+  ;;
+
+msvisualcpp)
+  # Important note: in order to support this mode, a compiler *must*
+  # always write the preprocessed file to stdout, regardless of -o,
+  # because we must use -o when running libtool.
+  "$@" || exit $?
+  IFS=" "
+  for arg
+  do
+    case "$arg" in
+    "-Gm"|"/Gm"|"-Gi"|"/Gi"|"-ZI"|"/ZI")
+	set fnord "$@"
+	shift
+	shift
+	;;
+    *)
+	set fnord "$@" "$arg"
+	shift
+	shift
+	;;
+    esac
+  done
+  "$@" -E |
+  sed -n '/^#line [0-9][0-9]* "\([^"]*\)"/ s::echo "`cygpath -u \\"\1\\"`":p' | sort | uniq > "$tmpdepfile"
+  rm -f "$depfile"
+  echo "$object : \\" > "$depfile"
+  . "$tmpdepfile" | sed 's% %\\ %g' | sed -n '/^\(.*\)$/ s::	\1 \\:p' >> "$depfile"
+  echo "	" >> "$depfile"
+  . "$tmpdepfile" | sed 's% %\\ %g' | sed -n '/^\(.*\)$/ s::\1\::p' >> "$depfile"
+  rm -f "$tmpdepfile"
+  ;;
+
+none)
+  exec "$@"
+  ;;
+
+*)
+  echo "Unknown depmode $depmode" 1>&2
+  exit 1
+  ;;
+esac
+
+exit 0
+
+# Local Variables:
+# mode: shell-script
+# sh-indentation: 2
+# eval: (add-hook 'write-file-hooks 'time-stamp)
+# time-stamp-start: "scriptversion="
+# time-stamp-format: "%:y-%02m-%02d.%02H"
+# time-stamp-end: "$"
+# End:

example.c

@@ -1,7 +1,13 @@
 
 #if 0 /* in case someone actually tries to compile this */
 
-/* example.c - an example of using libpng */
+/* example.c - an example of using libpng
+ * Last changed in libpng 1.2.1 December 7, 2001.
+ * This file has been placed in the public domain by the authors.
+ * Maintained 1998-2007 Glenn Randers-Pehrson
+ * Maintained 1996, 1997 Andreas Dilger)
+ * Written 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ */
 
 /* This is an example of how to use libpng to read and write PNG files.
  * The file libpng.txt is much more verbose then this.  If you have not
@@ -194,7 +200,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
 
    /* Expand paletted colors into true RGB triplets */
    if (color_type == PNG_COLOR_TYPE_PALETTE)
-      png_set_palette_rgb(png_ptr);
+      png_set_palette_to_rgb(png_ptr);
 
    /* Expand grayscale images to the full 8 bits from 1, 2, or 4 bits/pixel */
    if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
@@ -490,10 +496,10 @@ row_callback(png_structp png_ptr, png_bytep new_row,
  * In this function you will receive a pointer to new row data from
  * libpng called new_row that is to replace a corresponding row (of
  * the same data format) in a buffer allocated by your application.
- * 
+ *
  * The new row data pointer new_row may be NULL, indicating there is
  * no new data to be replaced (in cases of interlace loading).
- * 
+ *
  * If new_row is not NULL then you need to call
  * png_progressive_combine_row() to replace the corresponding row as
  * shown below:

install-sh

@@ -0,0 +1,519 @@
+#!/bin/sh
+# install - install a program, script, or datafile
+
+scriptversion=2006-12-25.00
+
+# This originates from X11R5 (mit/util/scripts/install.sh), which was
+# later released in X11R6 (xc/config/util/install.sh) with the
+# following copyright and license.
+#
+# Copyright (C) 1994 X Consortium
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to
+# deal in the Software without restriction, including without limitation the
+# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+# sell copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+# X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+# AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNEC-
+# TION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#
+# Except as contained in this notice, the name of the X Consortium shall not
+# be used in advertising or otherwise to promote the sale, use or other deal-
+# ings in this Software without prior written authorization from the X Consor-
+# tium.
+#
+#
+# FSF changes to this file are in the public domain.
+#
+# Calling this script install-sh is preferred over install.sh, to prevent
+# `make' implicit rules from creating a file called install from it
+# when there is no Makefile.
+#
+# This script is compatible with the BSD install script, but was written
+# from scratch.
+
+nl='
+'
+IFS=" ""	$nl"
+
+# set DOITPROG to echo to test this script
+
+# Don't use :- since 4.3BSD and earlier shells don't like it.
+doit=${DOITPROG-}
+if test -z "$doit"; then
+  doit_exec=exec
+else
+  doit_exec=$doit
+fi
+
+# Put in absolute file names if you don't have them in your path;
+# or use environment vars.
+
+chgrpprog=${CHGRPPROG-chgrp}
+chmodprog=${CHMODPROG-chmod}
+chownprog=${CHOWNPROG-chown}
+cmpprog=${CMPPROG-cmp}
+cpprog=${CPPROG-cp}
+mkdirprog=${MKDIRPROG-mkdir}
+mvprog=${MVPROG-mv}
+rmprog=${RMPROG-rm}
+stripprog=${STRIPPROG-strip}
+
+posix_glob='?'
+initialize_posix_glob='
+  test "$posix_glob" != "?" || {
+    if (set -f) 2>/dev/null; then
+      posix_glob=
+    else
+      posix_glob=:
+    fi
+  }
+'
+
+posix_mkdir=
+
+# Desired mode of installed file.
+mode=0755
+
+chgrpcmd=
+chmodcmd=$chmodprog
+chowncmd=
+mvcmd=$mvprog
+rmcmd="$rmprog -f"
+stripcmd=
+
+src=
+dst=
+dir_arg=
+dst_arg=
+
+copy_on_change=false
+no_target_directory=
+
+usage="\
+Usage: $0 [OPTION]... [-T] SRCFILE DSTFILE
+   or: $0 [OPTION]... SRCFILES... DIRECTORY
+   or: $0 [OPTION]... -t DIRECTORY SRCFILES...
+   or: $0 [OPTION]... -d DIRECTORIES...
+
+In the 1st form, copy SRCFILE to DSTFILE.
+In the 2nd and 3rd, copy all SRCFILES to DIRECTORY.
+In the 4th, create DIRECTORIES.
+
+Options:
+     --help     display this help and exit.
+     --version  display version info and exit.
+
+  -c            (ignored)
+  -C            install only if different (preserve the last data modification time)
+  -d            create directories instead of installing files.
+  -g GROUP      $chgrpprog installed files to GROUP.
+  -m MODE       $chmodprog installed files to MODE.
+  -o USER       $chownprog installed files to USER.
+  -s            $stripprog installed files.
+  -t DIRECTORY  install into DIRECTORY.
+  -T            report an error if DSTFILE is a directory.
+
+Environment variables override the default commands:
+  CHGRPPROG CHMODPROG CHOWNPROG CMPPROG CPPROG MKDIRPROG MVPROG
+  RMPROG STRIPPROG
+"
+
+while test $# -ne 0; do
+  case $1 in
+    -c) ;;
+
+    -C) copy_on_change=true;;
+
+    -d) dir_arg=true;;
+
+    -g) chgrpcmd="$chgrpprog $2"
+	shift;;
+
+    --help) echo "$usage"; exit $?;;
+
+    -m) mode=$2
+	case $mode in
+	  *' '* | *'	'* | *'
+'*	  | *'*'* | *'?'* | *'['*)
+	    echo "$0: invalid mode: $mode" >&2
+	    exit 1;;
+	esac
+	shift;;
+
+    -o) chowncmd="$chownprog $2"
+	shift;;
+
+    -s) stripcmd=$stripprog;;
+
+    -t) dst_arg=$2
+	shift;;
+
+    -T) no_target_directory=true;;
+
+    --version) echo "$0 $scriptversion"; exit $?;;
+
+    --)	shift
+	break;;
+
+    -*)	echo "$0: invalid option: $1" >&2
+	exit 1;;
+
+    *)  break;;
+  esac
+  shift
+done
+
+if test $# -ne 0 && test -z "$dir_arg$dst_arg"; then
+  # When -d is used, all remaining arguments are directories to create.
+  # When -t is used, the destination is already specified.
+  # Otherwise, the last argument is the destination.  Remove it from $@.
+  for arg
+  do
+    if test -n "$dst_arg"; then
+      # $@ is not empty: it contains at least $arg.
+      set fnord "$@" "$dst_arg"
+      shift # fnord
+    fi
+    shift # arg
+    dst_arg=$arg
+  done
+fi
+
+if test $# -eq 0; then
+  if test -z "$dir_arg"; then
+    echo "$0: no input file specified." >&2
+    exit 1
+  fi
+  # It's OK to call `install-sh -d' without argument.
+  # This can happen when creating conditional directories.
+  exit 0
+fi
+
+if test -z "$dir_arg"; then
+  trap '(exit $?); exit' 1 2 13 15
+
+  # Set umask so as not to create temps with too-generous modes.
+  # However, 'strip' requires both read and write access to temps.
+  case $mode in
+    # Optimize common cases.
+    *644) cp_umask=133;;
+    *755) cp_umask=22;;
+
+    *[0-7])
+      if test -z "$stripcmd"; then
+	u_plus_rw=
+      else
+	u_plus_rw='% 200'
+      fi
+      cp_umask=`expr '(' 777 - $mode % 1000 ')' $u_plus_rw`;;
+    *)
+      if test -z "$stripcmd"; then
+	u_plus_rw=
+      else
+	u_plus_rw=,u+rw
+      fi
+      cp_umask=$mode$u_plus_rw;;
+  esac
+fi
+
+for src
+do
+  # Protect names starting with `-'.
+  case $src in
+    -*) src=./$src;;
+  esac
+
+  if test -n "$dir_arg"; then
+    dst=$src
+    dstdir=$dst
+    test -d "$dstdir"
+    dstdir_status=$?
+  else
+
+    # Waiting for this to be detected by the "$cpprog $src $dsttmp" command
+    # might cause directories to be created, which would be especially bad
+    # if $src (and thus $dsttmp) contains '*'.
+    if test ! -f "$src" && test ! -d "$src"; then
+      echo "$0: $src does not exist." >&2
+      exit 1
+    fi
+
+    if test -z "$dst_arg"; then
+      echo "$0: no destination specified." >&2
+      exit 1
+    fi
+
+    dst=$dst_arg
+    # Protect names starting with `-'.
+    case $dst in
+      -*) dst=./$dst;;
+    esac
+
+    # If destination is a directory, append the input filename; won't work
+    # if double slashes aren't ignored.
+    if test -d "$dst"; then
+      if test -n "$no_target_directory"; then
+	echo "$0: $dst_arg: Is a directory" >&2
+	exit 1
+      fi
+      dstdir=$dst
+      dst=$dstdir/`basename "$src"`
+      dstdir_status=0
+    else
+      # Prefer dirname, but fall back on a substitute if dirname fails.
+      dstdir=`
+	(dirname "$dst") 2>/dev/null ||
+	expr X"$dst" : 'X\(.*[^/]\)//*[^/][^/]*/*$' \| \
+	     X"$dst" : 'X\(//\)[^/]' \| \
+	     X"$dst" : 'X\(//\)$' \| \
+	     X"$dst" : 'X\(/\)' \| . 2>/dev/null ||
+	echo X"$dst" |
+	    sed '/^X\(.*[^/]\)\/\/*[^/][^/]*\/*$/{
+		   s//\1/
+		   q
+		 }
+		 /^X\(\/\/\)[^/].*/{
+		   s//\1/
+		   q
+		 }
+		 /^X\(\/\/\)$/{
+		   s//\1/
+		   q
+		 }
+		 /^X\(\/\).*/{
+		   s//\1/
+		   q
+		 }
+		 s/.*/./; q'
+      `
+
+      test -d "$dstdir"
+      dstdir_status=$?
+    fi
+  fi
+
+  obsolete_mkdir_used=false
+
+  if test $dstdir_status != 0; then
+    case $posix_mkdir in
+      '')
+	# Create intermediate dirs using mode 755 as modified by the umask.
+	# This is like FreeBSD 'install' as of 1997-10-28.
+	umask=`umask`
+	case $stripcmd.$umask in
+	  # Optimize common cases.
+	  *[2367][2367]) mkdir_umask=$umask;;
+	  .*0[02][02] | .[02][02] | .[02]) mkdir_umask=22;;
+
+	  *[0-7])
+	    mkdir_umask=`expr $umask + 22 \
+	      - $umask % 100 % 40 + $umask % 20 \
+	      - $umask % 10 % 4 + $umask % 2
+	    `;;
+	  *) mkdir_umask=$umask,go-w;;
+	esac
+
+	# With -d, create the new directory with the user-specified mode.
+	# Otherwise, rely on $mkdir_umask.
+	if test -n "$dir_arg"; then
+	  mkdir_mode=-m$mode
+	else
+	  mkdir_mode=
+	fi
+
+	posix_mkdir=false
+	case $umask in
+	  *[123567][0-7][0-7])
+	    # POSIX mkdir -p sets u+wx bits regardless of umask, which
+	    # is incompatible with FreeBSD 'install' when (umask & 300) != 0.
+	    ;;
+	  *)
+	    tmpdir=${TMPDIR-/tmp}/ins$RANDOM-$$
+	    trap 'ret=$?; rmdir "$tmpdir/d" "$tmpdir" 2>/dev/null; exit $ret' 0
+
+	    if (umask $mkdir_umask &&
+		exec $mkdirprog $mkdir_mode -p -- "$tmpdir/d") >/dev/null 2>&1
+	    then
+	      if test -z "$dir_arg" || {
+		   # Check for POSIX incompatibilities with -m.
+		   # HP-UX 11.23 and IRIX 6.5 mkdir -m -p sets group- or
+		   # other-writeable bit of parent directory when it shouldn't.
+		   # FreeBSD 6.1 mkdir -m -p sets mode of existing directory.
+		   ls_ld_tmpdir=`ls -ld "$tmpdir"`
+		   case $ls_ld_tmpdir in
+		     d????-?r-*) different_mode=700;;
+		     d????-?--*) different_mode=755;;
+		     *) false;;
+		   esac &&
+		   $mkdirprog -m$different_mode -p -- "$tmpdir" && {
+		     ls_ld_tmpdir_1=`ls -ld "$tmpdir"`
+		     test "$ls_ld_tmpdir" = "$ls_ld_tmpdir_1"
+		   }
+		 }
+	      then posix_mkdir=:
+	      fi
+	      rmdir "$tmpdir/d" "$tmpdir"
+	    else
+	      # Remove any dirs left behind by ancient mkdir implementations.
+	      rmdir ./$mkdir_mode ./-p ./-- 2>/dev/null
+	    fi
+	    trap '' 0;;
+	esac;;
+    esac
+
+    if
+      $posix_mkdir && (
+	umask $mkdir_umask &&
+	$doit_exec $mkdirprog $mkdir_mode -p -- "$dstdir"
+      )
+    then :
+    else
+
+      # The umask is ridiculous, or mkdir does not conform to POSIX,
+      # or it failed possibly due to a race condition.  Create the
+      # directory the slow way, step by step, checking for races as we go.
+
+      case $dstdir in
+	/*) prefix='/';;
+	-*) prefix='./';;
+	*)  prefix='';;
+      esac
+
+      eval "$initialize_posix_glob"
+
+      oIFS=$IFS
+      IFS=/
+      $posix_glob set -f
+      set fnord $dstdir
+      shift
+      $posix_glob set +f
+      IFS=$oIFS
+
+      prefixes=
+
+      for d
+      do
+	test -z "$d" && continue
+
+	prefix=$prefix$d
+	if test -d "$prefix"; then
+	  prefixes=
+	else
+	  if $posix_mkdir; then
+	    (umask=$mkdir_umask &&
+	     $doit_exec $mkdirprog $mkdir_mode -p -- "$dstdir") && break
+	    # Don't fail if two instances are running concurrently.
+	    test -d "$prefix" || exit 1
+	  else
+	    case $prefix in
+	      *\'*) qprefix=`echo "$prefix" | sed "s/'/'\\\\\\\\''/g"`;;
+	      *) qprefix=$prefix;;
+	    esac
+	    prefixes="$prefixes '$qprefix'"
+	  fi
+	fi
+	prefix=$prefix/
+      done
+
+      if test -n "$prefixes"; then
+	# Don't fail if two instances are running concurrently.
+	(umask $mkdir_umask &&
+	 eval "\$doit_exec \$mkdirprog $prefixes") ||
+	  test -d "$dstdir" || exit 1
+	obsolete_mkdir_used=true
+      fi
+    fi
+  fi
+
+  if test -n "$dir_arg"; then
+    { test -z "$chowncmd" || $doit $chowncmd "$dst"; } &&
+    { test -z "$chgrpcmd" || $doit $chgrpcmd "$dst"; } &&
+    { test "$obsolete_mkdir_used$chowncmd$chgrpcmd" = false ||
+      test -z "$chmodcmd" || $doit $chmodcmd $mode "$dst"; } || exit 1
+  else
+
+    # Make a couple of temp file names in the proper directory.
+    dsttmp=$dstdir/_inst.$$_
+    rmtmp=$dstdir/_rm.$$_
+
+    # Trap to clean up those temp files at exit.
+    trap 'ret=$?; rm -f "$dsttmp" "$rmtmp" && exit $ret' 0
+
+    # Copy the file name to the temp name.
+    (umask $cp_umask && $doit_exec $cpprog "$src" "$dsttmp") &&
+
+    # and set any options; do chmod last to preserve setuid bits.
+    #
+    # If any of these fail, we abort the whole thing.  If we want to
+    # ignore errors from any of these, just make sure not to ignore
+    # errors from the above "$doit $cpprog $src $dsttmp" command.
+    #
+    { test -z "$chowncmd" || $doit $chowncmd "$dsttmp"; } &&
+    { test -z "$chgrpcmd" || $doit $chgrpcmd "$dsttmp"; } &&
+    { test -z "$stripcmd" || $doit $stripcmd "$dsttmp"; } &&
+    { test -z "$chmodcmd" || $doit $chmodcmd $mode "$dsttmp"; } &&
+
+    # If -C, don't bother to copy if it wouldn't change the file.
+    if $copy_on_change &&
+       old=`LC_ALL=C ls -dlL "$dst"	2>/dev/null` &&
+       new=`LC_ALL=C ls -dlL "$dsttmp"	2>/dev/null` &&
+
+       eval "$initialize_posix_glob" &&
+       $posix_glob set -f &&
+       set X $old && old=:$2:$4:$5:$6 &&
+       set X $new && new=:$2:$4:$5:$6 &&
+       $posix_glob set +f &&
+
+       test "$old" = "$new" &&
+       $cmpprog "$dst" "$dsttmp" >/dev/null 2>&1
+    then
+      rm -f "$dsttmp"
+    else
+      # Rename the file to the real destination.
+      $doit $mvcmd -f "$dsttmp" "$dst" 2>/dev/null ||
+
+      # The rename failed, perhaps because mv can't rename something else
+      # to itself, or perhaps because mv is so ancient that it does not
+      # support -f.
+      {
+	# Now remove or move aside any old file at destination location.
+	# We try this two ways since rm can't unlink itself on some
+	# systems and the destination file might be busy for other
+	# reasons.  In this case, the final cleanup might fail but the new
+	# file should still install successfully.
+	{
+	  test ! -f "$dst" ||
+	  $doit $rmcmd -f "$dst" 2>/dev/null ||
+	  { $doit $mvcmd -f "$dst" "$rmtmp" 2>/dev/null &&
+	    { $doit $rmcmd -f "$rmtmp" 2>/dev/null; :; }
+	  } ||
+	  { echo "$0: cannot unlink or rename $dst" >&2
+	    (exit 1); exit 1
+	  }
+	} &&
+
+	# Now rename the file to the real destination.
+	$doit $mvcmd "$dsttmp" "$dst"
+      }
+    fi || exit 1
+
+    trap '' 0
+  fi
+done
+
+# Local variables:
+# eval: (add-hook 'write-file-hooks 'time-stamp)
+# time-stamp-start: "scriptversion="
+# time-stamp-format: "%:y-%02m-%02d.%02H"
+# time-stamp-end: "$"
+# End:

libpng-1.0.37.txt

@@ -1,13 +1,17 @@
 libpng.txt - A description on how to use and modify libpng
 
- libpng version 1.2.8beta1 - November 1, 2004
+ libpng version 1.0.37 - May 9, 2008
  Updated and distributed by Glenn Randers-Pehrson
- <glennrp@users.sourceforge.net>
- Copyright (c) 1998-2004 Glenn Randers-Pehrson
+ <glennrp at users.sourceforge.net>
+ Copyright (c) 1998-2008 Glenn Randers-Pehrson
  For conditions of distribution and use, see copyright
  notice in png.h.
 
- based on:
+ Based on:
+
+ libpng versions 0.97, January 1998, through 1.0.37 - May 9, 2008
+ Updated and distributed by Glenn Randers-Pehrson
+ Copyright (c) 1998-2008 Glenn Randers-Pehrson
 
  libpng 1.0 beta 6  version 0.96 May 28, 1997
  Updated and distributed by Andreas Dilger
@@ -33,6 +37,10 @@ it is heavily commented and should include everything most people
 will need.  We assume that libpng is already installed; see the
 INSTALL file for instructions on how to install libpng.
 
+For examples of libpng usage, see the files "example.c", "pngtest.c",
+and the files in the "contrib" directory, all of which are included in the
+libpng distribution.
+
 Libpng was written as a companion to the PNG specification, as a way
 of reducing the amount of time and effort it takes to support the PNG
 file format in application programs.
@@ -43,12 +51,14 @@ a W3C Recommendation and as an ISO Standard (ISO/IEC 15948:2003 (E)) at
 The W3C and ISO documents have identical technical content.
 
 The PNG-1.2 specification is available at
-<http://www.libpng.org/pub/png/documents/>
+<http://www.libpng.org/pub/png/documents/>.  It is technically equivalent
+to the PNG specification (second edition) but has some additional material.
 
 The PNG-1.0 specification is available
 as RFC 2083 <http://www.libpng.org/pub/png/documents/> and as a
-W3C Recommendation <http://www.w3.org/TR/REC.png.html>. Some
-additional chunks are described in the special-purpose public chunks
+W3C Recommendation <http://www.w3.org/TR/REC.png.html>.
+
+Some additional chunks are described in the special-purpose public chunks
 documents at <http://www.libpng.org/pub/png/documents/>.
 
 Other information
@@ -82,9 +92,7 @@ Libpng is thread safe, provided the threads are using different
 instances of the structures.  Each thread should have its own
 png_struct and png_info instances, and thus its own image.
 Libpng does not protect itself against two threads using the
-same instance of a structure.  Note: thread safety may be defeated
-by use of some of the MMX assembler code in pnggccrd.c, which is only
-compiled when the user defines PNG_THREAD_UNSAFE_OK.
+same instance of a structure.
 
 II. Structures
 
@@ -258,15 +266,19 @@ input stream. You must supply the function
          png_unknown_chunkp chunk);
     {
        /* The unknown chunk structure contains your
-          chunk data: */
+          chunk data, along with similar data for any other
+          unknown chunks: */
+
            png_byte name[5];
            png_byte *data;
            png_size_t size;
+
        /* Note that libpng has already taken care of
           the CRC handling */
 
-       /* put your code here.  Return one of the
-          following: */
+       /* put your code here.  Search for your chunk in the
+          unknown chunk structure, process it, and return one
+          of the following: */
 
        return (-n); /* chunk had an error */
        return (0); /* did not recognize */
@@ -286,6 +298,11 @@ you can retrieve with
 
     png_get_user_chunk_ptr(png_ptr);
 
+If you call the png_set_read_user_chunk_fn() function, then all unknown
+chunks will be saved when read, in case your callback function will need
+one or more of them.  This behavior can be changed with the
+png_set_keep_unknown_chunks() function, described below.
+
 At this point, you can set up a callback function that will be
 called after each row has been read, which you can use to control
 a progress meter or the like.  It's demonstrated in pngtest.c.
@@ -303,40 +320,18 @@ To inform libpng about your function, use
 
     png_set_read_status_fn(png_ptr, read_row_callback);
 
-Width and height limits
-
-The PNG specification allows the width and height of an image to be as
-large as 2^31-1 (0x7fffffff), or about 2.147 billion rows and columns.
-Since very few applications really need to process such large images,
-we have imposed an arbitrary 1-million limit on rows and columns.
-Larger images will be rejected immediately with a png_error() call. If
-you wish to override this limit, you can use
-
-   png_set_user_limits(png_ptr, width_max, height_max);
-
-to set your own limits, or use width_max = height_max = 0x7fffffffL
-to allow all valid dimensions (libpng may reject some very large images
-anyway because of potential buffer overflow conditions).
-
-You should put this statement after you create the PNG structure and
-before calling png_read_info(), png_read_png(), or png_process_data().
-If you need to retrieve the limits that are being applied, use
-
-   width_max = png_get_user_width_max(png_ptr);
-   height_max = png_get_user_height_max(png_ptr);
-
 Unknown-chunk handling
 
 Now you get to set the way the library processes unknown chunks in the
 input PNG stream. Both known and unknown chunks will be read.  Normal
 behavior is that known chunks will be parsed into information in
-various info_ptr members; unknown chunks will be discarded. To change
+various info_ptr members while unknown chunks will be discarded. To change
 this, you can call:
 
     png_set_keep_unknown_chunks(png_ptr, keep,
         chunk_list, num_chunks);
-    keep       - 0: do not handle as unknown
-                 1: do not keep
+    keep       - 0: default unknown chunk handling
+                 1: ignore; do not keep
                  2: keep only if safe-to-copy
                  3: keep even if unsafe-to-copy
                You can use these definitions:
@@ -359,6 +354,37 @@ instances of png_set_keep_unknown_chunks(), the final instance will
 take precedence.  The IHDR and IEND chunks should not be named in
 chunk_list; if they are, libpng will process them normally anyway.
 
+Here is an example of the usage of png_set_keep_unknown_chunks(),
+where the private "vpAg" chunk will later be processed by a user chunk
+callback function:
+
+    png_byte vpAg[5]={118, 112,  65, 103, (png_byte) '\0'};
+
+    #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+      png_byte unused_chunks[]=
+      {
+        104,  73,  83,  84, (png_byte) '\0',   /* hIST */
+        105,  84,  88, 116, (png_byte) '\0',   /* iTXt */
+        112,  67,  65,  76, (png_byte) '\0',   /* pCAL */
+        115,  67,  65,  76, (png_byte) '\0',   /* sCAL */
+        115,  80,  76,  84, (png_byte) '\0',   /* sPLT */
+        116,  73,  77,  69, (png_byte) '\0',   /* tIME */
+      };
+    #endif
+
+    ...
+
+    #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+      /* ignore all unknown chunks: */
+      png_set_keep_unknown_chunks(read_ptr, 1, NULL, 0);
+      /* except for vpAg: */
+      png_set_keep_unknown_chunks(read_ptr, 2, vpAg, 1);
+      /* also ignore unused known chunks: */
+      png_set_keep_unknown_chunks(read_ptr, 1, unused_chunks,
+         (int)sizeof(unused_chunks)/5);
+    #endif
+
+
 The high-level read interface
 
 At this point there are two ways to proceed; through the high-level
@@ -392,7 +418,7 @@ dithering, and setting filler.)  If this is the case, simply do this:
 
     png_read_png(png_ptr, info_ptr, png_transforms, NULL)
 
-where png_transforms is an integer containing the logical OR of
+where png_transforms is an integer containing the bitwise OR of
 some set of transformation flags.  This call is equivalent to png_read_info(),
 followed the set of transformations indicated by the transform mask,
 then png_read_image(), and finally png_read_end().
@@ -767,7 +793,7 @@ unless the library has been told to transform it into another format.
 For example, 4 bit/pixel paletted or grayscale data will be returned
 2 pixels/byte with the leftmost pixel in the high-order bits of the
 byte, unless png_set_packing() is called.  8-bit RGB data will be stored
-in RGB RGB RGB format unless png_set_filler() or png_set_add_alpha()
+in RGB RGB RGB format unless png_set_filler()
 is called to insert filler bytes, either before or after each RGB triplet.
 16-bit RGB data will be returned RRGGBB RRGGBB, with the most significant
 byte of the color value first, unless png_set_strip_16() is called to
@@ -775,7 +801,7 @@ transform it to regular RGB RGB triplets, or png_set_filler() or
 png_set_add alpha() is called to insert filler bytes, either before or
 after each RRGGBB triplet.  Similarly, 8-bit or 16-bit grayscale data can
 be modified with
-png_set_filler(), png_set_add_alpha(), or png_set_strip_16().
+png_set_filler() or png_set_strip_16().
 
 The following code transforms grayscale images of less than 8 to 8 bits,
 changes paletted images to RGB, and adds a full alpha channel if there is
@@ -797,6 +823,7 @@ in libpng version 1.0.4, with the function names expanded to improve code
 readability.  In some future version they may actually do different
 things.
 
+
 PNG can have files with 16 bits per channel.  If you only can handle
 8 bits per channel, this will strip the pixels down to 8 bit.
 
@@ -860,16 +887,7 @@ does not affect images that already have full alpha channels.  To add an
 opaque alpha channel, use filler=0xff or 0xffff and PNG_FILLER_AFTER which
 will generate RGBA pixels.
 
-Note that png_set_filler() does not change the color type.  If you want
-to do that, you can add a true alpha channel with
-
-    if (color_type == PNG_COLOR_TYPE_RGB ||
            color_type == PNG_COLOR_TYPE_GRAY)
-    png_set_add_alpha(png_ptr, filler, PNG_FILLER_AFTER);
-
-where "filler" contains the alpha value to assign to each pixel.
-This function was added in libpng-1.2.7.
-
 If you are reading an image with an alpha channel, and you need the
 data as ARGB instead of the normal PNG format RGBA:
 
@@ -923,7 +941,7 @@ the normalized graylevel is computed:
 
 The default values approximate those recommended in the Charles
 Poynton's Color FAQ, <http://www.inforamp.net/~poynton/>
-Copyright (c) 1998-01-04 Charles Poynton poynton@inforamp.net
+Copyright (c) 1998-01-04 Charles Poynton <poynton at inforamp.net>
 
     Y = 0.212671 * R + 0.715160 * G + 0.072169 * B
 
@@ -1248,8 +1266,8 @@ the second parameter NULL.
 
 Finishing a sequential read
 
-After you are finished reading the image through either the high- or
-low-level interfaces, you can finish reading the file.  If you are
+After you are finished reading the image through the
+low-level interface, you can finish reading the file.  If you are
 interested in comments or time, which may be stored either before or
 after the image data, you should pass the separate png_info struct if
 you want to keep the comments from before and after the image
@@ -1267,7 +1285,7 @@ point to libpng-allocated storage with the following function:
 
     png_free_data(png_ptr, info_ptr, mask, seq)
     mask - identifies data to be freed, a mask
-           containing the logical OR of one or
+           containing the bitwise OR of one or
            more of
              PNG_FREE_PLTE, PNG_FREE_TRNS,
              PNG_FREE_HIST, PNG_FREE_ICCP,
@@ -1329,7 +1347,7 @@ application instead of by libpng, you can use
 
     png_set_invalid(png_ptr, info_ptr, mask);
     mask - identifies the chunks to be made invalid,
-           containing the logical OR of one or
+           containing the bitwise OR of one or
            more of
              PNG_INFO_gAMA, PNG_INFO_sBIT,
              PNG_INFO_cHRM, PNG_INFO_PLTE,
@@ -1596,6 +1614,14 @@ Libpng section below.
 
     png_init_io(png_ptr, fp);
 
+If you are embedding your PNG into a datastream such as MNG, and don't
+want libpng to write the 8-byte signature, or if you have already
+written the signature in your application, use
+
+    png_set_sig_bytes(png_ptr, 8);
+
+to inform libpng that it should not write a signature.
+
 Write callbacks
 
 At this point, you can set up a callback function that will be
@@ -1633,7 +1659,7 @@ types.
 
     /* turn on or off filtering, and/or choose
        specific filters.  You can use either a single
-       PNG_FILTER_VALUE_NAME or the logical OR of one
+       PNG_FILTER_VALUE_NAME or the bitwise OR of one
        or more PNG_FILTER_NAME masks. */
     png_set_filter(png_ptr, 0,
        PNG_FILTER_NONE  | PNG_FILTER_VALUE_NONE |
@@ -1728,6 +1754,11 @@ Some of the more important parts of the png_info are:
                      can also be
                      PNG_INTRAPIXEL_DIFFERENCING)
 
+If you call png_set_IHDR(), the call must appear before any of the
+other png_set_*() functions, which might require access to some of
+the IHDR settings.  The remaining png_set_*() functions can be called
+in any order.
+
     png_set_PLTE(png_ptr, info_ptr, palette,
        num_palette);
     palette        - the palette for the file
@@ -2006,7 +2037,7 @@ png_set_rows() to put image data in the info structure), simply do this:
 
     png_write_png(png_ptr, info_ptr, png_transforms, NULL)
 
-where png_transforms is an integer containing the logical OR of some set of
+where png_transforms is an integer containing the bitwise OR of some set of
 transformation flags.  This call is equivalent to png_write_info(),
 followed the set of transformations indicated by the transform mask,
 then png_write_image(), and finally png_write_end().
@@ -2266,7 +2297,7 @@ point to libpng-allocated storage with the following function:
 
     png_free_data(png_ptr, info_ptr, mask, seq)
     mask  - identifies data to be freed, a mask
-            containing the logical OR of one or
+            containing the bitwise OR of one or
             more of
               PNG_FREE_PLTE, PNG_FREE_TRNS,
               PNG_FREE_HIST, PNG_FREE_ICCP,
@@ -2338,17 +2369,13 @@ For a more compact example of writing a PNG image, see the file example.c.
 
 V. Modifying/Customizing libpng:
 
-There are three issues here.  The first is changing how libpng does
+There are two issues here.  The first is changing how libpng does
 standard things like memory allocation, input/output, and error handling.
 The second deals with more complicated things like adding new chunks,
 adding new transformations, and generally changing how libpng works.
 Both of those are compile-time issues; that is, they are generally
 determined at the time the code is written, and there is rarely a need
-to provide the user with a means of changing them.  The third is a
-run-time issue:  choosing between and/or tuning one or more alternate
-versions of computationally intensive routines; specifically, optimized
-assembly-language (and therefore compiler- and platform-dependent)
-versions.
+to provide the user with a means of changing them.
 
 Memory allocation, input/output, and error handling
 
@@ -2380,6 +2407,9 @@ Your malloc_fn() must return NULL in case of failure.  The png_malloc()
 function will normally call png_error() if it receives a NULL from the
 system memory allocator or from your replacement malloc_fn().
 
+Your free_fn() will never be called with a NULL ptr, since libpng's
+png_free() checks for NULL before calling free_fn().
+
 Input/Output in libpng is done through png_read() and png_write(),
 which currently just call fread() and fwrite().  The FILE * is stored in
 png_struct and is initialized via png_init_io().  If you wish to change
@@ -2459,7 +2489,7 @@ Custom chunks
 If you need to read or write custom chunks, you may need to get deeper
 into the libpng code.  The library now has mechanisms for storing
 and writing chunks of unknown type; you can even declare callbacks
-for custom chunks.  Hoewver, this may not be good enough if the
+for custom chunks.  However, this may not be good enough if the
 library code itself needs to know about interactions between your
 chunk and existing `intrinsic' chunks.
 
@@ -2709,125 +2739,6 @@ When PNG_DEBUG = 1, the macros are defined, but only png_debug statements
 having level = 0 will be printed.  There aren't any such statements in
 this version of libpng, but if you insert some they will be printed.
 
-VI.  Runtime optimization
-
-A new feature in libpng 1.2.0 is the ability to dynamically switch between
-standard and optimized versions of some routines.  Currently these are
-limited to three computationally intensive tasks when reading PNG files:
-decoding row filters, expanding interlacing, and combining interlaced or
-transparent row data with previous row data.  Currently the optimized
-versions are available only for x86 (Intel, AMD, etc.) platforms with
-MMX support, though this may change in future versions.  (For example,
-the non-MMX assembler optimizations for zlib might become similarly
-runtime-selectable in future releases, in which case libpng could be
-extended to support them.  Alternatively, the compile-time choice of
-floating-point versus integer routines for gamma correction might become
-runtime-selectable.)
-
-Because such optimizations tend to be very platform- and compiler-dependent,
-both in how they are written and in how they perform, the new runtime code
-in libpng has been written to allow programs to query, enable, and disable
-either specific optimizations or all such optimizations.  For example, to
-enable all possible optimizations (bearing in mind that some "optimizations"
-may actually run more slowly in rare cases):
-
-    #if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
-       png_uint_32 mask, flags;
-
-       flags = png_get_asm_flags(png_ptr);
-       mask = png_get_asm_flagmask(PNG_SELECT_READ | PNG_SELECT_WRITE);
-       png_set_asm_flags(png_ptr, flags | mask);
-    #endif
-
-To enable only optimizations relevant to reading PNGs, use PNG_SELECT_READ
-by itself when calling png_get_asm_flagmask(); similarly for optimizing
-only writing.  To disable all optimizations:
-
-    #if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
-       flags = png_get_asm_flags(png_ptr);
-       mask = png_get_asm_flagmask(PNG_SELECT_READ | PNG_SELECT_WRITE);
-       png_set_asm_flags(png_ptr, flags & ~mask);
-    #endif
-
-To enable or disable only MMX-related features, use png_get_mmx_flagmask()
-in place of png_get_asm_flagmask().  The mmx version takes one additional
-parameter:
-
-    #if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
-       int selection = PNG_SELECT_READ | PNG_SELECT_WRITE;
-       int compilerID;
-
-       mask = png_get_mmx_flagmask(selection, &compilerID);
-    #endif
-
-On return, compilerID will indicate which version of the MMX assembler
-optimizations was compiled.  Currently two flavors exist:  Microsoft
-Visual C++ (compilerID == 1) and GNU C (a.k.a. gcc/gas, compilerID == 2).
-On non-x86 platforms or on systems compiled without MMX optimizations, a
-value of -1 is used.
-
-Note that both png_get_asm_flagmask() and png_get_mmx_flagmask() return
-all valid, settable optimization bits for the version of the library that's
-currently in use.  In the case of shared (dynamically linked) libraries,
-this may include optimizations that did not exist at the time the code was
-written and compiled.  It is also possible, of course, to enable only known,
-specific optimizations; for example:
-
-    #if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
-       flags = PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  \
-             | PNG_ASM_FLAG_MMX_READ_INTERLACE    \
-             | PNG_ASM_FLAG_MMX_READ_FILTER_SUB   \
-             | PNG_ASM_FLAG_MMX_READ_FILTER_UP    \
-             | PNG_ASM_FLAG_MMX_READ_FILTER_AVG   \
-             | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ;
-       png_set_asm_flags(png_ptr, flags);
-    #endif
-
-This method would enable only the MMX read-optimizations available at the
-time of libpng 1.2.0's release, regardless of whether a later version of
-the DLL were actually being used.  (Also note that these functions did not
-exist in versions older than 1.2.0, so any attempt to run a dynamically
-linked app on such an older version would fail.)
-
-To determine whether the processor supports MMX instructions at all, use
-the png_mmx_support() function:
-
-    #if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
-       mmxsupport = png_mmx_support();
-    #endif
-
-It returns -1 if MMX support is not compiled into libpng, 0 if MMX code
-is compiled but MMX is not supported by the processor, or 1 if MMX support
-is fully available.  Note that png_mmx_support(), png_get_mmx_flagmask(),
-and png_get_asm_flagmask() all may be called without allocating and ini-
-tializing any PNG structures (for example, as part of a usage screen or
-"about" box).
-
-The following code can be used to prevent an application from using the
-thread_unsafe features, even if libpng was built with PNG_THREAD_UNSAFE_OK
-defined:
-
-#if defined(PNG_USE_PNGGCCRD) && defined(PNG_ASSEMBLER_CODE_SUPPORTED) \
-  && defined(PNG_THREAD_UNSAFE_OK)
-    /* Disable thread-unsafe features of pnggccrd */
-    if (png_access_version() >= 10200)
-    {
-      png_uint_32 mmx_disable_mask = 0;
-      png_uint_32 asm_flags;
-
-      mmx_disable_mask |= ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  \
-                          | PNG_ASM_FLAG_MMX_READ_FILTER_SUB   \
-                          | PNG_ASM_FLAG_MMX_READ_FILTER_AVG   \
-                          | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH );
-      asm_flags = png_get_asm_flags(png_ptr);
-      png_set_asm_flags(png_ptr, asm_flags & ~mmx_disable_mask);
-    }
-#endif
-
-For more extensive examples of runtime querying, enabling and disabling
-of optimized features, see contrib/gregbook/readpng2.c in the libpng
-source-code distribution.
-
 VII.  MNG support
 
 The MNG specification (available at http://www.libpng.org/pub/mng) allows
@@ -2836,12 +2747,12 @@ Libpng can support some of these extensions.  To enable them, use the
 png_permit_mng_features() function:
 
    feature_set = png_permit_mng_features(png_ptr, mask)
-   mask is a png_uint_32 containing the logical OR of the
+   mask is a png_uint_32 containing the bitwise OR of the
         features you want to enable.  These include
         PNG_FLAG_MNG_EMPTY_PLTE
         PNG_FLAG_MNG_FILTER_64
         PNG_ALL_MNG_FEATURES
-   feature_set is a png_uint_32 that is the logical AND of
+   feature_set is a png_uint_32 that is the bitwise AND of
       your mask with the set of MNG features that is
       supported by the version of libpng that you are using.
 
@@ -2853,7 +2764,7 @@ or any other MNG chunks; your application must provide its own support for
 them.  You may wish to consider using libmng (available at
 http://www.libmng.com) instead.
 
-VIII.  Changes to Libpng from version 0.88
+VII.  Changes to Libpng from version 0.88
 
 It should be noted that versions of libpng later than 0.96 are not
 distributed by the original libpng author, Guy Schalnat, nor by
@@ -2902,15 +2813,15 @@ application:
 
    png_uint_32 application_vn = PNG_LIBPNG_VER;
 
-IX. Y2K Compliance in libpng
+VIII. Y2K Compliance in libpng
 
-November 1, 2004
+May 9, 2008
 
 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.
 
 This is your unofficial assurance that libpng from version 0.71 and
-upward through 1.2.8beta1 are Y2K compliant.  It is my belief that earlier
+upward through 1.0.37 are Y2K compliant.  It is my belief that earlier
 versions were also Y2K compliant.
 
 Libpng only has three year fields.  One is a 2-byte unsigned integer that

missing

@@ -0,0 +1,367 @@
+#! /bin/sh
+# Common stub for a few missing GNU programs while installing.
+
+scriptversion=2006-05-10.23
+
+# Copyright (C) 1996, 1997, 1999, 2000, 2002, 2003, 2004, 2005, 2006
+#   Free Software Foundation, Inc.
+# Originally by Fran,cois Pinard <pinard@iro.umontreal.ca>, 1996.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301, USA.
+
+# As a special exception to the GNU General Public License, if you
+# distribute this file as part of a program that contains a
+# configuration script generated by Autoconf, you may include it under
+# the same distribution terms that you use for the rest of that program.
+
+if test $# -eq 0; then
+  echo 1>&2 "Try \`$0 --help' for more information"
+  exit 1
+fi
+
+run=:
+sed_output='s/.* --output[ =]\([^ ]*\).*/\1/p'
+sed_minuso='s/.* -o \([^ ]*\).*/\1/p'
+
+# In the cases where this matters, `missing' is being run in the
+# srcdir already.
+if test -f configure.ac; then
+  configure_ac=configure.ac
+else
+  configure_ac=configure.in
+fi
+
+msg="missing on your system"
+
+case $1 in
+--run)
+  # Try to run requested program, and just exit if it succeeds.
+  run=
+  shift
+  "$@" && exit 0
+  # Exit code 63 means version mismatch.  This often happens
+  # when the user try to use an ancient version of a tool on
+  # a file that requires a minimum version.  In this case we
+  # we should proceed has if the program had been absent, or
+  # if --run hadn't been passed.
+  if test $? = 63; then
+    run=:
+    msg="probably too old"
+  fi
+  ;;
+
+  -h|--h|--he|--hel|--help)
+    echo "\
+$0 [OPTION]... PROGRAM [ARGUMENT]...
+
+Handle \`PROGRAM [ARGUMENT]...' for when PROGRAM is missing, or return an
+error status if there is no known handling for PROGRAM.
+
+Options:
+  -h, --help      display this help and exit
+  -v, --version   output version information and exit
+  --run           try to run the given command, and emulate it if it fails
+
+Supported PROGRAM values:
+  aclocal      touch file \`aclocal.m4'
+  autoconf     touch file \`configure'
+  autoheader   touch file \`config.h.in'
+  autom4te     touch the output file, or create a stub one
+  automake     touch all \`Makefile.in' files
+  bison        create \`y.tab.[ch]', if possible, from existing .[ch]
+  flex         create \`lex.yy.c', if possible, from existing .c
+  help2man     touch the output file
+  lex          create \`lex.yy.c', if possible, from existing .c
+  makeinfo     touch the output file
+  tar          try tar, gnutar, gtar, then tar without non-portable flags
+  yacc         create \`y.tab.[ch]', if possible, from existing .[ch]
+
+Send bug reports to <bug-automake@gnu.org>."
+    exit $?
+    ;;
+
+  -v|--v|--ve|--ver|--vers|--versi|--versio|--version)
+    echo "missing $scriptversion (GNU Automake)"
+    exit $?
+    ;;
+
+  -*)
+    echo 1>&2 "$0: Unknown \`$1' option"
+    echo 1>&2 "Try \`$0 --help' for more information"
+    exit 1
+    ;;
+
+esac
+
+# Now exit if we have it, but it failed.  Also exit now if we
+# don't have it and --version was passed (most likely to detect
+# the program).
+case $1 in
+  lex|yacc)
+    # Not GNU programs, they don't have --version.
+    ;;
+
+  tar)
+    if test -n "$run"; then
+       echo 1>&2 "ERROR: \`tar' requires --run"
+       exit 1
+    elif test "x$2" = "x--version" || test "x$2" = "x--help"; then
+       exit 1
+    fi
+    ;;
+
+  *)
+    if test -z "$run" && ($1 --version) > /dev/null 2>&1; then
+       # We have it, but it failed.
+       exit 1
+    elif test "x$2" = "x--version" || test "x$2" = "x--help"; then
+       # Could not run --version or --help.  This is probably someone
+       # running `$TOOL --version' or `$TOOL --help' to check whether
+       # $TOOL exists and not knowing $TOOL uses missing.
+       exit 1
+    fi
+    ;;
+esac
+
+# If it does not exist, or fails to run (possibly an outdated version),
+# try to emulate it.
+case $1 in
+  aclocal*)
+    echo 1>&2 "\
+WARNING: \`$1' is $msg.  You should only need it if
+         you modified \`acinclude.m4' or \`${configure_ac}'.  You might want
+         to install the \`Automake' and \`Perl' packages.  Grab them from
+         any GNU archive site."
+    touch aclocal.m4
+    ;;
+
+  autoconf)
+    echo 1>&2 "\
+WARNING: \`$1' is $msg.  You should only need it if
+         you modified \`${configure_ac}'.  You might want to install the
+         \`Autoconf' and \`GNU m4' packages.  Grab them from any GNU
+         archive site."
+    touch configure
+    ;;
+
+  autoheader)
+    echo 1>&2 "\
+WARNING: \`$1' is $msg.  You should only need it if
+         you modified \`acconfig.h' or \`${configure_ac}'.  You might want
+         to install the \`Autoconf' and \`GNU m4' packages.  Grab them
+         from any GNU archive site."
+    files=`sed -n 's/^[ ]*A[CM]_CONFIG_HEADER(\([^)]*\)).*/\1/p' ${configure_ac}`
+    test -z "$files" && files="config.h"
+    touch_files=
+    for f in $files; do
+      case $f in
+      *:*) touch_files="$touch_files "`echo "$f" |
+				       sed -e 's/^[^:]*://' -e 's/:.*//'`;;
+      *) touch_files="$touch_files $f.in";;
+      esac
+    done
+    touch $touch_files
+    ;;
+
+  automake*)
+    echo 1>&2 "\
+WARNING: \`$1' is $msg.  You should only need it if
+         you modified \`Makefile.am', \`acinclude.m4' or \`${configure_ac}'.
+         You might want to install the \`Automake' and \`Perl' packages.
+         Grab them from any GNU archive site."
+    find . -type f -name Makefile.am -print |
+	   sed 's/\.am$/.in/' |
+	   while read f; do touch "$f"; done
+    ;;
+
+  autom4te)
+    echo 1>&2 "\
+WARNING: \`$1' is needed, but is $msg.
+         You might have modified some files without having the
+         proper tools for further handling them.
+         You can get \`$1' as part of \`Autoconf' from any GNU
+         archive site."
+
+    file=`echo "$*" | sed -n "$sed_output"`
+    test -z "$file" && file=`echo "$*" | sed -n "$sed_minuso"`
+    if test -f "$file"; then
+	touch $file
+    else
+	test -z "$file" || exec >$file
+	echo "#! /bin/sh"
+	echo "# Created by GNU Automake missing as a replacement of"
+	echo "#  $ $@"
+	echo "exit 0"
+	chmod +x $file
+	exit 1
+    fi
+    ;;
+
+  bison|yacc)
+    echo 1>&2 "\
+WARNING: \`$1' $msg.  You should only need it if
+         you modified a \`.y' file.  You may need the \`Bison' package
+         in order for those modifications to take effect.  You can get
+         \`Bison' from any GNU archive site."
+    rm -f y.tab.c y.tab.h
+    if test $# -ne 1; then
+        eval LASTARG="\${$#}"
+	case $LASTARG in
+	*.y)
+	    SRCFILE=`echo "$LASTARG" | sed 's/y$/c/'`
+	    if test -f "$SRCFILE"; then
+	         cp "$SRCFILE" y.tab.c
+	    fi
+	    SRCFILE=`echo "$LASTARG" | sed 's/y$/h/'`
+	    if test -f "$SRCFILE"; then
+	         cp "$SRCFILE" y.tab.h
+	    fi
+	  ;;
+	esac
+    fi
+    if test ! -f y.tab.h; then
+	echo >y.tab.h
+    fi
+    if test ! -f y.tab.c; then
+	echo 'main() { return 0; }' >y.tab.c
+    fi
+    ;;
+
+  lex|flex)
+    echo 1>&2 "\
+WARNING: \`$1' is $msg.  You should only need it if
+         you modified a \`.l' file.  You may need the \`Flex' package
+         in order for those modifications to take effect.  You can get
+         \`Flex' from any GNU archive site."
+    rm -f lex.yy.c
+    if test $# -ne 1; then
+        eval LASTARG="\${$#}"
+	case $LASTARG in
+	*.l)
+	    SRCFILE=`echo "$LASTARG" | sed 's/l$/c/'`
+	    if test -f "$SRCFILE"; then
+	         cp "$SRCFILE" lex.yy.c
+	    fi
+	  ;;
+	esac
+    fi
+    if test ! -f lex.yy.c; then
+	echo 'main() { return 0; }' >lex.yy.c
+    fi
+    ;;
+
+  help2man)
+    echo 1>&2 "\
+WARNING: \`$1' is $msg.  You should only need it if
+	 you modified a dependency of a manual page.  You may need the
+	 \`Help2man' package in order for those modifications to take
+	 effect.  You can get \`Help2man' from any GNU archive site."
+
+    file=`echo "$*" | sed -n "$sed_output"`
+    test -z "$file" && file=`echo "$*" | sed -n "$sed_minuso"`
+    if test -f "$file"; then
+	touch $file
+    else
+	test -z "$file" || exec >$file
+	echo ".ab help2man is required to generate this page"
+	exit 1
+    fi
+    ;;
+
+  makeinfo)
+    echo 1>&2 "\
+WARNING: \`$1' is $msg.  You should only need it if
+         you modified a \`.texi' or \`.texinfo' file, or any other file
+         indirectly affecting the aspect of the manual.  The spurious
+         call might also be the consequence of using a buggy \`make' (AIX,
+         DU, IRIX).  You might want to install the \`Texinfo' package or
+         the \`GNU make' package.  Grab either from any GNU archive site."
+    # The file to touch is that specified with -o ...
+    file=`echo "$*" | sed -n "$sed_output"`
+    test -z "$file" && file=`echo "$*" | sed -n "$sed_minuso"`
+    if test -z "$file"; then
+      # ... or it is the one specified with @setfilename ...
+      infile=`echo "$*" | sed 's/.* \([^ ]*\) *$/\1/'`
+      file=`sed -n '
+	/^@setfilename/{
+	  s/.* \([^ ]*\) *$/\1/
+	  p
+	  q
+	}' $infile`
+      # ... or it is derived from the source name (dir/f.texi becomes f.info)
+      test -z "$file" && file=`echo "$infile" | sed 's,.*/,,;s,.[^.]*$,,'`.info
+    fi
+    # If the file does not exist, the user really needs makeinfo;
+    # let's fail without touching anything.
+    test -f $file || exit 1
+    touch $file
+    ;;
+
+  tar)
+    shift
+
+    # We have already tried tar in the generic part.
+    # Look for gnutar/gtar before invocation to avoid ugly error
+    # messages.
+    if (gnutar --version > /dev/null 2>&1); then
+       gnutar "$@" && exit 0
+    fi
+    if (gtar --version > /dev/null 2>&1); then
+       gtar "$@" && exit 0
+    fi
+    firstarg="$1"
+    if shift; then
+	case $firstarg in
+	*o*)
+	    firstarg=`echo "$firstarg" | sed s/o//`
+	    tar "$firstarg" "$@" && exit 0
+	    ;;
+	esac
+	case $firstarg in
+	*h*)
+	    firstarg=`echo "$firstarg" | sed s/h//`
+	    tar "$firstarg" "$@" && exit 0
+	    ;;
+	esac
+    fi
+
+    echo 1>&2 "\
+WARNING: I can't seem to be able to run \`tar' with the given arguments.
+         You may want to install GNU tar or Free paxutils, or check the
+         command line arguments."
+    exit 1
+    ;;
+
+  *)
+    echo 1>&2 "\
+WARNING: \`$1' is needed, and is $msg.
+         You might have modified some files without having the
+         proper tools for further handling them.  Check the \`README' file,
+         it often tells you about the needed prerequisites for installing
+         this package.  You may also peek at any GNU archive site, in case
+         some other package would contain this missing \`$1' program."
+    exit 1
+    ;;
+esac
+
+exit 0
+
+# Local variables:
+# eval: (add-hook 'write-file-hooks 'time-stamp)
+# time-stamp-start: "scriptversion="
+# time-stamp-format: "%:y-%02m-%02d.%02H"
+# time-stamp-end: "$"
+# End:

mkinstalldirs

@@ -0,0 +1,161 @@
+#! /bin/sh
+# mkinstalldirs --- make directory hierarchy
+
+scriptversion=2006-05-11.19
+
+# Original author: Noah Friedman <friedman@prep.ai.mit.edu>
+# Created: 1993-05-16
+# Public domain.
+#
+# This file is maintained in Automake, please report
+# bugs to <bug-automake@gnu.org> or send patches to
+# <automake-patches@gnu.org>.
+
+nl='
+'
+IFS=" ""	$nl"
+errstatus=0
+dirmode=
+
+usage="\
+Usage: mkinstalldirs [-h] [--help] [--version] [-m MODE] DIR ...
+
+Create each directory DIR (with mode MODE, if specified), including all
+leading file name components.
+
+Report bugs to <bug-automake@gnu.org>."
+
+# process command line arguments
+while test $# -gt 0 ; do
+  case $1 in
+    -h | --help | --h*)         # -h for help
+      echo "$usage"
+      exit $?
+      ;;
+    -m)                         # -m PERM arg
+      shift
+      test $# -eq 0 && { echo "$usage" 1>&2; exit 1; }
+      dirmode=$1
+      shift
+      ;;
+    --version)
+      echo "$0 $scriptversion"
+      exit $?
+      ;;
+    --)                         # stop option processing
+      shift
+      break
+      ;;
+    -*)                         # unknown option
+      echo "$usage" 1>&2
+      exit 1
+      ;;
+    *)                          # first non-opt arg
+      break
+      ;;
+  esac
+done
+
+for file
+do
+  if test -d "$file"; then
+    shift
+  else
+    break
+  fi
+done
+
+case $# in
+  0) exit 0 ;;
+esac
+
+# Solaris 8's mkdir -p isn't thread-safe.  If you mkdir -p a/b and
+# mkdir -p a/c at the same time, both will detect that a is missing,
+# one will create a, then the other will try to create a and die with
+# a "File exists" error.  This is a problem when calling mkinstalldirs
+# from a parallel make.  We use --version in the probe to restrict
+# ourselves to GNU mkdir, which is thread-safe.
+case $dirmode in
+  '')
+    if mkdir -p --version . >/dev/null 2>&1 && test ! -d ./--version; then
+      echo "mkdir -p -- $*"
+      exec mkdir -p -- "$@"
+    else
+      # On NextStep and OpenStep, the `mkdir' command does not
+      # recognize any option.  It will interpret all options as
+      # directories to create, and then abort because `.' already
+      # exists.
+      test -d ./-p && rmdir ./-p
+      test -d ./--version && rmdir ./--version
+    fi
+    ;;
+  *)
+    if mkdir -m "$dirmode" -p --version . >/dev/null 2>&1 &&
+       test ! -d ./--version; then
+      echo "mkdir -m $dirmode -p -- $*"
+      exec mkdir -m "$dirmode" -p -- "$@"
+    else
+      # Clean up after NextStep and OpenStep mkdir.
+      for d in ./-m ./-p ./--version "./$dirmode";
+      do
+        test -d $d && rmdir $d
+      done
+    fi
+    ;;
+esac
+
+for file
+do
+  case $file in
+    /*) pathcomp=/ ;;
+    *)  pathcomp= ;;
+  esac
+  oIFS=$IFS
+  IFS=/
+  set fnord $file
+  shift
+  IFS=$oIFS
+
+  for d
+  do
+    test "x$d" = x && continue
+
+    pathcomp=$pathcomp$d
+    case $pathcomp in
+      -*) pathcomp=./$pathcomp ;;
+    esac
+
+    if test ! -d "$pathcomp"; then
+      echo "mkdir $pathcomp"
+
+      mkdir "$pathcomp" || lasterr=$?
+
+      if test ! -d "$pathcomp"; then
+	errstatus=$lasterr
+      else
+	if test ! -z "$dirmode"; then
+	  echo "chmod $dirmode $pathcomp"
+	  lasterr=
+	  chmod "$dirmode" "$pathcomp" || lasterr=$?
+
+	  if test ! -z "$lasterr"; then
+	    errstatus=$lasterr
+	  fi
+	fi
+      fi
+    fi
+
+    pathcomp=$pathcomp/
+  done
+done
+
+exit $errstatus
+
+# Local Variables:
+# mode: shell-script
+# sh-indentation: 2
+# eval: (add-hook 'write-file-hooks 'time-stamp)
+# time-stamp-start: "scriptversion="
+# time-stamp-format: "%:y-%02m-%02d.%02H"
+# time-stamp-end: "$"
+# End:

png.5

@@ -1,4 +1,4 @@
-.TH PNG 5 "November 1, 2004"
+.TH PNG 5 "May 9, 2008"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION
@@ -18,7 +18,7 @@ gamma and chromaticity data for improved color matching on heterogeneous
 platforms.
 
 .SH "SEE ALSO"
-.IR libpng(3), zlib(3), deflate(5), and zlib(5)
+.IR libpng(3) ", " zlib(3) ", " deflate(5) ", and " zlib(5)
 .LP
 PNG specification (second edition), November 2003:
 .IP
@@ -35,7 +35,7 @@ PNG 1.0 specification, October 1996:
 RFC 2083
 .IP
 .br
-ftp://ds.internic.net/rfc/rfc2083.txt
+ftp://ftp.rfc-editor.org:/in-notes/rfc2083.txt
 .br
 or (as a W3C Recommendation) at
 .br
@@ -58,7 +58,7 @@ Thomas Boutell and others (png-list).
 
 .SH COPYRIGHT NOTICE
 .LP
-This man page is Copyright (c) 1998-2004 Glenn Randers-Pehrson.  See png.h
+This man page is Copyright (c) 1998-2006 Glenn Randers-Pehrson.  See png.h
 for conditions of use and distribution.
 .LP
 The PNG Specification (Second Edition) is

png.c

@@ -1,9 +1,9 @@
 
 /* png.c - location for general purpose libpng functions
  *
- * libpng version 1.2.8beta1 - November 1, 2004
+ * Last changed in libpng 1.2.21 October 4, 2007
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2004 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2007 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  */
@@ -13,18 +13,21 @@
 #include "png.h"
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_2_8beta1 Your_png_h_is_not_version_1_2_8beta1;
+typedef version_1_0_37 Your_png_h_is_not_version_1_0_37;
 
 /* Version information for C files.  This had better match the version
  * string defined in png.h.  */
 
 #ifdef PNG_USE_GLOBAL_ARRAYS
 /* png_libpng_ver was changed to a function in version 1.0.5c */
-const char png_libpng_ver[18] = PNG_LIBPNG_VER_STRING;
+PNG_CONST char png_libpng_ver[18] = PNG_LIBPNG_VER_STRING;
+
+#ifdef PNG_READ_SUPPORTED
 
 /* png_sig was changed to a function in version 1.0.5c */
 /* Place to hold the signature string for a PNG file. */
-const png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
+PNG_CONST png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
+#endif /* PNG_READ_SUPPORTED */
 
 /* Invoke global declarations for constant strings for known chunk types */
 PNG_IHDR;
@@ -49,37 +52,34 @@ PNG_tIME;
 PNG_tRNS;
 PNG_zTXt;
 
+#ifdef PNG_READ_SUPPORTED
 /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
 
 /* start of interlace block */
-const int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
+PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
 
 /* offset to next interlace block */
-const int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
+PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
 
 /* start of interlace block in the y direction */
-const int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
+PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
 
 /* offset to next interlace block in the y direction */
-const int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
-
-/* width of interlace block (used in assembler routines only) */
-#ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
-const int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
-#endif
+PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
 
 /* Height of interlace block.  This is not currently used - if you need
  * it, uncomment it here and in png.h
-const int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
+PNG_CONST int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
 */
 
 /* Mask to determine which pixels are valid in a pass */
-const int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
+PNG_CONST int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
 
 /* Mask to determine which pixels to overwrite while displaying */
-const int FARDATA png_pass_dsp_mask[]
+PNG_CONST int FARDATA png_pass_dsp_mask[]
    = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
 
+#endif /* PNG_READ_SUPPORTED */
 #endif /* PNG_USE_GLOBAL_ARRAYS */
 
 /* Tells libpng that we have already handled the first "num_bytes" bytes
@@ -88,9 +88,11 @@ const int FARDATA png_pass_dsp_mask[]
  * or write any of the magic bytes before it starts on the IHDR.
  */
 
+#ifdef PNG_READ_SUPPORTED
 void PNGAPI
 png_set_sig_bytes(png_structp png_ptr, int num_bytes)
 {
+   if(png_ptr == NULL) return;
    png_debug(1, "in png_set_sig_bytes\n");
    if (num_bytes > 8)
       png_error(png_ptr, "Too many bytes for PNG signature.");
@@ -113,10 +115,10 @@ png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check)
    if (num_to_check > 8)
       num_to_check = 8;
    else if (num_to_check < 1)
-      return (0);
+      return (-1);
 
    if (start > 7)
-      return (0);
+      return (-1);
 
    if (start + num_to_check > 8)
       num_to_check = 8 - start;
@@ -124,16 +126,20 @@ png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check)
    return ((int)(png_memcmp(&sig[start], &png_signature[start], num_to_check)));
 }
 
+#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
 /* (Obsolete) function to check signature bytes.  It does not allow one
  * to check a partial signature.  This function might be removed in the
- * future - use png_sig_cmp().  Returns true (nonzero) if the file is a PNG.
+ * future - use png_sig_cmp().  Returns true (nonzero) if the file is PNG.
  */
 int PNGAPI
 png_check_sig(png_bytep sig, int num)
 {
   return ((int)!png_sig_cmp(sig, (png_size_t)0, (png_size_t)num));
 }
+#endif
+#endif /* PNG_READ_SUPPORTED */
 
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
 /* Function to allocate memory for zlib and clear it to 0. */
 #ifdef PNG_1_0_X
 voidpf PNGAPI
@@ -143,13 +149,14 @@ voidpf /* private */
 png_zalloc(voidpf png_ptr, uInt items, uInt size)
 {
    png_voidp ptr;
-   png_structp p=png_ptr;
+   png_structp p=(png_structp)png_ptr;
    png_uint_32 save_flags=p->flags;
    png_uint_32 num_bytes;
 
+   if(png_ptr == NULL) return (NULL);
    if (items > PNG_UINT_32_MAX/size)
    {
-     png_warning (png_ptr, "Potential overflow in png_zalloc()");
+     png_warning (p, "Potential overflow in png_zalloc()");
      return (NULL);
    }
    num_bytes = (png_uint_32)items * size;
@@ -256,6 +263,7 @@ void PNGAPI
 png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr)
 {
    png_infop info_ptr = NULL;
+   if(png_ptr == NULL) return;
 
    png_debug(1, "in png_destroy_info_struct\n");
    if (info_ptr_ptr != NULL)
@@ -279,7 +287,7 @@ png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr)
  * and applications using it are urged to use png_create_info_struct()
  * instead.
  */
-#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
+#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
 #undef png_info_init
 void PNGAPI
 png_info_init(png_infop info_ptr)
@@ -294,6 +302,8 @@ png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size)
 {
    png_infop info_ptr = *ptr_ptr;
 
+   if(info_ptr == NULL) return;
+
    png_debug(1, "in png_info_init_3\n");
 
    if(png_sizeof(png_info) > png_info_struct_size)
@@ -475,6 +485,11 @@ if (mask & PNG_FREE_SPLT)
 #endif
 
 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+  if(png_ptr->unknown_chunk.data)
+  {
+    png_free(png_ptr, png_ptr->unknown_chunk.data);
+    png_ptr->unknown_chunk.data = NULL;
+  }
 #ifdef PNG_FREE_ME_SUPPORTED
 if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
 #else
@@ -592,6 +607,7 @@ png_info_destroy(png_structp png_ptr, png_infop info_ptr)
 
    png_info_init_3(&info_ptr, png_sizeof(png_info));
 }
+#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
 
 /* This function returns a pointer to the io_ptr associated with the user
  * functions.  The application should free any memory associated with this
@@ -600,9 +616,11 @@ png_info_destroy(png_structp png_ptr, png_infop info_ptr)
 png_voidp PNGAPI
 png_get_io_ptr(png_structp png_ptr)
 {
+   if(png_ptr == NULL) return (NULL);
    return (png_ptr->io_ptr);
 }
 
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
 #if !defined(PNG_NO_STDIO)
 /* Initialize the default input/output functions for the PNG file.  If you
  * use your own read or write routines, you can call either png_set_read_fn()
@@ -614,6 +632,7 @@ void PNGAPI
 png_init_io(png_structp png_ptr, png_FILE_p fp)
 {
    png_debug(1, "in png_init_io\n");
+   if(png_ptr == NULL) return;
    png_ptr->io_ptr = (png_voidp)fp;
 }
 #endif
@@ -629,6 +648,7 @@ png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
         {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
          "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
 
+   if(png_ptr == NULL) return (NULL);
    if (png_ptr->time_buffer == NULL)
    {
       png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29*
@@ -649,7 +669,7 @@ png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
 #ifdef USE_FAR_KEYWORD
    {
       char near_time_buf[29];
-      sprintf(near_time_buf, "%d %s %d %02d:%02d:%02d +0000",
+      png_snprintf6(near_time_buf,29,"%d %s %d %02d:%02d:%02d +0000",
           ptime->day % 32, short_months[(ptime->month - 1) % 12],
           ptime->year, ptime->hour % 24, ptime->minute % 60,
           ptime->second % 61);
@@ -657,7 +677,7 @@ png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
           29*png_sizeof(char));
    }
 #else
-   sprintf(png_ptr->time_buffer, "%d %s %d %02d:%02d:%02d +0000",
+   png_snprintf6(png_ptr->time_buffer,29,"%d %s %d %02d:%02d:%02d +0000",
        ptime->day % 32, short_months[(ptime->month - 1) % 12],
        ptime->year, ptime->hour % 24, ptime->minute % 60,
        ptime->second % 61);
@@ -667,24 +687,16 @@ png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
 }
 #endif /* PNG_TIME_RFC1123_SUPPORTED */
 
-#if 0
-/* Signature string for a PNG file. */
-png_bytep PNGAPI
-png_sig_bytes(void)
-{
-   return ((png_bytep)"\211\120\116\107\015\012\032\012");
-}
-#endif
+#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
 
 png_charp PNGAPI
 png_get_copyright(png_structp png_ptr)
 {
-   if (&png_ptr != NULL)  /* silence compiler warning about unused png_ptr */
-   return ((png_charp) "\n libpng version 1.2.8beta1 - November 1, 2004\n\
-   Copyright (c) 1998-2004 Glenn Randers-Pehrson\n\
+   png_ptr = png_ptr;  /* silence compiler warning about unused png_ptr */
+   return ((png_charp) "\n libpng version 1.0.37 - May 9, 2008\n\
+   Copyright (c) 1998-2008 Glenn Randers-Pehrson\n\
    Copyright (c) 1996-1997 Andreas Dilger\n\
    Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.\n");
-   return ((png_charp) "");
 }
 
 /* The following return the library version as a short string in the
@@ -699,29 +711,31 @@ png_charp PNGAPI
 png_get_libpng_ver(png_structp png_ptr)
 {
    /* Version of *.c files used when building libpng */
-   if (&png_ptr != NULL)  /* silence compiler warning about unused png_ptr */
-      return ((png_charp) PNG_LIBPNG_VER_STRING);
-   return ((png_charp) "");
+   png_ptr = png_ptr;  /* silence compiler warning about unused png_ptr */
+   return ((png_charp) PNG_LIBPNG_VER_STRING);
 }
 
 png_charp PNGAPI
 png_get_header_ver(png_structp png_ptr)
 {
    /* Version of *.h files used when building libpng */
-   if (&png_ptr != NULL)  /* silence compiler warning about unused png_ptr */
-      return ((png_charp) PNG_LIBPNG_VER_STRING);
-   return ((png_charp) "");
+   png_ptr = png_ptr;  /* silence compiler warning about unused png_ptr */
+   return ((png_charp) PNG_LIBPNG_VER_STRING);
 }
 
 png_charp PNGAPI
 png_get_header_version(png_structp png_ptr)
 {
    /* Returns longer string containing both version and date */
-   if (&png_ptr != NULL)  /* silence compiler warning about unused png_ptr */
-      return ((png_charp) PNG_HEADER_VERSION_STRING);
-   return ((png_charp) "");
+   png_ptr = png_ptr;  /* silence compiler warning about unused png_ptr */
+   return ((png_charp) PNG_HEADER_VERSION_STRING
+#ifndef PNG_READ_SUPPORTED
+   "     (NO READ SUPPORT)"
+#endif
+   "\n");
 }
 
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
 int PNGAPI
 png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name)
@@ -729,7 +743,7 @@ png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name)
    /* check chunk_name and return "keep" value if it's on the list, else 0 */
    int i;
    png_bytep p;
-   if((png_ptr == NULL && chunk_name == NULL) || png_ptr->num_chunk_list<=0)
+   if(png_ptr == NULL || chunk_name == NULL || png_ptr->num_chunk_list<=0)
       return 0;
    p=png_ptr->chunk_list+png_ptr->num_chunk_list*5-5;
    for (i = png_ptr->num_chunk_list; i; i--, p-=5)
@@ -743,8 +757,10 @@ png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name)
 int PNGAPI
 png_reset_zstream(png_structp png_ptr)
 {
+   if (png_ptr == NULL) return Z_STREAM_ERROR;
    return (inflateReset(&png_ptr->zstream));
 }
+#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
 
 /* This function was added to libpng-1.0.7 */
 png_uint_32 PNGAPI
@@ -755,66 +771,19 @@ png_access_version_number(void)
 }
 
 
+#if defined(PNG_READ_SUPPORTED) && defined(PNG_ASSEMBLER_CODE_SUPPORTED)
 #if !defined(PNG_1_0_X)
-#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
-    /* GRR:  could add this:   && defined(PNG_MMX_CODE_SUPPORTED) */
-/* this INTERNAL function was added to libpng 1.2.0 */
-void /* PRIVATE */
-png_init_mmx_flags (png_structp png_ptr)
-{
-    png_ptr->mmx_rowbytes_threshold = 0;
-    png_ptr->mmx_bitdepth_threshold = 0;
-
-#  if (defined(PNG_USE_PNGVCRD) || defined(PNG_USE_PNGGCCRD))
-
-    png_ptr->asm_flags |= PNG_ASM_FLAG_MMX_SUPPORT_COMPILED;
-
-    if (png_mmx_support() > 0) {
-        png_ptr->asm_flags |= PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU
-#    ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
-                              | PNG_ASM_FLAG_MMX_READ_COMBINE_ROW
-#    endif
-#    ifdef PNG_HAVE_ASSEMBLER_READ_INTERLACE
-                              | PNG_ASM_FLAG_MMX_READ_INTERLACE
-#    endif
-#    ifndef PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
-                              ;
-#    else
-                              | PNG_ASM_FLAG_MMX_READ_FILTER_SUB
-                              | PNG_ASM_FLAG_MMX_READ_FILTER_UP
-                              | PNG_ASM_FLAG_MMX_READ_FILTER_AVG
-                              | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ;
-
-        png_ptr->mmx_rowbytes_threshold = PNG_MMX_ROWBYTES_THRESHOLD_DEFAULT;
-        png_ptr->mmx_bitdepth_threshold = PNG_MMX_BITDEPTH_THRESHOLD_DEFAULT;
-#    endif
-    } else {
-        png_ptr->asm_flags &= ~( PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU
-                               | PNG_MMX_READ_FLAGS
-                               | PNG_MMX_WRITE_FLAGS );
-    }
-
-#  else /* !((PNGVCRD || PNGGCCRD) && PNG_ASSEMBLER_CODE_SUPPORTED)) */
-
-    /* clear all MMX flags; no support is compiled in */
-    png_ptr->asm_flags &= ~( PNG_MMX_FLAGS );
-
-#  endif /* ?(PNGVCRD || PNGGCCRD) */
-}
-
-#endif /* !(PNG_ASSEMBLER_CODE_SUPPORTED) */
-
 /* this function was added to libpng 1.2.0 */
-#if !defined(PNG_USE_PNGGCCRD) && \
-    !(defined(PNG_ASSEMBLER_CODE_SUPPORTED) && defined(PNG_USE_PNGVCRD))
 int PNGAPI
 png_mmx_support(void)
 {
+   /* obsolete, to be removed from libpng-1.4.0 */
     return -1;
 }
-#endif
 #endif /* PNG_1_0_X */
+#endif /* PNG_READ_SUPPORTED && PNG_ASSEMBLER_CODE_SUPPORTED */
 
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
 #ifdef PNG_SIZE_T
 /* Added at libpng version 1.2.6 */
    PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size));
@@ -826,3 +795,4 @@ png_convert_size(size_t size)
   return ((png_size_t)size);
 }
 #endif /* PNG_SIZE_T */
+#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */

png.h

@@ -1,14 +1,14 @@
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.2.8beta1 - November 1, 2004
- * Copyright (c) 1998-2004 Glenn Randers-Pehrson
+ * libpng version 1.0.37 - May 9, 2008
+ * Copyright (c) 1998-2008 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
  * Authors and maintainers:
  *  libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
  *  libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
- *  libpng versions 0.97, January 1998, through 1.2.8beta1 - November 1, 2004: Glenn
+ *  libpng versions 0.97, January 1998, through 1.0.37 - May 9, 2008: Glenn
  *  See also "Contributing Authors", below.
  *
  * Note about libpng version numbers:
@@ -102,10 +102,97 @@
  *    1.0.16                  10    10016  10.so.0.1.0.16
  *    1.2.6                   13    10206  12.so.0.1.2.6
  *    1.2.7beta1-2            13    10207  12.so.0.1.2.7beta1-2
- *    1.0.17rc1               10    10017  12.so.0.1.0.17rc1
+ *    1.0.17rc1               10    10017  10.so.0.1.0.17rc1
  *    1.2.7rc1                13    10207  12.so.0.1.2.7rc1
- *    1.0.17                  10    10017  12.so.0.1.0.17
+ *    1.0.17                  10    10017  10.so.0.1.0.17
  *    1.2.7                   13    10207  12.so.0.1.2.7
+ *    1.2.8beta1-5            13    10208  12.so.0.1.2.8beta1-5
+ *    1.0.18rc1-5             10    10018  10.so.0.1.0.18rc1-5
+ *    1.2.8rc1-5              13    10208  12.so.0.1.2.8rc1-5
+ *    1.0.18                  10    10018  10.so.0.1.0.18
+ *    1.2.8                   13    10208  12.so.0.1.2.8
+ *    1.2.9beta1-3            13    10209  12.so.0.1.2.9beta1-3
+ *    1.2.9beta4-11           13    10209  12.so.0.9[.0]
+ *    1.2.9rc1                13    10209  12.so.0.9[.0]
+ *    1.2.9                   13    10209  12.so.0.9[.0]
+ *    1.2.10beta1-8           13    10210  12.so.0.10[.0]
+ *    1.2.10rc1-3             13    10210  12.so.0.10[.0]
+ *    1.2.10                  13    10210  12.so.0.10[.0]
+ *    1.2.11beta1-4           13    10211  12.so.0.11[.0]
+ *    1.0.19rc1-5             10    10019  10.so.0.19[.0]
+ *    1.2.11rc1-5             13    10211  12.so.0.11[.0]
+ *    1.0.19                  10    10019  10.so.0.19[.0]
+ *    1.2.11                  13    10211  12.so.0.11[.0]
+ *    1.0.20                  10    10020  10.so.0.20[.0]
+ *    1.2.12                  13    10212  12.so.0.12[.0]
+ *    1.2.13beta1             13    10213  12.so.0.13[.0]
+ *    1.0.21                  10    10021  10.so.0.21[.0]
+ *    1.2.13                  13    10213  12.so.0.13[.0]
+ *    1.2.14beta1-2           13    10214  12.so.0.14[.0]
+ *    1.0.22rc1               10    10022  10.so.0.22[.0]
+ *    1.2.14rc1               13    10214  12.so.0.14[.0]
+ *    1.0.22                  10    10022  10.so.0.22[.0]
+ *    1.2.14                  13    10214  12.so.0.14[.0]
+ *    1.2.15beta1-6           13    10215  12.so.0.15[.0]
+ *    1.0.23rc1-5             10    10023  10.so.0.23[.0]
+ *    1.2.15rc1-5             13    10215  12.so.0.15[.0]
+ *    1.0.23                  10    10023  10.so.0.23[.0]
+ *    1.2.15                  13    10215  12.so.0.15[.0]
+ *    1.2.16beta1-2           13    10216  12.so.0.16[.0]
+ *    1.2.16rc1               13    10216  12.so.0.16[.0]
+ *    1.0.24                  10    10024  10.so.0.24[.0]
+ *    1.2.16                  13    10216  12.so.0.16[.0]
+ *    1.2.17beta1-2           13    10217  12.so.0.17[.0]
+ *    1.0.25rc1               10    10025  10.so.0.25[.0]
+ *    1.2.17rc1-3             13    10217  12.so.0.17[.0]
+ *    1.0.25                  10    10025  10.so.0.25[.0]
+ *    1.2.17                  13    10217  12.so.0.17[.0]
+ *    1.0.26                  10    10026  10.so.0.26[.0]
+ *    1.2.18                  13    10218  12.so.0.18[.0]
+ *    1.2.19beta1-31          13    10219  12.so.0.19[.0]
+ *    1.0.27rc1-6             10    10027  10.so.0.27[.0]
+ *    1.2.19rc1-6             13    10219  12.so.0.19[.0]
+ *    1.0.27                  10    10027  10.so.0.27[.0]
+ *    1.2.19                  13    10219  12.so.0.19[.0]
+ *    1.2.20beta01-04         13    10220  12.so.0.20[.0]
+ *    1.0.28rc1-6             10    10028  10.so.0.28[.0]
+ *    1.2.20rc1-6             13    10220  12.so.0.20[.0]
+ *    1.0.28                  10    10028  10.so.0.28[.0]
+ *    1.2.20                  13    10220  12.so.0.20[.0]
+ *    1.2.21beta1-2           13    10221  12.so.0.21[.0]
+ *    1.2.21rc1-3             13    10221  12.so.0.21[.0]
+ *    1.0.29                  10    10029  10.so.0.29[.0]
+ *    1.2.21                  13    10221  12.so.0.21[.0]
+ *    1.2.22beta1-4           13    10222  12.so.0.22[.0]
+ *    1.0.30rc1               10    10030  10.so.0.30[.0]
+ *    1.2.22rc1               13    10222  12.so.0.22[.0]
+ *    1.0.30                  10    10030  10.so.0.30[.0]
+ *    1.2.22                  13    10222  12.so.0.22[.0]
+ *    1.2.23beta01-05         13    10223  12.so.0.23[.0]
+ *    1.2.23rc01              13    10223  12.so.0.23[.0]
+ *    1.2.23                  13    10223  12.so.0.23[.0]
+ *    1.2.24beta01-02         13    10224  12.so.0.24[.0]
+ *    1.2.24rc01              13    10224  12.so.0.24[.0]
+ *    1.2.24                  13    10224  12.so.0.24[.0]
+ *    1.2.25beta01-06         13    10225  12.so.0.25[.0]
+ *    1.2.25rc01-02           13    10225  12.so.0.25[.0]
+ *    1.0.31                  10    10031  10.so.0.31[.0]
+ *    1.2.25                  13    10225  12.so.0.25[.0]
+ *    1.2.26beta01-06         13    10226  12.so.0.26[.0]
+ *    1.2.26rc01              13    10226  12.so.0.26[.0]
+ *    1.2.26                  13    10226  12.so.0.26[.0]
+ *    1.0.32                  10    10032  10.so.0.32[.0]
+ *    1.2.27beta01-06         13    10227  12.so.0.27[.0]
+ *    1.2.27rc01              13    10227  12.so.0.27[.0]
+ *    1.0.33                  10    10033  10.so.0.33[.0]
+ *    1.2.27                  13    10227  12.so.0.27[.0]
+ *    1.0.34                  10    10034  10.so.0.34[.0]
+ *    1.2.28                  13    10228  12.so.0.28[.0]
+ *    1.2.29beta01-03         13    10229  12.so.0.29[.0]
+ *    1.2.29rc01              13    10229  12.so.0.29[.0]
+ *    1.0.35                  10    10035  10.so.0.35[.0]
+ *    1.2.29                  13    10229  12.so.0.29[.0]
+ *    1.0.37                  10    10037  10.so.0.37[.0]
  *
  *    Henceforth the source version will match the shared-library major
  *    and minor numbers; the shared-library major version number will be
@@ -115,7 +202,7 @@
  *    to the source version x.y.z (leading zeros in y and z).  Beta versions
  *    were given the previous public release number plus a letter, until
  *    version 1.0.6j; from then on they were given the upcoming public
- *    release number plus "betaNN" or "rcN".
+ *    release number plus "betaNN" or "rcNN".
  *
  *    Binary incompatibility exists only when applications make direct access
  *    to the info_ptr or png_ptr members through png.h, and the compiled
@@ -135,8 +222,8 @@
  * If you modify libpng you may insert additional notices immediately following
  * this sentence.
  *
- * libpng versions 1.2.6, August 15, 2004, through 1.2.8beta1, November 1, 2004, are
- * Copyright (c) 2004 Glenn Randers-Pehrson, and are
+ * libpng versions 1.2.6, August 15, 2004, through 1.0.37, May 9, 2008, are
+ * Copyright (c) 2004, 2006-2008 Glenn Randers-Pehrson, and are
  * distributed according to the same disclaimer and license as libpng-1.2.5
  * with the following individual added to the list of Contributing Authors:
  *
@@ -247,13 +334,13 @@
  * Y2K compliance in libpng:
  * =========================
  *
- *    November 1, 2004
+ *    May 9, 2008
  *
  *    Since the PNG Development group is an ad-hoc body, we can't make
  *    an official declaration.
  *
  *    This is your unofficial assurance that libpng from version 0.71 and
- *    upward through 1.2.8beta1 are Y2K compliant.  It is my belief that earlier
+ *    upward through 1.0.37 are Y2K compliant.  It is my belief that earlier
  *    versions were also Y2K compliant.
  *
  *    Libpng only has three year fields.  One is a 2-byte unsigned integer
@@ -309,45 +396,81 @@
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.2.8beta1"
+#define PNG_LIBPNG_VER_STRING "1.0.37"
 #define PNG_HEADER_VERSION_STRING \
-   " libpng version 1.2.8beta1 - November 1, 2004 (header)\n"
+   " libpng version 1.0.37 - May 9, 2008\n"
 
 #define PNG_LIBPNG_VER_SONUM   0
-#define PNG_LIBPNG_VER_DLLNUM  %DLLNUM%
+#define PNG_LIBPNG_VER_DLLNUM  10
 
 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
 #define PNG_LIBPNG_VER_MAJOR   1
-#define PNG_LIBPNG_VER_MINOR   2
-#define PNG_LIBPNG_VER_RELEASE 8
+#define PNG_LIBPNG_VER_MINOR   0
+#define PNG_LIBPNG_VER_RELEASE 37
 /* This should match the numeric part of the final component of
  * PNG_LIBPNG_VER_STRING, omitting any leading zero: */
 
-#define PNG_LIBPNG_VER_BUILD  1
+#define PNG_LIBPNG_VER_BUILD  0
 
+/* Release Status */
 #define PNG_LIBPNG_BUILD_ALPHA    1
 #define PNG_LIBPNG_BUILD_BETA     2
 #define PNG_LIBPNG_BUILD_RC       3
 #define PNG_LIBPNG_BUILD_STABLE   4
-#define PNG_LIBPNG_BUILD_TYPEMASK 7
-#define PNG_LIBPNG_BUILD_PATCH    8 /* Can be OR'ed with STABLE only */
-#define PNG_LIBPNG_BUILD_TYPE 2
+#define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
+  
+/* Release-Specific Flags */
+#define PNG_LIBPNG_BUILD_PATCH    8 /* Can be OR'ed with
+                                       PNG_LIBPNG_BUILD_STABLE only */
+#define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with
+                                       PNG_LIBPNG_BUILD_SPECIAL */
+#define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
+                                       PNG_LIBPNG_BUILD_PRIVATE */
+
+#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
 
 /* Careful here.  At one time, Guy wanted to use 082, but that would be octal.
  * We must not include leading zeros.
  * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
  * version 1.0.0 was mis-numbered 100 instead of 10000).  From
  * version 1.0.1 it's    xxyyzz, where x=major, y=minor, z=release */
-#define PNG_LIBPNG_VER 10208 /* 1.2.8 */
+#define PNG_LIBPNG_VER 10037 /* 1.0.37 */
 
 #ifndef PNG_VERSION_INFO_ONLY
-
 /* include the compression library's header */
 #include "zlib.h"
+#endif
 
 /* include all user configurable info, including optional assembler routines */
 #include "pngconf.h"
 
+/*
+ * Added at libpng-1.2.8 */
+/* Ref MSDN: Private as priority over Special
+ * VS_FF_PRIVATEBUILD File *was not* built using standard release
+ * procedures. If this value is given, the StringFileInfo block must
+ * contain a PrivateBuild string. 
+ *
+ * VS_FF_SPECIALBUILD File *was* built by the original company using
+ * standard release procedures but is a variation of the standard
+ * file of the same version number. If this value is given, the
+ * StringFileInfo block must contain a SpecialBuild string. 
+ */
+
+#if defined(PNG_USER_PRIVATEBUILD)
+#  define PNG_LIBPNG_BUILD_TYPE \
+          (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
+#else
+#  if defined(PNG_LIBPNG_SPECIALBUILD)
+#    define PNG_LIBPNG_BUILD_TYPE \
+            (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
+#  else
+#    define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
+#  endif
+#endif
+
+#ifndef PNG_VERSION_INFO_ONLY
+
 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */
 #ifdef __cplusplus
 extern "C" {
@@ -399,7 +522,7 @@ extern "C" {
  * the version above.
  */
 #ifdef PNG_USE_GLOBAL_ARRAYS
-PNG_EXPORT_VAR (const char) png_libpng_ver[18];
+PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18];
   /* need room for 99.99.99beta99z */
 #else
 #define png_libpng_ver png_get_header_ver(NULL)
@@ -408,17 +531,14 @@ PNG_EXPORT_VAR (const char) png_libpng_ver[18];
 #ifdef PNG_USE_GLOBAL_ARRAYS
 /* This was removed in version 1.0.5c */
 /* Structures to facilitate easy interlacing.  See png.c for more details */
-PNG_EXPORT_VAR (const int FARDATA) png_pass_start[7];
-PNG_EXPORT_VAR (const int FARDATA) png_pass_inc[7];
-PNG_EXPORT_VAR (const int FARDATA) png_pass_ystart[7];
-PNG_EXPORT_VAR (const int FARDATA) png_pass_yinc[7];
-PNG_EXPORT_VAR (const int FARDATA) png_pass_mask[7];
-PNG_EXPORT_VAR (const int FARDATA) png_pass_dsp_mask[7];
-#ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
-PNG_EXPORT_VAR (const int FARDATA) png_pass_width[7];
-#endif
+PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7];
+PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7];
+PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7];
+PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7];
+PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7];
+PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7];
 /* This isn't currently used.  If you need it, see png.c for more details.
-PNG_EXPORT_VAR (const int FARDATA) png_pass_height[7];
+PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7];
 */
 #endif
 
@@ -555,9 +675,10 @@ typedef png_time FAR * FAR * png_timepp;
  * up private chunks for output even though the library doesn't actually
  * know about their semantics.
  */
+#define PNG_CHUNK_NAME_LENGTH 5
 typedef struct png_unknown_chunk_t
 {
-    png_byte name[5];
+    png_byte name[PNG_CHUNK_NAME_LENGTH];
     png_byte *data;
     png_size_t size;
 
@@ -851,10 +972,12 @@ typedef png_info FAR * FAR * png_infopp;
 
 /* Maximum positive integer used in PNG is (2^31)-1 */
 #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
-#define PNG_UINT_32_MAX (~((png_uint_32)0))
-#define PNG_SIZE_MAX (~((png_size_t)0))
+#define PNG_UINT_32_MAX ((png_uint_32)(-1))
+#define PNG_SIZE_MAX ((png_size_t)(-1))
+#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
 /* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */
 #define PNG_MAX_UINT PNG_UINT_31_MAX
+#endif
 
 /* These describe the color_type field in png_info. */
 /* color type masks */
@@ -1082,10 +1205,12 @@ struct png_struct_def
    png_uint_32 row_number;    /* current row in interlace pass */
    png_bytep prev_row;        /* buffer to save previous (unfiltered) row */
    png_bytep row_buf;         /* buffer to save current (unfiltered) row */
+#ifndef PNG_NO_WRITE_FILTERING
    png_bytep sub_row;         /* buffer to save "sub" row when filtering */
    png_bytep up_row;          /* buffer to save "up" row when filtering */
    png_bytep avg_row;         /* buffer to save "avg" row when filtering */
    png_bytep paeth_row;       /* buffer to save "Paeth" row when filtering */
+#endif
    png_row_info row_info;     /* used for transformation routines */
 
    png_uint_32 idat_size;     /* current IDAT size for read */
@@ -1187,8 +1312,7 @@ struct png_struct_def
      png_size_t current_text_left;   /* how much text left to read in input */
      png_charp current_text;         /* current text chunk buffer */
      png_charp current_text_ptr;     /* current location in current_text */
-#  endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_TEXT_SUPPORTED */
-
+#  endif /* PNG_TEXT_SUPPORTED */
 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
 
 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
@@ -1270,16 +1394,20 @@ struct png_struct_def
    png_byte filter_type;
 #endif
 
-#if defined(PNG_1_0_X) || (defined(PNG_DEBUG) && defined(PNG_USE_PNGGCCRD))
+#if defined(PNG_1_0_X)
 /* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */
    png_uint_32 row_buf_size;
 #endif
 
 /* New members added in libpng-1.2.0 */
-#if !defined(PNG_1_0_X) && defined(PNG_ASSEMBLER_CODE_SUPPORTED)
+#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
+#  if !defined(PNG_1_0_X)
+#    if defined(PNG_MMX_CODE_SUPPORTED)
    png_byte     mmx_bitdepth_threshold;
    png_uint_32  mmx_rowbytes_threshold;
+#    endif
    png_uint_32  asm_flags;
+#  endif
 #endif
 
 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
@@ -1309,13 +1437,21 @@ struct png_struct_def
    png_uint_32 user_height_max;
 #endif
 
+/* New member added in libpng-1.0.25 and 1.2.17 */
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+   /* storage for unknown chunk that the library doesn't recognize. */
+   png_unknown_chunk unknown_chunk;
+#endif
+
+/* New members added in libpng-1.2.26 */
+  png_uint_32 old_big_row_buf_size, old_prev_row_size;
 };
 
 
 /* This triggers a compiler error in png.c, if png.c and png.h
  * do not agree upon the version number.
  */
-typedef png_structp version_1_2_8beta1;
+typedef png_structp version_1_0_37;
 
 typedef png_struct FAR * FAR * png_structpp;
 
@@ -1401,11 +1537,14 @@ extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr));
 extern PNG_EXPORT(png_infop,png_create_info_struct)
    PNGARG((png_structp png_ptr));
 
+#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
 /* Initialize the info structure (old interface - DEPRECATED) */
 extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr));
 #undef png_info_init
 #define png_info_init(info_ptr) png_info_init_3(&info_ptr,\
     png_sizeof(png_info));
+#endif
+
 extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr,
     png_size_t png_info_struct_size));
 
@@ -1442,9 +1581,16 @@ extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,
 #if defined(PNG_READ_EXPAND_SUPPORTED)
 /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
 extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr));
-extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr));
+#if !defined(PNG_1_0_X)
+extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp
+  png_ptr));
+#endif
 extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr));
 extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr));
+#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
+/* Deprecated */
+extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr));
+#endif
 #endif
 
 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
@@ -1565,6 +1711,7 @@ extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,
 #endif
 #endif
 
+#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
     defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
 /* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */
@@ -1572,6 +1719,7 @@ extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,
 extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr,
    int empty_plte_permitted));
 #endif
+#endif
 
 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
 /* Set how many lines between output flushes - 0 for no flushing */
@@ -1951,6 +2099,7 @@ extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
    int check));
 #endif /* USE_FAR_KEYWORD */
 
+#ifndef PNG_NO_ERROR_TEXT
 /* Fatal error in PNG image of libpng - can't continue */
 extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,
    png_const_charp error_message));
@@ -1958,14 +2107,22 @@ extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,
 /* The same, but the chunk name is prepended to the error string. */
 extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr,
    png_const_charp error_message));
+#else
+/* Fatal error in PNG image of libpng - can't continue */
+extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr));
+#endif
 
+#ifndef PNG_NO_WARNINGS
 /* Non-fatal error in libpng.  Can continue, but may have a problem. */
 extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr,
    png_const_charp warning_message));
 
+#ifdef PNG_READ_SUPPORTED
 /* Non-fatal error in libpng, chunk name is prepended to message. */
 extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
    png_const_charp warning_message));
+#endif /* PNG_READ_SUPPORTED */
+#endif /* PNG_NO_WARNINGS */
 
 /* The png_set_<chunk> functions are for storing values in the png_info_struct.
  * Similarly, the png_get_<chunk> calls are used to read values from the
@@ -2286,11 +2443,12 @@ extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr,
 #ifdef PNG_FLOATING_POINT_SUPPORTED
 extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr,
    png_infop info_ptr, int unit, double width, double height));
-#endif
+#else
 #ifdef PNG_FIXED_POINT_SUPPORTED
 extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
    png_infop info_ptr, int unit, png_charp swidth, png_charp sheight));
 #endif
+#endif
 #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
 
 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
@@ -2298,7 +2456,7 @@ extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
    handling or default unknown chunk handling is not desired.  Any chunks not
    listed will be handled in the default manner.  The IHDR and IEND chunks
    must not be listed.
-      keep = 0: follow default behavour
+      keep = 0: follow default behaviour
            = 1: do not keep
            = 2: keep only if safe-to-copy
            = 3: keep even if unsafe-to-copy
@@ -2386,8 +2544,6 @@ extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
 #define png_debug2(l, m, p1, p2)
 #endif
 
-extern PNG_EXPORT(png_bytep,png_sig_bytes) PNGARG((void));
-
 extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));
 extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr));
 extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));
@@ -2406,6 +2562,7 @@ extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
 
 /* Added to version 1.2.0 */
 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
+#if defined(PNG_MMX_CODE_SUPPORTED)
 #define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED  0x01  /* not user-settable */
 #define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU    0x02  /* not user-settable */
 #define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  0x04
@@ -2431,6 +2588,7 @@ extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
 
 #define PNG_SELECT_READ   1
 #define PNG_SELECT_WRITE  2
+#endif /* PNG_MMX_CODE_SUPPORTED */
 
 #if !defined(PNG_1_0_X)
 /* pngget.c */
@@ -2463,11 +2621,11 @@ extern PNG_EXPORT(void,png_set_mmx_thresholds)
    png_uint_32 mmx_rowbytes_threshold));
 
 #endif /* PNG_1_0_X */
-#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
 
 #if !defined(PNG_1_0_X)
 /* png.c, pnggccrd.c, or pngvcrd.c */
 extern PNG_EXPORT(int,png_mmx_support) PNGARG((void));
+#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
 
 /* Strip the prepended error numbers ("#nnn ") from error and warning
  * messages before passing them to the error or warning handler. */
@@ -2531,22 +2689,65 @@ extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
 
 #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
 
+/* Inline macros to do direct reads of bytes from the input buffer.  These
+ * require that you are using an architecture that uses PNG byte ordering
+ * (MSB first) and supports unaligned data storage.  I think that PowerPC
+ * in big-endian mode and 680x0 are the only ones that will support this.
+ * The x86 line of processors definitely do not.  The png_get_int_32()
+ * routine also assumes we are using two's complement format for negative
+ * values, which is almost certainly true.
+ */
+#if defined(PNG_READ_BIG_ENDIAN_SUPPORTED)
+#  define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
+#  define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
+#  define png_get_int_32(buf)  ( *((png_int_32p)  (buf)))
+#else
+extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf));
+extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf));
+extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf));
+#endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */
+extern PNG_EXPORT(png_uint_32,png_get_uint_31)
+  PNGARG((png_structp png_ptr, png_bytep buf));
+/* No png_get_int_16 -- may be added if there's a real need for it. */
+
+/* Place a 32-bit number into a buffer in PNG byte order (big-endian).
+ */
+extern PNG_EXPORT(void,png_save_uint_32)
+   PNGARG((png_bytep buf, png_uint_32 i));
+extern PNG_EXPORT(void,png_save_int_32)
+   PNGARG((png_bytep buf, png_int_32 i));
+
+/* Place a 16-bit number into a buffer in PNG byte order.
+ * The parameter is declared unsigned int, not png_uint_16,
+ * just to avoid potential problems on pre-ANSI C compilers.
+ */
+extern PNG_EXPORT(void,png_save_uint_16)
+   PNGARG((png_bytep buf, unsigned int i));
+/* No png_save_int_16 -- may be added if there's a real need for it. */
+
+/* ************************************************************************* */
+
 /* These next functions are used internally in the code.  They generally
  * shouldn't be used unless you are writing code to add or replace some
  * functionality in libpng.  More information about most functions can
  * be found in the files where the functions are located.
  */
 
-#if defined(PNG_INTERNAL)
 
-/* Various modes of operation.  Note that after an init, mode is set to
- * zero automatically when the structure is created.
+/* Various modes of operation, that are visible to applications because
+ * they are used for unknown chunk location.
  */
 #define PNG_HAVE_IHDR               0x01
 #define PNG_HAVE_PLTE               0x02
 #define PNG_HAVE_IDAT               0x04
-#define PNG_AFTER_IDAT              0x08
+#define PNG_AFTER_IDAT              0x08 /* Have complete zlib datastream */
 #define PNG_HAVE_IEND               0x10
+
+#if defined(PNG_INTERNAL)
+
+/* More modes of operation.  Note that after an init, mode is set to
+ * zero automatically when the structure is created.
+ */
 #define PNG_HAVE_gAMA               0x20
 #define PNG_HAVE_cHRM               0x40
 #define PNG_HAVE_sRGB               0x80
@@ -2555,6 +2756,7 @@ extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400
 #define PNG_BACKGROUND_IS_GRAY     0x800
 #define PNG_HAVE_PNG_SIGNATURE    0x1000
+#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
 
 /* flags for the transformations the PNG library does on the image data */
 #define PNG_BGR                0x0001
@@ -2581,7 +2783,14 @@ extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
 #define PNG_RGB_TO_GRAY_ERR  0x200000L
 #define PNG_RGB_TO_GRAY_WARN 0x400000L
 #define PNG_RGB_TO_GRAY      0x600000L  /* two bits, RGB_TO_GRAY_ERR|WARN */
+                       /*    0x800000L     Unused */
 #define PNG_ADD_ALPHA       0x1000000L  /* Added to libpng-1.2.7 */
+#define PNG_EXPAND_tRNS     0x2000000L  /* Added to libpng-1.2.9 */
+                       /*   0x4000000L  unused */
+                       /*   0x8000000L  unused */
+                       /*  0x10000000L  unused */
+                       /*  0x20000000L  unused */
+                       /*  0x40000000L  unused */
 
 /* flags for png_create_struct */
 #define PNG_STRUCT_PNG   0x0001
@@ -2615,6 +2824,16 @@ extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
 #define PNG_FLAG_STRIP_ERROR_NUMBERS      0x40000L
 #define PNG_FLAG_STRIP_ERROR_TEXT         0x80000L
 #define PNG_FLAG_MALLOC_NULL_MEM_OK       0x100000L
+#define PNG_FLAG_ADD_ALPHA                0x200000L  /* Added to libpng-1.2.8 */
+#define PNG_FLAG_STRIP_ALPHA              0x400000L  /* Added to libpng-1.2.8 */
+                                  /*      0x800000L  unused */
+                                  /*     0x1000000L  unused */
+                                  /*     0x2000000L  unused */
+                                  /*     0x4000000L  unused */
+                                  /*     0x8000000L  unused */
+                                  /*    0x10000000L  unused */
+                                  /*    0x20000000L  unused */
+                                  /*    0x40000000L  unused */
 
 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
                                      PNG_FLAG_CRC_ANCILLARY_NOWARN)
@@ -2648,9 +2867,8 @@ extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
 /* place to hold the signature string for a PNG file. */
 #ifdef PNG_USE_GLOBAL_ARRAYS
-   PNG_EXPORT_VAR (const png_byte FARDATA) png_sig[8];
+   PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8];
 #else
-#define png_sig png_sig_bytes(NULL)
 #endif
 #endif /* PNG_NO_EXTERN */
 
@@ -2658,77 +2876,53 @@ extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
  * define the name here, and add an invocation of the macro in png.c and
  * wherever it's needed.
  */
-#define PNG_IHDR const png_byte png_IHDR[5] = { 73,  72,  68,  82, '\0'}
-#define PNG_IDAT const png_byte png_IDAT[5] = { 73,  68,  65,  84, '\0'}
-#define PNG_IEND const png_byte png_IEND[5] = { 73,  69,  78,  68, '\0'}
-#define PNG_PLTE const png_byte png_PLTE[5] = { 80,  76,  84,  69, '\0'}
-#define PNG_bKGD const png_byte png_bKGD[5] = { 98,  75,  71,  68, '\0'}
-#define PNG_cHRM const png_byte png_cHRM[5] = { 99,  72,  82,  77, '\0'}
-#define PNG_gAMA const png_byte png_gAMA[5] = {103,  65,  77,  65, '\0'}
-#define PNG_hIST const png_byte png_hIST[5] = {104,  73,  83,  84, '\0'}
-#define PNG_iCCP const png_byte png_iCCP[5] = {105,  67,  67,  80, '\0'}
-#define PNG_iTXt const png_byte png_iTXt[5] = {105,  84,  88, 116, '\0'}
-#define PNG_oFFs const png_byte png_oFFs[5] = {111,  70,  70, 115, '\0'}
-#define PNG_pCAL const png_byte png_pCAL[5] = {112,  67,  65,  76, '\0'}
-#define PNG_sCAL const png_byte png_sCAL[5] = {115,  67,  65,  76, '\0'}
-#define PNG_pHYs const png_byte png_pHYs[5] = {112,  72,  89, 115, '\0'}
-#define PNG_sBIT const png_byte png_sBIT[5] = {115,  66,  73,  84, '\0'}
-#define PNG_sPLT const png_byte png_sPLT[5] = {115,  80,  76,  84, '\0'}
-#define PNG_sRGB const png_byte png_sRGB[5] = {115,  82,  71,  66, '\0'}
-#define PNG_tEXt const png_byte png_tEXt[5] = {116,  69,  88, 116, '\0'}
-#define PNG_tIME const png_byte png_tIME[5] = {116,  73,  77,  69, '\0'}
-#define PNG_tRNS const png_byte png_tRNS[5] = {116,  82,  78,  83, '\0'}
-#define PNG_zTXt const png_byte png_zTXt[5] = {122,  84,  88, 116, '\0'}
+#define PNG_IHDR png_byte png_IHDR[5] = { 73,  72,  68,  82, '\0'}
+#define PNG_IDAT png_byte png_IDAT[5] = { 73,  68,  65,  84, '\0'}
+#define PNG_IEND png_byte png_IEND[5] = { 73,  69,  78,  68, '\0'}
+#define PNG_PLTE png_byte png_PLTE[5] = { 80,  76,  84,  69, '\0'}
+#define PNG_bKGD png_byte png_bKGD[5] = { 98,  75,  71,  68, '\0'}
+#define PNG_cHRM png_byte png_cHRM[5] = { 99,  72,  82,  77, '\0'}
+#define PNG_gAMA png_byte png_gAMA[5] = {103,  65,  77,  65, '\0'}
+#define PNG_hIST png_byte png_hIST[5] = {104,  73,  83,  84, '\0'}
+#define PNG_iCCP png_byte png_iCCP[5] = {105,  67,  67,  80, '\0'}
+#define PNG_iTXt png_byte png_iTXt[5] = {105,  84,  88, 116, '\0'}
+#define PNG_oFFs png_byte png_oFFs[5] = {111,  70,  70, 115, '\0'}
+#define PNG_pCAL png_byte png_pCAL[5] = {112,  67,  65,  76, '\0'}
+#define PNG_sCAL png_byte png_sCAL[5] = {115,  67,  65,  76, '\0'}
+#define PNG_pHYs png_byte png_pHYs[5] = {112,  72,  89, 115, '\0'}
+#define PNG_sBIT png_byte png_sBIT[5] = {115,  66,  73,  84, '\0'}
+#define PNG_sPLT png_byte png_sPLT[5] = {115,  80,  76,  84, '\0'}
+#define PNG_sRGB png_byte png_sRGB[5] = {115,  82,  71,  66, '\0'}
+#define PNG_tEXt png_byte png_tEXt[5] = {116,  69,  88, 116, '\0'}
+#define PNG_tIME png_byte png_tIME[5] = {116,  73,  77,  69, '\0'}
+#define PNG_tRNS png_byte png_tRNS[5] = {116,  82,  78,  83, '\0'}
+#define PNG_zTXt png_byte png_zTXt[5] = {122,  84,  88, 116, '\0'}
 
 #ifdef PNG_USE_GLOBAL_ARRAYS
-PNG_EXPORT_VAR (const png_byte FARDATA) png_IHDR[5];
-PNG_EXPORT_VAR (const png_byte FARDATA) png_IDAT[5];
-PNG_EXPORT_VAR (const png_byte FARDATA) png_IEND[5];
-PNG_EXPORT_VAR (const png_byte FARDATA) png_PLTE[5];
-PNG_EXPORT_VAR (const png_byte FARDATA) png_bKGD[5];
-PNG_EXPORT_VAR (const png_byte FARDATA) png_cHRM[5];
-PNG_EXPORT_VAR (const png_byte FARDATA) png_gAMA[5];
-PNG_EXPORT_VAR (const png_byte FARDATA) png_hIST[5];
-PNG_EXPORT_VAR (const png_byte FARDATA) png_iCCP[5];
-PNG_EXPORT_VAR (const png_byte FARDATA) png_iTXt[5];
-PNG_EXPORT_VAR (const png_byte FARDATA) png_oFFs[5];
-PNG_EXPORT_VAR (const png_byte FARDATA) png_pCAL[5];
-PNG_EXPORT_VAR (const png_byte FARDATA) png_sCAL[5];
-PNG_EXPORT_VAR (const png_byte FARDATA) png_pHYs[5];
-PNG_EXPORT_VAR (const png_byte FARDATA) png_sBIT[5];
-PNG_EXPORT_VAR (const png_byte FARDATA) png_sPLT[5];
-PNG_EXPORT_VAR (const png_byte FARDATA) png_sRGB[5];
-PNG_EXPORT_VAR (const png_byte FARDATA) png_tEXt[5];
-PNG_EXPORT_VAR (const png_byte FARDATA) png_tIME[5];
-PNG_EXPORT_VAR (const png_byte FARDATA) png_tRNS[5];
-PNG_EXPORT_VAR (const png_byte FARDATA) png_zTXt[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5];
+PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5];
 #endif /* PNG_USE_GLOBAL_ARRAYS */
 
-
-/* Inline macros to do direct reads of bytes from the input buffer.  These
- * require that you are using an architecture that uses PNG byte ordering
- * (MSB first) and supports unaligned data storage.  I think that PowerPC
- * in big-endian mode and 680x0 are the only ones that will support this.
- * The x86 line of processors definitely do not.  The png_get_int_32()
- * routine also assumes we are using two's complement format for negative
- * values, which is almost certainly true.
- */
-#if defined(PNG_READ_BIG_ENDIAN_SUPPORTED)
-#  if defined(PNG_pCAL_SUPPORTED) || defined(PNG_oFFs_SUPPORTED)
-#    define png_get_int_32(buf) ( *((png_int_32p) (buf)))
-#  endif
-#  define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
-#  define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
-#else
-#  if defined(PNG_pCAL_SUPPORTED) || defined(PNG_oFFs_SUPPORTED)
-PNG_EXTERN png_int_32 png_get_int_32 PNGARG((png_bytep buf));
-#  endif
-PNG_EXTERN png_uint_32 png_get_uint_32 PNGARG((png_bytep buf));
-PNG_EXTERN png_uint_16 png_get_uint_16 PNGARG((png_bytep buf));
-#endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */
-PNG_EXTERN png_uint_32 png_get_uint_31 PNGARG((png_structp png_ptr,
-  png_bytep buf));
-
+#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
 /* Initialize png_ptr struct for reading, and allocate any other memory.
  * (old interface - DEPRECATED - use png_create_read_struct instead).
  */
@@ -2736,12 +2930,17 @@ extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr));
 #undef png_read_init
 #define png_read_init(png_ptr) png_read_init_3(&png_ptr, \
     PNG_LIBPNG_VER_STRING,  png_sizeof(png_struct));
+#endif
+
 extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr,
     png_const_charp user_png_ver, png_size_t png_struct_size));
+#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
 extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr,
     png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
     png_info_size));
+#endif
 
+#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
 /* Initialize png_ptr struct for writing, and allocate any other memory.
  * (old interface - DEPRECATED - use png_create_write_struct instead).
  */
@@ -2749,6 +2948,8 @@ extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr));
 #undef png_write_init
 #define png_write_init(png_ptr) png_write_init_3(&png_ptr, \
     PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
+#endif
+
 extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr,
     png_const_charp user_png_ver, png_size_t png_struct_size));
 extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr,
@@ -2848,23 +3049,6 @@ PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
 PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
 #endif
 
-
-/* Place a 32-bit number into a buffer in PNG byte order (big-endian).
- * The only currently known PNG chunks that use signed numbers are
- * the ancillary extension chunks, oFFs and pCAL.
- */
-PNG_EXTERN void png_save_uint_32 PNGARG((png_bytep buf, png_uint_32 i));
-
-#if defined(PNG_WRITE_pCAL_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
-PNG_EXTERN void png_save_int_32 PNGARG((png_bytep buf, png_int_32 i));
-#endif
-
-/* Place a 16-bit number into a buffer in PNG byte order.
- * The parameter is declared unsigned int, not png_uint_16,
- * just to avoid potential problems on pre-ANSI C compilers.
- */
-PNG_EXTERN void png_save_uint_16 PNGARG((png_bytep buf, unsigned int i));
-
 /* simple function to write the signature */
 PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr));
 
@@ -3090,7 +3274,7 @@ PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
     defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
 PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
-   png_bytep row, png_uint_32 flags, png_uint_32 transformations));
+   png_bytep row, png_uint_32 flags));
 #endif
 
 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
@@ -3345,9 +3529,34 @@ PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
 #endif
 
 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
+#if defined(PNG_MMX_CODE_SUPPORTED)
 /* png.c */ /* PRIVATE */
 PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr));
 #endif
+#endif
+
+#if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
+PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr,
+png_infop info_ptr));
+
+PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr,
+png_infop info_ptr));
+
+PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr,
+png_infop info_ptr));
+
+PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr,
+png_infop info_ptr));
+
+PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr,
+png_infop info_ptr));
+
+#if defined(PNG_pHYs_SUPPORTED)
+PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr,
+png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
+#endif /* PNG_pHYs_SUPPORTED */
+#endif  /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
+
 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
 
 #endif /* PNG_INTERNAL */

pngconf.h

@@ -1,9 +1,9 @@
 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng version 1.2.8beta1 - November 1, 2004
+ * libpng version 1.0.37 - May 9, 2008
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2004 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2008 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  */
@@ -17,10 +17,65 @@
 #ifndef PNGCONF_H
 #define PNGCONF_H
 
-#ifdef PNG_USER_CONFIG
-#include "pngusr.h"
+#define PNG_1_0_X
+
+/* 
+ * PNG_USER_CONFIG has to be defined on the compiler command line. This
+ * includes the resource compiler for Windows DLL configurations.
+ */
+
+/* PNG_CONFIGURE_LIBPNG is set by the "configure" script. */
+#ifdef PNG_CONFIGURE_LIBPNG
+#ifdef HAVE_CONFIG_H
+#include "config.h"
 #endif
-#define PNG_1_2_X
+#endif
+
+/*
+ * Added at libpng-1.2.8
+ *  
+ * If you create a private DLL you need to define in "pngusr.h" the followings:
+ * #define PNG_USER_PRIVATEBUILD <Describes by whom and why this version of
+ *        the DLL was built>
+ *  e.g. #define PNG_USER_PRIVATEBUILD "Build by MyCompany for xyz reasons."
+ * #define PNG_USER_DLLFNAME_POSTFIX <two-letter postfix that serve to
+ *        distinguish your DLL from those of the official release. These
+ *        correspond to the trailing letters that come after the version
+ *        number and must match your private DLL name>
+ *  e.g. // private DLL "libpng13gx.dll"
+ *       #define PNG_USER_DLLFNAME_POSTFIX "gx"
+ * 
+ * The following macros are also at your disposal if you want to complete the 
+ * DLL VERSIONINFO structure.
+ * - PNG_USER_VERSIONINFO_COMMENTS
+ * - PNG_USER_VERSIONINFO_COMPANYNAME
+ * - PNG_USER_VERSIONINFO_LEGALTRADEMARKS
+ */
+
+#ifdef __STDC__
+#ifdef SPECIALBUILD
+#  pragma message("PNG_LIBPNG_SPECIALBUILD (and deprecated SPECIALBUILD)\
+ are now LIBPNG reserved macros. Use PNG_USER_PRIVATEBUILD instead.")
+#endif
+
+#ifdef PRIVATEBUILD
+# pragma message("PRIVATEBUILD is deprecated.\
+ Use PNG_USER_PRIVATEBUILD instead.")
+# define PNG_USER_PRIVATEBUILD PRIVATEBUILD
+#endif
+#endif /* __STDC__ */
+
+#ifndef PNG_VERSION_INFO_ONLY
+
+/* End of material added to libpng-1.2.8 */
+
+/* Added at libpng-1.2.19, removed at libpng-1.2.20 because it caused trouble
+   Restored at libpng-1.2.21 */
+#if !defined(PNG_NO_WARN_UNINITIALIZED_ROW) && \
+    !defined(PNG_WARN_UNINITIALIZED_ROW)
+#  define PNG_WARN_UNINITIALIZED_ROW 1
+#endif
+/* End of material added at libpng-1.2.19/1.2.21 */
 
 /* This is the size of the compression buffer, and thus the size of
  * an IDAT chunk.  Make this whatever size you feel is best for your
@@ -223,6 +278,7 @@
 #  define PNGARG(arglist) arglist
 #endif /* _NO_PROTO */
 
+
 #endif /* OF */
 
 #endif /* PNGARG */
@@ -261,7 +317,7 @@
      /* If you encounter a compiler error here, see the explanation
       * near the end of INSTALL.
       */
-         __png.h__ already includes setjmp.h;
+         __pngconf.h__ already includes setjmp.h;
          __dont__ include it again.;
 #    endif
 #  endif /* __linux__ */
@@ -271,7 +327,9 @@
 
 #  ifdef __linux__
 #    ifdef PNG_SAVE_BSD_SOURCE
-#      define _BSD_SOURCE
+#      ifndef _BSD_SOURCE
+#        define _BSD_SOURCE
+#      endif
 #      undef PNG_SAVE_BSD_SOURCE
 #    endif
 #  endif /* __linux__ */
@@ -410,21 +468,33 @@
  */
 
 /* The size of the png_text structure changed in libpng-1.0.6 when
- * iTXt is supported.  It is turned off by default, to support old apps
- * that malloc the png_text structure instead of calling png_set_text()
- * and letting libpng malloc it.  It will be turned on by default in
- * libpng-1.3.0.
+ * iTXt support was added.  iTXt support was turned off by default through
+ * libpng-1.2.x, to support old apps that malloc the png_text structure
+ * instead of calling png_set_text() and letting libpng malloc it.  It
+ * was turned on by default in libpng-1.3.0.
  */
 
-#ifndef PNG_iTXt_SUPPORTED
-#  if !defined(PNG_READ_iTXt_SUPPORTED) && !defined(PNG_NO_READ_iTXt)
+#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
+#  ifndef PNG_NO_iTXt_SUPPORTED
+#    define PNG_NO_iTXt_SUPPORTED
+#  endif
+#  ifndef PNG_NO_READ_iTXt
 #    define PNG_NO_READ_iTXt
 #  endif
-#  if !defined(PNG_WRITE_iTXt_SUPPORTED) && !defined(PNG_NO_WRITE_iTXt)
+#  ifndef PNG_NO_WRITE_iTXt
 #    define PNG_NO_WRITE_iTXt
 #  endif
 #endif
 
+#if !defined(PNG_NO_iTXt_SUPPORTED)
+#  if !defined(PNG_READ_iTXt_SUPPORTED) && !defined(PNG_NO_READ_iTXt)
+#    define PNG_READ_iTXt
+#  endif
+#  if !defined(PNG_WRITE_iTXt_SUPPORTED) && !defined(PNG_NO_WRITE_iTXt)
+#    define PNG_WRITE_iTXt
+#  endif
+#endif
+
 /* The following support, added after version 1.0.0, can be turned off here en
  * masse by defining PNG_LEGACY_SUPPORTED in case you need binary compatibility
  * with old applications that require the length of png_struct and png_info
@@ -529,24 +599,26 @@
 #endif /* PNG_READ_TRANSFORMS_SUPPORTED */
 
 #if !defined(PNG_NO_PROGRESSIVE_READ) && \
- !defined(PNG_PROGRESSIVE_READ_NOT_SUPPORTED)  /* if you don't do progressive */
-#  define PNG_PROGRESSIVE_READ_SUPPORTED     /* reading.  This is not talking */
-#endif                               /* about interlacing capability!  You'll */
-              /* still have interlacing unless you change the following line: */
+ !defined(PNG_PROGRESSIVE_READ_SUPPORTED) /* if you don't do progressive   */
+#  define PNG_PROGRESSIVE_READ_SUPPORTED  /* reading.  This is not talking */
+#endif                            /* about interlacing capability!  You'll */
+           /* still have interlacing unless you change the following line: */
 
-#define PNG_READ_INTERLACING_SUPPORTED /* required for PNG-compliant decoders */
+#define PNG_READ_INTERLACING_SUPPORTED /* required in PNG-compliant decoders */
 
 #ifndef PNG_NO_READ_COMPOSITE_NODIV
 #  ifndef PNG_NO_READ_COMPOSITED_NODIV  /* libpng-1.0.x misspelling */
-#    define PNG_READ_COMPOSITE_NODIV_SUPPORTED   /* well tested on Intel, SGI */
+#    define PNG_READ_COMPOSITE_NODIV_SUPPORTED  /* well tested on Intel, SGI */
 #  endif
 #endif
 
+#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
 /* Deprecated, will be removed from version 2.0.0.
    Use PNG_MNG_FEATURES_SUPPORTED instead. */
 #ifndef PNG_NO_READ_EMPTY_PLTE
 #  define PNG_READ_EMPTY_PLTE_SUPPORTED
 #endif
+#endif
 
 #endif /* PNG_READ_SUPPORTED */
 
@@ -590,11 +662,15 @@
 #  endif
 #endif /* PNG_WRITE_TRANSFORMS_SUPPORTED */
 
+#if !defined(PNG_NO_WRITE_INTERLACING_SUPPORTED) && \
+    !defined(PNG_WRITE_INTERLACING_SUPPORTED)
 #define PNG_WRITE_INTERLACING_SUPPORTED  /* not required for PNG-compliant
                                             encoders, but can cause trouble
                                             if left undefined */
+#endif
 
 #if !defined(PNG_NO_WRITE_WEIGHTED_FILTER) && \
+    !defined(PNG_WRITE_WEIGHTED_FILTER) && \
      defined(PNG_FLOATING_POINT_SUPPORTED)
 #  define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
 #endif
@@ -603,10 +679,12 @@
 #  define PNG_WRITE_FLUSH_SUPPORTED
 #endif
 
+#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
 /* Deprecated, see PNG_MNG_FEATURES_SUPPORTED, above */
 #ifndef PNG_NO_WRITE_EMPTY_PLTE
 #  define PNG_WRITE_EMPTY_PLTE_SUPPORTED
 #endif
+#endif
 
 #endif /* PNG_WRITE_SUPPORTED */
 
@@ -648,21 +726,46 @@
 #endif
 
 /* PNG_ASSEMBLER_CODE was enabled by default in version 1.2.0 
-   even when PNG_USE_PNGVCRD or PNG_USE_PNGGCCRD is not defined */
+ * and removed from version 1.2.20.  The following will be removed
+ * from libpng-1.4.0
+*/
+
+#if defined(PNG_READ_SUPPORTED) && !defined(PNG_NO_OPTIMIZED_CODE)
+#  ifndef PNG_OPTIMIZED_CODE_SUPPORTED
+#    define PNG_OPTIMIZED_CODE_SUPPORTED
+#  endif
+#endif
+
 #if defined(PNG_READ_SUPPORTED) && !defined(PNG_NO_ASSEMBLER_CODE)
 #  ifndef PNG_ASSEMBLER_CODE_SUPPORTED
 #    define PNG_ASSEMBLER_CODE_SUPPORTED
 #  endif
+
+#  if defined(__GNUC__) && defined(__x86_64__) && (__GNUC__ < 4)
+     /* work around 64-bit gcc compiler bugs in gcc-3.x */
+#    if !defined(PNG_MMX_CODE_SUPPORTED) && !defined(PNG_NO_MMX_CODE)
+#      define PNG_NO_MMX_CODE
+#    endif
+#  endif
+
+#  if defined(__APPLE__)
+#    if !defined(PNG_MMX_CODE_SUPPORTED) && !defined(PNG_NO_MMX_CODE)
+#      define PNG_NO_MMX_CODE
+#    endif
+#  endif
+
+#  if (defined(__MWERKS__) && ((__MWERKS__ < 0x0900) || macintosh))
+#    if !defined(PNG_MMX_CODE_SUPPORTED) && !defined(PNG_NO_MMX_CODE)
+#      define PNG_NO_MMX_CODE
+#    endif
+#  endif
+
 #  if !defined(PNG_MMX_CODE_SUPPORTED) && !defined(PNG_NO_MMX_CODE)
 #    define PNG_MMX_CODE_SUPPORTED
 #  endif
-#endif
 
-/* If you are sure that you don't need thread safety and you are compiling
-   with PNG_USE_PNGCCRD for an MMX application, you can define this for
-   faster execution.  See pnggccrd.c.
-#define PNG_THREAD_UNSAFE_OK
-*/
+#endif
+/* end of obsolete code to be removed from libpng-1.4.0 */
 
 #if !defined(PNG_1_0_X)
 #if !defined(PNG_NO_USER_MEM) && !defined(PNG_USER_MEM_SUPPORTED)
@@ -1122,6 +1225,9 @@ typedef double          FAR * FAR * png_doublepp;
 /* Pointers to pointers to pointers; i.e., pointer to array */
 typedef char            FAR * FAR * FAR * png_charppp;
 
+#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
+/* SPC -  Is this stuff deprecated? */
+/* It'll be removed as of libpng-1.3.0 - GR-P */
 /* libpng typedefs for types in zlib. If zlib changes
  * or another compression library is used, then change these.
  * Eliminates need to change all the source files.
@@ -1129,6 +1235,7 @@ typedef char            FAR * FAR * FAR * png_charppp;
 typedef charf *         png_zcharp;
 typedef charf * FAR *   png_zcharpp;
 typedef z_stream FAR *  png_zstreamp;
+#endif /* (PNG_1_0_X) || defined(PNG_1_2_X) */
 
 /*
  * Define PNG_BUILD_DLL if the module being built is a Windows
@@ -1180,7 +1287,8 @@ typedef z_stream FAR *  png_zstreamp;
  * but might be required for some pre-1.0.5c applications.
  */
 #if !defined(PNG_USE_LOCAL_ARRAYS) && !defined(PNG_USE_GLOBAL_ARRAYS)
-#  if defined(PNG_NO_GLOBAL_ARRAYS) || (defined(__GNUC__) && defined(PNG_DLL))
+#  if defined(PNG_NO_GLOBAL_ARRAYS) || \
+      (defined(__GNUC__) && defined(PNG_DLL)) || defined(_MSC_VER)
 #    define PNG_USE_LOCAL_ARRAYS
 #  else
 #    define PNG_USE_GLOBAL_ARRAYS
@@ -1275,6 +1383,17 @@ typedef z_stream FAR *  png_zstreamp;
 #  define PNG_IMPEXP
 #endif
 
+#ifdef PNG_BUILDSYMS
+#  ifndef PNG_EXPORT
+#    define PNG_EXPORT(type,symbol) PNG_FUNCTION_EXPORT symbol END
+#  endif
+#  ifdef PNG_USE_GLOBAL_ARRAYS
+#    ifndef PNG_EXPORT_VAR
+#      define PNG_EXPORT_VAR(type) PNG_DATA_EXPORT
+#    endif
+#  endif
+#endif
+
 #ifndef PNG_EXPORT
 #  define PNG_EXPORT(type,symbol) PNG_IMPEXP type PNGAPI symbol
 #endif
@@ -1306,8 +1425,7 @@ typedef z_stream FAR *  png_zstreamp;
 #  define NOCHECK 0
 #  define CVT_PTR(ptr) (png_far_to_near(png_ptr,ptr,CHECK))
 #  define CVT_PTR_NOCHECK(ptr) (png_far_to_near(png_ptr,ptr,NOCHECK))
-#  define png_strcpy  _fstrcpy
-#  define png_strncpy _fstrncpy   /* Added to v 1.2.6 */
+#  define png_snprintf _fsnprintf   /* Added to v 1.2.19 */
 #  define png_strlen  _fstrlen
 #  define png_memcmp  _fmemcmp    /* SJT: added */
 #  define png_memcpy  _fmemcpy
@@ -1315,8 +1433,27 @@ typedef z_stream FAR *  png_zstreamp;
 #else /* use the usual functions */
 #  define CVT_PTR(ptr)         (ptr)
 #  define CVT_PTR_NOCHECK(ptr) (ptr)
-#  define png_strcpy  strcpy
-#  define png_strncpy strncpy     /* Added to v 1.2.6 */
+#  ifndef PNG_NO_SNPRINTF
+#    ifdef _MSC_VER
+#      define png_snprintf _snprintf   /* Added to v 1.2.19 */
+#      define png_snprintf2 _snprintf
+#      define png_snprintf6 _snprintf
+#    else
+#      define png_snprintf snprintf   /* Added to v 1.2.19 */
+#      define png_snprintf2 snprintf
+#      define png_snprintf6 snprintf
+#    endif
+#  else
+     /* You don't have or don't want to use snprintf().  Caution: Using
+      * sprintf instead of snprintf exposes your application to accidental
+      * or malevolent buffer overflows.  If you don't have snprintf()
+      * as a general rule you should provide one (you can get one from
+      * Portable OpenSSH). */
+#    define png_snprintf(s1,n,fmt,x1) sprintf(s1,fmt,x1)
+#    define png_snprintf2(s1,n,fmt,x1,x2) sprintf(s1,fmt,x1,x2)
+#    define png_snprintf6(s1,n,fmt,x1,x2,x3,x4,x5,x6) \
+        sprintf(s1,fmt,x1,x2,x3,x4,x5,x6)
+#  endif
 #  define png_strlen  strlen
 #  define png_memcmp  memcmp      /* SJT: added */
 #  define png_memcpy  memcpy
@@ -1332,46 +1469,7 @@ typedef z_stream FAR *  png_zstreamp;
 #  define PNG_ZBUF_SIZE 65536L
 #endif
 
-#ifdef PNG_READ_SUPPORTED
-/* Prior to libpng-1.0.9, this block was in pngasmrd.h */
-#if defined(PNG_INTERNAL)
-
-/* These are the default thresholds before the MMX code kicks in; if either
- * rowbytes or bitdepth is below the threshold, plain C code is used.  These
- * can be overridden at runtime via the png_set_mmx_thresholds() call in
- * libpng 1.2.0 and later.  The values below were chosen by Intel.
- */
-
-#ifndef PNG_MMX_ROWBYTES_THRESHOLD_DEFAULT
-#  define PNG_MMX_ROWBYTES_THRESHOLD_DEFAULT  128  /*  >=  */
-#endif
-#ifndef PNG_MMX_BITDEPTH_THRESHOLD_DEFAULT
-#  define PNG_MMX_BITDEPTH_THRESHOLD_DEFAULT  9    /*  >=  */   
-#endif
-
-/* Set this in the makefile for VC++ on Pentium, not here. */
-/* Platform must be Pentium.  Makefile must assemble and load pngvcrd.c .
- * MMX will be detected at run time and used if present.
- */
-#ifdef PNG_USE_PNGVCRD
-#  define PNG_HAVE_ASSEMBLER_COMBINE_ROW
-#  define PNG_HAVE_ASSEMBLER_READ_INTERLACE
-#  define PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
-#endif
-
-/* Set this in the makefile for gcc/as on Pentium, not here. */
-/* Platform must be Pentium.  Makefile must assemble and load pnggccrd.c .
- * MMX will be detected at run time and used if present.
- */
-#ifdef PNG_USE_PNGGCCRD
-#  define PNG_HAVE_ASSEMBLER_COMBINE_ROW
-#  define PNG_HAVE_ASSEMBLER_READ_INTERLACE
-#  define PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
-#endif
-/* - see pnggccrd.c for info about what is currently enabled */
-
-#endif /* PNG_INTERNAL */
-#endif /* PNG_READ_SUPPORTED */
+/* Added at libpng-1.2.8 */
+#endif /* PNG_VERSION_INFO_ONLY */
 
 #endif /* PNGCONF_H */
-

pngerror.c

@@ -1,9 +1,9 @@
 
 /* pngerror.c - stub functions for i/o and memory allocation
  *
- * libpng version 1.2.8beta1 - November 1, 2004
+ * Last changed in libpng 1.2.22 [October 13, 2007]
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2004 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2007 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
@@ -16,50 +16,58 @@
 #define PNG_INTERNAL
 #include "png.h"
 
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
 static void /* PRIVATE */
 png_default_error PNGARG((png_structp png_ptr,
   png_const_charp error_message));
+#ifndef PNG_NO_WARNINGS
 static void /* PRIVATE */
 png_default_warning PNGARG((png_structp png_ptr,
   png_const_charp warning_message));
+#endif /* PNG_NO_WARNINGS */
 
 /* This function is called whenever there is a fatal error.  This function
  * should not be changed.  If there is a need to handle errors differently,
  * you should supply a replacement error function and use png_set_error_fn()
  * to replace the error function at run-time.
  */
+#ifndef PNG_NO_ERROR_TEXT
 void PNGAPI
 png_error(png_structp png_ptr, png_const_charp error_message)
 {
 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
    char msg[16];
-   if (png_ptr->flags&(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
+   if (png_ptr != NULL)
    {
-     if (*error_message == '#')
+     if (png_ptr->flags&
+       (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
      {
-         int offset;
-         for (offset=1; offset<15; offset++)
-            if (*(error_message+offset) == ' ')
-                break;
-         if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
-         {
-            int i;
-            for (i=0; i<offset-1; i++)
-               msg[i]=error_message[i+1];
-            msg[i]='\0';
-            error_message=msg;
-         }
-         else
-            error_message+=offset;
-     }
-     else
-     {
-         if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
-         {
-            msg[0]='0';        
-            msg[1]='\0';
-            error_message=msg;
-         }
+       if (*error_message == '#')
+       {
+           int offset;
+           for (offset=1; offset<15; offset++)
+              if (*(error_message+offset) == ' ')
+                  break;
+           if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
+           {
+              int i;
+              for (i=0; i<offset-1; i++)
+                 msg[i]=error_message[i+1];
+              msg[i]='\0';
+              error_message=msg;
+           }
+           else
+              error_message+=offset;
+       }
+       else
+       {
+           if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
+           {
+              msg[0]='0';
+              msg[1]='\0';
+              error_message=msg;
+           }
+       }
      }
    }
 #endif
@@ -70,7 +78,20 @@ png_error(png_structp png_ptr, png_const_charp error_message)
       use the default handler, which will not return. */
    png_default_error(png_ptr, error_message);
 }
+#else
+void PNGAPI
+png_err(png_structp png_ptr)
+{
+   if (png_ptr != NULL && png_ptr->error_fn != NULL)
+      (*(png_ptr->error_fn))(png_ptr, '\0');
 
+   /* If the custom handler doesn't exist, or if it returns,
+      use the default handler, which will not return. */
+   png_default_error(png_ptr, '\0');
+}
+#endif /* PNG_NO_ERROR_TEXT */
+
+#ifndef PNG_NO_WARNINGS
 /* This function is called whenever there is a non-fatal error.  This function
  * should not be changed.  If there is a need to handle warnings differently,
  * you should supply a replacement warning function and use
@@ -80,22 +101,28 @@ void PNGAPI
 png_warning(png_structp png_ptr, png_const_charp warning_message)
 {
    int offset = 0;
-#ifdef PNG_ERROR_NUMBERS_SUPPORTED
-   if (png_ptr->flags&(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
-#endif
+   if (png_ptr != NULL)
    {
-     if (*warning_message == '#')
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+   if (png_ptr->flags&
+     (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
+#endif
      {
-         for (offset=1; offset<15; offset++)
-            if (*(warning_message+offset) == ' ')
-                break;
+       if (*warning_message == '#')
+       {
+           for (offset=1; offset<15; offset++)
+              if (*(warning_message+offset) == ' ')
+                  break;
+       }
      }
+     if (png_ptr != NULL && png_ptr->warning_fn != NULL)
+        (*(png_ptr->warning_fn))(png_ptr, warning_message+offset);
    }
-   if (png_ptr != NULL && png_ptr->warning_fn != NULL)
-      (*(png_ptr->warning_fn))(png_ptr, warning_message+offset);
    else
       png_default_warning(png_ptr, warning_message+offset);
 }
+#endif /* PNG_NO_WARNINGS */
+
 
 /* These utilities are used internally to build an error message that relates
  * to the current chunk.  The chunk name comes from png_ptr->chunk_name,
@@ -109,6 +136,9 @@ static PNG_CONST char png_digit[16] = {
    'A', 'B', 'C', 'D', 'E', 'F'
 };
 
+#define PNG_MAX_ERROR_TEXT 64
+
+#if !defined(PNG_NO_WARNINGS) || !defined(PNG_NO_ERROR_TEXT)
 static void /* PRIVATE */
 png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp
    error_message)
@@ -132,31 +162,47 @@ png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp
    }
 
    if (error_message == NULL)
-      buffer[iout] = 0;
+      buffer[iout] = '\0';
    else
    {
       buffer[iout++] = ':';
       buffer[iout++] = ' ';
-      png_strncpy(buffer+iout, error_message, 63);
-      buffer[iout+63] = 0;
+      png_memcpy(buffer+iout, error_message, PNG_MAX_ERROR_TEXT);
+      buffer[iout+PNG_MAX_ERROR_TEXT-1] = '\0';
    }
 }
 
+#ifdef PNG_READ_SUPPORTED
 void PNGAPI
 png_chunk_error(png_structp png_ptr, png_const_charp error_message)
 {
-   char msg[18+64];
-   png_format_buffer(png_ptr, msg, error_message);
-   png_error(png_ptr, msg);
+   char msg[18+PNG_MAX_ERROR_TEXT];
+   if (png_ptr == NULL)
+     png_error(png_ptr, error_message);
+   else
+   {
+     png_format_buffer(png_ptr, msg, error_message);
+     png_error(png_ptr, msg);
+   }
 }
+#endif /* PNG_READ_SUPPORTED */
+#endif /* !defined(PNG_NO_WARNINGS) || !defined(PNG_NO_ERROR_TEXT) */
 
+#ifndef PNG_NO_WARNINGS
 void PNGAPI
 png_chunk_warning(png_structp png_ptr, png_const_charp warning_message)
 {
-   char msg[18+64];
-   png_format_buffer(png_ptr, msg, warning_message);
-   png_warning(png_ptr, msg);
+   char msg[18+PNG_MAX_ERROR_TEXT];
+   if (png_ptr == NULL)
+     png_warning(png_ptr, warning_message);
+   else
+   {
+     png_format_buffer(png_ptr, msg, warning_message);
+     png_warning(png_ptr, msg);
+   }
 }
+#endif /* PNG_NO_WARNINGS */
+
 
 /* This is the default error handling function.  Note that replacements for
  * this function MUST NOT RETURN, or the program will likely crash.  This
@@ -193,27 +239,27 @@ png_default_error(png_structp png_ptr, png_const_charp error_message)
 #endif
 
 #ifdef PNG_SETJMP_SUPPORTED
+   if (png_ptr)
+   {
 #  ifdef USE_FAR_KEYWORD
    {
       jmp_buf jmpbuf;
-      png_memcpy(jmpbuf,png_ptr->jmpbuf,png_sizeof(jmp_buf));
+      png_memcpy(jmpbuf, png_ptr->jmpbuf, png_sizeof(jmp_buf));
       longjmp(jmpbuf, 1);
    }
 #  else
    longjmp(png_ptr->jmpbuf, 1);
-# endif
+#  endif
+   }
 #else
-   /* make compiler happy */ ;
-   if (png_ptr)
    PNG_ABORT();
 #endif
 #ifdef PNG_NO_CONSOLE_IO
-   /* make compiler happy */ ;
-   if (&error_message != NULL)
-      return;
+   error_message = error_message; /* make compiler happy */
 #endif
 }
 
+#ifndef PNG_NO_WARNINGS
 /* This function is called when there is a warning, but the library thinks
  * it can continue anyway.  Replacement functions don't have to do anything
  * here if you don't want them to.  In the default configuration, png_ptr is
@@ -247,14 +293,11 @@ png_default_warning(png_structp png_ptr, png_const_charp warning_message)
 #  endif
      fprintf(stderr, "libpng warning: %s\n", warning_message);
 #else
-   /* make compiler happy */ ;
-   if (warning_message)
-     return;
+   warning_message = warning_message; /* make compiler happy */
 #endif
-   /* make compiler happy */ ;
-   if (png_ptr)
-      return;
+   png_ptr = png_ptr; /* make compiler happy */
 }
+#endif /* PNG_NO_WARNINGS */
 
 /* This function is called when the application wants to use another method
  * of handling errors and warnings.  Note that the error function MUST NOT
@@ -265,6 +308,8 @@ void PNGAPI
 png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
    png_error_ptr error_fn, png_error_ptr warning_fn)
 {
+   if (png_ptr == NULL)
+      return;
    png_ptr->error_ptr = error_ptr;
    png_ptr->error_fn = error_fn;
    png_ptr->warning_fn = warning_fn;
@@ -278,6 +323,8 @@ png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
 png_voidp PNGAPI
 png_get_error_ptr(png_structp png_ptr)
 {
+   if (png_ptr == NULL)
+      return NULL;
    return ((png_voidp)png_ptr->error_ptr);
 }
 
@@ -293,3 +340,4 @@ png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode)
    }
 }
 #endif
+#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */

pngget.c

@@ -1,9 +1,9 @@
 
 /* pngget.c - retrieval of values from info struct
  *
- * libpng 1.2.8beta1 - November 1, 2004
+ * Last changed in libpng 1.2.15 January 5, 2007
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2004 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2007 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  */
@@ -11,6 +11,8 @@
 #define PNG_INTERNAL
 #include "png.h"
 
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
+
 png_uint_32 PNGAPI
 png_get_valid(png_structp png_ptr, png_infop info_ptr, png_uint_32 flag)
 {
@@ -510,8 +512,11 @@ png_get_sPLT(png_structp png_ptr, png_infop info_ptr,
              png_sPLT_tpp spalettes)
 {
    if (png_ptr != NULL && info_ptr != NULL && spalettes != NULL)
+   {
      *spalettes = info_ptr->splt_palettes;
-   return ((png_uint_32)info_ptr->splt_palettes_num);
+     return ((png_uint_32)info_ptr->splt_palettes_num);
+   }
+   return (0);
 }
 #endif
 
@@ -798,8 +803,11 @@ png_get_unknown_chunks(png_structp png_ptr, png_infop info_ptr,
              png_unknown_chunkpp unknowns)
 {
    if (png_ptr != NULL && info_ptr != NULL && unknowns != NULL)
+   {
      *unknowns = info_ptr->unknown_chunks;
-   return ((png_uint_32)info_ptr->unknown_chunks_num);
+     return ((png_uint_32)info_ptr->unknown_chunks_num);
+   }
+   return (0);
 }
 #endif
 
@@ -827,94 +835,52 @@ png_get_compression_buffer_size(png_structp png_ptr)
 }
 #endif
 
-#ifndef PNG_1_0_X
 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED
+#ifndef PNG_1_0_X
 /* this function was added to libpng 1.2.0 and should exist by default */
 png_uint_32 PNGAPI
 png_get_asm_flags (png_structp png_ptr)
 {
-    return (png_uint_32)(png_ptr? png_ptr->asm_flags : 0L);
+    /* obsolete, to be removed from libpng-1.4.0 */
+    return (png_ptr? 0L: 0L);
 }
 
 /* this function was added to libpng 1.2.0 and should exist by default */
 png_uint_32 PNGAPI
 png_get_asm_flagmask (int flag_select)
 {
-    png_uint_32 settable_asm_flags = 0;
-
-    if (flag_select & PNG_SELECT_READ)
-        settable_asm_flags |=
-          PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  |
-          PNG_ASM_FLAG_MMX_READ_INTERLACE    |
-          PNG_ASM_FLAG_MMX_READ_FILTER_SUB   |
-          PNG_ASM_FLAG_MMX_READ_FILTER_UP    |
-          PNG_ASM_FLAG_MMX_READ_FILTER_AVG   |
-          PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ;
-          /* no non-MMX flags yet */
-
-#if 0
-    /* GRR:  no write-flags yet, either, but someday... */
-    if (flag_select & PNG_SELECT_WRITE)
-        settable_asm_flags |=
-          PNG_ASM_FLAG_MMX_WRITE_ [whatever] ;
-#endif /* 0 */
-
-    return settable_asm_flags;  /* _theoretically_ settable capabilities only */
+    /* obsolete, to be removed from libpng-1.4.0 */
+    flag_select=flag_select;
+    return 0L;
 }
-#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
 
-
-#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
     /* GRR:  could add this:   && defined(PNG_MMX_CODE_SUPPORTED) */
 /* this function was added to libpng 1.2.0 */
 png_uint_32 PNGAPI
 png_get_mmx_flagmask (int flag_select, int *compilerID)
 {
-    png_uint_32 settable_mmx_flags = 0;
-
-    if (flag_select & PNG_SELECT_READ)
-        settable_mmx_flags |=
-          PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  |
-          PNG_ASM_FLAG_MMX_READ_INTERLACE    |
-          PNG_ASM_FLAG_MMX_READ_FILTER_SUB   |
-          PNG_ASM_FLAG_MMX_READ_FILTER_UP    |
-          PNG_ASM_FLAG_MMX_READ_FILTER_AVG   |
-          PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ;
-#if 0
-    /* GRR:  no MMX write support yet, but someday... */
-    if (flag_select & PNG_SELECT_WRITE)
-        settable_mmx_flags |=
-          PNG_ASM_FLAG_MMX_WRITE_ [whatever] ;
-#endif /* 0 */
-
-    if (compilerID != NULL) {
-#ifdef PNG_USE_PNGVCRD
-        *compilerID = 1;    /* MSVC */
-#else
-#ifdef PNG_USE_PNGGCCRD
-        *compilerID = 2;    /* gcc/gas */
-#else
-        *compilerID = -1;   /* unknown (i.e., no asm/MMX code compiled) */
-#endif
-#endif
-    }
-
-    return settable_mmx_flags;  /* _theoretically_ settable capabilities only */
+    /* obsolete, to be removed from libpng-1.4.0 */
+    flag_select=flag_select;
+    *compilerID = -1;   /* unknown (i.e., no asm/MMX code compiled) */
+    return 0L;
 }
 
 /* this function was added to libpng 1.2.0 */
 png_byte PNGAPI
 png_get_mmx_bitdepth_threshold (png_structp png_ptr)
 {
-    return (png_byte)(png_ptr? png_ptr->mmx_bitdepth_threshold : 0);
+    /* obsolete, to be removed from libpng-1.4.0 */
+    return (png_ptr? 0: 0);
 }
 
 /* this function was added to libpng 1.2.0 */
 png_uint_32 PNGAPI
 png_get_mmx_rowbytes_threshold (png_structp png_ptr)
 {
-    return (png_uint_32)(png_ptr? png_ptr->mmx_rowbytes_threshold : 0L);
+    /* obsolete, to be removed from libpng-1.4.0 */
+    return (png_ptr? 0L: 0L);
 }
+#endif /* ?PNG_1_0_X */
 #endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
 
 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
@@ -930,5 +896,6 @@ png_get_user_height_max (png_structp png_ptr)
     return (png_ptr? png_ptr->user_height_max : 0);
 }
 #endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
+ 
 
-#endif /* ?PNG_1_0_X */
+#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */

pngmem.c

@@ -1,9 +1,9 @@
 
 /* pngmem.c - stub functions for memory allocation
  *
- * libpng version 1.2.8beta1 - November 1, 2004
+ * Last changed in libpng 1.2.27 [April 29, 2008]
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2004 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2008 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
@@ -17,6 +17,8 @@
 #define PNG_INTERNAL
 #include "png.h"
 
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
+
 /* Borland DOS special memory handler */
 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
 /* if you change this, be sure to change the one in png.h also */
@@ -135,6 +137,9 @@ png_malloc_default(png_structp png_ptr, png_uint_32 size)
    png_voidp ret;
 #endif /* PNG_USER_MEM_SUPPORTED */
 
+   if (png_ptr == NULL || size == 0)
+      return (NULL);
+
 #ifdef PNG_MAX_MALLOC_64K
    if (size > (png_uint_32)65536L)
    {
@@ -288,6 +293,8 @@ png_free_default(png_structp png_ptr, png_voidp ptr)
 {
 #endif /* PNG_USER_MEM_SUPPORTED */
 
+   if(png_ptr == NULL || ptr == NULL) return;
+
    if (png_ptr->offset_table != NULL)
    {
       int i;
@@ -449,7 +456,7 @@ png_malloc_default(png_structp png_ptr, png_uint_32 size)
    if (size > (png_uint_32)65536L)
    {
 #ifndef PNG_USER_MEM_SUPPORTED
-      if(png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+      if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
          png_error(png_ptr, "Cannot Allocate > 64K");
       else
 #endif
@@ -534,8 +541,10 @@ png_voidp PNGAPI
 png_malloc_warn(png_structp png_ptr, png_uint_32 size)
 {
    png_voidp ptr;
-   png_uint_32 save_flags=png_ptr->flags;
+   png_uint_32 save_flags;
+   if(png_ptr == NULL) return (NULL);
 
+   save_flags=png_ptr->flags;
    png_ptr->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
    ptr = (png_voidp)png_malloc((png_structp)png_ptr, size);
    png_ptr->flags=save_flags;
@@ -578,9 +587,11 @@ void PNGAPI
 png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr
   malloc_fn, png_free_ptr free_fn)
 {
+   if(png_ptr != NULL) {
    png_ptr->mem_ptr = mem_ptr;
    png_ptr->malloc_fn = malloc_fn;
    png_ptr->free_fn = free_fn;
+   }
 }
 
 /* This function returns a pointer to the mem_ptr associated with the user
@@ -590,6 +601,8 @@ png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr
 png_voidp PNGAPI
 png_get_mem_ptr(png_structp png_ptr)
 {
+   if(png_ptr == NULL) return (NULL);
    return ((png_voidp)png_ptr->mem_ptr);
 }
 #endif /* PNG_USER_MEM_SUPPORTED */
+#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */

pngpread.c

@@ -1,9 +1,9 @@
 
 /* pngpread.c - read a png file in push mode
  *
- * libpng version 1.2.8beta1 - November 1, 2004
+ * Last changed in libpng 1.2.27 [April 29, 2008]
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2004 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2008 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  */
@@ -28,6 +28,7 @@ void PNGAPI
 png_process_data(png_structp png_ptr, png_infop info_ptr,
    png_bytep buffer, png_size_t buffer_size)
 {
+   if(png_ptr == NULL || info_ptr == NULL) return;
    png_push_restore_buffer(png_ptr, buffer, buffer_size);
 
    while (png_ptr->buffer_size)
@@ -42,6 +43,7 @@ png_process_data(png_structp png_ptr, png_infop info_ptr,
 void /* PRIVATE */
 png_process_some_data(png_structp png_ptr, png_infop info_ptr)
 {
+   if(png_ptr == NULL) return;
    switch (png_ptr->process_mode)
    {
       case PNG_READ_SIG_MODE:
@@ -135,60 +137,60 @@ void /* PRIVATE */
 png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
 {
 #ifdef PNG_USE_LOCAL_ARRAYS
-      PNG_IHDR;
-      PNG_IDAT;
-      PNG_IEND;
-      PNG_PLTE;
+      PNG_CONST PNG_IHDR;
+      PNG_CONST PNG_IDAT;
+      PNG_CONST PNG_IEND;
+      PNG_CONST PNG_PLTE;
 #if defined(PNG_READ_bKGD_SUPPORTED)
-      PNG_bKGD;
+      PNG_CONST PNG_bKGD;
 #endif
 #if defined(PNG_READ_cHRM_SUPPORTED)
-      PNG_cHRM;
+      PNG_CONST PNG_cHRM;
 #endif
 #if defined(PNG_READ_gAMA_SUPPORTED)
-      PNG_gAMA;
+      PNG_CONST PNG_gAMA;
 #endif
 #if defined(PNG_READ_hIST_SUPPORTED)
-      PNG_hIST;
+      PNG_CONST PNG_hIST;
 #endif
 #if defined(PNG_READ_iCCP_SUPPORTED)
-      PNG_iCCP;
+      PNG_CONST PNG_iCCP;
 #endif
 #if defined(PNG_READ_iTXt_SUPPORTED)
-      PNG_iTXt;
+      PNG_CONST PNG_iTXt;
 #endif
 #if defined(PNG_READ_oFFs_SUPPORTED)
-      PNG_oFFs;
+      PNG_CONST PNG_oFFs;
 #endif
 #if defined(PNG_READ_pCAL_SUPPORTED)
-      PNG_pCAL;
+      PNG_CONST PNG_pCAL;
 #endif
 #if defined(PNG_READ_pHYs_SUPPORTED)
-      PNG_pHYs;
+      PNG_CONST PNG_pHYs;
 #endif
 #if defined(PNG_READ_sBIT_SUPPORTED)
-      PNG_sBIT;
+      PNG_CONST PNG_sBIT;
 #endif
 #if defined(PNG_READ_sCAL_SUPPORTED)
-      PNG_sCAL;
+      PNG_CONST PNG_sCAL;
 #endif
 #if defined(PNG_READ_sRGB_SUPPORTED)
-      PNG_sRGB;
+      PNG_CONST PNG_sRGB;
 #endif
 #if defined(PNG_READ_sPLT_SUPPORTED)
-      PNG_sPLT;
+      PNG_CONST PNG_sPLT;
 #endif
 #if defined(PNG_READ_tEXt_SUPPORTED)
-      PNG_tEXt;
+      PNG_CONST PNG_tEXt;
 #endif
 #if defined(PNG_READ_tIME_SUPPORTED)
-      PNG_tIME;
+      PNG_CONST PNG_tIME;
 #endif
 #if defined(PNG_READ_tRNS_SUPPORTED)
-      PNG_tRNS;
+      PNG_CONST PNG_tRNS;
 #endif
 #if defined(PNG_READ_zTXt_SUPPORTED)
-      PNG_zTXt;
+      PNG_CONST PNG_zTXt;
 #endif
 #endif /* PNG_USE_LOCAL_ARRAYS */
    /* First we make sure we have enough data for the 4 byte chunk name
@@ -214,10 +216,16 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
       png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
    }
 
+   if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+     if(png_ptr->mode & PNG_AFTER_IDAT)
+        png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT;
+
    if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
    {
       if (png_ptr->push_length + 4 > png_ptr->buffer_size)
       {
+         if (png_ptr->push_length != 13)
+            png_error(png_ptr, "Invalid IHDR length");
          png_push_save_buffer(png_ptr);
          return;
       }
@@ -267,7 +275,7 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
       }
       png_handle_PLTE(png_ptr, info_ptr, png_ptr->push_length);
    }
-   else if (!png_memcmp(png_ptr->chunk_name, (png_bytep)png_IDAT, 4))
+   else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
    {
       /* If we reach an IDAT chunk, this means we have read all of the
        * header chunks, and we can start reading the image (or if this
@@ -281,8 +289,9 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
 
       if (png_ptr->mode & PNG_HAVE_IDAT)
       {
-         if (png_ptr->push_length == 0)
-            return;
+         if (!(png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
+           if (png_ptr->push_length == 0)
+              return;
 
          if (png_ptr->mode & PNG_AFTER_IDAT)
             png_error(png_ptr, "Too many IDAT's found");
@@ -556,6 +565,7 @@ png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length)
 {
    png_bytep ptr;
 
+   if(png_ptr == NULL) return;
    ptr = buffer;
    if (png_ptr->save_buffer_size)
    {
@@ -614,7 +624,7 @@ png_push_save_buffer(png_structp png_ptr)
       png_size_t new_max;
       png_bytep old_buffer;
 
-      if (png_ptr->save_buffer_size > PNG_SIZE_MAX - 
+      if (png_ptr->save_buffer_size > PNG_SIZE_MAX -
          (png_ptr->current_buffer_size + 256))
       {
         png_error(png_ptr, "Potential overflow of save_buffer");
@@ -652,7 +662,7 @@ void /* PRIVATE */
 png_push_read_IDAT(png_structp png_ptr)
 {
 #ifdef PNG_USE_LOCAL_ARRAYS
-   PNG_IDAT;
+   PNG_CONST PNG_IDAT;
 #endif
    if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER))
    {
@@ -670,7 +680,7 @@ png_push_read_IDAT(png_structp png_ptr)
       png_crc_read(png_ptr, png_ptr->chunk_name, 4);
       png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
 
-      if (png_memcmp(png_ptr->chunk_name, (png_bytep)png_IDAT, 4))
+      if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
       {
          png_ptr->process_mode = PNG_READ_CHUNK_MODE;
          if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
@@ -815,7 +825,7 @@ png_push_process_row(png_structp png_ptr)
    png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
       png_ptr->rowbytes + 1);
 
-   if (png_ptr->transformations)
+   if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA))
       png_do_read_transformations(png_ptr);
 
 #if defined(PNG_READ_INTERLACING_SUPPORTED)
@@ -982,25 +992,20 @@ png_read_push_finish_row(png_structp png_ptr)
    /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
 
    /* start of interlace block */
-   const int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
+   PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
 
    /* offset to next interlace block */
-   const int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
+   PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
 
    /* start of interlace block in the y direction */
-   const int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
+   PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
 
    /* offset to next interlace block in the y direction */
-   const int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
-
-   /* Width of interlace block.  This is not currently used - if you need
-    * it, uncomment it here and in png.h
-   const int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
-   */
+   PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
 
    /* Height of interlace block.  This is not currently used - if you need
     * it, uncomment it here and in png.h
-   const int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
+   PNG_CONST int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
    */
 #endif
 
@@ -1015,32 +1020,37 @@ png_read_push_finish_row(png_structp png_ptr)
          png_ptr->rowbytes + 1);
       do
       {
-         png_ptr->pass++;
-         if ((png_ptr->pass == 1 && png_ptr->width < 5) ||
-             (png_ptr->pass == 3 && png_ptr->width < 3) ||
-             (png_ptr->pass == 5 && png_ptr->width < 2))
-           png_ptr->pass++;
+         int pass;
+         pass = png_ptr->pass;
+         pass++;
+         if ((pass == 1 && png_ptr->width < 5) ||
+             (pass == 3 && png_ptr->width < 3) ||
+             (pass == 5 && png_ptr->width < 2))
+           pass++;
 
-         if (png_ptr->pass > 7)
-            png_ptr->pass--;
-         if (png_ptr->pass >= 7)
-            break;
+         if (pass > 7)
+            pass--;
+         png_ptr->pass = (png_byte) pass;
+         if (pass < 7)
+           {
+             png_ptr->iwidth = (png_ptr->width +
+                png_pass_inc[pass] - 1 -
+                png_pass_start[pass]) /
+                png_pass_inc[pass];
 
-         png_ptr->iwidth = (png_ptr->width +
-            png_pass_inc[png_ptr->pass] - 1 -
-            png_pass_start[png_ptr->pass]) /
-            png_pass_inc[png_ptr->pass];
+             png_ptr->irowbytes = PNG_ROWBYTES(png_ptr->pixel_depth,
+                png_ptr->iwidth) + 1;
 
-         png_ptr->irowbytes = PNG_ROWBYTES(png_ptr->pixel_depth,
-            png_ptr->iwidth) + 1;
+             if (png_ptr->transformations & PNG_INTERLACE)
+                break;
 
-         if (png_ptr->transformations & PNG_INTERLACE)
-            break;
-
-         png_ptr->num_rows = (png_ptr->height +
-            png_pass_yinc[png_ptr->pass] - 1 -
-            png_pass_ystart[png_ptr->pass]) /
-            png_pass_yinc[png_ptr->pass];
+             png_ptr->num_rows = (png_ptr->height +
+                png_pass_yinc[pass] - 1 -
+                png_pass_ystart[pass]) /
+                png_pass_yinc[pass];
+           }
+         else
+           break;
 
       } while (png_ptr->iwidth == 0 || png_ptr->num_rows == 0);
    }
@@ -1054,8 +1064,7 @@ png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
    if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
       {
          png_error(png_ptr, "Out of place tEXt");
-         /* to quiet some compiler warnings */
-         if(info_ptr == NULL) return;
+         info_ptr = info_ptr; /* to quiet some compiler warnings */
       }
 
 #ifdef PNG_MAX_MALLOC_64K
@@ -1118,7 +1127,7 @@ png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)
       for (text = key; *text; text++)
          /* empty loop */ ;
 
-      if (text != key + png_ptr->current_text_size)
+      if (text < key + png_ptr->current_text_size)
          text++;
 
       text_ptr = (png_textp)png_malloc(png_ptr,
@@ -1151,8 +1160,7 @@ png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
    if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
       {
          png_error(png_ptr, "Out of place zTXt");
-         /* to quiet some compiler warnings */
-         if(info_ptr == NULL) return;
+         info_ptr = info_ptr; /* to quiet some compiler warnings */
       }
 
 #ifdef PNG_MAX_MALLOC_64K
@@ -1214,7 +1222,7 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
          /* empty loop */ ;
 
       /* zTXt can't have zero text */
-      if (text == key + png_ptr->current_text_size)
+      if (text >= key + png_ptr->current_text_size)
       {
          png_ptr->current_text = NULL;
          png_free(png_ptr, key);
@@ -1344,8 +1352,7 @@ png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
    if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
       {
          png_error(png_ptr, "Out of place iTXt");
-         /* to quiet some compiler warnings */
-         if(info_ptr == NULL) return;
+         info_ptr = info_ptr; /* to quiet some compiler warnings */
       }
 
 #ifdef PNG_MAX_MALLOC_64K
@@ -1412,7 +1419,7 @@ png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
       for (lang = key; *lang; lang++)
          /* empty loop */ ;
 
-      if (lang != key + png_ptr->current_text_size)
+      if (lang < key + png_ptr->current_text_size - 3)
          lang++;
 
       comp_flag = *lang++;
@@ -1422,10 +1429,14 @@ png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
          /* empty loop */ ;
       lang_key++;        /* skip NUL separator */
 
-      for (text = lang_key; *text; text++)
-         /* empty loop */ ;
+      text=lang_key;
+      if (lang_key < key + png_ptr->current_text_size - 1)
+      {
+        for (; *text; text++)
+           /* empty loop */ ;
+      }
 
-      if (text != key + png_ptr->current_text_size)
+      if (text < key + png_ptr->current_text_size)
          text++;
 
       text_ptr = (png_textp)png_malloc(png_ptr,
@@ -1463,55 +1474,66 @@ png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32
    if (!(png_ptr->chunk_name[0] & 0x20))
    {
 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
-      if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
-           PNG_HANDLE_CHUNK_ALWAYS
+     if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
+          PNG_HANDLE_CHUNK_ALWAYS
 #if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
-           && png_ptr->read_user_chunk_fn == NULL
+          && png_ptr->read_user_chunk_fn == NULL
 #endif
-         )
+        )
 #endif
-         png_chunk_error(png_ptr, "unknown critical chunk");
+        png_chunk_error(png_ptr, "unknown critical chunk");
 
-      /* to quiet compiler warnings about unused info_ptr */
-      if (info_ptr == NULL)
-         return;
+     info_ptr = info_ptr; /* to quiet some compiler warnings */
    }
 
 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
    if (png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS)
    {
-       png_unknown_chunk chunk;
-
 #ifdef PNG_MAX_MALLOC_64K
-       if (length > (png_uint_32)65535L)
-       {
-           png_warning(png_ptr, "unknown chunk too large to fit in memory");
-           skip = length - (png_uint_32)65535L;
-           length = (png_uint_32)65535L;
-       }
+      if (length > (png_uint_32)65535L)
+      {
+          png_warning(png_ptr, "unknown chunk too large to fit in memory");
+          skip = length - (png_uint_32)65535L;
+          length = (png_uint_32)65535L;
+      }
 #endif
+      png_memcpy((png_charp)png_ptr->unknown_chunk.name,
+                 (png_charp)png_ptr->chunk_name, 
+                 png_sizeof(png_ptr->unknown_chunk.name));
+      png_ptr->unknown_chunk.name[png_sizeof(png_ptr->unknown_chunk.name)-1]='\0';
 
-       png_strcpy((png_charp)chunk.name, (png_charp)png_ptr->chunk_name);
-       chunk.data = (png_bytep)png_malloc(png_ptr, length);
-       png_crc_read(png_ptr, chunk.data, length);
-       chunk.size = length;
+      png_ptr->unknown_chunk.size = (png_size_t)length;
+      if (length == 0)
+         png_ptr->unknown_chunk.data = NULL;
+      else
+      {
+         png_ptr->unknown_chunk.data = (png_bytep)png_malloc(png_ptr, length);
+         png_crc_read(png_ptr, (png_bytep)png_ptr->unknown_chunk.data, length);
+      }
 #if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
-       if(png_ptr->read_user_chunk_fn != NULL)
-       {
-          /* callback to user unknown chunk handler */
-          if ((*(png_ptr->read_user_chunk_fn)) (png_ptr, &chunk) <= 0)
-          {
-             if (!(png_ptr->chunk_name[0] & 0x20))
-                if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
-                     PNG_HANDLE_CHUNK_ALWAYS)
-                   png_chunk_error(png_ptr, "unknown critical chunk");
-          }
-             png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1);
-       }
-       else
+      if(png_ptr->read_user_chunk_fn != NULL)
+      {
+         /* callback to user unknown chunk handler */
+         int ret;
+         ret = (*(png_ptr->read_user_chunk_fn))
+           (png_ptr, &png_ptr->unknown_chunk);
+         if (ret < 0)
+            png_chunk_error(png_ptr, "error in user chunk");
+         if (ret == 0)
+         {
+            if (!(png_ptr->chunk_name[0] & 0x20))
+               if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
+                    PNG_HANDLE_CHUNK_ALWAYS)
+                  png_chunk_error(png_ptr, "unknown critical chunk");
+            png_set_unknown_chunks(png_ptr, info_ptr,
+               &png_ptr->unknown_chunk, 1);
+         }
+      }
+      else
 #endif
-          png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1);
-       png_free(png_ptr, chunk.data);
+        png_set_unknown_chunks(png_ptr, info_ptr, &png_ptr->unknown_chunk, 1);
+      png_free(png_ptr, png_ptr->unknown_chunk.data);
+      png_ptr->unknown_chunk.data = NULL;
    }
    else
 #endif
@@ -1546,9 +1568,10 @@ png_progressive_combine_row (png_structp png_ptr,
    png_bytep old_row, png_bytep new_row)
 {
 #ifdef PNG_USE_LOCAL_ARRAYS
-   const int FARDATA png_pass_dsp_mask[7] =
+   PNG_CONST int FARDATA png_pass_dsp_mask[7] =
       {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
 #endif
+   if(png_ptr == NULL) return;
    if (new_row != NULL)    /* new_row must == png_ptr->row_buf here. */
       png_combine_row(png_ptr, old_row, png_pass_dsp_mask[png_ptr->pass]);
 }
@@ -1558,6 +1581,7 @@ png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr,
    png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
    png_progressive_end_ptr end_fn)
 {
+   if(png_ptr == NULL) return;
    png_ptr->info_fn = info_fn;
    png_ptr->row_fn = row_fn;
    png_ptr->end_fn = end_fn;
@@ -1568,6 +1592,7 @@ png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr,
 png_voidp PNGAPI
 png_get_progressive_ptr(png_structp png_ptr)
 {
+   if(png_ptr == NULL) return (NULL);
    return png_ptr->io_ptr;
 }
 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */

pngread.c

@@ -1,9 +1,9 @@
 
 /* pngread.c - read a PNG file
  *
- * libpng 1.2.8beta1 - November 1, 2004
+ * Last changed in libpng 1.2.25 [February 18, 2008]
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2004 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2008 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
@@ -14,6 +14,8 @@
 #define PNG_INTERNAL
 #include "png.h"
 
+#if defined(PNG_READ_SUPPORTED)
+
 /* Create a PNG structure for reading, and allocate any memory needed. */
 png_structp PNGAPI
 png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr,
@@ -53,12 +55,6 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
    if (png_ptr == NULL)
       return (NULL);
 
-#if !defined(PNG_1_0_X)
-#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
-   png_init_mmx_flags(png_ptr);   /* 1.2.0 addition */
-#endif
-#endif /* PNG_1_0_X */
-
    /* added at libpng-1.2.6 */
 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
    png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
@@ -75,7 +71,7 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
       png_free(png_ptr, png_ptr->zbuf);
       png_ptr->zbuf=NULL;
 #ifdef PNG_USER_MEM_SUPPORTED
-      png_destroy_struct_2((png_voidp)png_ptr, 
+      png_destroy_struct_2((png_voidp)png_ptr,
          (png_free_ptr)free_fn, (png_voidp)mem_ptr);
 #else
       png_destroy_struct((png_voidp)png_ptr);
@@ -93,12 +89,18 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
 
    png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
 
-   i=0;
-   do
+   if(user_png_ver)
    {
-     if(user_png_ver[i] != png_libpng_ver[i])
+     i=0;
+     do
+     {
+       if(user_png_ver[i] != png_libpng_ver[i])
+          png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+     } while (png_libpng_ver[i++]);
+   }
+   else
         png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
-   } while (png_libpng_ver[i++]);
+   
 
    if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
    {
@@ -115,11 +117,13 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
         char msg[80];
         if (user_png_ver)
         {
-          sprintf(msg, "Application was compiled with png.h from libpng-%.20s",
+          png_snprintf(msg, 80,
+             "Application was compiled with png.h from libpng-%.20s",
              user_png_ver);
           png_warning(png_ptr, msg);
         }
-        sprintf(msg, "Application  is  running with png.c from libpng-%.20s",
+        png_snprintf(msg, 80,
+             "Application  is  running with png.c from libpng-%.20s",
            png_libpng_ver);
         png_warning(png_ptr, msg);
 #endif
@@ -169,10 +173,10 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
    return (png_ptr);
 }
 
+#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
 /* Initialize PNG structure for reading, and allocate any memory needed.
    This interface is deprecated in favour of the png_create_read_struct(),
-   and it will eventually disappear. */
-#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
+   and it will disappear as of libpng-1.3.0. */
 #undef png_read_init
 void PNGAPI
 png_read_init(png_structp png_ptr)
@@ -180,26 +184,28 @@ png_read_init(png_structp png_ptr)
    /* We only come here via pre-1.0.7-compiled applications */
    png_read_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
 }
-#endif
 
 void PNGAPI
 png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver,
    png_size_t png_struct_size, png_size_t png_info_size)
 {
    /* We only come here via pre-1.0.12-compiled applications */
+   if(png_ptr == NULL) return;
 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
-   if(png_sizeof(png_struct) > png_struct_size || 
+   if(png_sizeof(png_struct) > png_struct_size ||
       png_sizeof(png_info) > png_info_size)
    {
       char msg[80];
       png_ptr->warning_fn=NULL;
       if (user_png_ver)
       {
-        sprintf(msg, "Application was compiled with png.h from libpng-%.20s",
+        png_snprintf(msg, 80,
+           "Application was compiled with png.h from libpng-%.20s",
            user_png_ver);
         png_warning(png_ptr, msg);
       }
-      sprintf(msg, "Application  is  running with png.c from libpng-%.20s",
+      png_snprintf(msg, 80,
+         "Application  is  running with png.c from libpng-%.20s",
          png_libpng_ver);
       png_warning(png_ptr, msg);
    }
@@ -224,6 +230,7 @@ png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver,
      }
    png_read_init_3(&png_ptr, user_png_ver, png_struct_size);
 }
+#endif /* PNG_1_0_X || PNG_1_2_X */
 
 void PNGAPI
 png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
@@ -237,6 +244,8 @@ png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
 
    png_structp png_ptr=*ptr_ptr;
 
+   if(png_ptr == NULL) return;
+
    do
    {
      if(user_png_ver[i] != png_libpng_ver[i])
@@ -315,6 +324,7 @@ png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
 void PNGAPI
 png_read_info(png_structp png_ptr, png_infop info_ptr)
 {
+   if(png_ptr == NULL || info_ptr == NULL) return;
    png_debug(1, "in png_read_info\n");
    /* If we haven't checked all of the PNG signature bytes, do so now. */
    if (png_ptr->sig_bytes < 8)
@@ -340,60 +350,60 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
    for(;;)
    {
 #ifdef PNG_USE_LOCAL_ARRAYS
-      PNG_IHDR;
-      PNG_IDAT;
-      PNG_IEND;
-      PNG_PLTE;
+      PNG_CONST PNG_IHDR;
+      PNG_CONST PNG_IDAT;
+      PNG_CONST PNG_IEND;
+      PNG_CONST PNG_PLTE;
 #if defined(PNG_READ_bKGD_SUPPORTED)
-      PNG_bKGD;
+      PNG_CONST PNG_bKGD;
 #endif
 #if defined(PNG_READ_cHRM_SUPPORTED)
-      PNG_cHRM;
+      PNG_CONST PNG_cHRM;
 #endif
 #if defined(PNG_READ_gAMA_SUPPORTED)
-      PNG_gAMA;
+      PNG_CONST PNG_gAMA;
 #endif
 #if defined(PNG_READ_hIST_SUPPORTED)
-      PNG_hIST;
+      PNG_CONST PNG_hIST;
 #endif
 #if defined(PNG_READ_iCCP_SUPPORTED)
-      PNG_iCCP;
+      PNG_CONST PNG_iCCP;
 #endif
 #if defined(PNG_READ_iTXt_SUPPORTED)
-      PNG_iTXt;
+      PNG_CONST PNG_iTXt;
 #endif
 #if defined(PNG_READ_oFFs_SUPPORTED)
-      PNG_oFFs;
+      PNG_CONST PNG_oFFs;
 #endif
 #if defined(PNG_READ_pCAL_SUPPORTED)
-      PNG_pCAL;
+      PNG_CONST PNG_pCAL;
 #endif
 #if defined(PNG_READ_pHYs_SUPPORTED)
-      PNG_pHYs;
+      PNG_CONST PNG_pHYs;
 #endif
 #if defined(PNG_READ_sBIT_SUPPORTED)
-      PNG_sBIT;
+      PNG_CONST PNG_sBIT;
 #endif
 #if defined(PNG_READ_sCAL_SUPPORTED)
-      PNG_sCAL;
+      PNG_CONST PNG_sCAL;
 #endif
 #if defined(PNG_READ_sPLT_SUPPORTED)
-      PNG_sPLT;
+      PNG_CONST PNG_sPLT;
 #endif
 #if defined(PNG_READ_sRGB_SUPPORTED)
-      PNG_sRGB;
+      PNG_CONST PNG_sRGB;
 #endif
 #if defined(PNG_READ_tEXt_SUPPORTED)
-      PNG_tEXt;
+      PNG_CONST PNG_tEXt;
 #endif
 #if defined(PNG_READ_tIME_SUPPORTED)
-      PNG_tIME;
+      PNG_CONST PNG_tIME;
 #endif
 #if defined(PNG_READ_tRNS_SUPPORTED)
-      PNG_tRNS;
+      PNG_CONST PNG_tRNS;
 #endif
 #if defined(PNG_READ_zTXt_SUPPORTED)
-      PNG_zTXt;
+      PNG_CONST PNG_zTXt;
 #endif
 #endif /* PNG_USE_LOCAL_ARRAYS */
       png_byte chunk_length[4];
@@ -411,6 +421,10 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
       /* This should be a binary subdivision search or a hash for
        * matching the chunk name rather than a linear search.
        */
+      if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+        if(png_ptr->mode & PNG_AFTER_IDAT)
+          png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT;
+
       if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
          png_handle_IHDR(png_ptr, info_ptr, length);
       else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
@@ -527,6 +541,7 @@ void PNGAPI
 png_read_update_info(png_structp png_ptr, png_infop info_ptr)
 {
    png_debug(1, "in png_read_update_info\n");
+   if(png_ptr == NULL) return;
    if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
       png_read_start_row(png_ptr);
    else
@@ -545,6 +560,7 @@ void PNGAPI
 png_start_read_image(png_structp png_ptr)
 {
    png_debug(1, "in png_start_read_image\n");
+   if(png_ptr == NULL) return;
    if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
       png_read_start_row(png_ptr);
 }
@@ -555,11 +571,13 @@ void PNGAPI
 png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
 {
 #ifdef PNG_USE_LOCAL_ARRAYS
-   PNG_IDAT;
-   const int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
-   const int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
+   PNG_CONST PNG_IDAT;
+   PNG_CONST int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
+     0xff};
+   PNG_CONST int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
 #endif
    int ret;
+   if(png_ptr == NULL) return;
    png_debug2(1, "in png_read_row (row %lu, pass %d)\n",
       png_ptr->row_number, png_ptr->pass);
    if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
@@ -736,7 +754,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
 
    png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
       png_ptr->rowbytes + 1);
-   
+
 #if defined(PNG_MNG_FEATURES_SUPPORTED)
    if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
       (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
@@ -746,7 +764,8 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
    }
 #endif
 
-   if (png_ptr->transformations)
+
+   if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA))
       png_do_read_transformations(png_ptr);
 
 #if defined(PNG_READ_INTERLACING_SUPPORTED)
@@ -805,7 +824,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
  * not called png_set_interlace_handling(), the display_row buffer will
  * be ignored, so pass NULL to it.
  *
- * [*] png_handle_alpha() does not exist yet, as of libpng version 1.2.8beta1
+ * [*] png_handle_alpha() does not exist yet, as of this version of libpng
  */
 
 void PNGAPI
@@ -817,6 +836,7 @@ png_read_rows(png_structp png_ptr, png_bytepp row,
    png_bytepp dp;
 
    png_debug(1, "in png_read_rows\n");
+   if(png_ptr == NULL) return;
    rp = row;
    dp = display_row;
    if (rp != NULL && dp != NULL)
@@ -855,7 +875,7 @@ png_read_rows(png_structp png_ptr, png_bytepp row,
  * only call this function once.  If you desire to have an image for
  * each pass of a interlaced image, use png_read_rows() instead.
  *
- * [*] png_handle_alpha() does not exist yet, as of libpng version 1.2.8beta1
+ * [*] png_handle_alpha() does not exist yet, as of this version of libpng
  */
 void PNGAPI
 png_read_image(png_structp png_ptr, png_bytepp image)
@@ -865,6 +885,7 @@ png_read_image(png_structp png_ptr, png_bytepp image)
    png_bytepp rp;
 
    png_debug(1, "in png_read_image\n");
+   if(png_ptr == NULL) return;
 
 #ifdef PNG_READ_INTERLACING_SUPPORTED
    pass = png_set_interlace_handling(png_ptr);
@@ -903,65 +924,66 @@ png_read_end(png_structp png_ptr, png_infop info_ptr)
    png_uint_32 length;
 
    png_debug(1, "in png_read_end\n");
+   if(png_ptr == NULL) return;
    png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */
 
    do
    {
 #ifdef PNG_USE_LOCAL_ARRAYS
-      PNG_IHDR;
-      PNG_IDAT;
-      PNG_IEND;
-      PNG_PLTE;
+      PNG_CONST PNG_IHDR;
+      PNG_CONST PNG_IDAT;
+      PNG_CONST PNG_IEND;
+      PNG_CONST PNG_PLTE;
 #if defined(PNG_READ_bKGD_SUPPORTED)
-      PNG_bKGD;
+      PNG_CONST PNG_bKGD;
 #endif
 #if defined(PNG_READ_cHRM_SUPPORTED)
-      PNG_cHRM;
+      PNG_CONST PNG_cHRM;
 #endif
 #if defined(PNG_READ_gAMA_SUPPORTED)
-      PNG_gAMA;
+      PNG_CONST PNG_gAMA;
 #endif
 #if defined(PNG_READ_hIST_SUPPORTED)
-      PNG_hIST;
+      PNG_CONST PNG_hIST;
 #endif
 #if defined(PNG_READ_iCCP_SUPPORTED)
-      PNG_iCCP;
+      PNG_CONST PNG_iCCP;
 #endif
 #if defined(PNG_READ_iTXt_SUPPORTED)
-      PNG_iTXt;
+      PNG_CONST PNG_iTXt;
 #endif
 #if defined(PNG_READ_oFFs_SUPPORTED)
-      PNG_oFFs;
+      PNG_CONST PNG_oFFs;
 #endif
 #if defined(PNG_READ_pCAL_SUPPORTED)
-      PNG_pCAL;
+      PNG_CONST PNG_pCAL;
 #endif
 #if defined(PNG_READ_pHYs_SUPPORTED)
-      PNG_pHYs;
+      PNG_CONST PNG_pHYs;
 #endif
 #if defined(PNG_READ_sBIT_SUPPORTED)
-      PNG_sBIT;
+      PNG_CONST PNG_sBIT;
 #endif
 #if defined(PNG_READ_sCAL_SUPPORTED)
-      PNG_sCAL;
+      PNG_CONST PNG_sCAL;
 #endif
 #if defined(PNG_READ_sPLT_SUPPORTED)
-      PNG_sPLT;
+      PNG_CONST PNG_sPLT;
 #endif
 #if defined(PNG_READ_sRGB_SUPPORTED)
-      PNG_sRGB;
+      PNG_CONST PNG_sRGB;
 #endif
 #if defined(PNG_READ_tEXt_SUPPORTED)
-      PNG_tEXt;
+      PNG_CONST PNG_tEXt;
 #endif
 #if defined(PNG_READ_tIME_SUPPORTED)
-      PNG_tIME;
+      PNG_CONST PNG_tIME;
 #endif
 #if defined(PNG_READ_tRNS_SUPPORTED)
-      PNG_tRNS;
+      PNG_CONST PNG_tRNS;
 #endif
 #if defined(PNG_READ_zTXt_SUPPORTED)
-      PNG_zTXt;
+      PNG_CONST PNG_zTXt;
 #endif
 #endif /* PNG_USE_LOCAL_ARRAYS */
 
@@ -982,11 +1004,9 @@ png_read_end(png_structp png_ptr, png_infop info_ptr)
       {
          if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
          {
-            if (length > 0 || png_ptr->mode & PNG_AFTER_IDAT)
+            if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
                png_error(png_ptr, "Too many IDAT's found");
          }
-         else
-            png_ptr->mode |= PNG_AFTER_IDAT;
          png_handle_unknown(png_ptr, info_ptr, length);
          if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
             png_ptr->mode |= PNG_HAVE_PLTE;
@@ -997,7 +1017,7 @@ png_read_end(png_structp png_ptr, png_infop info_ptr)
          /* Zero length IDATs are legal after the last IDAT has been
           * read, but not after other chunks have been read.
           */
-         if (length > 0 || png_ptr->mode & PNG_AFTER_IDAT)
+         if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
             png_error(png_ptr, "Too many IDAT's found");
          png_crc_finish(png_ptr, length);
       }
@@ -1085,13 +1105,22 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
    png_structp png_ptr = NULL;
    png_infop info_ptr = NULL, end_info_ptr = NULL;
 #ifdef PNG_USER_MEM_SUPPORTED
-   png_free_ptr free_fn;
-   png_voidp mem_ptr;
+   png_free_ptr free_fn = NULL;
+   png_voidp mem_ptr = NULL;
 #endif
 
    png_debug(1, "in png_destroy_read_struct\n");
    if (png_ptr_ptr != NULL)
+   {
       png_ptr = *png_ptr_ptr;
+   }
+   if (png_ptr == NULL)
+      return;
+
+#ifdef PNG_USER_MEM_SUPPORTED
+   free_fn = png_ptr->free_fn;
+   mem_ptr = png_ptr->mem_ptr;
+#endif
 
    if (info_ptr_ptr != NULL)
       info_ptr = *info_ptr_ptr;
@@ -1099,11 +1128,6 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
    if (end_info_ptr_ptr != NULL)
       end_info_ptr = *end_info_ptr_ptr;
 
-#ifdef PNG_USER_MEM_SUPPORTED
-   free_fn = png_ptr->free_fn;
-   mem_ptr = png_ptr->mem_ptr;
-#endif
-
    png_read_destroy(png_ptr, info_ptr, end_info_ptr);
 
    if (info_ptr != NULL)
@@ -1135,16 +1159,13 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
       *end_info_ptr_ptr = NULL;
    }
 
-   if (png_ptr != NULL)
-   {
 #ifdef PNG_USER_MEM_SUPPORTED
-      png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
-          (png_voidp)mem_ptr);
+   png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
+       (png_voidp)mem_ptr);
 #else
-      png_destroy_struct((png_voidp)png_ptr);
+   png_destroy_struct((png_voidp)png_ptr);
 #endif
-      *png_ptr_ptr = NULL;
-   }
+   *png_ptr_ptr = NULL;
 }
 
 /* free all memory used by the read (old method) */
@@ -1295,6 +1316,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
 void PNGAPI
 png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn)
 {
+   if(png_ptr == NULL) return;
    png_ptr->read_row_fn = read_row_fn;
 }
 
@@ -1308,6 +1330,7 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
 {
    int row;
 
+   if(png_ptr == NULL) return;
 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
    /* invert the alpha channel from opacity to transparency
     */
@@ -1447,9 +1470,10 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
    /* read rest of file, and get additional chunks in info_ptr - REQUIRED */
    png_read_end(png_ptr, info_ptr);
 
-   if(transforms == 0 || params == NULL)
-      /* quiet compiler warnings */ return;
+   transforms = transforms; /* quiet compiler warnings */
+   params = params;
 
 }
-#endif
+#endif /* PNG_INFO_IMAGE_SUPPORTED */
 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
+#endif /* PNG_READ_SUPPORTED */

pngrio.c

@@ -1,9 +1,9 @@
 
 /* pngrio.c - functions for data input
  *
- * libpng 1.2.8beta1 - November 1, 2004
+ * Last changed in libpng 1.2.13 November 13, 2006
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2004 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2006 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
@@ -18,6 +18,8 @@
 #define PNG_INTERNAL
 #include "png.h"
 
+#if defined(PNG_READ_SUPPORTED)
+
 /* Read the data from whatever input you are using.  The default routine
    reads from a file pointer.  Note that this routine sometimes gets called
    with very small lengths, so you should implement some kind of simple
@@ -44,6 +46,7 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    png_size_t check;
 
+   if(png_ptr == NULL) return;
    /* fread() returns 0 on error, so it is OK to store this in a png_size_t
     * instead of an int, which is what fread() actually returns.
     */
@@ -67,13 +70,14 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 #define NEAR_BUF_SIZE 1024
 #define MIN(a,b) (a <= b ? a : b)
 
-static void /* PRIVATE */
+static void PNGAPI
 png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    int check;
    png_byte *n_data;
    png_FILE_p io_ptr;
 
+   if(png_ptr == NULL) return;
    /* Check if data really is near. If so, use usual code. */
    n_data = (png_byte *)CVT_PTR_NOCHECK(data);
    io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
@@ -134,6 +138,7 @@ void PNGAPI
 png_set_read_fn(png_structp png_ptr, png_voidp io_ptr,
    png_rw_ptr read_data_fn)
 {
+   if(png_ptr == NULL) return;
    png_ptr->io_ptr = io_ptr;
 
 #if !defined(PNG_NO_STDIO)
@@ -159,3 +164,4 @@ png_set_read_fn(png_structp png_ptr, png_voidp io_ptr,
    png_ptr->output_flush_fn = NULL;
 #endif
 }
+#endif /* PNG_READ_SUPPORTED */

pngrtran.c

@@ -1,9 +1,9 @@
 
 /* pngrtran.c - transforms the data in a row for PNG readers
  *
- * libpng version  1.2.8beta1 - November 1, 2004
+ * Last changed in libpng 1.2.27 [April 29, 2008]
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2004 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2008 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
@@ -16,12 +16,15 @@
 #define PNG_INTERNAL
 #include "png.h"
 
+#if defined(PNG_READ_SUPPORTED)
+
 /* Set the action on getting a CRC error for an ancillary or critical chunk. */
 void PNGAPI
 png_set_crc_action(png_structp png_ptr, int crit_action, int ancil_action)
 {
    png_debug(1, "in png_set_crc_action\n");
    /* Tell libpng how we react to CRC errors in critical chunks */
+   if(png_ptr == NULL) return;
    switch (crit_action)
    {
       case PNG_CRC_NO_CHANGE:                        /* leave setting as is */
@@ -78,6 +81,7 @@ png_set_background(png_structp png_ptr,
    int need_expand, double background_gamma)
 {
    png_debug(1, "in png_set_background\n");
+   if(png_ptr == NULL) return;
    if (background_gamma_code == PNG_BACKGROUND_GAMMA_UNKNOWN)
    {
       png_warning(png_ptr, "Application must supply a known background gamma");
@@ -90,17 +94,6 @@ png_set_background(png_structp png_ptr,
    png_ptr->background_gamma = (float)background_gamma;
    png_ptr->background_gamma_type = (png_byte)(background_gamma_code);
    png_ptr->transformations |= (need_expand ? PNG_BACKGROUND_EXPAND : 0);
-
-   /* Note:  if need_expand is set and color_type is either RGB or RGB_ALPHA
-    * (in which case need_expand is superfluous anyway), the background color
-    * might actually be gray yet not be flagged as such. This is not a problem
-    * for the current code, which uses PNG_BACKGROUND_IS_GRAY only to
-    * decide when to do the png_do_gray_to_rgb() transformation.
-    */
-   if ((need_expand && !(png_ptr->color_type & PNG_COLOR_MASK_COLOR)) ||
-       (!need_expand && background_color->red == background_color->green &&
-        background_color->red == background_color->blue))
-      png_ptr->mode |= PNG_BACKGROUND_IS_GRAY;
 }
 #endif
 
@@ -110,6 +103,7 @@ void PNGAPI
 png_set_strip_16(png_structp png_ptr)
 {
    png_debug(1, "in png_set_strip_16\n");
+   if(png_ptr == NULL) return;
    png_ptr->transformations |= PNG_16_TO_8;
 }
 #endif
@@ -119,7 +113,8 @@ void PNGAPI
 png_set_strip_alpha(png_structp png_ptr)
 {
    png_debug(1, "in png_set_strip_alpha\n");
-   png_ptr->transformations |= PNG_STRIP_ALPHA;
+   if(png_ptr == NULL) return;
+   png_ptr->flags |= PNG_FLAG_STRIP_ALPHA;
 }
 #endif
 
@@ -148,6 +143,7 @@ png_set_dither(png_structp png_ptr, png_colorp palette,
    int full_dither)
 {
    png_debug(1, "in png_set_dither\n");
+   if(png_ptr == NULL) return;
    png_ptr->transformations |= PNG_DITHER;
 
    if (!full_dither)
@@ -531,6 +527,7 @@ void PNGAPI
 png_set_gamma(png_structp png_ptr, double scrn_gamma, double file_gamma)
 {
    png_debug(1, "in png_set_gamma\n");
+   if(png_ptr == NULL) return;
    if ((fabs(scrn_gamma * file_gamma - 1.0) > PNG_GAMMA_THRESHOLD) ||
        (png_ptr->color_type & PNG_COLOR_MASK_ALPHA) ||
        (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE))
@@ -549,7 +546,9 @@ void PNGAPI
 png_set_expand(png_structp png_ptr)
 {
    png_debug(1, "in png_set_expand\n");
-   png_ptr->transformations |= PNG_EXPAND;
+   if(png_ptr == NULL) return;
+   png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS);
+   png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
 }
 
 /* GRR 19990627:  the following three functions currently are identical
@@ -564,30 +563,53 @@ png_set_expand(png_structp png_ptr)
  *
  *  More to the point, these functions make it obvious what libpng will be
  *  doing, whereas "expand" can (and does) mean any number of things.
+ *
+ *  GRP 20060307: In libpng-1.4.0, png_set_gray_1_2_4_to_8() was modified
+ *  to expand only the sample depth but not to expand the tRNS to alpha.
  */
 
 /* Expand paletted images to RGB. */
 void PNGAPI
 png_set_palette_to_rgb(png_structp png_ptr)
 {
-   png_debug(1, "in png_set_expand\n");
-   png_ptr->transformations |= PNG_EXPAND;
+   png_debug(1, "in png_set_palette_to_rgb\n");
+   if(png_ptr == NULL) return;
+   png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS);
+   png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
 }
 
+#if !defined(PNG_1_0_X)
 /* Expand grayscale images of less than 8-bit depth to 8 bits. */
 void PNGAPI
+png_set_expand_gray_1_2_4_to_8(png_structp png_ptr)
+{
+   png_debug(1, "in png_set_expand_gray_1_2_4_to_8\n");
+   if(png_ptr == NULL) return;
+   png_ptr->transformations |= PNG_EXPAND;
+   png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
+}
+#endif
+
+#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
+/* Expand grayscale images of less than 8-bit depth to 8 bits. */
+/* Deprecated as of libpng-1.2.9 */
+void PNGAPI
 png_set_gray_1_2_4_to_8(png_structp png_ptr)
 {
-   png_debug(1, "in png_set_expand\n");
-   png_ptr->transformations |= PNG_EXPAND;
+   png_debug(1, "in png_set_gray_1_2_4_to_8\n");
+   if(png_ptr == NULL) return;
+   png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS);
 }
+#endif
+
 
 /* Expand tRNS chunks to alpha channels. */
 void PNGAPI
 png_set_tRNS_to_alpha(png_structp png_ptr)
 {
-   png_debug(1, "in png_set_expand\n");
-   png_ptr->transformations |= PNG_EXPAND;
+   png_debug(1, "in png_set_tRNS_to_alpha\n");
+   png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS);
+   png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
 }
 #endif /* defined(PNG_READ_EXPAND_SUPPORTED) */
 
@@ -597,6 +619,7 @@ png_set_gray_to_rgb(png_structp png_ptr)
 {
    png_debug(1, "in png_set_gray_to_rgb\n");
    png_ptr->transformations |= PNG_GRAY_TO_RGB;
+   png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
 }
 #endif
 
@@ -612,6 +635,7 @@ png_set_rgb_to_gray(png_structp png_ptr, int error_action, double red,
 {
       int red_fixed = (int)((float)red*100000.0 + 0.5);
       int green_fixed = (int)((float)green*100000.0 + 0.5);
+      if(png_ptr == NULL) return;
       png_set_rgb_to_gray_fixed(png_ptr, error_action, red_fixed, green_fixed);
 }
 #endif
@@ -621,6 +645,7 @@ png_set_rgb_to_gray_fixed(png_structp png_ptr, int error_action,
    png_fixed_point red, png_fixed_point green)
 {
    png_debug(1, "in png_set_rgb_to_gray\n");
+   if(png_ptr == NULL) return;
    switch(error_action)
    {
       case 1: png_ptr->transformations |= PNG_RGB_TO_GRAY;
@@ -671,6 +696,7 @@ png_set_read_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
    read_user_transform_fn)
 {
    png_debug(1, "in png_set_read_user_transform_fn\n");
+   if(png_ptr == NULL) return;
 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
    png_ptr->transformations |= PNG_USER_TRANSFORM;
    png_ptr->read_user_transform_fn = read_user_transform_fn;
@@ -700,28 +726,72 @@ png_init_read_transformations(png_structp png_ptr)
 #endif
 
 #if defined(PNG_READ_EXPAND_SUPPORTED) && defined(PNG_READ_BACKGROUND_SUPPORTED)
+
+#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
+   /* Detect gray background and attempt to enable optimization
+    * for gray --> RGB case */
+   /* Note:  if PNG_BACKGROUND_EXPAND is set and color_type is either RGB or
+    * RGB_ALPHA (in which case need_expand is superfluous anyway), the
+    * background color might actually be gray yet not be flagged as such.
+    * This is not a problem for the current code, which uses
+    * PNG_BACKGROUND_IS_GRAY only to decide when to do the
+    * png_do_gray_to_rgb() transformation.
+    */
+   if ((png_ptr->transformations & PNG_BACKGROUND_EXPAND) &&
+       !(color_type & PNG_COLOR_MASK_COLOR))
+   {
+          png_ptr->mode |= PNG_BACKGROUND_IS_GRAY;
+   } else if ((png_ptr->transformations & PNG_BACKGROUND) &&
+              !(png_ptr->transformations & PNG_BACKGROUND_EXPAND) &&
+              (png_ptr->transformations & PNG_GRAY_TO_RGB) &&
+              png_ptr->background.red == png_ptr->background.green &&
+              png_ptr->background.red == png_ptr->background.blue)
+   {
+          png_ptr->mode |= PNG_BACKGROUND_IS_GRAY;
+          png_ptr->background.gray = png_ptr->background.red;
+   }
+#endif
+
    if ((png_ptr->transformations & PNG_BACKGROUND_EXPAND) &&
        (png_ptr->transformations & PNG_EXPAND))
    {
       if (!(color_type & PNG_COLOR_MASK_COLOR))  /* i.e., GRAY or GRAY_ALPHA */
       {
-         /* expand background chunk. */
+         /* expand background and tRNS chunks */
          switch (png_ptr->bit_depth)
          {
             case 1:
                png_ptr->background.gray *= (png_uint_16)0xff;
                png_ptr->background.red = png_ptr->background.green
                  =  png_ptr->background.blue = png_ptr->background.gray;
+               if (!(png_ptr->transformations & PNG_EXPAND_tRNS))
+               {
+                 png_ptr->trans_values.gray *= (png_uint_16)0xff;
+                 png_ptr->trans_values.red = png_ptr->trans_values.green
+                   = png_ptr->trans_values.blue = png_ptr->trans_values.gray;
+               }
                break;
             case 2:
                png_ptr->background.gray *= (png_uint_16)0x55;
                png_ptr->background.red = png_ptr->background.green
                  = png_ptr->background.blue = png_ptr->background.gray;
+               if (!(png_ptr->transformations & PNG_EXPAND_tRNS))
+               {
+                 png_ptr->trans_values.gray *= (png_uint_16)0x55;
+                 png_ptr->trans_values.red = png_ptr->trans_values.green
+                   = png_ptr->trans_values.blue = png_ptr->trans_values.gray;
+               }
                break;
             case 4:
                png_ptr->background.gray *= (png_uint_16)0x11;
                png_ptr->background.red = png_ptr->background.green
                  = png_ptr->background.blue = png_ptr->background.gray;
+               if (!(png_ptr->transformations & PNG_EXPAND_tRNS))
+               {
+                 png_ptr->trans_values.gray *= (png_uint_16)0x11;
+                 png_ptr->trans_values.red = png_ptr->trans_values.green
+                   = png_ptr->trans_values.blue = png_ptr->trans_values.gray;
+               }
                break;
             case 8:
             case 16:
@@ -743,7 +813,7 @@ png_init_read_transformations(png_structp png_ptr)
         if (png_ptr->transformations & PNG_INVERT_ALPHA)
         {
 #if defined(PNG_READ_EXPAND_SUPPORTED)
-           if (!(png_ptr->transformations & PNG_EXPAND))
+           if (!(png_ptr->transformations & PNG_EXPAND_tRNS))
 #endif
            {
            /* invert the alpha channel (in tRNS) unless the pixels are
@@ -777,10 +847,11 @@ png_init_read_transformations(png_structp png_ptr)
         k=1; /* partial transparency is present */
     }
     if (k == 0)
-      png_ptr->transformations &= (~PNG_GAMMA);
+      png_ptr->transformations &= ~PNG_GAMMA;
    }
 
-   if (png_ptr->transformations & (PNG_GAMMA | PNG_RGB_TO_GRAY))
+   if ((png_ptr->transformations & (PNG_GAMMA | PNG_RGB_TO_GRAY)) &&
+        png_ptr->gamma != 0.0)
    {
       png_build_gamma_table(png_ptr);
 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
@@ -788,7 +859,7 @@ png_init_read_transformations(png_structp png_ptr)
       {
          if (color_type == PNG_COLOR_TYPE_PALETTE)
          {
-           /* could skip if no transparency and 
+           /* could skip if no transparency and
            */
             png_color back, back_1;
             png_colorp palette = png_ptr->palette;
@@ -883,6 +954,14 @@ png_init_read_transformations(png_structp png_ptr)
                   palette[i].blue = png_ptr->gamma_table[palette[i].blue];
                }
             }
+	    /* Prevent the transformations being done again, and make sure
+	     * that the now spurious alpha channel is stripped - the code
+	     * has just reduced background composition and gamma correction
+	     * to a simple alpha channel strip.
+	     */
+	    png_ptr->transformations &= ~PNG_BACKGROUND;
+	    png_ptr->transformations &= ~PNG_GAMMA;
+	    png_ptr->transformations |= PNG_STRIP_ALPHA;
          }
          /* if (png_ptr->background_gamma_type!=PNG_BACKGROUND_GAMMA_UNKNOWN) */
          else
@@ -957,6 +1036,9 @@ png_init_read_transformations(png_structp png_ptr)
             palette[i].green = png_ptr->gamma_table[palette[i].green];
             palette[i].blue = png_ptr->gamma_table[palette[i].blue];
          }
+
+	 /* Done the gamma correction. */
+	 png_ptr->transformations &= ~PNG_GAMMA;
       }
    }
 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
@@ -994,6 +1076,10 @@ png_init_read_transformations(png_structp png_ptr)
                png_ptr->trans[i], back.blue);
          }
       }
+
+      /* Handled alpha, still need to strip the channel. */
+      png_ptr->transformations &= ~PNG_BACKGROUND;
+      png_ptr->transformations |= PNG_STRIP_ALPHA;
    }
 #endif /* PNG_READ_BACKGROUND_SUPPORTED */
 
@@ -1042,7 +1128,8 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
    {
       if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
       {
-         if (png_ptr->num_trans)
+         if (png_ptr->num_trans &&
+              (png_ptr->transformations & PNG_EXPAND_tRNS))
             info_ptr->color_type = PNG_COLOR_TYPE_RGB_ALPHA;
          else
             info_ptr->color_type = PNG_COLOR_TYPE_RGB;
@@ -1052,7 +1139,14 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
       else
       {
          if (png_ptr->num_trans)
-            info_ptr->color_type |= PNG_COLOR_MASK_ALPHA;
+         {
+            if (png_ptr->transformations & PNG_EXPAND_tRNS)
+              info_ptr->color_type |= PNG_COLOR_MASK_ALPHA;
+#if 0 /* Removed from libpng-1.2.27 */
+            else
+              info_ptr->color_type |= PNG_COLOR_MASK_COLOR;
+#endif
+         }
          if (info_ptr->bit_depth < 8)
             info_ptr->bit_depth = 8;
          info_ptr->num_trans = 0;
@@ -1086,6 +1180,16 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
       info_ptr->bit_depth = 8;
 #endif
 
+#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
+   if (png_ptr->transformations & PNG_GRAY_TO_RGB)
+      info_ptr->color_type |= PNG_COLOR_MASK_COLOR;
+#endif
+
+#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
+   if (png_ptr->transformations & PNG_RGB_TO_GRAY)
+      info_ptr->color_type &= ~PNG_COLOR_MASK_COLOR;
+#endif
+
 #if defined(PNG_READ_DITHER_SUPPORTED)
    if (png_ptr->transformations & PNG_DITHER)
    {
@@ -1103,16 +1207,6 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
       info_ptr->bit_depth = 8;
 #endif
 
-#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
-   if (png_ptr->transformations & PNG_GRAY_TO_RGB)
-      info_ptr->color_type |= PNG_COLOR_MASK_COLOR;
-#endif
-
-#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
-   if (png_ptr->transformations & PNG_RGB_TO_GRAY)
-      info_ptr->color_type &= ~PNG_COLOR_MASK_COLOR;
-#endif
-
    if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
       info_ptr->channels = 1;
    else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR)
@@ -1121,7 +1215,7 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
       info_ptr->channels = 1;
 
 #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
-   if (png_ptr->transformations & PNG_STRIP_ALPHA)
+   if (png_ptr->flags & PNG_FLAG_STRIP_ALPHA)
       info_ptr->color_type &= ~PNG_COLOR_MASK_ALPHA;
 #endif
 
@@ -1173,19 +1267,29 @@ void /* PRIVATE */
 png_do_read_transformations(png_structp png_ptr)
 {
    png_debug(1, "in png_do_read_transformations\n");
-#if !defined(PNG_USELESS_TESTS_SUPPORTED)
    if (png_ptr->row_buf == NULL)
    {
 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
       char msg[50];
 
-      sprintf(msg, "NULL row buffer for row %ld, pass %d", png_ptr->row_number,
+      png_snprintf2(msg, 50,
+         "NULL row buffer for row %ld, pass %d", png_ptr->row_number,
          png_ptr->pass);
       png_error(png_ptr, msg);
 #else
       png_error(png_ptr, "NULL row buffer");
 #endif
    }
+#ifdef PNG_WARN_UNINITIALIZED_ROW
+   if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
+      /* Application has failed to call either png_read_start_image()
+       * or png_read_update_info() after setting transforms that expand
+       * pixels.  This check added to libpng-1.2.19 */
+#if (PNG_WARN_UNINITIALIZED_ROW==1)
+      png_error(png_ptr, "Uninitialized row");
+#else
+      png_warning(png_ptr, "Uninitialized row");
+#endif
 #endif
 
 #if defined(PNG_READ_EXPAND_SUPPORTED)
@@ -1198,7 +1302,8 @@ png_do_read_transformations(png_structp png_ptr)
       }
       else
       {
-         if (png_ptr->num_trans)
+         if (png_ptr->num_trans &&
+             (png_ptr->transformations & PNG_EXPAND_tRNS))
             png_do_expand(&(png_ptr->row_info), png_ptr->row_buf + 1,
                &(png_ptr->trans_values));
          else
@@ -1209,9 +1314,9 @@ png_do_read_transformations(png_structp png_ptr)
 #endif
 
 #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
-   if (png_ptr->transformations & PNG_STRIP_ALPHA)
+   if (png_ptr->flags & PNG_FLAG_STRIP_ALPHA)
       png_do_strip_filler(&(png_ptr->row_info), png_ptr->row_buf + 1,
-         PNG_FLAG_FILLER_AFTER,png_ptr->transformations);
+         PNG_FLAG_FILLER_AFTER | (png_ptr->flags & PNG_FLAG_STRIP_ALPHA));
 #endif
 
 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
@@ -1222,9 +1327,11 @@ png_do_read_transformations(png_structp png_ptr)
       if(rgb_error)
       {
          png_ptr->rgb_to_gray_status=1;
-         if(png_ptr->transformations == PNG_RGB_TO_GRAY_WARN)
+         if((png_ptr->transformations & PNG_RGB_TO_GRAY) == 
+             PNG_RGB_TO_GRAY_WARN)
             png_warning(png_ptr, "png_do_rgb_to_gray found nongray pixel");
-         if(png_ptr->transformations == PNG_RGB_TO_GRAY_ERR)
+         if((png_ptr->transformations & PNG_RGB_TO_GRAY) ==
+             PNG_RGB_TO_GRAY_ERR)
             png_error(png_ptr, "png_do_rgb_to_gray found nongray pixel");
       }
    }
@@ -2104,7 +2211,7 @@ png_do_gray_to_rgb(png_row_infop row_info, png_bytep row)
 /* reduce RGB files to grayscale, with or without alpha
  * using the equation given in Poynton's ColorFAQ at
  * <http://www.inforamp.net/~poynton/>
- * Copyright (c) 1998-01-04 Charles Poynton poynton@inforamp.net
+ * Copyright (c) 1998-01-04 Charles Poynton poynton at inforamp.net
  *
  *     Y = 0.212671 * R + 0.715160 * G + 0.072169 * B
  *
@@ -3601,8 +3708,8 @@ png_do_expand_palette(png_row_infop row_info, png_bytep row,
    }
 }
 
-/* If the bit depth < 8, it is expanded to 8.  Also, if the
- * transparency value is supplied, an alpha channel is built.
+/* If the bit depth < 8, it is expanded to 8.  Also, if the already
+ * expanded transparency value is supplied, an alpha channel is built.
  */
 void /* PRIVATE */
 png_do_expand(png_row_infop row_info, png_bytep row,
@@ -3628,7 +3735,7 @@ png_do_expand(png_row_infop row_info, png_bytep row,
             {
                case 1:
                {
-                  gray = (png_uint_16)(gray*0xff);
+                  gray = (png_uint_16)((gray&0x01)*0xff);
                   sp = row + (png_size_t)((row_width - 1) >> 3);
                   dp = row + (png_size_t)row_width - 1;
                   shift = 7 - (int)((row_width + 7) & 0x07);
@@ -3652,7 +3759,7 @@ png_do_expand(png_row_infop row_info, png_bytep row,
                }
                case 2:
                {
-                  gray = (png_uint_16)(gray*0x55);
+                  gray = (png_uint_16)((gray&0x03)*0x55);
                   sp = row + (png_size_t)((row_width - 1) >> 2);
                   dp = row + (png_size_t)row_width - 1;
                   shift = (int)((3 - ((row_width + 3) & 0x03)) << 1);
@@ -3675,7 +3782,7 @@ png_do_expand(png_row_infop row_info, png_bytep row,
                }
                case 4:
                {
-                  gray = (png_uint_16)(gray*0x11);
+                  gray = (png_uint_16)((gray&0x0f)*0x11);
                   sp = row + (png_size_t)((row_width - 1) >> 1);
                   dp = row + (png_size_t)row_width - 1;
                   shift = (int)((1 - ((row_width + 1) & 0x01)) << 2);
@@ -3705,6 +3812,7 @@ png_do_expand(png_row_infop row_info, png_bytep row,
          {
             if (row_info->bit_depth == 8)
             {
+               gray = gray & 0xff;
                sp = row + (png_size_t)row_width - 1;
                dp = row + (png_size_t)(row_width << 1) - 1;
                for (i = 0; i < row_width; i++)
@@ -3718,12 +3826,13 @@ png_do_expand(png_row_infop row_info, png_bytep row,
             }
             else if (row_info->bit_depth == 16)
             {
+               png_byte gray_high = (gray >> 8) & 0xff;
+               png_byte gray_low = gray & 0xff;
                sp = row + row_info->rowbytes - 1;
                dp = row + (row_info->rowbytes << 1) - 1;
                for (i = 0; i < row_width; i++)
                {
-                  if (((png_uint_16)*(sp) |
-                     ((png_uint_16)*(sp - 1) << 8)) == gray)
+                  if (*(sp-1) == gray_high && *(sp) == gray_low) 
                   {
                      *dp-- = 0;
                      *dp-- = 0;
@@ -3748,13 +3857,14 @@ png_do_expand(png_row_infop row_info, png_bytep row,
       {
          if (row_info->bit_depth == 8)
          {
+            png_byte red = trans_value->red & 0xff;
+            png_byte green = trans_value->green & 0xff;
+            png_byte blue = trans_value->blue & 0xff;
             sp = row + (png_size_t)row_info->rowbytes - 1;
             dp = row + (png_size_t)(row_width << 2) - 1;
             for (i = 0; i < row_width; i++)
             {
-               if (*(sp - 2) == trans_value->red &&
-                  *(sp - 1) == trans_value->green &&
-                  *(sp - 0) == trans_value->blue)
+               if (*(sp - 2) == red && *(sp - 1) == green && *(sp) == blue)
                   *dp-- = 0;
                else
                   *dp-- = 0xff;
@@ -3765,16 +3875,22 @@ png_do_expand(png_row_infop row_info, png_bytep row,
          }
          else if (row_info->bit_depth == 16)
          {
+            png_byte red_high = (trans_value->red >> 8) & 0xff;
+            png_byte green_high = (trans_value->green >> 8) & 0xff;
+            png_byte blue_high = (trans_value->blue >> 8) & 0xff;
+            png_byte red_low = trans_value->red & 0xff;
+            png_byte green_low = trans_value->green & 0xff;
+            png_byte blue_low = trans_value->blue & 0xff;
             sp = row + row_info->rowbytes - 1;
             dp = row + (png_size_t)(row_width << 3) - 1;
             for (i = 0; i < row_width; i++)
             {
-               if ((((png_uint_16)*(sp - 4) |
-                  ((png_uint_16)*(sp - 5) << 8)) == trans_value->red) &&
-                  (((png_uint_16)*(sp - 2) |
-                  ((png_uint_16)*(sp - 3) << 8)) == trans_value->green) &&
-                  (((png_uint_16)*(sp - 0) |
-                  ((png_uint_16)*(sp - 1) << 8)) == trans_value->blue))
+               if (*(sp - 5) == red_high &&
+                  *(sp - 4) == red_low &&
+                  *(sp - 3) == green_high &&
+                  *(sp - 2) == green_low &&
+                  *(sp - 1) == blue_high &&
+                  *(sp    ) == blue_low)
                {
                   *dp-- = 0;
                   *dp-- = 0;
@@ -3894,8 +4010,8 @@ png_do_dither(png_row_infop row_info, png_bytep row,
 
 #ifdef PNG_FLOATING_POINT_SUPPORTED
 #if defined(PNG_READ_GAMMA_SUPPORTED)
-static int png_gamma_shift[] =
-   {0x10, 0x21, 0x42, 0x84, 0x110, 0x248, 0x550, 0xff0};
+static PNG_CONST int png_gamma_shift[] =
+   {0x10, 0x21, 0x42, 0x84, 0x110, 0x248, 0x550, 0xff0, 0x00};
 
 /* We build the 8- or 16-bit gamma tables here.  Note that for 16-bit
  * tables, we don't make a full table if we are reducing to 8-bit in
@@ -3906,210 +4022,208 @@ void /* PRIVATE */
 png_build_gamma_table(png_structp png_ptr)
 {
   png_debug(1, "in png_build_gamma_table\n");
-  if(png_ptr->gamma != 0.0)
+
+  if (png_ptr->bit_depth <= 8)
   {
-   if (png_ptr->bit_depth <= 8)
-   {
-      int i;
-      double g;
+     int i;
+     double g;
 
-      if (png_ptr->screen_gamma > .000001)
-         g = 1.0 / (png_ptr->gamma * png_ptr->screen_gamma);
-      else
-         g = 1.0;
+     if (png_ptr->screen_gamma > .000001)
+        g = 1.0 / (png_ptr->gamma * png_ptr->screen_gamma);
+     else
+        g = 1.0;
 
-      png_ptr->gamma_table = (png_bytep)png_malloc(png_ptr,
-         (png_uint_32)256);
+     png_ptr->gamma_table = (png_bytep)png_malloc(png_ptr,
+        (png_uint_32)256);
 
-      for (i = 0; i < 256; i++)
-      {
-         png_ptr->gamma_table[i] = (png_byte)(pow((double)i / 255.0,
-            g) * 255.0 + .5);
-      }
+     for (i = 0; i < 256; i++)
+     {
+        png_ptr->gamma_table[i] = (png_byte)(pow((double)i / 255.0,
+           g) * 255.0 + .5);
+     }
 
 #if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
-    defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
-      if (png_ptr->transformations & ((PNG_BACKGROUND) | PNG_RGB_TO_GRAY))
-      {
+   defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
+     if (png_ptr->transformations & ((PNG_BACKGROUND) | PNG_RGB_TO_GRAY))
+     {
 
-         g = 1.0 / (png_ptr->gamma);
+        g = 1.0 / (png_ptr->gamma);
 
-         png_ptr->gamma_to_1 = (png_bytep)png_malloc(png_ptr,
-            (png_uint_32)256);
+        png_ptr->gamma_to_1 = (png_bytep)png_malloc(png_ptr,
+           (png_uint_32)256);
 
-         for (i = 0; i < 256; i++)
-         {
-            png_ptr->gamma_to_1[i] = (png_byte)(pow((double)i / 255.0,
-               g) * 255.0 + .5);
-         }
+        for (i = 0; i < 256; i++)
+        {
+           png_ptr->gamma_to_1[i] = (png_byte)(pow((double)i / 255.0,
+              g) * 255.0 + .5);
+        }
 
 
-         png_ptr->gamma_from_1 = (png_bytep)png_malloc(png_ptr,
-            (png_uint_32)256);
+        png_ptr->gamma_from_1 = (png_bytep)png_malloc(png_ptr,
+           (png_uint_32)256);
 
-         if(png_ptr->screen_gamma > 0.000001)
-            g = 1.0 / png_ptr->screen_gamma;
-         else
-            g = png_ptr->gamma;   /* probably doing rgb_to_gray */
+        if(png_ptr->screen_gamma > 0.000001)
+           g = 1.0 / png_ptr->screen_gamma;
+        else
+           g = png_ptr->gamma;   /* probably doing rgb_to_gray */
 
-         for (i = 0; i < 256; i++)
-         {
-            png_ptr->gamma_from_1[i] = (png_byte)(pow((double)i / 255.0,
-               g) * 255.0 + .5);
+        for (i = 0; i < 256; i++)
+        {
+           png_ptr->gamma_from_1[i] = (png_byte)(pow((double)i / 255.0,
+              g) * 255.0 + .5);
 
-         }
-      }
+        }
+     }
 #endif /* PNG_READ_BACKGROUND_SUPPORTED || PNG_RGB_TO_GRAY_SUPPORTED */
-   }
-   else
-   {
-      double g;
-      int i, j, shift, num;
-      int sig_bit;
-      png_uint_32 ig;
+  }
+  else
+  {
+     double g;
+     int i, j, shift, num;
+     int sig_bit;
+     png_uint_32 ig;
 
-      if (png_ptr->color_type & PNG_COLOR_MASK_COLOR)
-      {
-         sig_bit = (int)png_ptr->sig_bit.red;
-         if ((int)png_ptr->sig_bit.green > sig_bit)
-            sig_bit = png_ptr->sig_bit.green;
-         if ((int)png_ptr->sig_bit.blue > sig_bit)
-            sig_bit = png_ptr->sig_bit.blue;
-      }
-      else
-      {
-         sig_bit = (int)png_ptr->sig_bit.gray;
-      }
+     if (png_ptr->color_type & PNG_COLOR_MASK_COLOR)
+     {
+        sig_bit = (int)png_ptr->sig_bit.red;
+        if ((int)png_ptr->sig_bit.green > sig_bit)
+           sig_bit = png_ptr->sig_bit.green;
+        if ((int)png_ptr->sig_bit.blue > sig_bit)
+           sig_bit = png_ptr->sig_bit.blue;
+     }
+     else
+     {
+        sig_bit = (int)png_ptr->sig_bit.gray;
+     }
 
-      if (sig_bit > 0)
-         shift = 16 - sig_bit;
-      else
-         shift = 0;
+     if (sig_bit > 0)
+        shift = 16 - sig_bit;
+     else
+        shift = 0;
 
-      if (png_ptr->transformations & PNG_16_TO_8)
-      {
-         if (shift < (16 - PNG_MAX_GAMMA_8))
-            shift = (16 - PNG_MAX_GAMMA_8);
-      }
+     if (png_ptr->transformations & PNG_16_TO_8)
+     {
+        if (shift < (16 - PNG_MAX_GAMMA_8))
+           shift = (16 - PNG_MAX_GAMMA_8);
+     }
 
-      if (shift > 8)
-         shift = 8;
-      if (shift < 0)
-         shift = 0;
+     if (shift > 8)
+        shift = 8;
+     if (shift < 0)
+        shift = 0;
 
-      png_ptr->gamma_shift = (png_byte)shift;
+     png_ptr->gamma_shift = (png_byte)shift;
 
-      num = (1 << (8 - shift));
+     num = (1 << (8 - shift));
 
-      if (png_ptr->screen_gamma > .000001)
-         g = 1.0 / (png_ptr->gamma * png_ptr->screen_gamma);
-      else
-         g = 1.0;
+     if (png_ptr->screen_gamma > .000001)
+        g = 1.0 / (png_ptr->gamma * png_ptr->screen_gamma);
+     else
+        g = 1.0;
 
-      png_ptr->gamma_16_table = (png_uint_16pp)png_malloc(png_ptr,
-         (png_uint_32)(num * png_sizeof (png_uint_16p)));
+     png_ptr->gamma_16_table = (png_uint_16pp)png_malloc(png_ptr,
+        (png_uint_32)(num * png_sizeof (png_uint_16p)));
 
-      if (png_ptr->transformations & (PNG_16_TO_8 | PNG_BACKGROUND))
-      {
-         double fin, fout;
-         png_uint_32 last, max;
+     if (png_ptr->transformations & (PNG_16_TO_8 | PNG_BACKGROUND))
+     {
+        double fin, fout;
+        png_uint_32 last, max;
 
-         for (i = 0; i < num; i++)
-         {
-            png_ptr->gamma_16_table[i] = (png_uint_16p)png_malloc(png_ptr,
-               (png_uint_32)(256 * png_sizeof (png_uint_16)));
-         }
+        for (i = 0; i < num; i++)
+        {
+           png_ptr->gamma_16_table[i] = (png_uint_16p)png_malloc(png_ptr,
+              (png_uint_32)(256 * png_sizeof (png_uint_16)));
+        }
 
-         g = 1.0 / g;
-         last = 0;
-         for (i = 0; i < 256; i++)
-         {
-            fout = ((double)i + 0.5) / 256.0;
-            fin = pow(fout, g);
-            max = (png_uint_32)(fin * (double)((png_uint_32)num << 8));
-            while (last <= max)
-            {
-               png_ptr->gamma_16_table[(int)(last & (0xff >> shift))]
-                  [(int)(last >> (8 - shift))] = (png_uint_16)(
-                  (png_uint_16)i | ((png_uint_16)i << 8));
-               last++;
-            }
-         }
-         while (last < ((png_uint_32)num << 8))
-         {
-            png_ptr->gamma_16_table[(int)(last & (0xff >> shift))]
-               [(int)(last >> (8 - shift))] = (png_uint_16)65535L;
-            last++;
-         }
-      }
-      else
-      {
-         for (i = 0; i < num; i++)
-         {
-            png_ptr->gamma_16_table[i] = (png_uint_16p)png_malloc(png_ptr,
-               (png_uint_32)(256 * png_sizeof (png_uint_16)));
+        g = 1.0 / g;
+        last = 0;
+        for (i = 0; i < 256; i++)
+        {
+           fout = ((double)i + 0.5) / 256.0;
+           fin = pow(fout, g);
+           max = (png_uint_32)(fin * (double)((png_uint_32)num << 8));
+           while (last <= max)
+           {
+              png_ptr->gamma_16_table[(int)(last & (0xff >> shift))]
+                 [(int)(last >> (8 - shift))] = (png_uint_16)(
+                 (png_uint_16)i | ((png_uint_16)i << 8));
+              last++;
+           }
+        }
+        while (last < ((png_uint_32)num << 8))
+        {
+           png_ptr->gamma_16_table[(int)(last & (0xff >> shift))]
+              [(int)(last >> (8 - shift))] = (png_uint_16)65535L;
+           last++;
+        }
+     }
+     else
+     {
+        for (i = 0; i < num; i++)
+        {
+           png_ptr->gamma_16_table[i] = (png_uint_16p)png_malloc(png_ptr,
+              (png_uint_32)(256 * png_sizeof (png_uint_16)));
 
-            ig = (((png_uint_32)i * (png_uint_32)png_gamma_shift[shift]) >> 4);
-            for (j = 0; j < 256; j++)
-            {
-               png_ptr->gamma_16_table[i][j] =
-                  (png_uint_16)(pow((double)(ig + ((png_uint_32)j << 8)) /
-                     65535.0, g) * 65535.0 + .5);
-            }
-         }
-      }
+           ig = (((png_uint_32)i * (png_uint_32)png_gamma_shift[shift]) >> 4);
+           for (j = 0; j < 256; j++)
+           {
+              png_ptr->gamma_16_table[i][j] =
+                 (png_uint_16)(pow((double)(ig + ((png_uint_32)j << 8)) /
+                    65535.0, g) * 65535.0 + .5);
+           }
+        }
+     }
 
 #if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
-    defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
-      if (png_ptr->transformations & (PNG_BACKGROUND | PNG_RGB_TO_GRAY))
-      {
+   defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
+     if (png_ptr->transformations & (PNG_BACKGROUND | PNG_RGB_TO_GRAY))
+     {
 
-         g = 1.0 / (png_ptr->gamma);
+        g = 1.0 / (png_ptr->gamma);
 
-         png_ptr->gamma_16_to_1 = (png_uint_16pp)png_malloc(png_ptr,
-            (png_uint_32)(num * png_sizeof (png_uint_16p )));
+        png_ptr->gamma_16_to_1 = (png_uint_16pp)png_malloc(png_ptr,
+           (png_uint_32)(num * png_sizeof (png_uint_16p )));
 
-         for (i = 0; i < num; i++)
-         {
-            png_ptr->gamma_16_to_1[i] = (png_uint_16p)png_malloc(png_ptr,
-               (png_uint_32)(256 * png_sizeof (png_uint_16)));
+        for (i = 0; i < num; i++)
+        {
+           png_ptr->gamma_16_to_1[i] = (png_uint_16p)png_malloc(png_ptr,
+              (png_uint_32)(256 * png_sizeof (png_uint_16)));
 
-            ig = (((png_uint_32)i *
-               (png_uint_32)png_gamma_shift[shift]) >> 4);
-            for (j = 0; j < 256; j++)
-            {
-               png_ptr->gamma_16_to_1[i][j] =
-                  (png_uint_16)(pow((double)(ig + ((png_uint_32)j << 8)) /
-                     65535.0, g) * 65535.0 + .5);
-            }
-         }
+           ig = (((png_uint_32)i *
+              (png_uint_32)png_gamma_shift[shift]) >> 4);
+           for (j = 0; j < 256; j++)
+           {
+              png_ptr->gamma_16_to_1[i][j] =
+                 (png_uint_16)(pow((double)(ig + ((png_uint_32)j << 8)) /
+                    65535.0, g) * 65535.0 + .5);
+           }
+        }
 
-         if(png_ptr->screen_gamma > 0.000001)
-            g = 1.0 / png_ptr->screen_gamma;
-         else
-            g = png_ptr->gamma;   /* probably doing rgb_to_gray */
+        if(png_ptr->screen_gamma > 0.000001)
+           g = 1.0 / png_ptr->screen_gamma;
+        else
+           g = png_ptr->gamma;   /* probably doing rgb_to_gray */
 
-         png_ptr->gamma_16_from_1 = (png_uint_16pp)png_malloc(png_ptr,
-            (png_uint_32)(num * png_sizeof (png_uint_16p)));
+        png_ptr->gamma_16_from_1 = (png_uint_16pp)png_malloc(png_ptr,
+           (png_uint_32)(num * png_sizeof (png_uint_16p)));
 
-         for (i = 0; i < num; i++)
-         {
-            png_ptr->gamma_16_from_1[i] = (png_uint_16p)png_malloc(png_ptr,
-               (png_uint_32)(256 * png_sizeof (png_uint_16)));
+        for (i = 0; i < num; i++)
+        {
+           png_ptr->gamma_16_from_1[i] = (png_uint_16p)png_malloc(png_ptr,
+              (png_uint_32)(256 * png_sizeof (png_uint_16)));
 
-            ig = (((png_uint_32)i *
-               (png_uint_32)png_gamma_shift[shift]) >> 4);
-            for (j = 0; j < 256; j++)
-            {
-               png_ptr->gamma_16_from_1[i][j] =
-                  (png_uint_16)(pow((double)(ig + ((png_uint_32)j << 8)) /
-                     65535.0, g) * 65535.0 + .5);
-            }
-         }
-      }
+           ig = (((png_uint_32)i *
+              (png_uint_32)png_gamma_shift[shift]) >> 4);
+           for (j = 0; j < 256; j++)
+           {
+              png_ptr->gamma_16_from_1[i][j] =
+                 (png_uint_16)(pow((double)(ig + ((png_uint_32)j << 8)) /
+                    65535.0, g) * 65535.0 + .5);
+           }
+        }
+     }
 #endif /* PNG_READ_BACKGROUND_SUPPORTED || PNG_RGB_TO_GRAY_SUPPORTED */
-   }
- }
+  }
 }
 #endif
 /* To do: install integer version of png_build_gamma_table here */
@@ -4175,3 +4289,4 @@ png_do_read_intrapixel(png_row_infop row_info, png_bytep row)
    }
 }
 #endif /* PNG_MNG_FEATURES_SUPPORTED */
+#endif /* PNG_READ_SUPPORTED */

pngrutil.c

@@ -1,8 +1,9 @@
+
 /* pngrutil.c - utilities to read a PNG file
  *
- * libpng version 1.2.8beta1 - November 1, 2004
+ * Last changed in libpng 1.2.27 [April 29, 2008]
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2004 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2008 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
@@ -13,41 +14,49 @@
 #define PNG_INTERNAL
 #include "png.h"
 
-#if defined(_WIN32_WCE)
+#if defined(PNG_READ_SUPPORTED)
+
+#if defined(_WIN32_WCE) && (_WIN32_WCE<0x500)
+#  define WIN32_WCE_OLD
+#endif
+
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+#  if defined(WIN32_WCE_OLD)
 /* strtod() function is not supported on WindowsCE */
-#  ifdef PNG_FLOATING_POINT_SUPPORTED
-__inline double strtod(const char *nptr, char **endptr)
+__inline double png_strtod(png_structp png_ptr, PNG_CONST char *nptr, char **endptr)
 {
    double result = 0;
    int len;
    wchar_t *str, *end;
 
    len = MultiByteToWideChar(CP_ACP, 0, nptr, -1, NULL, 0);
-   str = (wchar_t *)malloc(len * sizeof(wchar_t));
+   str = (wchar_t *)png_malloc(png_ptr, len * sizeof(wchar_t));
    if ( NULL != str )
    {
       MultiByteToWideChar(CP_ACP, 0, nptr, -1, str, len);
       result = wcstod(str, &end);
       len = WideCharToMultiByte(CP_ACP, 0, end, -1, NULL, 0, NULL, NULL);
       *endptr = (char *)nptr + (png_strlen(nptr) - len + 1);
-      free(str);
+      png_free(png_ptr, str);
    }
    return result;
 }
+#  else
+#    define png_strtod(p,a,b) strtod(a,b)
 #  endif
 #endif
 
-png_uint_32 /* PRIVATE */
+png_uint_32 PNGAPI
 png_get_uint_31(png_structp png_ptr, png_bytep buf)
 {
    png_uint_32 i = png_get_uint_32(buf);
    if (i > PNG_UINT_31_MAX)
-     png_error(png_ptr, "PNG unsigned integer out of range.\n");
+     png_error(png_ptr, "PNG unsigned integer out of range.");
    return (i);
 }
 #ifndef PNG_READ_BIG_ENDIAN_SUPPORTED
 /* Grab an unsigned 32-bit integer from a buffer in big-endian format. */
-png_uint_32 /* PRIVATE */
+png_uint_32 PNGAPI
 png_get_uint_32(png_bytep buf)
 {
    png_uint_32 i = ((png_uint_32)(*buf) << 24) +
@@ -58,11 +67,10 @@ png_get_uint_32(png_bytep buf)
    return (i);
 }
 
-#if defined(PNG_READ_pCAL_SUPPORTED) || defined(PNG_READ_oFFs_SUPPORTED)
 /* Grab a signed 32-bit integer from a buffer in big-endian format.  The
  * data is stored in the PNG file in two's complement format, and it is
  * assumed that the machine format for signed integers is the same. */
-png_int_32 /* PRIVATE */
+png_int_32 PNGAPI
 png_get_int_32(png_bytep buf)
 {
    png_int_32 i = ((png_int_32)(*buf) << 24) +
@@ -72,10 +80,9 @@ png_get_int_32(png_bytep buf)
 
    return (i);
 }
-#endif /* PNG_READ_pCAL_SUPPORTED */
 
 /* Grab an unsigned 16-bit integer from a buffer in big-endian format. */
-png_uint_16 /* PRIVATE */
+png_uint_16 PNGAPI
 png_get_uint_16(png_bytep buf)
 {
    png_uint_16 i = (png_uint_16)(((png_uint_16)(*buf) << 8) +
@@ -89,6 +96,7 @@ png_get_uint_16(png_bytep buf)
 void /* PRIVATE */
 png_crc_read(png_structp png_ptr, png_bytep buf, png_size_t length)
 {
+   if(png_ptr == NULL) return;
    png_read_data(png_ptr, buf, length);
    png_calculate_crc(png_ptr, buf, length);
 }
@@ -177,7 +185,7 @@ png_decompress_chunk(png_structp png_ptr, int comp_type,
                               png_charp chunkdata, png_size_t chunklength,
                               png_size_t prefix_size, png_size_t *newlength)
 {
-   static char msg[] = "Error decoding compressed text";
+   static PNG_CONST char msg[] = "Error decoding compressed text";
    png_charp text;
    png_size_t text_size;
 
@@ -222,7 +230,7 @@ png_decompress_chunk(png_structp png_ptr, int comp_type,
             text_size = (png_size_t)(chunklength - (text - chunkdata) - 1);
             text_size = png_sizeof(msg) > text_size ? text_size :
                png_sizeof(msg);
-            png_memcpy(text + prefix_size, msg, text_size + 1);
+            png_memcpy(text + prefix_size, msg, text_size);
             break;
          }
          if (!png_ptr->zstream.avail_out || ret == Z_STREAM_END)
@@ -275,16 +283,19 @@ png_decompress_chunk(png_structp png_ptr, int comp_type,
       if (ret != Z_STREAM_END)
       {
 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
-         char umsg[50];
+         char umsg[52];
 
          if (ret == Z_BUF_ERROR)
-            sprintf(umsg,"Buffer error in compressed datastream in %s chunk",
+            png_snprintf(umsg, 52,
+                "Buffer error in compressed datastream in %s chunk",
                 png_ptr->chunk_name);
          else if (ret == Z_DATA_ERROR)
-            sprintf(umsg,"Data error in compressed datastream in %s chunk",
+            png_snprintf(umsg, 52,
+                "Data error in compressed datastream in %s chunk",
                 png_ptr->chunk_name);
          else
-            sprintf(umsg,"Incomplete compressed datastream in %s chunk",
+            png_snprintf(umsg, 52,
+                "Incomplete compressed datastream in %s chunk",
                 png_ptr->chunk_name);
          png_warning(png_ptr, umsg);
 #else
@@ -317,7 +328,8 @@ png_decompress_chunk(png_structp png_ptr, int comp_type,
 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
       char umsg[50];
 
-      sprintf(umsg, "Unknown zTXt compression type %d", comp_type);
+      png_snprintf(umsg, 50,
+         "Unknown zTXt compression type %d", comp_type);
       png_warning(png_ptr, umsg);
 #else
       png_warning(png_ptr, "Unknown zTXt compression type");
@@ -559,8 +571,7 @@ png_handle_IEND(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    }
    png_crc_finish(png_ptr, length);
 
-   if (&info_ptr == NULL) /* quiet compiler warnings about unused info_ptr */
-      return;
+   info_ptr =info_ptr; /* quiet compiler warnings about unused info_ptr */
 }
 
 #if defined(PNG_READ_gAMA_SUPPORTED)
@@ -619,7 +630,7 @@ png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
       }
 
 #if defined(PNG_READ_sRGB_SUPPORTED)
-   if (info_ptr->valid & PNG_INFO_sRGB)
+   if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB))
       if (PNG_OUT_OF_RANGE(igamma, 45500L, 500))
       {
          png_warning(png_ptr,
@@ -777,8 +788,7 @@ png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    png_crc_read(png_ptr, buf, 4);
    uint_y = png_get_uint_32(buf);
 
-   if (uint_x > 80000L || uint_y > 80000L ||
-      uint_x + uint_y > 100000L)
+   if (uint_x + uint_y > 100000L)
    {
       png_warning(png_ptr, "Invalid cHRM red point");
       png_crc_finish(png_ptr, 16);
@@ -793,8 +803,7 @@ png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    png_crc_read(png_ptr, buf, 4);
    uint_y = png_get_uint_32(buf);
 
-   if (uint_x > 80000L || uint_y > 80000L ||
-      uint_x + uint_y > 100000L)
+   if (uint_x + uint_y > 100000L)
    {
       png_warning(png_ptr, "Invalid cHRM green point");
       png_crc_finish(png_ptr, 8);
@@ -809,8 +818,7 @@ png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    png_crc_read(png_ptr, buf, 4);
    uint_y = png_get_uint_32(buf);
 
-   if (uint_x > 80000L || uint_y > 80000L ||
-      uint_x + uint_y > 100000L)
+   if (uint_x + uint_y > 100000L)
    {
       png_warning(png_ptr, "Invalid cHRM blue point");
       png_crc_finish(png_ptr, 0);
@@ -831,7 +839,7 @@ png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 #endif
 
 #if defined(PNG_READ_sRGB_SUPPORTED)
-   if (info_ptr->valid & PNG_INFO_sRGB)
+   if ((info_ptr != NULL) && (info_ptr->valid & PNG_INFO_sRGB))
       {
       if (PNG_OUT_OF_RANGE(int_x_white, 31270,  1000) ||
           PNG_OUT_OF_RANGE(int_y_white, 32900,  1000) ||
@@ -842,7 +850,6 @@ png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
           PNG_OUT_OF_RANGE(int_x_blue,  15000,  1000) ||
           PNG_OUT_OF_RANGE(int_y_blue,   6000,  1000))
          {
-
             png_warning(png_ptr,
               "Ignoring incorrect cHRM value when sRGB is also present");
 #ifndef PNG_NO_CONSOLE_IO
@@ -926,7 +933,7 @@ png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    }
 
 #if defined(PNG_READ_gAMA_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED)
-   if ((info_ptr->valid & PNG_INFO_gAMA))
+   if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA))
    {
    png_fixed_point igamma;
 #ifdef PNG_FIXED_POINT_SUPPORTED
@@ -955,7 +962,7 @@ png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 
 #ifdef PNG_READ_cHRM_SUPPORTED
 #ifdef PNG_FIXED_POINT_SUPPORTED
-   if (info_ptr->valid & PNG_INFO_cHRM)
+   if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
       if (PNG_OUT_OF_RANGE(info_ptr->int_x_white, 31270,  1000) ||
           PNG_OUT_OF_RANGE(info_ptr->int_y_white, 32900,  1000) ||
           PNG_OUT_OF_RANGE(info_ptr->int_x_red,   64000L, 1000) ||
@@ -1037,7 +1044,7 @@ png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 
    /* there should be at least one zero (the compression type byte)
       following the separator, and we should be on it  */
-   if ( profile >= chunkdata + slength)
+   if ( profile >= chunkdata + slength - 1)
    {
       png_free(png_ptr, chunkdata);
       png_warning(png_ptr, "Malformed iCCP chunk");
@@ -1079,7 +1086,7 @@ png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    if(profile_size > profile_length)
    {
       png_free(png_ptr, chunkdata);
-      png_warning(png_ptr, "Ignoring truncated iCCP profile.\n");
+      png_warning(png_ptr, "Ignoring truncated iCCP profile.");
       return;
    }
 
@@ -1141,7 +1148,7 @@ png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    ++entry_start;
 
    /* a sample depth should follow the separator, and we should be on it  */
-   if (entry_start > chunkdata + slength)
+   if (entry_start > chunkdata + slength - 2)
    {
       png_free(png_ptr, chunkdata);
       png_warning(png_ptr, "malformed sPLT chunk");
@@ -1160,7 +1167,7 @@ png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
       return;
    }
 
-   new_palette.nentries = (png_uint_32) (data_length / entry_size);
+   new_palette.nentries = (png_int_32) ( data_length / entry_size);
    if ((png_uint_32) new_palette.nentries > (png_uint_32) (PNG_SIZE_MAX /
        png_sizeof(png_sPLT_entry)))
    {
@@ -1314,7 +1321,10 @@ png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    }
 
    if (png_crc_finish(png_ptr, 0))
+   {
+      png_ptr->num_trans = 0;
       return;
+   }
 
    png_set_tRNS(png_ptr, info_ptr, readbuf, png_ptr->num_trans,
       &(png_ptr->trans_values));
@@ -1377,7 +1387,7 @@ png_handle_bKGD(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
    {
       png_ptr->background.index = buf[0];
-      if(info_ptr->num_palette)
+      if (info_ptr && info_ptr->num_palette)
       {
           if(buf[0] > info_ptr->num_palette)
           {
@@ -1657,7 +1667,7 @@ png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
       buf++; /* Skip the null string terminator from previous parameter. */
 
       png_debug1(3, "Reading pCAL parameter %d\n", i);
-      for (params[i] = buf; *buf != 0x00 && buf <= endptr; buf++)
+      for (params[i] = buf; buf <= endptr && *buf != 0x00; buf++)
          /* Empty loop to move past each parameter string */ ;
 
       /* Make sure we haven't run out of data yet */
@@ -1733,7 +1743,7 @@ png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    ep = buffer + 1;        /* skip unit byte */
 
 #ifdef PNG_FLOATING_POINT_SUPPORTED
-   width = strtod(ep, &vp);
+   width = png_strtod(png_ptr, ep, &vp);
    if (*vp)
    {
        png_warning(png_ptr, "malformed width string in sCAL chunk");
@@ -1755,8 +1765,19 @@ png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
       /* empty loop */ ;
    ep++;
 
+   if (buffer + slength < ep)
+   {
+       png_warning(png_ptr, "Truncated sCAL chunk");
+#if defined(PNG_FIXED_POINT_SUPPORTED) && \
+    !defined(PNG_FLOATING_POINT_SUPPORTED)
+       png_free(png_ptr, swidth);
+#endif
+      png_free(png_ptr, buffer);
+       return;
+   }
+
 #ifdef PNG_FLOATING_POINT_SUPPORTED
-   height = strtod(ep, &vp);
+   height = png_strtod(png_ptr, ep, &vp);
    if (*vp)
    {
        png_warning(png_ptr, "malformed height string in sCAL chunk");
@@ -1765,7 +1786,7 @@ png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 #else
 #ifdef PNG_FIXED_POINT_SUPPORTED
    sheight = (png_charp)png_malloc_warn(png_ptr, png_strlen(ep) + 1);
-   if (swidth == NULL)
+   if (sheight == NULL)
      {
        png_warning(png_ptr, "Out of memory while processing sCAL chunk height");
        return;
@@ -1978,10 +1999,11 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
       /* empty loop */ ;
 
    /* zTXt must have some text after the chunkdataword */
-   if (text == chunkdata + slength)
+   if (text >= chunkdata + slength - 2)
    {
-      comp_type = PNG_TEXT_COMPRESSION_NONE;
-      png_warning(png_ptr, "Zero length zTXt chunk");
+      png_warning(png_ptr, "Truncated zTXt chunk");
+      png_free(png_ptr, chunkdata);
+      return;
    }
    else
    {
@@ -2081,10 +2103,11 @@ png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
       translated keyword (possibly empty), and possibly some text after the
       keyword */
 
-   if (lang >= chunkdata + slength)
+   if (lang >= chunkdata + slength - 3)
    {
-      comp_flag = PNG_TEXT_COMPRESSION_NONE;
-      png_warning(png_ptr, "Zero length iTXt chunk");
+      png_warning(png_ptr, "Truncated iTXt chunk");
+      png_free(png_ptr, chunkdata);
+      return;
    }
    else
    {
@@ -2096,9 +2119,22 @@ png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
       /* empty loop */ ;
    lang_key++;        /* skip NUL separator */
 
+   if (lang_key >= chunkdata + slength)
+   {
+      png_warning(png_ptr, "Truncated iTXt chunk");
+      png_free(png_ptr, chunkdata);
+      return;
+   }
+
    for (text = lang_key; *text; text++)
       /* empty loop */ ;
    text++;        /* skip NUL separator */
+   if (text >= chunkdata + slength)
+   {
+      png_warning(png_ptr, "Malformed iTXt chunk");
+      png_free(png_ptr, chunkdata);
+      return;
+   }
 
    prefix_len = text - chunkdata;
 
@@ -2148,7 +2184,7 @@ png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    if (png_ptr->mode & PNG_HAVE_IDAT)
    {
 #ifdef PNG_USE_LOCAL_ARRAYS
-      PNG_IDAT;
+      PNG_CONST PNG_IDAT;
 #endif
       if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))  /* not an IDAT */
          png_ptr->mode |= PNG_AFTER_IDAT;
@@ -2170,10 +2206,9 @@ png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    }
 
 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
-   if (png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS)
+   if ((png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS) ||
+       (png_ptr->read_user_chunk_fn != NULL))
    {
-       png_unknown_chunk chunk;
-
 #ifdef PNG_MAX_MALLOC_64K
        if (length > (png_uint_32)65535L)
        {
@@ -2182,30 +2217,42 @@ png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
            length = (png_uint_32)65535L;
        }
 #endif
-       png_strcpy((png_charp)chunk.name, (png_charp)png_ptr->chunk_name);
-       chunk.data = (png_bytep)png_malloc(png_ptr, length);
-       chunk.size = (png_size_t)length;
-       png_crc_read(png_ptr, (png_bytep)chunk.data, length);
+       png_memcpy((png_charp)png_ptr->unknown_chunk.name,
+                  (png_charp)png_ptr->chunk_name, 
+                  png_sizeof(png_ptr->unknown_chunk.name));
+       png_ptr->unknown_chunk.name[png_sizeof(png_ptr->unknown_chunk.name)-1] = '\0';
+       png_ptr->unknown_chunk.size = (png_size_t)length;
+       if (length == 0)
+         png_ptr->unknown_chunk.data = NULL;
+       else
+       {
+         png_ptr->unknown_chunk.data = (png_bytep)png_malloc(png_ptr, length);
+         png_crc_read(png_ptr, (png_bytep)png_ptr->unknown_chunk.data, length);
+       }
 #if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
        if(png_ptr->read_user_chunk_fn != NULL)
        {
           /* callback to user unknown chunk handler */
-          if ((*(png_ptr->read_user_chunk_fn)) (png_ptr, &chunk) <= 0)
+          int ret;
+          ret = (*(png_ptr->read_user_chunk_fn))
+            (png_ptr, &png_ptr->unknown_chunk);
+          if (ret < 0)
+             png_chunk_error(png_ptr, "error in user chunk");
+          if (ret == 0)
           {
              if (!(png_ptr->chunk_name[0] & 0x20))
                 if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
                      PNG_HANDLE_CHUNK_ALWAYS)
-                 {
-                   png_free(png_ptr, chunk.data);
                    png_chunk_error(png_ptr, "unknown critical chunk");
-                 }
-             png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1);
+             png_set_unknown_chunks(png_ptr, info_ptr,
+               &png_ptr->unknown_chunk, 1);
           }
        }
        else
 #endif
-          png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1);
-       png_free(png_ptr, chunk.data);
+       png_set_unknown_chunks(png_ptr, info_ptr, &png_ptr->unknown_chunk, 1);
+       png_free(png_ptr, png_ptr->unknown_chunk.data);
+       png_ptr->unknown_chunk.data = NULL;
    }
    else
 #endif
@@ -2214,8 +2261,7 @@ png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    png_crc_finish(png_ptr, skip);
 
 #if !defined(PNG_READ_USER_CHUNKS_SUPPORTED)
-   if (&info_ptr == NULL) /* quiet compiler warnings about unused info_ptr */
-      return;
+   info_ptr = info_ptr; /* quiet compiler warnings about unused info_ptr */
 #endif
 }
 
@@ -2248,7 +2294,7 @@ png_check_chunk_name(png_structp png_ptr, png_bytep chunk_name)
    a zero indicates the pixel is to be skipped.  This is in addition
    to any alpha or transparency value associated with the pixel.  If
    you want all pixels to be combined, pass 0xff (255) in mask.  */
-#ifndef PNG_HAVE_ASSEMBLER_COMBINE_ROW
+
 void /* PRIVATE */
 png_combine_row(png_structp png_ptr, png_bytep row, int mask)
 {
@@ -2449,10 +2495,8 @@ png_combine_row(png_structp png_ptr, png_bytep row, int mask)
       }
    }
 }
-#endif /* !PNG_HAVE_ASSEMBLER_COMBINE_ROW */
 
 #ifdef PNG_READ_INTERLACING_SUPPORTED
-#ifndef PNG_HAVE_ASSEMBLER_READ_INTERLACE   /* else in pngvcrd.c, pnggccrd.c */
 /* OLD pre-1.0.9 interface:
 void png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
    png_uint_32 transformations)
@@ -2467,10 +2511,10 @@ png_do_read_interlace(png_structp png_ptr)
 #ifdef PNG_USE_LOCAL_ARRAYS
    /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
    /* offset to next interlace block */
-   const int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
+   PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
 #endif
 
-   png_debug(1,"in png_do_read_interlace (stock C version)\n");
+   png_debug(1,"in png_do_read_interlace\n");
    if (row != NULL && row_info != NULL)
    {
       png_uint_32 final_width;
@@ -2674,14 +2718,11 @@ png_do_read_interlace(png_structp png_ptr)
       row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth,final_width);
    }
 #if !defined(PNG_READ_PACKSWAP_SUPPORTED)
-   if (&transformations == NULL) /* silence compiler warning */
-      return;
+   transformations = transformations; /* silence compiler warning */
 #endif
 }
-#endif /* !PNG_HAVE_ASSEMBLER_READ_INTERLACE */
 #endif /* PNG_READ_INTERLACING_SUPPORTED */
 
-#ifndef PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
 void /* PRIVATE */
 png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep row,
    png_bytep prev_row, int filter)
@@ -2804,25 +2845,26 @@ png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep row,
          break;
    }
 }
-#endif /* !PNG_HAVE_ASSEMBLER_READ_FILTER_ROW */
 
 void /* PRIVATE */
 png_read_finish_row(png_structp png_ptr)
 {
 #ifdef PNG_USE_LOCAL_ARRAYS
+#ifdef PNG_READ_INTERLACING_SUPPORTED
    /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
 
    /* start of interlace block */
-   const int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
+   PNG_CONST int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
 
    /* offset to next interlace block */
-   const int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
+   PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
 
    /* start of interlace block in the y direction */
-   const int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
+   PNG_CONST int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
 
    /* offset to next interlace block in the y direction */
-   const int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
+   PNG_CONST int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
+#endif /* PNG_READ_INTERLACING_SUPPORTED */
 #endif
 
    png_debug(1, "in png_read_finish_row\n");
@@ -2830,10 +2872,12 @@ png_read_finish_row(png_structp png_ptr)
    if (png_ptr->row_number < png_ptr->num_rows)
       return;
 
+#ifdef PNG_READ_INTERLACING_SUPPORTED
    if (png_ptr->interlaced)
    {
       png_ptr->row_number = 0;
-      png_memset_check(png_ptr, png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
+      png_memset_check(png_ptr, png_ptr->prev_row, 0,
+         png_ptr->rowbytes + 1);
       do
       {
          png_ptr->pass++;
@@ -2863,11 +2907,12 @@ png_read_finish_row(png_structp png_ptr)
       if (png_ptr->pass < 7)
          return;
    }
+#endif /* PNG_READ_INTERLACING_SUPPORTED */
 
    if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
    {
 #ifdef PNG_USE_LOCAL_ARRAYS
-      PNG_IDAT;
+      PNG_CONST PNG_IDAT;
 #endif
       char extra;
       int ret;
@@ -2888,7 +2933,7 @@ png_read_finish_row(png_structp png_ptr)
                png_ptr->idat_size = png_get_uint_31(png_ptr, chunk_length);
                png_reset_crc(png_ptr);
                png_crc_read(png_ptr, png_ptr->chunk_name, 4);
-               if (png_memcmp(png_ptr->chunk_name, (png_bytep)png_IDAT, 4))
+               if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
                   png_error(png_ptr, "Not enough image data");
 
             }
@@ -2937,19 +2982,21 @@ void /* PRIVATE */
 png_read_start_row(png_structp png_ptr)
 {
 #ifdef PNG_USE_LOCAL_ARRAYS
+#ifdef PNG_READ_INTERLACING_SUPPORTED
    /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
 
    /* start of interlace block */
-   const int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
+   PNG_CONST int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
 
    /* offset to next interlace block */
-   const int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
+   PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
 
    /* start of interlace block in the y direction */
-   const int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
+   PNG_CONST int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
 
    /* offset to next interlace block in the y direction */
-   const int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
+   PNG_CONST int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
+#endif
 #endif
 
    int max_pixel_depth;
@@ -2958,6 +3005,7 @@ png_read_start_row(png_structp png_ptr)
    png_debug(1, "in png_read_start_row\n");
    png_ptr->zstream.avail_in = 0;
    png_init_read_transformations(png_ptr);
+#ifdef PNG_READ_INTERLACING_SUPPORTED
    if (png_ptr->interlaced)
    {
       if (!(png_ptr->transformations & PNG_INTERLACE))
@@ -2978,6 +3026,7 @@ png_read_start_row(png_structp png_ptr)
             png_error(png_ptr, "Rowbytes overflow in png_read_start_row");
    }
    else
+#endif /* PNG_READ_INTERLACING_SUPPORTED */
    {
       png_ptr->num_rows = png_ptr->height;
       png_ptr->iwidth = png_ptr->width;
@@ -3096,20 +3145,29 @@ defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
    if (row_bytes > (png_uint_32)65536L)
       png_error(png_ptr, "This image requires a row greater than 64KB");
 #endif
-   png_ptr->big_row_buf = (png_bytep)png_malloc(png_ptr, row_bytes+64);
-   png_ptr->row_buf = png_ptr->big_row_buf+32;
-#if defined(PNG_DEBUG) && defined(PNG_USE_PNGGCCRD)
-   png_ptr->row_buf_size = row_bytes;
-#endif
+
+   if(row_bytes + 64 > png_ptr->old_big_row_buf_size)
+   {
+     png_free(png_ptr,png_ptr->big_row_buf);
+     png_ptr->big_row_buf = (png_bytep)png_malloc(png_ptr, row_bytes+64);
+     png_ptr->row_buf = png_ptr->big_row_buf+32;
+     png_ptr->old_big_row_buf_size = row_bytes+64;
+   }
 
 #ifdef PNG_MAX_MALLOC_64K
    if ((png_uint_32)png_ptr->rowbytes + 1 > (png_uint_32)65536L)
       png_error(png_ptr, "This image requires a row greater than 64KB");
 #endif
-   if ((png_uint_32)png_ptr->rowbytes + 1 > PNG_SIZE_MAX)
+   if ((png_uint_32)png_ptr->rowbytes > (png_uint_32)(PNG_SIZE_MAX - 1))
       png_error(png_ptr, "Row has too many bytes to allocate in memory.");
-   png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, (png_uint_32)(
-      png_ptr->rowbytes + 1));
+
+   if(png_ptr->rowbytes+1 > png_ptr->old_prev_row_size)
+   {
+     png_free(png_ptr,png_ptr->prev_row);
+     png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, (png_uint_32)(
+        png_ptr->rowbytes + 1));
+     png_ptr->old_prev_row_size = png_ptr->rowbytes+1;
+   }
 
    png_memset_check(png_ptr, png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
 
@@ -3122,3 +3180,4 @@ defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
 
    png_ptr->flags |= PNG_FLAG_ROW_INIT;
 }
+#endif /* PNG_READ_SUPPORTED */

pngset.c

@@ -1,9 +1,9 @@
 
 /* pngset.c - storage of image information into info struct
  *
- * libpng 1.2.8beta1 - November 1, 2004
+ * Last changed in libpng 1.2.27 [April 29, 2008]
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2004 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2008 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
@@ -16,6 +16,8 @@
 #define PNG_INTERNAL
 #include "png.h"
 
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
+
 #if defined(PNG_bKGD_SUPPORTED)
 void PNGAPI
 png_set_bKGD(png_structp png_ptr, png_infop info_ptr, png_color_16p background)
@@ -39,7 +41,13 @@ png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
    png_debug1(1, "in %s storage function\n", "cHRM");
    if (png_ptr == NULL || info_ptr == NULL)
       return;
-
+   if (!(white_x || white_y || red_x || red_y || green_x || green_y ||
+       blue_x || blue_y))
+   {
+      png_warning(png_ptr,
+        "Ignoring attempt to set all-zero chromaticity values");
+      return;
+   }
    if (white_x < 0.0 || white_y < 0.0 ||
          red_x < 0.0 ||   red_y < 0.0 ||
        green_x < 0.0 || green_y < 0.0 ||
@@ -91,6 +99,13 @@ png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
+   if (!(white_x || white_y || red_x || red_y || green_x || green_y ||
+       blue_x || blue_y))
+   {
+      png_warning(png_ptr,
+        "Ignoring attempt to set all-zero chromaticity values");
+      return;
+   }
    if (white_x < 0 || white_y < 0 ||
          red_x < 0 ||   red_y < 0 ||
        green_x < 0 || green_y < 0 ||
@@ -100,14 +115,14 @@ png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
         "Ignoring attempt to set negative chromaticity value");
       return;
    }
-   if (white_x > (double) PNG_UINT_31_MAX ||
-       white_y > (double) PNG_UINT_31_MAX ||
-         red_x > (double) PNG_UINT_31_MAX ||
-         red_y > (double) PNG_UINT_31_MAX ||
-       green_x > (double) PNG_UINT_31_MAX ||
-       green_y > (double) PNG_UINT_31_MAX ||
-        blue_x > (double) PNG_UINT_31_MAX ||
-        blue_y > (double) PNG_UINT_31_MAX)
+   if (white_x > (png_fixed_point) PNG_UINT_31_MAX ||
+       white_y > (png_fixed_point) PNG_UINT_31_MAX ||
+         red_x > (png_fixed_point) PNG_UINT_31_MAX ||
+         red_y > (png_fixed_point) PNG_UINT_31_MAX ||
+       green_x > (png_fixed_point) PNG_UINT_31_MAX ||
+       green_y > (png_fixed_point) PNG_UINT_31_MAX ||
+        blue_x > (png_fixed_point) PNG_UINT_31_MAX ||
+        blue_y > (png_fixed_point) PNG_UINT_31_MAX )
    {
       png_warning(png_ptr,
         "Ignoring attempt to set chromaticity value exceeding 21474.83");
@@ -209,19 +224,21 @@ png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
    png_debug1(1, "in %s storage function\n", "hIST");
    if (png_ptr == NULL || info_ptr == NULL)
       return;
-   if (info_ptr->num_palette == 0)
+   if (info_ptr->num_palette == 0 || info_ptr->num_palette
+       > PNG_MAX_PALETTE_LENGTH)
    {
        png_warning(png_ptr,
-          "Palette size 0, hIST allocation skipped.");
+          "Invalid palette size, hIST allocation skipped.");
        return;
    }
 
 #ifdef PNG_FREE_ME_SUPPORTED
    png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
 #endif
-   /* Changed from info->num_palette to 256 in version 1.2.1 */
+   /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in version
+      1.2.1 */
    png_ptr->hist = (png_uint_16p)png_malloc_warn(png_ptr,
-      (png_uint_32)(256 * png_sizeof (png_uint_16)));
+      (png_uint_32)(PNG_MAX_PALETTE_LENGTH * png_sizeof (png_uint_16)));
    if (png_ptr->hist == NULL)
      {
        png_warning(png_ptr, "Insufficient memory for hIST chunk data.");
@@ -303,13 +320,13 @@ png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
     * 5. The color_type is RGB or RGBA
     */
    if((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&png_ptr->mng_features_permitted)
-      png_warning(png_ptr,"MNG features are not allowed in a PNG datastream\n");
+      png_warning(png_ptr,"MNG features are not allowed in a PNG datastream");
    if(filter_type != PNG_FILTER_TYPE_BASE)
    {
      if(!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
         (filter_type == PNG_INTRAPIXEL_DIFFERENCING) &&
         ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) &&
-        (color_type == PNG_COLOR_TYPE_RGB || 
+        (color_type == PNG_COLOR_TYPE_RGB ||
          color_type == PNG_COLOR_TYPE_RGB_ALPHA)))
         png_error(png_ptr, "Unknown filter method in IHDR");
      if(png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)
@@ -338,7 +355,7 @@ png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
    info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
 
    /* check for potential overflow */
-   if ( width > (PNG_UINT_32_MAX
+   if (width > (PNG_UINT_32_MAX
                  >> 3)      /* 8-byte RGBA pixels */
                  - 64       /* bigrowbuf hack */
                  - 1        /* filter byte */
@@ -469,7 +486,9 @@ png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
    info_ptr->scal_s_width = (png_charp)png_malloc_warn(png_ptr, length);
    if (info_ptr->scal_s_width == NULL)
    {
-      png_warning(png_ptr, "Memory allocation failed while processing sCAL.");
+      png_warning(png_ptr,
+       "Memory allocation failed while processing sCAL.");
+      return;
    }
    png_memcpy(info_ptr->scal_s_width, swidth, (png_size_t)length);
 
@@ -479,10 +498,11 @@ png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
    if (info_ptr->scal_s_height == NULL)
    {
       png_free (png_ptr, info_ptr->scal_s_width);
-      png_warning(png_ptr, "Memory allocation failed while processing sCAL.");
+      png_warning(png_ptr,
+       "Memory allocation failed while processing sCAL.");
+      return;
    }
    png_memcpy(info_ptr->scal_s_height, sheight, (png_size_t)length);
-
    info_ptr->valid |= PNG_INFO_sCAL;
 #ifdef PNG_FREE_ME_SUPPORTED
    info_ptr->free_me |= PNG_FREE_SCAL;
@@ -517,6 +537,17 @@ png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
+   if (num_palette < 0 || num_palette > PNG_MAX_PALETTE_LENGTH)
+     {
+       if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+         png_error(png_ptr, "Invalid palette length");
+       else
+       {
+         png_warning(png_ptr, "Invalid palette length");
+         return;
+       }
+     }
+
    /*
     * It may not actually be necessary to set png_ptr->palette here;
     * we do it for backward compatibility with the way the png_handle_tRNS
@@ -526,11 +557,13 @@ png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
    png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
 #endif
 
-   /* Changed in libpng-1.2.1 to allocate 256 instead of num_palette entries,
+   /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead
+      of num_palette entries,
       in case of an invalid PNG file that has too-large sample values. */
    png_ptr->palette = (png_colorp)png_malloc(png_ptr,
-      256 * png_sizeof(png_color));
-   png_memset(png_ptr->palette, 0, 256 * png_sizeof(png_color));
+      PNG_MAX_PALETTE_LENGTH * png_sizeof(png_color));
+   png_memset(png_ptr->palette, 0, PNG_MAX_PALETTE_LENGTH *
+      png_sizeof(png_color));
    png_memcpy(png_ptr->palette, palette, num_palette * png_sizeof (png_color));
    info_ptr->palette = png_ptr->palette;
    info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
@@ -649,18 +682,20 @@ png_set_iCCP(png_structp png_ptr, png_infop info_ptr,
 {
    png_charp new_iccp_name;
    png_charp new_iccp_profile;
+   png_uint_32 length;
 
    png_debug1(1, "in %s storage function\n", "iCCP");
    if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
       return;
 
-   new_iccp_name = (png_charp)png_malloc_warn(png_ptr, png_strlen(name)+1);
+   length = png_strlen(name)+1;
+   new_iccp_name = (png_charp)png_malloc_warn(png_ptr, length);
    if (new_iccp_name == NULL)
    {
       png_warning(png_ptr, "Insufficient memory to process iCCP chunk.");
       return;
    }
-   png_strcpy(new_iccp_name, name);
+   png_memcpy(new_iccp_name, name, length);
    new_iccp_profile = (png_charp)png_malloc_warn(png_ptr, proflen);
    if (new_iccp_profile == NULL)
    {
@@ -849,7 +884,6 @@ png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
          textp->itxt_length = 0;
 #endif
       }
-      info_ptr->text[info_ptr->num_text]= *textp;
       info_ptr->num_text++;
       png_debug1(3, "transferred text chunk %d\n", info_ptr->num_text);
    }
@@ -880,6 +914,8 @@ png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
+   png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
+
    if (trans != NULL)
    {
        /*
@@ -887,29 +923,41 @@ png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
         * we do it for backward compatibility with the way the png_handle_tRNS
         * function used to do the allocation.
         */
-#ifdef PNG_FREE_ME_SUPPORTED
-       png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
-#endif
-       /* Changed from num_trans to 256 in version 1.2.1 */
+
+       /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */
        png_ptr->trans = info_ptr->trans = (png_bytep)png_malloc(png_ptr,
-           (png_uint_32)256);
-       png_memcpy(info_ptr->trans, trans, (png_size_t)num_trans);
-#ifdef PNG_FREE_ME_SUPPORTED
-       info_ptr->free_me |= PNG_FREE_TRNS;
-#else
-       png_ptr->flags |= PNG_FLAG_FREE_TRNS;
-#endif
+           (png_uint_32)PNG_MAX_PALETTE_LENGTH);
+       if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH)
+         png_memcpy(info_ptr->trans, trans, (png_size_t)num_trans);
    }
 
    if (trans_values != NULL)
    {
+      int sample_max = (1 << info_ptr->bit_depth);
+      if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
+          (int)trans_values->gray > sample_max) ||
+          (info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
+          ((int)trans_values->red > sample_max ||
+          (int)trans_values->green > sample_max ||
+          (int)trans_values->blue > sample_max)))
+        png_warning(png_ptr,
+           "tRNS chunk has out-of-range samples for bit_depth");
       png_memcpy(&(info_ptr->trans_values), trans_values,
          png_sizeof(png_color_16));
       if (num_trans == 0)
         num_trans = 1;
    }
+
    info_ptr->num_trans = (png_uint_16)num_trans;
-   info_ptr->valid |= PNG_INFO_tRNS;
+   if (num_trans != 0)
+   {
+      info_ptr->valid |= PNG_INFO_tRNS;
+#ifdef PNG_FREE_ME_SUPPORTED
+      info_ptr->free_me |= PNG_FREE_TRNS;
+#else
+      png_ptr->flags |= PNG_FLAG_FREE_TRNS;
+#endif
+   }
 }
 #endif
 
@@ -921,6 +969,9 @@ png_set_sPLT(png_structp png_ptr,
     png_sPLT_tp np;
     int i;
 
+    if (png_ptr == NULL || info_ptr == NULL)
+       return;
+
     np = (png_sPLT_tp)png_malloc_warn(png_ptr,
         (info_ptr->splt_palettes_num + nentries) * png_sizeof(png_sPLT_t));
     if (np == NULL)
@@ -938,16 +989,29 @@ png_set_sPLT(png_structp png_ptr,
     {
         png_sPLT_tp to = np + info_ptr->splt_palettes_num + i;
         png_sPLT_tp from = entries + i;
+        png_uint_32 length;
 
-        to->name = (png_charp)png_malloc(png_ptr,
-            png_strlen(from->name) + 1);
-        /* TODO: use png_malloc_warn */
-        png_strcpy(to->name, from->name);
-        to->entries = (png_sPLT_entryp)png_malloc(png_ptr,
-            from->nentries * png_sizeof(png_sPLT_t));
-        /* TODO: use png_malloc_warn */
+        length = png_strlen(from->name) + 1;
+        to->name = (png_charp)png_malloc_warn(png_ptr, length);
+        if (to->name == NULL)
+        {
+           png_warning(png_ptr,
+             "Out of memory while processing sPLT chunk");
+           continue;
+        }
+        png_memcpy(to->name, from->name, length);
+        to->entries = (png_sPLT_entryp)png_malloc_warn(png_ptr,
+            from->nentries * png_sizeof(png_sPLT_entry));
+        if (to->entries == NULL)
+        {
+           png_warning(png_ptr,
+             "Out of memory while processing sPLT chunk");
+           png_free(png_ptr,to->name);
+           to->name = NULL;
+           continue;
+        }
         png_memcpy(to->entries, from->entries,
-            from->nentries * png_sizeof(png_sPLT_t));
+            from->nentries * png_sizeof(png_sPLT_entry));
         to->nentries = from->nentries;
         to->depth = from->depth;
     }
@@ -977,7 +1041,8 @@ png_set_unknown_chunks(png_structp png_ptr,
         png_sizeof(png_unknown_chunk));
     if (np == NULL)
     {
-       png_warning(png_ptr, "Out of memory while processing unknown chunk.");
+       png_warning(png_ptr,
+          "Out of memory while processing unknown chunk.");
        return;
     }
 
@@ -988,23 +1053,31 @@ png_set_unknown_chunks(png_structp png_ptr,
 
     for (i = 0; i < num_unknowns; i++)
     {
-        png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;
-        png_unknown_chunkp from = unknowns + i;
+       png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;
+       png_unknown_chunkp from = unknowns + i;
 
-        png_strncpy((png_charp)to->name, (png_charp)from->name, 5);
-        to->data = (png_bytep)png_malloc_warn(png_ptr, from->size);
-        if (to->data == NULL)
-        {
-           png_warning(png_ptr, "Out of memory processing unknown chunk.");
-        }
-        else
-        {
-           png_memcpy(to->data, from->data, from->size);
-           to->size = from->size;
+       png_memcpy((png_charp)to->name, 
+                  (png_charp)from->name, 
+                  png_sizeof(from->name));
+       to->name[png_sizeof(to->name)-1] = '\0';
+       to->size = from->size;
+       /* note our location in the read or write sequence */
+       to->location = (png_byte)(png_ptr->mode & 0xff);
 
-           /* note our location in the read or write sequence */
-           to->location = (png_byte)(png_ptr->mode & 0xff);
-        }
+       if (from->size == 0)
+          to->data=NULL;
+       else
+       {
+          to->data = (png_bytep)png_malloc_warn(png_ptr, from->size);
+          if (to->data == NULL)
+          {
+             png_warning(png_ptr,
+              "Out of memory while processing unknown chunk.");
+             to->size=0;
+          }
+          else
+             png_memcpy(to->data, from->data, from->size);
+       }
     }
 
     info_ptr->unknown_chunks = np;
@@ -1023,21 +1096,23 @@ png_set_unknown_chunk_location(png_structp png_ptr, png_infop info_ptr,
 }
 #endif
 
+#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
     defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
 void PNGAPI
 png_permit_empty_plte (png_structp png_ptr, int empty_plte_permitted)
 {
    /* This function is deprecated in favor of png_permit_mng_features()
-      and will be removed from libpng-2.0.0 */
+      and will be removed from libpng-1.3.0 */
    png_debug(1, "in png_permit_empty_plte, DEPRECATED.\n");
    if (png_ptr == NULL)
       return;
    png_ptr->mng_features_permitted = (png_byte)
-     ((png_ptr->mng_features_permitted & (~(PNG_FLAG_MNG_EMPTY_PLTE))) |
+     ((png_ptr->mng_features_permitted & (~PNG_FLAG_MNG_EMPTY_PLTE)) |
      ((empty_plte_permitted & PNG_FLAG_MNG_EMPTY_PLTE)));
 }
 #endif
+#endif
 
 #if defined(PNG_MNG_FEATURES_SUPPORTED)
 png_uint_32 PNGAPI
@@ -1059,6 +1134,8 @@ png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_bytep
 {
     png_bytep new_list, p;
     int i, old_num_chunks;
+    if (png_ptr == NULL)
+       return;
     if (num_chunks == 0)
     {
       if(keep == PNG_HANDLE_CHUNK_ALWAYS || keep == PNG_HANDLE_CHUNK_IF_SAFE)
@@ -1102,6 +1179,8 @@ png_set_read_user_chunk_fn(png_structp png_ptr, png_voidp user_chunk_ptr,
    png_user_chunk_ptr read_user_chunk_fn)
 {
    png_debug(1, "in png_set_read_user_chunk_fn\n");
+   if (png_ptr == NULL)
+      return;
    png_ptr->read_user_chunk_fn = read_user_chunk_fn;
    png_ptr->user_chunk_ptr = user_chunk_ptr;
 }
@@ -1128,8 +1207,9 @@ png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers)
 void PNGAPI
 png_set_compression_buffer_size(png_structp png_ptr, png_uint_32 size)
 {
-    if(png_ptr->zbuf)
-       png_free(png_ptr, png_ptr->zbuf);
+    if (png_ptr == NULL)
+       return;
+    png_free(png_ptr, png_ptr->zbuf);
     png_ptr->zbuf_size = (png_size_t)size;
     png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, size);
     png_ptr->zstream.next_out = png_ptr->zbuf;
@@ -1141,63 +1221,30 @@ void PNGAPI
 png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask)
 {
    if (png_ptr && info_ptr)
-      info_ptr->valid &= ~(mask);
+      info_ptr->valid &= ~mask;
 }
 
 
 #ifndef PNG_1_0_X
 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED
-/* this function was added to libpng 1.2.0 and should always exist by default */
+/* function was added to libpng 1.2.0 and should always exist by default */
 void PNGAPI
 png_set_asm_flags (png_structp png_ptr, png_uint_32 asm_flags)
 {
-    png_uint_32 settable_asm_flags;
-    png_uint_32 settable_mmx_flags;
-
-    settable_mmx_flags =
-#ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
-                         PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  |
-#endif
-#ifdef PNG_HAVE_ASSEMBLER_READ_INTERLACE
-                         PNG_ASM_FLAG_MMX_READ_INTERLACE    |
-#endif
-#ifdef PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
-                         PNG_ASM_FLAG_MMX_READ_FILTER_SUB   |
-                         PNG_ASM_FLAG_MMX_READ_FILTER_UP    |
-                         PNG_ASM_FLAG_MMX_READ_FILTER_AVG   |
-                         PNG_ASM_FLAG_MMX_READ_FILTER_PAETH |
-#endif
-                         0;
-
-    /* could be some non-MMX ones in the future, but not currently: */
-    settable_asm_flags = settable_mmx_flags;
-
-    if (!(png_ptr->asm_flags & PNG_ASM_FLAG_MMX_SUPPORT_COMPILED) ||
-        !(png_ptr->asm_flags & PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU))
-    {
-        /* clear all MMX flags if MMX isn't supported */
-        settable_asm_flags &= ~settable_mmx_flags;
-        png_ptr->asm_flags &= ~settable_mmx_flags;
-    }
-
-    /* we're replacing the settable bits with those passed in by the user,
-     * so first zero them out of the master copy, then logical-OR in the
-     * allowed subset that was requested */
-
-    png_ptr->asm_flags &= ~settable_asm_flags;               /* zero them */
-    png_ptr->asm_flags |= (asm_flags & settable_asm_flags);  /* set them */
+/* Obsolete as of libpng-1.2.20 and will be removed from libpng-1.4.0 */
+    if (png_ptr != NULL)
+    png_ptr->asm_flags = 0;
 }
-#endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
 
-#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
 /* this function was added to libpng 1.2.0 */
 void PNGAPI
 png_set_mmx_thresholds (png_structp png_ptr,
                         png_byte mmx_bitdepth_threshold,
                         png_uint_32 mmx_rowbytes_threshold)
 {
-    png_ptr->mmx_bitdepth_threshold = mmx_bitdepth_threshold;
-    png_ptr->mmx_rowbytes_threshold = mmx_rowbytes_threshold;
+/* Obsolete as of libpng-1.2.20 and will be removed from libpng-1.4.0 */
+    if (png_ptr == NULL)
+       return;
 }
 #endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
 
@@ -1211,9 +1258,11 @@ png_set_user_limits (png_structp png_ptr, png_uint_32 user_width_max,
      * rejected by png_set_IHDR().  To accept any PNG datastream
      * regardless of dimensions, set both limits to 0x7ffffffL.
      */
+    if(png_ptr == NULL) return;
     png_ptr->user_width_max = user_width_max;
     png_ptr->user_height_max = user_height_max;
 }
 #endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
 
 #endif /* ?PNG_1_0_X */
+#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */

pngtest.c

@@ -1,9 +1,9 @@
 
 /* pngtest.c - a simple test program to test libpng
  *
- * libpng 1.2.8beta1 - November 1, 2004
+ * Last changed in libpng 1.2.27 - [April 29, 2008]
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2004 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2008 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
@@ -44,7 +44,6 @@
 #else
 #  include <stdio.h>
 #  include <stdlib.h>
-#  include <assert.h>
 #  define READFILE(file, data, length, check) \
      check=(png_size_t)fread(data,(png_size_t)1,length,file)
 #  define WRITEFILE(file, data, length, check) \
@@ -82,21 +81,10 @@ static float t_start, t_stop, t_decode, t_encode, t_misc;
 #include <time.h>
 #endif
 
-/* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */
-#ifndef png_jmpbuf
-#  define png_jmpbuf(png_ptr) png_ptr->jmpbuf
-#endif
-
-#ifdef PNGTEST_TIMING
-static float t_start, t_stop, t_decode, t_encode, t_misc;
-#if !defined(PNG_tIME_SUPPORTED)
-#include <time.h>
-#endif
-#endif
-
 #if defined(PNG_TIME_RFC1123_SUPPORTED)
+#define PNG_tIME_STRING_LENGTH 30
 static int tIME_chunk_present=0;
-static char tIME_string[30] = "no tIME chunk present in file";
+static char tIME_string[PNG_tIME_STRING_LENGTH] = "no tIME chunk present in file";
 #endif
 
 static int verbose = 0;
@@ -116,6 +104,16 @@ static int status_pass=1;
 static int status_dots_requested=0;
 static int status_dots=1;
 
+/* In case a system header (e.g., on AIX) defined jmpbuf */
+#ifdef jmpbuf
+#  undef jmpbuf
+#endif
+
+/* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */
+#ifndef png_jmpbuf
+#  define png_jmpbuf(png_ptr) png_ptr->jmpbuf
+#endif
+
 void
 #ifdef PNG_1_0_X
 PNGAPI
@@ -437,8 +435,9 @@ pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
       png_error(png_ptr, "Write Error");
    }
 }
-
 #endif /* USE_FAR_KEYWORD */
+#endif /* PNG_NO_STDIO */
+/* END of code to validate stdio-free compilation */
 
 /* This function is called when there is a warning, but the library thinks
  * it can continue anyway.  Replacement functions don't have to do anything
@@ -466,8 +465,6 @@ pngtest_error(png_structp png_ptr, png_const_charp message)
    /* We can return because png_error calls the default handler, which is
     * actually OK in this case. */
 }
-#endif /* PNG_NO_STDIO */
-/* END of code to validate stdio-free compilation */
 
 /* START of code to validate memory allocation and deallocation */
 #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
@@ -537,8 +534,8 @@ png_debug_malloc(png_structp png_ptr, png_uint_32 size)
       /* Make sure the caller isn't assuming zeroed memory. */
       png_memset(pinfo->pointer, 0xdd, pinfo->size);
       if(verbose)
-         printf("png_malloc %lu bytes at %x\n",size,pinfo->pointer);
-      assert(pinfo->size != 12345678);
+         printf("png_malloc %lu bytes at %x\n",(unsigned long)size,
+          pinfo->pointer);
       return (png_voidp)(pinfo->pointer);
    }
 }
@@ -661,10 +658,8 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
    read_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, png_voidp_NULL,
       png_error_ptr_NULL, png_error_ptr_NULL);
 #endif
-#if defined(PNG_NO_STDIO)
    png_set_error_fn(read_ptr, (png_voidp)inname, pngtest_error,
        pngtest_warning);
-#endif
 #ifdef PNG_WRITE_SUPPORTED
 #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
    write_ptr = png_create_write_struct_2(PNG_LIBPNG_VER_STRING, png_voidp_NULL,
@@ -674,10 +669,8 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
    write_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, png_voidp_NULL,
       png_error_ptr_NULL, png_error_ptr_NULL);
 #endif
-#if defined(PNG_NO_STDIO)
    png_set_error_fn(write_ptr, (png_voidp)inname, pngtest_error,
        pngtest_warning);
-#endif
 #endif
    png_debug(0, "Allocating read_info, write_info and end_info structures\n");
    read_info_ptr = png_create_info_struct(read_ptr);
@@ -696,8 +689,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #endif
    {
       fprintf(STDERR, "%s -> %s: libpng read error\n", inname, outname);
-      if (row_buf)
-         png_free(read_ptr, row_buf);
+      png_free(read_ptr, row_buf);
       png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
 #ifdef PNG_WRITE_SUPPORTED
       png_destroy_info_struct(write_ptr, &write_end_info_ptr);
@@ -1010,10 +1002,13 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
       {
          png_set_tIME(write_ptr, write_info_ptr, mod_time);
 #if defined(PNG_TIME_RFC1123_SUPPORTED)
-         /* we have to use png_strcpy instead of "=" because the string
+         /* we have to use png_memcpy instead of "=" because the string
             pointed to by png_convert_to_rfc1123() gets free'ed before
             we use it */
-         png_strcpy(tIME_string,png_convert_to_rfc1123(read_ptr, mod_time));
+         png_memcpy(tIME_string,
+                    png_convert_to_rfc1123(read_ptr, mod_time), 
+                    png_sizeof(tIME_string));
+         tIME_string[png_sizeof(tIME_string)-1] = '\0';
          tIME_chunk_present++;
 #endif /* PNG_TIME_RFC1123_SUPPORTED */
       }
@@ -1028,8 +1023,16 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
       if (png_get_tRNS(read_ptr, read_info_ptr, &trans, &num_trans,
          &trans_values))
       {
-         png_set_tRNS(write_ptr, write_info_ptr, trans, num_trans,
-            trans_values);
+         int sample_max = (1 << read_info_ptr->bit_depth);
+         /* libpng doesn't reject a tRNS chunk with out-of-range samples */
+         if (!((read_info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
+            (int)trans_values->gray > sample_max) ||
+            (read_info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
+            ((int)trans_values->red > sample_max ||
+            (int)trans_values->green > sample_max ||
+            (int)trans_values->blue > sample_max))))
+           png_set_tRNS(write_ptr, write_info_ptr, trans, num_trans,
+              trans_values);
       }
    }
 #endif
@@ -1150,10 +1153,13 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
       {
          png_set_tIME(write_ptr, write_end_info_ptr, mod_time);
 #if defined(PNG_TIME_RFC1123_SUPPORTED)
-         /* we have to use png_strcpy instead of "=" because the string
+         /* we have to use png_memcpy instead of "=" because the string
             pointed to by png_convert_to_rfc1123() gets free'ed before
             we use it */
-         png_strcpy(tIME_string,png_convert_to_rfc1123(read_ptr, mod_time));
+         png_memcpy(tIME_string,
+                    png_convert_to_rfc1123(read_ptr, mod_time),
+                    png_sizeof(tIME_string));
+         tIME_string[png_sizeof(tIME_string)-1] = '\0';
          tIME_chunk_present++;
 #endif /* PNG_TIME_RFC1123_SUPPORTED */
       }
@@ -1190,7 +1196,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
       iwidth = png_get_image_width(write_ptr, write_info_ptr);
       iheight = png_get_image_height(write_ptr, write_info_ptr);
       fprintf(STDERR, "Image width = %lu, height = %lu\n",
-         iwidth, iheight);
+         (unsigned long)iwidth, (unsigned long)iheight);
    }
 #endif
 
@@ -1314,7 +1320,8 @@ main(int argc, char *argv[])
    fprintf(STDERR, "   with zlib   version %s\n", ZLIB_VERSION);
    fprintf(STDERR,"%s",png_get_copyright(NULL));
    /* Show the version of libpng used in building the library */
-   fprintf(STDERR," library (%lu):%s", png_access_version_number(),
+   fprintf(STDERR," library (%lu):%s",
+      (unsigned long)png_access_version_number(),
       png_get_header_version(NULL));
    /* Show the version of libpng used in building the application */
    fprintf(STDERR," pngtest (%lu):%s", (unsigned long)PNG_LIBPNG_VER,
@@ -1402,7 +1409,8 @@ main(int argc, char *argv[])
          if (kerror == 0)
          {
 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
-            fprintf(STDERR, "\n PASS (%lu zero samples)\n",zero_samples);
+            fprintf(STDERR, "\n PASS (%lu zero samples)\n",
+               (unsigned long)zero_samples);
 #else
             fprintf(STDERR, " PASS\n");
 #endif
@@ -1410,7 +1418,7 @@ main(int argc, char *argv[])
             for (k=0; k<256; k++)
                if(filters_used[k])
                   fprintf(STDERR, " Filter %d was used %lu times\n",
-                     k,filters_used[k]);
+                     k,(unsigned long)filters_used[k]);
 #endif
 #if defined(PNG_TIME_RFC1123_SUPPORTED)
          if(tIME_chunk_present != 0)
@@ -1435,7 +1443,7 @@ main(int argc, char *argv[])
                current_allocation);
             while (pinfo != NULL)
             {
-               fprintf(STDERR, " %lu bytes at %x\n", pinfo->size, 
+               fprintf(STDERR, " %lu bytes at %x\n", (unsigned long)pinfo->size,
                  (unsigned int) pinfo->pointer);
                pinfo = pinfo->next;
             }
@@ -1475,7 +1483,8 @@ main(int argc, char *argv[])
                 int k;
 #endif
 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
-                fprintf(STDERR, "\n PASS (%lu zero samples)\n",zero_samples);
+                fprintf(STDERR, "\n PASS (%lu zero samples)\n",
+                   (unsigned long)zero_samples);
 #else
                 fprintf(STDERR, " PASS\n");
 #endif
@@ -1483,7 +1492,7 @@ main(int argc, char *argv[])
                 for (k=0; k<256; k++)
                    if(filters_used[k])
                       fprintf(STDERR, " Filter %d was used %lu times\n",
-                         k,filters_used[k]);
+                         k,(unsigned long)filters_used[k]);
 #endif
 #if defined(PNG_TIME_RFC1123_SUPPORTED)
              if(tIME_chunk_present != 0)
@@ -1511,7 +1520,7 @@ main(int argc, char *argv[])
              while (pinfo != NULL)
              {
                 fprintf(STDERR," %lu bytes at %x\n",
-                   pinfo->size, (unsigned int)pinfo->pointer);
+                   (unsigned long)pinfo->size, (unsigned int)pinfo->pointer);
                 pinfo = pinfo->next;
              }
           }
@@ -1551,4 +1560,4 @@ main(int argc, char *argv[])
 }
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_2_8beta1 your_png_h_is_not_version_1_2_8beta1;
+typedef version_1_0_37 your_png_h_is_not_version_1_0_37;

pngtrans.c

@@ -1,9 +1,9 @@
 
 /* pngtrans.c - transforms the data in a row (used by both readers and writers)
  *
- * libpng  1.2.8beta1 - November 1, 2004
+ * Last changed in libpng 1.2.17 May 15, 2007
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2004 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2007 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  */
@@ -11,12 +11,14 @@
 #define PNG_INTERNAL
 #include "png.h"
 
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
 /* turn on BGR-to-RGB mapping */
 void PNGAPI
 png_set_bgr(png_structp png_ptr)
 {
    png_debug(1, "in png_set_bgr\n");
+   if(png_ptr == NULL) return;
    png_ptr->transformations |= PNG_BGR;
 }
 #endif
@@ -27,6 +29,7 @@ void PNGAPI
 png_set_swap(png_structp png_ptr)
 {
    png_debug(1, "in png_set_swap\n");
+   if(png_ptr == NULL) return;
    if (png_ptr->bit_depth == 16)
       png_ptr->transformations |= PNG_SWAP_BYTES;
 }
@@ -38,6 +41,7 @@ void PNGAPI
 png_set_packing(png_structp png_ptr)
 {
    png_debug(1, "in png_set_packing\n");
+   if(png_ptr == NULL) return;
    if (png_ptr->bit_depth < 8)
    {
       png_ptr->transformations |= PNG_PACK;
@@ -52,6 +56,7 @@ void PNGAPI
 png_set_packswap(png_structp png_ptr)
 {
    png_debug(1, "in png_set_packswap\n");
+   if(png_ptr == NULL) return;
    if (png_ptr->bit_depth < 8)
       png_ptr->transformations |= PNG_PACKSWAP;
 }
@@ -62,6 +67,7 @@ void PNGAPI
 png_set_shift(png_structp png_ptr, png_color_8p true_bits)
 {
    png_debug(1, "in png_set_shift\n");
+   if(png_ptr == NULL) return;
    png_ptr->transformations |= PNG_SHIFT;
    png_ptr->shift = *true_bits;
 }
@@ -73,7 +79,7 @@ int PNGAPI
 png_set_interlace_handling(png_structp png_ptr)
 {
    png_debug(1, "in png_set_interlace handling\n");
-   if (png_ptr->interlaced)
+   if (png_ptr && png_ptr->interlaced)
    {
       png_ptr->transformations |= PNG_INTERLACE;
       return (7);
@@ -93,6 +99,7 @@ void PNGAPI
 png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc)
 {
    png_debug(1, "in png_set_filler\n");
+   if(png_ptr == NULL) return;
    png_ptr->transformations |= PNG_FILLER;
    png_ptr->filler = (png_byte)filler;
    if (filler_loc == PNG_FILLER_AFTER)
@@ -125,6 +132,7 @@ void PNGAPI
 png_set_add_alpha(png_structp png_ptr, png_uint_32 filler, int filler_loc)
 {
    png_debug(1, "in png_set_add_alpha\n");
+   if(png_ptr == NULL) return;
    png_set_filler(png_ptr, filler, filler_loc);
    png_ptr->transformations |= PNG_ADD_ALPHA;
 }
@@ -138,6 +146,7 @@ void PNGAPI
 png_set_swap_alpha(png_structp png_ptr)
 {
    png_debug(1, "in png_set_swap_alpha\n");
+   if(png_ptr == NULL) return;
    png_ptr->transformations |= PNG_SWAP_ALPHA;
 }
 #endif
@@ -148,6 +157,7 @@ void PNGAPI
 png_set_invert_alpha(png_structp png_ptr)
 {
    png_debug(1, "in png_set_invert_alpha\n");
+   if(png_ptr == NULL) return;
    png_ptr->transformations |= PNG_INVERT_ALPHA;
 }
 #endif
@@ -157,6 +167,7 @@ void PNGAPI
 png_set_invert_mono(png_structp png_ptr)
 {
    png_debug(1, "in png_set_invert_mono\n");
+   if(png_ptr == NULL) return;
    png_ptr->transformations |= PNG_INVERT_MONO;
 }
 
@@ -241,7 +252,7 @@ png_do_swap(png_row_infop row_info, png_bytep row)
 #endif
 
 #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED)
-static png_byte onebppswaptable[256] = {
+static PNG_CONST png_byte onebppswaptable[256] = {
    0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0,
    0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,
    0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8,
@@ -276,7 +287,7 @@ static png_byte onebppswaptable[256] = {
    0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF
 };
 
-static png_byte twobppswaptable[256] = {
+static PNG_CONST png_byte twobppswaptable[256] = {
    0x00, 0x40, 0x80, 0xC0, 0x10, 0x50, 0x90, 0xD0,
    0x20, 0x60, 0xA0, 0xE0, 0x30, 0x70, 0xB0, 0xF0,
    0x04, 0x44, 0x84, 0xC4, 0x14, 0x54, 0x94, 0xD4,
@@ -311,7 +322,7 @@ static png_byte twobppswaptable[256] = {
    0x2F, 0x6F, 0xAF, 0xEF, 0x3F, 0x7F, 0xBF, 0xFF
 };
 
-static png_byte fourbppswaptable[256] = {
+static PNG_CONST png_byte fourbppswaptable[256] = {
    0x00, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70,
    0x80, 0x90, 0xA0, 0xB0, 0xC0, 0xD0, 0xE0, 0xF0,
    0x01, 0x11, 0x21, 0x31, 0x41, 0x51, 0x61, 0x71,
@@ -362,11 +373,11 @@ png_do_packswap(png_row_infop row_info, png_bytep row)
       end = row + row_info->rowbytes;
 
       if (row_info->bit_depth == 1)
-         table = onebppswaptable;
+         table = (png_bytep)onebppswaptable;
       else if (row_info->bit_depth == 2)
-         table = twobppswaptable;
+         table = (png_bytep)twobppswaptable;
       else if (row_info->bit_depth == 4)
-         table = fourbppswaptable;
+         table = (png_bytep)fourbppswaptable;
       else
          return;
 
@@ -380,8 +391,7 @@ png_do_packswap(png_row_infop row_info, png_bytep row)
     defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
 /* remove filler or alpha byte(s) */
 void /* PRIVATE */
-png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags,
-  png_uint_32 transformations)
+png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
 {
    png_debug(1, "in png_do_strip_filler\n");
 #if defined(PNG_USELESS_TESTS_SUPPORTED)
@@ -394,8 +404,8 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags,
       png_uint_32 i;
 
       if ((row_info->color_type == PNG_COLOR_TYPE_RGB ||
-         (row_info->color_type == PNG_COLOR_TYPE_RGBA &&
-         (transformations & PNG_STRIP_ALPHA))) &&
+         (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA &&
+         (flags & PNG_FLAG_STRIP_ALPHA))) &&
          row_info->channels == 4)
       {
          if (row_info->bit_depth == 8)
@@ -474,9 +484,9 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags,
          }
          row_info->channels = 3;
       }
-      else if ((row_info->color_type == PNG_COLOR_TYPE_GRAY &&
+      else if ((row_info->color_type == PNG_COLOR_TYPE_GRAY ||
          (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
-         (transformations & PNG_STRIP_ALPHA))) &&
+         (flags & PNG_FLAG_STRIP_ALPHA))) &&
           row_info->channels == 2)
       {
          if (row_info->bit_depth == 8)
@@ -530,6 +540,8 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags,
          }
          row_info->channels = 1;
       }
+      if (flags & PNG_FLAG_STRIP_ALPHA)
+        row_info->color_type &= ~PNG_COLOR_MASK_ALPHA;
    }
 }
 #endif
@@ -619,6 +631,7 @@ png_set_user_transform_info(png_structp png_ptr, png_voidp
    user_transform_ptr, int user_transform_depth, int user_transform_channels)
 {
    png_debug(1, "in png_set_user_transform_info\n");
+   if(png_ptr == NULL) return;
 #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
    png_ptr->user_transform_ptr = user_transform_ptr;
    png_ptr->user_transform_depth = (png_byte)user_transform_depth;
@@ -640,10 +653,10 @@ png_voidp PNGAPI
 png_get_user_transform_ptr(png_structp png_ptr)
 {
 #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
+   if (png_ptr == NULL) return (NULL);
    return ((png_voidp)png_ptr->user_transform_ptr);
 #else
-   if(png_ptr)
-     return (NULL);
    return (NULL);
 #endif
 }
+#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */

pngwio.c

@@ -1,9 +1,9 @@
 
 /* pngwio.c - functions for data output
  *
- * libpng 1.2.8beta1 - November 1, 2004
+ * Last changed in libpng 1.2.13 November 13, 2006
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2004 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2006 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
@@ -45,6 +45,7 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    png_uint_32 check;
 
+   if(png_ptr == NULL) return;
 #if defined(_WIN32_WCE)
    if ( !WriteFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) )
       check = 0;
@@ -70,6 +71,7 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
    png_byte *near_data;  /* Needs to be "png_byte *" instead of "png_bytep" */
    png_FILE_p io_ptr;
 
+   if(png_ptr == NULL) return;
    /* Check if data really is near. If so, use usual code. */
    near_data = (png_byte *)CVT_PTR_NOCHECK(data);
    io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
@@ -131,6 +133,9 @@ png_default_flush(png_structp png_ptr)
 {
 #if !defined(_WIN32_WCE)
    png_FILE_p io_ptr;
+#endif
+   if(png_ptr == NULL) return;
+#if !defined(_WIN32_WCE)
    io_ptr = (png_FILE_p)CVT_PTR((png_ptr->io_ptr));
    if (io_ptr != NULL)
       fflush(io_ptr);
@@ -165,6 +170,7 @@ void PNGAPI
 png_set_write_fn(png_structp png_ptr, png_voidp io_ptr,
    png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)
 {
+   if(png_ptr == NULL) return;
    png_ptr->io_ptr = io_ptr;
 
 #if !defined(PNG_NO_STDIO)

pngwrite.c

@@ -1,9 +1,9 @@
 
 /* pngwrite.c - general routines to write a PNG file
  *
- * libpng 1.2.8beta1 - November 1, 2004
+ * Last changed in libpng 1.2.27 [April 29, 2008]
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2004 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2008 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  */
@@ -26,13 +26,15 @@ void PNGAPI
 png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
 {
    png_debug(1, "in png_write_info_before_PLTE\n");
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
    if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
    {
    png_write_sig(png_ptr); /* write PNG signature */
 #if defined(PNG_MNG_FEATURES_SUPPORTED)
    if((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&(png_ptr->mng_features_permitted))
    {
-      png_warning(png_ptr,"MNG features are not allowed in a PNG datastream\n");
+      png_warning(png_ptr,"MNG features are not allowed in a PNG datastream");
       png_ptr->mng_features_permitted=0;
    }
 #endif
@@ -110,6 +112,8 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
             ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
             (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
          {
+            if (up->size == 0)
+               png_warning(png_ptr, "Writing zero-length unknown chunk");
             png_write_chunk(png_ptr, up->name, up->data, up->size);
          }
        }
@@ -128,13 +132,16 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
 
    png_debug(1, "in png_write_info\n");
 
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
    png_write_info_before_PLTE(png_ptr, info_ptr);
 
    if (info_ptr->valid & PNG_INFO_PLTE)
       png_write_PLTE(png_ptr, info_ptr->palette,
          (png_uint_32)info_ptr->num_palette);
    else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
-      png_error(png_ptr, "Valid palette required for paletted images\n");
+      png_error(png_ptr, "Valid palette required for paletted images");
 
 #if defined(PNG_WRITE_tRNS_SUPPORTED)
    if (info_ptr->valid & PNG_INFO_tRNS)
@@ -183,7 +190,7 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
           info_ptr->scal_s_width, info_ptr->scal_s_height);
 #else
       png_warning(png_ptr,
-          "png_write_sCAL not supported; sCAL chunk not written.\n");
+          "png_write_sCAL not supported; sCAL chunk not written.");
 #endif
 #endif
 #endif
@@ -222,7 +229,7 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
                          info_ptr->text[i].lang_key,
                          info_ptr->text[i].text);
 #else
-          png_warning(png_ptr, "Unable to write international text\n");
+          png_warning(png_ptr, "Unable to write international text");
 #endif
           /* Mark this chunk as written */
           info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
@@ -236,7 +243,7 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
             info_ptr->text[i].text, 0,
             info_ptr->text[i].compression);
 #else
-         png_warning(png_ptr, "Unable to write compressed text\n");
+         png_warning(png_ptr, "Unable to write compressed text");
 #endif
          /* Mark this chunk as written */
          info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
@@ -249,7 +256,7 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
                          info_ptr->text[i].text,
                          0);
 #else
-         png_warning(png_ptr, "Unable to write uncompressed text\n");
+         png_warning(png_ptr, "Unable to write uncompressed text");
 #endif
          /* Mark this chunk as written */
          info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
@@ -290,6 +297,8 @@ void PNGAPI
 png_write_end(png_structp png_ptr, png_infop info_ptr)
 {
    png_debug(1, "in png_write_end\n");
+   if (png_ptr == NULL)
+      return;
    if (!(png_ptr->mode & PNG_HAVE_IDAT))
       png_error(png_ptr, "No IDATs written into file");
 
@@ -323,7 +332,7 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
                          info_ptr->text[i].lang_key,
                          info_ptr->text[i].text);
 #else
-             png_warning(png_ptr, "Unable to write international text\n");
+             png_warning(png_ptr, "Unable to write international text");
 #endif
              /* Mark this chunk as written */
              info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
@@ -336,7 +345,7 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
                info_ptr->text[i].text, 0,
                info_ptr->text[i].compression);
 #else
-            png_warning(png_ptr, "Unable to write compressed text\n");
+            png_warning(png_ptr, "Unable to write compressed text");
 #endif
             /* Mark this chunk as written */
             info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
@@ -348,7 +357,7 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
             png_write_tEXt(png_ptr, info_ptr->text[i].key,
                info_ptr->text[i].text, 0);
 #else
-            png_warning(png_ptr, "Unable to write uncompressed text\n");
+            png_warning(png_ptr, "Unable to write uncompressed text");
 #endif
 
             /* Mark this chunk as written */
@@ -384,11 +393,6 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
 
    /* write end of PNG file */
    png_write_IEND(png_ptr);
-#if 0
-/* This flush, added in libpng-1.0.8,  causes some applications to crash
-   because they do not set png_ptr->output_flush_fn */
-   png_flush(png_ptr);
-#endif
 }
 
 #if defined(PNG_WRITE_tIME_SUPPORTED)
@@ -452,12 +456,6 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
    if (png_ptr == NULL)
       return (NULL);
 
-#if !defined(PNG_1_0_X)
-#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
-   png_init_mmx_flags(png_ptr);   /* 1.2.0 addition */
-#endif
-#endif /* PNG_1_0_X */
-
    /* added at libpng-1.2.6 */
 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
    png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
@@ -486,12 +484,15 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
 #endif /* PNG_USER_MEM_SUPPORTED */
    png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
 
-   i=0;
-   do
+   if(user_png_ver)
    {
-     if(user_png_ver[i] != png_libpng_ver[i])
-        png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
-   } while (png_libpng_ver[i++]);
+     i=0;
+     do
+     {
+       if(user_png_ver[i] != png_libpng_ver[i])
+          png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+     } while (png_libpng_ver[i++]);
+   }
 
    if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
    {
@@ -508,11 +509,13 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
         char msg[80];
         if (user_png_ver)
         {
-          sprintf(msg, "Application was compiled with png.h from libpng-%.20s",
+          png_snprintf(msg, 80,
+             "Application was compiled with png.h from libpng-%.20s",
              user_png_ver);
           png_warning(png_ptr, msg);
         }
-        sprintf(msg, "Application  is  running with png.c from libpng-%.20s",
+        png_snprintf(msg, 80,
+           "Application  is  running with png.c from libpng-%.20s",
            png_libpng_ver);
         png_warning(png_ptr, msg);
 #endif
@@ -554,6 +557,8 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
 }
 
 /* Initialize png_ptr structure, and allocate any memory needed */
+#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
+/* Deprecated. */
 #undef png_write_init
 void PNGAPI
 png_write_init(png_structp png_ptr)
@@ -567,6 +572,7 @@ png_write_init_2(png_structp png_ptr, png_const_charp user_png_ver,
    png_size_t png_struct_size, png_size_t png_info_size)
 {
    /* We only come here via pre-1.0.12-compiled applications */
+   if(png_ptr == NULL) return;
 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
    if(png_sizeof(png_struct) > png_struct_size ||
       png_sizeof(png_info) > png_info_size)
@@ -575,11 +581,13 @@ png_write_init_2(png_structp png_ptr, png_const_charp user_png_ver,
       png_ptr->warning_fn=NULL;
       if (user_png_ver)
       {
-        sprintf(msg, "Application was compiled with png.h from libpng-%.20s",
+        png_snprintf(msg, 80,
+           "Application was compiled with png.h from libpng-%.20s",
            user_png_ver);
         png_warning(png_ptr, msg);
       }
-      sprintf(msg, "Application  is  running with png.c from libpng-%.20s",
+      png_snprintf(msg, 80,
+         "Application  is  running with png.c from libpng-%.20s",
          png_libpng_ver);
       png_warning(png_ptr, msg);
    }
@@ -604,6 +612,7 @@ png_write_init_2(png_structp png_ptr, png_const_charp user_png_ver,
      }
    png_write_init_3(&png_ptr, user_png_ver, png_struct_size);
 }
+#endif /* PNG_1_0_X || PNG_1_2_X */
 
 
 void PNGAPI
@@ -614,7 +623,12 @@ png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
 #ifdef PNG_SETJMP_SUPPORTED
    jmp_buf tmp_jmp; /* to save current jump buffer */
 #endif
+
    int i = 0;
+
+   if (png_ptr == NULL)
+      return;
+
    do
    {
      if (user_png_ver[i] != png_libpng_ver[i])
@@ -653,12 +667,6 @@ png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
    png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
 #endif
 
-#if !defined(PNG_1_0_X)
-#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
-   png_init_mmx_flags(png_ptr);   /* 1.2.0 addition */
-#endif
-#endif /* PNG_1_0_X */
-
 #ifdef PNG_SETJMP_SUPPORTED
    /* restore jump buffer */
    png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof (jmp_buf));
@@ -691,6 +699,10 @@ png_write_rows(png_structp png_ptr, png_bytepp row,
    png_bytepp rp; /* row pointer */
 
    png_debug(1, "in png_write_rows\n");
+
+   if (png_ptr == NULL)
+      return;
+
    /* loop through the rows */
    for (i = 0, rp = row; i < num_rows; i++, rp++)
    {
@@ -708,6 +720,9 @@ png_write_image(png_structp png_ptr, png_bytepp image)
    int pass, num_pass; /* pass variables */
    png_bytepp rp; /* points to current row */
 
+   if (png_ptr == NULL)
+      return;
+
    png_debug(1, "in png_write_image\n");
 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
    /* intialize interlace handling.  If image is not interlaced,
@@ -731,8 +746,11 @@ png_write_image(png_structp png_ptr, png_bytepp image)
 void PNGAPI
 png_write_row(png_structp png_ptr, png_bytep row)
 {
+   if (png_ptr == NULL)
+      return;
    png_debug2(1, "in png_write_row (row %ld, pass %d)\n",
       png_ptr->row_number, png_ptr->pass);
+
    /* initialize transformations and other stuff if first time */
    if (png_ptr->row_number == 0 && png_ptr->pass == 0)
    {
@@ -906,6 +924,8 @@ void PNGAPI
 png_set_flush(png_structp png_ptr, int nrows)
 {
    png_debug(1, "in png_set_flush\n");
+   if (png_ptr == NULL)
+      return;
    png_ptr->flush_dist = (nrows < 0 ? 0 : nrows);
 }
 
@@ -916,6 +936,8 @@ png_write_flush(png_structp png_ptr)
    int wrote_IDAT;
 
    png_debug(1, "in png_write_flush\n");
+   if (png_ptr == NULL)
+      return;
    /* We have already written out all of the data */
    if (png_ptr->row_number >= png_ptr->num_rows)
      return;
@@ -983,21 +1005,32 @@ png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
 #endif
    }
 
+#ifdef PNG_USER_MEM_SUPPORTED
+   if (png_ptr != NULL)
+   {
+      free_fn = png_ptr->free_fn;
+      mem_ptr = png_ptr->mem_ptr;
+   }
+#endif
+
    if (info_ptr_ptr != NULL)
       info_ptr = *info_ptr_ptr;
 
    if (info_ptr != NULL)
    {
-      png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
+      if (png_ptr != NULL)
+      {
+        png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
 
 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
-      if (png_ptr->num_chunk_list)
-      {
-         png_free(png_ptr, png_ptr->chunk_list);
-         png_ptr->chunk_list=NULL;
-         png_ptr->num_chunk_list=0;
-      }
+        if (png_ptr->num_chunk_list)
+        {
+           png_free(png_ptr, png_ptr->chunk_list);
+           png_ptr->chunk_list=NULL;
+           png_ptr->num_chunk_list=0;
+        }
 #endif
+      }
 
 #ifdef PNG_USER_MEM_SUPPORTED
       png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
@@ -1043,11 +1076,13 @@ png_write_destroy(png_structp png_ptr)
    /* free our memory.  png_free checks NULL for us. */
    png_free(png_ptr, png_ptr->zbuf);
    png_free(png_ptr, png_ptr->row_buf);
+#ifndef PNG_NO_WRITE_FILTERING
    png_free(png_ptr, png_ptr->prev_row);
    png_free(png_ptr, png_ptr->sub_row);
    png_free(png_ptr, png_ptr->up_row);
    png_free(png_ptr, png_ptr->avg_row);
    png_free(png_ptr, png_ptr->paeth_row);
+#endif
 
 #if defined(PNG_TIME_RFC1123_SUPPORTED)
    png_free(png_ptr, png_ptr->time_buffer);
@@ -1092,6 +1127,8 @@ void PNGAPI
 png_set_filter(png_structp png_ptr, int method, int filters)
 {
    png_debug(1, "in png_set_filter\n");
+   if (png_ptr == NULL)
+      return;
 #if defined(PNG_MNG_FEATURES_SUPPORTED)
    if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
       (method == PNG_INTRAPIXEL_DIFFERENCING))
@@ -1101,15 +1138,26 @@ png_set_filter(png_structp png_ptr, int method, int filters)
    {
       switch (filters & (PNG_ALL_FILTERS | 0x07))
       {
+#ifndef PNG_NO_WRITE_FILTER
          case 5:
          case 6:
          case 7: png_warning(png_ptr, "Unknown row filter for method 0");
-         case PNG_FILTER_VALUE_NONE:  png_ptr->do_filter=PNG_FILTER_NONE; break;
-         case PNG_FILTER_VALUE_SUB:   png_ptr->do_filter=PNG_FILTER_SUB;  break;
-         case PNG_FILTER_VALUE_UP:    png_ptr->do_filter=PNG_FILTER_UP;   break;
-         case PNG_FILTER_VALUE_AVG:   png_ptr->do_filter=PNG_FILTER_AVG;  break;
-         case PNG_FILTER_VALUE_PAETH: png_ptr->do_filter=PNG_FILTER_PAETH;break;
+#endif /* PNG_NO_WRITE_FILTER */
+         case PNG_FILTER_VALUE_NONE:
+              png_ptr->do_filter=PNG_FILTER_NONE; break;
+#ifndef PNG_NO_WRITE_FILTER
+         case PNG_FILTER_VALUE_SUB:
+              png_ptr->do_filter=PNG_FILTER_SUB; break;
+         case PNG_FILTER_VALUE_UP:
+              png_ptr->do_filter=PNG_FILTER_UP; break;
+         case PNG_FILTER_VALUE_AVG:
+              png_ptr->do_filter=PNG_FILTER_AVG; break;
+         case PNG_FILTER_VALUE_PAETH:
+              png_ptr->do_filter=PNG_FILTER_PAETH; break;
          default: png_ptr->do_filter = (png_byte)filters; break;
+#else
+         default: png_warning(png_ptr, "Unknown row filter for method 0");
+#endif /* PNG_NO_WRITE_FILTER */
       }
 
       /* If we have allocated the row_buf, this means we have already started
@@ -1123,6 +1171,7 @@ png_set_filter(png_structp png_ptr, int method, int filters)
        */
       if (png_ptr->row_buf != NULL)
       {
+#ifndef PNG_NO_WRITE_FILTER
          if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL)
          {
             png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
@@ -1177,6 +1226,7 @@ png_set_filter(png_structp png_ptr, int method, int filters)
          }
 
          if (png_ptr->do_filter == PNG_NO_FILTERS)
+#endif /* PNG_NO_WRITE_FILTER */
             png_ptr->do_filter = PNG_FILTER_NONE;
       }
    }
@@ -1200,6 +1250,8 @@ png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
    int i;
 
    png_debug(1, "in png_set_filter_heuristics\n");
+   if (png_ptr == NULL)
+      return;
    if (heuristic_method >= PNG_FILTER_HEURISTIC_LAST)
    {
       png_warning(png_ptr, "Unknown filter heuristic method");
@@ -1312,6 +1364,8 @@ void PNGAPI
 png_set_compression_level(png_structp png_ptr, int level)
 {
    png_debug(1, "in png_set_compression_level\n");
+   if (png_ptr == NULL)
+      return;
    png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_LEVEL;
    png_ptr->zlib_level = level;
 }
@@ -1320,6 +1374,8 @@ void PNGAPI
 png_set_compression_mem_level(png_structp png_ptr, int mem_level)
 {
    png_debug(1, "in png_set_compression_mem_level\n");
+   if (png_ptr == NULL)
+      return;
    png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL;
    png_ptr->zlib_mem_level = mem_level;
 }
@@ -1328,6 +1384,8 @@ void PNGAPI
 png_set_compression_strategy(png_structp png_ptr, int strategy)
 {
    png_debug(1, "in png_set_compression_strategy\n");
+   if (png_ptr == NULL)
+      return;
    png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY;
    png_ptr->zlib_strategy = strategy;
 }
@@ -1335,6 +1393,8 @@ png_set_compression_strategy(png_structp png_ptr, int strategy)
 void PNGAPI
 png_set_compression_window_bits(png_structp png_ptr, int window_bits)
 {
+   if (png_ptr == NULL)
+      return;
    if (window_bits > 15)
       png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");
    else if (window_bits < 8)
@@ -1355,6 +1415,8 @@ void PNGAPI
 png_set_compression_method(png_structp png_ptr, int method)
 {
    png_debug(1, "in png_set_compression_method\n");
+   if (png_ptr == NULL)
+      return;
    if (method != 8)
       png_warning(png_ptr, "Only compression method 8 is supported by PNG");
    png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_METHOD;
@@ -1364,6 +1426,8 @@ png_set_compression_method(png_structp png_ptr, int method)
 void PNGAPI
 png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn)
 {
+   if (png_ptr == NULL)
+      return;
    png_ptr->write_row_fn = write_row_fn;
 }
 
@@ -1373,6 +1437,8 @@ png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
    write_user_transform_fn)
 {
    png_debug(1, "in png_set_write_user_transform_fn\n");
+   if (png_ptr == NULL)
+      return;
    png_ptr->transformations |= PNG_USER_TRANSFORM;
    png_ptr->write_user_transform_fn = write_user_transform_fn;
 }
@@ -1384,6 +1450,8 @@ void PNGAPI
 png_write_png(png_structp png_ptr, png_infop info_ptr,
               int transforms, voidp params)
 {
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
    /* invert the alpha channel from opacity to transparency */
    if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
@@ -1457,8 +1525,8 @@ png_write_png(png_structp png_ptr, png_infop info_ptr,
    /* It is REQUIRED to call this to finish writing the rest of the file */
    png_write_end(png_ptr, info_ptr);
 
-   if(transforms == 0 || params == NULL)
-      /* quiet compiler warnings */ return;
+   transforms = transforms; /* quiet compiler warnings */
+   params = params;
 }
 #endif
 #endif /* PNG_WRITE_SUPPORTED */

pngwtran.c

@@ -1,9 +1,9 @@
 
 /* pngwtran.c - transforms the data in a row for PNG writers
  *
- * libpng version 1.2.8beta1 - November 1, 2004
+ * Last changed in libpng 1.2.9 April 14, 2006
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2004 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2006 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  */
@@ -40,7 +40,7 @@ png_do_write_transformations(png_structp png_ptr)
 #if defined(PNG_WRITE_FILLER_SUPPORTED)
    if (png_ptr->transformations & PNG_FILLER)
       png_do_strip_filler(&(png_ptr->row_info), png_ptr->row_buf + 1,
-         png_ptr->flags,png_ptr->transformations);
+         png_ptr->flags);
 #endif
 #if defined(PNG_WRITE_PACKSWAP_SUPPORTED)
    if (png_ptr->transformations & PNG_PACKSWAP)
@@ -60,14 +60,14 @@ png_do_write_transformations(png_structp png_ptr)
       png_do_shift(&(png_ptr->row_info), png_ptr->row_buf + 1,
          &(png_ptr->shift));
 #endif
-#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
-   if (png_ptr->transformations & PNG_INVERT_ALPHA)
-      png_do_write_invert_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1);
-#endif
 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
    if (png_ptr->transformations & PNG_SWAP_ALPHA)
       png_do_write_swap_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1);
 #endif
+#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
+   if (png_ptr->transformations & PNG_INVERT_ALPHA)
+      png_do_write_invert_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1);
+#endif
 #if defined(PNG_WRITE_BGR_SUPPORTED)
    if (png_ptr->transformations & PNG_BGR)
       png_do_bgr(&(png_ptr->row_info), png_ptr->row_buf + 1);
@@ -439,9 +439,12 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
             png_uint_32 row_width = row_info->width;
             for (i = 0, sp = dp = row; i < row_width; i++)
             {
+               /* does nothing
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
+               */
+               sp+=3; dp = sp;
                *(dp++) = (png_byte)(255 - *(sp++));
             }
          }
@@ -454,12 +457,15 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
 
             for (i = 0, sp = dp = row; i < row_width; i++)
             {
+               /* does nothing
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
+               */
+               sp+=6; dp = sp;
                *(dp++) = (png_byte)(255 - *(sp++));
                *(dp++) = (png_byte)(255 - *(sp++));
             }
@@ -489,8 +495,11 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
 
             for (i = 0, sp = dp = row; i < row_width; i++)
             {
+               /* does nothing
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
+               */
+               sp+=2; dp = sp;
                *(dp++) = (png_byte)(255 - *(sp++));
                *(dp++) = (png_byte)(255 - *(sp++));
             }

pngwutil.c

@@ -1,9 +1,9 @@
 
 /* pngwutil.c - utilities to write a PNG file
  *
- * libpng version 1.2.8beta1 - November 1, 2004
+ * Last changed in libpng 1.2.27 [April 29, 2008]
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2004 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2008 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  */
@@ -16,7 +16,7 @@
  * with unsigned numbers for convenience, although one supported
  * ancillary chunk uses signed (two's complement) numbers.
  */
-void /* PRIVATE */
+void PNGAPI
 png_save_uint_32(png_bytep buf, png_uint_32 i)
 {
    buf[0] = (png_byte)((i >> 24) & 0xff);
@@ -25,12 +25,11 @@ png_save_uint_32(png_bytep buf, png_uint_32 i)
    buf[3] = (png_byte)(i & 0xff);
 }
 
-#if defined(PNG_WRITE_pCAL_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
 /* The png_save_int_32 function assumes integers are stored in two's
  * complement format.  If this isn't the case, then this routine needs to
  * be modified to write data in two's complement format.
  */
-void /* PRIVATE */
+void PNGAPI
 png_save_int_32(png_bytep buf, png_int_32 i)
 {
    buf[0] = (png_byte)((i >> 24) & 0xff);
@@ -38,13 +37,12 @@ png_save_int_32(png_bytep buf, png_int_32 i)
    buf[2] = (png_byte)((i >> 8) & 0xff);
    buf[3] = (png_byte)(i & 0xff);
 }
-#endif
 
 /* Place a 16-bit number into a buffer in PNG byte order.
  * The parameter is declared unsigned int, not png_uint_16,
  * just to avoid potential problems on pre-ANSI C compilers.
  */
-void /* PRIVATE */
+void PNGAPI
 png_save_uint_16(png_bytep buf, unsigned int i)
 {
    buf[0] = (png_byte)((i >> 8) & 0xff);
@@ -64,6 +62,7 @@ void PNGAPI
 png_write_chunk(png_structp png_ptr, png_bytep chunk_name,
    png_bytep data, png_size_t length)
 {
+   if(png_ptr == NULL) return;
    png_write_chunk_start(png_ptr, chunk_name, (png_uint_32)length);
    png_write_chunk_data(png_ptr, data, length);
    png_write_chunk_end(png_ptr);
@@ -79,6 +78,7 @@ png_write_chunk_start(png_structp png_ptr, png_bytep chunk_name,
 {
    png_byte buf[4];
    png_debug2(0, "Writing %s chunk (%lu bytes)\n", chunk_name, length);
+   if(png_ptr == NULL) return;
 
    /* write the length */
    png_save_uint_32(buf, length);
@@ -100,6 +100,7 @@ void PNGAPI
 png_write_chunk_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    /* write the data, and run the CRC over it */
+   if(png_ptr == NULL) return;
    if (data != NULL && length > 0)
    {
       png_calculate_crc(png_ptr, data, length);
@@ -113,6 +114,8 @@ png_write_chunk_end(png_structp png_ptr)
 {
    png_byte buf[4];
 
+   if(png_ptr == NULL) return;
+
    /* write the crc */
    png_save_uint_32(buf, png_ptr->crc);
 
@@ -161,9 +164,11 @@ png_text_compress(png_structp png_ptr,
 {
    int ret;
 
-   comp->num_output_ptr = comp->max_output_ptr = 0;
+   comp->num_output_ptr = 0;
+   comp->max_output_ptr = 0;
    comp->output_ptr = NULL;
    comp->input = NULL;
+   comp->input_len = 0;
 
    /* we may just want to pass the text right through */
    if (compression == PNG_TEXT_COMPRESSION_NONE)
@@ -177,7 +182,7 @@ png_text_compress(png_structp png_ptr,
    {
 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
       char msg[50];
-      sprintf(msg, "Unknown compression type %d", compression);
+      png_snprintf(msg, 50, "Unknown compression type %d", compression);
       png_warning(png_ptr, msg);
 #else
       png_warning(png_ptr, "Unknown compression type");
@@ -357,9 +362,9 @@ png_write_compressed_data_out(png_structp png_ptr, compression_state *comp)
       png_write_chunk_data(png_ptr, png_ptr->zbuf,
          png_ptr->zbuf_size - png_ptr->zstream.avail_out);
 
-   /* reset zlib for another zTXt/iTXt or the image data */
+   /* reset zlib for another zTXt/iTXt or image data */
    deflateReset(&png_ptr->zstream);
-
+   png_ptr->zstream.data_type = Z_BINARY;
 }
 #endif
 
@@ -375,6 +380,8 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
 #ifdef PNG_USE_LOCAL_ARRAYS
    PNG_IHDR;
 #endif
+   int ret;
+
    png_byte buf[13]; /* buffer to store the IHDR info */
 
    png_debug(1, "in png_write_IHDR\n");
@@ -489,7 +496,7 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
    buf[12] = (png_byte)interlace_type;
 
    /* write the chunk */
-   png_write_chunk(png_ptr, (png_bytep)png_IHDR, buf, (png_size_t)13);
+   png_write_chunk(png_ptr, png_IHDR, buf, (png_size_t)13);
 
    /* initialize zlib with PNG info */
    png_ptr->zstream.zalloc = png_zalloc;
@@ -518,11 +525,24 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
       png_ptr->zlib_window_bits = 15;
    if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_METHOD))
       png_ptr->zlib_method = 8;
-   deflateInit2(&png_ptr->zstream, png_ptr->zlib_level,
-      png_ptr->zlib_method, png_ptr->zlib_window_bits,
-      png_ptr->zlib_mem_level, png_ptr->zlib_strategy);
+   ret = deflateInit2(&png_ptr->zstream, png_ptr->zlib_level,
+         png_ptr->zlib_method, png_ptr->zlib_window_bits,
+         png_ptr->zlib_mem_level, png_ptr->zlib_strategy);
+   if (ret != Z_OK)
+   {
+      if (ret == Z_VERSION_ERROR) png_error(png_ptr,
+          "zlib failed to initialize compressor -- version error");
+      if (ret == Z_STREAM_ERROR) png_error(png_ptr,
+           "zlib failed to initialize compressor -- stream error");
+      if (ret == Z_MEM_ERROR) png_error(png_ptr,
+           "zlib failed to initialize compressor -- mem error");
+      png_error(png_ptr, "zlib failed to initialize compressor");
+   }
    png_ptr->zstream.next_out = png_ptr->zbuf;
    png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+   /* libpng is not interested in zstream.data_type */
+   /* set it to a predefined value, to avoid its evaluation inside zlib */
+   png_ptr->zstream.data_type = Z_BINARY;
 
    png_ptr->mode = PNG_HAVE_IHDR;
 }
@@ -569,7 +589,7 @@ png_write_PLTE(png_structp png_ptr, png_colorp palette, png_uint_32 num_pal)
    png_ptr->num_palette = (png_uint_16)num_pal;
    png_debug1(3, "num_palette = %d\n", png_ptr->num_palette);
 
-   png_write_chunk_start(png_ptr, (png_bytep)png_PLTE, num_pal * 3);
+   png_write_chunk_start(png_ptr, png_PLTE, num_pal * 3);
 #ifndef PNG_NO_POINTER_INDEXING
    for (i = 0, pal_ptr = palette; i < num_pal; i++, pal_ptr++)
    {
@@ -641,7 +661,7 @@ png_write_IDAT(png_structp png_ptr, png_bytep data, png_size_t length)
             "Invalid zlib compression method or flags in IDAT");
    }
 
-   png_write_chunk(png_ptr, (png_bytep)png_IDAT, data, length);
+   png_write_chunk(png_ptr, png_IDAT, data, length);
    png_ptr->mode |= PNG_HAVE_IDAT;
 }
 
@@ -653,7 +673,7 @@ png_write_IEND(png_structp png_ptr)
    PNG_IEND;
 #endif
    png_debug(1, "in png_write_IEND\n");
-   png_write_chunk(png_ptr, (png_bytep)png_IEND, png_bytep_NULL,
+   png_write_chunk(png_ptr, png_IEND, png_bytep_NULL,
      (png_size_t)0);
    png_ptr->mode |= PNG_HAVE_IEND;
 }
@@ -674,7 +694,7 @@ png_write_gAMA(png_structp png_ptr, double file_gamma)
    /* file_gamma is saved in 1/100,000ths */
    igamma = (png_uint_32)(file_gamma * 100000.0 + 0.5);
    png_save_uint_32(buf, igamma);
-   png_write_chunk(png_ptr, (png_bytep)png_gAMA, buf, (png_size_t)4);
+   png_write_chunk(png_ptr, png_gAMA, buf, (png_size_t)4);
 }
 #endif
 #ifdef PNG_FIXED_POINT_SUPPORTED
@@ -689,7 +709,7 @@ png_write_gAMA_fixed(png_structp png_ptr, png_fixed_point file_gamma)
    png_debug(1, "in png_write_gAMA\n");
    /* file_gamma is saved in 1/100,000ths */
    png_save_uint_32(buf, (png_uint_32)file_gamma);
-   png_write_chunk(png_ptr, (png_bytep)png_gAMA, buf, (png_size_t)4);
+   png_write_chunk(png_ptr, png_gAMA, buf, (png_size_t)4);
 }
 #endif
 #endif
@@ -709,7 +729,7 @@ png_write_sRGB(png_structp png_ptr, int srgb_intent)
          png_warning(png_ptr,
             "Invalid sRGB rendering intent specified");
    buf[0]=(png_byte)srgb_intent;
-   png_write_chunk(png_ptr, (png_bytep)png_sRGB, buf, (png_size_t)1);
+   png_write_chunk(png_ptr, png_sRGB, buf, (png_size_t)1);
 }
 #endif
 
@@ -725,8 +745,16 @@ png_write_iCCP(png_structp png_ptr, png_charp name, int compression_type,
    png_size_t name_len;
    png_charp new_name;
    compression_state comp;
+   int embedded_profile_len = 0;
 
    png_debug(1, "in png_write_iCCP\n");
+
+   comp.num_output_ptr = 0;
+   comp.max_output_ptr = 0;
+   comp.output_ptr = NULL;
+   comp.input = NULL;
+   comp.input_len = 0;
+
    if (name == NULL || (name_len = png_check_keyword(png_ptr, name,
       &new_name)) == 0)
    {
@@ -740,12 +768,33 @@ png_write_iCCP(png_structp png_ptr, png_charp name, int compression_type,
    if (profile == NULL)
       profile_len = 0;
 
+   if (profile_len > 3)
+      embedded_profile_len =
+          ((*( (png_bytep)profile  ))<<24) |
+          ((*( (png_bytep)profile+1))<<16) |
+          ((*( (png_bytep)profile+2))<< 8) |
+          ((*( (png_bytep)profile+3))    );
+
+   if (profile_len < embedded_profile_len)
+     {
+        png_warning(png_ptr,
+          "Embedded profile length too large in iCCP chunk");
+        return;
+     }
+
+   if (profile_len > embedded_profile_len)
+     {
+        png_warning(png_ptr,
+          "Truncating profile to actual length in iCCP chunk");
+        profile_len = embedded_profile_len;
+     }
+
    if (profile_len)
        profile_len = png_text_compress(png_ptr, profile, (png_size_t)profile_len,
           PNG_COMPRESSION_TYPE_BASE, &comp);
 
    /* make sure we include the NULL after the name and the compression type */
-   png_write_chunk_start(png_ptr, (png_bytep)png_iCCP,
+   png_write_chunk_start(png_ptr, png_iCCP,
           (png_uint_32)name_len+profile_len+2);
    new_name[name_len+1]=0x00;
    png_write_chunk_data(png_ptr, (png_bytep)new_name, name_len + 2);
@@ -785,7 +834,7 @@ png_write_sPLT(png_structp png_ptr, png_sPLT_tp spalette)
    }
 
    /* make sure we include the NULL after the name */
-   png_write_chunk_start(png_ptr, (png_bytep)png_sPLT,
+   png_write_chunk_start(png_ptr, png_sPLT,
           (png_uint_32)(name_len + 2 + palette_size));
    png_write_chunk_data(png_ptr, (png_bytep)new_name, name_len + 1);
    png_write_chunk_data(png_ptr, (png_bytep)&spalette->depth, 1);
@@ -893,7 +942,7 @@ png_write_sBIT(png_structp png_ptr, png_color_8p sbit, int color_type)
       buf[size++] = sbit->alpha;
    }
 
-   png_write_chunk(png_ptr, (png_bytep)png_sBIT, buf, size);
+   png_write_chunk(png_ptr, png_sBIT, buf, size);
 }
 #endif
 
@@ -927,8 +976,7 @@ png_write_cHRM(png_structp png_ptr, double white_x, double white_y,
    itemp = (png_uint_32)(white_y * 100000.0 + 0.5);
    png_save_uint_32(buf + 4, itemp);
 
-   if (red_x < 0 || red_x > 0.8 || red_y < 0 || red_y > 0.8 ||
-       red_x + red_y > 1.0)
+   if (red_x < 0 ||  red_y < 0 || red_x + red_y > 1.0)
    {
       png_warning(png_ptr, "Invalid cHRM red point specified");
       return;
@@ -938,8 +986,7 @@ png_write_cHRM(png_structp png_ptr, double white_x, double white_y,
    itemp = (png_uint_32)(red_y * 100000.0 + 0.5);
    png_save_uint_32(buf + 12, itemp);
 
-   if (green_x < 0 || green_x > 0.8 || green_y < 0 || green_y > 0.8 ||
-       green_x + green_y > 1.0)
+   if (green_x < 0 || green_y < 0 || green_x + green_y > 1.0)
    {
       png_warning(png_ptr, "Invalid cHRM green point specified");
       return;
@@ -949,8 +996,7 @@ png_write_cHRM(png_structp png_ptr, double white_x, double white_y,
    itemp = (png_uint_32)(green_y * 100000.0 + 0.5);
    png_save_uint_32(buf + 20, itemp);
 
-   if (blue_x < 0 || blue_x > 0.8 || blue_y < 0 || blue_y > 0.8 ||
-       blue_x + blue_y > 1.0)
+   if (blue_x < 0 || blue_y < 0 || blue_x + blue_y > 1.0)
    {
       png_warning(png_ptr, "Invalid cHRM blue point specified");
       return;
@@ -960,7 +1006,7 @@ png_write_cHRM(png_structp png_ptr, double white_x, double white_y,
    itemp = (png_uint_32)(blue_y * 100000.0 + 0.5);
    png_save_uint_32(buf + 28, itemp);
 
-   png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, (png_size_t)32);
+   png_write_chunk(png_ptr, png_cHRM, buf, (png_size_t)32);
 }
 #endif
 #ifdef PNG_FIXED_POINT_SUPPORTED
@@ -988,7 +1034,7 @@ png_write_cHRM_fixed(png_structp png_ptr, png_fixed_point white_x,
    png_save_uint_32(buf, (png_uint_32)white_x);
    png_save_uint_32(buf + 4, (png_uint_32)white_y);
 
-   if (red_x > 80000L || red_y > 80000L || red_x + red_y > 100000L)
+   if (red_x + red_y > 100000L)
    {
       png_warning(png_ptr, "Invalid cHRM fixed red point specified");
       return;
@@ -996,7 +1042,7 @@ png_write_cHRM_fixed(png_structp png_ptr, png_fixed_point white_x,
    png_save_uint_32(buf + 8, (png_uint_32)red_x);
    png_save_uint_32(buf + 12, (png_uint_32)red_y);
 
-   if (green_x > 80000L || green_y > 80000L || green_x + green_y > 100000L)
+   if (green_x + green_y > 100000L)
    {
       png_warning(png_ptr, "Invalid fixed cHRM green point specified");
       return;
@@ -1004,7 +1050,7 @@ png_write_cHRM_fixed(png_structp png_ptr, png_fixed_point white_x,
    png_save_uint_32(buf + 16, (png_uint_32)green_x);
    png_save_uint_32(buf + 20, (png_uint_32)green_y);
 
-   if (blue_x > 80000L || blue_y > 80000L || blue_x + blue_y > 100000L)
+   if (blue_x + blue_y > 100000L)
    {
       png_warning(png_ptr, "Invalid fixed cHRM blue point specified");
       return;
@@ -1012,7 +1058,7 @@ png_write_cHRM_fixed(png_structp png_ptr, png_fixed_point white_x,
    png_save_uint_32(buf + 24, (png_uint_32)blue_x);
    png_save_uint_32(buf + 28, (png_uint_32)blue_y);
 
-   png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, (png_size_t)32);
+   png_write_chunk(png_ptr, png_cHRM, buf, (png_size_t)32);
 }
 #endif
 #endif
@@ -1037,7 +1083,7 @@ png_write_tRNS(png_structp png_ptr, png_bytep trans, png_color_16p tran,
          return;
       }
       /* write the chunk out as it is */
-      png_write_chunk(png_ptr, (png_bytep)png_tRNS, trans, (png_size_t)num_trans);
+      png_write_chunk(png_ptr, png_tRNS, trans, (png_size_t)num_trans);
    }
    else if (color_type == PNG_COLOR_TYPE_GRAY)
    {
@@ -1049,7 +1095,7 @@ png_write_tRNS(png_structp png_ptr, png_bytep trans, png_color_16p tran,
          return;
       }
       png_save_uint_16(buf, tran->gray);
-      png_write_chunk(png_ptr, (png_bytep)png_tRNS, buf, (png_size_t)2);
+      png_write_chunk(png_ptr, png_tRNS, buf, (png_size_t)2);
    }
    else if (color_type == PNG_COLOR_TYPE_RGB)
    {
@@ -1063,7 +1109,7 @@ png_write_tRNS(png_structp png_ptr, png_bytep trans, png_color_16p tran,
               "Ignoring attempt to write 16-bit tRNS chunk when bit_depth is 8");
             return;
          }
-      png_write_chunk(png_ptr, (png_bytep)png_tRNS, buf, (png_size_t)6);
+      png_write_chunk(png_ptr, png_tRNS, buf, (png_size_t)6);
    }
    else
    {
@@ -1096,7 +1142,7 @@ png_write_bKGD(png_structp png_ptr, png_color_16p back, int color_type)
          return;
       }
       buf[0] = back->index;
-      png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)1);
+      png_write_chunk(png_ptr, png_bKGD, buf, (png_size_t)1);
    }
    else if (color_type & PNG_COLOR_MASK_COLOR)
    {
@@ -1109,7 +1155,7 @@ png_write_bKGD(png_structp png_ptr, png_color_16p back, int color_type)
               "Ignoring attempt to write 16-bit bKGD chunk when bit_depth is 8");
             return;
          }
-      png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)6);
+      png_write_chunk(png_ptr, png_bKGD, buf, (png_size_t)6);
    }
    else
    {
@@ -1120,7 +1166,7 @@ png_write_bKGD(png_structp png_ptr, png_color_16p back, int color_type)
          return;
       }
       png_save_uint_16(buf, back->gray);
-      png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)2);
+      png_write_chunk(png_ptr, png_bKGD, buf, (png_size_t)2);
    }
 }
 #endif
@@ -1145,7 +1191,7 @@ png_write_hIST(png_structp png_ptr, png_uint_16p hist, int num_hist)
       return;
    }
 
-   png_write_chunk_start(png_ptr, (png_bytep)png_hIST, (png_uint_32)(num_hist * 2));
+   png_write_chunk_start(png_ptr, png_hIST, (png_uint_32)(num_hist * 2));
    for (i = 0; i < num_hist; i++)
    {
       png_save_uint_16(buf, hist[i]);
@@ -1196,12 +1242,14 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
    /* Replace non-printing characters with a blank and print a warning */
    for (kp = key, dp = *new_key; *kp != '\0'; kp++, dp++)
    {
-      if (*kp < 0x20 || (*kp > 0x7E && (png_byte)*kp < 0xA1))
+      if ((png_byte)*kp < 0x20 ||
+         ((png_byte)*kp > 0x7E && (png_byte)*kp < 0xA1))
       {
 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
          char msg[40];
 
-         sprintf(msg, "invalid keyword character 0x%02X", *kp);
+         png_snprintf(msg, 40,
+           "invalid keyword character 0x%02X", (png_byte)*kp);
          png_warning(png_ptr, msg);
 #else
          png_warning(png_ptr, "invalid character in keyword");
@@ -1309,7 +1357,7 @@ png_write_tEXt(png_structp png_ptr, png_charp key, png_charp text,
       text_len = png_strlen(text);
 
    /* make sure we include the 0 after the key */
-   png_write_chunk_start(png_ptr, (png_bytep)png_tEXt, (png_uint_32)key_len+text_len+1);
+   png_write_chunk_start(png_ptr, png_tEXt, (png_uint_32)key_len+text_len+1);
    /*
     * We leave it to the application to meet PNG-1.0 requirements on the
     * contents of the text.  PNG-1.0 through PNG-1.2 discourage the use of
@@ -1341,6 +1389,12 @@ png_write_zTXt(png_structp png_ptr, png_charp key, png_charp text,
 
    png_debug(1, "in png_write_zTXt\n");
 
+   comp.num_output_ptr = 0;
+   comp.max_output_ptr = 0;
+   comp.output_ptr = NULL;
+   comp.input = NULL;
+   comp.input_len = 0;
+
    if (key == NULL || (key_len = png_check_keyword(png_ptr, key, &new_key))==0)
    {
       png_warning(png_ptr, "Empty keyword in zTXt chunk");
@@ -1356,17 +1410,17 @@ png_write_zTXt(png_structp png_ptr, png_charp key, png_charp text,
 
    text_len = png_strlen(text);
 
-   png_free(png_ptr, new_key);
-
    /* compute the compressed data; do it now for the length */
    text_len = png_text_compress(png_ptr, text, text_len, compression,
        &comp);
 
    /* write start of chunk */
-   png_write_chunk_start(png_ptr, (png_bytep)png_zTXt, (png_uint_32)
+   png_write_chunk_start(png_ptr, png_zTXt, (png_uint_32)
       (key_len+text_len+2));
    /* write key */
-   png_write_chunk_data(png_ptr, (png_bytep)key, key_len + 1);
+   png_write_chunk_data(png_ptr, (png_bytep)new_key, key_len + 1);
+   png_free(png_ptr, new_key);
+
    buf[0] = (png_byte)compression;
    /* write compression */
    png_write_chunk_data(png_ptr, (png_bytep)buf, (png_size_t)1);
@@ -1394,6 +1448,11 @@ png_write_iTXt(png_structp png_ptr, int compression, png_charp key,
 
    png_debug(1, "in png_write_iTXt\n");
 
+   comp.num_output_ptr = 0;
+   comp.max_output_ptr = 0;
+   comp.output_ptr = NULL;
+   comp.input = NULL;
+
    if (key == NULL || (key_len = png_check_keyword(png_ptr, key, &new_key))==0)
    {
       png_warning(png_ptr, "Empty keyword in iTXt chunk");
@@ -1424,7 +1483,7 @@ png_write_iTXt(png_structp png_ptr, int compression, png_charp key,
    /* make sure we include the compression flag, the compression byte,
     * and the NULs after the key, lang, and lang_key parts */
 
-   png_write_chunk_start(png_ptr, (png_bytep)png_iTXt,
+   png_write_chunk_start(png_ptr, png_iTXt,
           (png_uint_32)(
         5 /* comp byte, comp flag, terminators for key, lang and lang_key */
         + key_len
@@ -1457,8 +1516,7 @@ png_write_iTXt(png_structp png_ptr, int compression, png_charp key,
 
    png_write_chunk_end(png_ptr);
    png_free(png_ptr, new_key);
-   if (new_lang)
-     png_free(png_ptr, new_lang);
+   png_free(png_ptr, new_lang);
 }
 #endif
 
@@ -1481,10 +1539,9 @@ png_write_oFFs(png_structp png_ptr, png_int_32 x_offset, png_int_32 y_offset,
    png_save_int_32(buf + 4, y_offset);
    buf[8] = (png_byte)unit_type;
 
-   png_write_chunk(png_ptr, (png_bytep)png_oFFs, buf, (png_size_t)9);
+   png_write_chunk(png_ptr, png_oFFs, buf, (png_size_t)9);
 }
 #endif
-
 #if defined(PNG_WRITE_pCAL_SUPPORTED)
 /* write the pCAL chunk (described in the PNG extensions document) */
 void /* PRIVATE */
@@ -1523,7 +1580,7 @@ png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0,
    }
 
    png_debug1(3, "pCAL total length = %d\n", (int)total_len);
-   png_write_chunk_start(png_ptr, (png_bytep)png_pCAL, (png_uint_32)total_len);
+   png_write_chunk_start(png_ptr, png_pCAL, (png_uint_32)total_len);
    png_write_chunk_data(png_ptr, (png_bytep)new_purpose, purpose_len);
    png_save_int_32(buf, X0);
    png_save_int_32(buf + 4, X1);
@@ -1549,39 +1606,41 @@ png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0,
 /* write the sCAL chunk */
 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
 void /* PRIVATE */
-png_write_sCAL(png_structp png_ptr, int unit, double width,double height)
+png_write_sCAL(png_structp png_ptr, int unit, double width, double height)
 {
 #ifdef PNG_USE_LOCAL_ARRAYS
    PNG_sCAL;
 #endif
+   char buf[64];
    png_size_t total_len;
-   char wbuf[32], hbuf[32];
-   png_byte bunit = unit;
 
    png_debug(1, "in png_write_sCAL\n");
 
+   buf[0] = (char)unit;
 #if defined(_WIN32_WCE)
 /* sprintf() function is not supported on WindowsCE */
    {
       wchar_t wc_buf[32];
+      size_t wc_len;
       swprintf(wc_buf, TEXT("%12.12e"), width);
-      WideCharToMultiByte(CP_ACP, 0, wc_buf, -1, wbuf, 32, NULL, NULL);
+      wc_len = wcslen(wc_buf);
+      WideCharToMultiByte(CP_ACP, 0, wc_buf, -1, buf + 1, wc_len, NULL, NULL);
+      total_len = wc_len + 2;
       swprintf(wc_buf, TEXT("%12.12e"), height);
-      WideCharToMultiByte(CP_ACP, 0, wc_buf, -1, hbuf, 32, NULL, NULL);
+      wc_len = wcslen(wc_buf);
+      WideCharToMultiByte(CP_ACP, 0, wc_buf, -1, buf + total_len, wc_len,
+         NULL, NULL);
+      total_len += wc_len;
    }
 #else
-   sprintf(wbuf, "%12.12e", width);
-   sprintf(hbuf, "%12.12e", height);
+   png_snprintf(buf + 1, 63, "%12.12e", width);
+   total_len = 1 + png_strlen(buf + 1) + 1;
+   png_snprintf(buf + total_len, 64-total_len, "%12.12e", height);
+   total_len += png_strlen(buf + total_len);
 #endif
-   total_len = 1 + png_strlen(wbuf)+1 + png_strlen(hbuf);
 
-   png_debug1(3, "sCAL total length = %d\n", (int)total_len);
-   png_write_chunk_start(png_ptr, (png_bytep)png_sCAL, (png_uint_32)total_len);
-   png_write_chunk_data(png_ptr, (png_bytep)&bunit, 1);
-   png_write_chunk_data(png_ptr, (png_bytep)wbuf, png_strlen(wbuf)+1);
-   png_write_chunk_data(png_ptr, (png_bytep)hbuf, png_strlen(hbuf));
-
-   png_write_chunk_end(png_ptr);
+   png_debug1(3, "sCAL total length = %u\n", (unsigned int)total_len);
+   png_write_chunk(png_ptr, png_sCAL, (png_bytep)buf, total_len);
 }
 #else
 #ifdef PNG_FIXED_POINT_SUPPORTED
@@ -1592,23 +1651,26 @@ png_write_sCAL_s(png_structp png_ptr, int unit, png_charp width,
 #ifdef PNG_USE_LOCAL_ARRAYS
    PNG_sCAL;
 #endif
-   png_size_t total_len;
-   char wbuf[32], hbuf[32];
-   png_byte bunit = unit;
+   png_byte buf[64];
+   png_size_t wlen, hlen, total_len;
 
    png_debug(1, "in png_write_sCAL_s\n");
 
-   png_strcpy(wbuf,(const char *)width);
-   png_strcpy(hbuf,(const char *)height);
-   total_len = 1 + png_strlen(wbuf)+1 + png_strlen(hbuf);
+   wlen = png_strlen(width);
+   hlen = png_strlen(height);
+   total_len = wlen + hlen + 2;
+   if (total_len > 64)
+   {
+      png_warning(png_ptr, "Can't write sCAL (buffer too small)");
+      return;
+   }
 
-   png_debug1(3, "sCAL total length = %d\n", total_len);
-   png_write_chunk_start(png_ptr, (png_bytep)png_sCAL, (png_uint_32)total_len);
-   png_write_chunk_data(png_ptr, (png_bytep)&bunit, 1);
-   png_write_chunk_data(png_ptr, (png_bytep)wbuf, png_strlen(wbuf)+1);
-   png_write_chunk_data(png_ptr, (png_bytep)hbuf, png_strlen(hbuf));
+   buf[0] = (png_byte)unit;
+   png_memcpy(buf + 1, width, wlen + 1);      /* append the '\0' here */
+   png_memcpy(buf + wlen + 2, height, hlen);  /* do NOT append the '\0' here */
 
-   png_write_chunk_end(png_ptr);
+   png_debug1(3, "sCAL total length = %u\n", (unsigned int)total_len);
+   png_write_chunk(png_ptr, png_sCAL, buf, total_len);
 }
 #endif
 #endif
@@ -1634,7 +1696,7 @@ png_write_pHYs(png_structp png_ptr, png_uint_32 x_pixels_per_unit,
    png_save_uint_32(buf + 4, y_pixels_per_unit);
    buf[8] = (png_byte)unit_type;
 
-   png_write_chunk(png_ptr, (png_bytep)png_pHYs, buf, (png_size_t)9);
+   png_write_chunk(png_ptr, png_pHYs, buf, (png_size_t)9);
 }
 #endif
 
@@ -1666,7 +1728,7 @@ png_write_tIME(png_structp png_ptr, png_timep mod_time)
    buf[5] = mod_time->minute;
    buf[6] = mod_time->second;
 
-   png_write_chunk(png_ptr, (png_bytep)png_tIME, buf, (png_size_t)7);
+   png_write_chunk(png_ptr, png_tIME, buf, (png_size_t)7);
 }
 #endif
 
@@ -1674,6 +1736,7 @@ png_write_tIME(png_structp png_ptr, png_timep mod_time)
 void /* PRIVATE */
 png_write_start_row(png_structp png_ptr)
 {
+#ifdef PNG_WRITE_INTERLACING_SUPPORTED
 #ifdef PNG_USE_LOCAL_ARRAYS
    /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
 
@@ -1688,6 +1751,7 @@ png_write_start_row(png_structp png_ptr)
 
    /* offset to next interlace block in the y direction */
    int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
+#endif
 #endif
 
    png_size_t buf_size;
@@ -1700,6 +1764,7 @@ png_write_start_row(png_structp png_ptr)
    png_ptr->row_buf = (png_bytep)png_malloc(png_ptr, (png_uint_32)buf_size);
    png_ptr->row_buf[0] = PNG_FILTER_VALUE_NONE;
 
+#ifndef PNG_NO_WRITE_FILTERING
    /* set up filtering buffer, if using this filter */
    if (png_ptr->do_filter & PNG_FILTER_SUB)
    {
@@ -1717,7 +1782,7 @@ png_write_start_row(png_structp png_ptr)
 
       if (png_ptr->do_filter & PNG_FILTER_UP)
       {
-         png_ptr->up_row = (png_bytep )png_malloc(png_ptr,
+         png_ptr->up_row = (png_bytep)png_malloc(png_ptr,
             (png_ptr->rowbytes + 1));
          png_ptr->up_row[0] = PNG_FILTER_VALUE_UP;
       }
@@ -1731,10 +1796,11 @@ png_write_start_row(png_structp png_ptr)
 
       if (png_ptr->do_filter & PNG_FILTER_PAETH)
       {
-         png_ptr->paeth_row = (png_bytep )png_malloc(png_ptr,
+         png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr,
             (png_ptr->rowbytes + 1));
          png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
       }
+#endif /* PNG_NO_WRITE_FILTERING */
    }
 
 #ifdef PNG_WRITE_INTERLACING_SUPPORTED
@@ -1768,6 +1834,7 @@ png_write_start_row(png_structp png_ptr)
 void /* PRIVATE */
 png_write_finish_row(png_structp png_ptr)
 {
+#ifdef PNG_WRITE_INTERLACING_SUPPORTED
 #ifdef PNG_USE_LOCAL_ARRAYS
    /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
 
@@ -1782,6 +1849,7 @@ png_write_finish_row(png_structp png_ptr)
 
    /* offset to next interlace block in the y direction */
    int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
+#endif
 #endif
 
    int ret;
@@ -1871,6 +1939,7 @@ png_write_finish_row(png_structp png_ptr)
    }
 
    deflateReset(&png_ptr->zstream);
+   png_ptr->zstream.data_type = Z_BINARY;
 }
 
 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
@@ -2048,14 +2117,16 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
  * been specified by the application, and then writes the row out with the
  * chosen filter.
  */
-#define PNG_MAXSUM (~((png_uint_32)0) >> 1)
+#define PNG_MAXSUM (((png_uint_32)(-1)) >> 1)
 #define PNG_HISHIFT 10
 #define PNG_LOMASK ((png_uint_32)0xffffL)
 #define PNG_HIMASK ((png_uint_32)(~PNG_LOMASK >> PNG_HISHIFT))
 void /* PRIVATE */
 png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
 {
-   png_bytep prev_row, best_row, row_buf;
+   png_bytep best_row;
+#ifndef PNG_NO_WRITE_FILTER
+   png_bytep prev_row, row_buf;
    png_uint_32 mins, bpp;
    png_byte filter_to_do = png_ptr->do_filter;
    png_uint_32 row_bytes = row_info->rowbytes;
@@ -2068,7 +2139,10 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
    bpp = (row_info->pixel_depth + 7) >> 3;
 
    prev_row = png_ptr->prev_row;
-   best_row = row_buf = png_ptr->row_buf;
+#endif
+   best_row = png_ptr->row_buf;
+#ifndef PNG_NO_WRITE_FILTER
+   row_buf = best_row;
    mins = PNG_MAXSUM;
 
    /* The prediction method we use is to find which method provides the
@@ -2643,11 +2717,12 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
          best_row = png_ptr->paeth_row;
       }
    }
-
+#endif /* PNG_NO_WRITE_FILTER */
    /* Do the actual writing of the filtered row data from the chosen filter. */
 
    png_write_filtered_row(png_ptr, best_row);
 
+#ifndef PNG_NO_WRITE_FILTER
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
    /* Save the type of filter we picked this time for future calculations */
    if (png_ptr->num_prev_filters > 0)
@@ -2660,6 +2735,7 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
       png_ptr->prev_filters[j] = best_row[0];
    }
 #endif
+#endif /* PNG_NO_WRITE_FILTER */
 }
 
 

projects/cbuilder5/libpng.bpf

@@ -1,22 +1,22 @@
-USEUNIT("libpng.cpp");
-USEUNIT("..\..\png.c");
-USEUNIT("..\..\pngerror.c");
-USEUNIT("..\..\pngget.c");
-USEUNIT("..\..\pngmem.c");
-USEUNIT("..\..\pngpread.c");
-USEUNIT("..\..\pngread.c");
-USEUNIT("..\..\pngrio.c");
-USEUNIT("..\..\pngrtran.c");
-USEUNIT("..\..\pngrutil.c");
-USEUNIT("..\..\pngset.c");
-USEUNIT("..\..\pngtrans.c");
-USEUNIT("..\..\pngwio.c");
-USEUNIT("..\..\pngwrite.c");
-USEUNIT("..\..\pngwtran.c");
-USEUNIT("..\..\pngwutil.c");
-USELIB("..\..\..\zlib\zlib.lib");
-//---------------------------------------------------------------------------
-This file is used by the project manager only and should be treated like the project file
-
-
-DllEntryPoint
+USEUNIT("libpng.cpp");
+USEUNIT("..\..\png.c");
+USEUNIT("..\..\pngerror.c");
+USEUNIT("..\..\pngget.c");
+USEUNIT("..\..\pngmem.c");
+USEUNIT("..\..\pngpread.c");
+USEUNIT("..\..\pngread.c");
+USEUNIT("..\..\pngrio.c");
+USEUNIT("..\..\pngrtran.c");
+USEUNIT("..\..\pngrutil.c");
+USEUNIT("..\..\pngset.c");
+USEUNIT("..\..\pngtrans.c");
+USEUNIT("..\..\pngwio.c");
+USEUNIT("..\..\pngwrite.c");
+USEUNIT("..\..\pngwtran.c");
+USEUNIT("..\..\pngwutil.c");
+USELIB("..\..\..\zlib\zlib.lib");
+//---------------------------------------------------------------------------
+This file is used by the project manager only and should be treated like the project file
+
+
+DllEntryPoint

projects/cbuilder5/libpng.bpg

@@ -1,25 +1,25 @@
-#------------------------------------------------------------------------------
-VERSION = BWS.01
-#------------------------------------------------------------------------------
-!ifndef ROOT
-ROOT = $(MAKEDIR)\..
-!endif
-#------------------------------------------------------------------------------
-MAKE = $(ROOT)\bin\make.exe -$(MAKEFLAGS) -f$**
-DCC = $(ROOT)\bin\dcc32.exe $**
-BRCC = $(ROOT)\bin\brcc32.exe $**
-#------------------------------------------------------------------------------
-PROJECTS = libpngstat.lib libpng.dll
-#------------------------------------------------------------------------------
-default: $(PROJECTS)
-#------------------------------------------------------------------------------
-
-libpngstat.lib: libpngstat.bpr
-  $(ROOT)\bin\bpr2mak -t$(ROOT)\bin\deflib.bmk $**
-  $(ROOT)\bin\make -$(MAKEFLAGS) -f$*.mak
-
-libpng.dll: libpng.bpr
-  $(ROOT)\bin\bpr2mak $**
-  $(ROOT)\bin\make -$(MAKEFLAGS) -f$*.mak
-
-
+#------------------------------------------------------------------------------
+VERSION = BWS.01
+#------------------------------------------------------------------------------
+!ifndef ROOT
+ROOT = $(MAKEDIR)\..
+!endif
+#------------------------------------------------------------------------------
+MAKE = $(ROOT)\bin\make.exe -$(MAKEFLAGS) -f$**
+DCC = $(ROOT)\bin\dcc32.exe $**
+BRCC = $(ROOT)\bin\brcc32.exe $**
+#------------------------------------------------------------------------------
+PROJECTS = libpngstat.lib libpng.dll
+#------------------------------------------------------------------------------
+default: $(PROJECTS)
+#------------------------------------------------------------------------------
+
+libpngstat.lib: libpngstat.bpr
+  $(ROOT)\bin\bpr2mak -t$(ROOT)\bin\deflib.bmk $**
+  $(ROOT)\bin\make -$(MAKEFLAGS) -f$*.mak
+
+libpng.dll: libpng.bpr
+  $(ROOT)\bin\bpr2mak $**
+  $(ROOT)\bin\make -$(MAKEFLAGS) -f$*.mak
+
+

projects/cbuilder5/libpng.bpr

@@ -1,157 +1,157 @@
-<?xml version='1.0' encoding='utf-8' ?>
-<!-- C++Builder XML Project -->
-<PROJECT>
-  <MACROS>
-    <VERSION value="BCB.05.03"/>
-    <PROJECT value="libpng.dll"/>
-    <OBJFILES value="libpng.obj ..\..\pngwutil.obj ..\..\pngerror.obj ..\..\pngget.obj 
-      ..\..\pngmem.obj ..\..\pngpread.obj ..\..\pngread.obj ..\..\pngrio.obj 
-      ..\..\pngrtran.obj ..\..\pngrutil.obj ..\..\pngset.obj ..\..\pngtrans.obj 
-      ..\..\pngwio.obj ..\..\pngwrite.obj ..\..\pngwtran.obj ..\..\png.obj"/>
-    <RESFILES value=""/>
-    <DEFFILE value=""/>
-    <RESDEPEN value="$(RESFILES)"/>
-    <LIBFILES value="..\..\..\zlib\zlib.lib"/>
-    <LIBRARIES value="bcbsmp50.lib dclocx50.lib NMFast50.lib Tee50.lib Vclx50.lib Vcl50.lib"/>
-    <SPARELIBS value="Vcl50.lib Vclx50.lib Tee50.lib NMFast50.lib dclocx50.lib bcbsmp50.lib"/>
-    <PACKAGES value="Vcl50.bpi Vclx50.bpi bcbsmp50.bpi Qrpt50.bpi Vcldb50.bpi Vclbde50.bpi 
-      ibsmp50.bpi vcldbx50.bpi TeeUI50.bpi TeeDB50.bpi Tee50.bpi TeeQR50.bpi 
-      VCLIB50.bpi bcbie50.bpi vclie50.bpi Inetdb50.bpi Inet50.bpi NMFast50.bpi 
-      dclocx50.bpi bcb97axserver50.bpi SIMULUSCOMPONENTS.bpi Simulus2.bpi"/>
-    <PATHCPP value=".;..\.."/>
-    <PATHPAS value=".;"/>
-    <PATHRC value=".;"/>
-    <PATHASM value=".;"/>
-    <DEBUGLIBPATH value="$(BCB)\lib\debug"/>
-    <RELEASELIBPATH value="$(BCB)\lib\release"/>
-    <LINKER value="tlink32"/>
-    <USERDEFINES value="PNG_BUILD_DLL;PNG_NO_MODULEDEF"/>
-    <SYSDEFINES value="NO_STRICT;_NO_VCL;_RTLDLL"/>
-    <MAINSOURCE value="libpng.bpf"/>
-    <INCLUDEPATH value="..\..;..\..\..\zlib;$(BCB)\include"/>
-    <LIBPATH value="..\..;$(BCB)\lib\obj;$(BCB)\lib"/>
-    <WARNINGS value="-w8092 -w8091 -w8090 -w8089 -w8087 -wprc -wucp -wstv -wstu -wsig -wpin 
-      -wnod -wnak -wdef -wcln -wbbf -wasm -wamp -wamb"/>
-  </MACROS>
-  <OPTIONS>
-    <CFLAG1 value="-WD -O2 -w -Vx -Ve -x- -RT- -X- -a8 -5 -b- -d -k- -vi -tWD -tWM -c"/>
-    <PFLAGS value="-$Y- -$L- -$D- -$C- -v -JPHNE -M"/>
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-    <AFLAGS value="/mx /w2 /zn"/>
-    <LFLAGS value="-D&quot;&quot; -aa -Tpd -x -Gn -Gi -w"/>
-  </OPTIONS>
-  <LINKER>
-    <ALLOBJ value="c0d32.obj $(OBJFILES)"/>
-    <ALLRES value="$(RESFILES)"/>
-    <ALLLIB value="$(LIBFILES) $(LIBRARIES) import32.lib cw32mti.lib"/>
-  </LINKER>
-  <IDEOPTIONS>
-[Version Info]
-IncludeVerInfo=0
-AutoIncBuild=0
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-MinorVer=0
-Release=0
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-DLL=1
-Locale=2057
-CodePage=1252
-
-[Version Info Keys]
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-
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-
-[HistoryLists\hlIntOutputDir]
-Count=2
-Item0=..\Obj
-Item1=P:\Development\Obj
-
-[Debugging]
-DebugSourceDirs=
-
-[Parameters]
-RunParams=
-HostApplication=P:\Development\Executables\LibPNGTestApp.exe
-RemoteHost=
-RemotePath=
-RemoteDebug=0
-
-[Compiler]
-ShowInfoMsgs=0
-LinkDebugVcl=0
-LinkCGLIB=0
-  </IDEOPTIONS>
+<?xml version='1.0' encoding='utf-8' ?>
+<!-- C++Builder XML Project -->
+<PROJECT>
+  <MACROS>
+    <VERSION value="BCB.05.03"/>
+    <PROJECT value="libpng.dll"/>
+    <OBJFILES value="libpng.obj ..\..\pngwutil.obj ..\..\pngerror.obj ..\..\pngget.obj 
+      ..\..\pngmem.obj ..\..\pngpread.obj ..\..\pngread.obj ..\..\pngrio.obj 
+      ..\..\pngrtran.obj ..\..\pngrutil.obj ..\..\pngset.obj ..\..\pngtrans.obj 
+      ..\..\pngwio.obj ..\..\pngwrite.obj ..\..\pngwtran.obj ..\..\png.obj"/>
+    <RESFILES value=""/>
+    <DEFFILE value=""/>
+    <RESDEPEN value="$(RESFILES)"/>
+    <LIBFILES value="..\..\..\zlib\zlib.lib"/>
+    <LIBRARIES value="bcbsmp50.lib dclocx50.lib NMFast50.lib Tee50.lib Vclx50.lib Vcl50.lib"/>
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+    <PACKAGES value="Vcl50.bpi Vclx50.bpi bcbsmp50.bpi Qrpt50.bpi Vcldb50.bpi Vclbde50.bpi 
+      ibsmp50.bpi vcldbx50.bpi TeeUI50.bpi TeeDB50.bpi Tee50.bpi TeeQR50.bpi 
+      VCLIB50.bpi bcbie50.bpi vclie50.bpi Inetdb50.bpi Inet50.bpi NMFast50.bpi 
+      dclocx50.bpi bcb97axserver50.bpi SIMULUSCOMPONENTS.bpi Simulus2.bpi"/>
+    <PATHCPP value=".;..\.."/>
+    <PATHPAS value=".;"/>
+    <PATHRC value=".;"/>
+    <PATHASM value=".;"/>
+    <DEBUGLIBPATH value="$(BCB)\lib\debug"/>
+    <RELEASELIBPATH value="$(BCB)\lib\release"/>
+    <LINKER value="tlink32"/>
+    <USERDEFINES value="PNG_BUILD_DLL;PNG_NO_MODULEDEF"/>
+    <SYSDEFINES value="NO_STRICT;_NO_VCL;_RTLDLL"/>
+    <MAINSOURCE value="libpng.bpf"/>
+    <INCLUDEPATH value="..\..;..\..\..\zlib;$(BCB)\include"/>
+    <LIBPATH value="..\..;$(BCB)\lib\obj;$(BCB)\lib"/>
+    <WARNINGS value="-w8092 -w8091 -w8090 -w8089 -w8087 -wprc -wucp -wstv -wstu -wsig -wpin 
+      -wnod -wnak -wdef -wcln -wbbf -wasm -wamp -wamb"/>
+  </MACROS>
+  <OPTIONS>
+    <CFLAG1 value="-WD -O2 -w -Vx -Ve -x- -RT- -X- -a8 -5 -b- -d -k- -vi -tWD -tWM -c"/>
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+    <RFLAGS value=""/>
+    <AFLAGS value="/mx /w2 /zn"/>
+    <LFLAGS value="-D&quot;&quot; -aa -Tpd -x -Gn -Gi -w"/>
+  </OPTIONS>
+  <LINKER>
+    <ALLOBJ value="c0d32.obj $(OBJFILES)"/>
+    <ALLRES value="$(RESFILES)"/>
+    <ALLLIB value="$(LIBFILES) $(LIBRARIES) import32.lib cw32mti.lib"/>
+  </LINKER>
+  <IDEOPTIONS>
+[Version Info]
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+
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+Item16=PNG_DLL;PNG_BUILD_DLL;PNG_MODULEDEF
+Item17=_HTML_FORM
+Item18=_DEBUG;_HTML_FORM
+Item19=_DEBUG
+
+[HistoryLists\hlIntOutputDir]
+Count=2
+Item0=..\Obj
+Item1=P:\Development\Obj
+
+[Debugging]
+DebugSourceDirs=
+
+[Parameters]
+RunParams=
+HostApplication=P:\Development\Executables\LibPNGTestApp.exe
+RemoteHost=
+RemotePath=
+RemoteDebug=0
+
+[Compiler]
+ShowInfoMsgs=0
+LinkDebugVcl=0
+LinkCGLIB=0
+  </IDEOPTIONS>
 </PROJECT>

projects/cbuilder5/libpng.cpp

@@ -1,29 +1,29 @@
-//---------------------------------------------------------------------------
-#include <windows.h>
-//---------------------------------------------------------------------------
-//   Important note about DLL memory management when your DLL uses the
-//   static version of the RunTime Library:
-//
-//   If your DLL exports any functions that pass String objects (or structs/
-//   classes containing nested Strings) as parameter or function results,
-//   you will need to add the library MEMMGR.LIB to both the DLL project and
-//   any other projects that use the DLL.  You will also need to use MEMMGR.LIB
-//   if any other projects which use the DLL will be performing new or delete
-//   operations on any non-TObject-derived classes which are exported from the
-//   DLL. Adding MEMMGR.LIB to your project will change the DLL and its calling
-//   EXE's to use the BORLNDMM.DLL as their memory manager.  In these cases,
-//   the file BORLNDMM.DLL should be deployed along with your DLL.
-//
-//   To avoid using BORLNDMM.DLL, pass string information using "char *" or
-//   ShortString parameters.
-//
-//   If your DLL uses the dynamic version of the RTL, you do not need to
-//   explicitly add MEMMGR.LIB as this will be done implicitly for you
-//---------------------------------------------------------------------------
-
-int WINAPI DllEntryPoint(HINSTANCE, unsigned long, void*)
-{
-    return 1;
-}
-//---------------------------------------------------------------------------
+//---------------------------------------------------------------------------
+#include <windows.h>
+//---------------------------------------------------------------------------
+//   Important note about DLL memory management when your DLL uses the
+//   static version of the RunTime Library:
+//
+//   If your DLL exports any functions that pass String objects (or structs/
+//   classes containing nested Strings) as parameter or function results,
+//   you will need to add the library MEMMGR.LIB to both the DLL project and
+//   any other projects that use the DLL.  You will also need to use MEMMGR.LIB
+//   if any other projects which use the DLL will be performing new or delete
+//   operations on any non-TObject-derived classes which are exported from the
+//   DLL. Adding MEMMGR.LIB to your project will change the DLL and its calling
+//   EXE's to use the BORLNDMM.DLL as their memory manager.  In these cases,
+//   the file BORLNDMM.DLL should be deployed along with your DLL.
+//
+//   To avoid using BORLNDMM.DLL, pass string information using "char *" or
+//   ShortString parameters.
+//
+//   If your DLL uses the dynamic version of the RTL, you do not need to
+//   explicitly add MEMMGR.LIB as this will be done implicitly for you
+//---------------------------------------------------------------------------
+
+int WINAPI DllEntryPoint(HINSTANCE, unsigned long, void*)
+{
+    return 1;
+}
+//---------------------------------------------------------------------------
  

projects/cbuilder5/libpngstat.bpf

@@ -1,22 +1,22 @@
-USEUNIT("..\..\png.c");
-USEUNIT("..\..\pngerror.c");
-USEUNIT("..\..\pngget.c");
-USEUNIT("..\..\pngmem.c");
-USEUNIT("..\..\pngpread.c");
-USEUNIT("..\..\pngread.c");
-USEUNIT("..\..\pngrio.c");
-USEUNIT("..\..\pngrtran.c");
-USEUNIT("..\..\pngrutil.c");
-USEUNIT("..\..\pngset.c");
-USEUNIT("..\..\pngtrans.c");
-USEUNIT("..\..\pngwio.c");
-USEUNIT("..\..\pngwrite.c");
-USEUNIT("..\..\pngwtran.c");
-USEUNIT("..\..\pngwutil.c");
-USELIB("..\..\..\zlib\zlib.lib");
-//---------------------------------------------------------------------------
-#define Library
-
-// To add a file to the library use the Project menu 'Add to Project'.
-
+USEUNIT("..\..\png.c");
+USEUNIT("..\..\pngerror.c");
+USEUNIT("..\..\pngget.c");
+USEUNIT("..\..\pngmem.c");
+USEUNIT("..\..\pngpread.c");
+USEUNIT("..\..\pngread.c");
+USEUNIT("..\..\pngrio.c");
+USEUNIT("..\..\pngrtran.c");
+USEUNIT("..\..\pngrutil.c");
+USEUNIT("..\..\pngset.c");
+USEUNIT("..\..\pngtrans.c");
+USEUNIT("..\..\pngwio.c");
+USEUNIT("..\..\pngwrite.c");
+USEUNIT("..\..\pngwtran.c");
+USEUNIT("..\..\pngwutil.c");
+USELIB("..\..\..\zlib\zlib.lib");
+//---------------------------------------------------------------------------
+#define Library
+
+// To add a file to the library use the Project menu 'Add to Project'.
+
  

projects/cbuilder5/libpngstat.bpr

@@ -1,109 +1,109 @@
-<?xml version='1.0' encoding='utf-8' ?>
-<!-- C++Builder XML Project -->
-<PROJECT>
-  <MACROS>
-    <VERSION value="BCB.05.03"/>
-    <PROJECT value="libpngstat.lib"/>
-    <OBJFILES value="..\..\pngerror.obj ..\..\png.obj ..\..\pngwutil.obj ..\..\pngmem.obj 
-      ..\..\pngpread.obj ..\..\pngread.obj ..\..\pngrio.obj ..\..\pngrtran.obj 
-      ..\..\pngrutil.obj ..\..\pngset.obj ..\..\pngtrans.obj ..\..\pngwio.obj 
-      ..\..\pngwrite.obj ..\..\pngwtran.obj ..\..\pngget.obj"/>
-    <RESFILES value=""/>
-    <DEFFILE value=""/>
-    <RESDEPEN value="$(RESFILES)"/>
-    <LIBFILES value="..\..\..\zlib\zlib.lib"/>
-    <LIBRARIES value=""/>
-    <PACKAGES value=""/>
-    <PATHCPP value=".;..\.."/>
-    <PATHPAS value=".;"/>
-    <PATHRC value=".;"/>
-    <PATHASM value=".;"/>
-    <LINKER value="TLib"/>
-    <USERDEFINES value=""/>
-    <SYSDEFINES value="_RTLDLL;NO_STRICT"/>
-    <MAINSOURCE value="libpngstat.bpf"/>
-    <INCLUDEPATH value="..\..;..\..\..\zlib;$(BCB)\include"/>
-    <LIBPATH value="..\..;$(BCB)\lib\obj;$(BCB)\lib"/>
-    <WARNINGS value="-w-par"/>
-    <LISTFILE value=""/>
-  </MACROS>
-  <OPTIONS>
-    <CFLAG1 value="-O2 -w -Vx -Ve -X- -a8 -5 -b- -d -k- -vi -c -tW -tWM"/>
-    <PFLAGS value="-$Y- -$L- -$D- -$C- -v -JPHNE -M"/>
-    <AFLAGS value="/mx /w2 /zn"/>
-    <LFLAGS value=""/>
-  </OPTIONS>
-  <LINKER>
-    <ALLOBJ value="$(OBJFILES)"/>
-    <ALLLIB value=""/>
-  </LINKER>
-  <IDEOPTIONS>
-[Version Info]
-IncludeVerInfo=0
-AutoIncBuild=0
-MajorVer=1
-MinorVer=0
-Release=0
-Build=0
-Debug=0
-PreRelease=0
-Special=0
-Private=0
-DLL=0
-Locale=2057
-CodePage=1252
-
-[Version Info Keys]
-CompanyName=
-FileDescription=
-FileVersion=1.0.0.0
-InternalName=
-LegalCopyright=
-LegalTrademarks=
-OriginalFilename=
-ProductName=
-ProductVersion=1.0.0.0
-Comments=
-
-[HistoryLists\hlIncludePath]
-Count=2
-Item0=..\..;P:\My Documents\Source\PNG+ZLib\zlib;$(BCB)\include
-Item1=..\..;$(BCB)\include;$(BCB)\include\vcl
-
-[HistoryLists\hlLibraryPath]
-Count=1
-Item0=..\..;$(BCB)\lib\obj;$(BCB)\lib
-
-[HistoryLists\hlDebugSourcePath]
-Count=1
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-
-[Language]
-ActiveLang=
-ProjectLang=
-RootDir=
-  </IDEOPTIONS>
+<?xml version='1.0' encoding='utf-8' ?>
+<!-- C++Builder XML Project -->
+<PROJECT>
+  <MACROS>
+    <VERSION value="BCB.05.03"/>
+    <PROJECT value="libpngstat.lib"/>
+    <OBJFILES value="..\..\pngerror.obj ..\..\png.obj ..\..\pngwutil.obj ..\..\pngmem.obj 
+      ..\..\pngpread.obj ..\..\pngread.obj ..\..\pngrio.obj ..\..\pngrtran.obj 
+      ..\..\pngrutil.obj ..\..\pngset.obj ..\..\pngtrans.obj ..\..\pngwio.obj 
+      ..\..\pngwrite.obj ..\..\pngwtran.obj ..\..\pngget.obj"/>
+    <RESFILES value=""/>
+    <DEFFILE value=""/>
+    <RESDEPEN value="$(RESFILES)"/>
+    <LIBFILES value="..\..\..\zlib\zlib.lib"/>
+    <LIBRARIES value=""/>
+    <PACKAGES value=""/>
+    <PATHCPP value=".;..\.."/>
+    <PATHPAS value=".;"/>
+    <PATHRC value=".;"/>
+    <PATHASM value=".;"/>
+    <LINKER value="TLib"/>
+    <USERDEFINES value=""/>
+    <SYSDEFINES value="_RTLDLL;NO_STRICT"/>
+    <MAINSOURCE value="libpngstat.bpf"/>
+    <INCLUDEPATH value="..\..;..\..\..\zlib;$(BCB)\include"/>
+    <LIBPATH value="..\..;$(BCB)\lib\obj;$(BCB)\lib"/>
+    <WARNINGS value="-w-par"/>
+    <LISTFILE value=""/>
+  </MACROS>
+  <OPTIONS>
+    <CFLAG1 value="-O2 -w -Vx -Ve -X- -a8 -5 -b- -d -k- -vi -c -tW -tWM"/>
+    <PFLAGS value="-$Y- -$L- -$D- -$C- -v -JPHNE -M"/>
+    <AFLAGS value="/mx /w2 /zn"/>
+    <LFLAGS value=""/>
+  </OPTIONS>
+  <LINKER>
+    <ALLOBJ value="$(OBJFILES)"/>
+    <ALLLIB value=""/>
+  </LINKER>
+  <IDEOPTIONS>
+[Version Info]
+IncludeVerInfo=0
+AutoIncBuild=0
+MajorVer=1
+MinorVer=0
+Release=0
+Build=0
+Debug=0
+PreRelease=0
+Special=0
+Private=0
+DLL=0
+Locale=2057
+CodePage=1252
+
+[Version Info Keys]
+CompanyName=
+FileDescription=
+FileVersion=1.0.0.0
+InternalName=
+LegalCopyright=
+LegalTrademarks=
+OriginalFilename=
+ProductName=
+ProductVersion=1.0.0.0
+Comments=
+
+[HistoryLists\hlIncludePath]
+Count=2
+Item0=..\..;P:\My Documents\Source\PNG+ZLib\zlib;$(BCB)\include
+Item1=..\..;$(BCB)\include;$(BCB)\include\vcl
+
+[HistoryLists\hlLibraryPath]
+Count=1
+Item0=..\..;$(BCB)\lib\obj;$(BCB)\lib
+
+[HistoryLists\hlDebugSourcePath]
+Count=1
+Item0=$(BCB)\source\vcl
+
+[HistoryLists\hlConditionals]
+Count=1
+Item0=_DEBUG
+
+[HistoryLists\hlTlibPageSize]
+Count=1
+Item0=0x0010
+
+[Debugging]
+DebugSourceDirs=$(BCB)\source\vcl
+
+[Parameters]
+RunParams=
+HostApplication=
+RemoteHost=
+RemotePath=
+RemoteDebug=0
+
+[Compiler]
+ShowInfoMsgs=0
+LinkDebugVcl=0
+LinkCGLIB=0
+
+[Language]
+ActiveLang=
+ProjectLang=
+RootDir=
+  </IDEOPTIONS>
 </PROJECT>

projects/visualc6/README.txt

@@ -31,11 +31,11 @@ To use:
 
 This project builds the libpng binaries as follows:
 
-* Win32_DLL_Release\libpng13.dll      DLL build
-* Win32_DLL_Debug\libpng13d.dll       DLL build (debug version)
-* Win32_DLL_ASM_Release\libpng13.dll  DLL build using ASM code
-* Win32_DLL_ASM_Debug\libpng13d.dll   DLL build using ASM (debug version)
-* Win32_DLL_VB\libpng13vb.dll         DLL build for Visual Basic, using stdcall
+* Win32_DLL_Release\libpng10.dll      DLL build
+* Win32_DLL_Debug\libpng10d.dll       DLL build (debug version)
+* Win32_DLL_ASM_Release\libpng10.dll  DLL build using ASM code
+* Win32_DLL_ASM_Debug\libpng10d.dll   DLL build using ASM (debug version)
+* Win32_DLL_VB\libpng10vb.dll         DLL build for Visual Basic, using stdcall
 * Win32_LIB_Release\libpng.lib        static build
 * Win32_LIB_Debug\libpngd.lib         static build (debug version)
 * Win32_LIB_ASM_Release\libpng.lib    static build using ASM code
@@ -46,16 +46,9 @@ Notes:
 
 If you change anything in the source files, or select different compiler
 settings, please change the DLL name to something different than any of
-the above names.
-
-Also, make sure that DLLFNAME_POSTFIX and (PRIVATEBUILD or SPECIALBUILD)
-are defined when compiling the resource file.  DLLFNAME_POSTFIX contains
-the trailing letters that come after the version number.  PRIVATEBUILD
-and/or SPECIALBUILD store information describing the type of change made
-in the VERSIONINFO structure.  Please refer to MSDN for more information
-on the used macros and the nature of their content.  For an example on
-how to define these macros, look at the resource compiler settings for
-the "Win32 DLL VB" configuration.
+the above names. Also, make sure that in your "pngusr.h" you define
+PNG_USER_PRIVATEBUILD and PNG_USER_DLLFNAME_POSTFIX according to the
+instructions provided in "pngconf.h".
 
 All DLLs built by this project use the Microsoft dynamic C runtime library
 MSVCRT.DLL (MSVCRTD.DLL for debug versions).  If you distribute any of the

projects/visualc6/libpng.dsp

@@ -1,507 +1,472 @@
-# Microsoft Developer Studio Project File - Name="libpng" - Package Owner=<4>
-# Microsoft Developer Studio Generated Build File, Format Version 6.00
-# ** DO NOT EDIT **
-
-# TARGTYPE "Win32 (x86) Dynamic-Link Library" 0x0102
-# TARGTYPE "Win32 (x86) Static Library" 0x0104
-
-CFG=libpng - Win32 DLL Release
-!MESSAGE This is not a valid makefile. To build this project using NMAKE,
-!MESSAGE use the Export Makefile command and run
-!MESSAGE 
-!MESSAGE NMAKE /f "libpng.mak".
-!MESSAGE 
-!MESSAGE You can specify a configuration when running NMAKE
-!MESSAGE by defining the macro CFG on the command line. For example:
-!MESSAGE 
-!MESSAGE NMAKE /f "libpng.mak" CFG="libpng - Win32 DLL Release"
-!MESSAGE 
-!MESSAGE Possible choices for configuration are:
-!MESSAGE 
-!MESSAGE "libpng - Win32 DLL Release" (based on "Win32 (x86) Dynamic-Link Library")
-!MESSAGE "libpng - Win32 DLL Debug" (based on "Win32 (x86) Dynamic-Link Library")
-!MESSAGE "libpng - Win32 DLL ASM Release" (based on "Win32 (x86) Dynamic-Link Library")
-!MESSAGE "libpng - Win32 DLL ASM Debug" (based on "Win32 (x86) Dynamic-Link Library")
-!MESSAGE "libpng - Win32 DLL VB" (based on "Win32 (x86) Dynamic-Link Library")
-!MESSAGE "libpng - Win32 LIB Release" (based on "Win32 (x86) Static Library")
-!MESSAGE "libpng - Win32 LIB Debug" (based on "Win32 (x86) Static Library")
-!MESSAGE "libpng - Win32 LIB ASM Release" (based on "Win32 (x86) Static Library")
-!MESSAGE "libpng - Win32 LIB ASM Debug" (based on "Win32 (x86) Static Library")
-!MESSAGE 
-
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+
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+!ELSEIF  "$(CFG)" == "libpng - Win32 LIB Debug"
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+# SUBTRACT CPP /YX /Yc /Yu
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+!ELSEIF  "$(CFG)" == "libpng - Win32 LIB ASM Debug"
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+# PROP BASE Use_MFC 0
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+# SUBTRACT CPP /YX /Yc /Yu
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+!IF  "$(CFG)" == "libpng - Win32 DLL Release"
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+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL Debug"
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+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL ASM Release"
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+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL ASM Debug"
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+!IF  "$(CFG)" == "libpng - Win32 DLL Release"
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+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL ASM Debug"
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+!ELSEIF  "$(CFG)" == "libpng - Win32 LIB Release"
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+# PROP Exclude_From_Build 1
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+!ELSEIF  "$(CFG)" == "libpng - Win32 LIB Debug"
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+# PROP Exclude_From_Build 1
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+!ELSEIF  "$(CFG)" == "libpng - Win32 LIB ASM Release"
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+# PROP Exclude_From_Build 1
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+!ELSEIF  "$(CFG)" == "libpng - Win32 LIB ASM Debug"
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+# PROP Exclude_From_Build 1
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+!ENDIF
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+# End Source File
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projects/visualc6/libpng.dsw

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projects/visualc6/pngtest.dsp

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projects/visualc71/PRJ0041.mak

@@ -0,0 +1,21 @@
+# Prevent "Cannot find missing dependency..." warnings while compiling
+# pngw32.rc (PRJ0041).
+
+all: $(IntDir)\alloc.h \
+	 $(IntDir)\fp.h \
+	 $(IntDir)\m68881.h \
+	 $(IntDir)\mem.h \
+	 $(IntDir)\pngusr.h \
+	 $(IntDir)\strings.h \
+	 $(IntDir)\unistd.h \
+	 $(IntDir)\unixio.h
+	 
+$(IntDir)\alloc.h \
+$(IntDir)\fp.h \
+$(IntDir)\m68881.h \
+$(IntDir)\mem.h \
+$(IntDir)\pngusr.h \
+$(IntDir)\strings.h \
+$(IntDir)\unistd.h \
+$(IntDir)\unixio.h:
+	@!echo.>$@

projects/visualc71/README.txt

@@ -0,0 +1,57 @@
+Microsoft Developer Studio Project File, Format Version 7.10 for libpng.
+
+Copyright (C) 2004 Simon-Pierre Cadieux.
+For conditions of distribution and use, see copyright notice in png.h
+
+Assumptions:
+* The libpng source files are in ..\..
+* The zlib source files are in ..\..\..\zlib
+* The zlib project file is in . /* Warning: This is until the zlib project
+  files get intergrated into the next zlib release. The final zlib project
+  directory will then be ..\..\..\zlib\projects\visualc71. */
+
+To use:
+
+1) On the main menu, select "File | Open Solution".
+   Open "libpng.sln".
+
+2) Display the Solution Explorer view (Ctrl+Alt+L)
+
+3) Set one of the project as the StartUp project. If you just want to build the
+   binaries set "libpng" as the startup project (Select "libpng" tree view
+   item + Project | Set as StartUp project). If you want to build and test the
+   binaries set it to "pngtest" (Select "pngtest" tree view item +
+   Project | Set as StartUp project)
+
+4) Select "Build | Configuration Manager...".
+   Choose the configuration you wish to build.
+
+5) Select "Build | Clean Solution".
+
+6) Select "Build | Build Solution (Ctrl-Shift-B)"
+
+This project builds the libpng binaries as follows:
+
+* Win32_DLL_Release\libpng10.dll      DLL build
+* Win32_DLL_Debug\libpng10d.dll       DLL build (debug version)
+* Win32_DLL_ASM_Release\libpng10.dll  DLL build using ASM code
+* Win32_DLL_ASM_Debug\libpng10d.dll   DLL build using ASM (debug version)
+* Win32_DLL_VB\libpng10vb.dll         DLL build for Visual Basic, using stdcall
+* Win32_LIB_Release\libpng.lib        static build
+* Win32_LIB_Debug\libpngd.lib         static build (debug version)
+* Win32_LIB_ASM_Release\libpng.lib    static build using ASM code
+* Win32_LIB_ASM_Debug\libpngd.lib     static build using ASM (debug version)
+
+Notes:
+
+If you change anything in the source files, or select different compiler
+settings, please change the DLL name to something different than any of
+the above names. Also, make sure that in your "pngusr.h" you define
+PNG_USER_PRIVATEBUILD and PNG_USER_DLLFNAME_POSTFIX according to the
+instructions provided in "pngconf.h".
+
+All DLLs built by this project use the Microsoft dynamic C runtime library
+MSVCR71.DLL (MSVCR71D.DLL for debug versions).  If you distribute any of the
+above mentioned libraries you may have to include this DLL in your package.
+For a list of files that are redistributable in Visual Studio see
+$(VCINSTALLDIR)\redist.txt.

projects/visualc71/README_zlib.txt

@@ -0,0 +1,44 @@
+/* WARNING: This file was put in the LibPNG distribution for convenience only.
+            It is expected to be part of the next zlib release under
+            "projects\visualc71\README.txt." */
+
+Microsoft Developer Studio Project File, Format Version 7.10 for zlib.
+
+Copyright (C) 2004 Simon-Pierre Cadieux.
+Copyright (C) 2004 Cosmin Truta.
+For conditions of distribution and use, see copyright notice in zlib.h.
+
+
+To use:
+
+1) On the main menu, select "File | Open Solution".
+   Open "zlib.sln".
+
+2) Display the Solution Explorer view (Ctrl+Alt+L)
+
+3) Set one of the project as the StartUp project. If you just want to build the
+   binaries set "zlib" as the startup project (Select "zlib" tree view item +
+   Project | Set as StartUp project). If you want to build and test the
+   binaries set it to "example" (Select "example" tree view item + Project |
+   Set as StartUp project), If you want to build the minigzip utility set it to
+   "minigzip" (Select "minigzip" tree view item + Project | Set as StartUp
+   project
+
+4) Select "Build | Configuration Manager...".
+   Choose the configuration you wish to build.
+
+5) Select "Build | Clean Solution".
+
+6) Select "Build | Build Solution (Ctrl-Shift-B)"
+
+This project builds the zlib binaries as follows:
+
+* Win32_DLL_Release\zlib1.dll       DLL build
+* Win32_DLL_Debug\zlib1d.dll        DLL build (debug version)
+* Win32_DLL_ASM_Release\zlib1.dll   DLL build using ASM code
+* Win32_DLL_ASM_Debug\zlib1d.dll    DLL build using ASM code (debug version)
+* Win32_LIB_Release\zlib.lib        static build
+* Win32_LIB_Debug\zlibd.lib         static build (debug version)
+* Win32_LIB_ASM_Release\zlib.lib    static build using ASM code
+* Win32_LIB_ASM_Debug\zlibd.lib     static build using ASM code (debug version)
+

projects/visualc71/libpng.sln

@@ -0,0 +1,88 @@
+Microsoft Visual Studio Solution File, Format Version 8.00
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "libpng", "libpng.vcproj", "{0008960E-E0DD-41A6-8265-00B31DDB4C21}"
+	ProjectSection(ProjectDependencies) = postProject
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0} = {2D4F8105-7D21-454C-9932-B47CAB71A5C0}
+	EndProjectSection
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "pngtest", "pngtest.vcproj", "{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}"
+	ProjectSection(ProjectDependencies) = postProject
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21} = {0008960E-E0DD-41A6-8265-00B31DDB4C21}
+	EndProjectSection
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "zlib", "zlib.vcproj", "{2D4F8105-7D21-454C-9932-B47CAB71A5C0}"
+	ProjectSection(ProjectDependencies) = postProject
+	EndProjectSection
+EndProject
+Global
+	GlobalSection(SolutionConfiguration) = preSolution
+		DLL ASM Debug = DLL ASM Debug
+		DLL ASM Release = DLL ASM Release
+		DLL Debug = DLL Debug
+		DLL Release = DLL Release
+		DLL VB = DLL VB
+		LIB ASM Debug = LIB ASM Debug
+		LIB ASM Release = LIB ASM Release
+		LIB Debug = LIB Debug
+		LIB Release = LIB Release
+	EndGlobalSection
+	GlobalSection(ProjectConfiguration) = postSolution
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21}.DLL ASM Debug.ActiveCfg = DLL ASM Debug|Win32
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21}.DLL ASM Debug.Build.0 = DLL ASM Debug|Win32
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21}.DLL ASM Release.ActiveCfg = DLL ASM Release|Win32
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21}.DLL ASM Release.Build.0 = DLL ASM Release|Win32
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21}.DLL Debug.ActiveCfg = DLL Debug|Win32
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21}.DLL Debug.Build.0 = DLL Debug|Win32
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21}.DLL Release.ActiveCfg = DLL Release|Win32
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21}.DLL Release.Build.0 = DLL Release|Win32
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21}.DLL VB.ActiveCfg = DLL VB|Win32
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21}.DLL VB.Build.0 = DLL VB|Win32
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21}.LIB ASM Debug.ActiveCfg = LIB ASM Debug|Win32
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21}.LIB ASM Debug.Build.0 = LIB ASM Debug|Win32
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21}.LIB ASM Release.ActiveCfg = LIB ASM Release|Win32
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21}.LIB ASM Release.Build.0 = LIB ASM Release|Win32
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21}.LIB Debug.ActiveCfg = LIB Debug|Win32
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21}.LIB Debug.Build.0 = LIB Debug|Win32
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21}.LIB Release.ActiveCfg = LIB Release|Win32
+		{0008960E-E0DD-41A6-8265-00B31DDB4C21}.LIB Release.Build.0 = LIB Release|Win32
+		{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}.DLL ASM Debug.ActiveCfg = DLL ASM Debug|Win32
+		{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}.DLL ASM Debug.Build.0 = DLL ASM Debug|Win32
+		{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}.DLL ASM Release.ActiveCfg = DLL ASM Release|Win32
+		{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}.DLL ASM Release.Build.0 = DLL ASM Release|Win32
+		{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}.DLL Debug.ActiveCfg = DLL Debug|Win32
+		{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}.DLL Debug.Build.0 = DLL Debug|Win32
+		{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}.DLL Release.ActiveCfg = DLL Release|Win32
+		{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}.DLL Release.Build.0 = DLL Release|Win32
+		{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}.DLL VB.ActiveCfg = DLL VB|Win32
+		{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}.DLL VB.Build.0 = DLL VB|Win32
+		{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}.LIB ASM Debug.ActiveCfg = LIB ASM Debug|Win32
+		{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}.LIB ASM Debug.Build.0 = LIB ASM Debug|Win32
+		{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}.LIB ASM Release.ActiveCfg = LIB ASM Release|Win32
+		{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}.LIB ASM Release.Build.0 = LIB ASM Release|Win32
+		{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}.LIB Debug.ActiveCfg = LIB Debug|Win32
+		{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}.LIB Debug.Build.0 = LIB Debug|Win32
+		{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}.LIB Release.ActiveCfg = LIB Release|Win32
+		{FD1C2F86-9EEF-47BD-95A4-530917E17FDA}.LIB Release.Build.0 = LIB Release|Win32
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0}.DLL ASM Debug.ActiveCfg = DLL ASM Debug|Win32
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0}.DLL ASM Debug.Build.0 = DLL ASM Debug|Win32
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0}.DLL ASM Release.ActiveCfg = DLL ASM Release|Win32
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0}.DLL ASM Release.Build.0 = DLL ASM Release|Win32
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0}.DLL Debug.ActiveCfg = DLL Debug|Win32
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0}.DLL Debug.Build.0 = DLL Debug|Win32
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0}.DLL Release.ActiveCfg = DLL Release|Win32
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0}.DLL Release.Build.0 = DLL Release|Win32
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0}.DLL VB.ActiveCfg = DLL Release|Win32
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0}.DLL VB.Build.0 = DLL Release|Win32
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0}.LIB ASM Debug.ActiveCfg = LIB ASM Debug|Win32
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0}.LIB ASM Debug.Build.0 = LIB ASM Debug|Win32
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0}.LIB ASM Release.ActiveCfg = LIB ASM Release|Win32
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0}.LIB ASM Release.Build.0 = LIB ASM Release|Win32
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0}.LIB Debug.ActiveCfg = LIB Debug|Win32
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0}.LIB Debug.Build.0 = LIB Debug|Win32
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0}.LIB Release.ActiveCfg = LIB Release|Win32
+		{2D4F8105-7D21-454C-9932-B47CAB71A5C0}.LIB Release.Build.0 = LIB Release|Win32
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+	EndGlobalSection
+	GlobalSection(ExtensibilityAddIns) = postSolution
+	EndGlobalSection
+EndGlobal

projects/visualc71/libpng.vcproj

@@ -0,0 +1,702 @@
+<?xml version="1.0" encoding="Windows-1252"?>
+<VisualStudioProject
+	ProjectType="Visual C++"
+	Version="7.10"
+	Name="libpng"
+	RootNamespace="libpng">
+	<Platforms>
+		<Platform
+			Name="Win32"/>
+	</Platforms>
+	<Configurations>
+		<Configuration
+			Name="DLL Release|Win32"
+			OutputDirectory=".\Win32_DLL_Release"
+			IntermediateDirectory=".\Win32_DLL_Release"
+			ConfigurationType="2">
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..;..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;PNG_NO_MMX_CODE;NDEBUG;PNG_BUILD_DLL;ZLIB_DLL;_CRT_SECURE_NO_WARNINGS"
+				StringPooling="TRUE"
+				RuntimeLibrary="2"
+				EnableFunctionLevelLinking="TRUE"
+				UsePrecompiledHeader="3"
+				PrecompiledHeaderThrough="png.h"
+				WarningLevel="3"
+				CompileAs="0"/>
+			<Tool
+				Name="VCCustomBuildTool"/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)/libpng10.dll"
+				LinkIncremental="1"
+				ModuleDefinitionFile="..\..\scripts\pngw32.def"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				PreprocessorDefinitions="NDEBUG;_CRT_SECURE_NO_WARNINGS"
+				Culture="1033"
+				AdditionalIncludeDirectories="..\..;..\..\..\zlib;$(IntDir)"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCWebDeploymentTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+		<Configuration
+			Name="DLL Debug|Win32"
+			OutputDirectory=".\Win32_DLL_Debug"
+			IntermediateDirectory=".\Win32_DLL_Debug"
+			ConfigurationType="2">
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..;..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;_DEBUG;DEBUG;PNG_NO_MMX_CODE;PNG_DEBUG=1;PNG_BUILD_DLL;ZLIB_DLL;_CRT_SECURE_NO_WARNINGS"
+				BasicRuntimeChecks="3"
+				RuntimeLibrary="3"
+				UsePrecompiledHeader="3"
+				PrecompiledHeaderThrough="png.h"
+				WarningLevel="3"
+				DebugInformationFormat="4"
+				CompileAs="0"/>
+			<Tool
+				Name="VCCustomBuildTool"/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)/libpng10d.dll"
+				ModuleDefinitionFile="..\..\scripts\pngw32.def"
+				GenerateDebugInformation="TRUE"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				PreprocessorDefinitions="_DEBUG,PNG_DEBUG=1;_CRT_SECURE_NO_WARNINGS"
+				Culture="1033"
+				AdditionalIncludeDirectories="..\..;..\..\..\zlib;$(IntDir)"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCWebDeploymentTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+		<Configuration
+			Name="DLL ASM Release|Win32"
+			OutputDirectory=".\Win32_DLL_ASM_Release"
+			IntermediateDirectory=".\Win32_DLL_ASM_Release"
+			ConfigurationType="2">
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..;..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;NDEBUG;PNG_USE_PNGVCRD;PNG_BUILD_DLL;ZLIB_DLL;PNG_LIBPNG_SPECIALBUILD;_CRT_SECURE_NO_WARNINGS"
+				StringPooling="TRUE"
+				RuntimeLibrary="2"
+				EnableFunctionLevelLinking="TRUE"
+				UsePrecompiledHeader="3"
+				PrecompiledHeaderThrough="png.h"
+				WarningLevel="3"
+				CompileAs="0"/>
+			<Tool
+				Name="VCCustomBuildTool"/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)/libpng10.dll"
+				LinkIncremental="1"
+				ModuleDefinitionFile="..\..\scripts\pngw32.def"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				AdditionalOptions="/d PNG_LIBPNG_SPECIALBUILD=&quot;&quot;&quot;&quot;Use MMX instructions&quot;&quot;&quot;&quot;"
+				PreprocessorDefinitions="NDEBUG;_CRT_SECURE_NO_WARNINGS"
+				Culture="1033"
+				AdditionalIncludeDirectories="..\..;..\..\..\zlib;$(IntDir)"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCWebDeploymentTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+		<Configuration
+			Name="DLL ASM Debug|Win32"
+			OutputDirectory=".\Win32_DLL_ASM_Debug"
+			IntermediateDirectory=".\Win32_DLL_ASM_Debug"
+			ConfigurationType="2">
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..;..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;_DEBUG;DEBUG;PNG_DEBUG=1;PNG_USE_PNGVCRD;PNG_BUILD_DLL;ZLIB_DLL;PNG_LIBPNG_SPECIALBUILD;_CRT_SECURE_NO_WARNINGS"
+				BasicRuntimeChecks="3"
+				RuntimeLibrary="3"
+				UsePrecompiledHeader="3"
+				PrecompiledHeaderThrough="png.h"
+				WarningLevel="3"
+				DebugInformationFormat="4"
+				CompileAs="0"/>
+			<Tool
+				Name="VCCustomBuildTool"/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)/libpng10d.dll"
+				ModuleDefinitionFile="..\..\scripts\pngw32.def"
+				GenerateDebugInformation="TRUE"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				AdditionalOptions="/d PNG_LIBPNG_SPECIALBUILD=&quot;&quot;&quot;&quot;Use MMX instructions&quot;&quot;&quot;&quot;"
+				PreprocessorDefinitions="_DEBUG,PNG_DEBUG=1;_CRT_SECURE_NO_WARNINGS"
+				Culture="1033"
+				AdditionalIncludeDirectories="..\..;..\..\..\zlib;$(IntDir)"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCWebDeploymentTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+		<Configuration
+			Name="DLL VB|Win32"
+			OutputDirectory=".\Win32_DLL_VB"
+			IntermediateDirectory=".\Win32_DLL_VB"
+			ConfigurationType="2">
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..;..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;NDEBUG;PNG_BUILD_DLL;ZLIB_DLL;PNGAPI=__stdcall;PNG_NO_MMX_CODE;PNG_NO_MODULEDEF;PNG_LIBPNG_SPECIALBUILD;_CRT_SECURE_NO_WARNINGS"
+				StringPooling="TRUE"
+				RuntimeLibrary="2"
+				EnableFunctionLevelLinking="TRUE"
+				UsePrecompiledHeader="3"
+				PrecompiledHeaderThrough="png.h"
+				WarningLevel="3"
+				CompileAs="0"/>
+			<Tool
+				Name="VCCustomBuildTool"/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)/libpng10vb.dll"
+				LinkIncremental="1"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				AdditionalOptions="/d PNG_LIBPNG_DLLFNAME_POSTFIX=&quot;&quot;&quot;&quot;VB&quot;&quot;&quot;&quot; /d PNG_LIBPNG_SPECIALBUILD=&quot;&quot;&quot;&quot;__stdcall calling convention used for exported functions&quot;&quot;&quot;&quot;"
+				PreprocessorDefinitions="NDEBUG;_CRT_SECURE_NO_WARNINGS"
+				Culture="1033"
+				AdditionalIncludeDirectories="..\..;..\..\..\zlib;$(IntDir)"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCWebDeploymentTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+		<Configuration
+			Name="LIB Release|Win32"
+			OutputDirectory=".\Win32_LIB_Release"
+			IntermediateDirectory=".\Win32_LIB_Release"
+			ConfigurationType="4">
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..;..\..\..\zlib"
+				PreprocessorDefinitions="PNG_NO_MMX_CODE;WIN32;NDEBUG;_CRT_SECURE_NO_WARNINGS"
+				StringPooling="TRUE"
+				RuntimeLibrary="2"
+				EnableFunctionLevelLinking="TRUE"
+				UsePrecompiledHeader="3"
+				PrecompiledHeaderThrough="png.h"
+				WarningLevel="3"
+				CompileAs="0"/>
+			<Tool
+				Name="VCCustomBuildTool"/>
+			<Tool
+				Name="VCLibrarianTool"
+				OutputFile="$(OutDir)/libpng.lib"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+		<Configuration
+			Name="LIB Debug|Win32"
+			OutputDirectory=".\Win32_LIB_Debug"
+			IntermediateDirectory=".\Win32_LIB_Debug"
+			ConfigurationType="4">
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..;..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;_DEBUG;DEBUG;PNG_NO_MMX_CODE;PNG_DEBUG=1;_CRT_SECURE_NO_WARNINGS"
+				BasicRuntimeChecks="3"
+				RuntimeLibrary="3"
+				UsePrecompiledHeader="3"
+				PrecompiledHeaderThrough="png.h"
+				WarningLevel="3"
+				DebugInformationFormat="4"
+				CompileAs="0"/>
+			<Tool
+				Name="VCCustomBuildTool"/>
+			<Tool
+				Name="VCLibrarianTool"
+				OutputFile="$(OutDir)/libpngd.lib"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+		<Configuration
+			Name="LIB ASM Release|Win32"
+			OutputDirectory=".\Win32_LIB_ASM_Release"
+			IntermediateDirectory=".\Win32_LIB_ASM_Release"
+			ConfigurationType="4">
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..,..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;NDEBUG;PNG_USE_PNGVCRD;PNG_LIBPNG_SPECIALBUILD;_CRT_SECURE_NO_WARNINGS"
+				StringPooling="TRUE"
+				RuntimeLibrary="2"
+				EnableFunctionLevelLinking="TRUE"
+				UsePrecompiledHeader="3"
+				PrecompiledHeaderThrough="png.h"
+				WarningLevel="3"
+				CompileAs="0"/>
+			<Tool
+				Name="VCCustomBuildTool"/>
+			<Tool
+				Name="VCLibrarianTool"
+				OutputFile="$(OutDir)/libpng.lib"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+		<Configuration
+			Name="LIB ASM Debug|Win32"
+			OutputDirectory=".\Win32_LIB_ASM_Debug"
+			IntermediateDirectory=".\Win32_LIB_ASM_Debug"
+			ConfigurationType="4">
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..,..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;_DEBUG;DEBUG;PNG_DEBUG=1;PNG_USE_PNGVCRD;PNG_LIBPNG_SPECIALBUILD;_CRT_SECURE_NO_WARNINGS"
+				BasicRuntimeChecks="3"
+				RuntimeLibrary="3"
+				UsePrecompiledHeader="3"
+				PrecompiledHeaderThrough="png.h"
+				WarningLevel="3"
+				DebugInformationFormat="4"
+				CompileAs="0"/>
+			<Tool
+				Name="VCCustomBuildTool"/>
+			<Tool
+				Name="VCLibrarianTool"
+				OutputFile="$(OutDir)/libpngd.lib"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+	</Configurations>
+	<References>
+	</References>
+	<Files>
+		<Filter
+			Name="Source Files"
+			Filter="cpp;c;cxx;rc;def;r;odl;idl;hpj;bat">
+			<File
+				RelativePath="..\..\png.c">
+				<FileConfiguration
+					Name="DLL Release|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						UsePrecompiledHeader="0"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="DLL Debug|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						UsePrecompiledHeader="0"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="DLL ASM Release|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						UsePrecompiledHeader="0"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="DLL ASM Debug|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						UsePrecompiledHeader="0"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="DLL VB|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						UsePrecompiledHeader="0"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="LIB Release|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						UsePrecompiledHeader="0"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="LIB Debug|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						UsePrecompiledHeader="0"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="LIB ASM Release|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						UsePrecompiledHeader="0"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="LIB ASM Debug|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						UsePrecompiledHeader="0"/>
+				</FileConfiguration>
+			</File>
+			<File
+				RelativePath="..\..\pngerror.c">
+				<FileConfiguration
+					Name="DLL Release|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						UsePrecompiledHeader="1"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="DLL Debug|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						UsePrecompiledHeader="1"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="DLL ASM Release|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						UsePrecompiledHeader="1"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="DLL ASM Debug|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						UsePrecompiledHeader="1"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="DLL VB|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						UsePrecompiledHeader="1"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="LIB Release|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						UsePrecompiledHeader="1"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="LIB Debug|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						UsePrecompiledHeader="1"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="LIB ASM Release|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						UsePrecompiledHeader="1"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="LIB ASM Debug|Win32">
+					<Tool
+						Name="VCCLCompilerTool"
+						UsePrecompiledHeader="1"/>
+				</FileConfiguration>
+			</File>
+			<File
+				RelativePath="..\..\pngget.c">
+			</File>
+			<File
+				RelativePath="..\..\pngmem.c">
+			</File>
+			<File
+				RelativePath="..\..\pngpread.c">
+			</File>
+			<File
+				RelativePath="..\..\pngread.c">
+			</File>
+			<File
+				RelativePath="..\..\pngrio.c">
+			</File>
+			<File
+				RelativePath="..\..\pngrtran.c">
+			</File>
+			<File
+				RelativePath="..\..\pngrutil.c">
+			</File>
+			<File
+				RelativePath="..\..\pngset.c">
+			</File>
+			<File
+				RelativePath="..\..\pngtrans.c">
+			</File>
+			<File
+				RelativePath="..\..\scripts\pngw32.def">
+				<FileConfiguration
+					Name="DLL VB|Win32"
+					ExcludedFromBuild="TRUE">
+					<Tool
+						Name="VCCustomBuildTool"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="LIB Release|Win32"
+					ExcludedFromBuild="TRUE">
+					<Tool
+						Name="VCCustomBuildTool"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="LIB Debug|Win32"
+					ExcludedFromBuild="TRUE">
+					<Tool
+						Name="VCCustomBuildTool"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="LIB ASM Release|Win32"
+					ExcludedFromBuild="TRUE">
+					<Tool
+						Name="VCCustomBuildTool"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="LIB ASM Debug|Win32"
+					ExcludedFromBuild="TRUE">
+					<Tool
+						Name="VCCustomBuildTool"/>
+				</FileConfiguration>
+			</File>
+			<File
+				RelativePath="..\..\pngwio.c">
+			</File>
+			<File
+				RelativePath="..\..\pngwrite.c">
+			</File>
+			<File
+				RelativePath="..\..\pngwtran.c">
+			</File>
+			<File
+				RelativePath="..\..\pngwutil.c">
+			</File>
+		</Filter>
+		<Filter
+			Name="Header Files"
+			Filter="h;hpp;hxx;hm;inl">
+			<File
+				RelativePath="..\..\png.h">
+			</File>
+			<File
+				RelativePath="..\..\pngconf.h">
+			</File>
+		</Filter>
+		<Filter
+			Name="Resource Files"
+			Filter="ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe">
+			<File
+				RelativePath="..\..\scripts\pngw32.rc">
+				<FileConfiguration
+					Name="LIB Release|Win32"
+					ExcludedFromBuild="TRUE">
+					<Tool
+						Name="VCResourceCompilerTool"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="LIB Debug|Win32"
+					ExcludedFromBuild="TRUE">
+					<Tool
+						Name="VCResourceCompilerTool"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="LIB ASM Release|Win32"
+					ExcludedFromBuild="TRUE">
+					<Tool
+						Name="VCResourceCompilerTool"/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="LIB ASM Debug|Win32"
+					ExcludedFromBuild="TRUE">
+					<Tool
+						Name="VCResourceCompilerTool"/>
+				</FileConfiguration>
+			</File>
+		</Filter>
+		<File
+			RelativePath=".\PRJ0041.mak">
+			<FileConfiguration
+				Name="DLL Release|Win32">
+				<Tool
+					Name="VCCustomBuildTool"
+					Description="Create dummy include files to prevent &quot;Cannot find missing dependency...&quot; warnings."
+					CommandLine="nmake -f PRJ0041.mak IntDir=$(IntDir)"
+					Outputs="$(IntDir)\alloc.h;$(IntDir)\fp.h;$(IntDir)\m68881.h;$(IntDir)\mem.h;$(IntDir)\pngusr.h;$(IntDir)\strings.h;$(IntDir)\unistd.h;$(IntDir)\unixio.h"/>
+			</FileConfiguration>
+			<FileConfiguration
+				Name="DLL Debug|Win32">
+				<Tool
+					Name="VCCustomBuildTool"
+					Description="Create dummy include files to prevent &quot;Cannot find missing dependency...&quot; warnings."
+					CommandLine="nmake -f PRJ0041.mak IntDir=$(IntDir)"
+					Outputs="$(IntDir)\alloc.h;$(IntDir)\fp.h;$(IntDir)\m68881.h;$(IntDir)\mem.h;$(IntDir)\pngusr.h;$(IntDir)\strings.h;$(IntDir)\unistd.h;$(IntDir)\unixio.h"/>
+			</FileConfiguration>
+			<FileConfiguration
+				Name="DLL ASM Release|Win32">
+				<Tool
+					Name="VCCustomBuildTool"
+					Description="Create dummy include files to prevent &quot;Cannot find missing dependency...&quot; warnings."
+					CommandLine="nmake -f PRJ0041.mak IntDir=$(IntDir)"
+					Outputs="$(IntDir)\alloc.h;$(IntDir)\fp.h;$(IntDir)\m68881.h;$(IntDir)\mem.h;$(IntDir)\pngusr.h;$(IntDir)\strings.h;$(IntDir)\unistd.h;$(IntDir)\unixio.h"/>
+			</FileConfiguration>
+			<FileConfiguration
+				Name="DLL ASM Debug|Win32">
+				<Tool
+					Name="VCCustomBuildTool"
+					Description="Create dummy include files to prevent &quot;Cannot find missing dependency...&quot; warnings."
+					CommandLine="nmake -f PRJ0041.mak IntDir=$(IntDir)"
+					Outputs="$(IntDir)\alloc.h;$(IntDir)\fp.h;$(IntDir)\m68881.h;$(IntDir)\mem.h;$(IntDir)\pngusr.h;$(IntDir)\strings.h;$(IntDir)\unistd.h;$(IntDir)\unixio.h"/>
+			</FileConfiguration>
+			<FileConfiguration
+				Name="DLL VB|Win32">
+				<Tool
+					Name="VCCustomBuildTool"
+					Description="Create dummy include files to prevent &quot;Cannot find missing dependency...&quot; warnings."
+					CommandLine="nmake -f PRJ0041.mak IntDir=$(IntDir)"
+					Outputs="$(IntDir)\alloc.h;$(IntDir)\fp.h;$(IntDir)\m68881.h;$(IntDir)\mem.h;$(IntDir)\pngusr.h;$(IntDir)\strings.h;$(IntDir)\unistd.h;$(IntDir)\unixio.h"/>
+			</FileConfiguration>
+		</File>
+		<File
+			RelativePath="README.txt">
+		</File>
+	</Files>
+	<Globals>
+	</Globals>
+</VisualStudioProject>

projects/visualc71/pngtest.vcproj

@@ -0,0 +1,459 @@
+<?xml version="1.0" encoding="Windows-1252"?>
+<VisualStudioProject
+	ProjectType="Visual C++"
+	Version="7.10"
+	Name="pngtest"
+	RootNamespace="pngtest">
+	<Platforms>
+		<Platform
+			Name="Win32"/>
+	</Platforms>
+	<Configurations>
+		<Configuration
+			Name="DLL Release|Win32"
+			OutputDirectory=".\Win32_DLL_Release\Test"
+			IntermediateDirectory=".\Win32_DLL_Release\Test"
+			ConfigurationType="1">
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;NDEBUG;PNG_DLL;PNG_NO_STDIO;PNG_NO_GLOBAL_ARRAYS"
+				StringPooling="TRUE"
+				RuntimeLibrary="2"
+				EnableFunctionLevelLinking="TRUE"
+				WarningLevel="3"
+				CompileAs="0"/>
+			<Tool
+				Name="VCCustomBuildTool"
+				Description="Testing..."
+				CommandLine="set path=$(OutDir)\..;$(OutDir)\..\ZLib
+$(TargetPath) ..\..\pngtest.png $(IntDir)\pngout.png"
+				Outputs="$(IntDir)\pngout.png"/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)/pngtest.exe"
+				LinkIncremental="1"
+				SubSystem="1"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCWebDeploymentTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+		<Configuration
+			Name="DLL Debug|Win32"
+			OutputDirectory=".\Win32_DLL_Debug\Test"
+			IntermediateDirectory=".\Win32_DLL_Debug\Test"
+			ConfigurationType="1">
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;_DEBUG;PNG_DLL;PNG_NO_STDIO;PNG_NO_GLOBAL_ARRAYS"
+				BasicRuntimeChecks="3"
+				RuntimeLibrary="3"
+				WarningLevel="3"
+				DebugInformationFormat="4"
+				CompileAs="0"/>
+			<Tool
+				Name="VCCustomBuildTool"
+				Description="Testing..."
+				CommandLine="set path=$(OutDir)\..;$(OutDir)\..\ZLib
+$(TargetPath) ..\..\pngtest.png $(IntDir)\pngout.png"
+				Outputs="$(IntDir)\pngout.png"/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)/pngtest.exe"
+				GenerateDebugInformation="TRUE"
+				SubSystem="1"
+				TargetMachine="1"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCWebDeploymentTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+		<Configuration
+			Name="DLL ASM Release|Win32"
+			OutputDirectory=".\Win32_DLL_ASM_Release\Test"
+			IntermediateDirectory=".\Win32_DLL_ASM_Release\Test"
+			ConfigurationType="1">
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;NDEBUG;PNG_DLL;PNG_NO_STDIO;PNG_NO_GLOBAL_ARRAYS"
+				StringPooling="TRUE"
+				RuntimeLibrary="2"
+				EnableFunctionLevelLinking="TRUE"
+				WarningLevel="3"
+				CompileAs="0"/>
+			<Tool
+				Name="VCCustomBuildTool"
+				Description="Testing..."
+				CommandLine="set path=$(OutDir)\..;$(OutDir)\..\ZLib
+$(TargetPath) ..\..\pngtest.png $(IntDir)\pngout.png"
+				Outputs="$(IntDir)\pngout.png"/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)/pngtest.exe"
+				LinkIncremental="1"
+				SubSystem="1"
+				TargetMachine="1"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCWebDeploymentTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+		<Configuration
+			Name="DLL ASM Debug|Win32"
+			OutputDirectory=".\Win32_DLL_ASM_Debug\Test"
+			IntermediateDirectory=".\Win32_DLL_ASM_Debug\Test"
+			ConfigurationType="1">
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;_DEBUG;PNG_DLL;PNG_NO_STDIO;PNG_NO_GLOBAL_ARRAYS"
+				BasicRuntimeChecks="3"
+				RuntimeLibrary="3"
+				WarningLevel="3"
+				DebugInformationFormat="4"
+				CompileAs="0"/>
+			<Tool
+				Name="VCCustomBuildTool"
+				Description="Testing..."
+				CommandLine="set path=$(OutDir)\..;$(OutDir)\..\ZLib
+$(TargetPath) ..\..\pngtest.png $(IntDir)\pngout.png"
+				Outputs="$(IntDir)\pngout.png"/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)/pngtest.exe"
+				GenerateDebugInformation="TRUE"
+				SubSystem="1"
+				TargetMachine="1"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCWebDeploymentTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+		<Configuration
+			Name="DLL VB|Win32"
+			OutputDirectory=".\Win32_DLL_VB\Test"
+			IntermediateDirectory=".\Win32_DLL_VB\Test"
+			ConfigurationType="1">
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;NDEBUG;PNG_DLL;PNG_NO_STDIO;PNG_NO_GLOBAL_ARRAYS;PNGAPI=__stdcall"
+				StringPooling="TRUE"
+				RuntimeLibrary="2"
+				EnableFunctionLevelLinking="TRUE"
+				WarningLevel="2"
+				CallingConvention="2"
+				CompileAs="0"/>
+			<Tool
+				Name="VCCustomBuildTool"
+				Description="Testing..."
+				CommandLine="set path=$(OutDir)\..;$(OutDir)\..\..\Win32_DLL_Release\ZLib
+$(TargetPath) ..\..\pngtest.png $(IntDir)\pngout.png"
+				Outputs="$(IntDir)\pngout.png"/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)/pngtest.exe"
+				LinkIncremental="1"
+				IgnoreDefaultLibraryNames="$(IntDir)\libpng10vb.lib"
+				SubSystem="1"
+				TargetMachine="1"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCWebDeploymentTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+		<Configuration
+			Name="LIB Release|Win32"
+			OutputDirectory=".\Win32_LIB_Release\Test"
+			IntermediateDirectory=".\Win32_LIB_Release\Test"
+			ConfigurationType="1">
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;_DEBUG;PNG_NO_GLOBAL_ARRAYS"
+				StringPooling="TRUE"
+				RuntimeLibrary="2"
+				EnableFunctionLevelLinking="TRUE"
+				WarningLevel="3"
+				CompileAs="0"/>
+			<Tool
+				Name="VCCustomBuildTool"
+				Description="Testing..."
+				CommandLine="set path=$(OutDir)\..;$(OutDir)\..\ZLib
+$(TargetPath) ..\..\pngtest.png $(IntDir)\pngout.png"
+				Outputs="$(IntDir)\pngout.png"/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)/pngtest.exe"
+				LinkIncremental="1"
+				SubSystem="1"
+				TargetMachine="1"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCWebDeploymentTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+		<Configuration
+			Name="LIB Debug|Win32"
+			OutputDirectory=".\Win32_LIB_Debug\Test"
+			IntermediateDirectory=".\Win32_LIB_Debug\Test"
+			ConfigurationType="1">
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;_DEBUG;PNG_NO_GLOBAL_ARRAYS"
+				BasicRuntimeChecks="3"
+				RuntimeLibrary="3"
+				WarningLevel="3"
+				DebugInformationFormat="4"
+				CompileAs="0"/>
+			<Tool
+				Name="VCCustomBuildTool"
+				Description="Testing..."
+				CommandLine="set path=$(OutDir)\..;$(OutDir)\..\ZLib
+$(TargetPath) ..\..\pngtest.png $(IntDir)\pngout.png"
+				Outputs="$(IntDir)\pngout.png"/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)/pngtest.exe"
+				GenerateDebugInformation="TRUE"
+				SubSystem="1"
+				TargetMachine="1"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCWebDeploymentTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+		<Configuration
+			Name="LIB ASM Release|Win32"
+			OutputDirectory=".\Win32_LIB_ASM_Release\Test"
+			IntermediateDirectory=".\Win32_LIB_ASM_Release\Test"
+			ConfigurationType="1">
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;NDEBUG;PNG_NO_GLOBAL_ARRAYS"
+				StringPooling="TRUE"
+				RuntimeLibrary="2"
+				EnableFunctionLevelLinking="TRUE"
+				WarningLevel="3"
+				CompileAs="0"/>
+			<Tool
+				Name="VCCustomBuildTool"
+				Description="Testing..."
+				CommandLine="set path=$(OutDir)\..;$(OutDir)\..\ZLib
+$(TargetPath) ..\..\pngtest.png $(IntDir)\pngout.png"
+				Outputs="$(IntDir)\pngout.png"/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)/pngtest.exe"
+				LinkIncremental="1"
+				SubSystem="1"
+				TargetMachine="1"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCWebDeploymentTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+		<Configuration
+			Name="LIB ASM Debug|Win32"
+			OutputDirectory=".\Win32_LIB_ASM_Debug\Test"
+			IntermediateDirectory=".\Win32_LIB_ASM_Debug\Test"
+			ConfigurationType="1">
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..\..\..\zlib"
+				PreprocessorDefinitions="WIN32;_DEBUG;PNG_NO_GLOBAL_ARRAYS"
+				BasicRuntimeChecks="3"
+				RuntimeLibrary="3"
+				WarningLevel="3"
+				DebugInformationFormat="4"
+				CompileAs="0"/>
+			<Tool
+				Name="VCCustomBuildTool"
+				Description="Testing..."
+				CommandLine="set path=$(OutDir)\..;$(OutDir)\..\ZLib
+$(TargetPath) ..\..\pngtest.png $(IntDir)\pngout.png"
+				Outputs="$(IntDir)\pngout.png"/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="$(OutDir)/pngtest.exe"
+				GenerateDebugInformation="TRUE"
+				SubSystem="1"
+				TargetMachine="1"/>
+			<Tool
+				Name="VCMIDLTool"/>
+			<Tool
+				Name="VCPostBuildEventTool"/>
+			<Tool
+				Name="VCPreBuildEventTool"/>
+			<Tool
+				Name="VCPreLinkEventTool"/>
+			<Tool
+				Name="VCResourceCompilerTool"/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"/>
+			<Tool
+				Name="VCWebDeploymentTool"/>
+			<Tool
+				Name="VCManagedWrapperGeneratorTool"/>
+			<Tool
+				Name="VCAuxiliaryManagedWrapperGeneratorTool"/>
+		</Configuration>
+	</Configurations>
+	<References>
+	</References>
+	<Files>
+		<Filter
+			Name="Source Files"
+			Filter="cpp;c;cxx;rc;def;r;odl;idl;hpj;bat">
+			<File
+				RelativePath="..\..\pngtest.c">
+			</File>
+		</Filter>
+	</Files>
+	<Globals>
+	</Globals>
+</VisualStudioProject>