[libpng10] Imported from libpng-1.0.50.tar

ANNOUNCE

@@ -1,5 +1,5 @@
 
-Libpng 1.0.41 - October 31, 2008
+Libpng 1.0.50 - September 10, 2009
 
 This is a public release of libpng, intended for use in production codes.
 
@@ -8,49 +8,48 @@ Files available for download:
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   libpng-1.0.41.tar.gz
-   libpng-1.0.41.tar.lzma
-     (Get the lzma codec from <http://tukaani.org/lzma>).
-   libpng-1.0.41.tar.bz2
+   libpng-1.0.50.tar.xz (LZMA-compressed, recommended)
+   libpng-1.0.50.tar.gz
+   libpng-1.0.50.tar.bz2
 
 Source files with LF line endings (for Unix/Linux) without the
 "configure" script
 
-   libpng-1.0.41-no-config.tar.gz
-   libpng-1.0.41-no-config.tar.lzma
-   libpng-1.0.41-no-config.tar.bz2
+   libpng-1.0.50-no-config.tar.xz (LZMA-compressed, recommended)
+   libpng-1.0.50-no-config.tar.gz
+   libpng-1.0.50-no-config.tar.bz2
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lpng1041.zip
-   lpng1041.7z
-   lpng1041.tar.bz2
+   lpng1050.zip
+   lpng1050.7z
+   lpng1050.tar.bz2
 
 Project files
 
-   libpng-1.0.41-project-netware.zip
-   libpng-1.0.41-project-wince.zip
+   libpng-1.0.50-project-netware.zip
+   libpng-1.0.50-project-wince.zip
 
 Other information:
 
-   libpng-1.0.41-README.txt
-   libpng-1.0.41-KNOWNBUGS.txt
-   libpng-1.0.41-LICENSE.txt
-   libpng-1.0.41-Y2K-compliance.txt
+   libpng-1.0.50-README.txt
+   libpng-1.0.50-KNOWNBUGS.txt
+   libpng-1.0.50-LICENSE.txt
+   libpng-1.0.50-Y2K-compliance.txt
 
-Changes since the last public release (1.0.40):
+Changes since the last public release (1.0.49):
 
-version 1.0.41 [October 31, 2008]
+version 1.0.50 [September 10, 2009]
+
+version 1.0.50 [September 10, 2009]
+  Removed some editing cruft from pngset.c and pngwutil.c.
 
-  Revised makefile.darwin to fix shared library numbering.
-  Change png_set_gray_1_2_4_to_8() to png_set_expand_gray_1_2_4_to_8()
-    in example.c (debian bug report)
-  Changed remaining "key" to "png_ptr->chunkdata" in png_handle_tEXt()
-    to avoid memory leak after memory failure while reading tEXt chunk.`
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
-(subscription required; visit 
+
+Send comments/corrections/commendations to png-mng-implement at lists.sf.net
+(subscription required; visit
 https://lists.sourceforge.net/lists/listinfo/png-mng-implement
 to subscribe) or to glennrp at users.sourceforge.net
 

CHANGES

@@ -1,4 +1,4 @@
-
+/*
 CHANGES - changes for libpng
 
 version 0.2
@@ -539,7 +539,8 @@ version 1.0.5d [November 29, 1999]
   Eliminated pngtypes.h; use macros instead to declare PNG_CHNK arrays.
   Renamed "PNG_GLOBAL_ARRAYS" to "PNG_USE_GLOBAL_ARRAYS" and made available
     to applications a macro "PNG_USE_LOCAL_ARRAYS".
-  #ifdef out all the new declarations when PNG_USE_GLOBAL_ARRAYS is defined.
+  Remove all the new declarations with #ifdef/#endif when
+    PNG_USE_GLOBAL_ARRAYS is defined.
   Added PNG_EXPORT_VAR macro to accommodate making DLL's.
 version 1.0.5e [November 30, 1999]
   Added iCCP, iTXt, and sPLT support; added "lang" member to the png_text
@@ -1172,7 +1173,7 @@ version 1.2.4beta3 [June 28, 2002]
   Plugged memory leak of row_buf in pngtest.c when there is a png_error().
   Detect buffer overflow in pngpread.c when IDAT is corrupted with extra data.
   Added "test-installed" target to makefile.32sunu, makefile.64sunu,
-    makefile.beos, makefile.darwin, makefile.dec, makefile.macosx, 
+    makefile.beos, makefile.darwin, makefile.dec, makefile.macosx,
     makefile.solaris, makefile.hpux, makefile.hpgcc, and makefile.so9.
 version 1.2.4rc1 and 1.0.14rc1 [July 2, 2002]
   Added "test-installed" target to makefile.cygwin and makefile.sco.
@@ -1291,7 +1292,7 @@ version 1.2.6beta4 [July 28, 2004]
   Added PNG_NO_SEQUENTIAL_READ_SUPPORTED macro to conditionally remove
     sequential read support.
   Added some "#if PNG_WRITE_SUPPORTED" blocks.
-  #ifdef'ed out some redundancy in png_malloc_default().
+  Removed some redundancy with #ifdef/#endif in png_malloc_default().
   Use png_malloc instead of png_zalloc to allocate the pallete.
 version 1.0.16rc1 and 1.2.6rc1 [August 4, 2004]
   Fixed buffer overflow vulnerability in png_handle_tRNS()
@@ -1359,7 +1360,8 @@ version 1.2.8beta1 [November 1, 2004]
   Fixed bug in png_text_compress() that would fail to complete a large block.
   Fixed bug, introduced in libpng-1.2.7, that overruns a buffer during
     strip alpha operation in png_do_strip_filler().
-  #ifdef out png_info_init in png.c and png_read_init in pngread.c (as of 1.3.0)
+  Comment out with #ifdef/#endif png_info_init in png.c and png_read_init
+    in pngread.c (as of 1.3.0)
 version 1.2.8beta2 [November 2, 2004]
   Reduce color_type to a nonalpha type after strip alpha operation in
     png_do_strip_filler().
@@ -1376,7 +1378,7 @@ version 1.2.8beta5 [November 20, 2004]
   Use png_ptr->flags instead of png_ptr->transformations to pass
     PNG_STRIP_ALPHA info to png_do_strip_filler(), to preserve ABI
     compatibility.
-  Revised handling of SPECIALBUILD, PRIVATEBUILD, 
+  Revised handling of SPECIALBUILD, PRIVATEBUILD,
     PNG_LIBPNG_BUILD_SPECIAL_STRING and PNG_LIBPNG_BUILD_PRIVATE_STRING.
 version 1.2.8rc1 [November 24, 2004]
   Moved handling of BUILD macros from pngconf.h to png.h
@@ -1674,14 +1676,14 @@ version 1.2.16beta1 [January 6, 2007]
 
 version 1.2.16beta2 [January 16, 2007]
   Revised scripts/CMakeLists.txt
- 
+
 version 1.0.24, 1.2.16 [January 31, 2007]
   No changes.
- 
+
 version 1.2.17beta1 [March 6, 2007]
   Revised scripts/CMakeLists.txt to install both shared and static libraries.
   Deleted a redundant line from pngset.c.
- 
+
 version 1.2.17beta2 [April 26, 2007]
   Relocated misplaced test for png_ptr == NULL in pngpread.c
   Change "==" to "&" for testing PNG_RGB_TO_GRAY_ERR & PNG_RGB_TO_GRAY_WARN
@@ -1702,7 +1704,7 @@ version 1.2.17rc2 [May 8, 2007]
   Added png_ptr->unknown_chunk to hold working unknown chunk data, so it
     can be free'ed in case of error.  Revised unknown chunk handling in
     pngrutil.c and pngpread.c to use this structure.
- 
+
 version 1.2.17rc3 [May 8, 2007]
   Revised symbol-handling in configure script.
 
@@ -1745,9 +1747,9 @@ version 1.2.19beta6 [May 22, 2007]
   Added a special "_MSC_VER" case that defines png_snprintf to _snprintf
 
 version 1.2.19beta7 [May 22, 2007]
-  Squelched png_squelch_warnings() in pnggccrd.c and added an
-    #ifdef PNG_MMX_CODE_SUPPORTED block around the declarations that caused
-    the warnings that png_squelch_warnings was squelching.
+  Squelched png_squelch_warnings() in pnggccrd.c and added
+    an #ifdef PNG_MMX_CODE_SUPPORTED/#endif block around the declarations
+    that caused the warnings that png_squelch_warnings was squelching.
 
 version 1.2.19beta8 [May 22, 2007]
   Removed __MMX__ from test in pngconf.h.
@@ -2145,7 +2147,7 @@ version 1.2.29beta03 [May 2, 2008]
     automake options.
   Changed $(ECHO) to echo in Makefile.am and Makefile.in
   Updated all configure files to autoconf-2.62
-  #ifdef out pnggcrd.c code if using MSC_VER
+  Comment out pnggcrd.c code with #ifdef/#endif if using MSC_VER
 
 version 1.2.29rc01 [May 4, 2008]
   No changes.
@@ -2175,7 +2177,7 @@ version 1.2.30beta03 [July 6, 2008]
 version 1.2.30beta04 [July 10, 2008]
   Merged more cosmetic whitespace changes from libpng-1.4.0beta19.
 
-version 1.0.38rc01, 1.2.30rc01 [October 31, 2008]
+version 1.0.38rc01, 1.2.30rc01 [July 18, 2008]
   No changes.
 
 version 1.0.38rc02, 1.2.30rc02 [July 21, 2008]
@@ -2246,10 +2248,219 @@ version 1.2.33beta01 [October 6, 2008]
 version 1.2.33rc01 [October 15, 2008]
   No changes.
 
-version 1.0.41rc01, version 1.2.33rc02 [October 31, 2008]
+version 1.0.41rc01, version 1.2.33rc02 [October 23, 2008]
   Changed remaining "key" to "png_ptr->chunkdata" in png_handle_tEXt()
     to avoid memory leak after memory failure while reading tEXt chunk.`
 
+version 1.2.33 [October 31, 2008]
+  No changes.
+
+version 1.2.34beta01 [November 27, 2008]
+  Revised png_warning() to write its message on standard output by default
+    when warning_fn is NULL. This was the behavior prior to libpng-1.2.9beta9.
+  Fixed string vs pointer-to-string error in png_check_keyword().
+  Added png_check_cHRM_fixed() in png.c and moved checking from pngget.c,
+    pngrutil.c, and pngwrite.c, and eliminated floating point cHRM checking.
+  Added check for zero-area RGB cHRM triangle in png_check_cHRM_fixed().
+  In png_check_cHRM_fixed(), ensure white_y is > 0, and removed redundant
+    check for all-zero coordinates that is detected by the triangle check.
+  Revised png_warning() to write its message on standard output by default
+    when warning_fn is NULL.
+
+version 1.2.34beta02 [November 28, 2008]
+  Corrected off-by-one error in bKGD validity check in png_write_bKGD()
+    and in png_handle_bKGD().
+
+version 1.2.34beta03 [December 1, 2008]
+  Revised bKGD validity check to use >= x instead of > x + 1
+  Merged with png_debug from libpng-1.4.0 to remove newlines.
+
+version 1.2.34beta04 [December 2, 2008]
+  More merging with png_debug from libpng-1.4.0 to remove newlines.
+
+version 1.2.34beta05 [December 5, 2008]
+  Removed redundant check for key==NULL before calling png_check_keyword()
+    to ensure that new_key gets initialized and removed extra warning
+    (Arvan Pritchard).
+
+version 1.2.34beta06 [December 9, 2008]
+  In png_write_png(), respect the placement of the filler bytes in an earlier
+    call to png_set_filler() (Jim Barry).
+
+version 1.2.34beta07 [December 9, 2008]
+  Undid previous change and added PNG_TRANSFORM_STRIP_FILLER_BEFORE and
+    PNG_TRANSFORM_STRIP_FILLER_AFTER conditionals and deprecated
+    PNG_TRANSFORM_STRIP_FILLER (Jim Barry).
+
+version 1.0.42rc01, 1.2.34rc01 [December 11, 2008]
+  No changes.
+
+version 1.0.42, 1.2.34 [December 18, 2008]
+  No changes.
+
+version 1.2.35beta01 [February 4, 2009]
+  Zero out some arrays of pointers after png_malloc(). (Tavis Ormandy)
+
+version 1.2.35beta02 [February 4, 2009]
+  Zero out more arrays of pointers after png_malloc().
+
+version 1.2.35beta03 [February 5, 2009]
+  Use png_memset() instead of a loop to intialize pointers.  We realize
+    this will not work on platforms where the NULL pointer is not all zeroes.
+
+version 1.2.35rc01 [February 11, 2009]
+  No changes.
+
+version 1.2.35rc02 [February 12, 2009]
+  Fix typo in new png_memset call in pngset.c (png_color should be png_charp)
+
+version 1.0.43 and 1.2.35 [February 14, 2009]
+  No changes.
+
+version 1.2.36beta01 [February 28, 2009]
+  Revised comments in png_set_read_fn() and png_set_write_fn().
+  Revised order of #ifdef's and indentation in png_debug definitions of png.h
+    bug introduced in libpng-1.2.34.
+
+version 1.2.36beta02 [March 21, 2009]
+  Use png_memset() after png_malloc() of big_row_buf when reading an
+    interlaced file, to avoid a possible UMR.
+  Undid recent revision of PNG_NO_STDIO version of png_write_flush().  Users
+    having trouble with fflush() can build with PNG_NO_WRITE_FLUSH defined.
+  Revised libpng*.txt documentation about use of png_write_flush().
+  Removed fflush() from pngtest.c.
+  Added "#define PNG_NO_WRITE_FLUSH" to contrib/pngminim/encoder/pngusr.h
+
+version 1.2.36beta03 [March 27, 2009]
+  Relocated misplaced PNG_1_0_X define in png.h that caused the prototype
+    for png_set_strip_error_numbers() to be omitted from PNG_NO_ASSEMBLER_CODE
+    builds.  This bug was introduced in libpng-1.2.15beta4.
+  Added a section on differences between 1.0.x and 1.2.x to libpng.3/libpng.txt
+
+version 1.2.36beta04 [April 5, 2009]
+  Fixed potential memory leak of "new_name" in png_write_iCCP() (Ralph Giles)
+
+version 1.2.36beta05 [April 24, 2009]
+  Added "ifndef PNG_SKIP_SETJMP_CHECK" block in pngconf.h to allow
+    application code writers to bypass the check for multiple inclusion
+    of setjmp.h when they know that it is safe to ignore the situation.
+  Made some cosmetic changes to whitespace in pngtest output.
+  Renamed "user_chunk_data" to "my_user_chunk_data" in pngtest.c to suppress
+    "shadowed declaration" warning from gcc-4.3.3.
+  Renamed "gamma" to "png_gamma" in pngset.c to avoid "shadowed declaration"
+    warning about a global "gamma" variable in math.h on some platforms.
+
+version 1.2.36rc01 [April 30, 2009]
+  No changes.
+
+version 1.0.44 and 1.2.36 [May 7, 2009]
+  No changes.
+
+version 1.2.37beta01 [May 14, 2009]
+  Fixed inconsistency in pngrutil.c, introduced in libpng-1.2.36.  The
+    memset() was using "png_ptr->rowbytes" instead of "row_bytes", which
+    the corresponding png_malloc() uses (Joe Drew).
+  Clarified usage of sig_bit versus sig_bit_p in example.c (Vincent Torri)
+  Updated some of the makefiles in the scripts directory (merged with
+    those in libpng-1.4.0beta57).
+
+version 1.2.37beta02 [May 19, 2009]
+  Fixed typo in libpng documentation (FILTER_AVE should be FILTER_AVG)
+  Relocated misplaced #endif in pngwrite.c, sCAL chunk handler.
+  Conditionally compile png_read_finish_row() which is not used by
+    progressive readers.
+  Added contrib/pngminim/preader to demonstrate building minimal progressive
+    decoder, based on contrib/gregbook with embedded libpng and zlib.
+
+version 1.2.37beta03 [May 20, 2009]
+  In contrib/pngminim/*, renamed "makefile.std" to "makefile", since there
+    is only one makefile in those directories, and revised the README files
+    accordingly.
+  Reformated sources in libpng style (3-space indentation, comment format)
+
+version 1.2.37rc01 [May 27, 2009]
+  No changes.
+
+versions 1.2.37 and 1.0.45 [June 4, 2009]
+  Reformatted several remaining "else statement;" and "if () statement;" into
+    two lines.
+  Added "#define PNG_NO_WRITE_SWAP" to contrib/pngminim/encoder/pngusr.h
+    and "define PNG_NO_READ_SWAP" to decoder/pngusr.h and preader/pngusr.h
+  Added sections about the git repository and our coding style to the
+    documentation (merged from libpng-1.4.0beta62)
+  Added a section to the libpng documentation about using png_get_io_ptr()
+    in configure scripts to detect the presence of libpng.
+
+version 1.2.38beta01 [June 17, 2009]
+  Revised libpng*.txt and libpng.3 to mention calling png_set_IHDR()
+    multiple times and to specify the sample order in the tRNS chunk,
+    because the ISO PNG specification has a typo in the tRNS table.
+  Changed several PNG_UNKNOWN_CHUNK_SUPPORTED to
+    PNG_HANDLE_AS_UNKNOWN_SUPPORTED, to make the png_set_keep mechanism
+    available for ignoring known chunks even when not saving unknown chunks.
+  Adopted preference for consistent use of "#ifdef" and "#ifndef" versus
+    "#if defined()" and "if !defined()" where possible.
+  Added PNG_NO_HANDLE_AS_UNKNOWN in the PNG_LEGACY_SUPPORTED block of
+    pngconf.h, and moved the various unknown chunk macro definitions
+    outside of the PNG_READ|WRITE_ANCILLARY_CHUNK_SUPPORTED blocks.
+
+version 1.0.46 [June 18, 2009]
+  Removed some editing cruft from scripts/libpng.pc.in and some makefiles.
+
+version 1.2.38rc01 [June 24, 2009]
+  No changes.
+
+version 1.2.38rc02 [June 29, 2009]
+  Added a reference to the libpng license in each source file.
+
+version 1.2.38rc03 [July 11, 2009]
+  Revised references to the libpng license in pngconf.h and contrib/visupng
+    source files.
+  Rebuilt configure scripts with autoconf-2.63.
+
+version 1.0.47 and 1.2.38 [July 16, 2009]
+  No changes.
+
+version 1.2.39beta01 [July 25, 2009]
+  Added a prototype for png_64bit_product() in png.c
+
+version 1.2.39beta02 [July 27, 2009]
+  Avoid a possible NULL dereference in debug build, in png_set_text_2().
+    (bug introduced in libpng-0.95, discovered by Evan Rouault)
+
+version 1.2.39beta03 [July 29, 2009]
+  Relocated new png_64_bit_product() prototype into png.h
+  Expanded the information about prototypes in the libpng style section of
+    the documentation.
+  Rebuilt configure scripts with autoconf-2.64.
+
+version 1.2.39beta04 [August 1, 2009]
+  Replaced *.tar.lzma with *.txz in distribution.  Get the xz codec
+    from <http://tukaani.org/xz>.
+
+version 1.2.39beta05 [August 1, 2009]
+  Reject attempt to write iCCP chunk with negative embedded profile length
+    (JD Chen)
+
+version 1.2.39c01 [August 6, 2009]
+  No changes.
+
+version 1.2.39 and 1.0.48 [August 13, 2009]
+  No changes.
+
+version 1.2.40beta01 [August 20, 2009]
+  Removed an extra png_debug() recently added to png_write_find_filter().
+  Fixed incorrect #ifdef in pngset.c regarding unknown chunk support.
+
+version 1.2.40rc01 [September 2, 2009]
+  Various bugfixes and improvements to CMakeLists.txt (Philip Lowman)
+
+version 1.2.40 and 1.0.49 [September 10, 2009]
+  No changes.
+
+version 1.0.50 [September 10, 2009]
+  Removed some editing cruft from pngset.c and pngwutil.c.
+
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
 https://lists.sourceforge.net/lists/listinfo/png-mng-implement
@@ -2257,3 +2468,4 @@ to subscribe)
 or to glennrp at users.sourceforge.net
 
 Glenn R-P
+*/

INSTALL

@@ -1,5 +1,5 @@
 
-Installing libpng version 1.0.41 - October 31, 2008
+Installing libpng version 1.0.50 - September 10, 2009
 
 On Unix/Linux and similar systems, you can simply type
 
@@ -44,7 +44,7 @@ to have access to the zlib.h and zconf.h include files that
 correspond to the version of zlib that's installed.
 
 You can rename the directories that you downloaded (they
-might be called "libpng-1.0.41" or "lpng109" and "zlib-1.2.1"
+might be called "libpng-1.0.50" or "lpng109" and "zlib-1.2.1"
 or "zlib121") so that you have directories called "zlib" and "libpng".
 
 Your directory structure should look like this:
@@ -101,9 +101,9 @@ include
  CMakeLists.txt    =>  "cmake" script
  makefile.std      =>  Generic UNIX makefile (cc, creates static libpng.a)
  makefile.elf      =>  Linux/ELF makefile symbol versioning,
-                       gcc, creates libpng10.so.0.1.0.41)
+                       gcc, creates libpng10.so.0.1.0.50)
  makefile.linux    =>  Linux/ELF makefile
-                       (gcc, creates libpng10.so.0.1.0.41)
+                       (gcc, creates libpng10.so.0.1.0.50)
  makefile.gcc      =>  Generic makefile (gcc, creates static libpng.a)
  makefile.knr      =>  Archaic UNIX Makefile that converts files with
                        ansi2knr (Requires ansi2knr.c from
@@ -125,14 +125,14 @@ include
  makefile.openbsd  =>  OpenBSD makefile
  makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
  makefile.sggcc    =>  Silicon Graphics (gcc,
-                       creates libpng10.so.0.1.0.41)
+                       creates libpng10.so.0.1.0.50)
  makefile.sunos    =>  Sun makefile
  makefile.solaris  =>  Solaris 2.X makefile (gcc,
-                       creates libpng10.so.0.1.0.41)
+                       creates libpng10.so.0.1.0.50)
  makefile.solaris-x86 =>  Solaris/intelMMX 2.X makefile (gcc,
-                       creates libpng10.so.0.1.0.41)
+                       creates libpng10.so.0.1.0.50)
  makefile.so9      =>  Solaris 9 makefile (gcc,
-                       creates libpng10.so.0.1.0.41)
+                       creates libpng10.so.0.1.0.50)
  makefile.32sunu   =>  Sun Ultra 32-bit makefile
  makefile.64sunu   =>  Sun Ultra 64-bit makefile
  makefile.sco      =>  For SCO OSr5  ELF and Unixware 7 with Native cc

KNOWNBUG

@@ -1,5 +1,5 @@
 
-Known bugs in libpng version 1.0.41
+Known bugs in libpng version 1.0.50
 
 1. February 23, 2006: The custom makefiles don't build libpng with -lz.
 

LICENSE

@@ -8,8 +8,10 @@ COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
 If you modify libpng you may insert additional notices immediately following
 this sentence.
 
-libpng versions 1.2.6, August 15, 2004, through 1.0.41, October 31, 2008, are
-Copyright (c) 2004, 2006-2008 Glenn Randers-Pehrson, and are
+This code is released under the libpng license.
+
+libpng versions 1.2.6, August 15, 2004, through 1.0.50, September 10, 2009, are
+Copyright (c) 2004, 2006-2009 Glenn Randers-Pehrson, and are
 distributed according to the same disclaimer and license as libpng-1.2.5
 with the following individual added to the list of Contributing Authors
 
@@ -106,4 +108,4 @@ certification mark of the Open Source Initiative.
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-October 31, 2008
+September 10, 2009

Makefile.am

@@ -2,9 +2,9 @@
 #   Source file for Makefile.in (and hence Makefile)
 #
 # Makefile.am need only be changed on a major version number
-# change (e.g. libpng12 --> libpng13).  In that case seach
+# change (e.g. libpng12 --> libpng14).  In that case seach
 # this file for every instance of the old base name (libpng12)
-# and change to the new one (libpng13), then change the
+# and change to the new one (libpng14), then change the
 # -version-number settings below so that the new values have
 # the correct major part (first field).
 
@@ -86,7 +86,7 @@ EXTRA_DIST= \
 	${srcdir}/contrib/pngsuite/* \
 	${srcdir}/contrib/visupng/* \
 	$(TESTS) \
-	example.c libpng-1.0.41.txt pngvcrd.c 
+	example.c libpng-1.0.50.txt pngvcrd.c 
 
 CLEANFILES= pngout.png libpng10.pc libpng10-config libpng.vers \
 libpng.sym

README

@@ -1,4 +1,4 @@
-README for libpng version 1.0.41 - October 31, 2008 (shared library 10.0)
+README for libpng version 1.0.50 - September 10, 2009 (shared library 10.0)
 See the note about version numbers near the top of png.h
 
 See INSTALL for instructions on how to install libpng.
@@ -194,11 +194,11 @@ Files in this distribution:
        descrip.mms      =>  VMS makefile for MMS or MMK
        makefile.std     =>  Generic UNIX makefile (cc, creates static libpng.a)
        makefile.elf     =>  Linux/ELF makefile symbol versioning,
-                            gcc, creates libpng10.so.0.1.0.41)
+                            gcc, creates libpng10.so.0.1.0.50)
        makefile.linux   =>  Linux/ELF makefile
-                            (gcc, creates libpng10.so.0.1.0.41)
+                            (gcc, creates libpng10.so.0.1.0.50)
        makefile.gcmmx   =>  Linux/ELF makefile
-                            (gcc, creates libpng10.so.0.1.0.41,
+                            (gcc, creates libpng10.so.0.1.0.50,
                             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
@@ -220,12 +220,12 @@ Files in this distribution:
        makefile.openbsd =>  OpenBSD makefile
        makefile.sgi     =>  Silicon Graphics IRIX (cc, creates static lib)
        makefile.sggcc   =>  Silicon Graphics
-                            (gcc, creates libpng10.so.0.1.0.41)
+                            (gcc, creates libpng10.so.0.1.0.50)
        makefile.sunos   =>  Sun makefile
        makefile.solaris =>  Solaris 2.X makefile
-                            (gcc, creates libpng10.so.0.1.0.41)
+                            (gcc, creates libpng10.so.0.1.0.50)
        makefile.so9     =>  Solaris 9 makefile
-                            (gcc, creates libpng10.so.0.1.0.41)
+                            (gcc, creates libpng10.so.0.1.0.50)
        makefile.32sunu  =>  Sun Ultra 32-bit makefile
        makefile.64sunu  =>  Sun Ultra 64-bit makefile
        makefile.sco     =>  For SCO OSr5  ELF and Unixware 7 with Native cc

TODO

@@ -22,3 +22,4 @@ 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.
+Add interpolated method of handling interlacing.

Y2KINFO

@@ -1,13 +1,13 @@
    Y2K compliance in libpng:
    =========================
 
-      October 31, 2008
+      September 10, 2009
 
       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 1.0.41 are Y2K compliant.  It is my belief that earlier
+      upward through 1.0.50 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

config.guess

@@ -4,7 +4,7 @@
 #   2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
 #   Free Software Foundation, Inc.
 
-timestamp='2008-01-08'
+timestamp='2009-04-27'
 
 # This file is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
@@ -324,6 +324,9 @@ case "${UNAME_MACHINE}:${UNAME_SYSTEM}:${UNAME_RELEASE}:${UNAME_VERSION}" in
 	case `/usr/bin/uname -p` in
 	    sparc) echo sparc-icl-nx7; exit ;;
 	esac ;;
+    s390x:SunOS:*:*)
+	echo ${UNAME_MACHINE}-ibm-solaris2`echo ${UNAME_RELEASE}|sed -e 's/[^.]*//'`
+	exit ;;
     sun4H:SunOS:5.*:*)
 	echo sparc-hal-solaris2`echo ${UNAME_RELEASE}|sed -e 's/[^.]*//'`
 	exit ;;
@@ -331,7 +334,20 @@ case "${UNAME_MACHINE}:${UNAME_SYSTEM}:${UNAME_RELEASE}:${UNAME_VERSION}" in
 	echo sparc-sun-solaris2`echo ${UNAME_RELEASE}|sed -e 's/[^.]*//'`
 	exit ;;
     i86pc:SunOS:5.*:* | i86xen:SunOS:5.*:*)
-	echo i386-pc-solaris2`echo ${UNAME_RELEASE}|sed -e 's/[^.]*//'`
+	eval $set_cc_for_build
+	SUN_ARCH="i386"
+	# If there is a compiler, see if it is configured for 64-bit objects.
+	# Note that the Sun cc does not turn __LP64__ into 1 like gcc does.
+	# This test works for both compilers.
+	if [ "$CC_FOR_BUILD" != 'no_compiler_found' ]; then
+	    if (echo '#ifdef __amd64'; echo IS_64BIT_ARCH; echo '#endif') | \
+		(CCOPTS= $CC_FOR_BUILD -E - 2>/dev/null) | \
+		grep IS_64BIT_ARCH >/dev/null
+	    then
+		SUN_ARCH="x86_64"
+	    fi
+	fi
+	echo ${SUN_ARCH}-pc-solaris2`echo ${UNAME_RELEASE}|sed -e 's/[^.]*//'`
 	exit ;;
     sun4*:SunOS:6*:*)
 	# According to config.sub, this is the proper way to canonicalize
@@ -796,7 +812,7 @@ EOF
 	    x86)
 		echo i586-pc-interix${UNAME_RELEASE}
 		exit ;;
-	    EM64T | authenticamd)
+	    EM64T | authenticamd | genuineintel)
 		echo x86_64-unknown-interix${UNAME_RELEASE}
 		exit ;;
 	    IA64)
@@ -935,6 +951,9 @@ EOF
 	if test "$?" = 0 ; then LIBC="libc1" ; else LIBC="" ; fi
 	echo ${UNAME_MACHINE}-unknown-linux-gnu${LIBC}
 	exit ;;
+    padre:Linux:*:*)
+	echo sparc-unknown-linux-gnu
+	exit ;;
     parisc:Linux:*:* | hppa:Linux:*:*)
 	# Look for CPU level
 	case `grep '^cpu[^a-z]*:' /proc/cpuinfo 2>/dev/null | cut -d' ' -f2` in
@@ -985,9 +1004,6 @@ EOF
 	  a.out-i386-linux)
 		echo "${UNAME_MACHINE}-pc-linux-gnuaout"
 		exit ;;
-	  coff-i386)
-		echo "${UNAME_MACHINE}-pc-linux-gnucoff"
-		exit ;;
 	  "")
 		# Either a pre-BFD a.out linker (linux-gnuoldld) or
 		# one that does not give us useful --help.
@@ -1102,8 +1118,11 @@ EOF
     pc:*:*:*)
 	# Left here for compatibility:
         # uname -m prints for DJGPP always 'pc', but it prints nothing about
-        # the processor, so we play safe by assuming i386.
-	echo i386-pc-msdosdjgpp
+        # the processor, so we play safe by assuming i586.
+	# Note: whatever this is, it MUST be the same as what config.sub
+	# prints for the "djgpp" host, or else GDB configury will decide that
+	# this is a cross-build.
+	echo i586-pc-msdosdjgpp
         exit ;;
     Intel:Mach:3*:*)
 	echo i386-pc-mach3
@@ -1141,6 +1160,16 @@ EOF
     3[34]??:*:4.0:* | 3[34]??,*:*:4.0:*)
         /bin/uname -p 2>/dev/null | grep 86 >/dev/null \
           && { echo i486-ncr-sysv4; exit; } ;;
+    NCR*:*:4.2:* | MPRAS*:*:4.2:*)
+	OS_REL='.3'
+	test -r /etc/.relid \
+	    && OS_REL=.`sed -n 's/[^ ]* [^ ]* \([0-9][0-9]\).*/\1/p' < /etc/.relid`
+	/bin/uname -p 2>/dev/null | grep 86 >/dev/null \
+	    && { echo i486-ncr-sysv4.3${OS_REL}; exit; }
+	/bin/uname -p 2>/dev/null | /bin/grep entium >/dev/null \
+	    && { echo i586-ncr-sysv4.3${OS_REL}; exit; }
+	/bin/uname -p 2>/dev/null | /bin/grep pteron >/dev/null \
+	    && { echo i586-ncr-sysv4.3${OS_REL}; exit; } ;;
     m68*:LynxOS:2.*:* | m68*:LynxOS:3.0*:*)
 	echo m68k-unknown-lynxos${UNAME_RELEASE}
 	exit ;;
@@ -1216,6 +1245,9 @@ EOF
     BePC:BeOS:*:*)	# BeOS running on Intel PC compatible.
 	echo i586-pc-beos
 	exit ;;
+    BePC:Haiku:*:*)	# Haiku running on Intel PC compatible.
+	echo i586-pc-haiku
+	exit ;;
     SX-4:SUPER-UX:*:*)
 	echo sx4-nec-superux${UNAME_RELEASE}
 	exit ;;
@@ -1324,6 +1356,9 @@ EOF
     i*86:rdos:*:*)
 	echo ${UNAME_MACHINE}-pc-rdos
 	exit ;;
+    i*86:AROS:*:*)
+	echo ${UNAME_MACHINE}-pc-aros
+	exit ;;
 esac
 
 #echo '(No uname command or uname output not recognized.)' 1>&2
@@ -1484,9 +1519,9 @@ This script, last modified $timestamp, has failed to recognize
 the operating system you are using. It is advised that you
 download the most up to date version of the config scripts from
 
-  http://savannah.gnu.org/cgi-bin/viewcvs/*checkout*/config/config/config.guess
+  http://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.guess;hb=HEAD
 and
-  http://savannah.gnu.org/cgi-bin/viewcvs/*checkout*/config/config/config.sub
+  http://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.sub;hb=HEAD
 
 If the version you run ($0) is already up to date, please
 send the following data and any information you think might be

config.h.in

@@ -64,6 +64,9 @@
 /* Define to the one symbol short name of this package. */
 #undef PACKAGE_TARNAME
 
+/* Define to the home page for this package. */
+#undef PACKAGE_URL
+
 /* Define to the version of this package. */
 #undef PACKAGE_VERSION
 

config.sub

@@ -4,7 +4,7 @@
 #   2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
 #   Free Software Foundation, Inc.
 
-timestamp='2008-01-16'
+timestamp='2009-04-17'
 
 # This file is (in principle) common to ALL GNU software.
 # The presence of a machine in this file suggests that SOME GNU software
@@ -122,6 +122,7 @@ maybe_os=`echo $1 | sed 's/^\(.*\)-\([^-]*-[^-]*\)$/\2/'`
 case $maybe_os in
   nto-qnx* | linux-gnu* | linux-dietlibc | linux-newlib* | linux-uclibc* | \
   uclinux-uclibc* | uclinux-gnu* | kfreebsd*-gnu* | knetbsd*-gnu* | netbsd*-gnu* | \
+  kopensolaris*-gnu* | \
   storm-chaos* | os2-emx* | rtmk-nova*)
     os=-$maybe_os
     basic_machine=`echo $1 | sed 's/^\(.*\)-\([^-]*-[^-]*\)$/\1/'`
@@ -249,13 +250,16 @@ case $basic_machine in
 	| h8300 | h8500 | hppa | hppa1.[01] | hppa2.0 | hppa2.0[nw] | hppa64 \
 	| i370 | i860 | i960 | ia64 \
 	| ip2k | iq2000 \
+	| lm32 \
 	| m32c | m32r | m32rle | m68000 | m68k | m88k \
-	| maxq | mb | microblaze | mcore | mep \
+	| maxq | mb | microblaze | mcore | mep | metag \
 	| mips | mipsbe | mipseb | mipsel | mipsle \
 	| mips16 \
 	| mips64 | mips64el \
-	| mips64vr | mips64vrel \
+	| mips64octeon | mips64octeonel \
 	| mips64orion | mips64orionel \
+	| mips64r5900 | mips64r5900el \
+	| mips64vr | mips64vrel \
 	| mips64vr4100 | mips64vr4100el \
 	| mips64vr4300 | mips64vr4300el \
 	| mips64vr5000 | mips64vr5000el \
@@ -268,6 +272,7 @@ case $basic_machine in
 	| mipsisa64sr71k | mipsisa64sr71kel \
 	| mipstx39 | mipstx39el \
 	| mn10200 | mn10300 \
+	| moxie \
 	| mt \
 	| msp430 \
 	| nios | nios2 \
@@ -277,7 +282,7 @@ case $basic_machine in
 	| powerpc | powerpc64 | powerpc64le | powerpcle | ppcbe \
 	| pyramid \
 	| score \
-	| sh | sh[1234] | sh[24]a | sh[23]e | sh[34]eb | sheb | shbe | shle | sh[1234]le | sh3ele \
+	| sh | sh[1234] | sh[24]a | sh[24]aeb | sh[23]e | sh[34]eb | sheb | shbe | shle | sh[1234]le | sh3ele \
 	| sh64 | sh64le \
 	| sparc | sparc64 | sparc64b | sparc64v | sparc86x | sparclet | sparclite \
 	| sparcv8 | sparcv9 | sparcv9b | sparcv9v \
@@ -286,7 +291,7 @@ case $basic_machine in
 	| v850 | v850e \
 	| we32k \
 	| x86 | xc16x | xscale | xscalee[bl] | xstormy16 | xtensa \
-	| z8k)
+	| z8k | z80)
 		basic_machine=$basic_machine-unknown
 		;;
 	m6811 | m68hc11 | m6812 | m68hc12)
@@ -329,14 +334,17 @@ case $basic_machine in
 	| hppa-* | hppa1.[01]-* | hppa2.0-* | hppa2.0[nw]-* | hppa64-* \
 	| i*86-* | i860-* | i960-* | ia64-* \
 	| ip2k-* | iq2000-* \
+	| lm32-* \
 	| m32c-* | m32r-* | m32rle-* \
 	| m68000-* | m680[012346]0-* | m68360-* | m683?2-* | m68k-* \
-	| m88110-* | m88k-* | maxq-* | mcore-* \
+	| m88110-* | m88k-* | maxq-* | mcore-* | metag-* \
 	| mips-* | mipsbe-* | mipseb-* | mipsel-* | mipsle-* \
 	| mips16-* \
 	| mips64-* | mips64el-* \
-	| mips64vr-* | mips64vrel-* \
+	| mips64octeon-* | mips64octeonel-* \
 	| mips64orion-* | mips64orionel-* \
+	| mips64r5900-* | mips64r5900el-* \
+	| mips64vr-* | mips64vrel-* \
 	| mips64vr4100-* | mips64vr4100el-* \
 	| mips64vr4300-* | mips64vr4300el-* \
 	| mips64vr5000-* | mips64vr5000el-* \
@@ -358,20 +366,20 @@ case $basic_machine in
 	| powerpc-* | powerpc64-* | powerpc64le-* | powerpcle-* | ppcbe-* \
 	| pyramid-* \
 	| romp-* | rs6000-* \
-	| sh-* | sh[1234]-* | sh[24]a-* | sh[23]e-* | sh[34]eb-* | sheb-* | shbe-* \
+	| sh-* | sh[1234]-* | sh[24]a-* | sh[24]aeb-* | sh[23]e-* | sh[34]eb-* | sheb-* | shbe-* \
 	| shle-* | sh[1234]le-* | sh3ele-* | sh64-* | sh64le-* \
 	| sparc-* | sparc64-* | sparc64b-* | sparc64v-* | sparc86x-* | sparclet-* \
 	| sparclite-* \
 	| sparcv8-* | sparcv9-* | sparcv9b-* | sparcv9v-* | strongarm-* | sv1-* | sx?-* \
 	| tahoe-* | thumb-* \
-	| tic30-* | tic4x-* | tic54x-* | tic55x-* | tic6x-* | tic80-* \
+	| tic30-* | tic4x-* | tic54x-* | tic55x-* | tic6x-* | tic80-* | tile-* \
 	| tron-* \
 	| v850-* | v850e-* | vax-* \
 	| we32k-* \
 	| x86-* | x86_64-* | xc16x-* | xps100-* | xscale-* | xscalee[bl]-* \
 	| xstormy16-* | xtensa*-* \
 	| ymp-* \
-	| z8k-*)
+	| z8k-* | z80-*)
 		;;
 	# Recognize the basic CPU types without company name, with glob match.
 	xtensa*)
@@ -439,6 +447,10 @@ case $basic_machine in
 		basic_machine=m68k-apollo
 		os=-bsd
 		;;
+	aros)
+		basic_machine=i386-pc
+		os=-aros
+		;;
 	aux)
 		basic_machine=m68k-apple
 		os=-aux
@@ -459,6 +471,10 @@ case $basic_machine in
 		basic_machine=c90-cray
 		os=-unicos
 		;;
+        cegcc)
+		basic_machine=arm-unknown
+		os=-cegcc
+		;;
 	convex-c1)
 		basic_machine=c1-convex
 		os=-bsd
@@ -526,6 +542,10 @@ case $basic_machine in
 		basic_machine=m88k-motorola
 		os=-sysv3
 		;;
+	dicos)
+		basic_machine=i686-pc
+		os=-dicos
+		;;
 	djgpp)
 		basic_machine=i586-pc
 		os=-msdosdjgpp
@@ -1128,6 +1148,10 @@ case $basic_machine in
 		basic_machine=z8k-unknown
 		os=-sim
 		;;
+	z80-*-coff)
+		basic_machine=z80-unknown
+		os=-sim
+		;;
 	none)
 		basic_machine=none-none
 		os=-none
@@ -1166,7 +1190,7 @@ case $basic_machine in
 	we32k)
 		basic_machine=we32k-att
 		;;
-	sh[1234] | sh[24]a | sh[34]eb | sh[1234]le | sh[23]ele)
+	sh[1234] | sh[24]a | sh[24]aeb | sh[34]eb | sh[1234]le | sh[23]ele)
 		basic_machine=sh-unknown
 		;;
 	sparc | sparcv8 | sparcv9 | sparcv9b | sparcv9v)
@@ -1238,8 +1262,9 @@ case $os in
 	-gnu* | -bsd* | -mach* | -minix* | -genix* | -ultrix* | -irix* \
 	      | -*vms* | -sco* | -esix* | -isc* | -aix* | -sunos | -sunos[34]*\
 	      | -hpux* | -unos* | -osf* | -luna* | -dgux* | -solaris* | -sym* \
+	      | -kopensolaris* \
 	      | -amigaos* | -amigados* | -msdos* | -newsos* | -unicos* | -aof* \
-	      | -aos* \
+	      | -aos* | -aros* \
 	      | -nindy* | -vxsim* | -vxworks* | -ebmon* | -hms* | -mvs* \
 	      | -clix* | -riscos* | -uniplus* | -iris* | -rtu* | -xenix* \
 	      | -hiux* | -386bsd* | -knetbsd* | -mirbsd* | -netbsd* \
@@ -1248,7 +1273,7 @@ case $os in
 	      | -bosx* | -nextstep* | -cxux* | -aout* | -elf* | -oabi* \
 	      | -ptx* | -coff* | -ecoff* | -winnt* | -domain* | -vsta* \
 	      | -udi* | -eabi* | -lites* | -ieee* | -go32* | -aux* \
-	      | -chorusos* | -chorusrdb* \
+	      | -chorusos* | -chorusrdb* | -cegcc* \
 	      | -cygwin* | -pe* | -psos* | -moss* | -proelf* | -rtems* \
 	      | -mingw32* | -linux-gnu* | -linux-newlib* | -linux-uclibc* \
 	      | -uxpv* | -beos* | -mpeix* | -udk* \
@@ -1388,6 +1413,9 @@ case $os in
 	-zvmoe)
 		os=-zvmoe
 		;;
+	-dicos*)
+		os=-dicos
+		;;
 	-none)
 		;;
 	*)

configure.ac

@@ -18,15 +18,15 @@ AC_PREREQ(2.59)
 
 dnl Version number stuff here:
 
-AC_INIT([libpng], [1.0.41], [png-mng-implement@lists.sourceforge.net])
+AC_INIT([libpng], [1.0.50], [png-mng-implement@lists.sourceforge.net])
 AM_INIT_AUTOMAKE
 dnl stop configure from automagically running automake
 AM_MAINTAINER_MODE
 
-PNGLIB_VERSION=1.0.41
+PNGLIB_VERSION=1.0.50
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=0
-PNGLIB_RELEASE=41
+PNGLIB_RELEASE=50
 
 dnl End of version number stuff
 

contrib/visupng/PngFile.c

@@ -2,8 +2,11 @@
 //  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
+// Copyright 2000, Willem van Schaik.
+//
+// This code is released under the libpng license.
+// For conditions of distribution and use, see the disclaimer
+// and license in png.h
 
 #include <windows.h>
 #include <commdlg.h>

contrib/visupng/PngFile.h

@@ -2,8 +2,11 @@
 //  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
+// Copyright 2000, Willem van Schaik.
+
+// This code is released under the libpng license.
+// For conditions of distribution and use, see the disclaimer
+// and license in png.h
 
 #include <stdio.h>
 #include <stdlib.h>

contrib/visupng/README.txt

@@ -1,8 +1,11 @@
 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
+Copyright 2000, Willem van Schaik.
+
+This code is released under the libpng license.
+For conditions of distribution and use, see the disclaimer
+and license 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 

contrib/visupng/VisualPng.c

@@ -2,8 +2,11 @@
 //  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
+// Copyright 2000, Willem van Schaik.
+
+// This code is released under the libpng license.
+// For conditions of distribution and use, see the disclaimer
+// and license in png.h
 
 // switches
 

depcomp

@@ -1,10 +1,10 @@
 #! /bin/sh
 # depcomp - compile a program generating dependencies as side-effects
 
-scriptversion=2007-03-29.01
+scriptversion=2009-04-28.21; # UTC
 
-# Copyright (C) 1999, 2000, 2003, 2004, 2005, 2006, 2007 Free Software
-# Foundation, Inc.
+# Copyright (C) 1999, 2000, 2003, 2004, 2005, 2006, 2007, 2009 Free
+# Software Foundation, Inc.
 
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -17,9 +17,7 @@ scriptversion=2007-03-29.01
 # GNU General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
-# 02110-1301, USA.
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 # As a special exception to the GNU General Public License, if you
 # distribute this file as part of a program that contains a
@@ -87,6 +85,15 @@ if test "$depmode" = dashXmstdout; then
    depmode=dashmstdout
 fi
 
+cygpath_u="cygpath -u -f -"
+if test "$depmode" = msvcmsys; then
+   # This is just like msvisualcpp but w/o cygpath translation.
+   # Just convert the backslash-escaped backslashes to single forward
+   # slashes to satisfy depend.m4
+   cygpath_u="sed s,\\\\\\\\,/,g"
+   depmode=msvisualcpp
+fi
+
 case "$depmode" in
 gcc3)
 ## gcc 3 implements dependency tracking that does exactly what
@@ -192,14 +199,14 @@ sgi)
 ' < "$tmpdepfile" \
     | sed -e 's/^.*\.o://' -e 's/#.*$//' -e '/^$/ d' | \
     tr '
-' ' ' >> $depfile
-    echo >> $depfile
+' ' ' >> "$depfile"
+    echo >> "$depfile"
 
     # The second pass generates a dummy entry for each header file.
     tr ' ' '
 ' < "$tmpdepfile" \
    | sed -e 's/^.*\.o://' -e 's/#.*$//' -e '/^$/ d' -e 's/$/:/' \
-   >> $depfile
+   >> "$depfile"
   else
     # The sourcefile does not contain any dependencies, so just
     # store a dummy comment line, to avoid errors with the Makefile
@@ -328,7 +335,12 @@ hp2)
   if test -f "$tmpdepfile"; then
     sed -e "s,^.*\.[a-z]*:,$object:," "$tmpdepfile" > "$depfile"
     # Add `dependent.h:' lines.
-    sed -ne '2,${; s/^ *//; s/ \\*$//; s/$/:/; p;}' "$tmpdepfile" >> "$depfile"
+    sed -ne '2,${
+	       s/^ *//
+	       s/ \\*$//
+	       s/$/:/
+	       p
+	     }' "$tmpdepfile" >> "$depfile"
   else
     echo "#dummy" > "$depfile"
   fi
@@ -404,7 +416,7 @@ dashmstdout)
 
   # Remove the call to Libtool.
   if test "$libtool" = yes; then
-    while test $1 != '--mode=compile'; do
+    while test "X$1" != 'X--mode=compile'; do
       shift
     done
     shift
@@ -455,32 +467,39 @@ makedepend)
   "$@" || exit $?
   # Remove any Libtool call
   if test "$libtool" = yes; then
-    while test $1 != '--mode=compile'; do
+    while test "X$1" != 'X--mode=compile'; do
       shift
     done
     shift
   fi
   # X makedepend
   shift
-  cleared=no
-  for arg in "$@"; do
+  cleared=no eat=no
+  for arg
+  do
     case $cleared in
     no)
       set ""; shift
       cleared=yes ;;
     esac
+    if test $eat = yes; then
+      eat=no
+      continue
+    fi
     case "$arg" in
     -D*|-I*)
       set fnord "$@" "$arg"; shift ;;
     # Strip any option that makedepend may not understand.  Remove
     # the object too, otherwise makedepend will parse it as a source file.
+    -arch)
+      eat=yes ;;
     -*|$object)
       ;;
     *)
       set fnord "$@" "$arg"; shift ;;
     esac
   done
-  obj_suffix="`echo $object | sed 's/^.*\././'`"
+  obj_suffix=`echo "$object" | sed 's/^.*\././'`
   touch "$tmpdepfile"
   ${MAKEDEPEND-makedepend} -o"$obj_suffix" -f"$tmpdepfile" "$@"
   rm -f "$depfile"
@@ -500,7 +519,7 @@ cpp)
 
   # Remove the call to Libtool.
   if test "$libtool" = yes; then
-    while test $1 != '--mode=compile'; do
+    while test "X$1" != 'X--mode=compile'; do
       shift
     done
     shift
@@ -538,13 +557,27 @@ cpp)
 
 msvisualcpp)
   # Important note: in order to support this mode, a compiler *must*
-  # always write the preprocessed file to stdout, regardless of -o,
-  # because we must use -o when running libtool.
+  # always write the preprocessed file to stdout.
   "$@" || exit $?
+
+  # Remove the call to Libtool.
+  if test "$libtool" = yes; then
+    while test "X$1" != 'X--mode=compile'; do
+      shift
+    done
+    shift
+  fi
+
   IFS=" "
   for arg
   do
     case "$arg" in
+    -o)
+      shift
+      ;;
+    $object)
+      shift
+      ;;
     "-Gm"|"/Gm"|"-Gi"|"/Gi"|"-ZI"|"/ZI")
 	set fnord "$@"
 	shift
@@ -557,16 +590,23 @@ msvisualcpp)
 	;;
     esac
   done
-  "$@" -E |
-  sed -n '/^#line [0-9][0-9]* "\([^"]*\)"/ s::echo "`cygpath -u \\"\1\\"`":p' | sort | uniq > "$tmpdepfile"
+  "$@" -E 2>/dev/null |
+  sed -n '/^#line [0-9][0-9]* "\([^"]*\)"/ s::\1:p' | $cygpath_u | sort -u > "$tmpdepfile"
   rm -f "$depfile"
   echo "$object : \\" > "$depfile"
-  . "$tmpdepfile" | sed 's% %\\ %g' | sed -n '/^\(.*\)$/ s::	\1 \\:p' >> "$depfile"
+  sed < "$tmpdepfile" -n -e 's% %\\ %g' -e '/^\(.*\)$/ s::	\1 \\:p' >> "$depfile"
   echo "	" >> "$depfile"
-  . "$tmpdepfile" | sed 's% %\\ %g' | sed -n '/^\(.*\)$/ s::\1\::p' >> "$depfile"
+  sed < "$tmpdepfile" -n -e 's% %\\ %g' -e '/^\(.*\)$/ s::\1\::p' >> "$depfile"
   rm -f "$tmpdepfile"
   ;;
 
+msvcmsys)
+  # This case exists only to let depend.m4 do its work.  It works by
+  # looking at the text of this script.  This case will never be run,
+  # since it is checked for above.
+  exit 1
+  ;;
+
 none)
   exec "$@"
   ;;
@@ -585,5 +625,6 @@ exit 0
 # eval: (add-hook 'write-file-hooks 'time-stamp)
 # time-stamp-start: "scriptversion="
 # time-stamp-format: "%:y-%02m-%02d.%02H"
-# time-stamp-end: "$"
+# time-stamp-time-zone: "UTC"
+# time-stamp-end: "; # UTC"
 # End:

example.c

@@ -2,9 +2,9 @@
 #if 0 /* in case someone actually tries to compile this */
 
 /* example.c - an example of using libpng
- * Last changed in libpng 1.2.33 [October 31, 2008]
+ * Last changed in libpng 1.2.37 [June 4, 2009]
  * This file has been placed in the public domain by the authors.
- * Maintained 1998-2008 Glenn Randers-Pehrson
+ * Maintained 1998-2009 Glenn Randers-Pehrson
  * Maintained 1996, 1997 Andreas Dilger)
  * Written 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  */
@@ -91,14 +91,15 @@ void read_png(char *file_name)  /* We need to open the file */
 
    if ((fp = fopen(file_name, "rb")) == NULL)
       return (ERROR);
+
 #else no_open_file /* prototype 2 */
-void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
+void read_png(FILE *fp, unsigned int sig_read)  /* File is already open */
 {
    png_structp png_ptr;
    png_infop info_ptr;
    png_uint_32 width, height;
    int bit_depth, color_type, interlace_type;
-#endif no_open_file /* only use one prototype! */
+#endif no_open_file /* Only use one prototype! */
 
    /* Create and initialize the png_struct with the desired error handler
     * functions.  If you want to use the default stderr and longjump method,
@@ -164,6 +165,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
     * pixels) into the info structure with this call:
     */
    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 */
 
@@ -175,13 +177,13 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
    png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
        &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
- * transformations only work on specific types of images, and many
- * are mutually exclusive.
- */
+   /* Set up the data transformations you want.  Note that these are all
+    * optional.  Only call them if you want/need them.  Many of the
+    * transformations only work on specific types of images, and many
+    * are mutually exclusive.
+    */
 
-   /* tell libpng to strip 16 bit/color files down to 8 bits/color */
+   /* Tell libpng to strip 16 bit/color files down to 8 bits/color */
    png_set_strip_16(png_ptr);
 
    /* Strip alpha bytes from the input data without combining with the
@@ -228,10 +230,11 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
       png_set_background(png_ptr, &my_background,
                          PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0);
 
-   /* Some suggestions as to how to get a screen gamma value */
-
-   /* Note that screen gamma is the display_exponent, which includes
-    * the CRT_exponent and any correction for viewing conditions */
+   /* Some suggestions as to how to get a screen gamma value
+    *
+    * Note that screen gamma is the display_exponent, which includes
+    * the CRT_exponent and any correction for viewing conditions
+    */
    if (/* We have a user-defined screen gamma value */)
    {
       screen_gamma = user-defined screen_gamma;
@@ -244,7 +247,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
    /* If we don't have another value */
    else
    {
-      screen_gamma = 2.2;  /* A good guess for a PC monitors in a dimly
+      screen_gamma = 2.2;  /* A good guess for a PC monitor in a dimly
                               lit room */
       screen_gamma = 1.7 or 1.0;  /* A good guess for Mac systems */
    }
@@ -277,7 +280,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
       png_colorp palette;
 
       /* This reduces the image to the application supplied palette */
-      if (/* we have our own palette */)
+      if (/* We have our own palette */)
       {
          /* An array of colors to which the image should be dithered */
          png_color std_color_cube[MAX_SCREEN_COLORS];
@@ -297,7 +300,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
       }
    }
 
-   /* invert monochrome 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
@@ -306,20 +309,20 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
     */
    if (png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT))
    {
-      png_color_8p sig_bit;
+      png_color_8p sig_bit_p;
 
-      png_get_sBIT(png_ptr, info_ptr, &sig_bit);
-      png_set_shift(png_ptr, sig_bit);
+      png_get_sBIT(png_ptr, info_ptr, &sig_bit_p);
+      png_set_shift(png_ptr, sig_bit_p);
    }
 
-   /* flip the RGB pixels to BGR (or RGBA to BGRA) */
+   /* Flip the RGB pixels to BGR (or RGBA to BGRA) */
    if (color_type & PNG_COLOR_MASK_COLOR)
       png_set_bgr(png_ptr);
 
-   /* swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) */
+   /* Swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) */
    png_set_swap_alpha(png_ptr);
 
-   /* swap bytes of 16 bit files to least significant byte first */
+   /* Swap bytes of 16 bit files to least significant byte first */
    png_set_swap(png_ptr);
 
    /* Add filler (or alpha) byte (before/after each RGB triplet) */
@@ -342,11 +345,13 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
    /* The easiest way to read the image: */
    png_bytep row_pointers[height];
 
+   /* Clear the pointer array */
+   for (row = 0; row < height; row++)
+      row_pointers[row] = NULL;
+
    for (row = 0; row < height; row++)
-   {
       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 */
 #ifdef entire /* Read the entire image in one go */
@@ -372,32 +377,31 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
 #else no_sparkle /* Read the image using the "rectangle" effect */
          png_read_rows(png_ptr, png_bytepp_NULL, &row_pointers[y],
             number_of_rows);
-#endif no_sparkle /* use only one of these two methods */
+#endif no_sparkle /* Use only one of these two methods */
       }
 
-      /* if you want to display the image after every pass, do
-         so here */
-#endif no_single /* use only one of these two methods */
+      /* If you want to display the image after every pass, do so here */
+#endif no_single /* Use only one of these two methods */
    }
-#endif no_entire /* use only one of these two methods */
+#endif no_entire /* Use only one of these two methods */
 
-   /* read rest of file, and get additional chunks in info_ptr - REQUIRED */
+   /* Read rest of file, and get additional chunks in info_ptr - REQUIRED */
    png_read_end(png_ptr, info_ptr);
 #endif hilevel
 
    /* At this point you have read the entire image */
 
-   /* clean up after the read, and free any memory allocated - REQUIRED */
+   /* Clean up after the read, and free any memory allocated - REQUIRED */
    png_destroy_read_struct(&png_ptr, &info_ptr, png_infopp_NULL);
 
-   /* close the file */
+   /* Close the file */
    fclose(fp);
 
-   /* that's it */
+   /* That's it */
    return (OK);
 }
 
-/* progressively read a file */
+/* Progressively read a file */
 
 int
 initialize_png_reader(png_structp *png_ptr, png_infop *info_ptr)
@@ -462,7 +466,7 @@ process_data(png_structp *png_ptr, png_infop *info_ptr,
 
    /* This one's new also.  Simply give it chunks of data as
     * they arrive from the data stream (in order, of course).
-    * On Segmented machines, don't give it any more than 64K.
+    * On segmented machines, don't give it any more than 64K.
     * The library seems to run fine with sizes of 4K, although
     * you can give it much less if necessary (I assume you can
     * give it chunks of 1 byte, but I haven't tried with less
@@ -476,34 +480,35 @@ process_data(png_structp *png_ptr, png_infop *info_ptr,
 
 info_callback(png_structp png_ptr, png_infop info)
 {
-/* do any setup here, including setting any of the transformations
- * mentioned in the Reading PNG files section.  For now, you _must_
- * call either png_start_read_image() or png_read_update_info()
- * after all the transformations are set (even if you don't set
- * any).  You may start getting rows before png_process_data()
- * returns, so this is your last chance to prepare for that.
- */
+   /* Do any setup here, including setting any of the transformations
+    * mentioned in the Reading PNG files section.  For now, you _must_
+    * call either png_start_read_image() or png_read_update_info()
+    * after all the transformations are set (even if you don't set
+    * any).  You may start getting rows before png_process_data()
+    * returns, so this is your last chance to prepare for that.
+    */
 }
 
 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 interlaced, and you turned on the interlace handler,
- * this function will be called for every row in every pass.
- *
- * 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:
- */
+   /*
+    * 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.
+    *
+    * 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))
    {
@@ -518,44 +523,44 @@ row_callback(png_structp png_ptr, png_bytep new_row,
      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 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:
- */
+   /*
+    * 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 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);
 
-/* where old_row is what was displayed for previous rows.  Note
- * 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 as new_row, and the function will combine
- * the old row and the new row.
- */
+   /* where old_row is what was displayed for previous rows.  Note
+    * 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 as new_row, and the function will combine
+    * the old row and the new row.
+    */
 }
 
 end_callback(png_structp png_ptr, png_infop info)
 {
-/* this function is called when the whole image has been read,
- * including any chunks after the image (up to and including
- * the IEND).  You will usually have the same info chunk as you
- * had in the header, although some data may have been added
- * to the comments and time fields.
- *
- * Most people won't do much here, perhaps setting a flag that
- * marks the image as finished.
- */
+   /* This function is called when the whole image has been read,
+    * including any chunks after the image (up to and including
+    * the IEND).  You will usually have the same info chunk as you
+    * had in the header, although some data may have been added
+    * to the comments and time fields.
+    *
+    * Most people won't do much here, perhaps setting a flag that
+    * marks the image as finished.
+    */
 }
 
-/* write a png file */
+/* Write a png file */
 void write_png(char *file_name /* , ... other image information ... */)
 {
    FILE *fp;
@@ -563,7 +568,7 @@ void write_png(char *file_name /* , ... other image information ... */)
    png_infop info_ptr;
    png_colorp palette;
 
-   /* open the file */
+   /* Open the file */
    fp = fopen(file_name, "wb");
    if (fp == NULL)
       return (ERROR);
@@ -597,30 +602,34 @@ void write_png(char *file_name /* , ... other image information ... */)
     */
    if (setjmp(png_jmpbuf(png_ptr)))
    {
-      /* If we get here, we had a problem reading the file */
+      /* If we get here, we had a problem writing the file */
       fclose(fp);
       png_destroy_write_struct(&png_ptr, &info_ptr);
       return (ERROR);
    }
 
    /* One of the following I/O initialization functions is REQUIRED */
+
 #ifdef streams /* I/O initialization method 1 */
-   /* set up the output control if you are using standard C streams */
+   /* Set up the output control if you are using standard C streams */
    png_init_io(png_ptr, fp);
+
 #else no_streams /* I/O initialization method 2 */
    /* If you are using replacement write functions, instead of calling
-    * png_init_io() here you would call */
+    * png_init_io() here you would call
+    */
    png_set_write_fn(png_ptr, (void *)user_io_ptr, user_write_fn,
       user_IO_flush_function);
    /* where user_io_ptr is a structure you want available to the callbacks */
-#endif no_streams /* only use one initialization method */
+#endif no_streams /* Only use one initialization method */
 
 #ifdef hilevel
    /* This is the easy way.  Use it if you already have all the
-    * image info living info in the structure.  You could "|" many
+    * image info living in the structure.  You could "|" many
     * PNG_TRANSFORM flags into the png_transforms integer here.
     */
    png_write_png(png_ptr, info_ptr, png_transforms, png_voidp_NULL);
+
 #else
    /* This is the hard way */
 
@@ -635,25 +644,27 @@ void write_png(char *file_name /* , ... other image information ... */)
    png_set_IHDR(png_ptr, info_ptr, width, height, bit_depth, PNG_COLOR_TYPE_???,
       PNG_INTERLACE_????, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
 
-   /* set the palette if there is one.  REQUIRED for indexed-color images */
+   /* Set the palette if there is one.  REQUIRED for indexed-color images */
    palette = (png_colorp)png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH
              * png_sizeof(png_color));
-   /* ... set palette colors ... */
+   /* ... Set palette colors ... */
    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. */
+    * the palette that you malloced.  Wait until you are about to destroy
+    * the png structure.
+    */
 
-   /* optional significant bit chunk */
-   /* if we are dealing with a grayscale image then */
+   /* Optional significant bit (sBIT) chunk */
+   png_color_8 sig_bit;
+   /* If we are dealing with a grayscale image then */
    sig_bit.gray = true_bit_depth;
-   /* otherwise, if we are dealing with a color image then */
+   /* Otherwise, if we are dealing with a color image then */
    sig_bit.red = true_red_bit_depth;
    sig_bit.green = true_green_bit_depth;
    sig_bit.blue = true_blue_bit_depth;
-   /* if the image has an alpha channel then */
+   /* If the image has an alpha channel then */
    sig_bit.alpha = true_alpha_bit_depth;
-   png_set_sBIT(png_ptr, info_ptr, sig_bit);
+   png_set_sBIT(png_ptr, info_ptr, &sig_bit);
 
 
    /* Optional gamma chunk is strongly suggested if you have any guess
@@ -678,9 +689,12 @@ void write_png(char *file_name /* , ... other image information ... */)
 #endif
    png_set_text(png_ptr, info_ptr, text_ptr, 3);
 
-   /* other optional chunks like cHRM, bKGD, tRNS, tIME, oFFs, pHYs, */
-   /* note that if sRGB is present the gAMA and cHRM chunks must be ignored
-    * on read and must be written in accordance with the sRGB profile */
+   /* Other optional chunks like cHRM, bKGD, tRNS, tIME, oFFs, pHYs */
+
+   /* Note that if sRGB is present the gAMA and cHRM chunks must be ignored
+    * on read and, if your application chooses to write them, they must
+    * be written in accordance with the sRGB profile
+    */
 
    /* Write the file header information.  REQUIRED */
    png_write_info(png_ptr, info_ptr);
@@ -692,7 +706,7 @@ void write_png(char *file_name /* , ... other image information ... */)
     *   write_my_chunk();
     *   png_write_info(png_ptr, info_ptr);
     *
-    * However, given the level of known- and unknown-chunk support in 1.1.0
+    * However, given the level of known- and unknown-chunk support in 1.2.0
     * and up, this should no longer be necessary.
     */
 
@@ -702,11 +716,11 @@ void write_png(char *file_name /* , ... other image information ... */)
     * at the end.
     */
 
-   /* set up the transformations you want.  Note that these are
+   /* Set up the transformations you want.  Note that these are
     * all optional.  Only call them if you want them.
     */
 
-   /* invert monochrome pixels */
+   /* Invert monochrome pixels */
    png_set_invert_mono(png_ptr);
 
    /* Shift the pixels up to a legal bit depth and fill in
@@ -714,10 +728,10 @@ void write_png(char *file_name /* , ... other image information ... */)
     */
    png_set_shift(png_ptr, &sig_bit);
 
-   /* pack pixels into bytes */
+   /* Pack pixels into bytes */
    png_set_packing(png_ptr);
 
-   /* swap location of alpha bytes from ARGB to RGBA */
+   /* Swap location of alpha bytes from ARGB to RGBA */
    png_set_swap_alpha(png_ptr);
 
    /* Get rid of filler (OR ALPHA) bytes, pack XRGB/RGBX/ARGB/RGBA into
@@ -725,16 +739,16 @@ void write_png(char *file_name /* , ... other image information ... */)
     */
    png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
 
-   /* flip BGR pixels to RGB */
+   /* Flip BGR pixels to RGB */
    png_set_bgr(png_ptr);
 
-   /* swap bytes of 16-bit files to most significant byte first */
+   /* Swap bytes of 16-bit files to most significant byte first */
    png_set_swap(png_ptr);
 
-   /* swap bits of 1, 2, 4 bit packed pixel formats */
+   /* Swap bits of 1, 2, 4 bit packed pixel formats */
    png_set_packswap(png_ptr);
 
-   /* turn on interlace handling if you are not using png_write_image() */
+   /* Turn on interlace handling if you are not using png_write_image() */
    if (interlacing)
       number_passes = png_set_interlace_handling(png_ptr);
    else
@@ -755,12 +769,14 @@ void write_png(char *file_name /* , ... other image information ... */)
      row_pointers[k] = image + k*width*bytes_per_pixel;
 
    /* One of the following output methods is REQUIRED */
-#ifdef entire /* write out the entire image data in one call */
+
+#ifdef entire /* Write out the entire image data in one call */
    png_write_image(png_ptr, row_pointers);
 
-   /* the other way to write the image - deal with interlacing */
+   /* The other way to write the image - deal with interlacing */
+
+#else no_entire /* Write out the image data by one or more scanlines */
 
-#else no_entire /* write out the image data by one or more scanlines */
    /* The number of passes is either 1 for non-interlaced images,
     * or 7 for interlaced images.
     */
@@ -771,14 +787,12 @@ void write_png(char *file_name /* , ... other image information ... */)
 
       /* If you are only writing one row at a time, this works */
       for (y = 0; y < height; y++)
-      {
          png_write_rows(png_ptr, &row_pointers[y], 1);
-      }
    }
-#endif no_entire /* use only one output method */
+#endif no_entire /* Use only one output method */
 
    /* You can write optional chunks like tEXt, zTXt, and tIME at the end
-    * as well.  Shouldn't be necessary in 1.1.0 and up as all the public
+    * as well.  Shouldn't be necessary in 1.2.0 and up as all the public
     * chunks are supported and you can use png_set_unknown_chunks() to
     * register unknown chunks into the info structure to be written out.
     */
@@ -788,26 +802,33 @@ void write_png(char *file_name /* , ... other image information ... */)
 #endif hilevel
 
    /* If you png_malloced a palette, free it here (don't free info_ptr->palette,
-      as recommended in versions 1.0.5m and earlier of this example; if
-      libpng mallocs info_ptr->palette, libpng will free it).  If you
-      allocated it with malloc() instead of png_malloc(), use free() instead
-      of png_free(). */
+    * as recommended in versions 1.0.5m and earlier of this example; if
+    * libpng mallocs info_ptr->palette, libpng will free it).  If you
+    * 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_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;
+   /* Whenever you use png_free() it is a good idea to set the pointer to
+    * NULL in case your application inadvertently tries to png_free() it
+    * again.  When png_free() sees a NULL it returns without action, thus
+    * avoiding the double-free security problem.
+    */
 
-   /* clean up after the write, and free any memory allocated */
+   /* Clean up after the write, and free any memory allocated */
    png_destroy_write_struct(&png_ptr, &info_ptr);
 
-   /* close the file */
+   /* Close the file */
    fclose(fp);
 
-   /* that's it */
+   /* That's it */
    return (OK);
 }
 

install-sh

@@ -1,7 +1,7 @@
 #!/bin/sh
 # install - install a program, script, or datafile
 
-scriptversion=2006-12-25.00
+scriptversion=2009-04-28.21; # UTC
 
 # This originates from X11R5 (mit/util/scripts/install.sh), which was
 # later released in X11R6 (xc/config/util/install.sh) with the
@@ -515,5 +515,6 @@ done
 # eval: (add-hook 'write-file-hooks 'time-stamp)
 # time-stamp-start: "scriptversion="
 # time-stamp-format: "%:y-%02m-%02d.%02H"
-# time-stamp-end: "$"
+# time-stamp-time-zone: "UTC"
+# time-stamp-end: "; # UTC"
 # End:

libpng-1.0.50.txt

@@ -1,17 +1,19 @@
 libpng.txt - A description on how to use and modify libpng
 
- libpng version 1.0.41 - October 31, 2008
+ libpng version 1.0.50 - September 10, 2009
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
- Copyright (c) 1998-2008 Glenn Randers-Pehrson
- For conditions of distribution and use, see copyright
- notice in png.h.
+ Copyright (c) 1998-2009 Glenn Randers-Pehrson
+
+ This document is released under the libpng license.
+ For conditions of distribution and use, see the disclaimer
+ and license in png.h
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.0.41 - October 31, 2008
+ libpng versions 0.97, January 1998, through 1.0.50 - September 10, 2009
  Updated and distributed by Glenn Randers-Pehrson
- Copyright (c) 1998-2008 Glenn Randers-Pehrson
+ Copyright (c) 1998-2009 Glenn Randers-Pehrson
 
  libpng 1.0 beta 6  version 0.96 May 28, 1997
  Updated and distributed by Andreas Dilger
@@ -141,9 +143,10 @@ so if it doesn't work, you don't have much to undo.  Of course, you
 will also want to insure that you are, in fact, dealing with a PNG
 file.  Libpng provides a simple check to see if a file is a PNG file.
 To use it, pass in the first 1 to 8 bytes of the file to the function
-png_sig_cmp(), and it will return 0 if the bytes match the corresponding
-bytes of the PNG signature, or nonzero otherwise.  Of course, the more bytes
-you pass in, the greater the accuracy of the prediction.
+png_sig_cmp(), and it will return 0 (false) if the bytes match the
+corresponding bytes of the PNG signature, or nonzero (true) otherwise.
+Of course, the more bytes you pass in, the greater the accuracy of the
+prediction.
 
 If you are intending to keep the file pointer open for use in libpng,
 you must ensure you don't read more than 8 bytes from the beginning
@@ -385,7 +388,6 @@ callback function:
          (int)sizeof(unused_chunks)/5);
     #endif
 
-
 The high-level read interface
 
 At this point there are two ways to proceed; through the high-level
@@ -450,6 +452,8 @@ row_pointers prior to calling png_read_png() with
          "Image is too wide to process in memory");
    row_pointers = png_malloc(png_ptr,
       height*png_sizeof(png_bytep));
+   for (int i=0; i<height, i++)
+      row_pointers[i]=NULL;  /* security precaution */
    for (int i=0; i<height, i++)
       row_pointers[i]=png_malloc(png_ptr,
          width*pixel_size);
@@ -824,7 +828,6 @@ in libpng version 1.0.4, with the function names expanded to improve code
 readability.  In some future version they may actually do different
 things.
 
-
 PNG can have files with 16 bits per channel.  If you only can handle
 8 bits per channel, this will strip the pixels down to 8 bit.
 
@@ -1666,7 +1669,7 @@ types.
        PNG_FILTER_NONE  | PNG_FILTER_VALUE_NONE |
        PNG_FILTER_SUB   | PNG_FILTER_VALUE_SUB  |
        PNG_FILTER_UP    | PNG_FILTER_VALUE_UP   |
-       PNG_FILTER_AVE   | PNG_FILTER_VALUE_AVE  |
+       PNG_FILTER_AVG   | PNG_FILTER_VALUE_AVG  |
        PNG_FILTER_PAETH | PNG_FILTER_VALUE_PAETH|
        PNG_ALL_FILTERS);
 
@@ -1756,10 +1759,14 @@ Some of the more important parts of the png_info are:
                      PNG_INTRAPIXEL_DIFFERENCING)
 
 If you call png_set_IHDR(), the call must appear before any of the
-other png_set_*() functions, which might require access to some of
+other png_set_*() functions, because they might require access to some of
 the IHDR settings.  The remaining png_set_*() functions can be called
 in any order.
 
+If you wish, you can reset the compression_type, interlace_type, or
+filter_method later by calling png_set_IHDR() again; if you do this, the
+width, height, bit_depth, and color_type must be the same in each call.
+
     png_set_PLTE(png_ptr, info_ptr, palette,
        num_palette);
     palette        - the palette for the file
@@ -1821,8 +1828,9 @@ in any order.
        trans_values);
     trans          - array of transparent entries for
                      palette (PNG_INFO_tRNS)
-    trans_values   - graylevel or color sample values of
-                     the single transparent color for
+    trans_values   - graylevel or color sample values
+                     (in order red, green, blue) of the
+                     single transparent color for
                      non-paletted images (PNG_INFO_tRNS)
     num_trans      - number of transparent entries
                      (PNG_INFO_tRNS)
@@ -2031,7 +2039,12 @@ transformations are permitted, enabled by the following masks.
     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.
+    PNG_TRANSFORM_STRIP_FILLER        Strip out filler
+                                      bytes (deprecated).
+    PNG_TRANSFORM_STRIP_FILLER_BEFORE Strip out leading
+                                      filler bytes
+    PNG_TRANSFORM_STRIP_FILLER_AFTER  Strip out trailing
+                                      filler bytes
 
 If you have valid image data in the info structure (you can use
 png_set_rows() to put image data in the info structure), simply do this:
@@ -2438,9 +2451,15 @@ The replacement I/O functions must have prototypes as follows:
         png_bytep data, png_size_t length);
     void user_flush_data(png_structp png_ptr);
 
+The user_read_data() function is responsible for detecting and
+handling end-of-data errors.
+
 Supplying NULL for the read, write, or flush functions sets them back
-to using the default C stream functions.  It is an error to read from
-a write stream, and vice versa.
+to using the default C stream functions, which expect the io_ptr to
+point to a standard *FILE structure.  It is probably a mistake
+to use NULL for one of write_data_fn and output_flush_fn but not both
+of them, unless you have built libpng with PNG_NO_WRITE_FLUSH defined.
+It is an error to read from a write stream, and vice versa.
 
 Error handling in libpng is done through png_error() and png_warning().
 Errors handled through png_error() are fatal, meaning that png_error()
@@ -2545,11 +2564,12 @@ you may also have to change the memory allocators (png_malloc, etc.).
 
 Configuring for compiler xxx:
 
-All includes for libpng are in pngconf.h.  If you need to add/change/delete
-an include, this is the place to do it.  The includes that are not
-needed outside libpng are protected by the PNG_INTERNAL definition,
-which is only defined for those routines inside libpng itself.  The
-files in libpng proper only include png.h, which includes pngconf.h.
+All includes for libpng are in pngconf.h.  If you need to add, change
+or delete an include, this is the place to do it.
+The includes that are not needed outside libpng are protected by the
+PNG_INTERNAL definition, which is only defined for those routines inside
+libpng itself.  The files in libpng proper only include png.h, which
+includes pngconf.h.
 
 Configuring zlib:
 
@@ -2618,7 +2638,7 @@ currently does not allocate the filter buffers until png_write_row()
 is called for the first time.)
 
     filters = PNG_FILTER_NONE | PNG_FILTER_SUB
-              PNG_FILTER_UP | PNG_FILTER_AVE |
+              PNG_FILTER_UP | PNG_FILTER_AVG |
               PNG_FILTER_PAETH | PNG_ALL_FILTERS;
 
     png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE,
@@ -2740,7 +2760,7 @@ 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.
 
-VII.  MNG support
+VI.  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.
@@ -2814,15 +2834,142 @@ application:
 
    png_uint_32 application_vn = PNG_LIBPNG_VER;
 
-VIII. Y2K Compliance in libpng
+VIII.  (Omitted).
+IX.  (Omitted)
 
-October 31, 2008
+X. Detecting libpng
+
+The png_get_io_ptr() function has been present since libpng-0.88, has never
+changed, and is unaffected by conditional compilation macros.  It is the
+best choice for use in configure scripts for detecting the presence of any
+libpng version since 0.88.  In an autoconf "configure.in" you could use
+
+    AC_CHECK_LIB(png, png_get_io_ptr, ...
+
+XI. Source code repository
+
+Since about February 2009, version 1.2.34, libpng has been under "git" source
+control.  The git repository was built from old libpng-x.y.z.tar.gz files
+going back to version 0.70.  You can access the git repository (read only)
+at
+
+    git://libpng.git.sourceforge.net/gitroot/libpng
+
+or you can browse it via "gitweb" at
+
+    http://libpng.git.sourceforge.net/git/gitweb.cgi?p=libpng
+
+Patches can be sent to glennrp at users.sourceforge.net or to
+png-mng-implement at lists.sourceforge.net or you can upload them to
+the libpng bug tracker at
+
+    http://libpng.sourceforge.net
+
+XII. Coding style
+
+Our coding style is similar to the "Allman" style, with curly
+braces on separate lines:
+
+    if (condition)
+    {
+       action;
+    }
+
+    else if (another condition)
+    {
+       another action;
+    }
+
+The braces can be omitted from simple one-line actions:
+
+    if (condition)
+       return (0);
+
+We use 3-space indentation, except for continued statements which
+are usually indented the same as the first line of the statement
+plus four more spaces.
+
+Comments appear with the leading "/*" at the same indentation as
+the statement that follows the comment:
+
+    /* Single-line comment */
+    statement;
+
+    /* Multiple-line
+     * comment
+     */
+    statement;
+
+Very short comments can be placed at the end of the statement
+to which they pertain:
+
+    statement;    /* comment */
+
+We don't use C++ style ("//") comments. We have, however,
+used them in the past in some now-abandoned MMX assembler
+code.
+
+Functions and their curly braces are not indented, and
+exported functions are marked with PNGAPI:
+
+ /* This is a public function that is visible to
+  * application programers. It does thus-and-so.
+  */
+ void PNGAPI
+ png_exported_function(png_ptr, png_info, foo)
+ {
+    body;
+ }
+
+The prototypes for all exported functions appear in png.h,
+above the comment that says
+
+    /* Maintainer: Put new public prototypes here ... */
+
+We mark all non-exported functions with "/* PRIVATE */"":
+
+ void /* PRIVATE */
+ png_non_exported_function(png_ptr, png_info, foo)
+ {
+    body;
+ }
+
+The prototypes for non-exported functions (except for those in
+pngtest) appear in
+the PNG_INTERNAL section of png.h
+above the comment that says
+
+  /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
+
+The names of all exported functions and variables begin
+with  "png_", and all publicly visible C preprocessor
+macros begin with "PNG_".
+
+We put a space after each comma and after each semicolon
+in "for" statments, and we put spaces before and after each
+C binary operator and after "for" or "while".  We don't
+put a space between a typecast and the expression being
+cast, nor do we put one between a function name and the
+left parenthesis that follows it:
+
+    for (i = 2; i > 0; --i)
+       x[i] = a(x) + (int)b;
+
+We prefer #ifdef and #ifndef to #if defined() and if !defined()
+when there is only one macro being tested.
+
+Other rules can be inferred by inspecting the libpng
+source.
+
+XIII. Y2K Compliance in libpng
+
+September 10, 2009
 
 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 1.0.41 are Y2K compliant.  It is my belief that earlier
+upward through 1.0.50 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

libpng.3

@@ -1,6 +1,6 @@
-.TH LIBPNG 3 "October 31, 2008"
+.TH LIBPNG 3 "September 10, 2009"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.0.41
+libpng \- Portable Network Graphics (PNG) Reference Library 1.0.50
 .SH SYNOPSIS
 \fI\fB
 
@@ -821,18 +821,20 @@ Following is a copy of the libpng.txt file that accompanies libpng.
 .SH LIBPNG.TXT
 libpng.txt - A description on how to use and modify libpng
 
- libpng version 1.0.41 - October 31, 2008
+ libpng version 1.0.50 - September 10, 2009
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
- Copyright (c) 1998-2008 Glenn Randers-Pehrson
- For conditions of distribution and use, see copyright
- notice in png.h.
+ Copyright (c) 1998-2009 Glenn Randers-Pehrson
+
+ This document is released under the libpng license.
+ For conditions of distribution and use, see the disclaimer
+ and license in png.h
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.0.41 - October 31, 2008
+ libpng versions 0.97, January 1998, through 1.0.50 - September 10, 2009
  Updated and distributed by Glenn Randers-Pehrson
- Copyright (c) 1998-2008 Glenn Randers-Pehrson
+ Copyright (c) 1998-2009 Glenn Randers-Pehrson
 
  libpng 1.0 beta 6  version 0.96 May 28, 1997
  Updated and distributed by Andreas Dilger
@@ -962,9 +964,10 @@ so if it doesn't work, you don't have much to undo.  Of course, you
 will also want to insure that you are, in fact, dealing with a PNG
 file.  Libpng provides a simple check to see if a file is a PNG file.
 To use it, pass in the first 1 to 8 bytes of the file to the function
-png_sig_cmp(), and it will return 0 if the bytes match the corresponding
-bytes of the PNG signature, or nonzero otherwise.  Of course, the more bytes
-you pass in, the greater the accuracy of the prediction.
+png_sig_cmp(), and it will return 0 (false) if the bytes match the
+corresponding bytes of the PNG signature, or nonzero (true) otherwise.
+Of course, the more bytes you pass in, the greater the accuracy of the
+prediction.
 
 If you are intending to keep the file pointer open for use in libpng,
 you must ensure you don't read more than 8 bytes from the beginning
@@ -1206,7 +1209,6 @@ callback function:
          (int)sizeof(unused_chunks)/5);
     #endif
 
-
 .SS The high-level read interface
 
 At this point there are two ways to proceed; through the high-level
@@ -1271,6 +1273,8 @@ row_pointers prior to calling png_read_png() with
          "Image is too wide to process in memory");
    row_pointers = png_malloc(png_ptr,
       height*png_sizeof(png_bytep));
+   for (int i=0; i<height, i++)
+      row_pointers[i]=NULL;  /* security precaution */
    for (int i=0; i<height, i++)
       row_pointers[i]=png_malloc(png_ptr,
          width*pixel_size);
@@ -1645,7 +1649,6 @@ in libpng version 1.0.4, with the function names expanded to improve code
 readability.  In some future version they may actually do different
 things.
 
-
 PNG can have files with 16 bits per channel.  If you only can handle
 8 bits per channel, this will strip the pixels down to 8 bit.
 
@@ -2487,7 +2490,7 @@ types.
        PNG_FILTER_NONE  | PNG_FILTER_VALUE_NONE |
        PNG_FILTER_SUB   | PNG_FILTER_VALUE_SUB  |
        PNG_FILTER_UP    | PNG_FILTER_VALUE_UP   |
-       PNG_FILTER_AVE   | PNG_FILTER_VALUE_AVE  |
+       PNG_FILTER_AVG   | PNG_FILTER_VALUE_AVG  |
        PNG_FILTER_PAETH | PNG_FILTER_VALUE_PAETH|
        PNG_ALL_FILTERS);
 
@@ -2577,10 +2580,14 @@ Some of the more important parts of the png_info are:
                      PNG_INTRAPIXEL_DIFFERENCING)
 
 If you call png_set_IHDR(), the call must appear before any of the
-other png_set_*() functions, which might require access to some of
+other png_set_*() functions, because they might require access to some of
 the IHDR settings.  The remaining png_set_*() functions can be called
 in any order.
 
+If you wish, you can reset the compression_type, interlace_type, or
+filter_method later by calling png_set_IHDR() again; if you do this, the
+width, height, bit_depth, and color_type must be the same in each call.
+
     png_set_PLTE(png_ptr, info_ptr, palette,
        num_palette);
     palette        - the palette for the file
@@ -2642,8 +2649,9 @@ in any order.
        trans_values);
     trans          - array of transparent entries for
                      palette (PNG_INFO_tRNS)
-    trans_values   - graylevel or color sample values of
-                     the single transparent color for
+    trans_values   - graylevel or color sample values
+                     (in order red, green, blue) of the
+                     single transparent color for
                      non-paletted images (PNG_INFO_tRNS)
     num_trans      - number of transparent entries
                      (PNG_INFO_tRNS)
@@ -2852,7 +2860,12 @@ transformations are permitted, enabled by the following masks.
     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.
+    PNG_TRANSFORM_STRIP_FILLER        Strip out filler
+                                      bytes (deprecated).
+    PNG_TRANSFORM_STRIP_FILLER_BEFORE Strip out leading
+                                      filler bytes
+    PNG_TRANSFORM_STRIP_FILLER_AFTER  Strip out trailing
+                                      filler bytes
 
 If you have valid image data in the info structure (you can use
 png_set_rows() to put image data in the info structure), simply do this:
@@ -3259,9 +3272,15 @@ The replacement I/O functions must have prototypes as follows:
         png_bytep data, png_size_t length);
     void user_flush_data(png_structp png_ptr);
 
+The user_read_data() function is responsible for detecting and
+handling end-of-data errors.
+
 Supplying NULL for the read, write, or flush functions sets them back
-to using the default C stream functions.  It is an error to read from
-a write stream, and vice versa.
+to using the default C stream functions, which expect the io_ptr to
+point to a standard *FILE structure.  It is probably a mistake
+to use NULL for one of write_data_fn and output_flush_fn but not both
+of them, unless you have built libpng with PNG_NO_WRITE_FLUSH defined.
+It is an error to read from a write stream, and vice versa.
 
 Error handling in libpng is done through png_error() and png_warning().
 Errors handled through png_error() are fatal, meaning that png_error()
@@ -3366,11 +3385,12 @@ you may also have to change the memory allocators (png_malloc, etc.).
 
 .SS Configuring for compiler xxx:
 
-All includes for libpng are in pngconf.h.  If you need to add/change/delete
-an include, this is the place to do it.  The includes that are not
-needed outside libpng are protected by the PNG_INTERNAL definition,
-which is only defined for those routines inside libpng itself.  The
-files in libpng proper only include png.h, which includes pngconf.h.
+All includes for libpng are in pngconf.h.  If you need to add, change
+or delete an include, this is the place to do it.
+The includes that are not needed outside libpng are protected by the
+PNG_INTERNAL definition, which is only defined for those routines inside
+libpng itself.  The files in libpng proper only include png.h, which
+includes pngconf.h.
 
 .SS Configuring zlib:
 
@@ -3439,7 +3459,7 @@ currently does not allocate the filter buffers until png_write_row()
 is called for the first time.)
 
     filters = PNG_FILTER_NONE | PNG_FILTER_SUB
-              PNG_FILTER_UP | PNG_FILTER_AVE |
+              PNG_FILTER_UP | PNG_FILTER_AVG |
               PNG_FILTER_PAETH | PNG_ALL_FILTERS;
 
     png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE,
@@ -3561,7 +3581,7 @@ 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.
 
-.SH VII.  MNG support
+.SH VI.  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.
@@ -3635,15 +3655,142 @@ application:
 
    png_uint_32 application_vn = PNG_LIBPNG_VER;
 
-.SH VIII. Y2K Compliance in libpng
+.SH VIII.  (Omitted).
+.SH IX.  (Omitted)
 
-October 31, 2008
+.SH X. Detecting libpng
+
+The png_get_io_ptr() function has been present since libpng-0.88, has never
+changed, and is unaffected by conditional compilation macros.  It is the
+best choice for use in configure scripts for detecting the presence of any
+libpng version since 0.88.  In an autoconf "configure.in" you could use
+
+    AC_CHECK_LIB(png, png_get_io_ptr, ...
+
+.SH XI. Source code repository
+
+Since about February 2009, version 1.2.34, libpng has been under "git" source
+control.  The git repository was built from old libpng-x.y.z.tar.gz files
+going back to version 0.70.  You can access the git repository (read only)
+at
+
+    git://libpng.git.sourceforge.net/gitroot/libpng
+
+or you can browse it via "gitweb" at
+
+    http://libpng.git.sourceforge.net/git/gitweb.cgi?p=libpng
+
+Patches can be sent to glennrp at users.sourceforge.net or to
+png-mng-implement at lists.sourceforge.net or you can upload them to
+the libpng bug tracker at
+
+    http://libpng.sourceforge.net
+
+.SH XII. Coding style
+
+Our coding style is similar to the "Allman" style, with curly
+braces on separate lines:
+
+    if (condition)
+    {
+       action;
+    }
+
+    else if (another condition)
+    {
+       another action;
+    }
+
+The braces can be omitted from simple one-line actions:
+
+    if (condition)
+       return (0);
+
+We use 3-space indentation, except for continued statements which
+are usually indented the same as the first line of the statement
+plus four more spaces.
+
+Comments appear with the leading "/*" at the same indentation as
+the statement that follows the comment:
+
+    /* Single-line comment */
+    statement;
+
+    /* Multiple-line
+     * comment
+     */
+    statement;
+
+Very short comments can be placed at the end of the statement
+to which they pertain:
+
+    statement;    /* comment */
+
+We don't use C++ style ("//") comments. We have, however,
+used them in the past in some now-abandoned MMX assembler
+code.
+
+Functions and their curly braces are not indented, and
+exported functions are marked with PNGAPI:
+
+ /* This is a public function that is visible to
+  * application programers. It does thus-and-so.
+  */
+ void PNGAPI
+ png_exported_function(png_ptr, png_info, foo)
+ {
+    body;
+ }
+
+The prototypes for all exported functions appear in png.h,
+above the comment that says
+
+    /* Maintainer: Put new public prototypes here ... */
+
+We mark all non-exported functions with "/* PRIVATE */"":
+
+ void /* PRIVATE */
+ png_non_exported_function(png_ptr, png_info, foo)
+ {
+    body;
+ }
+
+The prototypes for non-exported functions (except for those in
+pngtest) appear in
+the PNG_INTERNAL section of png.h
+above the comment that says
+
+  /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
+
+The names of all exported functions and variables begin
+with  "png_", and all publicly visible C preprocessor
+macros begin with "PNG_".
+
+We put a space after each comma and after each semicolon
+in "for" statments, and we put spaces before and after each
+C binary operator and after "for" or "while".  We don't
+put a space between a typecast and the expression being
+cast, nor do we put one between a function name and the
+left parenthesis that follows it:
+
+    for (i = 2; i > 0; --i)
+       x[i] = a(x) + (int)b;
+
+We prefer #ifdef and #ifndef to #if defined() and if !defined()
+when there is only one macro being tested.
+
+Other rules can be inferred by inspecting the libpng
+source.
+
+.SH XIII. Y2K Compliance in libpng
+
+September 10, 2009
 
 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 1.0.41 are Y2K compliant.  It is my belief that earlier
+upward through 1.0.50 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
@@ -3895,6 +4042,36 @@ the first widely used release:
  1.0.41rc01          10    10041  10.so.0.41[.0]
  1.2.33              13    10233  12.so.0.33[.0]
  1.0.41              10    10041  10.so.0.41[.0]
+ 1.2.34beta01-07     13    10234  12.so.0.34[.0]
+ 1.0.42rc01          10    10042  10.so.0.42[.0]
+ 1.2.34rc01          13    10234  12.so.0.34[.0]
+ 1.0.42              10    10042  10.so.0.42[.0]
+ 1.2.34              13    10234  12.so.0.34[.0]
+ 1.2.35beta01-03     13    10235  12.so.0.35[.0]
+ 1.0.43rc01-02       10    10043  10.so.0.43[.0]
+ 1.2.35rc01-02       13    10235  12.so.0.35[.0]
+ 1.0.43              10    10043  10.so.0.43[.0]
+ 1.2.35              13    10235  12.so.0.35[.0]
+ 1.2.36beta01-05     13    10236  12.so.0.36[.0]
+ 1.2.36rc01          13    10236  12.so.0.36[.0]
+ 1.0.44              10    10044  10.so.0.44[.0]
+ 1.2.36              13    10236  12.so.0.36[.0]
+ 1.2.37beta01-03     13    10237  12.so.0.37[.0]
+ 1.2.37rc01          13    10237  12.so.0.37[.0]
+ 1.2.37              13    10237  12.so.0.37[.0]
+ 1.2.45              10    10045  12.so.0.45[.0]
+ 1.0.46              10    10046  10.so.0.46[.0]
+ 1.2.38beta01        13    10238  12.so.0.38[.0]
+ 1.2.38rc01-03       13    10238  12.so.0.38[.0]
+ 1.0.47              10    10047  10.so.0.47[.0]
+ 1.2.38              13    10238  12.so.0.38[.0]
+ 1.2.39beta01-05     13    10239  12.so.0.39[.0]
+ 1.2.39rc01          13    10239  12.so.0.39[.0]
+ 1.0.48              10    10048  10.so.0.48[.0]
+ 1.2.39              13    10239  12.so.0.39[.0]
+ 1.2.40rc01          13    10240  12.so.0.40[.0]
+ 1.0.49              10    10049  10.so.0.49[.0]
+ 1.2.40              13    10240  12.so.0.40[.0]
 
 Henceforth the source version will match the shared-library minor
 and patch numbers; the shared-library major version number will be
@@ -3950,7 +4127,7 @@ possible without all of you.
 
 Thanks to Frank J. T. Wojcik for helping with the documentation.
 
-Libpng version 1.0.41 - October 31, 2008:
+Libpng version 1.0.50 - September 10, 2009:
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).
 
@@ -3971,7 +4148,9 @@ included in the libpng distribution, the latter shall prevail.)
 If you modify libpng you may insert additional notices immediately following
 this sentence.
 
-libpng versions 1.2.6, August 15, 2004, through 1.0.41, October 31, 2008, are
+This code is released under the libpng license.
+
+libpng versions 1.2.6, August 15, 2004, through 1.0.50, September 10, 2009, are
 Copyright (c) 2004,2006-2008 Glenn Randers-Pehrson, and are
 distributed according to the same disclaimer and license as libpng-1.2.5
 with the following individual added to the list of Contributing Authors
@@ -4070,7 +4249,7 @@ certification mark of the Open Source Initiative.
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-October 31, 2008
+September 10, 2009
 
 .\" end of man page
 

libpngpf.3

@@ -1,6 +1,6 @@
-.TH LIBPNGPF 3 "October 31, 2008"
+.TH LIBPNGPF 3 "September 10, 2009"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.0.41
+libpng \- Portable Network Graphics (PNG) Reference Library 1.0.50
 (private functions)
 .SH SYNOPSIS
 \fB#include <png.h>\fP

missing

@@ -1,10 +1,10 @@
 #! /bin/sh
 # Common stub for a few missing GNU programs while installing.
 
-scriptversion=2006-05-10.23
+scriptversion=2009-04-28.21; # UTC
 
-# Copyright (C) 1996, 1997, 1999, 2000, 2002, 2003, 2004, 2005, 2006
-#   Free Software Foundation, Inc.
+# Copyright (C) 1996, 1997, 1999, 2000, 2002, 2003, 2004, 2005, 2006,
+# 2008, 2009 Free Software Foundation, Inc.
 # Originally by Fran,cois Pinard <pinard@iro.umontreal.ca>, 1996.
 
 # This program is free software; you can redistribute it and/or modify
@@ -18,9 +18,7 @@ scriptversion=2006-05-10.23
 # GNU General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
-# 02110-1301, USA.
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 # As a special exception to the GNU General Public License, if you
 # distribute this file as part of a program that contains a
@@ -89,6 +87,9 @@ Supported PROGRAM values:
   tar          try tar, gnutar, gtar, then tar without non-portable flags
   yacc         create \`y.tab.[ch]', if possible, from existing .[ch]
 
+Version suffixes to PROGRAM as well as the prefixes \`gnu-', \`gnu', and
+\`g' are ignored when checking the name.
+
 Send bug reports to <bug-automake@gnu.org>."
     exit $?
     ;;
@@ -106,15 +107,22 @@ Send bug reports to <bug-automake@gnu.org>."
 
 esac
 
+# normalize program name to check for.
+program=`echo "$1" | sed '
+  s/^gnu-//; t
+  s/^gnu//; t
+  s/^g//; t'`
+
 # Now exit if we have it, but it failed.  Also exit now if we
 # don't have it and --version was passed (most likely to detect
-# the program).
+# the program).  This is about non-GNU programs, so use $1 not
+# $program.
 case $1 in
-  lex|yacc)
+  lex*|yacc*)
     # Not GNU programs, they don't have --version.
     ;;
 
-  tar)
+  tar*)
     if test -n "$run"; then
        echo 1>&2 "ERROR: \`tar' requires --run"
        exit 1
@@ -138,7 +146,7 @@ esac
 
 # If it does not exist, or fails to run (possibly an outdated version),
 # try to emulate it.
-case $1 in
+case $program in
   aclocal*)
     echo 1>&2 "\
 WARNING: \`$1' is $msg.  You should only need it if
@@ -148,7 +156,7 @@ WARNING: \`$1' is $msg.  You should only need it if
     touch aclocal.m4
     ;;
 
-  autoconf)
+  autoconf*)
     echo 1>&2 "\
 WARNING: \`$1' is $msg.  You should only need it if
          you modified \`${configure_ac}'.  You might want to install the
@@ -157,7 +165,7 @@ WARNING: \`$1' is $msg.  You should only need it if
     touch configure
     ;;
 
-  autoheader)
+  autoheader*)
     echo 1>&2 "\
 WARNING: \`$1' is $msg.  You should only need it if
          you modified \`acconfig.h' or \`${configure_ac}'.  You might want
@@ -187,7 +195,7 @@ WARNING: \`$1' is $msg.  You should only need it if
 	   while read f; do touch "$f"; done
     ;;
 
-  autom4te)
+  autom4te*)
     echo 1>&2 "\
 WARNING: \`$1' is needed, but is $msg.
          You might have modified some files without having the
@@ -210,7 +218,7 @@ WARNING: \`$1' is needed, but is $msg.
     fi
     ;;
 
-  bison|yacc)
+  bison*|yacc*)
     echo 1>&2 "\
 WARNING: \`$1' $msg.  You should only need it if
          you modified a \`.y' file.  You may need the \`Bison' package
@@ -240,7 +248,7 @@ WARNING: \`$1' $msg.  You should only need it if
     fi
     ;;
 
-  lex|flex)
+  lex*|flex*)
     echo 1>&2 "\
 WARNING: \`$1' is $msg.  You should only need it if
          you modified a \`.l' file.  You may need the \`Flex' package
@@ -263,7 +271,7 @@ WARNING: \`$1' is $msg.  You should only need it if
     fi
     ;;
 
-  help2man)
+  help2man*)
     echo 1>&2 "\
 WARNING: \`$1' is $msg.  You should only need it if
 	 you modified a dependency of a manual page.  You may need the
@@ -277,11 +285,11 @@ WARNING: \`$1' is $msg.  You should only need it if
     else
 	test -z "$file" || exec >$file
 	echo ".ab help2man is required to generate this page"
-	exit 1
+	exit $?
     fi
     ;;
 
-  makeinfo)
+  makeinfo*)
     echo 1>&2 "\
 WARNING: \`$1' is $msg.  You should only need it if
          you modified a \`.texi' or \`.texinfo' file, or any other file
@@ -310,7 +318,7 @@ WARNING: \`$1' is $msg.  You should only need it if
     touch $file
     ;;
 
-  tar)
+  tar*)
     shift
 
     # We have already tried tar in the generic part.
@@ -363,5 +371,6 @@ exit 0
 # eval: (add-hook 'write-file-hooks 'time-stamp)
 # time-stamp-start: "scriptversion="
 # time-stamp-format: "%:y-%02m-%02d.%02H"
-# time-stamp-end: "$"
+# time-stamp-time-zone: "UTC"
+# time-stamp-end: "; # UTC"
 # End:

mkinstalldirs

@@ -1,7 +1,7 @@
 #! /bin/sh
 # mkinstalldirs --- make directory hierarchy
 
-scriptversion=2006-05-11.19
+scriptversion=2009-04-28.21; # UTC
 
 # Original author: Noah Friedman <friedman@prep.ai.mit.edu>
 # Created: 1993-05-16
@@ -157,5 +157,6 @@ exit $errstatus
 # eval: (add-hook 'write-file-hooks 'time-stamp)
 # time-stamp-start: "scriptversion="
 # time-stamp-format: "%:y-%02m-%02d.%02H"
-# time-stamp-end: "$"
+# time-stamp-time-zone: "UTC"
+# time-stamp-end: "; # UTC"
 # End:

png.5

@@ -1,4 +1,4 @@
-.TH PNG 5 "October 31, 2008"
+.TH PNG 5 "September 10, 2009"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION

png.c

@@ -1,11 +1,14 @@
 
 /* png.c - location for general purpose libpng functions
  *
- * Last changed in libpng 1.2.30 [August 15, 2008]
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2008 Glenn Randers-Pehrson
+ * Last changed in libpng 1.2.39 [August 13, 2009]
+ * Copyright (c) 1998-2009 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 code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
  */
 
 #define PNG_INTERNAL
@@ -13,7 +16,7 @@
 #include "png.h"
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_0_41 Your_png_h_is_not_version_1_0_41;
+typedef version_1_0_50 Your_png_h_is_not_version_1_0_50;
 
 /* Version information for C files.  This had better match the version
  * string defined in png.h.  */
@@ -53,18 +56,18 @@ PNG_tRNS;
 PNG_zTXt;
 
 #ifdef PNG_READ_SUPPORTED
-/* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+/* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
 
-/* start of interlace block */
+/* Start of interlace block */
 PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
 
-/* offset to next interlace block */
+/* Offset to next interlace block */
 PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
 
-/* start of interlace block in the y direction */
+/* Start of interlace block in the y direction */
 PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
 
-/* offset to next interlace block in the y direction */
+/* Offset to next interlace block in the y direction */
 PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
 
 /* Height of interlace block.  This is not currently used - if you need
@@ -92,8 +95,9 @@ PNG_CONST int FARDATA png_pass_dsp_mask[]
 void PNGAPI
 png_set_sig_bytes(png_structp png_ptr, int num_bytes)
 {
-   if (png_ptr == NULL) return;
-   png_debug(1, "in png_set_sig_bytes\n");
+   if (png_ptr == NULL)
+      return;
+   png_debug(1, "in png_set_sig_bytes");
    if (num_bytes > 8)
       png_error(png_ptr, "Too many bytes for PNG signature.");
 
@@ -144,7 +148,7 @@ png_check_sig(png_bytep sig, int num)
 #ifdef PNG_1_0_X
 voidpf PNGAPI
 #else
-voidpf /* private */
+voidpf /* PRIVATE */
 #endif
 png_zalloc(voidpf png_ptr, uInt items, uInt size)
 {
@@ -153,7 +157,8 @@ png_zalloc(voidpf png_ptr, uInt items, uInt size)
    png_uint_32 save_flags=p->flags;
    png_uint_32 num_bytes;
 
-   if (png_ptr == NULL) return (NULL);
+   if (png_ptr == NULL)
+      return (NULL);
    if (items > PNG_UINT_32_MAX/size)
    {
      png_warning (p, "Potential overflow in png_zalloc()");
@@ -183,11 +188,11 @@ png_zalloc(voidpf png_ptr, uInt items, uInt size)
    return ((voidpf)ptr);
 }
 
-/* function to free memory for zlib */
+/* Function to free memory for zlib */
 #ifdef PNG_1_0_X
 void PNGAPI
 #else
-void /* private */
+void /* PRIVATE */
 #endif
 png_zfree(voidpf png_ptr, voidpf ptr)
 {
@@ -240,8 +245,9 @@ png_create_info_struct(png_structp png_ptr)
 {
    png_infop info_ptr;
 
-   png_debug(1, "in png_create_info_struct\n");
-   if (png_ptr == NULL) return (NULL);
+   png_debug(1, "in png_create_info_struct");
+   if (png_ptr == NULL)
+      return (NULL);
 #ifdef PNG_USER_MEM_SUPPORTED
    info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO,
       png_ptr->malloc_fn, png_ptr->mem_ptr);
@@ -263,9 +269,10 @@ void PNGAPI
 png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr)
 {
    png_infop info_ptr = NULL;
-   if (png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
 
-   png_debug(1, "in png_destroy_info_struct\n");
+   png_debug(1, "in png_destroy_info_struct");
    if (info_ptr_ptr != NULL)
       info_ptr = *info_ptr_ptr;
 
@@ -302,18 +309,19 @@ png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size)
 {
    png_infop info_ptr = *ptr_ptr;
 
-   if (info_ptr == NULL) return;
+   if (info_ptr == NULL)
+      return;
 
-   png_debug(1, "in png_info_init_3\n");
+   png_debug(1, "in png_info_init_3");
 
    if (png_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;
-     }
+   {
+      png_destroy_struct(info_ptr);
+      info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
+      *ptr_ptr = info_ptr;
+   }
 
-   /* set everything to 0 */
+   /* Set everything to 0 */
    png_memset(info_ptr, 0, png_sizeof(png_info));
 }
 
@@ -322,7 +330,7 @@ void PNGAPI
 png_data_freer(png_structp png_ptr, png_infop info_ptr,
    int freer, png_uint_32 mask)
 {
-   png_debug(1, "in png_data_freer\n");
+   png_debug(1, "in png_data_freer");
    if (png_ptr == NULL || info_ptr == NULL)
       return;
    if (freer == PNG_DESTROY_WILL_FREE_DATA)
@@ -339,250 +347,250 @@ void PNGAPI
 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");
+   png_debug(1, "in png_free_data");
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
 #if defined(PNG_TEXT_SUPPORTED)
-/* free text item num or (if num == -1) all text items */
+   /* Free text item num or (if num == -1) all text items */
 #ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_TEXT) & info_ptr->free_me)
+   if ((mask & PNG_FREE_TEXT) & info_ptr->free_me)
 #else
-if (mask & PNG_FREE_TEXT)
+   if (mask & PNG_FREE_TEXT)
 #endif
-{
-   if (num != -1)
    {
-     if (info_ptr->text && info_ptr->text[num].key)
-     {
-         png_free(png_ptr, info_ptr->text[num].key);
-         info_ptr->text[num].key = NULL;
-     }
+      if (num != -1)
+      {
+         if (info_ptr->text && info_ptr->text[num].key)
+         {
+            png_free(png_ptr, info_ptr->text[num].key);
+            info_ptr->text[num].key = NULL;
+         }
+      }
+      else
+      {
+         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;
+      }
    }
-   else
-   {
-       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
 
 #if defined(PNG_tRNS_SUPPORTED)
-/* free any tRNS entry */
+   /* 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))
+   if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS))
 #endif
-{
-    png_free(png_ptr, info_ptr->trans);
-    info_ptr->trans = NULL;
-    info_ptr->valid &= ~PNG_INFO_tRNS;
+   {
+      png_free(png_ptr, info_ptr->trans);
+      info_ptr->trans = NULL;
+      info_ptr->valid &= ~PNG_INFO_tRNS;
 #ifndef PNG_FREE_ME_SUPPORTED
-    png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
+      png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
 #endif
-}
+   }
 #endif
 
 #if defined(PNG_sCAL_SUPPORTED)
-/* free any sCAL entry */
+   /* 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)
+   if (mask & PNG_FREE_SCAL)
 #endif
-{
+   {
 #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);
-    info_ptr->scal_s_width = NULL;
-    info_ptr->scal_s_height = NULL;
+      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 */
+   /* 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)
+   if (mask & PNG_FREE_PCAL)
 #endif
-{
-    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;
-}
+   {
+      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 */
+   /* 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)
+   if (mask & PNG_FREE_ICCP)
 #endif
-{
-    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;
-}
+   {
+      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 */
+   /* 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)
+   if (mask & PNG_FREE_SPLT)
 #endif
-{
-   if (num != -1)
    {
-      if (info_ptr->splt_palettes)
+      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->splt_palettes[num].name = NULL;
-          info_ptr->splt_palettes[num].entries = NULL;
+         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
+      {
+         if (info_ptr->splt_palettes_num)
+         {
+            int i;
+            for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
+               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;
       }
    }
-   else
-   {
-       if (info_ptr->splt_palettes_num)
-       {
-         int i;
-         for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
-            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)
-  if (png_ptr->unknown_chunk.data)
-  {
-    png_free(png_ptr, png_ptr->unknown_chunk.data);
-    png_ptr->unknown_chunk.data = NULL;
-  }
+   if (png_ptr->unknown_chunk.data)
+   {
+      png_free(png_ptr, png_ptr->unknown_chunk.data);
+      png_ptr->unknown_chunk.data = NULL;
+   }
 
 #ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
+   if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
 #else
-if (mask & PNG_FREE_UNKN)
+   if (mask & PNG_FREE_UNKN)
 #endif
-{
-   if (num != -1)
    {
-       if (info_ptr->unknown_chunks)
-       {
-          png_free(png_ptr, info_ptr->unknown_chunks[num].data);
-          info_ptr->unknown_chunks[num].data = NULL;
-       }
-   }
-   else
-   {
-       int i;
+      if (num != -1)
+      {
+          if (info_ptr->unknown_chunks)
+          {
+             png_free(png_ptr, info_ptr->unknown_chunks[num].data);
+             info_ptr->unknown_chunks[num].data = NULL;
+          }
+      }
+      else
+      {
+         int i;
 
-       if (info_ptr->unknown_chunks_num)
-       {
-         for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++)
-            png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i);
+         if (info_ptr->unknown_chunks_num)
+         {
+            for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++)
+               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;
-       }
+            png_free(png_ptr, info_ptr->unknown_chunks);
+            info_ptr->unknown_chunks = NULL;
+            info_ptr->unknown_chunks_num = 0;
+         }
+      }
    }
-}
 #endif
 
 #if defined(PNG_hIST_SUPPORTED)
-/* free any hIST entry */
+   /* 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))
+   if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST))
 #endif
-{
-    png_free(png_ptr, info_ptr->hist);
-    info_ptr->hist = NULL;
-    info_ptr->valid &= ~PNG_INFO_hIST;
+   {
+      png_free(png_ptr, info_ptr->hist);
+      info_ptr->hist = NULL;
+      info_ptr->valid &= ~PNG_INFO_hIST;
 #ifndef PNG_FREE_ME_SUPPORTED
-    png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
+      png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
 #endif
-}
+   }
 #endif
 
-/* free any PLTE entry that was internally allocated */
+   /* 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))
+   if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE))
 #endif
-{
-    png_zfree(png_ptr, info_ptr->palette);
-    info_ptr->palette = NULL;
-    info_ptr->valid &= ~PNG_INFO_PLTE;
+   {
+      png_zfree(png_ptr, info_ptr->palette);
+      info_ptr->palette = NULL;
+      info_ptr->valid &= ~PNG_INFO_PLTE;
 #ifndef PNG_FREE_ME_SUPPORTED
-    png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
+      png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
 #endif
-    info_ptr->num_palette = 0;
-}
+      info_ptr->num_palette = 0;
+   }
 
 #if defined(PNG_INFO_IMAGE_SUPPORTED)
-/* free any image bits attached to the info structure */
+   /* Free any image bits attached to the info structure */
 #ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_ROWS) & info_ptr->free_me)
+   if ((mask & PNG_FREE_ROWS) & info_ptr->free_me)
 #else
-if (mask & PNG_FREE_ROWS)
+   if (mask & PNG_FREE_ROWS)
 #endif
-{
-    if (info_ptr->row_pointers)
-    {
-       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;
-}
+   {
+      if (info_ptr->row_pointers)
+      {
+         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;
+      info_ptr->free_me &= ~mask;
    else
-     info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL);
+      info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL);
 #endif
 }
 
@@ -593,16 +601,16 @@ if (mask & PNG_FREE_ROWS)
 void /* PRIVATE */
 png_info_destroy(png_structp png_ptr, png_infop info_ptr)
 {
-   png_debug(1, "in png_info_destroy\n");
+   png_debug(1, "in png_info_destroy");
 
    png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
 
-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+#if defined(PNG_HANDLE_AS_UNKNOWN_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;
+      png_free(png_ptr, png_ptr->chunk_list);
+      png_ptr->chunk_list=NULL;
+      png_ptr->num_chunk_list = 0;
    }
 #endif
 
@@ -617,7 +625,8 @@ png_info_destroy(png_structp png_ptr, png_infop info_ptr)
 png_voidp PNGAPI
 png_get_io_ptr(png_structp png_ptr)
 {
-   if (png_ptr == NULL) return (NULL);
+   if (png_ptr == NULL)
+      return (NULL);
    return (png_ptr->io_ptr);
 }
 
@@ -632,8 +641,9 @@ png_get_io_ptr(png_structp png_ptr)
 void PNGAPI
 png_init_io(png_structp png_ptr, png_FILE_p fp)
 {
-   png_debug(1, "in png_init_io\n");
-   if (png_ptr == NULL) return;
+   png_debug(1, "in png_init_io");
+   if (png_ptr == NULL)
+      return;
    png_ptr->io_ptr = (png_voidp)fp;
 }
 #endif
@@ -649,7 +659,8 @@ png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
         {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
          "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
 
-   if (png_ptr == NULL) return (NULL);
+   if (png_ptr == NULL)
+      return (NULL);
    if (png_ptr->time_buffer == NULL)
    {
       png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29*
@@ -693,9 +704,9 @@ png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
 png_charp PNGAPI
 png_get_copyright(png_structp png_ptr)
 {
-   png_ptr = png_ptr;  /* silence compiler warning about unused png_ptr */
-   return ((png_charp) "\n libpng version 1.0.41 - October 31, 2008\n\
-   Copyright (c) 1998-2008 Glenn Randers-Pehrson\n\
+   png_ptr = png_ptr;  /* Silence compiler warning about unused png_ptr */
+   return ((png_charp) "\n libpng version 1.0.50 - September 10, 2009\n\
+   Copyright (c) 1998-2009 Glenn Randers-Pehrson\n\
    Copyright (c) 1996-1997 Andreas Dilger\n\
    Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.\n");
 }
@@ -712,7 +723,7 @@ png_charp PNGAPI
 png_get_libpng_ver(png_structp png_ptr)
 {
    /* Version of *.c files used when building libpng */
-   png_ptr = png_ptr;  /* silence compiler warning about unused png_ptr */
+   png_ptr = png_ptr;  /* Silence compiler warning about unused png_ptr */
    return ((png_charp) PNG_LIBPNG_VER_STRING);
 }
 
@@ -720,7 +731,7 @@ png_charp PNGAPI
 png_get_header_ver(png_structp png_ptr)
 {
    /* Version of *.h files used when building libpng */
-   png_ptr = png_ptr;  /* silence compiler warning about unused png_ptr */
+   png_ptr = png_ptr;  /* Silence compiler warning about unused png_ptr */
    return ((png_charp) PNG_LIBPNG_VER_STRING);
 }
 
@@ -728,7 +739,7 @@ png_charp PNGAPI
 png_get_header_version(png_structp png_ptr)
 {
    /* Returns longer string containing both version and date */
-   png_ptr = png_ptr;  /* silence compiler warning about unused png_ptr */
+   png_ptr = png_ptr;  /* Silence compiler warning about unused png_ptr */
    return ((png_charp) PNG_HEADER_VERSION_STRING
 #ifndef PNG_READ_SUPPORTED
    "     (NO READ SUPPORT)"
@@ -741,7 +752,7 @@ png_get_header_version(png_structp png_ptr)
 int PNGAPI
 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 */
+   /* Check chunk_name and return "keep" value if it's on the list, else 0 */
    int i;
    png_bytep p;
    if (png_ptr == NULL || chunk_name == NULL || png_ptr->num_chunk_list<=0)
@@ -758,7 +769,8 @@ png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name)
 int PNGAPI
 png_reset_zstream(png_structp png_ptr)
 {
-   if (png_ptr == NULL) return Z_STREAM_ERROR;
+   if (png_ptr == NULL)
+      return Z_STREAM_ERROR;
    return (inflateReset(&png_ptr->zstream));
 }
 #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
@@ -774,11 +786,11 @@ png_access_version_number(void)
 
 #if defined(PNG_READ_SUPPORTED) && defined(PNG_ASSEMBLER_CODE_SUPPORTED)
 #if !defined(PNG_1_0_X)
-/* this function was added to libpng 1.2.0 */
+/* This function was added to libpng 1.2.0 */
 int PNGAPI
 png_mmx_support(void)
 {
-   /* obsolete, to be removed from libpng-1.4.0 */
+   /* Obsolete, to be removed from libpng-1.4.0 */
     return -1;
 }
 #endif /* PNG_1_0_X */
@@ -791,9 +803,124 @@ png_mmx_support(void)
 png_size_t PNGAPI
 png_convert_size(size_t size)
 {
-  if (size > (png_size_t)-1)
-     PNG_ABORT();  /* We haven't got access to png_ptr, so no png_error() */
-  return ((png_size_t)size);
+   if (size > (png_size_t)-1)
+      PNG_ABORT();  /* We haven't got access to png_ptr, so no png_error() */
+   return ((png_size_t)size);
 }
 #endif /* PNG_SIZE_T */
+
+/* Added at libpng version 1.2.34 and 1.4.0 (moved from pngset.c) */
+#if defined(PNG_cHRM_SUPPORTED)
+#if !defined(PNG_NO_CHECK_cHRM)
+
+/*
+ *    Multiply two 32-bit numbers, V1 and V2, using 32-bit
+ *    arithmetic, to produce a 64 bit result in the HI/LO words.
+ *
+ *                  A B
+ *                x C D
+ *               ------
+ *              AD || BD
+ *        AC || CB || 0
+ *
+ *    where A and B are the high and low 16-bit words of V1,
+ *    C and D are the 16-bit words of V2, AD is the product of
+ *    A and D, and X || Y is (X << 16) + Y.
+*/
+
+void /* PRIVATE */
+png_64bit_product (long v1, long v2, unsigned long *hi_product,
+   unsigned long *lo_product)
+{
+   int a, b, c, d;
+   long lo, hi, x, y;
+
+   a = (v1 >> 16) & 0xffff;
+   b = v1 & 0xffff;
+   c = (v2 >> 16) & 0xffff;
+   d = v2 & 0xffff;
+
+   lo = b * d;                   /* BD */
+   x = a * d + c * b;            /* AD + CB */
+   y = ((lo >> 16) & 0xffff) + x;
+
+   lo = (lo & 0xffff) | ((y & 0xffff) << 16);
+   hi = (y >> 16) & 0xffff;
+
+   hi += a * c;                  /* AC */
+
+   *hi_product = (unsigned long)hi;
+   *lo_product = (unsigned long)lo;
+}
+
+int /* PRIVATE */
+png_check_cHRM_fixed(png_structp png_ptr,
+   png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
+   png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
+   png_fixed_point blue_x, png_fixed_point blue_y)
+{
+   int ret = 1;
+   unsigned long xy_hi,xy_lo,yx_hi,yx_lo;
+
+   png_debug(1, "in function png_check_cHRM_fixed");
+   if (png_ptr == NULL)
+      return 0;
+
+   if (white_x < 0 || white_y <= 0 ||
+         red_x < 0 ||   red_y <  0 ||
+       green_x < 0 || green_y <  0 ||
+        blue_x < 0 ||  blue_y <  0)
+   {
+      png_warning(png_ptr,
+        "Ignoring attempt to set negative chromaticity value");
+      ret = 0;
+   }
+   if (white_x > (png_fixed_point) PNG_UINT_31_MAX ||
+       white_y > (png_fixed_point) PNG_UINT_31_MAX ||
+         red_x > (png_fixed_point) PNG_UINT_31_MAX ||
+         red_y > (png_fixed_point) PNG_UINT_31_MAX ||
+       green_x > (png_fixed_point) PNG_UINT_31_MAX ||
+       green_y > (png_fixed_point) PNG_UINT_31_MAX ||
+        blue_x > (png_fixed_point) PNG_UINT_31_MAX ||
+        blue_y > (png_fixed_point) PNG_UINT_31_MAX )
+   {
+      png_warning(png_ptr,
+        "Ignoring attempt to set chromaticity value exceeding 21474.83");
+      ret = 0;
+   }
+   if (white_x > 100000L - white_y)
+   {
+      png_warning(png_ptr, "Invalid cHRM white point");
+      ret = 0;
+   }
+   if (red_x > 100000L - red_y)
+   {
+      png_warning(png_ptr, "Invalid cHRM red point");
+      ret = 0;
+   }
+   if (green_x > 100000L - green_y)
+   {
+      png_warning(png_ptr, "Invalid cHRM green point");
+      ret = 0;
+   }
+   if (blue_x > 100000L - blue_y)
+   {
+      png_warning(png_ptr, "Invalid cHRM blue point");
+      ret = 0;
+   }
+
+   png_64bit_product(green_x - red_x, blue_y - red_y, &xy_hi, &xy_lo);
+   png_64bit_product(green_y - red_y, blue_x - red_x, &yx_hi, &yx_lo);
+
+   if (xy_hi == yx_hi && xy_lo == yx_lo)
+   {
+      png_warning(png_ptr,
+         "Ignoring attempt to set cHRM RGB triangle with zero area");
+      ret = 0;
+   }
+
+   return ret;
+}
+#endif /* NO_PNG_CHECK_cHRM */
+#endif /* PNG_cHRM_SUPPORTED */
 #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */

png.h

@@ -1,14 +1,16 @@
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.0.41 - October 31, 2008
- * Copyright (c) 1998-2008 Glenn Randers-Pehrson
+ * libpng version 1.0.50 - September 10, 2009
+ * Copyright (c) 1998-2009 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 code is released under the libpng license (See LICENSE, below)
+ *
  * Authors and maintainers:
  *  libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
  *  libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
- *  libpng versions 0.97, January 1998, through 1.0.41 - October 31, 2008: Glenn
+ *  libpng versions 0.97, January 1998, through 1.0.50 - September 10, 2009: Glenn
  *  See also "Contributing Authors", below.
  *
  * Note about libpng version numbers:
@@ -212,6 +214,37 @@
  *    1.0.41rc01              10    10041  10.so.0.41[.0]
  *    1.2.33                  13    10233  12.so.0.33[.0]
  *    1.0.41                  10    10041  10.so.0.41[.0]
+ *    1.2.34beta01-07         13    10234  12.so.0.34[.0]
+ *    1.0.42rc01              10    10042  10.so.0.42[.0]
+ *    1.2.34rc01              13    10234  12.so.0.34[.0]
+ *    1.0.42                  10    10042  10.so.0.42[.0]
+ *    1.2.34                  13    10234  12.so.0.34[.0]
+ *    1.2.35beta01-03         13    10235  12.so.0.35[.0]
+ *    1.0.43rc01-02           10    10043  10.so.0.43[.0]
+ *    1.2.35rc01-02           13    10235  12.so.0.35[.0]
+ *    1.0.43                  10    10043  10.so.0.43[.0]
+ *    1.2.35                  13    10235  12.so.0.35[.0]
+ *    1.2.36beta01-05         13    10236  12.so.0.36[.0]
+ *    1.2.36rc01              13    10236  12.so.0.36[.0]
+ *    1.0.44                  10    10044  10.so.0.44[.0]
+ *    1.2.36                  13    10236  12.so.0.36[.0]
+ *    1.2.37beta01-03         13    10237  12.so.0.37[.0]
+ *    1.2.37rc01              13    10237  12.so.0.37[.0]
+ *    1.2.37                  13    10237  12.so.0.37[.0]
+ *    1.2.45                  10    10045  12.so.0.45[.0]
+ *    1.0.46                  10    10046  10.so.0.46[.0]
+ *    1.2.38beta01            13    10238  12.so.0.38[.0]
+ *    1.2.38rc01-03           13    10238  12.so.0.38[.0]
+ *    1.0.47                  10    10047  10.so.0.47[.0]
+ *    1.2.38                  13    10238  12.so.0.38[.0]
+ *    1.2.39beta01-05         13    10239  12.so.0.39[.0]
+ *    1.2.39rc01              13    10239  12.so.0.39[.0]
+ *    1.0.48                  10    10048  10.so.0.48[.0]
+ *    1.2.39                  13    10239  12.so.0.39[.0]
+ *    1.2.40beta01            13    10240  12.so.0.40[.0]
+ *    1.2.40rc01              13    10240  12.so.0.40[.0]
+ *    1.0.49                  10    10049  10.so.0.49[.0]
+ *    1.2.40                  13    10240  12.so.0.40[.0]
  *
  *    Henceforth the source version will match the shared-library major
  *    and minor numbers; the shared-library major version number will be
@@ -241,8 +274,10 @@
  * If you modify libpng you may insert additional notices immediately following
  * this sentence.
  *
- * libpng versions 1.2.6, August 15, 2004, through 1.0.41, October 31, 2008, are
- * Copyright (c) 2004, 2006-2008 Glenn Randers-Pehrson, and are
+ * This code is released under the libpng license.
+ *
+ * libpng versions 1.2.6, August 15, 2004, through 1.0.50, September 10, 2009, are
+ * Copyright (c) 2004, 2006-2009 Glenn Randers-Pehrson, and are
  * distributed according to the same disclaimer and license as libpng-1.2.5
  * with the following individual added to the list of Contributing Authors:
  *
@@ -353,13 +388,13 @@
  * Y2K compliance in libpng:
  * =========================
  *
- *    October 31, 2008
+ *    September 10, 2009
  *
  *    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 1.0.41 are Y2K compliant.  It is my belief that earlier
+ *    upward through 1.0.50 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
@@ -415,9 +450,9 @@
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.0.41"
+#define PNG_LIBPNG_VER_STRING "1.0.50"
 #define PNG_HEADER_VERSION_STRING \
-   " libpng version 1.0.41 - October 31, 2008\n"
+   " libpng version 1.0.50 - September 10, 2009\n"
 
 #define PNG_LIBPNG_VER_SONUM   0
 #define PNG_LIBPNG_VER_DLLNUM  10
@@ -425,9 +460,10 @@
 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
 #define PNG_LIBPNG_VER_MAJOR   1
 #define PNG_LIBPNG_VER_MINOR   0
-#define PNG_LIBPNG_VER_RELEASE 41
+#define PNG_LIBPNG_VER_RELEASE 50
 /* This should match the numeric part of the final component of
- * PNG_LIBPNG_VER_STRING, omitting any leading zero: */
+ * PNG_LIBPNG_VER_STRING, omitting any leading zero:
+ */
 
 #define PNG_LIBPNG_VER_BUILD  0
 
@@ -437,7 +473,7 @@
 #define PNG_LIBPNG_BUILD_RC       3
 #define PNG_LIBPNG_BUILD_STABLE   4
 #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
-  
+
 /* Release-Specific Flags */
 #define PNG_LIBPNG_BUILD_PATCH    8 /* Can be OR'ed with
                                        PNG_LIBPNG_BUILD_STABLE only */
@@ -452,15 +488,16 @@
  * We must not include leading zeros.
  * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
  * version 1.0.0 was mis-numbered 100 instead of 10000).  From
- * version 1.0.1 it's    xxyyzz, where x=major, y=minor, z=release */
-#define PNG_LIBPNG_VER 10041 /* 1.0.41 */
+ * version 1.0.1 it's    xxyyzz, where x=major, y=minor, z=release
+ */
+#define PNG_LIBPNG_VER 10050 /* 1.0.50 */
 
 #ifndef PNG_VERSION_INFO_ONLY
-/* include the compression library's header */
+/* Include the compression library's header */
 #include "zlib.h"
 #endif
 
-/* include all user configurable info, including optional assembler routines */
+/* Include all user configurable info, including optional assembler routines */
 #include "pngconf.h"
 
 /*
@@ -468,12 +505,12 @@
 /* Ref MSDN: Private as priority over Special
  * VS_FF_PRIVATEBUILD File *was not* built using standard release
  * procedures. If this value is given, the StringFileInfo block must
- * contain a PrivateBuild string. 
+ * contain a PrivateBuild string.
  *
  * VS_FF_SPECIALBUILD File *was* built by the original company using
  * standard release procedures but is a variation of the standard
  * file of the same version number. If this value is given, the
- * StringFileInfo block must contain a SpecialBuild string. 
+ * StringFileInfo block must contain a SpecialBuild string.
  */
 
 #if defined(PNG_USER_PRIVATEBUILD)
@@ -535,14 +572,14 @@ extern "C" {
 #define png_write_status_ptr_NULL NULL
 #endif
 
-/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
+/* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */
 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
 /* Version information for C files, stored in png.c.  This had better match
  * the version above.
  */
 #ifdef PNG_USE_GLOBAL_ARRAYS
 PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18];
-  /* need room for 99.99.99beta99z */
+  /* Need room for 99.99.99beta99z */
 #else
 #define png_libpng_ver png_get_header_ver(NULL)
 #endif
@@ -661,7 +698,8 @@ typedef png_text FAR * FAR * png_textpp;
 #endif
 
 /* Supported compression types for text in PNG files (tEXt, and zTXt).
- * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
+ * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed.
+ */
 #define PNG_TEXT_COMPRESSION_NONE_WR -3
 #define PNG_TEXT_COMPRESSION_zTXt_WR -2
 #define PNG_TEXT_COMPRESSION_NONE    -1
@@ -688,7 +726,8 @@ typedef struct png_time_struct
 typedef png_time FAR * png_timep;
 typedef png_time FAR * FAR * png_timepp;
 
-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \
+ defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
 /* png_unknown_chunk is a structure to hold queued chunks for which there is
  * no specific support.  The idea is that we can use this to queue
  * up private chunks for output even though the library doesn't actually
@@ -750,7 +789,7 @@ typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
  */
 typedef struct png_info_struct
 {
-   /* the following are necessary for every PNG file */
+   /* The following are necessary for every PNG file */
    png_uint_32 width;       /* width of image in pixels (from IHDR) */
    png_uint_32 height;      /* height of image in pixels (from IHDR) */
    png_uint_32 valid;       /* valid chunk data (see PNG_INFO_ below) */
@@ -923,8 +962,9 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
    png_uint_32 free_me;     /* flags items libpng is responsible for freeing */
 #endif
 
-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
-   /* storage for unknown chunks that the library doesn't recognize. */
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \
+ defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
+   /* Storage for unknown chunks that the library doesn't recognize. */
    png_unknown_chunkp unknown_chunks;
    png_size_t unknown_chunks_num;
 #endif
@@ -939,7 +979,7 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
 #endif
 
 #if defined(PNG_sPLT_SUPPORTED)
-   /* data on sPLT chunks (there may be more than one). */
+   /* Data on sPLT chunks (there may be more than one). */
    png_sPLT_tp splt_palettes;
    png_uint_32 splt_palettes_num;
 #endif
@@ -1154,7 +1194,10 @@ typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
 #define PNG_TRANSFORM_SWAP_ALPHA     0x0100    /* read and write */
 #define PNG_TRANSFORM_SWAP_ENDIAN    0x0200    /* read and write */
 #define PNG_TRANSFORM_INVERT_ALPHA   0x0400    /* read and write */
-#define PNG_TRANSFORM_STRIP_FILLER   0x0800    /* WRITE only */
+#define PNG_TRANSFORM_STRIP_FILLER   0x0800    /* write only, deprecated */
+/* Added to libpng-1.2.34 */
+#define PNG_TRANSFORM_STRIP_FILLER_BEFORE 0x0800  /* write only */
+#define PNG_TRANSFORM_STRIP_FILLER_AFTER  0x1000  /* write only */
 
 /* Flags for MNG supported features */
 #define PNG_FLAG_MNG_EMPTY_PLTE     0x01
@@ -1271,7 +1314,7 @@ struct png_struct_def
 #endif /* PNG_bKGD_SUPPORTED */
 
 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
-   png_flush_ptr output_flush_fn;/* Function for flushing output */
+   png_flush_ptr output_flush_fn; /* Function for flushing output */
    png_uint_32 flush_dist;    /* how many rows apart to flush, 0 - no flush */
    png_uint_32 flush_rows;    /* number of rows written since last flush */
 #endif
@@ -1369,7 +1412,7 @@ struct png_struct_def
 /* New members added in libpng-1.0.6 */
 
 #ifdef PNG_FREE_ME_SUPPORTED
-   png_uint_32 free_me;       /* flags items libpng is responsible for freeing */
+   png_uint_32 free_me;   /* flags items libpng is responsible for freeing */
 #endif
 
 #if defined(PNG_USER_CHUNKS_SUPPORTED)
@@ -1377,7 +1420,7 @@ struct png_struct_def
    png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
 #endif
 
-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
    int num_chunk_list;
    png_bytep chunk_list;
 #endif
@@ -1395,7 +1438,7 @@ struct png_struct_def
 #if defined(PNG_MNG_FEATURES_SUPPORTED) || \
     defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
     defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
-/* changed from png_byte to png_uint_32 at version 1.2.0 */
+/* Changed from png_byte to png_uint_32 at version 1.2.0 */
 #ifdef PNG_1_0_X
    png_byte mng_features_permitted;
 #else
@@ -1431,21 +1474,21 @@ struct png_struct_def
 
 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
 #ifdef PNG_USER_MEM_SUPPORTED
-   png_voidp mem_ptr;                /* user supplied struct for mem functions */
-   png_malloc_ptr malloc_fn;         /* function for allocating memory */
-   png_free_ptr free_fn;             /* function for freeing memory */
+   png_voidp mem_ptr;            /* user supplied struct for mem functions */
+   png_malloc_ptr malloc_fn;     /* function for allocating memory */
+   png_free_ptr free_fn;         /* function for freeing memory */
 #endif
 
 /* New member added in libpng-1.0.13 and 1.2.0 */
-   png_bytep big_row_buf;         /* buffer to save current (unfiltered) row */
+   png_bytep big_row_buf;        /* buffer to save current (unfiltered) row */
 
 #if defined(PNG_READ_DITHER_SUPPORTED)
 /* The following three members were added at version 1.0.14 and 1.2.4 */
-   png_bytep dither_sort;            /* working sort array */
-   png_bytep index_to_palette;       /* where the original index currently is */
-                                     /* in the palette */
-   png_bytep palette_to_index;       /* which original index points to this */
-                                     /* palette color */
+   png_bytep dither_sort;        /* working sort array */
+   png_bytep index_to_palette;   /* where the original index currently is */
+                                 /* in the palette */
+   png_bytep palette_to_index;   /* which original index points to this */
+                                 /* palette color */
 #endif
 
 /* New members added in libpng-1.0.16 and 1.2.6 */
@@ -1458,7 +1501,7 @@ struct png_struct_def
 
 /* New member added in libpng-1.0.25 and 1.2.17 */
 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
-   /* storage for unknown chunk that the library doesn't recognize. */
+   /* Storage for unknown chunk that the library doesn't recognize. */
    png_unknown_chunk unknown_chunk;
 #endif
 
@@ -1474,7 +1517,7 @@ struct png_struct_def
 /* This triggers a compiler error in png.c, if png.c and png.h
  * do not agree upon the version number.
  */
-typedef png_structp version_1_0_41;
+typedef png_structp version_1_0_50;
 
 typedef png_struct FAR * FAR * png_structpp;
 
@@ -1578,7 +1621,7 @@ extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,
    png_infop info_ptr));
 
 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
-/* read the information before the actual image data. */
+/* Read the information before the actual image data. */
 extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,
    png_infop info_ptr));
 #endif
@@ -1591,11 +1634,11 @@ extern PNG_EXPORT(png_charp,png_convert_to_rfc1123)
 #if !defined(_WIN32_WCE)
 /* "time.h" functions are not supported on WindowsCE */
 #if defined(PNG_WRITE_tIME_SUPPORTED)
-/* convert from a struct tm to png_time */
+/* Convert from a struct tm to png_time */
 extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,
    struct tm FAR * ttime));
 
-/* convert from time_t to png_time.  Uses gmtime() */
+/* Convert from time_t to png_time.  Uses gmtime() */
 extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,
    time_t ttime));
 #endif /* PNG_WRITE_tIME_SUPPORTED */
@@ -1715,7 +1758,7 @@ extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr,
 #endif
 
 #if defined(PNG_READ_16_TO_8_SUPPORTED)
-/* strip the second byte of information from a 16-bit depth file. */
+/* Strip the second byte of information from a 16-bit depth file. */
 extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr));
 #endif
 
@@ -1751,74 +1794,74 @@ extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows));
 extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr));
 #endif
 
-/* optional update palette with requested transformations */
+/* Optional update palette with requested transformations */
 extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr));
 
-/* optional call to update the users info structure */
+/* Optional call to update the users info structure */
 extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr,
    png_infop info_ptr));
 
 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
-/* read one or more rows of image data. */
+/* Read one or more rows of image data. */
 extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,
    png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));
 #endif
 
 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
-/* read a row of data. */
+/* Read a row of data. */
 extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,
    png_bytep row,
    png_bytep display_row));
 #endif
 
 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
-/* read the whole image into memory at once. */
+/* Read the whole image into memory at once. */
 extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr,
    png_bytepp image));
 #endif
 
-/* write a row of image data */
+/* Write a row of image data */
 extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,
    png_bytep row));
 
-/* write a few rows of image data */
+/* Write a few rows of image data */
 extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr,
    png_bytepp row, png_uint_32 num_rows));
 
-/* write the image data */
+/* Write the image data */
 extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,
    png_bytepp image));
 
-/* writes the end of the PNG file. */
+/* Writes the end of the PNG file. */
 extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,
    png_infop info_ptr));
 
 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
-/* read the end of the PNG file. */
+/* Read the end of the PNG file. */
 extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr,
    png_infop info_ptr));
 #endif
 
-/* free any memory associated with the png_info_struct */
+/* Free any memory associated with the png_info_struct */
 extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr,
    png_infopp info_ptr_ptr));
 
-/* free any memory associated with the png_struct and the png_info_structs */
+/* Free any memory associated with the png_struct and the png_info_structs */
 extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp
    png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
 
-/* free all memory used by the read (old method - NOT DLL EXPORTED) */
+/* Free all memory used by the read (old method - NOT DLL EXPORTED) */
 extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
    png_infop end_info_ptr));
 
-/* free any memory associated with the png_struct and the png_info_structs */
+/* Free any memory associated with the png_struct and the png_info_structs */
 extern PNG_EXPORT(void,png_destroy_write_struct)
    PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
 
-/* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
+/* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
 extern void png_write_destroy PNGARG((png_structp png_ptr));
 
-/* set the libpng method of handling chunk CRC errors */
+/* Set the libpng method of handling chunk CRC errors */
 extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,
    int crit_action, int ancil_action));
 
@@ -1846,7 +1889,7 @@ extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,
  * header file (zlib.h) for an explination of the compression functions.
  */
 
-/* set the filtering method(s) used by libpng.  Currently, the only valid
+/* Set the filtering method(s) used by libpng.  Currently, the only valid
  * value for "method" is 0.
  */
 extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,
@@ -1974,6 +2017,11 @@ extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr));
  * If buffered output is not used, then output_flush_fn can be set to NULL.
  * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
  * output_flush_fn will be ignored (and thus can be NULL).
+ * It is probably a mistake to use NULL for output_flush_fn if
+ * write_data_fn is not also NULL unless you have built libpng with
+ * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's
+ * default flush function, which uses the standard *FILE structure, will
+ * be used.
  */
 extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr,
    png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
@@ -2038,15 +2086,15 @@ extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr,
    png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
    png_progressive_end_ptr end_fn));
 
-/* returns the user pointer associated with the push read functions */
+/* Returns the user pointer associated with the push read functions */
 extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)
    PNGARG((png_structp png_ptr));
 
-/* function to be called when data becomes available */
+/* Function to be called when data becomes available */
 extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,
    png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));
 
-/* function that combines rows.  Not very much different than the
+/* Function that combines rows.  Not very much different than the
  * png_combine_row() call.  Is this even used?????
  */
 extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
@@ -2064,7 +2112,7 @@ extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr,
    png_uint_32 size));
 #endif
 
-/* frees a pointer allocated by png_malloc() */
+/* Frees a pointer allocated by png_malloc() */
 extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
 
 #if defined(PNG_1_0_X)
@@ -2081,11 +2129,12 @@ extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr,
    png_infop info_ptr, png_uint_32 free_me, int num));
 #ifdef PNG_FREE_ME_SUPPORTED
 /* Reassign responsibility for freeing existing data, whether allocated
- * by libpng or by the application */
+ * by libpng or by the application
+ */
 extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,
    png_infop info_ptr, int freer, png_uint_32 mask));
 #endif
-/* assignments for png_data_freer */
+/* Assignments for png_data_freer */
 #define PNG_DESTROY_WILL_FREE_DATA 1
 #define PNG_SET_WILL_FREE_DATA 1
 #define PNG_USER_WILL_FREE_DATA 2
@@ -2169,11 +2218,13 @@ png_infop info_ptr));
 
 #if defined(PNG_INFO_IMAGE_SUPPORTED)
 /* Returns row_pointers, which is an array of pointers to scanlines that was
-returned from png_read_png(). */
+ * returned from png_read_png().
+ */
 extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr,
 png_infop info_ptr));
 /* Set row_pointers, which is an array of pointers to scanlines for use
-by png_write_png(). */
+ * by png_write_png().
+ */
 extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr,
    png_infop info_ptr, png_bytepp row_pointers));
 #endif
@@ -2474,8 +2525,8 @@ extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
 #endif
 #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
 
-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
-/* provide a list of chunks and how they are to be handled, if the built-in
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+/* Provide a list of chunks and how they are to be handled, if the built-in
    handling or default unknown chunk handling is not desired.  Any chunks not
    listed will be handled in the default manner.  The IHDR and IEND chunks
    must not be listed.
@@ -2486,6 +2537,10 @@ extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
 */
 extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp
    png_ptr, int keep, png_bytep chunk_list, int num_chunks));
+PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
+   chunk_name));
+#endif
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
 extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,
    png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));
 extern PNG_EXPORT(void, png_set_unknown_chunk_location)
@@ -2493,14 +2548,11 @@ extern PNG_EXPORT(void, png_set_unknown_chunk_location)
 extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
    png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
 #endif
-#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
-   chunk_name));
-#endif
 
 /* Png_free_data() will turn off the "valid" flag for anything it frees.
-   If you need to turn it off for a chunk that your application has freed,
-   you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */
+ * If you need to turn it off for a chunk that your application has freed,
+ * you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK);
+ */
 extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,
    png_infop info_ptr, int mask));
 
@@ -2526,34 +2578,90 @@ extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
 #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
 #include <crtdbg.h>
 #if (PNG_DEBUG > 1)
-#define png_debug(l,m)  _RPT0(_CRT_WARN,m)
-#define png_debug1(l,m,p1)  _RPT1(_CRT_WARN,m,p1)
-#define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m,p1,p2)
+#ifndef _DEBUG
+#  define _DEBUG
+#endif
+#ifndef png_debug
+#define png_debug(l,m)  _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE)
+#endif
+#ifndef png_debug1
+#define png_debug1(l,m,p1)  _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1)
+#endif
+#ifndef png_debug2
+#define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2)
+#endif
 #endif
 #else /* PNG_DEBUG_FILE || !_MSC_VER */
 #ifndef PNG_DEBUG_FILE
 #define PNG_DEBUG_FILE stderr
 #endif /* PNG_DEBUG_FILE */
+
 #if (PNG_DEBUG > 1)
-#define png_debug(l,m) \
-{ \
-     int num_tabs=l; \
-     fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
-       (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
-}
-#define png_debug1(l,m,p1) \
-{ \
-     int num_tabs=l; \
-     fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
-       (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
-}
-#define png_debug2(l,m,p1,p2) \
-{ \
-     int num_tabs=l; \
-     fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
-       (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
-}
+/* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on non-ISO
+ * compilers.
+ */
+#  ifdef __STDC__
+#    ifndef png_debug
+#      define png_debug(l,m) \
+       { \
+       int num_tabs=l; \
+       fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
+         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
+       }
+#    endif
+#    ifndef png_debug1
+#      define png_debug1(l,m,p1) \
+       { \
+       int num_tabs=l; \
+       fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
+         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
+       }
+#    endif
+#    ifndef png_debug2
+#      define png_debug2(l,m,p1,p2) \
+       { \
+       int num_tabs=l; \
+       fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
+         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
+       }
+#    endif
+#  else /* __STDC __ */
+#    ifndef png_debug
+#      define png_debug(l,m) \
+       { \
+       int num_tabs=l; \
+       char format[256]; \
+       snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
+         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
+         m,PNG_STRING_NEWLINE); \
+       fprintf(PNG_DEBUG_FILE,format); \
+       }
+#    endif
+#    ifndef png_debug1
+#      define png_debug1(l,m,p1) \
+       { \
+       int num_tabs=l; \
+       char format[256]; \
+       snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
+         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
+         m,PNG_STRING_NEWLINE); \
+       fprintf(PNG_DEBUG_FILE,format,p1); \
+       }
+#    endif
+#    ifndef png_debug2
+#      define png_debug2(l,m,p1,p2) \
+       { \
+       int num_tabs=l; \
+       char format[256]; \
+       snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
+         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
+         m,PNG_STRING_NEWLINE); \
+       fprintf(PNG_DEBUG_FILE,format,p1,p2); \
+       }
+#    endif
+#  endif /* __STDC __ */
 #endif /* (PNG_DEBUG > 1) */
+
 #endif /* _MSC_VER */
 #endif /* (PNG_DEBUG > 0) */
 #endif /* PNG_DEBUG */
@@ -2648,17 +2756,17 @@ extern PNG_EXPORT(void,png_set_mmx_thresholds)
 #if !defined(PNG_1_0_X)
 /* png.c, pnggccrd.c, or pngvcrd.c */
 extern PNG_EXPORT(int,png_mmx_support) PNGARG((void));
+#endif /* PNG_1_0_X */
 #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
 
 /* Strip the prepended error numbers ("#nnn ") from error and warning
- * messages before passing them to the error or warning handler. */
+ * messages before passing them to the error or warning handler.
+ */
 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
 extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp
    png_ptr, png_uint_32 strip_mode));
 #endif
 
-#endif /* PNG_1_0_X */
-
 /* Added at libpng-1.2.6 */
 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
 extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp
@@ -2670,7 +2778,9 @@ extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
 #endif
 
 
-/* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */
+/* Maintainer: Put new public prototypes here ^, in libpng.3, and in
+ * project defs
+ */
 
 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
 /* With these routines we avoid an integer divide, which will be slower on
@@ -2699,7 +2809,7 @@ extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
                         (png_uint_32)(alpha)) + (png_uint_32)32768L);        \
        (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
 
-#else  /* standard method using integer division */
+#else  /* Standard method using integer division */
 
 #  define png_composite(composite, fg, alpha, bg)                            \
      (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) +    \
@@ -2782,7 +2892,7 @@ extern PNG_EXPORT(void,png_save_uint_16)
 #define PNG_HAVE_PNG_SIGNATURE    0x1000
 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
 
-/* flags for the transformations the PNG library does on the image data */
+/* Flags for the transformations the PNG library does on the image data */
 #define PNG_BGR                0x0001
 #define PNG_INTERLACE          0x0002
 #define PNG_PACK               0x0004
@@ -2816,7 +2926,7 @@ extern PNG_EXPORT(void,png_save_uint_16)
                        /*  0x20000000L  unused */
                        /*  0x40000000L  unused */
 
-/* flags for png_create_struct */
+/* Flags for png_create_struct */
 #define PNG_STRUCT_PNG   0x0001
 #define PNG_STRUCT_INFO  0x0002
 
@@ -2826,7 +2936,7 @@ extern PNG_EXPORT(void,png_save_uint_16)
 #define PNG_COST_SHIFT 3
 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
 
-/* flags for the png_ptr->flags rather than declaring a byte for each one */
+/* Flags for the png_ptr->flags rather than declaring a byte for each one */
 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY     0x0001
 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL        0x0002
 #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL    0x0004
@@ -2868,7 +2978,7 @@ extern PNG_EXPORT(void,png_save_uint_16)
 #define PNG_FLAG_CRC_MASK           (PNG_FLAG_CRC_ANCILLARY_MASK | \
                                      PNG_FLAG_CRC_CRITICAL_MASK)
 
-/* save typing and make code easier to understand */
+/* Save typing and make code easier to understand */
 
 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
    abs((int)((c1).green) - (int)((c2).green)) + \
@@ -2881,15 +2991,16 @@ extern PNG_EXPORT(void,png_save_uint_16)
     (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) )
 
 /* PNG_OUT_OF_RANGE returns true if value is outside the range
-   ideal-delta..ideal+delta.  Each argument is evaluated twice.
-   "ideal" and "delta" should be constants, normally simple
-   integers, "value" a variable. Added to libpng-1.2.6 JB */
+ * ideal-delta..ideal+delta.  Each argument is evaluated twice.
+ * "ideal" and "delta" should be constants, normally simple
+ * integers, "value" a variable. Added to libpng-1.2.6 JB
+ */
 #define PNG_OUT_OF_RANGE(value, ideal, delta) \
         ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
 
-/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
+/* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */
 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
-/* place to hold the signature string for a PNG file. */
+/* Place to hold the signature string for a PNG file. */
 #ifdef PNG_USE_GLOBAL_ARRAYS
    PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8];
 #else
@@ -3008,7 +3119,8 @@ PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
 #endif
 
 /* Next four functions are used internally as callbacks.  PNGAPI is required
- * but not PNG_EXPORT.  PNGAPI added at libpng version 1.2.3. */
+ * but not PNG_EXPORT.  PNGAPI added at libpng version 1.2.3.
+ */
 
 PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
    png_bytep data, png_size_t length));
@@ -3073,10 +3185,10 @@ PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
 PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
 #endif
 
-/* simple function to write the signature */
+/* Simple function to write the signature */
 PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr));
 
-/* write various chunks */
+/* Write various chunks */
 
 /* Write the IHDR chunk, and update the png_struct with the necessary
  * information.
@@ -3228,12 +3340,12 @@ PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));
 PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr));
 #endif
 
-/* combine a row of data, dealing with alpha, etc. if requested */
+/* Combine a row of data, dealing with alpha, etc. if requested */
 PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
    int mask));
 
 #if defined(PNG_READ_INTERLACING_SUPPORTED)
-/* expand an interlaced row */
+/* Expand an interlaced row */
 /* OLD pre-1.0.9 interface:
 PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
    png_bytep row, int pass, png_uint_32 transformations));
@@ -3244,12 +3356,12 @@ PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));
 /* GRR TO DO (2.0 or whenever):  simplify other internal calling interfaces */
 
 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
-/* grab pixels out of a row for an interlaced pass */
+/* Grab pixels out of a row for an interlaced pass */
 PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
    png_bytep row, int pass));
 #endif
 
-/* unfilter a row */
+/* Unfilter a row */
 PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
    png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));
 
@@ -3260,16 +3372,16 @@ PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
 /* Write out the filtered row. */
 PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
    png_bytep filtered_row));
-/* finish a row while reading, dealing with interlacing passes, etc. */
+/* Finish a row while reading, dealing with interlacing passes, etc. */
 PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
 
-/* initialize the row buffers, etc. */
+/* Initialize the row buffers, etc. */
 PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
-/* optional call to update the users info structure */
+/* Optional call to update the users info structure */
 PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
    png_infop info_ptr));
 
-/* these are the functions that do the transformations */
+/* These are the functions that do the transformations */
 #if defined(PNG_READ_FILLER_SUPPORTED)
 PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
    png_bytep row, png_uint_32 filler, png_uint_32 flags));
@@ -3391,7 +3503,7 @@ PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
  * then calls the appropriate callback for the chunk if it is valid.
  */
 
-/* decode the IHDR chunk */
+/* Decode the IHDR chunk */
 PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
    png_uint_32 length));
 PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
@@ -3490,7 +3602,7 @@ PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
 PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
    png_bytep chunk_name));
 
-/* handle the transformations for reading and writing */
+/* Handle the transformations for reading and writing */
 PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
 PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));
 
@@ -3584,6 +3696,23 @@ png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
 /* Read the chunk header (length + type name) */
 PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr));
 
+/* Added at libpng version 1.2.34 */
+#if defined(PNG_cHRM_SUPPORTED)
+PNG_EXTERN int png_check_cHRM_fixed  PNGARG((png_structp png_ptr,
+   png_fixed_point int_white_x, png_fixed_point int_white_y,
+   png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
+   int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
+   png_fixed_point int_blue_y));
+#endif
+
+#if defined(PNG_cHRM_SUPPORTED)
+#if !defined(PNG_NO_CHECK_cHRM)
+/* Added at libpng version 1.2.34 */
+PNG_EXTERN void png_64bit_product (long v1, long v2, unsigned long *hi_product,
+   unsigned long *lo_product);
+#endif
+#endif
+
 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
 
 #endif /* PNG_INTERNAL */
@@ -3593,5 +3722,5 @@ PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr));
 #endif
 
 #endif /* PNG_VERSION_INFO_ONLY */
-/* do not put anything past this line */
+/* Do not put anything past this line */
 #endif /* PNG_H */

pngconf.h

@@ -1,11 +1,14 @@
 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng version 1.0.41 - October 31, 2008
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2008 Glenn Randers-Pehrson
+ * libpng version 1.0.50 - September 10, 2009
+ * Copyright (c) 1998-2009 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 code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
  */
 
 /* Any machine specific code is near the front of this file, so if you
@@ -19,7 +22,7 @@
 
 #define PNG_1_0_X
 
-/* 
+/*
  * PNG_USER_CONFIG has to be defined on the compiler command line. This
  * includes the resource compiler for Windows DLL configurations.
  */
@@ -33,7 +36,7 @@
 
 /*
  * Added at libpng-1.2.8
- *  
+ *
  * If you create a private DLL you need to define in "pngusr.h" the followings:
  * #define PNG_USER_PRIVATEBUILD <Describes by whom and why this version of
  *        the DLL was built>
@@ -44,8 +47,8 @@
  *        number and must match your private DLL name>
  *  e.g. // private DLL "libpng13gx.dll"
  *       #define PNG_USER_DLLFNAME_POSTFIX "gx"
- * 
- * The following macros are also at your disposal if you want to complete the 
+ *
+ * The following macros are also at your disposal if you want to complete the
  * DLL VERSIONINFO structure.
  * - PNG_USER_VERSIONINFO_COMMENTS
  * - PNG_USER_VERSIONINFO_COMPANYNAME
@@ -141,9 +144,9 @@
  * 'Cygwin' defines/defaults:
  *   PNG_BUILD_DLL -- (ignored) building the dll
  *   (no define)   -- (ignored) building an application, linking to the dll
- *   PNG_STATIC    -- (ignored) building the static lib, or building an 
+ *   PNG_STATIC    -- (ignored) building the static lib, or building an
  *                    application that links to the static lib.
- *   ALL_STATIC    -- (ignored) building various static libs, or building an 
+ *   ALL_STATIC    -- (ignored) building various static libs, or building an
  *                    application that links to the static libs.
  * Thus,
  * a cygwin user should define either PNG_BUILD_DLL or PNG_STATIC, and
@@ -156,12 +159,12 @@
  *   PNG_BUILD_DLL
  *   PNG_STATIC
  *   (nothing) == PNG_USE_DLL
- * 
+ *
  * CYGWIN (2002-01-20): The preceding is now obsolete. With the advent
- *   of auto-import in binutils, we no longer need to worry about 
+ *   of auto-import in binutils, we no longer need to worry about
  *   __declspec(dllexport) / __declspec(dllimport) and friends.  Therefore,
  *   we don't need to worry about PNG_STATIC or ALL_STATIC when it comes
- *   to __declspec() stuff.  However, we DO need to worry about 
+ *   to __declspec() stuff.  However, we DO need to worry about
  *   PNG_BUILD_DLL and PNG_STATIC because those change some defaults
  *   such as CONSOLE_IO and whether GLOBAL_ARRAYS are allowed.
  */
@@ -205,8 +208,8 @@
 #        if !defined(PNG_DLL)
 #          define PNG_DLL
 #        endif
-#      endif  
-#    endif  
+#      endif
+#    endif
 #  endif
 #endif
 
@@ -227,6 +230,8 @@
 #  include <windows.h>
    /* Console I/O functions are not supported on WindowsCE */
 #  define PNG_NO_CONSOLE_IO
+   /* abort() may not be supported on some/all Windows CE platforms */
+#  define PNG_ABORT() exit(-1)
 #  ifdef PNG_DEBUG
 #    undef PNG_DEBUG
 #  endif
@@ -306,21 +311,29 @@
 #ifdef PNG_SETJMP_SUPPORTED
 /* This is an attempt to force a single setjmp behaviour on Linux.  If
  * the X config stuff didn't define _BSD_SOURCE we wouldn't need this.
+ *
+ * You can bypass this test if you know that your application uses exactly
+ * the same setjmp.h that was included when libpng was built.  Only define
+ * PNG_SKIP_SETJMP_CHECK while building your application, prior to the
+ * application's '#include "png.h"'. Don't define PNG_SKIP_SETJMP_CHECK
+ * while building a separate libpng library for general use.
  */
 
-#  ifdef __linux__
-#    ifdef _BSD_SOURCE
-#      define PNG_SAVE_BSD_SOURCE
-#      undef _BSD_SOURCE
-#    endif
-#    ifdef _SETJMP_H
-     /* If you encounter a compiler error here, see the explanation
-      * near the end of INSTALL.
-      */
-         __pngconf.h__ already includes setjmp.h;
-         __dont__ include it again.;
-#    endif
-#  endif /* __linux__ */
+#  ifndef PNG_SKIP_SETJMP_CHECK
+#    ifdef __linux__
+#      ifdef _BSD_SOURCE
+#        define PNG_SAVE_BSD_SOURCE
+#        undef _BSD_SOURCE
+#      endif
+#      ifdef _SETJMP_H
+       /* If you encounter a compiler error here, see the explanation
+        * near the end of INSTALL.
+        */
+           __pngconf.h__ in libpng already includes setjmp.h;
+           __dont__ include it again.;
+#      endif
+#    endif /* __linux__ */
+#  endif /* PNG_SKIP_SETJMP_CHECK */
 
    /* include setjmp.h for error handling */
 #  include <setjmp.h>
@@ -471,7 +484,7 @@
  * iTXt support was added.  iTXt support was turned off by default through
  * libpng-1.2.x, to support old apps that malloc the png_text structure
  * instead of calling png_set_text() and letting libpng malloc it.  It
- * was turned on by default in libpng-1.3.0.
+ * will be turned on by default in libpng-1.4.0.
  */
 
 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
@@ -505,6 +518,7 @@
 #  define PNG_NO_FREE_ME
 #  define PNG_NO_READ_UNKNOWN_CHUNKS
 #  define PNG_NO_WRITE_UNKNOWN_CHUNKS
+#  define PNG_NO_HANDLE_AS_UNKNOWN
 #  define PNG_NO_READ_USER_CHUNKS
 #  define PNG_NO_READ_iCCP
 #  define PNG_NO_WRITE_iCCP
@@ -534,7 +548,7 @@
 #  define PNG_FREE_ME_SUPPORTED
 #endif
 
-#if defined(PNG_READ_SUPPORTED)
+#ifdef PNG_READ_SUPPORTED
 
 #if !defined(PNG_READ_TRANSFORMS_NOT_SUPPORTED) && \
       !defined(PNG_NO_READ_TRANSFORMS)
@@ -622,7 +636,7 @@
 
 #endif /* PNG_READ_SUPPORTED */
 
-#if defined(PNG_WRITE_SUPPORTED)
+#ifdef PNG_WRITE_SUPPORTED
 
 # if !defined(PNG_WRITE_TRANSFORMS_NOT_SUPPORTED) && \
     !defined(PNG_NO_WRITE_TRANSFORMS)
@@ -725,7 +739,7 @@
 #  define PNG_EASY_ACCESS_SUPPORTED
 #endif
 
-/* PNG_ASSEMBLER_CODE was enabled by default in version 1.2.0 
+/* PNG_ASSEMBLER_CODE was enabled by default in version 1.2.0
  * and removed from version 1.2.20.  The following will be removed
  * from libpng-1.4.0
 */
@@ -792,6 +806,7 @@
 #  define PNG_USER_HEIGHT_MAX 1000000L
 #endif
 
+
 /* These are currently experimental features, define them if you want */
 
 /* very little testing */
@@ -919,14 +934,22 @@
 #  define PNG_READ_zTXt_SUPPORTED
 #  define PNG_zTXt_SUPPORTED
 #endif
+#ifndef PNG_NO_READ_OPT_PLTE
+#  define PNG_READ_OPT_PLTE_SUPPORTED /* only affects support of the */
+#endif                      /* optional PLTE chunk in RGB and RGBA images */
+#if defined(PNG_READ_iTXt_SUPPORTED) || defined(PNG_READ_tEXt_SUPPORTED) || \
+    defined(PNG_READ_zTXt_SUPPORTED)
+#  define PNG_READ_TEXT_SUPPORTED
+#  define PNG_TEXT_SUPPORTED
+#endif
+
+#endif /* PNG_READ_ANCILLARY_CHUNKS_SUPPORTED */
+
 #ifndef PNG_NO_READ_UNKNOWN_CHUNKS
 #  define PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
 #  ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
 #    define PNG_UNKNOWN_CHUNKS_SUPPORTED
 #  endif
-#  ifndef PNG_NO_HANDLE_AS_UNKNOWN
-#    define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-#  endif
 #endif
 #if !defined(PNG_NO_READ_USER_CHUNKS) && \
      defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
@@ -939,17 +962,14 @@
 #    undef PNG_NO_HANDLE_AS_UNKNOWN
 #  endif
 #endif
-#ifndef PNG_NO_READ_OPT_PLTE
-#  define PNG_READ_OPT_PLTE_SUPPORTED /* only affects support of the */
-#endif                      /* optional PLTE chunk in RGB and RGBA images */
-#if defined(PNG_READ_iTXt_SUPPORTED) || defined(PNG_READ_tEXt_SUPPORTED) || \
-    defined(PNG_READ_zTXt_SUPPORTED)
-#  define PNG_READ_TEXT_SUPPORTED
-#  define PNG_TEXT_SUPPORTED
+
+#ifndef PNG_NO_HANDLE_AS_UNKNOWN
+#  ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+#    define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+#  endif
 #endif
 
-#endif /* PNG_READ_ANCILLARY_CHUNKS_SUPPORTED */
-
+#ifdef PNG_WRITE_SUPPORTED
 #ifdef PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
 
 #ifdef PNG_NO_WRITE_TEXT
@@ -1061,17 +1081,6 @@
 #    define PNG_zTXt_SUPPORTED
 #  endif
 #endif
-#ifndef PNG_NO_WRITE_UNKNOWN_CHUNKS
-#  define PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
-#  ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
-#    define PNG_UNKNOWN_CHUNKS_SUPPORTED
-#  endif
-#  ifndef PNG_NO_HANDLE_AS_UNKNOWN
-#     ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-#       define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-#     endif
-#  endif
-#endif
 #if defined(PNG_WRITE_iTXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \
     defined(PNG_WRITE_zTXt_SUPPORTED)
 #  define PNG_WRITE_TEXT_SUPPORTED
@@ -1082,6 +1091,20 @@
 
 #endif /* PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED */
 
+#ifndef PNG_NO_WRITE_UNKNOWN_CHUNKS
+#  define PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
+#  ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
+#    define PNG_UNKNOWN_CHUNKS_SUPPORTED
+#  endif
+#endif
+
+#ifndef PNG_NO_HANDLE_AS_UNKNOWN
+#  ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+#    define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+#  endif
+#endif
+#endif /* PNG_WRITE_SUPPORTED */
+
 /* Turn this off to disable png_read_png() and
  * png_write_png() and leave the row_pointers member
  * out of the info structure.
@@ -1227,7 +1250,7 @@ typedef char            FAR * FAR * FAR * png_charppp;
 
 #if defined(PNG_1_0_X) || defined(PNG_1_2_X)
 /* SPC -  Is this stuff deprecated? */
-/* It'll be removed as of libpng-1.3.0 - GR-P */
+/* It'll be removed as of libpng-1.4.0 - GR-P */
 /* libpng typedefs for types in zlib. If zlib changes
  * or another compression library is used, then change these.
  * Eliminates need to change all the source files.
@@ -1300,7 +1323,7 @@ typedef z_stream FAR *  png_zstreamp;
 #  define PNGAPI __cdecl
 #  undef PNG_IMPEXP
 #  define PNG_IMPEXP
-#endif  
+#endif
 
 /* If you define PNGAPI, e.g., with compiler option "-DPNGAPI=__stdcall",
  * you may get warnings regarding the linkage of png_zalloc and png_zfree.

pngerror.c

@@ -1,12 +1,15 @@
 
 /* pngerror.c - stub functions for i/o and memory allocation
  *
- * Last changed in libpng 1.2.30 [August 15, 2008]
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2008 Glenn Randers-Pehrson
+ * Last changed in libpng 1.2.37 [June 4, 2009]
+ * Copyright (c) 1998-2009 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 code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
  * This file provides a location for all error handling.  Users who
  * need special error handling are expected to write replacement functions
  * and use png_set_error_fn() to use those functions.  See the instructions
@@ -44,7 +47,7 @@ png_error(png_structp png_ptr, png_const_charp error_message)
      {
        if (*error_message == '#')
        {
-         /* Strip "#nnnn " from beginning of error message. */
+           /* Strip "#nnnn " from beginning of error message. */
            int offset;
            for (offset = 1; offset<15; offset++)
               if (error_message[offset] == ' ')
@@ -116,9 +119,9 @@ png_warning(png_structp png_ptr, png_const_charp warning_message)
                   break;
        }
      }
-     if (png_ptr != NULL && png_ptr->warning_fn != NULL)
-        (*(png_ptr->warning_fn))(png_ptr, warning_message + offset);
    }
+   if (png_ptr != NULL && png_ptr->warning_fn != NULL)
+      (*(png_ptr->warning_fn))(png_ptr, warning_message + offset);
    else
       png_default_warning(png_ptr, warning_message + offset);
 }
@@ -217,7 +220,7 @@ png_default_error(png_structp png_ptr, png_const_charp error_message)
 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
    if (*error_message == '#')
    {
-     /* Strip "#nnnn " from beginning of warning message. */
+     /* Strip "#nnnn " from beginning of error message. */
      int offset;
      char error_number[16];
      for (offset = 0; offset<15; offset++)
@@ -229,15 +232,23 @@ png_default_error(png_structp png_ptr, png_const_charp error_message)
      if ((offset > 1) && (offset < 15))
      {
        error_number[offset - 1] = '\0';
-       fprintf(stderr, "libpng error no. %s: %s\n", error_number,
-          error_message + offset + 1);
+       fprintf(stderr, "libpng error no. %s: %s",
+          error_number, error_message + offset + 1);
+       fprintf(stderr, "\n");
      }
      else
-       fprintf(stderr, "libpng error: %s, offset=%d\n", error_message, offset);
+     {
+       fprintf(stderr, "libpng error: %s, offset=%d",
+          error_message, offset);
+       fprintf(stderr, "\n");
+     }
    }
    else
 #endif
-   fprintf(stderr, "libpng error: %s\n", error_message);
+   {
+      fprintf(stderr, "libpng error: %s", error_message);
+      fprintf(stderr, "\n");
+   }
 #endif
 
 #ifdef PNG_SETJMP_SUPPORTED
@@ -257,7 +268,7 @@ png_default_error(png_structp png_ptr, png_const_charp error_message)
    PNG_ABORT();
 #endif
 #ifdef PNG_NO_CONSOLE_IO
-   error_message = error_message; /* make compiler happy */
+   error_message = error_message; /* Make compiler happy */
 #endif
 }
 
@@ -285,19 +296,27 @@ png_default_warning(png_structp png_ptr, png_const_charp warning_message)
      if ((offset > 1) && (offset < 15))
      {
        warning_number[offset + 1] = '\0';
-       fprintf(stderr, "libpng warning no. %s: %s\n", warning_number,
-          warning_message + offset);
+       fprintf(stderr, "libpng warning no. %s: %s",
+          warning_number, warning_message + offset);
+       fprintf(stderr, "\n");
      }
      else
-       fprintf(stderr, "libpng warning: %s\n", warning_message);
+     {
+       fprintf(stderr, "libpng warning: %s",
+          warning_message);
+       fprintf(stderr, "\n");
+     }
    }
    else
 #  endif
-     fprintf(stderr, "libpng warning: %s\n", warning_message);
+   {
+     fprintf(stderr, "libpng warning: %s", warning_message);
+       fprintf(stderr, "\n");
+   }
 #else
-   warning_message = warning_message; /* make compiler happy */
+   warning_message = warning_message; /* Make compiler happy */
 #endif
-   png_ptr = png_ptr; /* make compiler happy */
+   png_ptr = png_ptr; /* Make compiler happy */
 }
 #endif /* PNG_NO_WARNINGS */
 

pngget.c

@@ -1,11 +1,15 @@
 
 /* pngget.c - retrieval of values from info struct
  *
- * Last changed in libpng 1.2.30 [August 15, 2008]
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2008 Glenn Randers-Pehrson
+ * Last changed in libpng 1.2.37 [June 4, 2009]
+ * Copyright (c) 1998-2009 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 code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
  */
 
 #define PNG_INTERNAL
@@ -17,6 +21,7 @@ png_get_valid(png_structp png_ptr, png_infop info_ptr, png_uint_32 flag)
 {
    if (png_ptr != NULL && info_ptr != NULL)
       return(info_ptr->valid & flag);
+
    else
       return(0);
 }
@@ -26,6 +31,7 @@ png_get_rowbytes(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
       return(info_ptr->rowbytes);
+
    else
       return(0);
 }
@@ -36,20 +42,20 @@ png_get_rows(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
       return(info_ptr->row_pointers);
+
    else
       return(0);
 }
 #endif
 
 #ifdef PNG_EASY_ACCESS_SUPPORTED
-/* easy access to info, added in libpng-0.99 */
+/* Easy access to info, added in libpng-0.99 */
 png_uint_32 PNGAPI
 png_get_image_width(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
-   {
       return info_ptr->width;
-   }
+
    return (0);
 }
 
@@ -57,9 +63,8 @@ png_uint_32 PNGAPI
 png_get_image_height(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
-   {
       return info_ptr->height;
-   }
+
    return (0);
 }
 
@@ -67,9 +72,8 @@ png_byte PNGAPI
 png_get_bit_depth(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
-   {
       return info_ptr->bit_depth;
-   }
+
    return (0);
 }
 
@@ -77,9 +81,8 @@ png_byte PNGAPI
 png_get_color_type(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
-   {
       return info_ptr->color_type;
-   }
+
    return (0);
 }
 
@@ -87,9 +90,8 @@ png_byte PNGAPI
 png_get_filter_type(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
-   {
       return info_ptr->filter_type;
-   }
+
    return (0);
 }
 
@@ -97,9 +99,8 @@ png_byte PNGAPI
 png_get_interlace_type(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
-   {
       return info_ptr->interlace_type;
-   }
+
    return (0);
 }
 
@@ -107,9 +108,8 @@ png_byte PNGAPI
 png_get_compression_type(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
-   {
       return info_ptr->compression_type;
-   }
+
    return (0);
 }
 
@@ -120,10 +120,13 @@ png_get_x_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
 #if defined(PNG_pHYs_SUPPORTED)
    if (info_ptr->valid & PNG_INFO_pHYs)
    {
-      png_debug1(1, "in %s retrieval function\n", "png_get_x_pixels_per_meter");
+      png_debug1(1, "in %s retrieval function", "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
+          return (info_ptr->x_pixels_per_unit);
    }
 #else
    return (0);
@@ -138,10 +141,13 @@ png_get_y_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
 #if defined(PNG_pHYs_SUPPORTED)
    if (info_ptr->valid & PNG_INFO_pHYs)
    {
-      png_debug1(1, "in %s retrieval function\n", "png_get_y_pixels_per_meter");
+      png_debug1(1, "in %s retrieval function", "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
+          return (info_ptr->y_pixels_per_unit);
    }
 #else
    return (0);
@@ -156,11 +162,14 @@ png_get_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
 #if defined(PNG_pHYs_SUPPORTED)
    if (info_ptr->valid & PNG_INFO_pHYs)
    {
-      png_debug1(1, "in %s retrieval function\n", "png_get_pixels_per_meter");
+      png_debug1(1, "in %s retrieval function", "png_get_pixels_per_meter");
+
       if (info_ptr->phys_unit_type != PNG_RESOLUTION_METER ||
          info_ptr->x_pixels_per_unit != info_ptr->y_pixels_per_unit)
           return (0);
-      else return (info_ptr->x_pixels_per_unit);
+
+      else
+          return (info_ptr->x_pixels_per_unit);
    }
 #else
    return (0);
@@ -174,9 +183,10 @@ 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 (info_ptr->valid & PNG_INFO_pHYs)
    {
-      png_debug1(1, "in %s retrieval function\n", "png_get_aspect_ratio");
+      png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio");
       if (info_ptr->x_pixels_per_unit == 0)
          return ((float)0.0);
       else
@@ -184,7 +194,7 @@ png_get_pixel_aspect_ratio(png_structp png_ptr, png_infop info_ptr)
             /(float)info_ptr->x_pixels_per_unit));
    }
 #else
-   return (0.0);
+      return (0.0);
 #endif
    return ((float)0.0);
 }
@@ -195,15 +205,19 @@ 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 (info_ptr->valid & PNG_INFO_oFFs)
    {
-      png_debug1(1, "in %s retrieval function\n", "png_get_x_offset_microns");
+      png_debug1(1, "in %s retrieval function", "png_get_x_offset_microns");
+
       if (info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
           return (0);
-      else return (info_ptr->x_offset);
+
+      else
+          return (info_ptr->x_offset);
    }
 #else
-   return (0);
+      return (0);
 #endif
    return (0);
 }
@@ -212,13 +226,17 @@ 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 (info_ptr->valid & PNG_INFO_oFFs)
    {
-      png_debug1(1, "in %s retrieval function\n", "png_get_y_offset_microns");
+      png_debug1(1, "in %s retrieval function", "png_get_y_offset_microns");
+
       if (info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
           return (0);
-      else return (info_ptr->y_offset);
+
+      else
+          return (info_ptr->y_offset);
    }
 #else
    return (0);
@@ -230,13 +248,17 @@ 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 (info_ptr->valid & PNG_INFO_oFFs)
    {
-      png_debug1(1, "in %s retrieval function\n", "png_get_x_offset_microns");
+      png_debug1(1, "in %s retrieval function", "png_get_x_offset_microns");
+
       if (info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
           return (0);
-      else return (info_ptr->x_offset);
+
+      else
+          return (info_ptr->x_offset);
    }
 #else
    return (0);
@@ -248,13 +270,17 @@ 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 (info_ptr->valid & PNG_INFO_oFFs)
    {
-      png_debug1(1, "in %s retrieval function\n", "png_get_y_offset_microns");
+      png_debug1(1, "in %s retrieval function", "png_get_y_offset_microns");
+
       if (info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
           return (0);
-      else return (info_ptr->y_offset);
+
+      else
+          return (info_ptr->y_offset);
    }
 #else
    return (0);
@@ -307,7 +333,7 @@ png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr,
 
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
    {
-      png_debug1(1, "in %s retrieval function\n", "pHYs");
+      png_debug1(1, "in %s retrieval function", "pHYs");
       if (res_x != NULL)
       {
          *res_x = info_ptr->x_pixels_per_unit;
@@ -364,7 +390,7 @@ png_get_bKGD(png_structp png_ptr, png_infop info_ptr,
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD)
       && background != NULL)
    {
-      png_debug1(1, "in %s retrieval function\n", "bKGD");
+      png_debug1(1, "in %s retrieval function", "bKGD");
       *background = &(info_ptr->background);
       return (PNG_INFO_bKGD);
    }
@@ -381,7 +407,7 @@ png_get_cHRM(png_structp png_ptr, png_infop info_ptr,
 {
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
    {
-      png_debug1(1, "in %s retrieval function\n", "cHRM");
+      png_debug1(1, "in %s retrieval function", "cHRM");
       if (white_x != NULL)
          *white_x = (double)info_ptr->x_white;
       if (white_y != NULL)
@@ -412,7 +438,7 @@ png_get_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
 {
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
    {
-      png_debug1(1, "in %s retrieval function\n", "cHRM");
+      png_debug1(1, "in %s retrieval function", "cHRM");
       if (white_x != NULL)
          *white_x = info_ptr->int_x_white;
       if (white_y != NULL)
@@ -444,7 +470,7 @@ png_get_gAMA(png_structp png_ptr, png_infop info_ptr, double *file_gamma)
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
       && file_gamma != NULL)
    {
-      png_debug1(1, "in %s retrieval function\n", "gAMA");
+      png_debug1(1, "in %s retrieval function", "gAMA");
       *file_gamma = (double)info_ptr->gamma;
       return (PNG_INFO_gAMA);
    }
@@ -459,7 +485,7 @@ png_get_gAMA_fixed(png_structp png_ptr, png_infop info_ptr,
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
       && int_file_gamma != NULL)
    {
-      png_debug1(1, "in %s retrieval function\n", "gAMA");
+      png_debug1(1, "in %s retrieval function", "gAMA");
       *int_file_gamma = info_ptr->int_gamma;
       return (PNG_INFO_gAMA);
    }
@@ -475,7 +501,7 @@ png_get_sRGB(png_structp png_ptr, png_infop info_ptr, int *file_srgb_intent)
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB)
       && file_srgb_intent != NULL)
    {
-      png_debug1(1, "in %s retrieval function\n", "sRGB");
+      png_debug1(1, "in %s retrieval function", "sRGB");
       *file_srgb_intent = (int)info_ptr->srgb_intent;
       return (PNG_INFO_sRGB);
    }
@@ -492,11 +518,12 @@ png_get_iCCP(png_structp png_ptr, png_infop info_ptr,
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP)
       && name != NULL && profile != NULL && proflen != NULL)
    {
-      png_debug1(1, "in %s retrieval function\n", "iCCP");
+      png_debug1(1, "in %s retrieval function", "iCCP");
       *name = info_ptr->iccp_name;
       *profile = info_ptr->iccp_profile;
-      /* compression_type is a dummy so the API won't have to change
-         if we introduce multiple compression types later. */
+      /* Compression_type is a dummy so the API won't have to change
+       * if we introduce multiple compression types later.
+       */
       *proflen = (int)info_ptr->iccp_proflen;
       *compression_type = (int)info_ptr->iccp_compression;
       return (PNG_INFO_iCCP);
@@ -526,7 +553,7 @@ png_get_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p *hist)
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST)
       && hist != NULL)
    {
-      png_debug1(1, "in %s retrieval function\n", "hIST");
+      png_debug1(1, "in %s retrieval function", "hIST");
       *hist = info_ptr->hist;
       return (PNG_INFO_hIST);
    }
@@ -544,27 +571,34 @@ png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
    if (png_ptr != NULL && info_ptr != NULL && width != NULL && height != NULL &&
       bit_depth != NULL && color_type != NULL)
    {
-      png_debug1(1, "in %s retrieval function\n", "IHDR");
+      png_debug1(1, "in %s retrieval function", "IHDR");
       *width = info_ptr->width;
       *height = info_ptr->height;
       *bit_depth = info_ptr->bit_depth;
       if (info_ptr->bit_depth < 1 || info_ptr->bit_depth > 16)
-        png_error(png_ptr, "Invalid bit depth");
+         png_error(png_ptr, "Invalid bit depth");
+
       *color_type = info_ptr->color_type;
+
       if (info_ptr->color_type > 6)
-        png_error(png_ptr, "Invalid color type");
+         png_error(png_ptr, "Invalid color type");
+
       if (compression_type != NULL)
          *compression_type = info_ptr->compression_type;
+
       if (filter_type != NULL)
          *filter_type = info_ptr->filter_type;
+
       if (interlace_type != NULL)
          *interlace_type = info_ptr->interlace_type;
 
-      /* check for potential overflow of rowbytes */
+      /* Check for potential overflow of rowbytes */
       if (*width == 0 || *width > PNG_UINT_31_MAX)
         png_error(png_ptr, "Invalid image width");
+
       if (*height == 0 || *height > PNG_UINT_31_MAX)
         png_error(png_ptr, "Invalid image height");
+
       if (info_ptr->width > (PNG_UINT_32_MAX
                  >> 3)      /* 8-byte RGBA pixels */
                  - 64       /* bigrowbuf hack */
@@ -575,6 +609,7 @@ png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
          png_warning(png_ptr,
             "Width too large for libpng to process image data.");
       }
+
       return (1);
    }
    return (0);
@@ -588,7 +623,7 @@ png_get_oFFs(png_structp png_ptr, png_infop info_ptr,
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)
       && offset_x != NULL && offset_y != NULL && unit_type != NULL)
    {
-      png_debug1(1, "in %s retrieval function\n", "oFFs");
+      png_debug1(1, "in %s retrieval function", "oFFs");
       *offset_x = info_ptr->x_offset;
       *offset_y = info_ptr->y_offset;
       *unit_type = (int)info_ptr->offset_unit_type;
@@ -605,10 +640,10 @@ png_get_pCAL(png_structp png_ptr, png_infop info_ptr,
    png_charp *units, png_charpp *params)
 {
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL)
-      && purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
-      nparams != NULL && units != NULL && params != NULL)
+       && purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
+       nparams != NULL && units != NULL && params != NULL)
    {
-      png_debug1(1, "in %s retrieval function\n", "pCAL");
+      png_debug1(1, "in %s retrieval function", "pCAL");
       *purpose = info_ptr->pcal_purpose;
       *X0 = info_ptr->pcal_X0;
       *X1 = info_ptr->pcal_X1;
@@ -629,7 +664,7 @@ png_get_sCAL(png_structp png_ptr, png_infop info_ptr,
              int *unit, double *width, double *height)
 {
     if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->valid & PNG_INFO_sCAL))
+        (info_ptr->valid & PNG_INFO_sCAL))
     {
         *unit = info_ptr->scal_unit;
         *width = info_ptr->scal_pixel_width;
@@ -645,7 +680,7 @@ png_get_sCAL_s(png_structp png_ptr, png_infop info_ptr,
              int *unit, png_charpp width, png_charpp height)
 {
     if (png_ptr != NULL && info_ptr != NULL &&
-       (info_ptr->valid & PNG_INFO_sCAL))
+        (info_ptr->valid & PNG_INFO_sCAL))
     {
         *unit = info_ptr->scal_unit;
         *width = info_ptr->scal_s_width;
@@ -668,17 +703,20 @@ png_get_pHYs(png_structp png_ptr, png_infop info_ptr,
    if (png_ptr != NULL && info_ptr != NULL &&
       (info_ptr->valid & PNG_INFO_pHYs))
    {
-      png_debug1(1, "in %s retrieval function\n", "pHYs");
+      png_debug1(1, "in %s retrieval function", "pHYs");
+
       if (res_x != NULL)
       {
          *res_x = info_ptr->x_pixels_per_unit;
          retval |= PNG_INFO_pHYs;
       }
+
       if (res_y != NULL)
       {
          *res_y = info_ptr->y_pixels_per_unit;
          retval |= PNG_INFO_pHYs;
       }
+
       if (unit_type != NULL)
       {
          *unit_type = (int)info_ptr->phys_unit_type;
@@ -696,10 +734,10 @@ png_get_PLTE(png_structp png_ptr, png_infop info_ptr, png_colorp *palette,
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_PLTE)
        && palette != NULL)
    {
-      png_debug1(1, "in %s retrieval function\n", "PLTE");
+      png_debug1(1, "in %s retrieval function", "PLTE");
       *palette = info_ptr->palette;
       *num_palette = info_ptr->num_palette;
-      png_debug1(3, "num_palette = %d\n", *num_palette);
+      png_debug1(3, "num_palette = %d", *num_palette);
       return (PNG_INFO_PLTE);
    }
    return (0);
@@ -712,7 +750,7 @@ png_get_sBIT(png_structp png_ptr, png_infop info_ptr, png_color_8p *sig_bit)
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT)
       && sig_bit != NULL)
    {
-      png_debug1(1, "in %s retrieval function\n", "sBIT");
+      png_debug1(1, "in %s retrieval function", "sBIT");
       *sig_bit = &(info_ptr->sig_bit);
       return (PNG_INFO_sBIT);
    }
@@ -727,13 +765,16 @@ png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr,
 {
    if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0)
    {
-      png_debug1(1, "in %s retrieval function\n",
+      png_debug1(1, "in %s retrieval function",
          (png_ptr->chunk_name[0] == '\0' ? "text"
              : (png_const_charp)png_ptr->chunk_name));
+
       if (text_ptr != NULL)
          *text_ptr = info_ptr->text;
+
       if (num_text != NULL)
          *num_text = info_ptr->num_text;
+
       return ((png_uint_32)info_ptr->num_text);
    }
    if (num_text != NULL)
@@ -749,7 +790,7 @@ png_get_tIME(png_structp png_ptr, png_infop info_ptr, png_timep *mod_time)
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME)
        && mod_time != NULL)
    {
-      png_debug1(1, "in %s retrieval function\n", "tIME");
+      png_debug1(1, "in %s retrieval function", "tIME");
       *mod_time = &(info_ptr->mod_time);
       return (PNG_INFO_tIME);
    }
@@ -765,7 +806,7 @@ png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
    png_uint_32 retval = 0;
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
    {
-      png_debug1(1, "in %s retrieval function\n", "tRNS");
+      png_debug1(1, "in %s retrieval function", "tRNS");
       if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
       {
           if (trans != NULL)
@@ -773,6 +814,7 @@ png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
              *trans = info_ptr->trans;
              retval |= PNG_INFO_tRNS;
           }
+
           if (trans_values != NULL)
              *trans_values = &(info_ptr->trans_values);
       }
@@ -783,6 +825,7 @@ png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
              *trans_values = &(info_ptr->trans_values);
              retval |= PNG_INFO_tRNS;
           }
+
           if (trans != NULL)
              *trans = NULL;
       }
@@ -836,54 +879,54 @@ png_get_compression_buffer_size(png_structp png_ptr)
 
 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED
 #ifndef PNG_1_0_X
-/* this function was added to libpng 1.2.0 and should exist by default */
+/* 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)
 {
-    /* obsolete, to be removed from libpng-1.4.0 */
+    /* Obsolete, to be removed from libpng-1.4.0 */
     return (png_ptr? 0L: 0L);
 }
 
-/* this function was added to libpng 1.2.0 and should exist by default */
+/* 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)
 {
-    /* obsolete, to be removed from libpng-1.4.0 */
+    /* Obsolete, to be removed from libpng-1.4.0 */
     flag_select=flag_select;
     return 0L;
 }
 
     /* GRR:  could add this:   && defined(PNG_MMX_CODE_SUPPORTED) */
-/* this function was added to libpng 1.2.0 */
+/* This function was added to libpng 1.2.0 */
 png_uint_32 PNGAPI
 png_get_mmx_flagmask (int flag_select, int *compilerID)
 {
-    /* obsolete, to be removed from libpng-1.4.0 */
+    /* Obsolete, to be removed from libpng-1.4.0 */
     flag_select=flag_select;
     *compilerID = -1;   /* unknown (i.e., no asm/MMX code compiled) */
     return 0L;
 }
 
-/* this function was added to libpng 1.2.0 */
+/* This function was added to libpng 1.2.0 */
 png_byte PNGAPI
 png_get_mmx_bitdepth_threshold (png_structp png_ptr)
 {
-    /* obsolete, to be removed from libpng-1.4.0 */
+    /* Obsolete, to be removed from libpng-1.4.0 */
     return (png_ptr? 0: 0);
 }
 
-/* this function was added to libpng 1.2.0 */
+/* This function was added to libpng 1.2.0 */
 png_uint_32 PNGAPI
 png_get_mmx_rowbytes_threshold (png_structp png_ptr)
 {
-    /* obsolete, to be removed from libpng-1.4.0 */
+    /* Obsolete, to be removed from libpng-1.4.0 */
     return (png_ptr? 0L: 0L);
 }
 #endif /* ?PNG_1_0_X */
 #endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
 
 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
-/* these functions were added to libpng 1.2.6 */
+/* These functions were added to libpng 1.2.6 */
 png_uint_32 PNGAPI
 png_get_user_width_max (png_structp png_ptr)
 {
@@ -895,6 +938,6 @@ png_get_user_height_max (png_structp png_ptr)
     return (png_ptr? png_ptr->user_height_max : 0);
 }
 #endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
- 
+
 
 #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */

pngmem.c

@@ -1,12 +1,15 @@
 
 /* pngmem.c - stub functions for memory allocation
  *
- * Last changed in libpng 1.2.30 [August 15, 2008]
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2008 Glenn Randers-Pehrson
+ * Last changed in libpng 1.2.37 [June 4, 2009]
+ * Copyright (c) 1998-2009 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 code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
  * This file provides a location for all memory allocation.  Users who
  * need special memory handling are expected to supply replacement
  * functions for png_malloc() and png_free(), and to use
@@ -20,7 +23,7 @@
 
 /* Borland DOS special memory handler */
 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
-/* if you change this, be sure to change the one in png.h also */
+/* If you change this, be sure to change the one in png.h also */
 
 /* Allocate memory for a png_struct.  The malloc and memset can be replaced
    by a single call to calloc() if this is thought to improve performance. */
@@ -40,11 +43,11 @@ png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
    png_voidp struct_ptr;
 
    if (type == PNG_STRUCT_INFO)
-     size = png_sizeof(png_info);
+      size = png_sizeof(png_info);
    else if (type == PNG_STRUCT_PNG)
-     size = png_sizeof(png_struct);
+      size = png_sizeof(png_struct);
    else
-     return (png_get_copyright(NULL));
+      return (png_get_copyright(NULL));
 
 #ifdef PNG_USER_MEM_SUPPORTED
    if (malloc_fn != NULL)
@@ -56,7 +59,7 @@ png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
    }
    else
 #endif /* PNG_USER_MEM_SUPPORTED */
-      struct_ptr = (png_voidp)farmalloc(size);
+   struct_ptr = (png_voidp)farmalloc(size);
    if (struct_ptr != NULL)
       png_memset(struct_ptr, 0, size);
    return (struct_ptr);
@@ -122,9 +125,9 @@ png_malloc(png_structp png_ptr, png_uint_32 size)
 
 #ifdef PNG_USER_MEM_SUPPORTED
    if (png_ptr->malloc_fn != NULL)
-       ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
+      ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
    else
-       ret = (png_malloc_default(png_ptr, size));
+      ret = (png_malloc_default(png_ptr, size));
    if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
        png_error(png_ptr, "Out of memory!");
    return (ret);
@@ -149,12 +152,12 @@ png_malloc_default(png_structp png_ptr, png_uint_32 size)
 #endif
 
    if (size != (size_t)size)
-     ret = NULL;
+      ret = NULL;
    else if (size == (png_uint_32)65536L)
    {
       if (png_ptr->offset_table == NULL)
       {
-         /* try to see if we need to do any of this fancy stuff */
+         /* Try to see if we need to do any of this fancy stuff */
          ret = farmalloc(size);
          if (ret == NULL || ((png_size_t)ret & 0xffff))
          {
@@ -269,10 +272,10 @@ png_malloc_default(png_structp png_ptr, png_uint_32 size)
    return (ret);
 }
 
-/* free a pointer allocated by png_malloc().  In the default
-   configuration, png_ptr is not used, but is passed in case it
-   is needed.  If ptr is NULL, return without taking any action. */
-
+/* Free a pointer allocated by png_malloc().  In the default
+ * configuration, png_ptr is not used, but is passed in case it
+ * is needed.  If ptr is NULL, return without taking any action.
+ */
 void PNGAPI
 png_free(png_structp png_ptr, png_voidp ptr)
 {
@@ -285,7 +288,8 @@ png_free(png_structp png_ptr, png_voidp ptr)
       (*(png_ptr->free_fn))(png_ptr, ptr);
       return;
    }
-   else png_free_default(png_ptr, ptr);
+   else
+      png_free_default(png_ptr, ptr);
 }
 
 void PNGAPI
@@ -293,7 +297,8 @@ png_free_default(png_structp png_ptr, png_voidp ptr)
 {
 #endif /* PNG_USER_MEM_SUPPORTED */
 
-   if (png_ptr == NULL || ptr == NULL) return;
+   if (png_ptr == NULL || ptr == NULL)
+      return;
 
    if (png_ptr->offset_table != NULL)
    {
@@ -420,10 +425,12 @@ png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
 }
 
 /* Allocate memory.  For reasonable files, size should never exceed
-   64K.  However, zlib may allocate more then 64K if you don't tell
-   it not to.  See zconf.h and png.h for more information.  zlib does
-   need to allocate exactly 64K, so whatever you call here must
-   have the ability to do that. */
+ * 64K.  However, zlib may allocate more then 64K if you don't tell
+ * it not to.  See zconf.h and png.h for more information.  zlib does
+ * need to allocate exactly 64K, so whatever you call here must
+ * have the ability to do that.
+ */
+
 
 png_voidp PNGAPI
 png_malloc(png_structp png_ptr, png_uint_32 size)
@@ -435,9 +442,9 @@ png_malloc(png_structp png_ptr, png_uint_32 size)
       return (NULL);
 
    if (png_ptr->malloc_fn != NULL)
-       ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
+      ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
    else
-       ret = (png_malloc_default(png_ptr, size));
+      ret = (png_malloc_default(png_ptr, size));
    if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
        png_error(png_ptr, "Out of Memory!");
    return (ret);
@@ -464,23 +471,23 @@ png_malloc_default(png_structp png_ptr, png_uint_32 size)
    }
 #endif
 
- /* Check for overflow */
+   /* Check for overflow */
 #if defined(__TURBOC__) && !defined(__FLAT__)
- if (size != (unsigned long)size)
-   ret = NULL;
- else
-   ret = farmalloc(size);
+   if (size != (unsigned long)size)
+      ret = NULL;
+   else
+      ret = farmalloc(size);
 #else
 # if defined(_MSC_VER) && defined(MAXSEG_64K)
- if (size != (unsigned long)size)
-   ret = NULL;
- else
-   ret = halloc(size, 1);
+   if (size != (unsigned long)size)
+      ret = NULL;
+   else
+      ret = halloc(size, 1);
 # else
- if (size != (size_t)size)
-   ret = NULL;
- else
-   ret = malloc((size_t)size);
+   if (size != (size_t)size)
+      ret = NULL;
+   else
+      ret = malloc((size_t)size);
 # endif
 #endif
 
@@ -493,7 +500,8 @@ png_malloc_default(png_structp png_ptr, png_uint_32 size)
 }
 
 /* Free a pointer allocated by png_malloc().  If ptr is NULL, return
-   without taking any action. */
+ * without taking any action.
+ */
 void PNGAPI
 png_free(png_structp png_ptr, png_voidp ptr)
 {
@@ -506,7 +514,8 @@ png_free(png_structp png_ptr, png_voidp ptr)
       (*(png_ptr->free_fn))(png_ptr, ptr);
       return;
    }
-   else png_free_default(png_ptr, ptr);
+   else
+      png_free_default(png_ptr, ptr);
 }
 void PNGAPI
 png_free_default(png_structp png_ptr, png_voidp ptr)
@@ -542,7 +551,8 @@ png_malloc_warn(png_structp png_ptr, png_uint_32 size)
 {
    png_voidp ptr;
    png_uint_32 save_flags;
-   if (png_ptr == NULL) return (NULL);
+   if (png_ptr == NULL)
+      return (NULL);
 
    save_flags = png_ptr->flags;
    png_ptr->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
@@ -602,7 +612,8 @@ png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr
 png_voidp PNGAPI
 png_get_mem_ptr(png_structp png_ptr)
 {
-   if (png_ptr == NULL) return (NULL);
+   if (png_ptr == NULL)
+      return (NULL);
    return ((png_voidp)png_ptr->mem_ptr);
 }
 #endif /* PNG_USER_MEM_SUPPORTED */

pngpread.c

@@ -1,18 +1,21 @@
 
 /* pngpread.c - read a png file in push mode
  *
- * Last changed in libpng 1.2.32 [September 18, 2008]
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2008 Glenn Randers-Pehrson
+ * Last changed in libpng 1.2.38 [July 16, 2009]
+ * Copyright (c) 1998-2009 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 code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
  */
 
 #define PNG_INTERNAL
 #include "png.h"
 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
 
-/* push model modes */
+/* Push model modes */
 #define PNG_READ_SIG_MODE   0
 #define PNG_READ_CHUNK_MODE 1
 #define PNG_READ_IDAT_MODE  2
@@ -27,7 +30,9 @@ void PNGAPI
 png_process_data(png_structp png_ptr, png_infop info_ptr,
    png_bytep buffer, png_size_t buffer_size)
 {
-   if (png_ptr == NULL || info_ptr == NULL) return;
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
    png_push_restore_buffer(png_ptr, buffer, buffer_size);
 
    while (png_ptr->buffer_size)
@@ -42,7 +47,9 @@ png_process_data(png_structp png_ptr, png_infop info_ptr,
 void /* PRIVATE */
 png_process_some_data(png_structp png_ptr, png_infop info_ptr)
 {
-   if (png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
+
    switch (png_ptr->process_mode)
    {
       case PNG_READ_SIG_MODE:
@@ -50,22 +57,26 @@ png_process_some_data(png_structp png_ptr, png_infop info_ptr)
          png_push_read_sig(png_ptr, info_ptr);
          break;
       }
+
       case PNG_READ_CHUNK_MODE:
       {
          png_push_read_chunk(png_ptr, info_ptr);
          break;
       }
+
       case PNG_READ_IDAT_MODE:
       {
          png_push_read_IDAT(png_ptr);
          break;
       }
+
 #if defined(PNG_READ_tEXt_SUPPORTED)
       case PNG_READ_tEXt_MODE:
       {
          png_push_read_tEXt(png_ptr, info_ptr);
          break;
       }
+
 #endif
 #if defined(PNG_READ_zTXt_SUPPORTED)
       case PNG_READ_zTXt_MODE:
@@ -73,6 +84,7 @@ png_process_some_data(png_structp png_ptr, png_infop info_ptr)
          png_push_read_zTXt(png_ptr, info_ptr);
          break;
       }
+
 #endif
 #if defined(PNG_READ_iTXt_SUPPORTED)
       case PNG_READ_iTXt_MODE:
@@ -80,12 +92,14 @@ png_process_some_data(png_structp png_ptr, png_infop info_ptr)
          png_push_read_iTXt(png_ptr, info_ptr);
          break;
       }
+
 #endif
       case PNG_SKIP_MODE:
       {
          png_push_crc_finish(png_ptr);
          break;
       }
+
       default:
       {
          png_ptr->buffer_size = 0;
@@ -224,13 +238,16 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
    {
       if (png_ptr->push_length != 13)
          png_error(png_ptr, "Invalid IHDR length");
+
       if (png_ptr->push_length + 4 > png_ptr->buffer_size)
       {
          png_push_save_buffer(png_ptr);
          return;
       }
+
       png_handle_IHDR(png_ptr, info_ptr, png_ptr->push_length);
    }
+
    else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
    {
       if (png_ptr->push_length + 4 > png_ptr->buffer_size)
@@ -238,11 +255,13 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
          png_push_save_buffer(png_ptr);
          return;
       }
+
       png_handle_IEND(png_ptr, info_ptr, png_ptr->push_length);
 
       png_ptr->process_mode = PNG_READ_DONE_MODE;
       png_push_have_end(png_ptr, info_ptr);
    }
+
 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
    else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name))
    {
@@ -251,20 +270,26 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
          png_push_save_buffer(png_ptr);
          return;
       }
+
       if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
          png_ptr->mode |= PNG_HAVE_IDAT;
+
       png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length);
+
       if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
          png_ptr->mode |= PNG_HAVE_PLTE;
+
       else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
       {
          if (!(png_ptr->mode & PNG_HAVE_IHDR))
             png_error(png_ptr, "Missing IHDR before IDAT");
+
          else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
                   !(png_ptr->mode & PNG_HAVE_PLTE))
             png_error(png_ptr, "Missing PLTE before IDAT");
       }
    }
+
 #endif
    else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
    {
@@ -275,23 +300,26 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
       }
       png_handle_PLTE(png_ptr, info_ptr, png_ptr->push_length);
    }
+
    else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
    {
       /* If we reach an IDAT chunk, this means we have read all of the
        * header chunks, and we can start reading the image (or if this
        * is called after the image has been read - we have an error).
        */
-     if (!(png_ptr->mode & PNG_HAVE_IHDR))
-       png_error(png_ptr, "Missing IHDR before IDAT");
-     else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
-         !(png_ptr->mode & PNG_HAVE_PLTE))
-       png_error(png_ptr, "Missing PLTE before IDAT");
+
+      if (!(png_ptr->mode & PNG_HAVE_IHDR))
+         png_error(png_ptr, "Missing IHDR before IDAT");
+
+      else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
+          !(png_ptr->mode & PNG_HAVE_PLTE))
+         png_error(png_ptr, "Missing PLTE before IDAT");
 
       if (png_ptr->mode & PNG_HAVE_IDAT)
       {
          if (!(png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
-           if (png_ptr->push_length == 0)
-              return;
+            if (png_ptr->push_length == 0)
+               return;
 
          if (png_ptr->mode & PNG_AFTER_IDAT)
             png_error(png_ptr, "Too many IDAT's found");
@@ -305,6 +333,7 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
       png_ptr->zstream.next_out = png_ptr->row_buf;
       return;
    }
+
 #if defined(PNG_READ_gAMA_SUPPORTED)
    else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4))
    {
@@ -313,8 +342,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
          png_push_save_buffer(png_ptr);
          return;
       }
+
       png_handle_gAMA(png_ptr, info_ptr, png_ptr->push_length);
    }
+
 #endif
 #if defined(PNG_READ_sBIT_SUPPORTED)
    else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4))
@@ -324,8 +355,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
          png_push_save_buffer(png_ptr);
          return;
       }
+
       png_handle_sBIT(png_ptr, info_ptr, png_ptr->push_length);
    }
+
 #endif
 #if defined(PNG_READ_cHRM_SUPPORTED)
    else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4))
@@ -335,8 +368,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
          png_push_save_buffer(png_ptr);
          return;
       }
+
       png_handle_cHRM(png_ptr, info_ptr, png_ptr->push_length);
    }
+
 #endif
 #if defined(PNG_READ_sRGB_SUPPORTED)
    else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4))
@@ -346,8 +381,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
          png_push_save_buffer(png_ptr);
          return;
       }
+
       png_handle_sRGB(png_ptr, info_ptr, png_ptr->push_length);
    }
+
 #endif
 #if defined(PNG_READ_iCCP_SUPPORTED)
    else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4))
@@ -357,8 +394,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
          png_push_save_buffer(png_ptr);
          return;
       }
+
       png_handle_iCCP(png_ptr, info_ptr, png_ptr->push_length);
    }
+
 #endif
 #if defined(PNG_READ_sPLT_SUPPORTED)
    else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4))
@@ -368,8 +407,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
          png_push_save_buffer(png_ptr);
          return;
       }
+
       png_handle_sPLT(png_ptr, info_ptr, png_ptr->push_length);
    }
+
 #endif
 #if defined(PNG_READ_tRNS_SUPPORTED)
    else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4))
@@ -379,8 +420,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
          png_push_save_buffer(png_ptr);
          return;
       }
+
       png_handle_tRNS(png_ptr, info_ptr, png_ptr->push_length);
    }
+
 #endif
 #if defined(PNG_READ_bKGD_SUPPORTED)
    else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4))
@@ -390,8 +433,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
          png_push_save_buffer(png_ptr);
          return;
       }
+
       png_handle_bKGD(png_ptr, info_ptr, png_ptr->push_length);
    }
+
 #endif
 #if defined(PNG_READ_hIST_SUPPORTED)
    else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4))
@@ -401,8 +446,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
          png_push_save_buffer(png_ptr);
          return;
       }
+
       png_handle_hIST(png_ptr, info_ptr, png_ptr->push_length);
    }
+
 #endif
 #if defined(PNG_READ_pHYs_SUPPORTED)
    else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4))
@@ -412,8 +459,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
          png_push_save_buffer(png_ptr);
          return;
       }
+
       png_handle_pHYs(png_ptr, info_ptr, png_ptr->push_length);
    }
+
 #endif
 #if defined(PNG_READ_oFFs_SUPPORTED)
    else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4))
@@ -423,9 +472,11 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
          png_push_save_buffer(png_ptr);
          return;
       }
+
       png_handle_oFFs(png_ptr, info_ptr, png_ptr->push_length);
    }
 #endif
+
 #if defined(PNG_READ_pCAL_SUPPORTED)
    else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4))
    {
@@ -434,8 +485,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
          png_push_save_buffer(png_ptr);
          return;
       }
+
       png_handle_pCAL(png_ptr, info_ptr, png_ptr->push_length);
    }
+
 #endif
 #if defined(PNG_READ_sCAL_SUPPORTED)
    else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4))
@@ -445,8 +498,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
          png_push_save_buffer(png_ptr);
          return;
       }
+
       png_handle_sCAL(png_ptr, info_ptr, png_ptr->push_length);
    }
+
 #endif
 #if defined(PNG_READ_tIME_SUPPORTED)
    else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4))
@@ -456,8 +511,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
          png_push_save_buffer(png_ptr);
          return;
       }
+
       png_handle_tIME(png_ptr, info_ptr, png_ptr->push_length);
    }
+
 #endif
 #if defined(PNG_READ_tEXt_SUPPORTED)
    else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4))
@@ -467,8 +524,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
          png_push_save_buffer(png_ptr);
          return;
       }
+
       png_push_handle_tEXt(png_ptr, info_ptr, png_ptr->push_length);
    }
+
 #endif
 #if defined(PNG_READ_zTXt_SUPPORTED)
    else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4))
@@ -478,8 +537,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
          png_push_save_buffer(png_ptr);
          return;
       }
+
       png_push_handle_zTXt(png_ptr, info_ptr, png_ptr->push_length);
    }
+
 #endif
 #if defined(PNG_READ_iTXt_SUPPORTED)
    else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
@@ -489,8 +550,10 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
          png_push_save_buffer(png_ptr);
          return;
       }
+
       png_push_handle_iTXt(png_ptr, info_ptr, png_ptr->push_length);
    }
+
 #endif
    else
    {
@@ -565,7 +628,9 @@ png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length)
 {
    png_bytep ptr;
 
-   if (png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
+
    ptr = buffer;
    if (png_ptr->save_buffer_size)
    {
@@ -589,6 +654,7 @@ png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length)
 
       if (length < png_ptr->current_buffer_size)
          save_size = length;
+
       else
          save_size = png_ptr->current_buffer_size;
 
@@ -629,6 +695,7 @@ png_push_save_buffer(png_structp png_ptr)
       {
         png_error(png_ptr, "Potential overflow of save_buffer");
       }
+
       new_max = png_ptr->save_buffer_size + png_ptr->current_buffer_size + 256;
       old_buffer = png_ptr->save_buffer;
       png_ptr->save_buffer = (png_bytep)png_malloc(png_ptr,
@@ -697,7 +764,8 @@ png_push_read_IDAT(png_structp png_ptr)
       if (png_ptr->idat_size < (png_uint_32)png_ptr->save_buffer_size)
       {
          save_size = (png_size_t)png_ptr->idat_size;
-         /* check for overflow */
+
+         /* Check for overflow */
          if ((png_uint_32)save_size != png_ptr->idat_size)
             png_error(png_ptr, "save_size overflowed in pngpread");
       }
@@ -705,8 +773,10 @@ png_push_read_IDAT(png_structp png_ptr)
          save_size = png_ptr->save_buffer_size;
 
       png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size);
+
       if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
          png_process_IDAT_data(png_ptr, png_ptr->save_buffer_ptr, save_size);
+
       png_ptr->idat_size -= save_size;
       png_ptr->buffer_size -= save_size;
       png_ptr->save_buffer_size -= save_size;
@@ -719,7 +789,8 @@ png_push_read_IDAT(png_structp png_ptr)
       if (png_ptr->idat_size < (png_uint_32)png_ptr->current_buffer_size)
       {
          save_size = (png_size_t)png_ptr->idat_size;
-         /* check for overflow */
+
+         /* Check for overflow */
          if ((png_uint_32)save_size != png_ptr->idat_size)
             png_error(png_ptr, "save_size overflowed in pngpread");
       }
@@ -769,6 +840,7 @@ png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,
          {
             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);
@@ -780,6 +852,7 @@ png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,
          }
          else if (ret == Z_BUF_ERROR)
             break;
+
          else
             png_error(png_ptr, "Decompression Error");
       }
@@ -801,6 +874,7 @@ png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,
          png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes;
          png_ptr->zstream.next_out = png_ptr->row_buf;
       }
+
       else
          break;
    }
@@ -829,7 +903,7 @@ png_push_process_row(png_structp png_ptr)
       png_do_read_transformations(png_ptr);
 
 #if defined(PNG_READ_INTERLACING_SUPPORTED)
-   /* blow up interlaced rows to full size */
+   /* Blow up interlaced rows to full size */
    if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
    {
       if (png_ptr->pass < 6)
@@ -847,9 +921,10 @@ png_push_process_row(png_structp png_ptr)
             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); /* updates png_ptr->pass */
+               png_read_push_finish_row(png_ptr); /* Updates png_ptr->pass */
             }
-            if (png_ptr->pass == 2) /* pass 1 might be empty */
+
+            if (png_ptr->pass == 2) /* Pass 1 might be empty */
             {
                for (i = 0; i < 4 && png_ptr->pass == 2; i++)
                {
@@ -857,6 +932,7 @@ png_push_process_row(png_structp png_ptr)
                   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++)
@@ -865,13 +941,16 @@ png_push_process_row(png_structp png_ptr)
                   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;
          }
+
          case 1:
          {
             int i;
@@ -880,7 +959,8 @@ 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) /* skip top 4 generated rows */
+
+            if (png_ptr->pass == 2) /* Skip top 4 generated rows */
             {
                for (i = 0; i < 4 && png_ptr->pass == 2; i++)
                {
@@ -888,22 +968,27 @@ png_push_process_row(png_structp png_ptr)
                   png_read_push_finish_row(png_ptr);
                }
             }
+
             break;
          }
+
          case 2:
          {
             int i;
+
             for (i = 0; i < 4 && png_ptr->pass == 2; i++)
             {
                png_push_have_row(png_ptr, png_ptr->row_buf + 1);
                png_read_push_finish_row(png_ptr);
             }
+
             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) /* pass 3 might be empty */
+
+            if (png_ptr->pass == 4) /* Pass 3 might be empty */
             {
                for (i = 0; i < 2 && png_ptr->pass == 4; i++)
                {
@@ -911,17 +996,21 @@ png_push_process_row(png_structp png_ptr)
                   png_read_push_finish_row(png_ptr);
                }
             }
+
             break;
          }
+
          case 3:
          {
             int i;
+
             for (i = 0; i < 4 && png_ptr->pass == 3; i++)
             {
                png_push_have_row(png_ptr, png_ptr->row_buf + 1);
                png_read_push_finish_row(png_ptr);
             }
-            if (png_ptr->pass == 4) /* skip top two generated rows */
+
+            if (png_ptr->pass == 4) /* Skip top two generated rows */
             {
                for (i = 0; i < 2 && png_ptr->pass == 4; i++)
                {
@@ -929,49 +1018,61 @@ png_push_process_row(png_structp png_ptr)
                   png_read_push_finish_row(png_ptr);
                }
             }
+
             break;
          }
+
          case 4:
          {
             int i;
+
             for (i = 0; i < 2 && png_ptr->pass == 4; i++)
             {
                png_push_have_row(png_ptr, png_ptr->row_buf + 1);
                png_read_push_finish_row(png_ptr);
             }
+
             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) /* pass 5 might be empty */
+
+            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;
          }
+
          case 5:
          {
             int i;
+
             for (i = 0; i < 2 && png_ptr->pass == 5; i++)
             {
                png_push_have_row(png_ptr, png_ptr->row_buf + 1);
                png_read_push_finish_row(png_ptr);
             }
-            if (png_ptr->pass == 6) /* skip top generated row */
+
+            if (png_ptr->pass == 6) /* Skip top generated row */
             {
                png_push_have_row(png_ptr, png_bytep_NULL);
                png_read_push_finish_row(png_ptr);
             }
+
             break;
          }
          case 6:
          {
             png_push_have_row(png_ptr, png_ptr->row_buf + 1);
             png_read_push_finish_row(png_ptr);
+
             if (png_ptr->pass != 6)
                break;
+
             png_push_have_row(png_ptr, png_bytep_NULL);
             png_read_push_finish_row(png_ptr);
          }
@@ -989,18 +1090,18 @@ void /* PRIVATE */
 png_read_push_finish_row(png_structp png_ptr)
 {
 #ifdef PNG_USE_LOCAL_ARRAYS
-   /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+   /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
 
-   /* start of interlace block */
+   /* Start of interlace block */
    PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
 
-   /* offset to next interlace block */
+   /* Offset to next interlace block */
    PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
 
-   /* start of interlace block in the y direction */
+   /* Start of interlace block in the y direction */
    PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
 
-   /* offset to next interlace block in the y direction */
+   /* Offset to next interlace block in the y direction */
    PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
 
    /* Height of interlace block.  This is not currently used - if you need
@@ -1013,6 +1114,7 @@ png_read_push_finish_row(png_structp png_ptr)
    if (png_ptr->row_number < png_ptr->num_rows)
       return;
 
+#if defined(PNG_READ_INTERLACING_SUPPORTED)
    if (png_ptr->interlaced)
    {
       png_ptr->row_number = 0;
@@ -1028,6 +1130,7 @@ png_read_push_finish_row(png_structp png_ptr)
 
          if (png_ptr->pass > 7)
             png_ptr->pass--;
+
          if (png_ptr->pass >= 7)
             break;
 
@@ -1049,6 +1152,7 @@ png_read_push_finish_row(png_structp png_ptr)
 
       } while (png_ptr->iwidth == 0 || png_ptr->num_rows == 0);
    }
+#endif /* PNG_READ_INTERLACING_SUPPORTED */
 }
 
 #if defined(PNG_READ_tEXt_SUPPORTED)
@@ -1059,7 +1163,7 @@ png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
    if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
       {
          png_error(png_ptr, "Out of place tEXt");
-         info_ptr = info_ptr; /* to quiet some compiler warnings */
+         info_ptr = info_ptr; /* To quiet some compiler warnings */
       }
 
 #ifdef PNG_MAX_MALLOC_64K
@@ -1091,8 +1195,10 @@ png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)
 
       if (png_ptr->buffer_size < png_ptr->current_text_left)
          text_size = png_ptr->buffer_size;
+
       else
          text_size = png_ptr->current_text_left;
+
       png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
       png_ptr->current_text_left -= text_size;
       png_ptr->current_text_ptr += text_size;
@@ -1120,7 +1226,7 @@ png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)
       key = png_ptr->current_text;
 
       for (text = key; *text; text++)
-         /* empty loop */ ;
+         /* Empty loop */ ;
 
       if (text < key + png_ptr->current_text_size)
          text++;
@@ -1155,7 +1261,7 @@ png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
    if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
       {
          png_error(png_ptr, "Out of place zTXt");
-         info_ptr = info_ptr; /* to quiet some compiler warnings */
+         info_ptr = info_ptr; /* To quiet some compiler warnings */
       }
 
 #ifdef PNG_MAX_MALLOC_64K
@@ -1189,8 +1295,10 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
 
       if (png_ptr->buffer_size < (png_uint_32)png_ptr->current_text_left)
          text_size = png_ptr->buffer_size;
+
       else
          text_size = png_ptr->current_text_left;
+
       png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
       png_ptr->current_text_left -= text_size;
       png_ptr->current_text_ptr += text_size;
@@ -1214,7 +1322,7 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
       key = png_ptr->current_text;
 
       for (text = key; *text; text++)
-         /* empty loop */ ;
+         /* Empty loop */ ;
 
       /* zTXt can't have zero text */
       if (text >= key + png_ptr->current_text_size)
@@ -1226,7 +1334,7 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
 
       text++;
 
-      if (*text != PNG_TEXT_COMPRESSION_zTXt) /* check compression byte */
+      if (*text != PNG_TEXT_COMPRESSION_zTXt) /* Check compression byte */
       {
          png_ptr->current_text = NULL;
          png_free(png_ptr, key);
@@ -1265,11 +1373,15 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
                text = (png_charp)png_malloc(png_ptr,
                      (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);
+
                text_size = key_size + png_ptr->zbuf_size -
                   png_ptr->zstream.avail_out;
+
                *(text + text_size) = '\0';
             }
             else
@@ -1280,10 +1392,13 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
                text = (png_charp)png_malloc(png_ptr, text_size +
                   (png_uint_32)(png_ptr->zbuf_size 
                   - png_ptr->zstream.avail_out + 1));
+
                png_memcpy(text, tmp, text_size);
                png_free(png_ptr, tmp);
+
                png_memcpy(text + text_size, png_ptr->zbuf,
                   png_ptr->zbuf_size - png_ptr->zstream.avail_out);
+
                text_size += png_ptr->zbuf_size - png_ptr->zstream.avail_out;
                *(text + text_size) = '\0';
             }
@@ -1347,7 +1462,7 @@ png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
    if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
       {
          png_error(png_ptr, "Out of place iTXt");
-         info_ptr = info_ptr; /* to quiet some compiler warnings */
+         info_ptr = info_ptr; /* To quiet some compiler warnings */
       }
 
 #ifdef PNG_MAX_MALLOC_64K
@@ -1380,8 +1495,10 @@ png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
 
       if (png_ptr->buffer_size < png_ptr->current_text_left)
          text_size = png_ptr->buffer_size;
+
       else
          text_size = png_ptr->current_text_left;
+
       png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
       png_ptr->current_text_left -= text_size;
       png_ptr->current_text_ptr += text_size;
@@ -1412,23 +1529,25 @@ png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
       key = png_ptr->current_text;
 
       for (lang = key; *lang; lang++)
-         /* empty loop */ ;
+         /* Empty loop */ ;
 
       if (lang < key + png_ptr->current_text_size - 3)
          lang++;
 
       comp_flag = *lang++;
-      lang++;     /* skip comp_type, always zero */
+      lang++;     /* Skip comp_type, always zero */
 
       for (lang_key = lang; *lang_key; lang_key++)
-         /* empty loop */ ;
-      lang_key++;        /* skip NUL separator */
+         /* Empty loop */ ;
+
+      lang_key++;        /* Skip NUL separator */
 
       text=lang_key;
+
       if (lang_key < key + png_ptr->current_text_size - 1)
       {
         for (; *text; text++)
-           /* empty loop */ ;
+           /* Empty loop */ ;
       }
 
       if (text < key + png_ptr->current_text_size)
@@ -1436,6 +1555,7 @@ png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
 
       text_ptr = (png_textp)png_malloc(png_ptr,
          (png_uint_32)png_sizeof(png_text));
+
       text_ptr->compression = comp_flag + 2;
       text_ptr->key = key;
       text_ptr->lang = lang;
@@ -1477,7 +1597,7 @@ png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32
 #endif
          png_chunk_error(png_ptr, "unknown critical chunk");
 
-      info_ptr = info_ptr; /* to quiet some compiler warnings */
+      info_ptr = info_ptr; /* To quiet some compiler warnings */
    }
 
 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
@@ -1498,23 +1618,28 @@ png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32
         = '\0';
 
       png_ptr->unknown_chunk.size = (png_size_t)length;
+
       if (length == 0)
          png_ptr->unknown_chunk.data = NULL;
+
       else
       {
          png_ptr->unknown_chunk.data = (png_bytep)png_malloc(png_ptr,
        (png_uint_32)length);
          png_crc_read(png_ptr, (png_bytep)png_ptr->unknown_chunk.data, length);
       }
+
 #if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
       if (png_ptr->read_user_chunk_fn != NULL)
       {
-         /* callback to user unknown chunk handler */
+         /* Callback to user unknown chunk handler */
          int ret;
          ret = (*(png_ptr->read_user_chunk_fn))
            (png_ptr, &png_ptr->unknown_chunk);
+
          if (ret < 0)
             png_chunk_error(png_ptr, "error in user chunk");
+
          if (ret == 0)
          {
             if (!(png_ptr->chunk_name[0] & 0x20))
@@ -1525,12 +1650,14 @@ png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32
                &png_ptr->unknown_chunk, 1);
          }
       }
+
       else
 #endif
         png_set_unknown_chunks(png_ptr, info_ptr, &png_ptr->unknown_chunk, 1);
       png_free(png_ptr, png_ptr->unknown_chunk.data);
       png_ptr->unknown_chunk.data = NULL;
    }
+
    else
 #endif
       skip=length;
@@ -1567,7 +1694,9 @@ png_progressive_combine_row (png_structp png_ptr,
    PNG_CONST int FARDATA png_pass_dsp_mask[7] =
       {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
 #endif
-   if (png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
+
    if (new_row != NULL)    /* new_row must == png_ptr->row_buf here. */
       png_combine_row(png_ptr, old_row, png_pass_dsp_mask[png_ptr->pass]);
 }
@@ -1577,7 +1706,9 @@ png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr,
    png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
    png_progressive_end_ptr end_fn)
 {
-   if (png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
+
    png_ptr->info_fn = info_fn;
    png_ptr->row_fn = row_fn;
    png_ptr->end_fn = end_fn;
@@ -1588,7 +1719,9 @@ png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr,
 png_voidp PNGAPI
 png_get_progressive_ptr(png_structp png_ptr)
 {
-   if (png_ptr == NULL) return (NULL);
+   if (png_ptr == NULL)
+      return (NULL);
+
    return png_ptr->io_ptr;
 }
 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */

pngread.c

@@ -1,12 +1,15 @@
 
 /* pngread.c - read a PNG file
  *
- * Last changed in libpng 1.2.30 [August 15, 2008]
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2008 Glenn Randers-Pehrson
+ * Last changed in libpng 1.2.37 [June 4, 2009]
+ * Copyright (c) 1998-2009 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 code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
  * This file contains routines that an application calls directly to
  * read a PNG file or stream.
  */
@@ -47,7 +50,7 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
 
    int i;
 
-   png_debug(1, "in png_create_read_struct\n");
+   png_debug(1, "in png_create_read_struct");
 #ifdef PNG_USER_MEM_SUPPORTED
    png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
       (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
@@ -57,7 +60,7 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
    if (png_ptr == NULL)
       return (NULL);
 
-   /* added at libpng-1.2.6 */
+   /* Added at libpng-1.2.6 */
 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
    png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
    png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
@@ -102,7 +105,7 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
    }
    else
         png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
-   
+
 
    if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
    {
@@ -137,7 +140,7 @@ png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
      }
    }
 
-   /* initialize zbuf - compression buffer */
+   /* 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);
@@ -192,7 +195,8 @@ png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver,
    png_size_t png_struct_size, png_size_t png_info_size)
 {
    /* We only come here via pre-1.0.12-compiled applications */
-   if (png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
    if (png_sizeof(png_struct) > png_struct_size ||
       png_sizeof(png_info) > png_info_size)
@@ -246,7 +250,8 @@ png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
 
    png_structp png_ptr=*ptr_ptr;
 
-   if (png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
 
    do
    {
@@ -263,10 +268,10 @@ png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
      }
    } while (png_libpng_ver[i++]);
 
-   png_debug(1, "in png_read_init_3\n");
+   png_debug(1, "in png_read_init_3");
 
 #ifdef PNG_SETJMP_SUPPORTED
-   /* save jump buffer and error functions */
+   /* Save jump buffer and error functions */
    png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
 #endif
 
@@ -277,21 +282,21 @@ png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
       png_ptr = *ptr_ptr;
    }
 
-   /* reset all variables to 0 */
+   /* Reset all variables to 0 */
    png_memset(png_ptr, 0, png_sizeof(png_struct));
 
 #ifdef PNG_SETJMP_SUPPORTED
-   /* restore jump buffer */
+   /* Restore jump buffer */
    png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
 #endif
 
-   /* added at libpng-1.2.6 */
+   /* Added at libpng-1.2.6 */
 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
    png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
    png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
 #endif
 
-   /* initialize zbuf - compression buffer */
+   /* 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);
@@ -326,8 +331,9 @@ png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
 void PNGAPI
 png_read_info(png_structp png_ptr, png_infop info_ptr)
 {
-   if (png_ptr == NULL || info_ptr == NULL) return;
-   png_debug(1, "in png_read_info\n");
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+   png_debug(1, "in png_read_info");
    /* If we haven't checked all of the PNG signature bytes, do so now. */
    if (png_ptr->sig_bytes < 8)
    {
@@ -529,12 +535,13 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
 }
 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
 
-/* optional call to update the users info_ptr structure */
+/* Optional call to update the users info_ptr structure */
 void PNGAPI
 png_read_update_info(png_structp png_ptr, png_infop info_ptr)
 {
-   png_debug(1, "in png_read_update_info\n");
-   if (png_ptr == NULL) return;
+   png_debug(1, "in png_read_update_info");
+   if (png_ptr == NULL)
+      return;
    if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
       png_read_start_row(png_ptr);
    else
@@ -552,8 +559,9 @@ png_read_update_info(png_structp png_ptr, png_infop info_ptr)
 void PNGAPI
 png_start_read_image(png_structp png_ptr)
 {
-   png_debug(1, "in png_start_read_image\n");
-   if (png_ptr == NULL) return;
+   png_debug(1, "in png_start_read_image");
+   if (png_ptr == NULL)
+      return;
    if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
       png_read_start_row(png_ptr);
 }
@@ -570,14 +578,15 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
    PNG_CONST int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
 #endif
    int ret;
-   if (png_ptr == NULL) return;
-   png_debug2(1, "in png_read_row (row %lu, pass %d)\n",
+   if (png_ptr == NULL)
+      return;
+   png_debug2(1, "in png_read_row (row %lu, pass %d)",
       png_ptr->row_number, png_ptr->pass);
    if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
       png_read_start_row(png_ptr);
    if (png_ptr->row_number == 0 && png_ptr->pass == 0)
    {
-   /* check for transforms that have been set but were defined out */
+   /* Check for transforms that have been set but were defined out */
 #if defined(PNG_WRITE_INVERT_SUPPORTED) && !defined(PNG_READ_INVERT_SUPPORTED)
    if (png_ptr->transformations & PNG_INVERT_MONO)
       png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined.");
@@ -609,7 +618,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
    }
 
 #if defined(PNG_READ_INTERLACING_SUPPORTED)
-   /* if interlaced and we do not need a new row, combine row and return */
+   /* If interlaced and we do not need a new row, combine row and return */
    if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
    {
       switch (png_ptr->pass)
@@ -756,15 +765,15 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
       png_do_read_transformations(png_ptr);
 
 #if defined(PNG_READ_INTERLACING_SUPPORTED)
-   /* blow up interlaced rows to full size */
+   /* Blow up interlaced rows to full size */
    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);
- */
+         /* 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)
@@ -822,8 +831,9 @@ png_read_rows(png_structp png_ptr, png_bytepp row,
    png_bytepp rp;
    png_bytepp dp;
 
-   png_debug(1, "in png_read_rows\n");
-   if (png_ptr == NULL) return;
+   png_debug(1, "in png_read_rows");
+   if (png_ptr == NULL)
+      return;
    rp = row;
    dp = display_row;
    if (rp != NULL && dp != NULL)
@@ -871,8 +881,9 @@ png_read_image(png_structp png_ptr, png_bytepp image)
    int pass, j;
    png_bytepp rp;
 
-   png_debug(1, "in png_read_image\n");
-   if (png_ptr == NULL) return;
+   png_debug(1, "in png_read_image");
+   if (png_ptr == NULL)
+      return;
 
 #ifdef PNG_READ_INTERLACING_SUPPORTED
    pass = png_set_interlace_handling(png_ptr);
@@ -907,8 +918,9 @@ png_read_image(png_structp png_ptr, png_bytepp image)
 void PNGAPI
 png_read_end(png_structp png_ptr, png_infop info_ptr)
 {
-   png_debug(1, "in png_read_end\n");
-   if (png_ptr == NULL) return;
+   png_debug(1, "in png_read_end");
+   if (png_ptr == NULL)
+      return;
    png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */
 
    do
@@ -1075,7 +1087,7 @@ png_read_end(png_structp png_ptr, png_infop info_ptr)
 }
 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
 
-/* free all memory used by the read */
+/* Free all memory used by the read */
 void PNGAPI
 png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
    png_infopp end_info_ptr_ptr)
@@ -1087,7 +1099,7 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
    png_voidp mem_ptr = NULL;
 #endif
 
-   png_debug(1, "in png_destroy_read_struct\n");
+   png_debug(1, "in png_destroy_read_struct");
    if (png_ptr_ptr != NULL)
       png_ptr = *png_ptr_ptr;
    if (png_ptr == NULL)
@@ -1147,7 +1159,7 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
    }
 }
 
-/* free all memory used by the read (old method) */
+/* Free all memory used by the read (old method) */
 void /* PRIVATE */
 png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr)
 {
@@ -1161,7 +1173,7 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
    png_free_ptr free_fn;
 #endif
 
-   png_debug(1, "in png_read_destroy\n");
+   png_debug(1, "in png_read_destroy");
    if (info_ptr != NULL)
       png_info_destroy(png_ptr, info_ptr);
 
@@ -1296,7 +1308,8 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
 void PNGAPI
 png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn)
 {
-   if (png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
    png_ptr->read_row_fn = read_row_fn;
 }
 
@@ -1310,9 +1323,10 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
 {
    int row;
 
-   if (png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
-   /* invert the alpha channel from opacity to transparency
+   /* Invert the alpha channel from opacity to transparency
     */
    if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
        png_set_invert_alpha(png_ptr);
@@ -1328,10 +1342,10 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
    /* -------------- image transformations start here ------------------- */
 
 #if defined(PNG_READ_16_TO_8_SUPPORTED)
-   /* tell libpng to strip 16 bit/color files down to 8 bits per color
+   /* Tell libpng to strip 16 bit/color files down to 8 bits per color.
     */
    if (transforms & PNG_TRANSFORM_STRIP_16)
-       png_set_strip_16(png_ptr);
+      png_set_strip_16(png_ptr);
 #endif
 
 #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
@@ -1339,7 +1353,7 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
     * the background (not recommended).
     */
    if (transforms & PNG_TRANSFORM_STRIP_ALPHA)
-       png_set_strip_alpha(png_ptr);
+      png_set_strip_alpha(png_ptr);
 #endif
 
 #if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED)
@@ -1347,7 +1361,7 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
     * byte into separate bytes (useful for paletted and grayscale images).
     */
    if (transforms & PNG_TRANSFORM_PACKING)
-       png_set_packing(png_ptr);
+      png_set_packing(png_ptr);
 #endif
 
 #if defined(PNG_READ_PACKSWAP_SUPPORTED)
@@ -1355,7 +1369,7 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
     * (not useful if you are using png_set_packing).
     */
    if (transforms & PNG_TRANSFORM_PACKSWAP)
-       png_set_packswap(png_ptr);
+      png_set_packswap(png_ptr);
 #endif
 
 #if defined(PNG_READ_EXPAND_SUPPORTED)
@@ -1365,9 +1379,9 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
     * channels so the data will be available as RGBA quartets.
     */
    if (transforms & PNG_TRANSFORM_EXPAND)
-       if ((png_ptr->bit_depth < 8) ||
-           (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ||
-           (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))
+      if ((png_ptr->bit_depth < 8) ||
+          (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ||
+          (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))
          png_set_expand(png_ptr);
 #endif
 
@@ -1375,10 +1389,10 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
     */
 
 #if defined(PNG_READ_INVERT_SUPPORTED)
-   /* invert monochrome files to have 0 as white and 1 as black
+   /* Invert monochrome files to have 0 as white and 1 as black
     */
    if (transforms & PNG_TRANSFORM_INVERT_MONO)
-       png_set_invert_mono(png_ptr);
+      png_set_invert_mono(png_ptr);
 #endif
 
 #if defined(PNG_READ_SHIFT_SUPPORTED)
@@ -1397,24 +1411,24 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
 #endif
 
 #if defined(PNG_READ_BGR_SUPPORTED)
-   /* flip the RGB pixels to BGR (or RGBA to BGRA)
+   /* Flip the RGB pixels to BGR (or RGBA to BGRA)
     */
    if (transforms & PNG_TRANSFORM_BGR)
-       png_set_bgr(png_ptr);
+      png_set_bgr(png_ptr);
 #endif
 
 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
-   /* swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR)
+   /* Swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR)
     */
    if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
        png_set_swap_alpha(png_ptr);
 #endif
 
 #if defined(PNG_READ_SWAP_SUPPORTED)
-   /* swap bytes of 16 bit files to least significant byte first
+   /* Swap bytes of 16 bit files to least significant byte first
     */
    if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
-       png_set_swap(png_ptr);
+      png_set_swap(png_ptr);
 #endif
 
    /* We don't handle adding filler bytes */
@@ -1434,23 +1448,23 @@ png_read_png(png_structp png_ptr, png_infop info_ptr,
    {
       info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr,
          info_ptr->height * png_sizeof(png_bytep));
+      png_memset(info_ptr->row_pointers, 0, info_ptr->height
+         * png_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_bytep)png_malloc(png_ptr,
             png_get_rowbytes(png_ptr, info_ptr));
-      }
    }
 
    png_read_image(png_ptr, info_ptr->row_pointers);
    info_ptr->valid |= PNG_INFO_IDAT;
 
-   /* read rest of file, and get additional chunks in info_ptr - REQUIRED */
+   /* Read rest of file, and get additional chunks in info_ptr - REQUIRED */
    png_read_end(png_ptr, info_ptr);
 
-   transforms = transforms; /* quiet compiler warnings */
+   transforms = transforms; /* Quiet compiler warnings */
    params = params;
 
 }

pngrio.c

@@ -1,12 +1,15 @@
 
 /* pngrio.c - functions for data input
  *
- * Last changed in libpng 1.2.30 [August 15, 2008]
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2008 Glenn Randers-Pehrson
+ * Last changed in libpng 1.2.37 [June 4, 2009]
+ * Copyright (c) 1998-2009 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 code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
  * This file provides a location for all input.  Users who need
  * special handling are expected to write a function that has the same
  * arguments as this and performs a similar function, but that possibly
@@ -20,14 +23,15 @@
 #if defined(PNG_READ_SUPPORTED)
 
 /* Read the data from whatever input you are using.  The default routine
-   reads from a file pointer.  Note that this routine sometimes gets called
-   with very small lengths, so you should implement some kind of simple
-   buffering if you are using unbuffered reads.  This should never be asked
-   to read more then 64K on a 16 bit machine. */
+ * reads from a file pointer.  Note that this routine sometimes gets called
+ * with very small lengths, so you should implement some kind of simple
+ * buffering if you are using unbuffered reads.  This should never be asked
+ * to read more then 64K on a 16 bit machine.
+ */
 void /* PRIVATE */
 png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
-   png_debug1(4, "reading %d bytes\n", (int)length);
+   png_debug1(4, "reading %d bytes", (int)length);
    if (png_ptr->read_data_fn != NULL)
       (*(png_ptr->read_data_fn))(png_ptr, data, length);
    else
@@ -36,16 +40,18 @@ png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 
 #if !defined(PNG_NO_STDIO)
 /* This is the function that does the actual reading of data.  If you are
-   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. */
+ * 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
 void PNGAPI
 png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    png_size_t check;
 
-   if (png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
    /* fread() returns 0 on error, so it is OK to store this in a png_size_t
     * instead of an int, which is what fread() actually returns.
     */
@@ -61,7 +67,7 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
       png_error(png_ptr, "Read Error");
 }
 #else
-/* this is the model-independent version. Since the standard I/O library
+/* This is the model-independent version. Since the standard I/O library
    can't handle far buffers in the medium and small models, we have to copy
    the data.
 */
@@ -76,7 +82,8 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
    png_byte *n_data;
    png_FILE_p io_ptr;
 
-   if (png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
    /* Check if data really is near. If so, use usual code. */
    n_data = (png_byte *)CVT_PTR_NOCHECK(data);
    io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
@@ -121,23 +128,27 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 #endif
 
 /* This function allows the application to supply a new input function
-   for libpng if standard C streams aren't being used.
-
-   This function takes as its arguments:
-   png_ptr      - pointer to a png input data structure
-   io_ptr       - pointer to user supplied structure containing info about
-                  the input functions.  May be NULL.
-   read_data_fn - pointer to a new input function that takes as its
-                  arguments a pointer to a png_struct, a pointer to
-                  a location where input data can be stored, and a 32-bit
-                  unsigned int that is the number of bytes to be read.
-                  To exit and output any fatal error messages the new write
-                  function should call png_error(png_ptr, "Error msg"). */
+ * for libpng if standard C streams aren't being used.
+ *
+ * This function takes as its arguments:
+ * png_ptr      - pointer to a png input data structure
+ * io_ptr       - pointer to user supplied structure containing info about
+ *                the input functions.  May be NULL.
+ * read_data_fn - pointer to a new input function that takes as its
+ *                arguments a pointer to a png_struct, a pointer to
+ *                a location where input data can be stored, and a 32-bit
+ *                unsigned int that is the number of bytes to be read.
+ *                To exit and output any fatal error messages the new write
+ *                function should call png_error(png_ptr, "Error msg").
+ *                May be NULL, in which case libpng's default function will
+ *                be used.
+ */
 void PNGAPI
 png_set_read_fn(png_structp png_ptr, png_voidp io_ptr,
    png_rw_ptr read_data_fn)
 {
-   if (png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
    png_ptr->io_ptr = io_ptr;
 
 #if !defined(PNG_NO_STDIO)

pngrutil.c

@@ -1,12 +1,15 @@
 
 /* pngrutil.c - utilities to read a PNG file
  *
- * Last changed in libpng 1.2.33 [October 31, 2008]
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2008 Glenn Randers-Pehrson
+ * Last changed in libpng 1.2.38 [July 16, 2009]
+ * Copyright (c) 1998-2009 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 code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
  * This file contains routines that are only called from within
  * libpng itself during the course of reading an image.
  */
@@ -21,7 +24,7 @@
 
 #ifdef PNG_FLOATING_POINT_SUPPORTED
 #  if defined(WIN32_WCE_OLD)
-/* strtod() function is not supported on WindowsCE */
+/* The strtod() function is not supported on WindowsCE */
 __inline double png_strtod(png_structp png_ptr, PNG_CONST char *nptr, char **endptr)
 {
    double result = 0;
@@ -76,7 +79,8 @@ png_get_uint_32(png_bytep buf)
 
 /* Grab a signed 32-bit integer from a buffer in big-endian format.  The
  * data is stored in the PNG file in two's complement format, and it is
- * assumed that the machine format for signed integers is the same. */
+ * assumed that the machine format for signed integers is the same.
+ */
 png_int_32 PNGAPI
 png_get_int_32(png_bytep buf)
 {
@@ -108,21 +112,21 @@ png_read_chunk_header(png_structp png_ptr)
    png_byte buf[8];
    png_uint_32 length;
 
-   /* read the length and the chunk name */
+   /* Read the length and the chunk name */
    png_read_data(png_ptr, buf, 8);
    length = png_get_uint_31(png_ptr, buf);
 
-   /* put the chunk name into png_ptr->chunk_name */
+   /* Put the chunk name into png_ptr->chunk_name */
    png_memcpy(png_ptr->chunk_name, buf + 4, 4);
 
-   png_debug2(0, "Reading %s chunk, length = %lu\n",
+   png_debug2(0, "Reading %s chunk, length = %lu",
       png_ptr->chunk_name, length);
 
-   /* reset the crc and run it over the chunk name */
+   /* Reset the crc and run it over the chunk name */
    png_reset_crc(png_ptr);
    png_calculate_crc(png_ptr, png_ptr->chunk_name, 4);
 
-   /* check to see if chunk name is valid */
+   /* Check to see if chunk name is valid */
    png_check_chunk_name(png_ptr, png_ptr->chunk_name);
 
    return length;
@@ -132,15 +136,17 @@ png_read_chunk_header(png_structp png_ptr)
 void /* PRIVATE */
 png_crc_read(png_structp png_ptr, png_bytep buf, png_size_t length)
 {
-   if (png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
    png_read_data(png_ptr, buf, length);
    png_calculate_crc(png_ptr, buf, length);
 }
 
 /* Optionally skip data and then check the CRC.  Depending on whether we
-   are reading a ancillary or critical chunk, and how the program has set
-   things up, we may calculate the CRC on the data and print a message.
-   Returns '1' if there was a CRC error, '0' otherwise. */
+ * are reading a ancillary or critical chunk, and how the program has set
+ * things up, we may calculate the CRC on the data and print a message.
+ * Returns '1' if there was a CRC error, '0' otherwise.
+ */
 int /* PRIVATE */
 png_crc_finish(png_structp png_ptr, png_uint_32 skip)
 {
@@ -159,7 +165,7 @@ png_crc_finish(png_structp png_ptr, png_uint_32 skip)
    if (png_crc_error(png_ptr))
    {
       if (((png_ptr->chunk_name[0] & 0x20) &&                /* Ancillary */
-           !(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN)) ||
+          !(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN)) ||
           (!(png_ptr->chunk_name[0] & 0x20) &&             /* Critical  */
           (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_USE)))
       {
@@ -176,7 +182,8 @@ png_crc_finish(png_structp png_ptr, png_uint_32 skip)
 }
 
 /* Compare the CRC stored in the PNG file with that calculated by libpng from
-   the data it has read thus far. */
+ * the data it has read thus far.
+ */
 int /* PRIVATE */
 png_crc_error(png_structp png_ptr)
 {
@@ -331,14 +338,17 @@ png_decompress_chunk(png_structp png_ptr, int comp_type,
             png_snprintf(umsg, 52,
                 "Buffer error in compressed datastream in %s chunk",
                 png_ptr->chunk_name);
+
          else if (ret == Z_DATA_ERROR)
             png_snprintf(umsg, 52,
                 "Data error in compressed datastream in %s chunk",
                 png_ptr->chunk_name);
+
          else
             png_snprintf(umsg, 52,
                 "Incomplete compressed datastream in %s chunk",
                 png_ptr->chunk_name);
+
          png_warning(png_ptr, umsg);
 #else
          png_warning(png_ptr,
@@ -383,7 +393,7 @@ png_decompress_chunk(png_structp png_ptr, int comp_type,
 }
 #endif
 
-/* read and check the IDHR chunk */
+/* Read and check the IDHR chunk */
 void /* PRIVATE */
 png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 {
@@ -392,12 +402,12 @@ png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    int bit_depth, color_type, compression_type, filter_type;
    int interlace_type;
 
-   png_debug(1, "in png_handle_IHDR\n");
+   png_debug(1, "in png_handle_IHDR");
 
    if (png_ptr->mode & PNG_HAVE_IHDR)
       png_error(png_ptr, "Out of place IHDR");
 
-   /* check the length */
+   /* Check the length */
    if (length != 13)
       png_error(png_ptr, "Invalid IHDR chunk");
 
@@ -414,7 +424,7 @@ png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    filter_type = buf[11];
    interlace_type = buf[12];
 
-   /* set internal variables */
+   /* Set internal variables */
    png_ptr->width = width;
    png_ptr->height = height;
    png_ptr->bit_depth = (png_byte)bit_depth;
@@ -425,36 +435,39 @@ png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 #endif
    png_ptr->compression_type = (png_byte)compression_type;
 
-   /* find number of channels */
+   /* Find number of channels */
    switch (png_ptr->color_type)
    {
       case PNG_COLOR_TYPE_GRAY:
       case PNG_COLOR_TYPE_PALETTE:
          png_ptr->channels = 1;
          break;
+
       case PNG_COLOR_TYPE_RGB:
          png_ptr->channels = 3;
          break;
+
       case PNG_COLOR_TYPE_GRAY_ALPHA:
          png_ptr->channels = 2;
          break;
+
       case PNG_COLOR_TYPE_RGB_ALPHA:
          png_ptr->channels = 4;
          break;
    }
 
-   /* set up other useful info */
+   /* Set up other useful info */
    png_ptr->pixel_depth = (png_byte)(png_ptr->bit_depth *
    png_ptr->channels);
    png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->width);
-   png_debug1(3, "bit_depth = %d\n", png_ptr->bit_depth);
-   png_debug1(3, "channels = %d\n", png_ptr->channels);
-   png_debug1(3, "rowbytes = %lu\n", png_ptr->rowbytes);
+   png_debug1(3, "bit_depth = %d", png_ptr->bit_depth);
+   png_debug1(3, "channels = %d", png_ptr->channels);
+   png_debug1(3, "rowbytes = %lu", png_ptr->rowbytes);
    png_set_IHDR(png_ptr, info_ptr, width, height, bit_depth,
       color_type, interlace_type, compression_type, filter_type);
 }
 
-/* read and check the palette */
+/* Read and check the palette */
 void /* PRIVATE */
 png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 {
@@ -464,16 +477,18 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    png_colorp pal_ptr;
 #endif
 
-   png_debug(1, "in png_handle_PLTE\n");
+   png_debug(1, "in png_handle_PLTE");
 
    if (!(png_ptr->mode & PNG_HAVE_IHDR))
       png_error(png_ptr, "Missing IHDR before PLTE");
+
    else if (png_ptr->mode & PNG_HAVE_IDAT)
    {
       png_warning(png_ptr, "Invalid PLTE after IDAT");
       png_crc_finish(png_ptr, length);
       return;
    }
+
    else if (png_ptr->mode & PNG_HAVE_PLTE)
       png_error(png_ptr, "Duplicate PLTE chunk");
 
@@ -502,6 +517,7 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
          png_crc_finish(png_ptr, length);
          return;
       }
+
       else
       {
          png_error(png_ptr, "Invalid palette chunk");
@@ -526,7 +542,7 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
       png_byte buf[3];
 
       png_crc_read(png_ptr, buf, 3);
-      /* don't depend upon png_color being any order */
+      /* Don't depend upon png_color being any order */
       palette[i].red = buf[0];
       palette[i].green = buf[1];
       palette[i].blue = buf[2];
@@ -534,9 +550,10 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 #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
-      have an RGB image, the PLTE can be considered ancillary, so
-      we will act as though it is. */
+    * whatever the normal CRC configuration tells us.  However, if we
+    * have an RGB image, the PLTE can be considered ancillary, so
+    * we will act as though it is.
+    */
 #if !defined(PNG_READ_OPT_PLTE_SUPPORTED)
    if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
 #endif
@@ -596,7 +613,7 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 void /* PRIVATE */
 png_handle_IEND(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 {
-   png_debug(1, "in png_handle_IEND\n");
+   png_debug(1, "in png_handle_IEND");
 
    if (!(png_ptr->mode & PNG_HAVE_IHDR) || !(png_ptr->mode & PNG_HAVE_IDAT))
    {
@@ -611,7 +628,7 @@ png_handle_IEND(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    }
    png_crc_finish(png_ptr, length);
 
-   info_ptr = info_ptr; /* quiet compiler warnings about unused info_ptr */
+   info_ptr = info_ptr; /* Quiet compiler warnings about unused info_ptr */
 }
 
 #if defined(PNG_READ_gAMA_SUPPORTED)
@@ -624,7 +641,7 @@ png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 #endif
    png_byte buf[4];
 
-   png_debug(1, "in png_handle_gAMA\n");
+   png_debug(1, "in png_handle_gAMA");
 
    if (!(png_ptr->mode & PNG_HAVE_IHDR))
       png_error(png_ptr, "Missing IHDR before gAMA");
@@ -661,7 +678,7 @@ png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
       return;
 
    igamma = (png_fixed_point)png_get_uint_32(buf);
-   /* check for zero gamma */
+   /* Check for zero gamma */
    if (igamma == 0)
       {
          png_warning(png_ptr,
@@ -676,7 +693,7 @@ 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_CONSOLE_IO
-         fprintf(stderr, "gamma = (%d/100000)\n", (int)igamma);
+         fprintf(stderr, "gamma = (%d/100000)", (int)igamma);
 #endif
          return;
       }
@@ -702,7 +719,7 @@ png_handle_sBIT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    png_size_t truelen;
    png_byte buf[4];
 
-   png_debug(1, "in png_handle_sBIT\n");
+   png_debug(1, "in png_handle_sBIT");
 
    buf[0] = buf[1] = buf[2] = buf[3] = 0;
 
@@ -774,7 +791,7 @@ png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 
    png_uint_32 uint_x, uint_y;
 
-   png_debug(1, "in png_handle_cHRM\n");
+   png_debug(1, "in png_handle_cHRM");
 
    if (!(png_ptr->mode & PNG_HAVE_IHDR))
       png_error(png_ptr, "Missing IHDR before cHRM");
@@ -812,42 +829,21 @@ png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 
    uint_x = png_get_uint_32(buf);
    uint_y = png_get_uint_32(buf + 4);
-   if (uint_x > 80000L || uint_y > 80000L ||
-      uint_x + uint_y > 100000L)
-   {
-      png_warning(png_ptr, "Invalid cHRM white point");
-      return;
-   }
    int_x_white = (png_fixed_point)uint_x;
    int_y_white = (png_fixed_point)uint_y;
 
    uint_x = png_get_uint_32(buf + 8);
    uint_y = png_get_uint_32(buf + 12);
-   if (uint_x + uint_y > 100000L)
-   {
-      png_warning(png_ptr, "Invalid cHRM red point");
-      return;
-   }
    int_x_red = (png_fixed_point)uint_x;
    int_y_red = (png_fixed_point)uint_y;
 
    uint_x = png_get_uint_32(buf + 16);
    uint_y = png_get_uint_32(buf + 20);
-   if (uint_x + uint_y > 100000L)
-   {
-      png_warning(png_ptr, "Invalid cHRM green point");
-      return;
-   }
    int_x_green = (png_fixed_point)uint_x;
    int_y_green = (png_fixed_point)uint_y;
 
    uint_x = png_get_uint_32(buf + 24);
    uint_y = png_get_uint_32(buf + 28);
-   if (uint_x + uint_y > 100000L)
-   {
-      png_warning(png_ptr, "Invalid cHRM blue point");
-      return;
-   }
    int_x_blue = (png_fixed_point)uint_x;
    int_y_blue = (png_fixed_point)uint_y;
 
@@ -913,7 +909,7 @@ png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    int intent;
    png_byte buf[1];
 
-   png_debug(1, "in png_handle_sRGB\n");
+   png_debug(1, "in png_handle_sRGB");
 
    if (!(png_ptr->mode & PNG_HAVE_IHDR))
       png_error(png_ptr, "Missing IHDR before sRGB");
@@ -946,7 +942,7 @@ png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
       return;
 
    intent = buf[0];
-   /* check for bad intent */
+   /* Check for bad intent */
    if (intent >= PNG_sRGB_INTENT_LAST)
    {
       png_warning(png_ptr, "Unknown sRGB intent");
@@ -1016,7 +1012,7 @@ png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    png_uint_32 profile_size, profile_length;
    png_size_t slength, prefix_length, data_length;
 
-   png_debug(1, "in png_handle_iCCP\n");
+   png_debug(1, "in png_handle_iCCP");
 
    if (!(png_ptr->mode & PNG_HAVE_IHDR))
       png_error(png_ptr, "Missing IHDR before iCCP");
@@ -1061,12 +1057,13 @@ png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    png_ptr->chunkdata[slength] = 0x00;
 
    for (profile = png_ptr->chunkdata; *profile; profile++)
-      /* empty loop to find end of name */ ;
+      /* Empty loop to find end of name */ ;
 
    ++profile;
 
-   /* there should be at least one zero (the compression type byte)
-      following the separator, and we should be on it  */
+   /* There should be at least one zero (the compression type byte)
+    * following the separator, and we should be on it
+    */
    if ( profile >= png_ptr->chunkdata + slength - 1)
    {
       png_free(png_ptr, png_ptr->chunkdata);
@@ -1075,7 +1072,7 @@ png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
       return;
    }
 
-   /* compression_type should always be zero */
+   /* Compression_type should always be zero */
    compression_type = *profile++;
    if (compression_type)
    {
@@ -1137,7 +1134,8 @@ png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    png_uint_32 skip = 0;
    png_size_t slength;
 
-   png_debug(1, "in png_handle_sPLT\n");
+   png_debug(1, "in png_handle_sPLT");
+
 
    if (!(png_ptr->mode & PNG_HAVE_IHDR))
       png_error(png_ptr, "Missing IHDR before sPLT");
@@ -1172,10 +1170,10 @@ png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    png_ptr->chunkdata[slength] = 0x00;
 
    for (entry_start = (png_bytep)png_ptr->chunkdata; *entry_start; entry_start++)
-      /* empty loop to find end of name */ ;
+      /* Empty loop to find end of name */ ;
    ++entry_start;
 
-   /* a sample depth should follow the separator, and we should be on it  */
+   /* A sample depth should follow the separator, and we should be on it  */
    if (entry_start > (png_bytep)png_ptr->chunkdata + slength - 2)
    {
       png_free(png_ptr, png_ptr->chunkdata);
@@ -1188,7 +1186,7 @@ png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    entry_size = (new_palette.depth == 8 ? 6 : 10);
    data_length = (slength - (entry_start - (png_bytep)png_ptr->chunkdata));
 
-   /* integrity-check the data length */
+   /* Integrity-check the data length */
    if (data_length % entry_size)
    {
       png_free(png_ptr, png_ptr->chunkdata);
@@ -1256,7 +1254,7 @@ png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    }
 #endif
 
-   /* discard all chunk data except the name and stash that */
+   /* Discard all chunk data except the name and stash that */
    new_palette.name = png_ptr->chunkdata;
 
    png_set_sPLT(png_ptr, info_ptr, &new_palette, 1);
@@ -1273,7 +1271,7 @@ 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");
+   png_debug(1, "in png_handle_tRNS");
 
    if (!(png_ptr->mode & PNG_HAVE_IHDR))
       png_error(png_ptr, "Missing IHDR before tRNS");
@@ -1369,7 +1367,7 @@ png_handle_bKGD(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    png_size_t truelen;
    png_byte buf[6];
 
-   png_debug(1, "in png_handle_bKGD\n");
+   png_debug(1, "in png_handle_bKGD");
 
    if (!(png_ptr->mode & PNG_HAVE_IHDR))
       png_error(png_ptr, "Missing IHDR before bKGD");
@@ -1420,7 +1418,7 @@ png_handle_bKGD(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
       png_ptr->background.index = buf[0];
       if (info_ptr && info_ptr->num_palette)
       {
-          if (buf[0] > info_ptr->num_palette)
+          if (buf[0] >= info_ptr->num_palette)
           {
              png_warning(png_ptr, "Incorrect bKGD chunk index value");
              return;
@@ -1458,7 +1456,7 @@ png_handle_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    unsigned int num, i;
    png_uint_16 readbuf[PNG_MAX_PALETTE_LENGTH];
 
-   png_debug(1, "in png_handle_hIST\n");
+   png_debug(1, "in png_handle_hIST");
 
    if (!(png_ptr->mode & PNG_HAVE_IHDR))
       png_error(png_ptr, "Missing IHDR before hIST");
@@ -1513,7 +1511,7 @@ png_handle_pHYs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    png_uint_32 res_x, res_y;
    int unit_type;
 
-   png_debug(1, "in png_handle_pHYs\n");
+   png_debug(1, "in png_handle_pHYs");
 
    if (!(png_ptr->mode & PNG_HAVE_IHDR))
       png_error(png_ptr, "Missing IHDR before pHYs");
@@ -1556,7 +1554,7 @@ png_handle_oFFs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    png_int_32 offset_x, offset_y;
    int unit_type;
 
-   png_debug(1, "in png_handle_oFFs\n");
+   png_debug(1, "in png_handle_oFFs");
 
    if (!(png_ptr->mode & PNG_HAVE_IHDR))
       png_error(png_ptr, "Missing IHDR before oFFs");
@@ -1592,7 +1590,7 @@ 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 (described in the PNG Extensions document) */
+/* 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)
 {
@@ -1603,7 +1601,7 @@ png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    png_size_t slength;
    int i;
 
-   png_debug(1, "in png_handle_pCAL\n");
+   png_debug(1, "in png_handle_pCAL");
 
    if (!(png_ptr->mode & PNG_HAVE_IHDR))
       png_error(png_ptr, "Missing IHDR before pCAL");
@@ -1620,7 +1618,7 @@ 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 (%lu bytes)\n",
+   png_debug1(2, "Allocating and reading pCAL chunk data (%lu bytes)",
       length + 1);
    png_free(png_ptr, png_ptr->chunkdata);
    png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1);
@@ -1639,11 +1637,11 @@ png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
       return;
    }
 
-   png_ptr->chunkdata[slength] = 0x00; /* null terminate the last string */
+   png_ptr->chunkdata[slength] = 0x00; /* Null terminate the last string */
 
-   png_debug(3, "Finding end of pCAL purpose string\n");
+   png_debug(3, "Finding end of pCAL purpose string");
    for (buf = png_ptr->chunkdata; *buf; buf++)
-      /* empty loop */ ;
+      /* Empty loop */ ;
 
    endptr = png_ptr->chunkdata + slength;
 
@@ -1657,14 +1655,14 @@ png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
       return;
    }
 
-   png_debug(3, "Reading pCAL X0, X1, type, nparams, and units\n");
+   png_debug(3, "Reading pCAL X0, X1, type, nparams, and units");
    X0 = png_get_int_32((png_bytep)buf+1);
    X1 = png_get_int_32((png_bytep)buf+5);
    type = buf[9];
    nparams = buf[10];
    units = buf + 11;
 
-   png_debug(3, "Checking pCAL equation type and number of parameters\n");
+   png_debug(3, "Checking pCAL equation type and number of parameters");
    /* Check that we have the right number of parameters for known
       equation types. */
    if ((type == PNG_EQUATION_LINEAR && nparams != 2) ||
@@ -1685,7 +1683,7 @@ png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    for (buf = units; *buf; buf++)
       /* Empty loop to move past the units string. */ ;
 
-   png_debug(3, "Allocating pCAL parameters array\n");
+   png_debug(3, "Allocating pCAL parameters array");
    params = (png_charpp)png_malloc_warn(png_ptr,
       (png_uint_32)(nparams * png_sizeof(png_charp))) ;
    if (params == NULL)
@@ -1701,7 +1699,7 @@ png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    {
       buf++; /* Skip the null string terminator from previous parameter. */
 
-      png_debug1(3, "Reading pCAL parameter %d\n", i);
+      png_debug1(3, "Reading pCAL parameter %d", i);
       for (params[i] = buf; buf <= endptr && *buf != 0x00; buf++)
          /* Empty loop to move past each parameter string */ ;
 
@@ -1726,7 +1724,7 @@ png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 #endif
 
 #if defined(PNG_READ_sCAL_SUPPORTED)
-/* read the sCAL chunk */
+/* Read the sCAL chunk */
 void /* PRIVATE */
 png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 {
@@ -1741,7 +1739,7 @@ png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 #endif
    png_size_t slength;
 
-   png_debug(1, "in png_handle_sCAL\n");
+   png_debug(1, "in png_handle_sCAL");
 
    if (!(png_ptr->mode & PNG_HAVE_IHDR))
       png_error(png_ptr, "Missing IHDR before sCAL");
@@ -1758,7 +1756,7 @@ 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 (%lu bytes)\n",
+   png_debug1(2, "Allocating and reading sCAL chunk data (%lu bytes)",
       length + 1);
    png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1);
    if (png_ptr->chunkdata == NULL)
@@ -1776,9 +1774,9 @@ png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
       return;
    }
 
-   png_ptr->chunkdata[slength] = 0x00; /* null terminate the last string */
+   png_ptr->chunkdata[slength] = 0x00; /* Null terminate the last string */
 
-   ep = png_ptr->chunkdata + 1;        /* skip unit byte */
+   ep = png_ptr->chunkdata + 1;        /* Skip unit byte */
 
 #ifdef PNG_FLOATING_POINT_SUPPORTED
    width = png_strtod(png_ptr, ep, &vp);
@@ -1800,7 +1798,7 @@ png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 #endif
 
    for (ep = png_ptr->chunkdata; *ep; ep++)
-      /* empty loop */ ;
+      /* Empty loop */ ;
    ep++;
 
    if (png_ptr->chunkdata + slength < ep)
@@ -1875,7 +1873,7 @@ png_handle_tIME(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    png_byte buf[7];
    png_time mod_time;
 
-   png_debug(1, "in png_handle_tIME\n");
+   png_debug(1, "in png_handle_tIME");
 
    if (!(png_ptr->mode & PNG_HAVE_IHDR))
       png_error(png_ptr, "Out of place tIME chunk");
@@ -1923,7 +1921,8 @@ png_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    png_size_t slength;
    int ret;
 
-   png_debug(1, "in png_handle_tEXt\n");
+   png_debug(1, "in png_handle_tEXt");
+
 
    if (!(png_ptr->mode & PNG_HAVE_IHDR))
       png_error(png_ptr, "Missing IHDR before tEXt");
@@ -1941,6 +1940,7 @@ png_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 #endif
 
    png_free(png_ptr, png_ptr->chunkdata);
+
    png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1);
    if (png_ptr->chunkdata == NULL)
    {
@@ -1958,10 +1958,11 @@ png_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    }
 
    key = png_ptr->chunkdata;
+
    key[slength] = 0x00;
 
    for (text = key; *text; text++)
-      /* empty loop to find end of key */ ;
+      /* Empty loop to find end of key */ ;
 
    if (text != key + slength)
       text++;
@@ -1996,7 +1997,7 @@ png_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 #endif
 
 #if defined(PNG_READ_zTXt_SUPPORTED)
-/* note: this does not correctly handle chunks that are > 64K under DOS */
+/* Note: this does not correctly handle chunks that are > 64K under DOS */
 void /* PRIVATE */
 png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 {
@@ -2006,7 +2007,9 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    int ret;
    png_size_t slength, prefix_len, data_len;
 
-   png_debug(1, "in png_handle_zTXt\n");
+   png_debug(1, "in png_handle_zTXt");
+
+
    if (!(png_ptr->mode & PNG_HAVE_IHDR))
       png_error(png_ptr, "Missing IHDR before zTXt");
 
@@ -2043,7 +2046,7 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    png_ptr->chunkdata[slength] = 0x00;
 
    for (text = png_ptr->chunkdata; *text; text++)
-      /* empty loop */ ;
+      /* Empty loop */ ;
 
    /* zTXt must have some text after the chunkdataword */
    if (text >= png_ptr->chunkdata + slength - 2)
@@ -2061,7 +2064,7 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
           png_warning(png_ptr, "Unknown compression type in zTXt chunk");
           comp_type = PNG_TEXT_COMPRESSION_zTXt;
        }
-       text++;        /* skip the compression_method byte */
+       text++;        /* Skip the compression_method byte */
    }
    prefix_len = text - png_ptr->chunkdata;
 
@@ -2098,7 +2101,7 @@ png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 #endif
 
 #if defined(PNG_READ_iTXt_SUPPORTED)
-/* note: this does not correctly handle chunks that are > 64K under DOS */
+/* Note: this does not correctly handle chunks that are > 64K under DOS */
 void /* PRIVATE */
 png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 {
@@ -2109,7 +2112,8 @@ png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    int ret;
    png_size_t slength, prefix_len, data_len;
 
-   png_debug(1, "in png_handle_iTXt\n");
+   png_debug(1, "in png_handle_iTXt");
+
 
    if (!(png_ptr->mode & PNG_HAVE_IHDR))
       png_error(png_ptr, "Missing IHDR before iTXt");
@@ -2147,12 +2151,13 @@ png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    png_ptr->chunkdata[slength] = 0x00;
 
    for (lang = png_ptr->chunkdata; *lang; lang++)
-      /* empty loop */ ;
-   lang++;        /* skip NUL separator */
+      /* Empty loop */ ;
+   lang++;        /* Skip NUL separator */
 
    /* iTXt must have a language tag (possibly empty), two compression bytes,
-      translated keyword (possibly empty), and possibly some text after the
-      keyword */
+    * translated keyword (possibly empty), and possibly some text after the
+    * keyword
+    */
 
    if (lang >= png_ptr->chunkdata + slength - 3)
    {
@@ -2168,8 +2173,8 @@ png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    }
 
    for (lang_key = lang; *lang_key; lang_key++)
-      /* empty loop */ ;
-   lang_key++;        /* skip NUL separator */
+      /* Empty loop */ ;
+   lang_key++;        /* Skip NUL separator */
 
    if (lang_key >= png_ptr->chunkdata + slength)
    {
@@ -2180,8 +2185,8 @@ png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    }
 
    for (text = lang_key; *text; text++)
-      /* empty loop */ ;
-   text++;        /* skip NUL separator */
+      /* Empty loop */ ;
+   text++;        /* Skip NUL separator */
    if (text >= png_ptr->chunkdata + slength)
    {
       png_warning(png_ptr, "Malformed iTXt chunk");
@@ -2235,20 +2240,21 @@ png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 {
    png_uint_32 skip = 0;
 
-   png_debug(1, "in png_handle_unknown\n");
+   png_debug(1, "in png_handle_unknown");
+
 
    if (png_ptr->mode & PNG_HAVE_IDAT)
    {
 #ifdef PNG_USE_LOCAL_ARRAYS
       PNG_CONST PNG_IDAT;
 #endif
-      if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))  /* not an IDAT */
+      if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))  /* Not an IDAT */
          png_ptr->mode |= PNG_AFTER_IDAT;
    }
 
    if (!(png_ptr->chunk_name[0] & 0x20))
    {
-#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
+#if defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
       if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
            PNG_HANDLE_CHUNK_ALWAYS
 #if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
@@ -2260,8 +2266,11 @@ png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
    }
 
 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
-   if ((png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS) ||
-       (png_ptr->read_user_chunk_fn != NULL))
+   if ((png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS)
+#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
+       || (png_ptr->read_user_chunk_fn != NULL)
+#endif
+        )
    {
 #ifdef PNG_MAX_MALLOC_64K
        if (length > (png_uint_32)65535L)
@@ -2272,7 +2281,7 @@ png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
        }
 #endif
        png_memcpy((png_charp)png_ptr->unknown_chunk.name,
-                  (png_charp)png_ptr->chunk_name, 
+                  (png_charp)png_ptr->chunk_name,
                   png_sizeof(png_ptr->unknown_chunk.name));
        png_ptr->unknown_chunk.name[png_sizeof(png_ptr->unknown_chunk.name)-1] = '\0';
        png_ptr->unknown_chunk.size = (png_size_t)length;
@@ -2286,7 +2295,7 @@ png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 #if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
        if (png_ptr->read_user_chunk_fn != NULL)
        {
-          /* callback to user unknown chunk handler */
+          /* Callback to user unknown chunk handler */
           int ret;
           ret = (*(png_ptr->read_user_chunk_fn))
             (png_ptr, &png_ptr->unknown_chunk);
@@ -2295,8 +2304,10 @@ png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
           if (ret == 0)
           {
              if (!(png_ptr->chunk_name[0] & 0x20))
+#if defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
                 if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
                      PNG_HANDLE_CHUNK_ALWAYS)
+#endif
                    png_chunk_error(png_ptr, "unknown critical chunk");
              png_set_unknown_chunks(png_ptr, info_ptr,
                &png_ptr->unknown_chunk, 1);
@@ -2315,7 +2326,7 @@ 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)
-   info_ptr = info_ptr; /* quiet compiler warnings about unused info_ptr */
+   info_ptr = info_ptr; /* Quiet compiler warnings about unused info_ptr */
 #endif
 }
 
@@ -2330,7 +2341,7 @@ png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 void /* PRIVATE */
 png_check_chunk_name(png_structp png_ptr, png_bytep chunk_name)
 {
-   png_debug(1, "in png_check_chunk_name\n");
+   png_debug(1, "in png_check_chunk_name");
    if (isnonalpha(chunk_name[0]) || isnonalpha(chunk_name[1]) ||
        isnonalpha(chunk_name[2]) || isnonalpha(chunk_name[3]))
    {
@@ -2352,7 +2363,7 @@ png_check_chunk_name(png_structp png_ptr, png_bytep chunk_name)
 void /* PRIVATE */
 png_combine_row(png_structp png_ptr, png_bytep row, int mask)
 {
-   png_debug(1, "in png_combine_row\n");
+   png_debug(1, "in png_combine_row");
    if (mask == 0xff)
    {
       png_memcpy(row, png_ptr->row_buf + 1,
@@ -2563,12 +2574,12 @@ png_do_read_interlace(png_structp png_ptr)
    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 */
+   /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+   /* Offset to next interlace block */
    PNG_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");
    if (row != NULL && row_info != NULL)
    {
       png_uint_32 final_width;
@@ -2772,7 +2783,7 @@ png_do_read_interlace(png_structp png_ptr)
       row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, final_width);
    }
 #if !defined(PNG_READ_PACKSWAP_SUPPORTED)
-   transformations = transformations; /* silence compiler warning */
+   transformations = transformations; /* Silence compiler warning */
 #endif
 }
 #endif /* PNG_READ_INTERLACING_SUPPORTED */
@@ -2781,8 +2792,8 @@ void /* PRIVATE */
 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 = %lu, filter = %d\n", png_ptr->row_number, filter);
+   png_debug(1, "in png_read_filter_row");
+   png_debug2(2, "row = %lu, filter = %d", png_ptr->row_number, filter);
    switch (filter)
    {
       case PNG_FILTER_VALUE_NONE:
@@ -2856,7 +2867,7 @@ png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep row,
             rp++;
          }
 
-         for (i = 0; i < istop; i++)   /* use leftover rp,pp */
+         for (i = 0; i < istop; i++)   /* Use leftover rp,pp */
          {
             int a, b, c, pa, pb, pc, p;
 
@@ -2900,28 +2911,29 @@ png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep row,
    }
 }
 
+#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
 void /* PRIVATE */
 png_read_finish_row(png_structp png_ptr)
 {
 #ifdef PNG_USE_LOCAL_ARRAYS
 #ifdef PNG_READ_INTERLACING_SUPPORTED
-   /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+   /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
 
-   /* start of interlace block */
+   /* Start of interlace block */
    PNG_CONST int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
 
-   /* offset to next interlace block */
+   /* Offset to next interlace block */
    PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
 
-   /* start of interlace block in the y direction */
+   /* Start of interlace block in the y direction */
    PNG_CONST int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
 
-   /* offset to next interlace block in the y direction */
+   /* Offset to next interlace block in the y direction */
    PNG_CONST int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
 #endif /* PNG_READ_INTERLACING_SUPPORTED */
 #endif
 
-   png_debug(1, "in png_read_finish_row\n");
+   png_debug(1, "in png_read_finish_row");
    png_ptr->row_number++;
    if (png_ptr->row_number < png_ptr->num_rows)
       return;
@@ -3031,24 +3043,25 @@ png_read_finish_row(png_structp png_ptr)
 
    png_ptr->mode |= PNG_AFTER_IDAT;
 }
+#endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
 
 void /* PRIVATE */
 png_read_start_row(png_structp png_ptr)
 {
 #ifdef PNG_USE_LOCAL_ARRAYS
 #ifdef PNG_READ_INTERLACING_SUPPORTED
-   /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+   /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
 
-   /* start of interlace block */
+   /* Start of interlace block */
    PNG_CONST int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
 
-   /* offset to next interlace block */
+   /* Offset to next interlace block */
    PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
 
-   /* start of interlace block in the y direction */
+   /* Start of interlace block in the y direction */
    PNG_CONST int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
 
-   /* offset to next interlace block in the y direction */
+   /* Offset to next interlace block in the y direction */
    PNG_CONST int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
 #endif
 #endif
@@ -3056,7 +3069,7 @@ png_read_start_row(png_structp png_ptr)
    int max_pixel_depth;
    png_size_t row_bytes;
 
-   png_debug(1, "in png_read_start_row\n");
+   png_debug(1, "in png_read_start_row");
    png_ptr->zstream.avail_in = 0;
    png_init_read_transformations(png_ptr);
 #ifdef PNG_READ_INTERLACING_SUPPORTED
@@ -3185,11 +3198,13 @@ defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
      }
 #endif
 
-   /* align the width on the next larger 8 pixels.  Mainly used
-      for interlacing */
+   /* Align the width on the next larger 8 pixels.  Mainly used
+    * for interlacing
+    */
    row_bytes = ((png_ptr->width + 7) & ~((png_uint_32)7));
-   /* calculate the maximum bytes needed, adding a byte and a pixel
-      for safety's sake */
+   /* Calculate the maximum bytes needed, adding a byte and a pixel
+    * for safety's sake
+    */
    row_bytes = PNG_ROWBYTES(max_pixel_depth, row_bytes) +
       1 + ((max_pixel_depth + 7) >> 3);
 #ifdef PNG_MAX_MALLOC_64K
@@ -3200,34 +3215,37 @@ defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
    if (row_bytes + 64 > png_ptr->old_big_row_buf_size)
    {
      png_free(png_ptr, png_ptr->big_row_buf);
-     png_ptr->big_row_buf = (png_bytep)png_malloc(png_ptr, row_bytes+64);
-     png_ptr->row_buf = png_ptr->big_row_buf+32;
-     png_ptr->old_big_row_buf_size = row_bytes+64;
+     png_ptr->big_row_buf = (png_bytep)png_malloc(png_ptr, row_bytes + 64);
+     if (png_ptr->interlaced)
+       png_memset(png_ptr->big_row_buf, 0, row_bytes + 64);
+     png_ptr->row_buf = png_ptr->big_row_buf + 32;
+     png_ptr->old_big_row_buf_size = row_bytes + 64;
    }
 
 #ifdef PNG_MAX_MALLOC_64K
-   if ((png_uint_32)png_ptr->rowbytes + 1 > (png_uint_32)65536L)
+   if ((png_uint_32)row_bytes + 1 > (png_uint_32)65536L)
       png_error(png_ptr, "This image requires a row greater than 64KB");
 #endif
-   if ((png_uint_32)png_ptr->rowbytes > (png_uint_32)(PNG_SIZE_MAX - 1))
+   if ((png_uint_32)row_bytes > (png_uint_32)(PNG_SIZE_MAX - 1))
       png_error(png_ptr, "Row has too many bytes to allocate in memory.");
 
-   if (png_ptr->rowbytes+1 > png_ptr->old_prev_row_size)
+   if (row_bytes + 1 > png_ptr->old_prev_row_size)
    {
-     png_free(png_ptr, png_ptr->prev_row);
-     png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, (png_uint_32)(
-        png_ptr->rowbytes + 1));
-     png_ptr->old_prev_row_size = png_ptr->rowbytes+1;
+      png_free(png_ptr, png_ptr->prev_row);
+      png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, (png_uint_32)(
+        row_bytes + 1));
+      png_memset_check(png_ptr, png_ptr->prev_row, 0, row_bytes + 1);
+      png_ptr->old_prev_row_size = row_bytes + 1;
    }
 
-   png_memset_check(png_ptr, png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
+   png_ptr->rowbytes = row_bytes;
 
-   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_debug1(3, "width = %lu,", png_ptr->width);
+   png_debug1(3, "height = %lu,", png_ptr->height);
+   png_debug1(3, "iwidth = %lu,", png_ptr->iwidth);
+   png_debug1(3, "num_rows = %lu,", png_ptr->num_rows);
+   png_debug1(3, "rowbytes = %lu,", png_ptr->rowbytes);
+   png_debug1(3, "irowbytes = %lu", png_ptr->irowbytes);
 
    png_ptr->flags |= PNG_FLAG_ROW_INIT;
 }

pngtest.c

@@ -1,12 +1,15 @@
 
 /* pngtest.c - a simple test program to test libpng
  *
- * Last changed in libpng 1.2.32 [September 18, 2008]
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2008 Glenn Randers-Pehrson
+ * Last changed in libpng 1.2.37 [June 4, 2009]
+ * Copyright (c) 1998-2009 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 code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
  * 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
  * the basic chunk handling, filtering, and (de)compression code is working
@@ -65,7 +68,7 @@
 #endif
 
 #if !PNG_DEBUG
-#  define SINGLE_ROWBUF_ALLOC  /* makes buffer overruns easier to nail */
+#  define SINGLE_ROWBUF_ALLOC  /* Makes buffer overruns easier to nail */
 #endif
 
 /* Turn on CPU timing
@@ -95,9 +98,9 @@ int test_one_file PNGARG((PNG_CONST char *inname, PNG_CONST char *outname));
 #include <mem.h>
 #endif
 
-/* defined so I can write to a file on gui/windowing platforms */
+/* Defined so I can write to a file on gui/windowing platforms */
 /*  #define STDERR stderr  */
-#define STDERR stdout   /* for DOS */
+#define STDERR stdout   /* For DOS */
 
 /* In case a system header (e.g., on AIX) defined jmpbuf */
 #ifdef jmpbuf
@@ -109,7 +112,7 @@ int test_one_file PNGARG((PNG_CONST char *inname, PNG_CONST char *outname));
 #  define png_jmpbuf(png_ptr) png_ptr->jmpbuf
 #endif
 
-/* example of using row callbacks to make a simple progress meter */
+/* Example of using row callbacks to make a simple progress meter */
 static int status_pass = 1;
 static int status_dots_requested = 0;
 static int status_dots = 1;
@@ -125,20 +128,21 @@ PNGAPI
 #endif
 read_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
 {
-    if (png_ptr == NULL || row_number > PNG_UINT_31_MAX) return;
-    if (status_pass != pass)
-    {
-       fprintf(stdout, "\n Pass %d: ", pass);
-       status_pass = pass;
-       status_dots = 31;
-    }
-    status_dots--;
-    if (status_dots == 0)
-    {
-       fprintf(stdout, "\n         ");
-       status_dots=30;
-    }
-    fprintf(stdout, "r");
+   if (png_ptr == NULL || row_number > PNG_UINT_31_MAX)
+      return;
+   if (status_pass != pass)
+   {
+      fprintf(stdout, "\n Pass %d: ", pass);
+      status_pass = pass;
+      status_dots = 31;
+   }
+   status_dots--;
+   if (status_dots == 0)
+   {
+      fprintf(stdout, "\n         ");
+      status_dots=30;
+   }
+   fprintf(stdout, "r");
 }
 
 void
@@ -152,15 +156,17 @@ PNGAPI
 #endif
 write_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
 {
-    if (png_ptr == NULL || row_number > PNG_UINT_31_MAX || pass > 7) return;
-    fprintf(stdout, "w");
+   if (png_ptr == NULL || row_number > PNG_UINT_31_MAX || pass > 7)
+      return;
+   fprintf(stdout, "w");
 }
 
 
 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
 /* Example of using user transform callback (we don't transform anything,
-   but merely examine the row filters.  We set this to 256 rather than
-   5 in case illegal filter values are present.) */
+ * but merely examine the row filters.  We set this to 256 rather than
+ * 5 in case illegal filter values are present.)
+ */
 static png_uint_32 filters_used[256];
 void
 #ifdef PNG_1_0_X
@@ -173,14 +179,15 @@ PNGAPI
 #endif
 count_filters(png_structp png_ptr, png_row_infop row_info, png_bytep data)
 {
-    if (png_ptr != NULL && row_info != NULL)
+   if (png_ptr != NULL && row_info != NULL)
       ++filters_used[*(data - 1)];
 }
 #endif
 
 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
-/* example of using user transform callback (we don't transform anything,
-   but merely count the zero samples) */
+/* Example of using user transform callback (we don't transform anything,
+ * but merely count the zero samples)
+ */
 
 static png_uint_32 zero_samples;
 
@@ -198,7 +205,7 @@ count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
    png_bytep dp = data;
    if (png_ptr == NULL)return;
 
-   /* contents of row_info:
+   /* Contents of row_info:
     *  png_uint_32 width      width of row
     *  png_uint_32 rowbytes   number of bytes in row
     *  png_byte color_type    color type of pixels
@@ -207,8 +214,7 @@ count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
     *  png_byte pixel_depth   bits per pixel (depth*channels)
     */
 
-
-    /* counts the number of zero samples (or zero pixels if color_type is 3 */
+    /* Counts the number of zero samples (or zero pixels if color_type is 3 */
 
     if (row_info->color_type == 0 || row_info->color_type == 3)
     {
@@ -218,7 +224,8 @@ count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
        {
           if (row_info->bit_depth == 1)
           {
-             if (((*dp << pos++ ) & 0x80) == 0) zero_samples++;
+             if (((*dp << pos++ ) & 0x80) == 0)
+                zero_samples++;
              if (pos == 8)
              {
                 pos = 0;
@@ -227,7 +234,8 @@ count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
           }
           if (row_info->bit_depth == 2)
           {
-             if (((*dp << (pos+=2)) & 0xc0) == 0) zero_samples++;
+             if (((*dp << (pos+=2)) & 0xc0) == 0)
+                zero_samples++;
              if (pos == 8)
              {
                 pos = 0;
@@ -236,7 +244,8 @@ count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
           }
           if (row_info->bit_depth == 4)
           {
-             if (((*dp << (pos+=4)) & 0xf0) == 0) zero_samples++;
+             if (((*dp << (pos+=4)) & 0xf0) == 0)
+                zero_samples++;
              if (pos == 8)
              {
                 pos = 0;
@@ -244,15 +253,17 @@ count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
              }
           }
           if (row_info->bit_depth == 8)
-             if (*dp++ == 0) zero_samples++;
+             if (*dp++ == 0)
+                zero_samples++;
           if (row_info->bit_depth == 16)
           {
-             if ((*dp | *(dp+1)) == 0) zero_samples++;
+             if ((*dp | *(dp+1)) == 0)
+                zero_samples++;
              dp+=2;
           }
        }
     }
-    else /* other color types */
+    else /* Other color types */
     {
        png_uint_32 n, nstop;
        int channel;
@@ -264,17 +275,20 @@ count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
           for (channel = 0; channel < color_channels; channel++)
           {
              if (row_info->bit_depth == 8)
-                if (*dp++ == 0) zero_samples++;
+                if (*dp++ == 0)
+                   zero_samples++;
              if (row_info->bit_depth == 16)
              {
-                if ((*dp | *(dp+1)) == 0) zero_samples++;
+                if ((*dp | *(dp+1)) == 0)
+                   zero_samples++;
                 dp+=2;
              }
           }
           if (row_info->color_type > 3)
           {
              dp++;
-             if (row_info->bit_depth == 16)dp++;
+             if (row_info->bit_depth == 16)
+                dp++;
           }
        }
     }
@@ -285,12 +299,13 @@ static int wrote_question = 0;
 
 #if defined(PNG_NO_STDIO)
 /* START of code to validate stdio-free compilation */
-/* These copies of the default read/write functions come from pngrio.c and */
-/* pngwio.c.  They allow "don't include stdio" testing of the library. */
-/* This is the function that does the actual reading of data.  If you are
-   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. */
+/* These copies of the default read/write functions come from pngrio.c and
+ * pngwio.c.  They allow "don't include stdio" testing of the library.
+ * This is the function that does the actual reading of data.  If you are
+ * 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
@@ -309,7 +324,7 @@ pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
    }
 }
 #else
-/* this is the model-independent version. Since the standard I/O library
+/* This is the model-independent version. Since the standard I/O library
    can't handle far buffers in the medium and small models, we have to copy
    the data.
 */
@@ -341,7 +356,7 @@ pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
       {
          read = MIN(NEAR_BUF_SIZE, remaining);
          READFILE(io_ptr, buf, 1, err);
-         png_memcpy(data, buf, read); /* copy far buffer to near buffer */
+         png_memcpy(data, buf, read); /* Copy far buffer to near buffer */
          if (err != read)
             break;
          else
@@ -352,9 +367,7 @@ pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
       while (remaining != 0);
    }
    if (check != length)
-   {
       png_error(png_ptr, "read Error");
-   }
 }
 #endif /* USE_FAR_KEYWORD */
 
@@ -362,19 +375,16 @@ pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 static void
 pngtest_flush(png_structp png_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
+   /* Do nothing; fflush() is said to be just a waste of energy. */
+   png_ptr = png_ptr;  /* Stifle compiler warning */
 }
 #endif
 
 /* This is the function that does the actual writing of data.  If you are
-   not writing to a standard C stream, you should create a replacement
-   write_data function and use it at run time with png_set_write_fn(), rather
-   than changing the library. */
+ * not writing to a standard C stream, you should create a replacement
+ * write_data function and use it at run time with png_set_write_fn(), rather
+ * than changing the library.
+ */
 #ifndef USE_FAR_KEYWORD
 static void
 pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
@@ -388,7 +398,7 @@ pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
    }
 }
 #else
-/* this is the model-independent version. Since the standard I/O library
+/* This is the model-independent version. Since the standard I/O library
    can't handle far buffers in the medium and small models, we have to copy
    the data.
 */
@@ -419,7 +429,7 @@ pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
       do
       {
          written = MIN(NEAR_BUF_SIZE, remaining);
-         png_memcpy(buf, data, written); /* copy far buffer to near buffer */
+         png_memcpy(buf, data, written); /* Copy far buffer to near buffer */
          WRITEFILE(io_ptr, buf, written, err);
          if (err != written)
             break;
@@ -461,7 +471,8 @@ pngtest_error(png_structp png_ptr, png_const_charp message)
 {
    pngtest_warning(png_ptr, message);
    /* We can return because png_error calls the default handler, which is
-    * actually OK in this case. */
+    * actually OK in this case.
+    */
 }
 #endif /* PNG_NO_STDIO */
 /* END of code to validate stdio-free compilation */
@@ -470,13 +481,14 @@ pngtest_error(png_structp png_ptr, png_const_charp message)
 #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
 
 /* Allocate memory.  For reasonable files, size should never exceed
-   64K.  However, zlib may allocate more then 64K if you don't tell
-   it not to.  See zconf.h and png.h for more information.  zlib does
-   need to allocate exactly 64K, so whatever you call here must
-   have the ability to do that.
-
-   This piece of code can be compiled to validate max 64K allocations
-   by setting MAXSEG_64K in zlib zconf.h *or* PNG_MAX_MALLOC_64K. */
+ * 64K.  However, zlib may allocate more then 64K if you don't tell
+ * it not to.  See zconf.h and png.h for more information.  zlib does
+ * need to allocate exactly 64K, so whatever you call here must
+ * have the ability to do that.
+ *
+ * This piece of code can be compiled to validate max 64K allocations
+ * by setting MAXSEG_64K in zlib zconf.h *or* PNG_MAX_MALLOC_64K.
+ */
 typedef struct memory_information
 {
    png_uint_32               size;
@@ -499,7 +511,8 @@ png_debug_malloc(png_structp png_ptr, png_uint_32 size)
 {
 
    /* png_malloc has already tested for NULL; png_create_struct calls
-      png_debug_malloc directly, with png_ptr == NULL which is OK */
+    * png_debug_malloc directly, with png_ptr == NULL which is OK
+    */
 
    if (size == 0)
       return (NULL);
@@ -596,7 +609,7 @@ png_debug_free(png_structp png_ptr, png_voidp ptr)
 /* Demonstration of user chunk support of the sTER and vpAg chunks */
 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
 
-/* (sTER is a public chunk not yet understood by libpng.  vpAg is a private
+/* (sTER is a public chunk not yet known by libpng.  vpAg is a private
 chunk used in ImageMagick to store "virtual page" size).  */
 
 static png_uint_32 user_chunk_data[4];
@@ -610,50 +623,51 @@ static png_uint_32 user_chunk_data[4];
 static int read_user_chunk_callback(png_struct *png_ptr,
    png_unknown_chunkp chunk)
 {
-  png_uint_32
-    *user_chunk_data;
+   png_uint_32
+     *my_user_chunk_data;
 
-  /* Return one of the following: */
-     /* return (-n);  chunk had an error */
-     /* return (0);  did not recognize */
-     /* return (n);  success */
+   /* Return one of the following:
+    *    return (-n);  chunk had an error
+    *    return (0);  did not recognize
+    *    return (n);  success
+    *
+    * The unknown chunk structure contains the chunk data:
+    * png_byte name[5];
+    * png_byte *data;
+    * png_size_t size;
+    *
+    * Note that libpng has already taken care of the CRC handling.
+    */
 
-  /* The unknown chunk structure contains the chunk data:
-   * png_byte name[5];
-   * png_byte *data;
-   * png_size_t size;
-   *
-   *  Note that libpng has already taken care of the CRC handling.
-   */
+   if (chunk->name[0] == 115 && chunk->name[1] ==  84 &&     /* s  T */
+       chunk->name[2] ==  69 && chunk->name[3] ==  82)       /* E  R */
+      {
+         /* Found sTER chunk */
+         if (chunk->size != 1)
+            return (-1); /* Error return */
+         if (chunk->data[0] != 0 && chunk->data[0] != 1)
+            return (-1);  /* Invalid mode */
+         my_user_chunk_data=(png_uint_32 *) png_get_user_chunk_ptr(png_ptr);
+         my_user_chunk_data[0]=chunk->data[0]+1;
+         return (1);
+      }
 
-  if (chunk->name[0] == 115 && chunk->name[1] ==  84 &&     /* s  T */
-      chunk->name[2] ==  69 && chunk->name[3] ==  82)       /* E  R */
-     {
-       /* Found sTER chunk */
-       if (chunk->size != 1)
-         return (-1); /* Error return */
-       if (chunk->data[0] != 0 && chunk->data[0] != 1)
-          return (-1);  /* Invalid mode */
-       user_chunk_data=(png_uint_32 *) png_get_user_chunk_ptr(png_ptr);
-       user_chunk_data[0]=chunk->data[0]+1;
-       return (1);
-     }
-  if (chunk->name[0] != 118 || chunk->name[1] != 112 ||    /* v  p */
-      chunk->name[2] !=  65 || chunk->name[3] != 103)      /* A  g */
-    return (0); /* Did not recognize */
+   if (chunk->name[0] != 118 || chunk->name[1] != 112 ||    /* v  p */
+       chunk->name[2] !=  65 || chunk->name[3] != 103)      /* A  g */
+      return (0); /* Did not recognize */
 
-  /* Found ImageMagick vpAg chunk */
+   /* Found ImageMagick vpAg chunk */
 
-  if (chunk->size != 9)
-    return (-1); /* Error return */
+   if (chunk->size != 9)
+      return (-1); /* Error return */
 
-  user_chunk_data=(png_uint_32 *) png_get_user_chunk_ptr(png_ptr);
+   my_user_chunk_data=(png_uint_32 *) png_get_user_chunk_ptr(png_ptr);
 
-  user_chunk_data[1]=png_get_uint_31(png_ptr, chunk->data);
-  user_chunk_data[2]=png_get_uint_31(png_ptr, chunk->data + 4);
-  user_chunk_data[3]=(png_uint_32)chunk->data[8];
+   my_user_chunk_data[1]=png_get_uint_31(png_ptr, chunk->data);
+   my_user_chunk_data[2]=png_get_uint_31(png_ptr, chunk->data + 4);
+   my_user_chunk_data[3]=(png_uint_32)chunk->data[8];
 
-  return (1);
+   return (1);
 
 }
 #endif
@@ -717,7 +731,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
       return (1);
    }
 
-   png_debug(0, "Allocating read and write structures\n");
+   png_debug(0, "Allocating read and write structures");
 #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG
    read_ptr =
       png_create_read_struct_2(PNG_LIBPNG_VER_STRING, png_voidp_NULL,
@@ -734,12 +748,12 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #endif
 
 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
-  user_chunk_data[0] = 0;
-  user_chunk_data[1] = 0;
-  user_chunk_data[2] = 0;
-  user_chunk_data[3] = 0;
-  png_set_read_user_chunk_fn(read_ptr, user_chunk_data,
-    read_user_chunk_callback);
+   user_chunk_data[0] = 0;
+   user_chunk_data[1] = 0;
+   user_chunk_data[2] = 0;
+   user_chunk_data[3] = 0;
+   png_set_read_user_chunk_fn(read_ptr, user_chunk_data,
+     read_user_chunk_callback);
 
 #endif
 #ifdef PNG_WRITE_SUPPORTED
@@ -758,7 +772,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
        pngtest_warning);
 #endif
 #endif
-   png_debug(0, "Allocating read_info, write_info and end_info structures\n");
+   png_debug(0, "Allocating read_info, write_info and end_info structures");
    read_info_ptr = png_create_info_struct(read_ptr);
    end_info_ptr = png_create_info_struct(read_ptr);
 #ifdef PNG_WRITE_SUPPORTED
@@ -767,7 +781,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #endif
 
 #ifdef PNG_SETJMP_SUPPORTED
-   png_debug(0, "Setting jmpbuf for read struct\n");
+   png_debug(0, "Setting jmpbuf for read struct");
 #ifdef USE_FAR_KEYWORD
    if (setjmp(jmpbuf))
 #else
@@ -791,7 +805,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #endif
 
 #ifdef PNG_WRITE_SUPPORTED
-   png_debug(0, "Setting jmpbuf for write struct\n");
+   png_debug(0, "Setting jmpbuf for write struct");
 #ifdef USE_FAR_KEYWORD
    if (setjmp(jmpbuf))
 #else
@@ -814,7 +828,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #endif
 #endif
 
-   png_debug(0, "Initializing input and output streams\n");
+   png_debug(0, "Initializing input and output streams");
 #if !defined(PNG_NO_STDIO)
    png_init_io(read_ptr, fpin);
 #  ifdef PNG_WRITE_SUPPORTED
@@ -848,10 +862,10 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 
 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
    {
-     int i;
-     for (i = 0; i<256; i++)
-        filters_used[i] = 0;
-     png_set_read_user_transform_fn(read_ptr, count_filters);
+      int i;
+      for (i = 0; i<256; i++)
+         filters_used[i] = 0;
+      png_set_read_user_transform_fn(read_ptr, count_filters);
    }
 #endif
 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
@@ -874,10 +888,10 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
       png_bytep_NULL, 0);
 #endif
 
-   png_debug(0, "Reading info struct\n");
+   png_debug(0, "Reading info struct");
    png_read_info(read_ptr, read_info_ptr);
 
-   png_debug(0, "Transferring info struct\n");
+   png_debug(0, "Transferring info struct");
    {
       int interlace_type, compression_type, filter_type;
 
@@ -910,9 +924,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
       png_fixed_point gamma;
 
       if (png_get_gAMA_fixed(read_ptr, read_info_ptr, &gamma))
-      {
          png_set_gAMA_fixed(write_ptr, write_info_ptr, gamma);
-      }
    }
 #endif
 #else /* Use floating point versions */
@@ -934,13 +946,11 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
       double gamma;
 
       if (png_get_gAMA(read_ptr, read_info_ptr, &gamma))
-      {
          png_set_gAMA(write_ptr, write_info_ptr, gamma);
-      }
    }
 #endif
-#endif /* floating point */
-#endif /* fixed point */
+#endif /* Floating point */
+#endif /* Fixed point */
 #if defined(PNG_iCCP_SUPPORTED)
    {
       png_charp name;
@@ -961,9 +971,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
       int intent;
 
       if (png_get_sRGB(read_ptr, read_info_ptr, &intent))
-      {
          png_set_sRGB(write_ptr, write_info_ptr, intent);
-      }
    }
 #endif
    {
@@ -971,9 +979,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
       int num_palette;
 
       if (png_get_PLTE(read_ptr, read_info_ptr, &palette, &num_palette))
-      {
          png_set_PLTE(write_ptr, write_info_ptr, palette, num_palette);
-      }
    }
 #if defined(PNG_bKGD_SUPPORTED)
    {
@@ -990,9 +996,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
       png_uint_16p hist;
 
       if (png_get_hIST(read_ptr, read_info_ptr, &hist))
-      {
          png_set_hIST(write_ptr, write_info_ptr, hist);
-      }
    }
 #endif
 #if defined(PNG_oFFs_SUPPORTED)
@@ -1001,7 +1005,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
       int unit_type;
 
       if (png_get_oFFs(read_ptr, read_info_ptr, &offset_x, &offset_y,
-         &unit_type))
+          &unit_type))
       {
          png_set_oFFs(write_ptr, write_info_ptr, offset_x, offset_y, unit_type);
       }
@@ -1028,9 +1032,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
       int unit_type;
 
       if (png_get_pHYs(read_ptr, read_info_ptr, &res_x, &res_y, &unit_type))
-      {
          png_set_pHYs(write_ptr, write_info_ptr, res_x, res_y, unit_type);
-      }
    }
 #endif
 #if defined(PNG_sBIT_SUPPORTED)
@@ -1038,9 +1040,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
       png_color_8p sig_bit;
 
       if (png_get_sBIT(read_ptr, read_info_ptr, &sig_bit))
-      {
          png_set_sBIT(write_ptr, write_info_ptr, sig_bit);
-      }
    }
 #endif
 #if defined(PNG_sCAL_SUPPORTED)
@@ -1077,7 +1077,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 
       if (png_get_text(read_ptr, read_info_ptr, &text_ptr, &num_text) > 0)
       {
-         png_debug1(0, "Handling %d iTXt/tEXt/zTXt chunks\n", num_text);
+         png_debug1(0, "Handling %d iTXt/tEXt/zTXt chunks", num_text);
          png_set_text(write_ptr, write_info_ptr, text_ptr, num_text);
       }
    }
@@ -1090,9 +1090,10 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
       {
          png_set_tIME(write_ptr, write_info_ptr, mod_time);
 #if defined(PNG_TIME_RFC1123_SUPPORTED)
-         /* we have to use png_memcpy instead of "=" because the string
-            pointed to by png_convert_to_rfc1123() gets free'ed before
-            we use it */
+         /* We have to use png_memcpy instead of "=" because the string
+          * pointed to by png_convert_to_rfc1123() gets free'ed before
+          * we use it.
+          */
          png_memcpy(tIME_string,
                     png_convert_to_rfc1123(read_ptr, mod_time),
                     png_sizeof(tIME_string));
@@ -1114,13 +1115,13 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
          int sample_max = (1 << read_info_ptr->bit_depth);
          /* libpng doesn't reject a tRNS chunk with out-of-range samples */
          if (!((read_info_ptr->color_type == PNG_COLOR_TYPE_GRAY &&
-            (int)trans_values->gray > sample_max) ||
-            (read_info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
-            ((int)trans_values->red > sample_max ||
-            (int)trans_values->green > sample_max ||
-            (int)trans_values->blue > sample_max))))
-           png_set_tRNS(write_ptr, write_info_ptr, trans, num_trans,
-              trans_values);
+             (int)trans_values->gray > sample_max) ||
+             (read_info_ptr->color_type == PNG_COLOR_TYPE_RGB &&
+             ((int)trans_values->red > sample_max ||
+             (int)trans_values->green > sample_max ||
+             (int)trans_values->blue > sample_max))))
+            png_set_tRNS(write_ptr, write_info_ptr, trans, num_trans,
+               trans_values);
       }
    }
 #endif
@@ -1134,9 +1135,10 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
          png_size_t i;
          png_set_unknown_chunks(write_ptr, write_info_ptr, unknowns,
            num_unknowns);
-         /* copy the locations from the read_info_ptr.  The automatically
-            generated locations in write_info_ptr are wrong because we
-            haven't written anything yet */
+         /* Copy the locations from the read_info_ptr.  The automatically
+          * generated locations in write_info_ptr are wrong because we
+          * haven't written anything yet.
+          */
          for (i = 0; i < (png_size_t)num_unknowns; i++)
            png_set_unknown_chunk_location(write_ptr, write_info_ptr, i,
              unknowns[i].location);
@@ -1145,55 +1147,55 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #endif
 
 #ifdef PNG_WRITE_SUPPORTED
-   png_debug(0, "\nWriting info struct\n");
+   png_debug(0, "Writing info struct");
 
 /* If we wanted, we could write info in two steps:
-   png_write_info_before_PLTE(write_ptr, write_info_ptr);
+ * png_write_info_before_PLTE(write_ptr, write_info_ptr);
  */
    png_write_info(write_ptr, write_info_ptr);
 
 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
    if (user_chunk_data[0] != 0)
    {
-     png_byte png_sTER[5] = {115,  84,  69,  82, '\0'};
+      png_byte png_sTER[5] = {115,  84,  69,  82, '\0'};
 
-     unsigned char
-       ster_chunk_data[1];
+      unsigned char
+        ster_chunk_data[1];
 
-     if (verbose)
-        fprintf(STDERR, "stereo mode = %lu\n",
-          (unsigned long)(user_chunk_data[0] - 1));
-     ster_chunk_data[0]=(unsigned char)(user_chunk_data[0] - 1);
-     png_write_chunk(write_ptr, png_sTER, ster_chunk_data, 1);
+      if (verbose)
+         fprintf(STDERR, "\n stereo mode = %lu\n",
+           (unsigned long)(user_chunk_data[0] - 1));
+      ster_chunk_data[0]=(unsigned char)(user_chunk_data[0] - 1);
+      png_write_chunk(write_ptr, png_sTER, ster_chunk_data, 1);
    }
    if (user_chunk_data[1] != 0 || user_chunk_data[2] != 0)
    {
-     png_byte png_vpAg[5] = {118, 112,  65, 103, '\0'};
+      png_byte png_vpAg[5] = {118, 112,  65, 103, '\0'};
 
-     unsigned char
-       vpag_chunk_data[9];
+      unsigned char
+        vpag_chunk_data[9];
 
-     if (verbose)
-        fprintf(STDERR, "vpAg = %lu x %lu, units=%lu\n",
-          (unsigned long)user_chunk_data[1],
-          (unsigned long)user_chunk_data[2],
-          (unsigned long)user_chunk_data[3]);
-     png_save_uint_32(vpag_chunk_data, user_chunk_data[1]);
-     png_save_uint_32(vpag_chunk_data + 4, user_chunk_data[2]);
-     vpag_chunk_data[8] = (unsigned char)(user_chunk_data[3] & 0xff);
-     png_write_chunk(write_ptr, png_vpAg, vpag_chunk_data, 9);
+      if (verbose)
+         fprintf(STDERR, " vpAg = %lu x %lu, units = %lu\n",
+           (unsigned long)user_chunk_data[1],
+           (unsigned long)user_chunk_data[2],
+           (unsigned long)user_chunk_data[3]);
+      png_save_uint_32(vpag_chunk_data, user_chunk_data[1]);
+      png_save_uint_32(vpag_chunk_data + 4, user_chunk_data[2]);
+      vpag_chunk_data[8] = (unsigned char)(user_chunk_data[3] & 0xff);
+      png_write_chunk(write_ptr, png_vpAg, vpag_chunk_data, 9);
    }
 
 #endif
 #endif
 
 #ifdef SINGLE_ROWBUF_ALLOC
-   png_debug(0, "\nAllocating row buffer...");
+   png_debug(0, "Allocating row buffer...");
    row_buf = (png_bytep)png_malloc(read_ptr,
       png_get_rowbytes(read_ptr, read_info_ptr));
-   png_debug1(0, "0x%08lx\n\n", (unsigned long)row_buf);
+   png_debug1(0, "0x%08lx", (unsigned long)row_buf);
 #endif /* SINGLE_ROWBUF_ALLOC */
-   png_debug(0, "Writing row data\n");
+   png_debug(0, "Writing row data");
 
 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \
   defined(PNG_WRITE_INTERLACING_SUPPORTED)
@@ -1212,14 +1214,14 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #endif
    for (pass = 0; pass < num_pass; pass++)
    {
-      png_debug1(0, "Writing row data for pass %d\n", pass);
+      png_debug1(0, "Writing row data for pass %d", pass);
       for (y = 0; y < height; y++)
       {
 #ifndef SINGLE_ROWBUF_ALLOC
-         png_debug2(0, "\nAllocating row buffer (pass %d, y = %ld)...", pass, y);
+         png_debug2(0, "Allocating 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_debug2(0, "0x%08lx (%ld bytes)", (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);
@@ -1239,7 +1241,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 #endif /* PNG_WRITE_SUPPORTED */
 
 #ifndef SINGLE_ROWBUF_ALLOC
-         png_debug2(0, "Freeing row buffer (pass %d, y = %ld)\n\n", pass, y);
+         png_debug2(0, "Freeing row buffer (pass %d, y = %ld)", pass, y);
          png_free(read_ptr, row_buf);
          row_buf = NULL;
 #endif /* !SINGLE_ROWBUF_ALLOC */
@@ -1253,7 +1255,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
    png_free_data(write_ptr, write_info_ptr, PNG_FREE_UNKN, -1);
 #endif
 
-   png_debug(0, "Reading and writing end_info data\n");
+   png_debug(0, "Reading and writing end_info data");
 
    png_read_end(read_ptr, end_info_ptr);
 #if defined(PNG_TEXT_SUPPORTED)
@@ -1263,7 +1265,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
 
       if (png_get_text(read_ptr, end_info_ptr, &text_ptr, &num_text) > 0)
       {
-         png_debug1(0, "Handling %d iTXt/tEXt/zTXt chunks\n", num_text);
+         png_debug1(0, "Handling %d iTXt/tEXt/zTXt chunks", num_text);
          png_set_text(write_ptr, write_end_info_ptr, text_ptr, num_text);
       }
    }
@@ -1276,7 +1278,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
       {
          png_set_tIME(write_ptr, write_end_info_ptr, mod_time);
 #if defined(PNG_TIME_RFC1123_SUPPORTED)
-         /* we have to use png_memcpy instead of "=" because the string
+         /* We have to use png_memcpy instead of "=" because the string
             pointed to by png_convert_to_rfc1123() gets free'ed before
             we use it */
          png_memcpy(tIME_string,
@@ -1299,9 +1301,10 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
          png_size_t i;
          png_set_unknown_chunks(write_ptr, write_end_info_ptr, unknowns,
            num_unknowns);
-         /* copy the locations from the read_info_ptr.  The automatically
-            generated locations in write_end_info_ptr are wrong because we
-            haven't written the end_info yet */
+         /* Copy the locations from the read_info_ptr.  The automatically
+          * generated locations in write_end_info_ptr are wrong because we
+          * haven't written the end_info yet.
+          */
          for (i = 0; i < (png_size_t)num_unknowns; i++)
            png_set_unknown_chunk_location(write_ptr, write_end_info_ptr, i,
              unknowns[i].location);
@@ -1318,31 +1321,31 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
       png_uint_32 iwidth, iheight;
       iwidth = png_get_image_width(write_ptr, write_info_ptr);
       iheight = png_get_image_height(write_ptr, write_info_ptr);
-      fprintf(STDERR, "Image width = %lu, height = %lu\n",
+      fprintf(STDERR, "\n Image width = %lu, height = %lu\n",
          (unsigned long)iwidth, (unsigned long)iheight);
    }
 #endif
 
-   png_debug(0, "Destroying data structs\n");
+   png_debug(0, "Destroying data structs");
 #ifdef SINGLE_ROWBUF_ALLOC
-   png_debug(1, "destroying row_buf for read_ptr\n");
+   png_debug(1, "destroying row_buf for read_ptr");
    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_debug(1, "destroying read_ptr, read_info_ptr, end_info_ptr");
    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_debug(1, "destroying write_end_info_ptr");
    png_destroy_info_struct(write_ptr, &write_end_info_ptr);
-   png_debug(1, "destroying write_ptr, write_info_ptr\n");
+   png_debug(1, "destroying write_ptr, write_info_ptr");
    png_destroy_write_struct(&write_ptr, &write_info_ptr);
 #endif
-   png_debug(0, "Destruction complete.\n");
+   png_debug(0, "Destruction complete.");
 
    FCLOSE(fpin);
    FCLOSE(fpout);
 
-   png_debug(0, "Opening files for comparison\n");
+   png_debug(0, "Opening files for comparison");
 #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)
@@ -1424,7 +1427,7 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
    return (0);
 }
 
-/* input and output filenames */
+/* Input and output filenames */
 #ifdef RISCOS
 static PNG_CONST char *inname = "pngtest/png";
 static PNG_CONST char *outname = "pngout/png";
@@ -1439,7 +1442,7 @@ main(int argc, char *argv[])
    int multiple = 0;
    int ierror = 0;
 
-   fprintf(STDERR, "Testing libpng version %s\n", PNG_LIBPNG_VER_STRING);
+   fprintf(STDERR, "\n Testing libpng version %s\n", PNG_LIBPNG_VER_STRING);
    fprintf(STDERR, "   with zlib   version %s\n", ZLIB_VERSION);
    fprintf(STDERR, "%s", png_get_copyright(NULL));
    /* Show the version of libpng used in building the library */
@@ -1453,9 +1456,10 @@ main(int argc, char *argv[])
                     (long)png_sizeof(png_struct), (long)png_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
-      tests should be impossible because of the way the macros are set
-      in pngconf.h */
+    * not sure this matters, but it is nice to know, the first of these
+    * tests should be impossible because of the way the macros are set
+    * in pngconf.h
+    */
 #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
       fprintf(STDERR, " NOTE: Zlib compiled for max 64k, libpng not\n");
 #endif
@@ -1527,7 +1531,7 @@ main(int argc, char *argv[])
          int k;
 #endif
          int kerror;
-         fprintf(STDERR, "Testing %s:", argv[i]);
+         fprintf(STDERR, "\n Testing %s:", argv[i]);
          kerror = test_one_file(argv[i], outname);
          if (kerror == 0)
          {
@@ -1597,7 +1601,7 @@ main(int argc, char *argv[])
          if (i == 1) status_dots_requested = 1;
          else if (verbose == 0)status_dots_requested = 0;
          if (i == 0 || verbose == 1 || ierror != 0)
-            fprintf(STDERR, "Testing %s:", inname);
+            fprintf(STDERR, "\n Testing %s:", inname);
          kerror = test_one_file(inname, outname);
          if (kerror == 0)
          {
@@ -1628,7 +1632,7 @@ main(int argc, char *argv[])
          else
          {
             if (verbose == 0 && i != 2)
-               fprintf(STDERR, "Testing %s:", inname);
+               fprintf(STDERR, "\n Testing %s:", inname);
             fprintf(STDERR, " FAIL\n");
             ierror += kerror;
          }
@@ -1678,11 +1682,11 @@ main(int argc, char *argv[])
 #endif
 
    if (ierror == 0)
-      fprintf(STDERR, "libpng passes test\n");
+      fprintf(STDERR, " libpng passes test\n");
    else
-      fprintf(STDERR, "libpng FAILS test\n");
+      fprintf(STDERR, " libpng FAILS test\n");
    return (int)(ierror != 0);
 }
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_0_41 your_png_h_is_not_version_1_0_41;
+typedef version_1_0_50 your_png_h_is_not_version_1_0_50;

pngtrans.c

@@ -1,11 +1,14 @@
 
 /* pngtrans.c - transforms the data in a row (used by both readers and writers)
  *
- * Last changed in libpng 1.2.30 [August 15, 2008]
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2008 Glenn Randers-Pehrson
+ * Last changed in libpng 1.2.36 [May 14, 2009]
+ * Copyright (c) 1998-2009 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 code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
  */
 
 #define PNG_INTERNAL
@@ -13,35 +16,38 @@
 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
 
 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
-/* turn on BGR-to-RGB mapping */
+/* Turn on BGR-to-RGB mapping */
 void PNGAPI
 png_set_bgr(png_structp png_ptr)
 {
-   png_debug(1, "in png_set_bgr\n");
-   if (png_ptr == NULL) return;
+   png_debug(1, "in png_set_bgr");
+   if (png_ptr == NULL)
+      return;
    png_ptr->transformations |= PNG_BGR;
 }
 #endif
 
 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
-/* turn on 16 bit byte swapping */
+/* Turn on 16 bit byte swapping */
 void PNGAPI
 png_set_swap(png_structp png_ptr)
 {
-   png_debug(1, "in png_set_swap\n");
-   if (png_ptr == NULL) return;
+   png_debug(1, "in png_set_swap");
+   if (png_ptr == NULL)
+      return;
    if (png_ptr->bit_depth == 16)
       png_ptr->transformations |= PNG_SWAP_BYTES;
 }
 #endif
 
 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
-/* turn on pixel packing */
+/* Turn on pixel packing */
 void PNGAPI
 png_set_packing(png_structp png_ptr)
 {
-   png_debug(1, "in png_set_packing\n");
-   if (png_ptr == NULL) return;
+   png_debug(1, "in png_set_packing");
+   if (png_ptr == NULL)
+      return;
    if (png_ptr->bit_depth < 8)
    {
       png_ptr->transformations |= PNG_PACK;
@@ -51,12 +57,13 @@ png_set_packing(png_structp png_ptr)
 #endif
 
 #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED)
-/* turn on packed pixel swapping */
+/* Turn on packed pixel swapping */
 void PNGAPI
 png_set_packswap(png_structp png_ptr)
 {
-   png_debug(1, "in png_set_packswap\n");
-   if (png_ptr == NULL) return;
+   png_debug(1, "in png_set_packswap");
+   if (png_ptr == NULL)
+      return;
    if (png_ptr->bit_depth < 8)
       png_ptr->transformations |= PNG_PACKSWAP;
 }
@@ -66,8 +73,9 @@ png_set_packswap(png_structp png_ptr)
 void PNGAPI
 png_set_shift(png_structp png_ptr, png_color_8p true_bits)
 {
-   png_debug(1, "in png_set_shift\n");
-   if (png_ptr == NULL) return;
+   png_debug(1, "in png_set_shift");
+   if (png_ptr == NULL)
+      return;
    png_ptr->transformations |= PNG_SHIFT;
    png_ptr->shift = *true_bits;
 }
@@ -78,7 +86,7 @@ png_set_shift(png_structp png_ptr, png_color_8p true_bits)
 int PNGAPI
 png_set_interlace_handling(png_structp png_ptr)
 {
-   png_debug(1, "in png_set_interlace handling\n");
+   png_debug(1, "in png_set_interlace handling");
    if (png_ptr && png_ptr->interlaced)
    {
       png_ptr->transformations |= PNG_INTERLACE;
@@ -98,8 +106,9 @@ png_set_interlace_handling(png_structp png_ptr)
 void PNGAPI
 png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc)
 {
-   png_debug(1, "in png_set_filler\n");
-   if (png_ptr == NULL) return;
+   png_debug(1, "in png_set_filler");
+   if (png_ptr == NULL)
+      return;
    png_ptr->transformations |= PNG_FILLER;
    png_ptr->filler = (png_byte)filler;
    if (filler_loc == PNG_FILLER_AFTER)
@@ -131,8 +140,9 @@ png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc)
 void PNGAPI
 png_set_add_alpha(png_structp png_ptr, png_uint_32 filler, int filler_loc)
 {
-   png_debug(1, "in png_set_add_alpha\n");
-   if (png_ptr == NULL) return;
+   png_debug(1, "in png_set_add_alpha");
+   if (png_ptr == NULL)
+      return;
    png_set_filler(png_ptr, filler, filler_loc);
    png_ptr->transformations |= PNG_ADD_ALPHA;
 }
@@ -145,8 +155,9 @@ png_set_add_alpha(png_structp png_ptr, png_uint_32 filler, int filler_loc)
 void PNGAPI
 png_set_swap_alpha(png_structp png_ptr)
 {
-   png_debug(1, "in png_set_swap_alpha\n");
-   if (png_ptr == NULL) return;
+   png_debug(1, "in png_set_swap_alpha");
+   if (png_ptr == NULL)
+      return;
    png_ptr->transformations |= PNG_SWAP_ALPHA;
 }
 #endif
@@ -156,8 +167,9 @@ png_set_swap_alpha(png_structp png_ptr)
 void PNGAPI
 png_set_invert_alpha(png_structp png_ptr)
 {
-   png_debug(1, "in png_set_invert_alpha\n");
-   if (png_ptr == NULL) return;
+   png_debug(1, "in png_set_invert_alpha");
+   if (png_ptr == NULL)
+      return;
    png_ptr->transformations |= PNG_INVERT_ALPHA;
 }
 #endif
@@ -166,16 +178,17 @@ png_set_invert_alpha(png_structp png_ptr)
 void PNGAPI
 png_set_invert_mono(png_structp png_ptr)
 {
-   png_debug(1, "in png_set_invert_mono\n");
-   if (png_ptr == NULL) return;
+   png_debug(1, "in png_set_invert_mono");
+   if (png_ptr == NULL)
+      return;
    png_ptr->transformations |= PNG_INVERT_MONO;
 }
 
-/* invert monochrome grayscale data */
+/* Invert monochrome grayscale data */
 void /* PRIVATE */
 png_do_invert(png_row_infop row_info, png_bytep row)
 {
-   png_debug(1, "in png_do_invert\n");
+   png_debug(1, "in png_do_invert");
   /* This test removed from libpng version 1.0.13 and 1.2.0:
    *   if (row_info->bit_depth == 1 &&
    */
@@ -226,11 +239,11 @@ png_do_invert(png_row_infop row_info, png_bytep row)
 #endif
 
 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
-/* swaps byte order on 16 bit depth images */
+/* Swaps byte order on 16 bit depth images */
 void /* PRIVATE */
 png_do_swap(png_row_infop row_info, png_bytep row)
 {
-   png_debug(1, "in png_do_swap\n");
+   png_debug(1, "in png_do_swap");
    if (
 #if defined(PNG_USELESS_TESTS_SUPPORTED)
        row != NULL && row_info != NULL &&
@@ -357,11 +370,11 @@ static PNG_CONST png_byte fourbppswaptable[256] = {
    0x8F, 0x9F, 0xAF, 0xBF, 0xCF, 0xDF, 0xEF, 0xFF
 };
 
-/* swaps pixel packing order within bytes */
+/* Swaps pixel packing order within bytes */
 void /* PRIVATE */
 png_do_packswap(png_row_infop row_info, png_bytep row)
 {
-   png_debug(1, "in png_do_packswap\n");
+   png_debug(1, "in png_do_packswap");
    if (
 #if defined(PNG_USELESS_TESTS_SUPPORTED)
        row != NULL && row_info != NULL &&
@@ -389,11 +402,11 @@ png_do_packswap(png_row_infop row_info, png_bytep row)
 
 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
     defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
-/* remove filler or alpha byte(s) */
+/* Remove filler or alpha byte(s) */
 void /* PRIVATE */
 png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
 {
-   png_debug(1, "in png_do_strip_filler\n");
+   png_debug(1, "in png_do_strip_filler");
 #if defined(PNG_USELESS_TESTS_SUPPORTED)
    if (row != NULL && row_info != NULL)
 #endif
@@ -404,9 +417,9 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
       png_uint_32 i;
 
       if ((row_info->color_type == PNG_COLOR_TYPE_RGB ||
-         (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA &&
-         (flags & PNG_FLAG_STRIP_ALPHA))) &&
-         row_info->channels == 4)
+          (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA &&
+          (flags & PNG_FLAG_STRIP_ALPHA))) &&
+          row_info->channels == 4)
       {
          if (row_info->bit_depth == 8)
          {
@@ -547,11 +560,11 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
 #endif
 
 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
-/* swaps red and blue bytes within a pixel */
+/* Swaps red and blue bytes within a pixel */
 void /* PRIVATE */
 png_do_bgr(png_row_infop row_info, png_bytep row)
 {
-   png_debug(1, "in png_do_bgr\n");
+   png_debug(1, "in png_do_bgr");
    if (
 #if defined(PNG_USELESS_TESTS_SUPPORTED)
        row != NULL && row_info != NULL &&
@@ -624,14 +637,15 @@ png_do_bgr(png_row_infop row_info, png_bytep row)
 #endif /* PNG_READ_BGR_SUPPORTED or PNG_WRITE_BGR_SUPPORTED */
 
 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
-    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
-    defined(PNG_LEGACY_SUPPORTED)
+    defined(PNG_LEGACY_SUPPORTED) || \
+    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
 void PNGAPI
 png_set_user_transform_info(png_structp png_ptr, png_voidp
    user_transform_ptr, int user_transform_depth, int user_transform_channels)
 {
-   png_debug(1, "in png_set_user_transform_info\n");
-   if (png_ptr == NULL) return;
+   png_debug(1, "in png_set_user_transform_info");
+   if (png_ptr == NULL)
+      return;
 #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
    png_ptr->user_transform_ptr = user_transform_ptr;
    png_ptr->user_transform_depth = (png_byte)user_transform_depth;
@@ -652,7 +666,8 @@ png_set_user_transform_info(png_structp png_ptr, png_voidp
 png_voidp PNGAPI
 png_get_user_transform_ptr(png_structp png_ptr)
 {
-   if (png_ptr == NULL) return (NULL);
+   if (png_ptr == NULL)
+      return (NULL);
 #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
    return ((png_voidp)png_ptr->user_transform_ptr);
 #else

pngwio.c

@@ -1,12 +1,15 @@
 
 /* pngwio.c - functions for data output
  *
- * Last changed in libpng 1.2.30 [August 15, 2008]
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2008 Glenn Randers-Pehrson
+ * Last changed in libpng 1.2.37 [June 4, 2009]
+ * Copyright (c) 1998-2009 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 code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
  * This file provides a location for all output.  Users who need
  * special handling are expected to write functions that have the same
  * arguments as these and perform similar functions, but that possibly
@@ -20,10 +23,11 @@
 #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
-   with very small lengths, so you should implement some kind of simple
-   buffering if you are using unbuffered writes.  This should never be asked
-   to write more than 64K on a 16 bit machine.  */
+ * writes to a file pointer.  Note that this routine sometimes gets called
+ * with very small lengths, so you should implement some kind of simple
+ * buffering if you are using unbuffered writes.  This should never be asked
+ * to write more than 64K on a 16 bit machine.
+ */
 
 void /* PRIVATE */
 png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
@@ -36,16 +40,18 @@ png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 
 #if !defined(PNG_NO_STDIO)
 /* This is the function that does the actual writing of data.  If you are
-   not writing to a standard C stream, you should create a replacement
-   write_data function and use it at run time with png_set_write_fn(), rather
-   than changing the library. */
+ * not writing to a standard C stream, you should create a replacement
+ * write_data function and use it at run time with png_set_write_fn(), rather
+ * than changing the library.
+ */
 #ifndef USE_FAR_KEYWORD
 void PNGAPI
 png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    png_uint_32 check;
 
-   if (png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
 #if defined(_WIN32_WCE)
    if ( !WriteFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) )
       check = 0;
@@ -56,10 +62,10 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
       png_error(png_ptr, "Write Error");
 }
 #else
-/* this is the model-independent version. Since the standard I/O library
-   can't handle far buffers in the medium and small models, we have to copy
-   the data.
-*/
+/* This is the model-independent version. Since the standard I/O library
+ * can't handle far buffers in the medium and small models, we have to copy
+ * the data.
+ */
 
 #define NEAR_BUF_SIZE 1024
 #define MIN(a,b) (a <= b ? a : b)
@@ -71,7 +77,8 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
    png_byte *near_data;  /* Needs to be "png_byte *" instead of "png_bytep" */
    png_FILE_p io_ptr;
 
-   if (png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
    /* Check if data really is near. If so, use usual code. */
    near_data = (png_byte *)CVT_PTR_NOCHECK(data);
    io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
@@ -93,7 +100,7 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
       do
       {
          written = MIN(NEAR_BUF_SIZE, remaining);
-         png_memcpy(buf, data, written); /* copy far buffer to near buffer */
+         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;
@@ -102,8 +109,10 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 #endif
          if (err != written)
             break;
+
          else
             check += err;
+
          data += written;
          remaining -= written;
       }
@@ -117,8 +126,9 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 #endif
 
 /* This function is called to output any data pending writing (normally
-   to disk).  After png_flush is called, there should be no data pending
-   writing in any buffers. */
+ * to disk).  After png_flush is called, there should be no data pending
+ * writing in any buffers.
+ */
 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
 void /* PRIVATE */
 png_flush(png_structp png_ptr)
@@ -134,48 +144,58 @@ png_default_flush(png_structp png_ptr)
 #if !defined(_WIN32_WCE)
    png_FILE_p io_ptr;
 #endif
-   if (png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
 #if !defined(_WIN32_WCE)
    io_ptr = (png_FILE_p)CVT_PTR((png_ptr->io_ptr));
-   if (io_ptr != NULL)
-      fflush(io_ptr);
+   fflush(io_ptr);
 #endif
 }
 #endif
 #endif
 
 /* This function allows the application to supply new output functions for
-   libpng if standard C streams aren't being used.
-
-   This function takes as its arguments:
-   png_ptr       - pointer to a png output data structure
-   io_ptr        - pointer to user supplied structure containing info about
-                   the output functions.  May be NULL.
-   write_data_fn - pointer to a new output function that takes as its
-                   arguments a pointer to a png_struct, a pointer to
-                   data to be written, and a 32-bit unsigned int that is
-                   the number of bytes to be written.  The new write
-                   function should call png_error(png_ptr, "Error msg")
-                   to exit and output any fatal error messages.
-   flush_data_fn - pointer to a new flush function that takes as its
-                   arguments a pointer to a png_struct.  After a call to
-                   the flush function, there should be no data in any buffers
-                   or pending transmission.  If the output method doesn't do
-                   any buffering of ouput, a function prototype must still be
-                   supplied although it doesn't have to do anything.  If
-                   PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile
-                   time, output_flush_fn will be ignored, although it must be
-                   supplied for compatibility. */
+ * libpng if standard C streams aren't being used.
+ *
+ * This function takes as its arguments:
+ * png_ptr       - pointer to a png output data structure
+ * io_ptr        - pointer to user supplied structure containing info about
+ *                 the output functions.  May be NULL.
+ * write_data_fn - pointer to a new output function that takes as its
+ *                 arguments a pointer to a png_struct, a pointer to
+ *                 data to be written, and a 32-bit unsigned int that is
+ *                 the number of bytes to be written.  The new write
+ *                 function should call png_error(png_ptr, "Error msg")
+ *                 to exit and output any fatal error messages.  May be
+ *                 NULL, in which case libpng's default function will
+ *                 be used.
+ * flush_data_fn - pointer to a new flush function that takes as its
+ *                 arguments a pointer to a png_struct.  After a call to
+ *                 the flush function, there should be no data in any buffers
+ *                 or pending transmission.  If the output method doesn't do
+ *                 any buffering of ouput, a function prototype must still be
+ *                 supplied although it doesn't have to do anything.  If
+ *                 PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile
+ *                 time, output_flush_fn will be ignored, although it must be
+ *                 supplied for compatibility.  May be NULL, in which case
+ *                 libpng's default function will be used, if
+ *                 PNG_WRITE_FLUSH_SUPPORTED is defined.  This is not
+ *                 a good idea if io_ptr does not point to a standard
+ *                 *FILE structure.
+ */
 void PNGAPI
 png_set_write_fn(png_structp png_ptr, png_voidp io_ptr,
    png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)
 {
-   if (png_ptr == NULL) return;
+   if (png_ptr == NULL)
+      return;
+
    png_ptr->io_ptr = io_ptr;
 
 #if !defined(PNG_NO_STDIO)
    if (write_data_fn != NULL)
       png_ptr->write_data_fn = write_data_fn;
+
    else
       png_ptr->write_data_fn = png_default_write_data;
 #else
@@ -186,6 +206,7 @@ png_set_write_fn(png_structp png_ptr, png_voidp io_ptr,
 #if !defined(PNG_NO_STDIO)
    if (output_flush_fn != NULL)
       png_ptr->output_flush_fn = output_flush_fn;
+
    else
       png_ptr->output_flush_fn = png_default_flush;
 #else
@@ -212,9 +233,11 @@ void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check)
    void FAR *far_ptr;
    FP_OFF(near_ptr) = FP_OFF(ptr);
    far_ptr = (void FAR *)near_ptr;
+
    if (check != 0)
       if (FP_SEG(ptr) != FP_SEG(far_ptr))
          png_error(png_ptr, "segment lost in conversion");
+
    return(near_ptr);
 }
 #  else
@@ -224,9 +247,11 @@ void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check)
    void FAR *far_ptr;
    near_ptr = (void FAR *)ptr;
    far_ptr = (void FAR *)near_ptr;
+
    if (check != 0)
       if (far_ptr != ptr)
          png_error(png_ptr, "segment lost in conversion");
+
    return(near_ptr);
 }
 #   endif

pngwrite.c

@@ -1,14 +1,17 @@
 
 /* pngwrite.c - general routines to write a PNG file
  *
- * Last changed in libpng 1.2.31 [August 19, 2008]
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2008 Glenn Randers-Pehrson
+ * Last changed in libpng 1.2.37 [June 4, 2009]
+ * Copyright (c) 1998-2009 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 code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
  */
 
-/* get internal access to png.h */
+/* Get internal access to png.h */
 #define PNG_INTERNAL
 #include "png.h"
 #ifdef PNG_WRITE_SUPPORTED
@@ -25,12 +28,12 @@
 void PNGAPI
 png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
 {
-   png_debug(1, "in png_write_info_before_PLTE\n");
+   png_debug(1, "in png_write_info_before_PLTE");
    if (png_ptr == NULL || info_ptr == NULL)
       return;
    if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
    {
-   png_write_sig(png_ptr); /* write PNG signature */
+   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))
    {
@@ -38,7 +41,7 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
       png_ptr->mng_features_permitted=0;
    }
 #endif
-   /* write IHDR information. */
+   /* 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,
       info_ptr->filter_type,
@@ -47,8 +50,9 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
 #else
       0);
 #endif
-   /* the rest of these check to see if the valid field has the appropriate
-      flag set, and if it does, writes the chunk. */
+   /* The rest of these check to see if the valid field has the appropriate
+    * flag set, and if it does, writes the chunk.
+    */
 #if defined(PNG_WRITE_gAMA_SUPPORTED)
    if (info_ptr->valid & PNG_INFO_gAMA)
    {
@@ -97,14 +101,14 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
 #if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
    if (info_ptr->unknown_chunks_num)
    {
-       png_unknown_chunk *up;
+      png_unknown_chunk *up;
 
-       png_debug(5, "writing extra chunks\n");
+      png_debug(5, "writing extra chunks");
 
-       for (up = info_ptr->unknown_chunks;
-            up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
-            up++)
-       {
+      for (up = info_ptr->unknown_chunks;
+           up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
+           up++)
+      {
          int keep=png_handle_as_unknown(png_ptr, up->name);
          if (keep != PNG_HANDLE_CHUNK_NEVER &&
             up->location && !(up->location & PNG_HAVE_PLTE) &&
@@ -116,7 +120,7 @@ png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
                png_warning(png_ptr, "Writing zero-length unknown chunk");
             png_write_chunk(png_ptr, up->name, up->data, up->size);
          }
-       }
+      }
    }
 #endif
       png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;
@@ -130,7 +134,7 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
    int i;
 #endif
 
-   png_debug(1, "in png_write_info\n");
+   png_debug(1, "in png_write_info");
 
    if (png_ptr == NULL || info_ptr == NULL)
       return;
@@ -145,20 +149,20 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
 
 #if defined(PNG_WRITE_tRNS_SUPPORTED)
    if (info_ptr->valid & PNG_INFO_tRNS)
-      {
+   {
 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
-         /* invert the alpha channel (in tRNS) */
-         if ((png_ptr->transformations & PNG_INVERT_ALPHA) &&
-            info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
-         {
-            int j;
-            for (j=0; j<(int)info_ptr->num_trans; j++)
-               info_ptr->trans[j] = (png_byte)(255 - info_ptr->trans[j]);
-         }
+      /* Invert the alpha channel (in tRNS) */
+      if ((png_ptr->transformations & PNG_INVERT_ALPHA) &&
+         info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+      {
+         int j;
+         for (j=0; j<(int)info_ptr->num_trans; j++)
+            info_ptr->trans[j] = (png_byte)(255 - info_ptr->trans[j]);
+      }
 #endif
       png_write_tRNS(png_ptr, info_ptr->trans, &(info_ptr->trans_values),
          info_ptr->num_trans, info_ptr->color_type);
-      }
+   }
 #endif
 #if defined(PNG_WRITE_bKGD_SUPPORTED)
    if (info_ptr->valid & PNG_INFO_bKGD)
@@ -179,49 +183,56 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
          info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams,
          info_ptr->pcal_units, info_ptr->pcal_params);
 #endif
-#if defined(PNG_WRITE_sCAL_SUPPORTED)
+
+#if defined(PNG_sCAL_SUPPORTED)
    if (info_ptr->valid & PNG_INFO_sCAL)
+#if defined(PNG_WRITE_sCAL_SUPPORTED)
 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
       png_write_sCAL(png_ptr, (int)info_ptr->scal_unit,
           info_ptr->scal_pixel_width, info_ptr->scal_pixel_height);
-#else
+#else /* !FLOATING_POINT */
 #ifdef PNG_FIXED_POINT_SUPPORTED
       png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit,
           info_ptr->scal_s_width, info_ptr->scal_s_height);
-#else
+#endif /* FIXED_POINT */
+#endif /* FLOATING_POINT */
+#else  /* !WRITE_sCAL */
       png_warning(png_ptr,
           "png_write_sCAL not supported; sCAL chunk not written.");
-#endif
-#endif
-#endif
+#endif /* WRITE_sCAL */
+#endif /* sCAL */
+
 #if defined(PNG_WRITE_pHYs_SUPPORTED)
    if (info_ptr->valid & PNG_INFO_pHYs)
       png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit,
          info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type);
-#endif
+#endif /* pHYs */
+
 #if defined(PNG_WRITE_tIME_SUPPORTED)
    if (info_ptr->valid & PNG_INFO_tIME)
    {
       png_write_tIME(png_ptr, &(info_ptr->mod_time));
       png_ptr->mode |= PNG_WROTE_tIME;
    }
-#endif
+#endif /* tIME */
+
 #if defined(PNG_WRITE_sPLT_SUPPORTED)
    if (info_ptr->valid & PNG_INFO_sPLT)
      for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
        png_write_sPLT(png_ptr, info_ptr->splt_palettes + i);
-#endif
+#endif /* sPLT */
+
 #if defined(PNG_WRITE_TEXT_SUPPORTED)
    /* Check to see if we need to write text chunks */
    for (i = 0; i < info_ptr->num_text; i++)
    {
-      png_debug2(2, "Writing header text chunk %d, type %d\n", i,
+      png_debug2(2, "Writing header text chunk %d, type %d", i,
          info_ptr->text[i].compression);
-      /* an internationalized chunk? */
+      /* An internationalized chunk? */
       if (info_ptr->text[i].compression > 0)
       {
 #if defined(PNG_WRITE_iTXt_SUPPORTED)
-          /* write international chunk */
+          /* Write international chunk */
           png_write_iTXt(png_ptr,
                          info_ptr->text[i].compression,
                          info_ptr->text[i].key,
@@ -238,7 +249,7 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
       else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt)
       {
 #if defined(PNG_WRITE_zTXt_SUPPORTED)
-         /* write compressed chunk */
+         /* Write compressed chunk */
          png_write_zTXt(png_ptr, info_ptr->text[i].key,
             info_ptr->text[i].text, 0,
             info_ptr->text[i].compression);
@@ -251,24 +262,26 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
       else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
       {
 #if defined(PNG_WRITE_tEXt_SUPPORTED)
-         /* write uncompressed chunk */
+         /* Write uncompressed chunk */
          png_write_tEXt(png_ptr, info_ptr->text[i].key,
                          info_ptr->text[i].text,
                          0);
-#else
-         png_warning(png_ptr, "Unable to write uncompressed text");
-#endif
          /* Mark this chunk as written */
          info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
+#else
+         /* Can't get here */
+         png_warning(png_ptr, "Unable to write uncompressed text");
+#endif
       }
    }
-#endif
+#endif /* tEXt */
+
 #if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
    if (info_ptr->unknown_chunks_num)
    {
        png_unknown_chunk *up;
 
-       png_debug(5, "writing extra chunks\n");
+       png_debug(5, "writing extra chunks");
 
        for (up = info_ptr->unknown_chunks;
             up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
@@ -296,35 +309,35 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
 void PNGAPI
 png_write_end(png_structp png_ptr, png_infop info_ptr)
 {
-   png_debug(1, "in png_write_end\n");
+   png_debug(1, "in png_write_end");
    if (png_ptr == NULL)
       return;
    if (!(png_ptr->mode & PNG_HAVE_IDAT))
       png_error(png_ptr, "No IDATs written into file");
 
-   /* see if user wants us to write information chunks */
+   /* See if user wants us to write information chunks */
    if (info_ptr != NULL)
    {
 #if defined(PNG_WRITE_TEXT_SUPPORTED)
-      int i; /* local index variable */
+      int i; /* Local index variable */
 #endif
 #if defined(PNG_WRITE_tIME_SUPPORTED)
-      /* check to see if user has supplied a time chunk */
+      /* Check to see if user has supplied a time chunk */
       if ((info_ptr->valid & PNG_INFO_tIME) &&
          !(png_ptr->mode & PNG_WROTE_tIME))
          png_write_tIME(png_ptr, &(info_ptr->mod_time));
 #endif
 #if defined(PNG_WRITE_TEXT_SUPPORTED)
-      /* loop through comment chunks */
+      /* Loop through comment chunks */
       for (i = 0; i < info_ptr->num_text; i++)
       {
-         png_debug2(2, "Writing trailer text chunk %d, type %d\n", i,
+         png_debug2(2, "Writing trailer text chunk %d, type %d", i,
             info_ptr->text[i].compression);
-         /* an internationalized chunk? */
+         /* An internationalized chunk? */
          if (info_ptr->text[i].compression > 0)
          {
 #if defined(PNG_WRITE_iTXt_SUPPORTED)
-             /* write international chunk */
+             /* Write international chunk */
              png_write_iTXt(png_ptr,
                          info_ptr->text[i].compression,
                          info_ptr->text[i].key,
@@ -340,7 +353,7 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
          else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
          {
 #if defined(PNG_WRITE_zTXt_SUPPORTED)
-            /* write compressed chunk */
+            /* Write compressed chunk */
             png_write_zTXt(png_ptr, info_ptr->text[i].key,
                info_ptr->text[i].text, 0,
                info_ptr->text[i].compression);
@@ -353,7 +366,7 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
          else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
          {
 #if defined(PNG_WRITE_tEXt_SUPPORTED)
-            /* write uncompressed chunk */
+            /* Write uncompressed chunk */
             png_write_tEXt(png_ptr, info_ptr->text[i].key,
                info_ptr->text[i].text, 0);
 #else
@@ -370,7 +383,7 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
    {
        png_unknown_chunk *up;
 
-       png_debug(5, "writing extra chunks\n");
+       png_debug(5, "writing extra chunks");
 
        for (up = info_ptr->unknown_chunks;
             up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
@@ -391,7 +404,7 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
 
    png_ptr->mode |= PNG_AFTER_IDAT;
 
-   /* write end of PNG file */
+   /* Write end of PNG file */
    png_write_IEND(png_ptr);
    /* This flush, added in libpng-1.0.8, removed from libpng-1.0.9beta03,
     * and restored again in libpng-1.2.30, may cause some applications that
@@ -413,7 +426,7 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
 void PNGAPI
 png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime)
 {
-   png_debug(1, "in png_convert_from_struct_tm\n");
+   png_debug(1, "in png_convert_from_struct_tm");
    ptime->year = (png_uint_16)(1900 + ttime->tm_year);
    ptime->month = (png_byte)(ttime->tm_mon + 1);
    ptime->day = (png_byte)ttime->tm_mday;
@@ -427,7 +440,7 @@ png_convert_from_time_t(png_timep ptime, time_t ttime)
 {
    struct tm *tbuf;
 
-   png_debug(1, "in png_convert_from_time_t\n");
+   png_debug(1, "in png_convert_from_time_t");
    tbuf = gmtime(&ttime);
    png_convert_from_struct_tm(ptime, tbuf);
 }
@@ -461,7 +474,7 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
 #endif
 #endif
    int i;
-   png_debug(1, "in png_create_write_struct\n");
+   png_debug(1, "in png_create_write_struct");
 #ifdef PNG_USER_MEM_SUPPORTED
    png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
       (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
@@ -471,7 +484,7 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
    if (png_ptr == NULL)
       return (NULL);
 
-   /* added at libpng-1.2.6 */
+   /* Added at libpng-1.2.6 */
 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
    png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
    png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
@@ -542,7 +555,7 @@ png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
      }
    }
 
-   /* initialize zbuf - compression buffer */
+   /* 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);
@@ -636,7 +649,7 @@ png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
 {
    png_structp png_ptr=*ptr_ptr;
 #ifdef PNG_SETJMP_SUPPORTED
-   jmp_buf tmp_jmp; /* to save current jump buffer */
+   jmp_buf tmp_jmp; /* To save current jump buffer */
 #endif
 
    int i = 0;
@@ -659,10 +672,10 @@ png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
      }
    } while (png_libpng_ver[i++]);
 
-   png_debug(1, "in png_write_init_3\n");
+   png_debug(1, "in png_write_init_3");
 
 #ifdef PNG_SETJMP_SUPPORTED
-   /* save jump buffer and error functions */
+   /* Save jump buffer and error functions */
    png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
 #endif
 
@@ -673,24 +686,24 @@ png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
        *ptr_ptr = png_ptr;
      }
 
-   /* reset all variables to 0 */
+   /* Reset all variables to 0 */
    png_memset(png_ptr, 0, png_sizeof(png_struct));
 
-   /* added at libpng-1.2.6 */
+   /* Added at libpng-1.2.6 */
 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
    png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
    png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
 #endif
 
 #ifdef PNG_SETJMP_SUPPORTED
-   /* restore jump buffer */
+   /* Restore jump buffer */
    png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_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 */
+   /* 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);
@@ -710,15 +723,15 @@ void PNGAPI
 png_write_rows(png_structp png_ptr, png_bytepp row,
    png_uint_32 num_rows)
 {
-   png_uint_32 i; /* row counter */
-   png_bytepp rp; /* row pointer */
+   png_uint_32 i; /* Row counter */
+   png_bytepp rp; /* Row pointer */
 
-   png_debug(1, "in png_write_rows\n");
+   png_debug(1, "in png_write_rows");
 
    if (png_ptr == NULL)
       return;
 
-   /* loop through the rows */
+   /* Loop through the rows */
    for (i = 0, rp = row; i < num_rows; i++, rp++)
    {
       png_write_row(png_ptr, *rp);
@@ -731,25 +744,26 @@ png_write_rows(png_structp png_ptr, png_bytepp row,
 void PNGAPI
 png_write_image(png_structp png_ptr, png_bytepp image)
 {
-   png_uint_32 i; /* row index */
-   int pass, num_pass; /* pass variables */
-   png_bytepp rp; /* points to current row */
+   png_uint_32 i; /* Row index */
+   int pass, num_pass; /* Pass variables */
+   png_bytepp rp; /* Points to current row */
 
    if (png_ptr == NULL)
       return;
 
-   png_debug(1, "in png_write_image\n");
+   png_debug(1, "in png_write_image");
 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
-   /* intialize interlace handling.  If image is not interlaced,
-      this will set pass to 1 */
+   /* Initialize interlace handling.  If image is not interlaced,
+    * this will set pass to 1
+    */
    num_pass = png_set_interlace_handling(png_ptr);
 #else
    num_pass = 1;
 #endif
-   /* loop through passes */
+   /* Loop through passes */
    for (pass = 0; pass < num_pass; pass++)
    {
-      /* loop through image */
+      /* Loop through image */
       for (i = 0, rp = image; i < png_ptr->height; i++, rp++)
       {
          png_write_row(png_ptr, *rp);
@@ -757,58 +771,58 @@ png_write_image(png_structp png_ptr, png_bytepp image)
    }
 }
 
-/* called by user to write a row of image data */
+/* Called by user to write a row of image data */
 void PNGAPI
 png_write_row(png_structp png_ptr, png_bytep row)
 {
    if (png_ptr == NULL)
       return;
-   png_debug2(1, "in png_write_row (row %ld, pass %d)\n",
+   png_debug2(1, "in png_write_row (row %ld, pass %d)",
       png_ptr->row_number, png_ptr->pass);
 
-   /* initialize transformations and other stuff if first time */
+   /* Initialize transformations and other stuff if first time */
    if (png_ptr->row_number == 0 && png_ptr->pass == 0)
    {
-   /* make sure we wrote the header info */
-   if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
-      png_error(png_ptr,
-         "png_write_info was never called before png_write_row.");
+      /* Make sure we wrote the header info */
+      if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
+         png_error(png_ptr,
+            "png_write_info was never called before png_write_row.");
 
-   /* check for transforms that have been set but were defined out */
+      /* Check for transforms that have been set but were defined out */
 #if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED)
-   if (png_ptr->transformations & PNG_INVERT_MONO)
-      png_warning(png_ptr, "PNG_WRITE_INVERT_SUPPORTED is not defined.");
+      if (png_ptr->transformations & PNG_INVERT_MONO)
+         png_warning(png_ptr, "PNG_WRITE_INVERT_SUPPORTED is not defined.");
 #endif
 #if !defined(PNG_WRITE_FILLER_SUPPORTED) && defined(PNG_READ_FILLER_SUPPORTED)
-   if (png_ptr->transformations & PNG_FILLER)
-      png_warning(png_ptr, "PNG_WRITE_FILLER_SUPPORTED is not defined.");
+      if (png_ptr->transformations & PNG_FILLER)
+         png_warning(png_ptr, "PNG_WRITE_FILLER_SUPPORTED is not defined.");
 #endif
 #if !defined(PNG_WRITE_PACKSWAP_SUPPORTED) && defined(PNG_READ_PACKSWAP_SUPPORTED)
-   if (png_ptr->transformations & PNG_PACKSWAP)
-      png_warning(png_ptr, "PNG_WRITE_PACKSWAP_SUPPORTED is not defined.");
+      if (png_ptr->transformations & PNG_PACKSWAP)
+         png_warning(png_ptr, "PNG_WRITE_PACKSWAP_SUPPORTED is not defined.");
 #endif
 #if !defined(PNG_WRITE_PACK_SUPPORTED) && defined(PNG_READ_PACK_SUPPORTED)
-   if (png_ptr->transformations & PNG_PACK)
-      png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined.");
+      if (png_ptr->transformations & PNG_PACK)
+         png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined.");
 #endif
 #if !defined(PNG_WRITE_SHIFT_SUPPORTED) && defined(PNG_READ_SHIFT_SUPPORTED)
-   if (png_ptr->transformations & PNG_SHIFT)
-      png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined.");
+      if (png_ptr->transformations & PNG_SHIFT)
+         png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined.");
 #endif
 #if !defined(PNG_WRITE_BGR_SUPPORTED) && defined(PNG_READ_BGR_SUPPORTED)
-   if (png_ptr->transformations & PNG_BGR)
-      png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined.");
+      if (png_ptr->transformations & PNG_BGR)
+         png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined.");
 #endif
 #if !defined(PNG_WRITE_SWAP_SUPPORTED) && defined(PNG_READ_SWAP_SUPPORTED)
-   if (png_ptr->transformations & PNG_SWAP_BYTES)
-      png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined.");
+      if (png_ptr->transformations & PNG_SWAP_BYTES)
+         png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined.");
 #endif
 
       png_write_start_row(png_ptr);
    }
 
 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
-   /* if interlaced and not interested in row, return */
+   /* If interlaced and not interested in row, return */
    if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
    {
       switch (png_ptr->pass)
@@ -866,7 +880,7 @@ png_write_row(png_structp png_ptr, png_bytep row)
    }
 #endif
 
-   /* set up row info for transformations */
+   /* Set up row info for transformations */
    png_ptr->row_info.color_type = png_ptr->color_type;
    png_ptr->row_info.width = png_ptr->usr_width;
    png_ptr->row_info.channels = png_ptr->usr_channels;
@@ -877,25 +891,25 @@ png_write_row(png_structp png_ptr, png_bytep row)
    png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
       png_ptr->row_info.width);
 
-   png_debug1(3, "row_info->color_type = %d\n", png_ptr->row_info.color_type);
-   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 = %lu\n", png_ptr->row_info.rowbytes);
+   png_debug1(3, "row_info->color_type = %d", png_ptr->row_info.color_type);
+   png_debug1(3, "row_info->width = %lu", png_ptr->row_info.width);
+   png_debug1(3, "row_info->channels = %d", png_ptr->row_info.channels);
+   png_debug1(3, "row_info->bit_depth = %d", png_ptr->row_info.bit_depth);
+   png_debug1(3, "row_info->pixel_depth = %d", png_ptr->row_info.pixel_depth);
+   png_debug1(3, "row_info->rowbytes = %lu", 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,
       png_ptr->row_info.rowbytes);
 
 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
-   /* handle interlacing */
+   /* Handle interlacing */
    if (png_ptr->interlaced && png_ptr->pass < 6 &&
       (png_ptr->transformations & PNG_INTERLACE))
    {
       png_do_write_interlace(&(png_ptr->row_info),
          png_ptr->row_buf + 1, png_ptr->pass);
-      /* this should always get caught above, but still ... */
+      /* This should always get caught above, but still ... */
       if (!(png_ptr->row_info.width))
       {
          png_write_finish_row(png_ptr);
@@ -904,7 +918,7 @@ png_write_row(png_structp png_ptr, png_bytep row)
    }
 #endif
 
-   /* handle other transformations */
+   /* Handle other transformations */
    if (png_ptr->transformations)
       png_do_write_transformations(png_ptr);
 
@@ -938,34 +952,34 @@ png_write_row(png_structp png_ptr, png_bytep row)
 void PNGAPI
 png_set_flush(png_structp png_ptr, int nrows)
 {
-   png_debug(1, "in png_set_flush\n");
+   png_debug(1, "in png_set_flush");
    if (png_ptr == NULL)
       return;
    png_ptr->flush_dist = (nrows < 0 ? 0 : nrows);
 }
 
-/* flush the current output buffers now */
+/* Flush the current output buffers now */
 void PNGAPI
 png_write_flush(png_structp png_ptr)
 {
    int wrote_IDAT;
 
-   png_debug(1, "in png_write_flush\n");
+   png_debug(1, "in png_write_flush");
    if (png_ptr == NULL)
       return;
    /* We have already written out all of the data */
    if (png_ptr->row_number >= png_ptr->num_rows)
-     return;
+      return;
 
    do
    {
       int ret;
 
-      /* compress the data */
+      /* Compress the data */
       ret = deflate(&png_ptr->zstream, Z_SYNC_FLUSH);
       wrote_IDAT = 0;
 
-      /* check for compression errors */
+      /* Check for compression errors */
       if (ret != Z_OK)
       {
          if (png_ptr->zstream.msg != NULL)
@@ -976,7 +990,7 @@ png_write_flush(png_structp png_ptr)
 
       if (!(png_ptr->zstream.avail_out))
       {
-         /* write the IDAT and reset the zlib output buffer */
+         /* Write the IDAT and reset the zlib output buffer */
          png_write_IDAT(png_ptr, png_ptr->zbuf,
                         png_ptr->zbuf_size);
          png_ptr->zstream.next_out = png_ptr->zbuf;
@@ -988,7 +1002,7 @@ png_write_flush(png_structp png_ptr)
    /* If there is any data left to be output, write it into a new IDAT */
    if (png_ptr->zbuf_size != png_ptr->zstream.avail_out)
    {
-      /* write the IDAT and reset the zlib output buffer */
+      /* Write the IDAT and reset the zlib output buffer */
       png_write_IDAT(png_ptr, png_ptr->zbuf,
                      png_ptr->zbuf_size - png_ptr->zstream.avail_out);
       png_ptr->zstream.next_out = png_ptr->zbuf;
@@ -999,7 +1013,7 @@ png_write_flush(png_structp png_ptr)
 }
 #endif /* PNG_WRITE_FLUSH_SUPPORTED */
 
-/* free all memory used by the write */
+/* Free all memory used by the write */
 void PNGAPI
 png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
 {
@@ -1010,7 +1024,7 @@ png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
    png_voidp mem_ptr = NULL;
 #endif
 
-   png_debug(1, "in png_destroy_write_struct\n");
+   png_debug(1, "in png_destroy_write_struct");
    if (png_ptr_ptr != NULL)
    {
       png_ptr = *png_ptr_ptr;
@@ -1075,7 +1089,7 @@ void /* PRIVATE */
 png_write_destroy(png_structp png_ptr)
 {
 #ifdef PNG_SETJMP_SUPPORTED
-   jmp_buf tmp_jmp; /* save jump buffer */
+   jmp_buf tmp_jmp; /* Save jump buffer */
 #endif
    png_error_ptr error_fn;
    png_error_ptr warning_fn;
@@ -1084,11 +1098,11 @@ png_write_destroy(png_structp png_ptr)
    png_free_ptr free_fn;
 #endif
 
-   png_debug(1, "in png_write_destroy\n");
-   /* free any memory zlib uses */
+   png_debug(1, "in png_write_destroy");
+   /* Free any memory zlib uses */
    deflateEnd(&png_ptr->zstream);
 
-   /* free our memory.  png_free checks NULL for us. */
+   /* Free our memory.  png_free checks NULL for us. */
    png_free(png_ptr, png_ptr->zbuf);
    png_free(png_ptr, png_ptr->row_buf);
 #ifndef PNG_NO_WRITE_FILTER
@@ -1112,7 +1126,7 @@ png_write_destroy(png_structp png_ptr)
 #endif
 
 #ifdef PNG_SETJMP_SUPPORTED
-   /* reset structure */
+   /* Reset structure */
    png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
 #endif
 
@@ -1141,7 +1155,7 @@ png_write_destroy(png_structp png_ptr)
 void PNGAPI
 png_set_filter(png_structp png_ptr, int method, int filters)
 {
-   png_debug(1, "in png_set_filter\n");
+   png_debug(1, "in png_set_filter");
    if (png_ptr == NULL)
       return;
 #if defined(PNG_MNG_FEATURES_SUPPORTED)
@@ -1264,7 +1278,7 @@ png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
 {
    int i;
 
-   png_debug(1, "in png_set_filter_heuristics\n");
+   png_debug(1, "in png_set_filter_heuristics");
    if (png_ptr == NULL)
       return;
    if (heuristic_method >= PNG_FILTER_HEURISTIC_LAST)
@@ -1378,7 +1392,7 @@ png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
 void PNGAPI
 png_set_compression_level(png_structp png_ptr, int level)
 {
-   png_debug(1, "in png_set_compression_level\n");
+   png_debug(1, "in png_set_compression_level");
    if (png_ptr == NULL)
       return;
    png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_LEVEL;
@@ -1388,7 +1402,7 @@ png_set_compression_level(png_structp png_ptr, int level)
 void PNGAPI
 png_set_compression_mem_level(png_structp png_ptr, int mem_level)
 {
-   png_debug(1, "in png_set_compression_mem_level\n");
+   png_debug(1, "in png_set_compression_mem_level");
    if (png_ptr == NULL)
       return;
    png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL;
@@ -1398,7 +1412,7 @@ png_set_compression_mem_level(png_structp png_ptr, int mem_level)
 void PNGAPI
 png_set_compression_strategy(png_structp png_ptr, int strategy)
 {
-   png_debug(1, "in png_set_compression_strategy\n");
+   png_debug(1, "in png_set_compression_strategy");
    if (png_ptr == NULL)
       return;
    png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY;
@@ -1415,7 +1429,7 @@ png_set_compression_window_bits(png_structp png_ptr, int window_bits)
    else if (window_bits < 8)
       png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");
 #ifndef WBITS_8_OK
-   /* avoid libpng bug with 256-byte windows */
+   /* Avoid libpng bug with 256-byte windows */
    if (window_bits == 8)
      {
        png_warning(png_ptr, "Compression window is being reset to 512");
@@ -1429,7 +1443,7 @@ png_set_compression_window_bits(png_structp png_ptr, int window_bits)
 void PNGAPI
 png_set_compression_method(png_structp png_ptr, int method)
 {
-   png_debug(1, "in png_set_compression_method\n");
+   png_debug(1, "in png_set_compression_method");
    if (png_ptr == NULL)
       return;
    if (method != 8)
@@ -1451,7 +1465,7 @@ void PNGAPI
 png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
    write_user_transform_fn)
 {
-   png_debug(1, "in png_set_write_user_transform_fn\n");
+   png_debug(1, "in png_set_write_user_transform_fn");
    if (png_ptr == NULL)
       return;
    png_ptr->transformations |= PNG_USER_TRANSFORM;
@@ -1468,9 +1482,9 @@ png_write_png(png_structp png_ptr, png_infop info_ptr,
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
-   /* invert the alpha channel from opacity to transparency */
+   /* Invert the alpha channel from opacity to transparency */
    if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
-       png_set_invert_alpha(png_ptr);
+      png_set_invert_alpha(png_ptr);
 #endif
 
    /* Write the file header information. */
@@ -1479,9 +1493,9 @@ png_write_png(png_structp png_ptr, png_infop info_ptr,
    /* ------ these transformations don't touch the info structure ------- */
 
 #if defined(PNG_WRITE_INVERT_SUPPORTED)
-   /* invert monochrome pixels */
+   /* Invert monochrome pixels */
    if (transforms & PNG_TRANSFORM_INVERT_MONO)
-       png_set_invert_mono(png_ptr);
+      png_set_invert_mono(png_ptr);
 #endif
 
 #if defined(PNG_WRITE_SHIFT_SUPPORTED)
@@ -1490,57 +1504,57 @@ png_write_png(png_structp png_ptr, png_infop info_ptr,
     */
    if ((transforms & PNG_TRANSFORM_SHIFT)
                && (info_ptr->valid & PNG_INFO_sBIT))
-       png_set_shift(png_ptr, &info_ptr->sig_bit);
+      png_set_shift(png_ptr, &info_ptr->sig_bit);
 #endif
 
 #if defined(PNG_WRITE_PACK_SUPPORTED)
-   /* pack pixels into bytes */
+   /* Pack pixels into bytes */
    if (transforms & PNG_TRANSFORM_PACKING)
        png_set_packing(png_ptr);
 #endif
 
 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
-   /* swap location of alpha bytes from ARGB to RGBA */
+   /* Swap location of alpha bytes from ARGB to RGBA */
    if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
-       png_set_swap_alpha(png_ptr);
+      png_set_swap_alpha(png_ptr);
 #endif
 
 #if defined(PNG_WRITE_FILLER_SUPPORTED)
-   /* Get rid of filler (OR ALPHA) bytes, pack XRGB/RGBX/ARGB/RGBA into
-    * RGB (4 channels -> 3 channels). The second parameter is not used.
-    */
-   if (transforms & PNG_TRANSFORM_STRIP_FILLER)
-       png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
+   /* Pack XRGB/RGBX/ARGB/RGBA into * RGB (4 channels -> 3 channels) */
+   if (transforms & PNG_TRANSFORM_STRIP_FILLER_AFTER)
+      png_set_filler(png_ptr, 0, PNG_FILLER_AFTER);
+   else if (transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE)
+      png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
 #endif
 
 #if defined(PNG_WRITE_BGR_SUPPORTED)
-   /* flip BGR pixels to RGB */
+   /* Flip BGR pixels to RGB */
    if (transforms & PNG_TRANSFORM_BGR)
-       png_set_bgr(png_ptr);
+      png_set_bgr(png_ptr);
 #endif
 
 #if defined(PNG_WRITE_SWAP_SUPPORTED)
-   /* swap bytes of 16-bit files to most significant byte first */
+   /* Swap bytes of 16-bit files to most significant byte first */
    if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
-       png_set_swap(png_ptr);
+      png_set_swap(png_ptr);
 #endif
 
 #if defined(PNG_WRITE_PACKSWAP_SUPPORTED)
-   /* swap bits of 1, 2, 4 bit packed pixel formats */
+   /* Swap bits of 1, 2, 4 bit packed pixel formats */
    if (transforms & PNG_TRANSFORM_PACKSWAP)
-       png_set_packswap(png_ptr);
+      png_set_packswap(png_ptr);
 #endif
 
    /* ----------------------- end of transformations ------------------- */
 
-   /* write the bits */
+   /* Write the bits */
    if (info_ptr->valid & PNG_INFO_IDAT)
        png_write_image(png_ptr, info_ptr->row_pointers);
 
    /* It is REQUIRED to call this to finish writing the rest of the file */
    png_write_end(png_ptr, info_ptr);
 
-   transforms = transforms; /* quiet compiler warnings */
+   transforms = transforms; /* Quiet compiler warnings */
    params = params;
 }
 #endif

pngwtran.c

@@ -1,11 +1,14 @@
 
 /* pngwtran.c - transforms the data in a row for PNG writers
  *
- * Last changed in libpng 1.2.9 April 14, 2006
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2006 Glenn Randers-Pehrson
+ * Last changed in libpng 1.2.37 [June 4, 2009]
+ * Copyright (c) 1998-2009 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 code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
  */
 
 #define PNG_INTERNAL
@@ -18,7 +21,7 @@
 void /* PRIVATE */
 png_do_write_transformations(png_structp png_ptr)
 {
-   png_debug(1, "in png_do_write_transformations\n");
+   png_debug(1, "in png_do_write_transformations");
 
    if (png_ptr == NULL)
       return;
@@ -26,7 +29,7 @@ png_do_write_transformations(png_structp png_ptr)
 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
    if (png_ptr->transformations & PNG_USER_TRANSFORM)
       if (png_ptr->write_user_transform_fn != NULL)
-        (*(png_ptr->write_user_transform_fn)) /* user write transform function */
+        (*(png_ptr->write_user_transform_fn)) /* User write transform function */
           (png_ptr,                    /* png_ptr */
            &(png_ptr->row_info),       /* row_info:     */
              /*  png_uint_32 width;          width of row */
@@ -86,7 +89,7 @@ png_do_write_transformations(png_structp png_ptr)
 void /* PRIVATE */
 png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
 {
-   png_debug(1, "in png_do_pack\n");
+   png_debug(1, "in png_do_pack");
    if (row_info->bit_depth == 8 &&
 #if defined(PNG_USELESS_TESTS_SUPPORTED)
        row != NULL && row_info != NULL &&
@@ -212,7 +215,7 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
 void /* PRIVATE */
 png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
 {
-   png_debug(1, "in png_do_shift\n");
+   png_debug(1, "in png_do_shift");
 #if defined(PNG_USELESS_TESTS_SUPPORTED)
    if (row != NULL && row_info != NULL &&
 #else
@@ -248,7 +251,7 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
          channels++;
       }
 
-      /* with low row depths, could only be grayscale, so one channel */
+      /* With low row depths, could only be grayscale, so one channel */
       if (row_info->bit_depth < 8)
       {
          png_bytep bp = row;
@@ -336,7 +339,7 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
 void /* PRIVATE */
 png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
 {
-   png_debug(1, "in png_do_write_swap_alpha\n");
+   png_debug(1, "in png_do_write_swap_alpha");
 #if defined(PNG_USELESS_TESTS_SUPPORTED)
    if (row != NULL && row_info != NULL)
 #endif
@@ -424,7 +427,7 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
 void /* PRIVATE */
 png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
 {
-   png_debug(1, "in png_do_write_invert_alpha\n");
+   png_debug(1, "in png_do_write_invert_alpha");
 #if defined(PNG_USELESS_TESTS_SUPPORTED)
    if (row != NULL && row_info != NULL)
 #endif
@@ -439,7 +442,7 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
             png_uint_32 row_width = row_info->width;
             for (i = 0, sp = dp = row; i < row_width; i++)
             {
-               /* does nothing
+               /* Does nothing
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
@@ -457,7 +460,7 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
 
             for (i = 0, sp = dp = row; i < row_width; i++)
             {
-               /* does nothing
+               /* Does nothing
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
@@ -495,7 +498,7 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
 
             for (i = 0, sp = dp = row; i < row_width; i++)
             {
-               /* does nothing
+               /* Does nothing
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
                */
@@ -510,11 +513,11 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
 #endif
 
 #if defined(PNG_MNG_FEATURES_SUPPORTED)
-/* undoes intrapixel differencing  */
+/* 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");
+   png_debug(1, "in png_do_write_intrapixel");
    if (
 #if defined(PNG_USELESS_TESTS_SUPPORTED)
        row != NULL && row_info != NULL &&

scripts/CMakeLists.txt

@@ -1,17 +1,24 @@
-                                             
-project(PNG)
+project(PNG C)
+cmake_minimum_required(VERSION 2.4.3)
 
 # Copyright (C) 2007 Glenn Randers-Pehrson
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 set(PNGLIB_MAJOR 1)
 set(PNGLIB_MINOR 0)
-set(PNGLIB_RELEASE 41)
+set(PNGLIB_RELEASE 50)
 set(PNGLIB_NAME libpng${PNGLIB_MAJOR}${PNGLIB_MINOR})
 set(PNGLIB_VERSION ${PNGLIB_MAJOR}.${PNGLIB_MINOR}.${PNGLIB_RELEASE})
 
+set(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS true)
+
 # needed packages
 find_package(ZLIB REQUIRED)
+include_directories(${ZLIB_INCLUDE_DIR})
+
 if(NOT WIN32)
  find_library(M_LIBRARY
      NAMES m
@@ -20,24 +27,33 @@ if(NOT WIN32)
  if(NOT M_LIBRARY)
    message(STATUS
      "math library 'libm' not found - floating point support disabled")
- endif(NOT M_LIBRARY)
-else(NOT WIN32)
+ endif()
+else()
  # not needed on windows
  set(M_LIBRARY "")
-endif(NOT WIN32)
-
+endif()
 
 # COMMAND LINE OPTIONS
-option(PNG_SHARED "Build shared lib" YES)
-option(PNG_STATIC "Build static lib" YES)
+if(DEFINED PNG_SHARED)
+  option(PNG_SHARED "Build shared lib" ${PNG_SHARED})
+else()
+  option(PNG_SHARED "Build shared lib" ON)
+endif()
+if(DEFINED PNG_STATIC)
+  option(PNG_STATIC "Build static lib" ${PNG_STATIC})
+else()
+  option(PNG_STATIC "Build static lib" ON)
+endif()
+
 if(MINGW)
   option(PNG_TESTS  "Build pngtest" NO)
 else(MINGW)
   option(PNG_TESTS  "Build pngtest" YES)
 endif(MINGW)
+
 option(PNG_NO_CONSOLE_IO "FIXME" YES)
 option(PNG_NO_STDIO      "FIXME" YES)
-option(PNG_DEBUG         "Build with debug output" YES)
+option(PNG_DEBUG         "Build with debug output" NO)
 option(PNGARG            "FIXME" YES)
 #TODO:
 # PNG_CONSOLE_IO_SUPPORTED
@@ -54,20 +70,16 @@ if(NOT WIN32)
       set(png_asm_tmp "OFF")
    endif("uname_output" MATCHES "^.*i[1-9]86.*$")
  endif(uname_executable)
-else(NOT WIN32)
+else()
  # this env var is normally only set on win64
  SET(TEXT "ProgramFiles(x86)")
  if("$ENV{${TEXT}}" STREQUAL "")
   set(png_asm_tmp "ON")
  endif("$ENV{${TEXT}}" STREQUAL "")
-endif(NOT WIN32)
+endif()
 
 # SET LIBNAME
-# msvc does not append 'lib' - do it here to have consistent name
-if(MSVC)
- set(PNG_LIB_NAME lib)
-endif(MSVC)
-set(PNG_LIB_NAME ${PNG_LIB_NAME}png${PNGLIB_MAJOR}${PNGLIB_MINOR})
+set(PNG_LIB_NAME png${PNGLIB_MAJOR}${PNGLIB_MINOR})
 
 # to distinguish between debug and release lib
 set(CMAKE_DEBUG_POSTFIX "d")
@@ -101,54 +113,67 @@ if(MSVC)
   add_definitions(-DPNG_NO_MODULEDEF -D_CRT_SECURE_NO_DEPRECATE)
 endif(MSVC)
 
-add_definitions(-DZLIB_DLL)
+if(PNG_SHARED OR  NOT MSVC)
+	#if building msvc static this has NOT do be defined
+	add_definitions(-DZLIB_DLL)
+endif()
 
 add_definitions(-DLIBPNG_NO_MMX)
 add_definitions(-DPNG_NO_MMX_CODE)
 
 if(PNG_CONSOLE_IO_SUPPORTED)
  add_definitions(-DPNG_CONSOLE_IO_SUPPORTED)
-endif(PNG_CONSOLE_IO_SUPPORTED)
+endif()
 
 if(PNG_NO_CONSOLE_IO)
  add_definitions(-DPNG_NO_CONSOLE_IO)
-endif(PNG_NO_CONSOLE_IO)
+endif()
 
 if(PNG_NO_STDIO)
  add_definitions(-DPNG_NO_STDIO)
-endif(PNG_NO_STDIO)
+endif()
 
 if(PNG_DEBUG)
  add_definitions(-DPNG_DEBUG)
-endif(PNG_DEBUG)
+endif()
 
 if(NOT M_LIBRARY AND NOT WIN32)
  add_definitions(-DPNG_NO_FLOATING_POINT_SUPPORTED)
-endif(NOT M_LIBRARY AND NOT WIN32)
+endif()
 
 # NOW BUILD OUR TARGET
 include_directories(${PNG_SOURCE_DIR} ${ZLIB_INCLUDE_DIR})
 
 if(PNG_SHARED)
  add_library(${PNG_LIB_NAME} SHARED ${libpng_sources})
+ if(MSVC)
+   # msvc does not append 'lib' - do it here to have consistent name
+   set_target_properties(${PNG_LIB_NAME} PROPERTIES PREFIX "lib")
+ endif()
  target_link_libraries(${PNG_LIB_NAME} ${ZLIB_LIBRARY} ${M_LIBRARY})
-endif(PNG_SHARED)
+endif()
+
 if(PNG_STATIC)
 # does not work without changing name
  set(PNG_LIB_NAME_STATIC ${PNG_LIB_NAME}_static)
  add_library(${PNG_LIB_NAME_STATIC} STATIC ${libpng_sources})
-endif(PNG_STATIC)
+ if(MSVC)
+   # msvc does not append 'lib' - do it here to have consistent name
+   set_target_properties(${PNG_LIB_NAME_STATIC} PROPERTIES PREFIX "lib")
+ endif()
+endif()
+
 
 if(PNG_SHARED AND WIN32)
  set_target_properties(${PNG_LIB_NAME} PROPERTIES DEFINE_SYMBOL PNG_BUILD_DLL)
-endif(PNG_SHARED AND WIN32)
+endif()
 
-if(PNG_TESTS)
+if(PNG_TESTS AND PNG_SHARED)
 # does not work with msvc due to png_lib_ver issue
  add_executable(pngtest ${pngtest_sources})
  target_link_libraries(pngtest ${PNG_LIB_NAME})
 #  add_test(pngtest ${PNG_SOURCE_DIR}/pngtest.png)
-endif(PNG_TESTS)
+endif()
 
 
 # CREATE PKGCONFIG FILES
@@ -168,31 +193,49 @@ configure_file(${PNG_SOURCE_DIR}/scripts/libpng-config.in
   ${PNG_BINARY_DIR}/${PNGLIB_NAME}-config)
 
 # SET UP LINKS
-set_target_properties(${PNG_LIB_NAME} PROPERTIES
-#    VERSION 0.${PNGLIB_RELEASE}.1.0.41
+if(PNG_SHARED)
+  set_target_properties(${PNG_LIB_NAME} PROPERTIES
+#    VERSION 0.${PNGLIB_RELEASE}.1.0.50
      VERSION 0.${PNGLIB_RELEASE}.0
      SOVERSION 0
      CLEAN_DIRECT_OUTPUT 1)
-if(NOT WIN32)
-  # that's uncool on win32 - it overwrites our static import lib...
-  set_target_properties(${PNG_LIB_NAME_STATIC} PROPERTIES
-     OUTPUT_NAME ${PNG_LIB_NAME}
-     CLEAN_DIRECT_OUTPUT 1)
-endif(NOT WIN32)
-# INSTALL
-install_targets(/lib ${PNG_LIB_NAME})
+endif()
 if(PNG_STATIC)
-  install_targets(/lib ${PNG_LIB_NAME_STATIC})
-endif(PNG_STATIC)
+  if(NOT WIN32)
+    # that's uncool on win32 - it overwrites our static import lib...
+    set_target_properties(${PNG_LIB_NAME_STATIC} PROPERTIES
+       OUTPUT_NAME ${PNG_LIB_NAME}
+       CLEAN_DIRECT_OUTPUT 1)
+  endif()
+endif()
 
+# INSTALL
+if(NOT SKIP_INSTALL_LIBRARIES AND NOT SKIP_INSTALL_ALL )
+    if(PNG_SHARED)
+        install(TARGETS ${PNG_LIB_NAME}
+            RUNTIME DESTINATION bin
+            LIBRARY DESTINATION lib
+            ARCHIVE DESTINATION lib)
+    endif()
+    if(PNG_STATIC)
+        install(TARGETS ${PNG_LIB_NAME_STATIC}
+            LIBRARY DESTINATION lib
+            ARCHIVE DESTINATION lib)
+    endif()
+endif()
+
+if(NOT SKIP_INSTALL_HEADERS AND NOT SKIP_INSTALL_ALL )
 install(FILES png.h pngconf.h         DESTINATION include)
 install(FILES png.h pngconf.h         DESTINATION include/${PNGLIB_NAME})
-install(FILES libpng.3 libpngpf.3             DESTINATION man/man3)
-install(FILES png.5                           DESTINATION man/man5)
-install(FILES ${PNG_BINARY_DIR}/libpng.pc     DESTINATION lib/pkgconfig)
-install(FILES ${PNG_BINARY_DIR}/libpng-config      DESTINATION bin)
-install(FILES ${PNG_BINARY_DIR}/${PNGLIB_NAME}.pc  DESTINATION lib/pkgconfig)
-install(FILES ${PNG_BINARY_DIR}/${PNGLIB_NAME}-config DESTINATION bin)
+endif()
+if(NOT SKIP_INSTALL_FILES AND NOT SKIP_INSTALL_ALL )
+    install(FILES libpng.3 libpngpf.3             DESTINATION man/man3)
+    install(FILES png.5                           DESTINATION man/man5)
+    install(FILES ${PNG_BINARY_DIR}/libpng.pc     DESTINATION lib/pkgconfig)
+    install(FILES ${PNG_BINARY_DIR}/libpng-config      DESTINATION bin)
+    install(FILES ${PNG_BINARY_DIR}/${PNGLIB_NAME}.pc  DESTINATION lib/pkgconfig)
+    install(FILES ${PNG_BINARY_DIR}/${PNGLIB_NAME}-config DESTINATION bin)
+endif()
 
 # what's with libpng.txt and all the extra files?
 

scripts/descrip.mms

@@ -1,6 +1,6 @@
 
 cc_defs = /inc=$(ZLIBSRC)
-c_deb = 
+c_deb =
 
 .ifdef __DECC__
 pref = /prefix=all
@@ -29,7 +29,7 @@ test : pngtest.exe
    run pngtest
 
 clean :
-	delete *.obj;*,*.exe;*
+	delete *.obj;*,*.exe;
 
 
 # Other dependencies.
@@ -44,9 +44,9 @@ pngerror.obj : png.h, pngconf.h
 pngmem.obj : png.h, pngconf.h
 pngrio.obj : png.h, pngconf.h
 pngwio.obj : png.h, pngconf.h
-pngtest.obj : png.h, pngconf.h
 pngtrans.obj : png.h, pngconf.h
 pngwrite.obj : png.h, pngconf.h
 pngwtran.obj : png.h, pngconf.h
 pngwutil.obj : png.h, pngconf.h
 
+pngtest.obj : png.h, pngconf.h

scripts/libpng-config-head.in

@@ -4,11 +4,14 @@
 # provides configuration info for libpng.
 
 # Copyright (C) 2002 Glenn Randers-Pehrson
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # Modeled after libxml-config.
 
-version=1.0.41
+version=1.0.50
 prefix=""
 libdir=""
 libs=""

scripts/libpng-config.in

@@ -4,7 +4,10 @@
 # provides configuration info for libpng.
 
 # Copyright (C) 2002, 2004, 2006, 2007 Glenn Randers-Pehrson
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # Modeled after libxml-config.
 

scripts/libpng.icc

@@ -1,13 +1,16 @@
 // 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
+//
+// This code is released under the libpng license.
+// For conditions of distribution and use, see the disclaimer
+// and license in png.h
+//
 // Notes:
 //   All modules are compiled in C mode
 //   Tested with IBM VAC++ 4.0 under Win32
 //   Expected to work with IBM VAC++ 4.0 or later under OS/2 and Win32
 //   Can be easily adapted for IBM VAC++ 4.0 or later under AIX
-// For conditions of distribution and use, see copyright notice in png.h
 
 option incl(searchpath, "../zlib"), opt(level, "2"),
  link(libsearchpath, "../zlib")

scripts/libpng.pc.in

@@ -5,6 +5,6 @@ includedir=@includedir@/libpng10
 
 Name: libpng
 Description: Loads and saves PNG files
-Version: 1.0.41
+Version: 1.0.50
 Libs: -L${libdir} -lpng10
 Cflags: -I${includedir}

scripts/makefile.32sunu

@@ -3,12 +3,15 @@
 # Copyright (C) 2002, 2006 Glenn Randers-Pehrson
 # Copyright (C) 1998 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # Library name:
 LIBNAME=libpng10
 PNGMAJ = 0
-PNGMIN = 1.0.41
+PNGMIN = 1.0.50
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:

scripts/makefile.64sunu

@@ -3,12 +3,15 @@
 # Copyright (C) 2002, 2006 Glenn Randers-Pehrson
 # Copyright (C) 1998 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # Library name:
 LIBNAME=libpng10
 PNGMAJ = 0
-PNGMIN = 1.0.41
+PNGMIN = 1.0.50
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:

scripts/makefile.acorn

@@ -6,11 +6,10 @@ 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 = 
+CMHGflags =
 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 \

scripts/makefile.aix

@@ -1,9 +1,12 @@
 # makefile for libpng using gcc (generic, static library)
-# Copyright (C) 2002, 2006, 2008 Glenn Randers-Pehrson
+# Copyright (C) 2002, 2006-2009 Glenn Randers-Pehrson
 # Copyright (C) 2000 Cosmin Truta
 # Copyright (C) 2000 Marc O. Gloor (AIX support added, from makefile.gcc)
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # Location of the zlib library and include files
 ZLIBINC = ../zlib
@@ -20,7 +23,7 @@ LN_SF = ln -f -s
 
 LIBNAME=libpng10
 PNGMAJ = 0
-PNGMIN = 1.0.41
+PNGMIN = 1.0.50
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 prefix=/usr/local
@@ -54,7 +57,7 @@ A=.a
 E=
 
 # Variables
-OBJS = png$(O) pngerror$(O) pngget$(O) pngmem$(O) pngpread$(O) \
+OBJS =  png$(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)
 
@@ -94,20 +97,20 @@ install: $(LIBNAME)$(A)
 clean:
 	$(RM_F) *.o $(LIBNAME)$(A) pngtest pngout.png
 
-png$(O): png.h pngconf.h
+png$(O):      png.h pngconf.h
 pngerror$(O): png.h pngconf.h
-pngget$(O): png.h pngconf.h
-pngmem$(O): png.h pngconf.h
+pngget$(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
+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
+pngset$(O):   png.h pngconf.h
 pngtrans$(O): png.h pngconf.h
-pngwio$(O): png.h pngconf.h
+pngwio$(O):   png.h pngconf.h
 pngwrite$(O): png.h pngconf.h
 pngwtran$(O): png.h pngconf.h
 pngwutil$(O): png.h pngconf.h
 
+pngtest$(O):  png.h pngconf.h

scripts/makefile.amiga

@@ -1,7 +1,10 @@
 # Commodore Amiga Makefile
 # 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
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 #
 # Note: Use #define PNG_READ_BIG_ENDIAN_SUPPORTED in pngconf.h
 #

scripts/makefile.atari

@@ -1,8 +1,12 @@
 # makefile for libpng
 # Copyright (C) 2002 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
-# For conditions of distribution and use, see copyright notice in png.h
-# modified for LC56/ATARI assumes libz.lib is in same dir and uses default
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
+
+# Modified for LC56/ATARI assumes libz.lib is in same dir and uses default
 # rules for library management
 #
 CFLAGS=-I..\zlib -O

scripts/makefile.bc32

@@ -11,7 +11,6 @@
 ## Where zlib.h, zconf.h and zlib.lib are
 ZLIB_DIR=..\zlib
 
-
 ## Compiler, linker and lib stuff
 CC=bcc32
 LD=bcc32
@@ -49,7 +48,6 @@ CFLAGS=-I$(ZLIB_DIR) -O2 -d -k- -w $(TARGET_CPU) $(CDEBUG)
 # -M  generate map file
 LDFLAGS=-L$(ZLIB_DIR) -M $(LDEBUG)
 
-
 ## Variables
 OBJS = \
 	png.obj \
@@ -87,7 +85,6 @@ LIBOBJS = \
 
 LIBNAME=libpng.lib
 
-
 ## Implicit rules
 # Braces let make "batch" calls to the compiler,
 # 2 calls instead of 12; space is important.
@@ -100,7 +97,6 @@ LIBNAME=libpng.lib
 .obj.exe:
 	$(LD) $(LDFLAGS) $*.obj $(LIBNAME) zlib.lib $(NOEHLIB)
 
-
 ## Major targets
 all: libpng pngtest
 
@@ -111,25 +107,24 @@ pngtest: pngtest.exe
 test: pngtest.exe
 	pngtest
 
-
 ## Minor Targets
 
-png.obj: png.c
-pngerror.obj: pngerror.c
-pngget.obj: pngget.c
-pngmem.obj: pngmem.c
-pngpread.obj: pngpread.c
-pngread.obj: pngread.c
-pngrio.obj: pngrio.c
-pngrtran.obj: pngrtran.c
-pngrutil.obj: pngrutil.c
-pngset.obj: pngset.c
-pngtrans.obj: pngtrans.c
-pngwio.obj: pngwio.c
-pngwrite.obj: pngwrite.c
-pngwtran.obj: pngwtran.c
-pngwutil.obj: pngwutil.c
-
+png.obj: png.c png.h pngconf.h
+pngerror.obj: pngerror.c png.h pngconf.h
+pngget.obj: pngget.c png.h pngconf.h
+pngmem.obj: pngmem.c png.h pngconf.h
+pngpread.obj: pngpread.c png.h pngconf.h
+pngread.obj: pngread.c png.h pngconf.h
+pngrio.obj: pngrio.c png.h pngconf.h
+pngrtran.obj: pngrtran.c png.h pngconf.h
+pngrutil.obj: pngrutil.c png.h pngconf.h
+pngset.obj: pngset.c png.h pngconf.h
+pngtrans.obj: pngtrans.c png.h pngconf.h
+pngwio.obj: pngwio.c png.h pngconf.h
+pngwrite.obj: pngwrite.c png.h pngconf.h
+pngwtran.obj: pngwtran.c png.h pngconf.h
+pngwutil.obj: pngwutil.c png.h pngconf.h
+pngtest.obj: pngtest.c png.h pngconf.h
 
 $(LIBNAME): $(OBJS)
 	-del $(LIBNAME)
@@ -137,7 +132,6 @@ $(LIBNAME): $(OBJS)
 $(LIBOBJS), libpng
 |
 
-
 # Cleanup
 clean:
 	-del *.obj
@@ -148,5 +142,4 @@ clean:
 	-del *.tds
 	-del pngout.png
 
-
 # End of makefile for libpng

scripts/makefile.beos

@@ -3,12 +3,15 @@
 # Copyright (C) 2002, 2006, 2008 Glenn Randers-Pehrson
 # Copyright (C) 1999 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # Library name:
 LIBNAME=libpng10
 PNGMAJ = 0
-PNGMIN = 1.0.41
+PNGMIN = 1.0.50
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
@@ -223,4 +226,5 @@ pngwrite.o pngwrite.pic.o: png.h pngconf.h
 pngwtran.o pngwtran.pic.o: png.h pngconf.h
 pngwutil.o pngwutil.pic.o: png.h pngconf.h
 pngpread.o pngpread.pic.o: png.h pngconf.h
+
 pngtest.o: png.h pngconf.h

scripts/makefile.bor

@@ -12,7 +12,6 @@
 ## Where zlib.h, zconf.h and zlib_MODEL.lib are
 ZLIB_DIR=..\zlib
 
-
 ## Compiler, linker and lib stuff
 CC=bcc
 LD=bcc
@@ -57,8 +56,8 @@ CFLAGS=-O2 -Z -X- -w -I$(ZLIB_DIR) -$(TARGET_CPU) $(MODEL_ARG) $(CDEBUG)
 # -M  generate map file
 LDFLAGS=-M -L$(ZLIB_DIR) $(MODEL_ARG) $(LDEBUG)
 
-
 ## Variables
+
 OBJS = \
 	png.obj \
 	pngerror.obj \
@@ -95,8 +94,8 @@ LIBOBJS = \
 
 LIBNAME=libpng$(MODEL).lib
 
-
 ## Implicit rules
+
 # Braces let make "batch" calls to the compiler,
 # 2 calls instead of 12; space is important.
 .c.obj:
@@ -105,8 +104,8 @@ LIBNAME=libpng$(MODEL).lib
 .c.exe:
 	$(CC) $(CFLAGS) $(LDFLAGS) $*.c $(LIBNAME) zlib_$(MODEL).lib $(NOEHLIB)
 
-
 ## Major targets
+
 all: libpng pngtest
 
 libpng: $(LIBNAME)
@@ -116,25 +115,23 @@ pngtest: pngtest$(MODEL).exe
 test: pngtest$(MODEL).exe
 	pngtest$(MODEL)
 
-
 ## Minor Targets
 
-png.obj: png.c
-pngerror.obj: pngerror.c
-pngget.obj: pngget.c
-pngmem.obj: pngmem.c
-pngpread.obj: pngpread.c
-pngread.obj: pngread.c
-pngrio.obj: pngrio.c
-pngrtran.obj: pngrtran.c
-pngrutil.obj: pngrutil.c
-pngset.obj: pngset.c
-pngtrans.obj: pngtrans.c
-pngwio.obj: pngwio.c
-pngwrite.obj: pngwrite.c
-pngwtran.obj: pngwtran.c
-pngwutil.obj: pngwutil.c
-
+png.obj: png.c png.h pngconf.h
+pngerror.obj: pngerror.c png.h pngconf.h
+pngget.obj: pngget.c png.h pngconf.h
+pngmem.obj: pngmem.c png.h pngconf.h
+pngpread.obj: pngpread.c png.h pngconf.h
+pngread.obj: pngread.c png.h pngconf.h
+pngrio.obj: pngrio.c png.h pngconf.h
+pngrtran.obj: pngrtran.c png.h pngconf.h
+pngrutil.obj: pngrutil.c png.h pngconf.h
+pngset.obj: pngset.c png.h pngconf.h
+pngtrans.obj: pngtrans.c png.h pngconf.h
+pngwio.obj: pngwio.c png.h pngconf.h
+pngwrite.obj: pngwrite.c png.h pngconf.h
+pngwtran.obj: pngwtran.c png.h pngconf.h
+pngwutil.obj: pngwutil.c png.h pngconf.h
 
 $(LIBNAME): $(OBJS)
 	-del $(LIBNAME)
@@ -142,14 +139,12 @@ $(LIBNAME): $(OBJS)
 $(LIBOBJS), libpng$(MODEL)
 |
 
-
 pngtest$(MODEL).obj: pngtest.c
 	$(CC) $(CFLAGS) -opngtest$(MODEL) -c pngtest.c
 
 pngtest$(MODEL).exe: pngtest$(MODEL).obj
 	$(LD) $(LDFLAGS) pngtest$(MODEL).obj $(LIBNAME) zlib_$(MODEL).lib $(NOEHLIB)
 
-
 # Clean up anything else you want
 clean:
 	-del *.obj
@@ -158,5 +153,4 @@ clean:
 	-del *.lst
 	-del *.map
 
-
 # End of makefile for libpng

scripts/makefile.cygwin

@@ -7,7 +7,10 @@
 #    and Glenn Randers-Pehrson, based on makefile for linux-elf w/mmx by:
 # Copyright (C) 1998-2000 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # This makefile intends to support building outside the src directory
 # if desired. When invoking it, specify an argument to SRCDIR on the
@@ -74,7 +77,7 @@ CFLAGS= $(strip $(MINGW_CCFLAGS) $(addprefix -I,$(ZLIBINC)) \
 LIBNAME = libpng10
 PNGMAJ = 0
 CYGDLL = 10
-PNGMIN = 1.0.41
+PNGMIN = 1.0.50
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 SHAREDLIB=cygpng$(CYGDLL).dll
@@ -176,7 +179,7 @@ pngtest-stat$(EXE): pngtest.o $(STATLIB)
 pngtest.pic.o: pngtest.c
 	$(CC) $(CFLAGS) -c $< -o $@
 
-pngtest.o: pngtest.c
+pngtest.o: pngtest.c png.h pngconf.h
 	$(CC) $(CFLAGS) -c $< -o $@
 
 test: test-static test-shared

scripts/makefile.darwin

@@ -4,7 +4,10 @@
 # derived from makefile.linux:
 #  Copyright (C) 1998, 1999 Greg Roelofs
 #  Copyright (C) 1996, 1997 Andreas Dilger
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # where "make install" puts libpng.a, libpng10.dylib, png.h and pngconf.h
 prefix=/usr/local
@@ -18,8 +21,8 @@ ZLIBINC=../zlib
 
 # Library name:
 LIBNAME = libpng10
-PNGMAJ = 12
-PNGMIN = 1.0.41
+PNGMAJ = 10
+PNGMIN = 1.0.50
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:

scripts/makefile.dec

@@ -1,11 +1,14 @@
 # makefile for libpng on DEC Alpha Unix
 # Copyright (C) 2000-2002, 2006 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # Library name:
 PNGMAJ = 0
-PNGMIN = 1.0.41
+PNGMIN = 1.0.50
 PNGVER = $(PNGMAJ).$(PNGMIN)
 LIBNAME = libpng10
 
@@ -205,10 +208,10 @@ pngget.o: png.h pngconf.h
 pngread.o: png.h pngconf.h
 pngrtran.o: png.h pngconf.h
 pngrutil.o: png.h pngconf.h
-pngtest.o: png.h pngconf.h
 pngtrans.o: png.h pngconf.h
 pngwrite.o: png.h pngconf.h
 pngwtran.o: png.h pngconf.h
 pngwutil.o: png.h pngconf.h
 pngpread.o: png.h pngconf.h
 
+pngtest.o: png.h pngconf.h

scripts/makefile.dj2

@@ -1,7 +1,10 @@
 # DJGPP (DOS gcc) makefile for libpng
-# Copyright (C) 2002 Glenn Randers-Pehrson
+# Copyright (C) 2002, 2006, 2009 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # where make install will put libpng.a and png.h
 #prefix=/usr/local
@@ -47,9 +50,9 @@ pngread.o: png.h pngconf.h
 pngpread.o: png.h pngconf.h
 pngrtran.o: png.h pngconf.h
 pngrutil.o: png.h pngconf.h
-pngtest.o: png.h pngconf.h
 pngtrans.o: png.h pngconf.h
 pngwrite.o: png.h pngconf.h
 pngwtran.o: png.h pngconf.h
 pngwutil.o: png.h pngconf.h
 
+pngtest.o: png.h pngconf.h

scripts/makefile.elf

@@ -2,7 +2,10 @@
 # Copyright (C) 1998, 1999, 2002, 2006, 2008 Greg Roelofs
 # and Glenn Randers-Pehrson
 # Copyright (C) 1996, 1997 Andreas Dilger
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # Modified for Debian by Junichi Uekawa and Josselin Mouette
 # Major modifications are:
@@ -13,7 +16,7 @@
 # Library name:
 LIBNAME = libpng10
 PNGMAJ = 0
-PNGMIN = 1.0.41
+PNGMIN = 1.0.50
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:

scripts/makefile.freebsd

@@ -1,6 +1,9 @@
 # makefile for libpng under FreeBSD
-# Copyright (C) 2002, 2007 Glenn Randers-Pehrson and Andrey A. Chernov
-# For conditions of distribution and use, see copyright notice in png.h
+# Copyright (C) 2002, 2007, 2009 Glenn Randers-Pehrson and Andrey A. Chernov
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 PREFIX?=        /usr/local
 SHLIB_VER?=     5

scripts/makefile.gcc

@@ -2,7 +2,10 @@
 # Copyright (C) 2008 Glenn Randers-Pehrson
 # Copyright (C) 2000 Cosmin Truta
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # Location of the zlib library and include files
 ZLIBINC = ../zlib
@@ -31,9 +34,9 @@ A=.a
 EXE=
 
 # 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$(O)
+OBJS =  png$(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: static
@@ -61,20 +64,20 @@ pngtest$(EXE): pngtest$(O) libpng$(A)
 clean:
 	$(RM_F) *$(O) libpng$(A) pngtest$(EXE) pngout.png
 
-png$(O): png.h pngconf.h
+png$(O):      png.h pngconf.h
 pngerror$(O): png.h pngconf.h
-pngget$(O): png.h pngconf.h
-pngmem$(O): png.h pngconf.h
+pngget$(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
+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
+pngset$(O):   png.h pngconf.h
 pngtrans$(O): png.h pngconf.h
-pngwio$(O): png.h pngconf.h
+pngwio$(O):   png.h pngconf.h
 pngwrite$(O): png.h pngconf.h
 pngwtran$(O): png.h pngconf.h
 pngwutil$(O): png.h pngconf.h
 
+pngtest$(O):  png.h pngconf.h

scripts/makefile.gcmmx

@@ -3,7 +3,10 @@
 # Copyright 2002, 2006, 2008 Greg Roelofs and Glenn Randers-Pehrson
 # Copyright 1998-2001 Greg Roelofs
 # Copyright 1996-1997 Andreas Dilger
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # CAUTION: Do not use this makefile with gcc versions 2.7.2.2 and earlier.
 
@@ -14,7 +17,7 @@
 # Library name:
 LIBNAME = libpng10
 PNGMAJ = 0
-PNGMIN = 1.0.41
+PNGMIN = 1.0.50
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
@@ -64,11 +67,11 @@ CFLAGS=-DPNG_THREAD_UNSAFE_OK -I$(ZLIBINC) -W -Wall -O \
 ### for gcc 2.95.2 on 686:
 #CFLAGS=-DPNG_THREAD_UNSAFE_OK -I$(ZLIBINC) -W -Wall -O \
 #	-mcpu=i686 -malign-double -ffast-math -fstrict-aliasing \
-#	$(ALIGN) -funroll-loops -funroll-all-loops -fomit-frame-pointer 
+#	$(ALIGN) -funroll-loops -funroll-all-loops -fomit-frame-pointer
 ### for gcc 2.7.2.3 on 486 and up:
 #CFLAGS=-DPNG_THREAD_UNSAFE_OK -I$(ZLIBINC) -W -Wall -O \
 #	-m486 -malign-double -ffast-math \
-#	$(ALIGN) -funroll-loops -funroll-all-loops -fomit-frame-pointer 
+#	$(ALIGN) -funroll-loops -funroll-all-loops -fomit-frame-pointer
 
 LDFLAGS=-L. -Wl,-rpath,. -L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) -lpng10 -lz -lm
 LDFLAGS_A=-L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) libpng.a -lz -lm

scripts/makefile.hp64

@@ -1,8 +1,11 @@
 # makefile for libpng, HPUX (10.20 and 11.00) using the ANSI/C product.
-# Copyright (C) 1999-2002 Glenn Randers-Pehrson
+# Copyright (C) 1999-2002, 2006, 2009 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42
 # contributed by Jim Rice and updated by Chris Schleicher, Hewlett Packard
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # Where the zlib library and include files are located
 ZLIBLIB=/opt/zlib/lib
@@ -18,7 +21,7 @@ ZLIBINC=/opt/zlib/include
 # Library name:
 LIBNAME = libpng10
 PNGMAJ = 0
-PNGMIN = 1.0.41
+PNGMIN = 1.0.50
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
@@ -227,9 +230,10 @@ pngget.o: png.h pngconf.h
 pngread.o: png.h pngconf.h
 pngrtran.o: png.h pngconf.h
 pngrutil.o: png.h pngconf.h
-pngtest.o: png.h pngconf.h
 pngtrans.o: png.h pngconf.h
 pngwrite.o: png.h pngconf.h
 pngwtran.o: png.h pngconf.h
 pngwutil.o: png.h pngconf.h
 pngpread.o: png.h pngconf.h
+
+pngtest.o: png.h pngconf.h

scripts/makefile.hpgcc

@@ -3,12 +3,15 @@
 # Copyright (C) 2001, Laurent faillie
 # Copyright (C) 1998, 1999 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # Library name:
 LIBNAME = libpng10
 PNGMAJ = 0
-PNGMIN = 1.0.41
+PNGMIN = 1.0.50
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:

scripts/makefile.hpux

@@ -2,7 +2,10 @@
 # Copyright (C) 1999-2002, 2006 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42
 # contributed by Jim Rice and updated by Chris Schleicher, Hewlett Packard
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # Where the zlib library and include files are located
 ZLIBLIB=/opt/zlib/lib
@@ -18,7 +21,7 @@ ZLIBINC=/opt/zlib/include
 # Library name:
 LIBNAME = libpng10
 PNGMAJ = 0
-PNGMIN = 1.0.41
+PNGMIN = 1.0.50
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
@@ -224,9 +227,10 @@ pngget.o: png.h pngconf.h
 pngread.o: png.h pngconf.h
 pngrtran.o: png.h pngconf.h
 pngrutil.o: png.h pngconf.h
-pngtest.o: png.h pngconf.h
 pngtrans.o: png.h pngconf.h
 pngwrite.o: png.h pngconf.h
 pngwtran.o: png.h pngconf.h
 pngwutil.o: png.h pngconf.h
 pngpread.o: png.h pngconf.h
+
+pngtest.o: png.h pngconf.h

scripts/makefile.ibmc

@@ -1,7 +1,12 @@
 # Makefile for libpng (static)
 # IBM C version 3.x for Win32 and OS/2
+# Copyright (C) 2006 Glenn Randers-Pehrson
 # Copyright (C) 2000 Cosmin Truta
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
+
 # Notes:
 #   Derived from makefile.std
 #   All modules are compiled in C mode
@@ -53,19 +58,20 @@ clean:
 	$(RM) pngtest$(E)
 	$(RM) pngout.png
 
-png$(O): png.h pngconf.h
+png$(O):      png.h pngconf.h
 pngerror$(O): png.h pngconf.h
-pngget$(O): png.h pngconf.h
-pngmem$(O): png.h pngconf.h
+pngget$(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
+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
+pngset$(O):   png.h pngconf.h
 pngtrans$(O): png.h pngconf.h
-pngwio$(O): png.h pngconf.h
+pngwio$(O):   png.h pngconf.h
 pngwrite$(O): png.h pngconf.h
 pngwtran$(O): png.h pngconf.h
 pngwutil$(O): png.h pngconf.h
+
+pngtest$(O):  png.h pngconf.h

scripts/makefile.intel

@@ -1,12 +1,17 @@
 # Makefile for libpng
 # Microsoft Visual C++ with Intel C/C++ Compiler 4.0 and later
 
+# Copyright (C) 2006 Glenn Randers-Pehrson
 # Copyright (C) 2000, Pawel Mrochen, based on makefile.msc which is
 # copyright 1995 Guy Eric Schalnat, Group 42, Inc.
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # To use, do "nmake /f scripts\makefile.intel"
 
+# ------------------- Intel C/C++ Compiler 4.0 and later -------------------
 
 # Where the zlib library and include files are located
 ZLIBLIB=..\zlib
@@ -26,7 +31,6 @@ CALLING=r	# __fastcall
 
 # --------------------------------------------------------------------------
 
-
 CC=icl -c
 CFLAGS=-O2 -G$(CPU)$(CALLING) -Qip -Qunroll4 -I$(ZLIBINC) -nologo
 LD=link
@@ -73,9 +77,6 @@ pngrio$(O): png.h pngconf.h
 pngwio$(O): png.h pngconf.h
 	$(CC) $(CFLAGS) $*.c $(ERRFILE)
 
-pngtest$(O): png.h pngconf.h
-	$(CC) $(CFLAGS) $*.c $(ERRFILE)
-
 pngtrans$(O): png.h pngconf.h
 	$(CC) $(CFLAGS) $*.c $(ERRFILE)
 
@@ -95,6 +96,9 @@ libpng.lib: $(OBJS)
 pngtest.exe: pngtest.obj libpng.lib
 	$(LD) $(LDFLAGS) /OUT:pngtest.exe pngtest.obj libpng.lib $(ZLIBLIB)\zlib.lib
 
+pngtest$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
 test: pngtest.exe
 	pngtest.exe
 

scripts/makefile.knr

@@ -1,7 +1,10 @@
 # makefile for libpng
-# Copyright (C) 2002 Glenn Randers-Pehrson
+# Copyright (C) 2002, 2006, 2009 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # This makefile requires the file ansi2knr.c, which you can get
 # from the Ghostscript ftp site at ftp://ftp.cs.wisc.edu/ghost/
@@ -58,7 +61,7 @@ pngtest: pngtest.o libpng.a
 test: pngtest
 	./pngtest
 
-install: libpng.a
+install: libpng.a png.h pngconf.h
 	-@mkdir $(DESTDIR)$(INCPATH)
 	-@mkdir $(DESTDIR)$(INCPATH)/libpng
 	-@mkdir $(DESTDIR)$(LIBPATH)
@@ -92,8 +95,9 @@ pngread.o: png.h pngconf.h
 pngpread.o: png.h pngconf.h
 pngrtran.o: png.h pngconf.h
 pngrutil.o: png.h pngconf.h
-pngtest.o: png.h pngconf.h
 pngtrans.o: png.h pngconf.h
 pngwrite.o: png.h pngconf.h
 pngwtran.o: png.h pngconf.h
 pngwutil.o: png.h pngconf.h
+
+pngtest.o: png.h pngconf.h

scripts/makefile.linux

@@ -2,12 +2,15 @@
 # Copyright (C) 1998, 1999, 2002, 2006, 2008 Greg Roelofs and
 # Glenn Randers-Pehrson
 # Copyright (C) 1996, 1997 Andreas Dilger
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # Library name:
 LIBNAME = libpng10
 PNGMAJ = 0
-PNGMIN = 1.0.41
+PNGMIN = 1.0.50
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
@@ -74,7 +77,7 @@ DI=$(DESTDIR)$(INCPATH)
 DL=$(DESTDIR)$(LIBPATH)
 DM=$(DESTDIR)$(MANPATH)
 
-OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.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
 

scripts/makefile.mingw

@@ -3,13 +3,16 @@
 #   of the library, and builds two copies of pngtest: one
 #   statically linked and one dynamically linked.
 #
-# Built from makefile.cygwin
 # Copyright (C) 2002, 2006, 2008 Soren Anderson, Charles Wilson,
 #    and Glenn Randers-Pehrson, based on makefile for linux-elf w/mmx by:
 # Copyright (C) 1998-2000, 2007 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger
-# For conditions of distribution and use, see copyright notice in png.h
 
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
+
+# Built from makefile.cygwin
 
 # This makefile intends to support building outside the src directory
 # if desired. When invoking it, specify an argument to SRCDIR on the
@@ -74,7 +77,7 @@ CFLAGS= $(strip $(MINGW_CCFLAGS) $(addprefix -I,$(ZLIBINC)) \
 LIBNAME = libpng10
 PNGMAJ = 0
 MINGDLL = 10
-PNGMIN = 1.0.41
+PNGMIN = 1.0.50
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 SHAREDLIB=libpng$(MINGDLL).dll
@@ -284,6 +287,3 @@ pngwutil.o pngwutil.pic.o:	png.h pngconf.h pngwutil.c
 pngpread.o pngpread.pic.o:	png.h pngconf.h pngpread.c
 
 pngtest.o pngtest.pic.o:	png.h pngconf.h pngtest.c
-
-
-

scripts/makefile.mips

@@ -1,7 +1,10 @@
 # makefile for libpng
 # Copyright (C) Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # where make install puts libpng.a and png.h
 prefix=/usr/local
@@ -76,8 +79,9 @@ pngread.o: png.h pngconf.h
 pngpread.o: png.h pngconf.h
 pngrtran.o: png.h pngconf.h
 pngrutil.o: png.h pngconf.h
-pngtest.o: png.h pngconf.h
 pngtrans.o: png.h pngconf.h
 pngwrite.o: png.h pngconf.h
 pngwtran.o: png.h pngconf.h
 pngwutil.o: png.h pngconf.h
+
+pngtest.o: png.h pngconf.h

scripts/makefile.msc

@@ -1,6 +1,11 @@
 # makefile for libpng
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
-# For conditions of distribution and use, see copyright notice in png.h
+# Copyright (C) 2006, 2009 Glenn Randers-Pehrson
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
+
 # Assumes that zlib.lib, zconf.h, and zlib.h have been copied to ..\zlib
 
 # -------- Microsoft C 5.1 and later, does not use assembler code --------
@@ -55,9 +60,6 @@ pngrio$(O): png.h pngconf.h
 pngwio$(O): png.h pngconf.h
 	$(CC) -c $(CFLAGS) $*.c $(ERRFILE)
 
-pngtest$(O): png.h pngconf.h
-	$(CC) -c $(CFLAGS) $*.c $(ERRFILE)
-
 pngtrans$(O): png.h pngconf.h
 	$(CC) -c $(CFLAGS) $*.c $(ERRFILE)
 
@@ -76,6 +78,9 @@ libpng.lib: $(OBJS1) $(OBJS2) $(OBJS3)
 	lib libpng $(OBJS2);
 	lib libpng $(OBJS3);
 
+pngtest$(O): png.h pngconf.h
+	$(CC) -c $(CFLAGS) $*.c $(ERRFILE)
+
 pngtest.exe: pngtest.obj libpng.lib
 	$(LD) $(LDFLAGS) pngtest.obj,,,libpng.lib ..\zlib\zlib.lib ;
 

scripts/makefile.ne12bsd

@@ -2,8 +2,11 @@
 # make obj && make depend && make && make test
 # make includes && make install
 # Copyright (C) 2002 Patrick R.L. Welche
-# Copyright (C) 2007 Glenn Randers-Pehrson
-# For conditions of distribution and use, see copyright notice in png.h
+# Copyright (C) 2007, 2009 Glenn Randers-Pehrson
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # You should also run makefile.netbsd
 
@@ -12,9 +15,9 @@ LIBDIR=	${LOCALBASE}/lib
 MANDIR= ${LOCALBASE}/man
 INCSDIR=${LOCALBASE}/include/libpng10
 
-LIB=	png12
+LIB=	png10
 SHLIB_MAJOR=	0
-SHLIB_MINOR=	1.0.41
+SHLIB_MINOR=	1.0.50
 SRCS=	png.c pngset.c pngget.c pngrutil.c pngtrans.c pngwutil.c \
 	pngread.c pngrio.c pngwio.c pngwrite.c pngrtran.c \
 	pngwtran.c pngmem.c pngerror.c pngpread.c
@@ -23,7 +26,8 @@ MAN=	libpng.3 libpngpf.3 png.5
 
 CPPFLAGS+=-I${.CURDIR}
 
-# something like this for mmx assembler, but it core dumps for me at the moment
+# We should be able to do something like this instead of the manual
+# uncommenting, but it core dumps for me at the moment:
 # .if ${MACHINE_ARCH} == "i386"
 #   CPPFLAGS+=-DPNG_THREAD_UNSAFE_OK
 #   MKLINT= no

scripts/makefile.netbsd

@@ -2,8 +2,11 @@
 # make obj && make depend && make && make test
 # make includes && make install
 # Copyright (C) 2002 Patrick R.L. Welche
-# Copyright (C) 2007 Glenn Randers-Pehrson
-# For conditions of distribution and use, see copyright notice in png.h
+# Copyright (C) 2007, 2009 Glenn Randers-Pehrson
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # You should also run makefile.ne0bsd
 
@@ -14,7 +17,7 @@ INCSDIR=${LOCALBASE}/include/libpng
 
 LIB=	png
 SHLIB_MAJOR=	3
-SHLIB_MINOR=	1.0.41
+SHLIB_MINOR=	1.0.50
 SRCS=	png.c pngset.c pngget.c pngrutil.c pngtrans.c pngwutil.c \
 	pngread.c pngrio.c pngwio.c pngwrite.c pngrtran.c \
 	pngwtran.c pngmem.c pngerror.c pngpread.c
@@ -23,7 +26,8 @@ MAN=	libpng.3 libpngpf.3 png.5
 
 CPPFLAGS+=-I${.CURDIR}
 
-# something like this for mmx assembler, but it core dumps for me at the moment
+# We should be able to do something like this instead of the manual
+# uncommenting, but it core dumps for me at the moment:
 # .if ${MACHINE_ARCH} == "i386"
 #   CPPFLAGS+=-DPNG_THREAD_UNSAFE_OK
 #   MKLINT= no

scripts/makefile.nommx

@@ -2,12 +2,15 @@
 # Copyright (C) 1998, 1999, 2002, 2006-2008 Greg Roelofs and
 # Glenn Randers-Pehrson
 # Copyright (C) 1996, 1997 Andreas Dilger
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # Library name:
 LIBNAME = libpng10
 PNGMAJ = 0
-PNGMIN = 1.0.41
+PNGMIN = 1.0.50
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
@@ -233,20 +236,20 @@ writelock:
 
 # DO NOT DELETE THIS LINE -- make depend depends on it.
 
-png.o png.pic.o: png.h pngconf.h
-pngerror.o pngerror.pic.o: png.h pngconf.h
-pngrio.o pngrio.pic.o: png.h pngconf.h
-pngwio.o pngwio.pic.o: png.h pngconf.h
-pngmem.o pngmem.pic.o: png.h pngconf.h
-pngset.o pngset.pic.o: png.h pngconf.h
-pngget.o pngget.pic.o: png.h pngconf.h
-pngread.o pngread.pic.o: png.h pngconf.h
-pngrtran.o pngrtran.pic.o: png.h pngconf.h
-pngrutil.o pngrutil.pic.o: png.h pngconf.h
-pngtrans.o pngtrans.pic.o: png.h pngconf.h
-pngwrite.o pngwrite.pic.o: png.h pngconf.h
-pngwtran.o pngwtran.pic.o: png.h pngconf.h
-pngwutil.o pngwutil.pic.o: png.h pngconf.h
-pngpread.o pngpread.pic.o: png.h pngconf.h
+png.o png.pic.o:		png.h pngconf.h png.c
+pngerror.o pngerror.pic.o:	png.h pngconf.h pngerror.c
+pngrio.o pngrio.pic.o:		png.h pngconf.h pngrio.c
+pngwio.o pngwio.pic.o:		png.h pngconf.h pngwio.c
+pngmem.o pngmem.pic.o:		png.h pngconf.h pngmem.c
+pngset.o pngset.pic.o:		png.h pngconf.h pngset.c
+pngget.o pngget.pic.o:		png.h pngconf.h pngget.c
+pngread.o pngread.pic.o:	png.h pngconf.h pngread.c
+pngrtran.o pngrtran.pic.o:	png.h pngconf.h pngrtran.c
+pngrutil.o pngrutil.pic.o:	png.h pngconf.h pngrutil.c
+pngtrans.o pngtrans.pic.o:	png.h pngconf.h pngtrans.c
+pngwrite.o pngwrite.pic.o:	png.h pngconf.h pngwrite.c
+pngwtran.o pngwtran.pic.o:	png.h pngconf.h pngwtran.c
+pngwutil.o pngwutil.pic.o:	png.h pngconf.h pngwutil.c
+pngpread.o pngpread.pic.o:	png.h pngconf.h pngpread.c
 
-pngtest.o: png.h pngconf.h
+pngtest.o:			png.h pngconf.h pngtest.c

scripts/makefile.openbsd

@@ -1,14 +1,17 @@
 # makefile for libpng
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
 # Copyright (C) 2007-2008 Glenn Randers-Pehrson
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 PREFIX?= /usr/local
 LIBDIR=	${PREFIX}/lib
 MANDIR= ${PREFIX}/man/cat
 
 SHLIB_MAJOR=	0
-SHLIB_MINOR=	1.0.41
+SHLIB_MINOR=	1.0.50
 
 LIB=	png
 SRCS=	png.c pngerror.c pngget.c pngmem.c pngpread.c \
@@ -18,7 +21,7 @@ SRCS=	png.c pngerror.c pngget.c pngmem.c pngpread.c \
 HDRS=	png.h pngconf.h
 
 CFLAGS+= -W -Wall
-CPPFLAGS+= -I${.CURDIR} -DPNG_NO_MMX_CODE 
+CPPFLAGS+= -I${.CURDIR} -DPNG_NO_MMX_CODE
 
 NOPROFILE= Yes
 

scripts/makefile.os2

@@ -1,5 +1,8 @@
 # makefile for libpng on OS/2 with gcc
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # Related files: pngos2.def
 

scripts/makefile.sco

@@ -4,12 +4,15 @@
 # Copyright (C) 2002, 2006 Glenn Randers-Pehrson
 # Copyright (C) 1998 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # Library name:
 LIBNAME = libpng10
 PNGMAJ = 0
-PNGMIN = 1.0.41
+PNGMIN = 1.0.50
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:

scripts/makefile.sggcc

@@ -1,12 +1,15 @@
 # makefile for libpng.a and libpng10.so, SGI IRIX with 'cc'
 # Copyright (C) 2001-2002, 2006 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # Library name:
 LIBNAME=libpng10
 PNGMAJ = 0
-PNGMIN = 1.0.41
+PNGMIN = 1.0.50
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
@@ -212,10 +215,8 @@ test-installed:
 	./pngtesti pngtest.png
 
 clean:
-	$(RM_F) libpng.a pngtest pngtesti pngout.png libpng.pc libpng-config \
-	$(LIBSO) $(LIBSOMAJ)* \
-	$(OLDSOVER) \
-	so_locations
+	$(RM_F) libpng.a pngtest pngtesti pngout.png libpng.pc \
+        so_locations libpng-config $(LIBSO) $(LIBSOMAJ)* $(OLDSOVER)
 
 DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
 writelock:
@@ -233,10 +234,10 @@ pngget.o: png.h pngconf.h
 pngread.o: png.h pngconf.h
 pngrtran.o: png.h pngconf.h
 pngrutil.o: png.h pngconf.h
-pngtest.o: png.h pngconf.h
 pngtrans.o: png.h pngconf.h
 pngwrite.o: png.h pngconf.h
 pngwtran.o: png.h pngconf.h
 pngwutil.o: png.h pngconf.h
 pngpread.o: png.h pngconf.h
 
+pngtest.o: png.h pngconf.h

scripts/makefile.sgi

@@ -1,12 +1,15 @@
 # makefile for libpng.a and libpng10.so, SGI IRIX with 'cc'
 # Copyright (C) 2001-2002, 2006, 2007 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # Library name:
 LIBNAME=libpng10
 PNGMAJ = 0
-PNGMIN = 1.0.41
+PNGMIN = 1.0.50
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
@@ -236,10 +239,10 @@ pngget.o: png.h pngconf.h
 pngread.o: png.h pngconf.h
 pngrtran.o: png.h pngconf.h
 pngrutil.o: png.h pngconf.h
-pngtest.o: png.h pngconf.h
 pngtrans.o: png.h pngconf.h
 pngwrite.o: png.h pngconf.h
 pngwtran.o: png.h pngconf.h
 pngwutil.o: png.h pngconf.h
 pngpread.o: png.h pngconf.h
 
+pngtest.o: png.h pngconf.h

scripts/makefile.so9

@@ -4,11 +4,14 @@
 # Copyright (C) 2002, 2006, 2008 Glenn Randers-Pehrson
 # Copyright (C) 1998-2001 Greg Roelofs
 # Copyright (C) 1996-1997 Andreas Dilger
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # Library name:
 PNGMAJ = 0
-PNGMIN = 1.0.41
+PNGMIN = 1.0.50
 PNGVER = $(PNGMAJ).$(PNGMIN)
 LIBNAME = libpng10
 

scripts/makefile.solaris

@@ -3,12 +3,15 @@
 # Contributed by William L. Sebok, based on makefile.linux
 # Copyright (C) 1998 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # Library name:
 LIBNAME = libpng10
 PNGMAJ = 0
-PNGMIN = 1.0.41
+PNGMIN = 1.0.50
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
@@ -43,8 +46,7 @@ ZLIBINC=/usr/local/include
 WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
 	-Wmissing-declarations -Wtraditional -Wcast-align \
 	-Wstrict-prototypes -Wmissing-prototypes #-Wconversion
-CFLAGS=-I$(ZLIBINC) -W -Wall -O \
-	-DPNG_NO_MMX_CODE; \
+CFLAGS=-I$(ZLIBINC) -W -Wall -O -DPNG_NO_MMX_CODE; \
 	# $(WARNMORE) -g -DPNG_DEBUG=5
 LDFLAGS=-L. -R. -L$(ZLIBLIB) -R$(ZLIBLIB) -lpng10 -lz -lm
 

scripts/makefile.solaris-x86

@@ -3,12 +3,15 @@
 # Contributed by William L. Sebok, based on makefile.linux
 # Copyright (C) 1998 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # Library name:
 LIBNAME = libpng10
 PNGMAJ = 0
-PNGMIN = 1.0.41
+PNGMIN = 1.0.50
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:

scripts/makefile.std

@@ -1,7 +1,10 @@
 # makefile for libpng
 # Copyright (C) 2002, 2006 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # where make install puts libpng.a and png.h
 prefix=/usr/local
@@ -83,10 +86,10 @@ pngget.o: png.h pngconf.h
 pngread.o: png.h pngconf.h
 pngrtran.o: png.h pngconf.h
 pngrutil.o: png.h pngconf.h
-pngtest.o: png.h pngconf.h
 pngtrans.o: png.h pngconf.h
 pngwrite.o: png.h pngconf.h
 pngwtran.o: png.h pngconf.h
 pngwutil.o: png.h pngconf.h
 pngpread.o: png.h pngconf.h
 
+pngtest.o: png.h pngconf.h

scripts/makefile.sunos

@@ -1,7 +1,10 @@
 # makefile for libpng
 # Copyright (C) 2002, 2006 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # where make install puts libpng.a and png.h
 prefix=/usr/local
@@ -88,10 +91,10 @@ pngget.o: png.h pngconf.h
 pngread.o: png.h pngconf.h
 pngrtran.o: png.h pngconf.h
 pngrutil.o: png.h pngconf.h
-pngtest.o: png.h pngconf.h
 pngtrans.o: png.h pngconf.h
 pngwrite.o: png.h pngconf.h
 pngwtran.o: png.h pngconf.h
 pngwutil.o: png.h pngconf.h
 pngpread.o: png.h pngconf.h
 
+pngtest.o: png.h pngconf.h

scripts/makefile.vcawin32

@@ -1,17 +1,22 @@
 # makefile for libpng
+# Copyright (C) 2006,2009 Glenn Randers-Pehrson
 # Copyright (C) 1998 Tim Wegner
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
+
 # Assumes that zlib.lib, zconf.h, and zlib.h have been copied to ..\zlib
 # To use, do "nmake /f scripts\makefile.vcawin32"
 
-# -------- Microsoft Visual C++ 5.0 and later, uses assembler code --------
+# -------- Microsoft Visual C++ 2.0 and later, no assembler code --------
 # If you don't want to use assembler (MMX) code, use makefile.vcwin32 instead.
 
 # Compiler, linker, librarian, and other tools
 CC = cl
 LD = link
 AR = lib
-CFLAGS  = -DPNG_USE_PNGVCRD -nologo -MD -O2 -W3 -I..\zlib
+CFLAGS  = -nologo -DPNG_USE_PNGVCRD -MD -O2 -W3 -I..\zlib
 LDFLAGS = -nologo
 ARFLAGS = -nologo
 RM = del
@@ -64,9 +69,6 @@ pngrio$(O): png.h pngconf.h
 pngwio$(O): png.h pngconf.h
 	$(CC) -c $(CFLAGS) $*.c $(ERRFILE)
 
-pngtest$(O): png.h pngconf.h
-	$(CC) -c $(CFLAGS) $*.c $(ERRFILE)
-
 pngtrans$(O): png.h pngconf.h
 	$(CC) -c $(CFLAGS) $*.c $(ERRFILE)
 
@@ -83,6 +85,9 @@ libpng.lib: $(OBJS)
 	-$(RM) $@
 	$(AR) $(ARFLAGS) -out:$@ $(OBJS) $(ERRFILE)
 
+pngtest$(O): png.h pngconf.h
+	$(CC) -c $(CFLAGS) $*.c $(ERRFILE)
+
 pngtest.exe: pngtest$(O) libpng.lib
 	$(LD) $(LDFLAGS) -out:$@ pngtest$(O) libpng.lib ..\zlib\zlib.lib $(ERRFILE)
 

scripts/makefile.vcwin32

@@ -1,6 +1,11 @@
 # makefile for libpng
 # Copyright (C) 1998 Tim Wegner
-# For conditions of distribution and use, see copyright notice in png.h
+# Copyright (C) 2006,2009 Glenn Randers-Pehrson
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
+
 # Assumes that zlib.lib, zconf.h, and zlib.h have been copied to ..\zlib
 # To use, do "nmake /f scripts\makefile.vcwin32"
 
@@ -64,9 +69,6 @@ pngrio$(O): png.h pngconf.h
 pngwio$(O): png.h pngconf.h
 	$(CC) -c $(CFLAGS) $*.c $(ERRFILE)
 
-pngtest$(O): png.h pngconf.h
-	$(CC) -c $(CFLAGS) $*.c $(ERRFILE)
-
 pngtrans$(O): png.h pngconf.h
 	$(CC) -c $(CFLAGS) $*.c $(ERRFILE)
 
@@ -83,6 +85,9 @@ libpng.lib: $(OBJS)
 	-$(RM) $@
 	$(AR) $(ARFLAGS) -out:$@ $(OBJS) $(ERRFILE)
 
+pngtest$(O): png.h pngconf.h
+	$(CC) -c $(CFLAGS) $*.c $(ERRFILE)
+
 pngtest.exe: pngtest$(O) libpng.lib
 	$(LD) $(LDFLAGS) -out:$@ pngtest$(O) libpng.lib ..\zlib\zlib.lib $(ERRFILE)
 

scripts/makefile.watcom

@@ -3,7 +3,10 @@
 
 # Copyright (C) 2000, Pawel Mrochen, based on makefile.msc which is
 # copyright 1995 Guy Eric Schalnat, Group 42, Inc.
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
 
 # To use, do "wmake /f scripts\makefile.watcom"
 

scripts/makevms.com

@@ -55,8 +55,6 @@ $  then
 $   dele pngtest.obj;*
 $   CALL MAKE png.OBJ "cc ''CCOPT' png" -
 	png.c png.h pngconf.h
-$   CALL MAKE pngpread.OBJ "cc ''CCOPT' pngpread" -
-					 pngpread.c png.h pngconf.h
 $   CALL MAKE pngset.OBJ "cc ''CCOPT' pngset" -
 	pngset.c png.h pngconf.h
 $   CALL MAKE pngget.OBJ "cc ''CCOPT' pngget" -
@@ -64,7 +62,7 @@ $   CALL MAKE pngget.OBJ "cc ''CCOPT' pngget" -
 $   CALL MAKE pngread.OBJ "cc ''CCOPT' pngread" -
 	pngread.c png.h pngconf.h
 $   CALL MAKE pngpread.OBJ "cc ''CCOPT' pngpread" -
-					 pngpread.c png.h pngconf.h
+	pngpread.c png.h pngconf.h
 $   CALL MAKE pngrtran.OBJ "cc ''CCOPT' pngrtran" -
 	pngrtran.c png.h pngconf.h
 $   CALL MAKE pngrutil.OBJ "cc ''CCOPT' pngrutil" -

scripts/pngos2.def

@@ -2,7 +2,7 @@
 ; PNG.LIB module definition file for OS/2
 ;----------------------------------------
 
-; Version 1.0.41
+; Version 1.0.50
 
 LIBRARY		PNG
 DESCRIPTION	"PNG image compression library for OS/2"

scripts/pngw32.def

@@ -5,7 +5,7 @@
 LIBRARY
 
 EXPORTS
-;Version 1.0.41
+;Version 1.0.50
   png_build_grayscale_palette  @1
   png_check_sig        @2
   png_chunk_error      @3
@@ -189,6 +189,7 @@ EXPORTS
 ; Added at version 1.0.12
 ; For compatibility with 1.0.7-1.0.11
 ; png_info_init @174
+; png_read_init_3, png_info_init_3, and png_write_init_3 are deprecated.
   png_read_init_3    @175
   png_write_init_3    @176
   png_info_init_3 @177