Imported from libpng-1.2.1beta3.tar

ANNOUNCE

@@ -1,77 +1,23 @@
 
-Libpng 1.0.7beta13 - May 16, 2000
+Libpng 1.2.1beta3 - October 27, 2001
 
-This is a public release of libpng, intended for use in production codes.
+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.
 
-Changes since the last public release (1.0.6):
+Changes since the last public release (1.2.0):
 
-  Changed sprintf() to strcpy() in png_write_sCAL_s() to work without STDIO
-  Added data_length parameter to png_decompress_chunk() function
-  Revised documentation to remove reference to abandoned png_free_chnk functions
-  Fixed an error in png_rgb_to_gray_fixed()
-  Revised example.c, usage of png_destroy_write_struct().
-  Renamed makefile.ibmvac3 to makefile.ibmc, added libpng.icc IBM project file
-  Added a check for info_ptr->free_me&PNG_FREE_TEXT when free'ing text in png.c
-  Simplify png_sig_bytes() function to remove use of non-ISO-C strdup().
-  Added png_data_freer() function.
-  In the code that checks for over-length tRNS chunks, added check of
-    info_ptr->num_trans as well as png_ptr->num_trans (Matthias Benckmann)
-  Check for existing data and free it if the free_me flag is set, in png_set_*()
-    and png_handle_*().
-  Only define PNG_WEIGHTED_FILTERS_SUPPORTED when PNG_FLOATING_POINT_SUPPORTED
-    is defined.
-  Changed several instances of PNG_NO_CONSOLE_ID to PNG_NO_STDIO in pngrutil.c
-    and mentioned the purposes of the two macros in libpng.txt/libpng.3.
-  Revised png_set_iCCP() and png_set_rows() to avoid prematurely freeing data.
-  Add checks in png_set_text() for NULL members of the input text structure.
-  Removed superfluous prototype for png_set_itxt from png.h
-  Removed "else" from pngread.c, after png_error(), and changed "0" to "length".
-  Changed several png_errors about malformed ancillary chunks to png_warnings.
-  Added png_pass-* arrays to pnggccrd.c when PNG_USE_LOCAL_ARRAYS is defined.
-  Relocated paragraph about png_set_background() in libpng.3/libpng.txt
-    and other revisions (Matthias Benckmann)
-  Relocated info_ptr->free_me to restore binary compatibility with libpng-1.0.5
-    (breaks compatibility with libpng-1.0.6).
-  Relocated info_ptr->free_me, png_ptr->free_me, and other info_ptr and
-    png_ptr members to restore binary compatibility with libpng-1.0.5
-    (breaks compatibility with libpng-1.0.6).
-  Rearranged some members at the end of png_info and png_struct, to put
-    unknown_chunks_num and free_me within the original size of the png_structs
-    and free_me, png_read_user_fn, and png_free_fn within the original png_info,
-    because some old applications allocate the structs directly instead of
-    using png_create_*().
-  Added documentation of user memory functions in libpng.txt/libpng.3
-  Modified png_read_png so that it will use user_allocated row_pointers
-    if present, unless free_me directs that it be freed, and added description
-    of the use of png_set_rows() and png_get_rows() in libpng.txt/libpng.3.
-  Added PNG_LEGACY_SUPPORTED macro, and #ifdef out all new (since version
-    1.00) members of png_struct and png_info, to regain binary compatibility
-    when you define this macro.  Capabilities lost in this event
-    are user transforms (new in version 1.0.0),the user transform pointer
-    (new in version 1.0.2), rgb_to_gray (new in 1.0.5), iCCP, sCAL, sPLT,
-    the high-level interface, and unknown chunks support (all new in 1.0.6).
-    This was necessary because of old applications that allocate the structs
-    directly as authors were instructed to do in libpng-0.88 and earlier,
-    instead of using png_create_*(). 
-  Added makefile.intel and updated makefile.watcom (Pawel Mrochen)
-  Overloaded png_read_init() and png_write_init() with macros that convert
-    calls to png_read_init_2() or png_write_init_2() that check the version
-    and structure sizes.
-  Made PNG_NO_ITXT_SUPPORTED the default setting, to avoid memory overrun
-    when old applications fill the info_ptr->text structure directly.
-  Added PNGAPI macro, and added it to the definitions of all exported functions.
-  Made PNG_NO_CONSOLE_IO the default condition when PNG_BUILD_DLL is defined.
-  Use MSC _RPTn debugging instead of fprintf if _MSC_VER is defined.
-  Added png_access_version_number() function.
-  Check for mask&PNG_FREE_CHNK (for TEXT, SCAL, PCAL) in png_free_data().
-  Expanded libpng.3/libpng.txt information about png_data_freer().
-  Changed pnggccrd.c and pngvcrd.c to handle bad adaptive filter types as
-    warnings instead of errors, as pngrutil.c does.
-  Set the PNG_INFO_IDAT valid flag in png_set_rows() so png_write_png()
-    will actually write IDATs.
-  Made the default PNG_USE_LOCAL_ARRAYS depend on PNG_DLL instead of WIN32.
-  Make png_free_data() ignore its final parameter when freeing data that can
-    have multiple instances (text, sPLT, unknowns).
+version 1.2.1beta1 [October 19, 2001]
+  Revised makefile.std in contrib/pngminus
+  Include background_1 in png_struct regardless of gamma support.
+  Revised makefile.netbsd and makefile.macosx, added makefile.darwin.
+  Revised example.c to provide more details about using row_callback().
+version 1.2.1beta2 [October 25, 2001]
+  Added type cast to each NULL appearing in a function call, except for
+    WINCE functions.
+  Added makefile.so9.
+version 1.2.1beta3 [October 27, 2001]
+  Removed type casts from all NULLs.
+  Simplified png_create_struct_2().
 
 Send comments/corrections/commendations to
 png-implement@ccrc.wustl.edu or to randeg@alum.rpi.edu

CHANGES

@@ -1,3 +1,4 @@
+
 CHANGES - changes for libpng
 
 version 0.2
@@ -379,7 +380,7 @@ version 1.0.2a [December 30, 1998]
   Changed "ln -sf" to "ln -s -f" in makefile.s2x, makefile.lnx, and makefile.sco.
   Removed lines after Dynamic Dependencies" in makefile.aco .
   Revised makefile.dec to make a shared library (Jeremie Petit).
-  Removed trailing blanks from all files. 
+  Removed trailing blanks from all files.
 version 1.0.2a [January 6, 1999]
   Removed misplaced #endif and #ifdef PNG_NO_EXTERN near the end of png.h
   Added "if" tests to silence complaints about unused png_ptr in png.h and png.c
@@ -392,7 +393,7 @@ version 1.0.3 [January 14, 1999]
 version 1.0.3a [August 12, 1999]
   Added check for PNG_READ_INTERLACE_SUPPORTED in pngread.c; issue a warning
      if an attempt is made to read an interlaced image when it's not supported.
-  Added check if png_ptr->trans is defined before free'ing it in pngread.c
+  Added check if png_ptr->trans is defined before freeing it in pngread.c
   Modified the Y2K statement to include versions back to version 0.71
   Fixed a bug in the check for valid IHDR bit_depth/color_types in pngrutil.c
   Modified makefile.wat (added -zp8 flag, ".symbolic", changed some comments)
@@ -669,7 +670,7 @@ version 1.0.6d [April 7, 2000]
   Fixed an error in png_rgb_to_gray_fixed()
   Revised example.c, usage of png_destroy_write_struct().
   Renamed makefile.ibmvac3 to makefile.ibmc, added libpng.icc IBM project file
-  Added a check for info_ptr->free_me&PNG_FREE_TEXT when free'ing text in png.c
+  Added a check for info_ptr->free_me&PNG_FREE_TEXT when freeing text in png.c
   Simplify png_sig_bytes() function to remove use of non-ISO-C strdup().
 version 1.0.6e [April 9, 2000]
   Added png_data_freer() function.
@@ -718,7 +719,7 @@ version 1.0.6i [May 2, 2000]
     the high-level interface, and unknown chunks support (all new in 1.0.6).
     This was necessary because of old applications that allocate the structs
     directly as authors were instructed to do in libpng-0.88 and earlier,
-    instead of using png_create_*(). 
+    instead of using png_create_*().
   Added modes PNG_CREATED_READ_STRUCT and PNG_CREATED_WRITE_STRUCT which
     can be used to detect codes that directly allocate the structs, and
     code to check these modes in png_read_init() and png_write_init() and
@@ -732,11 +733,14 @@ version 1.0.6j [May 3, 2000]
 version 1.0.7beta11 [May 7, 2000]
   Removed the new PNG_CREATED_READ_STRUCT and PNG_CREATED_WRITE_STRUCT modes
     which are no longer used.
-  Eliminated the three new members of png_text when PNG_NO_iTXt_SUPPORTED
-    or PNG_LEGACY_SUPPORTED is defined.
-  Made PNG_NO_ITXT_SUPPORTED the default setting, to avoid memory overrun
-    when old applications fill the info_ptr->text structure directly.
+  Eliminated the three new members of png_text when PNG_LEGACY_SUPPORTED is
+    defined or when neither PNG_READ_iTXt_SUPPORTED nor PNG_WRITE_iTXT_SUPPORTED
+    is defined.
+  Made PNG_NO_READ|WRITE_iTXt the default setting, to avoid memory
+    overrun when old applications fill the info_ptr->text structure directly.
   Added PNGAPI macro, and added it to the definitions of all exported functions.
+  Relocated version macro definitions ahead of the includes of zlib.h and
+    pngconf.h in png.h.
 version 1.0.7beta12 [May 12, 2000]
   Revised pngset.c to avoid a problem with expanding the png_debug macro.
   Deleted some extraneous defines from pngconf.h
@@ -745,14 +749,250 @@ version 1.0.7beta12 [May 12, 2000]
   Added png_access_version_number() function.
   Check for mask&PNG_FREE_CHNK (for TEXT, SCAL, PCAL) in png_free_data().
   Expanded libpng.3/libpng.txt information about png_data_freer().
-version 1.0.7beta13 [May 16, 2000]
+version 1.0.7beta14 [May 17, 2000] (beta13 was not published)
   Changed pnggccrd.c and pngvcrd.c to handle bad adaptive filter types as
     warnings instead of errors, as pngrutil.c does.
   Set the PNG_INFO_IDAT valid flag in png_set_rows() so png_write_png()
     will actually write IDATs.
   Made the default PNG_USE_LOCAL_ARRAYS depend on PNG_DLL instead of WIN32.
-  Make png_free_data() ignore its final parameter when freeing data that can
-    have multiple instances (text, sPLT, unknowns).
+  Make png_free_data() ignore its final parameter except when freeing data
+    that can have multiple instances (text, sPLT, unknowns).
+  Fixed a new bug in png_set_rows().
+  Removed info_ptr->valid tests from png_free_data(), as in version 1.0.5.
+  Added png_set_invalid() function.
+  Fixed incorrect illustrations of png_destroy_write_struct() in example.c.
+version 1.0.7beta15 [May 30, 2000]
+  Revised the deliberately erroneous Linux setjmp code in pngconf.h to produce
+    fewer error messages.
+  Rearranged checks for Z_OK to check the most likely path first in pngpread.c
+    and pngwutil.c.
+  Added checks in pngtest.c for png_create_*() returning NULL, and mentioned
+    in libpng.txt/libpng.3 the need for applications to check this.
+  Changed names of png_default_*() functions in pngtest to pngtest_*().
+  Changed return type of png_get_x|y_offset_*() from png_uint_32 to png_int_32.
+  Fixed some bugs in the unused PNG_INCH_CONVERSIONS functions in pngget.c
+  Set each pointer to NULL after freeing it in png_free_data().
+  Worked around a problem in pngconf.h; AIX's strings.h defines an "index"
+    macro that conflicts with libpng's png_color_16.index. (Dimitri Papadapoulos)
+  Added "msvc" directory with MSVC++ project files (Simon-Pierre Cadieux).
+version 1.0.7beta16 [June 4, 2000]
+  Revised the workaround of AIX string.h "index" bug.
+  Added a check for overlength PLTE chunk in pngrutil.c.
+  Added PNG_NO_POINTER_INDEXING macro to use array-indexing instead of pointer
+    indexing in pngrutil.c and pngwutil.c to accommodate a buggy compiler.
+  Added a warning in png_decompress_chunk() when it runs out of data, e.g.
+    when it tries to read an erroneous PhotoShop iCCP chunk.
+  Added PNG_USE_DLL macro.
+  Revised the copyright/disclaimer/license notice.
+  Added contrib/msvctest directory
+version 1.0.7rc1 [June 9, 2000]
+  Corrected the definition of PNG_TRANSFORM_INVERT_ALPHA  (0x0400 not 0x0200)
+  Added contrib/visupng directory (Willem van Schaik)
+version 1.0.7beta18 [June 23, 2000]
+  Revised PNGAPI definition, and pngvcrd.c to work with __GCC__
+    and do not redefine PNGAPI if it is passed in via a compiler directive.
+  Revised visupng/PngFile.c to remove returns from within the Try block.
+  Removed leading underscores from "_PNG_H" and "_PNG_SAVE_BSD_SOURCE" macros.
+  Updated contrib/visupng/cexcept.h to version 1.0.0.
+  Fixed bugs in pngwrite.c and pngwutil.c that prevented writing iCCP chunks.
+version 1.0.7rc2 [June 28, 2000]
+  Updated license to include disclaimers required by UCITA.
+  Fixed "DJBPP" typo in pnggccrd.c introduced in beta18.
+version 1.0.7 [July 1, 2000]
+  Revised the definition of "trans_values" in libpng.3/libpng.txt
+version 1.0.8beta1 [July 8, 2000]
+  Added png_free(png_ptr, key) two places in pngpread.c to stop memory leaks.
+  Changed PNG_NO_STDIO to PNG_NO_CONSOLE_IO, several places in pngrutil.c and
+     pngwutil.c.
+  Changed PNG_EXPORT_VAR to use PNG_IMPEXP, in pngconf.h.
+  Removed unused "#include <assert.h>" from png.c
+  Added WindowsCE support.
+  Revised pnggccrd.c to work with gcc-2.95.2 and in the Cygwin environment.
+version 1.0.8beta2 [July 10, 2000]
+  Added project files to the wince directory and made further revisions
+     of pngtest.c, pngrio.c, and pngwio.c in support of WindowsCE.
+version 1.0.8beta3 [July 11, 2000]
+  Only set the PNG_FLAG_FREE_TRNS or PNG_FREE_TRNS flag in png_handle_tRNS()
+     for indexed-color input files to avoid potential double-freeing trans array
+     under some unusual conditions; problem was introduced in version 1.0.6f.
+  Further revisions to pngtest.c and files in the wince subdirectory.
+version 1.0.8beta4 [July 14, 2000]
+  Added the files pngbar.png and pngbar.jpg to the distribution.
+  Added makefile.cygwin, and cygwin support in pngconf.h
+  Added PNG_NO_ZALLOC_ZERO macro (makes png_zalloc skip zeroing memory)
+version 1.0.8rc1 [July 16, 2000]
+  Revised png_debug() macros and statements to eliminate compiler warnings.
+version 1.0.8 [July 24, 2000]
+  Added png_flush() in pngwrite.c, after png_write_IEND().
+  Updated makefile.hpux to build a shared library.
+version 1.0.9beta1 [November 10, 2000]
+  Fixed typo in scripts/makefile.hpux
+  Updated makevms.com in scripts and contrib/* and contrib/* (Martin Zinser)
+  Fixed seqence-point bug in contrib/pngminus/png2pnm (Martin Zinser)
+  Changed "cdrom.com" in documentation to "libpng.org"
+  Revised pnggccrd.c to get it all working, and updated makefile.gcmmx (Greg).
+  Changed type of "params" from voidp to png_voidp in png_read|write_png().
+  Make sure PNGAPI and PNG_IMPEXP are defined in pngconf.h.
+  Revised the 3 instances of WRITEFILE in pngtest.c.
+  Relocated "msvc" and "wince" project subdirectories into "dll" subdirectory.
+  Updated png.rc in dll/msvc project
+  Revised makefile.dec to define and use LIBPATH and INCPATH
+  Increased size of global png_libpng_ver[] array from 12 to 18 chars.
+  Made global png_libpng_ver[], png_sig[] and png_pass_*[] arrays const.
+  Removed duplicate png_crc_finish() from png_handle_bKGD() function.
+  Added a warning when application calls png_read_update_info() multiple times.
+  Revised makefile.cygwin
+  Fixed bugs in iCCP support in pngrutil.c and pngwutil.c.
+  Replaced png_set_empty_plte_permitted() with png_permit_mng_features().
+version 1.0.9beta2 [November 19, 2000]
+  Renamed the "dll" subdirectory "projects".
+  Added borland project files to "projects" subdirectory.
+  Set VS_FF_PRERELEASE and VS_FF_PATCHED flags in msvc/png.rc when appropriate.
+  Add error message in png_set_compression_buffer_size() when malloc fails.
+version 1.0.9beta3 [November 23, 2000]
+  Revised PNG_LIBPNG_BUILD_TYPE macro in png.h, used in the msvc project.
+  Removed the png_flush() in pngwrite.c that crashes some applications
+    that don't set png_output_flush_fn.
+  Added makefile.macosx and makefile.aix to scripts directory.
+version 1.0.9beta4 [December 1, 2000]
+  Change png_chunk_warning to png_warning in png_check_keyword().
+  Increased the first part of msg buffer from 16 to 18 in png_chunk_error().
+version 1.0.9beta5 [December 15, 2000]
+  Added support for filter method 64 (for PNG datastreams embedded in MNG).
+version 1.0.9beta6 [December 18, 2000]
+  Revised png_set_filter() to accept filter method 64 when appropriate.
+  Added new PNG_HAVE_PNG_SIGNATURE bit to png_ptr->mode and use it to
+    help prevent applications from using MNG features in PNG datastreams.
+  Added png_permit_mng_features() function.
+  Revised libpng.3/libpng.txt.  Changed "filter type" to "filter method".
+version 1.0.9rc1 [December 23, 2000]
+  Revised test for PNG_HAVE_PNG_SIGNATURE in pngrutil.c
+  Fixed error handling of unknown compression type in png_decompress_chunk().
+  In pngconf.h, define __cdecl when _MSC_VER is defined.
+version 1.0.9beta7 [December 28, 2000]
+  Changed PNG_TEXT_COMPRESSION_zTXt to PNG_COMPRESSION_TYPE_BASE several places.
+  Revised memory management in png_set_hIST and png_handle_hIST in a backward
+    compatible manner.  PLTE and tRNS were revised similarly.
+  Revised the iCCP chunk reader to ignore trailing garbage.
+version 1.0.9beta8 [January 12, 2001]
+  Moved pngasmrd.h into pngconf.h.
+  Improved handling of out-of-spec garbage iCCP chunks generated by PhotoShop.
+version 1.0.9beta9 [January 15, 2001]
+  Added png_set_invalid, png_permit_mng_features, and png_mmx_supported to
+    wince and msvc project module definition files.
+  Minor revision of makefile.cygwin.
+  Fixed bug with progressive reading of narrow interlaced images in pngpread.c
+version 1.0.9beta10 [January 16, 2001]
+  Do not typedef png_FILE_p in pngconf.h when PNG_NO_STDIO is defined.
+  Fixed "png_mmx_supported" typo in project definition files.
+version 1.0.9beta11 [January 19, 2001]
+  Updated makefile.sgi to make shared library.
+  Removed png_mmx_support() function and disabled PNG_MNG_FEATURES_SUPPORTED
+    by default, for the benefit of DLL forward compatibility.  These will
+    be re-enabled in version 1.2.0.
+version 1.0.9rc2 [January 22, 2001]
+  Revised cygwin support.
+version 1.0.9 [January 31, 2001]
+  Added check of cygwin's ALL_STATIC in pngconf.h
+  Added "-nommx" parameter to contrib/gregbook/rpng2-win and rpng2-x demos.
+version 1.0.10beta1 [March 14, 2001]
+  Revised makefile.dec, makefile.sgi, and makefile.sggcc; added makefile.hpgcc.
+  Reformatted libpng.3 to eliminate bad line breaks.
+  Added checks for _mmx_supported in the read_filter_row function of pnggccrd.c
+  Added prototype for png_mmx_support() near the top of pnggccrd.c
+  Moved some error checking from png_handle_IHDR to png_set_IHDR.
+  Added PNG_NO_READ_SUPPORTED and PNG_NO_WRITE_SUPPORTED macros.
+  Revised png_mmx_support() function in pnggccrd.c
+  Restored version 1.0.8 PNG_WRITE_EMPTY_PLTE_SUPPORTED behavior in pngwutil.c
+  Fixed memory leak in contrib/visupng/PngFile.c
+  Fixed bugs in png_combine_row() in pnggccrd.c and pngvcrd.c (C version)
+  Added warnings when retrieving or setting gamma=0.
+  Increased the first part of msg buffer from 16 to 18 in png_chunk_warning().
+version 1.0.10rc1 [March 23, 2001]
+  Changed all instances of memcpy, strcpy, and strlen to png_memcpy, png_strcpy,
+    and png_strlen.
+  Revised png_mmx_supported() function in pnggccrd.c to return proper value.
+  Fixed bug in progressive reading (pngpread.c) with small images (height < 8).
+version 1.0.10 [March 30, 2001]
+  Deleted extraneous space (introduced in 1.0.9) from line 42 of makefile.cygwin
+  Added beos project files (Chris Herborth)
+version 1.0.11beta1 [April 3, 2001]
+  Added type casts on several png_malloc() calls (Dimitri Papadapoulos).
+  Removed a no-longer needed AIX work-around from pngconf.h
+  Changed several "//" single-line comments to C-style in pnggccrd.c
+version 1.0.11beta2 [April 11, 2001]
+  Removed PNGAPI from several functions whose prototypes did not have PNGAPI.
+  Updated scripts/pngos2.def
+version 1.0.11beta3 [April 14, 2001]
+  Added checking the results of many instances of png_malloc() for NULL
+version 1.0.11beta4 [April 20, 2001]
+  Undid the changes from version 1.0.11beta3.  Added a check for NULL return
+    from user's malloc_fn().
+  Removed some useless type casts of the NULL pointer.
+  Added makefile.netbsd
+version 1.0.11 [April 27, 2001]
+  Revised makefile.netbsd
+version 1.0.12beta1 [May 14, 2001]
+  Test for Windows platform in pngconf.h when including malloc.h (Emmanuel Blot)
+  Updated makefile.cygwin and handling of Cygwin's ALL_STATIC in pngconf.h
+  Added some never-to-be-executed code in pnggccrd.c to quiet compiler warnings.
+  Eliminated the png_error about apps using png_read|write_init().  Instead,
+    libpng will reallocate the png_struct and info_struct if they are too small.
+    This retains future binary compatibility for old applications written for
+    libpng-0.88 and earlier.
+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
+  Use png_malloc instead of png_zalloc to allocate palette in pngset.c
+  Updated makefile.ibmc
+  Added some typecasts to eliminate gcc 3.0 warnings.  Changed prototypes
+     of png_write_oFFS width and height from png_uint_32 to png_int_32.
+  Updated example.c
+  Revised prototypes for png_debug_malloc and png_debug_free in pngtest.c
+version 1.2.0beta5 [August 8, 2001]
+  Revised contrib/gregbook
+  Revised makefile.gcmmx
+  Revised pnggccrd.c to conditionally compile some thread-unsafe code only
+     when PNG_THREAD_UNSAFE_OK is defined.
+  Added tests to prevent pngwutil.c from writing a bKGD or tRNS chunk with
+     value exceeding 2^bit_depth-1
+  Revised makefile.sgi and makefile.sggcc
+  Replaced calls to fprintf(stderr,...) with png_warning() in pnggccrd.c
+  Removed restriction that do_invert_mono only operate on 1-bit opaque files
+version 1.2.0 [September 1, 2001]
+  Changed a png_warning() to png_debug() in pnggccrd.c
+  Fixed contrib/gregbook/rpng-x.c, rpng2-x.c to avoid crash with XFreeGC().
+version 1.2.1beta1 [October 19, 2001]
+  Revised makefile.std in contrib/pngminus
+  Include background_1 in png_struct regardless of gamma support.
+  Revised makefile.netbsd and makefile.macosx, added makefile.darwin.
+  Revised example.c to provide more details about using row_callback().
+version 1.2.1beta2 [October 25, 2001]
+  Added type cast to each NULL appearing in a function call, except for
+    WINCE functions.
+  Added makefile.so9.
+version 1.2.1beta3 [October 27, 2001]
+  Removed type casts from all NULLs.
+  Simplified png_create_struct_2().
 
 Send comments/corrections/commendations to
 png-implement@ccrc.wustl.edu or to randeg@alum.rpi.edu

INSTALL

@@ -1,5 +1,5 @@
 
-Installing libpng version 1.0.7beta13 - May 16, 2000
+Installing libpng version 1.2.1beta3 - October 27, 2001
 
 Before installing libpng, you must first install zlib.  zlib
 can usually be found wherever you got libpng.  zlib can be
@@ -10,7 +10,7 @@ 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-1.0.7beta13" or "lpng106" and "zlib-1.1.3"
+might be called "libpng-1.2.1beta3" or "lpng109" and "zlib-1.1.3"
 or "zlib113") so that you have directories called "zlib" and "libpng".
 
 Your directory structure should look like this:
@@ -23,8 +23,16 @@ Your directory structure should look like this:
           *.c
           contrib
              gregbook
+             msvctest
              pngminus
              pngsuite
+             visupng
+          projects
+             beos
+             borland
+             msvc
+             netware.txt
+             wince.txt
           scripts
              makefile.*
           pngtest.png
@@ -40,29 +48,43 @@ 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.
 
-First 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.  
+If you are building libpng with MSVC, you can enter the libpng\msvc directory
+and follow the instructions in msvc\README.txt.
+
+You can build libpng for WindowsCE by entering the downloading and installing
+the libpng\wince directory as instructed in the projects\wince.txt file, and
+then following the instructions in the README* files.  Similarly, you can
+build libpng for Netware as instructed in projects\netware.txt.
+
+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.
+
 The files that are presently available in the scripts directory
 include
 
  makefile.std      =>  Generic UNIX makefile (cc, creates static libpng.a)
- makefile.linux    =>  Linux/ELF makefile (gcc, creates libpng.so.2.1.0.7beta13)
- makefile.gcmmx    =>  Linux/ELF makefile (gcc, creates libpng.so.2.1.0.7beta13,
+ makefile.linux    =>  Linux/ELF makefile (gcc, creates libpng.so.2.1.2.1beta3)
+ makefile.gcmmx    =>  Linux/ELF makefile (gcc, creates libpng.so.2.1.2.1beta3,
                        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
                        ansi2knr (Requires ansi2knr.c from
                        ftp://ftp.cs.wisc.edu/ghost)
+ makefile.aix      =>  AIX makefile
+ makefile.cygwin   =>  Cygwin/gcc makefile
  makefile.dec      =>  DEC Alpha UNIX makefile
+ makefile.hpgcc    =>  HPUX makefile using gcc
  makefile.hpux     =>  HPUX (10.20 and 11.00) makefile
  makefile.ibmc     =>  IBM C/C++ version 3.x for Win32 and OS/2 (static)
  makefile.intel    =>  Intel C/C++ version 4.0 and later
  libpng.icc        =>  Project file for IBM VisualAge/C++ version 4.0 or later
+ makefile.macosx   =>  MACOS X Makefile
+ makefile.netbsd   =>  NetBSD/cc makefile, uses PNGGCCRD
  makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
- makefile.sggcc    =>  Silicon Graphics (gcc, creates libpng.so.2.1.0.7beta13)
+ makefile.sggcc    =>  Silicon Graphics (gcc, creates libpng.so.2.1.2.1beta3)
  makefile.sunos    =>  Sun makefile
- makefile.solaris  =>  Solaris 2.X makefile (gcc, creates libpng.so.2.1.0.7beta13)
+ makefile.solaris  =>  Solaris 2.X makefile (gcc, creates libpng.so.2.1.2.1beta3)
  makefile.sco      =>  For SCO OSr5  ELF and Unixware 7 with Native cc
  makefile.mips     =>  MIPS makefile
  makefile.acorn    =>  Acorn makefile
@@ -115,5 +137,5 @@ put the library in its final resting place (if you want to
 do that, run "make install" in the zlib directory first if necessary).
 
 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.
+files, in the individual makefiles, in png.h, in the README files in
+subdirectories of the LIB directory, and the manual pages libpng.3 and png.5.

KNOWNBUG

@@ -1,132 +1,8 @@
 
-Known bugs and suggested enhancements in libpng-1.0.6
+Known bugs in libpng-1.2.0
 
-1. April 24, 2000 -- BUG -- binary incompatibility
+1. April 22, 2001: pnggccrd.c has been reported to crash on NetBSD when
+   reading interlaced PNG files, when assembler code is enabled.
 
-   Libpng-1.0.6 is binary incompatible with old applications that
-   allocate the png_struct and png_info structures themselves instead
-   of using png_create_*().  They do not allocate enough space for
-   the structures because they have an incorrect notion of
-   sizeof(png_struct) and sizeof(png_info).  Although such applications
-   should be considered broken rather than considering libpng to be broken,
-   they are numerous and include products of the PNG group, such
-   as gif2png and pnmtopng-2.36 (pnmtopng-2.37 is OK), so libpng will
-   be fixed in version 1.0.7 to work around this problem.
-
-   Applications that use png_create_*() instead of png_ptr=malloc(...)
-   are immune to this problem.
-
-   STATUS:  Fixed in libpng-1.0.6ad, libpng-1.0.6j, and patch-d
-   which are currently being tested by the PNG group.
-   The fix necessarily reintroduces a binary incompatibility with any
-   application that makes direct access to the png_info and
-   png_struct members that deal with the pCAL chunk, palette_lookup,
-   dither_index, time_buffer, or weighted filtering, i.e., any members
-   coming after the new "free_me" member of either structure.  It
-   is believed that applications affected by this reintroduced binary
-   incompatibility are rare (none are known to the PNG group). An
-   effective  workaround for this and the next bug is to recompile the
-   old applications with the installed version of libpng.
-
-2. April 23, 2000 -- BUG -- binary incompatibility
-
-   Libpng-1.0.6 introduced binary incompatibility for applications that
-   make direct access to members of the png_struct and png_info structures,
-   due to the insertion of the free_me member ahead of some previously
-   existing members.
-
-   Applications that use png_set_*(), png_get_*() are immune to this
-   problem, but people are still to this day writing applications that
-   make ill-advised direct access to members of the png_struct and
-   png_info structures, so libpng-1.0.6 will be patched to work around
-   this problem.
-
-   STATUS:  Fixed in libpng-1.0.6j and patch-d, which are currently being
-   tested by the PNG group.  Users can work around the problem without
-   patching libpng by recompiling their applications.
-
-3. April 15, 2000 -- BUG -- pnggccrd.c
-
-   If PNG_NO_GLOBAL_ARRAYS is defined, pnggccrd.c will not compile.
-
-   STATUS: Fixed in libpng-1.0.6g
-
-4. April 1, 2000 -- BUG
-
-   Under some circumstances old applications that make direct access to
-   the info_ptr->text and its members might free the same memory that
-   is also free'ed by libpng during the png_destroy_struct process.
-
-   Fixed in libpng-1.0.6-patch-c and libpng-1.0.6d.  The PNG_FREE_TEXT flag
-   bit in info_ptr->free_me is now checked to make sure libpng is responsible
-   for freeing the memory.
-
-5. April 1, 2000 -- BUG
-
-   The non-ISO-C "strdup()" function is used in png.c
-
-   STATUS: The function has been simplified and no longer uses strdup()
-   in libpng-1.0.6-patch-c and libpng-1.0.6d.
-
-6. March 24, 2000 -- BUG
-
-   The png_set_rgb_to_gray_fixed() function is setting incorrect weighting
-   factors.
-
-   STATUS: Fixed in libpng-1.0.6-patch-b and libpng-1.0.6d.
-
-7. March 22, 2000 -- BUG
-
-   There are some printf() and fprintf() statements active in pngwutil.c
-   when PNG_NO_STDIO and PNG_sCAL_SUPPORTED are both defined.
-
-   STATUS: Fixed in libpng-1.0.6-patch-a and libpng-1.0.6d.  The strcpy()
-   function is used instead.
-
-8. March 22, 2000 -- BUG
-
-   The length of the iCCP chunk data is calculated incorrectly; because
-   it can contain zeroes, strlen() doesn't work.
-
-   STATUS: Fixed in libpng-1.0.6-patch-a and libpng-1.0.6d by adding a
-   data_length parameter to the png_decompress_chunk() function.
-
-9. March 15, 1998 -- OPTIMIZATION -- Kevin Bracey
-
-   Loops need to be optimized everywhere
-
-   Make them count down instead of up -- Kevin Bracey
-
-   Optimizing compilers don't need this, and making
-   the change would be error prone -- Tom Lane, Glenn R-P
-
-   Question whether i-- or --i is better.
-
-   STATUS: Under investigation, postponed until after
-   libpng-1.1.0.  About 160 loops will be turned around
-   in libpng-1.1.Nn, for testing.
-
-10. July 4, 1998 -- ENHANCEMENT -- Glenn R-P
-
-   libpng-1.0.5 and earlier transform colors to gamma=1.0 space for
-   merging with background, and then back to the image's gamma.  The
-   bit_depth of the intermediate (gamma=1.0) representation is probably
-   not sufficient.  In the typical gamma=1/2.2 situation, the linear
-   pixels need about 4 more bits than the gamma-encoded ones, to avoid
-   loss of precision.  A similar situation exists with the rgb_to_gray
-   operation.
-
-   STATUS: under development.
-
-11. September 1999 -- ENHANCEMENT --
-
-   It should be possible to use libpng without floating-point aritmetic.
-
-   STATUS: Under investigation, implementation postponed until after
-   libpng-1.0.6.  The application interface will change because replacements
-   for the png_set_gAMA(), png_set_cHRM(), and corresponding png_get_()
-   functions will be needed.
-
-   Much of this was completed in libpng-1.0.6, but gamma compensation
-   is not yet done in fixed-point arithmetic.
+   STATUS: Under investigation.
 

LICENSE

@@ -1,29 +1,62 @@
-COPYRIGHT NOTICE:
 
-Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
-(libpng versions 0.5, May 1995, through 0.89c, May 1996)
+This copy of the libpng notices is provided for your convenience.  In case of
+any discrepancy between this copy and the notices in the file png.h that is
+included in the libpng distribution, the latter shall prevail.
+
+COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
+
+If you modify libpng you may insert additional notices immediately following
+this sentence.
+
+libpng versions 1.0.7, July 1, 2000, through 1.2.1beta3, October 27, 2001, are
+Copyright (c) 2000 Glenn Randers-Pehrson
+and are distributed according to the same disclaimer and license as libpng-1.0.6
+with the following individuals added to the list of Contributing Authors
+
+   Simon-Pierre Cadieux
+   Eric S. Raymond
+   Gilles Vollant
+
+and with the following additions to the disclaimer:
+
+   There is no warranty against interference with your enjoyment of the
+   library or against infringement.  There is no warranty that our
+   efforts or the library will fulfill any of your particular purposes
+   or needs.  This library is provided with all faults, and the entire
+   risk of satisfactory quality, performance, accuracy, and effort is with
+   the user.
+
+libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
+Copyright (c) 1998, 1999 Glenn Randers-Pehrson, and are
+distributed according to the same disclaimer and license as libpng-0.96,
+with the following individuals added to the list of Contributing Authors:
+
+   Tom Lane
+   Glenn Randers-Pehrson
+   Willem van Schaik
+
+libpng versions 0.89, June 1996, through 0.96, May 1997, are
 Copyright (c) 1996, 1997 Andreas Dilger
-(libpng versions 0.90, December 1996, through 0.96, May 1997)
-Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
-(libpng versions 0.97, January 1998, through 1.0.7beta13, May 16, 2000)
-
-For the purposes of this copyright and license, "Contributing Authors"
-is defined as the following set of individuals:
+Distributed according to the same disclaimer and license as libpng-0.88,
+with the following individuals added to the list of Contributing Authors:
 
    John Bowler
    Kevin Bracey
    Sam Bushell
-   Andreas Dilger
    Magnus Holmgren
-   Tom Lane
-   Dave Martindale
-   Glenn Randers-Pehrson
-   Eric S. Raymond
    Greg Roelofs
+   Tom Tanner
+
+libpng versions 0.5, May 1995, through 0.88, January 1996, are
+Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
+
+For the purposes of this copyright and license, "Contributing Authors"
+is defined as the following set of individuals:
+
+   Andreas Dilger
+   Dave Martindale
    Guy Eric Schalnat
    Paul Schmidt
-   Tom Tanner
-   Willem van Schaik
    Tim Wegner
 
 The PNG Reference Library is supplied "AS IS".  The Contributing Authors
@@ -38,16 +71,13 @@ Permission is hereby granted to use, copy, modify, and distribute this
 source code, or portions hereof, for any purpose, without fee, subject
 to the following restrictions:
 
- 1. The origin of this source code must not be
-    misrepresented.
+1. The origin of this source code must not be misrepresented.
 
- 2. Altered versions must be plainly marked as such
-    and must not be misrepresented as being the
-    original source.
+2. Altered versions must be plainly marked as such and must not
+   be misrepresented as being the original source.
 
- 3. This Copyright notice may not be removed or
-    altered from any source or altered source
-    distribution.
+3. This Copyright notice may not be removed or altered from any
+   source or altered source distribution.
 
 The Contributing Authors and Group 42, Inc. specifically permit, without
 fee, and encourage the use of this source code as a component to
@@ -55,17 +85,18 @@ supporting the PNG file format in commercial products.  If you use this
 source code in a product, acknowledgment is not required but would be
 appreciated.
 
+
 A "png_get_copyright" function is available, for convenient use in "about"
 boxes and the like:
 
    printf("%s",png_get_copyright(NULL));
 
 Also, the PNG logo (in PNG format, of course) is supplied in the
-file "pngnow.png".
+files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
 
 Libpng is OSI Certified Open Source Software.  OSI Certified Open Source is a
 certification mark of the Open Source Initiative.
 
 Glenn Randers-Pehrson
 randeg@alum.rpi.edu
-May 16, 2000
+October 27, 2001

README

@@ -1,4 +1,4 @@
-README for libpng 1.0.7beta13 - May 16, 2000 (shared library 2.1)
+README for libpng 1.2.1beta3 - October 27, 2001 (shared library 2.1)
 See the note about version numbers near the top of png.h
 
 See INSTALL for instructions on how to install libpng.
@@ -148,7 +148,8 @@ Files in this distribution:
       pngerror.c    =>  Error/warning message I/O functions
       pngget.c      =>  Functions for retrieving info from struct
       pngmem.c      =>  Memory handling functions
-      pngnow.png    =>  PNG logo
+      pngbar.png    =>  PNG logo, 88x31
+      pngnow.png    =>  PNG logo, 98x31
       pngpread.c    =>  Progressive reading functions
       pngread.c     =>  Read data/helper high-level functions
       pngrio.c      =>  Lowest-level data read I/O functions
@@ -166,30 +167,49 @@ Files in this distribution:
        gregbook         =>  source code for PNG reading and writing, from
                             Greg Roelofs' "PNG: The Definitive Guide",
                             O'Reilly, 1999
+       msvctest     =>  Builds and runs pngtest using a MSVC workspace
        pngminus     =>  Simple pnm2png and png2pnm programs
        pngsuite     =>  Test images
+       visupng      =>  Contains a MSVC workspace for VisualPng
+      projects      =>  Contains project files and workspaces for building DLL
+       beos             =>  Contains a Beos workspace for building libpng
+       borland          =>  Contains a Borland workspace for building libpng
+                            and zlib
+       msvc             =>  Contains a Microsoft Visual C++ (MSVC) workspace
+                            for building libpng and zlib
+       netware.txt      =>  Contains instructions for downloading a set of
+                            project files for building libpng and zlib on
+                            Netware.
+       wince.txt        =>  Contains instructions for downloading a Microsoft
+                            Visual C++ (Windows CD Toolkit) workspace for
+                            building libpng and zlib on WindowsCE
       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.linux   =>  Linux/ELF makefile
-                            (gcc, creates libpng.so.2.1.0.7beta13)
+                            (gcc, creates libpng.so.2.1.2.1beta3)
        makefile.gcmmx   =>  Linux/ELF makefile (gcc, creates
-                            libpng.so.2.1.0.7beta13, uses assembler code
+                            libpng.so.2.1.2.1beta3, 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
                             ansi2knr (Requires ansi2knr.c from
                             ftp://ftp.cs.wisc.edu/ghost)
+       makefile.aix     =>  AIX makefile
+       makefile.cygwin  =>  Cygwin/gcc makefile
        makefile.dec     =>  DEC Alpha UNIX makefile
+       makefile.hpgcc   =>  HPUX makefile using gcc
        makefile.hpux    =>  HPUX (10.20 and 11.00) makefile
        makefile.ibmc    =>  IBM C/C++ version 3.x for Win32 and OS/2 (static)
        makefile.intel   =>  Intel C/C++ version 4.0 and later
        libpng.icc       =>  Project file, IBM VisualAge/C++ 4.0 or later
+       makefile.macosx  =>  MACOS X Makefile
+       makefile.netbsd  =>  NetBSD/cc makefile, uses PNGGCCRD
        makefile.sgi     =>  Silicon Graphics IRIX (cc, creates static lib)
-       makefile.sggcc   =>  Silicon Graphics (gcc, creates libpng.so.2.1.0.7beta13)
+       makefile.sggcc   =>  Silicon Graphics (gcc, creates libpng.so.2.1.2.1beta3)
        makefile.sunos   =>  Sun makefile
        makefile.solaris =>  Solaris 2.X makefile
-                            (gcc, creates libpng.so.2.1.0.7beta13)
+                            (gcc, creates libpng.so.2.1.2.1beta3)
        makefile.sco     =>  For SCO OSr5  ELF and Unixware 7 with Native cc
        makefile.mips    =>  MIPS makefile
        makefile.acorn   =>  Acorn makefile
@@ -221,7 +241,6 @@ Good luck, and happy coding.
 
 -Glenn Randers-Pehrson
  Internet: randeg@alum.rpi.edu
- Web: http://www.rpi.edu/~randeg/index.html
 
 -Andreas Eric Dilger
  Internet: adilger@enel.ucalgary.ca

TODO

@@ -17,3 +17,8 @@ Better filter selection
    (counting huffman bits/precompression?  filter inertia?  filter costs?).
 Histogram creation.
 Text conversion between different code pages (Latin-1 -> Mac and DOS).
+Should we always malloc 2^bit_depth PLTE/tRNS/hIST entries for safety?
+Build gamma tables using fixed point (and do away with floating point entirely).
+Use greater precision when changing to linear gamma for compositing against
+  background and doing rgb-to-gray transformation.
+Investigate pre-incremented loop counters and other loop constructions.

Y2KINFO

@@ -1,13 +1,13 @@
    Y2K compliance in libpng:
    =========================
 
-      May 16, 2000
+      October 27, 2001
 
       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 1.0.7beta13 are Y2K compliant.  It is my belief that earlier
+      upward through 1.2.1beta3 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

configure

@@ -1,5 +1,5 @@
 echo "
-  There is no \"configure\" script for Libpng-1.0.7beta13.  Instead, please
+  There is no \"configure\" script for Libpng-1.2.1beta3.  Instead, please
   copy the appropriate makefile for your system from the \"scripts\"
   directory.  Read the INSTALL file for more details.
 "

contrib/gregbook/LICENSE

@@ -1,6 +1,6 @@
   ---------------------------------------------------------------------------
 
-      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2001 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

contrib/gregbook/Makefile.sgi

@@ -0,0 +1,102 @@
+# Sample makefile for rpng-x / rpng2-x / wpng for SGI using cc and make.
+# Greg Roelofs
+# Last modified:  16 January 1000
+#
+#	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.)
+#
+# Invoke this makefile from a shell prompt in the usual way; for example:
+#
+#	make -f Makefile.sgi
+#
+# 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.
+#
+# This makefile builds dynamically linked executables (against libpng and zlib,
+# that is), but that can be changed by uncommenting the appropriate PNGLIB and
+# ZLIB lines.
+
+
+# macros --------------------------------------------------------------------
+
+PNGINC = -I/usr/local/include
+PNGLIB = -L/usr/local/lib -lpng	# dynamically linked against libpng
+#PNGLIB = /usr/local/lib/libpng.a	# statically linked against libpng
+# or:
+#PNGINC = -I../..
+#PNGLIB = -L../.. -lpng
+#PNGLIB = ../../libpng.a
+
+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
+
+XINC = -I/usr/include/X11		# old-style, stock X distributions
+XLIB = -L/usr/lib/X11 -lX11
+#XINC = -I/usr/openwin/include    	# Sun workstations (OpenWindows)
+#XLIB = -L/usr/openwin/lib -lX11
+#XINC = -I/usr/X11R6/include		# new X distributions (XFree86, etc.)
+#XLIB = -L/usr/X11R6/lib -lX11
+
+INCS = $(PNGINC) $(ZINC) $(XINC)
+RLIBS = $(PNGLIB) $(ZLIB) $(XLIB) -lm
+WLIBS = $(PNGLIB) $(ZLIB)
+
+CC = cc
+LD = cc
+RM = rm -f
+CFLAGS = -O -fullwarn $(INCS)
+LDFLAGS =
+O = .o
+E =
+
+RPNG  = rpng-x
+RPNG2 = rpng2-x
+WPNG  = wpng
+
+ROBJS  = $(RPNG)$(O) readpng$(O)
+ROBJS2 = $(RPNG2)$(O) readpng2$(O)
+WOBJS  = $(WPNG)$(O) writepng$(O)
+
+EXES = $(RPNG)$(E) $(RPNG2)$(E) $(WPNG)$(E)
+
+
+# implicit make rules -------------------------------------------------------
+
+.c$(O):
+	$(CC) -c $(CFLAGS) $<
+
+
+# dependencies --------------------------------------------------------------
+
+all:  $(EXES)
+
+$(RPNG)$(E): $(ROBJS)
+	$(LD) $(LDFLAGS) -o $@ $(ROBJS) $(RLIBS)
+
+$(RPNG2)$(E): $(ROBJS2)
+	$(LD) $(LDFLAGS) -o $@ $(ROBJS2) $(RLIBS)
+
+$(WPNG)$(E): $(WOBJS)
+	$(LD) $(LDFLAGS) -o $@ $(WOBJS) $(WLIBS)
+
+$(RPNG)$(O):	$(RPNG).c readpng.h
+$(RPNG2)$(O):	$(RPNG2).c readpng2.h
+$(WPNG)$(O):	$(WPNG).c writepng.h
+
+readpng$(O):	readpng.c readpng.h
+readpng2$(O):	readpng2.c readpng2.h
+writepng$(O):	writepng.c writepng.h
+
+
+# maintenance ---------------------------------------------------------------
+
+clean:
+	$(RM) $(EXES) $(ROBJS) $(ROBJS2) $(WOBJS)

contrib/gregbook/Makefile.unx

@@ -1,6 +1,6 @@
 # Sample makefile for rpng-x / rpng2-x / wpng using gcc and make.
 # Greg Roelofs
-# Last modified:  28 February 2000
+# Last modified:  7 February 2001
 #
 #	The programs built by this makefile are described in the book,
 #	"PNG:  The Definitive Guide," by Greg Roelofs (O'Reilly and
@@ -27,20 +27,20 @@ PNGINC = -I/usr/local/include
 #PNGLIB = -L/usr/local/lib -lpng	# dynamically linked against libpng
 PNGLIB = /usr/local/lib/libpng.a	# statically linked against libpng
 # or:
-#PNGINC = -I../..
-#PNGLIB = -L../.. -lpng
-#PNGLIB = ../../libpng.a
+#PNGINC = -I../libpng
+#PNGLIB = -L../libpng -lpng
+#PNGLIB = ../libpng/libpng.a
 
 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
+#ZLIB = ../zlib/libz.a
 
-#XINC = -I/usr/include/X11		# old-style, stock X distributions
+#XINC = -I/usr/include			# old-style, stock X distributions
 #XLIB = -L/usr/lib/X11 -lX11
-#XINC = -I/usr/openwin/include/X11	# Sun workstations (OpenWindows)
+#XINC = -I/usr/openwin/include		# Sun workstations (OpenWindows)
 #XLIB = -L/usr/openwin/lib -lX11
 XINC = -I/usr/X11R6/include		# new X distributions (XFree86, etc.)
 XLIB = -L/usr/X11R6/lib -lX11

contrib/gregbook/Makefile.w32

@@ -32,12 +32,12 @@
 
 # macros --------------------------------------------------------------------
 
-PNGPATH = ../..
+PNGPATH = ../libpng
 PNGINC = -I$(PNGPATH)
 #PNGLIB = $(PNGPATH)/pngdll.lib
 PNGLIB = $(PNGPATH)/libpng.lib
 
-ZPATH = ../../../zlib
+ZPATH = ../zlib
 ZINC = -I$(ZPATH)
 #ZLIB = $(ZPATH)/zlibdll.lib
 ZLIB = $(ZPATH)/zlibstat.lib

contrib/gregbook/README

@@ -16,13 +16,12 @@ of PBMPLUS/NetPBM) and converts them to PNG.
 The source code for all three demo programs currently compiles under
 Unix, OpenVMS, and 32-bit Windows.  (Special thanks to Martin Zinser,
 zinser@decus.de, for making the necessary changes for OpenVMS and for
-providing an appropriate build script.)  Build instructions can be
-found below.
+providing an appropriate build script.)  Build instructions can be found
+below.
 
 Files:
 
    README             this file
-   README.w32         additional Windows-specific information
    LICENSE            terms of distribution and reuse (BSD-like)
 
    Makefile.unx       Unix makefile
@@ -45,26 +44,27 @@ Files:
 
    toucan.png         transparent PNG for testing (by Stefan Schneider)
 
-Note that the programs are designed to be functional, but their primary
-purpose is to demonstrate how to use libpng to add PNG support to other
-programs.  As such, their user interfaces are crude and definitely not
-intended for everyday use.
+Note that, although the programs are designed to be functional, their
+primary purpose is to illustrate how to use libpng to add PNG support to
+other programs.  As such, their user interfaces are crude and definitely
+are not intended for everyday use.
 
-Please see http://www.cdrom.com/pub/png/pngbook.html for further infor-
+Please see http://www.libpng.org/pub/png/pngbook.html for further infor-
 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
-19 March 2000
+newt@pobox.com
+30 June 2001
 
 
 BUILD INSTRUCTIONS
 
- - Prerequisites:
+ - Prerequisites (in order of compilation):
 
-      - zlib		ftp://ftp.cdrom.com/pub/infozip/zlib/zlib.html
-      - libpng		http://www.cdrom.com/pub/png/pngcode.html
-      - pngbook		http://www.cdrom.com/pub/png/book/sources.html
+      - zlib		http://www.gzip.org/zlib/
+      - libpng		http://www.libpng.org/pub/png/libpng.html
+      - pngbook		http://www.libpng.org/pub/png/book/sources.html
 
      The pngbook demo programs are explicitly designed to demonstrate proper
      coding techniques for using the libpng reference library.  As a result,
@@ -128,11 +128,13 @@ BUILD INSTRUCTIONS
 
      The result should be three executables:  rpng-win.exe, rpng2-win.exe,
      and wpng.exe.  Copy them somewhere in your PATH or run them from the
-     current folder.  Unlike the Unix versions, the two windowed programs
-     (rpng and rpng2) do not display a usage screen when invoked without
-     command-line arguments; see README.w32 for brief help or the book for
-     details.  Note that the programs use the Unix-style "-" character to
-     specify options, instead of the more common DOS/Windows "/" character.
+     current folder.  Like the Unix versions, the two windowed programs
+     (rpng and rpng2) now display a usage screen in a console window when
+     invoked without command-line arguments; this is new behavior as of
+     the June 2001 release.  Note that the programs use the Unix-style "-"
+     character to specify options, instead of the more common DOS/Windows
+     "/" character.  (For example:  "rpng2-win -bgpat 4 foo.png", not
+     "rpng2-win /bgpat 4 foo.png")
 
 
  - OpenVMS:

contrib/gregbook/README.w32

@@ -1,53 +0,0 @@
-See the main README file for basic instructions on compiling and running
-the programs.  See http://www.cdrom.com/pub/png/pngbook.html for further
-information and links to the source code, and Chapters 13-15 of the book
-for detailed discussion of the three programs.
-
-Since the two viewers, rpng and rpng2, are both designed to write infor-
-mation to the console (i.e., a DOS-window command line) while displaying
-the image in a graphical window--and since I haven't yet figured out how
-to do that under Windows--here are the usage screens for the two programs:
-
-
-rpng-win 1.02 of 19 March 2000:  Simple PNG Viewer for Windows
-   Compiled with libpng 1.0.5; using libpng 1.0.5.
-   Compiled with zlib 1.1.3; using zlib 1.1.3.
-
-Usage:  rpng-win [-gamma exp] [-bgcolor bg] file.png
-    exp 	transfer-function exponent (``gamma'') of the display
-		  system in floating-point format (e.g., ``2.2''); equal
-		  to the product of the lookup-table exponent (varies)
-		  and the CRT exponent (usually 2.2); must be positive
-    bg  	desired background color in 7-character hex RGB format
-		  (e.g., ``#ff7f00'' for orange:  same as HTML colors);
-		  used with transparent images
-
-Press Q, Esc or mouse button 1 after image is displayed to quit.
-
-
-rpng2-win 1.04 of 19 March 2000:  Progressive PNG Viewer for Windows
-   Compiled with libpng 1.0.5; using libpng 1.0.5.
-   Compiled with zlib 1.1.3; using zlib 1.1.3.
-
-Usage:  rpng2-win [-gamma exp] [-bgcolor bg | -bgpat pat] [-timing] file.png
-
-    exp 	transfer-function exponent (``gamma'') of the display
-		  system in floating-point format (e.g., ``2.2''); equal
-		  to the product of the lookup-table exponent (varies)
-		  and the CRT exponent (usually 2.2); must be positive
-    bg  	desired background color in 7-character hex RGB format
-		  (e.g., ``#ff7f00'' for orange:  same as HTML colors);
-		  used with transparent images; overrides -bgpat
-    pat 	desired background pattern number (1-16); used with
-		  transparent images; overrides -bgcolor
-    -timing	enables delay for every block read, to simulate modem
-		  download of image (~36 Kbps)
-
-Press Q, Esc or mouse button 1 after image is displayed to quit.
-
-
-The usage screen for the third (non-windowed) program, wpng, can be seen
-simply by invoking it without any parameters (``wpng'').
-
-Greg Roelofs
-19 March 2000

contrib/gregbook/makevms.com

@@ -7,12 +7,26 @@ $!
 $!
 $!    Set locations where zlib and libpng sources live.
 $!
-$ zpath = "[-.zlib]"
-$ pngpath = "[-.libpng]"
+$ zpath   = ""
+$ pngpath = ""
 $!
-$! USE THESE INSTEAD if building from libpng's [.contrib.gregbook] directory:
-$! zpath = "[---.zlib]"
-$! pngpath = "[--]"
+$ if f$search("[---.zlib]zlib.h").nes."" then zpath = "[---.zlib]"
+$ if f$search("[--]png.h").nes."" then pngpath = "[--]"
+$!
+$ if f$search("[-.zlib]zlib.h").nes."" then zpath = "[-.zlib]"
+$ if f$search("[-.libpng]png.h").nes."" then pngpath = "[-.libpng]"
+$!
+$ if zpath .eqs. ""
+$ then
+$   write sys$output "zlib include not found. Exiting..."
+$   exit 2
+$ endif 
+$!
+$ if pngpath .eqs. ""
+$ then
+$   write sys$output "libpng include not found. Exiting..."
+$   exit 2
+$ endif 
 $!
 $!    Look for the compiler used.
 $!

contrib/gregbook/readpng.c

@@ -239,7 +239,7 @@ uch *readpng_get_image(double display_exponent, int *pChannels, ulg *pRowbytes)
         return NULL;
     }
 
-    Trace((stderr, "readpng_get_image:  rowbytes = %ld, height = %ld\n", rowbytes, height));
+    Trace((stderr, "readpng_get_image:  channels = %d, rowbytes = %ld, height = %ld\n", *pChannels, rowbytes, height));
 
 
     /* set the individual row_pointers to point at the correct offsets */

contrib/gregbook/readpng2.c

@@ -4,7 +4,7 @@
 
   ---------------------------------------------------------------------------
 
-      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2001 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
@@ -49,8 +49,78 @@ static void readpng2_error_handler(png_structp png_ptr, png_const_charp msg);
 
 void readpng2_version_info(void)
 {
-    fprintf(stderr, "   Compiled with libpng %s; using libpng %s.\n",
-      PNG_LIBPNG_VER_STRING, png_libpng_ver);
+#if defined(PNG_ASSEMBLER_CODE_SUPPORTED) && \
+    (defined(__i386__) || defined(_M_IX86)) && \
+    defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
+    /*
+     * WARNING:  This preprocessor approach means that the following code
+     *           cannot be used with a libpng DLL older than 1.2.0--the
+     *           compiled-in symbols for the new functions will not exist.
+     *           (Could use dlopen() and dlsym() on Unix and corresponding
+     *           calls for Windows, but not portable...)
+     */
+    {
+        int mmxsupport = png_mmx_support();
+        if (mmxsupport < 0)
+            fprintf(stderr, "   Compiled with libpng %s; using libpng %s "
+              "without MMX support.\n", PNG_LIBPNG_VER_STRING, png_libpng_ver);
+        else {
+            int compilerID;
+            png_uint_32 mmx_mask = png_get_mmx_flagmask(
+              PNG_SELECT_READ | PNG_SELECT_WRITE, &compilerID);
+
+            fprintf(stderr, "   Compiled with libpng %s; using libpng %s "
+              "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",
+              mmxsupport? "supports" : "does not support");
+            if (mmxsupport > 0) {
+                int num_optims = 0;
+
+                fprintf(stderr,
+                  "      Potential MMX optimizations supported by libpng:\n");
+                if (mmx_mask & PNG_ASM_FLAG_MMX_READ_FILTER_SUB)
+                    ++num_optims;
+                if (mmx_mask & PNG_ASM_FLAG_MMX_READ_FILTER_UP)
+                    ++num_optims;
+                if (mmx_mask & PNG_ASM_FLAG_MMX_READ_FILTER_AVG)
+                    ++num_optims;
+                if (mmx_mask & PNG_ASM_FLAG_MMX_READ_FILTER_PAETH)
+                    ++num_optims;
+                if (num_optims)
+                    fprintf(stderr,
+                      "         decoding %s row filters (reading)\n",
+                      (num_optims == 4)? "all non-trivial" : "some");
+                if (mmx_mask & PNG_ASM_FLAG_MMX_READ_COMBINE_ROW) {
+                    fprintf(stderr, "         combining rows (reading)\n");
+                    ++num_optims;
+                }
+                if (mmx_mask & PNG_ASM_FLAG_MMX_READ_INTERLACE) {
+                    fprintf(stderr,
+                      "         expanding interlacing (reading)\n");
+                    ++num_optims;
+                }
+                mmx_mask &= ~( 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 (mmx_mask) {
+                    fprintf(stderr, "         other (unknown)\n");
+                    ++num_optims;
+                }
+                if (num_optims == 0)
+                    fprintf(stderr, "         (none)\n");
+            }
+        }
+    }
+#else
+    fprintf(stderr, "   Compiled with libpng %s; using libpng %s "
+      "without MMX support.\n", PNG_LIBPNG_VER_STRING, png_libpng_ver);
+#endif
+
     fprintf(stderr, "   Compiled with zlib %s; using zlib %s.\n",
       ZLIB_VERSION, zlib_version);
 }
@@ -111,6 +181,96 @@ int readpng2_init(mainprog_info *mainprog_ptr)
       readpng2_info_callback, readpng2_row_callback, readpng2_end_callback);
 
 
+    /*
+     * may as well enable or disable MMX routines here, if supported;
+     *
+     * to enable all:  mask = png_get_mmx_flagmask (
+     *                   PNG_SELECT_READ | PNG_SELECT_WRITE, &compilerID);
+     *                 flags = png_get_asm_flags (png_ptr);
+     *                 flags |= mask;
+     *                 png_set_asm_flags (png_ptr, flags);
+     *
+     * to disable all:  mask = png_get_mmx_flagmask (
+     *                   PNG_SELECT_READ | PNG_SELECT_WRITE, &compilerID);
+     *                  flags = png_get_asm_flags (png_ptr);
+     *                  flags &= ~mask;
+     *                  png_set_asm_flags (png_ptr, flags);
+     */
+
+#if (defined(__i386__) || defined(_M_IX86)) && \
+    defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
+    /*
+     * WARNING:  This preprocessor approach means that the following code
+     *           cannot be used with a libpng DLL older than 1.2.0--the
+     *           compiled-in symbols for the new functions will not exist.
+     *           (Could use dlopen() and dlsym() on Unix and corresponding
+     *           calls for Windows, but not portable...)
+     */
+    {
+#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
+        png_uint_32 mmx_disable_mask = 0;
+        png_uint_32 asm_flags, mmx_mask;
+        int compilerID;
+
+        if (mainprog_ptr->nommxfilters)
+            mmx_disable_mask |= ( 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 (mainprog_ptr->nommxcombine)
+            mmx_disable_mask |= PNG_ASM_FLAG_MMX_READ_COMBINE_ROW;
+        if (mainprog_ptr->nommxinterlace)
+            mmx_disable_mask |= PNG_ASM_FLAG_MMX_READ_INTERLACE;
+        asm_flags = png_get_asm_flags(png_ptr);
+        png_set_asm_flags(png_ptr, asm_flags & ~mmx_disable_mask);
+
+
+        /* Now query libpng's asm settings, just for yuks.  Note that this
+         * differs from the querying of its *potential* MMX capabilities
+         * in readpng2_version_info(); this is true runtime verification. */
+
+        asm_flags = png_get_asm_flags(png_ptr);
+        mmx_mask = png_get_mmx_flagmask(PNG_SELECT_READ | PNG_SELECT_WRITE,
+          &compilerID);
+        if (asm_flags & PNG_ASM_FLAG_MMX_SUPPORT_COMPILED)
+            fprintf(stderr,
+              "  MMX support (%s version) is compiled into libpng\n",
+              compilerID == 1? "MSVC++" :
+              (compilerID == 2? "GNU C" : "unknown"));
+        else
+            fprintf(stderr, "  MMX support is not compiled into libpng\n");
+        fprintf(stderr, "  MMX instructions are %ssupported by CPU\n",
+          (asm_flags & PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU)? "" : "not ");
+        fprintf(stderr, "  MMX read support for combining rows is %sabled\n",
+          (asm_flags & PNG_ASM_FLAG_MMX_READ_COMBINE_ROW)? "en" : "dis");
+        fprintf(stderr,
+          "  MMX read support for expanding interlacing is %sabled\n",
+          (asm_flags & PNG_ASM_FLAG_MMX_READ_INTERLACE)? "en" : "dis");
+        fprintf(stderr, "  MMX read support for \"sub\" filter is %sabled\n",
+          (asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_SUB)? "en" : "dis");
+        fprintf(stderr, "  MMX read support for \"up\" filter is %sabled\n",
+          (asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_UP)? "en" : "dis");
+        fprintf(stderr, "  MMX read support for \"avg\" filter is %sabled\n",
+          (asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_AVG)? "en" : "dis");
+        fprintf(stderr, "  MMX read support for \"Paeth\" filter is %sabled\n",
+          (asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_PAETH)? "en" : "dis");
+        asm_flags &= (mmx_mask & ~( 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 (asm_flags)
+            fprintf(stderr,
+              "  additional MMX support is also enabled (0x%02lx)\n",
+              asm_flags);
+#else  /* !PNG_ASSEMBLER_CODE_SUPPORTED */
+        fprintf(stderr, "  MMX querying is disabled in libpng.\n");
+#endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
+    }
+#endif
+
+
     /* make sure we save our pointers for use in readpng2_decode_data() */
 
     mainprog_ptr->png_ptr = png_ptr;

contrib/gregbook/readpng2.h

@@ -4,7 +4,7 @@
 
   ---------------------------------------------------------------------------
 
-      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2001 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
@@ -66,6 +66,11 @@ typedef struct _mainprog_info {
     int rowbytes;
     int channels;
     int need_bgcolor;
+#if (defined(__i386__) || defined(_M_IX86))
+    int nommxfilters;
+    int nommxcombine;
+    int nommxinterlace;
+#endif
     int done;
     uch bg_red;
     uch bg_green;

contrib/gregbook/rpng-win.c

@@ -9,7 +9,6 @@
    with a little tweaking (or maybe not).
 
    to do:
-    - stdout/stderr don't work!  need message window (maybe scrollable?)
     - handle quoted command-line args (especially filenames with spaces)
     - have minimum window width:  oh well
     - use %.1023s to simplify truncation of title-bar string?
@@ -22,10 +21,11 @@
               match; switched to png_jmpbuf() macro
     - 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)
 
   ---------------------------------------------------------------------------
 
-      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2001 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
@@ -52,13 +52,14 @@
 
 #define PROGNAME  "rpng-win"
 #define LONGNAME  "Simple PNG Viewer for Windows"
-#define VERSION   "1.02 of 19 March 2000"
+#define VERSION   "1.20 of 28 May 2001"
 
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
 #include <windows.h>
+#include <conio.h>      /* only for _getch() */
 
 /* #define DEBUG  :  this enables the Trace() macros */
 
@@ -128,7 +129,17 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
     filename = (char *)NULL;
 
 
-    /* First set the default value for our display-system exponent, i.e.,
+    /* First reenable console output, which normally goes to the bit bucket
+     * for windowed apps.  Closing the console window will terminate the
+     * app.  Thanks to David.Geldreich@realviz.com for supplying the magical
+     * incantation. */
+
+    AllocConsole();
+    freopen("CONOUT$", "a", stderr);
+    freopen("CONOUT$", "a", stdout);
+
+
+    /* Next set the default value for our display-system exponent, i.e.,
      * the product of the CRT exponent and the exponent corresponding to
      * the frame-buffer's lookup table (LUT), if any.  This is not an
      * exhaustive list of LUT values (e.g., OpenStep has a lot of weird
@@ -272,20 +283,31 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
     /* usage screen */
 
     if (error) {
-        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
+        int ch;
+
+        fprintf(stderr, "\n%s %s:  %s\n\n", PROGNAME, VERSION, appname);
         readpng_version_info();
         fprintf(stderr, "\n"
-         "Usage:  %s [-gamma exp] [-bgcolor bg] file.png\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 after image is displayed to quit.\n"
-         "\n", PROGNAME, default_display_exponent);
+          "Usage:  %s [-gamma exp] [-bgcolor bg] file.png\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 after image is displayed to quit.\n"
+          "Press Q or Esc to quit this usage screen.\n"
+          "\n", PROGNAME, default_display_exponent);
+        do
+            ch = _getch();
+        while (ch != 'q' && ch != 'Q' && ch != 0x1B);
         exit(1);
+    } else {
+        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
+        fprintf(stderr,
+          "\n   [console window:  closing this window will terminate %s]\n\n",
+          PROGNAME);
     }
 
 

contrib/gregbook/rpng-x.c

@@ -21,10 +21,12 @@
     - 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
 
   ---------------------------------------------------------------------------
 
-      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2001 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
@@ -51,7 +53,7 @@
 
 #define PROGNAME  "rpng-x"
 #define LONGNAME  "Simple PNG Viewer for X"
-#define VERSION   "1.11 of 19 March 2000"
+#define VERSION   "1.13 of 16 August 2001"
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -117,6 +119,7 @@ static Colormap colormap;
 static int have_nondefault_visual = FALSE;
 static int have_colormap = FALSE;
 static int have_window = FALSE;
+static int have_gc = FALSE;
 /*
 ulg numcolors=0, pixels[256];
 ush reds[256], greens[256], blues[256];
@@ -542,9 +545,20 @@ static int rpng_x_create_window(void)
     XSetWMProperties(display, window, pWindowName, pIconName, NULL, 0,
       size_hints, wm_hints, NULL);
 
+    /* various properties and hints no longer needed; free memory */
+    if (pWindowName)
+       XFree(pWindowName->value);
+    if (pIconName)
+       XFree(pIconName->value);
+    if (size_hints)
+        XFree(size_hints);
+    if (wm_hints)
+       XFree(wm_hints);
+
     XMapWindow(display, window);
 
     gc = XCreateGC(display, window, 0, &gcvalues);
+    have_gc = TRUE;
 
 /*---------------------------------------------------------------------------
     Fill window with the specified background color.
@@ -814,7 +828,8 @@ static void rpng_x_cleanup(void)
         ximage = NULL;
     }
 
-    XFreeGC(display, gc);
+    if (have_gc)
+        XFreeGC(display, gc);
 
     if (have_window)
         XDestroyWindow(display, window);

contrib/gregbook/rpng2-win.c

@@ -11,7 +11,6 @@
    Meulen for the "diamond" and "radial waves" patterns, respectively.
 
    to do:
-    - stdout/stderr don't work!  need message window (maybe scrollable?)
     - 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?
@@ -25,10 +24,13 @@
     - 1.03:  modified to allow abbreviated options
     - 1.04:  removed bogus extra argument from usage fprintf() [Glenn R-P?];
               fixed command-line parsing bug
+    - 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
 
   ---------------------------------------------------------------------------
 
-      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2001 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
@@ -55,7 +57,7 @@
 
 #define PROGNAME  "rpng2-win"
 #define LONGNAME  "Progressive PNG Viewer for Windows"
-#define VERSION   "1.04 of 19 March 2000"
+#define VERSION   "1.21 of 29 June 2001"
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -64,6 +66,7 @@
 #include <time.h>
 #include <math.h>      /* only for PvdM background code */
 #include <windows.h>
+#include <conio.h>     /* only for _getch() */
 
 /* all for PvdM background code: */
 #ifndef PI
@@ -239,6 +242,16 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
     memset(&rpng2_info, 0, sizeof(mainprog_info));
 
 
+    /* Next reenable console output, which normally goes to the bit bucket
+     * for windowed apps.  Closing the console window will terminate the
+     * app.  Thanks to David.Geldreich@realviz.com for supplying the magical
+     * incantation. */
+
+    AllocConsole();
+    freopen("CONOUT$", "a", stderr);
+    freopen("CONOUT$", "a", stdout);
+
+
     /* Set the default value for our display-system exponent, i.e., the
      * product of the CRT exponent and the exponent corresponding to
      * the frame-buffer's lookup table (LUT), if any.  This is not an
@@ -354,6 +367,18 @@ 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))
+        } else if (!strncmp(*argv, "-nommxfilters", 7)) {
+            rpng2_info.nommxfilters = TRUE;
+        } else if (!strncmp(*argv, "-nommxcombine", 7)) {
+            rpng2_info.nommxcombine = TRUE;
+        } else if (!strncmp(*argv, "-nommxinterlace", 7)) {
+            rpng2_info.nommxinterlace = TRUE;
+        } else if (!strcmp(*argv, "-nommx")) {
+            rpng2_info.nommxfilters = TRUE;
+            rpng2_info.nommxcombine = TRUE;
+            rpng2_info.nommxinterlace = TRUE;
+#endif
         } else {
             if (**argv != '-') {
                 filename = *argv;
@@ -401,25 +426,49 @@ int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
     /* usage screen */
 
     if (error) {
-        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
+        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]"
-          " file.png\n\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\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\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"
-          "\n", PROGNAME, default_display_exponent, num_bgpat);
+          "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);
+        do
+            ch = _getch();
+        while (ch != 'q' && ch != 'Q' && ch != 0x1B);
         exit(1);
+    } else {
+        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
+        fprintf(stderr,
+          "\n   [console window:  closing this window will terminate %s]\n\n",
+          PROGNAME);
+        fflush(stderr);
     }
 
 

contrib/gregbook/rpng2-x.c

@@ -25,10 +25,13 @@
     - 1.10:  added support for non-default visuals; fixed X pixel-conversion
     - 1.11:  added -usleep option for demos; fixed command-line parsing bug
     - 1.12:  added -pause option for demos and testing
+    - 1.20:  added runtime MMX-enabling/disabling and new -mmx* options
+    - 1.21:  fixed small X memory leak (thanks to Francois Petitjean)
+    - 1.22:  fixed XFreeGC() crash bug
 
   ---------------------------------------------------------------------------
 
-      Copyright (c) 1998-2000 Greg Roelofs.  All rights reserved.
+      Copyright (c) 1998-2001 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
@@ -55,7 +58,7 @@
 
 #define PROGNAME  "rpng2-x"
 #define LONGNAME  "Progressive PNG Viewer for X"
-#define VERSION   "1.12 of 19 March 2000"
+#define VERSION   "1.22 of 16 August 2001"
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -226,6 +229,7 @@ static Colormap colormap;
 static int have_nondefault_visual = FALSE;
 static int have_colormap = FALSE;
 static int have_window = FALSE;
+static int have_gc = FALSE;
 
 
 
@@ -359,6 +363,18 @@ int main(int argc, char **argv)
             pause_after_pass = TRUE;
         } else if (!strncmp(*argv, "-timing", 2)) {
             timing = TRUE;
+#if (defined(__i386__) || defined(_M_IX86))
+        } else if (!strncmp(*argv, "-nommxfilters", 7)) {
+            rpng2_info.nommxfilters = TRUE;
+        } else if (!strncmp(*argv, "-nommxcombine", 7)) {
+            rpng2_info.nommxcombine = TRUE;
+        } else if (!strncmp(*argv, "-nommxinterlace", 7)) {
+            rpng2_info.nommxinterlace = TRUE;
+        } else if (!strcmp(*argv, "-nommx")) {
+            rpng2_info.nommxfilters = TRUE;
+            rpng2_info.nommxcombine = TRUE;
+            rpng2_info.nommxinterlace = TRUE;
+#endif
         } else {
             if (**argv != '-') {
                 filename = *argv;
@@ -414,10 +430,13 @@ int main(int argc, char **argv)
     /* usage screen */
 
     if (error) {
-        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
+        fprintf(stderr, "\n%s %s:  %s\n\n", PROGNAME, VERSION, appname);
         readpng2_version_info();
         fprintf(stderr, "\n"
           "Usage:  %s [-display xdpy] [-gamma exp] [-bgcolor bg | -bgpat pat]\n"
+#if (defined(__i386__) || defined(_M_IX86))
+          "        %*s [[-nommxfilters] [-nommxcombine] [-nommxinterlace] | -nommx]\n"
+#endif
           "        %*s [-usleep dur | -timing] [-pause] file.png\n\n"
           "    xdpy\tname of the target X display (e.g., ``hostname:0'')\n"
           "    exp \ttransfer-function exponent (``gamma'') of the display\n"
@@ -429,6 +448,10 @@ int main(int argc, char **argv)
           "\t\t  used with transparent images; overrides -bgpat\n"
           "    pat \tdesired background pattern number (1-%d); used with\n"
           "\t\t  transparent images; overrides -bgcolor\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
           "    dur \tduration in microseconds to wait after displaying each\n"
           "\t\t  row (for demo purposes)\n"
           "    -timing\tenables delay for every block read, to simulate modem\n"
@@ -436,8 +459,11 @@ int main(int argc, char **argv)
           "    -pause\tpauses after displaying each pass until key pressed\n"
           "\nPress Q, Esc or mouse button 1 (within image window, after image\n"
           "is displayed) to quit.\n"
-          "\n", PROGNAME, strlen(PROGNAME), " ", default_display_exponent,
-          num_bgpat);
+          "\n", PROGNAME,
+#if (defined(__i386__) || defined(_M_IX86))
+          strlen(PROGNAME), " ",
+#endif
+          strlen(PROGNAME), " ", default_display_exponent, num_bgpat);
         exit(1);
     }
 
@@ -562,8 +588,15 @@ static void rpng2_x_init(void)
      * pattern */
 
     if (rpng2_x_create_window()) {
+
+        /* GRR TEMPORARY HACK:  this is fundamentally no different from cases
+         * above; libpng should longjmp() back to us when png_ptr goes away.
+         * If we/it segfault instead, seems like a libpng bug... */
+
+        /* we're here via libpng callback, so if window fails, clean and bail */
         readpng2_cleanup(&rpng2_info);
-        return;
+        rpng2_x_cleanup();
+        exit(2);
     }
 }
 
@@ -715,9 +748,20 @@ static int rpng2_x_create_window(void)
     XSetWMProperties(display, window, pWindowName, pIconName, NULL, 0,
       size_hints, wm_hints, NULL);
 
+    /* various properties and hints no longer needed; free memory */
+    if (pWindowName)
+       XFree(pWindowName->value);
+    if (pIconName)
+       XFree(pIconName->value);
+    if (size_hints)
+        XFree(size_hints);
+    if (wm_hints)
+       XFree(wm_hints);
+
     XMapWindow(display, window);
 
     gc = XCreateGC(display, window, 0, &gcvalues);
+    have_gc = TRUE;
 
 /*---------------------------------------------------------------------------
     Allocate memory for the X- and display-specific version of the image.
@@ -1333,7 +1377,8 @@ static void rpng2_x_cleanup(void)
         ximage = NULL;
     }
 
-    XFreeGC(display, gc);
+    if (have_gc)
+        XFreeGC(display, gc);
 
     if (have_window)
         XDestroyWindow(display, window);

contrib/msvctest/README.txt

@@ -0,0 +1,22 @@
+Microsoft Developer Studio Build File, Format Version 6.00 for
+msvctest
+
+Assumes that libpng DLLs and LIBs are in ..\..\projects\msvc\win32\libpng
+Assumes that zlib DLLs and LIBs are in ..\..\projects\msvc\win32\zlib
+
+To build:
+
+1) On the main menu Select "Build|Set Active configuration".
+   Choose the configuration that corresponds to the library you want to test.
+   This library must have been built using the libpng MS project located in
+   the "mscv" subdirectory.
+
+2) Select "Build|Clean"
+
+3) Select "Build|Rebuild All"
+
+4) The test results should appear in the "Build" pane of the Output Window.
+
+
+Simon-Pierre Cadieux
+Methodex Computer Systems Inc.

contrib/msvctest/msvctest.dsp

@@ -0,0 +1,247 @@
+# Microsoft Developer Studio Project File - Name="msvctest" - Package Owner=<4>
+# Microsoft Developer Studio Generated Build File, Format Version 6.00
+# ** DO NOT EDIT **
+
+# TARGTYPE "Win32 (x86) Console Application" 0x0103
+
+CFG=msvctest - Win32 Debug DLL
+!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 "msvctest.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 "msvctest.mak" CFG="msvctest - Win32 Debug DLL"
+!MESSAGE 
+!MESSAGE Possible choices for configuration are:
+!MESSAGE 
+!MESSAGE "msvctest - Win32 DLL" (based on "Win32 (x86) Console Application")
+!MESSAGE "msvctest - Win32 Debug DLL" (based on "Win32 (x86) Console Application")
+!MESSAGE "msvctest - Win32 ASM DLL" (based on "Win32 (x86) Console Application")
+!MESSAGE "msvctest - Win32 Debug ASM DLL" (based on "Win32 (x86) Console Application")
+!MESSAGE "msvctest - Win32 LIB" (based on "Win32 (x86) Console Application")
+!MESSAGE "msvctest - Win32 Debug LIB" (based on "Win32 (x86) Console Application")
+!MESSAGE 
+
+# Begin Project
+# PROP AllowPerConfigDependencies 0
+# PROP Scc_ProjName ""
+# PROP Scc_LocalPath ""
+CPP=cl.exe
+RSC=rc.exe
+
+!IF  "$(CFG)" == "msvctest - Win32 DLL"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "dll"
+# PROP BASE Intermediate_Dir "dll"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir "dll"
+# PROP Intermediate_Dir "dll"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /O1 /D "NDEBUG" /D "WIN32" /D "_CONSOLE" /FD /c
+# ADD CPP /nologo /MD /W3 /O1 /I "..\..\..\zlib" /D "NDEBUG" /D "WIN32" /D "_CONSOLE" /D "PNG_DLL" /D "PNG_NO_STDIO" /D "PNG_NO_GLOBAL_ARRAYS" /FD /c
+# ADD BASE RSC /l 0x409 /d "NDEBUG"
+# ADD RSC /l 0x409 /d "NDEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 /nologo /subsystem:console /machine:I386
+# ADD LINK32 ..\..\projects\msvc\win32\libpng\dll\libpng3.lib /nologo /subsystem:console /machine:I386
+# Begin Special Build Tool
+OutDir=.\dll
+SOURCE="$(InputPath)"
+PostBuild_Desc=[Run Test]
+PostBuild_Cmds=set path=..\..\projects\msvc\win32\libpng\dll;..\..\projects\msvc\win32\zlib\dll;	$(outdir)\msvctest.exe ..\..\pngtest.png
+# End Special Build Tool
+
+!ELSEIF  "$(CFG)" == "msvctest - Win32 Debug DLL"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 1
+# PROP BASE Output_Dir "dll_dbg"
+# PROP BASE Intermediate_Dir "dll_dbg"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 1
+# PROP Output_Dir "dll_dbg"
+# PROP Intermediate_Dir "dll_dbg"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /Zi /Od /D "_DEBUG" /D "WIN32" /D "_CONSOLE" /D "_MBCS" /YX /FD /GZ /c
+# ADD CPP /nologo /MDd /W3 /Zi /Od /I "..\..\..\zlib" /D "_DEBUG" /D "WIN32" /D "_CONSOLE" /D "_MBCS" /D "PNG_DLL" /D "PNG_NO_STDIO" /D "PNG_NO_GLOBAL_ARRAYS" /FD /GZ /c
+# ADD BASE RSC /l 0x409 /d "_DEBUG"
+# ADD RSC /l 0x409 /d "_DEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
+# ADD LINK32 ..\..\projects\msvc\win32\libpng\dll_dbg\libpng3d.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
+# Begin Special Build Tool
+OutDir=.\dll_dbg
+SOURCE="$(InputPath)"
+PostBuild_Desc=[Run Test]
+PostBuild_Cmds=set path=..\..\projects\msvc\win32\libpng\dll_dbg;..\..\projects\msvc\win32\zlib\dll_dbg;	$(outdir)\msvctest.exe ..\..\pngtest.png
+# End Special Build Tool
+
+!ELSEIF  "$(CFG)" == "msvctest - Win32 ASM DLL"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "dll_asm"
+# PROP BASE Intermediate_Dir "dll_asm"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir "dll_asm"
+# PROP Intermediate_Dir "dll_asm"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /O1 /D "NDEBUG" /D "WIN32" /D "_CONSOLE" /FD /c
+# ADD CPP /nologo /MD /W3 /O1 /I "..\..\..\zlib" /D "NDEBUG" /D "WIN32" /D "_CONSOLE" /D "PNG_DLL" /D "PNG_NO_STDIO" /D "PNG_NO_GLOBAL_ARRAYS" /FD /c
+# ADD BASE RSC /l 0x409 /d "NDEBUG"
+# ADD RSC /l 0x409 /d "NDEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 /nologo /subsystem:console /machine:I386
+# ADD LINK32 ..\..\projects\msvc\win32\libpng\dll_asm\libpng3a.lib /nologo /subsystem:console /machine:I386
+# Begin Special Build Tool
+OutDir=.\dll_asm
+SOURCE="$(InputPath)"
+PostBuild_Desc=[Run Test]
+PostBuild_Cmds=set path=..\..\projects\msvc\win32\libpng\dll_asm;..\..\projects\msvc\win32\zlib\dll_asm;	$(outdir)\msvctest.exe ..\..\pngtest.png
+# End Special Build Tool
+
+!ELSEIF  "$(CFG)" == "msvctest - Win32 Debug ASM DLL"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 1
+# PROP BASE Output_Dir "dll_dbga"
+# PROP BASE Intermediate_Dir "dll_dbga"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 1
+# PROP Output_Dir "dll_dbga"
+# PROP Intermediate_Dir "dll_dbga"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /Zi /Od /D "_DEBUG" /D "WIN32" /D "_CONSOLE" /D "_MBCS" /YX /FD /GZ /c
+# ADD CPP /nologo /MDd /W3 /Zi /Od /I "..\..\..\zlib" /D "_DEBUG" /D "WIN32" /D "_CONSOLE" /D "_MBCS" /D "PNG_DLL" /D "PNG_NO_STDIO" /D "PNG_NO_GLOBAL_ARRAYS" /FD /GZ /c
+# ADD BASE RSC /l 0x409 /d "_DEBUG"
+# ADD RSC /l 0x409 /d "_DEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
+# ADD LINK32 ..\..\projects\msvc\win32\libpng\dll_dbga\libpng3b.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
+# Begin Special Build Tool
+OutDir=.\dll_dbga
+SOURCE="$(InputPath)"
+PostBuild_Desc=[Run Test]
+PostBuild_Cmds=set path=..\..\projects\msvc\win32\libpng\dll_dbga;..\..\projects\msvc\win32\zlib\dll_dbga;	$(outdir)\msvctest.exe ..\..\pngtest.png
+# End Special Build Tool
+
+!ELSEIF  "$(CFG)" == "msvctest - Win32 LIB"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "lib"
+# PROP BASE Intermediate_Dir "lib"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir "lib"
+# PROP Intermediate_Dir "lib"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /O1 /D "NDEBUG" /D "WIN32" /D "_CONSOLE" /FD /c
+# ADD CPP /nologo /W3 /O1 /I "..\..\..\zlib" /D "NDEBUG" /D "WIN32" /D "_CONSOLE" /FD /c
+# ADD BASE RSC /l 0x409 /d "NDEBUG"
+# ADD RSC /l 0x409 /d "NDEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 /nologo /subsystem:console /machine:I386
+# ADD LINK32 ..\..\projects\msvc\win32\libpng\lib\libpng.lib /nologo /subsystem:console /machine:I386
+# Begin Special Build Tool
+OutDir=.\lib
+SOURCE="$(InputPath)"
+PostBuild_Desc=[Run Test]
+PostBuild_Cmds=$(outdir)\msvctest.exe ..\..\pngtest.png
+# End Special Build Tool
+
+!ELSEIF  "$(CFG)" == "msvctest - Win32 Debug LIB"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 1
+# PROP BASE Output_Dir "lib_dbg"
+# PROP BASE Intermediate_Dir "lib_dbg"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 1
+# PROP Output_Dir "lib_dbg"
+# PROP Intermediate_Dir "lib_dbg"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /Zi /Od /D "_DEBUG" /D "WIN32" /D "_CONSOLE" /D "_MBCS" /YX /FD /GZ /c
+# ADD CPP /nologo /W3 /Zi /Od /I "..\..\..\zlib" /D "_DEBUG" /D "WIN32" /D "_CONSOLE" /D "_MBCS" /FD /GZ /c
+# ADD BASE RSC /l 0x409 /d "_DEBUG"
+# ADD RSC /l 0x409 /d "_DEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
+# ADD LINK32 ..\..\projects\msvc\win32\libpng\lib_dbg\libpng.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
+# Begin Special Build Tool
+OutDir=.\lib_dbg
+SOURCE="$(InputPath)"
+PostBuild_Desc=[Run Test]
+PostBuild_Cmds=$(outdir)\msvctest.exe ..\..\pngtest.png
+# End Special Build Tool
+
+!ENDIF 
+
+# Begin Target
+
+# Name "msvctest - Win32 DLL"
+# Name "msvctest - Win32 Debug DLL"
+# Name "msvctest - Win32 ASM DLL"
+# Name "msvctest - Win32 Debug ASM DLL"
+# Name "msvctest - Win32 LIB"
+# Name "msvctest - Win32 Debug LIB"
+# Begin Group "Source Files"
+
+# PROP Default_Filter "cpp;c;cxx;rc;def;r;odl;idl;hpj;bat"
+# Begin Source File
+
+SOURCE=..\..\pngtest.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\README.txt
+# PROP Exclude_From_Build 1
+# End Source File
+# End Group
+# Begin Group "Header Files"
+
+# PROP Default_Filter "h;hpp;hxx;hm;inl"
+# End Group
+# Begin Group "Resource Files"
+
+# PROP Default_Filter "ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe"
+# End Group
+# End Target
+# End Project

contrib/msvctest/msvctest.dsw

@@ -0,0 +1,29 @@
+Microsoft Developer Studio Workspace File, Format Version 6.00
+# WARNING: DO NOT EDIT OR DELETE THIS WORKSPACE FILE!
+
+###############################################################################
+
+Project: "msvctest"=.\msvctest.dsp - Package Owner=<4>
+
+Package=<5>
+{{{
+}}}
+
+Package=<4>
+{{{
+}}}
+
+###############################################################################
+
+Global:
+
+Package=<5>
+{{{
+}}}
+
+Package=<3>
+{{{
+}}}
+
+###############################################################################
+

contrib/pngminus/makefile.std

@@ -1,26 +1,31 @@
 # Makefile for PngMinus (png2pnm and pnm2png)
 # Linux / Unix
 
-CC=cc -O
-LD=cc -O
-#CC=gcc -O
-#LD=gcc -O
-LB=ar
-RM=rm
-CP=cp
+#CC=cc
+CC=gcc
+LD=$(CC)
 
-PNGPATH = /usr/local
-PNGINC = $(PNGPATH)/include
-#PNGLIB = $(PNGPATH)/lib -lpng
-PNGLIB = $(PNGPATH)/lib/libpng.a
+RM=rm -f
 
-ZPATH = /usr/local
-ZINC = $(ZPATH)/include
-#ZLIB = $(ZPATH)/lib -lz
-ZLIB = $(ZPATH)/lib/libz.a
+#PNGPATH = /usr/local
+#PNGINC = -I$(PNGPATH)/include
+#PNGLIB = -L$(PNGPATH)/lib -lpng
+#PNGLIBS = $(PNGPATH)/lib/libpng.a
+PNGINC = -I../..
+PNGLIB = -L../.. -lpng
+PNGLIBS = ../../libpng.a
 
-CCFLAGS=-I$(PNGINC) -I$(ZINC)
-LDFLAGS=-L$(PNGLIB) -L$(ZLIB)
+#ZPATH = /usr/local
+#ZINC = -I$(ZPATH)/include
+#ZLIB = -L$(ZPATH)/lib -lz
+#ZLIBS = $(ZPATH)/lib/libz.a
+ZINC = -I../../../zlib
+ZLIB = -L../../../zlib -lz
+ZLIBS = ../../../zlib/libz.a
+
+CFLAGS=-O3 $(PNGINC) $(ZINC)
+LDFLAGS=$(PNGLIB) $(ZLIB)
+LDFLAGSS=$(PNGLIBS) $(ZLIBS)
 C=.c
 O=.o
 L=.a
@@ -28,25 +33,33 @@ E=
 
 # dependencies
 
-all: png2pnm$(E) pnm2png$(E)
+#all: png2pnm$(E) pnm2png$(E)
+all: png2pnm$(E) pnm2png$(E) png2pnm-static$(E) pnm2png-static$(E)
 
 png2pnm$(O): png2pnm$(C)
-	$(CC) -c $(CCFLAGS) png2pnm$(C)
+	$(CC) -c $(CFLAGS) png2pnm$(C)
 
 png2pnm$(E): png2pnm$(O)
-	$(LD) -o png2pnm$(E) png2pnm$(O) $(LDFLAGS) -lpng -lz -lm
+	$(LD) -o png2pnm$(E) png2pnm$(O) $(LDFLAGS) -lm
+
+png2pnm-static$(E): png2pnm$(O)
+	$(LD) -o png2pnm-static$(E) png2pnm$(O) $(LDFLAGSS) -lm
 
 pnm2png$(O): pnm2png$(C)
-	$(CC) -c $(CCFLAGS) pnm2png$(C)
+	$(CC) -c $(CFLAGS) pnm2png$(C)
 
 pnm2png$(E): pnm2png$(O)
-	$(LD) -o pnm2png$(E) pnm2png$(O) $(LDFLAGS) -lpng -lz -lm
+	$(LD) -o pnm2png$(E) pnm2png$(O) $(LDFLAGS) -lm
+
+pnm2png-static$(E): pnm2png$(O)
+	$(LD) -o pnm2png-static$(E) pnm2png$(O) $(LDFLAGSS) -lm
 
 clean:
 	$(RM) png2pnm$(O)
 	$(RM) pnm2png$(O)
 	$(RM) png2pnm$(E)
 	$(RM) pnm2png$(E)
+	$(RM) png2pnm-static$(E)
+	$(RM) pnm2png-static$(E)
 
 # End of makefile for png2pnm / pnm2png
-

contrib/pngminus/makevms.com

@@ -45,9 +45,9 @@ $   call make pnm2png.exe -
 $   write sys$output "Building png2pnm..."
 $   CALL MAKE png2pnm.OBJ "cc ''CCOPT' png2pnm" -
 	png2pnm.c
-$   call make pnm2png.exe -
-	"LINK pnm2png,lib.opt/opt" -
-	pnm2png.obj
+$   call make png2pnm.exe -
+	"LINK png2pnm,lib.opt/opt" -
+	png2pnm.obj
 $ exit
 $!
 $!

contrib/pngminus/png2pnm.c

@@ -204,6 +204,7 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL a
   int           row, col;
   int           ret;
   int           i;
+  long          dep_16;
 
   /* read and check signature in PNG file */
   ret = fread (buf, 1, 8, png_file);
@@ -379,8 +380,10 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL a
         if (raw)
           fputc ((int) *pix_ptr++ , pnm_file);
         else
-          if (bit_depth == 16)
-            fprintf (pnm_file, "%ld ", ((long) *pix_ptr++ << 8) + (long) *pix_ptr++);
+          if (bit_depth == 16){
+	    dep_16 = (long) *pix_ptr++;
+            fprintf (pnm_file, "%ld ", (dep_16 << 8) + ((long) *pix_ptr++));
+          }
           else
             fprintf (pnm_file, "%ld ", (long) *pix_ptr++);
       }
@@ -397,8 +400,10 @@ BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, BOOL a
           if (raw)
             fputc ((int) *pix_ptr++ , alpha_file);
           else
-            if (bit_depth == 16)
-              fprintf (alpha_file, "%ld ", ((long) *pix_ptr++ << 8) + (long) *pix_ptr++);
+            if (bit_depth == 16){
+	      dep_16 = (long) *pix_ptr++;
+              fprintf (alpha_file, "%ld ", (dep_16 << 8) + (long) *pix_ptr++);
+	    }  
             else
               fprintf (alpha_file, "%ld ", (long) *pix_ptr++);
         }

contrib/visupng/PngFile.c

@@ -0,0 +1,439 @@
+//-------------------------------------
+//  PNGFILE.C -- Image File Functions
+//-------------------------------------
+
+// Copyright 2000, Willem van Schaik.  For conditions of distribution and
+// use, see the copyright/license/disclaimer notice in png.h
+
+#include <windows.h>
+#include <commdlg.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "png.h"
+#include "pngfile.h"
+#include "cexcept.h"
+
+define_exception_type(const char *);
+extern struct exception_context the_exception_context[1];
+struct exception_context the_exception_context[1];
+png_const_charp msg;
+
+static OPENFILENAME ofn;
+
+static png_structp png_ptr = NULL;
+static png_infop info_ptr = NULL;
+
+
+// cexcept interface
+
+static void
+png_cexcept_error(png_structp png_ptr, png_const_charp msg)
+{
+   if(png_ptr)
+     ;
+#ifndef PNG_NO_CONSOLE_IO
+   fprintf(stderr, "libpng error: %s\n", msg);
+#endif
+   {
+      Throw msg;
+   }
+}
+
+// Windows open-file functions
+
+void PngFileInitialize (HWND hwnd)
+{
+    static TCHAR szFilter[] = TEXT ("PNG Files (*.PNG)\0*.png\0")
+        TEXT ("All Files (*.*)\0*.*\0\0");
+
+    ofn.lStructSize       = sizeof (OPENFILENAME);
+    ofn.hwndOwner         = hwnd;
+    ofn.hInstance         = NULL;
+    ofn.lpstrFilter       = szFilter;
+    ofn.lpstrCustomFilter = NULL;
+    ofn.nMaxCustFilter    = 0;
+    ofn.nFilterIndex      = 0;
+    ofn.lpstrFile         = NULL;          // Set in Open and Close functions
+    ofn.nMaxFile          = MAX_PATH;
+    ofn.lpstrFileTitle    = NULL;          // Set in Open and Close functions
+    ofn.nMaxFileTitle     = MAX_PATH;
+    ofn.lpstrInitialDir   = NULL;
+    ofn.lpstrTitle        = NULL;
+    ofn.Flags             = 0;             // Set in Open and Close functions
+    ofn.nFileOffset       = 0;
+    ofn.nFileExtension    = 0;
+    ofn.lpstrDefExt       = TEXT ("png");
+    ofn.lCustData         = 0;
+    ofn.lpfnHook          = NULL;
+    ofn.lpTemplateName    = NULL;
+}
+
+BOOL PngFileOpenDlg (HWND hwnd, PTSTR pstrFileName, PTSTR pstrTitleName)
+{
+    ofn.hwndOwner         = hwnd;
+    ofn.lpstrFile         = pstrFileName;
+    ofn.lpstrFileTitle    = pstrTitleName;
+    ofn.Flags             = OFN_HIDEREADONLY;
+
+    return GetOpenFileName (&ofn);
+}
+
+BOOL PngFileSaveDlg (HWND hwnd, PTSTR pstrFileName, PTSTR pstrTitleName)
+{
+    ofn.hwndOwner         = hwnd;
+    ofn.lpstrFile         = pstrFileName;
+    ofn.lpstrFileTitle    = pstrTitleName;
+    ofn.Flags             = OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT;
+
+    return GetSaveFileName (&ofn);
+}
+
+// PNG image handler functions
+
+BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData,
+                   int *piWidth, int *piHeight, int *piChannels, png_color *pBkgColor)
+{
+    static FILE        *pfFile;
+    png_byte            pbSig[8];
+    int                 iBitDepth;
+    int                 iColorType;
+    double              dGamma;
+    png_color_16       *pBackground;
+    png_uint_32         ulChannels;
+    png_uint_32         ulRowBytes;
+    png_byte           *pbImageData = *ppbImageData;
+    static png_byte   **ppbRowPointers = NULL;
+    int                 i;
+
+    // open the PNG input file
+
+    if (!pstrFileName)
+    {
+        *ppbImageData = pbImageData = NULL;
+        return FALSE;
+    }
+
+    if (!(pfFile = fopen(pstrFileName, "rb")))
+    {
+        *ppbImageData = pbImageData = NULL;
+        return FALSE;
+    }
+
+    // first check the eight byte PNG signature
+
+    fread(pbSig, 1, 8, pfFile);
+    if (!png_check_sig(pbSig, 8))
+    {
+        *ppbImageData = pbImageData = NULL;
+        return FALSE;
+    }
+
+    // create the two png(-info) structures
+
+    png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL,
+      (png_error_ptr)png_cexcept_error, (png_error_ptr)NULL);
+    if (!png_ptr)
+    {
+        *ppbImageData = pbImageData = NULL;
+        return FALSE;
+    }
+
+    info_ptr = png_create_info_struct(png_ptr);
+    if (!info_ptr)
+    {
+        png_destroy_read_struct(&png_ptr, NULL, NULL);
+        *ppbImageData = pbImageData = NULL;
+        return FALSE;
+    }
+
+    Try
+    {
+        
+        // initialize the png structure
+        
+#if !defined(PNG_NO_STDIO)
+        png_init_io(png_ptr, pfFile);
+#else
+        png_set_read_fn(png_ptr, (png_voidp)pfFile, png_read_data);
+#endif
+        
+        png_set_sig_bytes(png_ptr, 8);
+        
+        // read all PNG info up to image data
+        
+        png_read_info(png_ptr, info_ptr);
+        
+        // get width, height, bit-depth and color-type
+        
+        png_get_IHDR(png_ptr, info_ptr, piWidth, piHeight, &iBitDepth,
+            &iColorType, NULL, NULL, NULL);
+        
+        // expand images of all color-type and bit-depth to 3x8 bit RGB images
+        // let the library process things like alpha, transparency, background
+        
+        if (iBitDepth == 16)
+            png_set_strip_16(png_ptr);
+        if (iColorType == PNG_COLOR_TYPE_PALETTE)
+            png_set_expand(png_ptr);
+        if (iBitDepth < 8)
+            png_set_expand(png_ptr);
+        if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
+            png_set_expand(png_ptr);
+        if (iColorType == PNG_COLOR_TYPE_GRAY ||
+            iColorType == PNG_COLOR_TYPE_GRAY_ALPHA)
+            png_set_gray_to_rgb(png_ptr);
+        
+        // set the background color to draw transparent and alpha images over.
+        if (png_get_bKGD(png_ptr, info_ptr, &pBackground))
+        {
+            png_set_background(png_ptr, pBackground, PNG_BACKGROUND_GAMMA_FILE, 1, 1.0);
+            pBkgColor->red   = (byte) pBackground->red;
+            pBkgColor->green = (byte) pBackground->green;
+            pBkgColor->blue  = (byte) pBackground->blue;
+        }
+        else
+        {
+            pBkgColor = NULL;
+        }
+        
+        // if required set gamma conversion
+        if (png_get_gAMA(png_ptr, info_ptr, &dGamma))
+            png_set_gamma(png_ptr, (double) 2.2, dGamma);
+        
+        // after the transformations have been registered update info_ptr data
+        
+        png_read_update_info(png_ptr, info_ptr);
+        
+        // get again width, height and the new bit-depth and color-type
+        
+        png_get_IHDR(png_ptr, info_ptr, piWidth, piHeight, &iBitDepth,
+            &iColorType, NULL, NULL, NULL);
+        
+        
+        // row_bytes is the width x number of channels
+        
+        ulRowBytes = png_get_rowbytes(png_ptr, info_ptr);
+        ulChannels = png_get_channels(png_ptr, info_ptr);
+        
+        *piChannels = ulChannels;
+        
+        // now we can allocate memory to store the image
+        
+        if (pbImageData)
+        {
+            free (pbImageData);
+            pbImageData = NULL;
+        }
+        if ((pbImageData = (png_byte *) malloc(ulRowBytes * (*piHeight)
+                            * sizeof(png_byte))) == NULL)
+        {
+            png_error(png_ptr, "Visual PNG: out of memory");
+        }
+        *ppbImageData = pbImageData;
+        
+        // and allocate memory for an array of row-pointers
+        
+        if ((ppbRowPointers = (png_bytepp) malloc((*piHeight)
+                            * sizeof(png_bytep))) == NULL)
+        {
+            png_error(png_ptr, "Visual PNG: out of memory");
+        }
+        
+        // set the individual row-pointers to point at the correct offsets
+        
+        for (i = 0; i < (*piHeight); i++)
+            ppbRowPointers[i] = pbImageData + i * ulRowBytes;
+        
+        // now we can go ahead and just read the whole image
+        
+        png_read_image(png_ptr, ppbRowPointers);
+        
+        // read the additional chunks in the PNG file (not really needed)
+        
+        png_read_end(png_ptr, NULL);
+        
+        // and we're done
+        
+        free (ppbRowPointers);
+        ppbRowPointers = NULL;
+        
+        // yepp, done
+    }
+
+    Catch (msg)
+    {
+        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
+
+        *ppbImageData = pbImageData = NULL;
+        
+        if(ppbRowPointers)
+            free (ppbRowPointers);
+
+        fclose(pfFile);
+
+        return FALSE;
+    }
+
+    fclose (pfFile);
+
+    return TRUE;
+}
+
+
+BOOL PngSaveImage (PTSTR pstrFileName, png_byte *pDiData,
+                   int iWidth, int iHeight, png_color bkgColor)
+{
+    const int           ciBitDepth = 8;
+    const int           ciChannels = 3;
+
+    static FILE        *pfFile;
+    png_uint_32         ulRowBytes;
+    static png_byte   **ppbRowPointers = NULL;
+    int                 i;
+
+    // open the PNG output file
+
+    if (!pstrFileName)
+        return FALSE;
+
+    if (!(pfFile = fopen(pstrFileName, "wb")))
+        return FALSE;
+
+    // prepare the standard PNG structures
+
+    png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL,
+      (png_error_ptr)png_cexcept_error, (png_error_ptr)NULL);
+    if (!png_ptr)
+    {
+        fclose(pfFile);
+        return FALSE;
+    }
+
+    info_ptr = png_create_info_struct(png_ptr);
+    if (!info_ptr) {
+        fclose(pfFile);
+        png_destroy_write_struct(&png_ptr, (png_infopp) NULL);
+        return FALSE;
+    }
+
+    Try
+    {
+        // initialize the png structure
+        
+#if !defined(PNG_NO_STDIO)
+        png_init_io(png_ptr, pfFile);
+#else
+        png_set_write_fn(png_ptr, (png_voidp)pfFile, png_write_data, png_flush);
+#endif
+        
+        // we're going to write a very simple 3x8 bit RGB image
+        
+        png_set_IHDR(png_ptr, info_ptr, iWidth, iHeight, ciBitDepth,
+            PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE,
+            PNG_FILTER_TYPE_BASE);
+        
+        // write the file header information
+        
+        png_write_info(png_ptr, info_ptr);
+        
+        // swap the BGR pixels in the DiData structure to RGB
+        
+        png_set_bgr(png_ptr);
+        
+        // row_bytes is the width x number of channels
+        
+        ulRowBytes = iWidth * ciChannels;
+        
+        // we can allocate memory for an array of row-pointers
+        
+        if ((ppbRowPointers = (png_bytepp) malloc(iHeight * sizeof(png_bytep))) == NULL)
+            Throw "Visualpng: Out of memory";
+        
+        // set the individual row-pointers to point at the correct offsets
+        
+        for (i = 0; i < iHeight; i++)
+            ppbRowPointers[i] = pDiData + i * (((ulRowBytes + 3) >> 2) << 2);
+        
+        // write out the entire image data in one call
+        
+        png_write_image (png_ptr, ppbRowPointers);
+        
+        // write the additional chunks to the PNG file (not really needed)
+        
+        png_write_end(png_ptr, info_ptr);
+        
+        // and we're done
+        
+        free (ppbRowPointers);
+        ppbRowPointers = NULL;
+        
+        // clean up after the write, and free any memory allocated
+        
+        png_destroy_write_struct(&png_ptr, (png_infopp) NULL);
+        
+        // yepp, done
+    }
+
+    Catch (msg)
+    {
+        png_destroy_write_struct(&png_ptr, (png_infopp) NULL);
+
+        if(ppbRowPointers)
+            free (ppbRowPointers);
+
+        fclose(pfFile);
+
+        return FALSE;
+    }
+    
+    fclose (pfFile);
+    
+    return TRUE;
+}
+
+#ifdef PNG_NO_STDIO
+
+static void
+png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
+{
+   png_size_t check;
+
+   /* 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.
+    */
+   check = (png_size_t)fread(data, (png_size_t)1, length,
+      (FILE *)png_ptr->io_ptr);
+
+   if (check != length)
+   {
+      png_error(png_ptr, "Read Error");
+   }
+}
+
+static void
+png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
+{
+   png_uint_32 check;
+
+   check = fwrite(data, 1, length, (FILE *)(png_ptr->io_ptr));
+   if (check != length)
+   {
+      png_error(png_ptr, "Write Error");
+   }
+}
+
+static void
+png_flush(png_structp png_ptr)
+{
+   FILE *io_ptr;
+   io_ptr = (FILE *)CVT_PTR((png_ptr->io_ptr));
+   if (io_ptr != NULL)
+      fflush(io_ptr);
+}
+
+#endif
+
+//-----------------
+//  end of source
+//-----------------

contrib/visupng/PngFile.h

@@ -0,0 +1,27 @@
+//------------------------------------------
+//  PNGFILE.H -- Header File for pngfile.c
+//------------------------------------------
+
+// Copyright 2000, Willem van Schaik.  For conditions of distribution and
+// use, see the copyright/license/disclaimer notice in png.h
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <windows.h>
+
+void PngFileInitialize (HWND hwnd) ;
+BOOL PngFileOpenDlg (HWND hwnd, PTSTR pstrFileName, PTSTR pstrTitleName) ;
+BOOL PngFileSaveDlg (HWND hwnd, PTSTR pstrFileName, PTSTR pstrTitleName) ;
+
+BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData, 
+                   int *piWidth, int *piHeight, int *piChannels, png_color *pBkgColor);
+BOOL PngSaveImage (PTSTR pstrFileName, png_byte *pDiData,
+                   int iWidth, int iHeight, png_color BkgColor);
+
+#if defined(PNG_NO_STDIO)
+static void png_read_data(png_structp png_ptr, png_bytep data, png_size_t length);
+static void png_write_data(png_structp png_ptr, png_bytep data, png_size_t length);
+static void png_flush(png_structp png_ptr);
+#endif
+

contrib/visupng/README.txt

@@ -0,0 +1,58 @@
+Microsoft Developer Studio Build File, Format Version 6.00 for VisualPng
+------------------------------------------------------------------------
+
+Copyright 2000, Willem van Schaik.  For conditions of distribution and
+use, see the copyright/license/disclaimer notice in png.h
+
+As a PNG .dll demo VisualPng is finished. More features would only hinder
+the program's objective. However, further extensions (like support for other 
+graphics formats) are in development. To get these, or for pre-compiled 
+binaries, go to "http://www.schaik.com/png/visualpng.html".
+
+------------------------------------------------------------------------
+
+Assumes that
+
+   libpng DLLs and LIBs are in ..\..\projects\msvc\win32\libpng
+   zlib DLLs and LIBs are in   ..\..\projects\msvc\win32\zlib
+   libpng header files are in  ..\..\..\libpng
+   zlib header files are in    ..\..\..\zlib
+   the pngsuite images are in  ..\pngsuite
+
+To build:
+
+1) On the main menu Select "Build|Set Active configuration".
+   Choose the configuration that corresponds to the library you want to test.
+   This library must have been built using the libpng MS project located in
+   the "..\..\mscv" subdirectory.
+
+2) Select "Build|Clean"
+
+3) Select "Build|Rebuild All"
+
+4) After compiling and linking VisualPng will be started to view an image
+   from the PngSuite directory.  Press Ctrl-N (and Ctrl-V) for other images.
+
+
+To install:
+
+When distributing VisualPng (or a further development) the following options
+are available:
+
+1) Build the program with the configuration "Win32 LIB" and you only need to
+   include the executable from the ./lib directory in your distribution.
+
+2) Build the program with the configuration "Win32 DLL" and you need to put
+   in your distribution the executable from the ./dll directory and the dll's
+   libpng1.dll, zlib.dll and msvcrt.dll.  These need to be in the user's PATH.
+
+
+Willem van Schaik
+Calgary, June 6th 2000
+
+P.S. VisualPng was written based on preliminary work of:
+
+    - Simon-Pierre Cadieux
+    - Glenn Randers-Pehrson
+    - Greg Roelofs
+

contrib/visupng/VisualPng.c

@@ -0,0 +1,961 @@
+//------------------------------------
+//  VisualPng.C -- Shows a PNG image
+//------------------------------------
+
+// Copyright 2000, Willem van Schaik.  For conditions of distribution and
+// use, see the copyright/license/disclaimer notice in png.h
+
+// switches
+
+// defines
+
+#define PROGNAME  "VisualPng"
+#define LONGNAME  "Win32 Viewer for PNG-files"
+#define VERSION   "1.0 of 2000 June 07"
+
+// constants
+
+#define MARGIN 8
+
+// standard includes
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <windows.h>
+
+// application includes
+
+#include "png.h"
+#include "pngfile.h"
+#include "resource.h"
+
+// macros
+
+// function prototypes
+
+LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);
+BOOL    CALLBACK AboutDlgProc (HWND, UINT, WPARAM, LPARAM) ;
+
+BOOL CenterAbout (HWND hwndChild, HWND hwndParent);
+
+BOOL BuildPngList (PTSTR pstrPathName, TCHAR **ppFileList, int *pFileCount,
+        int *pFileIndex);
+
+BOOL SearchPngList (TCHAR *pFileList, int FileCount, int *pFileIndex,
+        PTSTR pstrPrevName, PTSTR pstrNextName);
+
+BOOL LoadImageFile(HWND hwnd, PTSTR pstrPathName,
+        png_byte **ppbImage, int *pxImgSize, int *pyImgSize, int *piChannels,
+        png_color *pBkgColor);
+
+BOOL DisplayImage (HWND hwnd, BYTE **ppDib,
+        BYTE **ppDiData, int cxWinSize, int cyWinSize,
+        BYTE *pbImage, int cxImgSize, int cyImgSize, int cImgChannels,
+        BOOL bStretched);
+
+BOOL InitBitmap (
+        BYTE *pDiData, int cxWinSize, int cyWinSize);
+
+BOOL FillBitmap (
+        BYTE *pDiData, int cxWinSize, int cyWinSize,
+        BYTE *pbImage, int cxImgSize, int cyImgSize, int cImgChannels,
+        BOOL bStretched);
+
+// a few global variables
+
+static char *szProgName = PROGNAME;
+static char *szAppName = LONGNAME;
+static char *szIconName = PROGNAME;
+static char szCmdFileName [MAX_PATH];
+
+// MAIN routine
+
+int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
+                    PSTR szCmdLine, int iCmdShow)
+{
+    HACCEL   hAccel;
+    HWND     hwnd;
+    MSG      msg;
+    WNDCLASS wndclass;
+    int ixBorders, iyBorders;
+
+    wndclass.style         = CS_HREDRAW | CS_VREDRAW;
+    wndclass.lpfnWndProc   = WndProc;
+    wndclass.cbClsExtra    = 0;
+    wndclass.cbWndExtra    = 0;
+    wndclass.hInstance     = hInstance;
+    wndclass.hIcon         = LoadIcon (hInstance, szIconName) ;
+    wndclass.hCursor       = LoadCursor (NULL, IDC_ARROW);
+    wndclass.hbrBackground = NULL; // (HBRUSH) GetStockObject (GRAY_BRUSH);
+    wndclass.lpszMenuName  = szProgName;
+    wndclass.lpszClassName = szProgName;
+
+    if (!RegisterClass (&wndclass))
+    {
+        MessageBox (NULL, TEXT ("Error: this program requires Windows NT!"),
+            szProgName, MB_ICONERROR);
+        return 0;
+    }
+
+    // if filename given on commandline, store it
+    if ((szCmdLine != NULL) && (*szCmdLine != '\0'))
+        if (szCmdLine[0] == '"')
+            strncpy (szCmdFileName, szCmdLine + 1, strlen(szCmdLine) - 2);
+        else
+            strcpy (szCmdFileName, szCmdLine);
+    else
+        strcpy (szCmdFileName, "");
+
+    // calculate size of window-borders
+    ixBorders = 2 * (GetSystemMetrics (SM_CXBORDER) +
+                     GetSystemMetrics (SM_CXDLGFRAME));
+    iyBorders = 2 * (GetSystemMetrics (SM_CYBORDER) +
+                     GetSystemMetrics (SM_CYDLGFRAME)) +
+                     GetSystemMetrics (SM_CYCAPTION) +
+                     GetSystemMetrics (SM_CYMENUSIZE) +
+                     1; /* WvS: don't ask me why? */
+
+    hwnd = CreateWindow (szProgName, szAppName,
+        WS_OVERLAPPEDWINDOW,
+        CW_USEDEFAULT, CW_USEDEFAULT,
+        512 + 2 * MARGIN + ixBorders, 384 + 2 * MARGIN + iyBorders,
+//      CW_USEDEFAULT, CW_USEDEFAULT,
+        NULL, NULL, hInstance, NULL);
+
+    ShowWindow (hwnd, iCmdShow);
+    UpdateWindow (hwnd);
+
+    hAccel = LoadAccelerators (hInstance, szProgName);
+
+    while (GetMessage (&msg, NULL, 0, 0))
+    {
+        if (!TranslateAccelerator (hwnd, hAccel, &msg))
+        {
+            TranslateMessage (&msg);
+            DispatchMessage (&msg);
+        }
+    }
+    return msg.wParam;
+}
+
+LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam,
+        LPARAM lParam)
+{
+    static HINSTANCE          hInstance ;
+    static HDC                hdc;
+    static PAINTSTRUCT        ps;
+    static HMENU              hMenu;
+
+    static BITMAPFILEHEADER  *pbmfh;
+    static BITMAPINFOHEADER  *pbmih;
+    static BYTE              *pbImage;
+    static int                cxWinSize, cyWinSize;
+    static int                cxImgSize, cyImgSize;
+    static int                cImgChannels;
+    static png_color          bkgColor = {127, 127, 127};
+
+    static BOOL               bStretched = TRUE;
+
+    static BYTE              *pDib = NULL;
+    static BYTE              *pDiData = NULL;
+
+    static TCHAR              szImgPathName [MAX_PATH];
+    static TCHAR              szTitleName [MAX_PATH];
+
+    static TCHAR             *pPngFileList = NULL;
+    static int                iPngFileCount;
+    static int                iPngFileIndex;
+
+    BOOL                      bOk;
+
+    switch (message)
+    {
+    case WM_CREATE:
+        hInstance = ((LPCREATESTRUCT) lParam)->hInstance ;
+        PngFileInitialize (hwnd);
+
+        strcpy (szImgPathName, "");
+
+        // in case we process file given on command-line
+
+        if (szCmdFileName[0] != '\0')
+        {
+            strcpy (szImgPathName, szCmdFileName);
+
+            // read the other png-files in the directory for later
+            // next/previous commands
+
+            BuildPngList (szImgPathName, &pPngFileList, &iPngFileCount,
+                          &iPngFileIndex);
+
+            // load the image from file
+
+            if (!LoadImageFile (hwnd, szImgPathName,
+                &pbImage, &cxImgSize, &cyImgSize, &cImgChannels, &bkgColor))
+                return 0;
+
+            // invalidate the client area for later update
+
+            InvalidateRect (hwnd, NULL, TRUE);
+
+            // display the PNG into the DIBitmap
+
+            DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
+                pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
+        }
+
+        return 0;
+
+    case WM_SIZE:
+        cxWinSize = LOWORD (lParam);
+        cyWinSize = HIWORD (lParam);
+
+        // invalidate the client area for later update
+
+        InvalidateRect (hwnd, NULL, TRUE);
+
+        // display the PNG into the DIBitmap
+
+        DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
+            pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
+
+        return 0;
+
+    case WM_INITMENUPOPUP:
+        hMenu = GetMenu (hwnd);
+
+        if (pbImage)
+            EnableMenuItem (hMenu, IDM_FILE_SAVE, MF_ENABLED);
+        else
+            EnableMenuItem (hMenu, IDM_FILE_SAVE, MF_GRAYED);
+
+        return 0;
+
+    case WM_COMMAND:
+        hMenu = GetMenu (hwnd);
+
+        switch (LOWORD (wParam))
+        {
+        case IDM_FILE_OPEN:
+
+            // show the File Open dialog box
+
+            if (!PngFileOpenDlg (hwnd, szImgPathName, szTitleName))
+                return 0;
+
+            // read the other png-files in the directory for later
+            // next/previous commands
+
+            BuildPngList (szImgPathName, &pPngFileList, &iPngFileCount,
+                          &iPngFileIndex);
+
+            // load the image from file
+
+            if (!LoadImageFile (hwnd, szImgPathName,
+                &pbImage, &cxImgSize, &cyImgSize, &cImgChannels, &bkgColor))
+                return 0;
+
+            // invalidate the client area for later update
+
+            InvalidateRect (hwnd, NULL, TRUE);
+
+            // display the PNG into the DIBitmap
+
+            DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
+                pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
+
+            return 0;
+
+        case IDM_FILE_SAVE:
+
+            // show the File Save dialog box
+
+            if (!PngFileSaveDlg (hwnd, szImgPathName, szTitleName))
+                return 0;
+
+            // save the PNG to a disk file
+
+            SetCursor (LoadCursor (NULL, IDC_WAIT));
+            ShowCursor (TRUE);
+
+            bOk = PngSaveImage (szImgPathName, pDiData, cxWinSize, cyWinSize,
+                  bkgColor);
+
+            ShowCursor (FALSE);
+            SetCursor (LoadCursor (NULL, IDC_ARROW));
+
+            if (!bOk)
+                MessageBox (hwnd, TEXT ("Error in saving the PNG image"),
+                szProgName, MB_ICONEXCLAMATION | MB_OK);
+            return 0;
+
+        case IDM_FILE_NEXT:
+
+            // read next entry in the directory
+
+            if (SearchPngList (pPngFileList, iPngFileCount, &iPngFileIndex,
+                NULL, szImgPathName))
+            {
+                if (strcmp (szImgPathName, "") == 0)
+                    return 0;
+                
+                // load the image from file
+                
+                if (!LoadImageFile (hwnd, szImgPathName, &pbImage,
+                        &cxImgSize, &cyImgSize, &cImgChannels, &bkgColor))
+                    return 0;
+                
+                // invalidate the client area for later update
+                
+                InvalidateRect (hwnd, NULL, TRUE);
+                
+                // display the PNG into the DIBitmap
+                
+                DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
+                    pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
+            }
+            
+            return 0;
+
+        case IDM_FILE_PREVIOUS:
+
+            // read previous entry in the directory
+
+            if (SearchPngList (pPngFileList, iPngFileCount, &iPngFileIndex,
+                szImgPathName, NULL))
+            {
+                
+                if (strcmp (szImgPathName, "") == 0)
+                    return 0;
+                
+                // load the image from file
+                
+                if (!LoadImageFile (hwnd, szImgPathName, &pbImage, &cxImgSize,
+                    &cyImgSize, &cImgChannels, &bkgColor))
+                    return 0;
+                
+                // invalidate the client area for later update
+                
+                InvalidateRect (hwnd, NULL, TRUE);
+                
+                // display the PNG into the DIBitmap
+                
+                DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
+                    pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
+            }
+
+            return 0;
+
+        case IDM_FILE_EXIT:
+
+            // more cleanup needed...
+
+            // free image buffer
+
+            if (pDib != NULL)
+            {
+                free (pDib);
+                pDib = NULL;
+            }
+
+            // free file-list
+
+            if (pPngFileList != NULL)
+            {
+                free (pPngFileList);
+                pPngFileList = NULL;
+            }
+
+            // let's go ...
+
+            exit (0);
+
+            return 0;
+
+        case IDM_OPTIONS_STRETCH:
+            bStretched = !bStretched;
+            if (bStretched)
+                CheckMenuItem (hMenu, IDM_OPTIONS_STRETCH, MF_CHECKED);
+            else
+                CheckMenuItem (hMenu, IDM_OPTIONS_STRETCH, MF_UNCHECKED);
+
+            // invalidate the client area for later update
+
+            InvalidateRect (hwnd, NULL, TRUE);
+
+            // display the PNG into the DIBitmap
+
+            DisplayImage (hwnd, &pDib, &pDiData, cxWinSize, cyWinSize,
+                pbImage, cxImgSize, cyImgSize, cImgChannels, bStretched);
+
+            return 0;
+
+        case IDM_HELP_ABOUT:
+            DialogBox (hInstance, TEXT ("AboutBox"), hwnd, AboutDlgProc) ;
+            return 0;
+
+        } // end switch
+
+        break;
+
+    case WM_PAINT:
+        hdc = BeginPaint (hwnd, &ps);
+
+        if (pDib)
+            SetDIBitsToDevice (hdc, 0, 0, cxWinSize, cyWinSize, 0, 0,
+                0, cyWinSize, pDiData, (BITMAPINFO *) pDib, DIB_RGB_COLORS);
+
+        EndPaint (hwnd, &ps);
+        return 0;
+
+    case WM_DESTROY:
+        if (pbmfh)
+        {
+            free (pbmfh);
+            pbmfh = NULL;
+        }
+
+        PostQuitMessage (0);
+        return 0;
+    }
+
+    return DefWindowProc (hwnd, message, wParam, lParam);
+}
+
+BOOL CALLBACK AboutDlgProc (HWND hDlg, UINT message,
+                            WPARAM wParam, LPARAM lParam)
+{
+     switch (message)
+     {
+     case WM_INITDIALOG :
+          ShowWindow (hDlg, SW_HIDE);
+          CenterAbout (hDlg, GetWindow (hDlg, GW_OWNER));
+          ShowWindow (hDlg, SW_SHOW);
+          return TRUE ;
+
+     case WM_COMMAND :
+          switch (LOWORD (wParam))
+          {
+          case IDOK :
+          case IDCANCEL :
+               EndDialog (hDlg, 0) ;
+               return TRUE ;
+          }
+          break ;
+     }
+     return FALSE ;
+}
+
+//---------------
+//  CenterAbout
+//---------------
+
+BOOL CenterAbout (HWND hwndChild, HWND hwndParent)
+{
+   RECT    rChild, rParent, rWorkArea;
+   int     wChild, hChild, wParent, hParent;
+   int     xNew, yNew;
+   BOOL  bResult;
+
+   // Get the Height and Width of the child window
+   GetWindowRect (hwndChild, &rChild);
+   wChild = rChild.right - rChild.left;
+   hChild = rChild.bottom - rChild.top;
+
+   // Get the Height and Width of the parent window
+   GetWindowRect (hwndParent, &rParent);
+   wParent = rParent.right - rParent.left;
+   hParent = rParent.bottom - rParent.top;
+
+   // Get the limits of the 'workarea'
+   bResult = SystemParametersInfo(
+      SPI_GETWORKAREA,  // system parameter to query or set
+      sizeof(RECT),
+      &rWorkArea,
+      0);
+   if (!bResult) {
+      rWorkArea.left = rWorkArea.top = 0;
+      rWorkArea.right = GetSystemMetrics(SM_CXSCREEN);
+      rWorkArea.bottom = GetSystemMetrics(SM_CYSCREEN);
+   }
+
+   // Calculate new X position, then adjust for workarea
+   xNew = rParent.left + ((wParent - wChild) /2);
+   if (xNew < rWorkArea.left) {
+      xNew = rWorkArea.left;
+   } else if ((xNew+wChild) > rWorkArea.right) {
+      xNew = rWorkArea.right - wChild;
+   }
+
+   // Calculate new Y position, then adjust for workarea
+   yNew = rParent.top  + ((hParent - hChild) /2);
+   if (yNew < rWorkArea.top) {
+      yNew = rWorkArea.top;
+   } else if ((yNew+hChild) > rWorkArea.bottom) {
+      yNew = rWorkArea.bottom - hChild;
+   }
+
+   // Set it, and return
+   return SetWindowPos (hwndChild, NULL, xNew, yNew, 0, 0, SWP_NOSIZE |
+          SWP_NOZORDER);
+}
+
+//----------------
+//  BuildPngList
+//----------------
+
+BOOL BuildPngList (PTSTR pstrPathName, TCHAR **ppFileList, int *pFileCount,
+     int *pFileIndex)
+{
+    static TCHAR              szImgPathName [MAX_PATH];
+    static TCHAR              szImgFileName [MAX_PATH];
+    static TCHAR              szImgFindName [MAX_PATH];
+
+    WIN32_FIND_DATA           finddata;
+    HANDLE                    hFind;
+
+    static TCHAR              szTmp [MAX_PATH];
+    BOOL                      bOk;
+    int                       i, ii;
+    int                       j, jj;
+
+    // free previous file-list
+
+    if (*ppFileList != NULL)
+    {
+        free (*ppFileList);
+        *ppFileList = NULL;
+    }
+
+    // extract foldername, filename and search-name
+
+    strcpy (szImgPathName, pstrPathName);
+    strcpy (szImgFileName, strrchr (pstrPathName, '\\') + 1);
+
+    strcpy (szImgFindName, szImgPathName);
+    *(strrchr (szImgFindName, '\\') + 1) = '\0';
+    strcat (szImgFindName, "*.png");
+
+    // first cycle: count number of files in directory for memory allocation
+
+    *pFileCount = 0;
+
+    hFind = FindFirstFile(szImgFindName, &finddata);
+    bOk = (hFind != (HANDLE) -1);
+
+    while (bOk)
+    {
+        *pFileCount += 1;
+        bOk = FindNextFile(hFind, &finddata);
+    }
+    FindClose(hFind);
+
+    // allocation memory for file-list
+
+    *ppFileList = (TCHAR *) malloc (*pFileCount * MAX_PATH);
+
+    // second cycle: read directory and store filenames in file-list
+
+    hFind = FindFirstFile(szImgFindName, &finddata);
+    bOk = (hFind != (HANDLE) -1);
+
+    i = 0;
+    ii = 0;
+    while (bOk)
+    {
+        strcpy (*ppFileList + ii, szImgPathName);
+        strcpy (strrchr(*ppFileList + ii, '\\') + 1, finddata.cFileName);
+
+        if (strcmp(pstrPathName, *ppFileList + ii) == 0)
+            *pFileIndex = i;
+
+        ii += MAX_PATH;
+        i++;
+
+        bOk = FindNextFile(hFind, &finddata);
+    }
+    FindClose(hFind);
+
+    // finally we must sort the file-list
+
+    for (i = 0; i < *pFileCount - 1; i++)
+    {
+        ii = i * MAX_PATH;
+        for (j = i+1; j < *pFileCount; j++)
+        {
+            jj = j * MAX_PATH;
+            if (strcmp (*ppFileList + ii, *ppFileList + jj) > 0)
+            {
+                strcpy (szTmp, *ppFileList + jj);
+                strcpy (*ppFileList + jj, *ppFileList + ii);
+                strcpy (*ppFileList + ii, szTmp);
+
+                // check if this was the current image that we moved
+
+                if (*pFileIndex == i)
+                    *pFileIndex = j;
+                else
+                    if (*pFileIndex == j)
+                        *pFileIndex = i;
+            }
+        }
+    }
+
+    return TRUE;
+}
+
+//----------------
+//  SearchPngList
+//----------------
+
+BOOL SearchPngList (
+        TCHAR *pFileList, int FileCount, int *pFileIndex,
+        PTSTR pstrPrevName, PTSTR pstrNextName)
+{
+    if (FileCount > 0)
+    {
+        // get previous entry
+        
+        if (pstrPrevName != NULL)
+        {
+            if (*pFileIndex > 0)
+                *pFileIndex -= 1;
+            else
+                *pFileIndex = FileCount - 1;
+            
+            strcpy (pstrPrevName, pFileList + (*pFileIndex * MAX_PATH));
+        }
+        
+        // get next entry
+        
+        if (pstrNextName != NULL)
+        {
+            if (*pFileIndex < FileCount - 1)
+                *pFileIndex += 1;
+            else
+                *pFileIndex = 0;
+            
+            strcpy (pstrNextName, pFileList + (*pFileIndex * MAX_PATH));
+        }
+        
+        return TRUE;
+    }
+    else
+    {
+        return FALSE;
+    }
+}
+
+//-----------------
+//  LoadImageFile
+//-----------------
+
+BOOL LoadImageFile (HWND hwnd, PTSTR pstrPathName,
+                png_byte **ppbImage, int *pxImgSize, int *pyImgSize,
+                int *piChannels, png_color *pBkgColor)
+{
+    static TCHAR szTmp [MAX_PATH];
+
+    // if there's an existing PNG, free the memory
+
+    if (*ppbImage)
+    {
+        free (*ppbImage);
+        *ppbImage = NULL;
+    }
+
+    // Load the entire PNG into memory
+
+    SetCursor (LoadCursor (NULL, IDC_WAIT));
+    ShowCursor (TRUE);
+
+    PngLoadImage (pstrPathName, ppbImage, pxImgSize, pyImgSize, piChannels,
+                  pBkgColor);
+
+    ShowCursor (FALSE);
+    SetCursor (LoadCursor (NULL, IDC_ARROW));
+
+    if (*ppbImage != NULL)
+    {
+        sprintf (szTmp, "VisualPng - %s", strrchr(pstrPathName, '\\') + 1);
+        SetWindowText (hwnd, szTmp);
+    }
+    else
+    {
+        MessageBox (hwnd, TEXT ("Error in loading the PNG image"),
+            szProgName, MB_ICONEXCLAMATION | MB_OK);
+        return FALSE;
+    }
+
+    return TRUE;
+}
+
+//----------------
+//  DisplayImage
+//----------------
+
+BOOL DisplayImage (HWND hwnd, BYTE **ppDib,
+        BYTE **ppDiData, int cxWinSize, int cyWinSize,
+        BYTE *pbImage, int cxImgSize, int cyImgSize, int cImgChannels,
+        BOOL bStretched)
+{
+    BYTE                       *pDib = *ppDib;
+    BYTE                       *pDiData = *ppDiData;
+    // BITMAPFILEHEADER        *pbmfh;
+    BITMAPINFOHEADER           *pbmih;
+    WORD                        wDIRowBytes;
+    png_color                   bkgBlack = {0, 0, 0};
+    png_color                   bkgGray  = {127, 127, 127};
+    png_color                   bkgWhite = {255, 255, 255};
+
+    // allocate memory for the Device Independant bitmap
+
+    wDIRowBytes = (WORD) ((3 * cxWinSize + 3L) >> 2) << 2;
+
+    if (pDib)
+    {
+        free (pDib);
+        pDib = NULL;
+    }
+
+    if (!(pDib = (BYTE *) malloc (sizeof(BITMAPINFOHEADER) +
+        wDIRowBytes * cyWinSize)))
+    {
+        MessageBox (hwnd, TEXT ("Error in displaying the PNG image"),
+            szProgName, MB_ICONEXCLAMATION | MB_OK);
+        *ppDib = pDib = NULL;
+        return FALSE;
+    }
+    *ppDib = pDib;
+    memset (pDib, 0, sizeof(BITMAPINFOHEADER));
+
+    // initialize the dib-structure
+
+    pbmih = (BITMAPINFOHEADER *) pDib;
+    pbmih->biSize = sizeof(BITMAPINFOHEADER);
+    pbmih->biWidth = cxWinSize;
+    pbmih->biHeight = -((long) cyWinSize);
+    pbmih->biPlanes = 1;
+    pbmih->biBitCount = 24;
+    pbmih->biCompression = 0;
+    pDiData = pDib + sizeof(BITMAPINFOHEADER);
+    *ppDiData = pDiData;
+
+    // first fill bitmap with gray and image border
+
+    InitBitmap (pDiData, cxWinSize, cyWinSize);
+
+    // then fill bitmap with image
+
+    if (pbImage)
+    {
+        FillBitmap (
+            pDiData, cxWinSize, cyWinSize,
+            pbImage, cxImgSize, cyImgSize, cImgChannels,
+            bStretched);
+    }
+
+    return TRUE;
+}
+
+//--------------
+//  InitBitmap
+//--------------
+
+BOOL InitBitmap (BYTE *pDiData, int cxWinSize, int cyWinSize)
+{
+    BYTE *dst;
+    int x, y, col;
+
+    // initialize the background with gray
+
+    dst = pDiData;
+    for (y = 0; y < cyWinSize; y++)
+    {
+        col = 0;
+        for (x = 0; x < cxWinSize; x++)
+        {
+            // fill with GRAY
+            *dst++ = 127;
+            *dst++ = 127;
+            *dst++ = 127;
+            col += 3;
+        }
+        // rows start on 4 byte boundaries
+        while ((col % 4) != 0)
+        {
+            dst++;
+            col++;
+        }
+    }
+
+    return TRUE;
+}
+
+//--------------
+//  FillBitmap
+//--------------
+
+BOOL FillBitmap (
+        BYTE *pDiData, int cxWinSize, int cyWinSize,
+        BYTE *pbImage, int cxImgSize, int cyImgSize, int cImgChannels,
+        BOOL bStretched)
+{
+    BYTE *pStretchedImage;
+    BYTE *pImg;
+    BYTE *src, *dst;
+    BYTE r, g, b, a;
+    const int cDIChannels = 3;
+    WORD wImgRowBytes;
+    WORD wDIRowBytes;
+    int cxNewSize, cyNewSize;
+    int cxImgPos, cyImgPos;
+    int xImg, yImg;
+    int xWin, yWin;
+    int xOld, yOld;
+    int xNew, yNew;
+
+    if (bStretched)
+    {
+        cxNewSize = cxWinSize - 2 * MARGIN;
+        cyNewSize = cyWinSize - 2 * MARGIN;
+
+        // stretch the image to it's window determined size
+
+        // the following two are the same, but the first has side-effects
+        // because of rounding
+//      if ((cyNewSize / cxNewSize) > (cyImgSize / cxImgSize))
+        if ((cyNewSize * cxImgSize) > (cyImgSize * cxNewSize))
+        {
+            cyNewSize = cxNewSize * cyImgSize / cxImgSize;
+            cxImgPos = MARGIN;
+            cyImgPos = (cyWinSize - cyNewSize) / 2;
+        }
+        else
+        {
+            cxNewSize = cyNewSize * cxImgSize / cyImgSize;
+            cyImgPos = MARGIN;
+            cxImgPos = (cxWinSize - cxNewSize) / 2;
+        }
+
+        pStretchedImage = malloc (cImgChannels * cxNewSize * cyNewSize);
+        pImg = pStretchedImage;
+
+        for (yNew = 0; yNew < cyNewSize; yNew++)
+        {
+            yOld = yNew * cyImgSize / cyNewSize;
+            for (xNew = 0; xNew < cxNewSize; xNew++)
+            {
+                xOld = xNew * cxImgSize / cxNewSize;
+
+                r = *(pbImage + cImgChannels * ((yOld * cxImgSize) + xOld) + 0);
+                g = *(pbImage + cImgChannels * ((yOld * cxImgSize) + xOld) + 1);
+                b = *(pbImage + cImgChannels * ((yOld * cxImgSize) + xOld) + 2);
+                *pImg++ = r;
+                *pImg++ = g;
+                *pImg++ = b;
+                if (cImgChannels == 4)
+                {
+                    a = *(pbImage + cImgChannels * ((yOld * cxImgSize) + xOld)
+                        + 3);
+                    *pImg++ = a;
+                }
+            }
+        }
+
+        // calculate row-bytes
+
+        wImgRowBytes = cImgChannels * cxNewSize;
+        wDIRowBytes = (WORD) ((cDIChannels * cxWinSize + 3L) >> 2) << 2;
+
+        // copy image to screen
+
+        for (yImg = 0, yWin = cyImgPos; yImg < cyNewSize; yImg++, yWin++)
+        {
+            if (yWin >= cyWinSize - cyImgPos)
+                break;
+            src = pStretchedImage + yImg * wImgRowBytes;
+            dst = pDiData + yWin * wDIRowBytes + cxImgPos * cDIChannels;
+
+            for (xImg = 0, xWin = cxImgPos; xImg < cxNewSize; xImg++, xWin++)
+            {
+                if (xWin >= cxWinSize - cxImgPos)
+                    break;
+                r = *src++;
+                g = *src++;
+                b = *src++;
+                *dst++ = b; /* note the reverse order */
+                *dst++ = g;
+                *dst++ = r;
+                if (cImgChannels == 4)
+                {
+                    a = *src++;
+                }
+            }
+        }
+
+        // free memory
+
+        if (pStretchedImage != NULL)
+        {
+            free (pStretchedImage);
+            pStretchedImage = NULL;
+        }
+
+    }
+
+    // process the image not-stretched
+
+    else
+    {
+        // calculate the central position
+
+        cxImgPos = (cxWinSize - cxImgSize) / 2;
+        cyImgPos = (cyWinSize - cyImgSize) / 2;
+
+        // check for image larger than window
+
+        if (cxImgPos < MARGIN)
+            cxImgPos = MARGIN;
+        if (cyImgPos < MARGIN)
+            cyImgPos = MARGIN;
+
+        // calculate both row-bytes
+
+        wImgRowBytes = cImgChannels * cxImgSize;
+        wDIRowBytes = (WORD) ((cDIChannels * cxWinSize + 3L) >> 2) << 2;
+
+        // copy image to screen
+
+        for (yImg = 0, yWin = cyImgPos; yImg < cyImgSize; yImg++, yWin++)
+        {
+            if (yWin >= cyWinSize - MARGIN)
+                break;
+            src = pbImage + yImg * wImgRowBytes;
+            dst = pDiData + yWin * wDIRowBytes + cxImgPos * cDIChannels;
+
+            for (xImg = 0, xWin = cxImgPos; xImg < cxImgSize; xImg++, xWin++)
+            {
+                if (xWin >= cxWinSize - MARGIN)
+                    break;
+                r = *src++;
+                g = *src++;
+                b = *src++;
+                *dst++ = b; /* note the reverse order */
+                *dst++ = g;
+                *dst++ = r;
+                if (cImgChannels == 4)
+                {
+                    a = *src++;
+                }
+            }
+        }
+    }
+
+    return TRUE;
+}
+
+//-----------------
+//  end of source
+//-----------------

contrib/visupng/VisualPng.dsp

@@ -0,0 +1,223 @@
+# Microsoft Developer Studio Project File - Name="VisualPng" - Package Owner=<4>
+# Microsoft Developer Studio Generated Build File, Format Version 6.00
+
+# Copyright 2000, Willem van Schaik.  For conditions of distribution and
+# use, see the copyright/license/disclaimer notice in png.h
+
+# ** DO NOT EDIT **
+
+# TARGTYPE "Win32 (x86) Application" 0x0101
+
+CFG=VisualPng - Win32 Debug LIB
+!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 "VisualPng.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 "VisualPng.mak" CFG="VisualPng - Win32 Debug LIB"
+!MESSAGE 
+!MESSAGE Possible choices for configuration are:
+!MESSAGE 
+!MESSAGE "VisualPng - Win32 DLL" (based on "Win32 (x86) Application")
+!MESSAGE "VisualPng - Win32 Debug DLL" (based on "Win32 (x86) Application")
+!MESSAGE "VisualPng - Win32 LIB" (based on "Win32 (x86) Application")
+!MESSAGE "VisualPng - Win32 Debug LIB" (based on "Win32 (x86) Application")
+!MESSAGE 
+
+# Begin Project
+# PROP AllowPerConfigDependencies 0
+# PROP Scc_ProjName ""
+# PROP Scc_LocalPath ""
+CPP=cl.exe
+MTL=midl.exe
+RSC=rc.exe
+
+!IF  "$(CFG)" == "VisualPng - Win32 DLL"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "VisualPng___Win32_DLL"
+# PROP BASE Intermediate_Dir "VisualPng___Win32_DLL"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir "dll"
+# PROP Intermediate_Dir "dll"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /GX /O2 /I "libpng" /I "zlib" /D "PNG_USE_DLL" /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /D "_MBCS" /YX /FD /c
+# ADD CPP /nologo /W3 /GX /O2 /I "..\..\..\libpng" /I "..\..\..\zlib" /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /D "_MBCS" /D "PNG_USE_DLL" /D "PNG_NO_STDIO" /D "PNG_NO_GLOBAL_ARRAYS" /FD /c
+# SUBTRACT CPP /YX
+# ADD BASE MTL /nologo /D "NDEBUG" /mktyplib203 /win32
+# ADD MTL /nologo /D "NDEBUG" /mktyplib203 /win32
+# ADD BASE RSC /l 0x409 /d "NDEBUG"
+# ADD RSC /l 0x409 /d "NDEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 libpng3.lib zlibd.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /machine:I386 /libpath:"libpng" /libpath:"zlib"
+# ADD LINK32 libpng3.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /machine:I386 /libpath:"..\..\projects\msvc\win32\libpng\dll"
+# Begin Special Build Tool
+OutDir=.\dll
+SOURCE="$(InputPath)"
+PostBuild_Cmds=set path=..\..\projects\msvc\win32\libpng\dll;..\..\projects\msvc\win32\zlib\dll;	$(outdir)\VisualPng.exe ..\..\contrib\pngsuite\basn6a16.png
+# End Special Build Tool
+
+!ELSEIF  "$(CFG)" == "VisualPng - Win32 Debug DLL"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 1
+# PROP BASE Output_Dir "VisualPng___Win32_Debug_DLL"
+# PROP BASE Intermediate_Dir "VisualPng___Win32_Debug_DLL"
+# PROP BASE Ignore_Export_Lib 0
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 1
+# PROP Output_Dir "dll_dbg"
+# PROP Intermediate_Dir "dll_dbg"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /Gm /GX /ZI /Od /I "libpng" /I "zlib" /D "PNG_USE_DLL" /D "WIN32" /D "_DEBUG" /D "_WINDOWS" /D "_MBCS" /YX /FD /GZ /c
+# ADD CPP /nologo /W3 /Gm /GX /ZI /Od /I "..\..\..\libpng" /I "..\..\..\zlib" /D "WIN32" /D "_DEBUG" /D "_WINDOWS" /D "_MBCS" /D "PNG_USE_DLL" /D "PNG_NO_STDIO" /D "PNG_NO_GLOBAL_ARRAYS" /FD /GZ /c
+# SUBTRACT CPP /YX
+# ADD BASE MTL /nologo /D "_DEBUG" /mktyplib203 /win32
+# ADD MTL /nologo /D "_DEBUG" /mktyplib203 /win32
+# ADD BASE RSC /l 0x409 /d "_DEBUG"
+# ADD RSC /l 0x409 /d "_DEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 libpng3.lib zlibd.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /debug /machine:I386 /nodefaultlib:"libc" /pdbtype:sept /libpath:"libpng" /libpath:"zlib"
+# SUBTRACT BASE LINK32 /nodefaultlib
+# ADD LINK32 libpng3d.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /debug /machine:I386 /nodefaultlib:"libc" /pdbtype:sept /libpath:"..\..\projects\msvc\win32\libpng\dll_dbg"
+# SUBTRACT LINK32 /nodefaultlib
+# Begin Special Build Tool
+OutDir=.\dll_dbg
+SOURCE="$(InputPath)"
+PostBuild_Cmds=set path=..\..\projects\msvc\win32\libpng\dll_dbg;..\..\projects\msvc\win32\zlib\dll_dbg;	$(outdir)\VisualPng.exe ..\..\contrib\pngsuite\basn6a16.png
+# End Special Build Tool
+
+!ELSEIF  "$(CFG)" == "VisualPng - Win32 LIB"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "VisualPng___Win32_LIB"
+# PROP BASE Intermediate_Dir "VisualPng___Win32_LIB"
+# PROP BASE Ignore_Export_Lib 0
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir "lib"
+# PROP Intermediate_Dir "lib"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /GX /O2 /I "..\..\..\libpng" /I "..\..\..\zlib" /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /D "_MBCS" /D "PNG_USE_DLL" /D "PNG_NO_STDIO" /D "PNG_NO_GLOBAL_ARRAYS" /FD /c
+# SUBTRACT BASE CPP /YX
+# ADD CPP /nologo /W3 /GX /O2 /I "..\..\..\libpng" /I "..\..\..\zlib" /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /D "_MBCS" /D "PNG_NO_STDIO" /D "PNG_NO_GLOBAL_ARRAYS" /FD /c
+# SUBTRACT CPP /YX
+# ADD BASE MTL /nologo /D "NDEBUG" /mktyplib203 /win32
+# ADD MTL /nologo /D "NDEBUG" /mktyplib203 /win32
+# ADD BASE RSC /l 0x409 /d "NDEBUG"
+# ADD RSC /l 0x409 /d "NDEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 libpng3.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /machine:I386 /libpath:"..\..\projects\msvc\win32\libpng\dll"
+# ADD LINK32 libpng.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /machine:I386 /libpath:"..\..\projects\msvc\win32\libpng\lib"
+# Begin Special Build Tool
+OutDir=.\lib
+SOURCE="$(InputPath)"
+PostBuild_Cmds=$(outdir)\VisualPng.exe ..\..\contrib\pngsuite\basn6a16.png
+# End Special Build Tool
+
+!ELSEIF  "$(CFG)" == "VisualPng - Win32 Debug LIB"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 1
+# PROP BASE Output_Dir "VisualPng___Win32_Debug_LIB"
+# PROP BASE Intermediate_Dir "VisualPng___Win32_Debug_LIB"
+# PROP BASE Ignore_Export_Lib 0
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 1
+# PROP Output_Dir "lib_dbg"
+# PROP Intermediate_Dir "lib_dbg"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+# ADD BASE CPP /nologo /W3 /Gm /GX /ZI /Od /I "..\..\..\libpng" /I "..\..\..\zlib" /D "WIN32" /D "_DEBUG" /D "_WINDOWS" /D "_MBCS" /D "PNG_USE_DLL" /D "PNG_NO_STDIO" /D "PNG_NO_GLOBAL_ARRAYS" /YX /FD /GZ /c
+# ADD CPP /nologo /W3 /Gm /GX /ZI /Od /I "..\..\..\libpng" /I "..\..\..\zlib" /D "WIN32" /D "_DEBUG" /D "_WINDOWS" /D "_MBCS" /D "PNG_NO_STDIO" /D "PNG_NO_GLOBAL_ARRAYS" /FD /GZ /c
+# SUBTRACT CPP /YX
+# ADD BASE MTL /nologo /D "_DEBUG" /mktyplib203 /win32
+# ADD MTL /nologo /D "_DEBUG" /mktyplib203 /win32
+# ADD BASE RSC /l 0x409 /d "_DEBUG"
+# ADD RSC /l 0x409 /d "_DEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 libpng3d.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /debug /machine:I386 /nodefaultlib:"libc" /pdbtype:sept /libpath:"..\..\projects\msvc\win32\libpng\dll_dbg"
+# SUBTRACT BASE LINK32 /nodefaultlib
+# ADD LINK32 libpng.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /debug /machine:I386 /nodefaultlib:"libc" /pdbtype:sept /libpath:"..\..\projects\msvc\win32\libpng\lib_dbg"
+# SUBTRACT LINK32 /nodefaultlib
+# Begin Special Build Tool
+OutDir=.\lib_dbg
+SOURCE="$(InputPath)"
+PostBuild_Cmds=$(outdir)\VisualPng.exe ..\..\contrib\pngsuite\basn6a16.png
+# End Special Build Tool
+
+!ENDIF 
+
+# Begin Target
+
+# Name "VisualPng - Win32 DLL"
+# Name "VisualPng - Win32 Debug DLL"
+# Name "VisualPng - Win32 LIB"
+# Name "VisualPng - Win32 Debug LIB"
+# Begin Group "Source Files"
+
+# PROP Default_Filter "cpp;c;cxx;rc;def;r;odl;idl;hpj;bat"
+# Begin Source File
+
+SOURCE=.\PngFile.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\VisualPng.c
+# End Source File
+# End Group
+# Begin Group "Header Files"
+
+# PROP Default_Filter "h;hpp;hxx;hm;inl"
+# Begin Source File
+
+SOURCE=.\cexcept.h
+# End Source File
+# Begin Source File
+
+SOURCE=.\PngFile.h
+# End Source File
+# Begin Source File
+
+SOURCE=.\resource.h
+# End Source File
+# End Group
+# Begin Group "Resource Files"
+
+# PROP Default_Filter "ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe"
+# Begin Source File
+
+SOURCE=.\VisualPng.ico
+# End Source File
+# Begin Source File
+
+SOURCE=.\VisualPng.rc
+# End Source File
+# End Group
+# End Target
+# End Project

contrib/visupng/VisualPng.dsw

@@ -0,0 +1,29 @@
+Microsoft Developer Studio Workspace File, Format Version 6.00
+# WARNING: DO NOT EDIT OR DELETE THIS WORKSPACE FILE!
+
+###############################################################################
+
+Project: "VisualPng"=.\VisualPng.dsp - Package Owner=<4>
+
+Package=<5>
+{{{
+}}}
+
+Package=<4>
+{{{
+}}}
+
+###############################################################################
+
+Global:
+
+Package=<5>
+{{{
+}}}
+
+Package=<3>
+{{{
+}}}
+
+###############################################################################
+

contrib/visupng/VisualPng.rc

@@ -0,0 +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
+

contrib/visupng/cexcept.h

@@ -0,0 +1,244 @@
+/*===
+cexcept.h 1.0.0 (2000-Jun-21-Wed)
+Adam M. Costello <amc@cs.berkeley.edu>
+
+An interface for exception-handling in ANSI C, developed jointly with
+Cosmin Truta <cosmin@cs.toronto.edu>.
+
+    Copyright (c) 2000 Adam M. Costello and Cosmin Truta.  Everyone
+    is hereby granted permission to do whatever they like with this
+    file, provided that if they modify it they take reasonable steps to
+    avoid confusing or misleading people about the authors, version,
+    and terms of use of the derived file.  The copyright holders make
+    no guarantees about the correctness of this file, and are not
+    responsible for any damage resulting from its use.
+
+If this interface is used by multiple .c files, they shouldn't include
+this header file directly.  Instead, create a wrapper header file that
+includes this header file and then invokes the define_exception_type
+macro (see below), and let your .c files include that header file.
+
+The interface consists of one type, one well-known name, and six macros.
+
+
+define_exception_type(type_name);
+
+    This macro is used like an external declaration.  It specifies
+    the type of object that gets copied from the exception thrower to
+    the exception catcher.  The type_name can be any type that can be
+    assigned to, that is, a non-constant arithmetic type, struct, union,
+    or pointer.  Examples:
+
+        define_exception_type(int);
+
+        enum exception { out_of_memory, bad_arguments, disk_full };
+        define_exception_type(enum exception);
+
+        struct exception { int code; const char *msg; };
+        define_exception_type(struct exception);
+
+
+struct exception_context;
+
+    This type may be used after the define_exception_type() macro has
+    been invoked.  A struct exception_context must be known to both
+    the thrower and the catcher.  It is expected that there be one
+    context for each thread that uses exceptions.  It would certainly
+    be dangerous for multiple threads to access the same context.
+    One thread can use multiple contexts, but that is likely to be
+    confusing and not typically useful.  The application can allocate
+    this structure in any way it pleases--automatic, static, or dynamic.
+    The application programmer should pretend not to know the structure
+    members, which are subject to change.
+
+
+struct exception_context *the_exception_context;
+
+    The Try/Catch and Throw statements (described below) implicitly
+    refer to a context, using the name the_exception_context.  It is
+    the application's responsibility to make sure that this name yields
+    the address of a mutable (non-constant) struct exception_context
+    wherever those statements are used.  Subject to that constraint, the
+    application may declare a variable of this name anywhere it likes
+    (inside a function, in a parameter list, or externally), and may
+    use whatever storage class specifiers (static, extern, etc) or type
+    qualifiers (const, volatile) it likes.  Examples:
+
+        static struct exception_context
+          * const the_exception_context = &foo;
+
+        { struct exception_context *the_exception_context = bar; ... }
+
+        int blah(struct exception_context *the_exception_context, ...);
+
+        extern struct exception_context the_exception_context[1];
+
+    The last example illustrates a trick that avoids creating a pointer
+    object separate from the structure object.
+
+    The name could even be a macro, for example:
+
+        struct exception_context ec_array[numthreads];
+        #define the_exception_context (ec_array + thread_id)
+
+    Be aware that the_exception_context is used several times by the
+    Try/Catch/Throw macros, so it shouldn't be expensive or have side
+    effects.  The expansion must be a drop-in replacement for an
+    identifier, so it's safest to put parentheses around it.
+
+
+void init_exception_context(struct exception_context *ec);
+
+    For context structures allocated statically (by an external
+    definition or using the "static" keyword), the implicit
+    initialization to all zeros is sufficient, but contexts allocated
+    by other means must be initialized using this macro before they
+    are used by a Try/Catch statement.  It does no harm to initialize
+    a context more than once (by using this macro on a statically
+    allocated context, or using this macro twice on the same context),
+    but a context must not be re-initialized after it has been used by a
+    Try/Catch statement.
+
+
+Try statement
+Catch (expression) statement
+
+    The Try/Catch/Throw macros are capitalized in order to avoid
+    confusion with the C++ keywords, which have subtly different
+    semantics.
+
+    A Try/Catch statement has a syntax similar to an if/else
+    statement, except that the parenthesized expression goes after
+    the second keyword rather than the first.  As with if/else,
+    there are two clauses, each of which may be a simple statement
+    ending with a semicolon or a brace-enclosed compound statement.
+    But whereas the else clause is optional, the Catch clause is
+    required.  The expression must be a modifiable lvalue (something
+    capable of being assigned to) of the exact same type passed to
+    define_exception_type().
+
+    If a Throw that uses the same exception context as the Try/Catch is
+    executed within the Try clause (typically within a function called
+    by the Try clause), and the exception is not caught by a nested
+    Try/Catch statement, then a copy of the exception will be assigned
+    to the expression, and control will jump to the Catch clause.  If no
+    such Throw is executed, then the assignment is not performed, and
+    the Catch clause is not executed.
+
+    Regardless of whether an exception is caught, the expression is
+    always evaluated exactly once, which is significant if it has side
+    effects, for example:
+
+        Try foo();
+        Catch (p[++i].e) { ... }
+
+    IMPORTANT: Jumping into or out of a Try clause (for example via
+    return, break, continue, goto, longjmp) is forbidden--the compiler
+    will not complain, but bad things will happen at run-time.  Jumping
+    into or out of a Catch clause is okay, and so is jumping around
+    inside a Try clause.  In many cases where one is tempted to return
+    from a Try clause, it will suffice to use Throw, and then return
+    from the Catch clause.  Another option is to set a flag variable and
+    use goto to jump to the end of the Try clause, then check the flag
+    after the Try/Catch statement.
+
+    IMPORTANT: The values of any non-volatile automatic variables
+    changed within the Try clause are undefined after an exception is
+    caught.  Therefore, variables modified inside the Try block whose
+    values are needed later outside the Try block must either use static
+    storage or be declared with the "volatile" type qualifier.
+
+
+Throw expression;
+
+    A Throw statement is very much like a return statement, except that
+    the expression is required.  Whereas return jumps back to the place
+    where the current function was called, Throw jumps back to the Catch
+    clause of the innermost enclosing Try clause.  The expression must
+    be compatible with the type passed to define_exception_type().  The
+    exception must be caught, otherwise the program may crash.
+
+    Slight limitation:  If the expression is a comma-expression it must
+    be enclosed in parentheses.
+
+
+Try statement
+Catch_anonymous statement
+
+    When the value of the exception is not needed, a Try/Catch statement
+    can use Catch_anonymous instead of Catch (expression).
+
+
+Everything below this point is for the benefit of the compiler.  The
+application programmer should pretend not to know any of it, because it
+is subject to change.
+
+===*/
+
+
+#ifndef CEXCEPT_H
+#define CEXCEPT_H
+
+
+#include <setjmp.h>
+
+#define define_exception_type(etype) \
+struct exception__state { \
+  etype *exception; \
+  jmp_buf env; \
+}
+
+struct exception_context { \
+  struct exception__state *last; \
+  int caught; \
+};
+
+#define init_exception_context(ec) ((void)((ec)->last = 0))
+
+#define Catch(e) exception__catch(&(e))
+#define Catch_anonymous exception__catch(0)
+
+#define Try \
+  { \
+    struct exception__state *exception__p, exception__s; \
+    int exception__i; \
+    exception__p = the_exception_context->last; \
+    the_exception_context->last = &exception__s; \
+    for (exception__i = 0; ; exception__i = 1) \
+      if (exception__i) { \
+        if (setjmp(exception__s.env) == 0) { \
+          if (&exception__s)
+
+#define exception__catch(e_addr) \
+          else { } \
+          the_exception_context->caught = 0; \
+        } \
+        else the_exception_context->caught = 1; \
+        the_exception_context->last = exception__p; \
+        break; \
+      } \
+      else exception__s.exception = e_addr; \
+  } \
+  if (!the_exception_context->caught) { } \
+  else
+
+/* Try ends with if(), and Catch begins and ends with else.  This     */
+/* ensures that the Try/Catch syntax is really the same as the        */
+/* if/else syntax.                                                    */
+/*                                                                    */
+/* We use &exception__s instead of 1 to appease compilers that        */
+/* warn about constant expressions inside if().  Most compilers       */
+/* should still recognize that &exception__s is never zero and avoid  */
+/* generating test code.                                              */
+/*                                                                    */
+/* We use the variable exception__i to start the loop at the bottom,  */
+/* rather than jump into the loop using a switch statement, to        */
+/* appease compilers that warn about jumping into loops.              */
+
+#define Throw \
+  for (;; longjmp(the_exception_context->last->env, 1)) \
+    if (the_exception_context->last->exception) \
+      *the_exception_context->last->exception =
+
+
+#endif /* CEXCEPT_H */

contrib/visupng/resource.h

@@ -0,0 +1,23 @@
+//{{NO_DEPENDENCIES}}
+// Microsoft Developer Studio generated include file.
+// Used by VisualPng.rc
+//
+#define IDM_FILE_OPEN                   40001
+#define IDM_FILE_SAVE                   40002
+#define IDM_FILE_NEXT                   40003
+#define IDM_FILE_PREVIOUS               40004
+#define IDM_FILE_EXIT                   40005
+#define IDM_OPTIONS_BACKGROUND          40006
+#define IDM_OPTIONS_STRETCH             40007
+#define IDM_HELP_ABOUT                  40008
+
+// Next default values for new objects
+// 
+#ifdef APSTUDIO_INVOKED
+#ifndef APSTUDIO_READONLY_SYMBOLS
+#define _APS_NEXT_RESOURCE_VALUE        113
+#define _APS_NEXT_COMMAND_VALUE         40009
+#define _APS_NEXT_CONTROL_VALUE         1001
+#define _APS_NEXT_SYMED_VALUE           101
+#endif
+#endif

example.c

@@ -84,7 +84,7 @@ void read_png(char *file_name)  /* We need to open the file */
    FILE *fp;
 
    if ((fp = fopen(file_name, "rb")) == NULL)
-      return;
+      return (ERROR);
 #else no_open_file /* prototype 2 */
 void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
 {
@@ -106,7 +106,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
    if (png_ptr == NULL)
    {
       fclose(fp);
-      return;
+      return (ERROR);
    }
 
    /* Allocate/initialize the memory for image information.  REQUIRED. */
@@ -114,8 +114,8 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
    if (info_ptr == NULL)
    {
       fclose(fp);
-      png_destroy_read_struct(&png_ptr, (png_infopp)NULL, (png_infopp)NULL);
-      return;
+      png_destroy_read_struct(&png_ptr, png_infopp_NULL, png_infopp_NULL);
+      return (ERROR);
    }
 
    /* Set error handling if you are using the setjmp/longjmp method (this is
@@ -126,10 +126,10 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
    if (setjmp(png_jmpbuf(png_ptr)))
    {
       /* Free all of the memory associated with the png_ptr and info_ptr */
-      png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
+      png_destroy_read_struct(&png_ptr, &info_ptr, png_infopp_NULL);
       fclose(fp);
       /* If we get here, we had a problem reading the file */
-      return;
+      return (ERROR);
    }
 
    /* One of the following I/O initialization methods is REQUIRED */
@@ -157,7 +157,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
     * adjustment), then you can read the entire image (including
     * pixels) into the info structure with this call:
     */
-   png_read_png(png_ptr, info_ptr, png_transforms, NULL);
+   png_read_png(png_ptr, info_ptr, png_transforms, png_voidp_NULL);
 #else
    /* OK, you're doing it the hard way, with the lower-level functions */
 
@@ -167,7 +167,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
    png_read_info(png_ptr, info_ptr);
 
    png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
-       &interlace_type, NULL, NULL);
+       &interlace_type, int_p_NULL, int_p_NULL);
 
 /**** Set up the data transformations you want.  Note that these are all
  **** optional.  Only call them if you want/need them.  Many of the
@@ -194,17 +194,17 @@ 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_expand(png_ptr);
+      png_set_palette_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)
-      png_set_expand(png_ptr);
+      png_set_gray_1_2_4_to_8(png_ptr);
 
    /* Expand paletted or RGB images with transparency to full alpha channels
     * so the data will be available as RGBA quartets.
     */
    if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
-      png_set_expand(png_ptr);
+      png_set_tRNS_to_alpha(png_ptr);
 
    /* Set the background color to draw transparent and alpha images over.
     * It is possible to set the red, green, and blue components directly
@@ -267,7 +267,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
     */
    if (color_type & PNG_COLOR_MASK_COLOR)
    {
-      png_uint_32 num_palette;
+      int num_palette;
       png_colorp palette;
 
       /* This reduces the image to the application supplied palette */
@@ -277,12 +277,12 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
          png_color std_color_cube[MAX_SCREEN_COLORS];
 
          png_set_dither(png_ptr, std_color_cube, MAX_SCREEN_COLORS,
-            MAX_SCREEN_COLORS, NULL, 0);
+            MAX_SCREEN_COLORS, png_uint_16p_NULL, 0);
       }
       /* This reduces the image to the palette supplied in the file */
       else if (png_get_PLTE(png_ptr, info_ptr, &palette, &num_palette))
       {
-         png_color16p histogram;
+         png_uint_16p histogram;
 
          png_get_hIST(png_ptr, info_ptr, &histogram);
 
@@ -291,7 +291,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
       }
    }
 
-   /* invert monocrome files to have 0 as white and 1 as black */
+   /* invert monochrome files to have 0 as white and 1 as black */
    png_set_invert_mono(png_ptr);
 
    /* If you want to shift the pixel values from the range [0,255] or
@@ -338,7 +338,8 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
 
    for (row = 0; row < height; row++)
    {
-      row_pointers[row] = malloc(png_get_rowbytes(png_ptr, info_ptr));
+      row_pointers[row] = png_malloc(png_ptr, png_get_rowbytes(png_ptr,
+         info_ptr));
    }
 
    /* Now it's time to read the image.  One of these methods is REQUIRED */
@@ -353,18 +354,18 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
 #ifdef single /* Read the image a single row at a time */
       for (y = 0; y < height; y++)
       {
-         png_read_rows(png_ptr, &row_pointers[y], NULL, 1);
+         png_read_rows(png_ptr, &row_pointers[y], png_bytepp_NULL, 1);
       }
 
 #else no_single /* Read the image several rows at a time */
       for (y = 0; y < height; y += number_of_rows)
       {
 #ifdef sparkle /* Read the image using the "sparkle" effect. */
-         png_read_rows(png_ptr, &row_pointers[y], NULL, number_of_rows);
-
-         png_read_rows(png_ptr, NULL, row_pointers[y], number_of_rows);
+         png_read_rows(png_ptr, &row_pointers[y], png_bytepp_NULL,
+            number_of_rows);
 #else no_sparkle /* Read the image using the "rectangle" effect */
-         png_read_rows(png_ptr, NULL, &row_pointers[y], number_of_rows);
+         png_read_rows(png_ptr, png_bytepp_NULL, &row_pointers[y],
+            number_of_rows);
 #endif no_sparkle /* use only one of these two methods */
       }
 
@@ -381,13 +382,13 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
    /* At this point you have read the entire image */
 
    /* clean up after the read, and free any memory allocated - REQUIRED */
-   png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
+   png_destroy_read_struct(&png_ptr, &info_ptr, png_infopp_NULL);
 
    /* close the file */
    fclose(fp);
 
    /* that's it */
-   return;
+   return (OK);
 }
 
 /* progressively read a file */
@@ -407,21 +408,21 @@ initialize_png_reader(png_structp *png_ptr, png_infop *info_ptr)
    if (*png_ptr == NULL)
    {
       *info_ptr = NULL;
-      return ERROR;
+      return (ERROR);
    }
 
    *info_ptr = png_create_info_struct(png_ptr);
 
    if (*info_ptr == NULL)
    {
-      png_destroy_read_struct(png_ptr, info_ptr, (png_infopp)NULL);
-      return ERROR;
+      png_destroy_read_struct(png_ptr, info_ptr, png_infopp_NULL);
+      return (ERROR);
    }
 
    if (setjmp(png_jmpbuf((*png_ptr))))
    {
-      png_destroy_read_struct(png_ptr, info_ptr, (png_infopp)NULL);
-      return ERROR;
+      png_destroy_read_struct(png_ptr, info_ptr, png_infopp_NULL);
+      return (ERROR);
    }
 
    /* This one's new.  You will need to provide all three
@@ -439,7 +440,7 @@ initialize_png_reader(png_structp *png_ptr, png_infop *info_ptr)
    png_set_progressive_read_fn(*png_ptr, (void *)stream_data,
       info_callback, row_callback, end_callback);
 
-   return OK;
+   return (OK);
 }
 
 int
@@ -449,8 +450,8 @@ process_data(png_structp *png_ptr, png_infop *info_ptr,
    if (setjmp(png_jmpbuf((*png_ptr))))
    {
       /* Free the png_ptr and info_ptr memory on error */
-      png_destroy_read_struct(png_ptr, info_ptr, (png_infopp)NULL);
-      return ERROR;
+      png_destroy_read_struct(png_ptr, info_ptr, png_infopp_NULL);
+      return (ERROR);
    }
 
    /* This one's new also.  Simply give it chunks of data as
@@ -464,7 +465,7 @@ process_data(png_structp *png_ptr, png_infop *info_ptr,
     * callback, if you aren't already displaying them there.
     */
    png_process_data(*png_ptr, *info_ptr, buffer, length);
-   return OK;
+   return (OK);
 }
 
 info_callback(png_structp png_ptr, png_infop info)
@@ -481,21 +482,47 @@ info_callback(png_structp png_ptr, png_infop info)
 row_callback(png_structp png_ptr, png_bytep new_row,
    png_uint_32 row_num, int pass)
 {
-/* this function is called for every row in the image.  If the
- * image is interlacing, and you turned on the interlace handler,
+/*
+ * This function is called for every row in the image.  If the
+ * image is interlaced, and you turned on the interlace handler,
  * this function will be called for every row in every pass.
- * Some of these rows will not be changed from the previous pass.
- * When the row is not changed, the new_row variable will be NULL.
+ *
+ * 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:
+ */
+   /* Check if row_num is in bounds. */
+   if((row_num >= 0) && (row_num < height))
+   {
+     /* Get pointer to corresponding row in our
+      * PNG read buffer.
+      */
+     png_bytep old_row = ((png_bytep *)our_data)[row_num];
+
+     /* If both rows are allocated then copy the new row
+      * data to the corresponding row data.
+      */
+     if((old_row != NULL) && (new_row != NULL))
+     png_progressive_combine_row(png_ptr, old_row, new_row);
+   }
+/*
  * The rows and passes are called in order, so you don't really
  * need the row_num and pass, but I'm supplying them because it
  * may make your life easier.
  *
  * For the non-NULL rows of interlaced images, you must call
- * png_progressive_combine_row() passing in the row and the
- * old row.  You can call this function for NULL rows (it will
- * just return) and for non-interlaced images (it just does the
- * memcpy for you) if it will make the code easier.  Thus, you
- * can just do this for all cases:
+ * png_progressive_combine_row() passing in the new row and the
+ * old row, as demonstrated above.  You can call this function for
+ * NULL rows (it will just return) and for non-interlaced images
+ * (it just does the png_memcpy for you) if it will make the code
+ * easier.  Thus, you can just do this for all cases:
  */
 
    png_progressive_combine_row(png_ptr, old_row, new_row);
@@ -504,8 +531,8 @@ row_callback(png_structp png_ptr, png_bytep new_row,
  * that the first pass (pass == 0 really) will completely cover
  * the old row, so the rows do not have to be initialized.  After
  * the first pass (and only for interlaced images), you will have
- * to pass the current row, and the function will combine the
- * old row and the new row.
+ * to pass the current row as new_row, and the function will combine
+ * the old row and the new row.
  */
 }
 
@@ -533,7 +560,7 @@ void write_png(char *file_name /* , ... other image information ... */)
    /* open the file */
    fp = fopen(file_name, "wb");
    if (fp == NULL)
-      return;
+      return (ERROR);
 
    /* Create and initialize the png_struct with the desired error handler
     * functions.  If you want to use the default stderr and longjump method,
@@ -547,7 +574,7 @@ void write_png(char *file_name /* , ... other image information ... */)
    if (png_ptr == NULL)
    {
       fclose(fp);
-      return;
+      return (ERROR);
    }
 
    /* Allocate/initialize the image information data.  REQUIRED */
@@ -555,8 +582,8 @@ void write_png(char *file_name /* , ... other image information ... */)
    if (info_ptr == NULL)
    {
       fclose(fp);
-      png_destroy_write_struct(&png_ptr,  (png_infopp)NULL);
-      return;
+      png_destroy_write_struct(&png_ptr,  png_infopp_NULL);
+      return (ERROR);
    }
 
    /* Set error handling.  REQUIRED if you aren't supplying your own
@@ -566,8 +593,8 @@ void write_png(char *file_name /* , ... other image information ... */)
    {
       /* If we get here, we had a problem reading the file */
       fclose(fp);
-      png_destroy_write_struct(&png_ptr,  (png_infopp)info_ptr);
-      return;
+      png_destroy_write_struct(&png_ptr, &info_ptr);
+      return (ERROR);
    }
 
    /* One of the following I/O initialization functions is REQUIRED */
@@ -587,7 +614,7 @@ void write_png(char *file_name /* , ... other image information ... */)
     * image info living info in the structure.  You could "|" many
     * PNG_TRANSFORM flags into the png_transforms integer here.
     */
-   png_write_png(png_ptr, info_ptr, png_transforms, NULL);
+   png_write_png(png_ptr, info_ptr, png_transforms, png_voidp_NULL);
 #else
    /* This is the hard way */
 
@@ -603,9 +630,10 @@ void write_png(char *file_name /* , ... other image information ... */)
       PNG_INTERLACE_????, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
 
    /* set the palette if there is one.  REQUIRED for indexed-color images */
-   palette = (png_colorp)png_malloc(png_ptr, 256 * sizeof (png_color));
+   palette = (png_colorp)png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH
+             * sizeof (png_color));
    /* ... set palette colors ... */
-   png_set_PLTE(png_ptr, info_ptr, palette, 256);
+   png_set_PLTE(png_ptr, info_ptr, palette, PNG_MAX_PALETTE_LENGTH);
    /* You must not free palette here, because png_set_PLTE only makes a link to
       the palette that you malloced.  Wait until you are about to destroy
       the png structure. */
@@ -672,7 +700,7 @@ void write_png(char *file_name /* , ... other image information ... */)
     * all optional.  Only call them if you want them.
     */
 
-   /* invert monocrome pixels */
+   /* invert monochrome pixels */
    png_set_invert_mono(png_ptr);
 
    /* Shift the pixels up to a legal bit depth and fill in
@@ -755,20 +783,22 @@ void write_png(char *file_name /* , ... other image information ... */)
       allocated it with malloc() instead of png_malloc(), use free() instead
       of png_free(). */
    png_free(png_ptr, palette);
+   palette=NULL;
 
    /* Similarly, if you png_malloced any data that you passed in with
       png_set_something(), such as a hist or trans array, free it here,
       when you can be sure that libpng is through with it. */
    png_free(png_ptr, trans);
+   trans=NULL;
 
    /* clean up after the write, and free any memory allocated */
-   png_destroy_write_struct(&png_ptr, (png_infopp)info_ptr);
+   png_destroy_write_struct(&png_ptr, &info_ptr);
 
    /* close the file */
    fclose(fp);
 
    /* that's it */
-   return;
+   return (OK);
 }
 
 #endif /* if 0 */

libpng.txt

@@ -1,9 +1,9 @@
 libpng.txt - A description on how to use and modify libpng
 
- libpng version 1.0.7beta13 - May 16, 2000
+ libpng version 1.2.1beta3 - October 27, 2001
  Updated and distributed by Glenn Randers-Pehrson
  <randeg@alum.rpi.edu>
- Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
+ Copyright (c) 1998-2001 Glenn Randers-Pehrson
  For conditions of distribution and use, see copyright
  notice in png.h.
 
@@ -37,8 +37,7 @@ 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.
 
-The PNG-1.2 specification is available at <http://www.cdrom.com/pub/png>
-(will be moving to <http://www.libpng.org>)
+The PNG-1.2 specification is available at <http://www.libpng.org/pub/png>
 and at <ftp://ftp.uu.net/graphics/png/documents/>.
 
 The PNG-1.0 specification is available
@@ -49,8 +48,7 @@ documents at <ftp://ftp.uu.net/graphics/png/documents/>.
 
 Other information
 about PNG, and the latest version of libpng, can be found at the PNG home
-page, <http://www.cdrom.com/pub/png/> (will be moving to
-<http://www.libpng.org>)
+page, <http://www.libpng.org/pub/png/>
 and at <ftp://ftp.uu.net/graphics/png/>.
 
 Most users will not have to modify the library significantly; advanced
@@ -69,7 +67,7 @@ majority of the needs of its users.
 
 Libpng uses zlib for its compression and decompression of PNG files.
 Further information about zlib, and the latest version of zlib, can
-be found at the zlib home page, <ftp://ftp.freesoftware.com/pub/infozip/zlib/>.
+be found at the zlib home page, <http://www.info-zip.org/pub/infozip/zlib/>.
 The zlib compression utility is a general purpose utility that is
 useful for more than PNG files, and can be used without libpng.
 See the documentation delivered with zlib for more details.
@@ -80,7 +78,9 @@ 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.
+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.
 
 
 II. Structures
@@ -148,13 +148,13 @@ Customizing libpng.
     FILE *fp = fopen(file_name, "rb");
     if (!fp)
     {
-        return;
+        return (ERROR);
     }
     fread(header, 1, number, fp);
     is_png = !png_sig_cmp(header, 0, number);
     if (!is_png)
     {
-        return;
+        return (NOT_PNG);
     }
 
 
@@ -166,19 +166,21 @@ pointers to error handling functions, and a pointer to a data struct for
 use by the error functions, if necessary (the pointer and functions can
 be NULL if the default error handlers are to be used).  See the section
 on Changes to Libpng below regarding the old initialization functions.
+The structure allocation functions quietly return NULL if they fail to
+create the structure, so your application should check for that.
 
     png_structp png_ptr = png_create_read_struct
        (PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
         user_error_fn, user_warning_fn);
     if (!png_ptr)
-        return;
+        return (ERROR);
 
     png_infop info_ptr = png_create_info_struct(png_ptr);
     if (!info_ptr)
     {
         png_destroy_read_struct(&png_ptr,
            (png_infopp)NULL, (png_infopp)NULL);
-        return;
+        return (ERROR);
     }
 
     png_infop end_info = png_create_info_struct(png_ptr);
@@ -186,7 +188,7 @@ on Changes to Libpng below regarding the old initialization functions.
     {
         png_destroy_read_struct(&png_ptr, &info_ptr,
           (png_infopp)NULL);
-        return;
+        return (ERROR);
     }
 
 If you want to use your own memory allocation routines,
@@ -221,7 +223,7 @@ free any memory.
         png_destroy_read_struct(&png_ptr, &info_ptr,
            &end_info);
         fclose(fp);
-        return;
+        return (ERROR);
     }
 
 If you would rather avoid the complexity of setjmp/longjmp issues,
@@ -257,10 +259,11 @@ input stream. You must supply the function
            png_byte name[5];
            png_byte *data;
            png_size_t size;
-       /* Note that libpng has already taken care of the
-          CRC handling */
+       /* Note that libpng has already taken care of
+          the CRC handling */
 
-       /* put your code here.  Return one of the following: */
+       /* put your code here.  Return one of the
+          following: */
 
        return (-n); /* chunk had an error */
        return (0); /* did not recognize */
@@ -285,7 +288,8 @@ 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.
 You must supply a function
 
-    void read_row_callback(png_ptr ptr, png_uint_32 row, int pass);
+    void read_row_callback(png_ptr ptr, png_uint_32 row,
+       int pass);
     {
       /* put your code here */
     }
@@ -331,16 +335,23 @@ the entire image into memory, and (b) the input transformations
 you want to do are limited to the following set:
 
     PNG_TRANSFORM_IDENTITY      No transformation
-    PNG_TRANSFORM_STRIP_16      Strip 16-bit samples to 8 bits
+    PNG_TRANSFORM_STRIP_16      Strip 16-bit samples to
+                                8 bits
     PNG_TRANSFORM_STRIP_ALPHA   Discard the alpha channel
-    PNG_TRANSFORM_PACKING       Expand 1, 2 and 4-bit samples to bytes
-    PNG_TRANSFORM_PACKSWAP      Change order of packed pixels to LSB first
+    PNG_TRANSFORM_PACKING       Expand 1, 2 and 4-bit
+                                samples to bytes
+    PNG_TRANSFORM_PACKSWAP      Change order of packed
+                                pixels to LSB first
     PNG_TRANSFORM_EXPAND        Perform set_expand()
     PNG_TRANSFORM_INVERT_MONO   Invert monochrome images
-    PNG_TRANSFORM_SHIFT         Normalize pixels to the sBIT depth
-    PNG_TRANSFORM_BGR           Flip RGB to BGR, RGBA to BGRA
-    PNG_TRANSFORM_SWAP_ALPHA    Flip RGBA to ARGB or GA to AG
-    PNG_TRANSFORM_INVERT_ALPHA  Change alpha from opacity to transparency
+    PNG_TRANSFORM_SHIFT         Normalize pixels to the
+                                sBIT depth
+    PNG_TRANSFORM_BGR           Flip RGB to BGR, RGBA
+                                to BGRA
+    PNG_TRANSFORM_SWAP_ALPHA    Flip RGBA to ARGB or GA
+                                to AG
+    PNG_TRANSFORM_INVERT_ALPHA  Change alpha from opacity
+                                to transparency
     PNG_TRANSFORM_SWAP_ENDIAN   Byte-swap 16-bit samples
 
 (This excludes setting a background color, doing gamma transformation,
@@ -368,10 +379,12 @@ where row_pointers is an array of pointers to the pixel data for each row:
 If you know your image size and pixel size ahead of time, you can allocate
 row_pointers prior to calling png_read_png() with
 
-   row_pointers = png_malloc(png_ptr, height*sizeof(png_bytep));
+   row_pointers = png_malloc(png_ptr,
+      height*sizeof(png_bytep));
    for (int i=0; i<height, i++)
-      row_pointers[i]=png_malloc(png_ptr, width*pixel_size);
-   png_set_rows(png_ptr, info_ptr, &row_pointers); 
+      row_pointers[i]=png_malloc(png_ptr,
+         width*pixel_size);
+   png_set_rows(png_ptr, info_ptr, &row_pointers);
 
 Alternatively you could allocate your image in one big block and define
 row_pointers[i] to point into the proper places in your block.
@@ -400,7 +413,7 @@ in until png_read_end() has read the chunk data following the image.
 
     png_get_IHDR(png_ptr, info_ptr, &width, &height,
        &bit_depth, &color_type, &interlace_type,
-       &compression_type, &filter_type);
+       &compression_type, &filter_method);
 
     width          - holds the width of the image
                      in pixels (up to 2^31).
@@ -428,15 +441,18 @@ in until png_read_end() has read the chunk data following the image.
                      PNG_COLOR_MASK_COLOR
                      PNG_COLOR_MASK_ALPHA
 
-    filter_type    - (must be PNG_FILTER_TYPE_BASE
-                     for PNG 1.0)
+    filter_method  - (must be PNG_FILTER_TYPE_BASE
+                     for PNG 1.0, and can also be
+                     PNG_INTRAPIXEL_DIFFERENCING if
+                     the PNG datastream is embedded in
+                     a MNG-1.0 datastream)
     compression_type - (must be PNG_COMPRESSION_TYPE_BASE
                      for PNG 1.0)
     interlace_type - (PNG_INTERLACE_NONE or
                      PNG_INTERLACE_ADAM7)
     Any or all of interlace_type, compression_type, of
-                     filter_type can be NULL if you are not
-                     interested in their values.
+    filter_method can be NULL if you are
+    not interested in their values.
 
     channels = png_get_channels(png_ptr, info_ptr);
     channels       - number of channels of info for the
@@ -466,7 +482,7 @@ in until png_read_end() has read the chunk data following the image.
                          info_ptr);
     color_type       = png_get_color_type(png_ptr,
                          info_ptr);
-    filter_type      = png_get_filter_type(png_ptr,
+    filter_method    = png_get_filter_type(png_ptr,
                          info_ptr);
     compression_type = png_get_compression_type(png_ptr,
                          info_ptr);
@@ -499,14 +515,15 @@ into the info_ptr is returned for any complex types.
                      implies specific values of gAMA and
                      cHRM.
 
-    png_get_iCCP(png_ptr, info_ptr, &name, &compression_type,
-                      &profile, &proflen);
+    png_get_iCCP(png_ptr, info_ptr, &name,
+       &compression_type, &profile, &proflen);
     name            - The profile name.
-    compression     - The compression type; always PNG_COMPRESSION_TYPE_BASE
-                      for PNG 1.0.  You may give NULL to this argument
-                      to ignore it.
-    profile         - International Color Consortium color profile
-                      data. May contain NULs.
+    compression     - The compression type; always
+                      PNG_COMPRESSION_TYPE_BASE for PNG 1.0.
+                      You may give NULL to this argument to
+                      ignore it.
+    profile         - International Color Consortium color
+                      profile data. May contain NULs.
     proflen         - length of profile data in bytes.
 
     png_get_sBIT(png_ptr, info_ptr, &sig_bit);
@@ -520,8 +537,9 @@ into the info_ptr is returned for any complex types.
                      &trans_values);
     trans          - array of transparent entries for
                      palette (PNG_INFO_tRNS)
-    trans_values   - transparent pixel for non-paletted
-                     images (PNG_INFO_tRNS)
+    trans_values   - graylevel or color sample values of
+                     the single transparent color for
+                     non-paletted images (PNG_INFO_tRNS)
     num_trans      - number of transparent entries
                      (PNG_INFO_tRNS)
 
@@ -561,21 +579,24 @@ into the info_ptr is returned for any complex types.
                          string for unknown).
     text_ptr[i].translated_keyword  - keyword in UTF-8
                          (empty string for unknown).
-    num_text       - number of comments (same as num_comments;
-                     you can put NULL here to avoid the duplication)
-    Note while png_set_text() will accept text, language, and 
-    translated keywords that can be NULL pointers, the structure
-    returned by png_get_text will always contain regular
-    zero-terminated C strings.  They might be empty strings but
-    they will never be NULL pointers.
+    num_text       - number of comments (same as
+                     num_comments; you can put NULL here
+                     to avoid the duplication)
+    Note while png_set_text() will accept text, language,
+    and translated keywords that can be NULL pointers, the
+    structure returned by png_get_text will always contain
+    regular zero-terminated C strings.  They might be
+    empty strings but they will never be NULL pointers.
 
-    num_spalettes = png_get_sPLT(png_ptr, info_ptr, &palette_ptr);
+    num_spalettes = png_get_sPLT(png_ptr, info_ptr,
+       &palette_ptr);
     palette_ptr    - array of palette structures holding
-                     contents of one or more sPLT chunks read.
+                     contents of one or more sPLT chunks
+                     read.
     num_spalettes  - number of sPLT chunks read.
 
     png_get_oFFs(png_ptr, info_ptr, &offset_x, &offset_y,
-                     &unit_type);
+       &unit_type);
     offset_x       - positive offset from the left edge
                      of the screen
     offset_y       - positive offset from the top edge
@@ -583,7 +604,7 @@ into the info_ptr is returned for any complex types.
     unit_type      - PNG_OFFSET_PIXEL, PNG_OFFSET_MICROMETER
 
     png_get_pHYs(png_ptr, info_ptr, &res_x, &res_y,
-                     &unit_type);
+       &unit_type);
     res_x          - pixels/unit physical resolution in
                      x direction
     res_y          - pixels/unit physical resolution in
@@ -591,47 +612,50 @@ into the info_ptr is returned for any complex types.
     unit_type      - PNG_RESOLUTION_UNKNOWN,
                      PNG_RESOLUTION_METER
 
-    png_get_sCAL(png_ptr, info_ptr, &unit, &width, &height)
+    png_get_sCAL(png_ptr, info_ptr, &unit, &width,
+       &height)
     unit        - physical scale units (an integer)
     width       - width of a pixel in physical scale units
     height      - height of a pixel in physical scale units
                  (width and height are doubles)
 
-    png_get_sCAL_s(png_ptr, info_ptr, &unit, &width, &height)
+    png_get_sCAL_s(png_ptr, info_ptr, &unit, &width,
+       &height)
     unit        - physical scale units (an integer)
     width       - width of a pixel in physical scale units
     height      - height of a pixel in physical scale units
                  (width and height are strings like "2.54")
 
-    num_unknown_chunks = png_get_unknown_chunks(png_ptr, info_ptr,
-                            &unknowns)
-    unknowns          - array of png_unknown_chunk structures holding
-                        unknown chunks
+    num_unknown_chunks = png_get_unknown_chunks(png_ptr,
+       info_ptr, &unknowns)
+    unknowns          - array of png_unknown_chunk
+                        structures holding unknown chunks
     unknowns[i].name  - name of unknown chunk
     unknowns[i].data  - data of unknown chunk
     unknowns[i].size  - size of unknown chunk's data
     unknowns[i].location - position of chunk in file
 
-    The value of "i" corresponds to the order in which the chunks were read
-    from the PNG file or inserted with the png_set_unknown_chunks() function.
+    The value of "i" corresponds to the order in which the
+    chunks were read from the PNG file or inserted with the
+    png_set_unknown_chunks() function.
 
 The data from the pHYs chunk can be retrieved in several convenient
 forms:
 
     res_x = png_get_x_pixels_per_meter(png_ptr,
-                  info_ptr)
+       info_ptr)
     res_y = png_get_y_pixels_per_meter(png_ptr,
-                  info_ptr)
+       info_ptr)
     res_x_and_y = png_get_pixels_per_meter(png_ptr,
-                  info_ptr)
+       info_ptr)
     res_x = png_get_x_pixels_per_inch(png_ptr,
-                  info_ptr)
+       info_ptr)
     res_y = png_get_y_pixels_per_inch(png_ptr,
-                  info_ptr)
+       info_ptr)
     res_x_and_y = png_get_pixels_per_inch(png_ptr,
-                  info_ptr)
+       info_ptr)
     aspect_ratio = png_get_pixel_aspect_ratio(png_ptr,
-                  info_ptr)
+       info_ptr)
 
    (Each of these returns 0 [signifying "unknown"] if
        the data is not present or if res_x is 0;
@@ -646,8 +670,8 @@ forms:
     y_offset = png_get_y_offset_inches(png_ptr, info_ptr);
 
    (Each of these returns 0 [signifying "unknown" if both
-       x and y are 0] if the data is not present or if the chunk
-       is present but the unit is the pixel)
+       x and y are 0] if the data is not present or if the
+       chunk is present but the unit is the pixel)
 
 For more information, see the png_info definition in png.h and the
 PNG specification for chunk contents.  Be careful with trusting
@@ -768,7 +792,7 @@ higher possible bit depth (e.g. from 5 bits/sample in the range [0,31] to
 convert the PNG pixel data back to the original bit depth of the image.
 This call reduces the pixels back down to the original bit depth:
 
-    png_color_16p sig_bit;
+    png_color_8p sig_bit;
 
     if (png_get_sBIT(png_ptr, info_ptr, &sig_bit))
         png_set_shift(png_ptr, sig_bit);
@@ -780,17 +804,18 @@ changes the storage of the pixels to blue, green, red:
         color_type == PNG_COLOR_TYPE_RGB_ALPHA)
         png_set_bgr(png_ptr);
 
-PNG files store RGB pixels packed into 3 bytes. This code expands them
-into 4 bytes for windowing systems that need them in this format:
+PNG files store RGB pixels packed into 3 or 6 bytes. This code expands them
+into 4 or 8 bytes for windowing systems that need them in this format:
 
-    if (bit_depth == 8 && color_type ==
-        PNG_COLOR_TYPE_RGB) png_set_filler(png_ptr,
-        filler, PNG_FILLER_BEFORE);
+    if (color_type == PNG_COLOR_TYPE_RGB)
+        png_set_filler(png_ptr, filler, PNG_FILLER_BEFORE);
 
 where "filler" is the 8 or 16-bit number to fill with, and the location is
 either PNG_FILLER_BEFORE or PNG_FILLER_AFTER, depending upon whether
 you want the filler before the RGB or after.  This transformation
-does not affect images that already have full alpha channels.
+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.
 
 If you are reading an image with an alpha channel, and you need the
 data as ARGB instead of the normal PNG format RGBA:
@@ -958,7 +983,7 @@ histogram, it may not do as good a job.
       if (png_get_valid(png_ptr, info_ptr,
          PNG_INFO_PLTE))
       {
-         png_color_16p histogram;
+         png_uint_16p histogram;
 
          png_get_hIST(png_ptr, info_ptr,
             &histogram);
@@ -980,7 +1005,13 @@ PNG files describe monochrome as black being zero and white being one.
 The following code will reverse this (make black be one and white be
 zero):
 
-   if (bit_depth == 1 && color_type == PNG_COLOR_GRAY)
+   if (bit_depth == 1 && color_type == PNG_COLOR_TYPE_GRAY)
+      png_set_invert_mono(png_ptr);
+
+This function can also be used to invert grayscale and gray-alpha images:
+
+   if (color_type == PNG_COLOR_TYPE_GRAY ||
+        color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
       png_set_invert_mono(png_ptr);
 
 PNG files store 16 bit pixels in network byte order (big-endian,
@@ -1179,9 +1210,9 @@ When you are done, you can free all memory allocated by libpng like this:
        &end_info);
 
 It is also possible to individually free the info_ptr members that
-point to libpng-allocated storage with the following functions:
+point to libpng-allocated storage with the following function:
 
-    png_free_data(png_ptr, info_ptr, mask, n)
+    png_free_data(png_ptr, info_ptr, mask, seq)
     mask - identifies data to be freed, a mask
            containing the logical OR of one or
            more of
@@ -1191,16 +1222,17 @@ point to libpng-allocated storage with the following functions:
              PNG_FREE_SCAL, PNG_FREE_SPLT,
              PNG_FREE_TEXT, PNG_FREE_UNKN,
            or simply PNG_FREE_ALL
-    n    - sequence number of item to be freed
+    seq  - sequence number of item to be freed
            (-1 for all items)
 
-These functions may be safely called when the relevant storage has
+This function may be safely called when the relevant storage has
 already been freed, or has not yet been allocated, or was allocated
 by the user and not by libpng,  and will in those
-cases do nothing.  The "n" parameter is ignored if only one item
-of the selected data type, such as PLTE, is allowed.  If "n" is not
+cases do nothing.  The "seq" parameter is ignored if only one item
+of the selected data type, such as PLTE, is allowed.  If "seq" is not
 -1, and multiple items are allowed for the data type identified in
-the mask, such as text or sPLT, only the n'th item is freed.
+the mask, such as text or sPLT, only the n'th item in the structure
+is freed, where n is "seq".
 
 The default behavior is only to free data that was allocated internally
 by libpng.  This can be changed, so that libpng will not free the data,
@@ -1224,8 +1256,7 @@ or png_destroy_*() is supposed to free the data.  When the user assumes
 responsibility for libpng-allocated data, the application must use
 png_free() to free it, and when the user transfers responsibility to libpng
 for data that the user has allocated, the user must have used png_malloc()
-or png_zalloc() to allocate it (the png_zalloc() function is the same
-as png_malloc() except that it also zeroes the newly-allocated memory).
+or png_zalloc() to allocate it.
 
 If you allocated your row_pointers in a single block, as suggested above in
 the description of the high level read interface, you must not transfer
@@ -1239,6 +1270,23 @@ the key member, and png_free_data() will free only text_ptr.key.  Similarly,
 if you transfer responsibility for free'ing text_ptr from libpng to your
 application, your application must not separately free those members.
 
+The png_free_data() function will turn off the "valid" flag for anything
+it frees.  If you need to turn the flag off for a chunk that was freed by your
+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
+           more of
+             PNG_INFO_gAMA, PNG_INFO_sBIT,
+             PNG_INFO_cHRM, PNG_INFO_PLTE,
+             PNG_INFO_tRNS, PNG_INFO_bKGD,
+             PNG_INFO_hIST, PNG_INFO_pHYs,
+             PNG_INFO_oFFs, PNG_INFO_tIME,
+             PNG_INFO_pCAL, PNG_INFO_sRGB,
+             PNG_INFO_iCCP, PNG_INFO_sPLT,
+             PNG_INFO_sCAL, PNG_INFO_IDAT
+
 For a more compact example of reading a PNG image, see the file example.c.
 
 Reading PNG files progressively
@@ -1267,20 +1315,20 @@ png_infop info_ptr;
         (PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
          user_error_fn, user_warning_fn);
     if (!png_ptr)
-        return -1;
+        return (ERROR);
     info_ptr = png_create_info_struct(png_ptr);
     if (!info_ptr)
     {
         png_destroy_read_struct(&png_ptr, (png_infopp)NULL,
            (png_infopp)NULL);
-        return -1;
+        return (ERROR);
     }
 
     if (setjmp(png_jmpbuf(png_ptr)))
     {
         png_destroy_read_struct(&png_ptr, &info_ptr,
            (png_infopp)NULL);
-        return -1;
+        return (ERROR);
     }
 
     /* This one's new.  You can provide functions
@@ -1314,7 +1362,7 @@ png_infop info_ptr;
     {
         png_destroy_read_struct(&png_ptr, &info_ptr,
            (png_infopp)NULL);
-        return -1;
+        return (ERROR);
     }
 
     /* This one's new also.  Simply give it a chunk
@@ -1428,7 +1476,7 @@ custom writing functions.  See the discussion under Customizing libpng.
     FILE *fp = fopen(file_name, "wb");
     if (!fp)
     {
-       return;
+       return (ERROR);
     }
 
 Next, png_struct and png_info need to be allocated and initialized.
@@ -1443,14 +1491,14 @@ both "png_ptr"; you can call them anything you like, such as
        (PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
         user_error_fn, user_warning_fn);
     if (!png_ptr)
-       return;
+       return (ERROR);
 
     png_infop info_ptr = png_create_info_struct(png_ptr);
     if (!info_ptr)
     {
        png_destroy_write_struct(&png_ptr,
          (png_infopp)NULL);
-       return;
+       return (ERROR);
     }
 
 If you want to use your own memory allocation routines,
@@ -1475,9 +1523,9 @@ section below for more information on the libpng error handling.
 
     if (setjmp(png_jmpbuf(png_ptr)))
     {
-        png_destroy_write_struct(&png_ptr, &info_ptr);
-        fclose(fp);
-        return;
+       png_destroy_write_struct(&png_ptr, &info_ptr);
+       fclose(fp);
+       return (ERROR);
     }
     ...
     return;
@@ -1502,7 +1550,8 @@ called after each row has been written, which you can use to control
 a progress meter or the like.  It's demonstrated in pngtest.c.
 You must supply a function
 
-    void write_row_callback(png_ptr, png_uint_32 row, int pass);
+    void write_row_callback(png_ptr, png_uint_32 row,
+       int pass);
     {
       /* put your code here */
     }
@@ -1521,16 +1570,18 @@ maximum possible compression at the expense of slower writing.  If you
 have no special needs in this area, let the library do what it wants by
 not calling this function at all, as it has been tuned to deliver a good
 speed/compression ratio. The second parameter to png_set_filter() is
-the filter method, for which the only valid value is '0' (as of the
-July 1999 PNG specification, version 1.2).  The third parameter is a
-flag that indicates which filter type(s) are to be tested for each
-scanline.  See the PNG specification for details on the specific filter
+the filter method, for which the only valid values are 0 (as of the
+July 1999 PNG specification, version 1.2) or 64 (if you are writing
+a PNG datastream that is to be embedded in a MNG datastream).  The third
+parameter is a flag that indicates which filter type(s) are to be tested
+for each scanline.  See the PNG specification for details on the specific filter
 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 or more PNG_FILTER_NAME masks. */
+       specific filters.  You can use either a single
+       PNG_FILTER_VALUE_NAME or the logical OR of one
+       or more PNG_FILTER_NAME masks. */
     png_set_filter(png_ptr, 0,
        PNG_FILTER_NONE  | PNG_FILTER_VALUE_NONE |
        PNG_FILTER_SUB   | PNG_FILTER_VALUE_SUB  |
@@ -1545,6 +1596,9 @@ it should start out with all of the filters (to ensure that the previous
 row of pixels will be stored in case it's needed later), and then add
 and remove them after the start of compression.
 
+If you are writing a PNG datastream that is to be embedded in a MNG
+datastream, the second parameter can be either 0 or 64.
+
 The png_set_compression_*() functions interface to the zlib compression
 library, and should mostly be ignored unless you really know what you are
 doing.  The only generally useful call is png_set_compression_level()
@@ -1583,7 +1637,7 @@ Some of the more important parts of the png_info are:
 
     png_set_IHDR(png_ptr, info_ptr, width, height,
        bit_depth, color_type, interlace_type,
-       compression_type, filter_type)
+       compression_type, filter_method)
     width          - holds the width of the image
                      in pixels (up to 2^31).
     height         - holds the height of the image
@@ -1615,7 +1669,11 @@ Some of the more important parts of the png_info are:
                      PNG_INTERLACE_ADAM7
     compression_type - (must be
                      PNG_COMPRESSION_TYPE_DEFAULT)
-    filter_type    - (must be PNG_FILTER_TYPE_DEFAULT)
+    filter_method  - (must be PNG_FILTER_TYPE_DEFAULT
+                     or, if you are writing a PNG to
+                     be embedded in a MNG datastream,
+                     can also be
+                     PNG_INTRAPIXEL_DIFFERENCING)
 
     png_set_PLTE(png_ptr, info_ptr, palette,
        num_palette);
@@ -1659,11 +1717,12 @@ Some of the more important parts of the png_info are:
     png_set_iCCP(png_ptr, info_ptr, name, compression_type,
                       profile, proflen);
     name            - The profile name.
-    compression     - The compression type; always PNG_COMPRESSION_TYPE_BASE
-                      for PNG 1.0.  You may give NULL to this argument
-                      to ignore it.
-    profile         - International Color Consortium color profile
-                      data. May contain NULs.
+    compression     - The compression type; always
+                      PNG_COMPRESSION_TYPE_BASE for PNG 1.0.
+                      You may give NULL to this argument to
+                      ignore it.
+    profile         - International Color Consortium color
+                      profile data. May contain NULs.
     proflen         - length of profile data in bytes.
 
     png_set_sBIT(png_ptr, info_ptr, sig_bit);
@@ -1677,8 +1736,9 @@ Some of the more important parts of the png_info are:
        trans_values);
     trans          - array of transparent entries for
                      palette (PNG_INFO_tRNS)
-    trans_values   - transparent pixel for non-paletted
-                     images (PNG_INFO_tRNS)
+    trans_values   - graylevel or color sample values of
+                     the single transparent color for
+                     non-paletted images (PNG_INFO_tRNS)
     num_trans      - number of transparent entries
                      (PNG_INFO_tRNS)
 
@@ -1716,11 +1776,13 @@ Some of the more important parts of the png_info are:
                          or empty for unknown).
     num_text       - number of comments
 
-    png_set_sPLT(png_ptr, info_ptr, &palette_ptr, num_spalettes);
-    palette_ptr    - array of png_sPLT_struct structures to be
-                     added to the list of palettes in the info
-                     structure.
-    num_spalettes  - number of palette structures to be added.
+    png_set_sPLT(png_ptr, info_ptr, &palette_ptr,
+       num_spalettes);
+    palette_ptr    - array of png_sPLT_struct structures
+                     to be added to the list of palettes
+                     in the info structure.
+    num_spalettes  - number of palette structures to be
+                     added.
 
     png_set_oFFs(png_ptr, info_ptr, offset_x, offset_y,
         unit_type);
@@ -1751,9 +1813,10 @@ Some of the more important parts of the png_info are:
     height      - height of a pixel in physical scale units
                  (width and height are strings like "2.54")
 
-    png_set_unknown_chunks(png_ptr, info_ptr, &unknowns, num_unknowns)
-    unknowns          - array of png_unknown_chunk structures holding
-                        unknown chunks
+    png_set_unknown_chunks(png_ptr, info_ptr, &unknowns,
+       num_unknowns)
+    unknowns          - array of png_unknown_chunk
+                        structures holding unknown chunks
     unknowns[i].name  - name of unknown chunk
     unknowns[i].data  - data of unknown chunk
     unknowns[i].size  - size of unknown chunk's data
@@ -1762,14 +1825,15 @@ Some of the more important parts of the png_info are:
                            PNG_HAVE_IHDR: before PLTE
                            PNG_HAVE_PLTE: before IDAT
                            PNG_AFTER_IDAT: after IDAT
-    The "location" member is set automatically according to
-    what part of the output file has already been written.
-    You can change its value after calling png_set_unknown_chunks()
-    as demonstrated in pngtest.c.  Within each of the "locations",
-    the chunks are sequenced according to their position in the
-    structure (that is, the value of "i", which is the order in which
-    the chunk was either read from the input file or defined with
-    png_set_unknown_chunks).
+
+The "location" member is set automatically according to
+what part of the output file has already been written.
+You can change its value after calling png_set_unknown_chunks()
+as demonstrated in pngtest.c.  Within each of the "locations",
+the chunks are sequenced according to their position in the
+structure (that is, the value of "i", which is the order in which
+the chunk was either read from the input file or defined with
+png_set_unknown_chunks).
 
 A quick word about text and num_text.  text is an array of png_text
 structures.  num_text is the number of valid structures in the array.
@@ -1870,12 +1934,17 @@ transformations are permitted, enabled by the following masks.
 
     PNG_TRANSFORM_IDENTITY      No transformation
     PNG_TRANSFORM_PACKING       Pack 1, 2 and 4-bit samples
-    PNG_TRANSFORM_PACKSWAP      Change order of packed pixels to LSB first
+    PNG_TRANSFORM_PACKSWAP      Change order of packed
+                                pixels to LSB first
     PNG_TRANSFORM_INVERT_MONO   Invert monochrome images
-    PNG_TRANSFORM_SHIFT         Normalize pixels to the sBIT depth
-    PNG_TRANSFORM_BGR           Flip RGB to BGR, RGBA to BGRA
-    PNG_TRANSFORM_SWAP_ALPHA    Flip RGBA to ARGB or GA to AG
-    PNG_TRANSFORM_INVERT_ALPHA  Change alpha from opacity to transparency
+    PNG_TRANSFORM_SHIFT         Normalize pixels to the
+                                sBIT depth
+    PNG_TRANSFORM_BGR           Flip RGB to BGR, RGBA
+                                to BGRA
+    PNG_TRANSFORM_SWAP_ALPHA    Flip RGBA to ARGB or GA
+                                to AG
+    PNG_TRANSFORM_INVERT_ALPHA  Change alpha from opacity
+                                to transparency
     PNG_TRANSFORM_SWAP_ENDIAN   Byte-swap 16-bit samples
     PNG_TRANSFORM_STRIP_FILLER  Strip out filler bytes.
 
@@ -2137,9 +2206,9 @@ When you are done, you can free all memory used by libpng like this:
     png_destroy_write_struct(&png_ptr, &info_ptr);
 
 It is also possible to individually free the info_ptr members that
-point to libpng-allocated storage with the following functions:
+point to libpng-allocated storage with the following function:
 
-    png_free_data(png_ptr, info_ptr, mask, n)
+    png_free_data(png_ptr, info_ptr, mask, seq)
     mask  - identifies data to be freed, a mask
             containing the logical OR of one or
             more of
@@ -2149,16 +2218,17 @@ point to libpng-allocated storage with the following functions:
               PNG_FREE_SCAL, PNG_FREE_SPLT,
               PNG_FREE_TEXT, PNG_FREE_UNKN,
             or simply PNG_FREE_ALL
-    n     - sequence number of item to be freed
+    seq   - sequence number of item to be freed
             (-1 for all items)
 
-These functions may be safely called when the relevant storage has
+This function may be safely called when the relevant storage has
 already been freed, or has not yet been allocated, or was allocated
 by the user  and not by libpng,  and will in those
-cases do nothing.  The "n" parameter is ignored if only one item
-of the selected data type, such as PLTE, is allowed.  If "n" is not
+cases do nothing.  The "seq" parameter is ignored if only one item
+of the selected data type, such as PLTE, is allowed.  If "seq" is not
 -1, and multiple items are allowed for the data type identified in
-the mask, such as text or sPLT, only the n'th item is freed.
+the mask, such as text or sPLT, only the n'th item in the structure
+is freed, where n is "seq".
 
 If you allocated data such as a palette that you passed
 in to libpng with png_set_*, you must not free it until just before the call to
@@ -2212,13 +2282,22 @@ For a more compact example of writing a PNG image, see the file example.c.
 
 V. Modifying/Customizing libpng:
 
-There are two issues here.  The first is changing how libpng does
+There are three 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.
+
+Memory allocation, input/output, and error handling
 
 All of the memory allocation, input/output, and error handling in libpng
-goes through callbacks that are user settable.  The default routines are
+goes through callbacks that are user-settable.  The default routines are
 in pngmem.c, pngrio.c, pngwio.c, and pngerror.c, respectively.  To change
 these functions, call the appropriate png_set_*_fn() function.
 
@@ -2230,8 +2309,8 @@ memory allocation on a platform will change between applications, these
 functions must be modified in the library at compile time.  If you prefer
 to use a different method of allocating and freeing data, you can use
 
-    png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr
-      malloc_fn, png_free_ptr free_fn)
+    png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr,
+       png_malloc_ptr malloc_fn, png_free_ptr free_fn)
 
 This function also provides a void pointer that can be retrieved via
 
@@ -2239,9 +2318,14 @@ This function also provides a void pointer that can be retrieved via
 
 Your replacement memory functions must have prototypes as follows:
 
-    png_voidp malloc_fn(png_structp png_ptr, png_uint_32 size);
+    png_voidp malloc_fn(png_structp png_ptr,
+       png_uint_32 size);
     void free_fn(png_structp png_ptr, png_voidp ptr);
 
+Your malloc_fn() can return NULL in case of failure.  The png_malloc()
+function will call png_error() if it receives a NULL from the system
+memory allocator or from your replacement malloc_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
@@ -2451,6 +2535,12 @@ structures appropriately for all of the filter types.
 
     png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE,
        filters);
+              The second parameter can also be
+              PNG_INTRAPIXEL_DIFFERENCING if you are
+              writing a PNG to be embedded in a MNG
+              datastream.  This parameter must be the
+              same as the value of filter_method used
+              in png_set_IHDR().
 
 It is also possible to influence how libpng chooses from among the
 available filters.  This is done in two ways - by telling it how
@@ -2562,7 +2652,152 @@ 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.  Changes to Libpng from version 0.88
+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
+certain extensions to PNG for PNG images that are embedded in MNG datastreams.
+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
+        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_32_uint that is the logical AND of
+      your mask with the set of MNG features that is
+      supported by the version of libpng that you are using.
+
+It is an error to use this function when reading or writing a standalone
+PNG file with the PNG 8-byte signature.  The PNG datastream must be wrapped
+in a MNG datastream.  As a minimum, it must have the MNG 8-byte signature
+and the MHDR and MEND chunks.  Libpng does not provide support for these
+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
 
 It should be noted that versions of libpng later than 0.96 are not
 distributed by the original libpng author, Guy Schalnat, nor by
@@ -2572,7 +2807,7 @@ of the original PNG Group, Glenn Randers-Pehrson.  Guy and Andreas are
 still alive and well, but they have moved on to other things.
 
 The old libpng functions png_read_init(), png_write_init(),
-png_info_init(), png_read_destroy(), and png_write_destory() have been
+png_info_init(), png_read_destroy(), and png_write_destroy() have been
 moved to PNG_INTERNAL in version 0.95 to discourage their use.  These
 functions will be removed from libpng version 2.0.0.
 
@@ -2611,15 +2846,15 @@ application:
 
    png_uint_32 application_vn = PNG_LIBPNG_VER;
 
-VII. Y2K Compliance in libpng
+IX. Y2K Compliance in libpng
 
-May 16, 2000
+October 27, 2001
 
 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 1.0.7beta13 are Y2K compliant.  It is my belief that earlier
+upward through 1.2.1beta3 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
@@ -2637,7 +2872,8 @@ There are seven time-related functions:
 
     png_convert_to_rfc_1123() in png.c
       (formerly png_convert_to_rfc_1152() in error)
-    png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
+    png_convert_from_struct_tm() in pngwrite.c, called
+      in pngwrite.c
     png_convert_from_time_t() in pngwrite.c
     png_get_tIME() in pngget.c
     png_handle_tIME() in pngrutil.c, called in pngread.c

libpngpf.3

@@ -1,6 +1,6 @@
-.TH LIBPNGPF 3 "May 16, 2000"
+.TH LIBPNGPF 3 "October 27, 2001"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.0.7beta13
+libpng \- Portable Network Graphics (PNG) Reference Library 1.2.1beta3
 (private functions)
 .SH SYNOPSIS
 \fB#include <png.h>\fP
@@ -47,11 +47,11 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.7beta13
 
 \fI\fB
 
-\fBpng_voidp png_create_struct (int \fP\fItype\fP\fB, png_malloc_ptr \fImalloc_fn\fP\fB);\fP
+\fBpng_voidp png_create_struct (int \fItype\fP\fB);\fP
 
 \fI\fB
 
-\fBpng_voidp png_create_struct_2 (int \fItype\fP\fB);\fP
+\fBpng_voidp png_create_struct_2 (int \fP\fItype\fP\fB, png_malloc_ptr \fP\fImalloc_fn\fP\fB, png_voidp \fImem_ptr\fP\fB);\fP
 
 \fI\fB
 
@@ -63,7 +63,7 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.7beta13
 
 \fI\fB
 
-\fBvoid png_destroy_struct_2 (png_voidp \fP\fIstruct_ptr\fP\fB, png_free_ptr \fIfree_fn\fP\fB);\fP
+\fBvoid png_destroy_struct_2 (png_voidp \fP\fIstruct_ptr\fP\fB, png_free_ptr \fP\fIfree_fn\fP\fB, png_voidp \fImem_ptr\fP\fB);\fP
 
 \fI\fB
 
@@ -283,6 +283,10 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.7beta13
 
 \fI\fB
 
+\fBvoid png_init_mmx_flags (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
 \fBvoid png_init_read_transformations (png_structp \fIpng_ptr\fP\fB);\fP
 
 \fI\fB
@@ -425,6 +429,8 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.7beta13
 
 \fBvoid png_write_data (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIdata\fP\fB, png_size_t \fIlength\fP\fB);\fP
 
+\fI\fB
+
 \fBvoid png_write_filtered_row (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fIfiltered_row\fP\fB);\fP
 
 \fI\fB
@@ -539,7 +545,8 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.0.7beta13
 
 .SH DESCRIPTION
 The functions listed above are used privately by libpng
-and are not recommended for use by applications.  They
+and are not recommended for use by applications.  They are
+not "exported" to applications using shared libraries.  They
 are listed alphabetically here as an aid to libpng maintainers.
 See png.h for more information on these functions.
 

png.5

@@ -1,4 +1,4 @@
-.TH PNG 5 "May 16, 2000"
+.TH PNG 5 "October 27, 2001"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION
@@ -23,7 +23,7 @@ platforms.
 PNG 1.2 specification, July 1999:
 .IP
 .br
-http://www.cdrom.com/pub/png (moving to http://www.libpng.org)
+http://www.libpng.org/pub/png
 .br
 or ftp://ftp.uu.net/graphics/png/documents
 .LP

png.c

@@ -1,31 +1,30 @@
 
 /* png.c - location for general purpose libpng functions
  *
- * libpng version 1.0.7beta13 - May 16, 2000
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
+ * libpng version 1.2.1beta3 - October 27, 2001
+ * Copyright (c) 1998-2001 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.)
  *
  */
 
 #define PNG_INTERNAL
 #define PNG_NO_EXTERN
-#include <assert.h>
 #include "png.h"
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_0_7beta13 Your_png_h_is_not_version_1_0_7beta13;
+typedef version_1_2_1beta3 Your_png_h_is_not_version_1_2_1beta3;
 
 /* 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 */
-char png_libpng_ver[12] = "1.0.7beta13";
+const char png_libpng_ver[18] = "1.2.1beta3";
 
 /* png_sig was changed to a function in version 1.0.5c */
 /* Place to hold the signature string for a PNG file. */
-png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
+const png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
 
 /* Invoke global declarations for constant strings for known chunk types */
 PNG_IHDR;
@@ -53,32 +52,33 @@ PNG_zTXt;
 /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
 
 /* start of interlace block */
-int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
+const int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
 
 /* offset to next interlace block */
-int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
+const int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
 
 /* start of interlace block in the y direction */
-int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
+const int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
 
 /* offset to next interlace block in the y direction */
-int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
+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
-int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
+const int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
 #endif
 
 /* Height of interlace block.  This is not currently used - if you need
  * it, uncomment it here and in png.h
-int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
+const int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
 */
 
 /* Mask to determine which pixels are valid in a pass */
-int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
+const int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
 
 /* Mask to determine which pixels to overwrite while displaying */
-int FARDATA png_pass_dsp_mask[] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
+const int FARDATA png_pass_dsp_mask[]
+   = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
 
 #endif
 
@@ -135,12 +135,13 @@ png_check_sig(png_bytep sig, int num)
 }
 
 /* Function to allocate memory for zlib and clear it to 0. */
-voidpf PNGAPI
+voidpf /* PRIVATE */
 png_zalloc(voidpf png_ptr, uInt items, uInt size)
 {
    png_uint_32 num_bytes = (png_uint_32)items * size;
    png_voidp ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes);
 
+#ifndef PNG_NO_ZALLOC_ZERO
    if (num_bytes > (png_uint_32)0x8000L)
    {
       png_memset(ptr, 0, (png_size_t)0x8000L);
@@ -151,11 +152,12 @@ png_zalloc(voidpf png_ptr, uInt items, uInt size)
    {
       png_memset(ptr, 0, (png_size_t)num_bytes);
    }
+#endif
    return ((voidpf)ptr);
 }
 
 /* function to free memory for zlib */
-void PNGAPI
+void /* PRIVATE */
 png_zfree(voidpf png_ptr, voidpf ptr)
 {
    png_free((png_structp)png_ptr, (png_voidp)ptr);
@@ -211,12 +213,12 @@ png_create_info_struct(png_structp png_ptr)
    if(png_ptr == NULL) return (NULL);
 #ifdef PNG_USER_MEM_SUPPORTED
    if ((info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO,
-      png_ptr->malloc_fn)) != NULL)
+      png_ptr->malloc_fn, png_ptr->mem_ptr)) != NULL)
 #else
    if ((info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO)) != NULL)
 #endif
    {
-      png_info_init(info_ptr);
+      png_info_init_3(&info_ptr, sizeof(png_info));
    }
 
    return (info_ptr);
@@ -241,11 +243,12 @@ png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr)
       png_info_destroy(png_ptr, info_ptr);
 
 #ifdef PNG_USER_MEM_SUPPORTED
-      png_destroy_struct_2((png_voidp)info_ptr, png_ptr->free_fn);
+      png_destroy_struct_2((png_voidp)info_ptr, png_ptr->free_fn,
+          png_ptr->mem_ptr);
 #else
       png_destroy_struct((png_voidp)info_ptr);
 #endif
-      *info_ptr_ptr = (png_infop)NULL;
+      *info_ptr_ptr = NULL;
    }
 }
 
@@ -253,10 +256,28 @@ 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.
  */
+#undef png_info_init
 void PNGAPI
 png_info_init(png_infop info_ptr)
 {
-   png_debug(1, "in png_info_init\n");
+   /* We only come here via pre-1.0.12-compiled applications */
+   png_info_init_3(&info_ptr, 0);
+}
+
+void PNGAPI
+png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size)
+{
+   png_infop info_ptr = *ptr_ptr;
+
+   png_debug(1, "in png_info_init_3\n");
+
+   if(sizeof(png_info) > png_info_struct_size)
+     {
+       png_destroy_struct(info_ptr);
+       info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
+       *ptr_ptr = info_ptr;
+     }
+
    /* set everything to 0 */
    png_memset(info_ptr, 0, sizeof (png_info));
 }
@@ -280,7 +301,8 @@ png_data_freer(png_structp png_ptr, png_infop info_ptr,
 #endif
 
 void PNGAPI
-png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, int num)
+png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask,
+   int num)
 {
    png_debug(1, "in png_free_data\n");
    if (png_ptr == NULL || info_ptr == NULL)
@@ -289,14 +311,14 @@ png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, int num
 #if defined(PNG_TEXT_SUPPORTED)
 /* free text item num or (if num == -1) all text items */
 #ifdef PNG_FREE_ME_SUPPORTED
-if (mask & info_ptr->free_me & PNG_FREE_TEXT)
+if ((mask & PNG_FREE_TEXT) & info_ptr->free_me)
 #else
 if (mask & PNG_FREE_TEXT)
 #endif
 {
    if (num != -1)
    {
-     if (info_ptr->text[num].key)
+     if (info_ptr->text && info_ptr->text[num].key)
      {
          png_free(png_ptr, info_ptr->text[num].key);
          info_ptr->text[num].key = NULL;
@@ -304,15 +326,12 @@ if (mask & PNG_FREE_TEXT)
    }
    else
    {
-     if (info_ptr->text != NULL)
-     {
        int i;
        for (i = 0; i < info_ptr->num_text; i++)
            png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, i);
        png_free(png_ptr, info_ptr->text);
        info_ptr->text = NULL;
        info_ptr->num_text=0;
-     }
    }
 }
 #endif
@@ -320,94 +339,95 @@ if (mask & PNG_FREE_TEXT)
 #if defined(PNG_tRNS_SUPPORTED)
 /* free any tRNS entry */
 #ifdef PNG_FREE_ME_SUPPORTED
-if (mask & PNG_FREE_TRNS & info_ptr->free_me)
+if ((mask & PNG_FREE_TRNS) & info_ptr->free_me)
 #else
 if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS))
 #endif
 {
-   if (info_ptr->valid & PNG_INFO_tRNS)
-   {
-         png_free(png_ptr, info_ptr->trans);
-       info_ptr->valid &= ~PNG_INFO_tRNS;
-   }
+    png_free(png_ptr, info_ptr->trans);
+    info_ptr->valid &= ~PNG_INFO_tRNS;
+    info_ptr->trans = NULL;
 }
 #endif
 
 #if defined(PNG_sCAL_SUPPORTED)
 /* free any sCAL entry */
 #ifdef PNG_FREE_ME_SUPPORTED
-if (mask & PNG_FREE_SCAL & info_ptr->free_me)
+if ((mask & PNG_FREE_SCAL) & info_ptr->free_me)
 #else
 if (mask & PNG_FREE_SCAL)
 #endif
 {
-   if (info_ptr->valid & PNG_INFO_sCAL)
-   {
 #if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
-       png_free(png_ptr, info_ptr->scal_s_width);
-       png_free(png_ptr, info_ptr->scal_s_height);
+    png_free(png_ptr, info_ptr->scal_s_width);
+    png_free(png_ptr, info_ptr->scal_s_height);
+    info_ptr->scal_s_width = NULL;
+    info_ptr->scal_s_height = NULL;
 #endif
-       info_ptr->valid &= ~PNG_INFO_sCAL;
-   }
+    info_ptr->valid &= ~PNG_INFO_sCAL;
 }
 #endif
 
 #if defined(PNG_pCAL_SUPPORTED)
 /* free any pCAL entry */
 #ifdef PNG_FREE_ME_SUPPORTED
-if (mask & PNG_FREE_PCAL & info_ptr->free_me)
+if ((mask & PNG_FREE_PCAL) & info_ptr->free_me)
 #else
 if (mask & PNG_FREE_PCAL)
 #endif
 {
-   if (info_ptr->valid & PNG_INFO_pCAL)
-   {
-       png_free(png_ptr, info_ptr->pcal_purpose);
-       png_free(png_ptr, info_ptr->pcal_units);
-       if (info_ptr->pcal_params != NULL)
-       {
-           int i;
-           for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
-             {
-             png_free(png_ptr, info_ptr->pcal_params[i]);
-             }
-           png_free(png_ptr, info_ptr->pcal_params);
-           info_ptr->valid &= ~PNG_INFO_pCAL;
-       }
-   }
+    png_free(png_ptr, info_ptr->pcal_purpose);
+    png_free(png_ptr, info_ptr->pcal_units);
+    info_ptr->pcal_purpose = NULL;
+    info_ptr->pcal_units = NULL;
+    if (info_ptr->pcal_params != NULL)
+    {
+        int i;
+        for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
+        {
+          png_free(png_ptr, info_ptr->pcal_params[i]);
+          info_ptr->pcal_params[i]=NULL;
+        }
+        png_free(png_ptr, info_ptr->pcal_params);
+        info_ptr->pcal_params = NULL;
+    }
+    info_ptr->valid &= ~PNG_INFO_pCAL;
 }
 #endif
 
 #if defined(PNG_iCCP_SUPPORTED)
 /* free any iCCP entry */
 #ifdef PNG_FREE_ME_SUPPORTED
-if (mask & PNG_FREE_ICCP & info_ptr->free_me)
+if ((mask & PNG_FREE_ICCP) & info_ptr->free_me)
 #else
 if (mask & PNG_FREE_ICCP)
 #endif
 {
-   if (info_ptr->valid & PNG_INFO_iCCP)
-   {
-       png_free(png_ptr, info_ptr->iccp_name);
-       png_free(png_ptr, info_ptr->iccp_profile);
-       info_ptr->valid &= ~PNG_INFO_iCCP;
-   }
+    png_free(png_ptr, info_ptr->iccp_name);
+    png_free(png_ptr, info_ptr->iccp_profile);
+    info_ptr->iccp_name = NULL;
+    info_ptr->iccp_profile = NULL;
+    info_ptr->valid &= ~PNG_INFO_iCCP;
 }
 #endif
 
 #if defined(PNG_sPLT_SUPPORTED)
 /* free a given sPLT entry, or (if num == -1) all sPLT entries */
 #ifdef PNG_FREE_ME_SUPPORTED
-if (mask & PNG_FREE_SPLT & info_ptr->free_me)
+if ((mask & PNG_FREE_SPLT) & info_ptr->free_me)
 #else
 if (mask & PNG_FREE_SPLT)
 #endif
 {
    if (num != -1)
    {
-       png_free(png_ptr, info_ptr->splt_palettes[num].name);
-       png_free(png_ptr, info_ptr->splt_palettes[num].entries);
-       info_ptr->valid &= ~PNG_INFO_sPLT;
+      if(info_ptr->splt_palettes)
+      {
+          png_free(png_ptr, info_ptr->splt_palettes[num].name);
+          png_free(png_ptr, info_ptr->splt_palettes[num].entries);
+          info_ptr->splt_palettes[num].name = NULL;
+          info_ptr->splt_palettes[num].entries = NULL;
+      }
    }
    else
    {
@@ -418,23 +438,28 @@ if (mask & PNG_FREE_SPLT)
             png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i);
 
          png_free(png_ptr, info_ptr->splt_palettes);
+         info_ptr->splt_palettes = NULL;
          info_ptr->splt_palettes_num = 0;
        }
+       info_ptr->valid &= ~PNG_INFO_sPLT;
    }
 }
 #endif
 
 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
 #ifdef PNG_FREE_ME_SUPPORTED
-if (mask & info_ptr->free_me & PNG_FREE_UNKN)
+if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
 #else
 if (mask & PNG_FREE_UNKN)
 #endif
 {
    if (num != -1)
    {
-       png_free(png_ptr, info_ptr->unknown_chunks[num].data);
-       info_ptr->unknown_chunks[num].data = NULL;
+       if(info_ptr->unknown_chunks)
+       {
+          png_free(png_ptr, info_ptr->unknown_chunks[num].data);
+          info_ptr->unknown_chunks[num].data = NULL;
+       }
    }
    else
    {
@@ -446,6 +471,7 @@ if (mask & PNG_FREE_UNKN)
             png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i);
 
          png_free(png_ptr, info_ptr->unknown_chunks);
+         info_ptr->unknown_chunks = NULL;
          info_ptr->unknown_chunks_num = 0;
        }
    }
@@ -455,38 +481,34 @@ if (mask & PNG_FREE_UNKN)
 #if defined(PNG_hIST_SUPPORTED)
 /* free any hIST entry */
 #ifdef PNG_FREE_ME_SUPPORTED
-if (mask & PNG_FREE_HIST  & info_ptr->free_me)
+if ((mask & PNG_FREE_HIST)  & info_ptr->free_me)
 #else
 if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST))
 #endif
 {
-   if (info_ptr->valid & PNG_INFO_hIST)
-   {
-       png_free(png_ptr, info_ptr->hist);
-       info_ptr->valid &= ~PNG_INFO_hIST;
-   }
+    png_free(png_ptr, info_ptr->hist);
+    info_ptr->hist = NULL;
+    info_ptr->valid &= ~PNG_INFO_hIST;
 }
 #endif
 
 /* free any PLTE entry that was internally allocated */
 #ifdef PNG_FREE_ME_SUPPORTED
-if (mask & PNG_FREE_PLTE & info_ptr->free_me)
+if ((mask & PNG_FREE_PLTE) & info_ptr->free_me)
 #else
 if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE))
 #endif
 {
-   if (info_ptr->valid & PNG_INFO_PLTE)
-   {
-       png_zfree(png_ptr, info_ptr->palette);
-       info_ptr->valid &= ~(PNG_INFO_PLTE);
-       info_ptr->num_palette = 0;
-   }
+    png_zfree(png_ptr, info_ptr->palette);
+    info_ptr->palette = NULL;
+    info_ptr->valid &= ~PNG_INFO_PLTE;
+    info_ptr->num_palette = 0;
 }
 
 #if defined(PNG_INFO_IMAGE_SUPPORTED)
 /* free any image bits attached to the info structure */
 #ifdef PNG_FREE_ME_SUPPORTED
-if (mask & info_ptr->free_me & PNG_FREE_ROWS)
+if ((mask & PNG_FREE_ROWS) & info_ptr->free_me)
 #else
 if (mask & PNG_FREE_ROWS)
 #endif
@@ -495,12 +517,17 @@ if (mask & PNG_FREE_ROWS)
     {
        int row;
        for (row = 0; row < (int)info_ptr->height; row++)
+       {
           png_free(png_ptr, info_ptr->row_pointers[row]);
+          info_ptr->row_pointers[row]=NULL;
+       }
        png_free(png_ptr, info_ptr->row_pointers);
        info_ptr->row_pointers=NULL;
     }
+    info_ptr->valid &= ~PNG_INFO_IDAT;
 }
 #endif
+
 #ifdef PNG_FREE_ME_SUPPORTED
    if(num == -1)
      info_ptr->free_me &= ~mask;
@@ -519,16 +546,17 @@ png_info_destroy(png_structp png_ptr, png_infop info_ptr)
    png_debug(1, "in png_info_destroy\n");
 
    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;
    }
 #endif
 
-   png_info_init(info_ptr);
+   png_info_init_3(&info_ptr, sizeof(png_info));
 }
 
 /* This function returns a pointer to the io_ptr associated with the user
@@ -549,7 +577,7 @@ png_get_io_ptr(png_structp png_ptr)
  * necessarily available.
  */
 void PNGAPI
-png_init_io(png_structp png_ptr, FILE *fp)
+png_init_io(png_structp png_ptr, png_FILE_p fp)
 {
    png_debug(1, "in png_init_io\n");
    png_ptr->io_ptr = (png_voidp)fp;
@@ -573,22 +601,34 @@ png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
          sizeof(char)));
    }
 
+#if defined(_WIN32_WCE)
+   {
+      wchar_t time_buf[29];
+      wsprintf(time_buf, TEXT("%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);
+      WideCharToMultiByte(CP_ACP, 0, time_buf, -1, png_ptr->time_buffer, 29,
+          NULL, NULL);
+   }
+#else
 #ifdef USE_FAR_KEYWORD
    {
       char near_time_buf[29];
       sprintf(near_time_buf, "%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);
+          ptime->day % 32, short_months[(ptime->month - 1) % 12],
+          ptime->year, ptime->hour % 24, ptime->minute % 60,
+          ptime->second % 61);
       png_memcpy(png_ptr->time_buffer, near_time_buf,
-      29*sizeof(char));
+          29*sizeof(char));
    }
 #else
    sprintf(png_ptr->time_buffer, "%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);
+       ptime->day % 32, short_months[(ptime->month - 1) % 12],
+       ptime->year, ptime->hour % 24, ptime->minute % 60,
+       ptime->second % 61);
 #endif
+#endif /* _WIN32_WCE */
    return ((png_charp)png_ptr->time_buffer);
 }
 #endif /* PNG_TIME_RFC1123_SUPPORTED */
@@ -606,11 +646,11 @@ png_charp PNGAPI
 png_get_copyright(png_structp png_ptr)
 {
    if (png_ptr != NULL || png_ptr == NULL)  /* silence compiler warning */
-   return ("\n libpng version 1.0.7beta13 - May 16, 2000\n\
-   Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.\n\
+   return ((png_charp) "\n libpng version 1.2.1beta3 - October 27, 2001\n\
+   Copyright (c) 1998-2001 Glenn Randers-Pehrson\n\
    Copyright (c) 1996, 1997 Andreas Dilger\n\
-   Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson\n");
-   return ("");
+   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
@@ -624,8 +664,8 @@ 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("1.0.7beta13");
-   return("1.0.7beta13");
+      return((png_charp) "1.2.1beta3");
+   return((png_charp) "1.2.1beta3");
 }
 
 png_charp PNGAPI
@@ -633,8 +673,8 @@ 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_LIBPNG_VER_STRING);
-   return(PNG_LIBPNG_VER_STRING);
+      return((png_charp) PNG_LIBPNG_VER_STRING);
+   return((png_charp) PNG_LIBPNG_VER_STRING);
 }
 
 png_charp PNGAPI
@@ -642,12 +682,12 @@ 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_HEADER_VERSION_STRING);
-   return(PNG_HEADER_VERSION_STRING);
+      return((png_charp) PNG_HEADER_VERSION_STRING);
+   return((png_charp) PNG_HEADER_VERSION_STRING);
 }
 
 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-int PNGAPI
+int /* PRIVATE */
 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 */
@@ -670,9 +710,69 @@ png_reset_zstream(png_structp png_ptr)
    return (inflateReset(&png_ptr->zstream));
 }
 
+/* This function was added to libpng-1.0.7 */
 png_uint_32 PNGAPI
 png_access_version_number(void)
 {
    /* Version of *.c files used when building libpng */
-   return((png_uint_32) 10007L);
+   return((png_uint_32) 10201L);
 }
+
+
+#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()) {
+        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)
+{
+    return -1;
+}
+#endif

pngasmrd.h

@@ -1,35 +1,11 @@
 /* pngasmrd.h - assembler version of utilities to read a PNG file
  *
- * libpng 1.0.7beta13 - May 16, 2000
+ * libpng 1.2.1beta3 - October 27, 2001
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1999, 2000 Glenn Randers-Pehrson
+ * Copyright (c) 2001 Glenn Randers-Pehrson
  *
  */
 
-#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
-
-/* Set this in the makefile for VC++ on Pentium, not in pngconf.h */
-/* Platform must be Pentium.  Makefile must assemble and load pngvcrd.c .
- * MMX will be detected at run time and used if present.
+/* This file is obsolete in libpng-1.0.9 and later; its contents now appear
+ * at the end of pngconf.h.
  */
-#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 in pngconf.h */
-/* 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
-/*
-    GRR notes:
-      - see pnggccrd.c for info about what is currently enabled
- */
-
-#endif

pngerror.c

@@ -1,11 +1,11 @@
 
 /* pngerror.c - stub functions for i/o and memory allocation
  *
- * libpng 1.0.7beta13 - May 16, 2000
+ * libpng 1.2.1beta3 - October 27, 2001
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2001 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.)
  *
  * This file provides a location for all error handling.  Users who
  * need special error handling are expected to write replacement functions
@@ -31,6 +31,38 @@ png_default_warning PNGARG((png_structp png_ptr,
 void PNGAPI
 png_error(png_structp png_ptr, png_const_charp message)
 {
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+   char msg[16];
+   if (png_ptr->flags&(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
+   {
+     int offset = 0;
+     if (*message == '#')
+     {
+         for (offset=1; offset<15; offset++)
+            if (*(message+offset) == ' ')
+                break;
+         if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
+         {
+            int i;
+            for (i=0; i<offset-1; i++)
+               msg[i]=message[i+1];
+            msg[i]='\0';
+            message=msg;
+         }
+         else
+            message+=offset;
+     }
+     else
+     {
+         if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
+         {
+            msg[0]='0';        
+            msg[1]='\0';
+            message=msg;
+         }
+     }
+   }
+#endif
    if (png_ptr->error_fn != NULL)
       (*(png_ptr->error_fn))(png_ptr, message);
 
@@ -47,10 +79,22 @@ png_error(png_structp png_ptr, png_const_charp message)
 void PNGAPI
 png_warning(png_structp png_ptr, png_const_charp 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 (*message == '#')
+     {
+         for (offset=1; offset<15; offset++)
+            if (*(message+offset) == ' ')
+                break;
+     }
+   }
    if (png_ptr->warning_fn != NULL)
-      (*(png_ptr->warning_fn))(png_ptr, message);
+      (*(png_ptr->warning_fn))(png_ptr, (png_const_charp)(message+offset));
    else
-      png_default_warning(png_ptr, message);
+      png_default_warning(png_ptr, (png_const_charp)(message+offset));
 }
 
 /* These utilities are used internally to build an error message that relates
@@ -61,11 +105,12 @@ png_warning(png_structp png_ptr, png_const_charp message)
  */
 #define isnonalpha(c) ((c) < 41 || (c) > 122 || ((c) > 90 && (c) < 97))
 static PNG_CONST char png_digit[16] = {
-   '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
-};
+   '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E',
+   'F' };
 
 static void /* PRIVATE */
-png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp message)
+png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp
+   message)
 {
    int iout = 0, iin = 0;
 
@@ -99,7 +144,7 @@ png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp message
 void PNGAPI
 png_chunk_error(png_structp png_ptr, png_const_charp message)
 {
-   char msg[16+64];
+   char msg[18+64];
    png_format_buffer(png_ptr, msg, message);
    png_error(png_ptr, msg);
 }
@@ -107,7 +152,7 @@ png_chunk_error(png_structp png_ptr, png_const_charp message)
 void PNGAPI
 png_chunk_warning(png_structp png_ptr, png_const_charp message)
 {
-   char msg[16+64];
+   char msg[18+64];
    png_format_buffer(png_ptr, msg, message);
    png_warning(png_ptr, msg);
 }
@@ -121,7 +166,31 @@ static void /* PRIVATE */
 png_default_error(png_structp png_ptr, png_const_charp message)
 {
 #ifndef PNG_NO_CONSOLE_IO
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+   if (*message == '#')
+   {
+     int offset;
+     char error_number[16];
+     for (offset=0; offset<15; offset++)
+     {
+         error_number[offset] = *(message+offset+1);
+         if (*(message+offset) == ' ')
+             break;
+     }
+     if((offset > 1) && (offset < 15))
+     {
+       error_number[offset-1]='\0';
+       fprintf(stderr, "libpng error no. %s: %s\n", error_number, message+offset);
+     }
+     else
+       fprintf(stderr, "libpng error: %s, offset=%d\n", message,offset);
+   }
+   else
+#endif
    fprintf(stderr, "libpng error: %s\n", message);
+#else
+   if (message)
+     /* make compiler happy */ ;
 #endif
 
 #ifdef PNG_SETJMP_SUPPORTED
@@ -135,7 +204,7 @@ png_default_error(png_structp png_ptr, png_const_charp message)
    longjmp(png_ptr->jmpbuf, 1);
 # endif
 #else
-   if (png_ptr == NULL)
+   if (png_ptr)
      /* make compiler happy */ ;
    PNG_ABORT();
 #endif
@@ -150,9 +219,34 @@ static void /* PRIVATE */
 png_default_warning(png_structp png_ptr, png_const_charp message)
 {
 #ifndef PNG_NO_CONSOLE_IO
-   fprintf(stderr, "libpng warning: %s\n", message);
+#  ifdef PNG_ERROR_NUMBERS_SUPPORTED
+   if (*message == '#')
+   {
+     int offset;
+     char warning_number[16];
+     for (offset=0; offset<15; offset++)
+     {
+        warning_number[offset]=*(message+offset+1);
+        if (*(message+offset) == ' ')
+            break;
+     }
+     if((offset > 1) && (offset < 15))
+     {
+       warning_number[offset-1]='\0';
+       fprintf(stderr, "libpng warning no. %s: %s\n", warning_number,
+          message+offset);
+     }
+     else
+       fprintf(stderr, "libpng warning: %s\n", message);
+   }
+   else
+#  endif
+     fprintf(stderr, "libpng warning: %s\n", message);
+#else
+   if (message)
+     /* appease compiler */ ;
 #endif
-   if (png_ptr == NULL)
+   if (png_ptr)
       return;
 }
 
@@ -182,4 +276,14 @@ png_get_error_ptr(png_structp png_ptr)
 }
 
 
-
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+void
+png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode)
+{
+   if(png_ptr != NULL)
+   {
+     png_ptr->flags &=
+       ((~(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode);
+   }
+}
+#endif

pngget.c

@@ -1,11 +1,11 @@
 
 /* pngget.c - retrieval of values from info struct
  *
- * libpng 1.0.7beta13 - May 16, 2000
+ * libpng 1.2.1beta3 - October 27, 2001
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2001 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.)
  */
 
 #define PNG_INTERNAL
@@ -115,15 +115,17 @@ png_get_compression_type(png_structp png_ptr, png_infop info_ptr)
 png_uint_32 PNGAPI
 png_get_x_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
 {
+   if (png_ptr != NULL && info_ptr != NULL)
 #if defined(PNG_pHYs_SUPPORTED)
-   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
+   if (info_ptr->valid & PNG_INFO_pHYs)
    {
       png_debug1(1, "in %s retrieval function\n", "png_get_x_pixels_per_meter");
       if(info_ptr->phys_unit_type != PNG_RESOLUTION_METER)
           return (0);
       else return (info_ptr->x_pixels_per_unit);
    }
-   else
+#else
+   return (0);
 #endif
    return (0);
 }
@@ -131,15 +133,17 @@ png_get_x_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
 png_uint_32 PNGAPI
 png_get_y_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
 {
+   if (png_ptr != NULL && info_ptr != NULL)
 #if defined(PNG_pHYs_SUPPORTED)
-   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
+   if (info_ptr->valid & PNG_INFO_pHYs)
    {
       png_debug1(1, "in %s retrieval function\n", "png_get_y_pixels_per_meter");
       if(info_ptr->phys_unit_type != PNG_RESOLUTION_METER)
           return (0);
       else return (info_ptr->y_pixels_per_unit);
    }
-   else
+#else
+   return (0);
 #endif
    return (0);
 }
@@ -147,8 +151,9 @@ png_get_y_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
 png_uint_32 PNGAPI
 png_get_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
 {
+   if (png_ptr != NULL && info_ptr != NULL)
 #if defined(PNG_pHYs_SUPPORTED)
-   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
+   if (info_ptr->valid & PNG_INFO_pHYs)
    {
       png_debug1(1, "in %s retrieval function\n", "png_get_pixels_per_meter");
       if(info_ptr->phys_unit_type != PNG_RESOLUTION_METER ||
@@ -156,7 +161,8 @@ png_get_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
           return (0);
       else return (info_ptr->x_pixels_per_unit);
    }
-   else
+#else
+   return (0);
 #endif
    return (0);
 }
@@ -165,82 +171,92 @@ png_get_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
 float PNGAPI
 png_get_pixel_aspect_ratio(png_structp png_ptr, png_infop info_ptr)
    {
+   if (png_ptr != NULL && info_ptr != NULL)
 #if defined(PNG_pHYs_SUPPORTED)
-   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
+   if (info_ptr->valid & PNG_INFO_pHYs)
    {
       png_debug1(1, "in %s retrieval function\n", "png_get_aspect_ratio");
       if (info_ptr->x_pixels_per_unit == 0)
          return ((float)0.0);
       else
-         return ((float)info_ptr->y_pixels_per_unit
-            /(float)info_ptr->x_pixels_per_unit);
+         return ((float)((float)info_ptr->y_pixels_per_unit
+            /(float)info_ptr->x_pixels_per_unit));
    }
-   else
+#else
+   return (0.0);
 #endif
-      return ((float)0.0);
+   return ((float)0.0);
 }
 #endif
 
-png_uint_32 PNGAPI
+png_int_32 PNGAPI
 png_get_x_offset_microns(png_structp png_ptr, png_infop info_ptr)
 {
+   if (png_ptr != NULL && info_ptr != NULL)
 #if defined(PNG_oFFs_SUPPORTED)
-   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
+   if (info_ptr->valid & PNG_INFO_oFFs)
    {
       png_debug1(1, "in %s retrieval function\n", "png_get_x_offset_microns");
       if(info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
           return (0);
       else return (info_ptr->x_offset);
    }
-   else
+#else
+   return (0);
 #endif
    return (0);
 }
 
-png_uint_32 PNGAPI
+png_int_32 PNGAPI
 png_get_y_offset_microns(png_structp png_ptr, png_infop info_ptr)
 {
+   if (png_ptr != NULL && info_ptr != NULL)
 #if defined(PNG_oFFs_SUPPORTED)
-   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
+   if (info_ptr->valid & PNG_INFO_oFFs)
    {
       png_debug1(1, "in %s retrieval function\n", "png_get_y_offset_microns");
       if(info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
           return (0);
       else return (info_ptr->y_offset);
    }
-   else
+#else
+   return (0);
 #endif
    return (0);
 }
 
-png_uint_32 PNGAPI
+png_int_32 PNGAPI
 png_get_x_offset_pixels(png_structp png_ptr, png_infop info_ptr)
 {
+   if (png_ptr != NULL && info_ptr != NULL)
 #if defined(PNG_oFFs_SUPPORTED)
-   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
+   if (info_ptr->valid & PNG_INFO_oFFs)
    {
       png_debug1(1, "in %s retrieval function\n", "png_get_x_offset_microns");
       if(info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
           return (0);
       else return (info_ptr->x_offset);
    }
-   else
+#else
+   return (0);
 #endif
    return (0);
 }
 
-png_uint_32 PNGAPI
+png_int_32 PNGAPI
 png_get_y_offset_pixels(png_structp png_ptr, png_infop info_ptr)
 {
+   if (png_ptr != NULL && info_ptr != NULL)
 #if defined(PNG_oFFs_SUPPORTED)
-   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
+   if (info_ptr->valid & PNG_INFO_oFFs)
    {
       png_debug1(1, "in %s retrieval function\n", "png_get_y_offset_microns");
       if(info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
           return (0);
       else return (info_ptr->y_offset);
    }
-   else
+#else
+   return (0);
 #endif
    return (0);
 }
@@ -250,21 +266,21 @@ png_uint_32 PNGAPI
 png_get_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
 {
    return ((png_uint_32)((float)png_get_pixels_per_meter(png_ptr, info_ptr)
-     *.0254 +.5);
+     *.0254 +.5));
 }
 
 png_uint_32 PNGAPI
 png_get_x_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
 {
    return ((png_uint_32)((float)png_get_x_pixels_per_meter(png_ptr, info_ptr)
-     *.0254 +.5);
+     *.0254 +.5));
 }
 
 png_uint_32 PNGAPI
 png_get_y_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
 {
    return ((png_uint_32)((float)png_get_y_pixels_per_meter(png_ptr, info_ptr)
-     *.0254 +.5);
+     *.0254 +.5));
 }
 
 float PNGAPI
@@ -278,10 +294,10 @@ float PNGAPI
 png_get_y_offset_inches(png_structp png_ptr, png_infop info_ptr)
 {
    return ((float)png_get_y_offset_microns(png_ptr, info_ptr)
-     *.00003937)
+     *.00003937);
 }
 
-#if defined(PNG_READ_pHYs_SUPPORTED)
+#if defined(PNG_pHYs_SUPPORTED)
 png_uint_32 PNGAPI
 png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr,
    png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
@@ -305,7 +321,7 @@ png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr,
       {
          *unit_type = (int)info_ptr->phys_unit_type;
          retval |= PNG_INFO_pHYs;
-         if(unit_type == 1)
+         if(*unit_type == 1)
          {
             if (res_x != NULL) *res_x = (png_uint_32)(*res_x * .0254 + .50);
             if (res_y != NULL) *res_y = (png_uint_32)(*res_y * .0254 + .50);
@@ -314,7 +330,7 @@ png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr,
    }
    return (retval);
 }
-#endif /* PNG_READ_pHYs_SUPPORTED */
+#endif /* PNG_pHYs_SUPPORTED */
 #endif  /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
 
 /* png_get_channels really belongs in here, too, but it's been around longer */
@@ -339,7 +355,7 @@ png_get_signature(png_structp png_ptr, png_infop info_ptr)
       return (NULL);
 }
 
-#if defined(PNG_READ_bKGD_SUPPORTED)
+#if defined(PNG_bKGD_SUPPORTED)
 png_uint_32 PNGAPI
 png_get_bKGD(png_structp png_ptr, png_infop info_ptr,
    png_color_16p *background)
@@ -355,7 +371,7 @@ png_get_bKGD(png_structp png_ptr, png_infop info_ptr,
 }
 #endif
 
-#if defined(PNG_READ_cHRM_SUPPORTED)
+#if defined(PNG_cHRM_SUPPORTED)
 #ifdef PNG_FLOATING_POINT_SUPPORTED
 png_uint_32 PNGAPI
 png_get_cHRM(png_structp png_ptr, png_infop info_ptr,
@@ -419,7 +435,7 @@ png_get_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
 #endif
 #endif
 
-#if defined(PNG_READ_gAMA_SUPPORTED)
+#if defined(PNG_gAMA_SUPPORTED)
 #ifdef PNG_FLOATING_POINT_SUPPORTED
 png_uint_32 PNGAPI
 png_get_gAMA(png_structp png_ptr, png_infop info_ptr, double *file_gamma)
@@ -451,7 +467,7 @@ png_get_gAMA_fixed(png_structp png_ptr, png_infop info_ptr,
 #endif
 #endif
 
-#if defined(PNG_READ_sRGB_SUPPORTED)
+#if defined(PNG_sRGB_SUPPORTED)
 png_uint_32 PNGAPI
 png_get_sRGB(png_structp png_ptr, png_infop info_ptr, int *file_srgb_intent)
 {
@@ -466,7 +482,7 @@ png_get_sRGB(png_structp png_ptr, png_infop info_ptr, int *file_srgb_intent)
 }
 #endif
 
-#if defined(PNG_READ_iCCP_SUPPORTED)
+#if defined(PNG_iCCP_SUPPORTED)
 png_uint_32 PNGAPI
 png_get_iCCP(png_structp png_ptr, png_infop info_ptr,
              png_charpp name, int *compression_type,
@@ -488,7 +504,7 @@ png_get_iCCP(png_structp png_ptr, png_infop info_ptr,
 }
 #endif
 
-#if defined(PNG_READ_sPLT_SUPPORTED)
+#if defined(PNG_sPLT_SUPPORTED)
 png_uint_32 PNGAPI
 png_get_sPLT(png_structp png_ptr, png_infop info_ptr,
              png_sPLT_tpp spalettes)
@@ -499,7 +515,7 @@ png_get_sPLT(png_structp png_ptr, png_infop info_ptr,
 }
 #endif
 
-#if defined(PNG_READ_hIST_SUPPORTED)
+#if defined(PNG_hIST_SUPPORTED)
 png_uint_32 PNGAPI
 png_get_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p *hist)
 {
@@ -560,7 +576,7 @@ png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
    return (0);
 }
 
-#if defined(PNG_READ_oFFs_SUPPORTED)
+#if defined(PNG_oFFs_SUPPORTED)
 png_uint_32 PNGAPI
 png_get_oFFs(png_structp png_ptr, png_infop info_ptr,
    png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type)
@@ -578,7 +594,7 @@ png_get_oFFs(png_structp png_ptr, png_infop info_ptr,
 }
 #endif
 
-#if defined(PNG_READ_pCAL_SUPPORTED)
+#if defined(PNG_pCAL_SUPPORTED)
 png_uint_32 PNGAPI
 png_get_pCAL(png_structp png_ptr, png_infop info_ptr,
    png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams,
@@ -602,7 +618,7 @@ png_get_pCAL(png_structp png_ptr, png_infop info_ptr,
 }
 #endif
 
-#if defined(PNG_READ_sCAL_SUPPORTED) || defined(PNG_WRITE_sCAL_SUPPORTED)
+#if defined(PNG_sCAL_SUPPORTED)
 #ifdef PNG_FLOATING_POINT_SUPPORTED
 png_uint_32 PNGAPI
 png_get_sCAL(png_structp png_ptr, png_infop info_ptr,
@@ -638,7 +654,7 @@ png_get_sCAL_s(png_structp png_ptr, png_infop info_ptr,
 #endif
 #endif
 
-#if defined(PNG_READ_pHYs_SUPPORTED)
+#if defined(PNG_pHYs_SUPPORTED)
 png_uint_32 PNGAPI
 png_get_pHYs(png_structp png_ptr, png_infop info_ptr,
    png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
@@ -685,7 +701,7 @@ png_get_PLTE(png_structp png_ptr, png_infop info_ptr, png_colorp *palette,
    return (0);
 }
 
-#if defined(PNG_READ_sBIT_SUPPORTED)
+#if defined(PNG_sBIT_SUPPORTED)
 png_uint_32 PNGAPI
 png_get_sBIT(png_structp png_ptr, png_infop info_ptr, png_color_8p *sig_bit)
 {
@@ -700,7 +716,7 @@ png_get_sBIT(png_structp png_ptr, png_infop info_ptr, png_color_8p *sig_bit)
 }
 #endif
 
-#if defined(PNG_READ_TEXT_SUPPORTED)
+#if defined(PNG_TEXT_SUPPORTED)
 png_uint_32 PNGAPI
 png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr,
    int *num_text)
@@ -722,7 +738,7 @@ png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr,
 }
 #endif
 
-#if defined(PNG_READ_tIME_SUPPORTED)
+#if defined(PNG_tIME_SUPPORTED)
 png_uint_32 PNGAPI
 png_get_tIME(png_structp png_ptr, png_infop info_ptr, png_timep *mod_time)
 {
@@ -737,7 +753,7 @@ png_get_tIME(png_structp png_ptr, png_infop info_ptr, png_timep *mod_time)
 }
 #endif
 
-#if defined(PNG_READ_tRNS_SUPPORTED)
+#if defined(PNG_tRNS_SUPPORTED)
 png_uint_32 PNGAPI
 png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
    png_bytep *trans, int *num_trans, png_color_16p *trans_values)
@@ -776,7 +792,7 @@ png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
 }
 #endif
 
-#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
 png_uint_32 PNGAPI
 png_get_unknown_chunks(png_structp png_ptr, png_infop info_ptr,
              png_unknown_chunkpp unknowns)
@@ -791,15 +807,15 @@ png_get_unknown_chunks(png_structp png_ptr, png_infop info_ptr,
 png_byte PNGAPI
 png_get_rgb_to_gray_status (png_structp png_ptr)
 {
-   return png_ptr->rgb_to_gray_status;
+   return (png_byte)(png_ptr? png_ptr->rgb_to_gray_status : 0);
 }
 #endif
 
-#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
+#if defined(PNG_USER_CHUNKS_SUPPORTED)
 png_voidp PNGAPI
 png_get_user_chunk_ptr(png_structp png_ptr)
 {
-   return (png_ptr->user_chunk_ptr);
+   return (png_ptr? png_ptr->user_chunk_ptr : NULL);
 }
 #endif
 
@@ -807,5 +823,95 @@ png_get_user_chunk_ptr(png_structp png_ptr)
 png_uint_32 PNGAPI
 png_get_compression_buffer_size(png_structp png_ptr)
 {
-   return(png_ptr->zbuf_size);
+   return (png_uint_32)(png_ptr? png_ptr->zbuf_size : 0L);
 }
+
+
+#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
+/* 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);
+}
+
+/* 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 */
+}
+#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 */
+}
+
+/* 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);
+}
+
+/* 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);
+}
+#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */

pngmem.c

@@ -1,11 +1,11 @@
 
 /* pngmem.c - stub functions for memory allocation
  *
- * libpng 1.0.7beta13 - May 16, 2000
+ * libpng 1.2.1beta3 - October 27, 2001
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2001 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.)
  *
  * This file provides a location for all memory allocation.  Users who
  * need special memory handling are expected to supply replacement
@@ -27,12 +27,12 @@ png_voidp /* PRIVATE */
 png_create_struct(int type)
 {
 #ifdef PNG_USER_MEM_SUPPORTED
-   return (png_create_struct_2(type, NULL));
+   return (png_create_struct_2(type, png_malloc_ptr_NULL, png_voidp_NULL));
 }
 
 /* Alternate version of png_create_struct, for use with user-defined malloc. */
 png_voidp /* PRIVATE */
-png_create_struct_2(int type, png_malloc_ptr malloc_fn)
+png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
 {
 #endif /* PNG_USER_MEM_SUPPORTED */
    png_size_t size;
@@ -43,35 +43,36 @@ png_create_struct_2(int type, png_malloc_ptr malloc_fn)
    else if (type == PNG_STRUCT_PNG)
      size = sizeof(png_struct);
    else
-     return ((png_voidp)NULL);
+     return (NULL);
 
 #ifdef PNG_USER_MEM_SUPPORTED
    if(malloc_fn != NULL)
    {
-      if ((struct_ptr = (*(malloc_fn))(NULL, size)) != NULL)
-         png_memset(struct_ptr, 0, size);
-         return (struct_ptr);
+      png_struct dummy_struct;
+      png_structp png_ptr = &dummy_struct;
+      png_ptr->mem_ptr=mem_ptr;
+      struct_ptr = (*(malloc_fn))(png_ptr, size);
    }
+   else
 #endif /* PNG_USER_MEM_SUPPORTED */
-   if ((struct_ptr = (png_voidp)farmalloc(size)) != NULL)
-   {
+      struct_ptr = (png_voidp)farmalloc(size));
+   if (struct_ptr != NULL)
       png_memset(struct_ptr, 0, size);
-   }
    return (struct_ptr);
 }
 
-
 /* Free memory allocated by a png_create_struct() call */
 void /* PRIVATE */
 png_destroy_struct(png_voidp struct_ptr)
 {
 #ifdef PNG_USER_MEM_SUPPORTED
-   png_destroy_struct_2(struct_ptr, (png_free_ptr)NULL);
+   png_destroy_struct_2(struct_ptr, png_free_ptr_NULL, png_voidp_NULL);
 }
 
 /* Free memory allocated by a png_create_struct() call */
 void /* PRIVATE */
-png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn)
+png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
+    png_voidp mem_ptr)
 {
 #endif
    if (struct_ptr != NULL)
@@ -81,6 +82,7 @@ png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn)
       {
          png_struct dummy_struct;
          png_structp png_ptr = &dummy_struct;
+         png_ptr->mem_ptr=mem_ptr;
          (*(free_fn))(png_ptr, struct_ptr);
          return;
       }
@@ -115,11 +117,16 @@ png_malloc(png_structp png_ptr, png_uint_32 size)
    png_voidp ret;
 #endif
    if (png_ptr == NULL || size == 0)
-      return ((png_voidp)NULL);
+      return (NULL);
 
 #ifdef PNG_USER_MEM_SUPPORTED
    if(png_ptr->malloc_fn != NULL)
-       return ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, size));
+   {
+       ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, size));
+       if (ret == NULL)
+          png_error(png_ptr, "Out of memory!");
+       return (ret);
+   }
    else
        return png_malloc_default(png_ptr, size);
 }
@@ -281,14 +288,14 @@ png_voidp /* PRIVATE */
 png_create_struct(int type)
 {
 #ifdef PNG_USER_MEM_SUPPORTED
-   return (png_create_struct_2(type, NULL));
+   return (png_create_struct_2(type, png_malloc_ptr_NULL, png_voidp_NULL));
 }
 
 /* Allocate memory for a png_struct or a png_info.  The malloc and
    memset can be replaced by a single call to calloc() if this is thought
    to improve performance noticably.*/
 png_voidp /* PRIVATE */
-png_create_struct_2(int type, png_malloc_ptr malloc_fn)
+png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
 {
 #endif /* PNG_USER_MEM_SUPPORTED */
    png_size_t size;
@@ -299,12 +306,23 @@ png_create_struct_2(int type, png_malloc_ptr malloc_fn)
    else if (type == PNG_STRUCT_PNG)
       size = sizeof(png_struct);
    else
-      return ((png_voidp)NULL);
+      return (NULL);
 
 #ifdef PNG_USER_MEM_SUPPORTED
    if(malloc_fn != NULL)
    {
-      if ((struct_ptr = (*(malloc_fn))(NULL, size)) != NULL)
+      if (mem_ptr != NULL)
+      {
+         png_struct dummy_struct;
+         png_structp png_ptr = &dummy_struct;
+         png_ptr->mem_ptr=mem_ptr;
+         struct_ptr = (*(malloc_fn))(png_ptr, size);
+      }
+      else
+      {
+         struct_ptr = (*(malloc_fn))(png_structp_NULL, size);
+      }
+      if (struct_ptr != NULL)
          png_memset(struct_ptr, 0, size);
       return (struct_ptr);
    }
@@ -332,12 +350,13 @@ void /* PRIVATE */
 png_destroy_struct(png_voidp struct_ptr)
 {
 #ifdef PNG_USER_MEM_SUPPORTED
-   png_destroy_struct_2(struct_ptr, (png_free_ptr)NULL);
+   png_destroy_struct_2(struct_ptr, png_free_ptr_NULL, png_voidp_NULL);
 }
 
 /* Free memory allocated by a png_create_struct() call */
 void /* PRIVATE */
-png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn)
+png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
+    png_voidp mem_ptr)
 {
 #endif /* PNG_USER_MEM_SUPPORTED */
    if (struct_ptr != NULL)
@@ -347,6 +366,7 @@ png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn)
       {
          png_struct dummy_struct;
          png_structp png_ptr = &dummy_struct;
+         png_ptr->mem_ptr=mem_ptr;
          (*(free_fn))(png_ptr, struct_ptr);
          return;
       }
@@ -373,15 +393,18 @@ png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn)
 png_voidp PNGAPI
 png_malloc(png_structp png_ptr, png_uint_32 size)
 {
-#ifndef PNG_USER_MEM_SUPPORTED
    png_voidp ret;
-#endif
    if (png_ptr == NULL || size == 0)
-      return ((png_voidp)NULL);
+      return (NULL);
 
 #ifdef PNG_USER_MEM_SUPPORTED
    if(png_ptr->malloc_fn != NULL)
-       return ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, size));
+   {
+       ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, size));
+       if (ret == NULL)
+          png_error(png_ptr, "Out of Memory!");
+       return (ret);
+   }
    else
        return (png_malloc_default(png_ptr, size));
 }
@@ -407,9 +430,7 @@ png_malloc_default(png_structp png_ptr, png_uint_32 size)
 #endif
 
    if (ret == NULL)
-   {
       png_error(png_ptr, "Out of Memory");
-   }
 
    return (ret);
 }

pngpread.c

@@ -1,11 +1,11 @@
 
 /* pngpread.c - read a png file in push mode
  *
- * libpng 1.0.7beta13 - May 16, 2000
+ * libpng 1.2.1beta3 - October 27, 2001
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2001 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.)
  */
 
 #define PNG_INTERNAL
@@ -714,23 +714,26 @@ png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,
    for(;;)
    {
       ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
-      if (ret == Z_STREAM_END)
+      if (ret != Z_OK)
       {
-         if (png_ptr->zstream.avail_in)
-            png_error(png_ptr, "Extra compressed data");
-         if (!(png_ptr->zstream.avail_out))
+         if (ret == Z_STREAM_END)
          {
-            png_push_process_row(png_ptr);
-         }
+            if (png_ptr->zstream.avail_in)
+               png_error(png_ptr, "Extra compressed data");
+            if (!(png_ptr->zstream.avail_out))
+            {
+               png_push_process_row(png_ptr);
+            }
 
-         png_ptr->mode |= PNG_AFTER_IDAT;
-         png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
-         break;
+            png_ptr->mode |= PNG_AFTER_IDAT;
+            png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
+            break;
+         }
+         else if (ret == Z_BUF_ERROR)
+            break;
+         else
+            png_error(png_ptr, "Decompression Error");
       }
-      else if (ret == Z_BUF_ERROR)
-         break;
-      else if (ret != Z_OK)
-         png_error(png_ptr, "Decompression Error");
       if (!(png_ptr->zstream.avail_out))
       {
          png_push_process_row(png_ptr);
@@ -769,18 +772,42 @@ png_push_process_row(png_structp png_ptr)
    if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
    {
       if (png_ptr->pass < 6)
+/*       old interface (pre-1.0.9):
          png_do_read_interlace(&(png_ptr->row_info),
             png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
+ */
+         png_do_read_interlace(png_ptr);
 
-      switch (png_ptr->pass)
-      {
+    switch (png_ptr->pass)
+    {
          case 0:
          {
             int i;
             for (i = 0; i < 8 && png_ptr->pass == 0; i++)
             {
                png_push_have_row(png_ptr, png_ptr->row_buf + 1);
-               png_read_push_finish_row(png_ptr);
+               png_read_push_finish_row(png_ptr); /* updates png_ptr->pass */
+            }
+            if (png_ptr->pass == 2) /* pass 1 might be empty */
+            {
+               for (i = 0; i < 4 && png_ptr->pass == 2; i++)
+               {
+                  png_push_have_row(png_ptr, png_bytep_NULL);
+                  png_read_push_finish_row(png_ptr);
+               }
+            }
+	    if (png_ptr->pass == 4 && png_ptr->height <= 4)
+	    {
+	        for (i = 0; i < 2 && png_ptr->pass == 4; i++)
+                {
+                   png_push_have_row(png_ptr, png_bytep_NULL);
+                   png_read_push_finish_row(png_ptr);
+                }
+            }
+            if (png_ptr->pass == 6 && png_ptr->height <= 4)
+            {
+                png_push_have_row(png_ptr, png_bytep_NULL);
+                png_read_push_finish_row(png_ptr);
             }
             break;
          }
@@ -792,11 +819,11 @@ png_push_process_row(png_structp png_ptr)
                png_push_have_row(png_ptr, png_ptr->row_buf + 1);
                png_read_push_finish_row(png_ptr);
             }
-            if (png_ptr->pass == 2)
+            if (png_ptr->pass == 2) /* skip top 4 generated rows */
             {
                for (i = 0; i < 4 && png_ptr->pass == 2; i++)
                {
-                  png_push_have_row(png_ptr, NULL);
+                  png_push_have_row(png_ptr, png_bytep_NULL);
                   png_read_push_finish_row(png_ptr);
                }
             }
@@ -812,9 +839,17 @@ png_push_process_row(png_structp png_ptr)
             }
             for (i = 0; i < 4 && png_ptr->pass == 2; i++)
             {
-               png_push_have_row(png_ptr, NULL);
+               png_push_have_row(png_ptr, png_bytep_NULL);
                png_read_push_finish_row(png_ptr);
             }
+            if (png_ptr->pass == 4) /* pass 3 might be empty */
+            {
+               for (i = 0; i < 2 && png_ptr->pass == 4; i++)
+               {
+                  png_push_have_row(png_ptr, png_bytep_NULL);
+                  png_read_push_finish_row(png_ptr);
+               }
+            }
             break;
          }
          case 3:
@@ -825,11 +860,11 @@ png_push_process_row(png_structp png_ptr)
                png_push_have_row(png_ptr, png_ptr->row_buf + 1);
                png_read_push_finish_row(png_ptr);
             }
-            if (png_ptr->pass == 4)
+            if (png_ptr->pass == 4) /* skip top two generated rows */
             {
                for (i = 0; i < 2 && png_ptr->pass == 4; i++)
                {
-                  png_push_have_row(png_ptr, NULL);
+                  png_push_have_row(png_ptr, png_bytep_NULL);
                   png_read_push_finish_row(png_ptr);
                }
             }
@@ -845,7 +880,12 @@ png_push_process_row(png_structp png_ptr)
             }
             for (i = 0; i < 2 && png_ptr->pass == 4; i++)
             {
-               png_push_have_row(png_ptr, NULL);
+               png_push_have_row(png_ptr, png_bytep_NULL);
+               png_read_push_finish_row(png_ptr);
+            }
+            if (png_ptr->pass == 6) /* pass 5 might be empty */
+            {
+               png_push_have_row(png_ptr, png_bytep_NULL);
                png_read_push_finish_row(png_ptr);
             }
             break;
@@ -858,9 +898,9 @@ png_push_process_row(png_structp png_ptr)
                png_push_have_row(png_ptr, png_ptr->row_buf + 1);
                png_read_push_finish_row(png_ptr);
             }
-            if (png_ptr->pass == 6)
+            if (png_ptr->pass == 6) /* skip top generated row */
             {
-               png_push_have_row(png_ptr, NULL);
+               png_push_have_row(png_ptr, png_bytep_NULL);
                png_read_push_finish_row(png_ptr);
             }
             break;
@@ -871,7 +911,7 @@ png_push_process_row(png_structp png_ptr)
             png_read_push_finish_row(png_ptr);
             if (png_ptr->pass != 6)
                break;
-            png_push_have_row(png_ptr, NULL);
+            png_push_have_row(png_ptr, png_bytep_NULL);
             png_read_push_finish_row(png_ptr);
          }
       }
@@ -891,25 +931,25 @@ 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 png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
+   const int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
 
    /* offset to next interlace block */
-   const int png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
+   const int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
 
    /* start of interlace block in the y direction */
-   const int png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
+   const int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
 
    /* offset to next interlace block in the y direction */
-   const int png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
+   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 png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
+   const int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
    */
 
    /* Height of interlace block.  This is not currently used - if you need
     * it, uncomment it here and in png.h
-   const int png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
+   const int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
    */
 #endif
 
@@ -925,6 +965,11 @@ png_read_push_finish_row(png_structp png_ptr)
       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++;
+
          if (png_ptr->pass >= 7)
             break;
 
@@ -950,7 +995,8 @@ png_read_push_finish_row(png_structp png_ptr)
 
 #if defined(PNG_READ_tEXt_SUPPORTED)
 void /* PRIVATE */
-png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
+   length)
 {
    if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
       {
@@ -962,7 +1008,7 @@ png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length
 #ifdef PNG_MAX_MALLOC_64K
    png_ptr->skip_length = 0;  /* This may not be necessary */
 
-   if (length > (png_uint_32)65535L) /* Can't hold the entire string in memory */
+   if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */
    {
       png_warning(png_ptr, "tEXt chunk too large to fit in memory");
       png_ptr->skip_length = length - (png_uint_32)65535L;
@@ -1026,13 +1072,14 @@ png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)
       text_ptr->compression = PNG_TEXT_COMPRESSION_NONE;
       text_ptr->key = key;
 #ifdef PNG_iTXt_SUPPORTED
-      text_ptr->lang = (char *)NULL;
-      text_ptr->lang_key = (char *)NULL;
+      text_ptr->lang = NULL;
+      text_ptr->lang_key = NULL;
 #endif
       text_ptr->text = text;
 
       png_set_text(png_ptr, info_ptr, text_ptr, 1);
 
+      png_free(png_ptr, key);
       png_free(png_ptr, text_ptr);
    }
 }
@@ -1040,7 +1087,8 @@ png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)
 
 #if defined(PNG_READ_zTXt_SUPPORTED)
 void /* PRIVATE */
-png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
+   length)
 {
    if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
       {
@@ -1152,8 +1200,8 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
             if (text == NULL)
             {
                text = (png_charp)png_malloc(png_ptr,
-                  (png_uint_32)(png_ptr->zbuf_size - png_ptr->zstream.avail_out +
-                     key_size + 1));
+                  (png_uint_32)(png_ptr->zbuf_size - png_ptr->zstream.avail_out
+                     + key_size + 1));
                png_memcpy(text + key_size, png_ptr->zbuf,
                   png_ptr->zbuf_size - png_ptr->zstream.avail_out);
                png_memcpy(text, key, key_size);
@@ -1209,13 +1257,14 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
       text_ptr->compression = PNG_TEXT_COMPRESSION_zTXt;
       text_ptr->key = key;
 #ifdef PNG_iTXt_SUPPORTED
-      text_ptr->lang = (char *)NULL;
-      text_ptr->lang_key = (char *)NULL;
+      text_ptr->lang = NULL;
+      text_ptr->lang_key = NULL;
 #endif
       text_ptr->text = text;
 
       png_set_text(png_ptr, info_ptr, text_ptr, 1);
 
+      png_free(png_ptr, key);
       png_free(png_ptr, text_ptr);
    }
 }
@@ -1223,7 +1272,8 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
 
 #if defined(PNG_READ_iTXt_SUPPORTED)
 void /* PRIVATE */
-png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
+   length)
 {
    if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
       {
@@ -1235,7 +1285,7 @@ png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length
 #ifdef PNG_MAX_MALLOC_64K
    png_ptr->skip_length = 0;  /* This may not be necessary */
 
-   if (length > (png_uint_32)65535L) /* Can't hold the entire string in memory */
+   if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */
    {
       png_warning(png_ptr, "iTXt chunk too large to fit in memory");
       png_ptr->skip_length = length - (png_uint_32)65535L;
@@ -1333,7 +1383,8 @@ png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
  * name or a critical chunk), the chunk is (currently) silently ignored.
  */
 void /* PRIVATE */
-png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32
+   length)
 {
    png_uint_32 skip=0;
    png_check_chunk_name(png_ptr, png_ptr->chunk_name);
@@ -1344,7 +1395,7 @@ png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 len
       if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
            HANDLE_CHUNK_ALWAYS
 #if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
-           && png_ptr->read_user_chunk_fn == (png_user_chunk_ptr)NULL
+           && png_ptr->read_user_chunk_fn == NULL
 #endif
          )
 #endif
@@ -1369,12 +1420,12 @@ png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 len
        }
 #endif
 
-       strcpy((png_charp)chunk.name, (png_charp)png_ptr->chunk_name);
+       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;
 #if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
-       if(png_ptr->read_user_chunk_fn != (png_user_chunk_ptr)NULL)
+       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)
@@ -1424,7 +1475,8 @@ png_progressive_combine_row (png_structp png_ptr,
    png_bytep old_row, png_bytep new_row)
 {
 #ifdef PNG_USE_LOCAL_ARRAYS
-   const int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
+   const int FARDATA png_pass_dsp_mask[7] =
+      {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
 #endif
    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]);
@@ -1447,6 +1499,4 @@ png_get_progressive_ptr(png_structp png_ptr)
 {
    return png_ptr->io_ptr;
 }
-
 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
-

pngread.c

@@ -1,11 +1,11 @@
 
 /* pngread.c - read a PNG file
  *
- * libpng 1.0.7beta13 - May 16, 2000
+ * libpng 1.2.1beta3 - October 27, 2001
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2001 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.)
  *
  * This file contains routines that an application calls directly to
  * read a PNG file or stream.
@@ -22,7 +22,7 @@ png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr,
 
 #ifdef PNG_USER_MEM_SUPPORTED
    return (png_create_read_struct_2(user_png_ver, error_ptr, error_fn,
-      warn_fn, NULL, NULL, NULL));
+      warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL));
 }
 
 /* Alternate create PNG structure for reading, and allocate any memory needed. */
@@ -46,13 +46,15 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
    png_debug(1, "in png_create_read_struct\n");
 #ifdef PNG_USER_MEM_SUPPORTED
    if ((png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
-      (png_malloc_ptr)malloc_fn)) == NULL)
+      (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr)) == NULL)
 #else
    if ((png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG)) == NULL)
 #endif
-   {
-      return (png_structp)NULL;
-   }
+      return (NULL);
+
+#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
+   png_init_mmx_flags(png_ptr);   /* 1.2.0 addition */
+#endif
 
 #ifdef PNG_SETJMP_SUPPORTED
 #ifdef USE_FAR_KEYWORD
@@ -62,8 +64,9 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
 #endif
    {
       png_free(png_ptr, png_ptr->zbuf);
+      png_ptr->zbuf=NULL;
       png_destroy_struct(png_ptr);
-      return (png_structp)NULL;
+      return (NULL);
    }
 #ifdef USE_FAR_KEYWORD
    png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
@@ -91,23 +94,27 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
       * only check the first digit.
       */
      if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
+         (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
          (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
      {
+#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
+        char msg[80];
+        if (user_png_ver)
+        {
+          sprintf(msg, "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_libpng_ver);
+        png_warning(png_ptr, msg);
+#endif
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+        png_ptr->flags=0;
+#endif
         png_error(png_ptr,
            "Incompatible libpng version in application and library");
      }
-
-     /* Libpng 1.0.6 was not binary compatible, due to insertion of the
-        info_ptr->free_me member.  Note to maintainer: this test can be
-        removed from version 2.0.0 and beyond because the previous test
-        would have already rejected it. */
-
-     if (user_png_ver[4] == '6' && user_png_ver[2] == '0' && 
-         user_png_ver[0] == '1' && user_png_ver[5] == '\0')
-     {
-        png_error(png_ptr,
-           "Application must be recompiled; version 1.0.6 was incompatible");
-     }
    }
 
    /* initialize zbuf - compression buffer */
@@ -130,7 +137,7 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
    png_ptr->zstream.next_out = png_ptr->zbuf;
    png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
 
-   png_set_read_fn(png_ptr, NULL, NULL);
+   png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL);
 
    return (png_ptr);
 }
@@ -143,18 +150,64 @@ void PNGAPI
 png_read_init(png_structp png_ptr)
 {
    /* We only come here via pre-1.0.7-compiled applications */
-   png_read_init_2(png_ptr, "1.0.0", 10000, 10000);
+   png_read_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
 }
 
+#undef png_read_init_2
 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 !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
+   if(sizeof(png_struct) > png_struct_size || 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",
+           user_png_ver);
+        png_warning(png_ptr, msg);
+      }
+      sprintf(msg, "Application  is running with png.c from libpng-%.20s",
+         png_libpng_ver);
+      png_warning(png_ptr, msg);
+   }
+#endif
+   if(sizeof(png_struct) > png_struct_size)
+     {
+       png_ptr->error_fn=NULL;
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+       png_ptr->flags=0;
+#endif
+       png_error(png_ptr,
+       "The png struct allocated by the application for reading is too small.");
+     }
+   if(sizeof(png_info) > png_info_size)
+     {
+       png_ptr->error_fn=NULL;
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+       png_ptr->flags=0;
+#endif
+       png_error(png_ptr,
+         "The info struct allocated by application for reading is too small.");
+     }
+   png_read_init_3(&png_ptr, user_png_ver, png_struct_size);
+}
+
+void PNGAPI
+png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
+   png_size_t png_struct_size)
 {
 #ifdef PNG_SETJMP_SUPPORTED
    jmp_buf tmp_jmp;  /* to save current jump buffer */
 #endif
 
    int i=0;
+
+   png_structp png_ptr=*ptr_ptr;
+
    do
    {
      if(user_png_ver[i] != png_libpng_ver[i])
@@ -162,28 +215,28 @@ png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver,
 #ifdef PNG_LEGACY_SUPPORTED
        png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
 #else
-       png_ptr->error_fn=(png_error_ptr)NULL;
-       png_error(png_ptr,
-        "Application uses deprecated png_read_init() and must be recompiled.");
+       png_ptr->warning_fn=NULL;
+       png_warning(png_ptr,
+        "Application uses deprecated png_read_init() and should be recompiled.");
+       break;
 #endif
      }
    } while (png_libpng_ver[i++]);
 
-   if(sizeof(png_struct) > png_struct_size ||
-      sizeof(png_info) > png_info_size)
-     {
-       png_ptr->error_fn=(png_error_ptr)NULL;
-       png_error(png_ptr,
-      "Application and library have different sized structs. Please recompile.");
-     }
-
-   png_debug(1, "in png_read_init_2\n");
+   png_debug(1, "in png_read_init_3\n");
 
 #ifdef PNG_SETJMP_SUPPORTED
    /* save jump buffer and error functions */
    png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf));
 #endif
 
+   if(sizeof(png_struct) > png_struct_size)
+     {
+       png_destroy_struct(png_ptr);
+       *ptr_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
+       png_ptr = *ptr_ptr;
+     }
+
    /* reset all variables to 0 */
    png_memset(png_ptr, 0, sizeof (png_struct));
 
@@ -212,7 +265,7 @@ png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver,
    png_ptr->zstream.next_out = png_ptr->zbuf;
    png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
 
-   png_set_read_fn(png_ptr, NULL, NULL);
+   png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL);
 }
 
 /* Read the information before the actual image data.  This has been
@@ -245,6 +298,8 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
          else
             png_error(png_ptr, "PNG file corrupted by ASCII conversion");
       }
+      if (num_checked < 3)
+         png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
    }
 
    for(;;)
@@ -315,7 +370,7 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
       png_reset_crc(png_ptr);
       png_crc_read(png_ptr, png_ptr->chunk_name, 4);
 
-      png_debug2(0, "Reading %s chunk, length=%d.\n", png_ptr->chunk_name,
+      png_debug2(0, "Reading %s chunk, length=%lu.\n", png_ptr->chunk_name,
          length);
 
       /* This should be a binary subdivision search or a hash for
@@ -439,6 +494,9 @@ png_read_update_info(png_structp png_ptr, png_infop info_ptr)
    /* save jump buffer and error functions */
    if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
       png_read_start_row(png_ptr);
+   else
+      png_warning(png_ptr,
+      "Ignoring extra png_read_update_info() call; row buffer not reallocated");
    png_read_transform_info(png_ptr, info_ptr);
 }
 
@@ -465,7 +523,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
    const int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
 #endif
    int ret;
-   png_debug2(1, "in png_read_row (row %d, pass %d)\n",
+   png_debug2(1, "in png_read_row (row %lu, pass %d)\n",
       png_ptr->row_number, png_ptr->pass);
    /* save jump buffer and error functions */
    if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
@@ -642,6 +700,15 @@ 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))
+   {
+      /* Intrapixel differencing */
+      png_do_read_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
+   }
+#endif
 
    if (png_ptr->transformations)
       png_do_read_transformations(png_ptr);
@@ -652,8 +719,11 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
       (png_ptr->transformations & PNG_INTERLACE))
    {
       if (png_ptr->pass < 6)
+/*       old interface (pre-1.0.9):
          png_do_read_interlace(&(png_ptr->row_info),
             png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
+ */
+         png_do_read_interlace(png_ptr);
 
       if (dsp_row != NULL)
          png_combine_row(png_ptr, dsp_row,
@@ -697,7 +767,7 @@ 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 1.0.7beta13
+ * [*] png_handle_alpha() does not exist yet, as of libpng version 1.2.1beta3
  */
 
 void PNGAPI
@@ -724,14 +794,14 @@ png_read_rows(png_structp png_ptr, png_bytepp row,
       for (i = 0; i < num_rows; i++)
       {
          png_bytep rptr = *rp;
-         png_read_row(png_ptr, rptr, NULL);
+         png_read_row(png_ptr, rptr, png_bytep_NULL);
          rp++;
       }
    else if(dp != NULL)
       for (i = 0; i < num_rows; i++)
       {
          png_bytep dptr = *dp;
-         png_read_row(png_ptr, NULL, dptr);
+         png_read_row(png_ptr, png_bytep_NULL, dptr);
          dp++;
       }
 }
@@ -746,7 +816,7 @@ 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 1.0.7beta13
+ * [*] png_handle_alpha() does not exist yet, as of libpng version 1.2.1beta3
  */
 void PNGAPI
 png_read_image(png_structp png_ptr, png_bytepp image)
@@ -776,7 +846,7 @@ png_read_image(png_structp png_ptr, png_bytepp image)
       rp = image;
       for (i = 0; i < image_height; i++)
       {
-         png_read_row(png_ptr, *rp, NULL);
+         png_read_row(png_ptr, *rp, png_bytep_NULL);
          rp++;
       }
    }
@@ -976,6 +1046,7 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
    png_infop info_ptr = NULL, end_info_ptr = NULL;
 #ifdef PNG_USER_MEM_SUPPORTED
    png_free_ptr free_fn = NULL;
+   png_voidp mem_ptr = NULL;
 #endif
 
    png_debug(1, "in png_destroy_read_struct\n");
@@ -991,6 +1062,7 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp 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);
@@ -1002,11 +1074,12 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
 #endif
 
 #ifdef PNG_USER_MEM_SUPPORTED
-      png_destroy_struct_2((png_voidp)info_ptr, free_fn);
+      png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
+          (png_voidp)mem_ptr);
 #else
       png_destroy_struct((png_voidp)info_ptr);
 #endif
-      *info_ptr_ptr = (png_infop)NULL;
+      *info_ptr_ptr = NULL;
    }
 
    if (end_info_ptr != NULL)
@@ -1015,26 +1088,28 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
       png_free_data(png_ptr, end_info_ptr, PNG_FREE_TEXT, -1);
 #endif
 #ifdef PNG_USER_MEM_SUPPORTED
-      png_destroy_struct_2((png_voidp)end_info_ptr, free_fn);
+      png_destroy_struct_2((png_voidp)end_info_ptr, (png_free_ptr)free_fn,
+         (png_voidp)mem_ptr);
 #else
       png_destroy_struct((png_voidp)end_info_ptr);
 #endif
-      *end_info_ptr_ptr = (png_infop)NULL;
+      *end_info_ptr_ptr = NULL;
    }
 
    if (png_ptr != NULL)
    {
 #ifdef PNG_USER_MEM_SUPPORTED
-      png_destroy_struct_2((png_voidp)png_ptr, free_fn);
+      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);
 #endif
-      *png_ptr_ptr = (png_structp)NULL;
+      *png_ptr_ptr = NULL;
    }
 }
 
 /* free all memory used by the read (old method) */
-void PNGAPI
+void /* PRIVATE */
 png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr)
 {
 #ifdef PNG_SETJMP_SUPPORTED
@@ -1056,7 +1131,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
       png_info_destroy(png_ptr, end_info_ptr);
 
    png_free(png_ptr, png_ptr->zbuf);
-   png_free(png_ptr, png_ptr->row_buf);
+   png_free(png_ptr, png_ptr->big_row_buf);
    png_free(png_ptr, png_ptr->prev_row);
 #if defined(PNG_READ_DITHER_SUPPORTED)
    png_free(png_ptr, png_ptr->palette_lookup);
@@ -1287,7 +1362,7 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
 
    /* Optional call to gamma correct and add the background to the palette
     * and update info structure.  REQUIRED if you are expecting libpng to
-    * update the palette for you (ie you selected such a transform above).
+    * update the palette for you (i.e., you selected such a transform above).
     */
    png_read_update_info(png_ptr, info_ptr);
 
@@ -1299,13 +1374,15 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
    if(info_ptr->row_pointers == NULL)
    {
       info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr,
-                                         info_ptr->height * sizeof(png_bytep));
+         info_ptr->height * sizeof(png_bytep));
 #ifdef PNG_FREE_ME_SUPPORTED
       info_ptr->free_me |= PNG_FREE_ROWS;
 #endif
       for (row = 0; row < (int)info_ptr->height; row++)
-         info_ptr->row_pointers[row] = png_malloc(png_ptr,
+      {
+         info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr,
             png_get_rowbytes(png_ptr, info_ptr));
+      }
    }
 
    png_read_image(png_ptr, info_ptr->row_pointers);
@@ -1314,7 +1391,7 @@ 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 == (voidp)NULL)
+   if(transforms == 0 || params == NULL)
       /* quiet compiler warnings */ return;
 
 }

pngrio.c

@@ -1,11 +1,11 @@
 
 /* pngrio.c - functions for data input
  *
- * libpng 1.0.7beta13 - May 16, 2000
+ * libpng 1.2.1beta3 - October 27, 2001
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2001 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.)
  *
  * This file provides a location for all input.  Users who need
  * special handling are expected to write a function that has the same
@@ -26,7 +26,7 @@
 void /* PRIVATE */
 png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
-   png_debug1(4,"reading %d bytes\n", length);
+   png_debug1(4,"reading %d bytes\n", (int)length);
    if (png_ptr->read_data_fn != NULL)
       (*(png_ptr->read_data_fn))(png_ptr, data, length);
    else
@@ -47,13 +47,16 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
    /* 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.
     */
+#if defined(_WIN32_WCE)
+   if ( !ReadFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) )
+      check = 0;
+#else
    check = (png_size_t)fread(data, (png_size_t)1, length,
-      (FILE *)png_ptr->io_ptr);
+      (png_FILE_p)png_ptr->io_ptr);
+#endif
 
    if (check != length)
-   {
       png_error(png_ptr, "Read Error");
-   }
 }
 #else
 /* this is the model-independent version. Since the standard I/O library
@@ -69,14 +72,19 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    int check;
    png_byte *n_data;
-   FILE *io_ptr;
+   png_FILE_p io_ptr;
 
    /* Check if data really is near. If so, use usual code. */
    n_data = (png_byte *)CVT_PTR_NOCHECK(data);
-   io_ptr = (FILE *)CVT_PTR(png_ptr->io_ptr);
+   io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
    if ((png_bytep)n_data == data)
    {
+#if defined(_WIN32_WCE)
+      if ( !ReadFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) )
+         check = 0;
+#else
       check = fread(n_data, 1, length, io_ptr);
+#endif
    }
    else
    {
@@ -87,7 +95,12 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
       do
       {
          read = MIN(NEAR_BUF_SIZE, remaining);
+#if defined(_WIN32_WCE)
+         if ( !ReadFile((HANDLE)(io_ptr), buf, read, &err, NULL) )
+            err = 0;
+#else
          err = fread(buf, (png_size_t)1, read, io_ptr);
+#endif
          png_memcpy(data, buf, read); /* copy far buffer to near buffer */
          if(err != read)
             break;
@@ -99,9 +112,7 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
       while (remaining != 0);
    }
    if ((png_uint_32)check != (png_uint_32)length)
-   {
       png_error(png_ptr, "read Error");
-   }
 }
 #endif
 #endif
@@ -148,4 +159,3 @@ png_set_read_fn(png_structp png_ptr, png_voidp io_ptr,
    png_ptr->output_flush_fn = NULL;
 #endif
 }
-

pngrtran.c

@@ -1,11 +1,11 @@
 
 /* pngrtran.c - transforms the data in a row for PNG readers
  *
- * libpng 1.0.7beta13 - May 16, 2000
+ * libpng 1.2.1beta3 - October 27, 2001
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2001 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.)
  *
  * This file contains functions optionally called by an application
  * in order to tell libpng how to handle data when reading a PNG.
@@ -742,7 +742,7 @@ png_init_read_transformations(png_structp png_ptr)
    }
 #endif
 
-#if defined(PNG_READ_BACKGROUND_SUPPORTED)
+#if defined(PNG_READ_BACKGROUND_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED)
    png_ptr->background_1 = png_ptr->background;
 #endif
 #if defined(PNG_READ_GAMMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
@@ -901,7 +901,7 @@ png_init_read_transformations(png_structp png_ptr)
       }
       else
       /* transformation does not include PNG_BACKGROUND */
-#endif
+#endif /* PNG_READ_BACKGROUND_SUPPORTED */
       if (color_type == PNG_COLOR_TYPE_PALETTE)
       {
          png_colorp palette = png_ptr->palette;
@@ -919,7 +919,7 @@ png_init_read_transformations(png_structp png_ptr)
 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
    else
 #endif
-#endif
+#endif /* PNG_READ_GAMMA_SUPPORTED && PNG_FLOATING_POINT_SUPPORTED */
 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
    /* No GAMMA transformation */
    if ((png_ptr->transformations & PNG_BACKGROUND) &&
@@ -952,7 +952,7 @@ png_init_read_transformations(png_structp png_ptr)
          }
       }
    }
-#endif
+#endif /* PNG_READ_BACKGROUND_SUPPORTED */
 
 #if defined(PNG_READ_SHIFT_SUPPORTED)
    if ((png_ptr->transformations & PNG_SHIFT) &&
@@ -977,8 +977,13 @@ png_init_read_transformations(png_structp png_ptr)
          png_ptr->palette[i].blue >>= sb;
       }
    }
-#endif
+#endif  /* PNG_READ_SHIFT_SUPPORTED */
  }
+#if !defined(PNG_READ_GAMMA_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED) \
+ && !defined(PNG_READ_BACKGROUND_SUPPORTED)
+   if(png_ptr)
+      return;
+#endif
 }
 
 /* Modify the info structure to reflect the transformations.  The
@@ -1085,7 +1090,12 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
    if ((png_ptr->transformations & PNG_FILLER) &&
        ((info_ptr->color_type == PNG_COLOR_TYPE_RGB) ||
        (info_ptr->color_type == PNG_COLOR_TYPE_GRAY)))
+   {
       info_ptr->channels++;
+#if 0 /* if adding a true alpha channel not just filler */
+      info_ptr->color_type |= PNG_COLOR_MASK_ALPHA;
+#endif
+   }
 #endif
 
 #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) && \
@@ -1103,6 +1113,10 @@ defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
       info_ptr->bit_depth);
    info_ptr->rowbytes = ((info_ptr->width * info_ptr->pixel_depth + 7) >> 3);
 
+#if !defined(PNG_READ_EXPAND_SUPPORTED)
+   if(png_ptr)
+      return;
+#endif
 }
 
 /* Transform the row.  The order of transformations is significant,
@@ -1116,7 +1130,7 @@ png_do_read_transformations(png_structp png_ptr)
 #if !defined(PNG_USELESS_TESTS_SUPPORTED)
    if (png_ptr->row_buf == NULL)
    {
-#if !defined(PNG_NO_STDIO)
+#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,
@@ -1213,12 +1227,15 @@ From Andreas Dilger e-mail to png-implement, 26 March 1998:
       ((png_ptr->num_trans != 0 ) ||
       (png_ptr->color_type & PNG_COLOR_MASK_ALPHA)))
       png_do_background(&(png_ptr->row_info), png_ptr->row_buf + 1,
-         &(png_ptr->trans_values), &(png_ptr->background),
-         &(png_ptr->background_1),
+         &(png_ptr->trans_values), &(png_ptr->background)
+#if defined(PNG_READ_GAMMA_SUPPORTED)
+         , &(png_ptr->background_1),
          png_ptr->gamma_table, png_ptr->gamma_from_1,
          png_ptr->gamma_to_1, png_ptr->gamma_16_table,
          png_ptr->gamma_16_from_1, png_ptr->gamma_16_to_1,
-         png_ptr->gamma_shift);
+         png_ptr->gamma_shift
+#endif
+);
 #endif
 
 #if defined(PNG_READ_GAMMA_SUPPORTED)
@@ -2531,11 +2548,14 @@ png_correct_palette(png_structp png_ptr, png_colorp palette,
  */
 void /* PRIVATE */
 png_do_background(png_row_infop row_info, png_bytep row,
-   png_color_16p trans_values, png_color_16p background,
-   png_color_16p background_1,
+   png_color_16p trans_values, png_color_16p background
+#if defined(PNG_READ_GAMMA_SUPPORTED)
+   , png_color_16p background_1,
    png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
    png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
-   png_uint_16pp gamma_16_to_1, int gamma_shift)
+   png_uint_16pp gamma_16_to_1, int gamma_shift
+#endif
+   )
 {
    png_bytep sp, dp;
    png_uint_32 i;
@@ -2918,6 +2938,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
                      {
                         *dp = *sp;
                      }
+#if defined(PNG_READ_GAMMA_SUPPORTED)
                      else if (a == 0)
                      {
                         *dp = (png_byte)background->gray;
@@ -2926,6 +2947,9 @@ png_do_background(png_row_infop row_info, png_bytep row,
                      {
                         png_composite(*dp, *sp, a, background_1->gray);
                      }
+#else
+                     *dp = (png_byte)background->gray;
+#endif
                   }
                }
             }
@@ -2949,12 +2973,17 @@ png_do_background(png_row_infop row_info, png_bytep row,
                         *dp = (png_byte)((v >> 8) & 0xff);
                         *(dp + 1) = (png_byte)(v & 0xff);
                      }
+#if defined(PNG_READ_GAMMA_SUPPORTED)
                      else if (a == 0)
+#else
+                     else
+#endif
                      {
                         /* background is already in screen gamma */
                         *dp = (png_byte)((background->gray >> 8) & 0xff);
                         *(dp + 1) = (png_byte)(background->gray & 0xff);
                      }
+#if defined(PNG_READ_GAMMA_SUPPORTED)
                      else
                      {
                         png_uint_16 g, v, w;
@@ -2965,6 +2994,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
                         *dp = (png_byte)((w >> 8) & 0xff);
                         *(dp + 1) = (png_byte)(w & 0xff);
                      }
+#endif
                   }
                }
                else
@@ -2979,11 +3009,16 @@ png_do_background(png_row_infop row_info, png_bytep row,
                      {
                         png_memcpy(dp, sp, 2);
                      }
+#if defined(PNG_READ_GAMMA_SUPPORTED)
                      else if (a == 0)
+#else
+                     else
+#endif
                      {
                         *dp = (png_byte)((background->gray >> 8) & 0xff);
                         *(dp + 1) = (png_byte)(background->gray & 0xff);
                      }
+#if defined(PNG_READ_GAMMA_SUPPORTED)
                      else
                      {
                         png_uint_16 g, v;
@@ -2993,6 +3028,7 @@ png_do_background(png_row_infop row_info, png_bytep row,
                         *dp = (png_byte)((v >> 8) & 0xff);
                         *(dp + 1) = (png_byte)(v & 0xff);
                      }
+#endif
                   }
                }
             }
@@ -4039,3 +4075,63 @@ png_build_gamma_table(png_structp png_ptr)
 /* To do: install integer version of png_build_gamma_table here */
 #endif
 
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+/* undoes intrapixel differencing  */
+void /* PRIVATE */
+png_do_read_intrapixel(png_row_infop row_info, png_bytep row)
+{
+   png_debug(1, "in png_do_read_intrapixel\n");
+   if (
+#if defined(PNG_USELESS_TESTS_SUPPORTED)
+       row != NULL && row_info != NULL &&
+#endif
+       (row_info->color_type & PNG_COLOR_MASK_COLOR))
+   {
+      int bytes_per_pixel;
+      png_uint_32 row_width = row_info->width;
+      if (row_info->bit_depth == 8)
+      {
+         png_bytep rp;
+         png_uint_32 i;
+
+         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+            bytes_per_pixel = 3;
+         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+            bytes_per_pixel = 4;
+         else
+            return;
+
+         for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
+         {
+            *(rp) = (png_byte)((256 + *rp + *(rp+1))&0xff);
+            *(rp+2) = (png_byte)((256 + *(rp+2) + *(rp+1))&0xff);
+         }
+      }
+      else if (row_info->bit_depth == 16)
+      {
+         png_bytep rp;
+         png_uint_32 i;
+
+         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+            bytes_per_pixel = 6;
+         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+            bytes_per_pixel = 8;
+         else
+            return;
+
+         for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
+         {
+            png_uint_32 s0=*(rp  )<<8 | *(rp+1);
+            png_uint_32 s1=*(rp+2)<<8 | *(rp+3);
+            png_uint_32 s2=*(rp+4)<<8 | *(rp+5);
+            png_uint_32 red=(65536+s0+s1)&0xffff;
+            png_uint_32 blue=(65536+s2+s1)&0xffff;
+            *(rp  ) = (png_byte)((red>>8)&0xff);
+            *(rp+1) = (png_byte)(red&0xff);
+            *(rp+4) = (png_byte)((blue>>8)&0xff);
+            *(rp+5) = (png_byte)(blue&0xff);
+         }
+      }
+   }
+}
+#endif /* PNG_MNG_FEATURES_SUPPORTED */

pngrutil.c

@@ -1,11 +1,11 @@
 
 /* pngrutil.c - utilities to read a PNG file
  *
- * libpng 1.0.7beta13 - May 16, 2000
+ * libpng 1.2.1beta3 - October 27, 2001
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2001 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.)
  *
  * This file contains routines that are only called from within
  * libpng itself during the course of reading an image.
@@ -14,6 +14,30 @@
 #define PNG_INTERNAL
 #include "png.h"
 
+#if defined(_WIN32_WCE)
+/* strtod() function is not supported on WindowsCE */
+#  ifdef PNG_FLOATING_POINT_SUPPORTED
+__inline double strtod(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));
+   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);
+   }
+   return result;
+}
+#  endif
+#endif
+
 #ifndef PNG_READ_BIG_ENDIAN_SUPPORTED
 /* Grab an unsigned 32-bit integer from a buffer in big-endian format. */
 png_uint_32 /* PRIVATE */
@@ -150,8 +174,9 @@ png_decompress_chunk(png_structp png_ptr, int comp_type,
    png_charp text = NULL;
    png_size_t text_size;
 
-   if (comp_type == PNG_TEXT_COMPRESSION_zTXt)
+   if (comp_type == PNG_COMPRESSION_TYPE_BASE)
    {
+      int ret = Z_OK;
       png_ptr->zstream.next_in = (png_bytep)(chunkdata + prefix_size);
       png_ptr->zstream.avail_in = (uInt)(chunklength - prefix_size);
       png_ptr->zstream.next_out = png_ptr->zbuf;
@@ -162,7 +187,7 @@ png_decompress_chunk(png_structp png_ptr, int comp_type,
 
       while (png_ptr->zstream.avail_in)
       {
-         int ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
+         ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
          if (ret != Z_OK && ret != Z_STREAM_END)
          {
             if (png_ptr->zstream.msg != NULL)
@@ -195,7 +220,7 @@ png_decompress_chunk(png_structp png_ptr, int comp_type,
                    png_ptr->zbuf_size - png_ptr->zstream.avail_out;
                text = (png_charp)png_malloc(png_ptr, text_size + 1);
                png_memcpy(text + prefix_size, png_ptr->zbuf,
-                          text_size - prefix_size);
+                    text_size - prefix_size);
                png_memcpy(text, chunkdata, prefix_size);
                *(text + text_size) = 0x00;
             }
@@ -222,6 +247,33 @@ 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];
+
+         if (ret == Z_BUF_ERROR)
+            sprintf(umsg,"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_ptr->chunk_name);
+         else
+            sprintf(umsg,"Incomplete compressed datastream in %s chunk",
+                png_ptr->chunk_name);
+         png_warning(png_ptr, umsg);
+#else
+         png_warning(png_ptr,
+            "Incomplete compressed datastream in chunk other than IDAT");
+#endif
+         text_size=prefix_size;
+         if (text ==  NULL)
+         {
+            text = (png_charp)png_malloc(png_ptr, text_size+1);
+            png_memcpy(text, chunkdata, prefix_size);
+         }
+         *(text + text_size) = 0x00;
+      }
 
       inflateReset(&png_ptr->zstream);
       png_ptr->zstream.avail_in = 0;
@@ -230,9 +282,9 @@ png_decompress_chunk(png_structp png_ptr, int comp_type,
       chunkdata = text;
       *newlength=text_size;
    }
-   else /* if (comp_type >= PNG_TEXT_COMPRESSION_LAST) */
+   else /* if (comp_type != PNG_COMPRESSION_TYPE_BASE) */
    {
-#if !defined(PNG_NO_STDIO)
+#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
       char umsg[50];
 
       sprintf(umsg, "Unknown zTXt compression type %d", comp_type);
@@ -241,10 +293,8 @@ png_decompress_chunk(png_structp png_ptr, int comp_type,
       png_warning(png_ptr, "Unknown zTXt compression type");
 #endif
 
-      /* Copy what we can of the error message into the text chunk */
-      text_size = (png_size_t)(chunklength - (text - chunkdata));
-      text_size = sizeof(msg) > text_size ? text_size : sizeof(msg);
-      png_memcpy(text, msg, text_size);
+      *(chunkdata + prefix_size) = 0x00;
+      *newlength=prefix_size;
    }
 
    return chunkdata;
@@ -282,34 +332,6 @@ png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    filter_type = buf[11];
    interlace_type = buf[12];
 
-   /* check for width and height valid values */
-   if (width == 0 || width > PNG_MAX_UINT || height == 0 ||
-        height > PNG_MAX_UINT)
-      png_error(png_ptr, "Invalid image size in IHDR");
-
-   /* check other values */
-   if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 &&
-      bit_depth != 8 && bit_depth != 16)
-      png_error(png_ptr, "Invalid bit depth in IHDR");
-
-   if (color_type < 0 || color_type == 1 ||
-      color_type == 5 || color_type > 6)
-      png_error(png_ptr, "Invalid color type in IHDR");
-
-   if (((color_type == PNG_COLOR_TYPE_PALETTE) && bit_depth > 8) ||
-       ((color_type == PNG_COLOR_TYPE_RGB ||
-         color_type == PNG_COLOR_TYPE_GRAY_ALPHA ||
-         color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8))
-      png_error(png_ptr, "Invalid color type/bit depth combination in IHDR");
-
-   if (interlace_type >= PNG_INTERLACE_LAST)
-      png_error(png_ptr, "Unknown interlace method in IHDR");
-
-   if (compression_type != PNG_COMPRESSION_TYPE_BASE)
-      png_error(png_ptr, "Unknown compression method in IHDR");
-
-   if (filter_type != PNG_FILTER_TYPE_BASE)
-      png_error(png_ptr, "Unknown filter method in IHDR");
 
    /* set internal variables */
    png_ptr->width = width;
@@ -317,6 +339,9 @@ png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    png_ptr->bit_depth = (png_byte)bit_depth;
    png_ptr->interlaced = (png_byte)interlace_type;
    png_ptr->color_type = (png_byte)color_type;
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+   png_ptr->filter_type = (png_byte)filter_type;
+#endif
 
    /* find number of channels */
    switch (png_ptr->color_type)
@@ -343,7 +368,7 @@ png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
       (png_uint_32)png_ptr->pixel_depth + 7) >> 3);
    png_debug1(3,"bit_depth = %d\n", png_ptr->bit_depth);
    png_debug1(3,"channels = %d\n", png_ptr->channels);
-   png_debug1(3,"rowbytes = %d\n", png_ptr->rowbytes);
+   png_debug1(3,"rowbytes = %lu\n", png_ptr->rowbytes);
    png_set_IHDR(png_ptr, info_ptr, width, height, bit_depth,
       color_type, interlace_type, compression_type, filter_type);
 }
@@ -352,8 +377,11 @@ png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 void /* PRIVATE */
 png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 {
-   png_colorp palette;
+   png_color palette[PNG_MAX_PALETTE_LENGTH];
    int num, i;
+#ifndef PNG_NO_POINTER_INDEXING
+   png_colorp pal_ptr;
+#endif
 
    png_debug(1, "in png_handle_PLTE\n");
 
@@ -370,6 +398,13 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 
    png_ptr->mode |= PNG_HAVE_PLTE;
 
+   if (!(png_ptr->color_type&PNG_COLOR_MASK_COLOR))
+   {
+      png_warning(png_ptr,
+        "Ignoring PLTE chunk in grayscale PNG");
+      png_crc_finish(png_ptr, length);
+      return;
+   }
 #if !defined(PNG_READ_OPT_PLTE_SUPPORTED)
    if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE)
    {
@@ -378,7 +413,7 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    }
 #endif
 
-   if (length % 3)
+   if (length > 3*PNG_MAX_PALETTE_LENGTH || length % 3)
    {
       if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE)
       {
@@ -394,8 +429,17 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 
    num = (int)length / 3;
 
-   palette = (png_colorp)png_zalloc(png_ptr, (uInt)num, sizeof (png_color));
+#ifndef PNG_NO_POINTER_INDEXING
+   for (i = 0, pal_ptr = palette; i < num; i++, pal_ptr++)
+   {
+      png_byte buf[3];
 
+      png_crc_read(png_ptr, buf, 3);
+      pal_ptr->red = buf[0];
+      pal_ptr->green = buf[1];
+      pal_ptr->blue = buf[2];
+   }
+#else
    for (i = 0; i < num; i++)
    {
       png_byte buf[3];
@@ -406,6 +450,7 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
       palette[i].green = buf[1];
       palette[i].blue = buf[2];
    }
+#endif
 
    /* If we actually NEED the PLTE chunk (ie for a paletted image), we do
       whatever the normal CRC configuration tells us.  However, if we
@@ -433,7 +478,6 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
          else
          {
             png_chunk_warning(png_ptr, "CRC error");
-            png_zfree(png_ptr, palette);
             return;
          }
       }
@@ -444,15 +488,7 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
       }
    }
 #endif
-   png_ptr->palette = palette;
-   png_ptr->num_palette = (png_uint_16)num;
 
-#ifdef PNG_FREE_ME_SUPPORTED
-   png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
-   png_ptr->free_me |= PNG_FREE_PLTE;
-#else
-   png_ptr->flags |= PNG_FLAG_FREE_PLTE;
-#endif
    png_set_PLTE(png_ptr, info_ptr, palette, num);
 
 #if defined(PNG_READ_tRNS_SUPPORTED)
@@ -485,9 +521,7 @@ png_handle_IEND(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    {
       png_error(png_ptr, "No image in file");
 
-      /* to quiet compiler warnings about unused info_ptr */
-      if (info_ptr == NULL)
-         return;
+      info_ptr = info_ptr; /* quiet compiler warnings about unused info_ptr */
    }
 
    png_ptr->mode |= (PNG_AFTER_IDAT | PNG_HAVE_IEND);
@@ -548,7 +582,11 @@ png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    igamma = (png_fixed_point)png_get_uint_32(buf);
    /* check for zero gamma */
    if (igamma == 0)
-      return;
+      {
+         png_warning(png_ptr,
+           "Ignoring gAMA chunk with gamma=0");
+         return;
+      }
 
 #if defined(PNG_READ_sRGB_SUPPORTED)
    if (info_ptr->valid & PNG_INFO_sRGB)
@@ -556,7 +594,7 @@ png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
       {
          png_warning(png_ptr,
            "Ignoring incorrect gAMA value when sRGB is also present");
-#ifndef PNG_NO_STDIO
+#ifndef PNG_NO_CONSOLE_IO
          fprintf(stderr, "gamma = (%d/100000)\n", (int)igamma);
 #endif
          return;
@@ -756,17 +794,17 @@ png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
       {
       if (abs(int_x_white - 31270L) > 1000 ||
           abs(int_y_white - 32900L) > 1000 ||
-          abs(  int_x_red - 64000L) > 1000 ||
-          abs(  int_y_red - 33000L) > 1000 ||
+          abs(int_x_red   - 64000L) > 1000 ||
+          abs(int_y_red   - 33000L) > 1000 ||
           abs(int_x_green - 30000L) > 1000 ||
           abs(int_y_green - 60000L) > 1000 ||
-          abs( int_x_blue - 15000L) > 1000 ||
-          abs( int_y_blue -  6000L) > 1000)
+          abs(int_x_blue  - 15000L) > 1000 ||
+          abs(int_y_blue  -  6000L) > 1000)
          {
 
             png_warning(png_ptr,
               "Ignoring incorrect cHRM value when sRGB is also present");
-#ifndef PNG_NO_STDIO
+#ifndef PNG_NO_CONSOLE_IO
 #ifdef PNG_FLOATING_POINT_SUPPORTED
             fprintf(stderr,"wx=%f, wy=%f, rx=%f, ry=%f\n",
                white_x, white_y, red_x, red_y);
@@ -778,7 +816,7 @@ png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
             fprintf(stderr,"gx=%ld, gy=%ld, bx=%ld, by=%ld\n",
                int_x_green, int_y_green, int_x_blue, int_y_blue);
 #endif
-#endif /* PNG_NO_STDIO */
+#endif /* PNG_NO_CONSOLE_IO */
          }
          png_crc_finish(png_ptr, 0);
          return;
@@ -872,7 +910,7 @@ png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
       {
          png_warning(png_ptr,
            "Ignoring incorrect gAMA value when sRGB is also present");
-#ifndef PNG_NO_STDIO
+#ifndef PNG_NO_CONSOLE_IO
 #  ifdef PNG_FIXED_POINT_SUPPORTED
          fprintf(stderr,"incorrect gamma=(%d/100000)\n",(int)png_ptr->int_gamma);
 #  else
@@ -890,12 +928,12 @@ png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    if (info_ptr->valid & PNG_INFO_cHRM)
       if (abs(info_ptr->int_x_white - 31270L) > 1000 ||
           abs(info_ptr->int_y_white - 32900L) > 1000 ||
-          abs(  info_ptr->int_x_red - 64000L) > 1000 ||
-          abs(  info_ptr->int_y_red - 33000L) > 1000 ||
+          abs(info_ptr->int_x_red   - 64000L) > 1000 ||
+          abs(info_ptr->int_y_red   - 33000L) > 1000 ||
           abs(info_ptr->int_x_green - 30000L) > 1000 ||
           abs(info_ptr->int_y_green - 60000L) > 1000 ||
-          abs( info_ptr->int_x_blue - 15000L) > 1000 ||
-          abs( info_ptr->int_y_blue -  6000L) > 1000)
+          abs(info_ptr->int_x_blue  - 15000L) > 1000 ||
+          abs(info_ptr->int_y_blue  -  6000L) > 1000)
          {
             png_warning(png_ptr,
               "Ignoring incorrect cHRM value when sRGB is also present");
@@ -916,6 +954,8 @@ png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    png_byte compression_type;
    png_charp profile;
    png_uint_32 skip = 0;
+   png_uint_32 profile_size = 0;
+   png_uint_32 profile_length = 0;
    png_size_t slength, prefix_length, data_length;
 
    png_debug(1, "in png_handle_iCCP\n");
@@ -962,26 +1002,58 @@ png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 
    for (profile = chunkdata; *profile; profile++)
       /* empty loop to find end of name */ ;
+
    ++profile;
 
-   /* there should be at least one NUL (the compression type byte)
+   /* 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)
    {
       png_free(png_ptr, chunkdata);
-      png_warning(png_ptr, "malformed iCCP chunk");
+      png_warning(png_ptr, "Malformed iCCP chunk");
       return;
    }
 
-   /* compression should always be zero */
+   /* compression_type should always be zero */
    compression_type = *profile++;
+   if (compression_type)
+   {
+      png_warning(png_ptr, "Ignoring nonzero compression type in iCCP chunk");
+      compression_type=0x00;  /* Reset it to zero (libpng-1.0.6 through 1.0.8
+                                 wrote nonzero) */
+   }
 
    prefix_length = profile - chunkdata;
    chunkdata = png_decompress_chunk(png_ptr, compression_type, chunkdata,
                                     slength, prefix_length, &data_length);
 
+   profile_length = data_length - prefix_length;
+
+   if ( profile_length < 4)
+   {
+      png_free(png_ptr, chunkdata);
+      png_warning(png_ptr, "Profile size field missing from iCCP chunk");
+      return;
+   }
+
+   /* Check the profile_size recorded in the first 32 bits of the ICC profile */
+   profile_size = ((*(chunkdata+prefix_length))<<24) |
+                  ((*(chunkdata+prefix_length+1))<<16) |
+                  ((*(chunkdata+prefix_length+2))<< 8) |
+                  ((*(chunkdata+prefix_length+3))    );
+
+   if(profile_size < profile_length)
+      profile_length = profile_size;
+
+   if(profile_size > profile_length)
+   {
+      png_free(png_ptr, chunkdata);
+      png_warning(png_ptr, "Ignoring truncated iCCP profile.\n");
+      return;
+   }
+
    png_set_iCCP(png_ptr, info_ptr, chunkdata, compression_type,
-                chunkdata + prefix_length, data_length);
+                chunkdata + prefix_length, profile_length);
    png_free(png_ptr, chunkdata);
 }
 #endif /* PNG_READ_iCCP_SUPPORTED */
@@ -994,6 +1066,9 @@ png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    png_bytep chunkdata;
    png_bytep entry_start;
    png_sPLT_t new_palette;
+#ifdef PNG_NO_POINTER_INDEXING
+   png_sPLT_entryp pp;
+#endif
    int data_length, entry_size, i;
    png_uint_32 skip = 0;
    png_size_t slength;
@@ -1020,7 +1095,7 @@ png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 
    chunkdata = (png_bytep)png_malloc(png_ptr, length + 1);
    slength = (png_size_t)length;
-   png_crc_read(png_ptr, chunkdata, slength);
+   png_crc_read(png_ptr, (png_bytep)chunkdata, slength);
 
    if (png_crc_finish(png_ptr, skip))
    {
@@ -1050,13 +1125,15 @@ png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    if (data_length % entry_size)
    {
       png_free(png_ptr, chunkdata);
-      png_error(png_ptr, "sPLT chunk has bad length");
+      png_warning(png_ptr, "sPLT chunk has bad length");
+      return;
    }
 
    new_palette.nentries = data_length / entry_size;
    new_palette.entries = (png_sPLT_entryp)png_malloc(
        png_ptr, new_palette.nentries * sizeof(png_sPLT_entry));
 
+#ifndef PNG_NO_POINTER_INDEXING
    for (i = 0; i < new_palette.nentries; i++)
    {
       png_sPLT_entryp pp = new_palette.entries + i;
@@ -1077,6 +1154,28 @@ png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
       }
       pp->frequency = png_get_uint_16(entry_start); entry_start += 2;
    }
+#else
+   pp = new_palette.entries;
+   for (i = 0; i < new_palette.nentries; i++)
+   {
+
+      if (new_palette.depth == 8)
+      {
+          pp[i].red   = *entry_start++;
+          pp[i].green = *entry_start++;
+          pp[i].blue  = *entry_start++;
+          pp[i].alpha = *entry_start++;
+      }
+      else
+      {
+          pp[i].red   = png_get_uint_16(entry_start); entry_start += 2;
+          pp[i].green = png_get_uint_16(entry_start); entry_start += 2;
+          pp[i].blue  = png_get_uint_16(entry_start); entry_start += 2;
+          pp[i].alpha = png_get_uint_16(entry_start); entry_start += 2;
+      }
+      pp->frequency = png_get_uint_16(entry_start); entry_start += 2;
+   }
+#endif
 
    /* discard all chunk data except the name and stash that */
    new_palette.name = (png_charp)chunkdata;
@@ -1092,6 +1191,8 @@ png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 void /* PRIVATE */
 png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 {
+   png_byte	readbuf[PNG_MAX_PALETTE_LENGTH];
+
    png_debug(1, "in png_handle_tRNS\n");
 
    if (!(png_ptr->mode & PNG_HAVE_IHDR))
@@ -1129,8 +1230,7 @@ png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
          return;
       }
 
-      png_ptr->trans = (png_bytep)png_malloc(png_ptr, length);
-      png_crc_read(png_ptr, png_ptr->trans, (png_size_t)length);
+      png_crc_read(png_ptr, readbuf, (png_size_t)length);
       png_ptr->num_trans = (png_uint_16)length;
    }
    else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
@@ -1175,13 +1275,7 @@ png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    if (png_crc_finish(png_ptr, 0))
       return;
 
-#ifdef PNG_FREE_ME_SUPPORTED
-   png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
-   png_ptr->free_me |= PNG_FREE_TRNS;
-#else
-   png_ptr->flags |= PNG_FLAG_FREE_TRNS;
-#endif
-   png_set_tRNS(png_ptr, info_ptr, png_ptr->trans, png_ptr->num_trans,
+   png_set_tRNS(png_ptr, info_ptr, readbuf, png_ptr->num_trans,
       &(png_ptr->trans_values));
 }
 #endif
@@ -1247,7 +1341,6 @@ png_handle_bKGD(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
           if(buf[0] > info_ptr->num_palette)
           {
              png_warning(png_ptr, "Incorrect bKGD chunk index value");
-             png_crc_finish(png_ptr, length);
              return;
           }
           png_ptr->background.red =
@@ -1281,6 +1374,7 @@ void /* PRIVATE */
 png_handle_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 {
    int num, i;
+   png_uint_16	readbuf[PNG_MAX_PALETTE_LENGTH];
 
    png_debug(1, "in png_handle_hIST\n");
 
@@ -1305,34 +1399,26 @@ png_handle_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
       return;
    }
 
-   if (length != (png_uint_32)(2 * png_ptr->num_palette))
+   num = (int)length / 2 ;
+   if (num != png_ptr->num_palette)
    {
       png_warning(png_ptr, "Incorrect hIST chunk length");
       png_crc_finish(png_ptr, length);
       return;
    }
 
-   num = (int)length / 2 ;
-   png_ptr->hist = (png_uint_16p)png_malloc(png_ptr,
-      (png_uint_32)(num * sizeof (png_uint_16)));
    for (i = 0; i < num; i++)
    {
       png_byte buf[2];
 
       png_crc_read(png_ptr, buf, 2);
-      png_ptr->hist[i] = png_get_uint_16(buf);
+      readbuf[i] = png_get_uint_16(buf);
    }
 
    if (png_crc_finish(png_ptr, 0))
       return;
 
-#ifdef PNG_FREE_ME_SUPPORTED
-   png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
-   png_ptr->free_me |= PNG_FREE_HIST;
-#else
-   png_ptr->flags |= PNG_FLAG_FREE_HIST;
-#endif
-   png_set_hIST(png_ptr, info_ptr, png_ptr->hist);
+   png_set_hIST(png_ptr, info_ptr, readbuf);
 }
 #endif
 
@@ -1347,16 +1433,16 @@ png_handle_pHYs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    png_debug(1, "in png_handle_pHYs\n");
 
    if (!(png_ptr->mode & PNG_HAVE_IHDR))
-      png_error(png_ptr, "Missing IHDR before pHYS");
+      png_error(png_ptr, "Missing IHDR before pHYs");
    else if (png_ptr->mode & PNG_HAVE_IDAT)
    {
-      png_warning(png_ptr, "Invalid pHYS after IDAT");
+      png_warning(png_ptr, "Invalid pHYs after IDAT");
       png_crc_finish(png_ptr, length);
       return;
    }
    else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
    {
-      png_warning(png_ptr, "Duplicate pHYS chunk");
+      png_warning(png_ptr, "Duplicate pHYs chunk");
       png_crc_finish(png_ptr, length);
       return;
    }
@@ -1423,7 +1509,7 @@ png_handle_oFFs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 #endif
 
 #if defined(PNG_READ_pCAL_SUPPORTED)
-/* read the pCAL chunk (png-scivis-19970203) */
+/* read the pCAL chunk (described in the PNG Extensions document) */
 void /* PRIVATE */
 png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 {
@@ -1452,7 +1538,7 @@ png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
       return;
    }
 
-   png_debug1(2, "Allocating and reading pCAL chunk data (%d bytes)\n",
+   png_debug1(2, "Allocating and reading pCAL chunk data (%lu bytes)\n",
       length + 1);
    purpose = (png_charp)png_malloc(png_ptr, length + 1);
    slength = (png_size_t)length;
@@ -1572,7 +1658,7 @@ png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
       return;
    }
 
-   png_debug1(2, "Allocating and reading sCAL chunk data (%d bytes)\n",
+   png_debug1(2, "Allocating and reading sCAL chunk data (%lu bytes)\n",
       length + 1);
    buffer = (png_charp)png_malloc(png_ptr, length + 1);
    slength = (png_size_t)length;
@@ -1597,8 +1683,8 @@ png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    }
 #else
 #ifdef PNG_FIXED_POINT_SUPPORTED
-   swidth = (png_charp)png_malloc(png_ptr, strlen(ep) + 1);
-   png_memcpy(swidth, ep, (png_size_t)strlen(ep));
+   swidth = (png_charp)png_malloc(png_ptr, png_strlen(ep) + 1);
+   png_memcpy(swidth, ep, (png_size_t)png_strlen(ep));
 #endif
 #endif
 
@@ -1615,8 +1701,8 @@ 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(png_ptr, strlen(ep) + 1);
-   png_memcpy(sheight, ep, (png_size_t)strlen(ep));
+   sheight = (png_charp)png_malloc(png_ptr, png_strlen(ep) + 1);
+   png_memcpy(sheight, ep, (png_size_t)png_strlen(ep));
 #endif
 #endif
 
@@ -1789,7 +1875,7 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 #endif
 
    chunkdata = (png_charp)png_malloc(png_ptr, length + 1);
-   slength = (png_size_t)length;
+     slength = (png_size_t)length;
    png_crc_read(png_ptr, (png_bytep)chunkdata, slength);
    if (png_crc_finish(png_ptr, 0))
    {
@@ -1811,6 +1897,11 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    else
    {
        comp_type = *(++text);
+       if (comp_type != PNG_TEXT_COMPRESSION_zTXt)
+       {
+          png_warning(png_ptr, "Unknown compression type in zTXt chunk");
+          comp_type = PNG_TEXT_COMPRESSION_zTXt;
+       }
        text++;        /* skip the compression_method byte */
    }
    prefix_len = text - chunkdata;
@@ -1958,7 +2049,7 @@ png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
       if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
            HANDLE_CHUNK_ALWAYS
 #if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
-           && png_ptr->read_user_chunk_fn == (png_user_chunk_ptr)NULL
+           && png_ptr->read_user_chunk_fn == NULL
 #endif
         )
 #endif
@@ -1978,12 +2069,12 @@ png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
            length = (png_uint_32)65535L;
        }
 #endif
-       strcpy((png_charp)chunk.name, (png_charp)png_ptr->chunk_name);
+       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;
+       chunk.size = (png_size_t)length;
+       png_crc_read(png_ptr, (png_bytep)chunk.data, length);
 #if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
-       if(png_ptr->read_user_chunk_fn != (png_user_chunk_ptr)NULL)
+       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)
@@ -2007,8 +2098,7 @@ 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 */ ;
+   info_ptr = info_ptr; /* quiet compiler warnings about unused info_ptr */
 #endif
 }
 
@@ -2041,13 +2131,9 @@ 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 */
-#ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
-png_combine_row_c
-#else
-png_combine_row
-#endif /* PNG_HAVE_ASSEMBLER_COMBINE_ROW */
-   (png_structp png_ptr, png_bytep row, int mask)
+png_combine_row(png_structp png_ptr, png_bytep row, int mask)
 {
    png_debug(1,"in png_combine_row\n");
    if (mask == 0xff)
@@ -2247,25 +2333,28 @@ png_combine_row
       }
    }
 }
+#endif /* !PNG_HAVE_ASSEMBLER_COMBINE_ROW */
 
-#if defined(PNG_READ_INTERLACING_SUPPORTED)
-void /* PRIVATE */
-#ifdef PNG_HAVE_ASSEMBLER_READ_INTERLACE
-png_do_read_interlace_c
-#else
-png_do_read_interlace
-#endif /* PNG_HAVE_ASSEMBLER_READ_INTERLACE */
-   (png_row_infop row_info, png_bytep row, int pass,
+#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)
+ */
+void /* PRIVATE */
+png_do_read_interlace(png_structp png_ptr)
 {
+   png_row_infop row_info = &(png_ptr->row_info);
+   png_bytep row = png_ptr->row_buf + 1;
+   int pass = png_ptr->pass;
+   png_uint_32 transformations = png_ptr->transformations;
 #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};
 #endif
 
-   png_debug(1,"in png_do_read_interlace\n");
+   png_debug(1,"in png_do_read_interlace (stock C version)\n");
    if (row != NULL && row_info != NULL)
    {
       png_uint_32 final_width;
@@ -2469,20 +2558,20 @@ png_do_read_interlace
       row_info->rowbytes = ((final_width *
          (png_uint_32)row_info->pixel_depth + 7) >> 3);
    }
-}
+#if !defined(PNG_READ_PACKSWAP_SUPPORTED)
+   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 */
-#ifdef PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
-png_read_filter_row_c
-#else
-png_read_filter_row
-#endif /* PNG_HAVE_ASSEMBLER_READ_FILTER_ROW */
-   (png_structp png_ptr, png_row_infop row_info, png_bytep row,
+png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep row,
    png_bytep prev_row, int filter)
 {
    png_debug(1, "in png_read_filter_row\n");
-   png_debug2(2,"row = %d, filter = %d\n", png_ptr->row_number, filter);
+   png_debug2(2,"row = %lu, filter = %d\n", png_ptr->row_number, filter);
    switch (filter)
    {
       case PNG_FILTER_VALUE_NONE:
@@ -2599,6 +2688,7 @@ png_read_filter_row
          break;
    }
 }
+#endif /* !PNG_HAVE_ASSEMBLER_READ_FILTER_ROW */
 
 void /* PRIVATE */
 png_read_finish_row(png_structp png_ptr)
@@ -2885,7 +2975,11 @@ 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->row_buf = (png_bytep)png_malloc(png_ptr, row_bytes);
+   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
 
 #ifdef PNG_MAX_MALLOC_64K
    if ((png_uint_32)png_ptr->rowbytes + 1 > (png_uint_32)65536L)
@@ -2896,12 +2990,12 @@ defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
 
    png_memset_check(png_ptr, png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
 
-   png_debug1(3, "width = %d,\n", png_ptr->width);
-   png_debug1(3, "height = %d,\n", png_ptr->height);
-   png_debug1(3, "iwidth = %d,\n", png_ptr->iwidth);
-   png_debug1(3, "num_rows = %d\n", png_ptr->num_rows);
-   png_debug1(3, "rowbytes = %d,\n", png_ptr->rowbytes);
-   png_debug1(3, "irowbytes = %d,\n", png_ptr->irowbytes);
+   png_debug1(3, "width = %lu,\n", png_ptr->width);
+   png_debug1(3, "height = %lu,\n", png_ptr->height);
+   png_debug1(3, "iwidth = %lu,\n", png_ptr->iwidth);
+   png_debug1(3, "num_rows = %lu\n", png_ptr->num_rows);
+   png_debug1(3, "rowbytes = %lu,\n", png_ptr->rowbytes);
+   png_debug1(3, "irowbytes = %lu,\n", png_ptr->irowbytes);
 
    png_ptr->flags |= PNG_FLAG_ROW_INIT;
 }

pngset.c

@@ -1,11 +1,11 @@
 
 /* pngset.c - storage of image information into info struct
  *
- * libpng 1.0.7beta13 - May 16, 2000
+ * libpng 1.2.1beta3 - October 27, 2001
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2001 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.)
  *
  * The functions here are used during reads to store data from the file
  * into the info struct, and during writes to store application data
@@ -109,9 +109,10 @@ png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
    info_ptr->int_gamma = (int)(file_gamma*100000.+.5);
 #endif
    info_ptr->valid |= PNG_INFO_gAMA;
+   if(file_gamma == 0.0)
+      png_warning(png_ptr, "Setting gamma=0");
 }
 #endif
-#endif
 void PNGAPI
 png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
    int_gamma)
@@ -127,18 +128,43 @@ png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
    info_ptr->int_gamma = int_gamma;
 #endif
    info_ptr->valid |= PNG_INFO_gAMA;
+   if(int_gamma == 0)
+      png_warning(png_ptr, "Setting gamma=0");
 }
+#endif
 
 #if defined(PNG_hIST_SUPPORTED)
 void PNGAPI
 png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
 {
+   int	i;
+
    png_debug1(1, "in %s storage function\n", "hIST");
    if (png_ptr == NULL || info_ptr == NULL)
       return;
+   if (info_ptr->num_palette == 0)
+   {
+       png_warning(png_ptr,
+          "Palette size 0, hIST allocation skipped.");
+       return;
+   }
 
-   info_ptr->hist = hist;
+#ifdef PNG_FREE_ME_SUPPORTED
+   png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
+#endif
+   png_ptr->hist = (png_uint_16p)png_malloc(png_ptr,
+      (png_uint_32)(info_ptr->num_palette * sizeof (png_uint_16)));
+
+   for (i = 0; i < info_ptr->num_palette; i++)
+       png_ptr->hist[i] = hist[i];
+   info_ptr->hist = png_ptr->hist;
    info_ptr->valid |= PNG_INFO_hIST;
+
+#ifdef PNG_FREE_ME_SUPPORTED
+   info_ptr->free_me |= PNG_FREE_HIST;
+#else
+   png_ptr->flags |= PNG_FLAG_FREE_HIST;
+#endif
 }
 #endif
 
@@ -153,6 +179,61 @@ png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
+   /* check for width and height valid values */
+   if (width == 0 || height == 0)
+      png_error(png_ptr, "Image width or height is zero in IHDR");
+   if (width > PNG_MAX_UINT || height > PNG_MAX_UINT)
+      png_error(png_ptr, "Invalid image size in IHDR");
+
+   /* check other values */
+   if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 &&
+      bit_depth != 8 && bit_depth != 16)
+      png_error(png_ptr, "Invalid bit depth in IHDR");
+
+   if (color_type < 0 || color_type == 1 ||
+      color_type == 5 || color_type > 6)
+      png_error(png_ptr, "Invalid color type in IHDR");
+
+   if (((color_type == PNG_COLOR_TYPE_PALETTE) && bit_depth > 8) ||
+       ((color_type == PNG_COLOR_TYPE_RGB ||
+         color_type == PNG_COLOR_TYPE_GRAY_ALPHA ||
+         color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8))
+      png_error(png_ptr, "Invalid color type/bit depth combination in IHDR");
+
+   if (interlace_type >= PNG_INTERLACE_LAST)
+      png_error(png_ptr, "Unknown interlace method in IHDR");
+
+   if (compression_type != PNG_COMPRESSION_TYPE_BASE)
+      png_error(png_ptr, "Unknown compression method in IHDR");
+
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+   /* Accept filter_method 64 (intrapixel differencing) only if
+    * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
+    * 2. Libpng did not read a PNG signature (this filter_method is only
+    *    used in PNG datastreams that are embedded in MNG datastreams) and
+    * 3. The application called png_permit_mng_features with a mask that
+    *    included PNG_FLAG_MNG_FILTER_64 and
+    * 4. The filter_method is 64 and
+    * 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");
+   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_ALPHA)))
+        png_error(png_ptr, "Unknown filter method in IHDR");
+     if(png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)
+        png_warning(png_ptr, "Invalid filter method in IHDR");
+   }
+#else
+   if(filter_type != PNG_FILTER_TYPE_BASE)
+      png_error(png_ptr, "Unknown filter method in IHDR");
+#endif
+
    info_ptr->width = width;
    info_ptr->height = height;
    info_ptr->bit_depth = (png_byte)bit_depth;
@@ -212,7 +293,7 @@ png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
       return;
 
    length = png_strlen(purpose) + 1;
-   png_debug1(3, "allocating purpose for info (%d bytes)\n", length);
+   png_debug1(3, "allocating purpose for info (%lu bytes)\n", length);
    info_ptr->pcal_purpose = (png_charp)png_malloc(png_ptr, length);
    png_memcpy(info_ptr->pcal_purpose, purpose, (png_size_t)length);
 
@@ -223,18 +304,19 @@ png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
    info_ptr->pcal_nparams = (png_byte)nparams;
 
    length = png_strlen(units) + 1;
-   png_debug1(3, "allocating units for info (%d bytes)\n", length);
+   png_debug1(3, "allocating units for info (%lu bytes)\n", length);
    info_ptr->pcal_units = (png_charp)png_malloc(png_ptr, length);
    png_memcpy(info_ptr->pcal_units, units, (png_size_t)length);
 
    info_ptr->pcal_params = (png_charpp)png_malloc(png_ptr,
       (png_uint_32)((nparams + 1) * sizeof(png_charp)));
+
    info_ptr->pcal_params[nparams] = NULL;
 
    for (i = 0; i < nparams; i++)
    {
       length = png_strlen(params[i]) + 1;
-      png_debug2(3, "allocating parameter %d for info (%d bytes)\n", i, length);
+      png_debug2(3, "allocating parameter %d for info (%lu bytes)\n", i, length);
       info_ptr->pcal_params[i] = (png_charp)png_malloc(png_ptr, length);
       png_memcpy(info_ptr->pcal_params[i], params[i], (png_size_t)length);
    }
@@ -283,7 +365,7 @@ png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
 
    length = png_strlen(sheight) + 1;
    png_debug1(3, "allocating unit for info (%d bytes)\n", length);
-   info_ptr->scal_s_width = (png_charp)png_malloc(png_ptr, length);
+   info_ptr->scal_s_height = (png_charp)png_malloc(png_ptr, length);
    png_memcpy(info_ptr->scal_s_height, sheight, (png_size_t)length);
 
    info_ptr->valid |= PNG_INFO_sCAL;
@@ -320,9 +402,26 @@ png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
-   info_ptr->palette = palette;
+   /*
+    * 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
+    * function used to do the allocation.
+    */
+#ifdef PNG_FREE_ME_SUPPORTED
+   png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
+#endif
+   png_ptr->palette = (png_colorp)png_zalloc(png_ptr, (uInt)num_palette,
+      sizeof (png_color));
+   png_memcpy(png_ptr->palette, palette, num_palette * sizeof (png_color));
+   info_ptr->palette = png_ptr->palette;
+   info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
+
+#ifdef PNG_FREE_ME_SUPPORTED
+   info_ptr->free_me |= PNG_FREE_PLTE;
+#else
+   png_ptr->flags |= PNG_FLAG_FREE_PLTE;
+#endif
 
-   info_ptr->num_palette = (png_uint_16)num_palette;
    info_ptr->valid |= PNG_INFO_PLTE;
 }
 
@@ -436,9 +535,9 @@ png_set_iCCP(png_structp png_ptr, png_infop info_ptr,
    if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
       return;
 
-   new_iccp_name = png_malloc(png_ptr, png_strlen(name)+1);
-   strcpy(new_iccp_name, name);
-   new_iccp_profile = png_malloc(png_ptr, proflen);
+   new_iccp_name = (png_charp)png_malloc(png_ptr, png_strlen(name)+1);
+   png_strcpy(new_iccp_name, name);
+   new_iccp_profile = (png_charp)png_malloc(png_ptr, proflen);
    png_memcpy(new_iccp_profile, profile, (png_size_t)proflen);
 
    png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
@@ -507,7 +606,7 @@ png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
       png_size_t lang_len,lang_key_len;
       png_textp textp = &(info_ptr->text[info_ptr->num_text]);
 
-      if (text_ptr[i].key == (png_charp)NULL)
+      if (text_ptr[i].key == NULL)
           continue;
 
       key_len = png_strlen(text_ptr[i].key);
@@ -521,11 +620,11 @@ png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
 #ifdef PNG_iTXt_SUPPORTED
       {
         /* set iTXt data */
-        if (text_ptr[i].key != (png_charp)NULL)
+        if (text_ptr[i].key != NULL)
           lang_len = png_strlen(text_ptr[i].lang);
         else
           lang_len = 0;
-        if (text_ptr[i].lang_key != (png_charp)NULL)
+        if (text_ptr[i].lang_key != NULL)
           lang_key_len = png_strlen(text_ptr[i].lang_key);
         else
           lang_key_len = 0;
@@ -537,7 +636,7 @@ png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
       }
 #endif
 
-      if (text_ptr[i].text == (png_charp)NULL || text_ptr[i].text[0] == '\0')
+      if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
       {
          text_length = 0;
 #ifdef PNG_iTXt_SUPPORTED
@@ -555,8 +654,9 @@ png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
 
       textp->key = (png_charp)png_malloc(png_ptr,
          (png_uint_32)(key_len + text_length + lang_len + lang_key_len + 4));
-      png_debug2(2, "Allocated %d bytes at %x in png_set_text\n",
-         key_len + lang_len + lang_key_len + text_length + 4, textp->key);
+      png_debug2(2, "Allocated %lu bytes at %x in png_set_text\n",
+         (png_uint_32)(key_len + lang_len + lang_key_len + text_length + 4),
+         (int)textp->key);
 
       png_memcpy(textp->key, text_ptr[i].key,
          (png_size_t)(key_len));
@@ -576,8 +676,8 @@ png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
 #endif
       {
 #ifdef PNG_iTXt_SUPPORTED
-         textp->lang=(png_charp)NULL;
-         textp->lang_key=(png_charp)NULL;
+         textp->lang=NULL;
+         textp->lang_key=NULL;
 #endif
          textp->text=textp->key + key_len + 1;
       }
@@ -631,7 +731,24 @@ png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
       return;
 
    if (trans != NULL)
-      info_ptr->trans = trans;
+   {
+       /*
+	* It may not actually be necessary to set png_ptr->trans here;
+	* 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
+       png_ptr->trans = info_ptr->trans = (png_bytep)png_malloc(png_ptr,
+           (png_uint_32)num_trans);
+       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
+   }
 
    if (trans_values != NULL)
    {
@@ -659,6 +776,7 @@ png_set_sPLT(png_structp png_ptr,
     png_memcpy(np, info_ptr->splt_palettes,
            info_ptr->splt_palettes_num * sizeof(png_sPLT_t));
     png_free(png_ptr, info_ptr->splt_palettes);
+    info_ptr->splt_palettes=NULL;
 
     for (i = 0; i < nentries; i++)
     {
@@ -666,12 +784,12 @@ png_set_sPLT(png_structp png_ptr,
         png_sPLT_tp from = entries + i;
 
         to->name = (png_charp)png_malloc(png_ptr,
-                                        png_strlen(from->name) + 1);
+            png_strlen(from->name) + 1);
         png_strcpy(to->name, from->name);
         to->entries = (png_sPLT_entryp)png_malloc(png_ptr,
-                                 from->nentries * sizeof(png_sPLT_t));
+            from->nentries * sizeof(png_sPLT_t));
         png_memcpy(to->entries, from->entries,
-               from->nentries * sizeof(png_sPLT_t));
+            from->nentries * sizeof(png_sPLT_t));
         to->nentries = from->nentries;
         to->depth = from->depth;
     }
@@ -685,7 +803,7 @@ png_set_sPLT(png_structp png_ptr,
 }
 #endif /* PNG_sPLT_SUPPORTED */
 
-#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
 void PNGAPI
 png_set_unknown_chunks(png_structp png_ptr,
    png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)
@@ -703,6 +821,7 @@ png_set_unknown_chunks(png_structp png_ptr,
     png_memcpy(np, info_ptr->unknown_chunks,
            info_ptr->unknown_chunks_num * sizeof(png_unknown_chunk));
     png_free(png_ptr, info_ptr->unknown_chunks);
+    info_ptr->unknown_chunks=NULL;
 
     for (i = 0; i < num_unknowns; i++)
     {
@@ -728,7 +847,7 @@ void PNGAPI
 png_set_unknown_chunk_location(png_structp png_ptr, png_infop info_ptr,
    int chunk, int location)
 {
-   if(png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk < 
+   if(png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk <
          (int)info_ptr->unknown_chunks_num)
       info_ptr->unknown_chunks[chunk].location = (png_byte)location;
 }
@@ -739,10 +858,27 @@ png_set_unknown_chunk_location(png_structp png_ptr, png_infop info_ptr,
 void PNGAPI
 png_permit_empty_plte (png_structp png_ptr, int empty_plte_permitted)
 {
-   png_debug1(1, "in png_permit_empty_plte\n", "");
+   /* This function is deprecated in favor of png_permit_mng_features()
+      and will be removed from libpng-2.0.0 */
+   png_debug(1, "in png_permit_empty_plte, DEPRECATED.\n");
    if (png_ptr == NULL)
       return;
-   png_ptr->empty_plte_permitted=(png_byte)empty_plte_permitted;
+   png_ptr->mng_features_permitted = (png_byte)
+     ((png_ptr->mng_features_permitted & (~(PNG_FLAG_MNG_EMPTY_PLTE))) |
+     ((empty_plte_permitted & PNG_FLAG_MNG_EMPTY_PLTE)));
+}
+#endif
+
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+png_uint_32 PNGAPI
+png_permit_mng_features (png_structp png_ptr, png_uint_32 mng_features)
+{
+   png_debug(1, "in png_permit_mng_features\n");
+   if (png_ptr == NULL)
+      return (png_uint_32)0;
+   png_ptr->mng_features_permitted =
+     (png_byte)(mng_features & PNG_ALL_MNG_FEATURES);
+   return (png_uint_32)png_ptr->mng_features_permitted;
 }
 #endif
 
@@ -769,13 +905,17 @@ png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_bytep
     if (chunk_list == NULL)
       return;
     old_num_chunks=png_ptr->num_chunk_list;
-    new_list=png_malloc(png_ptr,5*(num_chunks+old_num_chunks));
-    if(png_ptr->chunk_list != (png_bytep)NULL)
+    new_list=(png_bytep)png_malloc(png_ptr,
+       (png_uint_32)(5*(num_chunks+old_num_chunks)));
+    if(png_ptr->chunk_list != NULL)
     {
-       png_memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks);
+       png_memcpy(new_list, png_ptr->chunk_list,
+          (png_size_t)(5*old_num_chunks));
        png_free(png_ptr, png_ptr->chunk_list);
+       png_ptr->chunk_list=NULL;
     }
-    png_memcpy(new_list+5*old_num_chunks, chunk_list, 5*num_chunks);
+    png_memcpy(new_list+5*old_num_chunks, chunk_list,
+       (png_size_t)(5*num_chunks));
     for (p=new_list+5*old_num_chunks+4, i=0; i<num_chunks; i++, p+=5)
        *p=(png_byte)keep;
     png_ptr->num_chunk_list=old_num_chunks+num_chunks;
@@ -802,15 +942,15 @@ void PNGAPI
 png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers)
 {
    png_debug1(1, "in %s storage function\n", "rows");
+
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
    if(info_ptr->row_pointers && (info_ptr->row_pointers != row_pointers))
-   {
       png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
-      info_ptr->row_pointers = row_pointers;
-   }
-   info_ptr->valid |= PNG_INFO_IDAT;
+   info_ptr->row_pointers = row_pointers;
+   if(row_pointers)
+      info_ptr->valid |= PNG_INFO_IDAT;
 }
 #endif
 
@@ -824,3 +964,66 @@ png_set_compression_buffer_size(png_structp png_ptr, png_uint_32 size)
     png_ptr->zstream.next_out = png_ptr->zbuf;
     png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
 }
+
+void PNGAPI
+png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask)
+{
+   if (png_ptr && info_ptr)
+      info_ptr->valid &= ~(mask);
+}
+
+
+#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
+/* this 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 */
+}
+#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;
+}
+#endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */

pngtest.c

@@ -1,11 +1,11 @@
 
 /* pngtest.c - a simple test program to test libpng
  *
- * libpng 1.0.7beta13 - May 16, 2000
+ * libpng 1.2.1beta3 - October 27, 2001
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2001 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.)
  *
  * This program reads in a PNG image, writes it out again, and then
  * compares the two files.  If the files are identical, this shows that
@@ -16,7 +16,8 @@
  * The program will report "FAIL" in certain legitimate cases:
  * 1) when the compression level or filter selection method is changed.
  * 2) when the maximum IDAT size (PNG_ZBUF_SIZE in pngconf.h) is not 8192.
- * 3) unknown ancillary chunks exist in the input file.
+ * 3) unknown unsafe-to-copy ancillary chunks or unknown critical chunks
+ *    exist in the input file.
  * 4) others not listed here...
  * In these cases, it is best to check with another tool such as "pngcheck"
  * to see what the differences between the two files are.
@@ -27,13 +28,43 @@
  * of files at once by typing "pngtest -m file1.png file2.png ..."
  */
 
-#include <stdio.h>
-#include <stdlib.h>
-#include <assert.h>
+#if defined(_WIN32_WCE)
+#  if _WIN32_WCE < 211
+     __error__ (f|w)printf functions are not supported on old WindowsCE.;
+#  endif
+#  include <windows.h>
+#  include <stdlib.h>
+#  define READFILE(file, data, length, check) \
+     if (ReadFile(file, data, length, &check,NULL)) check = 0
+#  define WRITEFILE(file, data, length, check)) \
+     if (WriteFile(file, data, length, &check, NULL)) check = 0
+#  define FCLOSE(file) CloseHandle(file)
+#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) \
+     check=(png_size_t)fwrite(data,(png_size_t)1, length, file)
+#  define FCLOSE(file) fclose(file)
+#endif
+
+#if defined(PNG_NO_STDIO)
+#  if defined(_WIN32_WCE)
+     typedef HANDLE                png_FILE_p;
+#  else
+     typedef FILE                * png_FILE_p;
+#  endif
+#endif
 
 /* Makes pngtest verbose so we can find problems (needs to be before png.h) */
 #ifndef PNG_DEBUG
-#define PNG_DEBUG 0
+#  define PNG_DEBUG 0
+#endif
+
+#if !PNG_DEBUG
+#  define SINGLE_ROWBUF_ALLOC	/* makes buffer overruns easier to nail */
 #endif
 
 /* Turn on CPU timing
@@ -85,6 +116,8 @@ static int status_pass=1;
 static int status_dots_requested=0;
 static int status_dots=1;
 
+void
+read_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass);
 void
 read_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
 {
@@ -104,6 +137,8 @@ read_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
     fprintf(stdout, "r");
 }
 
+void
+write_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass);
 void
 write_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
 {
@@ -118,6 +153,8 @@ write_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
    5 in case illegal filter values are present.) */
 static png_uint_32 filters_used[256];
 void
+count_filters(png_structp png_ptr, png_row_infop row_info, png_bytep data);
+void
 count_filters(png_structp png_ptr, png_row_infop row_info, png_bytep data)
 {
     if(png_ptr != NULL && row_info != NULL)
@@ -131,6 +168,8 @@ count_filters(png_structp png_ptr, png_row_infop row_info, png_bytep data)
 
 static png_uint_32 zero_samples;
 
+void
+count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data);
 void
 count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
 {
@@ -230,21 +269,21 @@ static int wrote_question = 0;
    not reading from a standard C stream, you should create a replacement
    read_data function and use it at run time with png_set_read_fn(), rather
    than changing the library. */
+
 #ifndef USE_FAR_KEYWORD
 static void
-png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
+pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    png_size_t check;
 
    /* 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.
     */
-   check = (png_size_t)fread(data, (png_size_t)1, length,
-      (FILE *)png_ptr->io_ptr);
+   READFILE((png_FILE_p)png_ptr->io_ptr, data, length, check);
 
    if (check != length)
    {
-      png_error(png_ptr, "Read Error");
+      png_error(png_ptr, "Read Error!");
    }
 }
 #else
@@ -257,18 +296,18 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 #define MIN(a,b) (a <= b ? a : b)
 
 static void
-png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
+pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    int check;
    png_byte *n_data;
-   FILE *io_ptr;
+   png_FILE_p io_ptr;
 
    /* Check if data really is near. If so, use usual code. */
    n_data = (png_byte *)CVT_PTR_NOCHECK(data);
-   io_ptr = (FILE *)CVT_PTR(png_ptr->io_ptr);
+   io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
    if ((png_bytep)n_data == data)
    {
-      check = fread(n_data, 1, length, io_ptr);
+      READFILE(io_ptr, n_data, length, check);
    }
    else
    {
@@ -279,7 +318,7 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
       do
       {
          read = MIN(NEAR_BUF_SIZE, remaining);
-         err = fread(buf, (png_size_t)1, read, io_ptr);
+         READFILE(io_ptr, buf, 1, err);
          png_memcpy(data, buf, read); /* copy far buffer to near buffer */
          if(err != read)
             break;
@@ -299,12 +338,14 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 
 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
 static void
-png_default_flush(png_structp png_ptr)
+pngtest_flush(png_structp png_ptr)
 {
-   FILE *io_ptr;
-   io_ptr = (FILE *)CVT_PTR((png_ptr->io_ptr));
+#if !defined(_WIN32_WCE)
+   png_FILE_p io_ptr;
+   io_ptr = (png_FILE_p)CVT_PTR((png_ptr->io_ptr));
    if (io_ptr != NULL)
       fflush(io_ptr);
+#endif
 }
 #endif
 
@@ -314,11 +355,11 @@ png_default_flush(png_structp png_ptr)
    than changing the library. */
 #ifndef USE_FAR_KEYWORD
 static void
-png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
+pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    png_uint_32 check;
 
-   check = fwrite(data, 1, length, (FILE *)(png_ptr->io_ptr));
+   WRITEFILE((png_FILE_p)png_ptr->io_ptr,  data, length, check);
    if (check != length)
    {
       png_error(png_ptr, "Write Error");
@@ -334,18 +375,18 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 #define MIN(a,b) (a <= b ? a : b)
 
 static void
-png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
+pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    png_uint_32 check;
    png_byte *near_data;  /* Needs to be "png_byte *" instead of "png_bytep" */
-   FILE *io_ptr;
+   png_FILE_p io_ptr;
 
    /* Check if data really is near. If so, use usual code. */
    near_data = (png_byte *)CVT_PTR_NOCHECK(data);
-   io_ptr = (FILE *)CVT_PTR(png_ptr->io_ptr);
+   io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
    if ((png_bytep)near_data == data)
    {
-      check = fwrite(near_data, 1, length, io_ptr);
+      WRITEFILE(io_ptr, near_data, length, check);
    }
    else
    {
@@ -357,7 +398,7 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
       {
          written = MIN(NEAR_BUF_SIZE, remaining);
          png_memcpy(buf, data, written); /* copy far buffer to near buffer */
-         err = fwrite(buf, 1, written, io_ptr);
+         WRITEFILE(io_ptr, buf, written, err);
          if (err != written)
             break;
          else
@@ -381,7 +422,7 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
  * not used, but it is passed in case it may be useful.
  */
 static void
-png_default_warning(png_structp png_ptr, png_const_charp message)
+pngtest_warning(png_structp png_ptr, png_const_charp message)
 {
    PNG_CONST char *name = "UNKNOWN (ERROR!)";
    if (png_ptr != NULL && png_ptr->error_ptr != NULL)
@@ -395,9 +436,9 @@ png_default_warning(png_structp png_ptr, png_const_charp message)
  * error function pointer in png_set_error_fn().
  */
 static void
-png_default_error(png_structp png_ptr, png_const_charp message)
+pngtest_error(png_structp png_ptr, png_const_charp message)
 {
-   png_default_warning(png_ptr, message);
+   pngtest_warning(png_ptr, message);
    /* We can return because png_error calls the default handler, which is
     * actually OK in this case. */
 }
@@ -417,7 +458,7 @@ png_default_error(png_structp png_ptr, png_const_charp message)
    by setting MAXSEG_64K in zlib zconf.h *or* PNG_MAX_MALLOC_64K. */
 typedef struct memory_information
 {
-   png_uint_32                    size;
+   png_uint_32               size;
    png_voidp                 pointer;
    struct memory_information FAR *next;
 } memory_information;
@@ -426,11 +467,11 @@ typedef memory_information FAR *memory_infop;
 static memory_infop pinformation = NULL;
 static int current_allocation = 0;
 static int maximum_allocation = 0;
+static int total_allocation = 0;
+static int num_allocations = 0;
 
-extern PNG_EXPORT(png_voidp,png_debug_malloc) PNGARG((png_structp png_ptr,
-   png_uint_32 size));
-extern PNG_EXPORT(void,png_debug_free) PNGARG((png_structp png_ptr,
-   png_voidp ptr));
+png_voidp png_debug_malloc PNGARG((png_structp png_ptr, png_uint_32 size));
+void png_debug_free PNGARG((png_structp png_ptr, png_voidp ptr));
 
 png_voidp
 png_debug_malloc(png_structp png_ptr, png_uint_32 size)
@@ -440,26 +481,29 @@ png_debug_malloc(png_structp png_ptr, png_uint_32 size)
       png_debug_malloc directly, with png_ptr == NULL which is OK */
 
    if (size == 0)
-      return (png_voidp)(NULL);
+      return (NULL);
 
    /* This calls the library allocator twice, once to get the requested
       buffer and once to get a new free list entry. */
    {
-      memory_infop pinfo = png_malloc_default(png_ptr, sizeof *pinfo);
+      memory_infop pinfo = (memory_infop)png_malloc_default(png_ptr,
+         (png_uint_32)sizeof *pinfo);
       pinfo->size = size;
       current_allocation += size;
+      total_allocation += size;
+      num_allocations ++;
       if (current_allocation > maximum_allocation)
          maximum_allocation = current_allocation;
-      pinfo->pointer = png_malloc_default(png_ptr, size);
+      pinfo->pointer = (png_voidp)png_malloc_default(png_ptr, size);
       pinfo->next = pinformation;
       pinformation = pinfo;
       /* Make sure the caller isn't assuming zeroed memory. */
       png_memset(pinfo->pointer, 0xdd, pinfo->size);
 #if PNG_DEBUG
       if(verbose)
-         printf("png_malloc %d bytes at %x\n",size,pinfo->pointer);
+         printf("png_malloc %lu bytes at %x\n",size,pinfo->pointer);
 #endif
-      assert(pinfo->size != 12345);
+      assert(pinfo->size != 12345678);
       return (png_voidp)(pinfo->pointer);
    }
 }
@@ -492,13 +536,14 @@ png_debug_free(png_structp png_ptr, png_voidp ptr)
                fprintf(STDERR, "Duplicate free of memory\n");
             /* We must free the list element too, but first kill
                the memory that is to be freed. */
-            memset(ptr, 0x55, pinfo->size);
+            png_memset(ptr, 0x55, pinfo->size);
             png_free_default(png_ptr, pinfo);
+            pinfo=NULL;
             break;
          }
          if (pinfo->next == NULL)
          {
-            fprintf(STDERR, "Pointer %x not found\n", ptr);
+            fprintf(STDERR, "Pointer %x not found\n", (unsigned int)ptr);
             break;
          }
          ppinfo = &pinfo->next;
@@ -511,6 +556,7 @@ png_debug_free(png_structp png_ptr, png_voidp ptr)
       printf("Freeing %x\n",ptr);
 #endif
    png_free_default(png_ptr, ptr);
+   ptr=NULL;
 }
 #endif /* PNG_USER_MEM_SUPPORTED */
 /* END of code to test memory allocation/deallocation */
@@ -519,9 +565,19 @@ png_debug_free(png_structp png_ptr, png_voidp ptr)
 int
 test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 {
-   static FILE *fpin, *fpout;  /* "static" prevents setjmp corruption */
-   png_structp read_ptr, write_ptr;
-   png_infop read_info_ptr, write_info_ptr, end_info_ptr, write_end_info_ptr;
+   static png_FILE_p fpin;
+   static png_FILE_p fpout;  /* "static" prevents setjmp corruption */
+   png_structp read_ptr;
+   png_infop read_info_ptr, end_info_ptr;
+#ifdef PNG_WRITE_SUPPORTED
+   png_structp write_ptr;
+   png_infop write_info_ptr;
+   png_infop write_end_info_ptr;
+#else
+   png_structp write_ptr = NULL;
+   png_infop write_info_ptr = NULL;
+   png_infop write_end_info_ptr = NULL;
+#endif
    png_bytep row_buf;
    png_uint_32 y;
    png_uint_32 width, height;
@@ -533,54 +589,69 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #endif
 #endif
 
+#if defined(_WIN32_WCE)
+   TCHAR path[MAX_PATH];
+#endif
    char inbuf[256], outbuf[256];
 
-   row_buf = (png_bytep)NULL;
+   row_buf = NULL;
 
+#if defined(_WIN32_WCE)
+   MultiByteToWideChar(CP_ACP, 0, inname, -1, path, MAX_PATH);
+   if ((fpin = CreateFile(path, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL)) == INVALID_HANDLE_VALUE)
+#else
    if ((fpin = fopen(inname, "rb")) == NULL)
+#endif
    {
       fprintf(STDERR, "Could not find input file %s\n", inname);
       return (1);
    }
 
+#if defined(_WIN32_WCE)
+   MultiByteToWideChar(CP_ACP, 0, outname, -1, path, MAX_PATH);
+   if ((fpout = CreateFile(path, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, 0, NULL)) == INVALID_HANDLE_VALUE)
+#else
    if ((fpout = fopen(outname, "wb")) == NULL)
+#endif
    {
       fprintf(STDERR, "Could not open output file %s\n", outname);
-      fclose(fpin);
+      FCLOSE(fpin);
       return (1);
    }
 
    png_debug(0, "Allocating read and write structures\n");
 #ifdef PNG_USER_MEM_SUPPORTED
-   read_ptr = png_create_read_struct_2(PNG_LIBPNG_VER_STRING, (png_voidp)NULL,
-      (png_error_ptr)NULL, (png_error_ptr)NULL, (png_voidp)NULL,
+   read_ptr = png_create_read_struct_2(PNG_LIBPNG_VER_STRING, png_voidp_NULL,
+      png_error_ptr_NULL, png_error_ptr_NULL, png_voidp_NULL,
       (png_malloc_ptr)png_debug_malloc, (png_free_ptr)png_debug_free);
 #else
-   read_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, (png_voidp)NULL,
-      (png_error_ptr)NULL, (png_error_ptr)NULL);
+   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, png_default_error,
-       png_default_warning);
+   png_set_error_fn(read_ptr, (png_voidp)inname, pngtest_error,
+       pngtest_warning);
 #endif
+#ifdef PNG_WRITE_SUPPORTED
 #ifdef PNG_USER_MEM_SUPPORTED
-   write_ptr = png_create_write_struct_2(PNG_LIBPNG_VER_STRING, (png_voidp)NULL,
-      (png_error_ptr)NULL, (png_error_ptr)NULL, (png_voidp)NULL,
+   write_ptr = png_create_write_struct_2(PNG_LIBPNG_VER_STRING, png_voidp_NULL,
+      png_error_ptr_NULL, png_error_ptr_NULL, png_voidp_NULL,
       (png_malloc_ptr)png_debug_malloc, (png_free_ptr)png_debug_free);
 #else
-   write_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, (png_voidp)NULL,
-      (png_error_ptr)NULL, (png_error_ptr)NULL);
+   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, png_default_error,
-       png_default_warning);
+   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);
-   write_info_ptr = png_create_info_struct(write_ptr);
    end_info_ptr = png_create_info_struct(read_ptr);
+#ifdef PNG_WRITE_SUPPORTED
+   write_info_ptr = png_create_info_struct(write_ptr);
    write_end_info_ptr = png_create_info_struct(write_ptr);
-#ifdef PNG_USER_MEM_SUPPORTED
 #endif
 
 #ifdef PNG_SETJMP_SUPPORTED
@@ -593,16 +664,19 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
    {
       fprintf(STDERR, "%s -> %s: libpng read error\n", inname, outname);
       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);
       png_destroy_write_struct(&write_ptr, &write_info_ptr);
-      fclose(fpin);
-      fclose(fpout);
+#endif
+      FCLOSE(fpin);
+      FCLOSE(fpout);
       return (1);
    }
 #ifdef USE_FAR_KEYWORD
    png_memcpy(png_jmpbuf(read_ptr),jmpbuf,sizeof(jmp_buf));
 #endif
 
+#ifdef PNG_WRITE_SUPPORTED
    png_debug(0, "Setting jmpbuf for write struct\n");
 #ifdef USE_FAR_KEYWORD
    if (setjmp(jmpbuf))
@@ -613,38 +687,49 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
       fprintf(STDERR, "%s -> %s: libpng write error\n", inname, outname);
       png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
       png_destroy_info_struct(write_ptr, &write_end_info_ptr);
+#ifdef PNG_WRITE_SUPPORTED
       png_destroy_write_struct(&write_ptr, &write_info_ptr);
-      fclose(fpin);
-      fclose(fpout);
+#endif
+      FCLOSE(fpin);
+      FCLOSE(fpout);
       return (1);
    }
 #ifdef USE_FAR_KEYWORD
    png_memcpy(png_jmpbuf(write_ptr),jmpbuf,sizeof(jmp_buf));
 #endif
+#endif
 #endif
 
    png_debug(0, "Initializing input and output streams\n");
 #if !defined(PNG_NO_STDIO)
    png_init_io(read_ptr, fpin);
+#  ifdef PNG_WRITE_SUPPORTED
    png_init_io(write_ptr, fpout);
+#  endif
 #else
-   png_set_read_fn(read_ptr, (png_voidp)fpin, png_default_read_data);
-   png_set_write_fn(write_ptr, (png_voidp)fpout,  png_default_write_data,
-#if defined(PNG_WRITE_FLUSH_SUPPORTED)
-      png_default_flush);
-#else
+   png_set_read_fn(read_ptr, (png_voidp)fpin, pngtest_read_data);
+#  ifdef PNG_WRITE_SUPPORTED
+   png_set_write_fn(write_ptr, (png_voidp)fpout,  pngtest_write_data,
+#    if defined(PNG_WRITE_FLUSH_SUPPORTED)
+      pngtest_flush);
+#    else
       NULL);
-#endif
+#    endif
+#  endif
 #endif
    if(status_dots_requested == 1)
    {
+#ifdef PNG_WRITE_SUPPORTED
       png_set_write_status_fn(write_ptr, write_row_callback);
+#endif
       png_set_read_status_fn(read_ptr, read_row_callback);
    }
    else
    {
-      png_set_write_status_fn(write_ptr, NULL);
-      png_set_read_status_fn(read_ptr, NULL);
+#ifdef PNG_WRITE_SUPPORTED
+      png_set_write_status_fn(write_ptr, png_write_status_ptr_NULL);
+#endif
+      png_set_read_status_fn(read_ptr, png_read_status_ptr_NULL);
    }
 
 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
@@ -663,10 +748,12 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #define HANDLE_CHUNK_IF_SAFE      2
 #define HANDLE_CHUNK_ALWAYS       3
 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
-   png_set_keep_unknown_chunks(read_ptr, HANDLE_CHUNK_ALWAYS, NULL, 0);
+   png_set_keep_unknown_chunks(read_ptr, HANDLE_CHUNK_ALWAYS,
+      png_bytep_NULL, 0);
 #endif
 #if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
-   png_set_keep_unknown_chunks(write_ptr, HANDLE_CHUNK_IF_SAFE, NULL, 0);
+   png_set_keep_unknown_chunks(write_ptr, HANDLE_CHUNK_IF_SAFE,
+      png_bytep_NULL, 0);
 #endif
 
    png_debug(0, "Reading info struct\n");
@@ -841,22 +928,24 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #ifdef PNG_FLOATING_POINT_SUPPORTED
    {
       int unit;
-      double width, height;
+      double scal_width, scal_height;
 
-      if (png_get_sCAL(read_ptr, read_info_ptr, &unit, &width, &height))
+      if (png_get_sCAL(read_ptr, read_info_ptr, &unit, &scal_width,
+         &scal_height))
       {
-         png_set_sCAL(write_ptr, write_info_ptr, unit, width, height);
+         png_set_sCAL(write_ptr, write_info_ptr, unit, scal_width, scal_height);
       }
    }
 #else
 #ifdef PNG_FIXED_POINT_SUPPORTED
    {
       int unit;
-      png_charp width, height;
+      png_charp scal_width, scal_height;
 
-      if (png_get_sCAL_s(read_ptr, read_info_ptr, &unit, &width, &height))
+      if (png_get_sCAL_s(read_ptr, read_info_ptr, &unit, &scal_width,
+          &scal_height))
       {
-         png_set_sCAL_s(write_ptr, write_info_ptr, unit, width, height);
+         png_set_sCAL_s(write_ptr, write_info_ptr, unit, scal_width, scal_height);
       }
    }
 #endif
@@ -925,32 +1014,29 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
    }
 #endif
 
+#ifdef PNG_WRITE_SUPPORTED
    png_debug(0, "\nWriting info struct\n");
 
 /* If we wanted, we could write info in two steps:
    png_write_info_before_PLTE(write_ptr, write_info_ptr);
  */
    png_write_info(write_ptr, write_info_ptr);
+#endif
 
-   png_debug(0, "\nAllocating row buffer \n");
+#ifdef SINGLE_ROWBUF_ALLOC
+   png_debug(0, "\nAllocating row buffer...");
    row_buf = (png_bytep)png_malloc(read_ptr,
       png_get_rowbytes(read_ptr, read_info_ptr));
-   if (row_buf == NULL)
-   {
-      fprintf(STDERR, "No memory to allocate row buffer\n");
-      png_destroy_read_struct(&read_ptr, &read_info_ptr, (png_infopp)NULL);
-      png_destroy_info_struct(write_ptr, &write_end_info_ptr);
-      png_destroy_write_struct(&write_ptr, &write_info_ptr);
-      fclose(fpin);
-      fclose(fpout);
-      return (1);
-   }
+   png_debug1(0, "0x%08lx\n\n", (unsigned long)row_buf);
+#endif /* SINGLE_ROWBUF_ALLOC */
    png_debug(0, "Writing row data\n");
 
 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \
   defined(PNG_WRITE_INTERLACING_SUPPORTED)
    num_pass = png_set_interlace_handling(read_ptr);
+#  ifdef PNG_WRITE_SUPPORTED
    png_set_interlace_handling(write_ptr);
+#  endif
 #else
    num_pass=1;
 #endif
@@ -965,7 +1051,16 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
       png_debug1(0, "Writing row data for pass %d\n",pass);
       for (y = 0; y < height; y++)
       {
-         png_read_rows(read_ptr, (png_bytepp)&row_buf, (png_bytepp)NULL, 1);
+#ifndef SINGLE_ROWBUF_ALLOC
+         png_debug2(0, "\nAllocating row buffer (pass %d, y = %ld)...", pass,y);
+         row_buf = (png_bytep)png_malloc(read_ptr,
+            png_get_rowbytes(read_ptr, read_info_ptr));
+         png_debug2(0, "0x%08lx (%ld bytes)\n", (unsigned long)row_buf,
+            png_get_rowbytes(read_ptr, read_info_ptr));
+#endif /* !SINGLE_ROWBUF_ALLOC */
+         png_read_rows(read_ptr, (png_bytepp)&row_buf, png_bytepp_NULL, 1);
+
+#ifdef PNG_WRITE_SUPPORTED
 #ifdef PNGTEST_TIMING
          t_stop = (float)clock();
          t_decode += (t_stop - t_start);
@@ -977,6 +1072,12 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
          t_encode += (t_stop - t_start);
          t_start = t_stop;
 #endif
+#endif /* PNG_WRITE_SUPPORTED */
+
+#ifndef SINGLE_ROWBUF_ALLOC
+         png_debug2(0, "Freeing row buffer (pass %d, y = %ld)\n\n", pass, y);
+         png_free(read_ptr, row_buf);
+#endif /* !SINGLE_ROWBUF_ALLOC */
       }
    }
 
@@ -1039,7 +1140,9 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
       }
    }
 #endif
+#ifdef PNG_WRITE_SUPPORTED
    png_write_end(write_ptr, write_end_info_ptr);
+#endif
 
 #ifdef PNG_EASY_ACCESS_SUPPORTED
    if(verbose)
@@ -1053,25 +1156,45 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #endif
 
    png_debug(0, "Destroying data structs\n");
+#ifdef SINGLE_ROWBUF_ALLOC
+   png_debug(1, "destroying row_buf for read_ptr\n");
    png_free(read_ptr, row_buf);
+   row_buf=NULL;
+#endif /* SINGLE_ROWBUF_ALLOC */
+   png_debug(1, "destroying read_ptr, read_info_ptr, end_info_ptr\n");
    png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
+#ifdef PNG_WRITE_SUPPORTED
+   png_debug(1, "destroying write_end_info_ptr\n");
    png_destroy_info_struct(write_ptr, &write_end_info_ptr);
+   png_debug(1, "destroying write_ptr, write_info_ptr\n");
    png_destroy_write_struct(&write_ptr, &write_info_ptr);
+#endif
+   png_debug(0, "Destruction complete.\n");
 
-   fclose(fpin);
-   fclose(fpout);
+   FCLOSE(fpin);
+   FCLOSE(fpout);
 
    png_debug(0, "Opening files for comparison\n");
+#if defined(_WIN32_WCE)
+   MultiByteToWideChar(CP_ACP, 0, inname, -1, path, MAX_PATH);
+   if ((fpin = CreateFile(path, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL)) == INVALID_HANDLE_VALUE)
+#else
    if ((fpin = fopen(inname, "rb")) == NULL)
+#endif
    {
       fprintf(STDERR, "Could not find file %s\n", inname);
       return (1);
    }
 
+#if defined(_WIN32_WCE)
+   MultiByteToWideChar(CP_ACP, 0, outname, -1, path, MAX_PATH);
+   if ((fpout = CreateFile(path, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL)) == INVALID_HANDLE_VALUE)
+#else
    if ((fpout = fopen(outname, "rb")) == NULL)
+#endif
    {
       fprintf(STDERR, "Could not find file %s\n", outname);
-      fclose(fpin);
+      FCLOSE(fpin);
       return (1);
    }
 
@@ -1079,8 +1202,8 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
    {
       png_size_t num_in, num_out;
 
-      num_in = fread(inbuf, 1, 1, fpin);
-      num_out = fread(outbuf, 1, 1, fpout);
+      READFILE(fpin, inbuf, 1, num_in);
+      READFILE(fpout, outbuf, 1, num_out);
 
       if (num_in != num_out)
       {
@@ -1098,8 +1221,8 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
               ZLIB_VERSION);
             wrote_question=1;
          }
-         fclose(fpin);
-         fclose(fpout);
+         FCLOSE(fpin);
+         FCLOSE(fpout);
          return (0);
       }
 
@@ -1121,14 +1244,14 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
               ZLIB_VERSION);
             wrote_question=1;
          }
-         fclose(fpin);
-         fclose(fpout);
+         FCLOSE(fpin);
+         FCLOSE(fpout);
          return (0);
       }
    }
 
-   fclose(fpin);
-   fclose(fpout);
+   FCLOSE(fpin);
+   FCLOSE(fpout);
 
    return (0);
 }
@@ -1155,10 +1278,10 @@ main(int argc, char *argv[])
    fprintf(STDERR," library (%lu):%s", png_access_version_number(),
       png_get_header_version(NULL));
    /* Show the version of libpng used in building the application */
-   fprintf(STDERR," pngtest (%lu):%s", PNG_LIBPNG_VER,
+   fprintf(STDERR," pngtest (%lu):%s", (unsigned long)PNG_LIBPNG_VER,
       PNG_HEADER_VERSION_STRING);
-   fprintf(STDERR," sizeof(png_struct)=%d, sizeof(png_info)=%d\n",
-                    sizeof(png_struct), sizeof(png_info));
+   fprintf(STDERR," sizeof(png_struct)=%ld, sizeof(png_info)=%ld\n",
+                    (long)sizeof(png_struct), (long)sizeof(png_info));
 
    /* Do some consistency checking on the memory allocation settings, I'm
       not sure this matters, but it is nice to know, the first of these
@@ -1273,17 +1396,22 @@ main(int argc, char *argv[])
                current_allocation);
             while (pinfo != NULL)
             {
-               fprintf(STDERR, " %d bytes at %x\n", pinfo->size, pinfo->pointer);
+               fprintf(STDERR, " %lu bytes at %x\n", pinfo->size, 
+                 (unsigned int) pinfo->pointer);
                pinfo = pinfo->next;
             }
          }
 #endif
       }
 #ifdef PNG_USER_MEM_SUPPORTED
-         fprintf(STDERR, " Current memory allocation: %d bytes\n",
+         fprintf(STDERR, " Current memory allocation: %10d bytes\n",
             current_allocation);
-         fprintf(STDERR, " Maximum memory allocation: %d bytes\n",
+         fprintf(STDERR, " Maximum memory allocation: %10d bytes\n",
             maximum_allocation);
+         fprintf(STDERR, " Total   memory allocation: %10d bytes\n",
+            total_allocation);
+         fprintf(STDERR, "     Number of allocations: %10d\n",
+            num_allocations);
 #endif
    }
    else
@@ -1343,18 +1471,22 @@ main(int argc, char *argv[])
                 current_allocation);
              while (pinfo != NULL)
              {
-                fprintf(STDERR," %d bytes at %x\n",
-                   pinfo->size, pinfo->pointer);
+                fprintf(STDERR," %lu bytes at %x\n",
+                   pinfo->size, (unsigned int)pinfo->pointer);
                 pinfo = pinfo->next;
              }
           }
 #endif
        }
 #ifdef PNG_USER_MEM_SUPPORTED
-       fprintf(STDERR, " Current memory allocation: %d bytes\n",
+       fprintf(STDERR, " Current memory allocation: %10d bytes\n",
           current_allocation);
-       fprintf(STDERR, " Maximum memory allocation: %d bytes\n",
+       fprintf(STDERR, " Maximum memory allocation: %10d bytes\n",
           maximum_allocation);
+       fprintf(STDERR, " Total   memory allocation: %10d bytes\n",
+          total_allocation);
+       fprintf(STDERR, "     Number of allocations: %10d\n",
+            num_allocations);
 #endif
    }
 
@@ -1380,4 +1512,4 @@ main(int argc, char *argv[])
 }
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_0_7beta13 your_png_h_is_not_version_1_0_7beta13;
+typedef version_1_2_1beta3 your_png_h_is_not_version_1_2_1beta3;

pngtrans.c

@@ -1,11 +1,11 @@
 
 /* pngtrans.c - transforms the data in a row (used by both readers and writers)
  *
- * libpng 1.0.7beta13 - May 16, 2000
+ * libpng 1.2.1beta3 - October 27, 2001
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2001 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.)
  */
 
 #define PNG_INTERNAL
@@ -153,11 +153,14 @@ void /* PRIVATE */
 png_do_invert(png_row_infop row_info, png_bytep row)
 {
    png_debug(1, "in png_do_invert\n");
-   if (row_info->bit_depth == 1 &&
+  /* This test removed from libpng version 1.0.13 and 1.2.0:
+   *   if (row_info->bit_depth == 1 &&
+   */
 #if defined(PNG_USELESS_TESTS_SUPPORTED)
-       row != NULL && row_info != NULL &&
+   if (row == NULL || row_info == NULL)
+     return;
 #endif
-       row_info->color_type == PNG_COLOR_TYPE_GRAY)
+   if (row_info->color_type == PNG_COLOR_TYPE_GRAY)
    {
       png_bytep rp = row;
       png_uint_32 i;
@@ -169,6 +172,33 @@ png_do_invert(png_row_infop row_info, png_bytep row)
          rp++;
       }
    }
+   else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
+      row_info->bit_depth == 8)
+   {
+      png_bytep rp = row;
+      png_uint_32 i;
+      png_uint_32 istop = row_info->rowbytes;
+
+      for (i = 0; i < istop; i+=2)
+      {
+         *rp = (png_byte)(~(*rp));
+         rp+=2;
+      }
+   }
+   else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
+      row_info->bit_depth == 16)
+   {
+      png_bytep rp = row;
+      png_uint_32 i;
+      png_uint_32 istop = row_info->rowbytes;
+
+      for (i = 0; i < istop; i+=4)
+      {
+         *rp = (png_byte)(~(*rp));
+         *(rp+1) = (png_byte)(~(*(rp+1)));
+         rp+=4;
+      }
+   }
 }
 #endif
 
@@ -392,11 +422,12 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
                sp += 8; dp += 6;
                for (i = 1; i < row_width; i++)
                {
-                  /* This could be (although memcpy is probably slower):
+                  /* This could be (although png_memcpy is probably slower):
                   png_memcpy(dp, sp, 6);
                   sp += 8;
                   dp += 6;
                   */
+
                   *dp++ = *sp++;
                   *dp++ = *sp++;
                   *dp++ = *sp++;
@@ -411,11 +442,12 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
                /* This converts from XXRRGGBB or AARRGGBB to RRGGBB */
                for (i = 0; i < row_width; i++)
                {
-                  /* This could be (although memcpy is probably slower):
+                  /* This could be (although png_memcpy is probably slower):
                   png_memcpy(dp, sp, 6);
                   sp += 8;
                   dp += 6;
                   */
+
                   sp+=2;
                   *dp++ = *sp++;
                   *dp++ = *sp++;

pngvcrd.c

@@ -2,14 +2,25 @@
  *
  * For Intel x86 CPU and Microsoft Visual C++ compiler
  *
- * libpng 1.0.7beta13 - May 16, 2000
+ * libpng 1.2.1beta3 - October 27, 2001
  * For conditions of distribution and use, see copyright notice in png.h
+ * Copyright (c) 1998-2001 Glenn Randers-Pehrson
  * Copyright (c) 1998, Intel Corporation
- * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  *
  * Contributed by Nirav Chhatrapati, Intel Corporation, 1998
  * Interface to libpng contributed by Gilles Vollant, 1999
  *
+ *
+ * In png_do_read_interlace() in libpng versions 1.0.3a through 1.0.4d,
+ * a sign error in the post-MMX cleanup code for each pixel_depth resulted
+ * in bad pixels at the beginning of some rows of some images, and also
+ * (due to out-of-range memory reads and writes) caused heap corruption
+ * when compiled with MSVC 6.0.  The error was fixed in version 1.0.4e.
+ *
+ * [png_read_filter_row_mmx_avg() bpp == 2 bugfix, GRR 20000916]
+ *
+ * [runtime MMX configuration, GRR 20010102]
+ *
  */
 
 #define PNG_INTERNAL
@@ -17,19 +28,11 @@
 
 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) && defined(PNG_USE_PNGVCRD)
 
-/*
-   One of these might need to be defined.
-#define DISABLE_PNGVCRD_COMBINE
-#define DISABLE_PNGVCRD_INTERLACE
-*/
-
 static int mmx_supported=2;
 
-void /* PRIVATE */
-png_read_filter_row_c(png_structp png_ptr, png_row_infop row_info,
-   png_bytep row, png_bytep prev_row, int filter);
 
-static int mmxsupport()
+int PNGAPI
+png_mmx_support(void)
 {
   int mmx_supported_local = 0;
   _asm {
@@ -81,6 +84,7 @@ NOT_SUPPORTED:
   //mmx_supported_local=0; // test code for force don't support MMX
   //printf("MMX : %u (1=MMX supported)\n",mmx_supported_local);
 
+  mmx_supported = mmx_supported_local;
   return mmx_supported_local;
 }
 
@@ -104,19 +108,14 @@ png_combine_row(png_structp png_ptr, png_bytep row, int mask)
 #ifdef PNG_USE_LOCAL_ARRAYS
    const int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
 #endif
-#ifdef DISABLE_PNGVCRD_COMBINE
-   int save_mmx_supported = mmx_supported;
-#endif
 
    png_debug(1,"in png_combine_row_asm\n");
 
-#ifdef DISABLE_PNGVCRD_COMBINE
-   if ((png_ptr->transformations & PNG_INTERLACE) && png_ptr->pass != 6)
-       mmx_supported = 0;
-   else
-#endif
-       if (mmx_supported == 2)
-           mmx_supported = mmxsupport();
+   if (mmx_supported == 2) {
+       /* this should have happened in png_init_mmx_flags() already */
+       png_warning(png_ptr, "asm_flags may not have been initialized");
+       png_mmx_support();
+   }
 
    if (mask == 0xff)
    {
@@ -305,7 +304,8 @@ png_combine_row(png_structp png_ptr, png_bytep row, int mask)
 
             __int64 mask0=0x0102040810204080;
 
-            if (mmx_supported)
+            if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_COMBINE_ROW)
+                /* && mmx_supported */ )
             {
                srcptr = png_ptr->row_buf + 1;
                dstptr = row;
@@ -405,7 +405,8 @@ end8:
             __int64 mask1=0x0101020204040808,
                     mask0=0x1010202040408080;
 
-            if (mmx_supported)
+            if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_COMBINE_ROW)
+                /* && mmx_supported */ )
             {
                srcptr = png_ptr->row_buf + 1;
                dstptr = row;
@@ -525,7 +526,8 @@ end16:
             len     = (png_ptr->width)&~7;
             diff = (png_ptr->width)&7;
 
-            if (mmx_supported)
+            if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_COMBINE_ROW)
+                /* && mmx_supported */ )
             {
                _asm
                {
@@ -656,7 +658,8 @@ end24:
             len     = (png_ptr->width)&~7;
             diff = (png_ptr->width)&7;
 
-            if (mmx_supported)
+            if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_COMBINE_ROW)
+                /* && mmx_supported */ )
             {
                _asm
                {
@@ -790,7 +793,8 @@ end32:
                     mask1=0x2020202040404040,
                     mask0=0x4040808080808080;
 
-            if (mmx_supported)
+            if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_COMBINE_ROW)
+                /* && mmx_supported */ )
             {
                srcptr = png_ptr->row_buf + 1;
                dstptr = row;
@@ -961,43 +965,29 @@ end48:
       } /* end switch (png_ptr->row_info.pixel_depth) */
    } /* end if (non-trivial mask) */
 
-#ifdef DISABLE_PNGVCRD_COMBINE
-   mmx_supported = save_mmx_supported;
-#endif
-
 } /* end png_combine_row() */
 
 
 #if defined(PNG_READ_INTERLACING_SUPPORTED)
 
 void /* PRIVATE */
-png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
-   png_uint_32 transformations)
+png_do_read_interlace(png_structp png_ptr)
 {
+   png_row_infop row_info = &(png_ptr->row_info);
+   png_bytep row = png_ptr->row_buf + 1;
+   int pass = png_ptr->pass;
+   png_uint_32 transformations = png_ptr->transformations;
 #ifdef PNG_USE_LOCAL_ARRAYS
    const int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
 #endif
-#ifdef DISABLE_PNGVCRD_INTERLACE
-   int save_mmx_supported = mmx_supported;
-#endif
 
    png_debug(1,"in png_do_read_interlace\n");
 
-#ifdef DISABLE_PNGVCRD_INTERLACE
-   /* In libpng versions 1.0.3a through 1.0.4d,
-    * a sign error in the post-MMX cleanup code for each pixel_depth resulted
-    * in bad pixels at the beginning of some rows of some images, and also
-    * (due to out-of-range memory reads and writes) caused heap corruption
-    * when compiled with MSVC 6.0.  The error was fixed in version 1.0.4e,
-    * and the code appears to work completely correctly, so it is enabled
-    * by default.
-    */
-   if (1)  /* all passes caused a heap problem in the old code */
-      mmx_supported = 0;
-   else
-#endif
-       if (mmx_supported == 2)
-           mmx_supported = mmxsupport();
+   if (mmx_supported == 2) {
+       /* this should have happened in png_init_mmx_flags() already */
+       png_warning(png_ptr, "asm_flags may not have been initialized");
+       png_mmx_support();
+   }
 
    if (row != NULL && row_info != NULL)
    {
@@ -1195,7 +1185,9 @@ png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
             // sign fix by GRR
             // NOTE:  there is NO MMX code for 48-bit and 64-bit images
 
-            if (mmx_supported) // use MMX routine if machine supports it
+            // use MMX routine if machine supports it
+            if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_INTERLACE)
+                /* && mmx_supported */ )
             {
                if (pixel_bytes == 3)
                {
@@ -1883,9 +1875,6 @@ loop4_pass4:
          (png_uint_32)row_info->pixel_depth + 7) >> 3);
    }
 
-#ifdef DISABLE_PNGVCRD_INTERLACE
-   mmx_supported = save_mmx_supported;
-#endif
 }
 
 #endif /* PNG_READ_INTERLACING_SUPPORTED */
@@ -2117,8 +2106,8 @@ davg4lp:
       case 2:
       {
          ActiveMask.use  = 0x000000000000ffff;
-         ShiftBpp.use = 24;   // == 3 * 8
-         ShiftRem.use = 40;   // == 64 - 24
+         ShiftBpp.use = 16;   // == 2 * 8     [BUGFIX]
+         ShiftRem.use = 48;   // == 64 - 16   [BUGFIX]
          _asm {
             // Load ActiveMask
             movq mm7, ActiveMask
@@ -2133,7 +2122,7 @@ davg4lp:
                               // (we correct position in loop below)
 davg2lp:
             movq mm0, [edi + ebx]
-            psllq mm2, ShiftRem  // shift data to position correctly
+            psrlq mm2, ShiftRem  // shift data to position correctly   [BUGFIX]
             movq mm1, [esi + ebx]
             // Add (Prev_row/2) to Average
             movq mm3, mm5
@@ -3321,7 +3310,7 @@ dsub3lp:
       case 1:
       {
          // Placed here just in case this is a duplicate of the
-         // non-MMX code for the SUB filter in png_read_filter_row above
+         // non-MMX code for the SUB filter in png_read_filter_row below
          //
          //         png_bytep rp;
          //         png_bytep lp;
@@ -3656,61 +3645,56 @@ png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep
    row, png_bytep prev_row, int filter)
 {
 #ifdef PNG_DEBUG
-   char filnm[6];
+   char filnm[10];
 #endif
-#define UseMMX 1
 
-   if (mmx_supported == 2)
-       mmx_supported = mmxsupport();
-
-   if (!mmx_supported)
-   {
-       png_read_filter_row_c(png_ptr, row_info, row, prev_row, filter);
-       return ;
+   if (mmx_supported == 2) {
+       /* this should have happened in png_init_mmx_flags() already */
+       png_warning(png_ptr, "asm_flags may not have been initialized");
+       png_mmx_support();
    }
 
 #ifdef PNG_DEBUG
    png_debug(1, "in png_read_filter_row\n");
-#if (UseMMX == 1)
-   png_debug1(0,"%s, ", "MMX");
-#else
-   png_debug1(0,"%s, ", "x86");
-#endif
    switch (filter)
    {
-      case 0: sprintf(filnm, "None ");
+      case 0: sprintf(filnm, "none");
          break;
-      case 1: sprintf(filnm, "Sub  ");
+      case 1: sprintf(filnm, "sub-%s",
+        (png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_SUB)? "MMX" : "x86");
          break;
-      case 2: sprintf(filnm, "Up   ");
+      case 2: sprintf(filnm, "up-%s",
+        (png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_UP)? "MMX" : "x86");
          break;
-      case 3: sprintf(filnm, "Avg  ");
+      case 3: sprintf(filnm, "avg-%s",
+        (png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_AVG)? "MMX" : "x86");
          break;
-      case 4: sprintf(filnm, "Paeth");
+      case 4: sprintf(filnm, "Paeth-%s",
+        (png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_PAETH)? "MMX":"x86");
          break;
-      default: sprintf(filnm, "Unknw");
+      default: sprintf(filnm, "unknw");
          break;
    }
    png_debug2(0,"row=%5d, %s, ", png_ptr->row_number, filnm);
    png_debug2(0, "pd=%2d, b=%d, ", (int)row_info->pixel_depth,
       (int)((row_info->pixel_depth + 7) >> 3));
    png_debug1(0,"len=%8d, ", row_info->rowbytes);
-#endif
+#endif /* PNG_DEBUG */
 
    switch (filter)
    {
       case PNG_FILTER_VALUE_NONE:
          break;
+
       case PNG_FILTER_VALUE_SUB:
       {
-#if (UseMMX == 1)
-         if ((row_info->pixel_depth > 8) &&
-            (row_info->rowbytes >= 128) )
+         if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_SUB) &&
+             (row_info->pixel_depth >= png_ptr->mmx_bitdepth_threshold) &&
+             (row_info->rowbytes >= png_ptr->mmx_rowbytes_threshold))
          {
             png_read_filter_row_mmx_sub(row_info, row);
          }
          else
-#endif
          {
             png_uint_32 i;
             png_uint_32 istop = row_info->rowbytes;
@@ -3723,41 +3707,43 @@ png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep
                *rp = (png_byte)(((int)(*rp) + (int)(*lp++)) & 0xff);
                rp++;
             }
-         }  //end !UseMMX
+         }
          break;
       }
+
       case PNG_FILTER_VALUE_UP:
       {
-#if (UseMMX == 1)
-         if ((row_info->pixel_depth > 8) &&
-             (row_info->rowbytes >= 128) )
+         if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_UP) &&
+             (row_info->pixel_depth >= png_ptr->mmx_bitdepth_threshold) &&
+             (row_info->rowbytes >= png_ptr->mmx_rowbytes_threshold))
          {
             png_read_filter_row_mmx_up(row_info, row, prev_row);
-         }  //end if UseMMX
+         }
          else
-#endif
          {
-            png_bytep rp;
-            png_bytep pp;
             png_uint_32 i;
-            for (i = 0, rp = row, pp = prev_row;
-               i < row_info->rowbytes; i++, rp++, pp++)
+            png_uint_32 istop = row_info->rowbytes;
+            png_bytep rp = row;
+            png_bytep pp = prev_row;
+
+            for (i = 0; i < istop; ++i)
             {
-                  *rp = (png_byte)(((int)(*rp) + (int)(*pp)) & 0xff);
+               *rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff);
+               rp++;
             }
-         }  //end !UseMMX
+         }
          break;
       }
+
       case PNG_FILTER_VALUE_AVG:
       {
-#if (UseMMX == 1)
-         if ((row_info->pixel_depth > 8) &&
-             (row_info->rowbytes >= 128) )
+         if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_AVG) &&
+             (row_info->pixel_depth >= png_ptr->mmx_bitdepth_threshold) &&
+             (row_info->rowbytes >= png_ptr->mmx_rowbytes_threshold))
          {
             png_read_filter_row_mmx_avg(row_info, row, prev_row);
-         }  //end if UseMMX
+         }
          else
-#endif
          {
             png_uint_32 i;
             png_bytep rp = row;
@@ -3779,19 +3765,19 @@ png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep
                   ((int)(*pp++ + *lp++) >> 1)) & 0xff);
                rp++;
             }
-         }  //end !UseMMX
+         }
          break;
       }
+
       case PNG_FILTER_VALUE_PAETH:
       {
-#if (UseMMX == 1)
-         if ((row_info->pixel_depth > 8) &&
-             (row_info->rowbytes >= 128) )
+         if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_PAETH) &&
+             (row_info->pixel_depth >= png_ptr->mmx_bitdepth_threshold) &&
+             (row_info->rowbytes >= png_ptr->mmx_rowbytes_threshold))
          {
             png_read_filter_row_mmx_paeth(row_info, row, prev_row);
-         }  //end if UseMMX
+         }
          else
-#endif
          {
             png_uint_32 i;
             png_bytep rp = row;
@@ -3842,13 +3828,15 @@ png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep
                *rp = (png_byte)(((int)(*rp) + p) & 0xff);
                rp++;
             }
-         }  //end !UseMMX
+         }
          break;
       }
+
       default:
-         png_warning(png_ptr, "Ignoring bad adaptive filter type");
+         png_warning(png_ptr, "Ignoring bad row filter type");
          *row=0;
          break;
    }
 }
-#endif
+
+#endif /* PNG_ASSEMBLER_CODE_SUPPORTED && PNG_USE_PNGVCRD */

pngwio.c

@@ -1,11 +1,11 @@
 
 /* pngwio.c - functions for data output
  *
- * libpng 1.0.7beta13 - May 16, 2000
+ * libpng 1.2.1beta3 - October 27, 2001
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2001 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.)
  *
  * This file provides a location for all output.  Users who need
  * special handling are expected to write functions that have the same
@@ -17,6 +17,7 @@
 
 #define PNG_INTERNAL
 #include "png.h"
+#ifdef PNG_WRITE_SUPPORTED
 
 /* Write the data to whatever output you are using.  The default routine
    writes to a file pointer.  Note that this routine sometimes gets called
@@ -44,11 +45,14 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    png_uint_32 check;
 
-   check = fwrite(data, 1, length, (FILE *)(png_ptr->io_ptr));
+#if defined(_WIN32_WCE)
+   if ( !WriteFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) )
+      check = 0;
+#else
+   check = fwrite(data, 1, length, (png_FILE_p)(png_ptr->io_ptr));
+#endif
    if (check != length)
-   {
       png_error(png_ptr, "Write Error");
-   }
 }
 #else
 /* this is the model-independent version. Since the standard I/O library
@@ -64,14 +68,19 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    png_uint_32 check;
    png_byte *near_data;  /* Needs to be "png_byte *" instead of "png_bytep" */
-   FILE *io_ptr;
+   png_FILE_p io_ptr;
 
    /* Check if data really is near. If so, use usual code. */
    near_data = (png_byte *)CVT_PTR_NOCHECK(data);
-   io_ptr = (FILE *)CVT_PTR(png_ptr->io_ptr);
+   io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
    if ((png_bytep)near_data == data)
    {
+#if defined(_WIN32_WCE)
+      if ( !WriteFile(io_ptr, near_data, length, &check, NULL) )
+         check = 0;
+#else
       check = fwrite(near_data, 1, length, io_ptr);
+#endif
    }
    else
    {
@@ -83,7 +92,12 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
       {
          written = MIN(NEAR_BUF_SIZE, remaining);
          png_memcpy(buf, data, written); /* copy far buffer to near buffer */
+#if defined(_WIN32_WCE)
+         if ( !WriteFile(io_ptr, buf, written, &err, NULL) )
+            err = 0;
+#else
          err = fwrite(buf, 1, written, io_ptr);
+#endif
          if (err != written)
             break;
          else
@@ -94,9 +108,7 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
       while (remaining != 0);
    }
    if (check != length)
-   {
       png_error(png_ptr, "Write Error");
-   }
 }
 
 #endif
@@ -117,10 +129,12 @@ png_flush(png_structp png_ptr)
 static void /* PRIVATE */
 png_default_flush(png_structp png_ptr)
 {
-   FILE *io_ptr;
-   io_ptr = (FILE *)CVT_PTR((png_ptr->io_ptr));
+#if !defined(_WIN32_WCE)
+   png_FILE_p io_ptr;
+   io_ptr = (png_FILE_p)CVT_PTR((png_ptr->io_ptr));
    if (io_ptr != NULL)
       fflush(io_ptr);
+#endif
 }
 #endif
 #endif
@@ -211,3 +225,4 @@ void *png_far_to_near(png_structp png_ptr,png_voidp ptr, int check)
 }
 #   endif
 #   endif
+#endif /* PNG_WRITE_SUPPORTED */

pngwrite.c

@@ -1,16 +1,17 @@
 
 /* pngwrite.c - general routines to write a PNG file
  *
- * libpng 1.0.7beta13 - May 16, 2000
+ * libpng 1.2.1beta3 - October 27, 2001
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2001 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.)
  */
 
 /* get internal access to png.h */
 #define PNG_INTERNAL
 #include "png.h"
+#ifdef PNG_WRITE_SUPPORTED
 
 /* Writes all the PNG information.  This is the suggested way to use the
  * library.  If you have a new chunk to add, make a function to write it,
@@ -28,6 +29,13 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
    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_ptr->mng_features_permitted=0;
+   }
+#endif
    /* write IHDR information. */
    png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,
       info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
@@ -57,7 +65,7 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
 #endif
 #if defined(PNG_WRITE_iCCP_SUPPORTED)
    if (info_ptr->valid & PNG_INFO_iCCP)
-      png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_TEXT_COMPRESSION_NONE,
+      png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE,
                      info_ptr->iccp_profile, (int)info_ptr->iccp_proflen);
 #endif
 #if defined(PNG_WRITE_sBIT_SUPPORTED)
@@ -375,9 +383,16 @@ 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)
+#if !defined(_WIN32_WCE)
+/* "time.h" functions are not supported on WindowsCE */
 void PNGAPI
 png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime)
 {
@@ -400,6 +415,7 @@ png_convert_from_time_t(png_timep ptime, time_t ttime)
    png_convert_from_struct_tm(ptime, tbuf);
 }
 #endif
+#endif
 
 /* Initialize png_ptr structure, and allocate any memory needed */
 png_structp PNGAPI
@@ -408,7 +424,7 @@ png_create_write_struct(png_const_charp user_png_ver, png_voidp error_ptr,
 {
 #ifdef PNG_USER_MEM_SUPPORTED
    return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn,
-      warn_fn, NULL, NULL, NULL));
+      warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL));
 }
 
 /* Alternate initialize png_ptr structure, and allocate any memory needed */
@@ -428,13 +444,15 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
    png_debug(1, "in png_create_write_struct\n");
 #ifdef PNG_USER_MEM_SUPPORTED
    if ((png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
-      (png_malloc_ptr)malloc_fn)) == NULL)
+      (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr)) == NULL)
 #else
    if ((png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG)) == NULL)
 #endif /* PNG_USER_MEM_SUPPORTED */
-   {
-      return ((png_structp)NULL);
-   }
+      return (NULL);
+
+#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
+   png_init_mmx_flags(png_ptr);   /* 1.2.0 addition */
+#endif
 
 #ifdef PNG_SETJMP_SUPPORTED
 #ifdef USE_FAR_KEYWORD
@@ -444,8 +462,9 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
 #endif
    {
       png_free(png_ptr, png_ptr->zbuf);
+      png_ptr->zbuf=NULL;
       png_destroy_struct(png_ptr);
-      return ((png_structp)NULL);
+      return (NULL);
    }
 #ifdef USE_FAR_KEYWORD
    png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
@@ -472,23 +491,27 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
       * only check the first digit.
       */
      if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
+         (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
          (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
      {
+#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
+        char msg[80];
+        if (user_png_ver)
+        {
+          sprintf(msg, "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_libpng_ver);
+        png_warning(png_ptr, msg);
+#endif
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+        png_ptr->flags=0;
+#endif
         png_error(png_ptr,
            "Incompatible libpng version in application and library");
      }
-
-     /* Libpng 1.0.6 was not binary compatible, due to insertion of the
-        info_ptr->free_me member.  Note to maintainer: this test can be
-        removed from version 2.0.0 and beyond because the previous test
-        would have already rejected it. */
-
-     if (user_png_ver[4] == '6' && user_png_ver[2] == '0' && 
-         user_png_ver[0] == '1' && user_png_ver[5] == '\0')
-     {
-        png_error(png_ptr,
-           "Application must be recompiled; version 1.0.6 was incompatible");
-     }
    }
 
    /* initialize zbuf - compression buffer */
@@ -496,11 +519,12 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
    png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
       (png_uint_32)png_ptr->zbuf_size);
 
-   png_set_write_fn(png_ptr, NULL, NULL, NULL);
+   png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
+      png_flush_ptr_NULL);
 
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
    png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
-      1, NULL, NULL);
+      1, png_doublep_NULL, png_doublep_NULL);
 #endif
 
    return ((png_structp)png_ptr);
@@ -512,13 +536,58 @@ void PNGAPI
 png_write_init(png_structp png_ptr)
 {
    /* We only come here via pre-1.0.7-compiled applications */
-   png_write_init_2(png_ptr, "1.0.0", 10000, 10000);
+   png_write_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
 }
 
+#undef png_write_init_2
 void PNGAPI
 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 !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
+   if(sizeof(png_struct) > png_struct_size || 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",
+           user_png_ver);
+        png_warning(png_ptr, msg);
+      }
+      sprintf(msg, "Application  is running with png.c from libpng-%.20s",
+         png_libpng_ver);
+      png_warning(png_ptr, msg);
+   }
+#endif
+   if(sizeof(png_struct) > png_struct_size)
+     {
+       png_ptr->error_fn=NULL;
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+       png_ptr->flags=0;
+#endif
+       png_error(png_ptr,
+       "The png struct allocated by the application for writing is too small.");
+     }
+   if(sizeof(png_info) > png_info_size)
+     {
+       png_ptr->error_fn=NULL;
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+       png_ptr->flags=0;
+#endif
+       png_error(png_ptr,
+       "The info struct allocated by the application for writing is too small.");
+     }
+   png_write_init_3(&png_ptr, user_png_ver, png_struct_size);
+}
+
+
+void PNGAPI
+png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
+   png_size_t png_struct_size)
+{
+   png_structp png_ptr=*ptr_ptr;
 #ifdef PNG_SETJMP_SUPPORTED
    jmp_buf tmp_jmp; /* to save current jump buffer */
 #endif
@@ -530,45 +599,51 @@ png_write_init_2(png_structp png_ptr, png_const_charp user_png_ver,
 #ifdef PNG_LEGACY_SUPPORTED
        png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
 #else
-       png_ptr->error_fn=(png_error_ptr)NULL;
-       png_error(png_ptr,
-       "Application uses deprecated png_write_init() and must be recompiled.");
+       png_ptr->warning_fn=NULL;
+       png_warning(png_ptr,
+     "Application uses deprecated png_write_init() and should be recompiled.");
+       break;
 #endif
      }
    } while (png_libpng_ver[i++]);
 
-   if (sizeof(png_struct) > png_struct_size ||
-      sizeof(png_info) > png_info_size)
-     {
-       png_ptr->error_fn=(png_error_ptr)NULL;
-       png_error(png_ptr,
-      "Application and library have different sized structs. Please recompile.");
-     }
-
-   png_debug(1, "in png_write_init_2\n");
+   png_debug(1, "in png_write_init_3\n");
 
 #ifdef PNG_SETJMP_SUPPORTED
    /* save jump buffer and error functions */
    png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf));
 #endif
 
+   if (sizeof(png_struct) > png_struct_size)
+     {
+       png_destroy_struct(png_ptr);
+       png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
+       *ptr_ptr = png_ptr;
+     }
+
    /* reset all variables to 0 */
    png_memset(png_ptr, 0, sizeof (png_struct));
 
+#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
+   png_init_mmx_flags(png_ptr);   /* 1.2.0 addition */
+#endif
+
 #ifdef PNG_SETJMP_SUPPORTED
    /* restore jump buffer */
    png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf));
 #endif
 
+   png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
+      png_flush_ptr_NULL);
+
    /* initialize zbuf - compression buffer */
    png_ptr->zbuf_size = PNG_ZBUF_SIZE;
    png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
       (png_uint_32)png_ptr->zbuf_size);
-   png_set_write_fn(png_ptr, NULL, NULL, NULL);
 
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
    png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
-      1, NULL, NULL);
+      1, png_doublep_NULL, png_doublep_NULL);
 #endif
 }
 
@@ -734,11 +809,11 @@ png_write_row(png_structp png_ptr, png_bytep row)
       (png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3);
 
    png_debug1(3, "row_info->color_type = %d\n", png_ptr->row_info.color_type);
-   png_debug1(3, "row_info->width = %d\n", png_ptr->row_info.width);
+   png_debug1(3, "row_info->width = %lu\n", png_ptr->row_info.width);
    png_debug1(3, "row_info->channels = %d\n", png_ptr->row_info.channels);
    png_debug1(3, "row_info->bit_depth = %d\n", png_ptr->row_info.bit_depth);
    png_debug1(3, "row_info->pixel_depth = %d\n", png_ptr->row_info.pixel_depth);
-   png_debug1(3, "row_info->rowbytes = %d\n", png_ptr->row_info.rowbytes);
+   png_debug1(3, "row_info->rowbytes = %lu\n", png_ptr->row_info.rowbytes);
 
    /* Copy user's row into buffer, leaving room for filter byte. */
    png_memcpy_check(png_ptr, png_ptr->row_buf + 1, row,
@@ -764,6 +839,24 @@ png_write_row(png_structp png_ptr, png_bytep row)
    if (png_ptr->transformations)
       png_do_write_transformations(png_ptr);
 
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+   /* Write filter_method 64 (intrapixel differencing) only if
+    * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
+    * 2. Libpng did not write a PNG signature (this filter_method is only
+    *    used in PNG datastreams that are embedded in MNG datastreams) and
+    * 3. The application called png_permit_mng_features with a mask that
+    *    included PNG_FLAG_MNG_FILTER_64 and
+    * 4. The filter_method is 64 and
+    * 5. The color_type is RGB or RGBA
+    */
+   if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+      (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
+   {
+      /* Intrapixel differencing */
+      png_do_write_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
+   }
+#endif
+
    /* Find a filter if necessary, filter the row and write it out. */
    png_write_find_filter(png_ptr, &(png_ptr->row_info));
 
@@ -841,6 +934,7 @@ png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
    png_infop info_ptr = NULL;
 #ifdef PNG_USER_MEM_SUPPORTED
    png_free_ptr free_fn = NULL;
+   png_voidp mem_ptr = NULL;
 #endif
 
    png_debug(1, "in png_destroy_write_struct\n");
@@ -863,33 +957,36 @@ png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
       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, free_fn);
+      png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
+         (png_voidp)mem_ptr);
 #else
       png_destroy_struct((png_voidp)info_ptr);
 #endif
-      *info_ptr_ptr = (png_infop)NULL;
+      *info_ptr_ptr = NULL;
    }
 
    if (png_ptr != NULL)
    {
       png_write_destroy(png_ptr);
 #ifdef PNG_USER_MEM_SUPPORTED
-      png_destroy_struct_2((png_voidp)png_ptr, free_fn);
+      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);
 #endif
-      *png_ptr_ptr = (png_structp)NULL;
+      *png_ptr_ptr = NULL;
    }
 }
 
 
 /* Free any memory used in png_ptr struct (old method) */
-void PNGAPI
+void /* PRIVATE */
 png_write_destroy(png_structp png_ptr)
 {
 #ifdef PNG_SETJMP_SUPPORTED
@@ -958,7 +1055,11 @@ void PNGAPI
 png_set_filter(png_structp png_ptr, int method, int filters)
 {
    png_debug(1, "in png_set_filter\n");
-   /* We allow 'method' only for future expansion of the base filter method. */
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+   if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+      (method == PNG_INTRAPIXEL_DIFFERENCING))
+         method = PNG_FILTER_TYPE_BASE;
+#endif
    if (method == PNG_FILTER_TYPE_BASE)
    {
       switch (filters & (PNG_ALL_FILTERS | 0x07))
@@ -1098,12 +1199,11 @@ png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
 
       if (png_ptr->filter_weights == NULL)
       {
-         png_ptr->filter_weights = (png_uint_16p) png_malloc(png_ptr,
+         png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr,
             (png_uint_32)(sizeof(png_uint_16) * num_weights));
 
-         png_ptr->inv_filter_weights = (png_uint_16p) png_malloc(png_ptr,
+         png_ptr->inv_filter_weights = (png_uint_16p)png_malloc(png_ptr,
             (png_uint_32)(sizeof(png_uint_16) * num_weights));
-
          for (i = 0; i < num_weights; i++)
          {
             png_ptr->inv_filter_weights[i] =
@@ -1133,10 +1233,10 @@ png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
     */
    if (png_ptr->filter_costs == NULL)
    {
-      png_ptr->filter_costs = (png_uint_16p) png_malloc(png_ptr,
+      png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr,
          (png_uint_32)(sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
 
-      png_ptr->inv_filter_costs = (png_uint_16p) png_malloc(png_ptr,
+      png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr,
          (png_uint_32)(sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
 
       for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
@@ -1320,7 +1420,8 @@ 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 == (voidp)NULL)
+   if(transforms == 0 || params == NULL)
       /* quiet compiler warnings */ return;
 }
 #endif
+#endif /* PNG_WRITE_SUPPORTED */

pngwtran.c

@@ -1,15 +1,16 @@
 
 /* pngwtran.c - transforms the data in a row for PNG writers
  *
- * libpng 1.0.7beta13 - May 16, 2000
+ * libpng 1.2.1beta3 - October 27, 2001
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2001 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.)
  */
 
 #define PNG_INTERNAL
 #include "png.h"
+#ifdef PNG_WRITE_SUPPORTED
 
 /* Transform the data according to the user's wishes.  The order of
  * transformations is significant.
@@ -498,3 +499,65 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
    }
 }
 #endif
+
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+/* undoes intrapixel differencing  */
+void /* PRIVATE */
+png_do_write_intrapixel(png_row_infop row_info, png_bytep row)
+{
+   png_debug(1, "in png_do_write_intrapixel\n");
+   if (
+#if defined(PNG_USELESS_TESTS_SUPPORTED)
+       row != NULL && row_info != NULL &&
+#endif
+       (row_info->color_type & PNG_COLOR_MASK_COLOR))
+   {
+      int bytes_per_pixel;
+      png_uint_32 row_width = row_info->width;
+      if (row_info->bit_depth == 8)
+      {
+         png_bytep rp;
+         png_uint_32 i;
+
+         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+            bytes_per_pixel = 3;
+         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+            bytes_per_pixel = 4;
+         else
+            return;
+
+         for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
+         {
+            *(rp)   = (png_byte)((*rp     - *(rp+1))&0xff);
+            *(rp+2) = (png_byte)((*(rp+2) - *(rp+1))&0xff);
+         }
+      }
+      else if (row_info->bit_depth == 16)
+      {
+         png_bytep rp;
+         png_uint_32 i;
+
+         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+            bytes_per_pixel = 6;
+         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+            bytes_per_pixel = 8;
+         else
+            return;
+
+         for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
+         {
+            png_uint_32 s0=*(rp  )<<8 | *(rp+1);
+            png_uint_32 s1=*(rp+2)<<8 | *(rp+3);
+            png_uint_32 s2=*(rp+4)<<8 | *(rp+5);
+            png_uint_32 red=(s0-s1)&0xffff;
+            png_uint_32 blue=(s2-s1)&0xffff;
+            *(rp  ) = (png_byte)((red>>8)&0xff);
+            *(rp+1) = (png_byte)(red&0xff);
+            *(rp+4) = (png_byte)((blue>>8)&0xff);
+            *(rp+5) = (png_byte)(blue&0xff);
+         }
+      }
+   }
+}
+#endif /* PNG_MNG_FEATURES_SUPPORTED */
+#endif /* PNG_WRITE_SUPPORTED */

pngwutil.c

@@ -1,15 +1,16 @@
 
 /* pngwutil.c - utilities to write a PNG file
  *
- * libpng 1.0.7beta13 - May 16, 2000
+ * libpng 1.2.1beta3 - October 27, 2001
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2001 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.)
  */
 
 #define PNG_INTERNAL
 #include "png.h"
+#ifdef PNG_WRITE_SUPPORTED
 
 /* Place a 32-bit number into a buffer in PNG byte order.  We work
  * with unsigned numbers for convenience, although one supported
@@ -24,7 +25,7 @@ png_save_uint_32(png_bytep buf, png_uint_32 i)
    buf[3] = (png_byte)(i & 0xff);
 }
 
-#if defined(PNG_WRITE_pCAL_SUPPORTED)
+#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.
@@ -77,7 +78,7 @@ png_write_chunk_start(png_structp png_ptr, png_bytep chunk_name,
    png_uint_32 length)
 {
    png_byte buf[4];
-   png_debug2(0, "Writing %s chunk (%d bytes)\n", chunk_name, length);
+   png_debug2(0, "Writing %s chunk (%lu bytes)\n", chunk_name, length);
 
    /* write the length */
    png_save_uint_32(buf, length);
@@ -131,6 +132,8 @@ png_write_sig(png_structp png_ptr)
    /* write the rest of the 8 byte signature */
    png_write_data(png_ptr, &png_signature[png_ptr->sig_bytes],
       (png_size_t)8 - png_ptr->sig_bytes);
+   if(png_ptr->sig_bytes < 3)
+      png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
 }
 
 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_iCCP_SUPPORTED)
@@ -172,7 +175,7 @@ png_text_compress(png_structp png_ptr,
 
    if (compression >= PNG_TEXT_COMPRESSION_LAST)
    {
-#if !defined(PNG_NO_STDIO)
+#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
       char msg[50];
       sprintf(msg, "Unknown compression type %d", compression);
       png_warning(png_ptr, msg);
@@ -232,8 +235,8 @@ png_text_compress(png_structp png_ptr,
                old_ptr = comp->output_ptr;
                comp->output_ptr = (png_charpp)png_malloc(png_ptr,
                   (png_uint_32)(comp->max_output_ptr * sizeof (png_charpp)));
-               png_memcpy(comp->output_ptr, old_ptr,
-           old_max * sizeof (png_charp));
+               png_memcpy(comp->output_ptr, old_ptr, old_max
+                  * sizeof (png_charp));
                png_free(png_ptr, old_ptr);
             }
             else
@@ -260,7 +263,49 @@ png_text_compress(png_structp png_ptr,
    {
       /* tell zlib we are finished */
       ret = deflate(&png_ptr->zstream, Z_FINISH);
-      if (ret != Z_OK && ret != Z_STREAM_END)
+
+      if (ret == Z_OK)
+      {
+         /* check to see if we need more room */
+         if (!(png_ptr->zstream.avail_out))
+         {
+            /* check to make sure our output array has room */
+            if (comp->num_output_ptr >= comp->max_output_ptr)
+            {
+               int old_max;
+
+               old_max = comp->max_output_ptr;
+               comp->max_output_ptr = comp->num_output_ptr + 4;
+               if (comp->output_ptr != NULL)
+               {
+                  png_charpp old_ptr;
+
+                  old_ptr = comp->output_ptr;
+                  /* This could be optimized to realloc() */
+                  comp->output_ptr = (png_charpp)png_malloc(png_ptr,
+                     (png_uint_32)(comp->max_output_ptr * sizeof (png_charpp)));
+                  png_memcpy(comp->output_ptr, old_ptr,
+                     old_max * sizeof (png_charp));
+                  png_free(png_ptr, old_ptr);
+               }
+               else
+                  comp->output_ptr = (png_charpp)png_malloc(png_ptr,
+                     (png_uint_32)(comp->max_output_ptr * sizeof (png_charp)));
+            }
+
+            /* save off the data */
+            comp->output_ptr[comp->num_output_ptr] =
+               (png_charp)png_malloc(png_ptr, (png_uint_32)png_ptr->zbuf_size);
+            png_memcpy(comp->output_ptr[comp->num_output_ptr], png_ptr->zbuf,
+               png_ptr->zbuf_size);
+            comp->num_output_ptr++;
+
+            /* and reset the buffer pointers */
+            png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+            png_ptr->zstream.next_out = png_ptr->zbuf;
+         }
+      }
+      else if (ret != Z_STREAM_END)
       {
          /* we got an error */
          if (png_ptr->zstream.msg != NULL)
@@ -268,45 +313,6 @@ png_text_compress(png_structp png_ptr,
          else
             png_error(png_ptr, "zlib error");
       }
-
-      /* check to see if we need more room */
-      if (!(png_ptr->zstream.avail_out) && ret == Z_OK)
-      {
-         /* check to make sure our output array has room */
-         if (comp->num_output_ptr >= comp->max_output_ptr)
-         {
-            int old_max;
-
-            old_max = comp->max_output_ptr;
-            comp->max_output_ptr = comp->num_output_ptr + 4;
-            if (comp->output_ptr != NULL)
-            {
-               png_charpp old_ptr;
-
-               old_ptr = comp->output_ptr;
-               /* This could be optimized to realloc() */
-               comp->output_ptr = (png_charpp)png_malloc(png_ptr,
-                  (png_uint_32)(comp->max_output_ptr * sizeof (png_charpp)));
-               png_memcpy(comp->output_ptr, old_ptr,
-           old_max * sizeof (png_charp));
-               png_free(png_ptr, old_ptr);
-            }
-            else
-               comp->output_ptr = (png_charpp)png_malloc(png_ptr,
-                  (png_uint_32)(comp->max_output_ptr * sizeof (png_charp)));
-         }
-
-         /* save off the data */
-         comp->output_ptr[comp->num_output_ptr] = (png_charp)png_malloc(png_ptr,
-            (png_uint_32)png_ptr->zbuf_size);
-         png_memcpy(comp->output_ptr[comp->num_output_ptr], png_ptr->zbuf,
-            png_ptr->zbuf_size);
-         comp->num_output_ptr++;
-
-         /* and reset the buffer pointers */
-         png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
-         png_ptr->zstream.next_out = png_ptr->zbuf;
-      }
    } while (ret != Z_STREAM_END);
 
    /* text length is number of buffers plus last buffer */
@@ -326,7 +332,8 @@ png_write_compressed_data_out(png_structp png_ptr, compression_state *comp)
    /* handle the no-compression case */
    if (comp->input)
    {
-       png_write_chunk_data(png_ptr, (png_bytep)comp->input, comp->input_len);
+       png_write_chunk_data(png_ptr, (png_bytep)comp->input,
+                            (png_size_t)comp->input_len);
        return;
    }
 
@@ -336,9 +343,11 @@ png_write_compressed_data_out(png_structp png_ptr, compression_state *comp)
       png_write_chunk_data(png_ptr,(png_bytep)comp->output_ptr[i],
          png_ptr->zbuf_size);
       png_free(png_ptr, comp->output_ptr[i]);
+      comp->output_ptr[i]=NULL;
    }
    if (comp->max_output_ptr != 0)
       png_free(png_ptr, comp->output_ptr);
+      comp->output_ptr=NULL;
    /* write anything left in zbuf */
    if (png_ptr->zstream.avail_out < (png_uint_32)png_ptr->zbuf_size)
       png_write_chunk_data(png_ptr, png_ptr->zbuf,
@@ -414,7 +423,24 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
       compression_type = PNG_COMPRESSION_TYPE_BASE;
    }
 
-   if (filter_type != PNG_FILTER_TYPE_BASE)
+   /* Write filter_method 64 (intrapixel differencing) only if
+    * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
+    * 2. Libpng did not write a PNG signature (this filter_method is only
+    *    used in PNG datastreams that are embedded in MNG datastreams) and
+    * 3. The application called png_permit_mng_features with a mask that
+    *    included PNG_FLAG_MNG_FILTER_64 and
+    * 4. The filter_method is 64 and
+    * 5. The color_type is RGB or RGBA
+    */
+   if (
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+      !((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+      ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) &&
+      (color_type == PNG_COLOR_TYPE_RGB ||
+       color_type == PNG_COLOR_TYPE_RGB_ALPHA) &&
+      (filter_type == PNG_INTRAPIXEL_DIFFERENCING)) &&
+#endif
+      filter_type != PNG_FILTER_TYPE_BASE)
    {
       png_warning(png_ptr, "Invalid filter type specified");
       filter_type = PNG_FILTER_TYPE_BASE;
@@ -435,6 +461,9 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
    png_ptr->bit_depth = (png_byte)bit_depth;
    png_ptr->color_type = (png_byte)color_type;
    png_ptr->interlaced = (png_byte)interlace_type;
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+   png_ptr->filter_type = (png_byte)filter_type;
+#endif
    png_ptr->width = width;
    png_ptr->height = height;
 
@@ -509,26 +538,34 @@ png_write_PLTE(png_structp png_ptr, png_colorp palette, png_uint_32 num_pal)
 
    png_debug(1, "in png_write_PLTE\n");
    if ((
-#ifdef PNG_WRITE_EMPTY_PLTE_SUPPORTED
-        !png_ptr->empty_plte_permitted &&
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+        !(png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) &&
 #endif
         num_pal == 0) || num_pal > 256)
+   {
+     if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
      {
-       if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
-         {
-           png_error(png_ptr, "Invalid number of colors in palette");
-         }
-       else
-         {
-           png_warning(png_ptr, "Invalid number of colors in palette");
-           return;
-         }
+        png_error(png_ptr, "Invalid number of colors in palette");
+     }
+     else
+     {
+        png_warning(png_ptr, "Invalid number of colors in palette");
+        return;
+     }
+   }
+
+   if (!(png_ptr->color_type&PNG_COLOR_MASK_COLOR))
+   {
+      png_warning(png_ptr,
+        "Ignoring request to write a PLTE chunk in grayscale PNG");
+      return;
    }
 
    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);
+#ifndef PNG_NO_POINTER_INDEXING
    for (i = 0, pal_ptr = palette; i < num_pal; i++, pal_ptr++)
    {
       buf[0] = pal_ptr->red;
@@ -536,6 +573,17 @@ png_write_PLTE(png_structp png_ptr, png_colorp palette, png_uint_32 num_pal)
       buf[2] = pal_ptr->blue;
       png_write_chunk_data(png_ptr, buf, (png_size_t)3);
    }
+#else
+   /* This is a little slower but some buggy compilers need to do this instead */
+   pal_ptr=palette;
+   for (i = 0; i < num_pal; i++)
+   {
+      buf[0] = pal_ptr[i].red;
+      buf[1] = pal_ptr[i].green;
+      buf[2] = pal_ptr[i].blue;
+      png_write_chunk_data(png_ptr, buf, (png_size_t)3);
+   }
+#endif
    png_write_chunk_end(png_ptr);
    png_ptr->mode |= PNG_HAVE_PLTE;
 }
@@ -560,7 +608,8 @@ 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, NULL, (png_size_t)0);
+   png_write_chunk(png_ptr, (png_bytep)png_IEND, png_bytep_NULL,
+     (png_size_t)0);
    png_ptr->mode |= PNG_HAVE_IEND;
 }
 
@@ -594,7 +643,7 @@ 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, file_gamma);
+   png_save_uint_32(buf, (png_uint_32)file_gamma);
    png_write_chunk(png_ptr, (png_bytep)png_gAMA, buf, (png_size_t)4);
 }
 #endif
@@ -640,19 +689,20 @@ png_write_iCCP(png_structp png_ptr, png_charp name, int compression_type,
       return;
    }
 
-   if (compression_type)
+   if (compression_type != PNG_COMPRESSION_TYPE_BASE)
       png_warning(png_ptr, "Unknown compression type in iCCP chunk");
 
-   if (profile == NULL || *profile == '\0')
+   if (profile == NULL)
       profile_len = 0;
 
    if (profile_len)
        profile_len = png_text_compress(png_ptr, profile, (png_size_t)profile_len,
-          PNG_TEXT_COMPRESSION_zTXt, &comp);
+          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_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);
 
    if (profile_len)
@@ -677,6 +727,9 @@ png_write_sPLT(png_structp png_ptr, png_sPLT_tp spalette)
    int entry_size = (spalette->depth == 8 ? 6 : 10);
    int palette_size = entry_size * spalette->nentries;
    png_sPLT_entryp ep;
+#ifdef PNG_NO_POINTER_INDEXING
+   int i;
+#endif
 
    png_debug(1, "in png_write_sPLT\n");
    if (spalette->name == NULL || (name_len = png_check_keyword(png_ptr,
@@ -687,12 +740,13 @@ 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_bytep)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);
 
    /* loop through each palette entry, writing appropriately */
+#ifndef PNG_NO_POINTER_INDEXING
    for (ep = spalette->entries; ep<spalette->entries+spalette->nentries; ep++)
    {
        if (spalette->depth == 8)
@@ -711,8 +765,31 @@ png_write_sPLT(png_structp png_ptr, png_sPLT_tp spalette)
            png_save_uint_16(entrybuf + 6, ep->alpha);
            png_save_uint_16(entrybuf + 8, ep->frequency);
        }
+       png_write_chunk_data(png_ptr, entrybuf, (png_size_t)entry_size);
+   }
+#else
+   ep=spalette->entries;
+   for (i=0; i>spalette->nentries; i++)
+   {
+       if (spalette->depth == 8)
+       {
+           entrybuf[0] = (png_byte)ep[i].red;
+           entrybuf[1] = (png_byte)ep[i].green;
+           entrybuf[2] = (png_byte)ep[i].blue;
+           entrybuf[3] = (png_byte)ep[i].alpha;
+           png_save_uint_16(entrybuf + 4, ep[i].frequency);
+       }
+       else
+       {
+           png_save_uint_16(entrybuf + 0, ep[i].red);
+           png_save_uint_16(entrybuf + 2, ep[i].green);
+           png_save_uint_16(entrybuf + 4, ep[i].blue);
+           png_save_uint_16(entrybuf + 6, ep[i].alpha);
+           png_save_uint_16(entrybuf + 8, ep[i].frequency);
+       }
        png_write_chunk_data(png_ptr, entrybuf, entry_size);
    }
+#endif
 
    png_write_chunk_end(png_ptr);
    png_free(png_ptr, new_name);
@@ -795,8 +872,8 @@ png_write_cHRM(png_structp png_ptr, double white_x, double white_y,
        white_x + white_y > 1.0)
    {
       png_warning(png_ptr, "Invalid cHRM white point specified");
-#if !defined(PNG_NO_STDIO)
-      printf("white_x=%f, white_y=%f\n",white_x, white_y);
+#if !defined(PNG_NO_CONSOLE_IO)
+      fprintf(stderr,"white_x=%f, white_y=%f\n",white_x, white_y);
 #endif
       return;
    }
@@ -858,37 +935,37 @@ png_write_cHRM_fixed(png_structp png_ptr, png_fixed_point white_x,
    if (white_x > 80000L || white_y > 80000L || white_x + white_y > 100000L)
    {
       png_warning(png_ptr, "Invalid fixed cHRM white point specified");
-#if !defined(PNG_NO_STDIO)
-      printf("white_x=%ld, white_y=%ld\n",white_x, white_y);
+#if !defined(PNG_NO_CONSOLE_IO)
+      fprintf(stderr,"white_x=%ld, white_y=%ld\n",white_x, white_y);
 #endif
       return;
    }
-   png_save_uint_32(buf, white_x);
-   png_save_uint_32(buf + 4, white_y);
+   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)
    {
       png_warning(png_ptr, "Invalid cHRM fixed red point specified");
       return;
    }
-   png_save_uint_32(buf + 8, red_x);
-   png_save_uint_32(buf + 12, red_y);
+   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)
    {
       png_warning(png_ptr, "Invalid fixed cHRM green point specified");
       return;
    }
-   png_save_uint_32(buf + 16, green_x);
-   png_save_uint_32(buf + 20, green_y);
+   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)
    {
       png_warning(png_ptr, "Invalid fixed cHRM blue point specified");
       return;
    }
-   png_save_uint_32(buf + 24, blue_x);
-   png_save_uint_32(buf + 28, blue_y);
+   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);
 }
@@ -920,6 +997,12 @@ png_write_tRNS(png_structp png_ptr, png_bytep trans, png_color_16p tran,
    else if (color_type == PNG_COLOR_TYPE_GRAY)
    {
       /* one 16 bit value */
+      if(tran->gray >= (1 << png_ptr->bit_depth))
+      {
+         png_warning(png_ptr,
+           "Ignoring attempt to write tRNS chunk out-of-range for bit_depth");
+         return;
+      }
       png_save_uint_16(buf, tran->gray);
       png_write_chunk(png_ptr, (png_bytep)png_tRNS, buf, (png_size_t)2);
    }
@@ -929,6 +1012,12 @@ png_write_tRNS(png_structp png_ptr, png_bytep trans, png_color_16p tran,
       png_save_uint_16(buf, tran->red);
       png_save_uint_16(buf + 2, tran->green);
       png_save_uint_16(buf + 4, tran->blue);
+      if(png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4]))
+         {
+            png_warning(png_ptr,
+              "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);
    }
    else
@@ -952,9 +1041,9 @@ png_write_bKGD(png_structp png_ptr, png_color_16p back, int color_type)
    if (color_type == PNG_COLOR_TYPE_PALETTE)
    {
       if (
-#ifdef PNG_WRITE_EMPTY_PLTE_SUPPORTED
-          (!png_ptr->empty_plte_permitted ||
-          (png_ptr->empty_plte_permitted && png_ptr->num_palette)) &&
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+          (png_ptr->num_palette ||
+          (!(png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE))) &&
 #endif
          back->index > png_ptr->num_palette)
       {
@@ -969,10 +1058,22 @@ png_write_bKGD(png_structp png_ptr, png_color_16p back, int color_type)
       png_save_uint_16(buf, back->red);
       png_save_uint_16(buf + 2, back->green);
       png_save_uint_16(buf + 4, back->blue);
+      if(png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4]))
+         {
+            png_warning(png_ptr,
+              "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);
    }
    else
    {
+      if(back->gray >= (1 << png_ptr->bit_depth))
+      {
+         png_warning(png_ptr,
+           "Ignoring attempt to write bKGD chunk out-of-range for bit_depth");
+         return;
+      }
       png_save_uint_16(buf, back->gray);
       png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)2);
    }
@@ -1027,32 +1128,33 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
    png_size_t key_len;
    png_charp kp, dp;
    int kflag;
+   int kwarn=0;
 
    png_debug(1, "in png_check_keyword\n");
    *new_key = NULL;
 
    if (key == NULL || (key_len = png_strlen(key)) == 0)
    {
-      png_chunk_warning(png_ptr, "zero length keyword");
+      png_warning(png_ptr, "zero length keyword");
       return ((png_size_t)0);
    }
 
    png_debug1(2, "Keyword to be checked is '%s'\n", key);
 
-   *new_key = (png_charp)png_malloc(png_ptr, (png_uint_32)(key_len + 1));
+   *new_key = (png_charp)png_malloc(png_ptr, (png_uint_32)(key_len + 2));
 
    /* 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 !defined(PNG_NO_STDIO)
+#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
          char msg[40];
 
          sprintf(msg, "invalid keyword character 0x%02X", *kp);
-         png_chunk_warning(png_ptr, msg);
+         png_warning(png_ptr, msg);
 #else
-         png_chunk_warning(png_ptr, "invalid character in keyword");
+         png_warning(png_ptr, "invalid character in keyword");
 #endif
          *dp = ' ';
       }
@@ -1067,7 +1169,7 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
    kp = *new_key + key_len - 1;
    if (*kp == ' ')
    {
-      png_chunk_warning(png_ptr, "trailing spaces removed from keyword");
+      png_warning(png_ptr, "trailing spaces removed from keyword");
 
       while (*kp == ' ')
       {
@@ -1080,7 +1182,7 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
    kp = *new_key;
    if (*kp == ' ')
    {
-      png_chunk_warning(png_ptr, "leading spaces removed from keyword");
+      png_warning(png_ptr, "leading spaces removed from keyword");
 
       while (*kp == ' ')
       {
@@ -1102,6 +1204,7 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
       else if (*kp == ' ')
       {
          key_len--;
+         kwarn=1;
       }
       else
       {
@@ -1110,17 +1213,19 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
       }
    }
    *dp = '\0';
+   if(kwarn)
+      png_warning(png_ptr, "extra interior spaces removed from keyword");
 
    if (key_len == 0)
    {
       png_free(png_ptr, *new_key);
       *new_key=NULL;
-      png_chunk_warning(png_ptr, "Zero length keyword");
+      png_warning(png_ptr, "Zero length keyword");
    }
 
    if (key_len > 79)
    {
-      png_chunk_warning(png_ptr, "keyword length must be 1 - 79 characters");
+      png_warning(png_ptr, "keyword length must be 1 - 79 characters");
       new_key[79] = '\0';
       key_len = 79;
    }
@@ -1304,8 +1409,7 @@ png_write_iTXt(png_structp png_ptr, int compression, png_charp key,
 #if defined(PNG_WRITE_oFFs_SUPPORTED)
 /* write the oFFs chunk */
 void /* PRIVATE */
-png_write_oFFs(png_structp png_ptr, png_uint_32 x_offset,
-   png_uint_32 y_offset,
+png_write_oFFs(png_structp png_ptr, png_int_32 x_offset, png_int_32 y_offset,
    int unit_type)
 {
 #ifdef PNG_USE_LOCAL_ARRAYS
@@ -1317,8 +1421,8 @@ png_write_oFFs(png_structp png_ptr, png_uint_32 x_offset,
    if (unit_type >= PNG_OFFSET_LAST)
       png_warning(png_ptr, "Unrecognized unit type for oFFs chunk");
 
-   png_save_uint_32(buf, x_offset);
-   png_save_uint_32(buf + 4, y_offset);
+   png_save_int_32(buf, x_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);
@@ -1326,7 +1430,7 @@ png_write_oFFs(png_structp png_ptr, png_uint_32 x_offset,
 #endif
 
 #if defined(PNG_WRITE_pCAL_SUPPORTED)
-/* write the pCAL chunk (png-scivis-19970203) */
+/* write the pCAL chunk (described in the PNG extensions document) */
 void /* PRIVATE */
 png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0,
    png_int_32 X1, int type, int nparams, png_charp units, png_charpp params)
@@ -1345,9 +1449,9 @@ png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0,
       png_warning(png_ptr, "Unrecognized equation type for pCAL chunk");
 
    purpose_len = png_check_keyword(png_ptr, purpose, &new_purpose) + 1;
-   png_debug1(3, "pCAL purpose length = %d\n", purpose_len);
+   png_debug1(3, "pCAL purpose length = %d\n", (int)purpose_len);
    units_len = png_strlen(units) + (nparams == 0 ? 0 : 1);
-   png_debug1(3, "pCAL units length = %d\n", units_len);
+   png_debug1(3, "pCAL units length = %d\n", (int)units_len);
    total_len = purpose_len + units_len + 10;
 
    params_len = (png_uint_32p)png_malloc(png_ptr, (png_uint_32)(nparams
@@ -1358,11 +1462,11 @@ png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0,
    for (i = 0; i < nparams; i++)
    {
       params_len[i] = png_strlen(params[i]) + (i == nparams - 1 ? 0 : 1);
-      png_debug2(3, "pCAL parameter %d length = %d\n", i, params_len[i]);
+      png_debug2(3, "pCAL parameter %d length = %lu\n", i, params_len[i]);
       total_len += (png_size_t)params_len[i];
    }
 
-   png_debug1(3, "pCAL total length = %d\n", total_len);
+   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_data(png_ptr, (png_bytep)new_purpose, purpose_len);
    png_save_int_32(buf, X0);
@@ -1399,15 +1503,26 @@ png_write_sCAL(png_structp png_ptr, int unit, double width,double height)
 
    png_debug(1, "in png_write_sCAL\n");
 
+#if defined(_WIN32_WCE)
+/* sprintf() function is not supported on WindowsCE */
+   {
+      wchar_t wc_buf[32];
+      swprintf(wc_buf, TEXT("%12.12e"), width);
+      WideCharToMultiByte(CP_ACP, 0, wc_buf, -1, wbuf, 32, NULL, NULL);
+      swprintf(wc_buf, TEXT("%12.12e"), height);
+      WideCharToMultiByte(CP_ACP, 0, wc_buf, -1, hbuf, 32, NULL, NULL);
+   }
+#else
    sprintf(wbuf, "%12.12e", width);
    sprintf(hbuf, "%12.12e", height);
+#endif
    total_len = 1 + png_strlen(wbuf)+1 + png_strlen(hbuf);
 
-   png_debug1(3, "sCAL total length = %d\n", total_len);
+   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)&unit, 1);
-   png_write_chunk_data(png_ptr, (png_bytep)wbuf, strlen(wbuf)+1);
-   png_write_chunk_data(png_ptr, (png_bytep)hbuf, strlen(hbuf));
+   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);
 }
@@ -1425,15 +1540,15 @@ png_write_sCAL_s(png_structp png_ptr, int unit, png_charp width,
 
    png_debug(1, "in png_write_sCAL_s\n");
 
-   strcpy(wbuf,(const char *)width);
-   strcpy(hbuf,(const char *)height);
+   png_strcpy(wbuf,(const char *)width);
+   png_strcpy(hbuf,(const char *)height);
    total_len = 1 + png_strlen(wbuf)+1 + png_strlen(hbuf);
 
    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)&unit, 1);
-   png_write_chunk_data(png_ptr, (png_bytep)wbuf, strlen(wbuf)+1);
-   png_write_chunk_data(png_ptr, (png_bytep)hbuf, strlen(hbuf));
+   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);
 }
@@ -1672,20 +1787,23 @@ png_write_finish_row(png_structp png_ptr)
       /* tell the compressor we are done */
       ret = deflate(&png_ptr->zstream, Z_FINISH);
       /* check for an error */
-      if (ret != Z_OK && ret != Z_STREAM_END)
+      if (ret == Z_OK)
+      {
+         /* check to see if we need more room */
+         if (!(png_ptr->zstream.avail_out))
+         {
+            png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size);
+            png_ptr->zstream.next_out = png_ptr->zbuf;
+            png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+         }
+      }
+      else if (ret != Z_STREAM_END)
       {
          if (png_ptr->zstream.msg != NULL)
             png_error(png_ptr, png_ptr->zstream.msg);
          else
             png_error(png_ptr, "zlib error");
       }
-      /* check to see if we need more room */
-      if (!(png_ptr->zstream.avail_out) && ret == Z_OK)
-      {
-         png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size);
-         png_ptr->zstream.next_out = png_ptr->zbuf;
-         png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
-      }
    } while (ret != Z_STREAM_END);
 
    /* write any extra space */
@@ -2495,6 +2613,7 @@ png_write_filtered_row(png_structp png_ptr, png_bytep filtered_row)
    png_debug(1, "in png_write_filtered_row\n");
    png_debug1(2, "filter = %d\n", filtered_row[0]);
    /* set up the zlib input buffer */
+
    png_ptr->zstream.next_in = filtered_row;
    png_ptr->zstream.avail_in = (uInt)png_ptr->row_info.rowbytes + 1;
    /* repeat until we have compressed all the data */
@@ -2547,3 +2666,4 @@ png_write_filtered_row(png_structp png_ptr, png_bytep filtered_row)
    }
 #endif
 }
+#endif /* PNG_WRITE_SUPPORTED */

projects/beos/x86-shared.txt

@@ -0,0 +1,22 @@
+This project builds a shared library version of libpng on x86 BeOS.
+
+It defines PNG_USE_PNGGCCRD, which activates the assembly code in
+pnggccrd.c; this hasn't been extensively tested on BeOS.
+
+To install:
+
+1) build
+
+   Note: As of version 1.0.10, you'll get a fair number of warnings when
+         you compile pnggccrd.c.  As far as I know, these are harmless,
+         but it would be better if someone fixed them.
+
+2) copy and png.h, pngconf.h somewhere; /boot/home/config/include (which
+   you'll have to make) is a good choice
+
+3) copy libpng.so to /boot/home/config/lib
+
+4) build your libpng.so applications (remember to include libz.a as
+   well when you link)
+
+- Chris Herborth, March 27, 2001

projects/beos/x86-static.txt

@@ -0,0 +1,22 @@
+This project builds a static library version of libpng on x86 BeOS.
+
+It defines PNG_USE_PNGGCCRD, which activates the assembly code in
+pnggccrd.c; this hasn't been extensively tested on BeOS.
+
+To install:
+
+1) build
+
+   Note: As of version 1.0.10, you'll get a fair number of warnings when
+         you compile pnggccrd.c.  As far as I know, these are harmless,
+         but it would be better if someone fixed them.
+
+2) copy and png.h, pngconf.h somewhere; /boot/home/config/include (which
+   you'll have to make) is a good choice
+
+3) copy libpng.a to /boot/home/config/lib
+
+4) build your libpng.a applications (remember to include libz.a as
+   well when you link)
+
+- Chris Herborth, March 27, 2001

projects/borland/libpng.bpf

@@ -0,0 +1,22 @@
+USEUNIT("libpng.cpp");
+USEUNIT("..\..\pngwutil.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("..\..\png.c");
+USELIB("zlib.lib");
+//---------------------------------------------------------------------------
+This file is used by the project manager only and should be treated like the project file
+
+
+DllEntryPoint

projects/borland/libpng.bpg

@@ -0,0 +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
+
+

projects/borland/libpng.bpr

@@ -0,0 +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="$(RESFILES)"/>
+    <LIBFILES value="zlib.lib"/>
+    <LIBRARIES value="bcbsmp50.lib dclocx50.lib NMFast50.lib Tee50.lib Vclx50.lib Vcl50.lib"/>
+    <SPARELIBS value="Vcl50.lib Vclx50.lib Tee50.lib NMFast50.lib dclocx50.lib bcbsmp50.lib"/>
+    <PACKAGES value="Vcl50.bpi Vclx50.bpi bcbsmp50.bpi Qrpt50.bpi Vcldb50.bpi Vclbde50.bpi 
+      ibsmp50.bpi vcldbx50.bpi TeeUI50.bpi TeeDB50.bpi Tee50.bpi TeeQR50.bpi 
+      VCLIB50.bpi bcbie50.bpi vclie50.bpi Inetdb50.bpi Inet50.bpi NMFast50.bpi 
+      dclocx50.bpi bcb97axserver50.bpi SIMULUSCOMPONENTS.bpi Simulus2.bpi"/>
+    <PATHCPP value=".;..\.."/>
+    <PATHPAS value=".;"/>
+    <PATHRC value=".;"/>
+    <PATHASM value=".;"/>
+    <DEBUGLIBPATH value="$(BCB)\lib\debug"/>
+    <RELEASELIBPATH value="$(BCB)\lib\release"/>
+    <LINKER value="tlink32"/>
+    <USERDEFINES value="ZLIB_DLL;Z_PREFIX;PNG_BUILD_DLL;PNG_NO_MODULEDEF"/>
+    <SYSDEFINES value="NO_STRICT;_NO_VCL;_RTLDLL"/>
+    <MAINSOURCE value="libpng.bpf"/>
+    <INCLUDEPATH value="..\..;..\..\..\zlib;$(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"/>
+    <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) $(LIBRARIES) import32.lib cw32mti.lib"/>
+  </LINKER>
+  <IDEOPTIONS>
+[Version Info]
+IncludeVerInfo=0
+AutoIncBuild=0
+MajorVer=1
+MinorVer=0
+Release=0
+Build=0
+Debug=0
+PreRelease=0
+Special=0
+Private=0
+DLL=1
+Locale=2057
+CodePage=1252
+
+[Version Info Keys]
+CompanyName=
+FileDescription=
+FileVersion=1.0.0.0
+InternalName=
+LegalCopyright=
+LegalTrademarks=
+OriginalFilename=
+ProductName=
+ProductVersion=
+Comments=
+
+[HistoryLists\hlIncludePath]
+Count=18
+Item0=..\..;..\..\..\zlib;$(BCB)\include
+Item1=..\..;P:\My Documents\Source\PNG+ZLib\zlib;$(BCB)\include
+Item2=..\..;..\Source\ThirdParty\PortableNetworkGraphics\external;..\Source\ThirdParty\PortableNetworkGraphics;..\Source\ThirdParty\ZLibCompression\external;$(BCB)\include
+Item3=..\Source\ThirdParty\PortableNetworkGraphics\external;..\Source\ThirdParty\PortableNetworkGraphics;..\Source\ThirdParty\ZLibCompression\external;$(BCB)\include
+Item4=..\Source\ThirdParty\PortableNetworkGraphics\external;..\Source\ThirdParty\PortableNetworkGraphics;..\Source\ThirdParty\ZLibCompression;$(BCB)\include
+Item5=..\Source\ThirdParty\PortableNetworkGraphics;..\Source\ThirdParty\ZLibCompression;$(BCB)\include
+Item6=..\Source\ThirdParty\PortableNetworkGraphics;P:\Development\Source\ThirdParty\ZLibCompression;$(BCB)\include
+Item7=..\Source\ThirdParty\PortableNetworkGraphics;$(BCB)\include
+Item8=$(BCB)\include
+Item9=..\Source;..\Source\General\Templates;..\Source\SIMUtilities;$(BCB)\include;$(BCB)\include\vcl
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+Item15=P:\Development\Source\General\Templates;$(BCB)\include;$(BCB)\include\vcl
+Item16=P:\Development\Source;$(BCB)\include;$(BCB)\include\vcl
+Item17=$(BCB)\include;$(BCB)\include\vcl
+
+[HistoryLists\hlLibraryPath]
+Count=10
+Item0=..\..;$(BCB)\lib\obj;$(BCB)\lib
+Item1=..\..;..\Source\ThirdParty\PortableNetworkGraphics\external;..\Source\ThirdParty\PortableNetworkGraphics;$(BCB)\lib\obj;$(BCB)\lib
+Item2=..\Source\ThirdParty\PortableNetworkGraphics\external;..\Source\ThirdParty\PortableNetworkGraphics;$(BCB)\lib\obj;$(BCB)\lib
+Item3=..\Source\ThirdParty\PortableNetworkGraphics;$(BCB)\lib\obj;$(BCB)\lib
+Item4=$(BCB)\lib\obj;$(BCB)\lib
+Item5=..\Source\SIMUtilities;..\Source;$(BCB)\lib\obj;$(BCB)\lib
+Item6=P:\Development\Source\SIMUtilities\;P:\Development\Source\;$(BCB)\lib\obj;$(BCB)\lib
+Item7=P:\Development\Source\SIMUtilities;P:\Development\Source\;$(BCB)\lib\obj;$(BCB)\lib
+Item8=P:\Development\Source\;$(BCB)\lib\obj;$(BCB)\lib
+Item9=P:\Development\Source;$(BCB)\lib\obj;$(BCB)\lib
+
+[HistoryLists\hlDebugSourcePath]
+Count=1
+Item0=$(BCB)\source\vcl
+
+[HistoryLists\hlConditionals]
+Count=20
+Item0=ZLIB_DLL;Z_PREFIX;PNG_BUILD_DLL;PNG_NO_MODULEDEF
+Item1=_DEBUG;ZLIB_DLL;Z_PREFIX;PNG_BUILD_DLL;PNG_NO_MODULEDEF
+Item2=PNG_BUILD_DLL;ZLIB_DLL;_DEBUG;PNG_NO_MODULEDEF
+Item3=PNG_BUILD_DLL;ZLIB_DLL;_DEBUG;PNG_DEBUG=5;PNG_NO_MODULEDEF;PNG_NO_GLOBAL_ARRAYS
+Item4=PNG_BUILD_DLL;ZLIB_DLL;_DEBUG;PNG_DEBUG=5;PNG_NO_MODULEDEF;PNG_SETJMP_NOT_SUPPORTED;PNG_DEBUG_FILE=stderr
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+Item7=PNG_BUILD_DLL;ZLIB_DLL;_DEBUG;PNG_DEBUG=5;PNG_NO_MODULEDEF
+Item8=PNG_BUILD_DLL;ZLIB_DLL;_DEBUG;PNG_DEBUG=5
+Item9=PNG_BUILD_DLL;ZLIB_DLL;_DEBUG
+Item10=PNG_BUILD_DLL;ZLIB_DLL
+Item11=PNG_BUILD_DLL
+Item12=PNG_DLL;PNG_BUILD_DLL;ZLIB_DLL
+Item13=PNG_DLL;PNG_BUILD_DLL;PNG_NO_GLOBAL_ARRAYS;ZLIB_DLL
+Item14=PNG_DLL;PNG_BUILD_DLL;PNG_NO_GLOBAL_ARRAYS
+Item15=PNG_DLL;PNG_BUILD_DLL
+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/borland/libpng.cpp

@@ -0,0 +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;
+}
+//---------------------------------------------------------------------------
+ 

projects/borland/libpng.readme.txt

@@ -0,0 +1,19 @@
+Project files to build libpng using Borland C++ Builder v5.0
+
+To use this dll, you will need to:
+
+1) add the following conditional defines to your project
+
+PNG_USE_DLL
+Z_PREFIX
+
+2) add the paths to png.h and zlib.h to your include path
+
+3) add libpng.lib or libpngstat.lib to the project.
+
+If you are using libpng.dll, libpng.dll and zlib.dll will be required for the code to run.
+
+Alternatively, the libpng.dll can be built using zlibstat.lib to produce one dll containing both the zlib and png code.
+
+See the libpng documentation for instructions on how to use the code.
+

projects/borland/libpngstat.bpf

@@ -0,0 +1,22 @@
+USELIB("zlibstat.lib");
+USEUNIT("..\..\pngerror.c");
+USEUNIT("..\..\png.c");
+USEUNIT("..\..\pngwutil.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("..\..\pngget.c");
+//---------------------------------------------------------------------------
+#define Library
+
+// To add a file to the library use the Project menu 'Add to Project'.
+
+ 

projects/borland/libpngstat.bpr

@@ -0,0 +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="$(RESFILES)"/>
+    <LIBFILES value="zlibstat.lib"/>
+    <LIBRARIES value=""/>
+    <PACKAGES value=""/>
+    <PATHCPP value=".;..\.."/>
+    <PATHPAS value=".;"/>
+    <PATHRC value=".;"/>
+    <PATHASM value=".;"/>
+    <LINKER value="TLib"/>
+    <USERDEFINES value=""/>
+    <SYSDEFINES value="_RTLDLL;NO_STRICT"/>
+    <MAINSOURCE value="libpngstat.bpf"/>
+    <INCLUDEPATH value="..\..;..\..\..\zlib;$(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/borland/zlib+libpng.bpg

@@ -0,0 +1,33 @@
+#------------------------------------------------------------------------------
+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 = zlibstat.lib libpngstat.lib zlib.dll libpng.dll
+#------------------------------------------------------------------------------
+default: $(PROJECTS)
+#------------------------------------------------------------------------------
+
+libpng.dll: libpng.bpr
+  $(ROOT)\bin\bpr2mak $**
+  $(ROOT)\bin\make -$(MAKEFLAGS) -f$*.mak
+
+zlibstat.lib: zlibstat.bpr
+  $(ROOT)\bin\bpr2mak -t$(ROOT)\bin\deflib.bmk $**
+  $(ROOT)\bin\make -$(MAKEFLAGS) -f$*.mak
+
+zlib.dll: zlib.bpr
+  $(ROOT)\bin\bpr2mak $**
+  $(ROOT)\bin\make -$(MAKEFLAGS) -f$*.mak
+
+libpngstat.lib: libpngstat.bpr
+  $(ROOT)\bin\bpr2mak -t$(ROOT)\bin\deflib.bmk $**
+  $(ROOT)\bin\make -$(MAKEFLAGS) -f$*.mak
+
+

projects/borland/zlib.bpf

@@ -0,0 +1,20 @@
+USEUNIT("zlib.cpp");
+USEUNIT("..\..\..\zlib\zutil.c");
+USEUNIT("..\..\..\zlib\compress.c");
+USEUNIT("..\..\..\zlib\crc32.c");
+USEUNIT("..\..\..\zlib\deflate.c");
+USEUNIT("..\..\..\zlib\gzio.c");
+USEUNIT("..\..\..\zlib\infblock.c");
+USEUNIT("..\..\..\zlib\infcodes.c");
+USEUNIT("..\..\..\zlib\inffast.c");
+USEUNIT("..\..\..\zlib\inflate.c");
+USEUNIT("..\..\..\zlib\inftrees.c");
+USEUNIT("..\..\..\zlib\infutil.c");
+USEUNIT("..\..\..\zlib\trees.c");
+USEUNIT("..\..\..\zlib\uncompr.c");
+USEUNIT("..\..\..\zlib\adler32.c");
+//---------------------------------------------------------------------------
+This file is used by the project manager only and should be treated like the project file
+
+
+DllEntryPoint

projects/borland/zlib.bpg

@@ -0,0 +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 = zlibstat.lib zlib.dll
+#------------------------------------------------------------------------------
+default: $(PROJECTS)
+#------------------------------------------------------------------------------
+
+zlibstat.lib: zlibstat.bpr
+  $(ROOT)\bin\bpr2mak -t$(ROOT)\bin\deflib.bmk $**
+  $(ROOT)\bin\make -$(MAKEFLAGS) -f$*.mak
+
+zlib.dll: zlib.bpr
+  $(ROOT)\bin\bpr2mak $**
+  $(ROOT)\bin\make -$(MAKEFLAGS) -f$*.mak
+
+

projects/borland/zlib.bpr

@@ -0,0 +1,147 @@
+<?xml version='1.0' encoding='utf-8' ?>
+<!-- C++Builder XML Project -->
+<PROJECT>
+  <MACROS>
+    <VERSION value="BCB.05.03"/>
+    <PROJECT value="zlib.dll"/>
+    <OBJFILES value="zlib.obj ..\..\..\zlib\zutil.obj ..\..\..\zlib\compress.obj 
+      ..\..\..\zlib\crc32.obj ..\..\..\zlib\deflate.obj ..\..\..\zlib\gzio.obj 
+      ..\..\..\zlib\infblock.obj ..\..\..\zlib\infcodes.obj 
+      ..\..\..\zlib\inffast.obj ..\..\..\zlib\inflate.obj 
+      ..\..\..\zlib\inftrees.obj ..\..\..\zlib\infutil.obj 
+      ..\..\..\zlib\trees.obj ..\..\..\zlib\uncompr.obj ..\..\..\zlib\adler32.obj"/>
+    <RESFILES value=""/>
+    <DEFFILE value=""/>
+    <RESDEPEN value="$(RESFILES)"/>
+    <LIBFILES value=""/>
+    <LIBRARIES value="bcbsmp50.lib dclocx50.lib NMFast50.lib Tee50.lib Vclx50.lib Vcl50.lib"/>
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+      ibsmp50.bpi vcldbx50.bpi TeeUI50.bpi TeeDB50.bpi Tee50.bpi TeeQR50.bpi 
+      VCLIB50.bpi bcbie50.bpi vclie50.bpi Inetdb50.bpi Inet50.bpi NMFast50.bpi 
+      dclocx50.bpi bcb97axserver50.bpi SIMULUSCOMPONENTS.bpi Simulus2.bpi"/>
+    <PATHCPP value=".;..\..\..\zlib"/>
+    <PATHPAS value=".;"/>
+    <PATHRC value=".;"/>
+    <PATHASM value=".;"/>
+    <DEBUGLIBPATH value="$(BCB)\lib\debug"/>
+    <RELEASELIBPATH value="$(BCB)\lib\release"/>
+    <LINKER value="tlink32"/>
+    <USERDEFINES value="ZLIB_DLL;Z_PREFIX"/>
+    <SYSDEFINES value="NO_STRICT;_NO_VCL;_RTLDLL"/>
+    <MAINSOURCE value="zlib.bpf"/>
+    <INCLUDEPATH value="..\..\..\zlib;$(BCB)\include"/>
+    <LIBPATH value="..\..\..\zlib;$(BCB)\lib\obj;$(BCB)\lib"/>
+    <WARNINGS value="-w8092 -w8091 -w8090 -w8089 -w8087 -wprc -wuse -wucp -wstv -wstu -wpin 
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+  </MACROS>
+  <OPTIONS>
+    <CFLAG1 value="-WD -O2 -w -Vx -Ve -x- -RT- -ff -X- -a8 -5 -b- -d -k- -vi -tWD -tWM -c"/>
+    <PFLAGS value="-$Y- -$L- -$D- -$C- -v -JPHNE -M"/>
+    <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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+AutoIncBuild=0
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+</PROJECT>

projects/borland/zlib.cpp

@@ -0,0 +1,30 @@
+//---------------------------------------------------------------------------
+
+#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/borland/zlibstat.bpf

@@ -0,0 +1,20 @@
+USEUNIT("..\..\..\zlib\zutil.c");
+USEUNIT("..\..\..\zlib\compress.c");
+USEUNIT("..\..\..\zlib\crc32.c");
+USEUNIT("..\..\..\zlib\deflate.c");
+USEUNIT("..\..\..\zlib\gzio.c");
+USEUNIT("..\..\..\zlib\infblock.c");
+USEUNIT("..\..\..\zlib\infcodes.c");
+USEUNIT("..\..\..\zlib\inffast.c");
+USEUNIT("..\..\..\zlib\inflate.c");
+USEUNIT("..\..\..\zlib\inftrees.c");
+USEUNIT("..\..\..\zlib\infutil.c");
+USEUNIT("..\..\..\zlib\trees.c");
+USEUNIT("..\..\..\zlib\uncompr.c");
+USEUNIT("..\..\..\zlib\adler32.c");
+//---------------------------------------------------------------------------
+#define Library
+
+// To add a file to the library use the Project menu 'Add to Project'.
+
+ 

projects/borland/zlibstat.bpr

@@ -0,0 +1,131 @@
+<?xml version='1.0' encoding='utf-8' ?>
+<!-- C++Builder XML Project -->
+<PROJECT>
+  <MACROS>
+    <VERSION value="BCB.05.03"/>
+    <PROJECT value="zlibstat.lib"/>
+    <OBJFILES value="..\..\..\zlib\zutil.obj ..\..\..\zlib\compress.obj ..\..\..\zlib\crc32.obj 
+      ..\..\..\zlib\deflate.obj ..\..\..\zlib\gzio.obj 
+      ..\..\..\zlib\infblock.obj ..\..\..\zlib\infcodes.obj 
+      ..\..\..\zlib\inffast.obj ..\..\..\zlib\inflate.obj 
+      ..\..\..\zlib\inftrees.obj ..\..\..\zlib\infutil.obj 
+      ..\..\..\zlib\trees.obj ..\..\..\zlib\uncompr.obj ..\..\..\zlib\adler32.obj"/>
+    <RESFILES value=""/>
+    <DEFFILE value=""/>
+    <RESDEPEN value="$(RESFILES)"/>
+    <LIBFILES value=""/>
+    <LIBRARIES value=""/>
+    <PACKAGES value=""/>
+    <PATHCPP value=".;..\..\..\zlib"/>
+    <PATHPAS value=".;"/>
+    <PATHRC value=".;"/>
+    <PATHASM value=".;"/>
+    <LINKER value="TLib"/>
+    <USERDEFINES value="Z_PREFIX"/>
+    <SYSDEFINES value="_RTLDLL;NO_STRICT"/>
+    <MAINSOURCE value="zlibstat.bpf"/>
+    <INCLUDEPATH value="..\..\..\zlib;$(BCB)\include"/>
+    <LIBPATH value="..\..\..\zlib;$(BCB)\lib\obj;$(BCB)\lib"/>
+    <WARNINGS value="-w8092 -w8091 -w8090 -w8089 -w8087 -wprc -wuse -wucp -wstv -wstu -wpin 
+      -wnod -wnak -wdef -wcln -wbbf -w-aus -wasm -wamp -wamb"/>
+    <LISTFILE value=""/>
+  </MACROS>
+  <OPTIONS>
+    <CFLAG1 value="-O2 -w -Vx -Ve -x- -RT- -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=""/>
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+  <LINKER>
+    <ALLOBJ value="$(OBJFILES)"/>
+    <ALLLIB value=""/>
+  </LINKER>
+  <IDEOPTIONS>
+[Version Info]
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+[Language]
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+</PROJECT>

projects/msvc/README.txt

@@ -0,0 +1,47 @@
+Microsoft Developer Studio Build File, Format Version 6.00 for
+libpng 1.2.1beta3 (October 27, 2001) and zlib
+
+Copyright (C) 2000 Simon-Pierre Cadieux
+For conditions of distribution and use, see copyright notice in png.h
+
+Assumes that libpng sources are in ..\..
+Assumes that zlib sources have been copied to ..\..\..\zlib
+
+To build:
+
+1) On the main menu Select "Build|Set Active configuration". 
+   Among the configurations beginning with "libpng" select the 
+   one you wish to build (the corresponding "zlib" configuration
+   will be built automatically).
+
+2) Select "Build|Clean"
+
+3) Select "Build|Rebuild All"
+
+4) Look in the appropriate "win32" subdirectories for both "zlib"
+   and "libpng" binaries.
+
+This project will build the PNG Development Group's "official" versions of
+libpng and zlib libraries:
+
+   libpng3.dll          (default version, currently C code only)
+   libpng3.dll         (C + Assembler version)
+   libpng3.dll         (C + Assembler debug version)
+   libpng3.dll         (C code debug version)
+   libpng3[c,e-m].dll   (reserved for official versions) 
+   libpng3[n-z].dll     (available for private versions)
+   zlib.dll             (default version, currently C code only)
+   zlibd.dll            (debug version)
+
+If you change anything in libpng, or select different compiler settings,
+please change the library name to an unreserved name, and define
+DLLFNAME_POSTFIX and (PRIVATEBUILD or SPECIALBUILD) accordingly. DLLFNAME_POSTFIX
+should correspond to a string in the range of "N" to "Z" depending on the letter 
+you choose for your private version.
+
+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
+above mentioned libraries you should also include this DLL in your package.
+For a list of files that are redistributable in Visual C++ 6.0, see
+Common\Redist\Redist.txt on Disc 1 of the Visual C++ 6.0 product CDs. 
+

projects/msvc/libpng.dsp

@@ -0,0 +1,367 @@
+# 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
+!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"
+!MESSAGE 
+!MESSAGE Possible choices for configuration are:
+!MESSAGE 
+!MESSAGE "libpng - Win32 DLL" (based on "Win32 (x86) Dynamic-Link Library")
+!MESSAGE "libpng - Win32 DLL Debug" (based on "Win32 (x86) Dynamic-Link Library")
+!MESSAGE "libpng - Win32 DLL ASM" (based on "Win32 (x86) Dynamic-Link Library")
+!MESSAGE "libpng - Win32 DLL Debug ASM" (based on "Win32 (x86) Dynamic-Link Library")
+!MESSAGE "libpng - Win32 LIB" (based on "Win32 (x86) Static Library")
+!MESSAGE "libpng - Win32 LIB Debug" (based on "Win32 (x86) Static Library")
+!MESSAGE 
+
+# Begin Project
+# PROP AllowPerConfigDependencies 0
+# PROP Scc_ProjName ""
+# PROP Scc_LocalPath ""
+
+!IF  "$(CFG)" == "libpng - Win32 DLL"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "Release"
+# PROP BASE Intermediate_Dir "Release"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir ".\win32\libpng\dll"
+# PROP Intermediate_Dir ".\win32\libpng\dll"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+CPP=cl.exe
+# ADD BASE CPP /nologo /MD /W3 /O1 /D "NDEBUG" /D "WIN32" /D "_WINDOWS" /D "_USRDLL" /FD /c
+# ADD CPP /nologo /MD /W3 /O1 /I "..\.." /I "..\..\..\zlib" /D "NDEBUG" /D "WIN32" /D "_WINDOWS" /D "PNG_BUILD_DLL" /D "ZLIB_DLL" /Yu"png.h" /FD /c
+MTL=midl.exe
+RSC=rc.exe
+# ADD BASE RSC /l 0x409 /d "NDEBUG"
+# ADD RSC /l 0x409 /i "..\.." /d "NDEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 /nologo /dll /machine:I386
+# ADD LINK32 /nologo /dll /machine:I386 /out:".\win32\libpng\dll\libpng3.dll"
+# SUBTRACT LINK32 /pdb:none
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL Debug"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 1
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+# PROP BASE Intermediate_Dir "Debug"
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+MTL=midl.exe
+RSC=rc.exe
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+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 /nologo /dll /debug /machine:I386 /pdbtype:sept
+# ADD LINK32 /nologo /dll /debug /machine:I386 /out:".\win32\libpng\dll_dbg\libpng3d.dll"
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL ASM"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "Release"
+# PROP BASE Intermediate_Dir "Release"
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+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir ".\win32\libpng\dll_asm"
+# PROP Intermediate_Dir ".\win32\libpng\dll_asm"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+CPP=cl.exe
+# ADD BASE CPP /nologo /MD /W3 /O1 /D "NDEBUG" /D "WIN32" /D "_WINDOWS" /D "_USRDLL" /FD /c
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+RSC=rc.exe
+# ADD BASE RSC /l 0x409 /d "NDEBUG"
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+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 /nologo /dll /machine:I386
+# ADD LINK32 /nologo /dll /machine:I386 /out:".\win32\libpng\dll_asm\libpng3a.dll"
+# SUBTRACT LINK32 /pdb:none
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL Debug ASM"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 1
+# PROP BASE Output_Dir "Debug"
+# PROP BASE Intermediate_Dir "Debug"
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+# ADD BASE CPP /nologo /MDd /W3 /Zi /Od /D "_DEBUG" /D "WIN32" /D "_WINDOWS" /D "_USRDLL" /FD /GZ /c
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+# ADD BASE RSC /l 0x409 /d "_DEBUG"
+# ADD RSC /l 0x409 /i "..\.." /d "_DEBUG" /d PNG_DEBUG=1  /d "PNG_USE_PNGVCRD"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 /nologo /dll /debug /machine:I386 /pdbtype:sept
+# ADD LINK32 /nologo /dll /debug /machine:I386 /out:".\win32\libpng\dll_dbga\libpng3b.dll"
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 LIB"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "Release"
+# PROP BASE Intermediate_Dir "Release"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir ".\win32\libpng\lib"
+# PROP Intermediate_Dir ".\win32\libpng\lib"
+# PROP Target_Dir ""
+MTL=midl.exe
+CPP=cl.exe
+# ADD BASE CPP /nologo /W3 /O1 /D "WIN32" /D "NDEBUG" /D "_LIB" /FD /c
+# ADD CPP /nologo /W3 /O1 /I "..\.." /I "..\..\..\zlib" /D "WIN32" /D "NDEBUG" /Yu"png.h" /FD /c
+RSC=rc.exe
+# ADD BASE RSC /l 0x409 /d "NDEBUG"
+# ADD RSC /l 0x409 /i "..\.." /d "NDEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LIB32=link.exe -lib
+# ADD BASE LIB32 /nologo
+# ADD LIB32 /nologo
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 LIB Debug"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 1
+# PROP BASE Output_Dir "Debug"
+# PROP BASE Intermediate_Dir "Debug"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 1
+# PROP Output_Dir ".\win32\libpng\lib_dbg"
+# PROP Intermediate_Dir ".\win32\libpng\lib_dbg"
+# PROP Target_Dir ""
+MTL=midl.exe
+CPP=cl.exe
+# ADD BASE CPP /nologo /W3 /Zi /Od /D "_DEBUG" /D "WIN32" /D "_LIB" /FD /GZ /c
+# ADD CPP /nologo /W3 /Zi /Od /I "..\.." /I "..\..\..\zlib" /D "DEBUG" /D "_DEBUG" /D PNG_DEBUG=1 /D "WIN32" /Yu"png.h" /FD /GZ /c
+RSC=rc.exe
+# ADD BASE RSC /l 0x409 /d "_DEBUG"
+# ADD RSC /l 0x409 /d "_DEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LIB32=link.exe -lib
+# ADD BASE LIB32 /nologo
+# ADD LIB32 /nologo
+
+!ENDIF 
+
+# Begin Target
+
+# Name "libpng - Win32 DLL"
+# Name "libpng - Win32 DLL Debug"
+# Name "libpng - Win32 DLL ASM"
+# Name "libpng - Win32 DLL Debug ASM"
+# Name "libpng - Win32 LIB"
+# Name "libpng - Win32 LIB Debug"
+# Begin Group "Source Files"
+
+# PROP Default_Filter "cpp;c;cxx;rc;def;r;odl;idl;hpj;bat"
+# Begin Source File
+
+SOURCE=..\..\png.c
+# SUBTRACT CPP /YX /Yc /Yu
+# End Source File
+# Begin Source File
+
+SOURCE=.\png.rc
+
+!IF  "$(CFG)" == "libpng - Win32 DLL"
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL Debug"
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL ASM"
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL Debug ASM"
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 LIB"
+
+# PROP Exclude_From_Build 1
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 LIB Debug"
+
+# PROP Exclude_From_Build 1
+
+!ENDIF 
+
+# End Source File
+# Begin Source File
+
+SOURCE=.\png32ms.def
+
+!IF  "$(CFG)" == "libpng - Win32 DLL"
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL Debug"
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL ASM"
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL Debug ASM"
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 LIB"
+
+# PROP Exclude_From_Build 1
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 LIB Debug"
+
+# PROP Exclude_From_Build 1
+
+!ENDIF 
+
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngerror.c
+# ADD CPP /Yc"png.h"
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngget.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngmem.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngpread.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngread.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngrio.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngrtran.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngrutil.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngset.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngtrans.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngvcrd.c
+
+!IF  "$(CFG)" == "libpng - Win32 DLL"
+
+# PROP Exclude_From_Build 1
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL Debug"
+
+# PROP Exclude_From_Build 1
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL ASM"
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 DLL Debug ASM"
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 LIB"
+
+# PROP Exclude_From_Build 1
+
+!ELSEIF  "$(CFG)" == "libpng - Win32 LIB Debug"
+
+# PROP Exclude_From_Build 1
+
+!ENDIF 
+
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngwio.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngwrite.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngwtran.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngwutil.c
+# End Source File
+# End Group
+# Begin Group "Header Files"
+
+# PROP Default_Filter "h;hpp;hxx;hm;inl"
+# Begin Source File
+
+SOURCE=..\..\png.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\pngconf.h
+# End Source File
+# End Group
+# Begin Group "Resource Files"
+
+# PROP Default_Filter "ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe"
+# End Group
+# Begin Source File
+
+SOURCE=.\readme.txt
+# PROP Exclude_From_Build 1
+# End Source File
+# End Target
+# End Project

projects/msvc/libpng.dsw

@@ -0,0 +1,44 @@
+Microsoft Developer Studio Workspace File, Format Version 6.00
+# WARNING: DO NOT EDIT OR DELETE THIS WORKSPACE FILE!
+
+###############################################################################
+
+Project: "libpng"=.\libpng.dsp - Package Owner=<4>
+
+Package=<5>
+{{{
+}}}
+
+Package=<4>
+{{{
+    Begin Project Dependency
+    Project_Dep_Name zlib
+    End Project Dependency
+}}}
+
+###############################################################################
+
+Project: "zlib"=.\zlib.dsp - Package Owner=<4>
+
+Package=<5>
+{{{
+}}}
+
+Package=<4>
+{{{
+}}}
+
+###############################################################################
+
+Global:
+
+Package=<5>
+{{{
+}}}
+
+Package=<3>
+{{{
+}}}
+
+###############################################################################
+

projects/msvc/png.rc

@@ -0,0 +1,100 @@
+#define PNG_VERSION_INFO_ONLY
+
+#include <windows.h>
+#include "png.h"
+
+#define _QUOTE(x) # x
+#define QUOTE(x) _QUOTE(x)
+
+#define PNG_LIBPNG_DLLFNAME "LIBPNG"
+
+#if defined(DLLFNAME_POSTFIX) && !defined(PRIVATEBUILD) && !defined(SPECIALBUILD)
+#  error PRIVATEBUILD or SPECIALBUILD must be defined as a string describing the type of change brought to the standard library
+#endif /* defined(DLLFNAME_POSTFIX)... */
+
+#if !defined(DLLFNAME_POSTFIX) && defined(PNG_USE_PNGVCRD)
+#  if defined(PNG_DEBUG) && (PNG_DEBUG > 0)
+#    define DLLFNAME_POSTFIX "B"
+#  else
+#    define DLLFNAME_POSTFIX "A"
+#  endif /* !defined(DLLFNAME_POSTFIX)... */
+#  if !defined(SPECIALBUILD)
+#    define SPECIALBUILD "Use MMX instructions"
+#  endif /* SPECIALBUILD */
+#endif
+
+#if defined(PNG_DEBUG) && (PNG_DEBUG > 0)
+#  define VS_DEBUG VS_FF_DEBUG
+#  ifndef DLLFNAME_POSTFIX
+#    define DLLFNAME_POSTFIX "D"
+#  endif /* DLLFNAME_POSTFIX */
+#  ifndef COMMENTS 
+#    define COMMENTS "PNG_DEBUG=" QUOTE(PNG_DEBUG)
+#  endif /* COMMENTS */
+#else
+#  define VS_DEBUG 0
+#  ifndef DLLFNAME_POSTFIX
+#     define DLLFNAME_POSTFIX
+#  endif /* DLLFNAME_POSTFIX */
+#endif /* defined(DEBUG)... */
+
+#ifdef PRIVATEBUILD
+#  define VS_PRIVATEBUILD VS_FF_PRIVATEBUILD
+#else
+#  define VS_PRIVATEBUILD 0
+#endif /* PRIVATEBUILD */
+
+#ifdef SPECIALBUILD
+#  define VS_SPECIALBUILD VS_FF_SPECIALBUILD
+#else
+#  define VS_SPECIALBUILD 0
+#endif /* SPECIALBUILD */
+
+#if ((PNG_LIBPNG_BUILD_TYPE & PNG_LIBPNG_BUILD_TYPEMASK) != \
+      PNG_LIBPNG_BUILD_STABLE)
+#  define VS_PRERELEASE VS_FF_PRERELEASE
+#  define VS_PATCHED 0
+#else
+#  define VS_PRERELEASE 0
+#  if (PNG_LIBPNG_BUILD_TYPE & PNG_LIBPNG_BUILD_PATCHED)
+#    define VS_PATCHED VS_FF_PATCHED
+#  else
+#    define VS_PATCHED 0
+#  endif
+#endif
+
+VS_VERSION_INFO VERSIONINFO 
+FILEVERSION PNG_LIBPNG_VER_MAJOR, PNG_LIBPNG_VER_MINOR, PNG_LIBPNG_VER_RELEASE, PNG_LIBPNG_VER_BUILD
+PRODUCTVERSION PNG_LIBPNG_VER_MAJOR, PNG_LIBPNG_VER_MINOR, PNG_LIBPNG_VER_RELEASE, PNG_LIBPNG_VER_BUILD
+FILEFLAGSMASK VS_FFI_FILEFLAGSMASK
+FILEFLAGS VS_DEBUG | VS_PRIVATEBUILD | VS_SPECIALBUILD | VS_PRERELEASE | VS_PATCHED
+FILEOS VOS__WINDOWS32
+FILETYPE VFT_DLL
+FILESUBTYPE VFT2_UNKNOWN
+BEGIN
+  BLOCK "StringFileInfo"
+  BEGIN BLOCK "040904E4" /* Language type = U.S English(0x0409) and Character Set = Windows, Multilingual(0x04E4) */
+    BEGIN
+#ifdef COMMENTS
+      VALUE "Comments", COMMENTS "\000"
+#endif /* COMMENTS */
+      VALUE "FileDescription", "PNG image compression library\000"
+      VALUE "FileVersion", PNG_LIBPNG_VER_STRING "\000"
+      VALUE "InternalName", PNG_LIBPNG_DLLFNAME QUOTE(PNG_LIBPNG_VER_MAJOR) DLLFNAME_POSTFIX " (Windows 32 bit)\000"
+      VALUE "LegalCopyright", "\251 1998-2000 Glenn Randers-Pehrson\000"
+      VALUE "OriginalFilename", PNG_LIBPNG_DLLFNAME QUOTE(PNG_LIBPNG_VER_MAJOR) DLLFNAME_POSTFIX ".DLL\000"
+#ifdef PRIVATEBUILD
+      VALUE "PrivateBuild", PRIVATEBUILD
+#endif /* PRIVATEBUILD */
+      VALUE "ProductName", "LibPNG\000"
+      VALUE "ProductVersion", "1\000"
+#ifdef SPECIALBUILD
+      VALUE "SpecialBuild", SPECIALBUILD
+#endif /* SPECIALBUILD */
+    END
+  END
+  BLOCK "VarFileInfo"
+  BEGIN
+    VALUE "Translation", 0x0409, 0x04E4
+  END
+END

projects/msvc/png32ms.def

@@ -0,0 +1,213 @@
+;------------------------------------------
+; LIBPNG module definition file for Windows
+;------------------------------------------
+
+LIBRARY
+DESCRIPTION "PNG image compression library for Windows"
+
+EXPORTS
+;Version 1.2.1beta3
+  png_build_grayscale_palette  @1
+  png_check_sig        @2
+  png_chunk_error      @3
+  png_chunk_warning      @4
+  png_convert_from_struct_tm   @5
+  png_convert_from_time_t    @6
+  png_create_info_struct     @7
+  png_create_read_struct     @8
+  png_create_write_struct    @9
+  png_data_freer    @10
+  png_destroy_info_struct  @11
+  png_destroy_read_struct  @12
+  png_destroy_write_struct  @13
+  png_error    @14
+  png_free      @15
+  png_free_data    @16
+  png_get_IHDR    @17
+  png_get_PLTE    @18
+  png_get_bKGD    @19
+  png_get_bit_depth    @20
+  png_get_cHRM    @21
+  png_get_cHRM_fixed  @22
+  png_get_channels    @23
+  png_get_color_type  @24
+  png_get_compression_buffer_size  @25
+  png_get_compression_type  @26
+  png_get_copyright    @27
+  png_get_error_ptr    @28
+  png_get_filter_type  @29
+  png_get_gAMA    @30
+  png_get_gAMA_fixed  @31
+  png_get_hIST    @32
+  png_get_header_ver  @33
+  png_get_header_version  @34
+  png_get_iCCP    @35
+  png_get_image_height  @36
+  png_get_image_width  @37
+  png_get_interlace_type  @38
+  png_get_io_ptr    @39
+  png_get_libpng_ver  @40
+  png_get_oFFs    @41
+  png_get_pCAL    @42
+  png_get_pHYs    @43
+  png_get_pixel_aspect_ratio  @44
+  png_get_pixels_per_meter  @45
+  png_get_progressive_ptr  @46
+  png_get_rgb_to_gray_status  @47
+  png_get_rowbytes    @48
+  png_get_rows    @49
+  png_get_sBIT    @50
+  png_get_sCAL    @51
+  png_get_sPLT    @52
+  png_get_sRGB    @53
+  png_get_signature    @54
+  png_get_tIME    @55
+  png_get_tRNS    @56
+  png_get_text    @57
+  png_get_unknown_chunks  @58
+  png_get_user_chunk_ptr  @59
+  png_get_user_transform_ptr  @60
+  png_get_valid    @61
+  png_get_x_offset_microns  @62
+  png_get_x_offset_pixels  @63
+  png_get_x_pixels_per_meter  @64
+  png_get_y_offset_microns  @65
+  png_get_y_offset_pixels  @66
+  png_get_y_pixels_per_meter  @67
+  png_malloc    @68
+  png_memcpy_check    @69
+  png_memset_check    @70
+; png_permit_empty_plte is deprecated
+  png_permit_empty_plte  @71
+  png_process_data    @72
+  png_progressive_combine_row  @73
+  png_read_end    @74
+  png_read_image    @75
+  png_read_info    @76
+; png_read_init is deprecated
+  png_read_init    @77
+  png_read_png    @78
+  png_read_row    @79
+  png_read_rows    @80
+  png_read_update_info  @81
+  png_reset_zstream    @82
+  png_set_IHDR    @83
+  png_set_PLTE    @84
+  png_set_bKGD    @85
+  png_set_background  @86
+  png_set_bgr    @87
+  png_set_cHRM    @88
+  png_set_cHRM_fixed  @89
+  png_set_compression_buffer_size  @90
+  png_set_compression_level  @91
+  png_set_compression_mem_level  @92
+  png_set_compression_method  @93
+  png_set_compression_strategy  @94
+  png_set_compression_window_bits  @95
+  png_set_crc_action  @96
+  png_set_dither    @97
+  png_set_error_fn    @98
+  png_set_expand    @99
+  png_set_filler    @100
+  png_set_filter    @101
+  png_set_filter_heuristics  @102
+  png_set_flush    @103
+  png_set_gAMA    @104
+  png_set_gAMA_fixed  @105
+  png_set_gamma    @106
+  png_set_gray_1_2_4_to_8  @107
+  png_set_gray_to_rgb  @108
+  png_set_hIST    @109
+  png_set_iCCP    @110
+  png_set_interlace_handling  @111
+  png_set_invert_alpha  @112
+  png_set_invert_mono  @113
+  png_set_keep_unknown_chunks  @114
+  png_set_oFFs    @115
+  png_set_pCAL    @116
+  png_set_pHYs    @117
+  png_set_packing    @118
+  png_set_packswap    @119
+  png_set_palette_to_rgb  @120
+  png_set_progressive_read_fn  @121
+  png_set_read_fn    @122
+  png_set_read_status_fn  @123
+  png_set_read_user_chunk_fn  @124
+  png_set_read_user_transform_fn  @125
+  png_set_rgb_to_gray  @126
+  png_set_rgb_to_gray_fixed  @127
+  png_set_rows    @128
+  png_set_sBIT    @129
+  png_set_sCAL    @130
+  png_set_sPLT    @131
+  png_set_sRGB    @132
+  png_set_sRGB_gAMA_and_cHRM  @133
+  png_set_shift    @134
+  png_set_sig_bytes    @135
+  png_set_strip_16    @136
+  png_set_strip_alpha  @137
+  png_set_swap    @138
+  png_set_swap_alpha  @139
+  png_set_tIME    @140
+  png_set_tRNS    @141
+  png_set_tRNS_to_alpha  @142
+  png_set_text    @143
+  png_set_unknown_chunk_location  @144
+  png_set_unknown_chunks  @145
+  png_set_user_transform_info  @146
+  png_set_write_fn    @147
+  png_set_write_status_fn  @148
+  png_set_write_user_transform_fn  @149
+  png_sig_cmp    @150
+  png_start_read_image  @151
+  png_warning    @152
+  png_write_chunk    @153
+  png_write_chunk_data  @154
+  png_write_chunk_end  @155
+  png_write_chunk_start  @156
+  png_write_end    @157
+  png_write_flush    @158
+  png_write_image    @159
+  png_write_info    @160
+  png_write_info_before_PLTE  @161
+; png_write_init is deprecated
+  png_write_init    @162
+  png_write_png    @163
+  png_write_row    @164
+  png_write_rows    @165
+; png_read_init_2 and png_write_init_2 are deprecated.
+  png_read_init_2    @166
+  png_write_init_2    @167
+  png_access_version_number  @168
+;  png_sig_bytes    @169
+;  png_libpng_ver    @170
+  png_init_io    @171
+  png_convert_to_rfc1123     @172
+  png_set_invalid  @173
+; Added at version 1.0.12
+; For compatiblity with 1.0.7-1.0.11
+  png_info_init @174
+  png_read_init_3    @175
+  png_write_init_3    @176
+  png_info_init_3 @177
+  png_destroy_struct  @178
+; Added at version 1.2.0
+; For use with PNG_USER_MEM_SUPPORTED
+  png_destroy_struct_2  @179
+  png_create_read_struct_2 @180
+  png_create_write_struct_2 @181
+  png_malloc_default @182
+  png_free_default @183
+; MNG features
+  png_permit_mng_features  @184
+; MMX support
+  png_mmx_support  @185
+  png_get_mmx_flagmask  @186
+  png_get_asm_flagmask  @187
+  png_get_asm_flags  @188
+  png_get_mmx_bitdepth_threshold  @189
+  png_get_mmx_rowbytes_threshold  @190
+  png_set_asm_flags  @191
+  png_init_mmx_flags  @192
+; Strip error numbers
+  png_set_strip_error_numbers @193

projects/msvc/zlib.def

@@ -0,0 +1,45 @@
+LIBRARY
+DESCRIPTION "zlib compression library for Windows"
+
+EXPORTS
+    adler32                        @1
+    compress                       @2
+    crc32                          @3
+    deflate                        @4
+    deflateCopy                    @5
+    deflateEnd                     @6
+    deflateInit2_                  @7
+    deflateInit_                   @8
+    deflateParams                  @9
+    deflateReset                   @10
+    deflateSetDictionary           @11
+    gzclose                        @12
+    gzdopen                        @13
+    gzerror                        @14
+    gzflush                        @15
+    gzopen                         @16
+    gzread                         @17
+    gzwrite                        @18
+    inflate                        @19
+    inflateEnd                     @20
+    inflateInit2_                  @21
+    inflateInit_                   @22
+    inflateReset                   @23
+    inflateSetDictionary           @24
+    inflateSync                    @25
+    uncompress                     @26
+    zlibVersion                    @27
+    gzprintf                       @28
+    gzputc                         @29
+    gzgetc                         @30
+    gzseek                         @31
+    gzrewind                       @32
+    gztell                         @33
+    gzeof                          @34
+    gzsetparams                    @35
+    zError                         @36
+    inflateSyncPoint               @37
+    get_crc_table                  @38
+    compress2                      @39
+    gzputs                         @40
+    gzgets                         @41

projects/msvc/zlib.dsp

@@ -0,0 +1,400 @@
+# Microsoft Developer Studio Project File - Name="zlib" - 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=zlib - Win32 DLL
+!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 "zlib.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 "zlib.mak" CFG="zlib - Win32 DLL"
+!MESSAGE 
+!MESSAGE Possible choices for configuration are:
+!MESSAGE 
+!MESSAGE "zlib - Win32 DLL" (based on "Win32 (x86) Dynamic-Link Library")
+!MESSAGE "zlib - Win32 DLL Debug" (based on "Win32 (x86) Dynamic-Link Library")
+!MESSAGE "zlib - Win32 DLL ASM" (based on "Win32 (x86) Dynamic-Link Library")
+!MESSAGE "zlib - Win32 DLL Debug ASM" (based on "Win32 (x86) Dynamic-Link Library")
+!MESSAGE "zlib - Win32 LIB" (based on "Win32 (x86) Static Library")
+!MESSAGE "zlib - Win32 LIB Debug" (based on "Win32 (x86) Static Library")
+!MESSAGE 
+
+# Begin Project
+# PROP AllowPerConfigDependencies 0
+# PROP Scc_ProjName ""
+# PROP Scc_LocalPath ""
+
+!IF  "$(CFG)" == "zlib - Win32 DLL"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "Release"
+# PROP BASE Intermediate_Dir "Release"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir ".\win32\zlib\dll"
+# PROP Intermediate_Dir ".\win32\zlib\dll"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+CPP=cl.exe
+# ADD BASE CPP /nologo /MD /W3 /O1 /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /D "_USRDLL" /FD /c
+# ADD CPP /nologo /MD /W3 /O1 /D "NDEBUG" /D "WIN32" /D "_WINDOWS" /D "ZLIB_DLL" /FD /c
+MTL=midl.exe
+RSC=rc.exe
+# ADD BASE RSC /l 0x409 /d "NDEBUG"
+# ADD RSC /l 0x409 /d "NDEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 /nologo /dll /machine:I386
+# ADD LINK32 /nologo /dll /machine:I386
+# SUBTRACT LINK32 /pdb:none
+
+!ELSEIF  "$(CFG)" == "zlib - Win32 DLL Debug"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 1
+# PROP BASE Output_Dir "Debug"
+# PROP BASE Intermediate_Dir "Debug"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 1
+# PROP Output_Dir ".\win32\zlib\dll_dbg"
+# PROP Intermediate_Dir ".\win32\zlib\dll_dbg"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+CPP=cl.exe
+# ADD BASE CPP /nologo /MDd /W3 /Zi /Od /D "WIN32" /D "_DEBUG" /D "_WINDOWS" /D "_USRDLL" /FD /GZ /c
+# ADD CPP /nologo /MDd /W3 /Zi /Od /D "DEBUG" /D "_DEBUG" /D "WIN32" /D "_WINDOWS" /D "ZLIB_DLL" /FD /GZ /c
+MTL=midl.exe
+RSC=rc.exe
+# ADD BASE RSC /l 0x409 /d "_DEBUG"
+# ADD RSC /l 0x409 /d "_DEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 /nologo /dll /debug /machine:I386 /pdbtype:sept
+# ADD LINK32 /nologo /dll /debug /machine:I386 /out:".\win32\zlib\dll_dbg\zlibd.dll"
+
+!ELSEIF  "$(CFG)" == "zlib - Win32 DLL ASM"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "Release"
+# PROP BASE Intermediate_Dir "Release"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir ".\win32\zlib\dll_asm"
+# PROP Intermediate_Dir ".\win32\zlib\dll_asm"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+CPP=cl.exe
+# ADD BASE CPP /nologo /MD /W3 /O1 /D "NDEBUG" /D "WIN32" /D "_WINDOWS" /D "_USRDLL" /FD /c
+# ADD CPP /nologo /MD /W3 /O1 /I "..\..\..\zlib" /D "NDEBUG" /D "WIN32" /D "_WIN32" /D "_WINDOWS" /D "ZLIB_DLL" /D "DYNAMIC_CRC_TABLE" /D "ASMV" /FAcs /FD /c
+MTL=midl.exe
+RSC=rc.exe
+# ADD BASE RSC /l 0x409 /d "NDEBUG"
+# ADD RSC /l 0x409 /i "..\.." /d "NDEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 /nologo /dll /machine:I386
+# ADD LINK32 gvmat32.obj /nologo /dll /machine:I386 /out:".\win32\zlib\dll_asm\zliba.dll"
+# SUBTRACT LINK32 /pdb:none
+
+!ELSEIF  "$(CFG)" == "zlib - Win32 DLL Debug ASM"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 1
+# PROP BASE Output_Dir "Debug"
+# PROP BASE Intermediate_Dir "Debug"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 1
+# PROP Output_Dir ".\win32\zlib\dll_dbga"
+# PROP Intermediate_Dir ".\win32\zlib\dll_dbga"
+# PROP Ignore_Export_Lib 0
+# PROP Target_Dir ""
+CPP=cl.exe
+# ADD BASE CPP /nologo /MDd /W3 /Zi /Od /D "_DEBUG" /D "WIN32" /D "_WINDOWS" /D "_USRDLL" /FD /GZ /c
+# ADD CPP /nologo /MDd /W3 /Zi /Od /I "..\..\..\zlib" /D "_DEBUG" /D "WIN32" /D "_WIN32" /D "_WINDOWS" /D "ZLIB_DLL" /D "DYNAMIC_CRC_TABLE" /D "ASMV" /FAcs /FD /GZ /c
+MTL=midl.exe
+RSC=rc.exe
+# ADD BASE RSC /l 0x409 /d "_DEBUG"
+# ADD RSC /l 0x409 /i "..\.." /d "_DEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LINK32=link.exe
+# ADD BASE LINK32 /nologo /dll /debug /machine:I386 /pdbtype:sept
+# ADD LINK32 gvmat32d.obj /nologo /dll /debug /machine:I386 /out:".\win32\zlib\dll_dbga\zlibb.dll"
+
+!ELSEIF  "$(CFG)" == "zlib - Win32 LIB"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "Release"
+# PROP BASE Intermediate_Dir "Release"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir ".\win32\zlib\lib"
+# PROP Intermediate_Dir ".\win32\zlib\lib"
+# PROP Target_Dir ""
+MTL=midl.exe
+CPP=cl.exe
+# ADD BASE CPP /nologo /W3 /O1 /D "WIN32" /D "NDEBUG" /D "_LIB" /FD /c
+# ADD CPP /nologo /W3 /O1 /D "WIN32" /D "NDEBUG" /FD /c
+RSC=rc.exe
+# ADD BASE RSC /l 0x409 /d "NDEBUG"
+# ADD RSC /l 0x409 /d "NDEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LIB32=link.exe -lib
+# ADD BASE LIB32 /nologo
+# ADD LIB32 /nologo
+
+!ELSEIF  "$(CFG)" == "zlib - Win32 LIB Debug"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 1
+# PROP BASE Output_Dir "Debug"
+# PROP BASE Intermediate_Dir "Debug"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 1
+# PROP Output_Dir ".\win32\zlib\lib_dbg"
+# PROP Intermediate_Dir ".\win32\zlib\lib_dbg"
+# PROP Target_Dir ""
+MTL=midl.exe
+CPP=cl.exe
+# ADD BASE CPP /nologo /W3 /Zi /Od /D "WIN32" /D "_DEBUG" /D "_LIB" /FD /GZ /c
+# ADD CPP /nologo /W3 /Zi /Od /D "WIN32" /D "_DEBUG" /FD /GZ /c
+RSC=rc.exe
+# ADD BASE RSC /l 0x409 /d "_DEBUG"
+# ADD RSC /l 0x409 /d "_DEBUG"
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+LIB32=link.exe -lib
+# ADD BASE LIB32 /nologo
+# ADD LIB32 /nologo
+
+!ENDIF 
+
+# Begin Target
+
+# Name "zlib - Win32 DLL"
+# Name "zlib - Win32 DLL Debug"
+# Name "zlib - Win32 DLL ASM"
+# Name "zlib - Win32 DLL Debug ASM"
+# Name "zlib - Win32 LIB"
+# Name "zlib - Win32 LIB Debug"
+# Begin Group "Source Files"
+
+# PROP Default_Filter "cpp;c;cxx;rc;def;r;odl;idl;hpj;bat"
+# Begin Source File
+
+SOURCE=..\..\..\zlib\adler32.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\..\zlib\compress.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\..\zlib\crc32.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\..\zlib\deflate.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\..\zlib\contrib\asm386\gvmat32c.c
+
+!IF  "$(CFG)" == "zlib - Win32 DLL"
+
+# PROP Exclude_From_Build 1
+
+!ELSEIF  "$(CFG)" == "zlib - Win32 DLL Debug"
+
+# PROP Exclude_From_Build 1
+
+!ELSEIF  "$(CFG)" == "zlib - Win32 DLL ASM"
+
+!ELSEIF  "$(CFG)" == "zlib - Win32 DLL Debug ASM"
+
+!ELSEIF  "$(CFG)" == "zlib - Win32 LIB"
+
+# PROP Exclude_From_Build 1
+
+!ELSEIF  "$(CFG)" == "zlib - Win32 LIB Debug"
+
+# PROP Exclude_From_Build 1
+
+!ENDIF 
+
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\..\zlib\gzio.c
+# ADD CPP /Yc"zutil.h"
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\..\zlib\infblock.c
+# ADD CPP /Yu"zutil.h"
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\..\zlib\infcodes.c
+# ADD CPP /Yu"zutil.h"
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\..\zlib\inffast.c
+# ADD CPP /Yu"zutil.h"
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\..\zlib\inflate.c
+# ADD CPP /Yu"zutil.h"
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\..\zlib\inftrees.c
+# ADD CPP /Yu"zutil.h"
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\..\zlib\infutil.c
+# ADD CPP /Yu"zutil.h"
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\..\zlib\trees.c
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\..\zlib\uncompr.c
+# End Source File
+# Begin Source File
+
+SOURCE=.\zlib.def
+
+!IF  "$(CFG)" == "zlib - Win32 DLL"
+
+!ELSEIF  "$(CFG)" == "zlib - Win32 DLL Debug"
+
+!ELSEIF  "$(CFG)" == "zlib - Win32 DLL ASM"
+
+!ELSEIF  "$(CFG)" == "zlib - Win32 DLL Debug ASM"
+
+!ELSEIF  "$(CFG)" == "zlib - Win32 LIB"
+
+# PROP Exclude_From_Build 1
+
+!ELSEIF  "$(CFG)" == "zlib - Win32 LIB Debug"
+
+# PROP Exclude_From_Build 1
+
+!ENDIF 
+
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\..\zlib\msdos\zlib.rc
+
+!IF  "$(CFG)" == "zlib - Win32 DLL"
+
+!ELSEIF  "$(CFG)" == "zlib - Win32 DLL Debug"
+
+!ELSEIF  "$(CFG)" == "zlib - Win32 DLL ASM"
+
+!ELSEIF  "$(CFG)" == "zlib - Win32 DLL Debug ASM"
+
+!ELSEIF  "$(CFG)" == "zlib - Win32 LIB"
+
+# PROP Exclude_From_Build 1
+
+!ELSEIF  "$(CFG)" == "zlib - Win32 LIB Debug"
+
+# PROP Exclude_From_Build 1
+
+!ENDIF 
+
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\..\zlib\zutil.c
+# ADD CPP /Yu"zutil.h"
+# End Source File
+# End Group
+# Begin Group "Header Files"
+
+# PROP Default_Filter "h;hpp;hxx;hm;inl"
+# Begin Source File
+
+SOURCE=..\..\..\zlib\deflate.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\..\zlib\infblock.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\..\zlib\infcodes.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\..\zlib\inffast.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\..\zlib\inffixed.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\..\zlib\inftrees.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\..\zlib\infutil.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\..\zlib\trees.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\..\zlib\zconf.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\..\zlib\zlib.h
+# End Source File
+# Begin Source File
+
+SOURCE=..\..\..\zlib\zutil.h
+# End Source File
+# End Group
+# Begin Group "Resource Files"
+
+# PROP Default_Filter "ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe"
+# End Group
+# End Target
+# End Project

projects/netware.txt

@@ -0,0 +1,6 @@
+A set of project files is available for Netware.  Get
+libpng-1.2.1beta3-project-netware.zip from a libpng distribution
+site such as http://libpng.sourceforge.net
+
+Put the zip file in this directory (projects) and then run
+"unzip -a libpng-1.2.1beta3-project-netware.zip"

projects/wince.txt

@@ -0,0 +1,6 @@
+A set of project files is available for WinCE.  Get
+libpng-1.2.1beta3-project-wince.zip from a libpng distribution
+site such as http://libpng.sourceforge.net
+
+Put the zip file in this directory (projects) and then run
+"unzip -a libpng-1.2.1beta3-project-wince.zip"

scripts/libpng.icc

@@ -1,6 +1,7 @@
 // Project file for libpng (static)
 // IBM VisualAge/C++ version 4.0 or later
 // Copyright (C) 2000 Cosmin Truta
+// For conditions of distribution and use, see copyright notice in png.h
 // Notes:
 //   All modules are compiled in C mode
 //   Tested with IBM VAC++ 4.0 under Win32

scripts/makefile.acorn

@@ -2,40 +2,40 @@
 
 
 # Toolflags:
-CCflags = -c -depend !Depend -IC:,Zlib: -g -throwback  -DRISCOS  -fnah 
+CCflags = -c -depend !Depend -IC:,Zlib: -g -throwback  -DRISCOS  -fnah
 C++flags = -c -depend !Depend -IC: -throwback
 Linkflags = -aif -c++ -o $@
 ObjAsmflags = -throwback -NoCache -depend !Depend
 CMHGflags = 
-LibFileflags = -c -l -o $@ 
+LibFileflags = -c -l -o $@
 Squeezeflags = -o $@
 
 
 # Final targets:
 @.libpng-lib:   @.o.png @.o.pngerror @.o.pngrio @.o.pngwio @.o.pngmem \
 	@.o.pngpread @.o.pngset @.o.pngget @.o.pngread @.o.pngrtran \
-	@.o.pngrutil @.o.pngtrans @.o.pngwrite @.o.pngwtran @.o.pngwutil 
+	@.o.pngrutil @.o.pngtrans @.o.pngwrite @.o.pngwtran @.o.pngwutil
 	LibFile $(LibFileflags) @.o.png @.o.pngerror @.o.pngrio @.o.pngrtran \
 	@.o.pngmem @.o.pngpread @.o.pngset @.o.pngget @.o.pngread @.o.pngwio \
-	@.o.pngrutil @.o.pngtrans  @.o.pngwrite @.o.pngwtran @.o.pngwutil 
+	@.o.pngrutil @.o.pngtrans  @.o.pngwrite @.o.pngwtran @.o.pngwutil
 @.mm-libpng-lib:   @.mm.png @.mm.pngerror @.mm.pngrio @.mm.pngwio @.mm.pngmem \
 	@.mm.pngpread @.mm.pngset @.mm.pngget @.mm.pngread @.mm.pngrtran \
-	@.mm.pngrutil @.mm.pngtrans @.mm.pngwrite @.mm.pngwtran @.mm.pngwutil 
+	@.mm.pngrutil @.mm.pngtrans @.mm.pngwrite @.mm.pngwtran @.mm.pngwutil
 	LibFile $(LibFileflags) @.mm.png @.mm.pngerror @.mm.pngrio \
 	@.mm.pngwio @.mm.pngmem @.mm.pngpread @.mm.pngset @.mm.pngget \
 	@.mm.pngread @.mm.pngrtran @.mm.pngrutil @.mm.pngtrans @.mm.pngwrite \
-	@.mm.pngwtran @.mm.pngwutil 
+	@.mm.pngwtran @.mm.pngwutil
 
 
 # User-editable dependencies:
 # (C) Copyright 1997 Tom Tanner
-Test: @.pngtest 
+Test: @.pngtest
 	<Prefix$Dir>.pngtest
 	@remove <Prefix$Dir>.pngtest
 
 #It would be nice if you could stop "make" listing from here on!
-@.pngtest:   @.o.pngtest @.libpng-lib C:o.Stubs Zlib:zlib_lib 
-	Link $(Linkflags) @.o.pngtest @.libpng-lib C:o.Stubs Zlib:zlib_lib 
+@.pngtest:   @.o.pngtest @.libpng-lib C:o.Stubs Zlib:zlib_lib
+	Link $(Linkflags) @.o.pngtest @.libpng-lib C:o.Stubs Zlib:zlib_lib
 
 .SUFFIXES: .o .mm .c
 

scripts/makefile.aix

@@ -0,0 +1,84 @@
+# makefile for libpng using gcc (generic, static library)
+# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
+# Copyright (C) 2000 Cosmin Truta
+# Copyright (C) 2000 Marc O. Gloor (AIX support added, from makefile.gcc)
+# For conditions of distribution and use, see copyright notice in png.h
+
+# Location of the zlib library and include files
+ZLIBINC = ../zlib
+ZLIBLIB = ../zlib
+
+# Compiler, linker, lib and other tools
+CC = gcc
+LD = $(CC)
+AR = ar rcs
+RANLIB = ranlib
+RM = rm -f
+
+# read libpng.txt or png.h to see why PNGMAJ is 3.  You should not
+# have to change it.
+PNGMAJ = 3
+PNGMIN = 1.2.1beta3
+PNGVER = $(PNGMAJ).$(PNGMIN)
+
+prefix=/usr/local
+INCPATH=$(prefix)/include
+LIBPATH=$(prefix)/lib
+
+CDEBUG = -g -DPNG_DEBUG=5
+LDDEBUG =
+CRELEASE = -O2
+LDRELEASE = -s
+CFLAGS = -I$(ZLIBINC) -Wall $(CRELEASE)
+LDFLAGS = -L. -L$(ZLIBLIB) -lpng -lz -lm $(LDRELEASE)
+
+# File extensions
+O=.o
+A=.a
+E=
+
+# Variables
+OBJS = png$(O) pngerror$(O) pngget$(O) pngmem$(O) pngpread$(O) \
+	pngread$(O) pngrio$(O) pngrtran$(O) pngrutil$(O) pngset$(O) \
+	pngtrans$(O) pngwio$(O) pngwrite$(O) pngwtran$(O) pngwutil$(O)
+
+# Targets
+all: libpng$(A) pngtest$(E)
+
+libpng$(A): $(OBJS)
+	$(AR) $@ $(OBJS)
+	$(RANLIB) $@
+
+test: pngtest$(E)
+	./pngtest$(E)
+
+pngtest$(E): pngtest$(O) libpng$(A)
+	$(LD) -o $@ pngtest$(O) $(LDFLAGS)
+
+install: libpng.a
+	-@if [ ! -d $(INCPATH)  ]; then mkdir $(INCPATH); fi
+	-@if [ ! -d $(LIBPATH) ]; then mkdir $(LIBPATH); fi
+	cp png.h pngconf.h $(INCPATH)
+	chmod 644 $(INCPATH)/png.h $(INCPATH)/pngconf.h
+	cp libpng.a $(LIBPATH)
+
+clean:
+	/bin/rm -f *.o libpng.a libpng.so* pngtest pngout.png
+
+png$(O): png.h pngconf.h
+pngerror$(O): png.h pngconf.h
+pngget$(O): png.h pngconf.h
+pngmem$(O): png.h pngconf.h
+pngpread$(O): png.h pngconf.h
+pngread$(O): png.h pngconf.h
+pngrio$(O): png.h pngconf.h
+pngrtran$(O): png.h pngconf.h
+pngrutil$(O): png.h pngconf.h
+pngset$(O): png.h pngconf.h
+pngtest$(O): png.h pngconf.h
+pngtrans$(O): png.h pngconf.h
+pngwio$(O): png.h pngconf.h
+pngwrite$(O): png.h pngconf.h
+pngwtran$(O): png.h pngconf.h
+pngwutil$(O): png.h pngconf.h
+

scripts/makefile.amiga

@@ -1,14 +1,20 @@
 # Commodore Amiga Makefile
-# makefile for libpng and SAS C V6.55 compiler
-# Copyright (C) 1995 Wolf Faust
-
+# makefile for libpng and SAS C V6.5x compiler
+# Copyright (C) 1995-2000 Wolf Faust
+# For conditions of distribution and use, see copyright notice in png.h
+#
+# Note: Use #define PNG_READ_BIG_ENDIAN_SUPPORTED in pngconf.h
+#
+# Location/path of zlib include files
+ZLIB=/zlib
 #compiler
 CC=sc
 #compiler flags
 # WARNING: a bug in V6.51 causes bad code with OPTGO
 #          So use V6.55 or set NOOPTGO!!!!!!!!!
 CFLAGS= NOSTKCHK PARMS=REG OPTIMIZE OPTGO OPTPEEP OPTINLOCAL OPTINL\
-	OPTLOOP OPTRDEP=4 OPTDEP=4 OPTCOMP=4 DEFINE=PNG_INTERNAL
+	OPTLOOP OPTRDEP=4 OPTDEP=4 OPTCOMP=4 INCLUDEDIR=$(ZLIB) \
+	DEFINE=PNG_INTERNAL
 #linker flags
 LDFLAGS= SD ND BATCH
 #link libs
@@ -22,8 +28,9 @@ AR= oml
 # make directory command
 MKDIR= makedir
 
-OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o pngpread.o \
-pngread.o pngerror.o pngwrite.o pngrtran.o pngwtran.o pngrio.o pngwio.o pngmem.o
+OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
+	pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
+	pngwtran.o pngmem.o pngerror.o pngpread.o
 
 all: libpng.lib pngtest
 
@@ -39,4 +46,3 @@ FROM LIB:c.o pngtest.o
 LIB $(LDLIBS)
 <
 
-

scripts/makefile.bc32

@@ -3,7 +3,7 @@
 # To build the library, do:
 #       "make -fmakefile.bc32"
 #
-# ---------- 32-bit Borland C++ ----------
+# -------------------- 32-bit Borland C++ --------------------
 
 ### Absolutely necessary for this makefile to work
 .AUTODEPEND