import of libpng-1.2.4

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/LIBPNG@16093 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/png/ANNOUNCE

@@ -1,53 +1,30 @@
 
-Libpng 1.0.3 - January 14, 1999
+Libpng 1.2.4 - July 8, 2002
 
 This is a public release of libpng, intended for use in production codes.
 
-Changes since the previous public release (1.0.2):
+Changes since the last public release (1.2.3):
 
-libpng-1.0.3:
+  Added libpng.pc and libpng-config to "all:" target in 16 makefiles.
-
+  Fixed bug in 16 makefiles: $(DESTDIR)/$(LIBPATH) to $(DESTDIR)$(LIBPATH)
-  Replaced and extended code that was removed from png_set_filler() in 1.0.1a.
+  Added missing "\" before closing double quote in makefile.gcmmx.
-  Fixed a bug in png_do_filler() that made it fail to write filler bytes in
+  Plugged various memory leaks; added png_malloc_warn() and png_set_text_2()
-    the left-most pixel of each row (Kevin Bracey).
+    functions.
-  Changed "static pngcharp tIME_string" to "static char tIME_string[30]"
+  Plugged memory leak of png_ptr->current_text (Matt Holgate).
-    in pngtest.c (Duncan Simpson).
+  Check for buffer overflow before reading CRC in pngpread.c (Warwick Allison)
-  Fixed a bug in pngtest.c that caused pngtest to try to write a tIME chunk
+  Added -soname to the loader flags in makefile.dec, makefile.sgi, and
-    even when no tIME chunk was present in the source file.
+    makefile.sggcc.
-  Fixed a problem in pngrutil.c: gray_to_rgb didn't always work with 16-bit.
+  Added "test-installed" targets to makefile.linux, makefile.gcmmx,
-  Fixed a problem in png_read_push_finish_row(), which would not skip some
+    makefile.sgi, makefile.sggcc, makefile.32sunu, makefile.64sunu,
-    passes that it should skip, for images that are less than 3 pixels high.
+    makefile.beos, makefile.darwin, makefile.dec, makefile.macosx, 
-  Interchanged the order of calls to png_do_swap() and png_do_shift()
+    makefile.solaris, makefile.sco, makefile.cygwin, makefile.hpux,
-    in pngwtran.c (John Cromer).
+    makefile.hpgcc, and makefile.so9.
-  Added #ifdef PNG_DEBUG/#endif surrounding use of PNG_DEBUG in png.h .
+  Plugged memory leak of row_buf in pngtest.c when there is a png_error().
-  Changed "bad adaptive filter type" from error to warning in pngrutil.c .
+  Detect buffer overflow in pngpread.c when IDAT is corrupted with extra data.
-  Fixed a documentation error about default filtering with 8-bit indexed-color.
+  Revised pnggccrd.c to be able to back out version 1.0.x via PNG_1_0_X macro.
-  Separated the PNG_NO_STDIO macro into PNG_NO_STDIO and PNG_NO_CONSOLE_IO
+  Changed png_warning() to png_error() when width is too large to process.
-    (L. Peter Deutsch).
-  Added png_set_rgb_to_gray() and png_get_rgb_to_gray_status() functions.
-  Added png_get_copyright() and png_get_header_version() functions.
-  Revised comments on png_set_progressive_read_fn() in libpng.txt and example.c
-  Added information about debugging in libpng.txt and libpng.3 .
-  Changed "ln -sf" to "ln -s -f" in makefile.s2x, makefile.lnx, and makefile.sco.
-  Removed lines after Dynamic Dependencies" in makefile.aco .
-  Revised makefile.dec to make a shared library (Jeremie Petit).
-  Removed trailing blanks from all files. 
-  Removed misplaced #endif and #ifdef PNG_NO_EXTERN near the end of png.h
-  Added "if" tests to silence complaints about unused png_ptr in png.h and png.c
-  Changed "check_if_png" function in example.c to return true (nonzero) if PNG.
-  Changed libpng.txt to demonstrate png_sig_cmp() instead of png_check_sig()
-    which is obsolete.
-  Added makefile.hux, for Hewlett Packard HPUX 10.20 and 11.00 (Jim Rice)
-  Added a statement of Y2K compliance in png.h, libpng.1, and Y2KINFO.
 
 Send comments/corrections/commendations to
-png-implement@dworkin.wustl.edu or to randeg@alumni.rpi.edu
+png-implement@ccrc.wustl.edu or to randeg@alum.rpi.edu
 
 Glenn R-P
-
-Send comments/corrections/commendations to
-png-implement@dworkin.wustl.edu or to randeg@alumni.rpi.edu
-
-Glenn Randers-Pehrson
-libpng maintainer
-PNG Development Group

src/png/CHANGES

@@ -1,3 +1,4 @@
+
 CHANGES - changes for libpng
 
 version 0.2
@@ -123,6 +124,7 @@ version 0.90 [January, 1997]
      - all chunk handling routines have the same prototypes, so we will
        be able to handle all chunks via a callback mechanism
   try to fix Linux "setjmp" buffer size problems
+  removed png_large_malloc, png_large_free, and png_realloc functions.
 version 0.95 [March, 1997]
   fixed bug in pngwutil.c allocating "up_row" twice and "avg_row" never
   fixed bug in PNG file signature compares when start != 0
@@ -259,6 +261,7 @@ version 0.99h [March 6, 1998, evening]
   Minor changes to previous minor changes to pngtest.c
   Changed PNG_READ_NOT_FULLY_SUPPORTED to PNG_READ_TRANSFORMS_NOT_SUPPORTED
   and added PNG_PROGRESSIVE_READ_NOT_SUPPORTED macro
+  Added user transform capability
 version 1.00 [March 7, 1998]
   Changed several typedefs in pngrutil.c
   Added makefile.wat (Pawel Mrochen), updated makefile.tc3 (Willem van Schaik)
@@ -283,6 +286,871 @@ version 1.0.0b [March 13, 1998]
   Minor changes to makefile.s2x
   Removed #ifdef/#endif around a png_free() in pngread.c
 version 1.0.1 [March 14, 1998]
-   Changes makefile.s2x to reduce security risk of using a relative pathname
+  Changed makefile.s2x to reduce security risk of using a relative pathname
   Fixed some typos in the documentation (Greg).
   Fixed a problem with value of "channels" returned by png_read_update_info()
+version 1.0.1a [April 21, 1998]
+  Optimized Paeth calculations by replacing abs() function calls with intrinsics
+  plus other loop optimizations. Improves avg decoding speed by about 20%.
+  Commented out i386istic "align" compiler flags in makefile.lnx.
+  Reduced the default warning level in some makefiles, to make them consistent.
+  Removed references to IJG and JPEG in the ansi2knr.c copyright statement.
+  Fixed a bug in png_do_strip_filler with XXRRGGBB => RRGGBB transformation.
+  Added grayscale and 16-bit capability to png_do_read_filler().
+  Fixed a bug in pngset.c, introduced in version 0.99c, that sets rowbytes
+    too large when writing an image with bit_depth < 8 (Bob Dellaca).
+  Corrected some bugs in the experimental weighted filtering heuristics.
+  Moved a misplaced pngrutil code block that truncates tRNS if it has more
+    than num_palette entries -- test was done before num_palette was defined.
+  Fixed a png_convert_to_rfc1123() bug that converts day 31 to 0 (Steve Eddins).
+  Changed compiler flags in makefile.wat for better optimization (Pawel Mrochen).
+version 1.0.1b [May 2, 1998]
+  Relocated png_do_gray_to_rgb() within png_do_read_transformations() (Greg).
+  Relocated the png_composite macros from pngrtran.c to png.h (Greg).
+  Added makefile.sco (contributed by Mike Hopkirk).
+  Fixed two bugs (missing definitions of "istop") introduced in libpng-1.0.1a.
+  Fixed a bug in pngrtran.c that would set channels=5 under some circumstances.
+  More work on the Paeth-filtering, achieving imperceptible speedup (A Kleinert).
+  More work on loop optimization which may help when compiled with C++ compilers.
+  Added warnings when people try to use transforms they've defined out.
+  Collapsed 4 "i" and "c" loops into single "i" loops in pngrtran and pngwtran.
+  Revised paragraph about png_set_expand() in libpng.txt and libpng.3 (Greg)
+version 1.0.1c [May 11, 1998]
+  Fixed a bug in pngrtran.c (introduced in libpng-1.0.1a) where the masks for
+    filler bytes should have been 0xff instead of 0xf.
+  Added max_pixel_depth=32 in pngrutil.c when using FILLER with palette images.
+  Moved PNG_WRITE_WEIGHTED_FILTER_SUPPORTED and PNG_WRITE_FLUSH_SUPPORTED
+    out of the PNG_WRITE_TRANSFORMS_NOT_SUPPORTED block of pngconf.h
+  Added "PNG_NO_WRITE_TRANSFORMS" etc., as alternatives for *_NOT_SUPPORTED,
+    for consistency, in pngconf.h
+  Added individual "ifndef PNG_NO_[CAPABILITY]" in pngconf.h to make it easier
+    to remove unwanted capabilities via the compile line
+  Made some corrections to grammar (which, it's) in documentation (Greg).
+  Corrected example.c, use of row_pointers in png_write_image().
+version 1.0.1d [May 24, 1998]
+  Corrected several statements that used side effects illegally in pngrutil.c
+    and pngtrans.c, that were introduced in version 1.0.1b
+  Revised png_read_rows() to avoid repeated if-testing for NULL (A Kleinert)
+  More corrections to example.c, use of row_pointers in png_write_image()
+    and png_read_rows().
+  Added pngdll.mak and pngdef.pas to scripts directory, contributed by
+    Bob Dellaca, to make a png32bd.dll with Borland C++ 4.5
+  Fixed error in example.c with png_set_text: num_text is 3, not 2 (Guido V.)
+  Changed several loops from count-down to count-up, for consistency.
+version 1.0.1e [June 6, 1998]
+  Revised libpng.txt and libpng.3 description of png_set_read|write_fn(), and
+    added warnings when people try to set png_read_fn and png_write_fn in
+    the same structure.
+  Added a test such that png_do_gamma will be done when num_trans==0
+    for truecolor images that have defined a background.  This corrects an
+    error that was introduced in libpng-0.90 that can cause gamma processing
+    to be skipped.
+  Added tests in png.h to include "trans" and "trans_values" in structures
+    when PNG_READ_BACKGROUND_SUPPORTED or PNG_READ_EXPAND_SUPPORTED is defined.
+  Add png_free(png_ptr->time_buffer) in png_destroy_read_struct()
+  Moved png_convert_to_rfc_1123() from pngwrite.c to png.c
+  Added capability for user-provided malloc_fn() and free_fn() functions,
+    and revised pngtest.c to demonstrate their use, replacing the
+    PNGTEST_DEBUG_MEM feature.
+  Added makefile.w32, for Microsoft C++ 4.0 and later (Tim Wegner).
+version 1.0.2 [June 14, 1998]
+  Fixed two bugs in makefile.bor .
+version 1.0.2a [December 30, 1998]
+  Replaced and extended code that was removed from png_set_filler() in 1.0.1a.
+  Fixed a bug in png_do_filler() that made it fail to write filler bytes in
+    the left-most pixel of each row (Kevin Bracey).
+  Changed "static pngcharp tIME_string" to "static char tIME_string[30]"
+    in pngtest.c (Duncan Simpson).
+  Fixed a bug in pngtest.c that caused pngtest to try to write a tIME chunk
+    even when no tIME chunk was present in the source file.
+  Fixed a problem in pngrutil.c: gray_to_rgb didn't always work with 16-bit.
+  Fixed a problem in png_read_push_finish_row(), which would not skip some
+    passes that it should skip, for images that are less than 3 pixels high.
+  Interchanged the order of calls to png_do_swap() and png_do_shift()
+    in pngwtran.c (John Cromer).
+  Added #ifdef PNG_DEBUG/#endif surrounding use of PNG_DEBUG in png.h .
+  Changed "bad adaptive filter type" from error to warning in pngrutil.c .
+  Fixed a documentation error about default filtering with 8-bit indexed-color.
+  Separated the PNG_NO_STDIO macro into PNG_NO_STDIO and PNG_NO_CONSOLE_IO
+    (L. Peter Deutsch).
+  Added png_set_rgb_to_gray() and png_get_rgb_to_gray_status() functions.
+  Added png_get_copyright() and png_get_header_version() functions.
+  Revised comments on png_set_progressive_read_fn() in libpng.txt and example.c
+  Added information about debugging in libpng.txt and libpng.3 .
+  Changed "ln -sf" to "ln -s -f" in makefile.s2x, makefile.lnx, and makefile.sco.
+  Removed lines after Dynamic Dependencies" in makefile.aco .
+  Revised makefile.dec to make a shared library (Jeremie Petit).
+  Removed trailing blanks from all files.
+version 1.0.2a [January 6, 1999]
+  Removed misplaced #endif and #ifdef PNG_NO_EXTERN near the end of png.h
+  Added "if" tests to silence complaints about unused png_ptr in png.h and png.c
+  Changed "check_if_png" function in example.c to return true (nonzero) if PNG.
+  Changed libpng.txt to demonstrate png_sig_cmp() instead of png_check_sig()
+    which is obsolete.
+version 1.0.3 [January 14, 1999]
+  Added makefile.hux, for Hewlett Packard HPUX 10.20 and 11.00 (Jim Rice)
+  Added a statement of Y2K compliance in png.h, libpng.3, and Y2KINFO.
+version 1.0.3a [August 12, 1999]
+  Added check for PNG_READ_INTERLACE_SUPPORTED in pngread.c; issue a warning
+     if an attempt is made to read an interlaced image when it's not supported.
+  Added check if png_ptr->trans is defined before freeing it in pngread.c
+  Modified the Y2K statement to include versions back to version 0.71
+  Fixed a bug in the check for valid IHDR bit_depth/color_types in pngrutil.c
+  Modified makefile.wat (added -zp8 flag, ".symbolic", changed some comments)
+  Replaced leading blanks with tab characters in makefile.hux
+  Changed "dworkin.wustl.edu" to "ccrc.wustl.edu" in various documents.
+  Changed (float)red and (float)green to (double)red, (double)green
+     in png_set_rgb_to_gray() to avoid "promotion" problems in AIX.
+  Fixed a bug in pngconf.h that omitted <stdio.h> when PNG_DEBUG==0 (K Bracey).
+  Reformatted libpng.3 and libpngpf.3 with proper fonts (script by J. vanZandt).
+  Updated documentation to refer to the PNG-1.2 specification.
+  Removed ansi2knr.c and left pointers to the latest source for ansi2knr.c
+    in makefile.knr, INSTALL, and README (L. Peter Deutsch)
+  Fixed bugs in calculation of the length of rowbytes when adding alpha
+    channels to 16-bit images, in pngrtran.c (Chris Nokleberg)
+  Added function png_set_user_transform_info() to store user_transform_ptr,
+    user_depth, and user_channels into the png_struct, and a function
+    png_get_user_transform_ptr() to retrieve the pointer (Chris Nokleberg)
+  Added function png_set_empty_plte_permitted() to make libpng useable
+    in MNG applications.
+  Corrected the typedef for png_free_ptr in png.h (Jesse Jones).
+  Correct gamma with srgb is 45455 instead of 45000 in pngrutil.c, to be
+    consistent with PNG-1.2, and allow variance of 500 before complaining.
+  Added assembler code contributed by Intel in file pngvcrd.c and modified
+    makefile.w32 to use it (Nirav Chhatrapati, INTEL Corporation, Gilles Vollant)
+  Changed "ln -s -f" to "ln -f -s" in the makefiles to make Solaris happy.
+  Added some aliases for png_set_expand() in pngrtran.c, namely
+    png_set_expand_PLTE(), png_set_expand_depth(), and png_set_expand_tRNS()
+    (Greg Roelofs, in "PNG: The Definitive Guide").
+  Added makefile.beo for BEOS on X86, contributed by Sander Stok.
+version 1.0.3b [August 26, 1999]
+  Replaced 2147483647L several places with PNG_MAX_UINT macro, defined in png.h
+  Changed leading blanks to tabs in all makefiles.
+  Define PNG_USE_PNGVCRD in makefile.w32, to get MMX assembler code.
+  Made alternate versions of  png_set_expand() in pngrtran.c, namely
+    png_set_gray_1_2_4_to_8, png_set_palette_to_rgb, and png_set_tRNS_to_alpha
+    (Greg Roelofs, in "PNG: The Definitive Guide").  Deleted the 1.0.3a aliases.
+  Relocated start of 'extern "C"' block in png.h so it doesn't include pngconf.h
+  Revised calculation of num_blocks in pngmem.c to avoid a potentially
+    negative shift distance, whose results are undefined in the C language.
+  Added a check in pngset.c to prevent writing multiple tIME chunks.
+  Added a check in pngwrite.c to detect invalid small window_bits sizes.
+version 1.0.3d [September 4, 1999]
+  Fixed type casting of igamma in pngrutil.c
+  Added new png_expand functions to scripts/pngdef.pas and pngos2.def
+  Added a demo read_user_transform_fn that examines the row filters in pngtest.c
+version 1.0.4 [September 24, 1999]
+  Define PNG_ALWAYS_EXTERN in pngconf.h if __STDC__ is defined
+  Delete #define PNG_INTERNAL and include "png.h" from pngasmrd.h
+  Made several minor corrections to pngtest.c
+  Renamed the makefiles with longer but more user friendly extensions.
+  Copied the PNG copyright and license to a separate LICENSE file.
+  Revised documentation, png.h, and example.c to remove reference to
+    "viewing_gamma" which no longer appears in the PNG specification.
+  Revised pngvcrd.c to use MMX code for interlacing only on the final pass.
+  Updated pngvcrd.c to use the faster C filter algorithms from libpng-1.0.1a
+  Split makefile.win32vc into two versions, makefile.vcawin32 (uses MMX
+    assembler code) and makefile.vcwin32 (doesn't).
+  Added a CPU timing report to pngtest.c (enabled by defining PNGTEST_TIMING)
+  Added a copy of pngnow.png to the distribution.
+version 1.0.4a [September 25, 1999]
+  Increase max_pixel_depth in pngrutil.c if a user transform needs it.
+  Changed several division operations to right-shifts in pngvcrd.c
+version 1.0.4b [September 30, 1999]
+  Added parentheses in line 3732 of pngvcrd.c
+  Added a comment in makefile.linux warning about buggy -O3 in pgcc 2.95.1
+version 1.0.4c [October 1, 1999]
+  Added a "png_check_version" function in png.c and pngtest.c that will generate
+    a helpful compiler error if an old png.h is found in the search path.
+  Changed type of png_user_transform_depth|channels from int to png_byte.
+version 1.0.4d [October 6, 1999]
+  Changed 0.45 to 0.45455 in png_set_sRGB()
+  Removed unused PLTE entries from pngnow.png
+  Re-enabled some parts of pngvcrd.c (png_combine_row) that work properly.
+version 1.0.4e [October 10, 1999]
+  Fixed sign error in pngvcrd.c (Greg Roelofs)
+  Replaced some instances of memcpy with simple assignments in pngvcrd (GR-P)
+version 1.0.4f [October 15, 1999]
+  Surrounded example.c code with #if 0 .. #endif to prevent people from
+    inadvertently trying to compile it.
+  Changed png_get_header_version() from a function to a macro in png.h
+  Added type casting mostly in pngrtran.c and pngwtran.c
+  Removed some pointless "ptr = NULL" in pngmem.c
+  Added a "contrib" directory containing the source code from Greg's book.
+version 1.0.5 [October 15, 1999]
+  Minor editing of the INSTALL and README files.
+version 1.0.5a [October 23, 1999]
+  Added contrib/pngsuite and contrib/pngminus (Willem van Schaik)
+  Fixed a typo in the png_set_sRGB() function call in example.c (Jan Nijtmans)
+  Further optimization and bugfix of pngvcrd.c
+  Revised pngset.c so that it does not allocate or free memory in the user's
+    text_ptr structure.  Instead, it makes its own copy.
+  Created separate write_end_info_struct in pngtest.c for a more severe test.
+  Added code in pngwrite.c to free info_ptr->text[i].key to stop a memory leak.
+version 1.0.5b [November 23, 1999]
+  Moved PNG_FLAG_HAVE_CHUNK_HEADER, PNG_FLAG_BACKGROUND_IS_GRAY and
+    PNG_FLAG_WROTE_tIME from flags to mode.
+  Added png_write_info_before_PLTE() function.
+  Fixed some typecasting in contrib/gregbook/*.c
+  Updated scripts/makevms.com and added makevms.com to contrib/gregbook
+    and contrib/pngminus (Martin Zinser)
+version 1.0.5c [November 26, 1999]
+  Moved png_get_header_version from png.h to png.c, to accomodate ansi2knr.
+  Removed all global arrays (according to PNG_NO_GLOBAL_ARRAYS macro), to
+    accomodate making DLL's: Moved usr_png_ver from global variable to function
+    png_get_header_ver() in png.c.  Moved png_sig to png_sig_bytes in png.c and
+    eliminated use of png_sig in pngwutil.c.  Moved the various png_CHNK arrays
+    into pngtypes.h.  Eliminated use of global png_pass arrays.  Declared the
+    png_CHNK and png_pass arrays to be "const".  Made the global arrays
+    available to applications (although none are used in libpng itself) when
+    PNG_NO_GLOBAL_ARRAYS is not defined or when PNG_GLOBAL_ARRAYS is defined.
+  Removed some extraneous "-I" from contrib/pngminus/makefile.std
+  Changed the PNG_sRGB_INTENT macros in png.h to be consistent with PNG-1.2.
+  Change PNG_SRGB_INTENT to PNG_sRGB_INTENT in libpng.txt and libpng.3
+version 1.0.5d [November 29, 1999]
+  Add type cast (png_const_charp) two places in png.c
+  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.
+  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
+    structure; refactored the inflate/deflate support to make adding new chunks
+    with trailing compressed parts easier in the future, and added new functions
+    png_free_iCCP, png_free_pCAL, png_free_sPLT, png_free_text, png_get_iCCP,
+    png_get_spalettes, png_set_iCCP, png_set_spalettes (Eric S. Raymond).
+  NOTE: Applications that write text chunks MUST define png_text->lang
+    before calling png_set_text(). It must be set to NULL if you want to
+    write tEXt or zTXt chunks.  If you want your application to be able to
+    run with older versions of libpng, use
+
+      #ifdef PNG_iTXt_SUPPORTED
+         png_text[i].lang = NULL;
+      #endif
+
+  Changed png_get_oFFs() and png_set_oFFs() to use signed rather than unsigned
+    offsets (Eric S. Raymond).
+  Combined PNG_READ_cHNK_SUPPORTED and PNG_WRITE_cHNK_SUPPORTED macros into
+    PNG_cHNK_SUPPORTED and combined the three types of PNG_text_SUPPORTED
+    macros, leaving the separate macros also available.
+  Removed comments on #endifs at the end of many short, non-nested #if-blocks.
+version 1.0.5f [December 6, 1999]
+  Changed makefile.solaris to issue a warning about potential problems when
+    the ucb "ld" is in the path ahead of the ccs "ld".
+  Removed "- [date]" from the "synopsis" line in libpng.3 and libpngpf.3.
+  Added sCAL chunk support (Eric S. Raymond).
+version 1.0.5g [December 7, 1999]
+  Fixed "png_free_spallettes" typo in png.h
+  Added code to handle new chunks in pngpread.c
+  Moved PNG_CHNK string macro definitions outside of PNG_NO_EXTERN block
+  Added "translated_key" to png_text structure and png_write_iTXt().
+  Added code in pngwrite.c to work around a newly discovered zlib bug.
+version 1.0.5h [December 10, 1999]
+  NOTE: regarding the note for version 1.0.5e, the following must also
+    be included in your code:
+        png_text[i].translated_key = NULL;
+  Unknown chunk handling is now supported.
+  Option to eliminate all floating point support was added.  Some new
+    fixed-point functions such as png_set_gAMA_fixed() were added.
+  Expanded tabs and removed trailing blanks in source files.
+version 1.0.5i [December 13, 1999]
+  Added some type casts to silence compiler warnings.
+  Renamed "png_free_spalette" to "png_free_spalettes" for consistency.
+  Removed leading blanks from a #define in pngvcrd.c
+  Added some parameters to the new png_set_keep_unknown_chunks() function.
+  Added a test for up->location != 0 in the first instance of writing
+    unknown chunks in pngwrite.c
+  Changed "num" to "i" in png_free_spalettes() and png_free_unknowns() to
+    prevent recursion.
+  Added png_free_hIST() function.
+  Various patches to fix bugs in the sCAL and integer cHRM processing,
+    and to add some convenience macros for use with sCAL.
+version 1.0.5j [December 21, 1999]
+  Changed "unit" parameter of png_write_sCAL from png_byte to int, to work
+    around buggy compilers.
+  Added new type "png_fixed_point" for integers that hold float*100000 values
+  Restored backward compatibility of tEXt/zTXt chunk processing:
+    Restored the first four members of png_text to the same order as v.1.0.5d.
+    Added members "lang_key" and "itxt_length" to png_text struct.  Set
+    text_length=0 when "text" contains iTXt data.  Use the "compression"
+    member to distinguish among tEXt/zTXt/iTXt types.  Added
+    PNG_ITXT_COMPRESSION_NONE (1) and PNG_ITXT_COMPRESSION_zTXt(2) macros.
+    The "Note" above, about backward incompatibility of libpng-1.0.5e, no
+    longer applies.
+  Fixed png_read|write_iTXt() to read|write parameters in the right order,
+    and to write the iTXt chunk after IDAT if it appears in the end_ptr.
+  Added pnggccrd.c, version of pngvcrd.c Intel assembler for gcc (Greg Roelofs)
+  Reversed the order of trying to write floating-point and fixed-point gAMA.
+version 1.0.5k [December 27, 1999]
+  Added many parentheses, e.g., "if (a && b & c)" becomes "if (a && (b & c))"
+  Added png_handle_as_unknown() function (Glenn)
+  Added png_free_chunk_list() function and chunk_list and num_chunk_list members
+    of png_ptr.
+  Eliminated erroneous warnings about multiple sPLT chunks and sPLT-after-PLTE.
+  Fixed a libpng-1.0.5h bug in pngrutil.c that was issuing erroneous warnings
+    about ignoring incorrect gAMA with sRGB (gAMA was in fact not ignored)
+  Added png_free_tRNS(); png_set_tRNS() now malloc's its own trans array (ESR).
+  Define png_get_int_32 when oFFs chunk is supported as well as when pCAL is.
+  Changed type of proflen from png_int_32 to png_uint_32 in png_get_iCCP().
+version 1.0.5l [January 1, 2000]
+  Added functions png_set_read_user_chunk_fn() and png_get_user_chunk_ptr()
+    for setting a callback function to handle unknown chunks and for
+    retrieving the associated user pointer (Glenn).
+version 1.0.5m [January 7, 2000]
+  Added high-level functions png_read_png(), png_write_png(), png_free_pixels().
+version 1.0.5n [January 9, 2000]
+  Added png_free_PLTE() function, and modified png_set_PLTE() to malloc its
+    own memory for info_ptr->palette.  This makes it safe for the calling
+    application to free its copy of the palette any time after it calls
+    png_set_PLTE().
+version 1.0.5o [January 20, 2000]
+  Cosmetic changes only (removed some trailing blanks and TABs)
+version 1.0.5p [January 31, 2000]
+  Renamed pngdll.mak to makefile.bd32
+  Cosmetic changes in pngtest.c
+version 1.0.5q [February 5, 2000]
+  Relocated the makefile.solaris warning about PATH problems.
+  Fixed pngvcrd.c bug by pushing/popping registers in mmxsupport (Bruce Oberg)
+  Revised makefile.gcmmx
+  Added PNG_SETJMP_SUPPORTED, PNG_SETJMP_NOT_SUPPORTED, and PNG_ABORT() macros
+version 1.0.5r [February 7, 2000]
+  Removed superfluous prototype for png_get_itxt from png.h
+  Fixed a bug in pngrtran.c that improperly expanded the background color.
+  Return *num_text=0 from png_get_text() when appropriate, and fix documentation
+    of png_get_text() in libpng.txt/libpng.3.
+version 1.0.5s [February 18, 2000]
+  Added "png_jmp_env()" macro to pngconf.h, to help people migrate to the
+    new error handler that's planned for the next libpng release, and changed
+    example.c, pngtest.c, and contrib programs to use this macro.
+  Revised some of the DLL-export macros in pngconf.h (Greg Roelofs)
+  Fixed a bug in png_read_png() that caused it to fail to expand some images
+    that it should have expanded.
+  Fixed some mistakes in the unused and undocumented INCH_CONVERSIONS functions
+    in pngget.c
+  Changed the allocation of palette, history, and trans arrays back to
+    the version 1.0.5 method (linking instead of copying) which restores
+    backward compatibility with version 1.0.5.  Added some remarks about
+    that in example.c.  Added "free_me" member to info_ptr and png_ptr
+    and added png_free_data() function.
+  Updated makefile.linux and makefile.gccmmx to make directories conditionally.
+  Made cosmetic changes to pngasmrd.h
+  Added png_set_rows() and png_get_rows(), for use with png_read|write_png().
+  Modified png_read_png() to allocate info_ptr->row_pointers only if it
+    hasn't already been allocated.
+version 1.0.5t [March 4, 2000]
+  Changed png_jmp_env() migration aiding macro to png_jmpbuf().
+  Fixed "interlace" typo (should be "interlaced") in contrib/gregbook/read2-x.c
+  Fixed bug with use of PNG_BEFORE_IHDR bit in png_ptr->mode, introduced when
+    PNG_FLAG_HAVE_CHUNK_HEADER was moved into png_ptr->mode in version 1.0.5b
+  Files in contrib/gregbook were revised to use png_jmpbuf() and to select
+    a 24-bit visual if one is available, and to allow abbreviated options.
+  Files in contrib/pngminus were revised to use the png_jmpbuf() macro.
+  Removed spaces in makefile.linux and makefile.gcmmx, introduced in 1.0.5s
+version 1.0.5u [March 5, 2000]
+  Simplified the code that detects old png.h in png.c and pngtest.c
+  Renamed png_spalette (_p, _pp) to png_sPLT_t (_tp, _tpp)
+  Increased precision of rgb_to_gray calculations from 8 to 15 bits and
+    added png_set_rgb_to_gray_fixed() function.
+  Added makefile.bc32 (32-bit Borland C++, C mode)
+version 1.0.5v [March 11, 2000]
+  Added some parentheses to the png_jmpbuf macro definition.
+  Updated references to the zlib home page, which has moved to freesoftware.com.
+  Corrected bugs in documentation regarding png_read_row() and png_write_row().
+  Updated documentation of png_rgb_to_gray calculations in libpng.3/libpng.txt.
+  Renamed makefile.borland,turboc3 back to makefile.bor,tc3 as in version 1.0.3,
+    revised borland makefiles; added makefile.ibmvac3 and makefile.gcc (Cosmin)
+version 1.0.6 [March 20, 2000]
+  Minor revisions of makefile.bor, libpng.txt, and gregbook/rpng2-win.c
+  Added makefile.sggcc (SGI IRIX with gcc)
+version 1.0.6d [April 7, 2000]
+  Changed sprintf() to strcpy() in png_write_sCAL_s() to work without STDIO
+  Added data_length parameter to png_decompress_chunk() function
+  Revised documentation to remove reference to abandoned png_free_chnk functions
+  Fixed an error in png_rgb_to_gray_fixed()
+  Revised example.c, usage of png_destroy_write_struct().
+  Renamed makefile.ibmvac3 to makefile.ibmc, added libpng.icc IBM project file
+  Added a check for info_ptr->free_me&PNG_FREE_TEXT when freeing text in png.c
+  Simplify png_sig_bytes() function to remove use of non-ISO-C strdup().
+version 1.0.6e [April 9, 2000]
+  Added png_data_freer() function.
+  In the code that checks for over-length tRNS chunks, added check of
+    info_ptr->num_trans as well as png_ptr->num_trans (Matthias Benckmann)
+  Minor revisions of libpng.txt/libpng.3.
+  Check for existing data and free it if the free_me flag is set, in png_set_*()
+    and png_handle_*().
+  Only define PNG_WEIGHTED_FILTERS_SUPPORTED when PNG_FLOATING_POINT_SUPPORTED
+    is defined.
+  Changed several instances of PNG_NO_CONSOLE_ID to PNG_NO_STDIO in pngrutil.c
+    and mentioned the purposes of the two macros in libpng.txt/libpng.3.
+version 1.0.6f [April 14, 2000]
+  Revised png_set_iCCP() and png_set_rows() to avoid prematurely freeing data.
+  Add checks in png_set_text() for NULL members of the input text structure.
+  Revised libpng.txt/libpng.3.
+  Removed superfluous prototype for png_set_itxt from png.h
+  Removed "else" from pngread.c, after png_error(), and changed "0" to "length".
+  Changed several png_errors about malformed ancillary chunks to png_warnings.
+version 1.0.6g [April 24, 2000]
+  Added png_pass-* arrays to pnggccrd.c when PNG_USE_LOCAL_ARRAYS is defined.
+  Relocated paragraph about png_set_background() in libpng.3/libpng.txt
+    and other revisions (Matthias Benckmann)
+  Relocated info_ptr->free_me, png_ptr->free_me, and other info_ptr and
+    png_ptr members to restore binary compatibility with libpng-1.0.5
+    (breaks compatibility with libpng-1.0.6).
+version 1.0.6h [April 24, 2000]
+  Changed shared library so-number pattern from 2.x.y.z to xy.z (this builds
+    libpng.so.10 & libpng.so.10.6h instead of libpng.so.2 & libpng.so.2.1.0.6h)
+    This is a temporary change for test purposes.
+version 1.0.6i [May 2, 2000]
+  Rearranged some members at the end of png_info and png_struct, to put
+    unknown_chunks_num and free_me within the original size of the png_structs
+    and free_me, png_read_user_fn, and png_free_fn within the original png_info,
+    because some old applications allocate the structs directly instead of
+    using png_create_*().
+  Added documentation of user memory functions in libpng.txt/libpng.3
+  Modified png_read_png so that it will use user_allocated row_pointers
+    if present, unless free_me directs that it be freed, and added description
+    of the use of png_set_rows() and png_get_rows() in libpng.txt/libpng.3.
+  Added PNG_LEGACY_SUPPORTED macro, and #ifdef out all new (since version
+    1.00) members of png_struct and png_info, to regain binary compatibility
+    when you define this macro.  Capabilities lost in this event
+    are user transforms (new in version 1.0.0),the user transform pointer
+    (new in version 1.0.2), rgb_to_gray (new in 1.0.5), iCCP, sCAL, sPLT,
+    the high-level interface, and unknown chunks support (all new in 1.0.6).
+    This was necessary because of old applications that allocate the structs
+    directly as authors were instructed to do in libpng-0.88 and earlier,
+    instead of using png_create_*().
+  Added modes PNG_CREATED_READ_STRUCT and PNG_CREATED_WRITE_STRUCT which
+    can be used to detect codes that directly allocate the structs, and
+    code to check these modes in png_read_init() and png_write_init() and
+    generate a libpng error if the modes aren't set and PNG_LEGACY_SUPPORTED
+    was not defined.
+  Added makefile.intel and updated makefile.watcom (Pawel Mrochen)
+version 1.0.6j [May 3, 2000]
+  Overloaded png_read_init() and png_write_init() with macros that convert
+    calls to png_read_init_2() or png_write_init_2() that check the version
+    and structure sizes.
+version 1.0.7beta11 [May 7, 2000]
+  Removed the new PNG_CREATED_READ_STRUCT and PNG_CREATED_WRITE_STRUCT modes
+    which are no longer used.
+  Eliminated the three new members of png_text when PNG_LEGACY_SUPPORTED is
+    defined or when neither PNG_READ_iTXt_SUPPORTED nor PNG_WRITE_iTXT_SUPPORTED
+    is defined.
+  Made PNG_NO_READ|WRITE_iTXt the default setting, to avoid memory
+    overrun when old applications fill the info_ptr->text structure directly.
+  Added PNGAPI macro, and added it to the definitions of all exported functions.
+  Relocated version macro definitions ahead of the includes of zlib.h and
+    pngconf.h in png.h.
+version 1.0.7beta12 [May 12, 2000]
+  Revised pngset.c to avoid a problem with expanding the png_debug macro.
+  Deleted some extraneous defines from pngconf.h
+  Made PNG_NO_CONSOLE_IO the default condition when PNG_BUILD_DLL is defined.
+  Use MSC _RPTn debugging instead of fprintf if _MSC_VER is defined.
+  Added png_access_version_number() function.
+  Check for mask&PNG_FREE_CHNK (for TEXT, SCAL, PCAL) in png_free_data().
+  Expanded libpng.3/libpng.txt information about png_data_freer().
+version 1.0.7beta14 [May 17, 2000] (beta13 was not published)
+  Changed pnggccrd.c and pngvcrd.c to handle bad adaptive filter types as
+    warnings instead of errors, as pngrutil.c does.
+  Set the PNG_INFO_IDAT valid flag in png_set_rows() so png_write_png()
+    will actually write IDATs.
+  Made the default PNG_USE_LOCAL_ARRAYS depend on PNG_DLL instead of WIN32.
+  Make png_free_data() ignore its final parameter except when freeing data
+    that can have multiple instances (text, sPLT, unknowns).
+  Fixed a new bug in png_set_rows().
+  Removed info_ptr->valid tests from png_free_data(), as in version 1.0.5.
+  Added png_set_invalid() function.
+  Fixed incorrect illustrations of png_destroy_write_struct() in example.c.
+version 1.0.7beta15 [May 30, 2000]
+  Revised the deliberately erroneous Linux setjmp code in pngconf.h to produce
+    fewer error messages.
+  Rearranged checks for Z_OK to check the most likely path first in pngpread.c
+    and pngwutil.c.
+  Added checks in pngtest.c for png_create_*() returning NULL, and mentioned
+    in libpng.txt/libpng.3 the need for applications to check this.
+  Changed names of png_default_*() functions in pngtest to pngtest_*().
+  Changed return type of png_get_x|y_offset_*() from png_uint_32 to png_int_32.
+  Fixed some bugs in the unused PNG_INCH_CONVERSIONS functions in pngget.c
+  Set each pointer to NULL after freeing it in png_free_data().
+  Worked around a problem in pngconf.h; AIX's strings.h defines an "index"
+    macro that conflicts with libpng's png_color_16.index. (Dimitri Papadapoulos)
+  Added "msvc" directory with MSVC++ project files (Simon-Pierre Cadieux).
+version 1.0.7beta16 [June 4, 2000]
+  Revised the workaround of AIX string.h "index" bug.
+  Added a check for overlength PLTE chunk in pngrutil.c.
+  Added PNG_NO_POINTER_INDEXING macro to use array-indexing instead of pointer
+    indexing in pngrutil.c and pngwutil.c to accommodate a buggy compiler.
+  Added a warning in png_decompress_chunk() when it runs out of data, e.g.
+    when it tries to read an erroneous PhotoShop iCCP chunk.
+  Added PNG_USE_DLL macro.
+  Revised the copyright/disclaimer/license notice.
+  Added contrib/msvctest directory
+version 1.0.7rc1 [June 9, 2000]
+  Corrected the definition of PNG_TRANSFORM_INVERT_ALPHA  (0x0400 not 0x0200)
+  Added contrib/visupng directory (Willem van Schaik)
+version 1.0.7beta18 [June 23, 2000]
+  Revised PNGAPI definition, and pngvcrd.c to work with __GCC__
+    and do not redefine PNGAPI if it is passed in via a compiler directive.
+  Revised visupng/PngFile.c to remove returns from within the Try block.
+  Removed leading underscores from "_PNG_H" and "_PNG_SAVE_BSD_SOURCE" macros.
+  Updated contrib/visupng/cexcept.h to version 1.0.0.
+  Fixed bugs in pngwrite.c and pngwutil.c that prevented writing iCCP chunks.
+version 1.0.7rc2 [June 28, 2000]
+  Updated license to include disclaimers required by UCITA.
+  Fixed "DJBPP" typo in pnggccrd.c introduced in beta18.
+version 1.0.7 [July 1, 2000]
+  Revised the definition of "trans_values" in libpng.3/libpng.txt
+version 1.0.8beta1 [July 8, 2000]
+  Added png_free(png_ptr, key) two places in pngpread.c to stop memory leaks.
+  Changed PNG_NO_STDIO to PNG_NO_CONSOLE_IO, several places in pngrutil.c and
+     pngwutil.c.
+  Changed PNG_EXPORT_VAR to use PNG_IMPEXP, in pngconf.h.
+  Removed unused "#include <assert.h>" from png.c
+  Added WindowsCE support.
+  Revised pnggccrd.c to work with gcc-2.95.2 and in the Cygwin environment.
+version 1.0.8beta2 [July 10, 2000]
+  Added project files to the wince directory and made further revisions
+     of pngtest.c, pngrio.c, and pngwio.c in support of WindowsCE.
+version 1.0.8beta3 [July 11, 2000]
+  Only set the PNG_FLAG_FREE_TRNS or PNG_FREE_TRNS flag in png_handle_tRNS()
+     for indexed-color input files to avoid potential double-freeing trans array
+     under some unusual conditions; problem was introduced in version 1.0.6f.
+  Further revisions to pngtest.c and files in the wince subdirectory.
+version 1.0.8beta4 [July 14, 2000]
+  Added the files pngbar.png and pngbar.jpg to the distribution.
+  Added makefile.cygwin, and cygwin support in pngconf.h
+  Added PNG_NO_ZALLOC_ZERO macro (makes png_zalloc skip zeroing memory)
+version 1.0.8rc1 [July 16, 2000]
+  Revised png_debug() macros and statements to eliminate compiler warnings.
+version 1.0.8 [July 24, 2000]
+  Added png_flush() in pngwrite.c, after png_write_IEND().
+  Updated makefile.hpux to build a shared library.
+version 1.0.9beta1 [November 10, 2000]
+  Fixed typo in scripts/makefile.hpux
+  Updated makevms.com in scripts and contrib/* and contrib/* (Martin Zinser)
+  Fixed seqence-point bug in contrib/pngminus/png2pnm (Martin Zinser)
+  Changed "cdrom.com" in documentation to "libpng.org"
+  Revised pnggccrd.c to get it all working, and updated makefile.gcmmx (Greg).
+  Changed type of "params" from voidp to png_voidp in png_read|write_png().
+  Make sure PNGAPI and PNG_IMPEXP are defined in pngconf.h.
+  Revised the 3 instances of WRITEFILE in pngtest.c.
+  Relocated "msvc" and "wince" project subdirectories into "dll" subdirectory.
+  Updated png.rc in dll/msvc project
+  Revised makefile.dec to define and use LIBPATH and INCPATH
+  Increased size of global png_libpng_ver[] array from 12 to 18 chars.
+  Made global png_libpng_ver[], png_sig[] and png_pass_*[] arrays const.
+  Removed duplicate png_crc_finish() from png_handle_bKGD() function.
+  Added a warning when application calls png_read_update_info() multiple times.
+  Revised makefile.cygwin
+  Fixed bugs in iCCP support in pngrutil.c and pngwutil.c.
+  Replaced png_set_empty_plte_permitted() with png_permit_mng_features().
+version 1.0.9beta2 [November 19, 2000]
+  Renamed the "dll" subdirectory "projects".
+  Added borland project files to "projects" subdirectory.
+  Set VS_FF_PRERELEASE and VS_FF_PATCHED flags in msvc/png.rc when appropriate.
+  Add error message in png_set_compression_buffer_size() when malloc fails.
+version 1.0.9beta3 [November 23, 2000]
+  Revised PNG_LIBPNG_BUILD_TYPE macro in png.h, used in the msvc project.
+  Removed the png_flush() in pngwrite.c that crashes some applications
+    that don't set png_output_flush_fn.
+  Added makefile.macosx and makefile.aix to scripts directory.
+version 1.0.9beta4 [December 1, 2000]
+  Change png_chunk_warning to png_warning in png_check_keyword().
+  Increased the first part of msg buffer from 16 to 18 in png_chunk_error().
+version 1.0.9beta5 [December 15, 2000]
+  Added support for filter method 64 (for PNG datastreams embedded in MNG).
+version 1.0.9beta6 [December 18, 2000]
+  Revised png_set_filter() to accept filter method 64 when appropriate.
+  Added new PNG_HAVE_PNG_SIGNATURE bit to png_ptr->mode and use it to
+    help prevent applications from using MNG features in PNG datastreams.
+  Added png_permit_mng_features() function.
+  Revised libpng.3/libpng.txt.  Changed "filter type" to "filter method".
+version 1.0.9rc1 [December 23, 2000]
+  Revised test for PNG_HAVE_PNG_SIGNATURE in pngrutil.c
+  Fixed error handling of unknown compression type in png_decompress_chunk().
+  In pngconf.h, define __cdecl when _MSC_VER is defined.
+version 1.0.9beta7 [December 28, 2000]
+  Changed PNG_TEXT_COMPRESSION_zTXt to PNG_COMPRESSION_TYPE_BASE several places.
+  Revised memory management in png_set_hIST and png_handle_hIST in a backward
+    compatible manner.  PLTE and tRNS were revised similarly.
+  Revised the iCCP chunk reader to ignore trailing garbage.
+version 1.0.9beta8 [January 12, 2001]
+  Moved pngasmrd.h into pngconf.h.
+  Improved handling of out-of-spec garbage iCCP chunks generated by PhotoShop.
+version 1.0.9beta9 [January 15, 2001]
+  Added png_set_invalid, png_permit_mng_features, and png_mmx_supported to
+    wince and msvc project module definition files.
+  Minor revision of makefile.cygwin.
+  Fixed bug with progressive reading of narrow interlaced images in pngpread.c
+version 1.0.9beta10 [January 16, 2001]
+  Do not typedef png_FILE_p in pngconf.h when PNG_NO_STDIO is defined.
+  Fixed "png_mmx_supported" typo in project definition files.
+version 1.0.9beta11 [January 19, 2001]
+  Updated makefile.sgi to make shared library.
+  Removed png_mmx_support() function and disabled PNG_MNG_FEATURES_SUPPORTED
+    by default, for the benefit of DLL forward compatibility.  These will
+    be re-enabled in version 1.2.0.
+version 1.0.9rc2 [January 22, 2001]
+  Revised cygwin support.
+version 1.0.9 [January 31, 2001]
+  Added check of cygwin's ALL_STATIC in pngconf.h
+  Added "-nommx" parameter to contrib/gregbook/rpng2-win and rpng2-x demos.
+version 1.0.10beta1 [March 14, 2001]
+  Revised makefile.dec, makefile.sgi, and makefile.sggcc; added makefile.hpgcc.
+  Reformatted libpng.3 to eliminate bad line breaks.
+  Added checks for _mmx_supported in the read_filter_row function of pnggccrd.c
+  Added prototype for png_mmx_support() near the top of pnggccrd.c
+  Moved some error checking from png_handle_IHDR to png_set_IHDR.
+  Added PNG_NO_READ_SUPPORTED and PNG_NO_WRITE_SUPPORTED macros.
+  Revised png_mmx_support() function in pnggccrd.c
+  Restored version 1.0.8 PNG_WRITE_EMPTY_PLTE_SUPPORTED behavior in pngwutil.c
+  Fixed memory leak in contrib/visupng/PngFile.c
+  Fixed bugs in png_combine_row() in pnggccrd.c and pngvcrd.c (C version)
+  Added warnings when retrieving or setting gamma=0.
+  Increased the first part of msg buffer from 16 to 18 in png_chunk_warning().
+version 1.0.10rc1 [March 23, 2001]
+  Changed all instances of memcpy, strcpy, and strlen to png_memcpy, png_strcpy,
+    and png_strlen.
+  Revised png_mmx_supported() function in pnggccrd.c to return proper value.
+  Fixed bug in progressive reading (pngpread.c) with small images (height < 8).
+version 1.0.10 [March 30, 2001]
+  Deleted extraneous space (introduced in 1.0.9) from line 42 of makefile.cygwin
+  Added beos project files (Chris Herborth)
+version 1.0.11beta1 [April 3, 2001]
+  Added type casts on several png_malloc() calls (Dimitri Papadapoulos).
+  Removed a no-longer needed AIX work-around from pngconf.h
+  Changed several "//" single-line comments to C-style in pnggccrd.c
+version 1.0.11beta2 [April 11, 2001]
+  Removed PNGAPI from several functions whose prototypes did not have PNGAPI.
+  Updated scripts/pngos2.def
+version 1.0.11beta3 [April 14, 2001]
+  Added checking the results of many instances of png_malloc() for NULL
+version 1.0.11beta4 [April 20, 2001]
+  Undid the changes from version 1.0.11beta3.  Added a check for NULL return
+    from user's malloc_fn().
+  Removed some useless type casts of the NULL pointer.
+  Added makefile.netbsd
+version 1.0.11 [April 27, 2001]
+  Revised makefile.netbsd
+version 1.0.12beta1 [May 14, 2001]
+  Test for Windows platform in pngconf.h when including malloc.h (Emmanuel Blot)
+  Updated makefile.cygwin and handling of Cygwin's ALL_STATIC in pngconf.h
+  Added some never-to-be-executed code in pnggccrd.c to quiet compiler warnings.
+  Eliminated the png_error about apps using png_read|write_init().  Instead,
+    libpng will reallocate the png_struct and info_struct if they are too small.
+    This retains future binary compatibility for old applications written for
+    libpng-0.88 and earlier.
+version 1.2.0beta1 [May 6, 2001]
+  Bumped DLLNUM to 2.
+  Re-enabled PNG_MNG_FEATURES_SUPPORTED and enabled PNG_ASSEMBLER_CODE_SUPPORTED
+    by default.
+  Added runtime selection of MMX features.
+  Added png_set_strip_error_numbers function and related macros.
+version 1.2.0beta2 [May 7, 2001]
+  Finished merging 1.2.0beta1 with version 1.0.11
+  Added a check for attempts to read or write PLTE in grayscale PNG datastreams.
+version 1.2.0beta3 [May 17, 2001]
+  Enabled user memory function by default.
+  Modified png_create_struct so it passes user mem_ptr to user memory allocator.
+  Increased png_mng_features flag from png_byte to png_uint_32.
+  Bumped shared-library (so-number) and dll-number to 3.
+version 1.2.0beta4 [June 23, 2001]
+  Check for missing profile length field in iCCP chunk and free chunk_data
+     in case of truncated iCCP chunk.
+  Bumped shared-library number to 3 in makefile.sgi and makefile.sggcc
+  Bumped dll-number from 2 to 3 in makefile.cygwin
+  Revised contrib/gregbook/rpng*-x.c to avoid a memory leak and to exit cleanly
+     if user attempts to run it on an 8-bit display.
+  Updated contrib/gregbook
+  Use png_malloc instead of png_zalloc to allocate palette in pngset.c
+  Updated makefile.ibmc
+  Added some typecasts to eliminate gcc 3.0 warnings.  Changed prototypes
+     of png_write_oFFS width and height from png_uint_32 to png_int_32.
+  Updated example.c
+  Revised prototypes for png_debug_malloc and png_debug_free in pngtest.c
+version 1.2.0beta5 [August 8, 2001]
+  Revised contrib/gregbook
+  Revised makefile.gcmmx
+  Revised pnggccrd.c to conditionally compile some thread-unsafe code only
+     when PNG_THREAD_UNSAFE_OK is defined.
+  Added tests to prevent pngwutil.c from writing a bKGD or tRNS chunk with
+     value exceeding 2^bit_depth-1
+  Revised makefile.sgi and makefile.sggcc
+  Replaced calls to fprintf(stderr,...) with png_warning() in pnggccrd.c
+  Removed restriction that do_invert_mono only operate on 1-bit opaque files
+version 1.2.0 [September 1, 2001]
+  Changed a png_warning() to png_debug() in pnggccrd.c
+  Fixed contrib/gregbook/rpng-x.c, rpng2-x.c to avoid crash with XFreeGC().
+version 1.2.1beta1 [October 19, 2001]
+  Revised makefile.std in contrib/pngminus
+  Include background_1 in png_struct regardless of gamma support.
+  Revised makefile.netbsd and makefile.macosx, added makefile.darwin.
+  Revised example.c to provide more details about using row_callback().
+version 1.2.1beta2 [October 25, 2001]
+  Added type cast to each NULL appearing in a function call, except for
+    WINCE functions.
+  Added makefile.so9.
+version 1.2.1beta3 [October 27, 2001]
+  Removed type casts from all NULLs.
+  Simplified png_create_struct_2().
+version 1.2.1beta4 [November 7, 2001]
+  Revised png_create_info_struct() and png_creat_struct_2().
+  Added error message if png_write_info() was omitted.
+  Type cast NULLs appearing in function calls when _NO_PROTO or
+    PNG_TYPECAST_NULL is defined.
+version 1.2.1rc1 [November 24, 2001]
+  Type cast NULLs appearing in function calls except when PNG_NO_TYPECAST_NULL
+    is defined.
+  Changed typecast of "size" argument to png_size_t in pngmem.c calls to
+    the user malloc_fn, to agree with the prototype in png.h
+  Added a pop/push operation to pnggccrd.c, to preserve Eflag (Maxim Sobolev)
+  Updated makefile.sgi to recognize LIBPATH and INCPATH.
+  Updated various makefiles so "make clean" does not remove previous major
+    version of the shared library.
+version 1.2.1rc2 [December 4, 2001]
+  Always allocate 256-entry internal palette, hist, and trans arrays, to
+    avoid out-of-bounds memory reference caused by invalid PNG datastreams.
+  Added a check for prefix_length > data_length in iCCP chunk handler.
+version 1.2.1 [December 7, 2001]
+  None.
+version 1.2.2beta1 [February 22, 2002]
+  Fixed a bug with reading the length of iCCP profiles (Larry Reeves).
+  Revised makefile.linux, makefile.gcmmx, and makefile.sgi to generate
+    libpng.a, libpng12.so (not libpng.so.3), and libpng12/png.h
+  Revised makefile.darwin to remove "-undefined suppress" option.
+  Added checks for gamma and chromaticity values over 21474.83, which exceed
+    the limit for PNG unsigned 32-bit integers when encoded.
+  Revised calls to png_create_read_struct() and png_create_write_struct()
+    for simpler debugging.
+  Revised png_zalloc() so zlib handles errors (uses PNG_FLAG_MALLOC_NULL_MEM_OK)
+version 1.2.2beta2 [February 23, 2002]
+  Check chunk_length and idat_size for invalid (over PNG_MAX_UINT) lengths.
+  Check for invalid image dimensions in png_get_IHDR.
+  Added missing "fi;" in the install target of the SGI makefiles.
+  Added install-static to all makefiles that make shared libraries.
+  Always do gamma compensation when image is partially transparent.
+version 1.2.2beta3 [March 7, 2002]
+  Compute background.gray and background_1.gray even when color_type is RGB
+    in case image gets reduced to gray later.
+  Modified shared-library makefiles to install pkgconfig/libpngNN.pc.
+  Export (with PNGAPI) png_zalloc, png_zfree, and png_handle_as_unknown
+  Removed unused png_write_destroy_info prototype from png.h
+  Eliminated incorrect use of width_mmx from pnggccrd.c in pixel_bytes == 8 case
+  Added install-shared target to all makefiles that make shared libraries.
+  Stopped a double free of palette, hist, and trans when not using free_me.
+  Added makefile.32sunu for Sun Ultra 32 and makefile.64sunu for Sun Ultra 64.
+version 1.2.2beta4 [March 8, 2002]
+  Compute background.gray and background_1.gray even when color_type is RGB
+    in case image gets reduced to gray later (Jason Summers).
+  Relocated a misplaced /bin/rm in the "install-shared" makefile targets
+  Added PNG_1_0_X macro which can be used to build a 1.0.x-compatible library.
+version 1.2.2beta5 [March 26, 2002]
+  Added missing PNGAPI to several function definitions.
+  Check for invalid bit_depth or color_type in png_get_IHDR(), and
+    check for missing PLTE or IHDR in png_push_read_chunk() (Matthias Clasen).
+  Revised iTXt support to accept NULL for lang and lang_key.
+  Compute gamma for color components of background even when color_type is gray.
+  Changed "()" to "{}" in scripts/libpng.pc.in.
+  Revised makefiles to put png.h and pngconf.h only in $prefix/include/libpngNN
+  Revised makefiles to make symlink to libpng.so.NN in addition to libpngNN.so
+version 1.2.2beta6 [March 31, 2002]
+version 1.0.13beta1 [March 31, 2002]
+  Prevent png_zalloc() from trying to memset memory that it failed to acquire.
+  Add typecasts of PNG_MAX_UINT in pngset_cHRM_fixed() (Matt Holgate).
+  Ensure that the right function (user or default) is used to free the
+    png_struct after an error in png_create_read_struct_2().
+version 1.2.2rc1 [April 7, 2002]
+version 1.0.13rc1 [April 7, 2002]
+  Save the ebx register in pnggccrd.c (Sami Farin)
+  Add "mem_ptr = png_ptr->mem_ptr" in png_destroy_write_struct() (Paul Gardner).
+  Updated makefiles to put headers in include/libpng and remove old include/*.h.
+version 1.2.2 [April 15, 2002]
+version 1.0.13 [April 15, 2002]
+  Revised description of png_set_filter() in libpng.3/libpng.txt.
+  Revised makefile.netbsd and added makefile.neNNbsd and makefile.freebsd
+version 1.0.13patch01 [April 17, 2002]
+version 1.2.2patch01 [April 17, 2002]
+  Changed ${PNGMAJ}.${PNGVER} bug to ${PNGVER} in makefile.sgi and makefile.sggcc
+  Fixed VER -> PNGVER typo in makefile.macosx and added install-static to install
+  Added install: target to makefile.32sunu and makefile.64sunu
+version 1.0.13patch03 [April 18, 2002]
+version 1.2.2patch03 [April 18, 2002]
+  Revised 15 makefiles to link libpng.a to libpngNN.a and the include libpng
+  subdirectory to libpngNN subdirectory without the full pathname.
+  Moved generation of libpng.pc from "install" to "all" in 15 makefiles.
+version 1.2.3rc1 [April 28, 2002]
+  Added install-man target to 15 makefiles (Dimitri Papadopolous-Orfanos).
+  Added $(DESTDIR) feature to 24 makefiles (Tim Mooney)
+  Fixed bug with $prefix, should be $(prefix) in makefile.hpux.
+  Updated cygwin-specific portion of pngconf.h and revised makefile.cygwin
+  Added a link from libpngNN.pc to libpng.pc in 15 makefiles.
+  Added links from include/libpngNN/*.h to include/*.h in 24 makefiles.
+  Revised makefile.darwin to make relative links without full pathname.
+  Added setjmp() at the end of png_create_*_struct_2() in case user forgets
+    to put one in their application.
+  Restored png_zalloc() and png_zfree() prototypes to version 1.2.1 and
+    removed them from module definition files.
+version 1.2.3rc2 [May 1, 2002]
+  Fixed bug in reporting number of channels in pngget.c and pngset.c,
+    that was introduced in version 1.2.2beta5.
+  Exported png_zalloc(), png_zfree(), png_default_read(), png_default_write(),
+    png_default_flush(), and png_push_fill_buffer() and included them in
+    module definition files.
+  Added "libpng.pc" dependency to the "install-shared" target in 15 makefiles.
+version 1.2.3rc3 [May 1, 2002]
+  Revised prototype for png_default_flush()
+  Remove old libpng.pc and libpngNN.pc before installing new ones.
+version 1.2.3rc4 [May 2, 2002]
+  Typos in *.def files (png_default_read|write -> png_default_read|write_data)
+  In makefiles, changed rm libpng.NN.pc to rm libpngNN.pc
+  Added libpng-config and libpngNN-config and modified makefiles to install them.
+  Changed $(MANPATH) to $(DESTDIR)$(MANPATH) in makefiles
+  Added "Win32 DLL VB" configuration to projects/msvc/libpng.dsp
+version 1.2.3rc5 [May 11, 2002]
+  Changed "error" and "message" in prototypes to "error_message" and
+    "warning_message" to avoid namespace conflict.
+  Revised 15 makefiles to build libpng-config from libpng-config-*.in
+  Once more restored png_zalloc and png_zfree to regular nonexported form.
+  Restored png_default_read|write_data, png_default_flush, png_read_fill_buffer
+    to nonexported form, but with PNGAPI, and removed them from module def files.
+version 1.2.3rc6 [May 14, 2002]
+  Removed "PNGAPI" from png_zalloc() and png_zfree() in png.c
+  Changed "Gz" to "Gd" in projects/msvc/libpng.dsp and zlib.dsp.
+  Removed leftover libpng-config "sed" script from four makefiles.
+  Revised libpng-config creating script in 16 makefiles.
+version 1.2.3 [May 22, 2002]
+  Revised libpng-config target in makefile.cygwin.
+  Removed description of png_set_mem_fn() from documentation.
+  Revised makefile.freebsd.
+  Minor cosmetic changes to 15 makefiles, e.g., $(DI) = $(DESTDIR)/$(INCDIR).
+  Revised projects/msvc/README.txt
+  Changed -lpng to -lpngNN in LDFLAGS in several makefiles.
+version 1.2.4beta1 [May 24, 2002]
+  Added libpng.pc and libpng-config to "all:" target in 16 makefiles.
+  Fixed bug in 16 makefiles: $(DESTDIR)/$(LIBPATH) to $(DESTDIR)$(LIBPATH)
+  Added missing "\" before closing double quote in makefile.gcmmx.
+  Plugged various memory leaks; added png_malloc_warn() and png_set_text_2()
+    functions.
+version 1.2.4beta2 [June 25, 2002]
+  Plugged memory leak of png_ptr->current_text (Matt Holgate).
+  Check for buffer overflow before reading CRC in pngpread.c (Warwick Allison)
+  Added -soname to the loader flags in makefile.dec, makefile.sgi, and
+    makefile.sggcc.
+  Added "test-installed" target to makefile.linux, makefile.gcmmx,
+    makefile.sgi, and makefile.sggcc.
+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.solaris, makefile.hpux, makefile.hpgcc, and makefile.so9.
+version 1.2.4rc1 [July 2, 2002]
+  Added "test-installed" target to makefile.cygwin and makefile.sco.
+  Revised pnggccrd.c to be able to back out version 1.0.x via PNG_1_0_X macro.
+version 1.2.4 [July 8, 2002]
+  Changed png_warning() to png_error() when width is too large to process.
+
+Send comments/corrections/commendations to
+png-implement@ccrc.wustl.edu or to randeg@alum.rpi.edu
+
+Glenn R-P

src/png/INSTALL

@@ -1,5 +1,5 @@
 
-Installing libpng version 1.0.1 March 15, 1998
+Installing libpng version 1.2.4 - July 8, 2002
 
 Before installing libpng, you must first install zlib.  zlib
 can usually be found wherever you got libpng.  zlib can be
@@ -10,8 +10,8 @@ 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-1.0.1 or "lpng100" and "zlib-1.1.1"
+might be called "libpng-1.2.4" or "lpng109" and "zlib-1.1.4"
-or "zlib111") so that you have directories called "zlib" and "libpng".
+or "zlib114") so that you have directories called "zlib" and "libpng".
 
 Your directory structure should look like this:
 
@@ -21,8 +21,24 @@ Your directory structure should look like this:
           README
           *.h
           *.c
+          contrib
+             gregbook
+             msvctest
+             pngminus
+             pngsuite
+             visupng
+          projects
+             beos
+             borland
+             msvc
+             netware.txt
+             wince.txt
           scripts
              makefile.*
+             libpng*.in
+          mangle
+             makefile.*
+             mangle.in
           pngtest.png
           etc.
       zlib
@@ -32,40 +48,84 @@ Your directory structure should look like this:
           contrib
           etc.
 
-First enter the zlib directory and follow the instructions
+If the line endings in the files look funny, you may wish to get the other
-in zlib/README.  Then come back here and choose the
+distribution of libpng.  It is available in both tar.gz (UNIX style line
-appropriate makefile.sys in the scripts directory.
+endings) and zip (DOS style line endings) formats.
+
+If you are building libpng with MSVC, you can enter the libpng\msvc directory
+and follow the instructions in msvc\README.txt.
+
+You can build libpng for WindowsCE by entering the downloading and installing
+the libpng\wince directory as instructed in the projects\wince.txt file, and
+then following the instructions in the README* files.  Similarly, you can
+build libpng for Netware as instructed in projects\netware.txt.
+
+Else enter the zlib directory and follow the instructions in zlib/README,
+then come back here and choose the appropriate makefile.sys in the scripts
+directory.
+
 The files that are presently available in the scripts directory
 include
 
-      descrip.mms   =>  VMS makefile for MMS or MMK
+ makefile.std      =>  Generic UNIX makefile (cc, creates static libpng.a)
-      makefile.std  =>  Generic UNIX makefile
+ makefile.linux    =>  Linux/ELF makefile (gcc, creates libpng12.so.0.1.2.4)
-      makefile.knr  =>  Archaic UNIX Makefile that converts files with ansi2knr
+ makefile.gcmmx    =>  Linux/ELF makefile (gcc, creates libpng12.so.0.1.2.4,
+                       uses assembler code tuned for Intel MMX platform)
+ makefile.gcc      =>  Generic makefile (gcc, creates static libpng.a)
+ makefile.knr      =>  Archaic UNIX Makefile that converts files with
+                       ansi2knr (Requires ansi2knr.c from
+                       ftp://ftp.cs.wisc.edu/ghost)
+ makefile.aix      =>  AIX makefile
+ makefile.cygwin   =>  Cygwin/gcc makefile
+ makefile.darwin   =>  Darwin makefile
  makefile.dec      =>  DEC Alpha UNIX makefile
-      makefile.sgi  =>  Silicon Graphics IRIX makefile
+ makefile.hpgcc    =>  FreeBSD makefile
-      makefile.sun  =>  Sun makefile
+ makefile.hpgcc    =>  HPUX makefile using gcc
-      makefile.s2x  =>  Solaris 2.X makefile (gcc, creates libpng.so.2.1.0)
+ makefile.hpux     =>  HPUX (10.20 and 11.00) makefile
-      makefile.lnx  =>  Linux/ELF makefile (gcc, creates libpng.so.2.1.0)
+ makefile.ibmc     =>  IBM C/C++ version 3.x for Win32 and OS/2 (static)
-      makefile.mip  =>  MIPS makefile
+ makefile.intel    =>  Intel C/C++ version 4.0 and later
-      makefile.aco  =>  Acorn makefile
+ libpng.icc        =>  Project file for IBM VisualAge/C++ version 4.0 or later
-      makefile.ama  =>  Amiga makefile
+ makefile.macosx   =>  MACOS X Makefile
+ makefile.netbsd   =>  NetBSD/cc makefile, uses PNGGCCRD, makes libpng.so.
+ makefile.ne0bsd  =>  NetBSD/cc makefile, uses PNGGCCRD, makes libpng0.so
+ makefile.openbsd  =>  OpenBSD makefile
+ makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
+ makefile.sggcc    =>  Silicon Graphics (gcc, creates libpng12.so.0.1.2.4)
+ makefile.sunos    =>  Sun makefile
+ makefile.solaris  =>  Solaris 2.X makefile (gcc, creates libpng12.so.0.1.2.4)
+ makefile.so9      =>  Solaris 9 makefile (gcc, creates libpng12.so.0.1.2.4)
+ 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
+ makefile.mips     =>  MIPS makefile
+ makefile.acorn    =>  Acorn makefile
+ makefile.amiga    =>  Amiga makefile
  smakefile.ppc     =>  AMIGA smakefile for SAS C V6.58/7.00 PPC compiler
                        (Requires SCOPTIONS, copied from scripts/SCOPTIONS.ppc)
-      makefile.atr  =>  Atari makefile
+ makefile.atari    =>  Atari makefile
-      makefile.bor  =>  Borland makefile
+ makefile.beos     =>  BEOS makefile for X86
-      build.bat     =>  MS-DOS batch file for Borland compiler
+ makefile.bor      =>  Borland makefile (uses bcc)
+ makefile.bc32     =>  32-bit Borland C++ (all modules compiled in C mode)
+ makefile.bd32     =>  To make a png32bd.dll with Borland C++ 4.5
+ makefile.tc3      =>  Turbo C 3.0 makefile
  makefile.dj2      =>  DJGPP 2 makefile
  makefile.msc      =>  Microsoft C makefile
-      makefile.tc3  =>  Turbo C 3.0 makefile
+ makefile.vcawin32 =>  makefile for Microsoft Visual C++ 5.0 and later (uses
+                       assembler code tuned for Intel MMX platform)
+ makefile.vcwin32  =>  makefile for Microsoft Visual C++ 4.0 and later (does
+                       not use assembler code)
  makefile.os2      =>  OS/2 Makefile (gcc and emx, requires pngos2.def)
  pngos2.def        =>  OS/2 module definition file used by makefile.os2
-      makefile.wat  =>  Watcom 10a+ Makefile, 32-bit flat memory model
+ makefile.watcom   =>  Watcom 10a+ Makefile, 32-bit flat memory model
  makevms.com       =>  VMS build script
+ descrip.mms       =>  VMS makefile for MMS or MMK
+ pngdef.pas        =>  Defines for a png32bd.dll with Borland C++ 4.5
+ SCOPTIONS.ppc     =>  Used with smakefile.ppc
 
 Copy the file (or files) that you need from the
 scripts directory into this directory, for example
 
-   MSDOS example: copy scripts\makefile.msd makefile
+   MSDOS example: copy scripts\makefile.msc makefile
    UNIX example:    cp scripts/makefile.std makefile
 
 Read the makefile to see if you need to change any source or
@@ -77,11 +137,34 @@ changes.
 Then just run "make test" which will create the libpng library in
 this directory and run a quick test that reads the "pngtest.png"
 file and writes a "pngout.png" file that should be identical to it.
+Look for "9782 zero samples" in the output of the test.  For more
+confidence, you can run another test by typing "pngtest pngnow.png"
+and looking for "289 zero samples" in the output.  Also, you can
+run "pngtest -m *.png" in the "contrib/pngsuite" directory and compare
+your output with the result shown in contrib/pngsuite/README.
 
 Most of the makefiles will allow you to run "make install" to
 put the library in its final resting place (if you want to
 do that, run "make install" in the zlib directory first if necessary).
+Some also allow you to run "make test-installed" after you have
+run "make install".  This will build and run executables called "pngtesti"
+and "mangle/pngtestm".
+
+The files that are presently available in the mangle directory include the
+following.  The makefiles are automatically run by the corresponding makefiles
+in the scripts directory when you run "make", "make install", or
+"make test-installed".
+
+ mangle.in        =>  Function-decoration macros added to png.h by the
+                      makefiles.
+ makefile.linux   =>  Linux/ELF makefile
+                      (gcc, creates libpng12m.so.0.1.2.4)
+ makefile.gcmmx   =>  Linux/ELF makefile (gcc, creates
+                      libpng12.so.0m.1.2.4, uses assembler code
+                      tuned for Intel MMX platform)
+ makefile.sgi     =>  Silicon Graphics (cc, creates libpng12m.so)
+ makefile.sggcc   =>  Silicon Graphics (gcc, creates libpng12m.so)
 
 Further information can be found in the README and libpng.txt
-files, in the individual makefiles, and in png.h, and the manual
+files, in the individual makefiles, in png.h, in the README files in
-pages libpng.3 and png.5.
+subdirectories of the LIB directory, and the manual pages libpng.3 and png.5.

src/png/README

@@ -1,14 +1,19 @@
-README for libpng 1.0.1 (shared library 2.1)
+README for libpng 1.2.4 - July 8, 2002 (shared library 12.0)
 See the note about version numbers near the top of png.h
 
 See INSTALL for instructions on how to install libpng.
 
-This is the first official release of libpng.  Don't let the fact that
+Libpng comes in two distribution formats.  Get libpng-*.tar.gz if you
-it's the first release fool you.  The libpng library has been in
+want UNIX-style line endings in the text files, or lpng*.zip if you want
-extensive use and testing for about two and a half years.  However, it's
+DOS-style line endings.
-finally gotten to the stage where there haven't been significant
+
+Version 0.89 was the first official release of libpng.  Don't let the
+fact that it's the first release fool you.  The libpng library has been in
+extensive use and testing since mid-1995.  By late 1997 it had
+finally gotten to the stage where there hadn't been significant
 changes to the API in some time, and people have a bad feeling about
-libraries with versions < 1.0.
+libraries with versions < 1.0.  Version 1.0.0 was released in
+March 1998.
 
 ****
 Note that some of the changes to the png_info structure render this
@@ -28,8 +33,8 @@ directly, to avoid such problems in the future.
 It is important to note that the APIs do not make current programs
 that access the info struct directly incompatible with the new
 library.  However, it is strongly suggested that new programs use
-the new APIs (as shown in example.c), and older programs be converted
+the new APIs (as shown in example.c and pngtest.c), and older programs
-to the new format, to facilitate upgrades in the future.
+be converted to the new format, to facilitate upgrades in the future.
 ****
 
 Additions since 0.90 include the ability to compile libpng as a
@@ -49,8 +54,9 @@ to set different actions based on whether the CRC error occurred in a
 critical or an ancillary chunk.
 
 The changes made to the library, and bugs fixed are based on discussions
-on the PNG implementation mailing list <png-implement@dworking.wustl.edu>
+on the PNG implementation mailing list <png-implement@ccrc.wustl.edu>
-and not on material submitted to Guy.
+and not on material submitted privately to Guy, Andreas, or Glenn.  They will
+forward any good suggestions to the list.
 
 For a detailed description on using libpng, read libpng.txt.  For
 examples of libpng in a program, see example.c and pngtest.c.  For usage
@@ -98,8 +104,8 @@ fix.  Please mention "libpng" somewhere in the subject line.  Thanks.
 This release was created and will be supported by myself (of course
 based in a large way on Guy's and Andreas' earlier work), and the PNG group.
 
-randeg@alumni.rpi.edu
+randeg@alum.rpi.edu
-png-implement@dworkin.wustl.edu
+png-implement@ccrc.wustl.edu
 
 You can't reach Guy, the original libpng author, at the addresses
 given in previous versions of this document.  He and Andreas will read mail
@@ -108,7 +114,7 @@ addressed to the png-implement list, however.
 Please do not send general questions about PNG.  Send them to
 the address in the specification (png-group@w3.org).  At the same
 time, please do not send libpng questions to that address, send them to me
-or to png-implement@dworkin.wustl.edu.  I'll
+or to png-implement@ccrc.wustl.edu.  I'll
 get them in the end anyway.  If you have a question about something
 in the PNG specification that is related to using libpng, send it
 to me.  Send me any questions that start with "I was using libpng,
@@ -123,24 +129,27 @@ gladly listen.  Even if your suggestion is not used for version
 
 Files in this distribution:
 
+      ANNOUNCE      =>  Announcement of this version, with recent changes
       CHANGES       =>  Description of changes between libpng versions
+      KNOWNBUG      =>  List of known bugs and deficiencies
+      LICENSE       =>  License to use and redistribute libpng
       README        =>  This file
       TODO          =>  Things not implemented in the current library
-      ansi2knr.1    =>  Manual page for ansi2knr
+      Y2KINFO       =>  Statement of Y2K compliance
-      ansi2knr.c    =>  Converts files to K&R style function declarations
-      build.bat     =>  MS-DOS batch file for Borland compiler
-      descrip.mms   =>  VMS project file
       example.c     =>  Example code for using libpng functions
-      libpng.3      =>  manual page for libpng
+      libpng.3      =>  manual page for libpng (includes libpng.txt)
       libpng.txt    =>  Description of libpng and its functions
       libpngpf.3    =>  manual page for libpng's private functions
       png.5         =>  manual page for the PNG format
       png.c         =>  Basic interface functions common to library
       png.h         =>  Library function and interface declarations
       pngconf.h     =>  System specific library configuration
+      pngasmrd.h    =>  Header file for assembler-coded functions
       pngerror.c    =>  Error/warning message I/O functions
       pngget.c      =>  Functions for retrieving info from struct
       pngmem.c      =>  Memory handling functions
+      pngbar.png    =>  PNG logo, 88x31
+      pngnow.png    =>  PNG logo, 98x31
       pngpread.c    =>  Progressive reading functions
       pngread.c     =>  Read data/helper high-level functions
       pngrio.c      =>  Lowest-level data read I/O functions
@@ -154,36 +163,102 @@ Files in this distribution:
       pngwrite.c    =>  High-level write functions
       pngwtran.c    =>  Write data transformations
       pngwutil.c    =>  Write utility functions
+      contrib       =>  Contributions
+       gregbook         =>  source code for PNG reading and writing, from
+                            Greg Roelofs' "PNG: The Definitive Guide",
+                            O'Reilly, 1999
+       msvctest     =>  Builds and runs pngtest using a MSVC workspace
+       pngminus     =>  Simple pnm2png and png2pnm programs
+       pngsuite     =>  Test images
+       visupng      =>  Contains a MSVC workspace for VisualPng
+      projects      =>  Contains project files and workspaces for building DLL
+       beos             =>  Contains a Beos workspace for building libpng
+       borland          =>  Contains a Borland workspace for building libpng
+                            and zlib
+       msvc             =>  Contains a Microsoft Visual C++ (MSVC) workspace
+                            for building libpng and zlib
+       netware.txt      =>  Contains instructions for downloading a set of
+                            project files for building libpng and zlib on
+                            Netware.
+       wince.txt        =>  Contains instructions for downloading a Microsoft
+                            Visual C++ (Windows CD Toolkit) workspace for
+                            building libpng and zlib on WindowsCE
       scripts       =>  Directory containing scripts for building libpng:
        descrip.mms      =>  VMS makefile for MMS or MMK
-        makefile.std  =>  Generic UNIX makefile
+       makefile.std     =>  Generic UNIX makefile (cc, creates static libpng.a)
-        makefile.knr  =>  Archaic UNIX Makefile that converts files with ansi2knr
+       makefile.linux   =>  Linux/ELF makefile
+                            (gcc, creates libpng12.so.0.1.2.4)
+       makefile.gcmmx   =>  Linux/ELF makefile (gcc, creates
+                            libpng12.so.0.1.2.4, uses assembler code
+                            tuned for Intel MMX platform)
+       makefile.gcc     =>  Generic makefile (gcc, creates static libpng.a)
+       makefile.knr     =>  Archaic UNIX Makefile that converts files with
+                            ansi2knr (Requires ansi2knr.c from
+                            ftp://ftp.cs.wisc.edu/ghost)
+       makefile.aix     =>  AIX makefile
+       makefile.cygwin  =>  Cygwin/gcc makefile
+       makefile.darwin  =>  Darwin makefile
        makefile.dec     =>  DEC Alpha UNIX makefile
-        makefile.sgi  =>  Silicon Graphics IRIX makefile
+       makefile.freebsd =>  FreeBSD makefile
-        makefile.sun  =>  Sun makefile
+       makefile.hpgcc   =>  HPUX makefile using gcc
-        makefile.s2x  =>  Solaris 2.X makefile (gcc, creates libpng.so.2.1.0)
+       makefile.hpux    =>  HPUX (10.20 and 11.00) makefile
-        makefile.lnx  =>  Linux/ELF makefile (gcc, creates libpng.so.2.1.0)
+       makefile.ibmc    =>  IBM C/C++ version 3.x for Win32 and OS/2 (static)
-        makefile.mip  =>  MIPS makefile
+       makefile.intel   =>  Intel C/C++ version 4.0 and later
-        makefile.aco  =>  Acorn makefile
+       libpng.icc       =>  Project file, IBM VisualAge/C++ 4.0 or later
-        makefile.ama  =>  Amiga makefile
+       makefile.macosx  =>  MACOS X Makefile
-        smakefile.ppc =>  AMIGA smakefile for SAS C V6.58/7.00 PPC compiler
+       makefile.netbsd  =>  NetBSD/cc makefile, PNGGCCRD, makes libpng.so.
-                          (Requires SCOPTIONS, copied from scripts/SCOPTIONS.ppc)
+       makefile.ne0bsd =>  NetBSD/cc makefile, PNGGCCRD, makes libpng0.so
-        makefile.atr  =>  Atari makefile
+       makefile.openbsd =>  OpenBSD makefile
-        makefile.bor  =>  Borland makefile
+       makefile.sgi     =>  Silicon Graphics IRIX (cc, creates static lib)
-        build.bat     =>  MS-DOS batch file for Borland compiler
+       makefile.sggcc   =>  Silicon Graphics (gcc, creates libpng12.so.0.1.2.4)
+       makefile.sunos   =>  Sun makefile
+       makefile.solaris =>  Solaris 2.X makefile
+                            (gcc, creates libpng12.so.0.1.2.4)
+       makefile.so9     =>  Solaris 9 makefile
+                            (gcc, creates libpng12.so.0.1.2.4)
+       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
+       makefile.mips    =>  MIPS makefile
+       makefile.acorn   =>  Acorn makefile
+       makefile.amiga   =>  Amiga makefile
+       smakefile.ppc    =>  AMIGA smakefile for SAS C V6.58/7.00 PPC
+                            compiler (Requires SCOPTIONS, copied from
+                            scripts/SCOPTIONS.ppc)
+       makefile.atari   =>  Atari makefile
+       makefile.beos    =>  BEOS makefile for X86
+       makefile.bor     =>  Borland makefile (uses bcc)
+       makefile.bc32    =>  32-bit Borland C++ (all modules compiled in C mode)
+       makefile.bd32    =>  To make a png32bd.dll with Borland C++ 4.5
+       makefile.tc3     =>  Turbo C 3.0 makefile
        makefile.dj2     =>  DJGPP 2 makefile
        makefile.msc     =>  Microsoft C makefile
-        makefile.tc3  =>  Turbo C 3.0 makefile
+       makefile.vcawin32 => makefile for Microsoft Visual C++ 5.0 and
+                            later (uses assembler code tuned for Intel MMX
+                            platform)
+       makefile.vcwin32 =>  makefile for Microsoft Visual C++ 4.0 and
+                            later (does not use assembler code)
        makefile.os2     =>  OS/2 Makefile (gcc and emx, requires pngos2.def)
-        makefile.wat  =>  Watcom 10a+ Makefile, 32-bit flat memory model
        pngos2.def       =>  OS/2 module definition file used by makefile.os2
+       makefile.watcom  =>  Watcom 10a+ Makefile, 32-bit flat memory model
        makevms.com      =>  VMS build script
+       pngdef.pas       =>  Defines for a png32bd.dll with Borland C++ 4.5
+       SCOPTIONS.ppc    =>  Used with smakefile.ppc
+      mangle        =>  Directory containing scripts to build libpng12m.so:
+       mangle.in        =>  Function-decoration macros added to png.h by the
+                            makefiles.
+       makefile.linux   =>  Linux/ELF makefile
+                            (gcc, creates libpng12m.so.0.1.2.4)
+       makefile.gcmmx   =>  Linux/ELF makefile (gcc, creates
+                            libpng12.so.0m.1.2.4, uses assembler code
+                            tuned for Intel MMX platform)
+       makefile.sgi     =>  Silicon Graphics (cc, creates libpng12m.so)
+       makefile.sggcc   =>  Silicon Graphics (gcc, creates libpng12m.so)
 
 Good luck, and happy coding.
 
 -Glenn Randers-Pehrson
- Internet: randeg@alumni.rpi.edu
+ Internet: randeg@alum.rpi.edu
- Web: http://www.rpi.edu/~randeg/index.html
 
 -Andreas Eric Dilger
  Internet: adilger@enel.ucalgary.ca

src/png/TODO

@@ -1,22 +1,24 @@
-TODO - list of things to do for libpng
+TODO - list of things to do for libpng:
 
-fix problem with C++ and EXTERN "C"
+Final bug fixes.
-add "grayscale->palette" transformation and "palette->grayscale" detection
+Improve API by hiding the png_struct and png_info structs.
-add "grayscale" -> "grayscale+alpha" and "grayscale+FILLER" transformations
+Finish work on the no-floating-point version (including gamma compensation)
-improved dithering
+Better C++ wrapper/full C++ implementation?
-multi-lingual error and warning message support
+Fix problem with C++ and EXTERN "C".
-sPLT chunk handling
+cHRM transformation.
-cHRM transformation
+Improve setjmp/longjmp usage or remove it in favor of returning error codes.
-complete sRGB transformation (presently it simply uses gamma=0.45)
+Add "grayscale->palette" transformation and "palette->grayscale" detection.
-man pages for function calls
+Improved dithering.
-high-level API for reading images
+Multi-lingual error and warning message support.
-final bug fixes
+Complete sRGB transformation (presently it simply uses gamma=0.45455).
-better documentation
+Man pages for function calls.
-better filter selection
+Better documentation.
-   (counting huffman bits/precompression?  filter inertia?  filter costs?)
+Better filter selection
-optional palette creation
+   (counting huffman bits/precompression?  filter inertia?  filter costs?).
-histogram creation
+Histogram creation.
-support for application-defined chunk handlers
+Text conversion between different code pages (Latin-1 -> Mac and DOS).
-keep up with public chunks
+Should we always malloc 2^bit_depth PLTE/tRNS/hIST entries for safety?
-better C++ wrapper/full C++ implementation?
+Build gamma tables using fixed point (and do away with floating point entirely).
-text conversion between different code pages (Latin-1 -> Mac and DOS)
+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.

src/png/Y2KINFO

@@ -1,14 +1,14 @@
    Y2K compliance in libpng:
    =========================
 
-      January 13, 1999
+      July 8, 2002
 
       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 0.81 and
+      This is your unofficial assurance that libpng from version 0.71 and
-      upward are Y2K compliant.  It is my belief that earlier versions were
+      upward through 1.2.4 are Y2K compliant.  It is my belief that earlier
-      also Y2K compliant.
+      versions were also Y2K compliant.
 
       Libpng only has three year fields.  One is a 2-byte unsigned integer
       that will hold years up to 65535.  The other two hold the date in text
@@ -37,15 +37,18 @@
       clock time, which returns (year - 1900), which we properly convert to
       the full 4-digit year.  There is a possibility that applications using
       libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
-      function, or incorrectly passing only a 2-digit year instead of
+      function, or that they are incorrectly passing only a 2-digit year
-      "year - 1900" into the png_convert_from_struct_tm() function, but this
+      instead of "year - 1900" into the png_convert_from_struct_tm() function,
-      is not under our control.  The libpng documentation has always stated
+      but this is not under our control.  The libpng documentation has always
-      that it works with 4-digit years, and the APIs have been documented as
+      stated that it works with 4-digit years, and the APIs have been
-      such.
+      documented as such.
 
       The tIME chunk itself is also Y2K compliant.  It uses a 2-byte unsigned
       integer to hold the year, and can hold years as large as 65535.
 
+      zlib, upon which libpng depends, is also Y2K compliant.  It contains
+      no date-related code.
+
 
          Glenn Randers-Pehrson
          libpng maintainer

src/png/example.c

@@ -1,22 +1,38 @@
 
+#if 0 /* in case someone actually tries to compile this */
+
 /* example.c - an example of using libpng */
 
 /* This is an example of how to use libpng to read and write PNG files.
  * The file libpng.txt is much more verbose then this.  If you have not
  * read it, do so first.  This was designed to be a starting point of an
- * implementation.  This is not officially part of libpng, and therefore
+ * implementation.  This is not officially part of libpng, is hereby placed
- * does not require a copyright notice.
+ * in the public domain, and therefore does not require a copyright notice.
  *
  * This file does not currently compile, because it is missing certain
  * parts, like allocating memory to hold an image.  You will have to
  * supply these parts to get it to compile.  For an example of a minimal
- * working PNG reader/writer, see pngtest.c, included in this distribution.
+ * working PNG reader/writer, see pngtest.c, included in this distribution;
+ * see also the programs in the contrib directory.
  */
 
 #include "png.h"
 
-/* Check to see if a file is a PNG file using png_sig_cmp().  Returns
+ /* The png_jmpbuf() macro, used in error handling, became available in
- * non-zero if the image is a PNG, and 0 if it isn't a PNG.
+  * libpng version 1.0.6.  If you want to be able to run your code with older
+  * versions of libpng, you must define the macro yourself (but only if it
+  * is not already defined by libpng!).
+  */
+
+#ifndef png_jmpbuf
+#  define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
+#endif
+
+/* Check to see if a file is a PNG file using png_sig_cmp().  png_sig_cmp()
+ * returns zero if the image is a PNG and nonzero if it isn't a PNG.
+ *
+ * The function check_if_png() shown here, but not used, returns nonzero (true)
+ * if the file can be opened and is a PNG, 0 (false) otherwise.
  *
  * If this call is successful, and you are going to keep the file open,
  * you should call png_set_sig_bytes(png_ptr, PNG_BYTES_TO_CHECK); once
@@ -38,15 +54,17 @@ int check_if_png(char *file_name, FILE **fp)
    char buf[PNG_BYTES_TO_CHECK];
 
    /* Open the prospective PNG file. */
-   if ((*fp = fopen(file_name, "rb")) != NULL);
+   if ((*fp = fopen(file_name, "rb")) == NULL)
       return 0;
 
-   /* Read in the signature bytes */
+   /* Read in some of the signature bytes */
    if (fread(buf, 1, PNG_BYTES_TO_CHECK, *fp) != PNG_BYTES_TO_CHECK)
       return 0;
 
-   /* Compare the first PNG_BYTES_TO_CHECK bytes of the signature. */
+   /* Compare the first PNG_BYTES_TO_CHECK bytes of the signature.
-   return(png_sig_cmp(buf, (png_size_t)0, PNG_BYTES_TO_CHECK));
+      Return nonzero (true) if they match */
+
+   return(!png_sig_cmp(buf, (png_size_t)0, PNG_BYTES_TO_CHECK));
 }
 
 /* Read a PNG file.  You may want to return an error code if the read
@@ -66,7 +84,7 @@ void read_png(char *file_name)  /* We need to open the file */
    FILE *fp;
 
    if ((fp = fopen(file_name, "rb")) == NULL)
-      return;
+      return (ERROR);
 #else no_open_file /* prototype 2 */
 void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
 {
@@ -83,12 +101,12 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
     * was compiled with a compatible version of the library.  REQUIRED
     */
    png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,
-      (void *)user_error_ptr, user_error_fn, user_warning_fn);
+      png_voidp user_error_ptr, user_error_fn, user_warning_fn);
 
    if (png_ptr == NULL)
    {
       fclose(fp);
-      return;
+      return (ERROR);
    }
 
    /* Allocate/initialize the memory for image information.  REQUIRED. */
@@ -96,21 +114,22 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
    if (info_ptr == NULL)
    {
       fclose(fp);
-      png_destroy_read_struct(&png_ptr, (png_infopp)NULL, (png_infopp)NULL);
+      png_destroy_read_struct(&png_ptr, png_infopp_NULL, png_infopp_NULL);
-      return;
+      return (ERROR);
    }
 
    /* Set error handling if you are using the setjmp/longjmp method (this is
     * the normal method of doing things with libpng).  REQUIRED unless you
     * set up your own error handlers in the png_create_read_struct() earlier.
     */
-   if (setjmp(png_ptr->jmpbuf))
+
+   if (setjmp(png_jmpbuf(png_ptr)))
    {
       /* Free all of the memory associated with the png_ptr and info_ptr */
-      png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
+      png_destroy_read_struct(&png_ptr, &info_ptr, png_infopp_NULL);
       fclose(fp);
       /* If we get here, we had a problem reading the file */
-      return;
+      return (ERROR);
    }
 
    /* One of the following I/O initialization methods is REQUIRED */
@@ -129,24 +148,37 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
    /* If we have already read some of the signature */
    png_set_sig_bytes(png_ptr, sig_read);
 
+#ifdef hilevel
+   /*
+    * If you have enough memory to read in the entire image at once,
+    * and you need to specify only transforms that can be controlled
+    * with one of the PNG_TRANSFORM_* bits (this presently excludes
+    * dithering, filling, setting background, and doing gamma
+    * adjustment), then you can read the entire image (including
+    * pixels) into the info structure with this call:
+    */
+   png_read_png(png_ptr, info_ptr, png_transforms, png_voidp_NULL);
+#else
+   /* OK, you're doing it the hard way, with the lower-level functions */
+
    /* The call to png_read_info() gives us all of the information from the
     * PNG file before the first IDAT (image data chunk).  REQUIRED
     */
    png_read_info(png_ptr, info_ptr);
 
    png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
-       &interlace_type, NULL, NULL);
+       &interlace_type, int_p_NULL, int_p_NULL);
 
-/**** Set up the data transformations you want.  Note that these are all
+/* Set up the data transformations you want.  Note that these are all
- **** optional.  Only call them if you want/need them.  Many of the
+ * optional.  Only call them if you want/need them.  Many of the
- **** transformations only work on specific types of images, and many
+ * transformations only work on specific types of images, and many
- **** are mutually exclusive.
+ * are mutually exclusive.
- ****/
+ */
 
    /* 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 th
+   /* Strip alpha bytes from the input data without combining with the
     * background (not recommended).
     */
    png_set_strip_alpha(png_ptr);
@@ -162,17 +194,17 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
 
    /* Expand paletted colors into true RGB triplets */
    if (color_type == PNG_COLOR_TYPE_PALETTE)
-      png_set_expand(png_ptr);
+      png_set_palette_rgb(png_ptr);
 
    /* Expand grayscale images to the full 8 bits from 1, 2, or 4 bits/pixel */
    if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
-      png_set_expand(png_ptr);
+      png_set_gray_1_2_4_to_8(png_ptr);
 
    /* Expand paletted or RGB images with transparency to full alpha channels
     * so the data will be available as RGBA quartets.
     */
    if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
-      png_set_expand(png_ptr);
+      png_set_tRNS_to_alpha(png_ptr);
 
    /* Set the background color to draw transparent and alpha images over.
     * It is possible to set the red, green, and blue components directly
@@ -192,7 +224,8 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
 
    /* Some suggestions as to how to get a screen gamma value */
 
-   /* Note that screen gamma is (display_gamma/viewing_gamma) */
+   /* 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;
@@ -210,7 +243,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
       screen_gamma = 1.7 or 1.0;  /* A good guess for Mac systems */
    }
 
-   /* Tell libpng to handle the gamma conversion for you.  The second call
+   /* Tell libpng to handle the gamma conversion for you.  The final call
     * is a good guess for PC generated images, but it should be configurable
     * by the user at run time by the user.  It is strongly suggested that
     * your application support gamma correction.
@@ -219,19 +252,22 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
    int intent;
 
    if (png_get_sRGB(png_ptr, info_ptr, &intent))
-      png_set_sRGB(png_ptr, intent, 0);
+      png_set_gamma(png_ptr, screen_gamma, 0.45455);
    else
+   {
+      double image_gamma;
       if (png_get_gAMA(png_ptr, info_ptr, &image_gamma))
          png_set_gamma(png_ptr, screen_gamma, image_gamma);
       else
-         png_set_gamma(png_ptr, screen_gamma, 0.50);
+         png_set_gamma(png_ptr, screen_gamma, 0.45455);
+   }
 
    /* Dither RGB files down to 8 bit palette or reduce palettes
     * to the number of colors available on your screen.
     */
    if (color_type & PNG_COLOR_MASK_COLOR)
    {
-      png_uint_32 num_palette;
+      int num_palette;
       png_colorp palette;
 
       /* This reduces the image to the application supplied palette */
@@ -241,12 +277,12 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
          png_color std_color_cube[MAX_SCREEN_COLORS];
 
          png_set_dither(png_ptr, std_color_cube, MAX_SCREEN_COLORS,
-            MAX_SCREEN_COLORS, NULL, 0);
+            MAX_SCREEN_COLORS, png_uint_16p_NULL, 0);
       }
       /* This reduces the image to the palette supplied in the file */
       else if (png_get_PLTE(png_ptr, info_ptr, &palette, &num_palette))
       {
-         png_color16p histogram;
+         png_uint_16p histogram;
 
          png_get_hIST(png_ptr, info_ptr, &histogram);
 
@@ -255,7 +291,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
       }
    }
 
-   /* invert monocrome files to have 0 as white and 1 as black */
+   /* invert monochrome files to have 0 as white and 1 as black */
    png_set_invert_mono(png_ptr);
 
    /* If you want to shift the pixel values from the range [0,255] or
@@ -264,13 +300,14 @@ 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_color8p sig_bit;
+      png_color_8p sig_bit;
 
       png_get_sBIT(png_ptr, info_ptr, &sig_bit);
       png_set_shift(png_ptr, sig_bit);
    }
 
    /* 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) */
@@ -301,7 +338,8 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
 
    for (row = 0; row < height; row++)
    {
-      row_pointers[row] = malloc(png_get_rowbytes(png_ptr, info_ptr));
+      row_pointers[row] = png_malloc(png_ptr, png_get_rowbytes(png_ptr,
+         info_ptr));
    }
 
    /* Now it's time to read the image.  One of these methods is REQUIRED */
@@ -316,18 +354,18 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
 #ifdef single /* Read the image a single row at a time */
       for (y = 0; y < height; y++)
       {
-         png_bytep row_pointers = row[y];
+         png_read_rows(png_ptr, &row_pointers[y], png_bytepp_NULL, 1);
-         png_read_rows(png_ptr, &row_pointers, NULL, 1);
       }
 
 #else no_single /* Read the image several rows at a time */
       for (y = 0; y < height; y += number_of_rows)
       {
 #ifdef sparkle /* Read the image using the "sparkle" effect. */
-         png_read_rows(png_ptr, row_pointers, NULL, number_of_rows);
+         png_read_rows(png_ptr, &row_pointers[y], png_bytepp_NULL,
-        
+            number_of_rows);
 #else no_sparkle /* Read the image using the "rectangle" effect */
-         png_read_rows(png_ptr, NULL, row_pointers, number_of_rows);
+         png_read_rows(png_ptr, png_bytepp_NULL, &row_pointers[y],
+            number_of_rows);
 #endif no_sparkle /* use only one of these two methods */
       }
 
@@ -339,15 +377,18 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
 
    /* 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 */
-   png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
+   png_destroy_read_struct(&png_ptr, &info_ptr, png_infopp_NULL);
 
    /* close the file */
    fclose(fp);
 
    /* that's it */
-   return;
+   return (OK);
 }
 
 /* progressively read a file */
@@ -362,30 +403,33 @@ initialize_png_reader(png_structp *png_ptr, png_infop *info_ptr)
     * linked libraries.
     */
    *png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,
-       (void *)user_error_ptr, user_error_fn, user_warning_fn);
+       png_voidp user_error_ptr, user_error_fn, user_warning_fn);
 
    if (*png_ptr == NULL)
    {
       *info_ptr = NULL;
-      return ERROR;
+      return (ERROR);
    }
 
    *info_ptr = png_create_info_struct(png_ptr);
 
    if (*info_ptr == NULL)
    {
-      png_destroy_read_struct(png_ptr, info_ptr, (png_infopp)NULL);
+      png_destroy_read_struct(png_ptr, info_ptr, png_infopp_NULL);
-      return ERROR;
+      return (ERROR);
    }
 
-   if (setjmp((*png_ptr)->jmpbuf))
+   if (setjmp(png_jmpbuf((*png_ptr))))
    {
-      png_destroy_read_struct(png_ptr, info_ptr, (png_infopp)NULL);
+      png_destroy_read_struct(png_ptr, info_ptr, png_infopp_NULL);
-      return ERROR;
+      return (ERROR);
    }
 
-   /* this one's new.  You will need to provide all three
+   /* This one's new.  You will need to provide all three
     * function callbacks, even if you aren't using them all.
+    * If you aren't using all functions, you can specify NULL
+    * parameters.  Even when all three functions are NULL,
+    * you need to call png_set_progressive_read_fn().
     * These functions shouldn't be dependent on global or
     * static variables if you are decoding several images
     * simultaneously.  You should store stream specific data
@@ -396,18 +440,18 @@ initialize_png_reader(png_structp *png_ptr, png_infop *info_ptr)
    png_set_progressive_read_fn(*png_ptr, (void *)stream_data,
       info_callback, row_callback, end_callback);
 
-   return OK;
+   return (OK);
 }
 
 int
 process_data(png_structp *png_ptr, png_infop *info_ptr,
    png_bytep buffer, png_uint_32 length)
 {
-   if (setjmp((*png_ptr)->jmpbuf))
+   if (setjmp(png_jmpbuf((*png_ptr))))
    {
       /* Free the png_ptr and info_ptr memory on error */
-      png_destroy_read_struct(png_ptr, info_ptr, (png_infopp)NULL);
+      png_destroy_read_struct(png_ptr, info_ptr, png_infopp_NULL);
-      return ERROR;
+      return (ERROR);
    }
 
    /* This one's new also.  Simply give it chunks of data as
@@ -421,7 +465,7 @@ process_data(png_structp *png_ptr, png_infop *info_ptr,
     * callback, if you aren't already displaying them there.
     */
    png_process_data(*png_ptr, *info_ptr, buffer, length);
-   return OK;
+   return (OK);
 }
 
 info_callback(png_structp png_ptr, png_infop info)
@@ -438,21 +482,47 @@ info_callback(png_structp png_ptr, png_infop info)
 row_callback(png_structp png_ptr, png_bytep new_row,
    png_uint_32 row_num, int pass)
 {
-/* this function is called for every row in the image.  If the
+/*
- * image is interlacing, and you turned on the interlace handler,
+ * This function is called for every row in the image.  If the
+ * image is interlaced, and you turned on the interlace handler,
  * this function will be called for every row in every pass.
- * Some of these rows will not be changed from the previous pass.
+ *
- * When the row is not changed, the new_row variable will be NULL.
+ * In this function you will receive a pointer to new row data from
+ * libpng called new_row that is to replace a corresponding row (of
+ * the same data format) in a buffer allocated by your application.
+ * 
+ * The new row data pointer new_row may be NULL, indicating there is
+ * no new data to be replaced (in cases of interlace loading).
+ * 
+ * If new_row is not NULL then you need to call
+ * png_progressive_combine_row() to replace the corresponding row as
+ * shown below:
+ */
+   /* Check if row_num is in bounds. */
+   if((row_num >= 0) && (row_num < height))
+   {
+     /* Get pointer to corresponding row in our
+      * PNG read buffer.
+      */
+     png_bytep old_row = ((png_bytep *)our_data)[row_num];
+
+     /* If both rows are allocated then copy the new row
+      * data to the corresponding row data.
+      */
+     if((old_row != NULL) && (new_row != NULL))
+     png_progressive_combine_row(png_ptr, old_row, new_row);
+   }
+/*
  * The rows and passes are called in order, so you don't really
  * need the row_num and pass, but I'm supplying them because it
  * may make your life easier.
  *
  * For the non-NULL rows of interlaced images, you must call
- * png_progressive_combine_row() passing in the row and the
+ * png_progressive_combine_row() passing in the new row and the
- * old row.  You can call this function for NULL rows (it will
+ * old row, as demonstrated above.  You can call this function for
- * just return) and for non-interlaced images (it just does the
+ * NULL rows (it will just return) and for non-interlaced images
- * memcpy for you) if it will make the code easier.  Thus, you
+ * (it just does the png_memcpy for you) if it will make the code
- * can just do this for all cases:
+ * easier.  Thus, you can just do this for all cases:
  */
 
    png_progressive_combine_row(png_ptr, old_row, new_row);
@@ -461,8 +531,8 @@ row_callback(png_structp png_ptr, png_bytep new_row,
  * that the first pass (pass == 0 really) will completely cover
  * the old row, so the rows do not have to be initialized.  After
  * the first pass (and only for interlaced images), you will have
- * to pass the current row, and the function will combine the
+ * to pass the current row as new_row, and the function will combine
- * old row and the new row.
+ * the old row and the new row.
  */
 }
 
@@ -485,11 +555,12 @@ void write_png(char *file_name /* , ... other image information ... */)
    FILE *fp;
    png_structp png_ptr;
    png_infop info_ptr;
+   png_colorp palette;
 
    /* open the file */
    fp = fopen(file_name, "wb");
    if (fp == NULL)
-      return;
+      return (ERROR);
 
    /* Create and initialize the png_struct with the desired error handler
     * functions.  If you want to use the default stderr and longjump method,
@@ -498,12 +569,12 @@ void write_png(char *file_name /* , ... other image information ... */)
     * in case we are using dynamically linked libraries.  REQUIRED.
     */
    png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
-      (void *)user_error_ptr, user_error_fn, user_warning_fn);
+      png_voidp user_error_ptr, user_error_fn, user_warning_fn);
 
    if (png_ptr == NULL)
    {
       fclose(fp);
-      return;
+      return (ERROR);
    }
 
    /* Allocate/initialize the image information data.  REQUIRED */
@@ -511,19 +582,19 @@ void write_png(char *file_name /* , ... other image information ... */)
    if (info_ptr == NULL)
    {
       fclose(fp);
-      png_destroy_write_struct(&png_ptr,  (png_infopp)NULL);
+      png_destroy_write_struct(&png_ptr,  png_infopp_NULL);
-      return;
+      return (ERROR);
    }
 
    /* Set error handling.  REQUIRED if you aren't supplying your own
-    * error hadnling functions in the png_create_write_struct() call.
+    * error handling functions in the png_create_write_struct() call.
     */
-   if (setjmp(png_ptr->jmpbuf))
+   if (setjmp(png_jmpbuf(png_ptr)))
    {
       /* If we get here, we had a problem reading the file */
       fclose(fp);
-      png_destroy_write_struct(&png_ptr,  (png_infopp)NULL);
+      png_destroy_write_struct(&png_ptr, &info_ptr);
-      return;
+      return (ERROR);
    }
 
    /* One of the following I/O initialization functions is REQUIRED */
@@ -538,6 +609,15 @@ void write_png(char *file_name /* , ... other image information ... */)
    /* where user_io_ptr is a structure you want available to the callbacks */
 #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
+    * 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 */
+
    /* Set the image information here.  Width and height are up to 2^31,
     * bit_depth is one of 1, 2, 4, 8, or 16, but valid values also depend on
     * the color_type selected. color_type is one of PNG_COLOR_TYPE_GRAY,
@@ -550,9 +630,13 @@ void write_png(char *file_name /* , ... other image information ... */)
       PNG_INTERLACE_????, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
 
    /* set the palette if there is one.  REQUIRED for indexed-color images */
-   palette = (png_colorp)png_malloc(png_ptr, 256 * sizeof (png_color));
+   palette = (png_colorp)png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH
+             * sizeof (png_color));
    /* ... set palette colors ... */
-   png_set_PLTE(png_ptr, info_ptr, palette, 256);
+   png_set_PLTE(png_ptr, info_ptr, palette, PNG_MAX_PALETTE_LENGTH);
+   /* You must not free palette here, because png_set_PLTE only makes a link to
+      the palette that you malloced.  Wait until you are about to destroy
+      the png structure. */
 
    /* optional significant bit chunk */
    /* if we are dealing with a grayscale image then */
@@ -581,15 +665,31 @@ void write_png(char *file_name /* , ... other image information ... */)
    text_ptr[2].key = "Description";
    text_ptr[2].text = "<long text>";
    text_ptr[2].compression = PNG_TEXT_COMPRESSION_zTXt;
-   png_set_text(png_ptr, info_ptr, text_ptr, 2);
+#ifdef PNG_iTXt_SUPPORTED
+   text_ptr[0].lang = NULL;
+   text_ptr[1].lang = NULL;
+   text_ptr[2].lang = NULL;
+#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 cHRM chunk must be ignored
+   /* 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 */
 
    /* Write the file header information.  REQUIRED */
    png_write_info(png_ptr, info_ptr);
 
+   /* If you want, you can write the info in two steps, in case you need to
+    * write your private chunk ahead of PLTE:
+    *
+    *   png_write_info_before_PLTE(write_ptr, write_info_ptr);
+    *   write_my_chunk();
+    *   png_write_info(png_ptr, info_ptr);
+    *
+    * However, given the level of known- and unknown-chunk support in 1.1.0
+    * and up, this should no longer be necessary.
+    */
+
    /* Once we write out the header, the compression type on the text
     * chunks gets changed to PNG_TEXT_COMPRESSION_NONE_WR or
     * PNG_TEXT_COMPRESSION_zTXt_WR, so it doesn't get written out again
@@ -600,7 +700,7 @@ void write_png(char *file_name /* , ... other image information ... */)
     * all optional.  Only call them if you want them.
     */
 
-   /* invert monocrome pixels */
+   /* invert monochrome pixels */
    png_set_invert_mono(png_ptr);
 
    /* Shift the pixels up to a legal bit depth and fill in
@@ -638,7 +738,11 @@ void write_png(char *file_name /* , ... other image information ... */)
     * layout, however, so choose what fits your needs best).  You need to
     * use the first method if you aren't handling interlacing yourself.
     */
-   png_byte row_pointers[height][width];
+   png_uint_32 k, height, width;
+   png_byte image[height][width*bytes_per_pixel];
+   png_bytep row_pointers[height];
+   for (k = 0; k < height; k++)
+     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 */
@@ -653,36 +757,48 @@ void write_png(char *file_name /* , ... other image information ... */)
    for (pass = 0; pass < number_passes; pass++)
    {
       /* Write a few rows at a time. */
-      png_write_rows(png_ptr, row_pointers, number_of_rows);
+      png_write_rows(png_ptr, &row_pointers[first_row], number_of_rows);
 
       /* If you are only writing one row at a time, this works */
       for (y = 0; y < height; y++)
       {
-         png_bytep row_pointers = row[y];
+         png_write_rows(png_ptr, &row_pointers[y], 1);
-         png_write_rows(png_ptr, &row_pointers, 1);
       }
    }
 #endif no_entire /* use only one output method */
 
    /* You can write optional chunks like tEXt, zTXt, and tIME at the end
-    * as well.
+    * as well.  Shouldn't be necessary in 1.1.0 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.
     */
 
    /* It is REQUIRED to call this to finish writing the rest of the file */
    png_write_end(png_ptr, info_ptr);
+#endif hilevel
 
-   /* if you malloced the palette, free it here */
+   /* If you png_malloced a palette, free it here (don't free info_ptr->palette,
-   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(). */
+   png_free(png_ptr, palette);
+   palette=NULL;
 
-   /* if you allocated any text comments, free them here */
+   /* Similarly, if you png_malloced any data that you passed in with
+      png_set_something(), such as a hist or trans array, free it here,
+      when you can be sure that libpng is through with it. */
+   png_free(png_ptr, trans);
+   trans=NULL;
 
    /* clean up after the write, and free any memory allocated */
-   png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
+   png_destroy_write_struct(&png_ptr, &info_ptr);
 
    /* close the file */
    fclose(fp);
 
    /* that's it */
-   return;
+   return (OK);
 }
 
+#endif /* if 0 */

src/png/libpngpf.3

@@ -1,338 +1,548 @@
-.TH LIBPNGPF 3 "March 15, 1998"
+.TH LIBPNGPF 3 "July 8, 2002"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library
+libpng \- Portable Network Graphics (PNG) Reference Library 1.2.4
 (private functions)
 .SH SYNOPSIS
-#include <png.h>
+\fB#include <png.h>\fP
 
-void png_build_gamma_table (png_structp png_ptr);
+\fI\fB
 
-void png_build_grayscale_palette (int bit_depth, png_colorp
+\fBvoid png_build_gamma_table (png_structp \fIpng_ptr\fP\fB);\fP
-palette);
 
-void png_calculate_crc (png_structp png_ptr, png_bytep ptr,
+\fI\fB
-png_size_t length);
-void png_check_chunk_name (png_structp png_ptr, png_bytep
-chunk_name);
 
-png_size_t png_check_keyword (png_structp png_ptr, png_charp
+\fBvoid png_build_grayscale_palette (int \fP\fIbit_depth\fP\fB, png_colorp \fIpalette\fP\fB);\fP
-key, png_charpp new_key);
 
-void png_combine_row (png_structp png_ptr, png_bytep row, int
+\fI\fB
-mask);
 
-void png_correct_palette (png_structp png_ptr, png_colorp
+\fBvoid png_calculate_crc (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIptr\fP\fB, png_size_t \fIlength\fP\fB);\fP
-palette, int num_palette);
 
-int png_crc_error (png_structp png_ptr);
+\fI\fB
 
-int png_crc_finish (png_structp png_ptr, png_uint_32 skip);
+\fBvoid png_check_chunk_name (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fIchunk_name\fP\fB);\fP
 
-void png_crc_read (png_structp png_ptr, png_bytep buf,
+\fI\fB
-png_size_t length);
 
-png_voidp png_create_struct (int type);
+\fBpng_size_t png_check_keyword (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIkey\fP\fB, png_charpp \fInew_key\fP\fB);\fP
 
-void png_destroy_struct (png_voidp struct_ptr);
+\fI\fB
 
-void png_do_background (png_row_infop row_info, png_bytep row,
+\fBvoid png_combine_row (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIrow\fP\fB, int \fImask\fP\fB);\fP
-png_color_16p trans_values, png_color_16p background,
-png_color_16p background_1, png_bytep gamma_table, png_bytep
-gamma_from_1, png_bytep gamma_to_1, png_uint_16pp gamma_16,
-png_uint_16pp gamma_16_from_1, png_uint_16pp gamma_16_to_1, int
-gamma_shift);
 
-void png_do_bgr (png_row_infop row_info, png_bytep row);
+\fI\fB
 
-void png_do_chop (png_row_infop row_info, png_bytep row);
+\fBvoid png_correct_palette (png_structp \fP\fIpng_ptr\fP\fB, png_colorp \fP\fIpalette\fP\fB, int \fInum_palette\fP\fB);\fP
 
-void png_do_dither (png_row_infop row_info, png_bytep row,
+\fI\fB
-png_bytep palette_lookup, png_bytep dither_lookup);
 
-void png_do_expand (png_row_infop row_info, png_bytep row,
+\fBint png_crc_error (png_structp \fIpng_ptr\fP\fB);\fP
-png_color_16p trans_value);
 
-void png_do_expand_palette (png_row_infop row_info, png_bytep
+\fI\fB
-row, png_colorp palette, png_bytep trans, int num_trans);
 
-void png_do_gamma (png_row_infop row_info, png_bytep row,
+\fBint png_crc_finish (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fIskip\fP\fB);\fP
-png_bytep gamma_table, png_uint_16pp gamma_16_table, int
-gamma_shift);
 
-void png_do_gray_to_rgb (png_row_infop row_info, png_bytep
+\fI\fB
-row);
 
-void png_do_invert (png_row_infop row_info, png_bytep row);
+\fBvoid png_crc_read (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIbuf\fP\fB, png_size_t \fIlength\fP\fB);\fP
 
-void png_do_pack (png_row_infop row_info, png_bytep row,
+\fI\fB
-png_uint_32 bit_depth);
 
-void png_do_packswap (png_row_infop row_info, png_bytep row);
+\fBpng_voidp png_create_struct (int \fItype\fP\fB);\fP
 
-void png_do_read_filler (png_row_infop row_info, png_bytep row,
+\fI\fB
-png_uint_32 filler, png_uint_32 flags);
 
-void png_do_read_interlace (png_row_infop row_info, png_bytep
+\fBpng_voidp png_create_struct_2 (int \fP\fItype\fP\fB, png_malloc_ptr \fP\fImalloc_fn\fP\fB, png_voidp \fImem_ptr\fP\fB);\fP
-row, int pass, png_uint_32 transformations);
 
-void png_do_read_invert_alpha (png_row_infop row_info,
+\fI\fB
-png_bytep row);
 
-void png_do_read_swap_alpha (png_row_infop row_info, png_bytep
+\fBpng_charp png_decompress_chunk (png_structp \fP\fIpng_ptr\fP\fB, int \fP\fIcomp_type\fP\fB, png_charp \fP\fIchunkdata\fP\fB, png_size_t \fP\fIchunklength\fP\fB, png_size_t \fP\fIprefix_length\fP\fB, png_size_t \fI*data_length\fP\fB);\fP
-row);
 
-void png_do_read_transformations (png_structp png_ptr);
+\fI\fB
 
-void png_do_rgb_to_gray (png_row_infop row_info, png_bytep
+\fBvoid png_destroy_struct (png_voidp \fIstruct_ptr\fP\fB);\fP
-row);
 
-void png_do_shift (png_row_infop row_info, png_bytep row,
+\fI\fB
-png_color_8p bit_depth);
 
-void png_do_strip_filler (png_row_infop row_info, png_bytep
+\fBvoid png_destroy_struct_2 (png_voidp \fP\fIstruct_ptr\fP\fB, png_free_ptr \fP\fIfree_fn\fP\fB, png_voidp \fImem_ptr\fP\fB);\fP
-row, png_uint_32 flags);
 
-void png_do_swap (png_row_infop row_info, png_bytep row);
+\fI\fB
 
-void png_do_unpack (png_row_infop row_info, png_bytep row);
+\fBvoid png_do_background (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_color_16p \fP\fItrans_values\fP\fB, png_color_16p \fP\fIbackground\fP\fB, png_color_16p \fP\fIbackground_1\fP\fB, png_bytep \fP\fIgamma_table\fP\fB, png_bytep \fP\fIgamma_from_1\fP\fB, png_bytep \fP\fIgamma_to_1\fP\fB, png_uint_16pp \fP\fIgamma_16\fP\fB, png_uint_16pp \fP\fIgamma_16_from_1\fP\fB, png_uint_16pp \fP\fIgamma_16_to_1\fP\fB, int \fIgamma_shift\fP\fB);\fP
 
-void png_do_unshift (png_row_infop row_info, png_bytep row,
+\fI\fB
-png_color_8p sig_bits);
 
-void png_do_write_interlace (png_row_infop row_info, png_bytep
+\fBvoid png_do_bgr (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-row, int pass);
 
-void png_do_write_invert_alpha (png_row_infop row_info,
+\fI\fB
-png_bytep row);
 
-void png_do_write_swap_alpha (png_row_infop row_info, png_bytep
+\fBvoid png_do_chop (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-row);
 
-void png_do_write_transformations (png_structp png_ptr);
+\fI\fB
 
-void *png_far_to_near (png_structp png_ptr,png_voidp ptr,
+\fBvoid png_do_dither (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_bytep \fP\fIpalette_lookup\fP\fB, png_bytep \fIdither_lookup\fP\fB);\fP
-int check);
 
-void png_flush (png_structp png_ptr);
+\fI\fB
 
-png_int_32 png_get_int_32 (png_bytep buf);
+\fBvoid png_do_expand (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_color_16p \fItrans_value\fP\fB);\fP
 
-png_uint_16 png_get_uint_16 (png_bytep buf);
+\fI\fB
 
-png_uint_32 png_get_uint_32 (png_bytep buf);
+\fBvoid png_do_expand_palette (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_colorp \fP\fIpalette\fP\fB, png_bytep \fP\fItrans\fP\fB, int \fInum_trans\fP\fB);\fP
 
-void png_handle_bKGD (png_structp png_ptr, png_infop info_ptr,
+\fI\fB
-png_uint_32 length);
 
-void png_handle_cHRM (png_structp png_ptr, png_infop info_ptr,
+\fBvoid png_do_gamma (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_bytep \fP\fIgamma_table\fP\fB, png_uint_16pp \fP\fIgamma_16_table\fP\fB, int \fIgamma_shift\fP\fB);\fP
-png_uint_32 length);
 
-void png_handle_gAMA (png_structp png_ptr, png_infop info_ptr,
+\fI\fB
-png_uint_32 length);
 
-void png_handle_hIST (png_structp png_ptr, png_infop info_ptr,
+\fBvoid png_do_gray_to_rgb (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-png_uint_32 length);
 
-void png_handle_IEND (png_structp png_ptr, png_infop info_ptr,
+\fI\fB
-png_uint_32 length);
 
-void png_handle_IHDR (png_structp png_ptr, png_infop info_ptr,
+\fBvoid png_do_invert (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-png_uint_32 length);
 
-void png_handle_oFFs (png_structp png_ptr, png_infop info_ptr,
+\fI\fB
-png_uint_32 length);
 
-void png_handle_pCAL (png_structp png_ptr, png_infop info_ptr,
+\fBvoid png_do_pack (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_uint_32 \fIbit_depth\fP\fB);\fP
-png_uint_32 length);
 
-void png_handle_pHYs (png_structp png_ptr, png_infop info_ptr,
+\fI\fB
-png_uint_32 length);
 
-void png_handle_PLTE (png_structp png_ptr, png_infop info_ptr,
+\fBvoid png_do_packswap (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-png_uint_32 length);
 
-void png_handle_sBIT (png_structp png_ptr, png_infop info_ptr,
+\fI\fB
-png_uint_32 length);
 
-void png_handle_sRGB (png_structp png_ptr, png_infop info_ptr,
+\fBvoid png_do_read_filler (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_uint_32 \fP\fIfiller\fP\fB, png_uint_32 \fIflags\fP\fB);\fP
-png_uint_32 length);
 
-void png_handle_tEXt (png_structp png_ptr, png_infop info_ptr,
+\fI\fB
-png_uint_32 length);
 
-void png_handle_tIME (png_structp png_ptr, png_infop info_ptr,
+\fBvoid png_do_read_interlace (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, int \fP\fIpass\fP\fB, png_uint_32 \fItransformations\fP\fB);\fP
-png_uint_32 length);
 
-void png_handle_tRNS (png_structp png_ptr, png_infop info_ptr,
+\fI\fB
-png_uint_32 length);
 
-void png_handle_unknown (png_structp png_ptr, png_infop
+\fBvoid png_do_read_invert_alpha (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-info_ptr, png_uint_32 length);
 
-void png_handle_zTXt (png_structp png_ptr, png_infop info_ptr,
+\fI\fB
-png_uint_32 length);
 
-void png_info_destroy (png_structp png_ptr, png_infop
+\fBvoid png_do_read_swap_alpha (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-info_ptr);
 
-void png_init_read_transformations (png_structp png_ptr);
+\fI\fB
 
-void png_process_IDAT_data (png_structp png_ptr, png_bytep
+\fBvoid png_do_read_transformations (png_structp \fIpng_ptr\fP\fB);\fP
-buffer, png_size_t buffer_length);
 
-void png_process_some_data (png_structp png_ptr, png_infop
+\fI\fB
-info_ptr);
 
-void png_push_check_crc (png_structp png_ptr);
+\fBint png_do_rgb_to_gray (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
 
-void png_push_crc_finish (png_structp png_ptr);
+\fI\fB
 
-void png_push_crc_skip (png_structp png_ptr, png_uint_32
+\fBvoid png_do_shift (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_color_8p \fIbit_depth\fP\fB);\fP
-length);
 
-void png_push_fill_buffer (png_structp png_ptr, png_bytep
+\fI\fB
-buffer, png_size_t length);
 
-void png_push_handle_tEXt (png_structp png_ptr, png_infop
+\fBvoid png_do_strip_filler (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_uint_32 \fIflags\fP\fB);\fP
-info_ptr, png_uint_32 length);
 
-void png_push_handle_unknown (png_structp png_ptr, png_infop
+\fI\fB
-info_ptr, png_uint_32 length);
 
-void png_push_handle_zTXt (png_structp png_ptr, png_infop
+\fBvoid png_do_swap (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-info_ptr, png_uint_32 length);
 
-void png_push_have_end (png_structp png_ptr, png_infop
+\fI\fB
-info_ptr);
 
-void png_push_have_info (png_structp png_ptr, png_infop
+\fBvoid png_do_unpack (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-info_ptr);
 
-void png_push_have_row (png_structp png_ptr, png_bytep row);
+\fI\fB
 
-void png_push_process_row (png_structp png_ptr);
+\fBvoid png_do_unshift (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_color_8p \fIsig_bits\fP\fB);\fP
 
-void png_push_read_chunk (png_structp png_ptr, png_infop
+\fI\fB
-info_ptr);
 
-void png_push_read_end (png_structp png_ptr, png_infop
+\fBvoid png_do_write_interlace (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, int \fIpass\fP\fB);\fP
-info_ptr);
 
-void png_push_read_IDAT (png_structp png_ptr);
+\fI\fB
 
-void png_push_read_sig (png_structp png_ptr, png_infop
+\fBvoid png_do_write_invert_alpha (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-info_ptr);
 
-void png_push_read_tEXt (png_structp png_ptr, png_infop
+\fI\fB
-info_ptr);
 
-void png_push_read_zTXt (png_structp png_ptr, png_infop
+\fBvoid png_do_write_swap_alpha (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-info_ptr);
 
-void png_push_restore_buffer (png_structp png_ptr, png_bytep
+\fI\fB
-buffer, png_size_t buffer_length);
 
-void png_push_save_buffer (png_structp png_ptr);
+\fBvoid png_do_write_transformations (png_structp \fIpng_ptr\fP\fB);\fP
 
-void png_read_data (png_structp png_ptr, png_bytep data,
+\fI\fB
-png_size_t length);
 
-void png_read_filter_row (png_structp png_ptr, png_row_infop
+\fBvoid *png_far_to_near (png_structp png_ptr,png_voidp \fP\fIptr\fP\fB, int \fIcheck\fP\fB);\fP
-row_info, png_bytep row, png_bytep prev_row, int filter);
 
-void png_read_finish_row (png_structp png_ptr);
+\fI\fB
 
-void png_read_init (png_structp png_ptr);
+\fBvoid png_flush (png_structp \fIpng_ptr\fP\fB);\fP
 
-void png_read_push_finish_row (png_structp png_ptr);
+\fI\fB
 
-void png_read_start_row (png_structp png_ptr);
+\fBpng_int_32 png_get_int_32 (png_bytep \fIbuf\fP\fB);\fP
 
-void png_read_transform_info (png_structp png_ptr, png_infop
+\fI\fB
-info_ptr);
 
-void png_reset_crc (png_structp png_ptr);
+\fBpng_uint_16 png_get_uint_16 (png_bytep \fIbuf\fP\fB);\fP
 
-void png_save_int_32 (png_bytep buf, png_int_32 i);
+\fI\fB
 
-void png_save_uint_16 (png_bytep buf, unsigned int i);
+\fBpng_uint_32 png_get_uint_32 (png_bytep \fIbuf\fP\fB);\fP
 
-void png_save_uint_32 (png_bytep buf, png_uint_32 i);
+\fI\fB
 
-void png_write_bKGD (png_structp png_ptr, png_color_16p values,
+\fBvoid png_handle_bKGD (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-int color_type);
 
-void png_write_cHRM (png_structp png_ptr, double white_x,
+\fI\fB
-double white_y, double red_x, double red_y, double green_x,
-double green_y, double blue_x, double blue_y);
 
-void png_write_data (png_structp png_ptr, png_bytep data,
+\fBvoid png_handle_cHRM (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-png_size_t length);
-void png_write_filtered_row (png_structp png_ptr, png_bytep
-filtered_row);
 
-void png_write_find_filter (png_structp png_ptr, png_row_infop
+\fI\fB
-row_info);
 
-void png_write_finish_row (png_structp png_ptr);
+\fBvoid png_handle_gAMA (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
 
-void png_write_gAMA (png_structp png_ptr, double file_gamma);
+\fI\fB
 
-void png_write_hIST (png_structp png_ptr, png_uint_16p hist,
+\fBvoid png_handle_hIST (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-int num_hist);
 
-void png_write_init (png_structp png_ptr);
+\fI\fB
 
-void png_write_IDAT (png_structp png_ptr, png_bytep data,
+\fBvoid png_handle_IEND (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-png_size_t length);
 
-void png_write_IEND (png_structp png_ptr);
+\fI\fB
 
-void png_write_IHDR (png_structp png_ptr, png_uint_32 width,
+\fBvoid png_handle_IHDR (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-png_uint_32 height, int bit_depth, int color_type, int
-compression_type, int filter_type, int interlace_type);
 
-void png_write_oFFs (png_structp png_ptr, png_uint_32 x_offset,
+\fI\fB
-png_uint_32 y_offset, int unit_type);
 
-void png_write_pCAL (png_structp png_ptr, png_charp purpose,
+\fBvoid png_handle_iCCP (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-png_int_32 X0, png_int_32 X1, int type, int nparams, png_charp
-units, png_charpp params);
 
-void png_write_pHYs (png_structp png_ptr, png_uint_32
+\fI\fB
-x_pixels_per_unit, png_uint_32 y_pixels_per_unit, int
-unit_type);
 
-void png_write_PLTE (png_structp png_ptr, png_colorp palette,
+\fBvoid png_handle_iTXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-png_uint_32 num_pal);
 
-void png_write_sBIT (png_structp png_ptr, png_color_8p sbit,
+\fI\fB
-int color_type);
 
-void png_write_sig (png_structp png_ptr);
+\fBvoid png_handle_oFFs (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
 
-void png_write_sRGB (png_structp png_ptr, int intent);
+\fI\fB
 
-void png_write_start_row (png_structp png_ptr);
+\fBvoid png_handle_pCAL (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
 
-void png_write_tEXt (png_structp png_ptr, png_charp key,
+\fI\fB
-png_charp text, png_size_t text_len);
 
-void png_write_tIME (png_structp png_ptr, png_timep mod_time);
+\fBvoid png_handle_pHYs (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
 
-void png_write_tRNS (png_structp png_ptr, png_bytep trans,
+\fI\fB
-png_color_16p values, int number, int color_type);
 
-void png_write_zTXt (png_structp png_ptr, png_charp key,
+\fBvoid png_handle_PLTE (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-png_charp text, png_size_t text_len, int compression);
 
-voidpf png_zalloc (voidpf png_ptr, uInt items, uInt size);
+\fI\fB
 
-void png_zfree (voidpf png_ptr, voidpf ptr);
+\fBvoid png_handle_sBIT (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_handle_sCAL (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_handle_sPLT (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_handle_sRGB (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_handle_tEXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_handle_tIME (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_handle_tRNS (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_handle_unknown (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_handle_zTXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_info_destroy (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_init_mmx_flags (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_init_read_transformations (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_process_IDAT_data (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIbuffer\fP\fB, png_size_t \fIbuffer_length\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_process_some_data (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_check_crc (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_crc_finish (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_crc_skip (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_fill_buffer (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIbuffer\fP\fB, png_size_t \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_handle_tEXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_handle_unknown (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_handle_zTXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_have_end (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_have_info (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_have_row (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fIrow\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_process_row (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_read_chunk (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_read_end (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_read_IDAT (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_read_sig (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_read_tEXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_read_zTXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_restore_buffer (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIbuffer\fP\fB, png_size_t \fIbuffer_length\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_save_buffer (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_read_data (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIdata\fP\fB, png_size_t \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_read_filter_row (png_structp \fP\fIpng_ptr\fP\fB, png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_bytep \fP\fIprev_row\fP\fB, int \fIfilter\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_read_finish_row (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_read_push_finish_row (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_read_start_row (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_read_transform_info (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_reset_crc (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_save_int_32 (png_bytep \fP\fIbuf\fP\fB, png_int_32 \fIi\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_save_uint_16 (png_bytep \fP\fIbuf\fP\fB, unsigned int \fIi\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_save_uint_32 (png_bytep \fP\fIbuf\fP\fB, png_uint_32 \fIi\fP\fB);\fP
+
+\fI\fB
+
+\fBint png_set_text_2 (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_textp \fP\fItext_ptr\fP\fB, int \fInum_text)\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_cHRM (png_structp \fP\fIpng_ptr\fP\fB, double \fP\fIwhite_x\fP\fB, double \fP\fIwhite_y\fP\fB, double \fP\fIred_x\fP\fB, double \fP\fIred_y\fP\fB, double \fP\fIgreen_x\fP\fB, double \fP\fIgreen_y\fP\fB, double \fP\fIblue_x\fP\fB, double \fIblue_y\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_cHRM_fixed (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fP\fIwhite_x\fP\fB, png_uint_32 \fP\fIwhite_y\fP\fB, png_uint_32 \fP\fIred_x\fP\fB, png_uint_32 \fP\fIred_y\fP\fB, png_uint_32 \fP\fIgreen_x\fP\fB, png_uint_32 \fP\fIgreen_y\fP\fB, png_uint_32 \fP\fIblue_x\fP\fB, png_uint_32 \fIblue_y\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_data (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIdata\fP\fB, png_size_t \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_filtered_row (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fIfiltered_row\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_find_filter (png_structp \fP\fIpng_ptr\fP\fB, png_row_infop \fIrow_info\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_finish_row (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_gAMA (png_structp \fP\fIpng_ptr\fP\fB, double \fIfile_gamma\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_gAMA_fixed (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fIint_file_gamma\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_hIST (png_structp \fP\fIpng_ptr\fP\fB, png_uint_16p \fP\fIhist\fP\fB, int \fInum_hist\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_iCCP (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIname\fP\fB, int \fP\fIcompression_type\fP\fB, png_charp \fP\fIprofile\fP\fB, int \fIproflen\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_IDAT (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIdata\fP\fB, png_size_t \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_IEND (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_IHDR (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fP\fIwidth\fP\fB, png_uint_32 \fP\fIheight\fP\fB, int \fP\fIbit_depth\fP\fB, int \fP\fIcolor_type\fP\fB, int \fP\fIcompression_type\fP\fB, int \fP\fIfilter_type\fP\fB, int \fIinterlace_type\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_iTXt (png_structp \fP\fIpng_ptr\fP\fB, int \fP\fIcompression\fP\fB, png_charp \fP\fIkey\fP\fB, png_charp \fP\fIlang\fP\fB, png_charp \fP\fItranslated_key\fP\fB, png_charp \fItext)\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_oFFs (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fP\fIx_offset\fP\fB, png_uint_32 \fP\fIy_offset\fP\fB, int \fIunit_type\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_pCAL (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIpurpose\fP\fB, png_int_32 \fP\fIX0\fP\fB, png_int_32 \fP\fIX1\fP\fB, int \fP\fItype\fP\fB, int \fP\fInparams\fP\fB, png_charp \fP\fIunits\fP\fB, png_charpp \fIparams\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_pHYs (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fP\fIx_pixels_per_unit\fP\fB, png_uint_32 \fP\fIy_pixels_per_unit\fP\fB, int \fIunit_type\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_PLTE (png_structp \fP\fIpng_ptr\fP\fB, png_colorp \fP\fIpalette\fP\fB, png_uint_32 \fInum_pal\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_sBIT (png_structp \fP\fIpng_ptr\fP\fB, png_color_8p \fP\fIsbit\fP\fB, int \fIcolor_type\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_sCAL (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIunit\fP\fB, double \fP\fIwidth\fP\fB, double \fIheight\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_sCAL_s (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIunit\fP\fB, png_charp \fP\fIwidth\fP\fB, png_charp \fIheight\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_sig (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_sRGB (png_structp \fP\fIpng_ptr\fP\fB, int \fIintent\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_sPLT (png_structp \fP\fIpng_ptr\fP\fB, png_spalette_p \fIpalette\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_start_row (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_tEXt (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIkey\fP\fB, png_charp \fP\fItext\fP\fB, png_size_t \fItext_len\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_tIME (png_structp \fP\fIpng_ptr\fP\fB, png_timep \fImod_time\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_tRNS (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fItrans\fP\fB, png_color_16p \fP\fIvalues\fP\fB, int \fP\fInumber\fP\fB, int \fIcolor_type\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_zTXt (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIkey\fP\fB, png_charp \fP\fItext\fP\fB, png_size_t \fP\fItext_len\fP\fB, int \fIcompression\fP\fB);\fP
+
+\fI\fB
+
+\fBvoidpf png_zalloc (voidpf \fP\fIpng_ptr\fP\fB, uInt \fP\fIitems\fP\fB, uInt \fIsize\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_zfree (voidpf \fP\fIpng_ptr\fP\fB, voidpf \fIptr\fP\fB);\fP
+
+\fI\fB
 
 .SH DESCRIPTION
 The functions listed above are used privately by libpng
-and are not recommended for use by applications.  They
+and are not recommended for use by applications.  They are
+not "exported" to applications using shared libraries.  They
 are listed alphabetically here as an aid to libpng maintainers.
 See png.h for more information on these functions.
 

src/png/png.5

@@ -1,4 +1,4 @@
-.TH PNG 5 "March 15, 1998"
+.TH PNG 5 "July 8, 2002"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION
@@ -20,7 +20,16 @@ platforms.
 .SH "SEE ALSO"
 .IR libpng(3), zlib(3), deflate(5), and zlib(5)
 .LP
-PNG specification:
+PNG 1.2 specification, July 1999:
+.IP
+.br
+http://www.libpng.org/pub/png
+.br
+or ftp://ftp.uu.net/graphics/png/documents
+.LP
+PNG 1.0 specification, October 1996:
+.IP
+.br
 RFC 2083
 .IP
 .br
@@ -32,12 +41,19 @@ http://www.w3.org/TR/REC-png.html
 .SH AUTHORS
 This man page: Glenn Randers-Pehrson
 .LP
+Portable Network Graphics (PNG) Specification Version 1.2 (July 8, 1999):
+Glenn Randers-Pehrson and others (png-list@ccrc.wustl.edu).
+.LP
 Portable Network Graphics (PNG) Specification Version 1.0 (October 1, 1996):
-Thomas Boutell and others (png-list@dworkin.wustl.edu).
+Thomas Boutell and others (png-list@ccrc.wustl.edu).
 .LP
 
+
 .SH COPYRIGHT NOTICE
-The PNG specification is copyright (c) 1996 Massachussets Institute of
+The PNG-1.2 specification is copyright (c) 1999 Glenn Randers-Pehrson.
+See the specification for conditions of use and distribution.
+.LP
+The PNG-1.0 specification is copyright (c) 1996 Massachusetts Institute of
 Technology.  See the specification for conditions of use and distribution.
 .LP
 .\" end of man page

src/png/png.c

@@ -1,92 +1,101 @@
 
 /* png.c - location for general purpose libpng functions
  *
- * libpng 1.0.1
+ * libpng version 1.2.4 - July 8, 2002
- * For conditions of distribution and use, see copyright notice in png.h
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * Copyright (c) 1996, 1997 Andreas Dilger
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- * Copyright (c) 1998, Glenn Randers-Pehrson
+ *
- * March 15, 1998
  */
 
 #define PNG_INTERNAL
 #define PNG_NO_EXTERN
 #include "png.h"
 
+/* Generate a compiler error if there is an old png.h in the search path. */
+typedef version_1_2_4 Your_png_h_is_not_version_1_2_4;
+
 /* Version information for C files.  This had better match the version
- * string defined in png.h.
+ * string defined in png.h.  */
- */
-char png_libpng_ver[12] = "1.0.1";
 
+#ifdef PNG_USE_GLOBAL_ARRAYS
+/* png_libpng_ver was changed to a function in version 1.0.5c */
+const char png_libpng_ver[18] = "1.2.4";
+
+/* png_sig was changed to a function in version 1.0.5c */
 /* Place to hold the signature string for a PNG file. */
-png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
+const png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
 
-/* Constant strings for known chunk types.  If you need to add a chunk,
+/* Invoke global declarations for constant strings for known chunk types */
- * add a string holding the name here.  If you want to make the code
+PNG_IHDR;
- * portable to EBCDIC machines, use ASCII numbers, not characters.
+PNG_IDAT;
- */
+PNG_IEND;
-png_byte FARDATA png_IHDR[5] = { 73,  72,  68,  82, '\0'};
+PNG_PLTE;
-png_byte FARDATA png_IDAT[5] = { 73,  68,  65,  84, '\0'};
+PNG_bKGD;
-png_byte FARDATA png_IEND[5] = { 73,  69,  78,  68, '\0'};
+PNG_cHRM;
-png_byte FARDATA png_PLTE[5] = { 80,  76,  84,  69, '\0'};
+PNG_gAMA;
-png_byte FARDATA png_bKGD[5] = { 98,  75,  71,  68, '\0'};
+PNG_hIST;
-png_byte FARDATA png_cHRM[5] = { 99,  72,  82,  77, '\0'};
+PNG_iCCP;
-png_byte FARDATA png_gAMA[5] = {103,  65,  77,  65, '\0'};
+PNG_iTXt;
-png_byte FARDATA png_hIST[5] = {104,  73,  83,  84, '\0'};
+PNG_oFFs;
-png_byte FARDATA png_oFFs[5] = {111,  70,  70, 115, '\0'};
+PNG_pCAL;
-png_byte FARDATA png_pCAL[5] = {112,  67,  65,  76, '\0'};
+PNG_sCAL;
-png_byte FARDATA png_pHYs[5] = {112,  72,  89, 115, '\0'};
+PNG_pHYs;
-png_byte FARDATA png_sBIT[5] = {115,  66,  73,  84, '\0'};
+PNG_sBIT;
-png_byte FARDATA png_sRGB[5] = {115,  82,  71,  66, '\0'};
+PNG_sPLT;
-png_byte FARDATA png_tEXt[5] = {116,  69,  88, 116, '\0'};
+PNG_sRGB;
-png_byte FARDATA png_tIME[5] = {116,  73,  77,  69, '\0'};
+PNG_tEXt;
-png_byte FARDATA png_tRNS[5] = {116,  82,  78,  83, '\0'};
+PNG_tIME;
-png_byte FARDATA png_zTXt[5] = {122,  84,  88, 116, '\0'};
+PNG_tRNS;
+PNG_zTXt;
 
 /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
 
 /* start of interlace block */
-int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
+const int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
 
 /* offset to next interlace block */
-int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
+const int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
 
 /* start of interlace block in the y direction */
-int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
+const int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
 
 /* offset to next interlace block in the y direction */
-int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
+const int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
 
-/* Width of interlace block.  This is not currently used - if you need
+/* width of interlace block (used in assembler routines only) */
- * it, uncomment it here and in png.h
+#ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
-int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
+const int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
-*/
+#endif
 
 /* Height of interlace block.  This is not currently used - if you need
  * it, uncomment it here and in png.h
-int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
+const int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
 */
 
 /* Mask to determine which pixels are valid in a pass */
-int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
+const int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
 
 /* Mask to determine which pixels to overwrite while displaying */
-int FARDATA png_pass_dsp_mask[] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
+const int FARDATA png_pass_dsp_mask[]
+   = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
 
+#endif
 
 /* Tells libpng that we have already handled the first "num_bytes" bytes
  * of the PNG file signature.  If the PNG data is embedded into another
  * stream we can set num_bytes = 8 so that libpng will not attempt to read
  * or write any of the magic bytes before it starts on the IHDR.
  */
-void
+
+void PNGAPI
 png_set_sig_bytes(png_structp png_ptr, int num_bytes)
 {
    png_debug(1, "in png_set_sig_bytes\n");
    if (num_bytes > 8)
       png_error(png_ptr, "Too many bytes for PNG signature.");
 
-   png_ptr->sig_bytes = num_bytes < 0 ? 0 : num_bytes;
+   png_ptr->sig_bytes = (png_byte)(num_bytes < 0 ? 0 : num_bytes);
 }
 
 /* Checks whether the supplied bytes match the PNG signature.  We allow
@@ -97,9 +106,10 @@ png_set_sig_bytes(png_structp png_ptr, int num_bytes)
  * respectively, to be less than, to match, or be greater than the correct
  * PNG signature (this is the same behaviour as strcmp, memcmp, etc).
  */
-int
+int PNGAPI
 png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check)
 {
+   png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};
    if (num_to_check > 8)
       num_to_check = 8;
    else if (num_to_check < 1)
@@ -111,29 +121,41 @@ png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check)
    if (start + num_to_check > 8)
       num_to_check = 8 - start;
 
-   return ((int)(png_memcmp(&sig[start], &png_sig[start], num_to_check)));
+   return ((int)(png_memcmp(&sig[start], &png_signature[start], num_to_check)));
 }
 
 /* (Obsolete) function to check signature bytes.  It does not allow one
- * to check a partial signature.  This function will be removed in the
+ * to check a partial signature.  This function might be removed in the
- * future - use png_sig_cmp().
+ * future - use png_sig_cmp().  Returns true (nonzero) if the file is a PNG.
  */
-int
+int PNGAPI
 png_check_sig(png_bytep sig, int num)
 {
   return ((int)!png_sig_cmp(sig, (png_size_t)0, (png_size_t)num));
 }
 
-/* Function to allocate memory for zlib. */
+/* Function to allocate memory for zlib and clear it to 0. */
-voidpf
+#ifdef PNG_1_0_X
+void PNGAPI
+#else
+voidpf /* private */
+#endif
 png_zalloc(voidpf png_ptr, uInt items, uInt size)
 {
+   png_uint_32 num_bytes = (png_uint_32)items * size;
    png_voidp ptr;
-   png_uint_32 num_bytes;
+   png_structp p=png_ptr;
+   png_uint_32 save_flags=p->flags;
 
-   num_bytes = (png_uint_32)items * size;
+   p->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
    ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes);
-   if (num_bytes > (png_uint_32)0x8000)
+   p->flags=save_flags;
+
+#ifndef PNG_NO_ZALLOC_ZERO
+   if (ptr == NULL)
+       return ((voidpf)ptr);
+
+   if (num_bytes > (png_uint_32)0x8000L)
    {
       png_memset(ptr, 0, (png_size_t)0x8000L);
       png_memset((png_bytep)ptr + (png_size_t)0x8000L, 0,
@@ -143,11 +165,16 @@ png_zalloc(voidpf png_ptr, uInt items, uInt size)
    {
       png_memset(ptr, 0, (png_size_t)num_bytes);
    }
+#endif
    return ((voidpf)ptr);
 }
 
 /* function to free memory for zlib */
-void
+#ifdef PNG_1_0_X
+void PNGAPI
+#else
+void /* private */
+#endif
 png_zfree(voidpf png_ptr, voidpf ptr)
 {
    png_free((png_structp)png_ptr, (png_voidp)ptr);
@@ -156,7 +183,7 @@ png_zfree(voidpf png_ptr, voidpf ptr)
 /* Reset the CRC variable to 32 bits of 1's.  Care must be taken
  * in case CRC is > 32 bits to leave the top bits 0.
  */
-void
+void /* PRIVATE */
 png_reset_crc(png_structp png_ptr)
 {
    png_ptr->crc = crc32(0, Z_NULL, 0);
@@ -167,7 +194,7 @@ png_reset_crc(png_structp png_ptr)
  * also check that this data will actually be used before going to the
  * trouble of calculating it.
  */
-void
+void /* PRIVATE */
 png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length)
 {
    int need_crc = 1;
@@ -194,17 +221,21 @@ png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length)
  * and png_info_init() so that applications that want to use a shared
  * libpng don't have to be recompiled if png_info changes size.
  */
-png_infop
+png_infop PNGAPI
 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);
-   if ((info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO)) != NULL)
+#ifdef PNG_USER_MEM_SUPPORTED
-   {
+   info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO,
-      png_info_init(info_ptr);
+      png_ptr->malloc_fn, png_ptr->mem_ptr);
-   }
+#else
+   info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
+#endif
+   if (info_ptr != NULL)
+      png_info_init_3(&info_ptr, sizeof(png_info));
 
    return (info_ptr);
 }
@@ -214,7 +245,7 @@ png_create_info_struct(png_structp png_ptr)
  * png_destroy_write_struct() to free an info struct, but this may be
  * useful for some applications.
  */
-void
+void PNGAPI
 png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr)
 {
    png_infop info_ptr = NULL;
@@ -227,8 +258,13 @@ png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr)
    {
       png_info_destroy(png_ptr, info_ptr);
 
+#ifdef PNG_USER_MEM_SUPPORTED
+      png_destroy_struct_2((png_voidp)info_ptr, png_ptr->free_fn,
+          png_ptr->mem_ptr);
+#else
       png_destroy_struct((png_voidp)info_ptr);
-      *info_ptr_ptr = (png_infop)NULL;
+#endif
+      *info_ptr_ptr = NULL;
    }
 }
 
@@ -236,55 +272,323 @@ png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr)
  * and applications using it are urged to use png_create_info_struct()
  * instead.
  */
-void
+#undef png_info_init
+void PNGAPI
 png_info_init(png_infop info_ptr)
 {
-   png_debug(1, "in png_info_init\n");
+   /* We only come here via pre-1.0.12-compiled applications */
+   png_info_init_3(&info_ptr, 0);
+}
+
+void PNGAPI
+png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size)
+{
+   png_infop info_ptr = *ptr_ptr;
+
+   png_debug(1, "in png_info_init_3\n");
+
+   if(sizeof(png_info) > png_info_struct_size)
+     {
+       png_destroy_struct(info_ptr);
+       info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
+       *ptr_ptr = info_ptr;
+     }
+
    /* set everything to 0 */
    png_memset(info_ptr, 0, sizeof (png_info));
 }
 
+#ifdef PNG_FREE_ME_SUPPORTED
+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");
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+   if(freer == PNG_DESTROY_WILL_FREE_DATA)
+      info_ptr->free_me |= mask;
+   else if(freer == PNG_USER_WILL_FREE_DATA)
+      info_ptr->free_me &= ~mask;
+   else
+      png_warning(png_ptr,
+         "Unknown freer parameter in png_data_freer.");
+}
+#endif
+
+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");
+   if (png_ptr == NULL || info_ptr == NULL)
+      return;
+
+#if defined(PNG_TEXT_SUPPORTED)
+/* 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)
+#else
+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;
+     }
+   }
+   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 */
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_TRNS) & info_ptr->free_me)
+#else
+if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS))
+#endif
+{
+    png_free(png_ptr, info_ptr->trans);
+    info_ptr->valid &= ~PNG_INFO_tRNS;
+#ifndef PNG_FREE_ME_SUPPORTED
+    png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
+#endif
+    info_ptr->trans = NULL;
+}
+#endif
+
+#if defined(PNG_sCAL_SUPPORTED)
+/* free any sCAL entry */
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_SCAL) & info_ptr->free_me)
+#else
+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;
+#endif
+    info_ptr->valid &= ~PNG_INFO_sCAL;
+}
+#endif
+
+#if defined(PNG_pCAL_SUPPORTED)
+/* free any pCAL entry */
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_PCAL) & info_ptr->free_me)
+#else
+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;
+}
+#endif
+
+#if defined(PNG_iCCP_SUPPORTED)
+/* free any iCCP entry */
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_ICCP) & info_ptr->free_me)
+#else
+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;
+}
+#endif
+
+#if defined(PNG_sPLT_SUPPORTED)
+/* free a given sPLT entry, or (if num == -1) all sPLT entries */
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_SPLT) & info_ptr->free_me)
+#else
+if (mask & PNG_FREE_SPLT)
+#endif
+{
+   if (num != -1)
+   {
+      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;
+   }
+}
+#endif
+
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
+#else
+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(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;
+       }
+   }
+}
+#endif
+
+#if defined(PNG_hIST_SUPPORTED)
+/* free any hIST entry */
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_HIST)  & info_ptr->free_me)
+#else
+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;
+#ifndef PNG_FREE_ME_SUPPORTED
+    png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
+#endif
+}
+#endif
+
+/* free any PLTE entry that was internally allocated */
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_PLTE) & info_ptr->free_me)
+#else
+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;
+#ifndef PNG_FREE_ME_SUPPORTED
+    png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
+#endif
+    info_ptr->num_palette = 0;
+}
+
+#if defined(PNG_INFO_IMAGE_SUPPORTED)
+/* free any image bits attached to the info structure */
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_ROWS) & info_ptr->free_me)
+#else
+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;
+}
+#endif
+
+#ifdef PNG_FREE_ME_SUPPORTED
+   if(num == -1)
+     info_ptr->free_me &= ~mask;
+   else
+     info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL);
+#endif
+}
+
 /* This is an internal routine to free any memory that the info struct is
  * pointing to before re-using it or freeing the struct itself.  Recall
  * that png_free() checks for NULL pointers for us.
  */
-void
+void /* PRIVATE */
 png_info_destroy(png_structp png_ptr, png_infop info_ptr)
 {
-#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
-   int i;
-
    png_debug(1, "in png_info_destroy\n");
-   if (info_ptr->text != NULL)
+
+   png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
+
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+   if (png_ptr->num_chunk_list)
    {
-      for (i = 0; i < info_ptr->num_text; i++)
+       png_free(png_ptr, png_ptr->chunk_list);
-      {
+       png_ptr->chunk_list=NULL;
-         png_free(png_ptr, info_ptr->text[i].key);
+       png_ptr->num_chunk_list=0;
-      }
-      png_free(png_ptr, info_ptr->text);
-   }
-#endif
-#if defined(PNG_READ_pCAL_SUPPORTED)
-   png_free(png_ptr, info_ptr->pcal_purpose);
-   png_free(png_ptr, info_ptr->pcal_units);
-   if (info_ptr->pcal_params != NULL)
-   {
-      for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
-      {
-         png_free(png_ptr, info_ptr->pcal_params[i]);
-      }
-      png_free(png_ptr, info_ptr->pcal_params);
    }
 #endif
 
-   png_info_init(info_ptr);
+   png_info_init_3(&info_ptr, sizeof(png_info));
 }
 
 /* This function returns a pointer to the io_ptr associated with the user
  * functions.  The application should free any memory associated with this
  * pointer before png_write_destroy() or png_read_destroy() are called.
  */
-png_voidp
+png_voidp PNGAPI
 png_get_io_ptr(png_structp png_ptr)
 {
    return (png_ptr->io_ptr);
@@ -293,12 +597,209 @@ png_get_io_ptr(png_structp png_ptr)
 #if !defined(PNG_NO_STDIO)
 /* Initialize the default input/output functions for the PNG file.  If you
  * use your own read or write routines, you can call either png_set_read_fn()
- * or png_set_write_fn() instead of png_init_io().
+ * or png_set_write_fn() instead of png_init_io().  If you have defined
+ * PNG_NO_STDIO, you must use a function of your own because "FILE *" isn't
+ * necessarily available.
  */
-void
+void PNGAPI
-png_init_io(png_structp png_ptr, FILE *fp)
+png_init_io(png_structp png_ptr, png_FILE_p fp)
 {
    png_debug(1, "in png_init_io\n");
    png_ptr->io_ptr = (png_voidp)fp;
 }
 #endif
+
+#if defined(PNG_TIME_RFC1123_SUPPORTED)
+/* Convert the supplied time into an RFC 1123 string suitable for use in
+ * a "Creation Time" or other text-based time string.
+ */
+png_charp PNGAPI
+png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
+{
+   static PNG_CONST char short_months[12][4] =
+        {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
+         "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
+
+   if (png_ptr->time_buffer == NULL)
+   {
+      png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29*
+         sizeof(char)));
+   }
+
+#if defined(_WIN32_WCE)
+   {
+      wchar_t time_buf[29];
+      wsprintf(time_buf, TEXT("%d %S %d %02d:%02d:%02d +0000"),
+          ptime->day % 32, short_months[(ptime->month - 1) % 12],
+        ptime->year, ptime->hour % 24, ptime->minute % 60,
+          ptime->second % 61);
+      WideCharToMultiByte(CP_ACP, 0, time_buf, -1, png_ptr->time_buffer, 29,
+          NULL, NULL);
+   }
+#else
+#ifdef USE_FAR_KEYWORD
+   {
+      char near_time_buf[29];
+      sprintf(near_time_buf, "%d %s %d %02d:%02d:%02d +0000",
+          ptime->day % 32, short_months[(ptime->month - 1) % 12],
+          ptime->year, ptime->hour % 24, ptime->minute % 60,
+          ptime->second % 61);
+      png_memcpy(png_ptr->time_buffer, near_time_buf,
+          29*sizeof(char));
+   }
+#else
+   sprintf(png_ptr->time_buffer, "%d %s %d %02d:%02d:%02d +0000",
+       ptime->day % 32, short_months[(ptime->month - 1) % 12],
+       ptime->year, ptime->hour % 24, ptime->minute % 60,
+       ptime->second % 61);
+#endif
+#endif /* _WIN32_WCE */
+   return ((png_charp)png_ptr->time_buffer);
+}
+#endif /* PNG_TIME_RFC1123_SUPPORTED */
+
+#if 0
+/* Signature string for a PNG file. */
+png_bytep PNGAPI
+png_sig_bytes(void)
+{
+   return ((png_bytep)"\211\120\116\107\015\012\032\012");
+}
+#endif
+
+png_charp PNGAPI
+png_get_copyright(png_structp png_ptr)
+{
+   if (png_ptr != NULL || png_ptr == NULL)  /* silence compiler warning */
+   return ((png_charp) "\n libpng version 1.2.4 - July 8, 2002\n\
+   Copyright (c) 1998-2002 Glenn Randers-Pehrson\n\
+   Copyright (c) 1996-1997 Andreas Dilger\n\
+   Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.\n");
+   return ((png_charp) "");
+}
+
+/* The following return the library version as a short string in the
+ * format 1.0.0 through 99.99.99zz.  To get the version of *.h files used
+ * with your application, print out PNG_LIBPNG_VER_STRING, which is defined
+ * in png.h.
+ */
+
+png_charp PNGAPI
+png_get_libpng_ver(png_structp png_ptr)
+{
+   /* Version of *.c files used when building libpng */
+   if(png_ptr != NULL) /* silence compiler warning about unused png_ptr */
+      return((png_charp) "1.2.4");
+   return((png_charp) "1.2.4");
+}
+
+png_charp PNGAPI
+png_get_header_ver(png_structp png_ptr)
+{
+   /* Version of *.h files used when building libpng */
+   if(png_ptr != NULL) /* silence compiler warning about unused png_ptr */
+      return((png_charp) PNG_LIBPNG_VER_STRING);
+   return((png_charp) PNG_LIBPNG_VER_STRING);
+}
+
+png_charp PNGAPI
+png_get_header_version(png_structp png_ptr)
+{
+   /* Returns longer string containing both version and date */
+   if(png_ptr != NULL) /* silence compiler warning about unused png_ptr */
+      return((png_charp) PNG_HEADER_VERSION_STRING);
+   return((png_charp) PNG_HEADER_VERSION_STRING);
+}
+
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+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 */
+   int i;
+   png_bytep p;
+   if((png_ptr == NULL && chunk_name == NULL) || png_ptr->num_chunk_list<=0)
+      return 0;
+   p=png_ptr->chunk_list+png_ptr->num_chunk_list*5-5;
+   for (i = png_ptr->num_chunk_list; i; i--, p-=5)
+      if (!png_memcmp(chunk_name, p, 4))
+        return ((int)*(p+4));
+   return 0;
+}
+#endif
+
+/* This function, added to libpng-1.0.6g, is untested. */
+int PNGAPI
+png_reset_zstream(png_structp png_ptr)
+{
+   return (inflateReset(&png_ptr->zstream));
+}
+
+/* This function was added to libpng-1.0.7 */
+png_uint_32 PNGAPI
+png_access_version_number(void)
+{
+   /* Version of *.c files used when building libpng */
+   return((png_uint_32) 10204L);
+}
+
+
+#if !defined(PNG_1_0_X)
+#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
+    /* GRR:  could add this:   && defined(PNG_MMX_CODE_SUPPORTED) */
+/* this INTERNAL function was added to libpng 1.2.0 */
+void /* PRIVATE */
+png_init_mmx_flags (png_structp png_ptr)
+{
+    png_ptr->mmx_rowbytes_threshold = 0;
+    png_ptr->mmx_bitdepth_threshold = 0;
+
+#  if (defined(PNG_USE_PNGVCRD) || defined(PNG_USE_PNGGCCRD))
+
+    png_ptr->asm_flags |= PNG_ASM_FLAG_MMX_SUPPORT_COMPILED;
+
+    if (png_mmx_support()) {
+        png_ptr->asm_flags |= PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU
+#    ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
+                              | PNG_ASM_FLAG_MMX_READ_COMBINE_ROW
+#    endif
+#    ifdef PNG_HAVE_ASSEMBLER_READ_INTERLACE
+                              | PNG_ASM_FLAG_MMX_READ_INTERLACE
+#    endif
+#    ifndef PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
+                              ;
+#    else
+                              | PNG_ASM_FLAG_MMX_READ_FILTER_SUB
+                              | PNG_ASM_FLAG_MMX_READ_FILTER_UP
+                              | PNG_ASM_FLAG_MMX_READ_FILTER_AVG
+                              | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ;
+
+        png_ptr->mmx_rowbytes_threshold = PNG_MMX_ROWBYTES_THRESHOLD_DEFAULT;
+        png_ptr->mmx_bitdepth_threshold = PNG_MMX_BITDEPTH_THRESHOLD_DEFAULT;
+#    endif
+    } else {
+        png_ptr->asm_flags &= ~( PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU
+                               | PNG_MMX_READ_FLAGS
+                               | PNG_MMX_WRITE_FLAGS );
+    }
+
+#  else /* !((PNGVCRD || PNGGCCRD) && PNG_ASSEMBLER_CODE_SUPPORTED)) */
+
+    /* clear all MMX flags; no support is compiled in */
+    png_ptr->asm_flags &= ~( PNG_MMX_FLAGS );
+
+#  endif /* ?(PNGVCRD || PNGGCCRD) */
+}
+
+#endif /* !(PNG_ASSEMBLER_CODE_SUPPORTED) */
+
+/* this function was added to libpng 1.2.0 */
+#if !defined(PNG_USE_PNGGCCRD) && \
+    !(defined(PNG_ASSEMBLER_CODE_SUPPORTED) && defined(PNG_USE_PNGVCRD))
+int PNGAPI
+png_mmx_support(void)
+{
+    return -1;
+}
+#endif
+#endif /* PNG_1_0_X */

src/png/pngerror.c

@@ -1,14 +1,13 @@
 
 /* pngerror.c - stub functions for i/o and memory allocation
  *
- * libpng 1.0.1
+ * libpng 1.2.4 - July 8, 2002
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
- * Copyright (c) 1996, 1997 Andreas Dilger
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * Copyright (c) 1998, Glenn Randers-Pehrson
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- * March 15, 1998
  *
- * This file provides a location for all error handling.  Users which
+ * 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
  * at each function.
@@ -17,25 +16,59 @@
 #define PNG_INTERNAL
 #include "png.h"
 
-static void png_default_error PNGARG((png_structp png_ptr,
+static void /* PRIVATE */
-                                      png_const_charp message));
+png_default_error PNGARG((png_structp png_ptr,
-static void png_default_warning PNGARG((png_structp png_ptr,
+  png_const_charp error_message));
-                                        png_const_charp message));
+static void /* PRIVATE */
+png_default_warning PNGARG((png_structp png_ptr,
+  png_const_charp warning_message));
 
 /* This function is called whenever there is a fatal error.  This function
  * should not be changed.  If there is a need to handle errors differently,
  * you should supply a replacement error function and use png_set_error_fn()
  * to replace the error function at run-time.
  */
-void
+void PNGAPI
-png_error(png_structp png_ptr, png_const_charp message)
+png_error(png_structp png_ptr, png_const_charp error_message)
 {
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+   char msg[16];
+   if (png_ptr->flags&(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
+   {
+     int offset = 0;
+     if (*error_message == '#')
+     {
+         for (offset=1; offset<15; offset++)
+            if (*(error_message+offset) == ' ')
+                break;
+         if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
+         {
+            int i;
+            for (i=0; i<offset-1; i++)
+               msg[i]=error_message[i+1];
+            msg[i]='\0';
+            error_message=msg;
+         }
+         else
+            error_message+=offset;
+     }
+     else
+     {
+         if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
+         {
+            msg[0]='0';        
+            msg[1]='\0';
+            error_message=msg;
+         }
+     }
+   }
+#endif
    if (png_ptr->error_fn != NULL)
-      (*(png_ptr->error_fn))(png_ptr, message);
+      (*(png_ptr->error_fn))(png_ptr, error_message);
 
    /* if the following returns or doesn't exist, use the default function,
       which will not return */
-   png_default_error(png_ptr, message);
+   png_default_error(png_ptr, error_message);
 }
 
 /* This function is called whenever there is a non-fatal error.  This function
@@ -43,16 +76,29 @@ png_error(png_structp png_ptr, png_const_charp message)
  * you should supply a replacement warning function and use
  * png_set_error_fn() to replace the warning function at run-time.
  */
-void
+void PNGAPI
-png_warning(png_structp png_ptr, png_const_charp message)
+png_warning(png_structp png_ptr, png_const_charp warning_message)
 {
+     int offset = 0;
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+   if (png_ptr->flags&(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
+#endif
+   {
+     if (*warning_message == '#')
+     {
+         for (offset=1; offset<15; offset++)
+            if (*(warning_message+offset) == ' ')
+                break;
+     }
+   }
    if (png_ptr->warning_fn != NULL)
-      (*(png_ptr->warning_fn))(png_ptr, message);
+      (*(png_ptr->warning_fn))(png_ptr,
+         (png_const_charp)(warning_message+offset));
    else
-      png_default_warning(png_ptr, message);
+      png_default_warning(png_ptr, (png_const_charp)(warning_message+offset));
 }
 
-/* These utilities are used internally to build an error message which relates
+/* These utilities are used internally to build an error message that relates
  * to the current chunk.  The chunk name comes from png_ptr->chunk_name,
  * this is used to prefix the message.  The message is limited in length
  * to 63 bytes, the name characters are output as hex digits wrapped in []
@@ -60,49 +106,55 @@ png_warning(png_structp png_ptr, png_const_charp message)
  */
 #define isnonalpha(c) ((c) < 41 || (c) > 122 || ((c) > 90 && (c) < 97))
 static PNG_CONST char png_digit[16] = {
-   '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
+   '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E',
-};
+   'F' };
 
-static void
+static void /* PRIVATE */
-png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp message)
+png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp
+   error_message)
 {
    int iout = 0, iin = 0;
 
-   while (iin < 4) {
+   while (iin < 4)
+   {
       int c = png_ptr->chunk_name[iin++];
-      if (isnonalpha(c)) {
+      if (isnonalpha(c))
+      {
          buffer[iout++] = '[';
          buffer[iout++] = png_digit[(c & 0xf0) >> 4];
-         buffer[iout++] = png_digit[c & 0xf];
+         buffer[iout++] = png_digit[c & 0x0f];
          buffer[iout++] = ']';
-      } else {
+      }
-         buffer[iout++] = c;
+      else
+      {
+         buffer[iout++] = (png_byte)c;
       }
    }
 
-   if (message == NULL)
+   if (error_message == NULL)
       buffer[iout] = 0;
-   else {
+   else
+   {
       buffer[iout++] = ':';
       buffer[iout++] = ' ';
-      png_memcpy(buffer+iout, message, 64);
+      png_memcpy(buffer+iout, error_message, 64);
       buffer[iout+63] = 0;
    }
 }
 
-void
+void PNGAPI
-png_chunk_error(png_structp png_ptr, png_const_charp message)
+png_chunk_error(png_structp png_ptr, png_const_charp error_message)
 {
-   char msg[16+64];
+   char msg[18+64];
-   png_format_buffer(png_ptr, msg, message);
+   png_format_buffer(png_ptr, msg, error_message);
    png_error(png_ptr, msg);
 }
 
-void
+void PNGAPI
-png_chunk_warning(png_structp png_ptr, png_const_charp message)
+png_chunk_warning(png_structp png_ptr, png_const_charp warning_message)
 {
-   char msg[16+64];
+   char msg[18+64];
-   png_format_buffer(png_ptr, msg, message);
+   png_format_buffer(png_ptr, msg, warning_message);
    png_warning(png_ptr, msg);
 }
 
@@ -111,13 +163,39 @@ png_chunk_warning(png_structp png_ptr, png_const_charp message)
  * function is used by default, or if the program supplies NULL for the
  * error function pointer in png_set_error_fn().
  */
-static void
+static void /* PRIVATE */
-png_default_error(png_structp png_ptr, png_const_charp message)
+png_default_error(png_structp png_ptr, png_const_charp error_message)
 {
-#ifndef PNG_NO_STDIO
+#ifndef PNG_NO_CONSOLE_IO
-   fprintf(stderr, "libpng error: %s\n", message);
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+   if (*error_message == '#')
+   {
+     int offset;
+     char error_number[16];
+     for (offset=0; offset<15; offset++)
+     {
+         error_number[offset] = *(error_message+offset+1);
+         if (*(error_message+offset) == ' ')
+             break;
+     }
+     if((offset > 1) && (offset < 15))
+     {
+       error_number[offset-1]='\0';
+       fprintf(stderr, "libpng error no. %s: %s\n", error_number,
+          error_message+offset);
+     }
+     else
+       fprintf(stderr, "libpng error: %s, offset=%d\n", error_message,offset);
+   }
+   else
+#endif
+   fprintf(stderr, "libpng error: %s\n", error_message);
+#else
+   if (error_message)
+     /* make compiler happy */ ;
 #endif
 
+#ifdef PNG_SETJMP_SUPPORTED
 #  ifdef USE_FAR_KEYWORD
    {
       jmp_buf jmpbuf;
@@ -127,22 +205,51 @@ png_default_error(png_structp png_ptr, png_const_charp message)
 #  else
    longjmp(png_ptr->jmpbuf, 1);
 # endif
+#else
+   if (png_ptr)
+     /* make compiler happy */ ;
+   PNG_ABORT();
+#endif
 }
 
 /* This function is called when there is a warning, but the library thinks
  * it can continue anyway.  Replacement functions don't have to do anything
- * here if you don't want to.  In the default configuration, png_ptr is
+ * here if you don't want them to.  In the default configuration, png_ptr is
  * not used, but it is passed in case it may be useful.
  */
-static void
+static void /* PRIVATE */
-png_default_warning(png_structp png_ptr, png_const_charp message)
+png_default_warning(png_structp png_ptr, png_const_charp warning_message)
 {
-   if (png_ptr == NULL)
+#ifndef PNG_NO_CONSOLE_IO
-      return;
+#  ifdef PNG_ERROR_NUMBERS_SUPPORTED
-
+   if (*warning_message == '#')
-#ifndef PNG_NO_STDIO
+   {
-   fprintf(stderr, "libpng warning: %s\n", message);
+     int offset;
+     char warning_number[16];
+     for (offset=0; offset<15; offset++)
+     {
+        warning_number[offset]=*(warning_message+offset+1);
+        if (*(warning_message+offset) == ' ')
+            break;
+     }
+     if((offset > 1) && (offset < 15))
+     {
+       warning_number[offset-1]='\0';
+       fprintf(stderr, "libpng warning no. %s: %s\n", warning_number,
+          warning_message+offset);
+     }
+     else
+       fprintf(stderr, "libpng warning: %s\n", warning_message);
+   }
+   else
 #  endif
+     fprintf(stderr, "libpng warning: %s\n", warning_message);
+#else
+   if (warning_message)
+     /* appease compiler */ ;
+#endif
+   if (png_ptr)
+      return;
 }
 
 /* This function is called when the application wants to use another method
@@ -150,7 +257,7 @@ png_default_warning(png_structp png_ptr, png_const_charp message)
  * return to the calling routine or serious problems will occur.  The return
  * method used in the default routine calls longjmp(png_ptr->jmpbuf, 1)
  */
-void
+void PNGAPI
 png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
    png_error_ptr error_fn, png_error_ptr warning_fn)
 {
@@ -164,11 +271,21 @@ png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
  * functions.  The application should free any memory associated with this
  * pointer before png_write_destroy and png_read_destroy are called.
  */
-png_voidp
+png_voidp PNGAPI
 png_get_error_ptr(png_structp png_ptr)
 {
    return ((png_voidp)png_ptr->error_ptr);
 }
 
 
-
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+void PNGAPI
+png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode)
+{
+   if(png_ptr != NULL)
+   {
+     png_ptr->flags &=
+       ((~(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode);
+   }
+}
+#endif

src/png/pngget.c

@@ -1,18 +1,17 @@
 
 /* pngget.c - retrieval of values from info struct
  *
- * libpng 1.0.1
+ * libpng 1.2.4 - July 8, 2002
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
- * Copyright (c) 1996, 1997 Andreas Dilger
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * Copyright (c) 1998, Glenn Randers-Pehrson
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- * March 15, 1998
  */
 
 #define PNG_INTERNAL
 #include "png.h"
 
-png_uint_32
+png_uint_32 PNGAPI
 png_get_valid(png_structp png_ptr, png_infop info_ptr, png_uint_32 flag)
 {
    if (png_ptr != NULL && info_ptr != NULL)
@@ -21,7 +20,7 @@ png_get_valid(png_structp png_ptr, png_infop info_ptr, png_uint_32 flag)
       return(0);
 }
 
-png_uint_32
+png_uint_32 PNGAPI
 png_get_rowbytes(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
@@ -30,9 +29,20 @@ png_get_rowbytes(png_structp png_ptr, png_infop info_ptr)
       return(0);
 }
 
+#if defined(PNG_INFO_IMAGE_SUPPORTED)
+png_bytepp PNGAPI
+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 */
-png_uint_32
+png_uint_32 PNGAPI
 png_get_image_width(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
@@ -42,7 +52,7 @@ png_get_image_width(png_structp png_ptr, png_infop info_ptr)
    return (0);
 }
 
-png_uint_32
+png_uint_32 PNGAPI
 png_get_image_height(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
@@ -52,7 +62,7 @@ png_get_image_height(png_structp png_ptr, png_infop info_ptr)
    return (0);
 }
 
-png_byte
+png_byte PNGAPI
 png_get_bit_depth(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
@@ -62,7 +72,7 @@ png_get_bit_depth(png_structp png_ptr, png_infop info_ptr)
    return (0);
 }
 
-png_byte
+png_byte PNGAPI
 png_get_color_type(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
@@ -72,7 +82,7 @@ png_get_color_type(png_structp png_ptr, png_infop info_ptr)
    return (0);
 }
 
-png_byte
+png_byte PNGAPI
 png_get_filter_type(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
@@ -82,7 +92,7 @@ png_get_filter_type(png_structp png_ptr, png_infop info_ptr)
    return (0);
 }
 
-png_byte
+png_byte PNGAPI
 png_get_interlace_type(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
@@ -92,7 +102,7 @@ png_get_interlace_type(png_structp png_ptr, png_infop info_ptr)
    return (0);
 }
 
-png_byte
+png_byte PNGAPI
 png_get_compression_type(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
@@ -102,43 +112,48 @@ png_get_compression_type(png_structp png_ptr, png_infop info_ptr)
    return (0);
 }
 
-png_uint_32
+png_uint_32 PNGAPI
 png_get_x_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
 {
-#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
+   if (png_ptr != NULL && info_ptr != NULL)
-   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
+#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");
       if(info_ptr->phys_unit_type != PNG_RESOLUTION_METER)
           return (0);
       else return (info_ptr->x_pixels_per_unit);
    }
-   else
+#else
+   return (0);
 #endif
    return (0);
 }
 
-png_uint_32
+png_uint_32 PNGAPI
 png_get_y_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
 {
-#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
+   if (png_ptr != NULL && info_ptr != NULL)
-   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
+#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");
       if(info_ptr->phys_unit_type != PNG_RESOLUTION_METER)
           return (0);
       else return (info_ptr->y_pixels_per_unit);
    }
-   else
+#else
+   return (0);
 #endif
    return (0);
 }
 
-png_uint_32
+png_uint_32 PNGAPI
 png_get_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
 {
-#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
+   if (png_ptr != NULL && info_ptr != NULL)
-   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
+#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");
       if(info_ptr->phys_unit_type != PNG_RESOLUTION_METER ||
@@ -146,137 +161,150 @@ png_get_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
           return (0);
       else return (info_ptr->x_pixels_per_unit);
    }
-   else
+#else
+   return (0);
 #endif
    return (0);
 }
 
-float
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+float PNGAPI
 png_get_pixel_aspect_ratio(png_structp png_ptr, png_infop info_ptr)
    {
-#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
+   if (png_ptr != NULL && info_ptr != NULL)
-   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
+#if defined(PNG_pHYs_SUPPORTED)
+   if (info_ptr->valid & PNG_INFO_pHYs)
    {
       png_debug1(1, "in %s retrieval function\n", "png_get_aspect_ratio");
       if (info_ptr->x_pixels_per_unit == 0)
          return ((float)0.0);
       else
-         return ((float)info_ptr->y_pixels_per_unit
+         return ((float)((float)info_ptr->y_pixels_per_unit
-            /(float)info_ptr->x_pixels_per_unit);
+            /(float)info_ptr->x_pixels_per_unit));
    }
-   else
+#else
+   return (0.0);
 #endif
    return ((float)0.0);
 }
+#endif
 
-png_uint_32
+png_int_32 PNGAPI
 png_get_x_offset_microns(png_structp png_ptr, png_infop info_ptr)
 {
-#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
+   if (png_ptr != NULL && info_ptr != NULL)
-   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
+#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");
       if(info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
           return (0);
       else return (info_ptr->x_offset);
    }
-   else
+#else
+   return (0);
 #endif
    return (0);
 }
 
-png_uint_32
+png_int_32 PNGAPI
 png_get_y_offset_microns(png_structp png_ptr, png_infop info_ptr)
 {
-#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
+   if (png_ptr != NULL && info_ptr != NULL)
-   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
+#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");
       if(info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
           return (0);
       else return (info_ptr->y_offset);
    }
-   else
+#else
+   return (0);
 #endif
    return (0);
 }
 
-png_uint_32
+png_int_32 PNGAPI
 png_get_x_offset_pixels(png_structp png_ptr, png_infop info_ptr)
 {
-#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
+   if (png_ptr != NULL && info_ptr != NULL)
-   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
+#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");
       if(info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
           return (0);
       else return (info_ptr->x_offset);
    }
-   else
+#else
+   return (0);
 #endif
    return (0);
 }
 
-png_uint_32
+png_int_32 PNGAPI
 png_get_y_offset_pixels(png_structp png_ptr, png_infop info_ptr)
 {
-#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
+   if (png_ptr != NULL && info_ptr != NULL)
-   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
+#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");
       if(info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
           return (0);
       else return (info_ptr->y_offset);
    }
-   else
+#else
+   return (0);
 #endif
    return (0);
 }
 
-#ifdef PNG_INCH_CONVERSIONS
+#if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
-png_uint_32
+png_uint_32 PNGAPI
 png_get_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
 {
    return ((png_uint_32)((float)png_get_pixels_per_meter(png_ptr, info_ptr)
-     *.03937 +.5)
+     *.0254 +.5));
 }
 
-png_uint_32
+png_uint_32 PNGAPI
 png_get_x_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
 {
    return ((png_uint_32)((float)png_get_x_pixels_per_meter(png_ptr, info_ptr)
-     *.03937 +.5)
+     *.0254 +.5));
 }
 
-png_uint_32
+png_uint_32 PNGAPI
 png_get_y_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
 {
    return ((png_uint_32)((float)png_get_y_pixels_per_meter(png_ptr, info_ptr)
-     *.03937 +.5)
+     *.0254 +.5));
 }
 
-float
+float PNGAPI
 png_get_x_offset_inches(png_structp png_ptr, png_infop info_ptr)
 {
    return ((float)png_get_x_offset_microns(png_ptr, info_ptr)
-     *.03937/1000000. +.5)
+     *.00003937);
 }
 
-float
+float PNGAPI
 png_get_y_offset_inches(png_structp png_ptr, png_infop info_ptr)
 {
    return ((float)png_get_y_offset_microns(png_ptr, info_ptr)
-     *.03937/1000000. +.5)
+     *.00003937);
 }
 
-#if defined(PNG_READ_pHYs_SUPPORTED)
+#if defined(PNG_pHYs_SUPPORTED)
-png_uint_32
+png_uint_32 PNGAPI
 png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr,
    png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
 {
    png_uint_32 retval = 0;
 
-   if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_pHYs)
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
    {
       png_debug1(1, "in %s retrieval function\n", "pHYs");
       if (res_x != NULL)
@@ -293,23 +321,23 @@ png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr,
       {
          *unit_type = (int)info_ptr->phys_unit_type;
          retval |= PNG_INFO_pHYs;
-         if(unit_type == 1)
+         if(*unit_type == 1)
          {
-            if (res_x != NULL) *res_x = (png_uint_32)(*res_x * 39.37 + .50);
+            if (res_x != NULL) *res_x = (png_uint_32)(*res_x * .0254 + .50);
-            if (res_y != NULL) *res_y = (png_uint_32)(*res_y * 39.37 + .50);
+            if (res_y != NULL) *res_y = (png_uint_32)(*res_y * .0254 + .50);
          }
       }
    }
    return (retval);
 }
-#endif
+#endif /* PNG_pHYs_SUPPORTED */
-
+#endif  /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
-#endif  /* PNG_INCH_CONVERSIONS */
 
 /* png_get_channels really belongs in here, too, but it's been around longer */
+
 #endif  /* PNG_EASY_ACCESS_SUPPORTED */
 
-png_byte
+png_byte PNGAPI
 png_get_channels(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
@@ -318,7 +346,7 @@ png_get_channels(png_structp png_ptr, png_infop info_ptr)
       return (0);
 }
 
-png_bytep
+png_bytep PNGAPI
 png_get_signature(png_structp png_ptr, png_infop info_ptr)
 {
    if (png_ptr != NULL && info_ptr != NULL)
@@ -327,8 +355,8 @@ png_get_signature(png_structp png_ptr, png_infop info_ptr)
       return (NULL);
 }
 
-#if defined(PNG_READ_bKGD_SUPPORTED)
+#if defined(PNG_bKGD_SUPPORTED)
-png_uint_32
+png_uint_32 PNGAPI
 png_get_bKGD(png_structp png_ptr, png_infop info_ptr,
    png_color_16p *background)
 {
@@ -343,8 +371,9 @@ png_get_bKGD(png_structp png_ptr, png_infop info_ptr,
 }
 #endif
 
-#if defined(PNG_READ_cHRM_SUPPORTED)
+#if defined(PNG_cHRM_SUPPORTED)
-png_uint_32
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+png_uint_32 PNGAPI
 png_get_cHRM(png_structp png_ptr, png_infop info_ptr,
    double *white_x, double *white_y, double *red_x, double *red_y,
    double *green_x, double *green_y, double *blue_x, double *blue_y)
@@ -373,9 +402,42 @@ png_get_cHRM(png_structp png_ptr, png_infop info_ptr,
    return (0);
 }
 #endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+png_uint_32 PNGAPI
+png_get_cHRM_fixed(png_structp png_ptr, png_infop info_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)
+{
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
+   {
+      png_debug1(1, "in %s retrieval function\n", "cHRM");
+      if (white_x != NULL)
+         *white_x = info_ptr->int_x_white;
+      if (white_y != NULL)
+         *white_y = info_ptr->int_y_white;
+      if (red_x != NULL)
+         *red_x = info_ptr->int_x_red;
+      if (red_y != NULL)
+         *red_y = info_ptr->int_y_red;
+      if (green_x != NULL)
+         *green_x = info_ptr->int_x_green;
+      if (green_y != NULL)
+         *green_y = info_ptr->int_y_green;
+      if (blue_x != NULL)
+         *blue_x = info_ptr->int_x_blue;
+      if (blue_y != NULL)
+         *blue_y = info_ptr->int_y_blue;
+      return (PNG_INFO_cHRM);
+   }
+   return (0);
+}
+#endif
+#endif
 
-#if defined(PNG_READ_gAMA_SUPPORTED)
+#if defined(PNG_gAMA_SUPPORTED)
-png_uint_32
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+png_uint_32 PNGAPI
 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)
@@ -388,9 +450,25 @@ png_get_gAMA(png_structp png_ptr, png_infop info_ptr, double *file_gamma)
    return (0);
 }
 #endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+png_uint_32 PNGAPI
+png_get_gAMA_fixed(png_structp png_ptr, png_infop info_ptr,
+    png_fixed_point *int_file_gamma)
+{
+   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");
+      *int_file_gamma = info_ptr->int_gamma;
+      return (PNG_INFO_gAMA);
+   }
+   return (0);
+}
+#endif
+#endif
 
-#if defined(PNG_READ_sRGB_SUPPORTED)
+#if defined(PNG_sRGB_SUPPORTED)
-png_uint_32
+png_uint_32 PNGAPI
 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)
@@ -404,8 +482,41 @@ png_get_sRGB(png_structp png_ptr, png_infop info_ptr, int *file_srgb_intent)
 }
 #endif
 
-#if defined(PNG_READ_hIST_SUPPORTED)
+#if defined(PNG_iCCP_SUPPORTED)
-png_uint_32
+png_uint_32 PNGAPI
+png_get_iCCP(png_structp png_ptr, png_infop info_ptr,
+             png_charpp name, int *compression_type,
+             png_charpp profile, png_uint_32 *proflen)
+{
+   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");
+      *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. */
+      *proflen = (int)info_ptr->iccp_proflen;
+      *compression_type = (int)info_ptr->iccp_compression;
+      return (PNG_INFO_iCCP);
+   }
+   return (0);
+}
+#endif
+
+#if defined(PNG_sPLT_SUPPORTED)
+png_uint_32 PNGAPI
+png_get_sPLT(png_structp png_ptr, png_infop info_ptr,
+             png_sPLT_tpp spalettes)
+{
+   if (png_ptr != NULL && info_ptr != NULL && spalettes != NULL)
+     *spalettes = info_ptr->splt_palettes;
+   return ((png_uint_32)info_ptr->splt_palettes_num);
+}
+#endif
+
+#if defined(PNG_hIST_SUPPORTED)
+png_uint_32 PNGAPI
 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)
@@ -419,7 +530,7 @@ png_get_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p *hist)
 }
 #endif
 
-png_uint_32
+png_uint_32 PNGAPI
 png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
    png_uint_32 *width, png_uint_32 *height, int *bit_depth,
    int *color_type, int *interlace_type, int *compression_type,
@@ -436,7 +547,11 @@ png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
       *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");
       *color_type = info_ptr->color_type;
+      if (info_ptr->color_type > 6)
+        png_error(png_ptr, "Invalid color type");
       if (compression_type != NULL)
          *compression_type = info_ptr->compression_type;
       if (filter_type != NULL)
@@ -455,9 +570,13 @@ png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
          channels++;
       pixel_depth = *bit_depth * channels;
       rowbytes_per_pixel = (pixel_depth + 7) >> 3;
-      if ((*width > (png_uint_32)2147483647L/rowbytes_per_pixel))
+      if (width == 0 || *width > PNG_MAX_UINT)
+        png_error(png_ptr, "Invalid image width");
+      if (height == 0 || *height > PNG_MAX_UINT)
+        png_error(png_ptr, "Invalid image height");
+      if (*width > PNG_MAX_UINT/rowbytes_per_pixel - 64)
       {
-         png_warning(png_ptr,
+         png_error(png_ptr,
             "Width too large for libpng to process image data.");
       }
       return (1);
@@ -465,10 +584,10 @@ png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
    return (0);
 }
 
-#if defined(PNG_READ_oFFs_SUPPORTED)
+#if defined(PNG_oFFs_SUPPORTED)
-png_uint_32
+png_uint_32 PNGAPI
 png_get_oFFs(png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 *offset_x, png_uint_32 *offset_y, int *unit_type)
+   png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type)
 {
    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)
       && offset_x != NULL && offset_y != NULL && unit_type != NULL)
@@ -483,14 +602,14 @@ png_get_oFFs(png_structp png_ptr, png_infop info_ptr,
 }
 #endif
 
-#if defined(PNG_READ_pCAL_SUPPORTED)
+#if defined(PNG_pCAL_SUPPORTED)
-png_uint_32
+png_uint_32 PNGAPI
 png_get_pCAL(png_structp png_ptr, png_infop info_ptr,
    png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams,
    png_charp *units, png_charpp *params)
 {
-   if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_pCAL &&
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL)
-      purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
+      && purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
       nparams != NULL && units != NULL && params != NULL)
    {
       png_debug1(1, "in %s retrieval function\n", "pCAL");
@@ -507,14 +626,51 @@ png_get_pCAL(png_structp png_ptr, png_infop info_ptr,
 }
 #endif
 
-#if defined(PNG_READ_pHYs_SUPPORTED)
+#if defined(PNG_sCAL_SUPPORTED)
-png_uint_32
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+png_uint_32 PNGAPI
+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))
+    {
+        *unit = info_ptr->scal_unit;
+        *width = info_ptr->scal_pixel_width;
+        *height = info_ptr->scal_pixel_height;
+        return (PNG_INFO_sCAL);
+    }
+    return(0);
+}
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+png_uint_32 PNGAPI
+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))
+    {
+        *unit = info_ptr->scal_unit;
+        *width = info_ptr->scal_s_width;
+        *height = info_ptr->scal_s_height;
+        return (PNG_INFO_sCAL);
+    }
+    return(0);
+}
+#endif
+#endif
+#endif
+
+#if defined(PNG_pHYs_SUPPORTED)
+png_uint_32 PNGAPI
 png_get_pHYs(png_structp png_ptr, png_infop info_ptr,
    png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
 {
    png_uint_32 retval = 0;
 
-   if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_pHYs)
+   if (png_ptr != NULL && info_ptr != NULL &&
+      (info_ptr->valid & PNG_INFO_pHYs))
    {
       png_debug1(1, "in %s retrieval function\n", "pHYs");
       if (res_x != NULL)
@@ -537,12 +693,12 @@ png_get_pHYs(png_structp png_ptr, png_infop info_ptr,
 }
 #endif
 
-png_uint_32
+png_uint_32 PNGAPI
 png_get_PLTE(png_structp png_ptr, png_infop info_ptr, png_colorp *palette,
    int *num_palette)
 {
-   if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_PLTE &&
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_PLTE)
-       palette != NULL)
+       && palette != NULL)
    {
       png_debug1(1, "in %s retrieval function\n", "PLTE");
       *palette = info_ptr->palette;
@@ -553,12 +709,12 @@ png_get_PLTE(png_structp png_ptr, png_infop info_ptr, png_colorp *palette,
    return (0);
 }
 
-#if defined(PNG_READ_sBIT_SUPPORTED)
+#if defined(PNG_sBIT_SUPPORTED)
-png_uint_32
+png_uint_32 PNGAPI
 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 &&
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT)
-       sig_bit != NULL)
+      && sig_bit != NULL)
    {
       png_debug1(1, "in %s retrieval function\n", "sBIT");
       *sig_bit = &(info_ptr->sig_bit);
@@ -568,8 +724,8 @@ png_get_sBIT(png_structp png_ptr, png_infop info_ptr, png_color_8p *sig_bit)
 }
 #endif
 
-#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
+#if defined(PNG_TEXT_SUPPORTED)
-png_uint_32
+png_uint_32 PNGAPI
 png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr,
    int *num_text)
 {
@@ -584,16 +740,18 @@ png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr,
          *num_text = info_ptr->num_text;
       return ((png_uint_32)info_ptr->num_text);
    }
+   if (num_text != NULL)
+     *num_text = 0;
    return(0);
 }
 #endif
 
-#if defined(PNG_READ_tIME_SUPPORTED)
+#if defined(PNG_tIME_SUPPORTED)
-png_uint_32
+png_uint_32 PNGAPI
 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 &&
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME)
-       mod_time != NULL)
+       && mod_time != NULL)
    {
       png_debug1(1, "in %s retrieval function\n", "tIME");
       *mod_time = &(info_ptr->mod_time);
@@ -603,13 +761,13 @@ png_get_tIME(png_structp png_ptr, png_infop info_ptr, png_timep *mod_time)
 }
 #endif
 
-#if defined(PNG_READ_tRNS_SUPPORTED)
+#if defined(PNG_tRNS_SUPPORTED)
-png_uint_32
+png_uint_32 PNGAPI
 png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
    png_bytep *trans, int *num_trans, png_color_16p *trans_values)
 {
    png_uint_32 retval = 0;
-   if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_tRNS)
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
    {
       png_debug1(1, "in %s retrieval function\n", "tRNS");
       if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
@@ -642,3 +800,128 @@ png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
 }
 #endif
 
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+png_uint_32 PNGAPI
+png_get_unknown_chunks(png_structp png_ptr, png_infop info_ptr,
+             png_unknown_chunkpp unknowns)
+{
+   if (png_ptr != NULL && info_ptr != NULL && unknowns != NULL)
+     *unknowns = info_ptr->unknown_chunks;
+   return ((png_uint_32)info_ptr->unknown_chunks_num);
+}
+#endif
+
+#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
+png_byte PNGAPI
+png_get_rgb_to_gray_status (png_structp png_ptr)
+{
+   return (png_byte)(png_ptr? png_ptr->rgb_to_gray_status : 0);
+}
+#endif
+
+#if defined(PNG_USER_CHUNKS_SUPPORTED)
+png_voidp PNGAPI
+png_get_user_chunk_ptr(png_structp png_ptr)
+{
+   return (png_ptr? png_ptr->user_chunk_ptr : NULL);
+}
+#endif
+
+
+png_uint_32 PNGAPI
+png_get_compression_buffer_size(png_structp png_ptr)
+{
+   return (png_uint_32)(png_ptr? png_ptr->zbuf_size : 0L);
+}
+
+
+#ifndef PNG_1_0_X
+#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
+/* this function was added to libpng 1.2.0 and should exist by default */
+png_uint_32 PNGAPI
+png_get_asm_flags (png_structp png_ptr)
+{
+    return (png_uint_32)(png_ptr? png_ptr->asm_flags : 0L);
+}
+
+/* this function was added to libpng 1.2.0 and should exist by default */
+png_uint_32 PNGAPI
+png_get_asm_flagmask (int flag_select)
+{
+    png_uint_32 settable_asm_flags = 0;
+
+    if (flag_select & PNG_SELECT_READ)
+        settable_asm_flags |=
+          PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  |
+          PNG_ASM_FLAG_MMX_READ_INTERLACE    |
+          PNG_ASM_FLAG_MMX_READ_FILTER_SUB   |
+          PNG_ASM_FLAG_MMX_READ_FILTER_UP    |
+          PNG_ASM_FLAG_MMX_READ_FILTER_AVG   |
+          PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ;
+          /* no non-MMX flags yet */
+
+#if 0
+    /* GRR:  no write-flags yet, either, but someday... */
+    if (flag_select & PNG_SELECT_WRITE)
+        settable_asm_flags |=
+          PNG_ASM_FLAG_MMX_WRITE_ [whatever] ;
+#endif /* 0 */
+
+    return settable_asm_flags;  /* _theoretically_ settable capabilities only */
+}
+#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
+
+
+#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
+    /* GRR:  could add this:   && defined(PNG_MMX_CODE_SUPPORTED) */
+/* this function was added to libpng 1.2.0 */
+png_uint_32 PNGAPI
+png_get_mmx_flagmask (int flag_select, int *compilerID)
+{
+    png_uint_32 settable_mmx_flags = 0;
+
+    if (flag_select & PNG_SELECT_READ)
+        settable_mmx_flags |=
+          PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  |
+          PNG_ASM_FLAG_MMX_READ_INTERLACE    |
+          PNG_ASM_FLAG_MMX_READ_FILTER_SUB   |
+          PNG_ASM_FLAG_MMX_READ_FILTER_UP    |
+          PNG_ASM_FLAG_MMX_READ_FILTER_AVG   |
+          PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ;
+#if 0
+    /* GRR:  no MMX write support yet, but someday... */
+    if (flag_select & PNG_SELECT_WRITE)
+        settable_mmx_flags |=
+          PNG_ASM_FLAG_MMX_WRITE_ [whatever] ;
+#endif /* 0 */
+
+    if (compilerID != NULL) {
+#ifdef PNG_USE_PNGVCRD
+        *compilerID = 1;    /* MSVC */
+#else
+#ifdef PNG_USE_PNGGCCRD
+        *compilerID = 2;    /* gcc/gas */
+#else
+        *compilerID = -1;   /* unknown (i.e., no asm/MMX code compiled) */
+#endif
+#endif
+    }
+
+    return settable_mmx_flags;  /* _theoretically_ settable capabilities only */
+}
+
+/* this function was added to libpng 1.2.0 */
+png_byte PNGAPI
+png_get_mmx_bitdepth_threshold (png_structp png_ptr)
+{
+    return (png_byte)(png_ptr? png_ptr->mmx_bitdepth_threshold : 0);
+}
+
+/* this function was added to libpng 1.2.0 */
+png_uint_32 PNGAPI
+png_get_mmx_rowbytes_threshold (png_structp png_ptr)
+{
+    return (png_uint_32)(png_ptr? png_ptr->mmx_rowbytes_threshold : 0L);
+}
+#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
+#endif /* PNG_1_0_X */

src/png/pngmem.c

@@ -1,40 +1,40 @@
 
 /* pngmem.c - stub functions for memory allocation
  *
- * libpng 1.0.1
+ * libpng 1.2.4 - July 8, 2002
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
- * Copyright (c) 1996, 1997 Andreas Dilger
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * Copyright (c) 1998, Glenn Randers-Pehrson
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- * March 15, 1998
  *
- * This file provides a location for all memory allocation.  Users which
+ * This file provides a location for all memory allocation.  Users who
- * need special memory handling are expected to modify the code in this file
+ * need special memory handling are expected to supply replacement
- * to meet their needs.  See the instructions at each function.
+ * functions for png_malloc() and png_free(), and to use
+ * png_create_read_struct_2() and png_create_write_struct_2() to
+ * identify the replacement functions.
  */
 
 #define PNG_INTERNAL
 #include "png.h"
 
-/* The following "hides" PNG_MALLOC and PNG_FREE thus allowing the pngtest
-   application to put a wrapper on top of them. */
-#ifdef PNGTEST_MEMORY_DEBUG
-#define PNG_MALLOC png_debug_malloc
-#define PNG_FREE   png_debug_free
-#else
-#define PNG_MALLOC png_malloc
-#define PNG_FREE   png_free
-#endif
-
 /* 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 */
 
 /* 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. */
-png_voidp
+png_voidp /* PRIVATE */
 png_create_struct(int type)
 {
+#ifdef PNG_USER_MEM_SUPPORTED
+   return (png_create_struct_2(type, png_malloc_ptr_NULL, png_voidp_NULL));
+}
+
+/* Alternate version of png_create_struct, for use with user-defined malloc. */
+png_voidp /* PRIVATE */
+png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
+{
+#endif /* PNG_USER_MEM_SUPPORTED */
    png_size_t size;
    png_voidp struct_ptr;
 
@@ -43,25 +43,51 @@ png_create_struct(int type)
    else if (type == PNG_STRUCT_PNG)
      size = sizeof(png_struct);
    else
-     return ((png_voidp)NULL);
+     return (png_get_copyright());
 
-   if ((struct_ptr = (png_voidp)farmalloc(size)) != NULL)
+#ifdef PNG_USER_MEM_SUPPORTED
+   if(malloc_fn != NULL)
    {
-      png_memset(struct_ptr, 0, size);
+      png_struct dummy_struct;
+      png_structp png_ptr = &dummy_struct;
+      png_ptr->mem_ptr=mem_ptr;
+      struct_ptr = (*(malloc_fn))(png_ptr, (png_uint_32)size);
    }
-
+   else
+#endif /* PNG_USER_MEM_SUPPORTED */
+      struct_ptr = (png_voidp)farmalloc(size));
+   if (struct_ptr != NULL)
+      png_memset(struct_ptr, 0, size);
    return (struct_ptr);
 }
 
-
 /* Free memory allocated by a png_create_struct() call */
-void
+void /* PRIVATE */
 png_destroy_struct(png_voidp struct_ptr)
 {
+#ifdef PNG_USER_MEM_SUPPORTED
+   png_destroy_struct_2(struct_ptr, png_free_ptr_NULL, png_voidp_NULL);
+}
+
+/* Free memory allocated by a png_create_struct() call */
+void /* PRIVATE */
+png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
+    png_voidp mem_ptr)
+{
+#endif
    if (struct_ptr != NULL)
    {
+#ifdef PNG_USER_MEM_SUPPORTED
+      if(free_fn != NULL)
+      {
+         png_struct dummy_struct;
+         png_structp png_ptr = &dummy_struct;
+         png_ptr->mem_ptr=mem_ptr;
+         (*(free_fn))(png_ptr, struct_ptr);
+         return;
+      }
+#endif /* PNG_USER_MEM_SUPPORTED */
       farfree (struct_ptr);
-      struct_ptr = NULL;
    }
 }
 
@@ -72,7 +98,7 @@ png_destroy_struct(png_voidp struct_ptr)
  * have the ability to do that.
  *
  * Borland seems to have a problem in DOS mode for exactly 64K.
- * It gives you a segment with an offset of 8 (perhaps to store it's
+ * It gives you a segment with an offset of 8 (perhaps to store its
  * memory stuff).  zlib doesn't like this at all, so we have to
  * detect and deal with it.  This code should not be needed in
  * Windows or OS/2 modes, and only in 16 bit mode.  This code has
@@ -84,12 +110,32 @@ png_destroy_struct(png_voidp struct_ptr)
  * result, we would be truncating potentially larger memory requests
  * (which should cause a fatal error) and introducing major problems.
  */
-png_voidp
+
-PNG_MALLOC(png_structp png_ptr, png_uint_32 size)
+png_voidp PNGAPI
+png_malloc(png_structp png_ptr, png_uint_32 size)
 {
    png_voidp ret;
+
    if (png_ptr == NULL || size == 0)
-      return ((png_voidp)NULL);
+      return (NULL);
+
+#ifdef PNG_USER_MEM_SUPPORTED
+   if(png_ptr->malloc_fn != NULL)
+   {
+       ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
+       if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+          png_error(png_ptr, "Out of memory!");
+       return (ret);
+   }
+   else
+       return png_malloc_default(png_ptr, size);
+}
+
+png_voidp PNGAPI
+png_malloc_default(png_structp png_ptr, png_uint_32 size)
+{
+   png_voidp ret;
+#endif /* PNG_USER_MEM_SUPPORTED */
 
 #ifdef PNG_MAX_MALLOC_64K
    if (size > (png_uint_32)65536L)
@@ -116,8 +162,9 @@ PNG_MALLOC(png_structp png_ptr, png_uint_32 size)
                ret = NULL;
             }
 
+            if(png_ptr->zlib_window_bits > 14)
                num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14));
-            if (num_blocks < 1)
+            else
                num_blocks = 1;
             if (png_ptr->zlib_mem_level >= 7)
                num_blocks += (int)(1 << (png_ptr->zlib_mem_level - 7));
@@ -130,12 +177,22 @@ PNG_MALLOC(png_structp png_ptr, png_uint_32 size)
 
             if (table == NULL)
             {
+               if (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
                   png_error(png_ptr, "Out Of Memory."); /* Note "O" and "M" */
+               else
+                  png_warning(png_ptr, "Out Of Memory.");
+               return (NULL);
             }
 
             if ((png_size_t)table & 0xfff0)
             {
-               png_error(png_ptr, "Farmalloc didn't return normalized pointer");
+               if (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+                  png_error(png_ptr,
+                    "Farmalloc didn't return normalized pointer");
+               else
+                  png_warning(png_ptr,
+                    "Farmalloc didn't return normalized pointer");
+               return (NULL);
             }
 
             png_ptr->offset_table = table;
@@ -144,19 +201,23 @@ PNG_MALLOC(png_structp png_ptr, png_uint_32 size)
 
             if (png_ptr->offset_table_ptr == NULL)
             {
-               png_error(png_ptr, "Out Of memory.");
+               if (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+                  png_error(png_ptr, "Out Of memory."); /* Note "O" and "M" */
+               else
+                  png_warning(png_ptr, "Out Of memory.");
+               return (NULL);
             }
 
             hptr = (png_byte huge *)table;
             if ((png_size_t)hptr & 0xf)
             {
                hptr = (png_byte huge *)((long)(hptr) & 0xfffffff0L);
-               hptr += 16L;
+               hptr = hptr + 16L;  /* "hptr += 16L" fails on Turbo C++ 3.0 */
             }
             for (i = 0; i < num_blocks; i++)
             {
                png_ptr->offset_table_ptr[i] = (png_bytep)hptr;
-               hptr += (png_uint_32)65536L;
+               hptr = hptr + (png_uint_32)65536L;  /* "+=" fails on TC++3.0 */
             }
 
             png_ptr->offset_table_number = num_blocks;
@@ -166,7 +227,13 @@ PNG_MALLOC(png_structp png_ptr, png_uint_32 size)
       }
 
       if (png_ptr->offset_table_count >= png_ptr->offset_table_number)
-         png_error(png_ptr, "Out of Memory.");
+      {
+         if (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+            png_error(png_ptr, "Out of Memory."); /* Note "o" and "M" */
+         else
+            png_warning(png_ptr, "Out of Memory.");
+         return (NULL);
+      }
 
       ret = png_ptr->offset_table_ptr[png_ptr->offset_table_count++];
    }
@@ -175,21 +242,38 @@ PNG_MALLOC(png_structp png_ptr, png_uint_32 size)
 
    if (ret == NULL)
    {
+      if (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
          png_error(png_ptr, "Out of memory."); /* Note "o" and "m" */
+      else
+         png_warning(png_ptr, "Out of memory."); /* Note "o" and "m" */
    }
 
    return (ret);
 }
 
-/* free a pointer allocated by PNG_MALLOC().  In the default
+/* 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
+void PNGAPI
-PNG_FREE(png_structp png_ptr, png_voidp ptr)
+png_free(png_structp png_ptr, png_voidp ptr)
 {
    if (png_ptr == NULL || ptr == NULL)
       return;
 
+#ifdef PNG_USER_MEM_SUPPORTED
+   if (png_ptr->free_fn != NULL)
+   {
+      (*(png_ptr->free_fn))(png_ptr, ptr);
+      return;
+   }
+   else png_free_default(png_ptr, ptr);
+}
+
+void PNGAPI
+png_free_default(png_structp png_ptr, png_voidp ptr)
+{
+#endif /* PNG_USER_MEM_SUPPORTED */
+
    if (png_ptr->offset_table != NULL)
    {
       int i;
@@ -215,7 +299,6 @@ PNG_FREE(png_structp png_ptr, png_voidp ptr)
    if (ptr != NULL)
    {
       farfree(ptr);
-      ptr = NULL;
    }
 }
 
@@ -224,9 +307,20 @@ PNG_FREE(png_structp png_ptr, png_voidp ptr)
 /* Allocate memory for a png_struct or a png_info.  The malloc and
    memset can be replaced by a single call to calloc() if this is thought
    to improve performance noticably. */
-png_voidp
+png_voidp /* PRIVATE */
 png_create_struct(int type)
 {
+#ifdef PNG_USER_MEM_SUPPORTED
+   return (png_create_struct_2(type, png_malloc_ptr_NULL, png_voidp_NULL));
+}
+
+/* Allocate memory for a png_struct or a png_info.  The malloc and
+   memset can be replaced by a single call to calloc() if this is thought
+   to improve performance noticably. */
+png_voidp /* PRIVATE */
+png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
+{
+#endif /* PNG_USER_MEM_SUPPORTED */
    png_size_t size;
    png_voidp struct_ptr;
 
@@ -235,7 +329,20 @@ png_create_struct(int type)
    else if (type == PNG_STRUCT_PNG)
       size = sizeof(png_struct);
    else
-      return ((png_voidp)NULL);
+      return (NULL);
+
+#ifdef PNG_USER_MEM_SUPPORTED
+   if(malloc_fn != NULL)
+   {
+      png_struct dummy_struct;
+      png_structp png_ptr = &dummy_struct;
+      png_ptr->mem_ptr=mem_ptr;
+      struct_ptr = (*(malloc_fn))(png_ptr, size);
+      if (struct_ptr != NULL)
+         png_memset(struct_ptr, 0, size);
+      return (struct_ptr);
+   }
+#endif /* PNG_USER_MEM_SUPPORTED */
 
 #if defined(__TURBOC__) && !defined(__FLAT__)
    if ((struct_ptr = (png_voidp)farmalloc(size)) != NULL)
@@ -255,11 +362,31 @@ png_create_struct(int type)
 
 
 /* Free memory allocated by a png_create_struct() call */
-void
+void /* PRIVATE */
 png_destroy_struct(png_voidp struct_ptr)
 {
+#ifdef PNG_USER_MEM_SUPPORTED
+   png_destroy_struct_2(struct_ptr, png_free_ptr_NULL, png_voidp_NULL);
+}
+
+/* Free memory allocated by a png_create_struct() call */
+void /* PRIVATE */
+png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
+    png_voidp mem_ptr)
+{
+#endif /* PNG_USER_MEM_SUPPORTED */
    if (struct_ptr != NULL)
    {
+#ifdef PNG_USER_MEM_SUPPORTED
+      if(free_fn != NULL)
+      {
+         png_struct dummy_struct;
+         png_structp png_ptr = &dummy_struct;
+         png_ptr->mem_ptr=mem_ptr;
+         (*(free_fn))(png_ptr, struct_ptr);
+         return;
+      }
+#endif /* PNG_USER_MEM_SUPPORTED */
 #if defined(__TURBOC__) && !defined(__FLAT__)
       farfree(struct_ptr);
 #else
@@ -272,24 +399,46 @@ png_destroy_struct(png_voidp struct_ptr)
    }
 }
 
-
 /* 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. */
 
-png_voidp
+png_voidp PNGAPI
-PNG_MALLOC(png_structp png_ptr, png_uint_32 size)
+png_malloc(png_structp png_ptr, png_uint_32 size)
 {
    png_voidp ret;
 
    if (png_ptr == NULL || size == 0)
-      return ((png_voidp)NULL);
+      return (NULL);
+
+#ifdef PNG_USER_MEM_SUPPORTED
+   if(png_ptr->malloc_fn != NULL)
+   {
+       ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
+       if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+          png_error(png_ptr, "Out of Memory!");
+       return (ret);
+   }
+   else
+       return (png_malloc_default(png_ptr, size));
+}
+
+png_voidp PNGAPI
+png_malloc_default(png_structp png_ptr, png_uint_32 size)
+{
+   png_voidp ret;
+#endif /* PNG_USER_MEM_SUPPORTED */
 
 #ifdef PNG_MAX_MALLOC_64K
    if (size > (png_uint_32)65536L)
+   {
+      if(png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
          png_error(png_ptr, "Cannot Allocate > 64K");
+      else
+         return NULL;
+   }
 #endif
 
 #if defined(__TURBOC__) && !defined(__FLAT__)
@@ -302,23 +451,36 @@ PNG_MALLOC(png_structp png_ptr, png_uint_32 size)
 # endif
 #endif
 
-   if (ret == NULL)
+   if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
-   {
       png_error(png_ptr, "Out of Memory");
-   }
 
    return (ret);
 }
 
-/* Free a pointer allocated by PNG_MALLOC().  In the default
+/* Free a pointer allocated by png_malloc().  If ptr is NULL, return
-  configuration, png_ptr is not used, but is passed in case it
+   without taking any action. */
-  is needed.  If ptr is NULL, return without taking any action. */
+void PNGAPI
-void
+png_free(png_structp png_ptr, png_voidp ptr)
-PNG_FREE(png_structp png_ptr, png_voidp ptr)
 {
    if (png_ptr == NULL || ptr == NULL)
       return;
 
+#ifdef PNG_USER_MEM_SUPPORTED
+   if (png_ptr->free_fn != NULL)
+   {
+      (*(png_ptr->free_fn))(png_ptr, ptr);
+      return;
+   }
+   else png_free_default(png_ptr, ptr);
+}
+void PNGAPI
+png_free_default(png_structp png_ptr, png_voidp ptr)
+{
+   if (png_ptr == NULL || ptr == NULL)
+      return;
+
+#endif /* PNG_USER_MEM_SUPPORTED */
+
 #if defined(__TURBOC__) && !defined(__FLAT__)
    farfree(ptr);
 #else
@@ -332,7 +494,27 @@ PNG_FREE(png_structp png_ptr, png_voidp ptr)
 
 #endif /* Not Borland DOS special memory handler */
 
-png_voidp
+#if defined(PNG_1_0_X)
+#  define png_malloc_warn png_malloc
+#else
+/* This function was added at libpng version 1.2.3.  The png_malloc_warn()
+ * function will issue a png_warning and return NULL instead of issuing a
+ * png_error, if it fails to allocate the requested memory.
+ */
+png_voidp PNGAPI
+png_malloc_warn(png_structp png_ptr, png_uint_32 size)
+{
+   png_voidp ptr;
+   png_uint_32 save_flags=png_ptr->flags;
+
+   png_ptr->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
+   ptr = (png_voidp)png_malloc((png_structp)png_ptr, size);
+   png_ptr->flags=save_flags;
+   return(ptr);
+}
+#endif
+
+png_voidp PNGAPI
 png_memcpy_check (png_structp png_ptr, png_voidp s1, png_voidp s2,
    png_uint_32 length)
 {
@@ -345,7 +527,7 @@ png_memcpy_check (png_structp png_ptr, png_voidp s1, png_voidp s2,
    return(png_memcpy (s1, s2, size));
 }
 
-png_voidp
+png_voidp PNGAPI
 png_memset_check (png_structp png_ptr, png_voidp s1, int value,
    png_uint_32 length)
 {
@@ -358,3 +540,27 @@ png_memset_check (png_structp png_ptr, png_voidp s1, int value,
    return (png_memset (s1, value, size));
 
 }
+
+#ifdef PNG_USER_MEM_SUPPORTED
+/* This function is called when the application wants to use another method
+ * of allocating and freeing memory.
+ */
+void PNGAPI
+png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr
+  malloc_fn, png_free_ptr free_fn)
+{
+   png_ptr->mem_ptr = mem_ptr;
+   png_ptr->malloc_fn = malloc_fn;
+   png_ptr->free_fn = free_fn;
+}
+
+/* This function returns a pointer to the mem_ptr associated with the user
+ * functions.  The application should free any memory associated with this
+ * pointer before png_write_destroy and png_read_destroy are called.
+ */
+png_voidp PNGAPI
+png_get_mem_ptr(png_structp png_ptr)
+{
+   return ((png_voidp)png_ptr->mem_ptr);
+}
+#endif /* PNG_USER_MEM_SUPPORTED */

src/png/pngrio.c

@@ -1,17 +1,16 @@
 
 /* pngrio.c - functions for data input
  *
- * libpng 1.0.1
+ * libpng 1.2.4 - July 8, 2002
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
- * Copyright (c) 1996, 1997 Andreas Dilger
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * Copyright (c) 1998, Glenn Randers-Pehrson
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- * March 15, 1998
  *
- * This file provides a location for all input.  Users which need
+ * This file provides a location for all input.  Users who need
- * special handling are expected to write a function which has the same
+ * special handling are expected to write a function that has the same
- * arguments as this, and perform a similar function, but possibly has
+ * arguments as this and performs a similar function, but that possibly
- * a different input method.  Note that you shouldn't change this
+ * has a different input method.  Note that you shouldn't change this
  * function, but rather write a replacement function and then make
  * libpng use it at run time with png_set_read_fn(...).
  */
@@ -24,10 +23,10 @@
    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
+void /* PRIVATE */
 png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
-   png_debug1(4,"reading %d bytes\n", length);
+   png_debug1(4,"reading %d bytes\n", (int)length);
    if (png_ptr->read_data_fn != NULL)
       (*(png_ptr->read_data_fn))(png_ptr, data, length);
    else
@@ -35,12 +34,12 @@ png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 }
 
 #if !defined(PNG_NO_STDIO)
-/* This is the function which does the actual reading of data.  If you are
+/* 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
+void PNGAPI
 png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    png_size_t check;
@@ -48,14 +47,17 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
    /* fread() returns 0 on error, so it is OK to store this in a png_size_t
     * instead of an int, which is what fread() actually returns.
     */
+#if defined(_WIN32_WCE)
+   if ( !ReadFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) )
+      check = 0;
+#else
    check = (png_size_t)fread(data, (png_size_t)1, length,
-      (FILE *)png_ptr->io_ptr);
+      (png_FILE_p)png_ptr->io_ptr);
+#endif
 
    if (check != length)
-   {
       png_error(png_ptr, "Read Error");
 }
-}
 #else
 /* this is the model-independent version. Since the standard I/O library
    can't handle far buffers in the medium and small models, we have to copy
@@ -65,19 +67,24 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 #define NEAR_BUF_SIZE 1024
 #define MIN(a,b) (a <= b ? a : b)
 
-static void
+static void /* PRIVATE */
 png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    int check;
    png_byte *n_data;
-   FILE *io_ptr;
+   png_FILE_p io_ptr;
 
    /* Check if data really is near. If so, use usual code. */
    n_data = (png_byte *)CVT_PTR_NOCHECK(data);
-   io_ptr = (FILE *)CVT_PTR(png_ptr->io_ptr);
+   io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
    if ((png_bytep)n_data == data)
    {
+#if defined(_WIN32_WCE)
+      if ( !ReadFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) )
+         check = 0;
+#else
       check = fread(n_data, 1, length, io_ptr);
+#endif
    }
    else
    {
@@ -88,7 +95,12 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
       do
       {
          read = MIN(NEAR_BUF_SIZE, remaining);
+#if defined(_WIN32_WCE)
+         if ( !ReadFile((HANDLE)(io_ptr), buf, read, &err, NULL) )
+            err = 0;
+#else
          err = fread(buf, (png_size_t)1, read, io_ptr);
+#endif
          png_memcpy(data, buf, read); /* copy far buffer to near buffer */
          if(err != read)
             break;
@@ -100,10 +112,8 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
       while (remaining != 0);
    }
    if ((png_uint_32)check != (png_uint_32)length)
-   {
       png_error(png_ptr, "read Error");
 }
-}
 #endif
 #endif
 
@@ -114,13 +124,13 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
    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 which takes as it's
+   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 which is the number of bytes to be read.
+                  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"). */
-void
+void PNGAPI
 png_set_read_fn(png_structp png_ptr, png_voidp io_ptr,
    png_rw_ptr read_data_fn)
 {
@@ -136,10 +146,16 @@ png_set_read_fn(png_structp png_ptr, png_voidp io_ptr,
 #endif
 
    /* It is an error to write to a read device */
+   if (png_ptr->write_data_fn != NULL)
+   {
       png_ptr->write_data_fn = NULL;
+      png_warning(png_ptr,
+         "It's an error to set both read_data_fn and write_data_fn in the ");
+      png_warning(png_ptr,
+         "same structure.  Resetting write_data_fn to NULL.");
+   }
 
 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
    png_ptr->output_flush_fn = NULL;
-#endif /* PNG_WRITE_FLUSH_SUPPORTED */
+#endif
 }
-

src/png/pngtrans.c

@@ -1,20 +1,19 @@
 
 /* pngtrans.c - transforms the data in a row (used by both readers and writers)
  *
- * libpng 1.0.1
+ * libpng 1.2.4 - July 8, 2002
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
- * Copyright (c) 1996, 1997 Andreas Dilger
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * Copyright (c) 1998, Glenn Randers-Pehrson
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- * March 15, 1998
  */
 
 #define PNG_INTERNAL
 #include "png.h"
 
 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
-/* turn on bgr to rgb mapping */
+/* turn on BGR-to-RGB mapping */
-void
+void PNGAPI
 png_set_bgr(png_structp png_ptr)
 {
    png_debug(1, "in png_set_bgr\n");
@@ -24,7 +23,7 @@ png_set_bgr(png_structp png_ptr)
 
 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
 /* turn on 16 bit byte swapping */
-void
+void PNGAPI
 png_set_swap(png_structp png_ptr)
 {
    png_debug(1, "in png_set_swap\n");
@@ -35,7 +34,7 @@ png_set_swap(png_structp png_ptr)
 
 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
 /* turn on pixel packing */
-void
+void PNGAPI
 png_set_packing(png_structp png_ptr)
 {
    png_debug(1, "in png_set_packing\n");
@@ -49,7 +48,7 @@ png_set_packing(png_structp png_ptr)
 
 #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED)
 /* turn on packed pixel swapping */
-void
+void PNGAPI
 png_set_packswap(png_structp png_ptr)
 {
    png_debug(1, "in png_set_packswap\n");
@@ -59,7 +58,7 @@ png_set_packswap(png_structp png_ptr)
 #endif
 
 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
-void
+void PNGAPI
 png_set_shift(png_structp png_ptr, png_color_8p true_bits)
 {
    png_debug(1, "in png_set_shift\n");
@@ -70,7 +69,7 @@ png_set_shift(png_structp png_ptr, png_color_8p true_bits)
 
 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \
     defined(PNG_WRITE_INTERLACING_SUPPORTED)
-int
+int PNGAPI
 png_set_interlace_handling(png_structp png_ptr)
 {
    png_debug(1, "in png_set_interlace handling\n");
@@ -87,10 +86,10 @@ png_set_interlace_handling(png_structp png_ptr)
 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
 /* Add a filler byte on read, or remove a filler or alpha byte on write.
  * The filler type has changed in v0.95 to allow future 2-byte fillers
- * for 48-bit input data, as well as avoiding problems with some compilers
+ * for 48-bit input data, as well as to avoid problems with some compilers
- * which don't like bytes as parameters.
+ * that don't like bytes as parameters.
  */
-void
+void PNGAPI
 png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc)
 {
    png_debug(1, "in png_set_filler\n");
@@ -101,17 +100,29 @@ png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc)
    else
       png_ptr->flags &= ~PNG_FLAG_FILLER_AFTER;
 
-   /* This should probably go in the "do_filler" routine */
+   /* This should probably go in the "do_filler" routine.
-   if (png_ptr->color_type == PNG_COLOR_TYPE_RGB && png_ptr->bit_depth == 8)
+    * I attempted to do that in libpng-1.0.1a but that caused problems
+    * so I restored it in libpng-1.0.2a
+   */
+
+   if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
    {
       png_ptr->usr_channels = 4;
    }
+
+   /* Also I added this in libpng-1.0.2a (what happens when we expand
+    * a less-than-8-bit grayscale to GA? */
+
+   if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY && png_ptr->bit_depth >= 8)
+   {
+      png_ptr->usr_channels = 2;
+   }
 }
 #endif
 
 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
     defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
-void
+void PNGAPI
 png_set_swap_alpha(png_structp png_ptr)
 {
    png_debug(1, "in png_set_swap_alpha\n");
@@ -121,7 +132,7 @@ png_set_swap_alpha(png_structp png_ptr)
 
 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
     defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
-void
+void PNGAPI
 png_set_invert_alpha(png_structp png_ptr)
 {
    png_debug(1, "in png_set_invert_alpha\n");
@@ -130,30 +141,62 @@ png_set_invert_alpha(png_structp png_ptr)
 #endif
 
 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
-void
+void PNGAPI
 png_set_invert_mono(png_structp png_ptr)
 {
    png_debug(1, "in png_set_invert_mono\n");
    png_ptr->transformations |= PNG_INVERT_MONO;
 }
 
-/* invert monocrome grayscale data */
+/* invert monochrome grayscale data */
-void
+void /* PRIVATE */
 png_do_invert(png_row_infop row_info, png_bytep row)
 {
    png_debug(1, "in png_do_invert\n");
-   if (row_info->bit_depth == 1 &&
+  /* This test removed from libpng version 1.0.13 and 1.2.0:
+   *   if (row_info->bit_depth == 1 &&
+   */
 #if defined(PNG_USELESS_TESTS_SUPPORTED)
-       row != NULL && row_info != NULL &&
+   if (row == NULL || row_info == NULL)
+     return;
 #endif
-       row_info->color_type == PNG_COLOR_TYPE_GRAY)
+   if (row_info->color_type == PNG_COLOR_TYPE_GRAY)
    {
-      png_bytep rp;
+      png_bytep rp = row;
       png_uint_32 i;
+      png_uint_32 istop = row_info->rowbytes;
 
-      for (i = 0, rp = row; i < row_info->rowbytes; i++, rp++)
+      for (i = 0; i < istop; i++)
       {
          *rp = (png_byte)(~(*rp));
+         rp++;
+      }
+   }
+   else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
+      row_info->bit_depth == 8)
+   {
+      png_bytep rp = row;
+      png_uint_32 i;
+      png_uint_32 istop = row_info->rowbytes;
+
+      for (i = 0; i < istop; i+=2)
+      {
+         *rp = (png_byte)(~(*rp));
+         rp+=2;
+      }
+   }
+   else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
+      row_info->bit_depth == 16)
+   {
+      png_bytep rp = row;
+      png_uint_32 i;
+      png_uint_32 istop = row_info->rowbytes;
+
+      for (i = 0; i < istop; i+=4)
+      {
+         *rp = (png_byte)(~(*rp));
+         *(rp+1) = (png_byte)(~(*(rp+1)));
+         rp+=4;
       }
    }
 }
@@ -161,7 +204,7 @@ png_do_invert(png_row_infop row_info, png_bytep row)
 
 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
 /* swaps byte order on 16 bit depth images */
-void
+void /* PRIVATE */
 png_do_swap(png_row_infop row_info, png_bytep row)
 {
    png_debug(1, "in png_do_swap\n");
@@ -171,15 +214,13 @@ png_do_swap(png_row_infop row_info, png_bytep row)
 #endif
        row_info->bit_depth == 16)
    {
-      png_bytep rp;
+      png_bytep rp = row;
-      png_byte t;
       png_uint_32 i;
+      png_uint_32 istop= row_info->width * row_info->channels;
 
-      for (i = 0, rp = row;
+      for (i = 0; i < istop; i++, rp += 2)
-         i < row_info->width * row_info->channels;
-         i++, rp += 2)
       {
-         t = *rp;
+         png_byte t = *rp;
          *rp = *(rp + 1);
          *(rp + 1) = t;
       }
@@ -294,7 +335,7 @@ static png_byte fourbppswaptable[256] = {
 };
 
 /* swaps pixel packing order within bytes */
-void
+void /* PRIVATE */
 png_do_packswap(png_row_infop row_info, png_bytep row)
 {
    png_debug(1, "in png_do_packswap\n");
@@ -326,7 +367,7 @@ 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) */
-void
+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");
@@ -338,6 +379,11 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
       if (row_info->color_type == PNG_COLOR_TYPE_RGB ||
           row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
 */
+      png_bytep sp=row;
+      png_bytep dp=row;
+      png_uint_32 row_width=row_info->width;
+      png_uint_32 i;
+
       if (row_info->channels == 4)
       {
          if (row_info->bit_depth == 8)
@@ -345,10 +391,8 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
             /* This converts from RGBX or RGBA to RGB */
             if (flags & PNG_FLAG_FILLER_AFTER)
             {
-               png_bytep sp, dp;
+               dp+=3; sp+=4;
-               png_uint_32 i;
+               for (i = 1; i < row_width; i++)
-
-               for (i = 1, sp = row + 4, dp = row + 3; i < row_info->width; i++)
                {
                   *dp++ = *sp++;
                   *dp++ = *sp++;
@@ -359,10 +403,7 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
             /* This converts from XRGB or ARGB to RGB */
             else
             {
-               png_bytep sp, dp;
+               for (i = 0; i < row_width; i++)
-               png_uint_32 i;
-
-               for (i = 0, sp = row, dp = row; i < row_info->width; i++)
                {
                   sp++;
                   *dp++ = *sp++;
@@ -371,23 +412,22 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
                }
             }
             row_info->pixel_depth = 24;
-            row_info->rowbytes = row_info->width * 3;
+            row_info->rowbytes = row_width * 3;
          }
          else /* if (row_info->bit_depth == 16) */
          {
             if (flags & PNG_FLAG_FILLER_AFTER)
             {
-               png_bytep sp, dp;
-               png_uint_32 i;
-
                /* This converts from RRGGBBXX or RRGGBBAA to RRGGBB */
-               for (i = 1, sp = row + 8, dp = row + 6; i < row_info->width; i++)
+               sp += 8; dp += 6;
+               for (i = 1; i < row_width; i++)
                {
-                  /* This could be (although memcpy is probably slower):
+                  /* This could be (although png_memcpy is probably slower):
                   png_memcpy(dp, sp, 6);
                   sp += 8;
                   dp += 6;
                   */
+
                   *dp++ = *sp++;
                   *dp++ = *sp++;
                   *dp++ = *sp++;
@@ -399,17 +439,16 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
             }
             else
             {
-               png_bytep sp, dp;
-               png_uint_32 i;
-
                /* This converts from XXRRGGBB or AARRGGBB to RRGGBB */
-               for (i = 0, sp = row + 2, dp = row; i < row_info->width; i++)
+               for (i = 0; i < row_width; i++)
                {
-                  /* This could be (although memcpy is probably slower):
+                  /* This could be (although png_memcpy is probably slower):
                   png_memcpy(dp, sp, 6);
                   sp += 8;
                   dp += 6;
                   */
+
+                  sp+=2;
                   *dp++ = *sp++;
                   *dp++ = *sp++;
                   *dp++ = *sp++;
@@ -419,9 +458,10 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
                }
             }
             row_info->pixel_depth = 48;
-            row_info->rowbytes = row_info->width * 6;
+            row_info->rowbytes = row_width * 6;
          }
          row_info->channels = 3;
+         row_info->color_type &= ~PNG_COLOR_MASK_ALPHA;
       }
 /*
       else if (row_info->color_type == PNG_COLOR_TYPE_GRAY ||
@@ -434,10 +474,7 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
             /* This converts from GX or GA to G */
             if (flags & PNG_FLAG_FILLER_AFTER)
             {
-               png_bytep sp, dp;
+               for (i = 0; i < row_width; i++)
-               png_uint_32 i;
-
-               for (i = 1, sp = row + 2, dp = row + 1; i < row_info->width; i++)
                {
                   *dp++ = *sp++;
                   sp++;
@@ -446,27 +483,22 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
             /* This converts from XG or AG to G */
             else
             {
-               png_bytep sp, dp;
+               for (i = 0; i < row_width; i++)
-               png_uint_32 i;
-
-               for (i = 0, sp = row, dp = row; i < row_info->width; i++)
                {
                   sp++;
                   *dp++ = *sp++;
                }
             }
             row_info->pixel_depth = 8;
-            row_info->rowbytes = row_info->width;
+            row_info->rowbytes = row_width;
          }
          else /* if (row_info->bit_depth == 16) */
          {
             if (flags & PNG_FLAG_FILLER_AFTER)
             {
-               png_bytep sp, dp;
-               png_uint_32 i;
-
                /* This converts from GGXX or GGAA to GG */
-               for (i = 1, sp = row + 4, dp = row + 2; i < row_info->width; i++)
+               sp += 4; dp += 2;
+               for (i = 1; i < row_width; i++)
                {
                   *dp++ = *sp++;
                   *dp++ = *sp++;
@@ -475,11 +507,8 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
             }
             else
             {
-               png_bytep sp, dp;
-               png_uint_32 i;
-
                /* This converts from XXGG or AAGG to GG */
-               for (i = 0, sp = row, dp = row; i < row_info->width; i++)
+               for (i = 0; i < row_width; i++)
                {
                   sp += 2;
                   *dp++ = *sp++;
@@ -487,9 +516,10 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
                }
             }
             row_info->pixel_depth = 16;
-            row_info->rowbytes = row_info->width * 2;
+            row_info->rowbytes = row_width * 2;
          }
          row_info->channels = 1;
+         row_info->color_type &= ~PNG_COLOR_MASK_ALPHA;
       }
    }
 }
@@ -497,7 +527,7 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
 
 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
 /* swaps red and blue bytes within a pixel */
-void
+void /* PRIVATE */
 png_do_bgr(png_row_infop row_info, png_bytep row)
 {
    png_debug(1, "in png_do_bgr\n");
@@ -507,17 +537,17 @@ png_do_bgr(png_row_infop row_info, png_bytep row)
 #endif
        (row_info->color_type & PNG_COLOR_MASK_COLOR))
    {
+      png_uint_32 row_width = row_info->width;
       if (row_info->bit_depth == 8)
       {
          if (row_info->color_type == PNG_COLOR_TYPE_RGB)
          {
             png_bytep rp;
-            png_byte save;
             png_uint_32 i;
 
-            for (i = 0, rp = row; i < row_info->width; i++, rp += 3)
+            for (i = 0, rp = row; i < row_width; i++, rp += 3)
             {
-               save = *rp;
+               png_byte save = *rp;
                *rp = *(rp + 2);
                *(rp + 2) = save;
             }
@@ -525,12 +555,11 @@ png_do_bgr(png_row_infop row_info, png_bytep row)
          else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
          {
             png_bytep rp;
-            png_byte save;
             png_uint_32 i;
 
-            for (i = 0, rp = row; i < row_info->width; i++, rp += 4)
+            for (i = 0, rp = row; i < row_width; i++, rp += 4)
             {
-               save = *rp;
+               png_byte save = *rp;
                *rp = *(rp + 2);
                *(rp + 2) = save;
             }
@@ -541,33 +570,31 @@ png_do_bgr(png_row_infop row_info, png_bytep row)
          if (row_info->color_type == PNG_COLOR_TYPE_RGB)
          {
             png_bytep rp;
-            png_byte save[2];
             png_uint_32 i;
 
-            for (i = 0, rp = row; i < row_info->width; i++, rp += 6)
+            for (i = 0, rp = row; i < row_width; i++, rp += 6)
             {
-               save[0] = *rp;
+               png_byte save = *rp;
-               save[1] = *(rp + 1);
                *rp = *(rp + 4);
+               *(rp + 4) = save;
+               save = *(rp + 1);
                *(rp + 1) = *(rp + 5);
-               *(rp + 4) = save[0];
+               *(rp + 5) = save;
-               *(rp + 5) = save[1];
             }
          }
          else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
          {
             png_bytep rp;
-            png_byte save[2];
             png_uint_32 i;
 
-            for (i = 0, rp = row; i < row_info->width; i++, rp += 8)
+            for (i = 0, rp = row; i < row_width; i++, rp += 8)
             {
-               save[0] = *rp;
+               png_byte save = *rp;
-               save[1] = *(rp + 1);
                *rp = *(rp + 4);
+               *(rp + 4) = save;
+               save = *(rp + 1);
                *(rp + 1) = *(rp + 5);
-               *(rp + 4) = save[0];
+               *(rp + 5) = save;
-               *(rp + 5) = save[1];
             }
          }
       }
@@ -575,3 +602,39 @@ 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)
+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 defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
+   png_ptr->user_transform_ptr = user_transform_ptr;
+   png_ptr->user_transform_depth = (png_byte)user_transform_depth;
+   png_ptr->user_transform_channels = (png_byte)user_transform_channels;
+#else
+   if(user_transform_ptr || user_transform_depth || user_transform_channels)
+      png_warning(png_ptr,
+        "This version of libpng does not support user transform info");
+#endif
+}
+#endif
+
+/* This function returns a pointer to the user_transform_ptr associated with
+ * the user transform functions.  The application should free any memory
+ * associated with this pointer before png_write_destroy and png_read_destroy
+ * are called.
+ */
+png_voidp PNGAPI
+png_get_user_transform_ptr(png_structp png_ptr)
+{
+#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
+   return ((png_voidp)png_ptr->user_transform_ptr);
+#else
+   if(png_ptr)
+     return (NULL);
+   return (NULL);
+#endif
+}

src/png/pngwio.c

@@ -1,31 +1,31 @@
 
 /* pngwio.c - functions for data output
  *
- * libpng 1.0.1
+ * libpng 1.2.4 - July 8, 2002
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
- * Copyright (c) 1996, 1997 Andreas Dilger
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * Copyright (c) 1998, Glenn Randers-Pehrson
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- * March 15, 1998
  *
- * This file provides a location for all output.  Users which need
+ * This file provides a location for all output.  Users who need
- * special handling are expected to write functions which have the same
+ * special handling are expected to write functions that have the same
- * arguments as these, and perform similar functions, but possibly use
+ * arguments as these and perform similar functions, but that possibly
- * different output methods.  Note that you shouldn't change these
+ * use different output methods.  Note that you shouldn't change these
  * functions, but rather write replacement functions and then change
  * them at run time with png_set_write_fn(...).
  */
 
 #define PNG_INTERNAL
 #include "png.h"
+#ifdef PNG_WRITE_SUPPORTED
 
 /* Write the data to whatever output you are using.  The default routine
    writes to a file pointer.  Note that this routine sometimes gets called
    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 then 64K on a 16 bit machine.  */
+   to write more than 64K on a 16 bit machine.  */
 
-void
+void /* PRIVATE */
 png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    if (png_ptr->write_data_fn != NULL )
@@ -35,22 +35,25 @@ png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 }
 
 #if !defined(PNG_NO_STDIO)
-/* This is the function which does the actual writing of data.  If you are
+/* 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. */
 #ifndef USE_FAR_KEYWORD
-static void
+void PNGAPI
 png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    png_uint_32 check;
 
-   check = fwrite(data, 1, length, (FILE *)(png_ptr->io_ptr));
+#if defined(_WIN32_WCE)
+   if ( !WriteFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) )
+      check = 0;
+#else
+   check = fwrite(data, 1, length, (png_FILE_p)(png_ptr->io_ptr));
+#endif
    if (check != length)
-   {
       png_error(png_ptr, "Write Error");
 }
-}
 #else
 /* this is the model-independent version. Since the standard I/O library
    can't handle far buffers in the medium and small models, we have to copy
@@ -60,19 +63,24 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 #define NEAR_BUF_SIZE 1024
 #define MIN(a,b) (a <= b ? a : b)
 
-static void
+void PNGAPI
 png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    png_uint_32 check;
    png_byte *near_data;  /* Needs to be "png_byte *" instead of "png_bytep" */
-   FILE *io_ptr;
+   png_FILE_p io_ptr;
 
    /* Check if data really is near. If so, use usual code. */
    near_data = (png_byte *)CVT_PTR_NOCHECK(data);
-   io_ptr = (FILE *)CVT_PTR(png_ptr->io_ptr);
+   io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
    if ((png_bytep)near_data == data)
    {
+#if defined(_WIN32_WCE)
+      if ( !WriteFile(io_ptr, near_data, length, &check, NULL) )
+         check = 0;
+#else
       check = fwrite(near_data, 1, length, io_ptr);
+#endif
    }
    else
    {
@@ -84,7 +92,12 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
       {
          written = MIN(NEAR_BUF_SIZE, remaining);
          png_memcpy(buf, data, written); /* copy far buffer to near buffer */
+#if defined(_WIN32_WCE)
+         if ( !WriteFile(io_ptr, buf, written, &err, NULL) )
+            err = 0;
+#else
          err = fwrite(buf, 1, written, io_ptr);
+#endif
          if (err != written)
             break;
          else
@@ -95,10 +108,8 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
       while (remaining != 0);
    }
    if (check != length)
-   {
       png_error(png_ptr, "Write Error");
 }
-}
 
 #endif
 #endif
@@ -107,7 +118,7 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
    to disk).  After png_flush is called, there should be no data pending
    writing in any buffers. */
 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
-void
+void /* PRIVATE */
 png_flush(png_structp png_ptr)
 {
    if (png_ptr->output_flush_fn != NULL)
@@ -115,13 +126,15 @@ png_flush(png_structp png_ptr)
 }
 
 #if !defined(PNG_NO_STDIO)
-static void
+void PNGAPI
 png_default_flush(png_structp png_ptr)
 {
-   FILE *io_ptr;
+#if !defined(_WIN32_WCE)
-   io_ptr = (FILE *)CVT_PTR((png_ptr->io_ptr));
+   png_FILE_p io_ptr;
+   io_ptr = (png_FILE_p)CVT_PTR((png_ptr->io_ptr));
    if (io_ptr != NULL)
       fflush(io_ptr);
+#endif
 }
 #endif
 #endif
@@ -133,13 +146,13 @@ png_default_flush(png_structp png_ptr)
    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 which takes as its
+   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 which is
+                   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 which takes as its
+   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
@@ -148,7 +161,7 @@ png_default_flush(png_structp png_ptr)
                    PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile
                    time, output_flush_fn will be ignored, although it must be
                    supplied for compatibility. */
-void
+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)
 {
@@ -175,7 +188,14 @@ png_set_write_fn(png_structp png_ptr, png_voidp io_ptr,
 #endif /* PNG_WRITE_FLUSH_SUPPORTED */
 
    /* It is an error to read while writing a png file */
+   if (png_ptr->read_data_fn != NULL)
+   {
       png_ptr->read_data_fn = NULL;
+      png_warning(png_ptr,
+         "Attempted to set both read_data_fn and write_data_fn in");
+      png_warning(png_ptr,
+         "the same structure.  Resetting read_data_fn to NULL.");
+   }
 }
 
 #if defined(USE_FAR_KEYWORD)
@@ -205,3 +225,4 @@ void *png_far_to_near(png_structp png_ptr,png_voidp ptr, int check)
 }
 #   endif
 #   endif
+#endif /* PNG_WRITE_SUPPORTED */

src/png/pngwtran.c

@@ -1,25 +1,28 @@
 
 /* pngwtran.c - transforms the data in a row for PNG writers
  *
- * libpng 1.0.1
+ * libpng 1.2.4 - July 8, 2002
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
- * Copyright (c) 1996, 1997 Andreas Dilger
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * Copyright (c) 1998, Glenn Randers-Pehrson
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- * March 15, 1998
  */
 
 #define PNG_INTERNAL
 #include "png.h"
+#ifdef PNG_WRITE_SUPPORTED
 
-/* Transform the data according to the users wishes.  The order of
+/* Transform the data according to the user's wishes.  The order of
  * transformations is significant.
  */
-void
+void /* PRIVATE */
 png_do_write_transformations(png_structp png_ptr)
 {
    png_debug(1, "in png_do_write_transformations\n");
 
+   if (png_ptr == NULL)
+      return;
+
 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
    if (png_ptr->transformations & PNG_USER_TRANSFORM)
       if(png_ptr->write_user_transform_fn != NULL)
@@ -48,15 +51,15 @@ png_do_write_transformations(png_structp png_ptr)
       png_do_pack(&(png_ptr->row_info), png_ptr->row_buf + 1,
          (png_uint_32)png_ptr->bit_depth);
 #endif
+#if defined(PNG_WRITE_SWAP_SUPPORTED)
+   if (png_ptr->transformations & PNG_SWAP_BYTES)
+      png_do_swap(&(png_ptr->row_info), png_ptr->row_buf + 1);
+#endif
 #if defined(PNG_WRITE_SHIFT_SUPPORTED)
    if (png_ptr->transformations & PNG_SHIFT)
       png_do_shift(&(png_ptr->row_info), png_ptr->row_buf + 1,
          &(png_ptr->shift));
 #endif
-#if defined(PNG_WRITE_SWAP_SUPPORTED)
-   if (png_ptr->transformations & PNG_SWAP_BYTES)
-      png_do_swap(&(png_ptr->row_info), png_ptr->row_buf + 1);
-#endif
 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
    if (png_ptr->transformations & PNG_INVERT_ALPHA)
       png_do_write_invert_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1);
@@ -80,7 +83,7 @@ png_do_write_transformations(png_structp png_ptr)
  * row_info bit depth should be 8 (one pixel per byte).  The channels
  * should be 1 (this only happens on grayscale and paletted images).
  */
-void
+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");
@@ -97,12 +100,14 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
             png_bytep sp, dp;
             int mask, v;
             png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
 
             sp = row;
             dp = row;
             mask = 0x80;
             v = 0;
-            for (i = 0; i < row_info->width; i++)
+
+            for (i = 0; i < row_width; i++)
             {
                if (*sp != 0)
                   v |= mask;
@@ -126,16 +131,17 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
             png_bytep sp, dp;
             int shift, v;
             png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
 
             sp = row;
             dp = row;
             shift = 6;
             v = 0;
-            for (i = 0; i < row_info->width; i++)
+            for (i = 0; i < row_width; i++)
             {
                png_byte value;
 
-               value = (png_byte)(*sp & 0x3);
+               value = (png_byte)(*sp & 0x03);
                v |= (value << shift);
                if (shift == 0)
                {
@@ -157,16 +163,17 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
             png_bytep sp, dp;
             int shift, v;
             png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
 
             sp = row;
             dp = row;
             shift = 4;
             v = 0;
-            for (i = 0; i < row_info->width; i++)
+            for (i = 0; i < row_width; i++)
             {
                png_byte value;
 
-               value = (png_byte)(*sp & 0xf);
+               value = (png_byte)(*sp & 0x0f);
                v |= (value << shift);
 
                if (shift == 0)
@@ -202,7 +209,7 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
  * would pass 3 as bit_depth, and this routine would translate the
  * data to 0 to 15.
  */
-void
+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");
@@ -214,9 +221,8 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
       row_info->color_type != PNG_COLOR_TYPE_PALETTE)
    {
       int shift_start[4], shift_dec[4];
-      png_uint_32 channels;
+      int channels = 0;
 
-      channels = 0;
       if (row_info->color_type & PNG_COLOR_MASK_COLOR)
       {
          shift_start[channels] = row_info->bit_depth - bit_depth->red;
@@ -245,9 +251,10 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
       /* with low row depths, could only be grayscale, so one channel */
       if (row_info->bit_depth < 8)
       {
-         png_bytep bp;
+         png_bytep bp = row;
          png_uint_32 i;
          png_byte mask;
+         png_uint_32 row_bytes = row_info->rowbytes;
 
          if (bit_depth->gray == 1 && row_info->bit_depth == 2)
             mask = 0x55;
@@ -256,7 +263,7 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
          else
             mask = 0xff;
 
-         for (bp = row, i = 0; i < row_info->rowbytes; i++, bp++)
+         for (i = 0; i < row_bytes; i++, bp++)
          {
             png_uint_16 v;
             int j;
@@ -274,17 +281,16 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
       }
       else if (row_info->bit_depth == 8)
       {
-         png_bytep bp;
+         png_bytep bp = row;
          png_uint_32 i;
+         png_uint_32 istop = channels * row_info->width;
 
-         for (bp = row, i = 0; i < row_info->width; i++)
+         for (i = 0; i < istop; i++, bp++)
          {
-            png_uint_32 c;
 
-            for (c = 0; c < channels; c++, bp++)
-            {
             png_uint_16 v;
             int j;
+            int c = (int)(i%channels);
 
             v = *bp;
             *bp = 0;
@@ -297,22 +303,19 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
             }
          }
       }
-      }
       else
       {
          png_bytep bp;
          png_uint_32 i;
+         png_uint_32 istop = channels * row_info->width;
 
-         for (bp = row, i = 0; i < row_info->width * row_info->channels; i++)
+         for (bp = row, i = 0; i < istop; i++)
-         {
-            png_uint_32 c;
-
-            for (c = 0; c < channels; c++, bp += 2)
          {
+            int c = (int)(i%channels);
             png_uint_16 value, v;
             int j;
 
-               v = ((png_uint_16)(*bp) << 8) + *(bp + 1);
+            v = (png_uint_16)(((png_uint_16)(*bp) << 8) + *(bp + 1));
             value = 0;
             for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c])
             {
@@ -321,9 +324,8 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
                else
                   value |= (png_uint_16)((v >> (-j)) & (png_uint_16)0xffff);
             }
-               *bp = (png_byte)(value >> 8);
+            *bp++ = (png_byte)(value >> 8);
-               *(bp + 1) = (png_byte)(value & 0xff);
+            *bp++ = (png_byte)(value & 0xff);
-            }
          }
       }
    }
@@ -331,7 +333,7 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
 #endif
 
 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
-void
+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");
@@ -345,12 +347,11 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
          if (row_info->bit_depth == 8)
          {
             png_bytep sp, dp;
-            png_byte save;
             png_uint_32 i;
-
+            png_uint_32 row_width = row_info->width;
-            for (i = 0, sp = dp = row; i < row_info->width; i++)
+            for (i = 0, sp = dp = row; i < row_width; i++)
             {
-               save = *(sp++);
+               png_byte save = *(sp++);
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
@@ -361,11 +362,12 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
          else
          {
             png_bytep sp, dp;
-            png_byte save[2];
             png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
 
-            for (i = 0, sp = dp = row; i < row_info->width; i++)
+            for (i = 0, sp = dp = row; i < row_width; i++)
             {
+               png_byte save[2];
                save[0] = *(sp++);
                save[1] = *(sp++);
                *(dp++) = *(sp++);
@@ -385,12 +387,12 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
          if (row_info->bit_depth == 8)
          {
             png_bytep sp, dp;
-            png_byte save;
             png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
 
-            for (i = 0, sp = dp = row; i < row_info->width; i++)
+            for (i = 0, sp = dp = row; i < row_width; i++)
             {
-               save = *(sp++);
+               png_byte save = *(sp++);
                *(dp++) = *(sp++);
                *(dp++) = save;
             }
@@ -399,11 +401,12 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
          else
          {
             png_bytep sp, dp;
-            png_byte save[2];
             png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
 
-            for (i = 0, sp = dp = row; i < row_info->width; i++)
+            for (i = 0, sp = dp = row; i < row_width; i++)
             {
+               png_byte save[2];
                save[0] = *(sp++);
                save[1] = *(sp++);
                *(dp++) = *(sp++);
@@ -418,7 +421,7 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
 #endif
 
 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
-void
+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");
@@ -433,13 +436,13 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
          {
             png_bytep sp, dp;
             png_uint_32 i;
-
+            png_uint_32 row_width = row_info->width;
-            for (i = 0, sp = dp = row; i < row_info->width; i++)
+            for (i = 0, sp = dp = row; i < row_width; i++)
             {
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
-               *(dp++) = 255 - *(sp++);
+               *(dp++) = (png_byte)(255 - *(sp++));
             }
          }
          /* This inverts the alpha channel in RRGGBBAA */
@@ -447,8 +450,9 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
          {
             png_bytep sp, dp;
             png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
 
-            for (i = 0, sp = dp = row; i < row_info->width; i++)
+            for (i = 0, sp = dp = row; i < row_width; i++)
             {
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
@@ -456,8 +460,8 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
-               *(dp++) = 255 - *(sp++);
+               *(dp++) = (png_byte)(255 - *(sp++));
-               *(dp++) = 255 - *(sp++);
+               *(dp++) = (png_byte)(255 - *(sp++));
             }
          }
       }
@@ -468,11 +472,12 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
          {
             png_bytep sp, dp;
             png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
 
-            for (i = 0, sp = dp = row; i < row_info->width; i++)
+            for (i = 0, sp = dp = row; i < row_width; i++)
             {
                *(dp++) = *(sp++);
-               *(dp++) = 255 - *(sp++);
+               *(dp++) = (png_byte)(255 - *(sp++));
             }
          }
          /* This inverts the alpha channel in GGAA */
@@ -480,16 +485,79 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
          {
             png_bytep sp, dp;
             png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
 
-            for (i = 0, sp = dp = row; i < row_info->width; i++)
+            for (i = 0, sp = dp = row; i < row_width; i++)
             {
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
-               *(dp++) = 255 - *(sp++);
+               *(dp++) = (png_byte)(255 - *(sp++));
-               *(dp++) = 255 - *(sp++);
+               *(dp++) = (png_byte)(255 - *(sp++));
             }
          }
       }
    }
 }
 #endif
+
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+/* undoes intrapixel differencing  */
+void /* PRIVATE */
+png_do_write_intrapixel(png_row_infop row_info, png_bytep row)
+{
+   png_debug(1, "in png_do_write_intrapixel\n");
+   if (
+#if defined(PNG_USELESS_TESTS_SUPPORTED)
+       row != NULL && row_info != NULL &&
+#endif
+       (row_info->color_type & PNG_COLOR_MASK_COLOR))
+   {
+      int bytes_per_pixel;
+      png_uint_32 row_width = row_info->width;
+      if (row_info->bit_depth == 8)
+      {
+         png_bytep rp;
+         png_uint_32 i;
+
+         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+            bytes_per_pixel = 3;
+         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+            bytes_per_pixel = 4;
+         else
+            return;
+
+         for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
+         {
+            *(rp)   = (png_byte)((*rp     - *(rp+1))&0xff);
+            *(rp+2) = (png_byte)((*(rp+2) - *(rp+1))&0xff);
+         }
+      }
+      else if (row_info->bit_depth == 16)
+      {
+         png_bytep rp;
+         png_uint_32 i;
+
+         if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+            bytes_per_pixel = 6;
+         else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+            bytes_per_pixel = 8;
+         else
+            return;
+
+         for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
+         {
+            png_uint_32 s0=*(rp  )<<8 | *(rp+1);
+            png_uint_32 s1=*(rp+2)<<8 | *(rp+3);
+            png_uint_32 s2=*(rp+4)<<8 | *(rp+5);
+            png_uint_32 red=(s0-s1)&0xffff;
+            png_uint_32 blue=(s2-s1)&0xffff;
+            *(rp  ) = (png_byte)((red>>8)&0xff);
+            *(rp+1) = (png_byte)(red&0xff);
+            *(rp+4) = (png_byte)((blue>>8)&0xff);
+            *(rp+5) = (png_byte)(blue&0xff);
+         }
+      }
+   }
+}
+#endif /* PNG_MNG_FEATURES_SUPPORTED */
+#endif /* PNG_WRITE_SUPPORTED */

src/png/scripts/makefile.bor

@@ -1,39 +1,38 @@
 # Makefile for libpng
-# Borland C++ 4.5 (Note: All modules are compiled in C mode)
+# 16-bit Borland C++ (Note: All modules are compiled in C mode)
-# Will work with C++ 4.02 also
 # To build the library, do:
-#       "make -fmakefile.bor -DMODEL=m"
+#       "make -fmakefile.bor -DMODEL=c"
 # or:   "make -fmakefile.bor -DMODEL=l"
 #
-# ------------- Borland C++ 4.5 -------------
+# ------------ Borland C++ ------------
 
 ### Absolutely necessary for this makefile to work
 .AUTODEPEND
 
-## Useful user options
+## Where zlib.h, zconf.h and zlib_MODEL.lib are
+ZLIB_DIR=..\zlib
 
-# Usually defined in builtins.mak or the environment
-# Currently unused.
-!ifndef BCROOT
-BCROOT=N:\BC45
-!endif
 
-# Where zlib.h and zconf.h and zlib.lib are
+## Compiler, linker and lib stuff
-ZLIB_PATH=..\zlib
+CC=bcc
+LD=bcc
+LIB=tlib
 
 !ifndef MODEL
 MODEL=l
 !endif
 
+MODEL_ARG=-m$(MODEL)
+
 #TARGET_CPU=3
 # 2 = 286, 3 = 386, etc.
 !ifndef TARGET_CPU
 TARGET_CPU=2
 !endif
 
-
+# Use this if you don't want Borland's fancy exception handling
-# Use this if you don't want Borland's fancy exception handling.
+# (for Borland C++ 4.0 or later)
-NOEHLIB=noeh$(MODEL).lib
+#NOEHLIB=noeh$(MODEL).lib
 
 !ifdef DEBUG
 CDEBUG=-v
@@ -49,59 +48,50 @@ CDEBUG=$(CDEBUG) -N
 LDEBUG=$(LDEBUG) -N
 !endif
 
-
+# -X- turn on dependency generation in the object file
-## Compiler, linker, and lib stuff
+# -w  set all warnings on
-CC=bcc
-LD=bcc
-LIB=tlib
-
-MODELARG=-m$(MODEL)
-
-# -X- turns on dependency generation in the object file
-# -w  sets all warnings on
 # -O2 optimize for speed
 # -Z  global optimization
-CFLAGS=-O2 -Z -X- -w -I$(ZLIB_PATH) -$(TARGET_CPU) $(MODELARG) $(CDEBUG)
+CFLAGS=-O2 -Z -X- -w -I$(ZLIB_DIR) -$(TARGET_CPU) $(MODEL_ARG) $(CDEBUG)
 
 # -M  generate map file
-LDFLAGS=-M $(LDEBUG)
+LDFLAGS=-M -L$(ZLIB_DIR) $(MODEL_ARG) $(LDEBUG)
 
-O=obj
 
-## variables
+## Variables
 OBJS = \
- png.$(O) \
+	png.obj \
- pngerror.$(O) \
+	pngerror.obj \
- pngmem.$(O) \
+	pngget.obj \
- pngpread.$(O) \
+	pngmem.obj \
- pngset.$(O) \
+	pngpread.obj \
- pngget.$(O) \
+	pngread.obj \
- pngread.$(O) \
+	pngrio.obj \
- pngrio.$(O) \
+	pngrtran.obj \
- pngrtran.$(O) \
+	pngrutil.obj \
- pngrutil.$(O) \
+	pngset.obj \
- pngtrans.$(O) \
+	pngtrans.obj \
- pngwrite.$(O) \
+	pngwio.obj \
- pngwtran.$(O) \
+	pngwrite.obj \
- pngwio.$(O) \
+	pngwtran.obj \
- pngwutil.$(O)
+	pngwutil.obj
 
 LIBOBJS = \
- +png.$(O) \
+	+png.obj \
- +pngerror.$(O) \
+	+pngerror.obj \
- +pngmem.$(O) \
+	+pngget.obj \
- +pngpread.$(O) \
+	+pngmem.obj \
- +pngread.$(O) \
+	+pngpread.obj \
- +pngset.$(O) \
+	+pngread.obj \
- +pngget.$(O) \
+	+pngrio.obj \
- +pngrio.$(O) \
+	+pngrtran.obj \
- +pngrtran.$(O) \
+	+pngrutil.obj \
- +pngrutil.$(O) \
+	+pngset.obj \
- +pngtrans.$(O) \
+	+pngtrans.obj \
- +pngwrite.$(O) \
+	+pngwio.obj \
- +pngwtran.$(O) \
+	+pngwrite.obj \
- +pngwio.$(O)
+	+pngwtran.obj \
- +pngwutil.$(O)
+	+pngwutil.obj
 
 LIBNAME=libpng$(MODEL).lib
 
@@ -113,32 +103,34 @@ LIBNAME=libpng$(MODEL).lib
 	$(CC) $(CFLAGS) -c {$*.c }
 
 .c.exe:
-	$(CC) $(CFLAGS) $(LDFLAGS) $*.c
+	$(CC) $(CFLAGS) $(LDFLAGS) $*.c $(LIBNAME) zlib_$(MODEL).lib $(NOEHLIB)
 
 
 ## Major targets
+all: libpng pngtest
+
 libpng: $(LIBNAME)
 
 pngtest: pngtest$(MODEL).exe
 
-test:
+test: pngtest$(MODEL).exe
 	pngtest$(MODEL)
 
 
 ## Minor Targets
 
 png.obj: png.c
-pngset.obj: pngset.c
+pngerror.obj: pngerror.c
 pngget.obj: pngget.c
-pngread.obj: pngread.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
-pngerror.obj: pngerror.c
+pngset.obj: pngset.c
-pngmem.obj: pngmem.c
-pngrio.obj: pngrio.c
-pngwio.obj: pngwio.c
 pngtrans.obj: pngtrans.c
+pngwio.obj: pngwio.c
 pngwrite.obj: pngwrite.c
 pngwtran.obj: pngwtran.c
 pngwutil.obj: pngwutil.c
@@ -155,14 +147,16 @@ pngtest$(MODEL).obj: pngtest.c
 	$(CC) $(CFLAGS) -opngtest$(MODEL) -c pngtest.c
 
 pngtest$(MODEL).exe: pngtest$(MODEL).obj
-	$(CC) $(MODELARG) $(LDFLAGS) -L$(ZLIB_PATH) pngtest$(MODEL).obj $(LIBNAME) zlib$(MODEL).lib $(NOEHLIB)
+	$(LD) $(LDFLAGS) pngtest$(MODEL).obj $(LIBNAME) zlib_$(MODEL).lib $(NOEHLIB)
 
 
 # Clean up anything else you want
 clean:
 	-del *.obj
+	-del *.exe
 	-del *.lib
 	-del *.lst
+	-del *.map
 
 
 # End of makefile for libpng

src/png/scripts/makefile.dec

@@ -1,13 +1,41 @@
 # makefile for libpng on DEC Alpha Unix
+# Copyright (C) 2000-2002 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
 # For conditions of distribution and use, see copyright notice in png.h
 
+# where make install puts libpng.a and png.h
+prefix=/usr/local
+INCPATH=$(prefix)/include
+LIBPATH=$(prefix)/lib
+MANPATH=$(prefix)/man
+BINPATH=$(prefix)/bin
+
+# override DESTDIR= on the make install command line to easily support
+# installing into a temporary location.  Example:
+#
+#    make install DESTDIR=/tmp/build/libpng
+#
+# If you're going to install into a temporary location
+# via DESTDIR, $(DESTDIR)$(prefix) must already exist before
+# you execute make install.
+DESTDIR=
+
+DB=$(DESTDIR)$(BINPATH)
+DI=$(DESTDIR)$(INCPATH)
+DL=$(DESTDIR)$(LIBPATH)
+DM=$(DESTDIR)$(MANPATH)
+
 # Where the zlib library and include files are located
 #ZLIBLIB=/usr/local/lib
 #ZLIBINC=/usr/local/include
 ZLIBLIB=../zlib
 ZLIBINC=../zlib
 
+PNGMAJ = 0
+PNGMIN = 1.2.4
+PNGVER = $(PNGMAJ).$(PNGMIN)
+LIBNAME = libpng12
+
 CC=cc
 CFLAGS=-std -w1 -I$(ZLIBINC) -O # -g -DPNG_DEBUG=1
 LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm
@@ -15,37 +43,118 @@ LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm
 #RANLIB=echo
 RANLIB=ranlib
 
-# where make install puts libpng.a and png.h
-prefix=/usr/local
-
 OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
 	pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
 	pngwtran.o pngmem.o pngerror.o pngpread.o
 
-all: libpng.a pngtest
+all: $(LIBNAME).so libpng.a pngtest libpng.pc libpng-config
 
 libpng.a: $(OBJS)
 	ar rc $@  $(OBJS)
 	$(RANLIB) $@
 
+libpng.pc:
+	cat scripts/libpng.pc.in | sed -e s\!@PREFIX@!$(prefix)! > libpng.pc
+
+libpng-config:
+	( cat scripts/libpng-config-head.in; \
+	echo prefix=\"$(prefix)\"; \
+	echo cppflags=\"-I$(INCPATH)/$(LIBNAME)\"; \
+	echo cflags=\"-std\"; \
+	echo ldflags=\"-L$(LIBPATH)\"; \
+	echo libs=\"-lpng12 -lz -lm\"; \
+	cat scripts/libpng-config-body.in ) > libpng-config
+	chmod +x libpng-config
+
+$(LIBNAME).so: $(LIBNAME).so.$(PNGMAJ)
+	ln -f -s $(LIBNAME).so.$(PNGMAJ) $(LIBNAME).so
+
+$(LIBNAME).so.$(PNGMAJ): $(LIBNAME).so.$(PNGVER)
+	ln -f -s $(LIBNAME).so.$(PNGVER) $(LIBNAME).so.$(PNGMAJ)
+
+$(LIBNAME).so.$(PNGVER): $(OBJS)
+	$(CC) -shared -o $@ $(OBJS) -L$(ZLIBLIB)
+	-soname $(LIBNAME).so.$(PNGMAJ) -lz -lm
+
 pngtest: pngtest.o libpng.a
 	$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)
 
 test: pngtest
 	./pngtest
 
-install: libpng.a
+install-headers: png.h pngconf.h
-	-@mkdir $(prefix)/include
+	-@if [ ! -d $(DI) ]; then mkdir $(DI); fi
-	-@mkdir $(prefix)/lib
+	-@if [ ! -d $(DI)/$(LIBNAME) ]; then mkdir $(DI)/$(LIBNAME); fi
-	cp png.h $(prefix)/include
+	cp png.h pngconf.h $(DI)/$(LIBNAME)
-	cp pngconf.h $(prefix)/include
+	chmod 644 $(DI)/$(LIBNAME)/png.h $(DI)/$(LIBNAME)/pngconf.h
-	chmod 644 $(prefix)/include/png.h
+	-@/bin/rm -f $(DI)/png.h $(DI)/pngconf.h
-	chmod 644 $(prefix)/include/pngconf.h
+	-@/bin/rm -f $(DI)/libpng
-	cp libpng.a $(prefix)/lib
+	(cd $(DI); ln -sf $(LIBNAME) libpng; ln -sf $(LIBNAME)/* .)
-	chmod 644 $(prefix)/lib/libpng.a
+
+install-static: install-headers libpng.a
+	-@if [ ! -d $(DL) ]; then mkdir $(DL); fi
+	cp libpng.a $(DL)/$(LIBNAME).a
+	chmod 644 $(DL)/$(LIBNAME).a
+	-@/bin/rm -f $(DL)/libpng.a
+	(cd $(DL); ln -sf $(LIBNAME).a libpng.a)
+
+install-shared: install-headers $(LIBNAME).so.$(PNGVER) libpng.pc
+	-@if [ ! -d $(DL) ]; then mkdir $(DL); fi
+	-@/bin/rm -f $(DL)/$(LIBNAME).so.$(PNGMAJ)* $(DL)/$(LIBNAME).so
+	-@/bin/rm -f $(DL)/libpng.so
+	-@/bin/rm -f $(DL)/libpng.so.3
+	-@/bin/rm -f $(DL)/libpng.so.3.*
+	cp $(LIBNAME).so.$(PNGVER) $(DL)
+	chmod 755 $(DL)/$(LIBNAME).so.$(PNGVER)
+	(cd $(DL); \
+	ln -sf $(LIBNAME).so.$(PNGVER) libpng.so; \
+	ln -sf $(LIBNAME).so.$(PNGVER) libpng.so.3; \
+	ln -sf $(LIBNAME).so.$(PNGVER) libpng.so.3.$(PNGMIN); \
+	ln -sf $(LIBNAME).so.$(PNGVER) $(LIBNAME).so.$(PNGMAJ); \
+	ln -sf $(LIBNAME).so.$(PNGMAJ) $(LIBNAME).so)
+	-@if [ ! -d $(DL)/pkgconfig ]; then mkdir $(DL)/pkgconfig; fi
+	-@/bin/rm -f $(DL)/pkgconfig/$(LIBNAME).pc
+	-@/bin/rm -f $(DL)/pkgconfig/libpng.pc
+	cp libpng.pc $(DL)/pkgconfig/$(LIBNAME).pc
+	chmod 644 $(DL)/pkgconfig/$(LIBNAME).pc
+	(cd $(DL)/pkgconfig; ln -sf $(LIBNAME).pc libpng.pc)
+
+install-man: libpng.3 libpngpf.3 png.5
+	-@if [ ! -d $(DM) ]; then mkdir $(DM); fi
+	-@if [ ! -d $(DM)/man3 ]; then mkdir $(DM)/man3; fi
+	-@/bin/rm -f $(DM)/man3/libpng.3
+	-@/bin/rm -f $(DM)/man3/libpngpf.3
+	cp libpng.3 $(DM)/man3
+	cp libpngpf.3 $(DM)/man3
+	-@if [ ! -d $(DM)/man5 ]; then mkdir $(DM)/man5; fi
+	-@/bin/rm -f $(DM)/man5/png.5
+	cp png.5 $(DM)/man5
+
+install-config: libpng-config
+	-@if [ ! -d $(DB) ]; then mkdir $(DB); fi
+	-@/bin/rm -f $(DB)/libpng-config
+	-@/bin/rm -f $(DB)/$(LIBNAME)-config
+	cp libpng-config $(DB)/$(LIBNAME)-config
+	chmod 755 $(DB)/$(LIBNAME)-config
+	(cd $(DB); ln -sf $(LIBNAME)-config libpng-config)
+
+install: install-static install-shared install-man install-config
+
+# If you installed in $(DESTDIR), test-installed won't work until you
+# move the library to its final location.
+
+test-installed:
+	echo
+	echo Testing installed dynamic shared library.
+	$(CC) -std -w1 -I$(ZLIBINC) \
+	   `$(BINPATH)/libpng12-config --cppflags --cflags` pngtest.c \
+	   -L$(ZLIBLIB) -R$(ZLIBLIB) \
+	   -o pngtesti `$(BINPATH)/libpng12-config --ldflags --libs`
+	./pngtesti pngtest.png
 
 clean:
-	rm -f *.o libpng.a pngtest pngout.png
+	/bin/rm -f *.o libpng.a pngtest pngtesti pngout.png libpng.pc \
+	libpng-config $(LIBNAME).so $(LIBNAME).so.$(PNGMAJ)*
 
 # DO NOT DELETE THIS LINE -- make depend depends on it.
 

src/png/scripts/makefile.dj2

@@ -1,17 +1,20 @@
 # DJGPP (DOS gcc) 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
 
+# where make install will put libpng.a and png.h
+#prefix=/usr/local
+prefix=.
+INCPATH=$(prefix)/include
+LIBPATH=$(prefix)/lib
+
 CC=gcc
 CFLAGS=-I../zlib -O
 LDFLAGS=-L. -L../zlib/ -lpng -lz -lm
 
 RANLIB=ranlib
 
-# where make install puts libpng.a and png.h
-#prefix=/usr/local
-prefix=.
-
 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

src/png/scripts/makefile.knr

@@ -1,7 +1,28 @@
 # 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
 
+# This makefile requires the file ansi2knr.c, which you can get
+# from the Ghostscript ftp site at ftp://ftp.cs.wisc.edu/ghost/
+# If you have libjpeg, you probably already have ansi2knr.c in the jpeg
+# source distribution.
+
+# where make install puts libpng.a and png.h
+prefix=/usr/local
+INCPATH=$(prefix)/include
+LIBPATH=$(prefix)/lib
+
+# override DESTDIR= on the make install command line to easily support
+# installing into a temporary location.  Example:
+#
+#    make install DESTDIR=/tmp/build/libpng
+#
+# If you're going to install into a temporary location
+# via DESTDIR, $(DESTDIR)$(prefix) must already exist before
+# you execute make install.
+DESTDIR=
+
 CC=cc
 CFLAGS=-I../zlib -O
 LDFLAGS=-L. -L../zlib/ -lpng -lz -lm
@@ -11,9 +32,6 @@ ANSI2KNRFLAGS=
 RANLIB=ranlib
 #RANLIB=echo
 
-# where make install puts libpng.a and png.h
-prefix=/usr/local
-
 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
@@ -41,18 +59,26 @@ test: pngtest
 	./pngtest
 
 install: libpng.a
-	-@mkdir $(prefix)/include
+	-@mkdir $(DESTDIR)$(INCPATH)
-	-@mkdir $(prefix)/lib
+	-@mkdir $(DESTDIR)$(INCPATH)/libpng
-	cp png.h $(prefix)/include
+	-@mkdir $(DESTDIR)$(LIBPATH)
-	cp pngconf.h $(prefix)/include
+	-@rm -f $(DESTDIR)$(INCPATH)/png.h
-	chmod 644 $(prefix)/include/png.h
+	-@rm -f $(DESTDIR)$(INCPATH)/pngconf.h
-	chmod 644 $(prefix)/include/pngconf.h
+	cp png.h $(DESTDIR)$(INCPATH)/libpng
-	cp libpng.a $(prefix)/lib
+	cp pngconf.h $(DESTDIR)$(INCPATH)/libpng
-	chmod 644 $(prefix)/lib/libpng.a
+	chmod 644 $(DESTDIR)$(INCPATH)/libpng/png.h
+	chmod 644 $(DESTDIR)$(INCPATH)/libpng/pngconf.h
+	(cd $(DESTDIR)$(INCPATH); ln -f -s libpng/* .)
+	cp libpng.a $(DESTDIR)$(LIBPATH)
+	chmod 644 $(DESTDIR)$(LIBPATH)/libpng.a
 
 clean:
 	rm -f *.o libpng.a pngtest pngout.png ansi2knr
 
+DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
+writelock:
+	chmod a-w *.[ch35] $(DOCS) scripts/*
+
 # DO NOT DELETE THIS LINE -- make depend depends on it.
 
 png.o: png.h pngconf.h

src/png/scripts/makefile.msc

@@ -3,9 +3,9 @@
 # For conditions of distribution and use, see copyright notice in png.h
 # Assumes that zlib.lib, zconf.h, and zlib.h have been copied to ..\zlib
 
-# ------------- Microsoft C 5.1 and later -------------
+# -------- Microsoft C 5.1 and later, does not use assembler code --------
-MODEL=-AL
+MODEL=L
-CFLAGS=-Oait -Gs -nologo -W3 $(MODEL) -I..\zlib
+CFLAGS=-Oait -Gs -nologo -W3 -A$(MODEL) -I..\zlib
 #-Ox generates bad code with MSC 5.1
 CC=cl
 LD=link

src/png/scripts/makefile.sgi

@@ -1,8 +1,21 @@
-# makefile for libpng
+# makefile for libpng.a and libpng12.so, SGI IRIX with 'cc'
+# Copyright (C) 2001-2002 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
 # For conditions of distribution and use, see copyright notice in png.h
 
+LIBNAME=libpng12
+PNGMAJ = 0
+PNGMIN = 1.2.4
+PNGVER = $(PNGMAJ).$(PNGMIN)
+
+# Where make install puts libpng.a, libpng12.so, and libpng12/png.h
+# Prefix must be a full pathname.
+
+prefix=/usr/local
+
 # Where the zlib library and include files are located
+#ZLIBLIB=/usr/local/lib32
+#ZLIBINC=/usr/local/include
 #ZLIBLIB=/usr/local/lib
 #ZLIBINC=/usr/local/include
 ZLIBLIB=../zlib
@@ -10,43 +23,164 @@ ZLIBINC=../zlib
 
 CC=cc
 
-CFLAGS=-I$(ZLIBINC) -O -fullwarn # -g -DPNG_DEBUG=1
+# ABI can be blank to use default for your system, -32, -o32, -n32, or -64
-LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm
+# See "man abi".  zlib must be built with the same ABI.
+ABI=
+
+WARNMORE=-fullwarn
+# Note: -KPIC is the default anyhow
+#CFLAGS= $(ABI) -I$(ZLIBINC) -O $(WARNMORE) -KPIC -DPNG_USE_PNGGCCRD # -g -DPNG_DEBUG=5
+CFLAGS=$(ABI) -I$(ZLIBINC) -O $(WARNMORE) -DPNG_USE_PNGGCCRD -DPNG_NO_ASSEMBLER_CODE
+LDFLAGS_A=$(ABI) -L. -L$(ZLIBLIB) -lpng12 -lz -lm
+LDFLAGS=$(ABI) -L. -L$(ZLIBLIB) -lpng -lz -lm
+LDSHARED=cc $(ABI) -shared -soname $(LIBNAME).so.$(PNGMAJ)
+# See "man dso" for info about shared objects
 
 RANLIB=echo
 #RANLIB=ranlib
 
-# where make install puts libpng.a and png.h
+INCPATH=$(prefix)/include
-prefix=/usr/local
+LIBPATH=$(prefix)/lib
+#LIBPATH=$(prefix)/lib32
+MANPATH=$(prefix)/man
+BINPATH=$(prefix)/bin
 
-OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
+# override DESTDIR= on the make install command line to easily support
+# installing into a temporary location.  Example:
+#
+#    make install DESTDIR=/tmp/build/libpng
+#
+# If you're going to install into a temporary location
+# via DESTDIR, $(DESTDIR)$(prefix) must already exist before
+# you execute make install.
+DESTDIR=
+
+DB=$(DESTDIR)$(BINPATH)
+DI=$(DESTDIR)$(INCPATH)
+DL=$(DESTDIR)$(LIBPATH)
+DM=$(DESTDIR)$(MANPATH)
+
+OBJS = pnggccrd.o png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
 	pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
 	pngwtran.o pngmem.o pngerror.o pngpread.o
 
-all: libpng.a pngtest
+all: libpng.a pngtest shared libpng.pc libpng-config
 
 libpng.a: $(OBJS)
 	ar rc $@ $(OBJS)
 	$(RANLIB) $@
 
+shared: $(LIBNAME).so.$(PNGVER)
+
+libpng.pc:
+	cat scripts/libpng.pc.in | sed -e s\!@PREFIX@!$(prefix)! > libpng.pc
+
+libpng-config:
+	( cat scripts/libpng-config-head.in; \
+	echo prefix=\"$(prefix)\"; \
+	echo cppflags=\"-I$(INCPATH)/$(LIBNAME) -DPNG_USE_PNGGCCRD \
+		-DPNG_NO_ASSEMBLER_CODE\"; \
+	echo cflags=\"$(ABI)\"; \
+	echo ldflags=\"-L$(LIBPATH) -rpath $(LIBPATH) \"; \
+	echo libs=\"-lpng12 -lz -lm\"; \
+	cat scripts/libpng-config-body.in ) > libpng-config
+	chmod +x libpng-config
+
+$(LIBNAME).so: $(LIBNAME).so.$(PNGMAJ)
+	ln -sf $(LIBNAME).so.$(PNGMAJ) $(LIBNAME).so
+
+$(LIBNAME).so.$(PNGMAJ): $(LIBNAME).so.$(PNGVER)
+	ln -sf $(LIBNAME).so.$(PNGVER) $(LIBNAME).so.$(PNGMAJ)
+
+$(LIBNAME).so.$(PNGVER): $(OBJS)
+	$(LDSHARED) -o $@ $(OBJS)
+	rm -f $(LIBNAME).so $(LIBNAME).so.$(PNGMAJ)
+
 pngtest: pngtest.o libpng.a
 	$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)
 
 test: pngtest
+	echo
+	echo Testing local static library.
 	./pngtest
 
-install: libpng.a
+install-headers: png.h pngconf.h
-	-@mkdir $(prefix)/include
+	-@if [ ! -d $(DI) ]; then mkdir $(DI); fi
-	-@mkdir $(prefix)/lib
+	-@if [ ! -d $(DI)/$(LIBNAME) ]; then mkdir $(DI)/$(LIBNAME); fi
-	cp png.h $(prefix)/include
+	cp png.h pngconf.h $(DI)/$(LIBNAME)
-	cp pngconf.h $(prefix)/include
+	chmod 644 $(DI)/$(LIBNAME)/png.h $(DI)/$(LIBNAME)/pngconf.h
-	chmod 644 $(prefix)/include/png.h
+	-@/bin/rm -f $(DI)/png.h $(DI)/pngconf.h
-	chmod 644 $(prefix)/include/pngconf.h
+	-@/bin/rm -f $(DI)/libpng
-	cp libpng.a $(prefix)/lib
+	(cd $(DI); ln -sf $(LIBNAME) libpng; ln -sf $(LIBNAME)/* .)
-	chmod 644 $(prefix)/lib/libpng.a
+
+install-static: install-headers libpng.a
+	-@if [ ! -d $(DL) ]; then mkdir $(DL); fi
+	cp libpng.a $(DL)/$(LIBNAME).a
+	chmod 644 $(DL)/$(LIBNAME).a
+	-@/bin/rm -f $(DL)/libpng.a
+	(cd $(DL); ln -sf $(LIBNAME).a libpng.a)
+
+install-shared: install-headers $(LIBNAME).so.$(PNGVER) libpng.pc
+	-@if [ ! -d $(DL) ]; then mkdir $(DL); fi
+	-@/bin/rm -f $(DL)/$(LIBNAME).so.$(PNGMAJ)* $(DL)/$(LIBNAME).so
+	-@/bin/rm -f $(DL)/libpng.so
+	-@/bin/rm -f $(DL)/libpng.so.3
+	-@/bin/rm -f $(DL)/libpng.so.3.*
+	cp $(LIBNAME).so.$(PNGVER) $(DL)
+	chmod 755 $(DL)/$(LIBNAME).so.$(PNGVER)
+	(cd $(DL); \
+	ln -sf $(LIBNAME).so.$(PNGVER) libpng.so; \
+	ln -sf $(LIBNAME).so.$(PNGVER) libpng.so.3; \
+	ln -sf $(LIBNAME).so.$(PNGVER) libpng.so.3.$(PNGMIN); \
+	ln -sf $(LIBNAME).so.$(PNGVER) $(LIBNAME).so.$(PNGMAJ); \
+	ln -sf $(LIBNAME).so.$(PNGMAJ) $(LIBNAME).so)
+	-@if [ ! -d $(DL)/pkgconfig ]; then mkdir $(DL)/pkgconfig; fi
+	-@/bin/rm -f $(DL)/pkgconfig/$(LIBNAME).pc
+	-@/bin/rm -f $(DL)/pkgconfig/libpng.pc
+	cp libpng.pc $(DL)/pkgconfig/$(LIBNAME).pc
+	chmod 644 $(DL)/pkgconfig/$(LIBNAME).pc
+	(cd $(DL)/pkgconfig; ln -sf $(LIBNAME).pc libpng.pc)
+
+install-man: libpng.3 libpngpf.3 png.5
+	-@if [ ! -d $(DM) ]; then mkdir $(DM); fi
+	-@if [ ! -d $(DM)/man3 ]; then mkdir $(DM)/man3; fi
+	-@/bin/rm -f $(DM)/man3/libpng.3
+	-@/bin/rm -f $(DM)/man3/libpngpf.3
+	cp libpng.3 $(DM)/man3
+	cp libpngpf.3 $(DM)/man3
+	-@if [ ! -d $(DM)/man5 ]; then mkdir $(DM)/man5; fi
+	-@/bin/rm -f $(DM)/man5/png.5
+	cp png.5 $(DM)/man5
+
+install-config: libpng-config
+	-@if [ ! -d $(DB) ]; then mkdir $(DB); fi
+	-@/bin/rm -f $(DB)/libpng-config
+	-@/bin/rm -f $(DB)/$(LIBNAME)-config
+	cp libpng-config $(DB)/$(LIBNAME)-config
+	chmod 755 $(DB)/$(LIBNAME)-config
+	(cd $(DB); ln -sf $(LIBNAME)-config libpng-config)
+
+install: install-static install-shared install-man install-config
+
+# If you installed in $(DESTDIR), test-installed won't work until you
+# move the library to its final location.
+
+test-installed:
+	echo
+	echo Testing installed dynamic shared library.
+	$(CC) -I$(ZLIBINC) \
+	   `$(BINPATH)/libpng12-config --cppflags --cflags` pngtest.c \
+	   -L$(ZLIBLIB) -rpath $(ZLIBLIB) \
+	   -o pngtesti `$(BINPATH)/libpng12-config --ldflags --libs`
+	./pngtesti pngtest.png
 
 clean:
-	rm -f *.o libpng.a pngtest pngout.png
+	rm -f *.o libpng.a pngtest pngtesti pngout.png libpng.pc libpng-config \
+	$(LIBNAME).so $(LIBNAME).so.$(PNGMAJ)* so_locations
+
+DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
+writelock:
+	chmod a-w *.[ch35] $(DOCS) scripts/*
 
 # DO NOT DELETE THIS LINE -- make depend depends on it.
 
@@ -66,4 +200,5 @@ pngwrite.o: png.h pngconf.h
 pngwtran.o: png.h pngconf.h
 pngwutil.o: png.h pngconf.h
 pngpread.o: png.h pngconf.h
+pnggccrd.o: png.h pngconf.h
 

src/png/scripts/makefile.std

@@ -1,7 +1,23 @@
 # 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
 
+# where make install puts libpng.a and png.h
+prefix=/usr/local
+INCPATH=$(prefix)/include
+LIBPATH=$(prefix)/lib
+
+# override DESTDIR= on the make install command line to easily support
+# installing into a temporary location.  Example:
+#
+#    make install DESTDIR=/tmp/build/libpng
+#
+# If you're going to install into a temporary location
+# via DESTDIR, $(DESTDIR)$(prefix) must already exist before
+# you execute make install.
+DESTDIR=
+
 # Where the zlib library and include files are located
 #ZLIBLIB=/usr/local/lib
 #ZLIBINC=/usr/local/include
@@ -9,15 +25,12 @@ ZLIBLIB=../zlib
 ZLIBINC=../zlib
 
 CC=cc
-CFLAGS=-I$(ZLIBINC) -O # -g -DPNG_DEBUG=1
+CFLAGS=-I$(ZLIBINC) -O # -g -DPNG_DEBUG=5
 LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm
 
 #RANLIB=echo
 RANLIB=ranlib
 
-# where make install puts libpng.a and png.h
-prefix=/usr/local
-
 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
@@ -35,18 +48,26 @@ test: pngtest
 	./pngtest
 
 install: libpng.a
-	-@mkdir $(prefix)/include
+	-@mkdir $(DESTDIR)$(INCPATH)
-	-@mkdir $(prefix)/lib
+	-@mkdir $(DESTDIR)$(INCPATH)/libpng
-	cp png.h $(prefix)/include
+	-@mkdir $(DESTDIR)$(LIBPATH)
-	cp pngconf.h $(prefix)/include
+	-@rm -f $(DESTDIR)$(INCPATH)/png.h
-	chmod 644 $(prefix)/include/png.h
+	-@rm -f $(DESTDIR)$(INCPATH)/pngconf.h
-	chmod 644 $(prefix)/include/pngconf.h
+	cp png.h $(DESTDIR)$(INCPATH)/libpng
-	cp libpng.a $(prefix)/lib
+	cp pngconf.h $(DESTDIR)$(INCPATH)/libpng
-	chmod 644 $(prefix)/lib/libpng.a
+	chmod 644 $(DESTDIR)$(INCPATH)/libpng/png.h
+	chmod 644 $(DESTDIR)$(INCPATH)/libpng/pngconf.h
+	(cd $(DESTDIR)$(INCPATH); ln -f -s libpng/* .)
+	cp libpng.a $(DESTDIR)$(LIBPATH)
+	chmod 644 $(DESTDIR)$(LIBPATH)/libpng.a
 
 clean:
 	rm -f *.o libpng.a pngtest pngout.png
 
+DOCS = ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO
+writelock:
+	chmod a-w *.[ch35] $(DOCS) scripts/*
+
 # DO NOT DELETE THIS LINE -- make depend depends on it.
 
 png.o: png.h pngconf.h

src/png/scripts/makefile.tc3

@@ -1,15 +1,17 @@
 # Makefile for libpng
-# TurboC++ 3.0 (Note: All modules are compiled in C mode)
+# TurboC/C++ (Note: All modules are compiled in C mode)
 
 # To use, do "make -fmakefile.tc3"
 
-# ------------- Turbo C++ 3.0 -------------
+# ----- Turbo C 3.00 (can be modified to work with earlier versions) -----
-MODEL=-ml
+
-CFLAGS=-O2 -Z $(MODEL) -I..\zlib
+MODEL=l
+CFLAGS=-O2 -Z -m$(MODEL) -I..\zlib
+#CFLAGS=-D_NO_PROTO -O2 -Z -m$(MODEL) -I..\zlib  # Turbo C older than 3.00
 CC=tcc
 LD=tcc
 LIB=tlib
-LDFLAGS=$(MODEL) -L..\zlib
+LDFLAGS=-m$(MODEL) -L..\zlib
 O=.obj
 E=.exe
 
@@ -21,7 +23,12 @@ OBJSL1 = +png$(O) +pngset$(O) +pngget$(O) +pngrutil$(O) +pngtrans$(O)
 OBJSL2 = +pngwutil$(O) +pngmem$(O) +pngpread$(O) +pngread$(O) +pngerror$(O)
 OBJSL3 = +pngwrite$(O) +pngrtran$(O) +pngwtran$(O) +pngrio$(O) +pngwio$(O)
 
-all: libpng.lib pngtest.exe
+all: libpng$(MODEL).lib pngtest$(E)
+
+pngtest: pngtest$(E)
+
+test: pngtest$(E)
+	pngtest$(E)
 
 png$(O): png.h pngconf.h
 		  $(CC) -c $(CFLAGS) $*.c
@@ -71,12 +78,12 @@ pngwtran$(O): png.h pngconf.h
 pngwutil$(O): png.h pngconf.h
 	$(CC) -c $(CFLAGS) $*.c
 
-libpng.lib: $(OBJS1) $(OBJS2) $(OBJS3)
+libpng$(MODEL).lib: $(OBJS1) $(OBJS2) $(OBJS3)
-        $(LIB) libpng +$(OBJSL1)
+	$(LIB) libpng$(MODEL) +$(OBJSL1)
-        $(LIB) libpng +$(OBJSL2)
+	$(LIB) libpng$(MODEL) +$(OBJSL2)
-        $(LIB) libpng +$(OBJSL3)
+	$(LIB) libpng$(MODEL) +$(OBJSL3)
 
-pngtest$(E): pngtest$(O) libpng.lib
+pngtest$(E): pngtest$(O) libpng$(MODEL).lib
-        $(CC) $(LDFLAGS) pngtest.obj libpng.lib zlib.lib
+	$(LD) $(LDFLAGS) pngtest.obj libpng$(MODEL).lib zlib_$(MODEL).lib
 
 # End of makefile for libpng

src/png/scripts/makevms.com

@@ -1,6 +1,25 @@
 $! make libpng under VMS
 $!
 $!
+$! Check for MMK/MMS
+$!
+$! This procedure accepts one parameter (contrib), which causes it to build
+$! the programs from the contrib directory instead of libpng.
+$!
+$ p1 = f$edit(p1,"UPCASE")
+$ if p1 .eqs. "CONTRIB"
+$ then
+$   set def [.contrib.gregbook]
+$   @makevms
+$   set def [-.pngminus]
+$   @makevms
+$   set def [--]
+$   exit
+$ endif
+$ Make = ""
+$ If F$Search ("Sys$System:MMS.EXE") .nes. "" Then Make = "MMS"
+$ If F$Type (MMK) .eqs. "STRING" Then Make = "MMK"
+$!
 $! Look for the compiler used
 $!
 $ zlibsrc = "[-.zlib]"
@@ -28,10 +47,10 @@ $    comp  = "__decc__=1"
 $  endif
 $ endif
 $!
-$! Build the thing plain or with mms
+$! Build the thing plain or with mms/mmk
 $!
 $ write sys$output "Compiling Libpng sources ..."
-$ if f$search("SYS$SYSTEM:MMS.EXE").eqs.""
+$ if make.eqs.""
 $  then
 $   dele pngtest.obj;*
 $   CALL MAKE png.OBJ "cc ''CCOPT' png" -
@@ -72,12 +91,13 @@ $   write sys$output "Building pngtest..."
 $   CALL MAKE pngtest.OBJ "cc ''CCOPT' pngtest" -
 	pngtest.c png.h pngconf.h
 $   call make pngtest.exe -
-                "LINK pngtest,libpng.olb/lib,''zlibsrc'libgz.olb/lib" - 
+	"LINK pngtest,libpng.olb/lib,''zlibsrc'libz.olb/lib" -
 	pngtest.obj libpng.olb
 $   write sys$output "Testing Libpng..."
 $   run pngtest
 $  else
-$   mms/macro=('comp',zlibsrc='zlibsrc')
+$   if f$search("DESCRIP.MMS") .eqs. "" then copy/nolog [.SCRIPTS]DESCRIP.MMS []
+$   'make'/macro=('comp',zlibsrc='zlibsrc')
 $  endif
 $ write sys$output "Libpng build completed"
 $ exit
@@ -122,4 +142,3 @@ $ VV='F$Verify(VV)
 $Exit:
 $ If V Then Set Verify
 $ENDSUBROUTINE
-

src/png/scripts/pngos2.def

@@ -1,262 +1,212 @@
 ;----------------------------------------
-; PNGLIB module definition file for OS/2
+; PNG.LIB module definition file for OS/2
 ;----------------------------------------
 
+; Version 1.2.4
+
 LIBRARY		PNG
 DESCRIPTION	"PNG image compression library for OS/2"
 CODE		PRELOAD MOVEABLE DISCARDABLE
 DATA		PRELOAD MOVEABLE MULTIPLE
 
 EXPORTS
-  png_set_sig_bytes
+
-  png_sig_cmp
+
+  png_build_grayscale_palette
   png_check_sig
-  png_create_read_struct
+  png_chunk_error
-  png_create_write_struct
+  png_chunk_warning
-  png_write_chunk
-  png_write_chunk_start
-  png_write_chunk_data
-  png_write_chunk_end
-  png_create_info_struct
-  png_info_init
-  png_write_info
-  png_read_info
-  png_convert_to_rfc1123
   png_convert_from_struct_tm
   png_convert_from_time_t
-  png_set_expand
+  png_create_info_struct
-  png_set_bgr
+  png_create_read_struct
-  png_set_gray_to_rgb
+  png_create_write_struct
-; png_set_rgb_to_gray
+  png_data_freer
-  png_build_grayscale_palette
-  png_set_strip_alpha
-  png_set_swap_alpha
-  png_set_invert_alpha
-  png_set_filler
-  png_set_swap
-  png_set_packing
-  png_set_packswap
-  png_set_shift
-  png_set_interlace_handling
-  png_set_invert_mono
-  png_set_background
-  png_set_strip_16
-  png_set_dither
-  png_set_gamma
-  png_set_flush
-  png_write_flush
-  png_start_read_image
-  png_read_update_info
-  png_read_rows
-  png_read_row
-  png_read_image
-  png_write_row
-  png_write_rows
-  png_write_image
-  png_write_end
-  png_read_end
   png_destroy_info_struct
   png_destroy_read_struct
-  png_read_destroy
   png_destroy_write_struct
-; png_write_destroy_info
+  png_error
-  png_write_destroy
-  png_set_crc_action
-  png_set_filter
-  png_set_filter_heuristics
-  png_set_compression_level
-  png_set_compression_mem_level
-  png_set_compression_strategy
-  png_set_compression_window_bits
-  png_set_compression_method
-  png_init_io
-  png_set_error_fn
-  png_get_error_ptr
-  png_set_write_fn
-  png_set_read_fn
-  png_set_write_status_fn
-  png_set_read_status_fn
-  png_get_io_ptr
-  png_set_progressive_read_fn
-  png_set_read_status_fn
-  png_set_read_user_transform_fn
-  png_set_write_status_fn
-  png_set_write_user_transform_fn
-  png_get_progressive_ptr
-  png_process_data
-  png_progressive_combine_row
-  png_malloc
   png_free
+  png_free_data
+  png_get_IHDR
+  png_get_PLTE
+  png_get_bKGD
+  png_get_bit_depth
+  png_get_cHRM
+  png_get_cHRM_fixed
+  png_get_channels
+  png_get_color_type
+  png_get_compression_buffer_size
+  png_get_compression_type
+  png_get_copyright
+  png_get_error_ptr
+  png_get_filter_type
+  png_get_gAMA
+  png_get_gAMA_fixed
+  png_get_hIST
+  png_get_header_ver
+  png_get_header_version
+  png_get_iCCP
+  png_get_image_height
+  png_get_image_width
+  png_get_interlace_type
+  png_get_io_ptr
+  png_get_libpng_ver
+  png_get_oFFs
+  png_get_pCAL
+  png_get_pHYs
+  png_get_pixel_aspect_ratio
+  png_get_pixels_per_meter
+  png_get_progressive_ptr
+  png_get_rgb_to_gray_status
+  png_get_rowbytes
+  png_get_rows
+  png_get_sBIT
+  png_get_sCAL
+  png_get_sPLT
+  png_get_sRGB
+  png_get_signature
+  png_get_tIME
+  png_get_tRNS
+  png_get_text
+  png_get_unknown_chunks
+  png_get_user_chunk_ptr
+  png_get_user_transform_ptr
+  png_get_valid
+  png_get_x_offset_microns
+  png_get_x_offset_pixels
+  png_get_x_pixels_per_meter
+  png_get_y_offset_microns
+  png_get_y_offset_pixels
+  png_get_y_pixels_per_meter
+  png_malloc
   png_memcpy_check
   png_memset_check
-; png_debug_malloc
+  png_permit_empty_plte
-; png_debug_free
+  png_process_data
-; png_far_to_near
+  png_progressive_combine_row
-  png_error
+  png_read_end
-  png_chunk_error
+  png_read_image
-  png_warning
+  png_read_info
-  png_chunk_warning
+  png_read_init ; deprecated
-  png_get_valid
+  png_read_png
-  png_get_rowbytes
+  png_read_row
-  png_get_channels
+  png_read_rows
-  png_get_image_width
+  png_read_update_info
-  png_get_image_height
+  png_reset_zstream
-  png_get_bit_depth
-  png_get_color_type
-  png_get_filter_type
-  png_get_interlace_type
-  png_get_compression_type
-  png_get_pixels_per_meter
-  png_get_pixel_aspect_ratio
-  png_get_x_offset_pixels
-  png_get_y_offset_pixels
-  png_get_x_offset_microns
-  png_get_y_offset_microns
-  png_get_signature
-  png_get_bKGD
-  png_set_bKGD
-  png_get_cHRM
-  png_set_cHRM
-  png_get_gAMA
-  png_set_gAMA
-  png_get_hIST
-  png_set_hIST
-  png_get_IHDR
   png_set_IHDR
-  png_get_oFFs
-  png_set_oFFs
-  png_get_pCAL
-  png_set_pCAL
-  png_get_pHYs
-  png_set_pHYs
-  png_get_PLTE
   png_set_PLTE
-  png_get_sBIT
+  png_set_bKGD
+  png_set_background
+  png_set_bgr
+  png_set_cHRM
+  png_set_cHRM_fixed
+  png_set_compression_buffer_size
+  png_set_compression_level
+  png_set_compression_mem_level
+  png_set_compression_method
+  png_set_compression_strategy
+  png_set_compression_window_bits
+  png_set_crc_action
+  png_set_dither
+  png_set_error_fn
+  png_set_expand
+  png_set_filler
+  png_set_filter
+  png_set_filter_heuristics
+  png_set_flush
+  png_set_gAMA
+  png_set_gAMA_fixed
+  png_set_gamma
+  png_set_gray_1_2_4_to_8
+  png_set_gray_to_rgb
+  png_set_hIST
+  png_set_iCCP
+  png_set_interlace_handling
+  png_set_invert_alpha
+  png_set_invert_mono
+  png_set_keep_unknown_chunks
+  png_set_oFFs
+  png_set_pCAL
+  png_set_pHYs
+  png_set_packing
+  png_set_packswap
+  png_set_palette_to_rgb
+  png_set_progressive_read_fn
+  png_set_read_fn
+  png_set_read_status_fn
+  png_set_read_user_chunk_fn
+  png_set_read_user_transform_fn
+  png_set_rgb_to_gray
+  png_set_rgb_to_gray_fixed
+  png_set_rows
   png_set_sBIT
-  png_get_sRGB
+  png_set_sCAL
+  png_set_sPLT
   png_set_sRGB
   png_set_sRGB_gAMA_and_cHRM
-  png_get_text
+  png_set_shift
-  png_set_text
+  png_set_sig_bytes
-  png_get_tIME
+  png_set_strip_16
+  png_set_strip_alpha
+  png_set_swap
+  png_set_swap_alpha
   png_set_tIME
-  png_get_tRNS
   png_set_tRNS
+  png_set_tRNS_to_alpha
+  png_set_text
+  png_set_unknown_chunk_location
+  png_set_unknown_chunks
+  png_set_user_transform_info
+  png_set_write_fn
+  png_set_write_status_fn
+  png_set_write_user_transform_fn
+  png_sig_cmp
+  png_start_read_image
+  png_warning
+  png_write_chunk
+  png_write_chunk_data
+  png_write_chunk_end
+  png_write_chunk_start
+  png_write_end
+  png_write_flush
+  png_write_image
+  png_write_info
+  png_write_info_before_PLTE
+  png_write_init ; deprecated
+  png_write_png
+  png_write_row
+  png_write_rows
+  png_read_init_2
+  png_write_init_2
+  png_access_version_number
+  png_init_io
+  png_convert_to_rfc1123
+  png_set_invalid
 
-  png_create_struct
+; Added at version 1.2.0:
-  png_destroy_struct
+  png_mmx_support
-  png_info_destroy
+  png_permit_empty_plte
-  png_zalloc
+  png_permit_mng_features
-  png_zfree
+  png_get_mmx_flagmask
-  png_reset_crc
+  png_get_asm_flagmask
-  png_write_data
+  png_get_asm_flags
-  png_read_data
+  png_get_mmx_bitdepth_threshold
-  png_crc_read
+  png_get_mmx_rowbytes_threshold
-  png_crc_finish
+  png_set_asm_flags
-  png_crc_error
+  png_init_mmx_flags
-  png_calculate_crc
-  png_flush
-  png_save_uint_32
-  png_save_int_32
-  png_save_uint_16
-  png_write_sig
-  png_write_IHDR
-  png_write_PLTE
-  png_write_IDAT
-  png_write_IEND
-  png_write_gAMA
-  png_write_sBIT
-  png_write_cHRM
-  png_write_sRGB
-  png_write_tRNS
-  png_write_bKGD
-  png_write_hIST
-  png_check_keyword
-  png_write_tEXt
-  png_write_zTXt
-  png_write_oFFs
-  png_write_pCAL
-  png_write_pHYs
-  png_write_tIME
-  png_write_finish_row
-  png_write_start_row
-  png_build_gamma_table
-  png_combine_row
-  png_do_read_interlace
-  png_do_write_interlace
-  png_read_filter_row
-  png_write_find_filter
-  png_write_filtered_row
-  png_read_finish_row
-  png_read_start_row
-  png_read_transform_info
-  png_do_read_filler
-  png_do_read_swap_alpha
-  png_do_write_swap_alpha
-  png_do_read_invert_alpha
-  png_do_write_invert_alpha
-  png_do_strip_filler
-  png_do_swap
-  png_do_packswap
-; png_do_rgb_to_gray
-  png_do_gray_to_rgb
-  png_do_unpack
-  png_do_unshift
-  png_do_invert
-  png_do_chop
-  png_do_dither
-; png_correct_palette
-  png_do_bgr
-  png_do_pack
-  png_do_shift
-  png_do_background
-  png_do_gamma
-  png_do_expand_palette
-  png_do_expand
-  png_handle_IHDR
-  png_handle_PLTE
-  png_handle_IEND
-  png_handle_gAMA
-  png_handle_sBIT
-  png_handle_cHRM
-  png_handle_sRGB
-  png_handle_tRNS
-  png_handle_bKGD
-  png_handle_hIST
-  png_handle_oFFs
-  png_handle_pCAL
-  png_handle_pHYs
-  png_handle_tIME
-  png_handle_tEXt
-  png_handle_zTXt
-  png_handle_unknown
-  png_check_chunk_name
-  png_do_read_transformations
-  png_do_write_transformations
-  png_init_read_transformations
-  png_push_read_chunk
-  png_push_read_sig
-; png_push_check_crc
-  png_push_crc_skip
-  png_push_crc_finish
-  png_push_fill_buffer
-  png_push_save_buffer
-  png_push_restore_buffer
-  png_push_read_IDAT
-  png_process_IDAT_data
-  png_push_process_row
-  png_push_handle_unknown
-  png_push_have_info
-  png_push_have_end
-  png_push_have_row
-; png_push_read_end
-  png_process_some_data
-  png_read_push_finish_row
-  png_push_handle_tEXt
-  png_push_read_tEXt
-  png_push_handle_zTXt
-  png_push_read_zTXt
 
+; Added at version 1.2.2:
+  png_handle_as_unknown
+
+; Added at version 1.2.2 and deleted from 1.2.3:
+; png_zalloc
+; png_zfree
+
+; Added at version 1.2.4
+  png_malloc_warn
+
+; These are not present when libpng is compiled with PNG_NO_GLOBAL_ARRAYS
   png_libpng_ver
   png_pass_start
   png_pass_inc
@@ -267,6 +217,7 @@ EXPORTS
 ; png_pass_width
 ; png_pass_height
 
+; These are not present when libpng is compiled with PNG_NO_GLOBAL_ARRAYS
   png_IHDR
   png_IDAT
   png_IEND
@@ -275,10 +226,14 @@ EXPORTS
   png_cHRM
   png_gAMA
   png_hIST
+  png_iCCP
+  png_iTXt
   png_oFFs
   png_pCAL
   png_pHYs
   png_sBIT
+  png_sCAL
+  png_sPLT
   png_sRGB
   png_tEXt
   png_tIME

src/png/scripts/smakefile.ppc

@@ -1,6 +1,7 @@
 # Amiga powerUP (TM) Makefile
 # makefile for libpng and SAS C V6.58/7.00 PPC compiler
 # Copyright (C) 1998 by Andreas R. Kleinert
+# For conditions of distribution and use, see copyright notice in png.h
 
 CC       = scppc
 CFLAGS   = NOSTKCHK NOSINT OPTIMIZE OPTGO OPTPEEP OPTINLOCAL OPTINL IDIR /zlib \