Imported from libpng-1.0.1c.tar

ANNOUNCE

@@ -0,0 +1,49 @@
+
+Libpng 1.0.1c May 9, 1998
+
+This is not intended to be a public release.  It will be replaced
+within a few weeks by a public version or by another test version.
+
+Changes since the last public release:
+
+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 9, 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_WRIGHT_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" for the capabilities in pngconf.h
+    to make it easier to remove unwanted capabilities via the compile line
+
+Send comments/corrections/commendations to
+png-implement@dworkin.wustl.edu or to randeg@alumni.rpi.edu
+
+Glenn R-P

CHANGES

@@ -1,189 +1,324 @@
-pngchange.txt - changes for libpng
+CHANGES - changes for libpng
 
 version 0.2
-   added reader into png.h
-   fixed small problems in stub file
+  added reader into png.h
+  fixed small problems in stub file
 version 0.3
-   added pull reader
-   split up pngwrite.c to several files
-   added pnglib.txt
-   added example.c
-   cleaned up writer, adding a few new tranformations
-   fixed some bugs in writer
-   interfaced with zlib 0.5
-   added K&R support
-   added check for 64 KB blocks for 16 bit machines
+  added pull reader
+  split up pngwrite.c to several files
+  added pnglib.txt
+  added example.c
+  cleaned up writer, adding a few new tranformations
+  fixed some bugs in writer
+  interfaced with zlib 0.5
+  added K&R support
+  added check for 64 KB blocks for 16 bit machines
 version 0.4
-   cleaned up code and commented code
-   simplified time handling into png_time
-   created png_color_16 and png_color_8 to handle color needs
-   cleaned up color type defines
-   fixed various bugs
-   made various names more consistant
-   interfaced with zlib 0.71
-   cleaned up zTXt reader and writer (using zlib's Reset functions)
-   split transformations into pngrtran.c and pngwtran.c
+  cleaned up code and commented code
+  simplified time handling into png_time
+  created png_color_16 and png_color_8 to handle color needs
+  cleaned up color type defines
+  fixed various bugs
+  made various names more consistant
+  interfaced with zlib 0.71
+  cleaned up zTXt reader and writer (using zlib's Reset functions)
+  split transformations into pngrtran.c and pngwtran.c
 version 0.5
-   interfaced with zlib 0.8
-   fixed many reading and writing bugs
-   saved using 3 spaces instead of tabs
+  interfaced with zlib 0.8
+  fixed many reading and writing bugs
+  saved using 3 spaces instead of tabs
 version 0.6
-   added png_large_malloc() and png_large_free()
-   added png_size_t
-   cleaned up some compiler warnings
-   added png_start_read_image()
+  added png_large_malloc() and png_large_free()
+  added png_size_t
+  cleaned up some compiler warnings
+  added png_start_read_image()
 version 0.7
-   cleaned up lots of bugs
-   finished dithering and other stuff
-   added test program
-   changed name from pnglib to libpng
+  cleaned up lots of bugs
+  finished dithering and other stuff
+  added test program
+  changed name from pnglib to libpng
 version 0.71 [June, 1995]
-   changed pngtest.png for zlib 0.93
-   fixed error in libpng.txt and example.c
+  changed pngtest.png for zlib 0.93
+  fixed error in libpng.txt and example.c
 version 0.8
-   cleaned up some bugs
-   added png_set_filler()
-   split up pngstub.c into pngmem.c, pngio.c, and pngerror.c
-   added #define's to remove unwanted code
-   moved png_info_init() to png.c
-   added old_size into png_realloc()
-   added functions to manually set filtering and compression info
-   changed compression parameters based on image type
-   optimized filter selection code
-   added version info
-   changed external functions passing floats to doubles (k&r problems?)
-   put all the configurable stuff in pngconf.h
-   enabled png_set_shift to work with paletted images on read
-   added png_read_update_info() - updates info structure with
-      transformations
+  cleaned up some bugs
+  added png_set_filler()
+  split up pngstub.c into pngmem.c, pngio.c, and pngerror.c
+  added #define's to remove unwanted code
+  moved png_info_init() to png.c
+  added old_size into png_realloc()
+  added functions to manually set filtering and compression info
+  changed compression parameters based on image type
+  optimized filter selection code
+  added version info
+  changed external functions passing floats to doubles (k&r problems?)
+  put all the configurable stuff in pngconf.h
+  enabled png_set_shift to work with paletted images on read
+  added png_read_update_info() - updates info structure with
+     transformations
 version 0.81 [August, 1995]
-   incorporated Tim Wegner's medium model code (thanks, Tim)
+  incorporated Tim Wegner's medium model code (thanks, Tim)
 version 0.82 [September, 1995]
-   [unspecified changes]
+  [unspecified changes]
 version 0.85 [December, 1995]
-   added more medium model code (almost everything's a far)
-   added i/o, error, and memory callback functions
-   fixed some bugs (16 bit, 4 bit interlaced, etc.)
-   added first run progressive reader (barely tested)
+  added more medium model code (almost everything's a far)
+  added i/o, error, and memory callback functions
+  fixed some bugs (16 bit, 4 bit interlaced, etc.)
+  added first run progressive reader (barely tested)
 version 0.86 [January, 1996]
-   fixed bugs
-   improved documentation
+  fixed bugs
+  improved documentation
 version 0.87 [January, 1996]
-   fixed medium model bugs
-   fixed other bugs introduced in 0.85 and 0.86
-   added some minor documentation
+  fixed medium model bugs
+  fixed other bugs introduced in 0.85 and 0.86
+  added some minor documentation
 version 0.88 [January, 1996]
-   fixed progressive bugs
-   replaced tabs with spaces
-   cleaned up documentation
-   added callbacks for read/write and warning/error functions
+  fixed progressive bugs
+  replaced tabs with spaces
+  cleaned up documentation
+  added callbacks for read/write and warning/error functions
 version 0.89 [July, 1996]
-   added new initialization API to make libpng work better with shared libs
-      we now have png_create_read_struct(), png_create_write_struct(),
-      png_create_info_struct(), png_destroy_read_struct(), and
-      png_destroy_write_struct() instead of the separate calls to
-      malloc and png_read_init(), png_info_init(), and png_write_init()
-   changed warning/error callback functions to fix bug - this means you
-      should use the new initialization API if you were using the old
-      png_set_message_fn() calls, and that the old API no longer exists
-      so that people are aware that they need to change their code
-   changed filter selection API to allow selection of multiple filters
-      since it didn't work in previous versions of libpng anyways
-   optimized filter selection code    
-   fixed png_set_background() to allow using an arbitrary RGB color for
-      paletted images
-   fixed gamma and background correction for paletted images, so
-      png_correct_palette is not needed unless you are correcting an
-      external palette (you will need to #define PNG_CORRECT_PALETTE_SUPPORTED
-      in pngconf.h) - if nobody uses this, it may disappear in the future.
-   fixed bug with Borland 64K memory allocation (Alexander Lehmann)
-   fixed bug in interlace handling (Smarasderagd, I think)
-   added more error checking for writing and image to reduce invalid files
-   separated read and write functions so that they won't both be linked
-      into a binary when only reading or writing functionality is used
-   new pngtest image also has interlacing and zTXt
-   updated documentation to reflect new API
+  added new initialization API to make libpng work better with shared libs
+     we now have png_create_read_struct(), png_create_write_struct(),
+     png_create_info_struct(), png_destroy_read_struct(), and
+     png_destroy_write_struct() instead of the separate calls to
+     malloc and png_read_init(), png_info_init(), and png_write_init()
+  changed warning/error callback functions to fix bug - this means you
+     should use the new initialization API if you were using the old
+     png_set_message_fn() calls, and that the old API no longer exists
+     so that people are aware that they need to change their code
+  changed filter selection API to allow selection of multiple filters
+     since it didn't work in previous versions of libpng anyways
+  optimized filter selection code    
+  fixed png_set_background() to allow using an arbitrary RGB color for
+     paletted images
+  fixed gamma and background correction for paletted images, so
+     png_correct_palette is not needed unless you are correcting an
+     external palette (you will need to #define PNG_CORRECT_PALETTE_SUPPORTED
+     in pngconf.h) - if nobody uses this, it may disappear in the future.
+  fixed bug with Borland 64K memory allocation (Alexander Lehmann)
+  fixed bug in interlace handling (Smarasderagd, I think)
+  added more error checking for writing and image to reduce invalid files
+  separated read and write functions so that they won't both be linked
+     into a binary when only reading or writing functionality is used
+  new pngtest image also has interlacing and zTXt
+  updated documentation to reflect new API
 version 0.90 [January, 1997]
-   made CRC errors/warnings on critical and ancillary chunks configurable
-   libpng will use the zlib CRC routines by (compile-time) default
-   changed DOS small/medium model memory support - needs zlib 1.04 (Tim Wegner)
-   added external C++ wrapper statements to png.h (Gilles Dauphin)
-   allow PNG file to be read when some or all of file signature has already
-      been read from the beginning of the stream.  ****This affects the size
-      of info_struct and invalidates all programs that use a shared libpng****
-   fixed png_filler() declarations
-   fixed? background color conversions
-   fixed order of error function pointers to match documentation
-   current chunk name is now available in png_struct to reduce the number
-      of nearly identical error messages (will simplify multi-lingual
-      support when available)
-   try to get ready for unknown-chunk callback functions:
-      - previously read critical chunks are flagged, so the chunk handling
-        routines can determine if the chunk is in the right place
-      - 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
+  made CRC errors/warnings on critical and ancillary chunks configurable
+  libpng will use the zlib CRC routines by (compile-time) default
+  changed DOS small/medium model memory support - needs zlib 1.04 (Tim Wegner)
+  added external C++ wrapper statements to png.h (Gilles Dauphin)
+  allow PNG file to be read when some or all of file signature has already
+     been read from the beginning of the stream.  ****This affects the size
+     of info_struct and invalidates all programs that use a shared libpng****
+  fixed png_filler() declarations
+  fixed? background color conversions
+  fixed order of error function pointers to match documentation
+  current chunk name is now available in png_struct to reduce the number
+     of nearly identical error messages (will simplify multi-lingual
+     support when available)
+  try to get ready for unknown-chunk callback functions:
+     - previously read critical chunks are flagged, so the chunk handling
+       routines can determine if the chunk is in the right place
+     - 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
 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
-   changed parameter type of png_set_filler(...filler...) from png_byte
-      to png_uint_32
-   added test for MACOS to ensure that both math.h and fp.h are not #included
-   added macros for libpng to be compiled as a Windows DLL (Andreas Kupries)
-   added "packswap" transformation, which changes the endianness of
-      packed-pixel bytes (Kevin Bracey)
-   added "strip_alpha" transformation, which removes the alpha channel of
-      input images without using it (not neccesarily a good idea)
-   added "swap_alpha" transformation, which puts the alpha channel in front
-      of the color bytes instead of after
-   removed all implicit variable tests which assume NULL == 0 (I think)
-   changed several variables to "png_size_t" to show 16/32-bit limitations
-   added new pCAL chunk read/write support
-   added experimental filter selection weighting (Greg Roelofs)
-   removed old png_set_rgbx() and png_set_xrgb() functions that have been
-      obsolete for about 2 years now (use png_set_filler() instead)
-   added macros to read 16- and 32-bit ints directly from buffer, to be
-      used only on those systems that support it (namely PowerPC and 680x0)
-      With some testing, this may become the default for MACOS/PPC systems.
-   only calculate CRC on data if we are going to use it
-   added macros for zTXt compression type PNG_zTXt_COMPRESSION_???
-   added macros for simple libpng debugging output selectable at compile time
-   removed PNG_READ_END_MODE in progressive reader (Smarasderagd)
-   more description of info_struct in libpng.txt and png.h
-   more instructions in example.c
-   more chunk types tested in pngtest.c
-   renamed pngrcb.c to pngset.c, and all png_read_<chunk> functions to be
-      png_set_<chunk>.  We now have corresponding png_get_<chunk>
-      functions in pngget.c to get infomation in info_ptr.  This isolates
-      the application from the internal organization of png_info_struct
-      (good for shared library implementations).
+  fixed bug in pngwutil.c allocating "up_row" twice and "avg_row" never
+  fixed bug in PNG file signature compares when start != 0
+  changed parameter type of png_set_filler(...filler...) from png_byte
+     to png_uint_32
+  added test for MACOS to ensure that both math.h and fp.h are not #included
+  added macros for libpng to be compiled as a Windows DLL (Andreas Kupries)
+  added "packswap" transformation, which changes the endianness of
+     packed-pixel bytes (Kevin Bracey)
+  added "strip_alpha" transformation, which removes the alpha channel of
+     input images without using it (not neccesarily a good idea)
+  added "swap_alpha" transformation, which puts the alpha channel in front
+     of the color bytes instead of after
+  removed all implicit variable tests which assume NULL == 0 (I think)
+  changed several variables to "png_size_t" to show 16/32-bit limitations
+  added new pCAL chunk read/write support
+  added experimental filter selection weighting (Greg Roelofs)
+  removed old png_set_rgbx() and png_set_xrgb() functions that have been
+     obsolete for about 2 years now (use png_set_filler() instead)
+  added macros to read 16- and 32-bit ints directly from buffer, to be
+     used only on those systems that support it (namely PowerPC and 680x0)
+     With some testing, this may become the default for MACOS/PPC systems.
+  only calculate CRC on data if we are going to use it
+  added macros for zTXt compression type PNG_zTXt_COMPRESSION_???
+  added macros for simple libpng debugging output selectable at compile time
+  removed PNG_READ_END_MODE in progressive reader (Smarasderagd)
+  more description of info_struct in libpng.txt and png.h
+  more instructions in example.c
+  more chunk types tested in pngtest.c
+  renamed pngrcb.c to pngset.c, and all png_read_<chunk> functions to be
+     png_set_<chunk>.  We now have corresponding png_get_<chunk>
+     functions in pngget.c to get infomation in info_ptr.  This isolates
+     the application from the internal organization of png_info_struct
+     (good for shared library implementations).
 version 0.96 [May, 1997]
-   fixed serious bug with < 8bpp images introduced in 0.95
-   fixed 256-color transparency bug (Greg Roelofs)
-   fixed up documentation (Greg Roelofs, Laszlo Nyul)
-   fixed "error" in pngconf.h for Linux setjmp() behaviour
-   fixed DOS medium model support (Tim Wegner)
-   fixed png_check_keyword() for case with error in static string text
-   added read of CRC after IEND chunk for embedded PNGs (Laszlo Nyul)
-   added typecasts to quiet compiler errors
-   added more debugging info
+  fixed serious bug with < 8bpp images introduced in 0.95
+  fixed 256-color transparency bug (Greg Roelofs)
+  fixed up documentation (Greg Roelofs, Laszlo Nyul)
+  fixed "error" in pngconf.h for Linux setjmp() behaviour
+  fixed DOS medium model support (Tim Wegner)
+  fixed png_check_keyword() for case with error in static string text
+  added read of CRC after IEND chunk for embedded PNGs (Laszlo Nyul)
+  added typecasts to quiet compiler errors
+  added more debugging info
 version 0.97 [January, 1998]
-   removed PNG_USE_OWN_CRC capability
-   relocated png_set_crc_action from pngrutil.c to pngrtran.c
-   fixed typecasts of "new_key", etc.
-   added RFC 1152 date support
-   fixed bug in gamma handling of 4-bit grayscale
-   added more typecasts. 65536L becomes (png_uint_32)65536L, etc.
-   minor corrections in libpng.txt
-   added simple sRGB support
-   make it simpler to do conditional compiling: PNG_READ_NOT_FULLY_SUPPORTED
-   fixed memory leak in pngwrite.c (free info_ptr->text)
-   added more conditions for png_do_background, to avoid changing
-      black pixels to background when a background is supplied and
-      no pixels are transparent
-   repaired PNG_NO_STDIO behaviour
-   tested NODIV support and made it default behaviour
-   added "-m" option to pngtest
-   [anything else?  2-bit grayscale gamma bug?]
-   regularized version numbering scheme and bumped shared-library major
-      version number to 2 to avoid potential problems with libpng 0.89 apps
+  removed PNG_USE_OWN_CRC capability
+  relocated png_set_crc_action from pngrutil.c to pngrtran.c
+  fixed typecasts of "new_key", etc. (Andreas Dilger)
+  added RFC 1152 [sic] date support
+  fixed bug in gamma handling of 4-bit grayscale
+  added 2-bit grayscale gamma handling (Glenn R-P)
+  added more typecasts. 65536L becomes (png_uint_32)65536L, etc. (Glenn R-P)
+  minor corrections in libpng.txt
+  added simple sRGB support (Glenn R-P)
+  easier conditional compiling, e.g. define PNG_READ/WRITE_NOT_FULLY_SUPPORTED;
+     all configurable options can be selected from command-line instead
+     of having to edit pngconf.h (Glenn R-P)
+  fixed memory leak in pngwrite.c (free info_ptr->text) (Glenn R-P)
+  added more conditions for png_do_background, to avoid changing
+     black pixels to background when a background is supplied and
+     no pixels are transparent
+  repaired PNG_NO_STDIO behaviour
+  tested NODIV support and made it default behaviour (Greg Roelofs)
+  added "-m" option and PNGTEST_DEBUG_MEMORY to pngtest (John Bowler)
+  regularized version numbering scheme and bumped shared-library major
+     version number to 2 to avoid problems with libpng 0.89 apps (Greg Roelofs)
+version 0.98 [January, 1998]
+  cleaned up some typos in libpng.txt and in code documentation
+  fixed memory leaks in pCAL chunk processing (Glenn R-P and John Bowler)
+  cosmetic change "display_gamma" to "screen_gamma" in pngrtran.c
+  changed recommendation about file_gamma for PC images to .51 from .45,
+     in example.c and libpng.txt, added comments to distinguish between
+     screen_gamma, viewing_gamma, and display_gamma.
+  changed all references to RFC1152 to read RFC1123 and changed the
+     PNG_TIME_RFC1152_SUPPORTED macro to PNG_TIME_RFC1123_SUPPORTED
+  added png_invert_alpha capability (Glenn R-P -- suggestion by Jon Vincent)
+  changed srgb_intent from png_byte to int to avoid compiler bugs
+version 0.99 [January 30, 1998]
+  free info_ptr->text instead of end_info_ptr->text in pngread.c (John Bowler)
+  fixed a longstanding "packswap" bug in pngtrans.c
+  fixed some inconsistencies in pngconf.h that prevented compiling with
+     PNG_READ_GAMMA_SUPPORTED and PNG_READ_hIST_SUPPORTED undefined
+  fixed some typos and made other minor rearrangement of libpng.txt (Andreas)
+  changed recommendation about file_gamma for PC images to .50 from .51 in
+     example.c and libpng.txt, and changed file_gamma for sRGB images to .45
+  added a number of functions to access information from the png structure
+     png_get_image_height(), etc. (Glenn R-P, suggestion by Brad Pettit)
+  added TARGET_MACOS similar to zlib-1.0.8
+  define PNG_ALWAYS_EXTERN when __MWERKS__ && WIN32 are defined
+  added type casting to all png_malloc() function calls
+version 0.99a [January 31, 1998]
+  Added type casts and parentheses to all returns that return a value.(Tim W.)
+version 0.99b [February 4, 1998]
+  Added type cast png_uint_32 on malloc function calls where needed.
+  Changed type of num_hist from png_uint_32 to int (same as num_palette).
+  Added checks for rowbytes overflow, in case png_size_t is less than 32 bits.
+  Renamed makefile.elf to makefile.lnx.
+version 0.99c [February 7, 1998]
+  More type casting.  Removed erroneous overflow test in pngmem.c.
+  Added png_buffered_memcpy() and png_buffered_memset(), apply them to rowbytes.
+  Added UNIX manual pages libpng.3 (incorporating libpng.txt) and  png.5.
+version 0.99d [February 11, 1998]
+  Renamed "far_to_near()" "png_far_to_near()"
+  Revised libpng.3
+  Version 99c "buffered" operations didn't work as intended.  Replaced them
+    with png_memcpy_check() and png_memset_check().
+  Added many "if (png_ptr == NULL) return" to quell compiler warnings about
+    unused png_ptr, mostly in pngget.c and pngset.c.
+  Check for overlength tRNS chunk present when indexed-color PLTE is read.
+  Cleaned up spelling errors in libpng.3/libpng.txt
+  Corrected a problem with png_get_tRNS() which returned undefined trans array
+version 0.99e [February 28, 1998]
+  Corrected png_get_tRNS() again.
+  Add parentheses for easier reading of pngget.c, fixed "||" should be "&&".
+  Touched up example.c to make more of it compileable, although the entire
+    file still can't be compiled (Willem van Schaik)
+  Fixed a bug in png_do_shift() (Bryan Tsai)
+  Added a space in png.h prototype for png_write_chunk_start()
+  Replaced pngtest.png with one created with zlib 1.1.1
+  Changed pngtest to report PASS even when file size is different (Jean-loup G.)
+  Corrected some logic errors in png_do_invert_alpha() (Chris Patterson)
+version 0.99f [March 5, 1998]
+  Corrected a bug in pngpread() introduced in version 99c (Kevin Bracey)
+  Moved makefiles into a "scripts" directory, and added INSTALL instruction file
+  Added makefile.os2 and pngos2.def (A. Zabolotny) and makefile.s2x (W. Sebok)
+  Added pointers to "note on libpng versions" in makefile.lnx and README
+  Added row callback feature when reading and writing nonprogressive rows
+     and added a test of this feature in pngtest.c
+  Added user transform callbacks, with test of the feature in pngtest.c
+version 0.99g [March 6, 1998, morning]
+  Minor changes to pngtest.c to suppress compiler warnings.
+  Removed "beta" language from documentation.
+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
+version 1.00 [March 7, 1998]
+  Changed several typedefs in pngrutil.c
+  Added makefile.wat (Pawel Mrochen), updated makefile.tc3 (Willem van Schaik)
+  replaced "while(1)" with "for(;;)"
+  added PNGARG() to prototypes in pngtest.c and removed some prototypes
+  updated some of the makefiles (Tom Lane)
+  changed some typedefs (s_start, etc.) in pngrutil.c
+  fixed dimensions of "short_months" array in pngwrite.c
+  Replaced ansi2knr.c with the one from jpeg-v6
+version 1.0.0 [March 8, 1998]
+  Changed name from 1.00 to 1.0.0 (Adam Costello)
+  Added smakefile.ppc (with SCOPTIONS.ppc) for Amiga PPC (Andreas Kleinert)
+version 1.0.0a [March 9, 1998]
+  Fixed three bugs in pngrtran.c to make gamma+background handling consistent
+  (Greg Roelofs)
+  Changed format of the PNG_LIBPNG_VER integer to xyyzz instead of xyz
+  for major, minor, and bugfix releases.  This is 10001. (Adam Costello,
+  Tom Lane)
+  Make months range from 1-12 in png_convert_to_rfc1123
+version 1.0.0b [March 13, 1998]
+  Quieted compiler complaints about two empty "for" loops in pngrutil.c
+  Minor changes to makefile.s2x
+  Removed #ifdef/#endif around a png_free() in pngread.c
+version 1.0.1 [March 14, 1998]
+  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 9, 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_WRIGHT_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

INSTALL

@@ -0,0 +1,87 @@
+
+Installing libpng version %VER% %DATE%
+
+Before installing libpng, you must first install zlib.  zlib
+can usually be found wherever you got libpng.  zlib can be
+placed in another directory, at the same level as libpng.
+Note that your system might already have a preinstalled
+zlib, but you will still need to have access to the 
+zlib.h and zconf.h include files that correspond to the
+version of zlib that's installed.
+
+You can rename the directories that you downloaded (they
+might be called "libpng-%VER% or "lpng100" and "zlib-1.1.1"
+or "zlib111") so that you have directories called "zlib" and "libpng".
+
+Your directory structure should look like this:
+
+   ..       (the parent directory)
+      libpng  (this directory)
+          INSTALL (this file)
+          README
+          *.h
+          *.c
+          scripts
+             makefile.*
+          pngtest.png
+          etc.
+      zlib
+          README
+          *.h
+          *.c
+          contrib
+          etc.
+
+First enter the zlib directory and follow the instructions
+in zlib/README.  Then come back here and choose the
+appropriate makefile.sys in the scripts directory.
+The files that are presently available in the scripts directory
+include
+
+      descrip.mms   =>  VMS makefile for MMS or MMK
+      makefile.std  =>  Generic UNIX makefile
+      makefile.knr  =>  Archaic UNIX Makefile that converts files with ansi2knr
+      makefile.dec  =>  DEC Alpha UNIX makefile
+      makefile.sgi  =>  Silicon Graphics IRIX makefile
+      makefile.sun  =>  Sun makefile
+      makefile.s2x  =>  Solaris 2.X makefile (gcc, creates libpng.so.2.1.0)
+      makefile.lnx  =>  Linux/ELF makefile (gcc, creates libpng.so.2.1.0)
+      makefile.mip  =>  MIPS makefile
+      makefile.aco  =>  Acorn makefile
+      makefile.ama  =>  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.bor  =>  Borland makefile
+      build.bat     =>  MS-DOS batch file for Borland compiler
+      makefile.dj2  =>  DJGPP 2 makefile
+      makefile.msc  =>  Microsoft C makefile
+      makefile.tc3  =>  Turbo C 3.0 makefile
+      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
+      makevms.com   =>  VMS build script
+
+Copy the file (or files) that you need from the
+scripts directory into this directory, for example
+
+   MSDOS example: copy scripts\makefile.msd makefile
+   UNIX example:    cp scripts/makefile.std makefile
+
+Read the makefile to see if you need to change any source or
+target directories to match your preferences.
+
+Then read pngconf.h to see if you want to make any configuration
+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.
+
+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).
+
+Further information can be found in the README and libpng.txt
+files, in the individual makefiles, and in png.h, and the manual
+pages libpng.3 and png.5.

KNOWNBUG

@@ -0,0 +1,158 @@
+
+Known bugs and suggested enhancements in libpng-1.0.1
+
+1. March 13, 1998 -- BUG -- pngtrans.c:
+
+   row_info->channels should be updated --
+   row_info->color_type should be updated --
+
+   STATUS: I think this is all fixed in libpng-1.0.1a but needs
+   to be tested.
+
+2. March 14, 1998 -- ENHANCEMENT -- Glenn
+
+   We should add the G>GA, G>GX, G>AG, and G>XG transformations
+   in png_do_read_filler()
+
+   STATUS:  Implemented in libpng-1.0.1a
+
+3. March 14, 1998 -- BUG? -- Greg Roelofs
+
+   pngrtran.c:  if-test for channels/FILLER may be incorrect
+
+   STATUS: Under investigation.  Appears to be working correctly
+   in libpng-1.0.1c.
+
+4. March 15, 1998 -- BUG -- Kevin Bracey
+
+   pngwtran.c:
+      line 306: loop should count to row_info->width, not to
+             row_info->width*row_info->channnels
+
+   STATUS: Fixed in libpng-1.0.1a
+
+5. March 15, 1998 -- OPTIMIZATION -- Kevin Bracey
+
+   Loops need to be optimized everywhere
+
+   a. Make them count down instead of up -- Kevin Bracey
+   
+      Optimizing compilers don't need this, and making
+      the change would be error prone -- Tom Lane, Glenn R-P
+
+      Question whether i-- or --i is better.
+
+      STATUS: Under investigation.
+
+   b. Remove products and structure members from loop tests -- Glenn R-P
+
+      Can be accomplished without messing with loop guts.  This
+      was shown to be effective on optimized SGI compiler:
+
+              replace
+                  png_uint_32 i;
+                  for(i=0; i < s->a*s->b; i++)
+              with
+                  png_uint_32 i, istop;
+                  istop = s->a*s->b;
+                  for(i=0; i<istop; i++)
+
+      STATUS: Mostly done in libpng-1.0.1a, done for all important loops.
+              More done in libpng-1.0.1b.
+
+   c. Replace abs() with intrinsic ternary operations in Paeth
+      filtering -- Glenn R-P
+
+      STATUS: Done in libpng-1.0.1a
+      (can be restored to original behavior with #define PNG_USE_ABS)
+
+   d. In pngwutil.c, make separate simple loops to use when filter 
+      heuristic sums aren't needed. -- Glenn R-P
+
+      STATUS: Done in libpng-1.0.1a
+
+6. April 6, 1998 -- BUG -- bug in pngset.c (rowbytes too large) -- Bob Dellaca
+
+   pngset.c has a bug, introduced in version 0.99c, that sets rowbytes
+     too large when writing an image with bit_depth < 8
+
+   STATUS: Fixed in libpng-1.0.1a
+              
+7. April 10, 1998 -- BUG -- pngwutil weighted filtering bugs -- Glenn R-P
+
+   pngwutil.c has some bugs in the experimental weighted filter
+   algorithm (PNG_FILTER_XXX should be PNG_FILTER_VALUE_XXX in
+   several places)
+
+   STATUS: Andreas concurs.  Fixed in libpng-1.0.1a
+
+8. April 10, 1998 -- ENHANCEMENT -- run-time selection of malloc function
+   -- Bob Dellaca
+
+   pngmem.c currently provides a compile-time option to replace
+   png_malloc() and png_free().  It's been requested that these
+   be made possible at run time, via calls to new png_set_malloc_fn()
+   and png_set_free_fn() functions.
+
+   STATUS: Under consideration
+
+9. April 11, 1998 -- BUG -- incorrect truncation of tRNS data in
+   illegal PNG file where tRNS precedes PLTE -- Larry Reeve
+
+   There is a misplaced pngrutil code block that truncates tRNS if it has
+   more than num_palette entries -- test was done before num_palette was
+   defined.  Although the PNG file is illegal, it shouldn't crash apps.
+   There is a simple fix; just moving the test to the point after
+   num_palette has been defined.
+
+   STATUS: Fixed in libpng-1.0.1a
+
+10. April 16, 1998 -- BUG -- incorrect operation of png_convert_to_rfc1123
+   with 31st day of the month -- Steve Eddins
+
+   The "ptime->date % 31" is wrong, should be "ptime->date % 32".
+
+   STATUS: Fixed in libpng-1.0.1a
+
+11. April 21, 1998 -- ENHANCEMENT -- relocation of composite macros
+
+   png_composite() and png_composite_16() relocated to png.h
+
+   STATUS: Done in libpng-1.0.1b
+
+12. April 22, 1998 -- ENHANCEMENT -- makefile.sco
+
+   Mike Hopkirk contributed a makefile for SCO osr5 and sco UW7
+
+   STATUS: Added to libpng-1.0.1b distribution
+
+13: April 30, 1998 -- ENHANCEMENT -- warnings
+
+   When people define out some of the read transformations and then
+   try to use them, the request is silently ignored.  It was suggested
+   that a warning be issued in such cases.
+
+   STATUS: Done in libpng-1.0.1b
+
+14. May 2, 1998 -- BUG -- incorrect mask for filler bytes
+
+   In pngrtran.c, png_do_filler(), the masks for hi_filler and low_filler
+   should be 0xff instead of 0xf
+
+   STATUS: Fixed in libpng-1.0.1c
+
+15. May 3, 1998 -- BUG -- buffer overflow in png_do_read_filler()
+
+   In pngrutil.c, max_pixel_depth needs to be set to 32 when using
+   png_do_read_filler with palette images.
+
+   STATUS: Fixed in libpng-1.0.1c (see also items 1 and 3 above).
+
+16. May 3, 1998 -- BUG -- type definitions wrong on error functions -- Tom Lane
+
+   In png_create_xxx_struct(), the error functions should have typedef
+   png_voidp instead of (void *).  Needs to be corrected in the functions,
+   the prototypes in png.h, the example.c file, and libpng.txt and libpng.3
+
+   
+   STATUS: Fixed in libpng-1.0.1c

README

@@ -1,12 +1,11 @@
-[NOTE:  this is still beta version 0.97c; the text below has already
- been updated in anticipation of the imminent 1.0 release.]
+README for libpng %VER% (shared library 2.1)
+See the note about version numbers near the top of png.h
 
-
-README for libpng 1.0
+See INSTALL for instructions on how to install libpng.
 
 This is 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 for about two years.  However, it's
+extensive use and testing for about two and a half years.  However, it's
 finally gotten to the stage where there haven't been significant
 changes to the API in some time, and people have a bad feeling about
 libraries with versions < 1.0.
@@ -77,7 +76,7 @@ If not, it should be at ftp.uu.net in /graphics/png
 Eventually, it will be at ftp.uu.net in /pub/archiving/zip/zlib
 
 You may also want a copy of the PNG specification.  It is available
-as an Internet Draft, and RFC, and a W3C Recommendation.  Failing
+as an RFC and a W3C Recommendation.  Failing
 these resources you can try ftp.uu.net in the /graphics/png directory.
 
 This code is currently being archived at ftp.uu.net in the
@@ -97,19 +96,19 @@ Finally, if you get any warning messages when compiling libpng
 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 earlier work), and the PNG group.
+based in a large way on Guy's and Andreas' earlier work), and the PNG group.
 
-adilger@enel.ucalgary.ca
+randeg@alumni.rpi.edu
 png-implement@dworkin.wustl.edu
 
-You can reach Guy, the original libpng author, at (internet preferred):
-
-internet: schalnat@group42.com
-CompuServe: 75501,1625
+You can't reach Guy, the original libpng author, at the addresses
+given in previous versions of this document.  He and Andreas will read mail
+addressed to the png-implement list, however.
 
 Please do not send general questions about PNG.  Send them to
-the address in the specification.  At the same time, please do
-not send libpng questions to that address, send them to me.  I'll
+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
 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,
@@ -117,7 +116,7 @@ and ...".  If in doubt, send questions to me.  I'll bounce them
 to others, if necessary.
 
 Please do not send suggestions on how to change PNG.  We have
-been discussing PNG for a couple years now, and it is official and
+been discussing PNG for three years now, and it is official and
 finished.  If you have suggestions for libpng, however, I'll
 gladly listen.  Even if your suggestion is not used for version
 1.0, it may be used later.
@@ -127,28 +126,20 @@ Files in this distribution:
       CHANGES       =>  Description of changes between libpng versions
       README        =>  This file
       TODO          =>  Things not implemented in the current library
+      ansi2knr.1    =>  Manual page for ansi2knr
       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.txt    =>  Description of libpng and its functions
-      makefile      =>  Default Unixish makefile
-      makefile.aco  =>  ACORN makefile
-      makefile.ama  =>  Amiga makefile
-      makefile.atr  =>  Atari makefile
-      makefile.bor  =>  Borland makefile
-      makefile.dj2  =>  DJGPP 2 makefile
-      makefile.elf  =>  Unix ELF makefile
-      makefile.knr  =>  Makefile which calls ansi2knr to convert files
-      makefile.mip  =>  MIPS makefile
-      makefile.msc  =>  Microsoft C makefile
-      makefile.std  =>  Standard Unix makefile
-      makefile.tc   =>  Turbo C makefile
-      makevms.com   =>  VMS make program
+      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
       pngerror.c    =>  Error/warning message I/O functions
+      pngget.c      =>  Functions for retrieving info from struct
       pngmem.c      =>  Memory handling functions
       pngpread.c    =>  Progressive reading functions
       pngread.c     =>  Read data/helper high-level functions
@@ -163,16 +154,41 @@ Files in this distribution:
       pngwrite.c    =>  High-level write functions
       pngwtran.c    =>  Write data transformations
       pngwutil.c    =>  Write utility functions
+      scripts       =>  Directory containing scripts for building libpng:
+        descrip.mms   =>  VMS makefile for MMS or MMK
+        makefile.std  =>  Generic UNIX makefile
+        makefile.knr  =>  Archaic UNIX Makefile that converts files with ansi2knr
+        makefile.dec  =>  DEC Alpha UNIX makefile
+        makefile.sgi  =>  Silicon Graphics IRIX makefile
+        makefile.sun  =>  Sun makefile
+        makefile.s2x  =>  Solaris 2.X makefile (gcc, creates libpng.so.2.1.0)
+        makefile.lnx  =>  Linux/ELF makefile (gcc, creates libpng.so.2.1.0)
+        makefile.mip  =>  MIPS makefile
+        makefile.aco  =>  Acorn makefile
+        makefile.ama  =>  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.bor  =>  Borland makefile
+        build.bat     =>  MS-DOS batch file for Borland compiler
+        makefile.dj2  =>  DJGPP 2 makefile
+        makefile.msc  =>  Microsoft C makefile
+        makefile.tc3  =>  Turbo C 3.0 makefile
+        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
+        makevms.com   =>  VMS build script
 
 Good luck, and happy coding.
 
+-Glenn Randers-Pehrson
+ Internet: randeg@alumni.rpi.edu
+ Web: http://www.rpi.edu/~randeg/index.html
+
 -Andreas Eric Dilger
  Internet: adilger@enel.ucalgary.ca
  Web: http://www-mddsp.enel.ucalgary.ca/People/adilger/
 
 -Guy Eric Schalnat
- Group 42, Inc.
- Internet: schalnat@group42.com
- CompuServe: 75501,1625
- Web: http://www.group42.com/
-
+ (formerly of Group 42, Inc)
+ Internet: gschal@infinet.com

TODO

@@ -1,11 +1,14 @@
-pngtodo.txt - list of things to do for libpng
+TODO - list of things to do for libpng
 
+fix problem with C++ and EXTERN "C"
+add capability to set user malloc/free functions at run time
 add "grayscale->palette" transformation and "palette->grayscale" detection
+color to gray transformation
 improved dithering
 multi-lingual error and warning message support
 sPLT chunk handling
 cHRM transformation
-complete sRGB transformation (presently it simply uses gamma=0.5)
+complete sRGB transformation (presently it simply uses gamma=0.45)
 man pages for function calls
 high-level API for reading images
 final bug fixes

ansi2knr.1

@@ -0,0 +1,36 @@
+.TH ANSI2KNR 1 "19 Jan 1996"
+.SH NAME
+ansi2knr \- convert ANSI C to Kernighan & Ritchie C
+.SH SYNOPSIS
+.I ansi2knr
+[--varargs] input_file [output_file]
+.SH DESCRIPTION
+If no output_file is supplied, output goes to stdout.
+.br
+There are no error messages.
+.sp
+.I ansi2knr
+recognizes function definitions by seeing a non-keyword identifier at the left
+margin, followed by a left parenthesis, with a right parenthesis as the last
+character on the line, and with a left brace as the first token on the
+following line (ignoring possible intervening comments).  It will recognize a
+multi-line header provided that no intervening line ends with a left or right
+brace or a semicolon.  These algorithms ignore whitespace and comments, except
+that the function name must be the first thing on the line.
+.sp
+The following constructs will confuse it:
+.br
+     - Any other construct that starts at the left margin and follows the
+above syntax (such as a macro or function call).
+.br
+     - Some macros that tinker with the syntax of the function header.
+.sp
+The --varargs switch is obsolete, and is recognized only for
+backwards compatibility.  The present version of
+.I ansi2knr
+will always attempt to convert a ... argument to va_alist and va_dcl.
+.SH AUTHOR
+L. Peter Deutsch <ghost@aladdin.com> wrote the original ansi2knr and
+continues to maintain the current version; most of the code in the current
+version is his work.  ansi2knr also includes contributions by Francois
+Pinard <pinard@iro.umontreal.ca> and Jim Avera <jima@netcom.com>.

ansi2knr.c

@@ -1,27 +1,35 @@
-/* Copyright (C) 1989, 1991, 1993 Aladdin Enterprises. All rights reserved. */
-
 /* ansi2knr.c */
-/* Convert ANSI function declarations to K&R syntax */
 
-/*
-ansi2knr is distributed in the hope that it will be useful, but
-WITHOUT ANY WARRANTY.  No author or distributor accepts responsibility
-to anyone for the consequences of using it or for whether it serves any
-particular purpose or works at all, unless he says so in writing.  Refer
-to the GNU General Public License for full details.
+/* Convert ANSI C function definitions to K&R ("traditional C") syntax
+Copyright (C) 1989 Aladdin Enterprises.  All rights reserved.
+Copyright (C) 1988 Richard M. Stallman
 
-Everyone is granted permission to copy, modify and redistribute
-ansi2knr, but only under the conditions described in the GNU
-General Public License.  A copy of this license is supposed to have been
-given to you along with ansi2knr so you can know your rights and
-responsibilities.  It should be in a file named COPYING.  Among other
-things, the copyright notice and this notice must be preserved on all
-copies.
+ansi2knr is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY.  No author or distributor accepts responsibility to anyone for the
+consequences of using it or for whether it serves any particular purpose or
+works at all, unless he says so in writing.  Refer to the GNU General Public
+License (the "GPL") for full details.
+
+Everyone is granted permission to copy, modify and redistribute ansi2knr,
+but only under the conditions described in the GPL.  A copy of this license
+is supposed to have been given to you along with ansi2knr so you can know
+your rights and responsibilities.  It should be in a file named COPYLEFT.
+[In the LIBPNG distribution, the GPL appears below, not in a separate file.]
+Among other things, the copyright notice and this notice must be preserved
+on all copies.
+
+We explicitly state here what we believe is already implied by the GPL: if
+the ansi2knr program is distributed as a separate source file and a
+separate executable file which are aggregated on a storage medium together
+with another program, this in itself does not bring the other program under
+the GPL, nor does the mere fact that such a program or the procedures for
+constructing it invoke the ansi2knr executable bring any other part of the
+program under the GPL.
 */
 
 /*
----------- Here is the GNU GPL file COPYING, referred to above ----------
------ These terms do NOT apply to the JPEG software itself; see README ------
+---------- Here is the GNU GPL file COPYLEFT, referred to above ----------
+----- These terms do NOT apply to the LIBPNG software itself; see README ------
 
 		    GHOSTSCRIPT GENERAL PUBLIC LICENSE
 		    (Clarified 11 Feb 1988)
@@ -166,59 +174,142 @@ PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS) GHOSTSCRIPT, EVEN IF YOU
 HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, OR FOR ANY CLAIM
 BY ANY OTHER PARTY.
 
--------------------- End of file COPYING ------------------------------
+-------------------- End of file COPYLEFT ------------------------------
 */
 
-
-#include <stdio.h>
-#include <ctype.h>
-
-#ifdef BSD
-#include <strings.h>
-#else
-#ifdef VMS
-	extern int strlen(), strncmp();
-#else
-#include <string.h>
-#endif
-#endif
-
-/* malloc and free should be declared in stdlib.h, */
-/* but if you've got a K&R compiler, they probably aren't. */
-#ifdef MSDOS
-#include <malloc.h>
-#else
-#ifdef VMS
-     extern char *malloc();
-     extern void free();
-#else
-     extern char *malloc();
-     extern int free();
-#endif
-#endif
-
-/* Usage:
+/*
+ * Usage:
 	ansi2knr input_file [output_file]
  * If no output_file is supplied, output goes to stdout.
  * There are no error messages.
  *
- * ansi2knr recognizes functions by seeing a non-keyword identifier
- * at the left margin, followed by a left parenthesis,
- * with a right parenthesis as the last character on the line.
- * It will recognize a multi-line header provided that the last character
- * of the last line of the header is a right parenthesis,
- * and no intervening line ends with a left brace or a semicolon.
+ * ansi2knr recognizes function definitions by seeing a non-keyword
+ * identifier at the left margin, followed by a left parenthesis,
+ * with a right parenthesis as the last character on the line,
+ * and with a left brace as the first token on the following line
+ * (ignoring possible intervening comments).
+ * It will recognize a multi-line header provided that no intervening
+ * line ends with a left or right brace or a semicolon.
  * These algorithms ignore whitespace and comments, except that
  * the function name must be the first thing on the line.
  * The following constructs will confuse it:
  *	- Any other construct that starts at the left margin and
  *	    follows the above syntax (such as a macro or function call).
- *	- Macros that tinker with the syntax of the function header.
+ *	- Some macros that tinker with the syntax of the function header.
  */
 
+/*
+ * The original and principal author of ansi2knr is L. Peter Deutsch
+ * <ghost@aladdin.com>.  Other authors are noted in the change history
+ * that follows (in reverse chronological order):
+	lpd 96-01-21 added code to cope with not HAVE_CONFIG_H and with
+		compilers that don't understand void, as suggested by
+		Tom Lane
+	lpd 96-01-15 changed to require that the first non-comment token
+		on the line following a function header be a left brace,
+		to reduce sensitivity to macros, as suggested by Tom Lane
+		<tgl@sss.pgh.pa.us>
+	lpd 95-06-22 removed #ifndefs whose sole purpose was to define
+		undefined preprocessor symbols as 0; changed all #ifdefs
+		for configuration symbols to #ifs
+	lpd 95-04-05 changed copyright notice to make it clear that
+		including ansi2knr in a program does not bring the entire
+		program under the GPL
+	lpd 94-12-18 added conditionals for systems where ctype macros
+		don't handle 8-bit characters properly, suggested by
+		Francois Pinard <pinard@iro.umontreal.ca>;
+		removed --varargs switch (this is now the default)
+	lpd 94-10-10 removed CONFIG_BROKETS conditional
+	lpd 94-07-16 added some conditionals to help GNU `configure',
+		suggested by Francois Pinard <pinard@iro.umontreal.ca>;
+		properly erase prototype args in function parameters,
+		contributed by Jim Avera <jima@netcom.com>;
+		correct error in writeblanks (it shouldn't erase EOLs)
+	lpd 89-xx-xx original version
+ */
+
+/* Most of the conditionals here are to make ansi2knr work with */
+/* or without the GNU configure machinery. */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <stdio.h>
+#include <ctype.h>
+
+#if HAVE_CONFIG_H
+
+/*
+   For properly autoconfiguring ansi2knr, use AC_CONFIG_HEADER(config.h).
+   This will define HAVE_CONFIG_H and so, activate the following lines.
+ */
+
+# if STDC_HEADERS || HAVE_STRING_H
+#  include <string.h>
+# else
+#  include <strings.h>
+# endif
+
+#else /* not HAVE_CONFIG_H */
+
+/* Otherwise do it the hard way */
+
+# ifdef BSD
+#  include <strings.h>
+# else
+#  ifdef VMS
+    extern int strlen(), strncmp();
+#  else
+#   include <string.h>
+#  endif
+# endif
+
+#endif /* not HAVE_CONFIG_H */
+
+#if STDC_HEADERS
+# include <stdlib.h>
+#else
+/*
+   malloc and free should be declared in stdlib.h,
+   but if you've got a K&R compiler, they probably aren't.
+ */
+# ifdef MSDOS
+#  include <malloc.h>
+# else
+#  ifdef VMS
+     extern char *malloc();
+     extern void free();
+#  else
+     extern char *malloc();
+     extern int free();
+#  endif
+# endif
+
+#endif
+
+/*
+ * The ctype macros don't always handle 8-bit characters correctly.
+ * Compensate for this here.
+ */
+#ifdef isascii
+#  undef HAVE_ISASCII		/* just in case */
+#  define HAVE_ISASCII 1
+#else
+#endif
+#if STDC_HEADERS || !HAVE_ISASCII
+#  define is_ascii(c) 1
+#else
+#  define is_ascii(c) isascii(c)
+#endif
+
+#define is_space(c) (is_ascii(c) && isspace(c))
+#define is_alpha(c) (is_ascii(c) && isalpha(c))
+#define is_alnum(c) (is_ascii(c) && isalnum(c))
+
 /* Scanning macros */
-#define isidchar(ch) (isalnum(ch) || (ch) == '_')
-#define isidfirstchar(ch) (isalpha(ch) || (ch) == '_')
+#define isidchar(ch) (is_alnum(ch) || (ch) == '_')
+#define isidfirstchar(ch) (is_alpha(ch) || (ch) == '_')
 
 /* Forward references */
 char *skipspace();
@@ -227,6 +318,7 @@ int test1();
 int convert1();
 
 /* The main program */
+int
 main(argc, argv)
     int argc;
     char *argv[];
@@ -234,46 +326,99 @@ main(argc, argv)
 #define bufsize 5000			/* arbitrary size */
 	char *buf;
 	char *line;
+	char *more;
+	/*
+	 * In previous versions, ansi2knr recognized a --varargs switch.
+	 * If this switch was supplied, ansi2knr would attempt to convert
+	 * a ... argument to va_alist and va_dcl; if this switch was not
+	 * supplied, ansi2knr would simply drop any such arguments.
+	 * Now, ansi2knr always does this conversion, and we only
+	 * check for this switch for backward compatibility.
+	 */
+	int convert_varargs = 1;
+
+	if ( argc > 1 && argv[1][0] == '-' )
+	  {	if ( !strcmp(argv[1], "--varargs") )
+		  {	convert_varargs = 1;
+			argc--;
+			argv++;
+		  }
+		else
+		  {	fprintf(stderr, "Unrecognized switch: %s\n", argv[1]);
+			exit(1);
+		  }
+	  }
 	switch ( argc )
 	   {
 	default:
 		printf("Usage: ansi2knr input_file [output_file]\n");
 		exit(0);
 	case 2:
-		out = stdout; break;
+		out = stdout;
+		break;
 	case 3:
 		out = fopen(argv[2], "w");
 		if ( out == NULL )
-		   {	fprintf(stderr, "Cannot open %s\n", argv[2]);
+		   {	fprintf(stderr, "Cannot open output file %s\n", argv[2]);
 			exit(1);
 		   }
 	   }
 	in = fopen(argv[1], "r");
 	if ( in == NULL )
-	   {	fprintf(stderr, "Cannot open %s\n", argv[1]);
+	   {	fprintf(stderr, "Cannot open input file %s\n", argv[1]);
 		exit(1);
 	   }
 	fprintf(out, "#line 1 \"%s\"\n", argv[1]);
 	buf = malloc(bufsize);
 	line = buf;
 	while ( fgets(line, (unsigned)(buf + bufsize - line), in) != NULL )
-	   {	switch ( test1(buf) )
+	   {
+test:		line += strlen(line);
+		switch ( test1(buf) )
 		   {
+		case 2:			/* a function header */
+			convert1(buf, out, 1, convert_varargs);
+			break;
 		case 1:			/* a function */
-			convert1(buf, out);
+			/* Check for a { at the start of the next line. */
+			more = ++line;
+f:			if ( line >= buf + (bufsize - 1) ) /* overflow check */
+			  goto wl;
+			if ( fgets(line, (unsigned)(buf + bufsize - line), in) == NULL )
+			  goto wl;
+			switch ( *skipspace(more, 1) )
+			  {
+			  case '{':
+			    /* Definitely a function header. */
+			    convert1(buf, out, 0, convert_varargs);
+			    fputs(more, out);
+			    break;
+			  case 0:
+			    /* The next line was blank or a comment: */
+			    /* keep scanning for a non-comment. */
+			    line += strlen(line);
+			    goto f;
+			  default:
+			    /* buf isn't a function header, but */
+			    /* more might be. */
+			    fputs(buf, out);
+			    strcpy(buf, more);
+			    line = buf;
+			    goto test;
+			  }
 			break;
 		case -1:		/* maybe the start of a function */
-			line = buf + strlen(buf);
 			if ( line != buf + (bufsize - 1) ) /* overflow check */
-				continue;
+			  continue;
 			/* falls through */
 		default:		/* not a function */
-			fputs(buf, out);
+wl:			fputs(buf, out);
 			break;
 		   }
 		line = buf;
 	   }
-	if ( line != buf ) fputs(buf, out);
+	if ( line != buf )
+	  fputs(buf, out);
 	free(buf);
 	fclose(out);
 	fclose(in);
@@ -286,11 +431,14 @@ skipspace(p, dir)
     register char *p;
     register int dir;			/* 1 for forward, -1 for backward */
 {	for ( ; ; )
-	   {	while ( isspace(*p) ) p += dir;
-		if ( !(*p == '/' && p[dir] == '*') ) break;
+	   {	while ( is_space(*p) )
+		  p += dir;
+		if ( !(*p == '/' && p[dir] == '*') )
+		  break;
 		p += dir;  p += dir;
 		while ( !(*p == '*' && p[dir] == '/') )
-		   {	if ( *p == 0 ) return p;	/* multi-line comment?? */
+		   {	if ( *p == 0 )
+			  return p;	/* multi-line comment?? */
 			p += dir;
 		   }
 		p += dir;  p += dir;
@@ -300,13 +448,16 @@ skipspace(p, dir)
 
 /*
  * Write blanks over part of a string.
+ * Don't overwrite end-of-line characters.
  */
 int
 writeblanks(start, end)
     char *start;
     char *end;
 {	char *p;
-	for ( p = start; p < end; p++ ) *p = ' ';
+	for ( p = start; p < end; p++ )
+	  if ( *p != '\r' && *p != '\n' )
+	    *p = ' ';
 	return 0;
 }
 
@@ -316,8 +467,12 @@ writeblanks(start, end)
  * Return as follows:
  *	0 - definitely not a function definition;
  *	1 - definitely a function definition;
+ *	2 - definitely a function prototype (NOT USED);
  *	-1 - may be the beginning of a function definition,
  *		append another line and look again.
+ * The reason we don't attempt to convert function prototypes is that
+ * Ghostscript's declaration-generating macros look too much like
+ * prototypes, and confuse the algorithms.
  */
 int
 test1(buf)
@@ -326,24 +481,27 @@ test1(buf)
 	char *bend;
 	char *endfn;
 	int contin;
+
 	if ( !isidfirstchar(*p) )
-		return 0;		/* no name at left margin */
+	  return 0;		/* no name at left margin */
 	bend = skipspace(buf + strlen(buf) - 1, -1);
 	switch ( *bend )
 	   {
-	case ')': contin = 1; break;
-	case '{':
-	case ';': return 0;		/* not a function */
-	default: contin = -1;
+	   case ';': contin = 0 /*2*/; break;
+	   case ')': contin = 1; break;
+	   case '{': return 0;		/* not a function */
+	   case '}': return 0;		/* not a function */
+	   default: contin = -1;
 	   }
-	while ( isidchar(*p) ) p++;
+	while ( isidchar(*p) )
+	  p++;
 	endfn = p;
 	p = skipspace(p, 1);
 	if ( *p++ != '(' )
-		return 0;		/* not a function */
+	  return 0;		/* not a function */
 	p = skipspace(p, 1);
 	if ( *p == ')' )
-		return 0;		/* no parameters */
+	  return 0;		/* no parameters */
 	/* Check that the apparent function name isn't a keyword. */
 	/* We only need to check for keywords that could be followed */
 	/* by a left parenthesis (which, unfortunately, is most of them). */
@@ -357,19 +515,23 @@ test1(buf)
 		char **key = words;
 		char *kp;
 		int len = endfn - buf;
+
 		while ( (kp = *key) != 0 )
 		   {	if ( strlen(kp) == len && !strncmp(kp, buf, len) )
-				return 0;	/* name is a keyword */
+			  return 0;	/* name is a keyword */
 			key++;
 		   }
 	   }
 	return contin;
 }
 
+/* Convert a recognized function definition or header to K&R syntax. */
 int
-convert1(buf, out)
+convert1(buf, out, header, convert_varargs)
     char *buf;
     FILE *out;
+    int header;			/* Boolean */
+    int convert_varargs;	/* Boolean */
 {	char *endfn;
 	register char *p;
 	char **breaks;
@@ -377,9 +539,12 @@ convert1(buf, out)
 	char **btop;
 	char **bp;
 	char **ap;
+	char *vararg = 0;
+
 	/* Pre-ANSI implementations don't agree on whether strchr */
 	/* is called strchr or index, so we open-code it here. */
-	for ( endfn = buf; *(endfn++) != '('; ) ;
+	for ( endfn = buf; *(endfn++) != '('; )
+	  ;
 top:	p = endfn;
 	breaks = (char **)malloc(sizeof(char *) * num_breaks * 2);
 	if ( breaks == 0 )
@@ -393,7 +558,10 @@ top:	p = endfn;
 	/* Parse the argument list */
 	do
 	   {	int level = 0;
+		char *lp = NULL;
+		char *rp;
 		char *end = NULL;
+
 		if ( bp >= btop )
 		   {	/* Filled up break table. */
 			/* Allocate a bigger one and start over. */
@@ -406,13 +574,27 @@ top:	p = endfn;
 		for ( ; end == NULL; p++ )
 		   {	switch(*p)
 			   {
-			case ',': if ( !level ) end = p; break;
-			case '(': level++; break;
-			case ')': if ( --level < 0 ) end = p; break;
-			case '/': p = skipspace(p, 1) - 1; break;
-			default: ;
+			   case ',':
+				if ( !level ) end = p;
+				break;
+			   case '(':
+				if ( !level ) lp = p;
+				level++;
+				break;
+			   case ')':
+				if ( --level < 0 ) end = p;
+				else rp = p;
+				break;
+			   case '/':
+				p = skipspace(p, 1) - 1;
+				break;
+			   default:
+				;
 			   }
 		   }
+		/* Erase any embedded prototype parameters. */
+		if ( lp )
+		  writeblanks(lp + 1, rp);
 		p--;			/* back up over terminator */
 		/* Find the name being declared. */
 		/* This is complicated because of procedure and */
@@ -421,35 +603,42 @@ top:	p = endfn;
 		   {	p = skipspace(p - 1, -1);
 			switch ( *p )
 			   {
-			case ']':	/* skip array dimension(s) */
-			case ')':	/* skip procedure args OR name */
+			   case ']':	/* skip array dimension(s) */
+			   case ')':	/* skip procedure args OR name */
 			   {	int level = 1;
 				while ( level )
 				 switch ( *--p )
 				   {
-				case ']': case ')': level++; break;
-				case '[': case '(': level--; break;
-				case '/': p = skipspace(p, -1) + 1; break;
-				default: ;
+				   case ']': case ')': level++; break;
+				   case '[': case '(': level--; break;
+				   case '/': p = skipspace(p, -1) + 1; break;
+				   default: ;
 				   }
 			   }
 				if ( *p == '(' && *skipspace(p + 1, 1) == '*' )
 				   {	/* We found the name being declared */
 					while ( !isidfirstchar(*p) )
-						p = skipspace(p, 1) + 1;
+					  p = skipspace(p, 1) + 1;
 					goto found;
 				   }
 				break;
-			default: goto found;
+			   default:
+				goto found;
 			   }
 		   }
 found:		if ( *p == '.' && p[-1] == '.' && p[-2] == '.' )
-		   {	p++;
-			if ( bp == breaks + 1 )	/* sole argument */
-				writeblanks(breaks[0], p);
+		  {	if ( convert_varargs )
+			  {	*bp++ = "va_alist";
+				vararg = p-2;
+			  }
 			else
-				writeblanks(bp[-1] - 1, p);
-			bp--;
+			  {	p++;
+				if ( bp == breaks + 1 )	/* sole argument */
+				  writeblanks(breaks[0], p);
+				else
+				  writeblanks(bp[-1] - 1, p);
+				bp--;
+			  }
 		   }
 		else
 		   {	while ( isidchar(*p) ) p--;
@@ -470,19 +659,37 @@ found:		if ( *p == '.' && p[-1] == '.' && p[-2] == '.' )
 			   }
 		   }
 	   }
-	/* Put out the function name */
+	/* Put out the function name and left parenthesis. */
 	p = buf;
 	while ( p != endfn ) putc(*p, out), p++;
-	/* Put out the declaration */
-	for ( ap = breaks+1; ap < bp; ap += 2 )
-	   {	p = *ap;
-		while ( isidchar(*p) ) putc(*p, out), p++;
-		if ( ap < bp - 1 ) fputs(", ", out);
-	   }
-	fputs(")  ", out);
-	/* Put out the argument declarations */
-	for ( ap = breaks+2; ap <= bp; ap += 2 ) (*ap)[-1] = ';';
-	fputs(breaks[0], out);
+	/* Put out the declaration. */
+	if ( header )
+	  {	fputs(");", out);
+		for ( p = breaks[0]; *p; p++ )
+		  if ( *p == '\r' || *p == '\n' )
+		    putc(*p, out);
+	  }
+	else
+	  {	for ( ap = breaks+1; ap < bp; ap += 2 )
+		  {	p = *ap;
+			while ( isidchar(*p) )
+			  putc(*p, out), p++;
+			if ( ap < bp - 1 )
+			  fputs(", ", out);
+		  }
+		fputs(")  ", out);
+		/* Put out the argument declarations */
+		for ( ap = breaks+2; ap <= bp; ap += 2 )
+		  (*ap)[-1] = ';';
+		if ( vararg != 0 )
+		  {	*vararg = 0;
+			fputs(breaks[0], out);		/* any prior args */
+			fputs("va_dcl", out);		/* the final arg */
+			fputs(bp[0], out);
+		  }
+		else
+		  fputs(breaks[0], out);
+	  }
 	free((char *)breaks);
 	return 0;
 }

example.c

@@ -1,3 +1,4 @@
+
 /* example.c - an example of using libpng */
 
 /* This is an example of how to use libpng to read and write PNG files.
@@ -12,9 +13,9 @@
  * working PNG reader/writer, see pngtest.c, included in this distribution.
  */
 
-#include <png.h>
+#include "png.h"
 
-/* Check to see if a file is a PNG file using png_check_sig().  Returns
+/* Check to see if a file is a PNG file using png_sig_cmp().  Returns
  * non-zero if the image is a PNG, and 0 if it isn't a PNG.
  *
  * If this call is successful, and you are going to keep the file open,
@@ -28,7 +29,7 @@
  *
  * Many applications already read the first 2 or 4 bytes from the start
  * of the image to determine the file type, so it would be easiest just
- * to pass the bytes to png_check_sig() or even skip that if you know
+ * to pass the bytes to png_sig_cmp() or even skip that if you know
  * you have a PNG file, and call png_set_sig_bytes().
  */
 #define PNG_BYTES_TO_CHECK 4
@@ -45,7 +46,7 @@ int check_if_png(char *file_name, FILE **fp)
       return 0;
 
    /* Compare the first PNG_BYTES_TO_CHECK bytes of the signature. */
-   return(png_check_sig(buf, PNG_BYTES_TO_CHECK));
+   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
@@ -54,7 +55,7 @@ int check_if_png(char *file_name, FILE **fp)
  * file, and the other where we are given an open file (possibly with
  * some or all of the magic bytes read - see comments above).
  */
-**** prototype 1 ****
+#ifdef open_file /* prototype 1 */
 void read_png(char *file_name)  /* We need to open the file */
 {
    png_structp png_ptr;
@@ -66,14 +67,14 @@ void read_png(char *file_name)  /* We need to open the file */
 
    if ((fp = fopen(file_name, "rb")) == NULL)
       return;
-**** prototype 2 ****
+#else no_open_file /* prototype 2 */
 void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
 {
    png_structp png_ptr;
    png_infop info_ptr;
    png_uint_32 width, height;
    int bit_depth, color_type, interlace_type;
-**** only use one prototype! ****
+#endif no_open_file /* only use one prototype! */
 
    /* Create and initialize the png_struct with the desired error handler
     * functions.  If you want to use the default stderr and longjump method,
@@ -82,7 +83,7 @@ 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)
    {
@@ -91,7 +92,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
    }
 
    /* Allocate/initialize the memory for image information.  REQUIRED. */
-   info_ptr = png_create_info_struct();
+   info_ptr = png_create_info_struct(png_ptr);
    if (info_ptr == NULL)
    {
       fclose(fp);
@@ -113,20 +114,20 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
    }
 
    /* One of the following I/O initialization methods is REQUIRED */
-**** PNG file I/O method 1 ****
+#ifdef streams /* PNG file I/O method 1 */
    /* Set up the input control if you are using standard C streams */
    png_init_io(png_ptr, fp);
 
-**** PNG file I/O method 2 ****
+#else no_streams /* PNG file I/O method 2 */
    /* If you are using replacement read functions, instead of calling
     * png_init_io() here you would call:
     */
    png_set_read_fn(png_ptr, (void *)user_io_ptr, user_read_fn);
    /* where user_io_ptr is a structure you want available to the callbacks */
-**** Use only one I/O method! ****
+#endif no_streams /* Use only one I/O method! */
 
    /* If we have already read some of the signature */
-   png_set_sig_bytes_read(png_ptr, sig_read);
+   png_set_sig_bytes(png_ptr, sig_read);
 
    /* The call to png_read_info() gives us all of the information from the
     * PNG file before the first IDAT (image data chunk).  REQUIRED
@@ -180,29 +181,32 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
     * use it - you should use the (solid) application background if it has one.
     */
 
-   png_color_16 my_background, *image_background);
+   png_color_16 my_background, *image_background;
 
-   if (png_get_bKGD(png_ptr, info_ptr, &image_background);
-      png_set_background(png_ptr, image_background),
+   if (png_get_bKGD(png_ptr, info_ptr, &image_background))
+      png_set_background(png_ptr, image_background,
                          PNG_BACKGROUND_GAMMA_FILE, 1, 1.0);
    else
       png_set_background(png_ptr, &my_background,
                          PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0);
 
    /* Some suggestions as to how to get a screen gamma value */
+
+   /* Note that screen gamma is (display_gamma/viewing_gamma) */
    if (/* We have a user-defined screen gamma value */)
    {
       screen_gamma = user-defined screen_gamma;
    }
    /* This is one way that applications share the same screen gamma value */
-   else if ((gamma_str = getenv("DISPLAY_GAMMA")) != NULL)
+   else if ((gamma_str = getenv("SCREEN_GAMMA")) != NULL)
    {
       screen_gamma = atof(gamma_str);
    }
    /* If we don't have another value */
    else
    {
-      screen_gamma = 2.2;  /* A good guess for PC monitors */
+      screen_gamma = 2.2;  /* A good guess for a PC monitors in a dimly
+                              lit room */
       screen_gamma = 1.7 or 1.0;  /* A good guess for Mac systems */
    }
 
@@ -211,13 +215,16 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
     * by the user at run time by the user.  It is strongly suggested that
     * your application support gamma correction.
     */
-   if (png_get_sRGB(png_ptr, info_ptr, &srgb_intent)
-      png_set_sRGB(png_ptr, srgb_intent, 0);
+
+   int intent;
+
+   if (png_get_sRGB(png_ptr, info_ptr, &intent))
+      png_set_sRGB(png_ptr, intent, 0);
    else 
-      if (png_get_gAMA(png_ptr, info_ptr, &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, 0.45);
+         png_set_gamma(png_ptr, screen_gamma, 0.50);
 
    /* Dither RGB files down to 8 bit palette or reduce palettes
     * to the number of colors available on your screen.
@@ -228,7 +235,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
       png_colorp palette;
 
       /* This reduces the image to the application supplied palette */
-      if (we have our own palette)
+      if (/* we have our own palette */)
       {
          /* An array of colors to which the image should be dithered */
          png_color std_color_cube[MAX_SCREEN_COLORS];
@@ -237,7 +244,7 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
             MAX_SCREEN_COLORS, 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)))
+      else if (png_get_PLTE(png_ptr, info_ptr, &palette, &num_palette))
       {
          png_color16p histogram;
 
@@ -249,7 +256,7 @@ 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 */
-   png_set_invert(png_ptr);
+   png_set_invert_mono(png_ptr);
 
    /* If you want to shift the pixel values from the range [0,255] or
     * [0,65535] to the original [0,7] or [0,31], or whatever range the
@@ -298,37 +305,37 @@ void read_png(FILE *fp, unsigned int sig_read)  /* file is already open */
    }
 
    /* Now it's time to read the image.  One of these methods is REQUIRED */
-**** Read the entire image in one go ****
+#ifdef entire /* Read the entire image in one go */
    png_read_image(png_ptr, row_pointers);
 
-**** Read the image one or more scanlines at a time ****
+#else no_entire /* Read the image one or more scanlines at a time */
    /* The other way to read images - deal with interlacing: */
 
    for (pass = 0; pass < number_passes; pass++)
    {
-[[[[[[[ Read the image a single row at a time ]]]]]]]
+#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, NULL, 1);
       }
 
-[[[[[[[ Read the image several rows at a time ]]]]]]]
+#else no_single /* Read the image several rows at a time */
       for (y = 0; y < height; y += number_of_rows)
       {
-<<<<<<<<<< Read the image using the "sparkle" effect. >>>>>>>>>>
+#ifdef sparkle /* Read the image using the "sparkle" effect. */
          png_read_rows(png_ptr, row_pointers, NULL, number_of_rows);
         
-<<<<<<<<<< Read the image using the "rectangle" effect >>>>>>>>>>
+#else no_sparkle /* Read the image using the "rectangle" effect */
          png_read_rows(png_ptr, NULL, row_pointers, number_of_rows);
-<<<<<<<<<< use only one of these two methods >>>>>>>>>>
+#endif no_sparkle /* use only one of these two methods */
       }
      
       /* if you want to display the image after every pass, do
          so here */
-[[[[[[[ use only one of these two methods ]]]]]]]
+#endif no_single /* use only one of these two methods */
    }
-**** use only one of these two methods ****
+#endif no_entire /* use only one of these two methods */
 
    /* read rest of file, and get additional chunks in info_ptr - REQUIRED */
    png_read_end(png_ptr, info_ptr);
@@ -355,7 +362,7 @@ 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)
    {
@@ -473,7 +480,7 @@ end_callback(png_structp png_ptr, png_infop info)
 }
 
 /* write a png file */
-void write_png(char *file_name, ... other image information ...)
+void write_png(char *file_name /* , ... other image information ... */)
 {
    FILE *fp;
    png_structp png_ptr;
@@ -491,7 +498,7 @@ 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)
    {
@@ -520,16 +527,16 @@ void write_png(char *file_name, ... other image information ...)
    }
 
    /* One of the following I/O initialization functions is REQUIRED */
-**** I/O initialization method 1 ****
+#ifdef streams /* I/O initialization method 1 */
    /* set up the output control if you are using standard C streams */
    png_init_io(png_ptr, fp);
-**** I/O initialization method 2 ****
+#else no_streams /* I/O initialization method 2 */
    /* If you are using replacement read functions, instead of calling
     * png_init_io() here you would call */
    png_set_write_fn(png_ptr, (void *)user_io_ptr, user_write_fn,
       user_IO_flush_function);
    /* where user_io_ptr is a structure you want available to the callbacks */
-**** only use 1 initialization method ****
+#endif no_streams /* only use one initialization method */
 
    /* 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
@@ -543,8 +550,8 @@ 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_malloc(png_ptr, 256 * sizeof (png_color));
-   ... set palette colors ...
+   palette = (png_colorp)png_malloc(png_ptr, 256 * sizeof (png_color));
+   /* ... set palette colors ... */
    png_set_PLTE(png_ptr, info_ptr, palette, 256);
 
    /* optional significant bit chunk */
@@ -594,7 +601,7 @@ void write_png(char *file_name, ... other image information ...)
     */
 
    /* invert monocrome pixels */
-   png_set_invert(png_ptr);
+   png_set_invert_mono(png_ptr);
 
    /* Shift the pixels up to a legal bit depth and fill in
     * as appropriate to correctly scale the image.
@@ -634,12 +641,12 @@ void write_png(char *file_name, ... other image information ...)
    png_byte row_pointers[height][width];
 
    /* One of the following output methods is REQUIRED */
-**** write out the entire image data in one call ***
+#ifdef entire /* write out the entire image data in one call */
    png_write_image(png_ptr, row_pointers);
 
    /* the other way to write the image - deal with interlacing */
 
-**** write out the image data by one or more scanlines ****
+#else no_entire /* write out the image data by one or more scanlines */
    /* The number of passes is either 1 for non-interlaced images,
     * or 7 for interlaced images.
     */
@@ -655,7 +662,7 @@ void write_png(char *file_name, ... other image information ...)
          png_write_rows(png_ptr, &row_pointers, 1);
       }
    }
-**** use only one output method ****
+#endif no_entire /* use only one output method */
 
    /* You can write optional chunks like tEXt, zTXt, and tIME at the end
     * as well.

libpngpf.3

@@ -0,0 +1,342 @@
+.TH LIBPNGPF 3 "May 9, 1998"
+.SH NAME
+libpng \- Portable Network Graphics (PNG) Reference Library
+(private functions)
+.SH SYNOPSIS
+#include <png.h>
+
+void png_build_gamma_table (png_structp png_ptr);
+
+void png_build_grayscale_palette (int bit_depth, png_colorp
+palette);
+
+void png_calculate_crc (png_structp png_ptr, png_bytep ptr,
+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
+key, png_charpp new_key);
+
+void png_combine_row (png_structp png_ptr, png_bytep row, int
+mask);
+
+void png_correct_palette (png_structp png_ptr, png_colorp
+palette, int num_palette);
+
+int png_crc_error (png_structp png_ptr);
+
+int png_crc_finish (png_structp png_ptr, png_uint_32 skip);
+
+void png_crc_read (png_structp png_ptr, png_bytep buf,
+png_size_t length);
+
+png_voidp png_create_struct (int type);
+
+void png_destroy_struct (png_voidp struct_ptr);
+
+void png_do_background (png_row_infop row_info, png_bytep row,
+png_color_16p trans_values, png_color_16p background,
+png_color_16p background_1, png_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);
+
+void png_do_chop (png_row_infop row_info, png_bytep row);
+
+void png_do_dither (png_row_infop row_info, png_bytep row,
+png_bytep palette_lookup, png_bytep dither_lookup);
+
+void png_do_expand (png_row_infop row_info, png_bytep row,
+png_color_16p trans_value);
+
+void png_do_expand_palette (png_row_infop row_info, png_bytep
+row, png_colorp palette, png_bytep trans, int num_trans);
+
+void png_do_gamma (png_row_infop row_info, png_bytep row,
+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
+row);
+
+void png_do_invert (png_row_infop row_info, png_bytep row);
+
+void png_do_pack (png_row_infop row_info, png_bytep row,
+png_uint_32 bit_depth);
+
+void png_do_packswap (png_row_infop row_info, png_bytep row);
+
+void png_do_read_filler (png_row_infop row_info, png_bytep row,
+png_uint_32 filler, png_uint_32 flags);
+
+void png_do_read_interlace (png_row_infop row_info, png_bytep
+row, int pass, png_uint_32 transformations);
+
+void png_do_read_invert_alpha (png_row_infop row_info,
+png_bytep row);
+
+void png_do_read_swap_alpha (png_row_infop row_info, png_bytep
+row);
+
+void png_do_read_transformations (png_structp png_ptr);
+
+void png_do_rgb_to_gray (png_row_infop row_info, png_bytep
+row);
+
+void png_do_shift (png_row_infop row_info, png_bytep row,
+png_color_8p bit_depth);
+
+void png_do_strip_filler (png_row_infop row_info, png_bytep
+row, png_uint_32 flags);
+
+void png_do_swap (png_row_infop row_info, png_bytep row);
+
+void png_do_unpack (png_row_infop row_info, png_bytep row);
+
+void png_do_unshift (png_row_infop row_info, png_bytep row,
+png_color_8p sig_bits);
+
+void png_do_write_interlace (png_row_infop row_info, png_bytep
+row, int pass);
+
+void png_do_write_invert_alpha (png_row_infop row_info,
+png_bytep row);
+
+void png_do_write_swap_alpha (png_row_infop row_info, png_bytep
+row);
+
+void png_do_write_transformations (png_structp png_ptr);
+
+void *png_far_to_near (png_structp png_ptr,png_voidp ptr,
+int check);
+
+void png_flush (png_structp png_ptr);
+
+png_int_32 png_get_int_32 (png_bytep buf);
+
+png_uint_16 png_get_uint_16 (png_bytep buf);
+
+png_uint_32 png_get_uint_32 (png_bytep buf);
+
+void png_handle_bKGD (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_cHRM (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_gAMA (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_hIST (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_IEND (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_IHDR (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_oFFs (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_pCAL (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_pHYs (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_PLTE (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_sBIT (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_sRGB (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_tEXt (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_tIME (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_tRNS (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_handle_unknown (png_structp png_ptr, png_infop
+info_ptr, png_uint_32 length);
+
+void png_handle_zTXt (png_structp png_ptr, png_infop info_ptr,
+png_uint_32 length);
+
+void png_info_destroy (png_structp png_ptr, png_infop
+info_ptr);
+
+void png_init_read_transformations (png_structp png_ptr);
+
+void png_process_IDAT_data (png_structp png_ptr, png_bytep
+buffer, png_size_t buffer_length);
+
+void png_process_some_data (png_structp png_ptr, png_infop
+info_ptr);
+
+void png_push_check_crc (png_structp png_ptr);
+
+void png_push_crc_finish (png_structp png_ptr);
+
+void png_push_crc_skip (png_structp png_ptr, png_uint_32
+length);
+
+void png_push_fill_buffer (png_structp png_ptr, png_bytep
+buffer, png_size_t length);
+
+void png_push_handle_tEXt (png_structp png_ptr, png_infop
+info_ptr, png_uint_32 length);
+
+void png_push_handle_unknown (png_structp png_ptr, png_infop
+info_ptr, png_uint_32 length);
+
+void png_push_handle_zTXt (png_structp png_ptr, png_infop
+info_ptr, png_uint_32 length);
+
+void png_push_have_end (png_structp png_ptr, png_infop
+info_ptr);
+
+void png_push_have_info (png_structp png_ptr, png_infop
+info_ptr);
+
+void png_push_have_row (png_structp png_ptr, png_bytep row);
+
+void png_push_process_row (png_structp png_ptr);
+
+void png_push_read_chunk (png_structp png_ptr, png_infop
+info_ptr);
+
+void png_push_read_end (png_structp png_ptr, png_infop
+info_ptr);
+
+void png_push_read_IDAT (png_structp png_ptr);
+
+void png_push_read_sig (png_structp png_ptr, png_infop
+info_ptr);
+
+void png_push_read_tEXt (png_structp png_ptr, png_infop
+info_ptr);
+
+void png_push_read_zTXt (png_structp png_ptr, png_infop
+info_ptr);
+
+void png_push_restore_buffer (png_structp png_ptr, png_bytep
+buffer, png_size_t buffer_length);
+
+void png_push_save_buffer (png_structp png_ptr);
+
+void png_read_data (png_structp png_ptr, png_bytep data,
+png_size_t length);
+
+void png_read_filter_row (png_structp png_ptr, png_row_infop
+row_info, png_bytep row, png_bytep prev_row, int filter);
+
+void png_read_finish_row (png_structp png_ptr);
+
+void png_read_init (png_structp png_ptr);
+
+void png_read_push_finish_row (png_structp png_ptr);
+
+void png_read_start_row (png_structp png_ptr);
+
+void png_read_transform_info (png_structp png_ptr, png_infop
+info_ptr);
+
+void png_reset_crc (png_structp png_ptr);
+
+void png_save_int_32 (png_bytep buf, png_int_32 i);
+
+void png_save_uint_16 (png_bytep buf, unsigned int i);
+
+void png_save_uint_32 (png_bytep buf, png_uint_32 i);
+
+void png_write_bKGD (png_structp png_ptr, png_color_16p values,
+int color_type);
+
+void png_write_cHRM (png_structp png_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);
+
+void png_write_data (png_structp png_ptr, png_bytep data,
+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
+row_info);
+
+void png_write_finish_row (png_structp png_ptr);
+
+void png_write_gAMA (png_structp png_ptr, double file_gamma);
+
+void png_write_hIST (png_structp png_ptr, png_uint_16p hist,
+int num_hist);
+
+void png_write_init (png_structp png_ptr);
+
+void png_write_IDAT (png_structp png_ptr, png_bytep data,
+png_size_t length);
+
+void png_write_IEND (png_structp png_ptr);
+
+void png_write_IHDR (png_structp png_ptr, png_uint_32 width,
+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,
+png_uint_32 y_offset, int unit_type);
+
+void png_write_pCAL (png_structp png_ptr, png_charp purpose,
+png_int_32 X0, png_int_32 X1, int type, int nparams, png_charp
+units, png_charpp params);
+
+void png_write_pHYs (png_structp png_ptr, png_uint_32
+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,
+png_uint_32 num_pal);
+
+void png_write_sBIT (png_structp png_ptr, png_color_8p sbit,
+int color_type);
+
+void png_write_sig (png_structp png_ptr);
+
+void png_write_sRGB (png_structp png_ptr, int intent);
+
+void png_write_start_row (png_structp png_ptr);
+
+void png_write_tEXt (png_structp png_ptr, png_charp key,
+png_charp text, png_size_t text_len);
+
+void png_write_tIME (png_structp png_ptr, png_timep mod_time);
+
+void png_write_tRNS (png_structp png_ptr, png_bytep trans,
+png_color_16p values, int number, int color_type);
+
+void png_write_zTXt (png_structp png_ptr, png_charp key,
+png_charp text, png_size_t text_len, int compression);
+
+voidpf png_zalloc (voidpf png_ptr, uInt items, uInt size);
+
+void png_zfree (voidpf png_ptr, voidpf ptr);
+
+.SH DESCRIPTION
+The functions listed above are used privately by libpng
+and are not recommended for use by applications.  They
+are listed alphabetically here as an aid to libpng maintainers.
+See png.h for more information on these functions.
+
+.SH SEE ALSO
+libpng(3), png(5)
+.SH AUTHOR
+Glenn Randers-Pehrson

png.5

@@ -0,0 +1,44 @@
+.TH PNG 5 "May 9, 1998"
+.SH NAME
+png \- Portable Network Graphics (PNG) format
+.SH DESCRIPTION
+PNG (Portable Network Graphics) is an extensible file format for the
+lossless, portable, well-compressed storage of raster images. PNG provides
+a patent-free replacement for GIF and can also replace many
+common uses of TIFF. Indexed-color, grayscale, and truecolor images are
+supported, plus an optional alpha channel. Sample depths range from
+1 to 16 bits. 
+.br
+
+PNG is designed to work well in online viewing applications, such as the
+World Wide Web, so it is fully streamable with a progressive display
+option. PNG is robust, providing both full file integrity checking and
+fast, simple detection of common transmission errors. Also, PNG can store
+gamma and chromaticity data for improved color matching on heterogeneous
+platforms. 
+
+.SH "SEE ALSO"
+.IR libpng(3), zlib(3), deflate(5), and zlib(5)
+.LP
+PNG specification:
+RFC 2083
+.IP
+.br
+ftp://ds.internic.net/rfc/rfc2083.txt
+.br
+or (as a W3C Recommendation) at
+.br
+http://www.w3.org/TR/REC-png.html
+.SH AUTHORS
+This man page: Glenn Randers-Pehrson
+.LP
+Portable Network Graphics (PNG) Specification Version 1.0 (October 1, 1996):
+Thomas Boutell and others (png-list@dworkin.wustl.edu).
+.LP
+
+.SH COPYRIGHT NOTICE
+The PNG specification is copyright (c) 1996 Massachussets Institute of
+Technology.  See the specification for conditions of use and distribution.
+.LP
+.\" end of man page
+

png.c

@@ -1,12 +1,12 @@
 
 /* png.c - location for general purpose libpng functions
  *
- * libpng 0.97
+ * libpng 1.0.1c
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * January 7, 1998
+ * May 9, 1998
  */
 
 #define PNG_INTERNAL
@@ -16,9 +16,9 @@
 /* Version information for C files.  This had better match the version
  * string defined in png.h.
  */
-char png_libpng_ver[] = "0.97";
+char png_libpng_ver[12] = "1.0.1c";
 
-/* Place to hold the signiture string for a PNG file. */
+/* Place to hold the signature string for a PNG file. */
 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,
@@ -103,15 +103,15 @@ png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check)
    if (num_to_check > 8)
       num_to_check = 8;
    else if (num_to_check < 1)
-      return 0;
+      return (0);
 
    if (start > 7)
-      return 0;
+      return (0);
 
    if (start + num_to_check > 8)
       num_to_check = 8 - start;
 
-   return (png_memcmp(&sig[start], &png_sig[start], num_to_check));
+   return ((int)(png_memcmp(&sig[start], &png_sig[start], num_to_check)));
 }
 
 /* (Obsolete) function to check signature bytes.  It does not allow one
@@ -121,7 +121,7 @@ png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check)
 int
 png_check_sig(png_bytep sig, int num)
 {
-  return !png_sig_cmp(sig, (png_size_t)0, (png_size_t)num);
+  return ((int)!png_sig_cmp(sig, (png_size_t)0, (png_size_t)num));
 }
 
 /* Function to allocate memory for zlib. */
@@ -132,7 +132,7 @@ png_zalloc(voidpf png_ptr, uInt items, uInt size)
    png_uint_32 num_bytes;
 
    num_bytes = (png_uint_32)items * size;
-   ptr = png_malloc((png_structp)png_ptr, num_bytes);
+   ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes);
    if (num_bytes > (png_uint_32)0x8000)
    {
       png_memset(ptr, 0, (png_size_t)0x8000L);
@@ -143,7 +143,7 @@ png_zalloc(voidpf png_ptr, uInt items, uInt size)
    {
       png_memset(ptr, 0, (png_size_t)num_bytes);
    }
-   return (voidpf)(ptr);
+   return ((voidpf)ptr);
 }
 
 /* function to free memory for zlib */
@@ -185,7 +185,7 @@ png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length)
    }
 
    if (need_crc)
-      png_ptr->crc = crc32(png_ptr->crc, ptr, length);
+      png_ptr->crc = crc32(png_ptr->crc, ptr, (uInt)length);
 }
 
 /* Allocate the memory for an info_struct for the application.  We don't
@@ -200,12 +200,13 @@ 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)
    {
       png_info_init(info_ptr);
    }
 
-   return info_ptr;
+   return (info_ptr);
 }
 
 /* This function frees the memory associated with a single info struct.
@@ -268,7 +269,7 @@ png_info_destroy(png_structp png_ptr, png_infop info_ptr)
    png_free(png_ptr, info_ptr->pcal_units);
    if (info_ptr->pcal_params != NULL)
    {
-      for (i = 0; i < info_ptr->pcal_nparams; i++)
+      for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
       {
          png_free(png_ptr, info_ptr->pcal_params[i]);
       }
@@ -286,7 +287,7 @@ png_info_destroy(png_structp png_ptr, png_infop info_ptr)
 png_voidp
 png_get_io_ptr(png_structp png_ptr)
 {
-   return png_ptr->io_ptr;
+   return (png_ptr->io_ptr);
 }
 
 #if !defined(PNG_NO_STDIO)

png.h

@@ -1,32 +1,55 @@
 
 /* png.h - header file for PNG reference library
  *
- * libpng 0.97 beta
- * For conditions of distribution and use, see copyright notice in png.h
+ * libpng 1.0.1c
+ * For conditions of distribution and use, see the COPYRIGHT NOTICE below.
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998 Glenn Randers-Pehrson
- * January 7, 1998
+ * May 9, 1998
  *
- * BETA NOTICE:
- *    This is a beta version.  It reads and writes valid files on the
- *    platforms I have, and has had a wide testing program.  You may
- *    have to modify the includes below to get it to work on your
- *    system, and you may have to supply the correct compiler flags in
- *    the makefile if you can't find a makefile suitable for your
- *    operating system/compiler combination.  Read libpng.txt for more
- *    information, including how to contact the authors if you have any
- *    problems, or if you want your compiler/platform to be supported in
- *    the next official libpng release.
+ * Note about libpng version numbers:
  *
- * See libpng.txt for more information.  The PNG specification is available
- * as RFC 2083 <ftp://ftp.uu.net/graphics/png/documents/>
- * and as a W3C Recommendation <http://www.w3.org/pub/WWW/TR/REC.png.html>
+ *    Due to various miscommunications, unforeseen code incompatibilities
+ *    and occasional factors outside the authors' control, version numbering
+ *    on the library has not always been consistent and straightforward.
+ *    The following table summarizes matters since version 0.89c, which was
+ *    the first widely used release:
+ *
+ *      source                    png.h   png.h   shared-lib
+ *      version                   string    int   version
+ *      -------                   ------  -----  ----------
+ *      0.89c ("1.0 beta 3")      0.89       89  1.0.89
+ *      0.90  ("1.0 beta 4")      0.90       90  0.90  [should have been 2.0.90]
+ *      0.95  ("1.0 beta 5")      0.95       95  0.95  [should have been 2.0.95]
+ *      0.96  ("1.0 beta 6")      0.96       96  0.96  [should have been 2.0.96]
+ *      0.97b ("1.00.97 beta 7")  1.00.97    97  1.0.1 [should have been 2.0.97]
+ *      0.97c                     0.97       97  2.0.97
+ *      0.98                      0.98       98  2.0.98
+ *      0.99                      0.99       98  2.0.99
+ *      0.99a-m                   0.99       99  2.0.99
+ *      1.00                      1.00      100  2.1.0 [int should be 10000]
+ *      1.0.0                     1.0.0     100  2.1.0 [int should be 10000]
+ *      1.0.1                     1.0.1   10001  2.1.0
+ *      1.0.1a                    1.0.1a  10002  2.1.0.1a
+ *      1.0.1b                    1.0.1b  10002  2.1.0.1b
+ *      1.0.1c                    1.0.1c  10002  2.1.0.1c
+ *
+ *    Henceforth the source version will match the shared-library minor
+ *    and patch numbers; the shared-library major version number will be
+ *    used for changes in backward compatibility, as it is intended.  The
+ *    PNG_PNGLIB_VER macro, which is not used within libpng but is available
+ *    for applications, is an unsigned integer of the form xyyzz corresponding
+ *    to the source version x.y.z (leading zeros in y and z).
+ *
+ * See libpng.txt or libpng.3 for more information.  The PNG specification
+ * is available as RFC 2083 <ftp://ftp.uu.net/graphics/png/documents/>
+ * and as a W3C Recommendation <http://www.w3.org/TR/REC.png.html>
  *
  * Contributing Authors:
  *    John Bowler
- *    Sam Bushell
  *    Kevin Bracey
+ *    Sam Bushell
  *    Andreas Dilger
  *    Magnus Holmgren
  *    Tom Lane
@@ -36,6 +59,7 @@
  *    Guy Eric Schalnat
  *    Paul Schmidt
  *    Tom Tanner
+ *    Willem van Schaik
  *    Tim Wegner
  *
  * The contributing authors would like to thank all those who helped
@@ -44,6 +68,8 @@
  *
  * Thanks to Frank J. T. Wojcik for helping with the documentation.
  *
+ * COPYRIGHT NOTICE:
+ *
  * The PNG Reference Library is supplied "AS IS".  The Contributing Authors
  * and Group 42, Inc. disclaim all warranties, expressed or implied,
  * including, without limitation, the warranties of merchantability and of
@@ -94,57 +120,32 @@ extern "C" {
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "0.97"
+#define PNG_LIBPNG_VER_STRING "1.0.1c"
 
-/* careful here.  At one time, I wanted to use 082, but that would be octal.
- * Version 1.0 will be 100 here, etc.
- */
-#define PNG_LIBPNG_VER  97
+/* Careful here.  At one time, Guy wanted to use 082, but that would be octal.
+ * We must not include leading zeros.
+ * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
+ * version 1.0.0 was mis-numbered 100 instead of 10000).  From
+ * version 1.0.1 it's    xxyyzz, where x=major, y=minor, z=bugfix */
+#define PNG_LIBPNG_VER    10002  /* 1.0.2 */
 
 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
-#ifndef PNG_NO_EXTERN
+#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
 /* Version information for C files, stored in png.c.  This had better match
  * the version above.
  */
-extern char png_libpng_ver[];
+extern char png_libpng_ver[12];   /* need room for 99.99.99aa */
 
-/*
- * Note about libpng version numbers:
- *
- *    Due to various miscommunications, unforeseen code incompatibilities
- *    and occasional factors outside the authors' control, version numbering
- *    on the library has not always been consistent and straightforward.
- *    The following table summarizes matters since version 0.89c, which was
- *    the first widely used release:
- *
- *      source                    png.h     shared-lib
- *      version                   string    version
- *      -------                   ------    ----------
- *      0.89c ("1.0 beta 3")      0.89      1.0.89
- *      0.90  ("1.0 beta 4")      0.90      0.90  [should have been 2.0.90]
- *      0.95  ("1.0 beta 5")      0.95      0.95  [should have been 2.0.95]
- *      0.96  ("1.0 beta 6")      0.96      0.96  [should have been 2.0.96]
- *      0.97b ("1.00.97 beta 7")  1.00.97   1.0.0 [should have been 2.0.97]
- *      0.97c                     0.97      2.0.97
- *      0.98                      0.98      2.0.98
- *      0.99                      0.99      2.0.99
- *      1.0                       1.00      2.1.0
- *
- *    Henceforth the source version will match the shared-library minor
- *    and patch numbers; the shared-library major version number will be
- *    used for changes in backward compatibility, as it is intended.
- */
- 
 /* Structures to facilitate easy interlacing.  See png.c for more details */
-extern int FARDATA png_pass_start[];
-extern int FARDATA png_pass_inc[];
-extern int FARDATA png_pass_ystart[];
-extern int FARDATA png_pass_yinc[];
-extern int FARDATA png_pass_mask[];
-extern int FARDATA png_pass_dsp_mask[];
+extern int FARDATA png_pass_start[7];
+extern int FARDATA png_pass_inc[7];
+extern int FARDATA png_pass_ystart[7];
+extern int FARDATA png_pass_yinc[7];
+extern int FARDATA png_pass_mask[7];
+extern int FARDATA png_pass_dsp_mask[7];
 /* These aren't currently used.  If you need them, see png.c for more details
-extern int FARDATA png_pass_width[];
-extern int FARDATA png_pass_height[];
+extern int FARDATA png_pass_width[7];
+extern int FARDATA png_pass_height[7];
 */
 #endif /* PNG_NO_EXTERN */
 
@@ -248,7 +249,7 @@ typedef struct png_info_struct
    png_uint_32 width;       /* width of image in pixels (from IHDR) */
    png_uint_32 height;      /* height of image in pixels (from IHDR) */
    png_uint_32 valid;       /* valid chunk data (see PNG_INFO_ below) */
-   png_size_t rowbytes;     /* bytes needed to hold an untransformed row */
+   png_uint_32 rowbytes;    /* bytes needed to hold an untransformed row */
    png_colorp palette;      /* array of color values (valid & PNG_INFO_PLTE) */
    png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */
    png_uint_16 num_trans;   /* number of transparent palette color (tRNS) */
@@ -270,7 +271,8 @@ typedef struct png_info_struct
     * and initialize the appropriate fields below.
     */
 
-#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED)
+#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED) || \
+    defined(PNG_READ_GAMMA_SUPPORTED)
    /* The gAMA chunk describes the gamma characteristics of the system
     * on which the image was created, normally in the range [1.0, 2.5].
     * Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
@@ -325,7 +327,8 @@ typedef struct png_info_struct
    png_bytep trans; /* transparent values for paletted image */
    png_color_16 trans_values; /* transparent color for non-palette image */
 #endif /* PNG_READ_tRNS_SUPPORTED || PNG_WRITE_tRNS_SUPPORTED */
-#if defined(PNG_READ_bKGD_SUPPORTED) || defined(PNG_WRITE_bKGD_SUPPORTED)
+#if defined(PNG_READ_bKGD_SUPPORTED) || defined(PNG_WRITE_bKGD_SUPPORTED) || \
+    defined(PNG_READ_BACKGROUND_SUPPORTED)
    /* The bKGD chunk gives the suggested image background color if the
     * display program does not have its own background color and the image
     * is needs to composited onto a background before display.  The colors
@@ -446,6 +449,15 @@ typedef png_info FAR * FAR * png_infopp;
 #define PNG_RESOLUTION_METER      1 /* pixels/meter */
 #define PNG_RESOLUTION_LAST       2 /* Not a valid value */
 
+/* These are for the sRGB chunk.  These values should NOT be changed. */
+#define PNG_sRGB_INTENT_SATURATION 0
+#define PNG_sRGB_INTENT_PERCEPTUAL 1
+#define PNG_sRGB_INTENT_ABSOLUTE   2
+#define PNG_sRGB_INTENT_RELATIVE   3
+#define PNG_sRGB_INTENT_LAST       4 /* Not a valid value */
+                        
+
+
 /* These determine if an ancillary chunk's data has been successfully read
  * from the PNG header, or if the application has filled in the corresponding
  * data in the info_struct to be written into the output file.  The values
@@ -471,7 +483,7 @@ typedef png_info FAR * FAR * png_infopp;
 typedef struct png_row_info_struct
 {
    png_uint_32 width; /* width of row */
-   png_size_t rowbytes; /* number of bytes in row */
+   png_uint_32 rowbytes; /* number of bytes in row */
    png_byte color_type; /* color type of row */
    png_byte bit_depth; /* bit depth of row */
    png_byte channels; /* number of channels (1, 2, 3, or 4) */
@@ -492,6 +504,8 @@ typedef png_struct FAR * png_structp;
 typedef void (*png_error_ptr) PNGARG((png_structp, png_const_charp));
 typedef void (*png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));
 typedef void (*png_flush_ptr) PNGARG((png_structp));
+typedef void (*png_read_status_ptr) PNGARG((png_structp, png_uint_32, int));
+typedef void (*png_write_status_ptr) PNGARG((png_structp, png_uint_32, int));
 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
 typedef void (*png_progressive_info_ptr) PNGARG((png_structp, png_infop));
 typedef void (*png_progressive_end_ptr) PNGARG((png_structp, png_infop));
@@ -499,6 +513,12 @@ typedef void (*png_progressive_row_ptr) PNGARG((png_structp, png_bytep,
    png_uint_32, int));
 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
 
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
+    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+typedef void (*png_user_transform_ptr) PNGARG((png_structp,
+    png_row_infop, png_bytep));
+#endif /* PNG_READ|WRITE_USER_TRANSFORM_SUPPORTED */
+
 /* The structure that holds the information to read and write PNG files.
  * The only people who need to care about what is inside of this are the
  * people who will be modifying the library for their own special needs.
@@ -515,9 +535,14 @@ struct png_struct_def
    png_voidp error_ptr;       /* user supplied struct for error functions */
    png_rw_ptr write_data_fn;  /* function for writing output data */
    png_rw_ptr read_data_fn;   /* function for reading input data */
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
+    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+   png_user_transform_ptr read_user_transform_fn; /* user read transform */
+   png_user_transform_ptr write_user_transform_fn; /* user write transform */
+#endif
    png_voidp io_ptr;          /* ptr to application struct for I/O functions*/
 
-   png_uint_32 mode;          /* tells us whre we are in the PNG file */
+   png_uint_32 mode;          /* tells us where we are in the PNG file */
    png_uint_32 flags;         /* flags indicating various things to libpng */
    png_uint_32 transformations; /* which transformations to perform */
 
@@ -534,8 +559,8 @@ struct png_struct_def
    png_uint_32 height;        /* height of image in pixels */
    png_uint_32 num_rows;      /* number of rows in current pass */
    png_uint_32 usr_width;     /* width of row at start of write */
-   png_size_t rowbytes;       /* size of row in bytes */
-   png_size_t irowbytes;      /* size of current interlaced row in bytes */
+   png_uint_32 rowbytes;      /* size of row in bytes */
+   png_uint_32 irowbytes;     /* size of current interlaced row in bytes */
    png_uint_32 iwidth;        /* width of current interlaced row in pixels */
    png_uint_32 row_number;    /* current row in interlace pass */
    png_bytep prev_row;        /* buffer to save previous (unfiltered) row */
@@ -566,7 +591,7 @@ struct png_struct_def
    png_byte sig_bytes;        /* magic bytes read/written from start of file */
 
 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
-   png_byte filler;           /* filler byte for 24->32-bit pixel expansion */
+   png_uint_16 filler;           /* filler bytes for pixel expansion */
 #endif /* PNG_READ_FILLER_SUPPORTED */
 #if defined(PNG_READ_bKGD_SUPPORTED)
    png_byte background_gamma_type;
@@ -582,9 +607,9 @@ struct png_struct_def
    png_uint_32 flush_rows;    /* number of rows written since last flush */
 #endif /* PNG_WRITE_FLUSH_SUPPORTED */
 #if defined(PNG_READ_GAMMA_SUPPORTED)
-   int gamma_shift;           /* number of "insignificant" bits 16-bit gamma */
-   float gamma;               /* file gamma value */
-   float display_gamma;       /* display gamma value */
+   int gamma_shift;      /* number of "insignificant" bits 16-bit gamma */
+   float gamma;          /* file gamma value */
+   float screen_gamma;   /* screen gamma value (display_gamma/viewing_gamma */
 #endif /* PNG_READ_GAMMA_SUPPORTED */
 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
    png_bytep gamma_table;     /* gamma table for 8 bit depth files */
@@ -604,9 +629,11 @@ struct png_struct_def
    png_bytep trans;           /* transparency values for paletted files */
    png_color_16 trans_values; /* transparency values for non-paletted files */
 #endif /* PNG_READ_tRNS_SUPPORTED || PNG_READ_BACKGROUND_SUPPORTED */
+   png_read_status_ptr read_row_fn;   /* called after each row is decoded */
+   png_write_status_ptr write_row_fn; /* called after each row is encoded */
 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
    png_progressive_info_ptr info_fn; /* called after header data fully read */
-   png_progressive_row_ptr row_fn;   /* called after each row is decoded */
+   png_progressive_row_ptr row_fn;   /* called after each prog. row is decoded */
    png_progressive_end_ptr end_fn;   /* called after image is complete */
    png_bytep save_buffer_ptr;        /* current location in save_buffer */
    png_bytep save_buffer;            /* buffer for previously read data */
@@ -626,6 +653,7 @@ struct png_struct_def
    png_charp current_text;           /* current text chunk buffer */
    png_charp current_text_ptr;       /* current location in current_text */
 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_READ_tEXt/zTXt_SUPPORTED */
+#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
 /* for the Borland special 64K segment handler */
    png_bytepp offset_table_ptr;
@@ -633,13 +661,14 @@ struct png_struct_def
    png_uint_16 offset_table_number;
    png_uint_16 offset_table_count;
    png_uint_16 offset_table_count_free;
-#endif /* PNG_PROGRESSIVE_READ_SUPPORTED&&__TURBOC__&&!_Windows&&!__FLAT__ */
-#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
+#endif /* __TURBOC__&&!_Windows&&!__FLAT__ */
 #if defined(PNG_READ_DITHER_SUPPORTED)
    png_bytep palette_lookup;         /* lookup table for dithering */
    png_bytep dither_index;           /* index translation for palette files */
-   png_uint_16p hist;                /* histogram */
 #endif /* PNG_READ_DITHER_SUPPORTED */
+#if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_READ_hIST_SUPPORTED)
+   png_uint_16p hist;                /* histogram */
+#endif
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
    png_byte heuristic_method;        /* heuristic for row filter selection */
    png_byte num_prev_filters;        /* number of weights for previous rows */
@@ -649,9 +678,9 @@ struct png_struct_def
    png_uint_16p filter_costs;        /* relative filter calculation cost */
    png_uint_16p inv_filter_costs;    /* 1/relative filter calculation cost */
 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
-#if defined(PNG_TIME_RFC1152_SUPPORTED)
-   png_charp time_buffer;            /* String to hold RFC 1152 time text */
-#endif /* PNG_TIME_RFC1152_SUPPORTED */
+#if defined(PNG_TIME_RFC1123_SUPPORTED)
+   png_charp time_buffer;            /* String to hold RFC 1123 time text */
+#endif /* PNG_TIME_RFC1123_SUPPORTED */
 };
 
 typedef png_struct FAR * FAR * png_structpp;
@@ -683,14 +712,29 @@ extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num));
 
 /* Allocate and initialize png_ptr struct for reading, and any other memory. */
 extern PNG_EXPORT(png_structp,png_create_read_struct)
-   PNGARG((png_const_charp user_png_ver, voidp error_ptr,
+   PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
    png_error_ptr error_fn, png_error_ptr warn_fn));
 
 /* Allocate and initialize png_ptr struct for reading, and any other memory */
 extern PNG_EXPORT(png_structp,png_create_write_struct)
-   PNGARG((png_const_charp user_png_ver, voidp error_ptr,
+   PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
    png_error_ptr error_fn, png_error_ptr warn_fn));
 
+/* Write a PNG chunk - size, type, (optional) data, CRC. */
+extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr,
+   png_bytep chunk_name, png_bytep data, png_size_t length));
+
+/* Write the start of a PNG chunk - length and chunk name. */
+extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr,
+   png_bytep chunk_name, png_uint_32 length));
+
+/* Write the data of a PNG chunk started with png_write_chunk_start(). */
+extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr,
+   png_bytep data, png_size_t length));
+
+/* Finish a chunk started with png_write_chunk_start() (includes CRC). */
+extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr));
+
 /* Allocate and initialize the info structure */
 extern PNG_EXPORT(png_infop,png_create_info_struct)
    PNGARG((png_structp png_ptr));
@@ -706,10 +750,10 @@ extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,
 extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,
    png_infop info_ptr));
 
-#if defined(PNG_TIME_RFC1152_SUPPORTED)
-extern PNG_EXPORT(png_charp,png_convert_to_rfc1152)
+#if defined(PNG_TIME_RFC1123_SUPPORTED)
+extern PNG_EXPORT(png_charp,png_convert_to_rfc1123)
    PNGARG((png_structp png_ptr, png_timep ptime));
-#endif /* PNG_TIME_RFC1152_SUPPORTED */
+#endif /* PNG_TIME_RFC1123_SUPPORTED */
 
 #if defined(PNG_WRITE_tIME_SUPPORTED)
 /* convert from a struct tm to png_time */
@@ -753,6 +797,11 @@ extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr));
 extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr));
 #endif /* PNG_READ_SWAP_ALPHA_SUPPORTED || PNG_WRITE_SWAP_ALPHA_SUPPORTED */
 
+#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
+    defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
+extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr));
+#endif /* PNG_READ_INVERT_ALPHA_SUPPORTED || PNG_WRITE_INVERT_ALPHA_SUPPORTED */
+
 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
 /* Add a filler byte to 24-bit RGB images. */
 extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr,
@@ -773,7 +822,7 @@ extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr));
 extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr));
 #endif /* PNG_READ_PACK_SUPPORTED || PNG_WRITE_PACK_SUPPORTED */
 
-#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPOR)
+#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
 /* Swap packing order of pixels in bytes. */
 extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr));
 #endif /* PNG_READ_PACKSWAP_SUPPORTED || PNG_WRITE_PACKSWAP_SUPPOR */
@@ -819,7 +868,7 @@ extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr,
 #endif /* PNG_READ_DITHER_SUPPORTED */
 
 #if defined(PNG_READ_GAMMA_SUPPORTED)
-/* Handle gamma correction. */
+/* Handle gamma correction. Screen_gamma=(display_gamma/viewing_gamma) */
 extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,
    double screen_gamma, double default_file_gamma));
 #endif /* PNG_READ_GAMMA_SUPPORTED */
@@ -1058,6 +1107,22 @@ extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr,
 /* Return the user pointer associated with the I/O functions */
 extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr));
 
+extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr,
+   png_read_status_ptr read_row_fn));
+
+extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr,
+   png_write_status_ptr write_row_fn));
+
+#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
+extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp
+   png_ptr, png_user_transform_ptr read_user_transform_fn));
+#endif
+
+#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
+extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp
+   png_ptr, png_user_transform_ptr write_user_transform_fn));
+#endif
+
 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
 /* Sets the function callbacks for the push reader, and a pointer to a
  * user-defined structure available to the callback functions.
@@ -1088,8 +1153,22 @@ extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
 /* frees a pointer allocated by png_malloc() */
 extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
 
+extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr,
+   png_voidp s1, png_voidp s2, png_uint_32 size));
+
+extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr,
+   png_voidp s1, int value, png_uint_32 size));
+
+#ifdef PNGTEST_MEMORY_DEBUG
+/* debugging versions of png_malloc() and png_free() */
+extern PNG_EXPORT(png_voidp,png_debug_malloc) PNGARG((png_structp png_ptr,
+   png_uint_32 size));
+extern PNG_EXPORT(void,png_debug_free) PNGARG((png_structp png_ptr,
+   png_voidp ptr));
+#endif
 #if defined(USE_FAR_KEYWORD)  /* memory model conversion function */
-extern void *far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,int check));
+extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
+   int check));
 #endif /* USE_FAR_KEYWORD */
 
 /* Fatal error in PNG image of libpng - can't continue */
@@ -1120,18 +1199,71 @@ extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
  * to avoid problems with future changes in the size and internal layout of
  * png_info_struct.
  */
-/* Returns "flag" if chunk data is valid in info_ptr */
+/* Returns "flag" if chunk data is valid in info_ptr. */
 extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr,
 png_infop info_ptr, png_uint_32 flag));
 
-/* Returns number of bytes needed to hold a transformed row */
+/* Returns number of bytes needed to hold a transformed row. */
 extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr,
 png_infop info_ptr));
 
-/* Returns number of color channels in image */
+/* Returns number of color channels in image. */
 extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,
 png_infop info_ptr));
 
+#ifdef PNG_EASY_ACCESS_SUPPORTED
+/* Returns image width in pixels. */
+extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+
+/* Returns image height in pixels. */
+extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+
+/* Returns image bit_depth. */
+extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+
+/* Returns image color_type. */
+extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+
+/* Returns image filter_type. */
+extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+
+/* Returns image interlace_type. */
+extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+
+/* Returns image compression_type. */
+extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+
+/* Returns image resolution in pixels per meter, from pHYs chunk data. */
+extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+
+/* Returns pixel aspect ratio, computed from pHYs chunk data.  */
+extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+
+/* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
+extern PNG_EXPORT(png_uint_32, png_get_x_offset_pixels) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+extern PNG_EXPORT(png_uint_32, png_get_y_offset_pixels) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+extern PNG_EXPORT(png_uint_32, png_get_x_offset_microns) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+extern PNG_EXPORT(png_uint_32, png_get_y_offset_microns) PNGARG((png_structp
+png_ptr, png_infop info_ptr));
+
+#endif /* PNG_EASY_ACCESS_SUPPORTED */
+
 /* Returns pointer to signature string read from PNG header */
 extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr,
 png_infop info_ptr));
@@ -1240,14 +1372,14 @@ extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,
 
 #if defined(PNG_READ_sRGB_SUPPORTED)
 extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_bytep srgb_intent));
+   png_infop info_ptr, int *intent));
 #endif /* PNG_READ_sRGB_SUPPORTED */
 
 #if defined(PNG_READ_sRGB_SUPPORTED) || defined(PNG_WRITE_sRGB_SUPPORTED)
 extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_byte srgb_intent));
+   png_infop info_ptr, int intent));
 extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_byte srgb_intent));
+   png_infop info_ptr, int intent));
 #endif /* PNG_READ_sRGB_SUPPORTED || PNG_WRITE_sRGB_SUPPORTED */
 
 #if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
@@ -1291,6 +1423,9 @@ extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
  * libpng yet, but more support will be added as needed.
  */
 #if (PNG_DEBUG > 0)
+#ifdef PNG_NO_STDIO
+#include <stdio.h>
+#endif
 #ifndef PNG_DEBUG_FILE
 #define PNG_DEBUG_FILE stderr
 #endif /* PNG_DEBUG_FILE */
@@ -1310,6 +1445,45 @@ extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
 #define png_debug2(l, m, p1, p2)
 #endif /* (PNG_DEBUG > 0) */
 
+#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
+/* With these routines, we avoid an integer divide, which will be slower on
+ * many machines.  However, it does take more operations than the corresponding
+ * divide method, so it may be slower on some RISC systems.  There are two
+ * shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
+ *
+ * Note that the rounding factors are NOT supposed to be the same!  128 and
+ * 32768 are correct for the NODIV code; 127 and 32767 are correct for the
+ * standard method.
+ *
+ * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
+ */
+
+   /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
+#  define png_composite(composite, fg, alpha, bg) \
+     { png_uint_16 temp = ((png_uint_16)(fg) * (png_uint_16)(alpha) + \
+                        (png_uint_16)(bg)*(png_uint_16)(255 - \
+                        (png_uint_16)(alpha)) + (png_uint_16)128); \
+       (composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
+#  define png_composite_16(composite, fg, alpha, bg) \
+     { png_uint_32 temp = ((png_uint_32)(fg) * (png_uint_32)(alpha) + \
+                        (png_uint_32)(bg)*(png_uint_32)(65535L - \
+                        (png_uint_32)(alpha)) + (png_uint_32)32768L); \
+       (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
+
+#else  /* standard method using integer division */
+
+   /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
+#  define png_composite(composite, fg, alpha, bg) \
+     (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \
+       (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \
+       (png_uint_16)127) / 255)
+#  define png_composite_16(composite, fg, alpha, bg) \
+     (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
+       (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \
+       (png_uint_32)32767) / (png_uint_32)65535L)
+
+#endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
+
 /* These next functions are used internally in the code.  They generally
  * shouldn't be used unless you are writing code to add or replace some
  * functionality in libpng.  More information about most functions can
@@ -1358,9 +1532,11 @@ extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
 #define PNG_GAMMA              0x2000
 #define PNG_GRAY_TO_RGB        0x4000
 #define PNG_FILLER             0x8000
-#define PNG_PACKSWAP          0x10000
-#define PNG_SWAP_ALPHA        0x20000
-#define PNG_STRIP_ALPHA       0x40000
+#define PNG_PACKSWAP          0x10000L
+#define PNG_SWAP_ALPHA        0x20000L
+#define PNG_STRIP_ALPHA       0x40000L
+#define PNG_INVERT_ALPHA      0x80000L
+#define PNG_USER_TRANSFORM   0x100000L
 
 /* flags for png_create_struct */
 #define PNG_STRUCT_PNG   0x0001
@@ -1388,8 +1564,9 @@ extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
 #define PNG_FLAG_FREE_PALETTE             0x1000
 #define PNG_FLAG_FREE_TRANS               0x2000
 #define PNG_FLAG_FREE_HIST                0x4000
-#define PNG_FLAG_HAVE_CHUNK_HEADER        0x8000
-#define PNG_FLAG_WROTE_tIME              0x10000
+#define PNG_FLAG_HAVE_CHUNK_HEADER        0x8000L
+#define PNG_FLAG_WROTE_tIME              0x10000L
+#define PNG_FLAG_BACKGROUND_IS_GRAY      0x20000L
 
 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
                                      PNG_FLAG_CRC_ANCILLARY_NOWARN)
@@ -1406,32 +1583,32 @@ extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
    abs((int)((c1).blue) - (int)((c2).blue)))
 
 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
-#ifndef PNG_NO_EXTERN
-/* place to hold the signiture string for a PNG file. */
-extern png_byte FARDATA png_sig[];
+#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
+/* place to hold the signature string for a PNG file. */
+extern png_byte FARDATA png_sig[8];
 
 /* Constant strings for known chunk types.  If you need to add a chunk,
  * add a string holding the name here.  See png.c for more details.  We
  * can't selectively include these, since we still check for chunk in the
  * wrong locations with these labels.
  */
-extern png_byte FARDATA png_IHDR[];
-extern png_byte FARDATA png_IDAT[];
-extern png_byte FARDATA png_IEND[];
-extern png_byte FARDATA png_PLTE[];
-extern png_byte FARDATA png_bKGD[];
-extern png_byte FARDATA png_cHRM[];
-extern png_byte FARDATA png_gAMA[];
-extern png_byte FARDATA png_hIST[];
-extern png_byte FARDATA png_oFFs[];
-extern png_byte FARDATA png_pCAL[];
-extern png_byte FARDATA png_pHYs[];
-extern png_byte FARDATA png_sBIT[];
-extern png_byte FARDATA png_sRGB[];
-extern png_byte FARDATA png_tEXt[];
-extern png_byte FARDATA png_tIME[];
-extern png_byte FARDATA png_tRNS[];
-extern png_byte FARDATA png_zTXt[];
+extern png_byte FARDATA png_IHDR[5];
+extern png_byte FARDATA png_IDAT[5];
+extern png_byte FARDATA png_IEND[5];
+extern png_byte FARDATA png_PLTE[5];
+extern png_byte FARDATA png_bKGD[5];
+extern png_byte FARDATA png_cHRM[5];
+extern png_byte FARDATA png_gAMA[5];
+extern png_byte FARDATA png_hIST[5];
+extern png_byte FARDATA png_oFFs[5];
+extern png_byte FARDATA png_pCAL[5];
+extern png_byte FARDATA png_pHYs[5];
+extern png_byte FARDATA png_sBIT[5];
+extern png_byte FARDATA png_sRGB[5];
+extern png_byte FARDATA png_tEXt[5];
+extern png_byte FARDATA png_tIME[5];
+extern png_byte FARDATA png_tRNS[5];
+extern png_byte FARDATA png_zTXt[5];
 
 #endif /* PNG_NO_EXTERN */
 
@@ -1455,7 +1632,7 @@ PNG_EXTERN png_int_32 png_get_int_32 PNGARG((png_bytep buf));
 #endif /* PNG_READ_pCAL_SUPPORTED */
 PNG_EXTERN png_uint_32 png_get_uint_32 PNGARG((png_bytep buf));
 PNG_EXTERN png_uint_16 png_get_uint_16 PNGARG((png_bytep buf));
-#endif /* PNG_BIG_ENDIAN_GET_SUPPORTED */
+#endif /* PNG_READ_BIG_ENDIAN_SUPPORTED */
 
 /* Initialize png_ptr struct for reading, and allocate any other memory.
  * (old interface - NOT DLL EXPORTED).
@@ -1531,22 +1708,7 @@ PNG_EXTERN void png_save_int_32 PNGARG((png_bytep buf, png_int_32 i));
  */
 PNG_EXTERN void png_save_uint_16 PNGARG((png_bytep buf, unsigned int i));
 
-/* Write a PNG chunk - size, type, (optional) data, CRC. */
-PNG_EXTERN void png_write_chunk PNGARG((png_structp png_ptr,
-   png_bytep chunk_name, png_bytep data, png_size_t length));
-
-/* Write the start of a PNG chunk - length and chunk name. */
-PNG_EXTERN void png_write_chunk_start PNGARG((png_structp png_ptr,
-   png_bytep chunk_name, png_uint_32 length));
-
-/* Write the data of a PNG chunk started with png_write_chunk_start(). */
-PNG_EXTERN void png_write_chunk_data PNGARG((png_structp png_ptr,
-   png_bytep data, png_size_t length));
-
-/* Finish a chunk started with png_write_chunk_start() (includes CRC). */
-PNG_EXTERN void png_write_chunk_end PNGARG((png_structp png_ptr));
-
-/* simple function to write the signiture */
+/* simple function to write the signature */
 PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr));
 
 /* write various chunks */
@@ -1585,7 +1747,7 @@ PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
 
 #if defined(PNG_WRITE_sRGB_SUPPORTED)
 PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
-   png_byte srgb_intent));
+   int intent));
 #endif
 
 #if defined(PNG_WRITE_tRNS_SUPPORTED)
@@ -1600,7 +1762,7 @@ PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
 
 #if defined(PNG_WRITE_hIST_SUPPORTED)
 PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
-   png_uint_32 num_hist));
+   int num_hist));
 #endif
 
 #if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
@@ -1702,6 +1864,16 @@ PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
    png_bytep row));
 #endif
 
+#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
+PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
+   png_bytep row));
+#endif
+
+#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
+PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
+   png_bytep row));
+#endif
+
 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
     defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
 PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
@@ -1712,7 +1884,7 @@ PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
 PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row));
 #endif
 
-#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPOR)
+#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
 PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
 #endif
 

pngconf.h

@@ -1,12 +1,12 @@
 
-/* pngconf.c - machine configurable file for libpng
+/* pngconf.h - machine configurable file for libpng
  *
- * libpng 0.97
+ * libpng 1.0.1c
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * January 7, 1998
+ * May 9, 1998
  */
 
 /* Any machine specific code is near the front of this file, so if you
@@ -27,7 +27,7 @@
  * where it becomes significant, if you are concerned with memory
  * usage.  Note that zlib allocates at least 32Kb also.  For readers,
  * this describes the size of the buffer available to read the data in.
- * Unless this gets smaller then the size of a row (compressed),
+ * Unless this gets smaller than the size of a row (compressed),
  * it should not make much difference how big this is.
  */
 
@@ -55,8 +55,6 @@
  * #define PNG_NO_STDIO
  */
 
-/* We still need stdio.h for FILE even when PNG_NO_STDIO is defined.
- */
 #ifndef PNG_NO_STDIO 
 #include <stdio.h>
 #endif
@@ -88,10 +86,12 @@
  * just __MWERKS__ is not good enough, because the Codewarrior is now used
  * on non-Mac platforms.
  */
+#ifndef MACOS
 #if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
-    defined(THINK_C) || defined(__SC__)
+    defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
 #define MACOS
 #endif
+#endif
 
 /* enough people need this for various reasons to include it here */
 #if !defined(MACOS) && !defined(RISCOS)
@@ -157,6 +157,11 @@ __dont__ include it again
 #include <math.h>
 #endif
 
+/* Codewarrior on NT has linking problems without this. */
+#if defined(__MWERKS__) && defined(WIN32)
+#define PNG_ALWAYS_EXTERN
+#endif
+
 /* For some reason, Borland C++ defines memcmp, etc. in mem.h, not
  * stdlib.h like it should (I think).  Or perhaps this is a C++
  * "feature"?
@@ -191,24 +196,25 @@ __dont__ include it again
  * less then 8, and even that may not work (I haven't tested it).
  */
 
+#ifndef PNG_MAX_GAMMA_8
 #define PNG_MAX_GAMMA_8 11
+#endif
 
 /* This controls how much a difference in gamma we can tolerate before
  * we actually start doing gamma conversion.
  */
+#ifndef PNG_GAMMA_THRESHOLD
 #define PNG_GAMMA_THRESHOLD 0.05
+#endif
 
 #endif /* PNG_INTERNAL */
 
 /* The following uses const char * instead of char * for error
  * and warning message functions, so some compilers won't complain.
- * If you want to use const, define PNG_USE_CONST here.  It is not
- * normally defined to make configuration easier, as it is not a
- * critical part of the code.
+ * If you do not want to use const, define PNG_NO_CONST here.
  */
-#define PNG_USE_CONST
 
-#ifdef PNG_USE_CONST
+#ifndef PNG_NO_CONST
 #  define PNG_CONST const
 #else
 #  define PNG_CONST
@@ -230,106 +236,283 @@ __dont__ include it again
 
 /* Any transformations you will not be using can be undef'ed here */
 
-/* GR-P, 0.96a: Set "*FULLY_SUPPORTED as default but allow user
-   to turn it off with "*NOT_FULLY_SUPPORTED" on the compile line,
-   then pick and choose which ones to define without having to edit
-   this file */
+/* GR-P, 0.96a: Set "*TRANSFORMS_SUPPORTED as default but allow user
+   to turn it off with "*TRANSFORMS_NOT_SUPPORTED" or *PNG_NO_*_TRANSFORMS
+   on the compile line, then pick and choose which ones to define without
+   having to edit this file. It is safe to use the *TRANSFORMS_NOT_SUPPORTED
+   if you only want to have a png-compliant reader/writer but don't need
+   any of the extra transformations.  This saves about 80 kbytes in a
+   typical installation of the library. (PNG_NO_* form added in version
+   1.0.1c, for consistency)
+ */
 
-#ifndef PNG_READ_NOT_FULLY_SUPPORTED
-#define PNG_READ_FULLY_SUPPORTED
+
+#if !defined(PNG_READ_TRANSFORMS_NOT_SUPPORTED) && \
+    !defined(PNG_NO_READ_TRANSFORMS)
+#define PNG_READ_TRANSFORMS_SUPPORTED
 #endif
-#ifndef PNG_WRITE_NOT_FULLY_SUPPORTED
-#define PNG_WRITE_FULLY_SUPPORTED
+#if !defined(PNG_WRITE_TRANSFORMS_NOT_SUPPORTED) && \
+    !defined(PNG_NO_WRITE_TRANSFORMS)
+#define PNG_WRITE_TRANSFORMS_SUPPORTED
 #endif
 
-#ifdef PNG_READ_FULLY_SUPPORTED
-#define PNG_PROGRESSIVE_READ_SUPPORTED
-#define PNG_READ_OPT_PLTE_SUPPORTED
+#ifdef PNG_READ_TRANSFORMS_SUPPORTED
+#ifndef PNG_NO_READ_EXPAND
 #define PNG_READ_EXPAND_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_SHIFT
 #define PNG_READ_SHIFT_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_PACK
 #define PNG_READ_PACK_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_BGR
 #define PNG_READ_BGR_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_SWAP
 #define PNG_READ_SWAP_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_PACKSWAP
 #define PNG_READ_PACKSWAP_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_INVERT
 #define PNG_READ_INVERT_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_DITHER
 #define PNG_READ_DITHER_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_BACKGROUND
 #define PNG_READ_BACKGROUND_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_16_TO_8
 #define PNG_READ_16_TO_8_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_FILLER
 #define PNG_READ_FILLER_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_GAMMA
 #define PNG_READ_GAMMA_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_GRAY_TO_RGB
 #define PNG_READ_GRAY_TO_RGB_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_SWAP_ALPHA
 #define PNG_READ_SWAP_ALPHA_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_INVERT_ALPHA
+#define PNG_READ_INVERT_ALPHA_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_STRIP_ALPHA
 #define PNG_READ_STRIP_ALPHA_SUPPORTED
-#define PNG_READ_COMPOSITE_NODIV_SUPPORTED        /* well tested on Intel */
-#endif /* PNG_READ_FULLY_SUPPORTED */
-#define PNG_READ_INTERLACING_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_USER_TRANSFORM
+#define PNG_READ_USER_TRANSFORM_SUPPORTED
+#endif
+/* the following aren't implemented yet
+#define PNG_READ_RGB_TO_GRAY_SUPPORTED
+ */
+#endif /* PNG_READ_TRANSFORMS_SUPPORTED */
 
-#ifdef PNG_WRITE_FULLY_SUPPORTED
-#define PNG_WRITE_INTERLACING_SUPPORTED
-#define PNG_WRITE_SHIFT_SUPPORTED
-#define PNG_WRITE_PACK_SUPPORTED
-#define PNG_WRITE_BGR_SUPPORTED
-#define PNG_WRITE_SWAP_SUPPORTED
-#define PNG_WRITE_PACKSWAP_SUPPORTED
-#define PNG_WRITE_INVERT_SUPPORTED
-#define PNG_WRITE_FILLER_SUPPORTED  /* This is the same as WRITE_STRIP_ALPHA */
-#define PNG_WRITE_FLUSH_SUPPORTED
-#define PNG_WRITE_SWAP_ALPHA_SUPPORTED
-#define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
-#endif /* PNG_WRITE_FULLY_SUPPORTED */
+#if !defined(PNG_NO_PROGRESSIVE_READ) && \
+ !defined(PNG_PROGRESSIVE_READ_NOT_SUPPORTED) /* if you don't do progressive   */
+#define PNG_PROGRESSIVE_READ_SUPPORTED       /* reading.  This is not talking */
+#endif                               /* about interlacing capability!  You'll */
+              /* still have interlacing unless you change the following line: */
+#define PNG_READ_INTERLACING_SUPPORTED /* required for PNG-compliant decoders */
 
-#if !defined(PNG_NO_STDIO)
-#define PNG_TIME_RFC1152_SUPPORTED
+#ifndef PNG_NO_READ_COMPOSITED_NODIV
+#define PNG_READ_COMPOSITE_NODIV_SUPPORTED    /* well tested on Intel and SGI */
 #endif
 
-/* These are currently experimental features */
-#undef PNG_READ_16_TO_8_ACCURATE_SHIFT_SUPPORTED /* very little testing */
+#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
+#ifndef PNG_NO_WRITE_SHIFT
+#define PNG_WRITE_SHIFT_SUPPORTED
+#endif
+#ifndef PNG_NO_WRITE_PACK
+#define PNG_WRITE_PACK_SUPPORTED
+#endif
+#ifndef PNG_NO_WRITE_BGR
+#define PNG_WRITE_BGR_SUPPORTED
+#endif
+#ifndef PNG_NO_WRITE_SWAP
+#define PNG_WRITE_SWAP_SUPPORTED
+#endif
+#ifndef PNG_NO_WRITE_PACKSWAP
+#define PNG_WRITE_PACKSWAP_SUPPORTED
+#endif
+#ifndef PNG_NO_WRITE_INVERT
+#define PNG_WRITE_INVERT_SUPPORTED
+#endif
+#ifndef PNG_NO_WRITE_FILLER
+#define PNG_WRITE_FILLER_SUPPORTED  /* This is the same as WRITE_STRIP_ALPHA */
+#endif
+#ifndef PNG_NO_WRITE_SWAP_ALPHA
+#define PNG_WRITE_SWAP_ALPHA_SUPPORTED
+#endif
+#ifndef PNG_NO_WRITE_INVERT_ALPHA
+#define PNG_WRITE_INVERT_ALPHA_SUPPORTED
+#endif
+#ifndef PNG_NO_WRITE_USER_TRANSFORM
+#define PNG_WRITE_USER_TRANSFORM_SUPPORTED
+#endif
+#endif /* PNG_WRITE_TRANSFORMS_SUPPORTED */
+
+#define PNG_WRITE_INTERLACING_SUPPORTED  /* not required for PNG-compliant
+                                            encoders, but can cause trouble
+                                            if left undefined */
+
+#ifndef PNG_NO_WRITE_WEIGHTED_FILTER
+#define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
+#endif
+
+#ifndef PNG_NO_WRITE_FLUSH
+#define PNG_WRITE_FLUSH_SUPPORTED
+#endif
+
+#ifndef PNG_NO_STDIO
+#define PNG_TIME_RFC1123_SUPPORTED
+#endif
+
+/* This adds extra functions in pngget.c for accessing data from the
+ * info pointer (added in version 0.99)
+ * png_get_image_width()
+ * png_get_image_height()
+ * png_get_bit_depth()
+ * png_get_color_type()
+ * png_get_compression_type()
+ * png_get_filter_type()
+ * png_get_interlace_type()
+ * png_get_pixel_aspect_ratio()
+ * png_get_pixels_per_meter()
+ * png_get_x_offset_pixels()
+ * png_get_y_offset_pixels()
+ * png_get_x_offset_microns()
+ * png_get_y_offset_microns()
+ */
+#ifndef PNG_NO_EASY_ACCESS
+#define PNG_EASY_ACCESS_SUPPORTED
+#endif
+
+/* These are currently experimental features, define them if you want */
+
+/* very little testing */
+/*
+#define PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
+*/
 
 /* This is only for PowerPC big-endian and 680x0 systems */
-#undef PNG_READ_BIG_ENDIAN_SUPPORTED             /* some testing */
+/* some testing */
+/*
+#define PNG_READ_BIG_ENDIAN_SUPPORTED
+*/
 
 /* These functions are turned off by default, as they will be phased out. */
-#undef  PNG_USELESS_TESTS_SUPPORTED
-#undef  PNG_CORRECT_PALETTE_SUPPORTED
+/*
+#define  PNG_USELESS_TESTS_SUPPORTED
+#define  PNG_CORRECT_PALETTE_SUPPORTED
+*/
 
 /* Any chunks you are not interested in, you can undef here.  The
  * ones that allocate memory may be expecially important (hIST,
  * tEXt, zTXt, tRNS, pCAL).  Others will just save time and make png_info
- * a bit smaller.  OPT_PLTE only disables the optional palette in RGB
- * and RGBA images.
+ * a bit smaller.
  */
 
-#ifdef PNG_READ_FULLY_SUPPORTED
-#define PNG_READ_bKGD_SUPPORTED
-#define PNG_READ_cHRM_SUPPORTED
-#define PNG_READ_gAMA_SUPPORTED
-#define PNG_READ_hIST_SUPPORTED
-#define PNG_READ_oFFs_SUPPORTED
-#define PNG_READ_pCAL_SUPPORTED
-#define PNG_READ_pHYs_SUPPORTED
-#define PNG_READ_sBIT_SUPPORTED
-#define PNG_READ_sRGB_SUPPORTED
-#define PNG_READ_tEXt_SUPPORTED
-#define PNG_READ_tIME_SUPPORTED
-#define PNG_READ_tRNS_SUPPORTED
-#define PNG_READ_zTXt_SUPPORTED
-#endif /* PNG_READ_FULLY_SUPPORTED */
+#if !defined(PNG_READ_ANCILLARY_CHUNKS_NOT_SUPPORTED) && \
+    !defined(PNG_NO_READ_ANCILLARY_CHUNKS)
+#define PNG_READ_ANCILLARY_CHUNKS_SUPPORTED
+#endif
+#if !defined(PNG_WRITE_ANCILLARY_CHUNKS_NOT_SUPPORTED) && \
+    !defined(PNG_NO_WRITE_ANCILLARY_CHUNKS)
+#define PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
+#endif
 
-#ifdef PNG_WRITE_FULLY_SUPPORTED
+#ifdef PNG_READ_ANCILLARY_CHUNKS_SUPPORTED
+#ifndef PNG_NO_PNG_READ_bKGD
+#define PNG_READ_bKGD_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_READ_cHRM
+#define PNG_READ_cHRM_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_READ_gAMA
+#define PNG_READ_gAMA_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_READ_hIST
+#define PNG_READ_hIST_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_READ_oFFs
+#define PNG_READ_oFFs_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_READ_pCAL
+#define PNG_READ_pCAL_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_READ_pHYs
+#define PNG_READ_pHYs_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_sBIT
+#define PNG_READ_sBIT_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_READ_sRGB
+#define PNG_READ_sRGB_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_READ_tEXt
+#define PNG_READ_tEXt_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_READ_tIME
+#define PNG_READ_tIME_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_READ_tRNS
+#define PNG_READ_tRNS_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_READ_zTXt
+#define PNG_READ_zTXt_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_READ_OPT_PLTE
+#define PNG_READ_OPT_PLTE_SUPPORTED /* only affects support of the optional */
+#endif                              /* PLTE chunk in RGB and RGBA images */
+#endif /* PNG_READ_ANCILLARY_CHUNKS_SUPPORTED */
+
+#ifdef PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
+#ifndef PNG_NO_PNG_WRITE_bKGD
 #define PNG_WRITE_bKGD_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_WRITE_cHRM
 #define PNG_WRITE_cHRM_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_WRITE_gAMA
 #define PNG_WRITE_gAMA_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_WRITE_hIST
 #define PNG_WRITE_hIST_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_WRITE_oFFs
 #define PNG_WRITE_oFFs_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_WRITE_pCAL
 #define PNG_WRITE_pCAL_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_WRITE_pHYs
 #define PNG_WRITE_pHYs_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_WRITE_sBIT
 #define PNG_WRITE_sBIT_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_WRITE_sRGB
 #define PNG_WRITE_sRGB_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_WRITE_tEXt
 #define PNG_WRITE_tEXt_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_WRITE_tIME
 #define PNG_WRITE_tIME_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_WRITE_tRNS
 #define PNG_WRITE_tRNS_SUPPORTED
+#endif
+#ifndef PNG_NO_PNG_WRITE_zTXt
 #define PNG_WRITE_zTXt_SUPPORTED
-#endif /* PNG_WRITE_FULLY_SUPPORTED */
+#endif
+#endif /* PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED */
 
 /* need the time information for reading tIME chunks */
 #if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_tIME_SUPPORTED)
@@ -455,7 +638,7 @@ typedef z_stream FAR *  png_zstreamp;
 
 /* allow for compilation as dll with BORLAND C++ 5.0 */
 #if defined(__BORLANDC__) && defined(_Windows) && defined(__DLL__)
-#   define PNG_EXPORT(t,s) t _export s
+#   define PNG_EXPORT(type,symbol) type _export symbol
 #endif
 
 /* allow for compilation as shared lib under BeOS */
@@ -464,7 +647,7 @@ typedef z_stream FAR *  png_zstreamp;
 #endif
 
 #ifndef PNG_EXPORT
-#define PNG_EXPORT(t,s) t s
+#define PNG_EXPORT(type,symbol) type symbol
 #endif
 
 
@@ -476,8 +659,8 @@ typedef z_stream FAR *  png_zstreamp;
 /* use this to make far-to-near assignments */
 #   define CHECK   1
 #   define NOCHECK 0
-#   define CVT_PTR(ptr) (far_to_near(png_ptr,ptr,CHECK))
-#   define CVT_PTR_NOCHECK(ptr) (far_to_near(png_ptr,ptr,NOCHECK))
+#   define CVT_PTR(ptr) (png_far_to_near(png_ptr,ptr,CHECK))
+#   define CVT_PTR_NOCHECK(ptr) (png_far_to_near(png_ptr,ptr,NOCHECK))
 #   define png_strlen _fstrlen
 #   define png_memcmp _fmemcmp      /* SJT: added */
 #   define png_memcpy _fmemcpy

pngerror.c

@@ -1,12 +1,12 @@
 
 /* pngerror.c - stub functions for i/o and memory allocation
  *
- * libpng 0.97
+ * libpng 1.0.1c
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * January 7, 1998
+ * May 9, 1998
  *
  * This file provides a location for all error handling.  Users which
  * need special error handling are expected to write replacement functions
@@ -59,7 +59,7 @@ png_warning(png_structp png_ptr, png_const_charp message)
  * if the character is invalid.
  */
 #define isnonalpha(c) ((c) < 41 || (c) > 122 || ((c) > 90 && (c) < 97))
-static const char png_digit[16] = {
+static PNG_CONST char png_digit[16] = {
    '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
 };
 
@@ -81,7 +81,7 @@ png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp message
    }
 
    if (message == NULL)
-      buffer[iout++] = 0;
+      buffer[iout] = 0;
    else {
       buffer[iout++] = ':';
       buffer[iout++] = ' ';
@@ -167,7 +167,7 @@ png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
 png_voidp
 png_get_error_ptr(png_structp png_ptr)
 {
-   return png_ptr->error_ptr;
+   return ((png_voidp)png_ptr->error_ptr);
 }
 
 

pngget.c

@@ -1,12 +1,12 @@
 
 /* pngget.c - retrieval of values from info struct
  *
- * libpng 0.97
+ * libpng 1.0.1c
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * January 7, 1998
+ * May 9, 1998
  */
 
 #define PNG_INTERNAL
@@ -15,7 +15,7 @@
 png_uint_32
 png_get_valid(png_structp png_ptr, png_infop info_ptr, png_uint_32 flag)
 {
-   if (info_ptr != NULL)
+   if (png_ptr != NULL && info_ptr != NULL)
       return(info_ptr->valid & flag);
    else
       return(0);
@@ -24,28 +24,307 @@ png_get_valid(png_structp png_ptr, png_infop info_ptr, png_uint_32 flag)
 png_uint_32
 png_get_rowbytes(png_structp png_ptr, png_infop info_ptr)
 {
-   if (info_ptr != NULL)
+   if (png_ptr != NULL && info_ptr != NULL)
       return(info_ptr->rowbytes);
    else
       return(0);
 }
 
+#ifdef PNG_EASY_ACCESS_SUPPORTED
+/* easy access to info, added in libpng-0.99 */
+png_uint_32
+png_get_image_width(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr != NULL && info_ptr != NULL)
+   {
+      return info_ptr->width;
+   }
+   return (0);
+}
+
+png_uint_32
+png_get_image_height(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr != NULL && info_ptr != NULL)
+   {
+      return info_ptr->height;
+   }
+   return (0);
+}
+
+png_byte
+png_get_bit_depth(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr != NULL && info_ptr != NULL)
+   {
+      return info_ptr->bit_depth;
+   }
+   return (0);
+}
+
+png_byte
+png_get_color_type(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr != NULL && info_ptr != NULL)
+   {
+      return info_ptr->color_type;
+   }
+   return (0);
+}
+
+png_byte
+png_get_filter_type(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr != NULL && info_ptr != NULL)
+   {
+      return info_ptr->filter_type;
+   }
+   return (0);
+}
+
+png_byte
+png_get_interlace_type(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr != NULL && info_ptr != NULL)
+   {
+      return info_ptr->interlace_type;
+   }
+   return (0);
+}
+
+png_byte
+png_get_compression_type(png_structp png_ptr, png_infop info_ptr)
+{
+   if (png_ptr != NULL && info_ptr != NULL)
+   {
+      return info_ptr->compression_type;
+   }
+   return (0);
+}
+
+png_uint_32
+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 && (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
+#endif
+   return (0);
+}
+
+png_uint_32
+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 && (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
+#endif
+   return (0);
+}
+
+png_uint_32
+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 && (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 ||
+         info_ptr->x_pixels_per_unit != info_ptr->y_pixels_per_unit)
+          return (0);
+      else return (info_ptr->x_pixels_per_unit);
+   }
+   else
+#endif
+   return (0);
+}
+
+float
+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 && (info_ptr->valid & PNG_INFO_pHYs))
+   {
+      png_debug1(1, "in %s retrieval function\n", "png_get_aspect_ratio");
+      if (info_ptr->x_pixels_per_unit == 0)
+         return ((float)0.0);
+      else
+         return ((float)info_ptr->y_pixels_per_unit
+            /(float)info_ptr->x_pixels_per_unit);
+   }
+   else
+#endif
+      return ((float)0.0);
+}
+
+png_uint_32
+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 && (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
+#endif
+   return (0);
+}
+
+png_uint_32
+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 && (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
+#endif
+   return (0);
+}
+
+png_uint_32
+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 && (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
+#endif
+   return (0);
+}
+
+png_uint_32
+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 && (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
+#endif
+   return (0);
+}
+
+#ifdef PNG_INCH_CONVERSIONS
+png_uint_32
+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)
+}
+
+png_uint_32
+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)
+}
+
+png_uint_32
+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)
+}
+
+float
+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)
+}
+
+float
+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)
+}
+
+#if defined(PNG_READ_pHYs_SUPPORTED)
+png_uint_32
+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)
+   {
+      png_debug1(1, "in %s retrieval function\n", "pHYs");
+      if (res_x != NULL)
+      {
+         *res_x = info_ptr->x_pixels_per_unit;
+         retval |= PNG_INFO_pHYs;
+      }
+      if (res_y != NULL)
+      {
+         *res_y = info_ptr->y_pixels_per_unit;
+         retval |= PNG_INFO_pHYs;
+      }
+      if (unit_type != NULL)
+      {
+         *unit_type = (int)info_ptr->phys_unit_type;
+         retval |= PNG_INFO_pHYs;
+         if(unit_type == 1)
+         {
+            if (res_x != NULL) *res_x = (png_uint_32)(*res_x * 39.37 + .50);
+            if (res_y != NULL) *res_y = (png_uint_32)(*res_y * 39.37 + .50);
+         }
+      }
+   }
+   return (retval);
+}
+#endif
+
+#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_get_channels(png_structp png_ptr, png_infop info_ptr)
 {
-   if (info_ptr != NULL)
+   if (png_ptr != NULL && info_ptr != NULL)
       return(info_ptr->channels);
    else
-      return(0);
+      return (0);
 }
 
 png_bytep
 png_get_signature(png_structp png_ptr, png_infop info_ptr)
 {
-   if (info_ptr != NULL)
+   if (png_ptr != NULL && info_ptr != NULL)
       return(info_ptr->signature);
    else
-      return(NULL);
+      return (NULL);
 }
 
 #if defined(PNG_READ_bKGD_SUPPORTED)
@@ -53,8 +332,8 @@ png_uint_32
 png_get_bKGD(png_structp png_ptr, png_infop info_ptr,
    png_color_16p *background)
 {
-   if (info_ptr != NULL && info_ptr->valid & PNG_INFO_bKGD &&
-      background != NULL)
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD)
+      && background != NULL)
    {
       png_debug1(1, "in %s retrieval function\n", "bKGD");
       *background = &(info_ptr->background);
@@ -70,7 +349,7 @@ 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)
 {
-   if (info_ptr != NULL && info_ptr->valid & PNG_INFO_cHRM)
+   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)
@@ -99,8 +378,8 @@ png_get_cHRM(png_structp png_ptr, png_infop info_ptr,
 png_uint_32
 png_get_gAMA(png_structp png_ptr, png_infop info_ptr, double *file_gamma)
 {
-   if (info_ptr != NULL && info_ptr->valid & PNG_INFO_gAMA &&
-      file_gamma != NULL)
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
+      && file_gamma != NULL)
    {
       png_debug1(1, "in %s retrieval function\n", "gAMA");
       *file_gamma = (double)info_ptr->gamma;
@@ -112,14 +391,13 @@ png_get_gAMA(png_structp png_ptr, png_infop info_ptr, double *file_gamma)
 
 #if defined(PNG_READ_sRGB_SUPPORTED)
 png_uint_32
-png_get_sRGB(png_structp png_ptr, png_infop info_ptr, png_bytep
-    file_srgb_intent)
+png_get_sRGB(png_structp png_ptr, png_infop info_ptr, int *file_srgb_intent)
 {
-   if (info_ptr != NULL && info_ptr->valid & PNG_INFO_sRGB &&
-      file_srgb_intent != NULL)
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB)
+      && file_srgb_intent != NULL)
    {
       png_debug1(1, "in %s retrieval function\n", "sRGB");
-      *file_srgb_intent = info_ptr->srgb_intent;
+      *file_srgb_intent = (int)info_ptr->srgb_intent;
       return (PNG_INFO_sRGB);
    }
    return (0);
@@ -130,7 +408,8 @@ png_get_sRGB(png_structp png_ptr, png_infop info_ptr, png_bytep
 png_uint_32
 png_get_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p *hist)
 {
-   if (info_ptr != NULL && info_ptr->valid & PNG_INFO_hIST && hist != NULL)
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST)
+      && hist != NULL)
    {
       png_debug1(1, "in %s retrieval function\n", "hIST");
       *hist = info_ptr->hist;
@@ -147,9 +426,12 @@ png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
    int *filter_type)
    
 {
-   if (info_ptr != NULL && width != NULL && height != NULL &&
+   if (png_ptr != NULL && info_ptr != NULL && width != NULL && height != NULL &&
       bit_depth != NULL && color_type != NULL)
    {
+      int pixel_depth, channels;
+      png_uint_32 rowbytes_per_pixel;
+
       png_debug1(1, "in %s retrieval function\n", "IHDR");
       *width = info_ptr->width;
       *height = info_ptr->height;
@@ -161,6 +443,23 @@ png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
          *filter_type = info_ptr->filter_type;
       if (interlace_type != NULL)
          *interlace_type = info_ptr->interlace_type;
+
+      /* check for potential overflow of rowbytes */
+      if (*color_type == PNG_COLOR_TYPE_PALETTE)
+         channels = 1;
+      else if (*color_type & PNG_COLOR_MASK_COLOR)
+         channels = 3;
+      else
+         channels = 1;
+      if (*color_type & PNG_COLOR_MASK_ALPHA)
+         channels++;
+      pixel_depth = *bit_depth * channels;
+      rowbytes_per_pixel = (pixel_depth + 7) >> 3;
+      if ((*width > (png_uint_32)2147483647L/rowbytes_per_pixel))
+      {
+         png_warning(png_ptr,
+            "Width too large for libpng to process image data.");
+      }
       return (1);
    }
    return (0);
@@ -171,8 +470,8 @@ png_uint_32
 png_get_oFFs(png_structp png_ptr, png_infop info_ptr,
    png_uint_32 *offset_x, png_uint_32 *offset_y, int *unit_type)
 {
-   if (info_ptr != NULL && info_ptr->valid & PNG_INFO_oFFs &&
-      offset_x != NULL && offset_y != NULL && unit_type != NULL)
+   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)
+      && offset_x != NULL && offset_y != NULL && unit_type != NULL)
    {
       png_debug1(1, "in %s retrieval function\n", "oFFs");
       *offset_x = info_ptr->x_offset;
@@ -190,7 +489,7 @@ 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 (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 &&
       nparams != NULL && units != NULL && params != NULL)
    {
@@ -215,12 +514,16 @@ png_get_pHYs(png_structp png_ptr, png_infop info_ptr,
 {
    png_uint_32 retval = 0;
 
-   if (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 && res_y != NULL)
+      if (res_x != NULL)
       {
          *res_x = info_ptr->x_pixels_per_unit;
+         retval |= PNG_INFO_pHYs;
+      }
+      if (res_y != NULL)
+      {
          *res_y = info_ptr->y_pixels_per_unit;
          retval |= PNG_INFO_pHYs;
       }
@@ -229,9 +532,8 @@ png_get_pHYs(png_structp png_ptr, png_infop info_ptr,
          *unit_type = (int)info_ptr->phys_unit_type;
          retval |= PNG_INFO_pHYs;
       }
-      return (retval);
    }
-   return (0);
+   return (retval);
 }
 #endif
 
@@ -239,7 +541,8 @@ png_uint_32
 png_get_PLTE(png_structp png_ptr, png_infop info_ptr, png_colorp *palette,
    int *num_palette)
 {
-   if (info_ptr != NULL && info_ptr->valid & PNG_INFO_PLTE && palette != NULL)
+   if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_PLTE &&
+       palette != NULL)
    {
       png_debug1(1, "in %s retrieval function\n", "PLTE");
       *palette = info_ptr->palette;
@@ -254,7 +557,8 @@ png_get_PLTE(png_structp png_ptr, png_infop info_ptr, png_colorp *palette,
 png_uint_32
 png_get_sBIT(png_structp png_ptr, png_infop info_ptr, png_color_8p *sig_bit)
 {
-   if (info_ptr != NULL && info_ptr->valid & PNG_INFO_sBIT && sig_bit != NULL)
+   if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_sBIT &&
+       sig_bit != NULL)
    {
       png_debug1(1, "in %s retrieval function\n", "sBIT");
       *sig_bit = &(info_ptr->sig_bit);
@@ -269,10 +573,11 @@ png_uint_32
 png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr,
    int *num_text)
 {
-   if ((info_ptr != NULL) || (info_ptr->num_text > 0))
+   if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0)
    {
       png_debug1(1, "in %s retrieval function\n",
-         (png_ptr->chunk_name[0] == '\0' ? "text" : png_ptr->chunk_name));
+         (png_ptr->chunk_name[0] == '\0' ? "text"
+             : (png_const_charp)png_ptr->chunk_name));
       if (text_ptr != NULL)
          *text_ptr = info_ptr->text;
       if (num_text != NULL)
@@ -287,7 +592,8 @@ png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr,
 png_uint_32
 png_get_tIME(png_structp png_ptr, png_infop info_ptr, png_timep *mod_time)
 {
-   if (info_ptr != NULL && info_ptr->valid & PNG_INFO_tIME && mod_time != NULL)
+   if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_tIME &&
+       mod_time != NULL)
    {
       png_debug1(1, "in %s retrieval function\n", "tIME");
       *mod_time = &(info_ptr->mod_time);
@@ -302,25 +608,37 @@ png_uint_32
 png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
    png_bytep *trans, int *num_trans, png_color_16p *trans_values)
 {
-   if (info_ptr != NULL && info_ptr->valid & PNG_INFO_tRNS)
+   png_uint_32 retval = 0;
+   if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_tRNS)
    {
       png_debug1(1, "in %s retrieval function\n", "tRNS");
-      if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE && trans != NULL)
+      if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
       {
-          *trans = info_ptr->trans;
+          if (trans != NULL)
+          {
+             *trans = info_ptr->trans;
+             retval |= PNG_INFO_tRNS;
+          }
+          if (trans_values != NULL)
+             *trans_values = &(info_ptr->trans_values);
       }
-      else if (trans_values != NULL)
+      else /* if (info_ptr->color_type != PNG_COLOR_TYPE_PALETTE) */
       {
-         *trans_values = &(info_ptr->trans_values);
+          if (trans_values != NULL)
+          {
+             *trans_values = &(info_ptr->trans_values);
+             retval |= PNG_INFO_tRNS;
+          }
+          if(trans != NULL)
+             *trans = NULL;
       }
-      else
+      if(num_trans != NULL)
       {
-         return (0);
+         *num_trans = info_ptr->num_trans;
+         retval |= PNG_INFO_tRNS;
       }
-      *num_trans = info_ptr->num_trans;
-      return (PNG_INFO_tRNS);
    }
-   return (0);
+   return (retval);
 }
 #endif
 

pngmem.c

@@ -1,14 +1,14 @@
 
 /* pngmem.c - stub functions for memory allocation
  *
- * libpng 0.97
+ * libpng 1.0.1c
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * January 7, 1998
+ * May 9, 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
  * to meet their needs.  See the instructions at each function.
  */
@@ -16,6 +16,16 @@
 #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 */
@@ -33,7 +43,7 @@ png_create_struct(int type)
    else if (type == PNG_STRUCT_PNG)
      size = sizeof(png_struct);
    else
-     return (png_voidp)NULL;
+     return ((png_voidp)NULL);
 
    if ((struct_ptr = (png_voidp)farmalloc(size)) != NULL)
    {
@@ -49,7 +59,10 @@ void
 png_destroy_struct(png_voidp struct_ptr)
 {
    if (struct_ptr != NULL)
+   {
       farfree (struct_ptr);
+      struct_ptr = NULL;
+   }
 }
 
 /* Allocate memory.  For reasonable files, size should never exceed
@@ -72,11 +85,11 @@ png_destroy_struct(png_voidp struct_ptr)
  * (which should cause a fatal error) and introducing major problems.
  */
 png_voidp
-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 ((voidp)NULL);
+      return ((png_voidp)NULL);
 
 #ifdef PNG_MAX_MALLOC_64K
    if (size > (png_uint_32)65536L)
@@ -98,8 +111,10 @@ png_malloc(png_structp png_ptr, png_uint_32 size)
             png_byte huge * hptr;
 
             if (ret != NULL)
+            {
                farfree(ret);
-            ret = NULL;
+               ret = NULL;
+            }
 
             num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14));
             if (num_blocks < 1)
@@ -115,7 +130,7 @@ png_malloc(png_structp png_ptr, png_uint_32 size)
 
             if (table == NULL)
             {
-               png_error(png_ptr, "Out of Memory");
+               png_error(png_ptr, "Out Of Memory."); /* Note "O" and "M" */
             }
 
             if ((png_size_t)table & 0xfff0)
@@ -129,7 +144,7 @@ png_malloc(png_structp png_ptr, png_uint_32 size)
 
             if (png_ptr->offset_table_ptr == NULL)
             {
-               png_error(png_ptr, "Out of memory");
+               png_error(png_ptr, "Out Of memory.");
             }
 
             hptr = (png_byte huge *)table;
@@ -151,7 +166,7 @@ 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");
+         png_error(png_ptr, "Out of Memory.");
 
       ret = png_ptr->offset_table_ptr[png_ptr->offset_table_count++];
    }
@@ -160,17 +175,17 @@ png_malloc(png_structp png_ptr, png_uint_32 size)
 
    if (ret == NULL)
    {
-      png_error(png_ptr, "Out of Memory");
+      png_error(png_ptr, "Out of memory."); /* Note "o" and "m" */
    }
 
-   return ret;
+   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
-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;
@@ -198,7 +213,10 @@ png_free(png_structp png_ptr, png_voidp ptr)
    }
 
    if (ptr != NULL)
+   {
       farfree(ptr);
+      ptr = NULL;
+   }
 }
 
 #else /* Not the Borland DOS special memory handler */
@@ -217,7 +235,7 @@ png_create_struct(int type)
    else if (type == PNG_STRUCT_PNG)
       size = sizeof(png_struct);
    else
-      return (png_voidp)NULL;
+      return ((png_voidp)NULL);
 
 #if defined(__TURBOC__) && !defined(__FLAT__)
    if ((struct_ptr = (png_voidp)farmalloc(size)) != NULL)
@@ -241,6 +259,7 @@ void
 png_destroy_struct(png_voidp struct_ptr)
 {
    if (struct_ptr != NULL)
+   {
 #if defined(__TURBOC__) && !defined(__FLAT__)
       farfree(struct_ptr);
 #else
@@ -250,6 +269,7 @@ png_destroy_struct(png_voidp struct_ptr)
       free(struct_ptr);
 # endif
 #endif
+   }
 }
 
 
@@ -260,11 +280,12 @@ png_destroy_struct(png_voidp struct_ptr)
    have the ability to do that. */
 
 png_voidp
-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 (NULL);
+      return ((png_voidp)NULL);
 
 #ifdef PNG_MAX_MALLOC_64K
    if (size > (png_uint_32)65536L)
@@ -272,12 +293,12 @@ png_malloc(png_structp png_ptr, png_uint_32 size)
 #endif
 
 #if defined(__TURBOC__) && !defined(__FLAT__)
-   ret = farmalloc((png_size_t)size);
+   ret = farmalloc(size);
 #else
 # if defined(_MSC_VER) && defined(MAXSEG_64K)
    ret = halloc(size, 1);
 # else
-   ret = malloc(size);
+   ret = malloc((size_t)size);
 # endif
 #endif
 
@@ -286,14 +307,14 @@ png_malloc(png_structp png_ptr, png_uint_32 size)
       png_error(png_ptr, "Out of Memory");
    }
 
-   return ret;
+   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
-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;
@@ -311,3 +332,29 @@ png_free(png_structp png_ptr, png_voidp ptr)
 
 #endif /* Not Borland DOS special memory handler */
 
+png_voidp
+png_memcpy_check (png_structp png_ptr, png_voidp s1, png_voidp s2,
+   png_uint_32 length)
+{
+   png_size_t size;
+
+   size = (png_size_t)length;
+   if ((png_uint_32)size != length)
+      png_error(png_ptr,"Overflow in png_memcpy_check.");
+  
+   return(png_memcpy (s1, s2, size));
+}
+
+png_voidp
+png_memset_check (png_structp png_ptr, png_voidp s1, int value,
+   png_uint_32 length)
+{
+   png_size_t size;
+
+   size = (png_size_t)length;
+   if ((png_uint_32)size != length)
+      png_error(png_ptr,"Overflow in png_memset_check.");
+
+   return (png_memset (s1, value, size));
+
+}

pngpread.c

@@ -1,12 +1,12 @@
 
 /* pngpread.c - read a png file in push mode
  *
- * libpng 0.97
+ * 1.0.1c
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * January 7, 1998
+ * May 9, 1998
  */
 
 #define PNG_INTERNAL
@@ -446,13 +446,13 @@ png_push_save_buffer(png_structp png_ptr)
    {
       if (png_ptr->save_buffer_ptr != png_ptr->save_buffer)
       {
-         png_size_t i;
+         png_size_t i,istop;
          png_bytep sp;
          png_bytep dp;
 
+         istop = png_ptr->save_buffer_size;
          for (i = 0, sp = png_ptr->save_buffer_ptr, dp = png_ptr->save_buffer;
-            i < png_ptr->save_buffer_size;
-            i++, sp++, dp++)
+            i < istop; i++, sp++, dp++)
          {
             *dp = *sp;
          }
@@ -466,7 +466,8 @@ png_push_save_buffer(png_structp png_ptr)
 
       new_max = png_ptr->save_buffer_size + png_ptr->current_buffer_size + 256;
       old_buffer = png_ptr->save_buffer;
-      png_ptr->save_buffer = (png_bytep)png_malloc(png_ptr, new_max);
+      png_ptr->save_buffer = (png_bytep)png_malloc(png_ptr, 
+         (png_uint_32)new_max);
       png_memcpy(png_ptr->save_buffer, old_buffer, png_ptr->save_buffer_size);
       png_free(png_ptr, old_buffer);
       png_ptr->save_buffer_max = new_max;
@@ -527,7 +528,12 @@ png_push_read_IDAT(png_structp png_ptr)
       png_size_t save_size;
 
       if (png_ptr->idat_size < (png_uint_32)png_ptr->save_buffer_size)
-         save_size = png_ptr->idat_size;
+      {
+         save_size = (png_size_t)png_ptr->idat_size;
+         /* check for overflow */
+         if((png_uint_32)save_size != png_ptr->idat_size)
+            png_error(png_ptr, "save_size overflowed in pngpread");
+      }
       else
          save_size = png_ptr->save_buffer_size;
 
@@ -544,7 +550,12 @@ png_push_read_IDAT(png_structp png_ptr)
       png_size_t save_size;
 
       if (png_ptr->idat_size < (png_uint_32)png_ptr->current_buffer_size)
-         save_size = png_ptr->idat_size;
+      {
+         save_size = (png_size_t)png_ptr->idat_size;
+         /* check for overflow */
+         if((png_uint_32)save_size != png_ptr->idat_size)
+            png_error(png_ptr, "save_size overflowed in pngpread");
+      }
       else
          save_size = png_ptr->current_buffer_size;
 
@@ -580,7 +591,7 @@ png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,
 
    png_ptr->zstream.next_in = buffer;
    png_ptr->zstream.avail_in = (uInt)buffer_length;
-   while(1)
+   for(;;)
    {
       ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
       if (ret == Z_STREAM_END)
@@ -619,6 +630,7 @@ png_push_process_row(png_structp png_ptr)
    png_ptr->row_info.channels = png_ptr->channels;
    png_ptr->row_info.bit_depth = png_ptr->bit_depth;
    png_ptr->row_info.pixel_depth = png_ptr->pixel_depth;
+   
    png_ptr->row_info.rowbytes = ((png_ptr->row_info.width *
       (png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3);
 
@@ -626,7 +638,8 @@ png_push_process_row(png_structp png_ptr)
       png_ptr->row_buf + 1, png_ptr->prev_row + 1,
       (int)(png_ptr->row_buf[0]));
 
-   png_memcpy(png_ptr->prev_row, png_ptr->row_buf, png_ptr->rowbytes + 1);
+   png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
+      png_ptr->rowbytes + 1);
 
    if (png_ptr->transformations)
       png_do_read_transformations(png_ptr);
@@ -761,7 +774,8 @@ png_read_push_finish_row(png_structp png_ptr)
    if (png_ptr->interlaced)
    {
       png_ptr->row_number = 0;
-      png_memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
+      png_memset_check(png_ptr, png_ptr->prev_row, 0,
+         png_ptr->rowbytes + 1);
       do
       {
          png_ptr->pass++;
@@ -771,8 +785,10 @@ png_read_push_finish_row(png_structp png_ptr)
             png_pass_inc[png_ptr->pass] - 1 -
             png_pass_start[png_ptr->pass]) /
             png_pass_inc[png_ptr->pass];
+
          png_ptr->irowbytes = ((png_ptr->iwidth *
             png_ptr->pixel_depth + 7) >> 3) + 1;
+
          if (!(png_ptr->transformations & PNG_INTERLACE))
          {
             png_ptr->num_rows = (png_ptr->height +
@@ -793,7 +809,11 @@ void
 png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 {
    if (png_ptr->mode == PNG_BEFORE_IHDR || png_ptr->mode & PNG_HAVE_IEND)
-      png_error(png_ptr, "Out of place tEXt");
+      {
+         png_error(png_ptr, "Out of place tEXt");
+         /* to quiet some compiler warnings */
+         if(info_ptr == NULL) return;
+      }
 
 #ifdef PNG_MAX_MALLOC_64K
    png_ptr->skip_length = 0;  /* This may not be necessary */
@@ -806,11 +826,12 @@ png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length
    }
 #endif
 
-   png_ptr->current_text = (png_charp)png_malloc(png_ptr, length+1);
+   png_ptr->current_text = (png_charp)png_malloc(png_ptr, 
+         (png_uint_32)(length+1));
    png_ptr->current_text[length] = '\0';
    png_ptr->current_text_ptr = png_ptr->current_text;
-   png_ptr->current_text_size = length;
-   png_ptr->current_text_left = length;
+   png_ptr->current_text_size = (png_size_t)length;
+   png_ptr->current_text_left = (png_size_t)length;
    png_ptr->process_mode = PNG_READ_tEXt_MODE;
 }
 
@@ -857,7 +878,7 @@ png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)
       if (text != key + png_ptr->current_text_size)
          text++;
 
-      text_ptr = (png_textp)png_malloc(png_ptr, sizeof(png_text));
+      text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
       text_ptr->compression = PNG_TEXT_COMPRESSION_NONE;
       text_ptr->key = key;
       text_ptr->text = text;
@@ -874,7 +895,11 @@ void
 png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
 {
    if (png_ptr->mode == PNG_BEFORE_IHDR || png_ptr->mode & PNG_HAVE_IEND)
-      png_error(png_ptr, "Out of place zTXt");
+      {
+         png_error(png_ptr, "Out of place zTXt");
+         /* to quiet some compiler warnings */
+         if(info_ptr == NULL) return;
+      }
 
 #ifdef PNG_MAX_MALLOC_64K
    /* We can't handle zTXt chunks > 64K, since we don't have enough space
@@ -889,11 +914,12 @@ png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length
    }
 #endif
 
-   png_ptr->current_text = (png_charp)png_malloc(png_ptr, length+1);
+   png_ptr->current_text = (png_charp)png_malloc(png_ptr,
+       (png_uint_32)(length+1));
    png_ptr->current_text[length] = '\0';
    png_ptr->current_text_ptr = png_ptr->current_text;
-   png_ptr->current_text_size = length;
-   png_ptr->current_text_left = length;
+   png_ptr->current_text_size = (png_size_t)length;
+   png_ptr->current_text_left = (png_size_t)length;
    png_ptr->process_mode = PNG_READ_zTXt_MODE;
 }
 
@@ -955,7 +981,7 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
       png_ptr->zstream.avail_in = (uInt)(png_ptr->current_text_size -
          (text - key));
       png_ptr->zstream.next_out = png_ptr->zbuf;
-      png_ptr->zstream.avail_out = png_ptr->zbuf_size;
+      png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
 
       key_size = text - key;
       text_size = 0;
@@ -978,8 +1004,8 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
             if (text == NULL)
             {
                text = (png_charp)png_malloc(png_ptr,
-                  png_ptr->zbuf_size - png_ptr->zstream.avail_out +
-                     key_size + 1);
+                  (png_uint_32)(png_ptr->zbuf_size - png_ptr->zstream.avail_out +
+                     key_size + 1));
                png_memcpy(text + key_size, png_ptr->zbuf,
                   png_ptr->zbuf_size - png_ptr->zstream.avail_out);
                png_memcpy(text, key, key_size);
@@ -992,8 +1018,9 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
                png_charp tmp;
 
                tmp = text;
-               text = png_malloc(png_ptr, text_size +
-                  png_ptr->zbuf_size - png_ptr->zstream.avail_out + 1);
+               text = (png_charp)png_malloc(png_ptr, text_size +
+                  (png_uint_32)(png_ptr->zbuf_size - png_ptr->zstream.avail_out
+                   + 1));
                png_memcpy(text, tmp, text_size);
                png_free(png_ptr, tmp);
                png_memcpy(text + text_size, png_ptr->zbuf,
@@ -1029,9 +1056,8 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
       png_free(png_ptr, key);
       key = text;
       text += key_size;
-      text_size -= key_size;
 
-      text_ptr = (png_textp)png_malloc(png_ptr, sizeof(png_text));
+      text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
       text_ptr->compression = PNG_TEXT_COMPRESSION_zTXt;
       text_ptr->key = key;
       text_ptr->text = text;
@@ -1058,6 +1084,8 @@ png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 len
    if (!(png_ptr->chunk_name[0] & 0x20))
    {
       png_chunk_error(png_ptr, "unknown critical chunk");
+      /* to quiet some compiler warnings */
+      if(info_ptr == NULL) return;
    }
 
    png_push_crc_skip(png_ptr, length);

pngread.c

@@ -1,12 +1,12 @@
 
 /* pngread.c - read a PNG file
  *
- * libpng 0.97
+ * 1.0.1c
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * January 7, 1998
+ * May 9, 1998
  *
  * This file contains routines that an application calls directly to
  * read a PNG file or stream.
@@ -58,7 +58,8 @@ png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr,
 
    /* initialize zbuf - compression buffer */
    png_ptr->zbuf_size = PNG_ZBUF_SIZE;
-   png_ptr->zbuf = png_malloc(png_ptr, png_ptr->zbuf_size);
+   png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
+     (png_uint_32)png_ptr->zbuf_size);
    png_ptr->zstream.zalloc = png_zalloc;
    png_ptr->zstream.zfree = png_zfree;
    png_ptr->zstream.opaque = (voidpf)png_ptr;
@@ -81,7 +82,7 @@ png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr,
 }
 
 /* Initialize PNG structure for reading, and allocate any memory needed.
-   This interface is depreciated in favour of the png_create_read_struct(),
+   This interface is deprecated in favour of the png_create_read_struct(),
    and it will eventually disappear. */
 void
 png_read_init(png_structp png_ptr)
@@ -100,7 +101,8 @@ png_read_init(png_structp png_ptr)
 
    /* initialize zbuf - compression buffer */
    png_ptr->zbuf_size = PNG_ZBUF_SIZE;
-   png_ptr->zbuf = png_malloc(png_ptr, png_ptr->zbuf_size);
+   png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
+     (png_uint_32)png_ptr->zbuf_size);
    png_ptr->zstream.zalloc = png_zalloc;
    png_ptr->zstream.zfree = png_zfree;
    png_ptr->zstream.opaque = (voidpf)png_ptr;
@@ -121,9 +123,9 @@ png_read_init(png_structp png_ptr)
 }
 
 /* Read the information before the actual image data.  This has been
- * changed in v0.90 to allow reading a file which already has the magic
+ * changed in v0.90 to allow reading a file that already has the magic
  * bytes read from the stream.  You can tell libpng how many bytes have
- * been read from the beginning of the stream (up to the maxumum of 8)
+ * been read from the beginning of the stream (up to the maximum of 8)
  * via png_set_sig_bytes(), and we will only check the remaining bytes
  * here.  The application can then have access to the signature bytes we
  * read if it is determined that this isn't a valid PNG file.
@@ -152,7 +154,7 @@ png_read_info(png_structp png_ptr, png_infop info_ptr)
       }
    }
 
-   while (1)
+   for(;;)
    {
       png_byte chunk_length[4];
       png_uint_32 length;
@@ -277,6 +279,38 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
    /* save jump buffer and error functions */
    if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
       png_read_start_row(png_ptr);
+   if (png_ptr->row_number == 0 && png_ptr->pass == 0)
+   {
+   /* check for transforms that have been set but were defined out */
+#if defined(PNG_WRITE_INVERT_SUPPORTED) && !defined(PNG_READ_INVERT_SUPPORTED)
+   if (png_ptr->transformations & PNG_INVERT_MONO)
+      png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined.");
+#endif
+#if defined(PNG_WRITE_FILLER_SUPPORTED) && !defined(PNG_READ_FILLER_SUPPORTED)
+   if (png_ptr->transformations & PNG_FILLER)
+      png_warning(png_ptr, "PNG_READ_FILLER_SUPPORTED is not defined.");
+#endif
+#if defined(PNG_WRITE_PACKSWAP_SUPPORTED) && !defined(PNG_READ_PACKSWAP_SUPPORTED)
+   if (png_ptr->transformations & PNG_PACKSWAP)
+      png_warning(png_ptr, "PNG_READ_PACKSWAP_SUPPORTED is not defined.");
+#endif
+#if defined(PNG_WRITE_PACK_SUPPORTED) && !defined(PNG_READ_PACK_SUPPORTED)
+   if (png_ptr->transformations & PNG_PACK)
+      png_warning(png_ptr, "PNG_READ_PACK_SUPPORTED is not defined.");
+#endif
+#if defined(PNG_WRITE_SHIFT_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED)
+   if (png_ptr->transformations & PNG_SHIFT)
+      png_warning(png_ptr, "PNG_READ_SHIFT_SUPPORTED is not defined.");
+#endif
+#if defined(PNG_WRITE_BGR_SUPPORTED) && !defined(PNG_READ_BGR_SUPPORTED)
+   if (png_ptr->transformations & PNG_BGR)
+      png_warning(png_ptr, "PNG_READ_BGR_SUPPORTED is not defined.");
+#endif
+#if defined(PNG_WRITE_SWAP_SUPPORTED) && !defined(PNG_READ_SWAP_SUPPORTED)
+   if (png_ptr->transformations & PNG_SWAP_BYTES)
+      png_warning(png_ptr, "PNG_READ_SWAP_SUPPORTED is not defined.");
+#endif
+   }
 
 #if defined(PNG_READ_INTERLACING_SUPPORTED)
    /* if interlaced and we do not need a new row, combine row and return */
@@ -407,14 +441,17 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
    png_ptr->row_info.channels = png_ptr->channels;
    png_ptr->row_info.bit_depth = png_ptr->bit_depth;
    png_ptr->row_info.pixel_depth = png_ptr->pixel_depth;
-   png_ptr->row_info.rowbytes = ((png_ptr->row_info.width *
-      (png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3);
+   {
+      png_ptr->row_info.rowbytes = ((png_ptr->row_info.width *
+         (png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3);
+   }
 
    png_read_filter_row(png_ptr, &(png_ptr->row_info),
       png_ptr->row_buf + 1, png_ptr->prev_row + 1,
       (int)(png_ptr->row_buf[0]));
 
-   png_memcpy(png_ptr->prev_row, png_ptr->row_buf, png_ptr->rowbytes + 1);
+   png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
+      png_ptr->rowbytes + 1);
 
    if (png_ptr->transformations)
       png_do_read_transformations(png_ptr);
@@ -444,6 +481,9 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
          png_combine_row(png_ptr, dsp_row, 0xff);
    }
    png_read_finish_row(png_ptr);
+
+   if (png_ptr->read_row_fn != NULL)
+      (*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
 }
 
 /* Read one or more rows of image data.  If the image is interlaced,
@@ -480,25 +520,34 @@ png_read_rows(png_structp png_ptr, png_bytepp row,
    /* save jump buffer and error functions */
    rp = row;
    dp = display_row;
-   for (i = 0; i < num_rows; i++)
-   {
-      png_bytep rptr;
-      png_bytep dptr;
-
-      if (rp != NULL)
-         rptr = *rp;
-      else
-         rptr = NULL;
-      if (dp != NULL)
-         dptr = *dp;
-      else
-         dptr = NULL;
-      png_read_row(png_ptr, rptr, dptr);
-      if (row != NULL)
-         rp++;
-      if (display_row != NULL)
-         dp++;
-   }
+   if(rp != NULL && dp != NULL)
+      for (i = 0; i < num_rows; i++)
+      {
+         png_bytep rptr = *rp++;
+         png_bytep dptr = *dp++;
+   
+         png_read_row(png_ptr, rptr, dptr);
+      }
+   else
+      for (i = 0; i < num_rows; i++)
+      {
+         png_bytep rptr;
+         png_bytep dptr;
+   
+         if (rp != NULL)
+            rptr = *rp;
+         else
+            rptr = NULL;
+         if (dp != NULL)
+            dptr = *dp;
+         else
+            dptr = NULL;
+         png_read_row(png_ptr, rptr, dptr);
+         if (row != NULL)
+            rp++;
+         if (display_row != NULL)
+            dp++;
+      }
 }
 
 /* Read the entire image.  If the image has an alpha channel or a tRNS
@@ -514,7 +563,7 @@ png_read_rows(png_structp png_ptr, png_bytepp row,
 void
 png_read_image(png_structp png_ptr, png_bytepp image)
 {
-   png_uint_32 i;
+   png_uint_32 i,image_height;
    int pass, j;
    png_bytepp rp;
 
@@ -522,12 +571,13 @@ png_read_image(png_structp png_ptr, png_bytepp image)
    /* save jump buffer and error functions */
    pass = png_set_interlace_handling(png_ptr);
 
-   png_ptr->num_rows = png_ptr->height; /* Make sure this is set correctly */
+   image_height=png_ptr->height;
+   png_ptr->num_rows = image_height; /* Make sure this is set correctly */
 
    for (j = 0; j < pass; j++)
    {
       rp = image;
-      for (i = 0; i < png_ptr->height; i++)
+      for (i = 0; i < image_height; i++)
       {
          png_read_row(png_ptr, *rp, NULL);
          rp++;
@@ -655,12 +705,18 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
 
    if (info_ptr != NULL)
    {
+#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
+      png_free(png_ptr, info_ptr->text);
+#endif
       png_destroy_struct((png_voidp)info_ptr);
       *info_ptr_ptr = (png_infop)NULL;
    }
 
    if (end_info_ptr != NULL)
    {
+#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
+      png_free(png_ptr, end_info_ptr->text);
+#endif
       png_destroy_struct((png_voidp)end_info_ptr);
       *end_info_ptr_ptr = (png_infop)NULL;
    }
@@ -704,11 +760,9 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
    png_free(png_ptr, png_ptr->gamma_to_1);
 #endif
    if (png_ptr->flags & PNG_FLAG_FREE_PALETTE)
-      png_free(png_ptr, png_ptr->palette);
-#if defined(PNG_READ_BACKGROUND_SUPPORTED) && defined(PNG_READ_bKGD_SUPPORTED)
+      png_zfree(png_ptr, png_ptr->palette);
    if (png_ptr->flags & PNG_FLAG_FREE_TRANS)
       png_free(png_ptr, png_ptr->trans);
-#endif
 #if defined(PNG_READ_hIST_SUPPORTED)
    if (png_ptr->flags & PNG_FLAG_FREE_HIST)
       png_free(png_ptr, png_ptr->hist);
@@ -717,7 +771,8 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
    if (png_ptr->gamma_16_table != NULL)
    {
       int i;
-      for (i = 0; i < (1 << (8 - png_ptr->gamma_shift)); i++)
+      int istop = (1 << (8 - png_ptr->gamma_shift));
+      for (i = 0; i < istop; i++)
       {
          png_free(png_ptr, png_ptr->gamma_16_table[i]);
       }
@@ -728,7 +783,8 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
    if (png_ptr->gamma_16_from_1 != NULL)
    {
       int i;
-      for (i = 0; i < (1 << (8 - png_ptr->gamma_shift)); i++)
+      int istop = (1 << (8 - png_ptr->gamma_shift));
+      for (i = 0; i < istop; i++)
       {
          png_free(png_ptr, png_ptr->gamma_16_from_1[i]);
       }
@@ -737,7 +793,8 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
    if (png_ptr->gamma_16_to_1 != NULL)
    {
       int i;
-      for (i = 0; i < (1 << (8 - png_ptr->gamma_shift)); i++)
+      int istop = (1 << (8 - png_ptr->gamma_shift));
+      for (i = 0; i < istop; i++)
       {
          png_free(png_ptr, png_ptr->gamma_16_to_1[i]);
       }
@@ -767,3 +824,9 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
 
    png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf));
 }
+
+void
+png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn)
+{
+   png_ptr->read_row_fn = read_row_fn;
+}

pngrio.c

@@ -1,12 +1,12 @@
 
 /* pngrio.c - functions for data input
  *
- * libpng 0.97
+ * libpng 1.0.1c
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * January 7, 1998
+ * May 9, 1998
  *
  * This file provides a location for all input.  Users which need
  * special handling are expected to write a function which has the same
@@ -99,7 +99,7 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
       }
       while (remaining != 0);
    }
-   if (check != length)
+   if ((png_uint_32)check != (png_uint_32)length)
    {
       png_error(png_ptr, "read Error");
    }

pngset.c

@@ -1,12 +1,12 @@
 
 /* pngset.c - storage of image information into info struct
  *
- * libpng 0.97
+ * 1.0.1c
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * January 7, 1998
+ * May 9, 1998
  *
  * The functions here are used during reads to store data from the file
  * into the info struct, and during writes to store application data
@@ -22,7 +22,7 @@ void
 png_set_bKGD(png_structp png_ptr, png_infop info_ptr, png_color_16p background)
 {
    png_debug1(1, "in %s storage function\n", "bKGD");
-   if (info_ptr == NULL)
+   if (png_ptr == NULL || info_ptr == NULL)
       return;
 
    png_memcpy(&(info_ptr->background), background, sizeof(png_color_16));
@@ -37,7 +37,7 @@ png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
    double green_x, double green_y, double blue_x, double blue_y)
 {
    png_debug1(1, "in %s storage function\n", "cHRM");
-   if (info_ptr == NULL)
+   if (png_ptr == NULL || info_ptr == NULL)
       return;
 
    info_ptr->x_white = (float)white_x;
@@ -57,7 +57,7 @@ void
 png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
 {
    png_debug1(1, "in %s storage function\n", "gAMA");
-   if (info_ptr == NULL)
+   if (png_ptr == NULL || info_ptr == NULL)
       return;
 
    info_ptr->gamma = (float)file_gamma;
@@ -70,7 +70,7 @@ void
 png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
 {
    png_debug1(1, "in %s storage function\n", "hIST");
-   if (info_ptr == NULL)
+   if (png_ptr == NULL || info_ptr == NULL)
       return;
 
    info_ptr->hist = hist;
@@ -84,8 +84,9 @@ png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
    int color_type, int interlace_type, int compression_type,
    int filter_type)
 {
+   int rowbytes_per_pixel;
    png_debug1(1, "in %s storage function\n", "IHDR");
-   if (info_ptr == NULL)
+   if (png_ptr == NULL || info_ptr == NULL)
       return;
 
    info_ptr->width = width;
@@ -104,7 +105,17 @@ png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
    if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)
       info_ptr->channels++;
    info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
-   info_ptr->rowbytes = ((info_ptr->width * info_ptr->pixel_depth + 7) >> 3);
+
+   /* check for overflow */
+   rowbytes_per_pixel = (info_ptr->pixel_depth + 7) >> 3;
+   if (( width > (png_uint_32)2147483647L/rowbytes_per_pixel))
+   {
+      png_warning(png_ptr,
+         "Width too large to process image data; rowbytes will overflow.");
+      info_ptr->rowbytes = (png_size_t)0;
+   }
+   else
+      info_ptr->rowbytes = (info_ptr->width * info_ptr->pixel_depth + 7) >> 3;
 }
 
 #if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
@@ -113,7 +124,7 @@ png_set_oFFs(png_structp png_ptr, png_infop info_ptr,
    png_uint_32 offset_x, png_uint_32 offset_y, int unit_type)
 {
    png_debug1(1, "in %s storage function\n", "oFFs");
-   if (info_ptr == NULL)
+   if (png_ptr == NULL || info_ptr == NULL)
       return;
 
    info_ptr->x_offset = offset_x;
@@ -129,17 +140,17 @@ png_set_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)
 {
-   png_size_t length;
+   png_uint_32 length;
    int i;
 
    png_debug1(1, "in %s storage function\n", "pCAL");
-   if (info_ptr == NULL)
+   if (png_ptr == NULL || info_ptr == NULL)
       return;
 
    length = png_strlen(purpose) + 1;
    png_debug1(3, "allocating purpose for info (%d bytes)\n", length);
    info_ptr->pcal_purpose = (png_charp)png_malloc(png_ptr, length);
-   png_memcpy(info_ptr->pcal_purpose, purpose, length);
+   png_memcpy(info_ptr->pcal_purpose, purpose, (png_size_t)length);
 
    png_debug(3, "storing X0, X1, type, and nparams in info\n");
    info_ptr->pcal_X0 = X0;
@@ -150,10 +161,10 @@ png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
    length = png_strlen(units) + 1;
    png_debug1(3, "allocating units for info (%d bytes)\n", length);
    info_ptr->pcal_units = (png_charp)png_malloc(png_ptr, length);
-   png_memcpy(info_ptr->pcal_units, units, length);
+   png_memcpy(info_ptr->pcal_units, units, (png_size_t)length);
 
    info_ptr->pcal_params = (png_charpp)png_malloc(png_ptr,
-      (nparams + 1) * sizeof(png_charp));
+      (png_uint_32)((nparams + 1) * sizeof(png_charp)));
    info_ptr->pcal_params[nparams] = NULL;
 
    for (i = 0; i < nparams; i++)
@@ -161,7 +172,7 @@ png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
       length = png_strlen(params[i]) + 1;
       png_debug2(3, "allocating parameter %d for info (%d bytes)\n", i, length);
       info_ptr->pcal_params[i] = (png_charp)png_malloc(png_ptr, length);
-      png_memcpy(info_ptr->pcal_params[i], params[i], length);
+      png_memcpy(info_ptr->pcal_params[i], params[i], (png_size_t)length);
    }
 
    info_ptr->valid |= PNG_INFO_pCAL;
@@ -174,7 +185,7 @@ png_set_pHYs(png_structp png_ptr, png_infop info_ptr,
    png_uint_32 res_x, png_uint_32 res_y, int unit_type)
 {
    png_debug1(1, "in %s storage function\n", "pHYs");
-   if (info_ptr == NULL)
+   if (png_ptr == NULL || info_ptr == NULL)
       return;
 
    info_ptr->x_pixels_per_unit = res_x;
@@ -189,7 +200,7 @@ png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
    png_colorp palette, int num_palette)
 {
    png_debug1(1, "in %s storage function\n", "PLTE");
-   if (info_ptr == NULL)
+   if (png_ptr == NULL || info_ptr == NULL)
       return;
 
    info_ptr->palette = palette;
@@ -203,7 +214,7 @@ png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
    png_color_8p sig_bit)
 {
    png_debug1(1, "in %s storage function\n", "sBIT");
-   if (info_ptr == NULL)
+   if (png_ptr == NULL || info_ptr == NULL)
       return;
 
    png_memcpy(&(info_ptr->sig_bit), sig_bit, sizeof (png_color_8));
@@ -213,18 +224,18 @@ png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
 
 #if defined(PNG_READ_sRGB_SUPPORTED) || defined(PNG_WRITE_sRGB_SUPPORTED)
 void
-png_set_sRGB(png_structp png_ptr, png_infop info_ptr, png_byte intent)
+png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int intent)
 {
    png_debug1(1, "in %s storage function\n", "sRGB");
-   if (info_ptr == NULL)
+   if (png_ptr == NULL || info_ptr == NULL)
       return;
 
-   info_ptr->srgb_intent = intent;
+   info_ptr->srgb_intent = (png_byte)intent;
    info_ptr->valid |= PNG_INFO_sRGB;
 }
 void
 png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
-   png_byte intent)
+   int intent)
 {
 #if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED)
    float file_gamma;
@@ -233,7 +244,7 @@ png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
    float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
 #endif
    png_debug1(1, "in %s storage function\n", "sRGB_gAMA_and_cHRM");
-   if (info_ptr == NULL)
+   if (png_ptr == NULL || info_ptr == NULL)
       return;
 
    png_set_sRGB(png_ptr, info_ptr, intent);
@@ -269,9 +280,9 @@ png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
    int i;
 
    png_debug1(1, "in %s storage function\n", (png_ptr->chunk_name[0] == '\0' ?
-      "text" : png_ptr->chunk_name));
+      "text" : (png_const_charp)png_ptr->chunk_name));
 
-   if (info_ptr == NULL || num_text == 0)
+   if (png_ptr == NULL || info_ptr == NULL || num_text == 0)
       return;
 
    /* Make sure we have enough space in the "text" array in info_struct
@@ -288,8 +299,9 @@ png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
          info_ptr->max_text = info_ptr->num_text + num_text + 8;
          old_text = info_ptr->text;
          info_ptr->text = (png_textp)png_malloc(png_ptr,
-            info_ptr->max_text * sizeof (png_text));
-         png_memcpy(info_ptr->text, old_text, old_max * sizeof(png_text));
+            (png_uint_32)(info_ptr->max_text * sizeof (png_text)));
+         png_memcpy(info_ptr->text, old_text, (png_size_t)(old_max *
+            sizeof(png_text)));
          png_free(png_ptr, old_text);
       }
       else
@@ -297,7 +309,7 @@ png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
          info_ptr->max_text = num_text + 8;
          info_ptr->num_text = 0;
          info_ptr->text = (png_textp)png_malloc(png_ptr,
-            info_ptr->max_text * sizeof (png_text));
+            (png_uint_32)(info_ptr->max_text * sizeof (png_text)));
       }
       png_debug1(3, "allocated %d entries for info_ptr->text\n",
          info_ptr->max_text);
@@ -308,7 +320,7 @@ png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
       png_textp textp = &(info_ptr->text[info_ptr->num_text]);
 
       if (text_ptr[i].text == NULL)
-         text_ptr[i].text = "";
+         text_ptr[i].text = (png_charp)"";
 
       if (text_ptr[i].text[0] == '\0')
       {
@@ -333,7 +345,7 @@ void
 png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_timep mod_time)
 {
    png_debug1(1, "in %s storage function\n", "tIME");
-   if (info_ptr == NULL)
+   if (png_ptr == NULL || info_ptr == NULL)
       return;
 
    png_memcpy(&(info_ptr->mod_time), mod_time, sizeof (png_time));
@@ -347,7 +359,7 @@ png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
    png_bytep trans, int num_trans, png_color_16p trans_values)
 {
    png_debug1(1, "in %s storage function\n", "tRNS");
-   if (info_ptr == NULL)
+   if (png_ptr == NULL || info_ptr == NULL)
       return;
 
    if (trans != NULL)

pngtest.c

@@ -1,12 +1,12 @@
 
 /* pngtest.c - a simple test program to test libpng
  *
- * libpng 0.97
+ * libpng 1.0.1c
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * January 7, 1998
+ * May 9, 1998
  *
  * This program reads in a PNG image, writes it out again, and then
  * compares the two files.  If the files are identical, this shows that
@@ -37,6 +37,8 @@
 
 #include "png.h"
 
+int test_one_file PNGARG((PNG_CONST char *inname, PNG_CONST char *outname));
+
 #ifdef __TURBOC__
 #include <mem.h>
 #endif
@@ -45,10 +47,139 @@
 /*  #define STDERR stderr  */
 #define STDERR stdout   /* for DOS */
 
+/* example of using row callbacks to make a simple progress meter */
+static int status_pass=1;
+static int status_dots_requested=0;
+static int status_dots=1;
+
+void
+read_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
+{
+    if(png_ptr == NULL || row_number > 0x3fffffffL) return;
+    if(status_pass != pass)
+    {
+       fprintf(stdout,"\n Pass %d: ",pass);
+       status_pass = pass;
+       status_dots = 30;
+    }
+    status_dots--;
+    if(status_dots == 0)
+    {
+       fprintf(stdout, "\n         ");
+       status_dots=30;
+    }
+    fprintf(stdout, "r");
+}
+
+void
+write_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
+{
+    if(png_ptr == NULL || row_number > 0x3fffffffL || pass > 7) return;
+    fprintf(stdout, "w");
+}
+
+
+#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+/* example of using user transform callback (we don't transform anything,
+   but merely count the zero samples) */
+
+static png_uint_32 zero_samples;
+
+void
+count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
+{
+   png_bytep dp = data;
+   if(png_ptr == NULL)return; 
+
+   /* contents of row_info:
+    *  png_uint_32 width      width of row
+    *  png_uint_32 rowbytes   number of bytes in row
+    *  png_byte color_type    color type of pixels
+    *  png_byte bit_depth     bit depth of samples
+    *  png_byte channels      number of channels (1-4)
+    *  png_byte pixel_depth   bits per pixel (depth*channels)
+    */
+
+    /* counts the number of zero samples (or zero pixels if color_type is 3 */
+
+    if(row_info->color_type == 0 || row_info->color_type == 3)
+    {
+       int pos=0;
+       png_uint_32 n, nstop;
+       for (n=0, nstop=row_info->width; n<nstop; n++)
+       {
+          if(row_info->bit_depth == 1)
+          {
+             if(((*dp << pos++ )& 0x80) == 0) zero_samples++;
+             if(pos == 8)
+             {
+                pos = 0;
+                dp++;
+             }
+          }
+          if(row_info->bit_depth == 2)
+          {
+             if(((*dp << (pos+=2))& 0xc0) == 0) zero_samples++;
+             if(pos == 8)
+             {
+                pos = 0;
+                dp++;
+             }
+          }
+          if(row_info->bit_depth == 4)
+          {
+             if(((*dp << (pos+=4))& 0xf0) == 0) zero_samples++;
+             if(pos == 8)
+             {
+                pos = 0;
+                dp++;
+             }
+          }
+          if(row_info->bit_depth == 8)
+             if(*dp++ == 0) zero_samples++;
+          if(row_info->bit_depth == 16)
+          {
+             if((*dp | *(dp+1)) == 0) zero_samples++;
+             dp+=2;
+          }
+       }
+    }
+    else /* other color types */
+    {
+       png_uint_32 n, nstop;
+       int channel;
+       int color_channels = row_info->channels;
+       if(row_info->color_type > 3)color_channels--;
+
+       for (n=0, nstop=row_info->width; n<nstop; n++)
+       {
+          for (channel = 0; channel < color_channels; channel++)
+          {
+             if(row_info->bit_depth == 8)
+                if(*dp++ == 0) zero_samples++;
+             if(row_info->bit_depth == 16)
+             {
+                if((*dp | *(dp+1)) == 0) zero_samples++;
+                dp+=2;
+             }
+          }
+          if(row_info->color_type > 3)
+          {
+             dp++;
+             if(row_info->bit_depth == 16)dp++;
+          }
+       }
+    }
+}
+#endif /* PNG_WRITE_USER_TRANSFORM_SUPPORTED */
+
+static int verbose = 0;
+static int wrote_question = 0;
+
+#if defined(PNG_NO_STDIO)
 /* START of code to validate stdio-free compilation */
 /* These copies of the default read/write functions come from pngrio.c and */
 /* pngwio.c.  They allow "don't include stdio" testing of the library. */
-#if defined(PNG_NO_STDIO)
 /* This is the function which 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
@@ -118,7 +249,7 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
       png_error(png_ptr, "read Error");
    }
 }
-#endif
+#endif /* USE_FAR_KEYWORD */
 
 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
 static void
@@ -196,7 +327,7 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
    }
 }
 
-#endif
+#endif /* USE_FAR_KEYWORD */
 
 /* 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
@@ -224,13 +355,115 @@ png_default_error(png_structp png_ptr, png_const_charp message)
    /* We can return because png_error calls the default handler which is
     * actually ok in this case. */
 }
-#endif
+#endif /* PNG_NO_STDIO */
 /* END of code to validate stdio-free compilation */
 
-/* Test one file */
-int test(PNG_CONST char *inname, PNG_CONST char *outname)
+/* START of code to validate memory allocation and deallocation */
+#ifdef PNGTEST_MEMORY_DEBUG
+/* Borland DOS special memory handler */
+#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
+ERROR - memory debugging is not supported on this platform
+#else
+
+/* Allocate memory.  For reasonable files, size should never exceed
+   64K.  However, zlib may allocate more then 64K if you don't tell
+   it not to.  See zconf.h and png.h for more information.  zlib does
+   need to allocate exactly 64K, so whatever you call here must
+   have the ability to do that.
+
+   This piece of code can be compiled to validate max 64K allocations
+   by setting MAXSEG_64K in zlib zconf.h *or* PNG_MAX_MALLOC_64K. */
+typedef struct memory_information {
+   png_uint_32                    size;
+   png_voidp                      pointer;
+   struct memory_information FAR *next;
+} memory_information;
+typedef memory_information FAR *memory_infop;
+
+static memory_infop pinformation = NULL;
+static int current_allocation = 0;
+static int maximum_allocation = 0;
+
+extern PNG_EXPORT(png_voidp,png_debug_malloc) PNGARG((png_structp png_ptr,
+   png_uint_32 size));
+extern PNG_EXPORT(void,png_debug_free) PNGARG((png_structp png_ptr,
+   png_voidp ptr));
+
+png_voidp
+png_malloc(png_structp png_ptr, png_uint_32 size) {
+   if (png_ptr == NULL) {
+      fprintf(STDERR, "NULL pointer to memory allocator\n");
+      return (NULL);
+   }
+   if (size == 0)
+      return (png_voidp)(NULL);
+
+   /* This calls the library allocator twice, once to get the requested
+      buffer and once to get a new free list entry. */
+   {
+      memory_infop pinfo = png_debug_malloc(png_ptr, sizeof *pinfo);
+      pinfo->size = size;
+      current_allocation += size;
+      if (current_allocation > maximum_allocation)
+         maximum_allocation = current_allocation;
+      pinfo->pointer = png_debug_malloc(png_ptr, size);
+      pinfo->next = pinformation;
+      pinformation = pinfo;
+      /* Make sure the caller isn't assuming zeroed memory. */
+      png_memset(pinfo->pointer, 0xdd, pinfo->size);
+      return (png_voidp)(pinfo->pointer);
+   }
+}
+
+/* Free a pointer.  It is removed from the list at the same time. */
+void
+png_free(png_structp png_ptr, png_voidp ptr)
 {
-   FILE *fpin, *fpout;
+   if (png_ptr == NULL)
+      fprintf(STDERR, "NULL pointer to memory allocator\n");
+   if (ptr == 0) {
+#if 0 /* This happens all the time. */
+      fprintf(STDERR, "WARNING: freeing NULL pointer\n");
+#endif
+      return;
+   }
+
+   /* Unlink the element from the list. */
+   {
+      memory_infop FAR *ppinfo = &pinformation;
+      for (;;) {
+         memory_infop pinfo = *ppinfo;
+         if (pinfo->pointer == ptr) {
+            *ppinfo = pinfo->next;
+            current_allocation -= pinfo->size;
+            if (current_allocation < 0)
+               fprintf(STDERR, "Duplicate free of memory\n");
+            /* We must free the list element too, but first kill
+               the memory which is to be freed. */
+            memset(ptr, 0x55, pinfo->size);
+            png_debug_free(png_ptr, pinfo);
+            break;
+         }
+         if (pinfo->next == NULL) {
+            fprintf(STDERR, "Pointer %x not found\n", ptr);
+            break;
+         }
+         ppinfo = &pinfo->next;
+      }
+   }
+
+   /* Finally free the data. */
+   png_debug_free(png_ptr, ptr);
+}
+#endif /* Not Borland DOS special memory handler */
+#endif
+/* END of code to test memory allocation/deallocation */
+
+/* Test one file */
+int
+test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
+{
+   static FILE *fpin, *fpout;  /* "static" prevents setjmp corruption */
    png_structp read_ptr, write_ptr;
    png_infop read_info_ptr, write_info_ptr, end_info_ptr;
    png_bytep row_buf;
@@ -249,30 +482,32 @@ int test(PNG_CONST char *inname, PNG_CONST char *outname)
    if ((fpin = fopen(inname, "rb")) == NULL)
    {
       fprintf(STDERR, "Could not find input file %s\n", inname);
-      return 1;
+      return (1);
    }
 
    if ((fpout = fopen(outname, "wb")) == NULL)
    {
       fprintf(STDERR, "Could not open output file %s\n", outname);
       fclose(fpin);
-      return 1;
+      return (1);
    }
 
    png_debug(0, "Allocating read and write structures\n");
    read_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, (png_voidp)NULL,
       (png_error_ptr)NULL, (png_error_ptr)NULL);
 #if defined(PNG_NO_STDIO)
-   png_set_error_fn(read_ptr, (png_voidp)inname, png_default_error, png_default_warning);
+   png_set_error_fn(read_ptr, (png_voidp)inname, png_default_error,
+       png_default_warning);
 #endif
    write_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, (png_voidp)NULL,
       (png_error_ptr)NULL, (png_error_ptr)NULL);
 #if defined(PNG_NO_STDIO)
-   png_set_error_fn(write_ptr, (png_voidp)inname, png_default_error, png_default_warning);
+   png_set_error_fn(write_ptr, (png_voidp)inname, png_default_error,
+       png_default_warning);
 #endif
    png_debug(0, "Allocating read_info, write_info and end_info structures\n");
    read_info_ptr = png_create_info_struct(read_ptr);
-   write_info_ptr = png_create_info_struct(read_ptr);
+   write_info_ptr = png_create_info_struct(write_ptr);
    end_info_ptr = png_create_info_struct(read_ptr);
 
    png_debug(0, "Setting jmpbuf for read struct\n");
@@ -287,7 +522,7 @@ int test(PNG_CONST char *inname, PNG_CONST char *outname)
       png_destroy_write_struct(&write_ptr, &write_info_ptr);
       fclose(fpin);
       fclose(fpout);
-      return 1;
+      return (1);
    }
 
    png_debug(0, "Setting jmpbuf for write struct\n");
@@ -303,7 +538,7 @@ int test(PNG_CONST char *inname, PNG_CONST char *outname)
       png_destroy_write_struct(&write_ptr, &write_info_ptr);
       fclose(fpin);
       fclose(fpout);
-      return 1;
+      return (1);
    }
 
 #ifdef USE_FAR_KEYWORD
@@ -322,6 +557,21 @@ int test(PNG_CONST char *inname, PNG_CONST char *outname)
       NULL);
 #endif
 #endif
+   if(status_dots_requested == 1)
+   {
+      png_set_write_status_fn(write_ptr, write_row_callback);
+      png_set_read_status_fn(read_ptr, read_row_callback);
+   }
+   else
+   {
+      png_set_write_status_fn(write_ptr, NULL);
+      png_set_read_status_fn(read_ptr, NULL);
+   }
+
+#  if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+     zero_samples=0;
+     png_set_write_user_transform_fn(write_ptr, count_zero_samples);
+#  endif
 
    png_debug(0, "Reading info struct\n");
    png_read_info(read_ptr, read_info_ptr);
@@ -334,7 +584,11 @@ int test(PNG_CONST char *inname, PNG_CONST char *outname)
           &color_type, &interlace_type, &compression_type, &filter_type))
       {
          png_set_IHDR(write_ptr, write_info_ptr, width, height, bit_depth,
+#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
             color_type, interlace_type, compression_type, filter_type);
+#else
+            color_type, PNG_INTERLACE_NONE, compression_type, filter_type);
+#endif
       }
    }
 #if defined(PNG_READ_bKGD_SUPPORTED) && defined(PNG_WRITE_bKGD_SUPPORTED)
@@ -371,7 +625,7 @@ int test(PNG_CONST char *inname, PNG_CONST char *outname)
 #endif
 #if defined(PNG_READ_sRGB_SUPPORTED) && defined(PNG_WRITE_sRGB_SUPPORTED)
    {
-      png_byte intent;
+      int intent;
 
       if (png_get_sRGB(read_ptr, read_info_ptr, &intent))
       {
@@ -486,6 +740,7 @@ int test(PNG_CONST char *inname, PNG_CONST char *outname)
    png_debug(0, "\nWriting info struct\n");
    png_write_info(write_ptr, write_info_ptr);
 
+   png_debug(0, "\nAllocating row buffer \n");
    row_buf = (png_bytep)png_malloc(read_ptr, 
       png_get_rowbytes(read_ptr, read_info_ptr));
    if (row_buf == NULL)
@@ -495,14 +750,16 @@ int test(PNG_CONST char *inname, PNG_CONST char *outname)
       png_destroy_write_struct(&write_ptr, &write_info_ptr);
       fclose(fpin);
       fclose(fpout);
-      return 1;
+      return (1);
    }
+   png_debug(0, "Writing row data\n");
 
    num_pass = png_set_interlace_handling(read_ptr);
    png_set_interlace_handling(write_ptr);
 
    for (pass = 0; pass < num_pass; pass++)
    {
+      png_debug1(0, "Writing row data for pass %d\n",pass);
       for (y = 0; y < height; y++)
       {
          png_read_rows(read_ptr, (png_bytepp)&row_buf, (png_bytepp)NULL, 1);
@@ -513,31 +770,41 @@ int test(PNG_CONST char *inname, PNG_CONST char *outname)
    png_debug(0, "Reading and writing end_info data\n");
    png_read_end(read_ptr, end_info_ptr);
    png_write_end(write_ptr, end_info_ptr);
+ 
+#ifdef PNG_EASY_ACCESS_SUPPORTED
+   if(verbose)
+   {
+      png_uint_32 iwidth, iheight;
+      iwidth = png_get_image_width(write_ptr, write_info_ptr);
+      iheight = png_get_image_height(write_ptr, write_info_ptr);
+      fprintf(STDERR, "Image width = %lu, height = %lu\n",
+         iwidth, iheight);
+   }
+#endif
 
    png_debug(0, "Destroying data structs\n");
+   png_free(read_ptr, row_buf);
    png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
    png_destroy_write_struct(&write_ptr, &write_info_ptr);
 
    fclose(fpin);
    fclose(fpout);
 
-   png_free(read_ptr, row_buf);
-
    png_debug(0, "Opening files for comparison\n");
    if ((fpin = fopen(inname, "rb")) == NULL)
    {
       fprintf(STDERR, "Could not find file %s\n", inname);
-      return 1;
+      return (1);
    }
 
    if ((fpout = fopen(outname, "rb")) == NULL)
    {
       fprintf(STDERR, "Could not find file %s\n", outname);
       fclose(fpin);
-      return 1;
+      return (1);
    }
 
-   while (1)
+   for(;;)
    {
       png_size_t num_in, num_out;
 
@@ -548,9 +815,20 @@ int test(PNG_CONST char *inname, PNG_CONST char *outname)
       {
          fprintf(STDERR, "Files %s and %s are of a different size\n",
                  inname, outname);
+         if(wrote_question == 0)
+         {
+            fprintf(STDERR,
+              "   Was %s written with the same chunk size (8k),",inname);
+            fprintf(STDERR,
+              " filtering\n   heuristic (libpng default), compression");
+            fprintf(STDERR,
+              " level (zlib default)\n   and zlib version (%s)?\n\n",
+              ZLIB_VERSION);
+            wrote_question=1;
+         }
          fclose(fpin);
          fclose(fpout);
-         return 1;
+         return (0);
       }
 
       if (!num_in)
@@ -559,25 +837,36 @@ int test(PNG_CONST char *inname, PNG_CONST char *outname)
       if (png_memcmp(inbuf, outbuf, num_in))
       {
          fprintf(STDERR, "Files %s and %s are different\n", inname, outname);
+         if(wrote_question == 0)
+         {
+            fprintf(STDERR,
+              "   Was %s written with the same chunk size (8k),",inname);
+            fprintf(STDERR,
+              " filtering\n   heuristic (libpng default), compression");
+            fprintf(STDERR,
+              " level (zlib default)\n   and zlib version (%s)?\n\n",
+              ZLIB_VERSION);
+            wrote_question=1;
+         }
          fclose(fpin);
          fclose(fpout);
-         return 1;
+         return (0);
       }
    }
 
    fclose(fpin);
    fclose(fpout);
 
-   return 0;
+   return (0);
 }
 
 /* input and output filenames */
 #ifdef RISCOS
-PNG_CONST char *inname = "pngtest_png";
-PNG_CONST char *outname = "pngout_png";
+PNG_CONST char *inname = "pngtest/png";
+PNG_CONST char *outname = "pngout/png";
 #else
-PNG_CONST char *inname = "pngtest.png";
-PNG_CONST char *outname = "pngout.png";
+static PNG_CONST char *inname = "pngtest.png";
+static PNG_CONST char *outname = "pngout.png";
 #endif
 
 int
@@ -587,6 +876,19 @@ main(int argc, char *argv[])
    int ierror = 0;
 
    fprintf(STDERR, "Testing libpng version %s\n", PNG_LIBPNG_VER_STRING);
+   fprintf(STDERR, "   with zlib   version %s\n", ZLIB_VERSION);
+
+   /* Do some consistency checking on the memory allocation settings, I'm
+      not sure this matters, but it is nice to know, the first of these
+      tests should be impossible because of the way the macros are set
+      in pngconf.h */
+#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
+      fprintf(STDERR, " NOTE: Zlib compiled for max 64k, libpng not\n");
+#endif
+   /* I think the following can happen. */
+#if !defined(MAXSEG_64K) && defined(PNG_MAX_MALLOC_64K)
+      fprintf(STDERR, " NOTE: libpng compiled for max 64k, zlib not\n");
+#endif
 
    if (strcmp(png_libpng_ver, PNG_LIBPNG_VER_STRING))
    {
@@ -599,41 +901,142 @@ main(int argc, char *argv[])
 
    if (argc > 1)
    {
-   if (strcmp(argv[1], "-m") == 0)
-      multiple = 1;
-   else
-      inname = argv[1];
+      if (strcmp(argv[1], "-m") == 0)
+      {
+         multiple = 1;
+         status_dots_requested = 0;
+      }
+      else if (strcmp(argv[1], "-mv") == 0 ||
+               strcmp(argv[1], "-vm") == 0 )
+      {
+         multiple = 1;
+         verbose = 1;
+         status_dots_requested = 1;
+      }
+      else if (strcmp(argv[1], "-v") == 0)
+      {
+         verbose = 1;
+         status_dots_requested = 1;
+         inname = argv[2];
+      }
+      else
+      {
+         inname = argv[1];
+         status_dots_requested = 0;
+      }
    }
 
-   if (!multiple && argc == 3)
-     outname = argv[2];
+   if (!multiple && argc == 3+verbose)
+     outname = argv[2+verbose];
 
-   if (!multiple && argc > 3 || multiple && argc < 2)
+   if ((!multiple && argc > 3+verbose) || (multiple && argc < 2))
    {
-     fprintf(STDERR, "usage: %s [infile.png] [outfile.png]\n\t%s -m {infile.png}\n",
+     fprintf(STDERR,
+       "usage: %s [infile.png] [outfile.png]\n\t%s -m {infile.png}\n",
         argv[0], argv[0]);
-     fprintf(STDERR, "  reads/writes one PNG file (without -m) or multiple files (-m)\n");
-     fprintf(STDERR, "  with -m %s is used as a temporary file\n", outname);
+     fprintf(STDERR,
+       "  reads/writes one PNG file (without -m) or multiple files (-m)\n");
+     fprintf(STDERR,
+       "  with -m %s is used as a temporary file\n", outname);
      exit(1);
    }
 
    if (multiple)
    {
       int i;
+#ifdef PNGTEST_MEMORY_DEBUG
+      int allocation_now = current_allocation;
+#endif
       for (i=2; i<argc; ++i)
-         {
-         fprintf(STDERR, "Testing %s:\n",argv[i]);
-         ierror += test(argv[i], outname);
+      {
+         int kerror;
+         fprintf(STDERR, "Testing %s:",argv[i]);
+         kerror = test_one_file(argv[i], outname);
+         if (kerror == 0) 
+#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+            fprintf(STDERR, " PASS (%lu zero samples)\n",zero_samples);
+#else
+            fprintf(STDERR, " PASS\n");
+#endif
+         else {
+            fprintf(STDERR, " FAIL\n");
+            ierror += kerror;
+            }
+#ifdef PNGTEST_MEMORY_DEBUG
+         if (allocation_now != current_allocation)
+            fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n",
+               current_allocation-allocation_now);
+         if (current_allocation != 0) {
+            memory_infop pinfo = pinformation;
+
+            fprintf(STDERR, "MEMORY ERROR: %d bytes still allocated\n",
+               current_allocation);
+            while (pinfo != NULL) {
+               fprintf(STDERR, " %d bytes at %x\n", pinfo->size, pinfo->pointer);
+               pinfo = pinfo->next;
+               }
          }
+#endif
+      }
+#ifdef PNGTEST_MEMORY_DEBUG
+         fprintf(STDERR, "Maximum memory allocation: %d bytes\n",
+            maximum_allocation);
+#endif
    }
    else
    {
-      ierror += test(inname, outname);
+      int i;
+      for (i=0; i<3; ++i) {
+         int kerror;
+#ifdef PNGTEST_MEMORY_DEBUG
+         int allocation_now = current_allocation;
+#endif
+         if (i == 1) status_dots_requested = 1;
+         else if(verbose == 0)status_dots_requested = 0;
+         if (i == 0 || verbose == 1 || ierror != 0)
+            fprintf(STDERR, "Testing %s:",inname);
+         kerror = test_one_file(inname, outname);
+         if(kerror == 0)
+         {
+            if(verbose == 1 || i == 2)
+#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+                fprintf(STDERR, " PASS (%lu zero samples)\n",zero_samples);
+#else
+                fprintf(STDERR, " PASS\n");
+#endif
+         }
+         else
+         {
+            if(verbose == 0 && i != 2)
+               fprintf(STDERR, "Testing %s:",inname);
+            fprintf(STDERR, " FAIL\n");
+            ierror += kerror;
+         }
+#ifdef PNGTEST_MEMORY_DEBUG
+         if (allocation_now != current_allocation)
+             fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n",
+               current_allocation-allocation_now);
+         if (current_allocation != 0) {
+             memory_infop pinfo = pinformation;
+   
+             fprintf(STDERR, "MEMORY ERROR: %d bytes still allocated\n",
+                current_allocation);
+             while (pinfo != NULL) {
+                fprintf(STDERR, " %d bytes at %x\n", pinfo->size, pinfo->pointer);
+                pinfo = pinfo->next;
+             }
+          }
+#endif
+       }
+#ifdef PNGTEST_MEMORY_DEBUG
+       fprintf(STDERR, "Maximum memory allocation: %d bytes\n",
+          maximum_allocation);
+#endif
    }
 
    if (ierror == 0)
       fprintf(STDERR, "libpng passes test\n");
    else
       fprintf(STDERR, "libpng FAILS test\n");
-   return ierror != 0;
+   return (int)(ierror != 0);
 }

pngtrans.c

@@ -1,12 +1,12 @@
 
 /* pngtrans.c - transforms the data in a row (used by both readers and writers)
  *
- * libpng 0.97
+ * 1.0.1c
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * January 7, 1998
+ * May 9, 1998
  */
 
 #define PNG_INTERNAL
@@ -68,7 +68,8 @@ png_set_shift(png_structp png_ptr, png_color_8p true_bits)
 }
 #endif
 
-#if defined(PNG_READ_INTERLACING_SUPPORTED) || defined(PNG_WRITE_INTERLACING_SUPPORTED)
+#if defined(PNG_READ_INTERLACING_SUPPORTED) || \
+    defined(PNG_WRITE_INTERLACING_SUPPORTED)
 int
 png_set_interlace_handling(png_structp png_ptr)
 {
@@ -76,10 +77,10 @@ png_set_interlace_handling(png_structp png_ptr)
    if (png_ptr->interlaced)
    {
       png_ptr->transformations |= PNG_INTERLACE;
-      return 7;
+      return (7);
    }
 
-   return 1;
+   return (1);
 }
 #endif
 
@@ -99,12 +100,6 @@ png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc)
       png_ptr->flags |= PNG_FLAG_FILLER_AFTER;
    else
       png_ptr->flags &= ~PNG_FLAG_FILLER_AFTER;
-
-   /* This should probably go in the "do_filler" routine */
-   if (png_ptr->color_type == PNG_COLOR_TYPE_RGB && png_ptr->bit_depth == 8)
-   {
-      png_ptr->usr_channels = 4;
-   }
 }
 #endif
 
@@ -118,6 +113,16 @@ png_set_swap_alpha(png_structp png_ptr)
 }
 #endif
 
+#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
+    defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
+void
+png_set_invert_alpha(png_structp png_ptr)
+{
+   png_debug(1, "in png_set_invert_alpha\n");
+   png_ptr->transformations |= PNG_INVERT_ALPHA;
+}
+#endif
+
 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
 void
 png_set_invert_mono(png_structp png_ptr)
@@ -137,12 +142,13 @@ png_do_invert(png_row_infop row_info, png_bytep row)
 #endif
        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++ = (png_byte)(~(*rp));
       }
    }
 }
@@ -160,15 +166,13 @@ png_do_swap(png_row_infop row_info, png_bytep row)
 #endif
        row_info->bit_depth == 16)
    {
-      png_bytep rp;
-      png_byte t;
+      png_bytep rp = row;
       png_uint_32 i;
+      png_uint_32 istop= row_info->width * row_info->channels;
 
-      for (i = 0, rp = row;
-         i < row_info->width * row_info->channels;
-         i++, rp += 2)
+      for (i = 0; i < istop; i++, rp += 2)
       {
-         t = *rp;
+         png_byte t = *rp;
          *rp = *(rp + 1);
          *(rp + 1) = t;
       }
@@ -289,7 +293,7 @@ png_do_packswap(png_row_infop row_info, png_bytep row)
    png_debug(1, "in png_do_packswap\n");
    if (
 #if defined(PNG_USELESS_TESTS_SUPPORTED)
-       row != NULL && row_info != NULL
+       row != NULL && row_info != NULL &&
 #endif
        row_info->bit_depth < 8)
    {
@@ -327,6 +331,11 @@ 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)
@@ -334,10 +343,8 @@ 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;
-               png_uint_32 i;
-
-               for (i = 1, sp = row + 4, dp = row + 3; i < row_info->width; i++)
+               dp+=3; sp+=4;
+               for (i = 1; i < row_width; i++)
                {
                   *dp++ = *sp++;
                   *dp++ = *sp++;
@@ -348,10 +355,7 @@ 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;
-               png_uint_32 i;
-
-               for (i = 0, sp = row, dp = row; i < row_info->width; i++)
+               for (i = 0; i < row_width; i++)
                {
                   sp++;
                   *dp++ = *sp++;
@@ -360,17 +364,15 @@ 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):
                   png_memcpy(dp, sp, 6);
@@ -388,17 +390,15 @@ 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):
                   png_memcpy(dp, sp, 6);
                   sp += 8;
                   dp += 6;
                   */
+                  sp+=2;
                   *dp++ = *sp++;
                   *dp++ = *sp++;
                   *dp++ = *sp++;
@@ -408,9 +408,10 @@ 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 ||
@@ -423,10 +424,7 @@ 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;
-               png_uint_32 i;
-
-               for (i = 1, sp = row + 2, dp = row + 1; i < row_info->width; i++)
+               for (i = 0; i < row_width; i++)
                {
                   *dp++ = *sp++;
                   sp++;
@@ -435,27 +433,22 @@ 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;
-               png_uint_32 i;
-
-               for (i = 0, sp = row, dp = row; i < row_info->width; i++)
+               for (i = 0; i < row_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++;
@@ -464,11 +457,8 @@ 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++;
@@ -476,9 +466,10 @@ 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;
       }
    }
 }
@@ -496,17 +487,17 @@ 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;
             }
@@ -514,12 +505,11 @@ 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;
             }
@@ -530,33 +520,31 @@ 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;
-               save[1] = *(rp + 1);
+               png_byte save = *rp;
                *rp = *(rp + 4);
+               *(rp + 4) = save;
+               save = *(rp + 1);
                *(rp + 1) = *(rp + 5);
-               *(rp + 4) = save[0];
-               *(rp + 5) = save[1];
+               *(rp + 5) = save;
             }
          }
          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;
-               save[1] = *(rp + 1);
+               png_byte save = *rp;
                *rp = *(rp + 4);
+               *(rp + 4) = save;
+               save = *(rp + 1);
                *(rp + 1) = *(rp + 5);
-               *(rp + 4) = save[0];
-               *(rp + 5) = save[1];
+               *(rp + 5) = save;
             }
          }
       }

pngwio.c

@@ -1,12 +1,12 @@
 
 /* pngwio.c - functions for data output
  *
- * libpng 0.97
+ * libpng 1.0.1c
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * January 7, 1998
+ * May 9, 1998
  *
  * This file provides a location for all output.  Users which need
  * special handling are expected to write functions which have the same
@@ -180,7 +180,7 @@ png_set_write_fn(png_structp png_ptr, png_voidp io_ptr,
 
 #if defined(USE_FAR_KEYWORD) 
 #if defined(_MSC_VER)   
-void *far_to_near(png_structp png_ptr,png_voidp ptr, int check)
+void *png_far_to_near(png_structp png_ptr,png_voidp ptr, int check)
 {
    void *near_ptr;   
    void FAR *far_ptr;
@@ -192,7 +192,7 @@ void *far_to_near(png_structp png_ptr,png_voidp ptr, int check)
    return(near_ptr);
 }
 #  else
-void *far_to_near(png_structp png_ptr,png_voidp ptr, int check)
+void *png_far_to_near(png_structp png_ptr,png_voidp ptr, int check)
 {
    void *near_ptr;   
    void FAR *far_ptr;

pngwrite.c

@@ -1,12 +1,12 @@
    
 /* pngwrite.c - general routines to write a PNG file
  *
- * libpng 0.97
+ * 1.0.1c
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * January 7, 1998
+ * May 9, 1998
  */
 
 /* get internal access to png.h */
@@ -34,7 +34,12 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
    /* write IHDR information. */
    png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,
       info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
-      info_ptr->filter_type, info_ptr->interlace_type);
+      info_ptr->filter_type,
+#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
+      info_ptr->interlace_type);
+#else
+      0);
+#endif
    /* the rest of these check to see if the valid field has the appropriate
       flag set, and if it does, writes the chunk. */
 #if defined(PNG_WRITE_gAMA_SUPPORTED)
@@ -43,7 +48,7 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
 #endif
 #if defined(PNG_WRITE_sRGB_SUPPORTED)
    if (info_ptr->valid & PNG_INFO_sRGB)
-      png_write_sRGB(png_ptr, info_ptr->srgb_intent);
+      png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent);
 #endif
 #if defined(PNG_WRITE_sBIT_SUPPORTED)
    if (info_ptr->valid & PNG_INFO_sBIT)
@@ -62,10 +67,23 @@ png_write_info(png_structp png_ptr, png_infop info_ptr)
          (png_uint_32)info_ptr->num_palette);
    else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
       png_error(png_ptr, "Valid palette required for paletted images\n");
+
 #if defined(PNG_WRITE_tRNS_SUPPORTED)
    if (info_ptr->valid & PNG_INFO_tRNS)
+      {
+#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
+         /* invert the alpha channel (in tRNS) */
+         if (png_ptr->transformations & PNG_INVERT_ALPHA &&
+            info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+         {
+            int j;
+            for (j=0; j<(int)info_ptr->num_trans; j++)
+               info_ptr->trans[j] = 255 - info_ptr->trans[j];
+         }
+#endif
       png_write_tRNS(png_ptr, info_ptr->trans, &(info_ptr->trans_values),
          info_ptr->num_trans, info_ptr->color_type);
+      }
 #endif
 #if defined(PNG_WRITE_bKGD_SUPPORTED)
    if (info_ptr->valid & PNG_INFO_bKGD)
@@ -200,26 +218,28 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
    png_write_IEND(png_ptr);
 }
 
-#if defined(PNG_TIME_RFC1152_SUPPORTED)
-/* Convert the supplied time into an RFC 1152 string suitable for use in
+#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
-png_convert_to_rfc1152(png_structp png_ptr, png_timep ptime)
+png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
 {
-   const char *short_months[12] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
-                                   "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
+   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, 29*sizeof(char));
+      png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29*
+         sizeof(char)));
    }
 
 #ifdef USE_FAR_KEYWORD
    {
       char near_time_buf[29];
       sprintf(near_time_buf, "%d %s %d %02d:%02d:%02d +0000",
-               ptime->day % 31, short_months[ptime->month],
+               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,
@@ -227,13 +247,13 @@ png_convert_to_rfc1152(png_structp png_ptr, png_timep ptime)
    }
 #else
    sprintf(png_ptr->time_buffer, "%d %s %d %02d:%02d:%02d +0000",
-               ptime->day % 31, short_months[ptime->month],
+               ptime->day % 32, short_months[(ptime->month - 1) % 12],
                ptime->year, ptime->hour % 24, ptime->minute % 60,
                ptime->second % 61);
 #endif
-   return png_ptr->time_buffer;
+   return ((png_charp)png_ptr->time_buffer);
 }
-#endif /* PNG_TIME_RFC1152_SUPPORTED */
+#endif /* PNG_TIME_RFC1123_SUPPORTED */
 
 #if defined(PNG_WRITE_tIME_SUPPORTED)
 void
@@ -261,7 +281,7 @@ png_convert_from_time_t(png_timep ptime, time_t ttime)
 
 /* Initialize png_ptr structure, and allocate any memory needed */
 png_structp
-png_create_write_struct(png_const_charp user_png_ver, voidp error_ptr,
+png_create_write_struct(png_const_charp user_png_ver, png_voidp error_ptr,
    png_error_ptr error_fn, png_error_ptr warn_fn)
 {
    png_structp png_ptr;
@@ -271,7 +291,7 @@ png_create_write_struct(png_const_charp user_png_ver, voidp error_ptr,
    png_debug(1, "in png_create_write_struct\n");
    if ((png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG)) == NULL)
    {
-      return (png_structp)NULL;
+      return ((png_structp)NULL);
    }
 #ifdef USE_FAR_KEYWORD
    if (setjmp(jmpbuf))
@@ -281,7 +301,7 @@ png_create_write_struct(png_const_charp user_png_ver, voidp error_ptr,
    {
       png_free(png_ptr, png_ptr->zbuf);
       png_destroy_struct(png_ptr);
-      return (png_structp)NULL;
+      return ((png_structp)NULL);
    }
 #ifdef USE_FAR_KEYWORD
    png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
@@ -302,7 +322,8 @@ png_create_write_struct(png_const_charp user_png_ver, voidp error_ptr,
 
    /* initialize zbuf - compression buffer */
    png_ptr->zbuf_size = PNG_ZBUF_SIZE;
-   png_ptr->zbuf = png_malloc(png_ptr, png_ptr->zbuf_size);
+   png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
+      (png_uint_32)png_ptr->zbuf_size);
 
    png_set_write_fn(png_ptr, NULL, NULL, NULL);
 
@@ -311,7 +332,7 @@ png_create_write_struct(png_const_charp user_png_ver, voidp error_ptr,
       1, NULL, NULL);
 #endif
 
-   return (png_ptr);
+   return ((png_structp)png_ptr);
 }
 
 
@@ -333,7 +354,8 @@ png_write_init(png_structp png_ptr)
 
    /* initialize zbuf - compression buffer */
    png_ptr->zbuf_size = PNG_ZBUF_SIZE;
-   png_ptr->zbuf = png_malloc(png_ptr, png_ptr->zbuf_size);
+   png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
+      (png_uint_32)png_ptr->zbuf_size);
    png_set_write_fn(png_ptr, NULL, NULL, NULL);
 
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
@@ -373,9 +395,13 @@ png_write_image(png_structp png_ptr, png_bytepp image)
    png_bytepp rp; /* points to current row */
 
    png_debug(1, "in png_write_image\n");
+#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
    /* intialize interlace handling.  If image is not interlaced,
       this will set pass to 1 */
    num_pass = png_set_interlace_handling(png_ptr);
+#else
+   num_pass = 1;
+#endif
    /* loop through passes */
    for (pass = 0; pass < num_pass; pass++)
    {
@@ -396,6 +422,36 @@ png_write_row(png_structp png_ptr, png_bytep row)
    /* initialize transformations and other stuff if first time */
    if (png_ptr->row_number == 0 && png_ptr->pass == 0)
    {
+   /* check for transforms that have been set but were defined out */
+#if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED)
+   if (png_ptr->transformations & PNG_INVERT_MONO)
+      png_warning(png_ptr, "PNG_WRITE_INVERT_SUPPORTED is not defined.");
+#endif
+#if !defined(PNG_WRITE_FILLER_SUPPORTED) && defined(PNG_READ_FILLER_SUPPORTED)
+   if (png_ptr->transformations & PNG_FILLER)
+      png_warning(png_ptr, "PNG_WRITE_FILLER_SUPPORTED is not defined.");
+#endif
+#if !defined(PNG_WRITE_PACKSWAP_SUPPORTED) && defined(PNG_READ_PACKSWAP_SUPPORTED)
+   if (png_ptr->transformations & PNG_PACKSWAP)
+      png_warning(png_ptr, "PNG_WRITE_PACKSWAP_SUPPORTED is not defined.");
+#endif
+#if !defined(PNG_WRITE_PACK_SUPPORTED) && defined(PNG_READ_PACK_SUPPORTED)
+   if (png_ptr->transformations & PNG_PACK)
+      png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined.");
+#endif
+#if !defined(PNG_WRITE_SHIFT_SUPPORTED) && defined(PNG_READ_SHIFT_SUPPORTED)
+   if (png_ptr->transformations & PNG_SHIFT)
+      png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined.");
+#endif
+#if !defined(PNG_WRITE_BGR_SUPPORTED) && defined(PNG_READ_BGR_SUPPORTED)
+   if (png_ptr->transformations & PNG_BGR)
+      png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined.");
+#endif
+#if !defined(PNG_WRITE_SWAP_SUPPORTED) && defined(PNG_READ_SWAP_SUPPORTED)
+   if (png_ptr->transformations & PNG_SWAP_BYTES)
+      png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined.");
+#endif
+
       png_write_start_row(png_ptr);
    }
 
@@ -465,6 +521,7 @@ png_write_row(png_structp png_ptr, png_bytep row)
    png_ptr->row_info.bit_depth = png_ptr->usr_bit_depth;
    png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth *
       png_ptr->row_info.channels);
+
    png_ptr->row_info.rowbytes = ((png_ptr->row_info.width *
       (png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3);
 
@@ -476,7 +533,8 @@ png_write_row(png_structp png_ptr, png_bytep row)
    png_debug1(3, "row_info->rowbytes = %d\n", png_ptr->row_info.rowbytes);
 
    /* Copy user's row into buffer, leaving room for filter byte. */
-   png_memcpy(png_ptr->row_buf + 1, row, png_ptr->row_info.rowbytes);
+   png_memcpy_check(png_ptr, png_ptr->row_buf + 1, row,
+      png_ptr->row_info.rowbytes);
 
 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
    /* handle interlacing */
@@ -500,6 +558,9 @@ png_write_row(png_structp png_ptr, png_bytep row)
 
    /* Find a filter if necessary, filter the row and write it out. */
    png_write_find_filter(png_ptr, &(png_ptr->row_info));
+
+   if (png_ptr->write_row_fn != NULL)
+      (*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
 }
 
 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
@@ -582,6 +643,19 @@ png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
    {
 #ifdef PNG_WRITE_tEXt_SUPPORTED
       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)
+      {
+         int i;
+         for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
+         {
+            png_free(png_ptr, info_ptr->pcal_params[i]);
+         }
+         png_free(png_ptr, info_ptr->pcal_params);
+      }
 #endif
       png_destroy_struct((png_voidp)info_ptr);
       *info_ptr_ptr = (png_infop)NULL;
@@ -617,9 +691,9 @@ png_write_destroy(png_structp png_ptr)
    png_free(png_ptr, png_ptr->up_row);
    png_free(png_ptr, png_ptr->avg_row);
    png_free(png_ptr, png_ptr->paeth_row);
-#if defined(PNG_TIME_RFC1152_SUPPORTED)
+#if defined(PNG_TIME_RFC1123_SUPPORTED)
    png_free(png_ptr, png_ptr->time_buffer);
-#endif /* PNG_TIME_RFC1152_SUPPORTED */
+#endif /* PNG_TIME_RFC1123_SUPPORTED */
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
    png_free(png_ptr, png_ptr->prev_filters);
    png_free(png_ptr, png_ptr->filter_weights);
@@ -679,7 +753,7 @@ png_set_filter(png_structp png_ptr, int method, int filters)
          if (png_ptr->do_filter & PNG_FILTER_SUB && png_ptr->sub_row == NULL)
          {
             png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
-               png_ptr->rowbytes + 1);
+              (png_ptr->rowbytes + 1));
             png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
          }
 
@@ -693,7 +767,7 @@ png_set_filter(png_structp png_ptr, int method, int filters)
             else
             {
                png_ptr->up_row = (png_bytep)png_malloc(png_ptr,
-                  png_ptr->rowbytes + 1);
+                  (png_ptr->rowbytes + 1));
                png_ptr->up_row[0] = PNG_FILTER_VALUE_UP;
             }
          }
@@ -708,7 +782,7 @@ png_set_filter(png_structp png_ptr, int method, int filters)
             else
             {
                png_ptr->avg_row = (png_bytep)png_malloc(png_ptr,
-                  png_ptr->rowbytes + 1);
+                  (png_ptr->rowbytes + 1));
                png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG;
             }
          }
@@ -723,8 +797,8 @@ png_set_filter(png_structp png_ptr, int method, int filters)
             }
             else
             {
-               png_ptr->paeth_row = (png_bytep )png_malloc(png_ptr,
-                  png_ptr->rowbytes + 1);
+               png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr,
+                  (png_ptr->rowbytes + 1));
                png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
             }
          }
@@ -780,7 +854,7 @@ png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
       if (png_ptr->prev_filters == NULL)
       {
          png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr,
-            sizeof(png_byte) * num_weights);
+            (png_uint_32)(sizeof(png_byte) * num_weights));
 
          /* To make sure that the weighting starts out fairly */
          for (i = 0; i < num_weights; i++)
@@ -791,11 +865,11 @@ png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
 
       if (png_ptr->filter_weights == NULL)
       {
-         png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr,
-            sizeof(png_uint_16) * num_weights);
+         png_ptr->filter_weights = (png_uint_16p) png_malloc(png_ptr,
+            (png_uint_32)(sizeof(png_uint_16) * num_weights));
 
-         png_ptr->inv_filter_weights = (png_uint_16p)png_malloc(png_ptr,
-            sizeof(png_uint_16) * num_weights);
+         png_ptr->inv_filter_weights = (png_uint_16p) png_malloc(png_ptr,
+            (png_uint_32)(sizeof(png_uint_16) * num_weights));
 
          for (i = 0; i < num_weights; i++)
          {
@@ -826,11 +900,11 @@ png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
     */
    if (png_ptr->filter_costs == NULL)
    {
-      png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr,
-         sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST);
+      png_ptr->filter_costs = (png_uint_16p) png_malloc(png_ptr,
+         (png_uint_32)(sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
 
-      png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr,
-         sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST);
+      png_ptr->inv_filter_costs = (png_uint_16p) png_malloc(png_ptr,
+         (png_uint_32)(sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
 
       for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
       {
@@ -907,3 +981,20 @@ png_set_compression_method(png_structp png_ptr, int method)
    png_ptr->zlib_method = method;
 }
 
+void
+png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn)
+{
+   png_ptr->write_row_fn = write_row_fn;
+}
+
+#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+void
+png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
+   write_user_transform_fn)
+{
+   png_debug(1, "in png_set_write_user_transform_fn\n");
+   png_ptr->transformations |= PNG_USER_TRANSFORM;
+   png_ptr->write_user_transform_fn = write_user_transform_fn;
+}
+#endif
+

pngwtran.c

@@ -1,12 +1,12 @@
 
 /* pngwtran.c - transforms the data in a row for PNG writers
  *
- * libpng 0.97
+ * 1.0.1c
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * January 7, 1998
+ * May 9, 1998
  */
 
 #define PNG_INTERNAL
@@ -19,11 +19,30 @@ void
 png_do_write_transformations(png_structp png_ptr)
 {
    png_debug(1, "in png_do_write_transformations\n");
+
+#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+   if (png_ptr->transformations & PNG_USER_TRANSFORM)
+      if(png_ptr->write_user_transform_fn != NULL)
+        (*(png_ptr->write_user_transform_fn)) /* user write transform function */
+          (png_ptr,                    /* png_ptr */
+           &(png_ptr->row_info),       /* row_info:     */
+             /*  png_uint_32 width;          width of row */
+             /*  png_uint_32 rowbytes;       number of bytes in row */
+             /*  png_byte color_type;        color type of pixels */
+             /*  png_byte bit_depth;         bit depth of samples */
+             /*  png_byte channels;          number of channels (1-4) */
+             /*  png_byte pixel_depth;       bits per pixel (depth*channels) */
+           png_ptr->row_buf + 1);      /* start of pixel data for row */
+#endif
 #if defined(PNG_WRITE_FILLER_SUPPORTED)
    if (png_ptr->transformations & PNG_FILLER)
       png_do_strip_filler(&(png_ptr->row_info), png_ptr->row_buf + 1,
          png_ptr->flags);
 #endif
+#if defined(PNG_WRITE_PACKSWAP_SUPPORTED)
+   if (png_ptr->transformations & PNG_PACKSWAP)
+      png_do_packswap(&(png_ptr->row_info), png_ptr->row_buf + 1);
+#endif
 #if defined(PNG_WRITE_PACK_SUPPORTED)
    if (png_ptr->transformations & PNG_PACK)
       png_do_pack(&(png_ptr->row_info), png_ptr->row_buf + 1,
@@ -38,6 +57,10 @@ png_do_write_transformations(png_structp png_ptr)
    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);
+#endif
 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
    if (png_ptr->transformations & PNG_SWAP_ALPHA)
       png_do_write_swap_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1);
@@ -74,12 +97,14 @@ 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;
@@ -103,12 +128,13 @@ 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;
 
@@ -134,12 +160,13 @@ 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;
 
@@ -191,9 +218,8 @@ 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;
@@ -219,12 +245,13 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
          channels++;
       }
 
-      /* with low row dephts, could only be grayscale, so one channel */
+      /* with low row depths, could only be grayscale, so one channel */
       if (row_info->bit_depth < 8)
       {
-         png_bytep bp;
+         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;
@@ -233,7 +260,7 @@ 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;
@@ -251,27 +278,25 @@ 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;
+            for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c])
             {
-               png_uint_16 v;
-               int j;
-
-               v = *bp;
-               *bp = 0;
-               for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c])
-               {
-                  if (j > 0)
-                     *bp |= (png_byte)((v << j) & 0xff);
-                  else
-                     *bp |= (png_byte)((v >> (-j)) & 0xff);
-               }
+               if (j > 0)
+                  *bp |= (png_byte)((v << j) & 0xff);
+               else
+                  *bp |= (png_byte)((v >> (-j)) & 0xff);
             }
          }
       }
@@ -279,28 +304,25 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
       {
          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;
+            int c = (int)(i%channels);
+            png_uint_16 value, v;
+            int j;
 
-            for (c = 0; c < channels; c++, bp += 2)
+            v = ((png_uint_16)(*bp) << 8) + *(bp + 1);
+            value = 0;
+            for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c])
             {
-               png_uint_16 value, v;
-               int j;
-
-               v = ((png_uint_16)(*bp) << 8) + *(bp + 1);
-               value = 0;
-               for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c])
-               {
-                  if (j > 0)
-                     value |= (png_uint_16)((v << j) & (png_uint_16)0xffff);
-                  else
-                     value |= (png_uint_16)((v >> (-j)) & (png_uint_16)0xffff);
-               }
-               *bp = (png_byte)(value >> 8);
-               *(bp + 1) = (png_byte)(value & 0xff);
+               if (j > 0)
+                  value |= (png_uint_16)((v << j) & (png_uint_16)0xffff);
+               else
+                  value |= (png_uint_16)((v >> (-j)) & (png_uint_16)0xffff);
             }
+            *bp++ = (png_byte)(value >> 8);
+            *bp++ = (png_byte)(value & 0xff);
          }
       }
    }
@@ -322,12 +344,11 @@ 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;
-
-            for (i = 0, sp = dp = row; i < row_info->width; i++)
+            png_uint_32 row_width = row_info->width;
+            for (i = 0, sp = dp = row; i < row_width; i++)
             {
-               save = *(sp++);
+               png_byte save = *(sp++);
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
                *(dp++) = *(sp++);
@@ -338,11 +359,12 @@ 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++);
@@ -362,12 +384,12 @@ 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;
             }
@@ -376,11 +398,12 @@ 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++);
@@ -394,3 +417,82 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
 }
 #endif
 
+#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
+void
+png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
+{
+   png_debug(1, "in png_do_write_invert_alpha\n");
+#if defined(PNG_USELESS_TESTS_SUPPORTED)
+   if (row != NULL && row_info != NULL)
+#endif
+   {
+      if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+      {
+         /* This inverts the alpha channel in RGBA */
+         if (row_info->bit_depth == 8)
+         {
+            png_bytep sp, dp;
+            png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
+            for (i = 0, sp = dp = row; i < row_width; i++)
+            {
+               *(dp++) = *(sp++);
+               *(dp++) = *(sp++);
+               *(dp++) = *(sp++);
+               *(dp++) = 255 - *(sp++);
+            }
+         }
+         /* This inverts the alpha channel in RRGGBBAA */
+         else
+         {
+            png_bytep sp, dp;
+            png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
+
+            for (i = 0, sp = dp = row; i < row_width; i++)
+            {
+               *(dp++) = *(sp++);
+               *(dp++) = *(sp++);
+               *(dp++) = *(sp++);
+               *(dp++) = *(sp++);
+               *(dp++) = *(sp++);
+               *(dp++) = *(sp++);
+               *(dp++) = 255 - *(sp++);
+               *(dp++) = 255 - *(sp++);
+            }
+         }
+      }
+      else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
+      {
+         /* This inverts the alpha channel in GA */
+         if (row_info->bit_depth == 8)
+         {
+            png_bytep sp, dp;
+            png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
+
+            for (i = 0, sp = dp = row; i < row_width; i++)
+            {
+               *(dp++) = *(sp++);
+               *(dp++) = 255 - *(sp++);
+            }
+         }
+         /* This inverts the alpha channel in GGAA */
+         else
+         {
+            png_bytep sp, dp;
+            png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
+
+            for (i = 0, sp = dp = row; i < row_width; i++)
+            {
+               *(dp++) = *(sp++);
+               *(dp++) = *(sp++);
+               *(dp++) = 255 - *(sp++);
+               *(dp++) = 255 - *(sp++);
+            }
+         }
+      }
+   }
+}
+#endif

pngwutil.c

@@ -1,12 +1,12 @@
 
 /* pngwutil.c - utilities to write a PNG file
  *
- * libpng 0.97
+ * 1.0.1c
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
  * Copyright (c) 1996, 1997 Andreas Dilger
  * Copyright (c) 1998, Glenn Randers-Pehrson
- * January 7, 1998
+ * May 9, 1998
  */
 
 #define PNG_INTERNAL
@@ -200,12 +200,16 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
       filter_type = PNG_FILTER_TYPE_BASE;
    }
 
+#ifdef PNG_WRITE_INTERLACING_SUPPORTED
    if (interlace_type != PNG_INTERLACE_NONE &&
       interlace_type != PNG_INTERLACE_ADAM7)
    {
       png_warning(png_ptr, "Invalid interlace type specified");
       interlace_type = PNG_INTERLACE_ADAM7;
    }
+#else
+   interlace_type=PNG_INTERLACE_NONE;
+#endif
 
    /* save off the relevent information */
    png_ptr->bit_depth = (png_byte)bit_depth;
@@ -336,7 +340,7 @@ png_write_gAMA(png_structp png_ptr, double file_gamma)
    png_byte buf[4];
 
    png_debug(1, "in png_write_gAMA\n");
-   /* file_gamma is saved in 1/100,000ths */
+   /* file_gamma is saved in 1/1000000ths */
    igamma = (png_uint_32)(file_gamma * 100000.0 + 0.5);
    png_save_uint_32(buf, igamma);
    png_write_chunk(png_ptr, png_gAMA, buf, (png_size_t)4);
@@ -346,15 +350,15 @@ png_write_gAMA(png_structp png_ptr, double file_gamma)
 #if defined(PNG_WRITE_sRGB_SUPPORTED)
 /* write a sRGB chunk */
 void
-png_write_sRGB(png_structp png_ptr, png_byte srgb_intent)
+png_write_sRGB(png_structp png_ptr, int srgb_intent)
 {
    png_byte buf[1];
 
    png_debug(1, "in png_write_sRGB\n");
-   if(srgb_intent > 3)
+   if(srgb_intent >= PNG_sRGB_INTENT_LAST)
          png_warning(png_ptr,
             "Invalid sRGB rendering intent specified");
-   buf[0]=srgb_intent;
+   buf[0]=(png_byte)srgb_intent;
    png_write_chunk(png_ptr, png_sRGB, buf, (png_size_t)1);
 }
 #endif
@@ -371,7 +375,7 @@ png_write_sBIT(png_structp png_ptr, png_color_8p sbit, int color_type)
    /* make sure we don't depend upon the order of PNG_COLOR_8 */
    if (color_type & PNG_COLOR_MASK_COLOR)
    {
-      int maxbits;
+      png_byte maxbits;
 
       maxbits = color_type==PNG_COLOR_TYPE_PALETTE ? 8:png_ptr->usr_bit_depth;
       if (sbit->red == 0 || sbit->red > maxbits || 
@@ -422,7 +426,7 @@ png_write_cHRM(png_structp png_ptr, double white_x, double white_y,
    png_byte buf[32];
 
    png_debug(1, "in png_write_cHRM\n");
-   /* each value is saved int 1/100,000ths */
+   /* each value is saved int 1/1000000ths */
    if (white_x < 0 || white_x > 0.8 || white_y < 0 || white_y > 0.8 ||
        white_x + white_y > 1.0)
    {
@@ -482,7 +486,7 @@ png_write_tRNS(png_structp png_ptr, png_bytep trans, png_color_16p tran,
    png_debug(1, "in png_write_tRNS\n");
    if (color_type == PNG_COLOR_TYPE_PALETTE)
    {
-      if (num_trans <= 0 || num_trans > png_ptr->num_palette)
+      if (num_trans <= 0 || num_trans > (int)png_ptr->num_palette)
       {
          png_warning(png_ptr,"Invalid number of transparent colors specified");
          return;
@@ -506,7 +510,7 @@ png_write_tRNS(png_structp png_ptr, png_bytep trans, png_color_16p tran,
    }
    else
    {
-      png_warning(png_ptr, "Can't write tRNS with and alpha channel");
+      png_warning(png_ptr, "Can't write tRNS with an alpha channel");
    }
 }
 #endif
@@ -547,13 +551,13 @@ png_write_bKGD(png_structp png_ptr, png_color_16p back, int color_type)
 #if defined(PNG_WRITE_hIST_SUPPORTED)
 /* write the histogram */
 void
-png_write_hIST(png_structp png_ptr, png_uint_16p hist, png_uint_32 num_hist)
+png_write_hIST(png_structp png_ptr, png_uint_16p hist, int num_hist)
 {
-   png_uint_32 i;
+   int i;
    png_byte buf[3];
 
    png_debug(1, "in png_write_hIST\n");
-   if (num_hist > png_ptr->num_palette)
+   if (num_hist > (int)png_ptr->num_palette)
    {
       png_debug2(3, "num_hist = %d, num_palette = %d\n", num_hist,
          png_ptr->num_palette);
@@ -561,7 +565,7 @@ png_write_hIST(png_structp png_ptr, png_uint_16p hist, png_uint_32 num_hist)
       return;
    }
 
-   png_write_chunk_start(png_ptr, png_hIST, num_hist * 2);
+   png_write_chunk_start(png_ptr, png_hIST, (png_uint_32)(num_hist * 2));
    for (i = 0; i < num_hist; i++)
    {
       png_save_uint_16(buf, hist[i]);
@@ -595,12 +599,12 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
    if (key == NULL || (key_len = png_strlen(key)) == 0)
    {
       png_chunk_warning(png_ptr, "zero length keyword");
-      return 0;
+      return ((png_size_t)0);
    }
 
    png_debug1(2, "Keyword to be checked is '%s'\n", key);
 
-   *new_key = (png_charp)png_malloc(png_ptr, key_len + 1);
+   *new_key = (png_charp)png_malloc(png_ptr, (png_uint_32)(key_len + 1));
 
    /* Replace non-printing characters with a blank and print a warning */
    for (kp = key, dp = *new_key; *kp != '\0'; kp++, dp++)
@@ -684,7 +688,7 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
       key_len = 79;
    }
 
-   return key_len;
+   return (key_len);
 }
 #endif
 
@@ -811,17 +815,18 @@ png_write_zTXt(png_structp png_ptr, png_charp key, png_charp text,
 
                old_ptr = output_ptr;
                output_ptr = (png_charpp)png_malloc(png_ptr,
-                  max_output_ptr * sizeof (png_charpp));
+                  (png_uint_32)(max_output_ptr * sizeof (png_charpp)));
                png_memcpy(output_ptr, old_ptr, old_max * sizeof (png_charp));
                png_free(png_ptr, old_ptr);
             }
             else
                output_ptr = (png_charpp)png_malloc(png_ptr,
-                  max_output_ptr * sizeof (png_charp));
+                  (png_uint_32)(max_output_ptr * sizeof (png_charp)));
          }
 
          /* save the data */
-         output_ptr[num_output_ptr] = png_malloc(png_ptr, png_ptr->zbuf_size);
+         output_ptr[num_output_ptr] = (png_charp)png_malloc(png_ptr,
+            (png_uint_32)png_ptr->zbuf_size);
          png_memcpy(output_ptr[num_output_ptr], png_ptr->zbuf,
             png_ptr->zbuf_size);
          num_output_ptr++;
@@ -864,18 +869,18 @@ png_write_zTXt(png_structp png_ptr, png_charp key, png_charp text,
                old_ptr = output_ptr;
                /* This could be optimized to realloc() */
                output_ptr = (png_charpp)png_malloc(png_ptr,
-                  max_output_ptr * sizeof (png_charpp));
+                  (png_uint_32)(max_output_ptr * sizeof (png_charpp)));
                png_memcpy(output_ptr, old_ptr, old_max * sizeof (png_charp));
                png_free(png_ptr, old_ptr);
             }
             else
                output_ptr = (png_charpp)png_malloc(png_ptr,
-                  max_output_ptr * sizeof (png_charp));
+                  (png_uint_32)(max_output_ptr * sizeof (png_charp)));
          }
 
          /* save off the data */
-         output_ptr[num_output_ptr] = png_malloc(png_ptr,
-            png_ptr->zbuf_size);
+         output_ptr[num_output_ptr] = (png_charp)png_malloc(png_ptr,
+            (png_uint_32)png_ptr->zbuf_size);
          png_memcpy(output_ptr[num_output_ptr], png_ptr->zbuf,
             png_ptr->zbuf_size);
          num_output_ptr++;
@@ -963,7 +968,8 @@ png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0,
    png_debug1(3, "pCAL units length = %d\n", units_len);
    total_len = purpose_len + units_len + 10;
 
-   params_len = (png_uint_32p)png_malloc(png_ptr, nparams*sizeof(png_uint_32));
+   params_len = (png_uint_32p)png_malloc(png_ptr, (png_uint_32)(nparams
+      *sizeof(png_uint_32)));
 
    /* Find the length of each parameter, making sure we don't count the
       null terminator for the last parameter. */
@@ -975,7 +981,7 @@ png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0,
    }
 
    png_debug1(3, "pCAL total length = %d\n", total_len);
-   png_write_chunk_start(png_ptr, png_pCAL, total_len);
+   png_write_chunk_start(png_ptr, png_pCAL, (png_uint_32)total_len);
    png_write_chunk_data(png_ptr, (png_bytep)new_purpose, purpose_len);
    png_save_int_32(buf, X0);
    png_save_int_32(buf + 4, X1);
@@ -992,6 +998,7 @@ png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0,
          (png_size_t)params_len[i]);
    }
 
+   png_free(png_ptr, params_len);
    png_write_chunk_end(png_ptr);
 }
 #endif
@@ -1057,14 +1064,14 @@ png_write_start_row(png_structp png_ptr)
                             png_ptr->usr_bit_depth + 7) >> 3) + 1);
 
    /* set up row buffer */
-   png_ptr->row_buf = (png_bytep)png_malloc(png_ptr, buf_size);
+   png_ptr->row_buf = (png_bytep)png_malloc(png_ptr, (png_uint_32)buf_size);
    png_ptr->row_buf[0] = PNG_FILTER_VALUE_NONE;
 
    /* set up filtering buffer, if using this filter */
    if (png_ptr->do_filter & PNG_FILTER_SUB)
    {
       png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
-         png_ptr->rowbytes + 1);
+         (png_ptr->rowbytes + 1));
       png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
    }
 
@@ -1072,31 +1079,32 @@ png_write_start_row(png_structp png_ptr)
    if (png_ptr->do_filter & (PNG_FILTER_AVG | PNG_FILTER_UP | PNG_FILTER_PAETH))
    {
      /* set up previous row buffer */
-      png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, buf_size);
+      png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, (png_uint_32)buf_size);
       png_memset(png_ptr->prev_row, 0, buf_size);
 
       if (png_ptr->do_filter & PNG_FILTER_UP)
       {
          png_ptr->up_row = (png_bytep )png_malloc(png_ptr,
-            png_ptr->rowbytes + 1);
+            (png_ptr->rowbytes + 1));
          png_ptr->up_row[0] = PNG_FILTER_VALUE_UP;
       }
 
       if (png_ptr->do_filter & PNG_FILTER_AVG)
       {
-         png_ptr->avg_row = (png_bytep )png_malloc(png_ptr,
-            png_ptr->rowbytes + 1);
+         png_ptr->avg_row = (png_bytep)png_malloc(png_ptr,
+            (png_ptr->rowbytes + 1));
          png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG;
       }
 
       if (png_ptr->do_filter & PNG_FILTER_PAETH)
       {
          png_ptr->paeth_row = (png_bytep )png_malloc(png_ptr,
-            png_ptr->rowbytes + 1);
+            (png_ptr->rowbytes + 1));
          png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
       }
    }
 
+#ifdef PNG_WRITE_INTERLACING_SUPPORTED
    /* if interlaced, we need to set up width and height of pass */
    if (png_ptr->interlaced)
    {
@@ -1114,6 +1122,7 @@ png_write_start_row(png_structp png_ptr)
       }
    }
    else
+#endif
    {
       png_ptr->num_rows = png_ptr->height;
       png_ptr->usr_width = png_ptr->width;
@@ -1136,6 +1145,7 @@ png_write_finish_row(png_structp png_ptr)
    if (png_ptr->row_number < png_ptr->num_rows)
       return;
 
+#ifdef PNG_WRITE_INTERLACING_SUPPORTED
    /* if interlaced, go to next pass */
    if (png_ptr->interlaced)
    {
@@ -1177,6 +1187,7 @@ png_write_finish_row(png_structp png_ptr)
          return;
       }
    }
+#endif
 
    /* if we get here, we've just written the last row, so we need
       to flush the compressor */
@@ -1230,7 +1241,7 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
    if (pass < 6)
 #endif
    {
-      /* each pixel depth is handled seperately */
+      /* each pixel depth is handled separately */
       switch (row_info->pixel_depth)
       {
          case 1:
@@ -1241,11 +1252,12 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
             int d;
             int value;
             png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
 
             dp = row;
             d = 0;
             shift = 7;
-            for (i = png_pass_start[pass]; i < row_info->width;
+            for (i = png_pass_start[pass]; i < row_width;
                i += png_pass_inc[pass])
             {
                sp = row + (png_size_t)(i >> 3);
@@ -1274,11 +1286,12 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
             int d;
             int value;
             png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
 
             dp = row;
             shift = 6;
             d = 0;
-            for (i = png_pass_start[pass]; i < row_info->width;
+            for (i = png_pass_start[pass]; i < row_width;
                i += png_pass_inc[pass])
             {
                sp = row + (png_size_t)(i >> 2);
@@ -1306,11 +1319,12 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
             int d;
             int value;
             png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
 
             dp = row;
             shift = 4;
             d = 0;
-            for (i = png_pass_start[pass]; i < row_info->width;
+            for (i = png_pass_start[pass]; i < row_width;
                i += png_pass_inc[pass])
             {
                sp = row + (png_size_t)(i >> 1);
@@ -1335,6 +1349,7 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
             png_bytep sp;
             png_bytep dp;
             png_uint_32 i;
+            png_uint_32 row_width = row_info->width;
             png_size_t pixel_bytes;
 
             /* start at the beginning */
@@ -1343,11 +1358,11 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
             pixel_bytes = (row_info->pixel_depth >> 3);
             /* loop through the row, only looking at the pixels that
                matter */
-            for (i = png_pass_start[pass]; i < row_info->width;
+            for (i = png_pass_start[pass]; i < row_width;
                i += png_pass_inc[pass])
             {
                /* find out where the original pixel is */
-               sp = row + i * pixel_bytes;
+               sp = row + (png_size_t)i * pixel_bytes;
                /* move the pixel */
                if (dp != sp)
                   png_memcpy(dp, sp, pixel_bytes);
@@ -1362,9 +1377,8 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
          png_pass_inc[pass] - 1 -
          png_pass_start[pass]) /
          png_pass_inc[pass];
-      row_info->rowbytes = ((row_info->width *
-         row_info->pixel_depth + 7) >> 3);
-
+         row_info->rowbytes = ((row_info->width *
+            row_info->pixel_depth + 7) >> 3);
    }
 }
 #endif
@@ -1373,15 +1387,20 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
  * been specified by the application, and then writes the row out with the
  * chosen filter.
  */
-#define PNG_MAXSUM (png_uint_32)(~0x0UL >> 1)
+#define PNG_MAXSUM (~((png_uint_32)0) >> 1)
 #define PNG_HISHIFT 10
-#define PNG_LOMASK (png_uint_32)0xffffL
-#define PNG_HIMASK (png_uint_32)(~PNG_LOMASK >> PNG_HISHIFT)
+#define PNG_LOMASK ((png_uint_32)0xffffL)
+#define PNG_HIMASK ((png_uint_32)(~PNG_LOMASK >> PNG_HISHIFT))
 void
 png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
 {
    png_bytep prev_row, best_row, row_buf;
    png_uint_32 mins, bpp;
+   png_byte filter_to_do = png_ptr->do_filter;
+   png_uint_32 row_bytes = row_info->rowbytes;
+#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
+   int num_p_filters = (int)png_ptr->num_prev_filters;
+#endif
 
    png_debug(1, "in png_write_find_filter\n");
    /* find out how many bytes offset each pixel is */
@@ -1395,7 +1414,7 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
     * smallest value when summing the absolute values of the distances
     * from zero using anything >= 128 as negative numbers.  This is known
     * as the "minimum sum of absolute differences" heuristic.  Other
-    * heruistics are the "weighted minumum sum of absolute differences"
+    * heuristics are the "weighted minimum sum of absolute differences"
     * (experimental and can in theory improve compression), and the "zlib
     * predictive" method (not implemented in libpng 0.95), which does test
     * compressions of lines using different filter methods, and then chooses
@@ -1403,18 +1422,19 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
     * computationally expensive).
     */
 
+
    /* We don't need to test the 'no filter' case if this is the only filter
     * that has been chosen, as it doesn't actually do anything to the data.
     */
-   if (png_ptr->do_filter & PNG_FILTER_NONE &&
-       png_ptr->do_filter != PNG_FILTER_NONE)
+   if (filter_to_do & PNG_FILTER_NONE &&
+       filter_to_do != PNG_FILTER_NONE)
    {
       png_bytep rp;
       png_uint_32 sum = 0;
-      png_size_t i;
+      png_uint_32 i;
       int v;
 
-      for (i = 0, rp = row_buf + 1; i < row_info->rowbytes; i++, rp++)
+      for (i = 0, rp = row_buf + 1; i < row_bytes; i++, rp++)
       {
          v = *rp;
          sum += (v < 128) ? v : 256 - v;
@@ -1424,17 +1444,18 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
       if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
       {
          png_uint_32 sumhi, sumlo;
+         int j;
          sumlo = sum & PNG_LOMASK;
          sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK; /* Gives us some footroom */
 
          /* Reduce the sum if we match any of the previous rows */
-         for (i = 0; i < png_ptr->num_prev_filters; i++)
+         for (j = 0; j < num_p_filters; j++)
          {
-            if (png_ptr->prev_filters[i] == PNG_FILTER_NONE)
+            if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_NONE)
             {
-               sumlo = (sumlo * png_ptr->filter_weights[i]) >>
+               sumlo = (sumlo * png_ptr->filter_weights[j]) >>
                   PNG_WEIGHT_SHIFT;
-               sumhi = (sumhi * png_ptr->filter_weights[i]) >>
+               sumhi = (sumhi * png_ptr->filter_weights[j]) >>
                   PNG_WEIGHT_SHIFT;
             }
          }
@@ -1458,31 +1479,50 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
    }
 
    /* sub filter */
-   if (png_ptr->do_filter & PNG_FILTER_SUB)
+   if (filter_to_do == PNG_FILTER_SUB)
+   /* it's the only filter so no testing is needed */
+   {
+      png_bytep rp, lp, dp;
+      png_uint_32 i;
+      for (i = 0, rp = row_buf + 1, dp = png_ptr->sub_row + 1; i < bpp;
+           i++, rp++, dp++)
+      {
+         *dp = *rp;
+      }
+      for (lp = row_buf + 1; i < row_bytes;
+         i++, rp++, lp++, dp++)
+      {
+         *dp = (png_byte)(((int)*rp - (int)*lp) & 0xff);
+      }
+      best_row = png_ptr->sub_row;
+   }
+
+   else if (filter_to_do & PNG_FILTER_SUB)
    {
       png_bytep rp, dp, lp;
       png_uint_32 sum = 0, lmins = mins;
-      png_size_t i;
+      png_uint_32 i;
       int v;
 
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
-      /* We temporarily increase the "minumum sum" by the factor we
+      /* We temporarily increase the "minimum sum" by the factor we
        * would reduce the sum of this filter, so that we can do the
        * early exit comparison without scaling the sum each time.
        */
       if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
       {
+         int j;
          png_uint_32 lmhi, lmlo;
          lmlo = lmins & PNG_LOMASK;
          lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;
 
-         for (i = 0; i < png_ptr->num_prev_filters; i++)
+         for (j = 0; j < num_p_filters; j++)
          {
-            if (png_ptr->prev_filters[i] == PNG_FILTER_VALUE_SUB)
+            if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_SUB)
             {
-               lmlo = (lmlo * png_ptr->inv_filter_weights[i]) >>
+               lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >>
                   PNG_WEIGHT_SHIFT;
-               lmhi = (lmhi * png_ptr->inv_filter_weights[i]) >>
+               lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >>
                   PNG_WEIGHT_SHIFT;
             }
          }
@@ -1506,7 +1546,8 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
 
          sum += (v < 128) ? v : 256 - v;
       }
-      for (lp = row_buf + 1; i < row_info->rowbytes; i++, rp++, lp++, dp++)
+      for (lp = row_buf + 1; i < row_info->rowbytes;
+         i++, rp++, lp++, dp++)
       {
          v = *dp = (png_byte)(((int)*rp - (int)*lp) & 0xff);
 
@@ -1519,17 +1560,18 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
       if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
       {
+         int j;
          png_uint_32 sumhi, sumlo;
          sumlo = sum & PNG_LOMASK;
          sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;
 
-         for (i = 0; i < png_ptr->num_prev_filters; i++)
+         for (j = 0; j < num_p_filters; j++)
          {
-            if (png_ptr->prev_filters[i] == PNG_FILTER_VALUE_SUB)
+            if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_SUB)
             {
-               sumlo = (sumlo * png_ptr->inv_filter_weights[i]) >>
+               sumlo = (sumlo * png_ptr->inv_filter_weights[j]) >>
                   PNG_WEIGHT_SHIFT;
-               sumhi = (sumhi * png_ptr->inv_filter_weights[i]) >>
+               sumhi = (sumhi * png_ptr->inv_filter_weights[j]) >>
                   PNG_WEIGHT_SHIFT;
             }
          }
@@ -1554,27 +1596,43 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
    }
 
    /* up filter */
-   if (png_ptr->do_filter & PNG_FILTER_UP)
+   if (filter_to_do == PNG_FILTER_UP)
+   {
+      png_bytep rp, dp, pp;
+      png_uint_32 i;
+
+      for (i = 0, rp = row_buf + 1, dp = png_ptr->up_row + 1,
+           pp = prev_row + 1; i < row_bytes;
+           i++, rp++, pp++, dp++)
+      {
+         *dp = (png_byte)(((int)*rp - (int)*pp) & 0xff);
+      }
+      best_row = png_ptr->up_row;
+   }
+
+   else if (filter_to_do & PNG_FILTER_UP)
    {
       png_bytep rp, dp, pp;
       png_uint_32 sum = 0, lmins = mins;
-      png_size_t i;
+      png_uint_32 i;
       int v;
 
+
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
       if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
       {
+         int j;
          png_uint_32 lmhi, lmlo;
          lmlo = lmins & PNG_LOMASK;
          lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;
 
-         for (i = 0; i < png_ptr->num_prev_filters; i++)
+         for (j = 0; j < num_p_filters; j++)
          {
-            if (png_ptr->prev_filters[i] == PNG_FILTER_VALUE_UP)
+            if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_UP)
             {
-               lmlo = (lmlo * png_ptr->inv_filter_weights[i]) >>
+               lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >>
                   PNG_WEIGHT_SHIFT;
-               lmhi = (lmhi * png_ptr->inv_filter_weights[i]) >>
+               lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >>
                   PNG_WEIGHT_SHIFT;
             }
          }
@@ -1592,9 +1650,9 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
 #endif
 
       for (i = 0, rp = row_buf + 1, dp = png_ptr->up_row + 1,
-           pp = prev_row + 1; i < row_info->rowbytes; i++, rp++, pp++, dp++)
+           pp = prev_row + 1; i < row_bytes; i++)
       {
-         v = *dp = (png_byte)(((int)*rp - (int)*pp) & 0xff);
+         v = *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff);
 
          sum += (v < 128) ? v : 256 - v;
 
@@ -1605,17 +1663,18 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
       if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
       {
+         int j;
          png_uint_32 sumhi, sumlo;
          sumlo = sum & PNG_LOMASK;
          sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;
 
-         for (i = 0; i < png_ptr->num_prev_filters; i++)
+         for (j = 0; j < num_p_filters; j++)
          {
-            if (png_ptr->prev_filters[i] == PNG_FILTER_UP)
+            if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_UP)
             {
-               sumlo = (sumlo * png_ptr->filter_weights[i]) >>
+               sumlo = (sumlo * png_ptr->filter_weights[j]) >>
                   PNG_WEIGHT_SHIFT;
-               sumhi = (sumhi * png_ptr->filter_weights[i]) >>
+               sumhi = (sumhi * png_ptr->filter_weights[j]) >>
                   PNG_WEIGHT_SHIFT;
             }
          }
@@ -1640,27 +1699,45 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
    }
 
    /* avg filter */
-   if (png_ptr->do_filter & PNG_FILTER_AVG)
+   if (filter_to_do == PNG_FILTER_AVG)
+   {
+      png_bytep rp, dp, pp, lp;
+      png_uint_32 i;
+      for (i = 0, rp = row_buf + 1, dp = png_ptr->avg_row + 1,
+           pp = prev_row + 1; i < bpp; i++)
+      {
+         *dp++ = (png_byte)(((int)*rp++ - ((int)*pp++ / 2)) & 0xff);
+      }
+      for (lp = row_buf + 1; i < row_bytes; i++)
+      {
+         *dp++ = (png_byte)(((int)*rp++ - (((int)*pp++ + (int)*lp++) / 2))
+                 & 0xff);
+      }
+      best_row = png_ptr->avg_row;
+   }
+
+   else if (filter_to_do & PNG_FILTER_AVG)
    {
       png_bytep rp, dp, pp, lp;
       png_uint_32 sum = 0, lmins = mins;
-      png_size_t i;
+      png_uint_32 i;
       int v;
 
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
       if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
       {
+         int j;
          png_uint_32 lmhi, lmlo;
          lmlo = lmins & PNG_LOMASK;
          lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;
 
-         for (i = 0; i < png_ptr->num_prev_filters; i++)
+         for (j = 0; j < num_p_filters; j++)
          {
-            if (png_ptr->prev_filters[i] == PNG_FILTER_VALUE_AVG)
+            if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_AVG)
             {
-               lmlo = (lmlo * png_ptr->inv_filter_weights[i]) >>
+               lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >>
                   PNG_WEIGHT_SHIFT;
-               lmhi = (lmhi * png_ptr->inv_filter_weights[i]) >>
+               lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >>
                   PNG_WEIGHT_SHIFT;
             }
          }
@@ -1678,16 +1755,16 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
 #endif
 
       for (i = 0, rp = row_buf + 1, dp = png_ptr->avg_row + 1,
-           pp = prev_row + 1; i < bpp; i++, rp++, pp++, dp++)
+           pp = prev_row + 1; i < bpp; i++)
       {
-         v = *dp = (png_byte)(((int)*rp - ((int)*pp / 2)) & 0xff);
+         v = *dp++ = (png_byte)(((int)*rp++ - ((int)*pp++ / 2)) & 0xff);
 
          sum += (v < 128) ? v : 256 - v;
       }
-      for (lp = row_buf + 1; i < row_info->rowbytes;
-           i++, rp++, pp++, lp++, dp++)
+      for (lp = row_buf + 1; i < row_bytes; i++)
       {
-         v = *dp = (png_byte)(((int)*rp - (((int)*pp + (int)*lp) / 2)) & 0xff);
+         v = *dp++ = 
+          (png_byte)(((int)*rp++ - (((int)*pp++ + (int)*lp++) / 2)) & 0xff);
 
          sum += (v < 128) ? v : 256 - v;
 
@@ -1698,17 +1775,18 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
       if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
       {
+         int j;
          png_uint_32 sumhi, sumlo;
          sumlo = sum & PNG_LOMASK;
          sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;
 
-         for (i = 0; i < png_ptr->num_prev_filters; i++)
+         for (j = 0; j < num_p_filters; j++)
          {
-            if (png_ptr->prev_filters[i] == PNG_FILTER_NONE)
+            if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_NONE)
             {
-               sumlo = (sumlo * png_ptr->filter_weights[i]) >>
+               sumlo = (sumlo * png_ptr->filter_weights[j]) >>
                   PNG_WEIGHT_SHIFT;
-               sumhi = (sumhi * png_ptr->filter_weights[i]) >>
+               sumhi = (sumhi * png_ptr->filter_weights[j]) >>
                   PNG_WEIGHT_SHIFT;
             }
          }
@@ -1733,27 +1811,66 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
    }
 
    /* Paeth filter */
-   if (png_ptr->do_filter & PNG_FILTER_PAETH)
+   if (filter_to_do == PNG_FILTER_PAETH)
+   {
+      png_bytep rp, dp, pp, cp, lp;
+      png_uint_32 i;
+      for (i = 0, rp = row_buf + 1, dp = png_ptr->paeth_row + 1,
+           pp = prev_row + 1; i < bpp; i++)
+      {
+         *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff);
+      }
+
+      for (lp = row_buf + 1, cp = prev_row + 1; i < row_bytes; i++)
+      {
+         int a, b, c, pa, pb, pc, p;
+
+         b = *pp++;
+         c = *cp++;
+         a = *lp++;
+
+         p = b - c;
+         pc = a - c;
+
+#ifdef PNG_USE_ABS
+         pa = abs(p);
+         pb = abs(pc);
+         pc = abs(p + pc);
+#else
+         pa = p < 0 ? -p : p;
+         pb = pc < 0 ? -pc : pc;
+         pc = (p + pc) < 0 ? -(p + pc) : p + pc;
+#endif
+
+         p = (pa <= pb && pa <=pc) ? a : (pb <= pc) ? b : c;
+
+         *dp++ = (png_byte)(((int)*rp++ - p) & 0xff);
+      }
+      best_row = png_ptr->paeth_row;
+   }
+
+   else if (filter_to_do & PNG_FILTER_PAETH)
    {
       png_bytep rp, dp, pp, cp, lp;
       png_uint_32 sum = 0, lmins = mins;
-      png_size_t i;
+      png_uint_32 i;
       int v;
 
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
       if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
       {
+         int j;
          png_uint_32 lmhi, lmlo;
          lmlo = lmins & PNG_LOMASK;
          lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;
 
-         for (i = 0; i < png_ptr->num_prev_filters; i++)
+         for (j = 0; j < num_p_filters; j++)
          {
-            if (png_ptr->prev_filters[i] == PNG_FILTER_VALUE_PAETH)
+            if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_PAETH)
             {
-               lmlo = (lmlo * png_ptr->inv_filter_weights[i]) >>
+               lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >>
                   PNG_WEIGHT_SHIFT;
-               lmhi = (lmhi * png_ptr->inv_filter_weights[i]) >>
+               lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >>
                   PNG_WEIGHT_SHIFT;
             }
          }
@@ -1771,34 +1888,48 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
 #endif
 
       for (i = 0, rp = row_buf + 1, dp = png_ptr->paeth_row + 1,
-           pp = prev_row + 1; i < bpp; i++, rp++, pp++, dp++)
+           pp = prev_row + 1; i < bpp; i++)
       {
-         v = *dp = (png_byte)(((int)*rp - (int)*pp) & 0xff);
+         v = *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff);
 
          sum += (v < 128) ? v : 256 - v;
       }
-      for (lp = row_buf + 1, cp = prev_row + 1; i < row_info->rowbytes;
-           i++, rp++, pp++, lp++, dp++, cp++)
+
+      for (lp = row_buf + 1, cp = prev_row + 1; i < row_bytes; i++)
       {
          int a, b, c, pa, pb, pc, p;
 
-         b = *pp;
-         c = *cp;
-         a = *lp;
+         b = *pp++;
+         c = *cp++;
+         a = *lp++;
 
+#ifndef PNG_SLOW_PAETH
+         p = b - c;
+         pc = a - c;
+#ifdef PNG_USE_ABS
+         pa = abs(p);
+         pb = abs(pc);
+         pc = abs(p + pc);
+#else
+         pa = p < 0 ? -p : p;
+         pb = pc < 0 ? -pc : pc;
+         pc = (p + pc) < 0 ? -(p + pc) : p + pc;
+#endif
+         p = (pa <= pb && pa <=pc) ? a : (pb <= pc) ? b : c;
+#else /* PNG_SLOW_PAETH */
          p = a + b - c;
          pa = abs(p - a);
          pb = abs(p - b);
          pc = abs(p - c);
-
          if (pa <= pb && pa <= pc)
             p = a;
          else if (pb <= pc)
             p = b;
          else
             p = c;
+#endif /* PNG_SLOW_PAETH */
 
-         v = *dp = (png_byte)(((int)*rp - p) & 0xff);
+         v = *dp++ = (png_byte)(((int)*rp++ - p) & 0xff);
 
          sum += (v < 128) ? v : 256 - v;
 
@@ -1809,17 +1940,18 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
       if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
       {
+         int j;
          png_uint_32 sumhi, sumlo;
          sumlo = sum & PNG_LOMASK;
          sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;
 
-         for (i = 0; i < png_ptr->num_prev_filters; i++)
+         for (j = 0; j < num_p_filters; j++)
          {
-            if (png_ptr->prev_filters[i] == PNG_FILTER_PAETH)
+            if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_PAETH)
             {
-               sumlo = (sumlo * png_ptr->filter_weights[i]) >>
+               sumlo = (sumlo * png_ptr->filter_weights[j]) >>
                   PNG_WEIGHT_SHIFT;
-               sumhi = (sumhi * png_ptr->filter_weights[i]) >>
+               sumhi = (sumhi * png_ptr->filter_weights[j]) >>
                   PNG_WEIGHT_SHIFT;
             }
          }
@@ -1843,19 +1975,19 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
    }
 
    /* Do the actual writing of the filtered row data from the chosen filter. */
+
    png_write_filtered_row(png_ptr, best_row);
 
 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
    /* Save the type of filter we picked this time for future calculations */
    if (png_ptr->num_prev_filters > 0)
    {
-      png_byte i;
-
-      for (i = 1; i < png_ptr->num_prev_filters; i++)
+      int j;
+      for (j = 1; j < num_p_filters; j++)
       {
-         png_ptr->prev_filters[i] = png_ptr->prev_filters[i - 1];
+         png_ptr->prev_filters[j] = png_ptr->prev_filters[j - 1];
       }
-      png_ptr->prev_filters[i] = best_row[0];
+      png_ptr->prev_filters[j] = best_row[0];
    }
 #endif
 }
@@ -1920,4 +2052,3 @@ png_write_filtered_row(png_structp png_ptr, png_bytep filtered_row)
    }
 #endif /* PNG_WRITE_FLUSH_SUPPORTED */
 }
-

scripts/SCOPTIONS.ppc

@@ -0,0 +1,7 @@
+OPTIMIZE
+OPTPEEP
+OPTTIME
+OPTSCHED
+AUTOREGISTER
+PARMS=REGISTERS
+INCLUDEDIR=hlp:ppc/include

scripts/makefile.dec

@@ -29,7 +29,7 @@ libpng.a: $(OBJS)
 	$(RANLIB) $@
 
 pngtest: pngtest.o libpng.a
-	$(CC) -o pngtest $(CCFLAGS) pngtest.o $(LDFLAGS)
+	$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)
 
 test: pngtest
 	./pngtest

scripts/makefile.dj2

@@ -23,7 +23,7 @@ libpng.a: $(OBJS)
 	$(RANLIB) $@
 
 pngtest: pngtest.o libpng.a
-	$(CC) -o pngtest $(CCFLAGS) pngtest.o $(LDFLAGS)
+	$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)
 	coff2exe pngtest
 
 test: pngtest

scripts/makefile.knr

@@ -34,8 +34,8 @@ libpng.a: ansi2knr $(OBJS)
 	ar rc $@  $(OBJS)
 	$(RANLIB) $@
 
-pngtest: pngtest.o libpng.a ansi2knr
-	cc -o pngtest $(CCFLAGS) pngtest.o $(LDFLAGS)
+pngtest: pngtest.o libpng.a
+	$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)
 
 test: pngtest
 	./pngtest

scripts/makefile.lnx

@@ -1,6 +1,6 @@
 # makefile for libpng on Linux ELF with gcc
 # Copyright (C) 1996, 1997 Andreas Dilger
-# Copyright (C) 1998 Glenn Randers-Pehrson
+# Copyright (C) 1998 Greg Roelofs
 # For conditions of distribution and use, see copyright notice in png.h
 
 CC=gcc
@@ -11,18 +11,25 @@ CC=gcc
 ZLIBLIB=../zlib
 ZLIBINC=../zlib
 
+ALIGN=
+# For I-386:
+#ALIGN=-malign-loops=2 -malign-functions=2
+
 WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
          -Wmissing-declarations -Wtraditional -Wcast-align \
          -Wstrict-prototypes -Wmissing-prototypes #-Wconversion
-CFLAGS=-I$(ZLIBINC) -Wall -O3 -funroll-loops -malign-loops=2 \
-       -malign-functions=2 #$(WARNMORE) -g -DPNG_DEBUG=5
+
+CFLAGS=-I$(ZLIBINC) -Wall -O3 -funroll-loops \
+     $(ALIGN) # $(WARNMORE) -g -DPNG_DEBUG=5
 LDFLAGS=-L. -Wl,-rpath,. -L$(ZLIBLIB) -Wl,-rpath,$(ZLIBLIB) -lpng -lz -lm
 
 RANLIB=ranlib
 #RANLIB=echo
 
+# read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
+# have to change it.
 PNGMAJ = 2
-PNGMIN = 0.97
+PNGMIN = 1.0.1c
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # where make install puts libpng.a, libpng.so*, and png.h
@@ -54,7 +61,7 @@ libpng.so.$(PNGMAJ): libpng.so.$(PNGVER)
 	ln -sf libpng.so.$(PNGVER) libpng.so.$(PNGMAJ)
 
 libpng.so.$(PNGVER): $(OBJSDLL)
-	gcc -shared -Wl,-soname,libpng.so.$(PNGMAJ) -o libpng.so.$(PNGVER) \
+	$(CC) -shared -Wl,-soname,libpng.so.$(PNGMAJ) -o libpng.so.$(PNGVER) \
 	 $(OBJSDLL)
 
 pngtest: pngtest.o libpng.so

scripts/makefile.mip

@@ -24,7 +24,7 @@ libpng.a: $(OBJS)
 	$(RANLIB) $@
 
 pngtest: pngtest.o libpng.a
-	cc -o pngtest $(CCFLAGS) pngtest.o $(LDFLAGS)
+	$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)
 
 test: pngtest
 	./pngtest

scripts/makefile.msc

@@ -5,7 +5,7 @@
 
 # ------------- Microsoft C 5.1 and later -------------
 MODEL=-AL
-CFLAGS=-Oait -Gs -nologo -W2 $(MODEL) -I..\zlib
+CFLAGS=-Oait -Gs -nologo -W3 $(MODEL) -I..\zlib
 #-Ox generates bad code with MSC 5.1
 CC=cl
 LD=link

scripts/makefile.os2

@@ -0,0 +1,69 @@
+# makefile for libpng on OS/2 with gcc
+# For conditions of distribution and use, see copyright notice in png.h
+
+# Related files: pngos2.def
+
+CC=gcc -Zomf -s
+
+# Where the zlib library and include files are located
+ZLIBLIB=../zlib
+ZLIBINC=../zlib
+
+WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
+         -Wmissing-declarations -Wtraditional -Wcast-align \
+         -Wstrict-prototypes -Wmissing-prototypes #-Wconversion
+CFLAGS=-I$(ZLIBINC) -Wall -O6 -funroll-loops -malign-loops=2 \
+       -malign-functions=2 #$(WARNMORE) -g -DPNG_DEBUG=5
+LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lzdll -Zcrtdll
+AR=emxomfar
+
+PNGLIB=png.lib
+IMPLIB=emximp
+SHAREDLIB=png.dll
+SHAREDLIBIMP=pngdll.lib
+
+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
+
+.SUFFIXES:      .c .o
+
+all: $(PNGLIB) $(SHAREDLIB) $(SHAREDLIBIMP)
+
+$(PNGLIB): $(OBJS)
+	$(AR) rc $@ $(OBJS)
+
+$(SHAREDLIB): $(OBJS) pngos2.def
+	$(CC) $(LDFLAGS) -Zdll -o $@ $^
+
+$(SHAREDLIBIMP): pngos2.def
+	$(IMPLIB) -o $@ $^
+
+pngtest.exe: pngtest.o png.dll pngdll.lib
+	$(CC) -o $@ $(CFLAGS) $< $(LDFLAGS)
+
+test: pngtest.exe
+	./pngtest.exe
+
+clean:
+	rm -f *.o $(PNGLIB) png.dll pngdll.lib pngtest.exe pngout.png
+
+# DO NOT DELETE THIS LINE -- make depend depends on it.
+
+png.o png.pic.o: png.h pngconf.h
+pngerror.o pngerror.pic.o: png.h pngconf.h
+pngrio.o pngrio.pic.o: png.h pngconf.h
+pngwio.o pngwio.pic.o: png.h pngconf.h
+pngmem.o pngmem.pic.o: png.h pngconf.h
+pngset.o pngset.pic.o: png.h pngconf.h
+pngget.o pngget.pic.o: png.h pngconf.h
+pngread.o pngread.pic.o: png.h pngconf.h
+pngrtran.o pngrtran.pic.o: png.h pngconf.h
+pngrutil.o pngrutil.pic.o: png.h pngconf.h
+pngtrans.o pngtrans.pic.o: png.h pngconf.h
+pngwrite.o pngwrite.pic.o: png.h pngconf.h
+pngwtran.o pngwtran.pic.o: png.h pngconf.h
+pngwutil.o pngwutil.pic.o: png.h pngconf.h
+pngpread.o pngpread.pic.o: png.h pngconf.h
+
+pngtest.o: png.h pngconf.h

scripts/makefile.s2x

@@ -0,0 +1,104 @@
+# makefile for libpng on Solaris 2.x with gcc
+# Contributed by William L. Sebok, based on makefile.lnx
+# Copyright (C) 1996, 1997 Andreas Dilger
+# Copyright (C) 1998 Greg Roelofs
+# For conditions of distribution and use, see copyright notice in png.h
+
+CC=gcc
+
+# Where the zlib library and include files are located
+# Changing these to ../zlib poses a security risk.  If you want
+# to have zlib in an adjacent directory, specify the full path instead of "..".
+#ZLIBLIB=../zlib
+#ZLIBINC=../zlib
+
+ZLIBLIB=/usr/local/lib
+ZLIBINC=/usr/local/include
+
+
+WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow \
+         -Wmissing-declarations -Wtraditional -Wcast-align \
+         -Wstrict-prototypes -Wmissing-prototypes #-Wconversion
+CFLAGS=-I$(ZLIBINC) -Wall -O3 \
+      # $(WARNMORE) -g -DPNG_DEBUG=5
+LDFLAGS=-L. -R. -L$(ZLIBLIB) -R$(ZLIBLIB) -lpng -lz -lm
+
+#RANLIB=ranlib
+RANLIB=echo
+
+# read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
+# have to change it.
+PNGMAJ = 2
+PNGMIN = 1.0.1c
+PNGVER = $(PNGMAJ).$(PNGMIN)
+
+# where make install puts libpng.a, libpng.so*, and png.h
+prefix=/usr/local
+INCPATH=$(prefix)/include
+LIBPATH=$(prefix)/lib
+
+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
+
+OBJSDLL = $(OBJS:.o=.pic.o)
+
+.SUFFIXES:      .c .o .pic.o
+
+.c.pic.o:
+	$(CC) -c $(CFLAGS) -fPIC -o $@ $*.c
+
+all: libpng.a libpng.so pngtest
+
+libpng.a: $(OBJS)
+	ar rc $@ $(OBJS)
+	$(RANLIB) $@
+
+libpng.so: libpng.so.$(PNGMAJ)
+	ln -sf libpng.so.$(PNGMAJ) libpng.so
+
+libpng.so.$(PNGMAJ): libpng.so.$(PNGVER)
+	ln -sf libpng.so.$(PNGVER) libpng.so.$(PNGMAJ)
+
+libpng.so.$(PNGVER): $(OBJSDLL)
+	$(LD) -G -L$(ZLIBLIB) -R$(ZLIBLIB) -h libpng.so.$(PNGMAJ) \
+	 -o libpng.so.$(PNGVER) $(OBJSDLL) -lz
+
+pngtest: pngtest.o libpng.so
+	$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)
+
+test: pngtest
+	./pngtest
+
+install: libpng.a libpng.so.$(PNGVER)
+	-@mkdir $(INCPATH) $(LIBPATH)
+	cp png.h pngconf.h $(INCPATH)
+	chmod 644 $(INCPATH)/png.h $(INCPATH)/pngconf.h
+	cp libpng.a libpng.so.$(PNGVER) $(LIBPATH)
+	chmod 755 $(LIBPATH)/libpng.so.$(PNGVER)
+	-@/bin/rm -f $(LIBPATH)/libpng.so.$(PNGMAJ) $(LIBPATH)/libpng.so
+	(cd $(LIBPATH); ln -sf libpng.so.$(PNGVER) libpng.so.$(PNGMAJ); \
+	 ln -sf libpng.so.$(PNGMAJ) libpng.so)
+
+clean:
+	/bin/rm -f *.o libpng.a libpng.so* pngtest pngout.png
+
+# DO NOT DELETE THIS LINE -- make depend depends on it.
+
+png.o png.pic.o: png.h pngconf.h
+pngerror.o pngerror.pic.o: png.h pngconf.h
+pngrio.o pngrio.pic.o: png.h pngconf.h
+pngwio.o pngwio.pic.o: png.h pngconf.h
+pngmem.o pngmem.pic.o: png.h pngconf.h
+pngset.o pngset.pic.o: png.h pngconf.h
+pngget.o pngget.pic.o: png.h pngconf.h
+pngread.o pngread.pic.o: png.h pngconf.h
+pngrtran.o pngrtran.pic.o: png.h pngconf.h
+pngrutil.o pngrutil.pic.o: png.h pngconf.h
+pngtrans.o pngtrans.pic.o: png.h pngconf.h
+pngwrite.o pngwrite.pic.o: png.h pngconf.h
+pngwtran.o pngwtran.pic.o: png.h pngconf.h
+pngwutil.o pngwutil.pic.o: png.h pngconf.h
+pngpread.o pngpread.pic.o: png.h pngconf.h
+
+pngtest.o: png.h pngconf.h

scripts/makefile.sco

@@ -0,0 +1,97 @@
+# makefile for SCO OSr5  ELF and Unixware 7 with Native cc
+# Contributed by Mike Hopkirk (hops@sco.com) modified from Makefile.lnx
+#   force ELF build dynamic linking, SONAME setting in lib and RPATH in app
+# Copyright (C) 1996, 1997 Andreas Dilger
+# Copyright (C) 1998 Greg Roelofs
+# For conditions of distribution and use, see copyright notice in png.h
+
+CC=cc
+
+# Where the zlib library and include files are located
+#ZLIBLIB=/usr/local/lib
+#ZLIBINC=/usr/local/include
+ZLIBLIB=../zlib
+ZLIBINC=../zlib
+
+CFLAGS= -dy -belf -I$(ZLIBINC) -O3 
+LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm
+
+#RANLIB=ranlib
+RANLIB=echo
+
+# read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
+# have to change it.
+PNGMAJ = 2
+PNGMIN = 1.0.1c
+PNGVER = $(PNGMAJ).$(PNGMIN)
+
+# where make install puts libpng.a, libpng.so*, and png.h
+prefix=/usr/local
+INCPATH=$(prefix)/include
+LIBPATH=$(prefix)/lib
+
+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
+
+OBJSDLL = $(OBJS:.o=.pic.o)
+
+.SUFFIXES:      .c .o .pic.o
+
+.c.pic.o:
+	$(CC) -c $(CFLAGS) -KPIC -o $@ $*.c
+
+all: libpng.a libpng.so pngtest
+
+libpng.a: $(OBJS)
+	ar rc $@ $(OBJS)
+	$(RANLIB) $@
+
+libpng.so: libpng.so.$(PNGMAJ)
+	ln -sf libpng.so.$(PNGMAJ) libpng.so
+
+libpng.so.$(PNGMAJ): libpng.so.$(PNGVER)
+	ln -sf libpng.so.$(PNGVER) libpng.so.$(PNGMAJ)
+
+libpng.so.$(PNGVER): $(OBJSDLL)
+	$(CC) -G  -Wl,-h,libpng.so.$(PNGMAJ) -o libpng.so.$(PNGVER) \
+	 $(OBJSDLL)
+
+pngtest: pngtest.o libpng.so
+	LD_RUN_PATH=.:$(ZLIBLIB) $(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)
+
+test: pngtest
+	./pngtest
+
+install: libpng.a libpng.so.$(PNGVER)
+	-@mkdir $(INCPATH) $(LIBPATH)
+	cp png.h pngconf.h $(INCPATH)
+	chmod 644 $(INCPATH)/png.h $(INCPATH)/pngconf.h
+	cp libpng.a libpng.so.$(PNGVER) $(LIBPATH)
+	chmod 755 $(LIBPATH)/libpng.so.$(PNGVER)
+	-@/bin/rm -f $(LIBPATH)/libpng.so.$(PNGMAJ) $(LIBPATH)/libpng.so
+	(cd $(LIBPATH); ln -sf libpng.so.$(PNGVER) libpng.so.$(PNGMAJ); \
+	 ln -sf libpng.so.$(PNGMAJ) libpng.so)
+
+clean:
+	/bin/rm -f *.o libpng.a libpng.so* pngtest pngout.png
+
+# DO NOT DELETE THIS LINE -- make depend depends on it.
+
+png.o png.pic.o: png.h pngconf.h
+pngerror.o pngerror.pic.o: png.h pngconf.h
+pngrio.o pngrio.pic.o: png.h pngconf.h
+pngwio.o pngwio.pic.o: png.h pngconf.h
+pngmem.o pngmem.pic.o: png.h pngconf.h
+pngset.o pngset.pic.o: png.h pngconf.h
+pngget.o pngget.pic.o: png.h pngconf.h
+pngread.o pngread.pic.o: png.h pngconf.h
+pngrtran.o pngrtran.pic.o: png.h pngconf.h
+pngrutil.o pngrutil.pic.o: png.h pngconf.h
+pngtrans.o pngtrans.pic.o: png.h pngconf.h
+pngwrite.o pngwrite.pic.o: png.h pngconf.h
+pngwtran.o pngwtran.pic.o: png.h pngconf.h
+pngwutil.o pngwutil.pic.o: png.h pngconf.h
+pngpread.o pngpread.pic.o: png.h pngconf.h
+
+pngtest.o: png.h pngconf.h

scripts/makefile.sgi

@@ -0,0 +1,70 @@
+# makefile for libpng
+# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
+# For conditions of distribution and use, see copyright notice in png.h
+
+# Where the zlib library and include files are located
+#ZLIBLIB=/usr/local/lib
+#ZLIBINC=/usr/local/include
+ZLIBLIB=../zlib
+ZLIBINC=../zlib
+
+CC=cc
+
+WARNMORE=-fullwarn
+CFLAGS=-I$(ZLIBINC) -O $(WARNMORE) # -g -DPNG_DEBUG=5
+LDFLAGS=-L. -L$(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
+
+all: libpng.a pngtest
+
+libpng.a: $(OBJS)
+	ar rc $@  $(OBJS)
+	$(RANLIB) $@
+
+pngtest: pngtest.o libpng.a
+	$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)
+
+test: pngtest
+	./pngtest
+
+install: libpng.a
+	-@mkdir $(prefix)/include
+	-@mkdir $(prefix)/lib
+	cp png.h $(prefix)/include
+	cp pngconf.h $(prefix)/include
+	chmod 644 $(prefix)/include/png.h
+	chmod 644 $(prefix)/include/pngconf.h
+	cp libpng.a $(prefix)/lib
+	chmod 644 $(prefix)/lib/libpng.a
+
+clean:
+	rm -f *.o libpng.a pngtest pngout.png
+
+# DO NOT DELETE THIS LINE -- make depend depends on it.
+
+png.o: png.h pngconf.h
+pngerror.o: png.h pngconf.h
+pngrio.o: png.h pngconf.h
+pngwio.o: png.h pngconf.h
+pngmem.o: png.h pngconf.h
+pngset.o: png.h pngconf.h
+pngget.o: png.h pngconf.h
+pngread.o: png.h pngconf.h
+pngrtran.o: png.h pngconf.h
+pngrutil.o: png.h pngconf.h
+pngtest.o: png.h pngconf.h
+pngtrans.o: png.h pngconf.h
+pngwrite.o: png.h pngconf.h
+pngwtran.o: png.h pngconf.h
+pngwutil.o: png.h pngconf.h
+pngpread.o: png.h pngconf.h
+

scripts/makefile.std

@@ -9,7 +9,7 @@ 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
@@ -29,7 +29,7 @@ libpng.a: $(OBJS)
 	$(RANLIB) $@
 
 pngtest: pngtest.o libpng.a
-	$(CC) -o pngtest $(CCFLAGS) pngtest.o $(LDFLAGS)
+	$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)
 
 test: pngtest
 	./pngtest

scripts/makefile.sun

@@ -13,7 +13,7 @@ WARNMORE=-Wwrite-strings -Wpointer-arith -Wshadow -Wconversion \
          -Wmissing-declarations -Wtraditional -Wcast-align \
          -Wstrict-prototypes -Wmissing-prototypes
 CC=gcc
-CFLAGS=-I$(ZLIBINC) -O $(WARNMORE) -DPNG_DEBUG=4
+CFLAGS=-I$(ZLIBINC) -O # $(WARNMORE) -DPNG_DEBUG=5
 LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm
 
 RANLIB=ranlib
@@ -33,7 +33,7 @@ libpng.a: $(OBJS)
 	$(RANLIB) $@
 
 pngtest: pngtest.o libpng.a
-	$(CC) -o pngtest $(CCFLAGS) pngtest.o $(LDFLAGS)
+	$(CC) -o pngtest $(CFLAGS) pngtest.o $(LDFLAGS)
 
 test: pngtest
 	./pngtest

scripts/makefile.tc3

@@ -1,7 +1,7 @@
 # Makefile for libpng
 # TurboC++ 3.0 (Note: All modules are compiled in C mode)
 
-# To use, do "make -fmakefile.tc"
+# To use, do "make -fmakefile.tc3"
 
 # ------------- Turbo C++ 3.0 -------------
 MODEL=-ml
@@ -9,8 +9,9 @@ CFLAGS=-O2 -Z $(MODEL) -I..\zlib
 CC=tcc
 LD=tcc
 LIB=tlib
-LDFLAGS=$(MODEL)
+LDFLAGS=$(MODEL) -L..\zlib
 O=.obj
+E=.exe
 
 # variables
 OBJS1 = png$(O) pngset$(O) pngget$(O) pngrutil$(O) pngtrans$(O) pngwutil$(O)
@@ -20,7 +21,7 @@ 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
+all: libpng.lib pngtest.exe
 
 png$(O): png.h pngconf.h
 		  $(CC) -c $(CFLAGS) $*.c
@@ -75,4 +76,7 @@ libpng.lib: $(OBJS1) $(OBJS2) $(OBJS3)
         $(LIB) libpng +$(OBJSL2)
         $(LIB) libpng +$(OBJSL3)
 
+pngtest$(E): pngtest$(O) libpng.lib
+        $(CC) $(LDFLAGS) pngtest.obj libpng.lib zlib.lib
+
 # End of makefile for libpng

scripts/makefile.wat

@@ -0,0 +1,88 @@
+# Makefile for libpng
+# Watcom 10.0a and later 32-bit protected mode flat memory model
+
+# Adapted by Pawel Mrochen, based on makefile.msc
+# 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
+
+# To use, do "wmake -f makefile.wat"
+
+# ------------- Watcom 10.0a and later -------------
+MODEL=-mf
+CFLAGS= $(MODEL) -5r -fp5 -fpi87 -oneatx -zp8 -i=..\zlib
+CC=wcc386
+LD=wcl386
+LIB=wlib -b -c
+LDFLAGS=
+O=.obj
+
+#uncomment next to put error messages in a file
+#ERRFILE= >> pngerrs
+
+# variables
+OBJS1 = png$(O) pngset$(O) pngget$(O) pngrutil$(O) pngtrans$(O) pngwutil$(O)
+OBJS2 = pngmem$(O) pngpread$(O) pngread$(O) pngerror$(O) pngwrite$(O)
+OBJS3 = pngrtran$(O) pngwtran$(O) pngrio$(O) pngwio$(O)
+
+all: test
+
+png$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngset$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngget$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngread$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngpread$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngrtran$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngrutil$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngerror$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngmem$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngrio$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngwio$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngtest$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngtrans$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngwrite$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngwtran$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+pngwutil$(O): png.h pngconf.h
+	$(CC) $(CFLAGS) $*.c $(ERRFILE)
+
+libpng.lib: $(OBJS1) $(OBJS2) $(OBJS3)
+	$(LIB) -n libpng.lib $(OBJS1)
+	$(LIB) libpng.lib $(OBJS2)
+	$(LIB) libpng.lib $(OBJS3)
+
+pngtest.exe: pngtest.obj libpng.lib
+	$(LD) $(LDFLAGS) pngtest.obj libpng.lib ..\zlib\zlib.lib
+
+test: pngtest.exe
+	pngtest
+
+# End of makefile for libpng

scripts/pngos2.def

@@ -0,0 +1,286 @@
+;----------------------------------------
+; PNGLIB module definition file for OS/2
+;----------------------------------------
+
+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_check_sig
+  png_create_read_struct
+  png_create_write_struct
+  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_set_bgr
+  png_set_gray_to_rgb
+; png_set_rgb_to_gray
+  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_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_memcpy_check
+  png_memset_check
+; png_debug_malloc
+; png_debug_free
+; png_far_to_near
+  png_error
+  png_chunk_error
+  png_warning
+  png_chunk_warning
+  png_get_valid
+  png_get_rowbytes
+  png_get_channels
+  png_get_image_width
+  png_get_image_height
+  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_sBIT
+  png_get_sRGB
+  png_set_sRGB
+  png_set_sRGB_gAMA_and_cHRM
+  png_get_text
+  png_set_text
+  png_get_tIME
+  png_set_tIME
+  png_get_tRNS
+  png_set_tRNS
+
+  png_create_struct
+  png_destroy_struct
+  png_info_destroy
+  png_zalloc
+  png_zfree
+  png_reset_crc
+  png_write_data
+  png_read_data
+  png_crc_read
+  png_crc_finish
+  png_crc_error
+  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
+
+  png_libpng_ver
+  png_pass_start
+  png_pass_inc
+  png_pass_ystart
+  png_pass_yinc
+  png_pass_mask
+  png_pass_dsp_mask
+; png_pass_width
+; png_pass_height
+
+  png_IHDR
+  png_IDAT
+  png_IEND
+  png_PLTE
+  png_bKGD
+  png_cHRM
+  png_gAMA
+  png_hIST
+  png_oFFs
+  png_pCAL
+  png_pHYs
+  png_sBIT
+  png_sRGB
+  png_tEXt
+  png_tIME
+  png_tRNS
+  png_zTXt

scripts/smakefile.ppc

@@ -0,0 +1,29 @@
+# Amiga powerUP (TM) Makefile
+# makefile for libpng and SAS C V6.58/7.00 PPC compiler
+# Copyright (C) 1998 by Andreas R. Kleinert
+
+CC       = scppc
+CFLAGS   = NOSTKCHK NOSINT OPTIMIZE OPTGO OPTPEEP OPTINLOCAL OPTINL IDIR /zlib \
+           OPTLOOP OPTRDEP=8 OPTDEP=8 OPTCOMP=8
+LIBNAME  = libpng.a
+AR       = ppc-amigaos-ar
+AR_FLAGS = cr
+RANLIB   = ppc-amigaos-ranlib
+LDFLAGS  = -r -o
+LDLIBS   =  ../zlib/libzip.a LIB:scppc.a
+LN       = ppc-amigaos-ld
+RM       = delete quiet
+MKDIR    = makedir
+
+OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o pngread.o \
+pngerror.o pngpread.o pngwrite.o pngrtran.o pngwtran.o pngrio.o pngwio.o pngmem.o
+
+all: $(LIBNAME) pngtest
+
+$(LIBNAME): $(OBJS)
+            $(AR) $(AR_FLAGS) $@ $(OBJS)
+            $(RANLIB) $@
+
+pngtest: pngtest.o $(LIBNAME)
+        $(LN) $(LDFLAGS) pngtest LIB:c_ppc.o pngtest.o $(LIBNAME) $(LDLIBS) \
+LIB:end.o