code:
/* pngconf.h - machine configurable file for libpng
 *
 * libpng version 1.4.8 - July 7, 2011
 * For conditions of distribution and use, see copyright notice in png.h
 * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
 * This code is released under the libpng license.
 * For conditions of distribution and use, see the disclaimer
 * and license in png.h
 *
 */

/* Any machine specific code is near the front of this file, so if you
 * are configuring libpng for a machine, you may want to read the section
 * starting here down to where it starts to typedef png_color, png_text,
 * and png_info.
 */

#ifndef PNGCONF_H
#define PNGCONF_H

#ifndef PNG_NO_LIMITS_H
#  include <limits.h>
#endif

/* Added at libpng-1.2.9 */

/* config.h is created by and PNG_CONFIGURE_LIBPNG is set by the "configure"
 * script.
 */
#ifdef PNG_CONFIGURE_LIBPNG
#  ifdef HAVE_CONFIG_H
#    include "config.h"
#  endif
#endif

/*
 * Added at libpng-1.2.8
 *
 * PNG_USER_CONFIG has to be defined on the compiler command line. This
 * includes the resource compiler for Windows DLL configurations.
 */
#ifdef PNG_USER_CONFIG
#  include "pngusr.h"
#  ifndef PNG_USER_PRIVATEBUILD
#    define PNG_USER_PRIVATEBUILD
#  endif
#endif

/*
 * If you create a private DLL you should define in "pngusr.h" the following:
 * #define PNG_USER_PRIVATEBUILD <Describes by whom and why this version of
 *        the DLL was built>
 *  e.g. #define PNG_USER_PRIVATEBUILD "Build by MyCompany for xyz reasons."
 * #define PNG_USER_DLLFNAME_POSTFIX <two-letter postfix that serve to
 *        distinguish your DLL from those of the official release. These
 *        correspond to the trailing letters that come after the version
 *        number and must match your private DLL name>
 *  e.g. // private DLL "libpng14gx.dll"
 *       #define PNG_USER_DLLFNAME_POSTFIX "gx"
 *
 * The following macros are also at your disposal if you want to complete the
 * DLL VERSIONINFO structure.
 * - PNG_USER_VERSIONINFO_COMMENTS
 * - PNG_USER_VERSIONINFO_COMPANYNAME
 * - PNG_USER_VERSIONINFO_LEGALTRADEMARKS
 */

#ifdef __STDC__
#  ifdef SPECIALBUILD
#    pragma message("PNG_LIBPNG_SPECIALBUILD (and deprecated SPECIALBUILD)\
     are now LIBPNG reserved macros. Use PNG_USER_PRIVATEBUILD instead.")
#  endif

#  ifdef PRIVATEBUILD
#    pragma message("PRIVATEBUILD is deprecated.\
     Use PNG_USER_PRIVATEBUILD instead.")
#    define PNG_USER_PRIVATEBUILD PRIVATEBUILD
#  endif
#endif /* __STDC__ */

/* End of material added to libpng-1.2.8 */

/* Added at libpng-1.4.6 */
#ifndef PNG_UNUSED
/* Unused formal parameter warnings are silenced using the following macro
 * which is expected to have no bad effects on performance (optimizing
 * compilers will probably remove it entirely).  Note that if you replace
 * it with something other than whitespace, you must include the terminating
 * semicolon.
 */
#  define PNG_UNUSED(param) (void)param;
#endif
/* End of material added to libpng-1.4.6 */

#ifndef PNG_VERSION_INFO_ONLY

/* This is the size of the compression buffer, and thus the size of
 * an IDAT chunk.  Make this whatever size you feel is best for your
 * machine.  One of these will be allocated per png_struct.  When this
 * is full, it writes the data to the disk, and does some other
 * calculations.  Making this an extremely small size will slow
 * the library down, but you may want to experiment to determine
 * 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 than the size of a row (compressed),
 * it should not make much difference how big this is.
 */

#ifndef PNG_ZBUF_SIZE
#  define PNG_ZBUF_SIZE 8192
#endif

/* Enable if you want a write-only libpng */

#ifndef PNG_NO_READ_SUPPORTED
#  define PNG_READ_SUPPORTED
#endif

/* Enable if you want a read-only libpng */

#ifndef PNG_NO_WRITE_SUPPORTED
#  define PNG_WRITE_SUPPORTED
#endif

/* Enabled in 1.4.0. */
#ifdef PNG_ALLOW_BENIGN_ERRORS
#  define png_benign_error png_warning
#  define png_chunk_benign_error png_chunk_warning
#else
#  ifndef PNG_BENIGN_ERRORS_SUPPORTED
#    define png_benign_error png_error
#    define png_chunk_benign_error png_chunk_error
#  endif
#endif

/* Added at libpng version 1.4.0 */
#if !defined(PNG_NO_WARNINGS) && !defined(PNG_WARNINGS_SUPPORTED)
#  define PNG_WARNINGS_SUPPORTED
#endif

/* Added at libpng version 1.4.0 */
#if !defined(PNG_NO_ERROR_TEXT) && !defined(PNG_ERROR_TEXT_SUPPORTED)
#  define PNG_ERROR_TEXT_SUPPORTED
#endif

/* Added at libpng version 1.4.0 */
#if !defined(PNG_NO_CHECK_cHRM) && !defined(PNG_CHECK_cHRM_SUPPORTED)
#  define PNG_CHECK_cHRM_SUPPORTED
#endif

/* Added at libpng version 1.4.0 */
#if !defined(PNG_NO_ALIGNED_MEMORY) && !defined(PNG_ALIGNED_MEMORY_SUPPORTED)
#  define PNG_ALIGNED_MEMORY_SUPPORTED
#endif

/* Enabled by default in 1.2.0.  You can disable this if you don't need to
   support PNGs that are embedded in MNG datastreams */
#ifndef PNG_NO_MNG_FEATURES
#  ifndef PNG_MNG_FEATURES_SUPPORTED
#    define PNG_MNG_FEATURES_SUPPORTED
#  endif
#endif

/* Added at libpng version 1.4.0 */
#ifndef PNG_NO_FLOATING_POINT_SUPPORTED
#  ifndef PNG_FLOATING_POINT_SUPPORTED
#    define PNG_FLOATING_POINT_SUPPORTED
#  endif
#endif

/* Added at libpng-1.4.0beta49 for testing (this test is no longer used
   in libpng and png_calloc() is always present)
 */
#define PNG_CALLOC_SUPPORTED

/* If you are running on a machine where you cannot allocate more
 * than 64K of memory at once, uncomment this.  While libpng will not
 * normally need that much memory in a chunk (unless you load up a very
 * large file), zlib needs to know how big of a chunk it can use, and
 * libpng thus makes sure to check any memory allocation to verify it
 * will fit into memory.
#define PNG_MAX_MALLOC_64K
 */
#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
#  define PNG_MAX_MALLOC_64K
#endif

/* Special munging to support doing things the 'cygwin' way:
 * 'Normal' png-on-win32 defines/defaults:
 *   PNG_BUILD_DLL -- building dll
 *   PNG_USE_DLL   -- building an application, linking to dll
 *   (no define)   -- building static library, or building an
 *                    application and linking to the static lib
 * 'Cygwin' defines/defaults:
 *   PNG_BUILD_DLL -- (ignored) building the dll
 *   (no define)   -- (ignored) building an application, linking to the dll
 *   PNG_STATIC    -- (ignored) building the static lib, or building an
 *                    application that links to the static lib.
 *   ALL_STATIC    -- (ignored) building various static libs, or building an
 *                    application that links to the static libs.
 * Thus,
 * a cygwin user should define either PNG_BUILD_DLL or PNG_STATIC, and
 * this bit of #ifdefs will define the 'correct' config variables based on
 * that. If a cygwin user *wants* to define 'PNG_USE_DLL' that's okay, but
 * unnecessary.
 *
 * Also, the precedence order is:
 *   ALL_STATIC (since we can't #undef something outside our namespace)
 *   PNG_BUILD_DLL
 *   PNG_STATIC
 *   (nothing) == PNG_USE_DLL
 *
 * CYGWIN (2002-01-20): The preceding is now obsolete. With the advent
 *   of auto-import in binutils, we no longer need to worry about
 *   __declspec(dllexport) / __declspec(dllimport) and friends.  Therefore,
 *   we don't need to worry about PNG_STATIC or ALL_STATIC when it comes
 *   to __declspec() stuff.  However, we DO need to worry about
 *   PNG_BUILD_DLL and PNG_STATIC because those change some defaults
 *   such as CONSOLE_IO.
 */
#ifdef __CYGWIN__
#  ifdef ALL_STATIC
#    ifdef PNG_BUILD_DLL
#      undef PNG_BUILD_DLL
#    endif
#    ifdef PNG_USE_DLL
#      undef PNG_USE_DLL
#    endif
#    ifdef PNG_DLL
#      undef PNG_DLL
#    endif
#    ifndef PNG_STATIC
#      define PNG_STATIC
#    endif
#  else
#    ifdef PNG_BUILD_DLL
#      ifdef PNG_STATIC
#        undef PNG_STATIC
#      endif
#      ifdef PNG_USE_DLL
#        undef PNG_USE_DLL
#      endif
#      ifndef PNG_DLL
#        define PNG_DLL
#      endif
#    else
#      ifdef PNG_STATIC
#        ifdef PNG_USE_DLL
#          undef PNG_USE_DLL
#        endif
#        ifdef PNG_DLL
#          undef PNG_DLL
#        endif
#      else
#        ifndef PNG_USE_DLL
#          define PNG_USE_DLL
#        endif
#        ifndef PNG_DLL
#          define PNG_DLL
#        endif
#      endif
#    endif
#  endif
#endif

/* This protects us against compilers that run on a windowing system
 * and thus don't have or would rather us not use the stdio types:
 * stdin, stdout, and stderr.  The only one currently used is stderr
 * in png_error() and png_warning().  #defining PNG_NO_CONSOLE_IO will
 * prevent these from being compiled and used. #defining PNG_NO_STDIO
 * will also prevent these, plus will prevent the entire set of stdio
 * macros and functions (FILE *, printf, etc.) from being compiled and used,
 * unless (PNG_DEBUG > 0) has been #defined.
 *
 * #define PNG_NO_CONSOLE_IO
 * #define PNG_NO_STDIO
 */

#ifdef _WIN32_WCE
#  define PNG_NO_CONSOLE_IO
#  define PNG_NO_STDIO
#  define PNG_NO_TIME_RFC1123
#  ifdef PNG_DEBUG
#    undef PNG_DEBUG
#  endif
#endif

#if !defined(PNG_NO_STDIO) && !defined(PNG_STDIO_SUPPORTED)
#  define PNG_STDIO_SUPPORTED
#endif

#ifdef PNG_BUILD_DLL
#  if !defined(PNG_CONSOLE_IO_SUPPORTED) && !defined(PNG_NO_CONSOLE_IO)
#    define PNG_NO_CONSOLE_IO
#  endif
#endif

#  ifdef PNG_NO_STDIO
#    ifndef PNG_NO_CONSOLE_IO
#      define PNG_NO_CONSOLE_IO
#    endif
#    ifdef PNG_DEBUG
#      if (PNG_DEBUG > 0)
#        include <stdio.h>
#      endif
#    endif
#  else
#    include <stdio.h>
#  endif

#if !(defined PNG_NO_CONSOLE_IO) && !defined(PNG_CONSOLE_IO_SUPPORTED)
#  define PNG_CONSOLE_IO_SUPPORTED
#endif

/* This macro protects us against machines that don't have function
 * prototypes (ie K&R style headers).  If your compiler does not handle
 * function prototypes, define this macro and use the included ansi2knr.
 * I've always been able to use _NO_PROTO as the indicator, but you may
 * need to drag the empty declaration out in front of here, or change the
 * ifdef to suit your own needs.
 */
#ifndef PNGARG

#ifdef OF /* zlib prototype munger */
#  define PNGARG(arglist) OF(arglist)
#else

#ifdef _NO_PROTO
#  define PNGARG(arglist) ()
#else
#  define PNGARG(arglist) arglist
#endif /* _NO_PROTO */

#endif /* OF */

#endif /* PNGARG */

/* Try to determine if we are compiling on a Mac.  Note that testing for
 * 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(TARGET_OS_MAC)
#    define MACOS
#  endif
#endif

/* Enough people need this for various reasons to include it here */
#if !defined(MACOS) && !defined(RISCOS)
#  include <sys/types.h>
#endif

/* PNG_SETJMP_NOT_SUPPORTED and PNG_NO_SETJMP_SUPPORTED are deprecated. */
#if !defined(PNG_NO_SETJMP) && \
    !defined(PNG_SETJMP_NOT_SUPPORTED) && !defined(PNG_NO_SETJMP_SUPPORTED)
#  define PNG_SETJMP_SUPPORTED
#endif

#ifdef PNG_SETJMP_SUPPORTED
/* This is an attempt to force a single setjmp behaviour on Linux.  If
 * the X config stuff didn't define _BSD_SOURCE we wouldn't need this.
 *
 * You can bypass this test if you know that your application uses exactly
 * the same setjmp.h that was included when libpng was built.  Only define
 * PNG_SKIP_SETJMP_CHECK while building your application, prior to the
 * application's '#include "png.h"'. Don't define PNG_SKIP_SETJMP_CHECK
 * while building a separate libpng library for general use.
 */

#  ifndef PNG_SKIP_SETJMP_CHECK
#    ifdef __linux__
#      ifdef _BSD_SOURCE
#        define PNG_SAVE_BSD_SOURCE
#        undef _BSD_SOURCE
#      endif
#      ifdef _SETJMP_H
       /* If you encounter a compiler error here, see the explanation
        * near the end of INSTALL.
        */
           __pngconf.h__ in libpng already includes setjmp.h;
           __dont__ include it again.;
#      endif
#    endif /* __linux__ */
#  endif /* PNG_SKIP_SETJMP_CHECK */

   /* Include setjmp.h for error handling */
#  include <setjmp.h>

#  ifdef __linux__
#    ifdef PNG_SAVE_BSD_SOURCE
#      ifdef _BSD_SOURCE
#        undef _BSD_SOURCE
#      endif
#      define _BSD_SOURCE
#      undef PNG_SAVE_BSD_SOURCE
#    endif
#  endif /* __linux__ */
#endif /* PNG_SETJMP_SUPPORTED */

#ifdef BSD
#  include <strings.h>
#else
#  include <string.h>
#endif

/* Other defines for things like memory and the like can go here.  */

/* This controls how fine the quantizing gets.  As this allocates
 * a largish chunk of memory (32K), those who are not as concerned
 * with quantizing quality can decrease some or all of these.
 */

/* Prior to libpng-1.4.2, these were PNG_DITHER_*_BITS
 * These migration aids will be removed from libpng-1.5.0.
 */
#ifdef PNG_DITHER_RED_BITS
#  define PNG_QUANTIZE_RED_BITS PNG_DITHER_RED_BITS
#endif
#ifdef PNG_DITHER_GREEN_BITS
#  define PNG_QUANTIZE_GREEN_BITS PNG_DITHER_GREEN_BITS
#endif
#ifdef PNG_DITHER_BLUE_BITS
#  define PNG_QUANTIZE_BLUE_BITS PNG_DITHER_BLUE_BITS
#endif

#ifndef PNG_QUANTIZE_RED_BITS
#  define PNG_QUANTIZE_RED_BITS 5
#endif
#ifndef PNG_QUANTIZE_GREEN_BITS
#  define PNG_QUANTIZE_GREEN_BITS 5
#endif
#ifndef PNG_QUANTIZE_BLUE_BITS
#  define PNG_QUANTIZE_BLUE_BITS 5
#endif

/* This controls how fine the gamma correction becomes when you
 * are only interested in 8 bits anyway.  Increasing this value
 * results in more memory being used, and more pow() functions
 * being called to fill in the gamma tables.  Don't set this value
 * 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

/* The following uses const char * instead of char * for error
 * and warning message functions, so some compilers won't complain.
 * If you do not want to use const, define PNG_NO_CONST.
 */

#ifndef PNG_CONST
#  ifndef PNG_NO_CONST
#    define PNG_CONST const
#  else
#    define PNG_CONST
#  endif
#endif

/* The following defines give you the ability to remove code from the
 * library that you will not be using.  I wish I could figure out how to
 * automate this, but I can't do that without making it seriously hard
 * on the users.  So if you are not using an ability, change the #define
 * to an #undef, or pass in PNG_NO_feature and that part of the library
 * will not be compiled.

 * If your linker can't find a function, you may want to make sure the
 * ability is defined here.  Some of these depend upon some others being
 * defined.  I haven't figured out all the interactions here, so you may
 * have to experiment awhile to get everything to compile.  If you are
 * creating or using a shared library, you probably shouldn't touch this,
 * as it will affect the size of the structures, and this will cause bad
 * things to happen if the library and/or application ever change.
 */

/* Any features you will not be using can be undef'ed here */

/* GR-P, 0.96a: Set "*TRANSFORMS_SUPPORTED as default but allow user
 * to turn it off with PNG_NO_READ|WRITE_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 PNG_NO_READ|WRITE_TRANSFORMS
 * 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; PNG_*_TRANSFORMS_NOT_SUPPORTED deprecated in
 * 1.4.0)
 */

/* Ignore attempt to turn off both floating and fixed point support */
#if !defined(PNG_FLOATING_POINT_SUPPORTED) || \
    !defined(PNG_NO_FIXED_POINT_SUPPORTED)
#  define PNG_FIXED_POINT_SUPPORTED
#endif

#ifdef PNG_READ_SUPPORTED

/* PNG_READ_TRANSFORMS_NOT_SUPPORTED is deprecated. */
#if !defined(PNG_READ_TRANSFORMS_NOT_SUPPORTED) && \
      !defined(PNG_NO_READ_TRANSFORMS)
#  define PNG_READ_TRANSFORMS_SUPPORTED
#endif

#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_QUANTIZE
     /* Prior to libpng-1.4.0 this was PNG_READ_DITHER_SUPPORTED */
#    ifndef PNG_NO_READ_DITHER  /* This migration aid will be removed */
#      define PNG_READ_QUANTIZE_SUPPORTED
#    endif
#  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
#  endif
#  ifndef PNG_NO_READ_USER_TRANSFORM
#    define PNG_READ_USER_TRANSFORM_SUPPORTED
#  endif
#  ifndef PNG_NO_READ_RGB_TO_GRAY
#    define PNG_READ_RGB_TO_GRAY_SUPPORTED
#  endif
#endif /* PNG_READ_TRANSFORMS_SUPPORTED */

/* PNG_PROGRESSIVE_READ_NOT_SUPPORTED is deprecated. */
#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 define: */

#define PNG_READ_INTERLACING_SUPPORTED /* required for PNG-compliant decoders */

/* PNG_NO_SEQUENTIAL_READ_SUPPORTED is deprecated. */
#if !defined(PNG_NO_SEQUENTIAL_READ) && \
    !defined(PNG_SEQUENTIAL_READ_SUPPORTED) && \
    !defined(PNG_NO_SEQUENTIAL_READ_SUPPORTED)
#  define PNG_SEQUENTIAL_READ_SUPPORTED
#endif

#ifndef PNG_NO_READ_COMPOSITE_NODIV
#  ifndef PNG_NO_READ_COMPOSITED_NODIV  /* libpng-1.0.x misspelling */
#    define PNG_READ_COMPOSITE_NODIV_SUPPORTED   /* well tested on Intel, SGI */
#  endif
#endif

#if !defined(PNG_NO_GET_INT_32) || defined(PNG_READ_oFFS_SUPPORTED) || \
    defined(PNG_READ_pCAL_SUPPORTED)
#  ifndef PNG_GET_INT_32_SUPPORTED
#    define PNG_GET_INT_32_SUPPORTED
#  endif
#endif

#endif /* PNG_READ_SUPPORTED */

#ifdef PNG_WRITE_SUPPORTED

/* PNG_WRITE_TRANSFORMS_NOT_SUPPORTED is deprecated. */
#if !defined(PNG_WRITE_TRANSFORMS_NOT_SUPPORTED) && \
    !defined(PNG_NO_WRITE_TRANSFORMS)
#  define PNG_WRITE_TRANSFORMS_SUPPORTED
#endif

#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   /* 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 */

#if !defined(PNG_NO_WRITE_INTERLACING_SUPPORTED) && \
    !defined(PNG_WRITE_INTERLACING_SUPPORTED)
    /* This is not required for PNG-compliant encoders, but can cause
     * trouble if left undefined
    */
#  define PNG_WRITE_INTERLACING_SUPPORTED
#endif

#if !defined(PNG_NO_WRITE_WEIGHTED_FILTER) && \
    !defined(PNG_WRITE_WEIGHTED_FILTER) && \
     defined(PNG_FLOATING_POINT_SUPPORTED)
#  define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
#endif

#ifndef PNG_NO_WRITE_FLUSH
#  define PNG_WRITE_FLUSH_SUPPORTED
#endif

#if !defined(PNG_NO_SAVE_INT_32) || defined(PNG_WRITE_oFFS_SUPPORTED) || \
    defined(PNG_WRITE_pCAL_SUPPORTED)
#  ifndef PNG_SAVE_INT_32_SUPPORTED
#    define PNG_SAVE_INT_32_SUPPORTED
#  endif
#endif

#endif /* PNG_WRITE_SUPPORTED */

#define PNG_NO_ERROR_NUMBERS

#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
#  ifndef PNG_NO_USER_TRANSFORM_PTR
#    define PNG_USER_TRANSFORM_PTR_SUPPORTED
#  endif
#endif

#if defined(PNG_STDIO_SUPPORTED) && !defined(PNG_TIME_RFC1123_SUPPORTED)
#  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()
 */
#if !defined(PNG_NO_EASY_ACCESS) && !defined(PNG_EASY_ACCESS_SUPPORTED)
#  define PNG_EASY_ACCESS_SUPPORTED
#endif

/* Added at libpng-1.2.0 */
#if !defined(PNG_NO_USER_MEM) && !defined(PNG_USER_MEM_SUPPORTED)
#  define PNG_USER_MEM_SUPPORTED
#endif

/* Added at libpng-1.2.6 */
#ifndef PNG_NO_SET_USER_LIMITS
#  ifndef PNG_SET_USER_LIMITS_SUPPORTED
#    define PNG_SET_USER_LIMITS_SUPPORTED
#  endif
  /* Feature added at libpng-1.4.0, this flag added at 1.4.1 */
#  ifndef PNG_SET_CHUNK_CACHE_LIMIT_SUPPORTED
#    define PNG_SET_CHUNK_CACHE_LIMIT_SUPPORTED
#  endif
  /* Feature added at libpng-1.4.1, this flag added at 1.4.1 */
#  ifndef PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED
#    define PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED
#  endif
#endif

/* Added at libpng-1.2.43 */
#ifndef PNG_USER_LIMITS_SUPPORTED
#  ifndef PNG_NO_USER_LIMITS
#    define PNG_USER_LIMITS_SUPPORTED
#  endif
#endif

/* Added at libpng-1.0.16 and 1.2.6.  To accept all valid PNGs no matter
 * how large, set these two limits to 0x7fffffffL
 */
#ifndef PNG_USER_WIDTH_MAX
#  define PNG_USER_WIDTH_MAX 1000000L
#endif
#ifndef PNG_USER_HEIGHT_MAX
#  define PNG_USER_HEIGHT_MAX 1000000L
#endif

/* Added at libpng-1.2.43.  To accept all valid PNGs no matter
 * how large, set these two limits to 0.
 */
#ifndef PNG_USER_CHUNK_CACHE_MAX
#  define PNG_USER_CHUNK_CACHE_MAX 0
#endif

/* Added at libpng-1.2.43 */
#ifndef PNG_USER_CHUNK_MALLOC_MAX
#  define PNG_USER_CHUNK_MALLOC_MAX 0
#endif

/* Added at libpng-1.4.0 */
#if !defined(PNG_NO_IO_STATE) && !defined(PNG_IO_STATE_SUPPORTED)
#  define PNG_IO_STATE_SUPPORTED
#endif

#ifndef PNG_LITERAL_SHARP
#  define PNG_LITERAL_SHARP 0x23
#endif
#ifndef PNG_LITERAL_LEFT_SQUARE_BRACKET
#  define PNG_LITERAL_LEFT_SQUARE_BRACKET 0x5b
#endif
#ifndef PNG_LITERAL_RIGHT_SQUARE_BRACKET
#  define PNG_LITERAL_RIGHT_SQUARE_BRACKET 0x5d
#endif
#ifndef PNG_STRING_NEWLINE
#define PNG_STRING_NEWLINE "\n"
#endif

/* These are currently experimental features, define them if you want */

/* Very little testing */
/*
#ifdef PNG_READ_SUPPORTED
#  ifndef PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
#    define PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
#  endif
#endif
*/

/* This is only for PowerPC big-endian and 680x0 systems */
/* some testing */
/*
#ifndef PNG_READ_BIG_ENDIAN_SUPPORTED
#  define PNG_READ_BIG_ENDIAN_SUPPORTED
#endif
*/

#if !defined(PNG_NO_USE_READ_MACROS) && !defined(PNG_USE_READ_MACROS)
#  define PNG_USE_READ_MACROS
#endif

/* Buggy compilers (e.g., gcc 2.7.2.2) need PNG_NO_POINTER_INDEXING */

#if !defined(PNG_NO_POINTER_INDEXING) && \
    !defined(PNG_POINTER_INDEXING_SUPPORTED)
#  define PNG_POINTER_INDEXING_SUPPORTED
#endif

/* 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.
 */

/* The size of the png_text structure changed in libpng-1.0.6 when
 * iTXt support was added.  iTXt support was turned off by default through
 * libpng-1.2.x, to support old apps that malloc the png_text structure
 * instead of calling png_set_text() and letting libpng malloc it.  It
 * was turned on by default in libpng-1.4.0.
 */

/* PNG_READ_ANCILLARY_CHUNKS_NOT_SUPPORTED is deprecated. */
#if defined(PNG_READ_SUPPORTED) && \
    !defined(PNG_READ_ANCILLARY_CHUNKS_NOT_SUPPORTED) && \
    !defined(PNG_NO_READ_ANCILLARY_CHUNKS)
#  define PNG_READ_ANCILLARY_CHUNKS_SUPPORTED
#endif

/* PNG_WRITE_ANCILLARY_CHUNKS_NOT_SUPPORTED is deprecated. */
#if defined(PNG_WRITE_SUPPORTED) && \
    !defined(PNG_WRITE_ANCILLARY_CHUNKS_NOT_SUPPORTED) && \
    !defined(PNG_NO_WRITE_ANCILLARY_CHUNKS)
#  define PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
#endif

#ifdef PNG_READ_ANCILLARY_CHUNKS_SUPPORTED

#ifdef PNG_NO_READ_TEXT
#  define PNG_NO_READ_iTXt
#  define PNG_NO_READ_tEXt
#  define PNG_NO_READ_zTXt
#endif

#ifndef PNG_NO_READ_bKGD
#  define PNG_READ_bKGD_SUPPORTED
#  define PNG_bKGD_SUPPORTED
#endif
#ifndef PNG_NO_READ_cHRM
#  define PNG_READ_cHRM_SUPPORTED
#  define PNG_cHRM_SUPPORTED
#endif
#ifndef PNG_NO_READ_gAMA
#  define PNG_READ_gAMA_SUPPORTED
#  define PNG_gAMA_SUPPORTED
#endif
#ifndef PNG_NO_READ_hIST
#  define PNG_READ_hIST_SUPPORTED
#  define PNG_hIST_SUPPORTED
#endif
#ifndef PNG_NO_READ_iCCP
#  define PNG_READ_iCCP_SUPPORTED
#  define PNG_iCCP_SUPPORTED
#endif
#ifndef PNG_NO_READ_iTXt
#  ifndef PNG_READ_iTXt_SUPPORTED
#    define PNG_READ_iTXt_SUPPORTED
#  endif
#  ifndef PNG_iTXt_SUPPORTED
#    define PNG_iTXt_SUPPORTED
#  endif
#endif
#ifndef PNG_NO_READ_oFFs
#  define PNG_READ_oFFs_SUPPORTED
#  define PNG_oFFs_SUPPORTED
#endif
#ifndef PNG_NO_READ_pCAL
#  define PNG_READ_pCAL_SUPPORTED
#  define PNG_pCAL_SUPPORTED
#endif
#ifndef PNG_NO_READ_sCAL
#  define PNG_READ_sCAL_SUPPORTED
#  define PNG_sCAL_SUPPORTED
#endif
#ifndef PNG_NO_READ_pHYs
#  define PNG_READ_pHYs_SUPPORTED
#  define PNG_pHYs_SUPPORTED
#endif
#ifndef PNG_NO_READ_sBIT
#  define PNG_READ_sBIT_SUPPORTED
#  define PNG_sBIT_SUPPORTED
#endif
#ifndef PNG_NO_READ_sPLT
#  define PNG_READ_sPLT_SUPPORTED
#  define PNG_sPLT_SUPPORTED
#endif
#ifndef PNG_NO_READ_sRGB
#  define PNG_READ_sRGB_SUPPORTED
#  define PNG_sRGB_SUPPORTED
#endif
#ifndef PNG_NO_READ_tEXt
#  define PNG_READ_tEXt_SUPPORTED
#  define PNG_tEXt_SUPPORTED
#endif
#ifndef PNG_NO_READ_tIME
#  define PNG_READ_tIME_SUPPORTED
#  define PNG_tIME_SUPPORTED
#endif
#ifndef PNG_NO_READ_tRNS
#  define PNG_READ_tRNS_SUPPORTED
#  define PNG_tRNS_SUPPORTED
#endif
#ifndef PNG_NO_READ_zTXt
#  define PNG_READ_zTXt_SUPPORTED
#  define PNG_zTXt_SUPPORTED
#endif
#ifndef PNG_NO_READ_OPT_PLTE
#  define PNG_READ_OPT_PLTE_SUPPORTED /* only affects support of the */
#endif                      /* optional PLTE chunk in RGB and RGBA images */
#if defined(PNG_READ_iTXt_SUPPORTED) || defined(PNG_READ_tEXt_SUPPORTED) || \
    defined(PNG_READ_zTXt_SUPPORTED)
#  define PNG_READ_TEXT_SUPPORTED
#  define PNG_TEXT_SUPPORTED
#endif

#endif /* PNG_READ_ANCILLARY_CHUNKS_SUPPORTED */

#ifndef PNG_NO_READ_UNKNOWN_CHUNKS
#  ifndef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
#    define PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
#  endif
#  ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
#    define PNG_UNKNOWN_CHUNKS_SUPPORTED
#  endif
#  ifndef PNG_READ_USER_CHUNKS_SUPPORTED
#    define PNG_READ_USER_CHUNKS_SUPPORTED
#  endif
#endif
#ifndef PNG_NO_READ_USER_CHUNKS
#  ifndef PNG_READ_USER_CHUNKS_SUPPORTED
#    define PNG_READ_USER_CHUNKS_SUPPORTED
#  endif
#  ifndef PNG_USER_CHUNKS_SUPPORTED
#    define PNG_USER_CHUNKS_SUPPORTED
#  endif
#endif
#ifndef PNG_NO_HANDLE_AS_UNKNOWN
#  ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
#    define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
#  endif
#endif

#ifdef PNG_WRITE_SUPPORTED
#ifdef PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED

#ifdef PNG_NO_WRITE_TEXT
#  define PNG_NO_WRITE_iTXt
#  define PNG_NO_WRITE_tEXt
#  define PNG_NO_WRITE_zTXt
#endif
#ifndef PNG_NO_WRITE_bKGD
#  define PNG_WRITE_bKGD_SUPPORTED
#  ifndef PNG_bKGD_SUPPORTED
#    define PNG_bKGD_SUPPORTED
#  endif
#endif
#ifndef PNG_NO_WRITE_cHRM
#  define PNG_WRITE_cHRM_SUPPORTED
#  ifndef PNG_cHRM_SUPPORTED
#    define PNG_cHRM_SUPPORTED
#  endif
#endif
#ifndef PNG_NO_WRITE_gAMA
#  define PNG_WRITE_gAMA_SUPPORTED
#  ifndef PNG_gAMA_SUPPORTED
#    define PNG_gAMA_SUPPORTED
#  endif
#endif
#ifndef PNG_NO_WRITE_hIST
#  define PNG_WRITE_hIST_SUPPORTED
#  ifndef PNG_hIST_SUPPORTED
#    define PNG_hIST_SUPPORTED
#  endif
#endif
#ifndef PNG_NO_WRITE_iCCP
#  define PNG_WRITE_iCCP_SUPPORTED
#  ifndef PNG_iCCP_SUPPORTED
#    define PNG_iCCP_SUPPORTED
#  endif
#endif
#ifndef PNG_NO_WRITE_iTXt
#  ifndef PNG_WRITE_iTXt_SUPPORTED
#    define PNG_WRITE_iTXt_SUPPORTED
#  endif
#  ifndef PNG_iTXt_SUPPORTED
#    define PNG_iTXt_SUPPORTED
#  endif
#endif
#ifndef PNG_NO_WRITE_oFFs
#  define PNG_WRITE_oFFs_SUPPORTED
#  ifndef PNG_oFFs_SUPPORTED
#    define PNG_oFFs_SUPPORTED
#  endif
#endif
#ifndef PNG_NO_WRITE_pCAL
#  define PNG_WRITE_pCAL_SUPPORTED
#  ifndef PNG_pCAL_SUPPORTED
#    define PNG_pCAL_SUPPORTED
#  endif
#endif
#ifndef PNG_NO_WRITE_sCAL
#  define PNG_WRITE_sCAL_SUPPORTED
#  ifndef PNG_sCAL_SUPPORTED
#    define PNG_sCAL_SUPPORTED
#  endif
#endif
#ifndef PNG_NO_WRITE_pHYs
#  define PNG_WRITE_pHYs_SUPPORTED
#  ifndef PNG_pHYs_SUPPORTED
#    define PNG_pHYs_SUPPORTED
#  endif
#endif
#ifndef PNG_NO_WRITE_sBIT
#  define PNG_WRITE_sBIT_SUPPORTED
#  ifndef PNG_sBIT_SUPPORTED
#    define PNG_sBIT_SUPPORTED
#  endif
#endif
#ifndef PNG_NO_WRITE_sPLT
#  define PNG_WRITE_sPLT_SUPPORTED
#  ifndef PNG_sPLT_SUPPORTED
#    define PNG_sPLT_SUPPORTED
#  endif
#endif
#ifndef PNG_NO_WRITE_sRGB
#  define PNG_WRITE_sRGB_SUPPORTED
#  ifndef PNG_sRGB_SUPPORTED
#    define PNG_sRGB_SUPPORTED
#  endif
#endif
#ifndef PNG_NO_WRITE_tEXt
#  define PNG_WRITE_tEXt_SUPPORTED
#  ifndef PNG_tEXt_SUPPORTED
#    define PNG_tEXt_SUPPORTED
#  endif
#endif
#ifndef PNG_NO_WRITE_tIME
#  define PNG_WRITE_tIME_SUPPORTED
#  ifndef PNG_tIME_SUPPORTED
#    define PNG_tIME_SUPPORTED
#  endif
#endif
#ifndef PNG_NO_WRITE_tRNS
#  define PNG_WRITE_tRNS_SUPPORTED
#  ifndef PNG_tRNS_SUPPORTED
#    define PNG_tRNS_SUPPORTED
#  endif
#endif
#ifndef PNG_NO_WRITE_zTXt
#  define PNG_WRITE_zTXt_SUPPORTED
#  ifndef PNG_zTXt_SUPPORTED
#    define PNG_zTXt_SUPPORTED
#  endif
#endif
#if defined(PNG_WRITE_iTXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \
    defined(PNG_WRITE_zTXt_SUPPORTED)
#  define PNG_WRITE_TEXT_SUPPORTED
#  ifndef PNG_TEXT_SUPPORTED
#    define PNG_TEXT_SUPPORTED
#  endif
#endif

#ifdef PNG_WRITE_tIME_SUPPORTED
#  ifndef PNG_NO_CONVERT_tIME
#    ifndef _WIN32_WCE
/*   The "tm" structure is not supported on WindowsCE */
#      ifndef PNG_CONVERT_tIME_SUPPORTED
#        define PNG_CONVERT_tIME_SUPPORTED
#      endif
#   endif
#  endif
#endif

#endif /* PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED */

#ifndef PNG_NO_WRITE_FILTER
#  ifndef PNG_WRITE_FILTER_SUPPORTED
#    define PNG_WRITE_FILTER_SUPPORTED
#  endif
#endif

#ifndef PNG_NO_WRITE_UNKNOWN_CHUNKS
#  define PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
#  ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
#    define PNG_UNKNOWN_CHUNKS_SUPPORTED
#  endif
#endif
#ifndef PNG_NO_HANDLE_AS_UNKNOWN
#  ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
#    define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
#  endif
#endif
#endif /* PNG_WRITE_SUPPORTED */

/* Turn this off to disable png_read_png() and
 * png_write_png() and leave the row_pointers member
 * out of the info structure.
 */
#ifndef PNG_NO_INFO_IMAGE
#  define PNG_INFO_IMAGE_SUPPORTED
#endif

/* Need the time information for converting tIME chunks */
#ifdef PNG_CONVERT_tIME_SUPPORTED
     /* "time.h" functions are not supported on WindowsCE */
#    include <time.h>
#endif

/* Some typedefs to get us started.  These should be safe on most of the
 * common platforms.  The typedefs should be at least as large as the
 * numbers suggest (a png_uint_32 must be at least 32 bits long), but they
 * don't have to be exactly that size.  Some compilers dislike passing
 * unsigned shorts as function parameters, so you may be better off using
 * unsigned int for png_uint_16.
 */

#if defined(INT_MAX) && (INT_MAX > 0x7ffffffeL)
typedef unsigned int png_uint_32;
typedef int png_int_32;
#else
typedef unsigned long png_uint_32;
typedef long png_int_32;
#endif
typedef unsigned short png_uint_16;
typedef short png_int_16;
typedef unsigned char png_byte;

#ifdef PNG_NO_SIZE_T
   typedef unsigned int png_size_t;
#else
   typedef size_t png_size_t;
#endif
#define png_sizeof(x) (sizeof (x))

/* The following is needed for medium model support.  It cannot be in the
 * pngpriv.h header.  Needs modification for other compilers besides
 * MSC.  Model independent support declares all arrays and pointers to be
 * large using the far keyword.  The zlib version used must also support
 * model independent data.  As of version zlib 1.0.4, the necessary changes
 * have been made in zlib.  The USE_FAR_KEYWORD define triggers other
 * changes that are needed. (Tim Wegner)
 */

/* Separate compiler dependencies (problem here is that zlib.h always
 * defines FAR. (SJT)
 */
#ifdef __BORLANDC__
#  if defined(__LARGE__) || defined(__HUGE__) || defined(__COMPACT__)
#    define LDATA 1
#  else
#    define LDATA 0
#  endif
   /* GRR:  why is Cygwin in here?  Cygwin is not Borland C... */
#  if !defined(__WIN32__) && !defined(__FLAT__) && !defined(__CYGWIN__)
#    define PNG_MAX_MALLOC_64K
#    if (LDATA != 1)
#      ifndef FAR
#        define FAR __far
#      endif
#      define USE_FAR_KEYWORD
#    endif   /* LDATA != 1 */
     /* Possibly useful for moving data out of default segment.
      * Uncomment it if you want. Could also define FARDATA as
      * const if your compiler supports it. (SJT)
#    define FARDATA FAR
      */
#  endif  /* __WIN32__, __FLAT__, __CYGWIN__ */
#endif   /* __BORLANDC__ */

/* Suggest testing for specific compiler first before testing for
 * FAR.  The Watcom compiler defines both __MEDIUM__ and M_I86MM,
 * making reliance oncertain keywords suspect. (SJT)
 */

/* MSC Medium model */
#ifdef FAR
#  ifdef M_I86MM
#    define USE_FAR_KEYWORD
#    define FARDATA FAR
#    include <dos.h>
#  endif
#endif

/* SJT: default case */
#ifndef FAR
#  define FAR
#endif

/* At this point FAR is always defined */
#ifndef FARDATA
#  define FARDATA
#endif

/* Typedef for floating-point numbers that are converted
   to fixed-point with a multiple of 100,000, e.g., int_gamma */
typedef png_int_32 png_fixed_point;

/* Add typedefs for pointers */
typedef void            FAR * png_voidp;
typedef png_byte        FAR * png_bytep;
typedef png_uint_32     FAR * png_uint_32p;
typedef png_int_32      FAR * png_int_32p;
typedef png_uint_16     FAR * png_uint_16p;
typedef png_int_16      FAR * png_int_16p;
typedef PNG_CONST char  FAR * png_const_charp;
typedef char            FAR * png_charp;
typedef png_fixed_point FAR * png_fixed_point_p;

#ifndef PNG_NO_STDIO
typedef FILE                * png_FILE_p;
#endif

#ifdef PNG_FLOATING_POINT_SUPPORTED
typedef double          FAR * png_doublep;
#endif

/* Pointers to pointers; i.e. arrays */
typedef png_byte        FAR * FAR * png_bytepp;
typedef png_uint_32     FAR * FAR * png_uint_32pp;
typedef png_int_32      FAR * FAR * png_int_32pp;
typedef png_uint_16     FAR * FAR * png_uint_16pp;
typedef png_int_16      FAR * FAR * png_int_16pp;
typedef PNG_CONST char  FAR * FAR * png_const_charpp;
typedef char            FAR * FAR * png_charpp;
typedef png_fixed_point FAR * FAR * png_fixed_point_pp;
#ifdef PNG_FLOATING_POINT_SUPPORTED
typedef double          FAR * FAR * png_doublepp;
#endif

/* Pointers to pointers to pointers; i.e., pointer to array */
typedef char            FAR * FAR * FAR * png_charppp;

/* Define PNG_BUILD_DLL if the module being built is a Windows
 * LIBPNG DLL.
 *
 * Define PNG_USE_DLL if you want to *link* to the Windows LIBPNG DLL.
 * It is equivalent to Microsoft predefined macro _DLL that is
 * automatically defined when you compile using the share
 * version of the CRT (C Run-Time library)
 *
 * The cygwin mods make this behavior a little different:
 * Define PNG_BUILD_DLL if you are building a dll for use with cygwin
 * Define PNG_STATIC if you are building a static library for use with cygwin,
 *   -or- if you are building an application that you want to link to the
 *   static library.
 * PNG_USE_DLL is defined by default (no user action needed) unless one of
 *   the other flags is defined.
 */

#if !defined(PNG_DLL) && (defined(PNG_BUILD_DLL) || defined(PNG_USE_DLL))
#  define PNG_DLL
#endif

/* If you define PNGAPI, e.g., with compiler option "-DPNGAPI=__stdcall",
 * you may get warnings regarding the linkage of png_zalloc and png_zfree.
 * Don't ignore those warnings; you must also reset the default calling
 * convention in your compiler to match your PNGAPI, and you must build
 * zlib and your applications the same way you build libpng.
 */

#ifdef __CYGWIN__
#  undef PNGAPI
#  define PNGAPI __cdecl
#  undef PNG_IMPEXP
#  define PNG_IMPEXP
#endif

#ifdef __WATCOMC__
#  ifndef PNGAPI
#    define PNGAPI
#  endif
#endif

#if defined(__MINGW32__) && !defined(PNG_MODULEDEF)
#  ifndef PNG_NO_MODULEDEF
#    define PNG_NO_MODULEDEF
#  endif
#endif

#if !defined(PNG_IMPEXP) && defined(PNG_BUILD_DLL) && !defined(PNG_NO_MODULEDEF)
#  define PNG_IMPEXP
#endif

#if defined(PNG_DLL) || defined(_DLL) || defined(__DLL__ ) || \
    (( defined(_Windows) || defined(_WINDOWS) || \
       defined(WIN32) || defined(_WIN32) || defined(__WIN32__) ))

#  ifndef PNGAPI
#     if defined(__GNUC__) || (defined (_MSC_VER) && (_MSC_VER >= 800))
#        define PNGAPI __cdecl
#     else
#        define PNGAPI _cdecl
#     endif
#  endif

#  if !defined(PNG_IMPEXP) && (!defined(PNG_DLL) || \
       0 /* WINCOMPILER_WITH_NO_SUPPORT_FOR_DECLIMPEXP */)
#     define PNG_IMPEXP
#  endif

#  ifndef PNG_IMPEXP

#    define PNG_EXPORT_TYPE1(type,symbol)  PNG_IMPEXP type PNGAPI symbol
#    define PNG_EXPORT_TYPE2(type,symbol)  type PNG_IMPEXP PNGAPI symbol

     /* Borland/Microsoft */
#    if defined(_MSC_VER) || defined(__BORLANDC__)
#      if (_MSC_VER >= 800) || (__BORLANDC__ >= 0x500)
#         define PNG_EXPORT PNG_EXPORT_TYPE1
#      else
#         define PNG_EXPORT PNG_EXPORT_TYPE2
#         ifdef PNG_BUILD_DLL
#            define PNG_IMPEXP __export
#         else
#            define PNG_IMPEXP /*__import */ /* doesn't exist AFAIK in VC++ */
#         endif                              /* Exists in Borland C++ for
                                                C++ classes (== huge) */
#      endif
#    endif

#    ifndef PNG_IMPEXP
#      ifdef PNG_BUILD_DLL
#        define PNG_IMPEXP __declspec(dllexport)
#      else
#        define PNG_IMPEXP __declspec(dllimport)
#      endif
#    endif
#  endif  /* PNG_IMPEXP */
#else /* !(DLL || non-cygwin WINDOWS) */
#   if (defined(__IBMC__) || defined(__IBMCPP__)) && defined(__OS2__)
#     ifndef PNGAPI
#       define PNGAPI _System
#     endif
#   else
#     if 0 /* ... other platforms, with other meanings */
#     endif
#   endif
#endif

#ifndef PNGAPI
#  define PNGAPI
#endif
#ifndef PNG_IMPEXP
#  define PNG_IMPEXP
#endif

#ifdef PNG_BUILDSYMS
#  ifndef PNG_EXPORT
#    define PNG_EXPORT(type,symbol) PNG_FUNCTION_EXPORT symbol END
#  endif
#endif

#ifndef PNG_EXPORT
#  define PNG_EXPORT(type,symbol) PNG_IMPEXP type PNGAPI symbol
#endif

#define PNG_USE_LOCAL_ARRAYS /* Not used in libpng, defined for legacy apps */

/* Support for compiler specific function attributes.  These are used
 * so that where compiler support is available incorrect use of API
 * functions in png.h will generate compiler warnings.
 *
 * Added at libpng-1.2.41.
 */

#ifndef PNG_NO_PEDANTIC_WARNINGS
#  ifndef PNG_PEDANTIC_WARNINGS_SUPPORTED
#    define PNG_PEDANTIC_WARNINGS_SUPPORTED
#  endif
#endif

#ifdef PNG_PEDANTIC_WARNINGS_SUPPORTED
/* Support for compiler specific function attributes.  These are used
 * so that where compiler support is available incorrect use of API
 * functions in png.h will generate compiler warnings.  Added at libpng
 * version 1.2.41.
 */
#  ifdef __GNUC__
#    ifndef PNG_USE_RESULT
#      define PNG_USE_RESULT __attribute__((__warn_unused_result__))
#    endif
#    ifndef PNG_NORETURN
#      define PNG_NORETURN   __attribute__((__noreturn__))
#    endif
#    ifndef PNG_ALLOCATED
#      define PNG_ALLOCATED  __attribute__((__malloc__))
#    endif
#    ifndef PNG_DEPRECATED
#      define PNG_DEPRECATED __attribute__((__deprecated__))
#    endif

    /* This specifically protects structure members that should only be
     * accessed from within the library, therefore should be empty during
     * a library build.
     */
#    ifndef PNG_DEPSTRUCT
#      define PNG_DEPSTRUCT  __attribute__((__deprecated__))
#    endif
#    ifndef PNG_PRIVATE
#      if 0 /* Doesn't work so we use deprecated instead*/
#        define PNG_PRIVATE \
          __attribute__((warning("This function is not exported by libpng.")))
#      else
#        define PNG_PRIVATE \
          __attribute__((__deprecated__))
#      endif
#    endif /* PNG_PRIVATE */
#  endif /* __GNUC__ */
#endif /* PNG_PEDANTIC_WARNINGS */

#ifndef PNG_DEPRECATED
#  define PNG_DEPRECATED  /* Use of this function is deprecated */
#endif
#ifndef PNG_USE_RESULT
#  define PNG_USE_RESULT  /* The result of this function must be checked */
#endif
#ifndef PNG_NORETURN
#  define PNG_NORETURN    /* This function does not return */
#endif
#ifndef PNG_ALLOCATED
#  define PNG_ALLOCATED   /* The result of the function is new memory */
#endif
#ifndef PNG_DEPSTRUCT
#  define PNG_DEPSTRUCT   /* Access to this struct member is deprecated */
#endif
#ifndef PNG_PRIVATE
#  define PNG_PRIVATE     /* This is a private libpng function */
#endif

/* Users may want to use these so they are not private.  Any library
 * functions that are passed far data must be model-independent.
 */

/* memory model/platform independent fns */
#ifndef PNG_ABORT
#  if (defined(_Windows) || defined(_WINDOWS) || defined(_WINDOWS_))
#     define PNG_ABORT() ExitProcess(0)
#  else
#     define PNG_ABORT() abort()
#  endif
#endif

#ifdef USE_FAR_KEYWORD
/* Use this to make far-to-near assignments */
#  define CHECK   1
#  define NOCHECK 0
#  define CVT_PTR(ptr) (png_far_to_near(png_ptr,ptr,CHECK))
#  define CVT_PTR_NOCHECK(ptr) (png_far_to_near(png_ptr,ptr,NOCHECK))
#  define png_strcpy  _fstrcpy
#  define png_strncpy _fstrncpy   /* Added to v 1.2.6 */
#  define png_strlen  _fstrlen
#  define png_memcmp  _fmemcmp    /* SJT: added */
#  define png_memcpy  _fmemcpy
#  define png_memset  _fmemset
#  define png_sprintf sprintf
#else
#  if (defined(_Windows) || defined(_WINDOWS) || defined(_WINDOWS_))
#    /* Favor Windows over C runtime fns */
#    define CVT_PTR(ptr)         (ptr)
#    define CVT_PTR_NOCHECK(ptr) (ptr)
#    define png_strcpy  lstrcpyA
#    define png_strncpy lstrcpynA
#    define png_strlen  lstrlenA
#    define png_memcmp  memcmp
#    define png_memcpy  CopyMemory
#    define png_memset  memset
#    define png_sprintf wsprintfA
#  else
#    define CVT_PTR(ptr)         (ptr)
#    define CVT_PTR_NOCHECK(ptr) (ptr)
#    define png_strcpy  strcpy
#    define png_strncpy strncpy     /* Added to v 1.2.6 */
#    define png_strlen  strlen
#    define png_memcmp  memcmp      /* SJT: added */
#    define png_memcpy  memcpy
#    define png_memset  memset
#    define png_sprintf sprintf
#  endif
#endif

#ifndef PNG_NO_SNPRINTF
#  ifdef _MSC_VER
#    define png_snprintf _snprintf   /* Added to v 1.2.19 */
#    define png_snprintf2 _snprintf
#    define png_snprintf6 _snprintf
#  else
#    define png_snprintf snprintf   /* Added to v 1.2.19 */
#    define png_snprintf2 snprintf
#    define png_snprintf6 snprintf
#  endif
#else
   /* You don't have or don't want to use snprintf().  Caution: Using
    * sprintf instead of snprintf exposes your application to accidental
    * or malevolent buffer overflows.  If you don't have snprintf()
    * as a general rule you should provide one (you can get one from
    * Portable OpenSSH).
    */
#  define png_snprintf(s1,n,fmt,x1) png_sprintf(s1,fmt,x1)
#  define png_snprintf2(s1,n,fmt,x1,x2) png_sprintf(s1,fmt,x1,x2)
#  define png_snprintf6(s1,n,fmt,x1,x2,x3,x4,x5,x6) \
      png_sprintf(s1,fmt,x1,x2,x3,x4,x5,x6)
#endif

/* png_alloc_size_t is guaranteed to be no smaller than png_size_t,
 * and no smaller than png_uint_32.  Casts from png_size_t or png_uint_32
 * to png_alloc_size_t are not necessary; in fact, it is recommended
 * not to use them at all so that the compiler can complain when something
 * turns out to be problematic.
 * Casts in the other direction (from png_alloc_size_t to png_size_t or
 * png_uint_32) should be explicitly applied; however, we do not expect
 * to encounter practical situations that require such conversions.
 */
#if defined(__TURBOC__) && !defined(__FLAT__)
   typedef unsigned long png_alloc_size_t;
#else
#  if defined(_MSC_VER) && defined(MAXSEG_64K)
     typedef unsigned long    png_alloc_size_t;
#  else
     /* This is an attempt to detect an old Windows system where (int) is
      * actually 16 bits, in that case png_malloc must have an argument with a
      * bigger size to accomodate the requirements of the library.
      */
#    if (defined(_Windows) || defined(_WINDOWS) || defined(_WINDOWS_)) && \
        (!defined(INT_MAX) || INT_MAX <= 0x7ffffffeL)
       typedef DWORD         png_alloc_size_t;
#    else
       typedef png_size_t    png_alloc_size_t;
#    endif
#  endif
#endif
/* End of memory model/platform independent support */

/* Just a little check that someone hasn't tried to define something
 * contradictory.
 */
#if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K)
#  undef PNG_ZBUF_SIZE
#  define PNG_ZBUF_SIZE 65536L
#endif

/* Added at libpng-1.2.8 */
#endif /* PNG_VERSION_INFO_ONLY */

#endif /* PNGCONF_H */

license: mit


code:
/* pngpriv.h - private declarations for use inside libpng
 *
 * libpng version 1.4.8 - July 7, 2011
 * For conditions of distribution and use, see copyright notice in png.h
 * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
 * This code is released under the libpng license.
 * For conditions of distribution and use, see the disclaimer
 * and license in png.h
 */

/* The symbols declared in this file (including the functions declared
 * as PNG_EXTERN) are PRIVATE.  They are not part of the libpng public
 * interface, and are not recommended for use by regular applications.
 * Some of them may become public in the future; others may stay private,
 * change in an incompatible way, or even disappear.
 * Although the libpng users are not forbidden to include this header,
 * they should be well aware of the issues that may arise from doing so.
 */

#ifndef PNGPRIV_H
#define PNGPRIV_H

#ifndef PNG_VERSION_INFO_ONLY

#if defined(_AIX) && defined(_ALL_SOURCE)
   /* On AIX if _ALL_SOURCE is defined standard header files (including
    * stdlib.h) define identifiers that are not permitted by the ANSI and
    * POSIX standards.  In particular 'jmpbuf' is #defined and this will
    * prevent compilation of libpng.  The following prevents this:
    */
#  undef _ALL_SOURCE
#endif

#include <stdlib.h>

#ifndef PNG_EXTERN
/* The functions exported by PNG_EXTERN are internal functions, which
 * aren't usually used outside the library (as far as I know), so it is
 * debatable if they should be exported at all.  In the future, when it
 * is possible to have run-time registry of chunk-handling functions,
 * some of these will be made available again.
#  define PNG_EXTERN extern
 */
#  define PNG_EXTERN
#endif

/* Other defines specific to compilers can go here.  Try to keep
 * them inside an appropriate ifdef/endif pair for portability.
 */

#ifdef PNG_FLOATING_POINT_SUPPORTED
#  ifdef MACOS
     /* We need to check that <math.h> hasn't already been included earlier
      * as it seems it doesn't agree with <fp.h>, yet we should really use
      * <fp.h> if possible.
      */
#    if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
#      include <fp.h>
#    endif
#  else
#    include <math.h>
#  endif
#  if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
     /* Amiga SAS/C: We must include builtin FPU functions when compiling using
      * MATH=68881
      */
#    include <m68881.h>
#  endif
#endif

/* Codewarrior on NT has linking problems without this. */
#if (defined(__MWERKS__) && defined(WIN32)) || defined(__STDC__)
#  define PNG_ALWAYS_EXTERN
#endif

/* This provides the non-ANSI (far) memory allocation routines. */
#if defined(__TURBOC__) && defined(__MSDOS__)
#  include <mem.h>
#  include <alloc.h>
#endif

#if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \
    defined(_WIN32) || defined(__WIN32__)
#  include <windows.h>  /* defines _WINDOWS_ macro */
#endif

/* Various modes of operation.  Note that after an init, mode is set to
 * zero automatically when the structure is created.
 */
#define PNG_HAVE_IHDR               0x01
#define PNG_HAVE_PLTE               0x02
#define PNG_HAVE_IDAT               0x04
#define PNG_AFTER_IDAT              0x08 /* Have complete zlib datastream */
#define PNG_HAVE_IEND               0x10
#define PNG_HAVE_gAMA               0x20
#define PNG_HAVE_cHRM               0x40
#define PNG_HAVE_sRGB               0x80
#define PNG_HAVE_CHUNK_HEADER      0x100
#define PNG_WROTE_tIME             0x200
#define PNG_WROTE_INFO_BEFORE_PLTE 0x400
#define PNG_BACKGROUND_IS_GRAY     0x800
#define PNG_HAVE_PNG_SIGNATURE    0x1000
#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */

/* Flags for the transformations the PNG library does on the image data */
#define PNG_BGR                 0x0001
#define PNG_INTERLACE           0x0002
#define PNG_PACK                0x0004
#define PNG_SHIFT               0x0008
#define PNG_SWAP_BYTES          0x0010
#define PNG_INVERT_MONO         0x0020
#define PNG_QUANTIZE            0x0040 /* formerly PNG_DITHER */
#define PNG_BACKGROUND          0x0080
#define PNG_BACKGROUND_EXPAND   0x0100
                          /*    0x0200 unused */
#define PNG_16_TO_8             0x0400
#define PNG_RGBA                0x0800
#define PNG_EXPAND              0x1000
#define PNG_GAMMA               0x2000
#define PNG_GRAY_TO_RGB         0x4000
#define PNG_FILLER              0x8000L
#define PNG_PACKSWAP           0x10000L
#define PNG_SWAP_ALPHA         0x20000L
#define PNG_STRIP_ALPHA        0x40000L
#define PNG_INVERT_ALPHA       0x80000L
#define PNG_USER_TRANSFORM    0x100000L
#define PNG_RGB_TO_GRAY_ERR   0x200000L
#define PNG_RGB_TO_GRAY_WARN  0x400000L
#define PNG_RGB_TO_GRAY       0x600000L  /* two bits, RGB_TO_GRAY_ERR|WARN */
                       /*     0x800000L     Unused */
#define PNG_ADD_ALPHA         0x1000000L  /* Added to libpng-1.2.7 */
#define PNG_EXPAND_tRNS       0x2000000L  /* Added to libpng-1.2.9 */
                       /*   0x4000000L  unused */
                       /*   0x8000000L  unused */
                       /*  0x10000000L  unused */
                       /*  0x20000000L  unused */
                       /*  0x40000000L  unused */

/* Flags for png_create_struct */
#define PNG_STRUCT_PNG   0x0001
#define PNG_STRUCT_INFO  0x0002

/* Scaling factor for filter heuristic weighting calculations */
#define PNG_WEIGHT_SHIFT 8
#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
#define PNG_COST_SHIFT 3
#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))

/* Flags for the png_ptr->flags rather than declaring a byte for each one */
#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY     0x0001
#define PNG_FLAG_ZLIB_CUSTOM_LEVEL        0x0002
#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL    0x0004
#define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS  0x0008
#define PNG_FLAG_ZLIB_CUSTOM_METHOD       0x0010
#define PNG_FLAG_ZLIB_FINISHED            0x0020
#define PNG_FLAG_ROW_INIT                 0x0040
#define PNG_FLAG_FILLER_AFTER             0x0080
#define PNG_FLAG_CRC_ANCILLARY_USE        0x0100
#define PNG_FLAG_CRC_ANCILLARY_NOWARN     0x0200
#define PNG_FLAG_CRC_CRITICAL_USE         0x0400
#define PNG_FLAG_CRC_CRITICAL_IGNORE      0x0800
                                /*        0x1000  unused */
                                /*        0x2000  unused */
                                /*        0x4000  unused */
#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS      0x8000L
#define PNG_FLAG_KEEP_UNSAFE_CHUNKS       0x10000L
#define PNG_FLAG_LIBRARY_MISMATCH         0x20000L
#define PNG_FLAG_STRIP_ERROR_NUMBERS      0x40000L
#define PNG_FLAG_STRIP_ERROR_TEXT         0x80000L
#define PNG_FLAG_MALLOC_NULL_MEM_OK       0x100000L
#define PNG_FLAG_ADD_ALPHA                0x200000L  /* Added to libpng-1.2.8 */
#define PNG_FLAG_STRIP_ALPHA              0x400000L  /* Added to libpng-1.2.8 */
#define PNG_FLAG_BENIGN_ERRORS_WARN       0x800000L  /* Added to libpng-1.4.0 */
                                  /*     0x1000000L  unused */
                                  /*     0x2000000L  unused */
                                  /*     0x4000000L  unused */
                                  /*     0x8000000L  unused */
                                  /*    0x10000000L  unused */
                                  /*    0x20000000L  unused */
                                  /*    0x40000000L  unused */

#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
                                     PNG_FLAG_CRC_ANCILLARY_NOWARN)

#define PNG_FLAG_CRC_CRITICAL_MASK  (PNG_FLAG_CRC_CRITICAL_USE | \
                                     PNG_FLAG_CRC_CRITICAL_IGNORE)

#define PNG_FLAG_CRC_MASK           (PNG_FLAG_CRC_ANCILLARY_MASK | \
                                     PNG_FLAG_CRC_CRITICAL_MASK)

/* Save typing and make code easier to understand */

#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
   abs((int)((c1).green) - (int)((c2).green)) + \
   abs((int)((c1).blue) - (int)((c2).blue)))

/* Added to libpng-1.2.6 JB */
#define PNG_ROWBYTES(pixel_bits, width) \
    ((pixel_bits) >= 8 ? \
    ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \
    (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) )

/* PNG_OUT_OF_RANGE returns true if value is outside the range
 * ideal-delta..ideal+delta.  Each argument is evaluated twice.
 * "ideal" and "delta" should be constants, normally simple
 * integers, "value" a variable. Added to libpng-1.2.6 JB
 */
#define PNG_OUT_OF_RANGE(value, ideal, delta) \
        ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )

/* Constant strings for known chunk types.  If you need to add a chunk,
 * define the name here, and add an invocation of the macro wherever it's
 * needed.
 */
#define PNG_IHDR PNG_CONST png_byte png_IHDR[5] = { 73,  72,  68,  82, '\0'}
#define PNG_IDAT PNG_CONST png_byte png_IDAT[5] = { 73,  68,  65,  84, '\0'}
#define PNG_IEND PNG_CONST png_byte png_IEND[5] = { 73,  69,  78,  68, '\0'}
#define PNG_PLTE PNG_CONST png_byte png_PLTE[5] = { 80,  76,  84,  69, '\0'}
#define PNG_bKGD PNG_CONST png_byte png_bKGD[5] = { 98,  75,  71,  68, '\0'}
#define PNG_cHRM PNG_CONST png_byte png_cHRM[5] = { 99,  72,  82,  77, '\0'}
#define PNG_gAMA PNG_CONST png_byte png_gAMA[5] = {103,  65,  77,  65, '\0'}
#define PNG_hIST PNG_CONST png_byte png_hIST[5] = {104,  73,  83,  84, '\0'}
#define PNG_iCCP PNG_CONST png_byte png_iCCP[5] = {105,  67,  67,  80, '\0'}
#define PNG_iTXt PNG_CONST png_byte png_iTXt[5] = {105,  84,  88, 116, '\0'}
#define PNG_oFFs PNG_CONST png_byte png_oFFs[5] = {111,  70,  70, 115, '\0'}
#define PNG_pCAL PNG_CONST png_byte png_pCAL[5] = {112,  67,  65,  76, '\0'}
#define PNG_sCAL PNG_CONST png_byte png_sCAL[5] = {115,  67,  65,  76, '\0'}
#define PNG_pHYs PNG_CONST png_byte png_pHYs[5] = {112,  72,  89, 115, '\0'}
#define PNG_sBIT PNG_CONST png_byte png_sBIT[5] = {115,  66,  73,  84, '\0'}
#define PNG_sPLT PNG_CONST png_byte png_sPLT[5] = {115,  80,  76,  84, '\0'}
#define PNG_sRGB PNG_CONST png_byte png_sRGB[5] = {115,  82,  71,  66, '\0'}
#define PNG_sTER PNG_CONST png_byte png_sTER[5] = {115,  84,  69,  82, '\0'}
#define PNG_tEXt PNG_CONST png_byte png_tEXt[5] = {116,  69,  88, 116, '\0'}
#define PNG_tIME PNG_CONST png_byte png_tIME[5] = {116,  73,  77,  69, '\0'}
#define PNG_tRNS PNG_CONST png_byte png_tRNS[5] = {116,  82,  78,  83, '\0'}
#define PNG_zTXt PNG_CONST png_byte png_zTXt[5] = {122,  84,  88, 116, '\0'}

/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

/* These functions are used internally in the code.  They generally
 * shouldn't be used unless you are writing code to add or replace some
 * functionality in libpng.  More information about most functions can
 * be found in the files where the functions are located.
 */

/* Allocate memory for an internal libpng struct */
PNG_EXTERN png_voidp png_create_struct PNGARG((int type));

/* Free memory from internal libpng struct */
PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));

PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
  malloc_fn, png_voidp mem_ptr));
PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
   png_free_ptr free_fn, png_voidp mem_ptr));

/* Free any memory that info_ptr points to and reset struct. */
PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
   png_infop info_ptr));

/* Function to allocate memory for zlib.  PNGAPI is disallowed. */
PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));

/* Function to free memory for zlib.  PNGAPI is disallowed. */
PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));

/* Next four functions are used internally as callbacks.  PNGAPI is required
 * but not PNG_EXPORT.  PNGAPI added at libpng version 1.2.3. */

PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
   png_bytep data, png_size_t length));

#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
   png_bytep buffer, png_size_t length));
#endif

PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,
   png_bytep data, png_size_t length));

#ifdef PNG_WRITE_FLUSH_SUPPORTED
#ifdef PNG_STDIO_SUPPORTED
PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr));
#endif
#endif

/* Reset the CRC variable */
PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));

/* Write the "data" buffer to whatever output you are using */
PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,
   png_size_t length));

/* Read and check the PNG file signature */
PNG_EXTERN void png_read_sig PNGARG((png_structp png_ptr, png_infop info_ptr));

/* Read the chunk header (length + type name) */
PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr));

/* Read data from whatever input you are using into the "data" buffer */
PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
   png_size_t length));

/* Read bytes into buf, and update png_ptr->crc */
PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
   png_size_t length));

/* Decompress data in a chunk that uses compression */
#if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
    defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,
   int comp_type, png_size_t chunklength, png_size_t prefix_length,
   png_size_t *data_length));
#endif

/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));

/* Read the CRC from the file and compare it to the libpng calculated CRC */
PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));

/* Calculate the CRC over a section of data.  Note that we are only
 * passing a maximum of 64K on systems that have this as a memory limit,
 * since this is the maximum buffer size we can specify.
 */
PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
   png_size_t length));

#ifdef PNG_WRITE_FLUSH_SUPPORTED
PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
#endif

/* Write various chunks */

/* Write the IHDR chunk, and update the png_struct with the necessary
 * information.
 */
PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
   png_uint_32 height,
   int bit_depth, int color_type, int compression_method, int filter_method,
   int interlace_method));

PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
   png_uint_32 num_pal));

PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
   png_size_t length));

PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));

#ifdef PNG_WRITE_gAMA_SUPPORTED
#ifdef PNG_FLOATING_POINT_SUPPORTED
PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
#endif
#ifdef PNG_FIXED_POINT_SUPPORTED
PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr,
    png_fixed_point file_gamma));
#endif
#endif

#ifdef PNG_WRITE_sBIT_SUPPORTED
PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
   int color_type));
#endif

#ifdef PNG_WRITE_cHRM_SUPPORTED
#ifdef PNG_FLOATING_POINT_SUPPORTED
PNG_EXTERN void png_write_cHRM PNGARG((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));
#endif
PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
   png_fixed_point int_white_x, png_fixed_point int_white_y,
   png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
   int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
   png_fixed_point int_blue_y));
#endif

#ifdef PNG_WRITE_sRGB_SUPPORTED
PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
   int intent));
#endif

#ifdef PNG_WRITE_iCCP_SUPPORTED
PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
   png_charp name, int compression_type,
   png_charp profile, int proflen));
   /* Note to maintainer: profile should be png_bytep */
#endif

#ifdef PNG_WRITE_sPLT_SUPPORTED
PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
   png_sPLT_tp palette));
#endif

#ifdef PNG_WRITE_tRNS_SUPPORTED
PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
   png_color_16p values, int number, int color_type));
#endif

#ifdef PNG_WRITE_bKGD_SUPPORTED
PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
   png_color_16p values, int color_type));
#endif

#ifdef PNG_WRITE_hIST_SUPPORTED
PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
   int num_hist));
#endif

#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
    defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
   png_charp key, png_charpp new_key));
#endif

#ifdef PNG_WRITE_tEXt_SUPPORTED
PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,
   png_charp text, png_size_t text_len));
#endif

#ifdef PNG_WRITE_zTXt_SUPPORTED
PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
   png_charp text, png_size_t text_len, int compression));
#endif

#ifdef PNG_WRITE_iTXt_SUPPORTED
PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
   int compression, png_charp key, png_charp lang, png_charp lang_key,
   png_charp text));
#endif

#ifdef PNG_TEXT_SUPPORTED  /* Added at version 1.0.14 and 1.2.4 */
PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
   png_infop info_ptr, png_textp text_ptr, int num_text));
#endif

#ifdef PNG_WRITE_oFFs_SUPPORTED
PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
   png_int_32 x_offset, png_int_32 y_offset, int unit_type));
#endif

#ifdef PNG_WRITE_pCAL_SUPPORTED
PNG_EXTERN void png_write_pCAL PNGARG((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));
#endif

#ifdef PNG_WRITE_pHYs_SUPPORTED
PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
   png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
   int unit_type));
#endif

#ifdef PNG_WRITE_tIME_SUPPORTED
PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
   png_timep mod_time));
#endif

#ifdef PNG_WRITE_sCAL_SUPPORTED
#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_STDIO_SUPPORTED)
PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
   int unit, double width, double height));
#else
#ifdef PNG_FIXED_POINT_SUPPORTED
PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
   int unit, png_charp width, png_charp height));
#endif
#endif
#endif

/* Called when finished processing a row of data */
PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));

/* Internal use only.   Called before first row of data */
PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));

#ifdef PNG_READ_GAMMA_SUPPORTED
PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr,
   png_byte bit_depth));
#endif

/* Combine a row of data, dealing with alpha, etc. if requested */
PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
   int mask));

#ifdef PNG_READ_INTERLACING_SUPPORTED
/* Expand an interlaced row */
/* OLD pre-1.0.9 interface:
PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
   png_bytep row, int pass, png_uint_32 transformations));
 */
PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));
#endif

/* GRR TO DO (2.0 or whenever):  simplify other internal calling interfaces */

#ifdef PNG_WRITE_INTERLACING_SUPPORTED
/* Grab pixels out of a row for an interlaced pass */
PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
   png_bytep row, int pass));
#endif

/* Unfilter a row */
PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
   png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));

/* Choose the best filter to use and filter the row data */
PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
   png_row_infop row_info));

/* Write out the filtered row. */
PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
   png_bytep filtered_row));
/* Finish a row while reading, dealing with interlacing passes, etc. */
PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));

/* Initialize the row buffers, etc. */
PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
/* Optional call to update the users info structure */
PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
   png_infop info_ptr));

/* These are the functions that do the transformations */
#ifdef PNG_READ_FILLER_SUPPORTED
PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
   png_bytep row, png_uint_32 filler, png_uint_32 flags));
#endif

#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
   png_bytep row));
#endif

#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
   png_bytep row));
#endif

#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
   png_bytep row));
#endif

#ifdef 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,
   png_bytep row, png_uint_32 flags));
#endif

#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
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_SUPPORTED)
PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
#endif

#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
   row_info, png_bytep row));
#endif

#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
   png_bytep row));
#endif

#ifdef PNG_READ_PACK_SUPPORTED
PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row));
#endif

#ifdef PNG_READ_SHIFT_SUPPORTED
PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,
   png_color_8p sig_bits));
#endif

#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row));
#endif

#ifdef PNG_READ_16_TO_8_SUPPORTED
PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row));
#endif

#ifdef PNG_READ_QUANTIZE_SUPPORTED
PNG_EXTERN void png_do_quantize PNGARG((png_row_infop row_info,
   png_bytep row, png_bytep palette_lookup, png_bytep quantize_lookup));

#  ifdef PNG_CORRECT_PALETTE_SUPPORTED
PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
   png_colorp palette, int num_palette));
#  endif
#endif

#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row));
#endif

#ifdef PNG_WRITE_PACK_SUPPORTED
PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
   png_bytep row, png_uint_32 bit_depth));
#endif

#ifdef PNG_WRITE_SHIFT_SUPPORTED
PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,
   png_color_8p bit_depth));
#endif

#ifdef PNG_READ_BACKGROUND_SUPPORTED
#ifdef PNG_READ_GAMMA_SUPPORTED
PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
   png_color_16p trans_color, 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));
#else
PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
   png_color_16p trans_color, png_color_16p background));
#endif
#endif

#ifdef PNG_READ_GAMMA_SUPPORTED
PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,
   png_bytep gamma_table, png_uint_16pp gamma_16_table,
   int gamma_shift));
#endif

#ifdef PNG_READ_EXPAND_SUPPORTED
PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
   png_bytep row, png_colorp palette, png_bytep trans, int num_trans));
PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
   png_bytep row, png_color_16p trans_value));
#endif

/* The following decodes the appropriate chunks, and does error correction,
 * then calls the appropriate callback for the chunk if it is valid.
 */

/* Decode the IHDR chunk */
PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
   png_uint_32 length));
PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
   png_uint_32 length));
PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
   png_uint_32 length));

#ifdef PNG_READ_bKGD_SUPPORTED
PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
   png_uint_32 length));
#endif

#ifdef PNG_READ_cHRM_SUPPORTED
PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
   png_uint_32 length));
#endif

#ifdef PNG_READ_gAMA_SUPPORTED
PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
   png_uint_32 length));
#endif

#ifdef PNG_READ_hIST_SUPPORTED
PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
   png_uint_32 length));
#endif

#ifdef PNG_READ_iCCP_SUPPORTED
PNG_EXTERN void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
   png_uint_32 length));
#endif /* PNG_READ_iCCP_SUPPORTED */

#ifdef PNG_READ_iTXt_SUPPORTED
PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
   png_uint_32 length));
#endif

#ifdef PNG_READ_oFFs_SUPPORTED
PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
   png_uint_32 length));
#endif

#ifdef PNG_READ_pCAL_SUPPORTED
PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
   png_uint_32 length));
#endif

#ifdef PNG_READ_pHYs_SUPPORTED
PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
   png_uint_32 length));
#endif

#ifdef PNG_READ_sBIT_SUPPORTED
PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
   png_uint_32 length));
#endif

#ifdef PNG_READ_sCAL_SUPPORTED
PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
   png_uint_32 length));
#endif

#ifdef PNG_READ_sPLT_SUPPORTED
PNG_EXTERN void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
   png_uint_32 length));
#endif /* PNG_READ_sPLT_SUPPORTED */

#ifdef PNG_READ_sRGB_SUPPORTED
PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
   png_uint_32 length));
#endif

#ifdef PNG_READ_tEXt_SUPPORTED
PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
   png_uint_32 length));
#endif

#ifdef PNG_READ_tIME_SUPPORTED
PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
   png_uint_32 length));
#endif

#ifdef PNG_READ_tRNS_SUPPORTED
PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
   png_uint_32 length));
#endif

#ifdef PNG_READ_zTXt_SUPPORTED
PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
   png_uint_32 length));
#endif

PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
   png_infop info_ptr, png_uint_32 length));

PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
   png_bytep chunk_name));

/* Handle the transformations for reading and writing */
PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));

PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));

#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
   png_infop info_ptr));
PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
   png_infop info_ptr));
PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));
PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
   png_uint_32 length));
PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
   png_bytep buffer, png_size_t buffer_length));
PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));
PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
   png_bytep buffer, png_size_t buffer_length));
PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));
PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
   png_infop info_ptr, png_uint_32 length));
PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
   png_infop info_ptr));
PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
   png_infop info_ptr));
PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));
PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
   png_infop info_ptr));
PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
   png_infop info_ptr));
PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));
#ifdef PNG_READ_tEXt_SUPPORTED
PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
   png_infop info_ptr, png_uint_32 length));
PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
   png_infop info_ptr));
#endif
#ifdef PNG_READ_zTXt_SUPPORTED
PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
   png_infop info_ptr, png_uint_32 length));
PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
   png_infop info_ptr));
#endif
#ifdef PNG_READ_iTXt_SUPPORTED
PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
   png_infop info_ptr, png_uint_32 length));
PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
   png_infop info_ptr));
#endif

#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */

#ifdef PNG_MNG_FEATURES_SUPPORTED
PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
   png_bytep row));
PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
   png_bytep row));
#endif

/* Added at libpng version 1.4.0 */
#ifdef PNG_cHRM_SUPPORTED
PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr,
   png_fixed_point int_white_x, png_fixed_point int_white_y,
   png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
   int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
   png_fixed_point int_blue_y));
#endif

#ifdef PNG_cHRM_SUPPORTED
#ifdef PNG_CHECK_cHRM_SUPPORTED
/* Added at libpng version 1.2.34 and 1.4.0 */
PNG_EXTERN void png_64bit_product PNGARG((long v1, long v2,
   unsigned long *hi_product, unsigned long *lo_product));
#endif
#endif

/* Added at libpng version 1.4.0 */
PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr,
   png_uint_32 width, png_uint_32 height, int bit_depth,
   int color_type, int interlace_type, int compression_type,
   int filter_type));

/* Free all memory used by the read (old method - NOT DLL EXPORTED) */
PNG_EXTERN void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
   png_infop end_info_ptr));

/* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
PNG_EXTERN void png_write_destroy PNGARG((png_structp png_ptr));

#ifdef USE_FAR_KEYWORD  /* memory model conversion function */
PNG_EXTERN void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
   int check));
#endif /* USE_FAR_KEYWORD */

/* Define PNG_DEBUG at compile time for debugging information.  Higher
 * numbers for PNG_DEBUG mean more debugging information.  This has
 * only been added since version 0.95 so it is not implemented throughout
 * libpng yet, but more support will be added as needed.
 */
#ifdef PNG_DEBUG
#if (PNG_DEBUG > 0)
#if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
#include <crtdbg.h>
#if (PNG_DEBUG > 1)
#ifndef _DEBUG
#  define _DEBUG
#endif
#ifndef png_debug
#define png_debug(l,m)  _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE)
#endif
#ifndef png_debug1
#define png_debug1(l,m,p1)  _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1)
#endif
#ifndef png_debug2
#define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2)
#endif
#endif
#else /* PNG_DEBUG_FILE || !_MSC_VER */
#ifndef PNG_DEBUG_FILE
#define PNG_DEBUG_FILE stderr
#endif /* PNG_DEBUG_FILE */

#if (PNG_DEBUG > 1)
/* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on
 * non-ISO compilers
 */
#  ifdef __STDC__
#    ifndef png_debug
#      define png_debug(l,m) \
       { \
       int num_tabs=l; \
       fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
       }
#    endif
#    ifndef png_debug1
#      define png_debug1(l,m,p1) \
       { \
       int num_tabs=l; \
       fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
       }
#    endif
#    ifndef png_debug2
#      define png_debug2(l,m,p1,p2) \
       { \
       int num_tabs=l; \
       fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
       }
#    endif
#  else /* __STDC __ */
#    ifndef png_debug
#      define png_debug(l,m) \
       { \
       int num_tabs=l; \
       char format[256]; \
       snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
         m,PNG_STRING_NEWLINE); \
       fprintf(PNG_DEBUG_FILE,format); \
       }
#    endif
#    ifndef png_debug1
#      define png_debug1(l,m,p1) \
       { \
       int num_tabs=l; \
       char format[256]; \
       snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
         m,PNG_STRING_NEWLINE); \
       fprintf(PNG_DEBUG_FILE,format,p1); \
       }
#    endif
#    ifndef png_debug2
#      define png_debug2(l,m,p1,p2) \
       { \
       int num_tabs=l; \
       char format[256]; \
       snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
         m,PNG_STRING_NEWLINE); \
       fprintf(PNG_DEBUG_FILE,format,p1,p2); \
       }
#    endif
#  endif /* __STDC __ */
#endif /* (PNG_DEBUG > 1) */

#endif /* _MSC_VER */
#endif /* (PNG_DEBUG > 0) */
#endif /* PNG_DEBUG */
#ifndef png_debug
#define png_debug(l, m)
#endif
#ifndef png_debug1
#define png_debug1(l, m, p1)
#endif
#ifndef png_debug2
#define png_debug2(l, m, p1, p2)
#endif

/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */

#ifdef __cplusplus
}
#endif

#endif /* PNG_VERSION_INFO_ONLY */
#endif /* PNGPRIV_H */


code:
/*---------------------------------------------------------------------------

   rpng - simple PNG display program                              readpng.h

  ---------------------------------------------------------------------------

      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.

      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
      be held liable for any damages arising in any way from the use of
      this software.

      The contents of this file are DUAL-LICENSED.  You may modify and/or
      redistribute this software according to the terms of one of the
      following two licenses (at your option):

      LICENSE 1 ("BSD-like with advertising clause"):

      Permission is granted to anyone to use this software for any purpose,
      including commercial applications, and to alter it and redistribute
      it freely, subject to the following restrictions:

      1. Redistributions of source code must retain the above copyright
         notice, disclaimer, and this list of conditions.
      2. Redistributions in binary form must reproduce the above copyright
         notice, disclaimer, and this list of conditions in the documenta-
         tion and/or other materials provided with the distribution.
      3. All advertising materials mentioning features or use of this
         software must display the following acknowledgment:

            This product includes software developed by Greg Roelofs
            and contributors for the book, "PNG: The Definitive Guide,"
            published by O'Reilly and Associates.

      LICENSE 2 (GNU GPL v2 or later):

      This program is free software; you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published by
      the Free Software Foundation; either version 2 of the License, or
      (at your option) any later version.

      This program is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      GNU General Public License for more details.

      You should have received a copy of the GNU General Public License
      along with this program; if not, write to the Free Software Foundation,
      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

  ---------------------------------------------------------------------------*/

#ifndef TRUE
#  define TRUE 1
#  define FALSE 0
#endif

#ifndef MAX
#  define MAX(a,b)  ((a) > (b)? (a) : (b))
#  define MIN(a,b)  ((a) < (b)? (a) : (b))
#endif

#ifdef DEBUG
#  define Trace(x)  {fprintf x ; fflush(stderr); fflush(stdout);}
#else
#  define Trace(x)  ;
#endif

typedef unsigned char   uch;
typedef unsigned short  ush;
typedef unsigned long   ulg;

/* prototypes for public functions in readpng.c */

void readpng_version_info(void);

int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight);

int readpng_get_bgcolor(uch *bg_red, uch *bg_green, uch *bg_blue);

uch *readpng_get_image(double display_exponent, int *pChannels,
                       ulg *pRowbytes);

void readpng_cleanup(int free_image_data);


code:
/*---------------------------------------------------------------------------

   rpng2 - progressive-model PNG display program                 readpng2.h

  ---------------------------------------------------------------------------

      Copyright (c) 1998-2008 Greg Roelofs.  All rights reserved.

      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
      be held liable for any damages arising in any way from the use of
      this software.

      The contents of this file are DUAL-LICENSED.  You may modify and/or
      redistribute this software according to the terms of one of the
      following two licenses (at your option):

      LICENSE 1 ("BSD-like with advertising clause"):

      Permission is granted to anyone to use this software for any purpose,
      including commercial applications, and to alter it and redistribute
      it freely, subject to the following restrictions:

      1. Redistributions of source code must retain the above copyright
         notice, disclaimer, and this list of conditions.
      2. Redistributions in binary form must reproduce the above copyright
         notice, disclaimer, and this list of conditions in the documenta-
         tion and/or other materials provided with the distribution.
      3. All advertising materials mentioning features or use of this
         software must display the following acknowledgment:

            This product includes software developed by Greg Roelofs
            and contributors for the book, "PNG: The Definitive Guide,"
            published by O'Reilly and Associates.

      LICENSE 2 (GNU GPL v2 or later):

      This program is free software; you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published by
      the Free Software Foundation; either version 2 of the License, or
      (at your option) any later version.

      This program is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      GNU General Public License for more details.

      You should have received a copy of the GNU General Public License
      along with this program; if not, write to the Free Software Foundation,
      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

  ---------------------------------------------------------------------------*/

#ifndef TRUE
#  define TRUE 1
#  define FALSE 0
#endif

#ifndef MAX
#  define MAX(a,b)  ((a) > (b)? (a) : (b))
#  define MIN(a,b)  ((a) < (b)? (a) : (b))
#endif

#ifdef DEBUG
#  define Trace(x)  {fprintf x ; fflush(stderr); fflush(stdout);}
#else
#  define Trace(x)  ;
#endif

enum rpng2_states {
    kPreInit = 0,
    kWindowInit,
    kDone
};

typedef unsigned char   uch;
typedef unsigned short  ush;
typedef unsigned long   ulg;

typedef struct _mainprog_info {
    double display_exponent;
    ulg width;
    ulg height;
    void *png_ptr;
    void *info_ptr;
    void (*mainprog_init)(void);
    void (*mainprog_display_row)(ulg row_num);
    void (*mainprog_finish_display)(void);
    uch *image_data;
    uch **row_pointers;
    jmp_buf jmpbuf;
    int passes;              /* not used */
    int pass;
    int rowbytes;
    int channels;
    int need_bgcolor;
    int state;
    uch bg_red;
    uch bg_green;
    uch bg_blue;
} mainprog_info;

/* prototypes for public functions in readpng2.c */

void readpng2_version_info(void);

int readpng2_check_sig(uch *sig, int num);

int readpng2_init(mainprog_info *mainprog_ptr);

int readpng2_decode_data(mainprog_info *mainprog_ptr, uch *rawbuf, ulg length);

void readpng2_cleanup(mainprog_info *mainprog_ptr);


code:
//{{NO_DEPENDENCIES}}
// Microsoft Developer Studio generated include file.
// Used by VisualPng.rc
//
#define IDM_FILE_OPEN                   40001
#define IDM_FILE_SAVE                   40002
#define IDM_FILE_NEXT                   40003
#define IDM_FILE_PREVIOUS               40004
#define IDM_FILE_EXIT                   40005
#define IDM_OPTIONS_BACKGROUND          40006
#define IDM_OPTIONS_STRETCH             40007
#define IDM_HELP_ABOUT                  40008

// Next default values for new objects
//
#ifdef APSTUDIO_INVOKED
#ifndef APSTUDIO_READONLY_SYMBOLS
#define _APS_NEXT_RESOURCE_VALUE        113
#define _APS_NEXT_COMMAND_VALUE         40009
#define _APS_NEXT_CONTROL_VALUE         1001
#define _APS_NEXT_SYMED_VALUE           101
#endif
#endif


code:
/*---------------------------------------------------------------------------

   wpng - simple PNG-writing program                             writepng.h

  ---------------------------------------------------------------------------

      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.

      This software is provided "as is," without warranty of any kind,
      express or implied.  In no event shall the author or contributors
      be held liable for any damages arising in any way from the use of
      this software.

      The contents of this file are DUAL-LICENSED.  You may modify and/or
      redistribute this software according to the terms of one of the
      following two licenses (at your option):

      LICENSE 1 ("BSD-like with advertising clause"):

      Permission is granted to anyone to use this software for any purpose,
      including commercial applications, and to alter it and redistribute
      it freely, subject to the following restrictions:

      1. Redistributions of source code must retain the above copyright
         notice, disclaimer, and this list of conditions.
      2. Redistributions in binary form must reproduce the above copyright
         notice, disclaimer, and this list of conditions in the documenta-
         tion and/or other materials provided with the distribution.
      3. All advertising materials mentioning features or use of this
         software must display the following acknowledgment:

            This product includes software developed by Greg Roelofs
            and contributors for the book, "PNG: The Definitive Guide,"
            published by O'Reilly and Associates.

      LICENSE 2 (GNU GPL v2 or later):

      This program is free software; you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published by
      the Free Software Foundation; either version 2 of the License, or
      (at your option) any later version.

      This program is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      GNU General Public License for more details.

      You should have received a copy of the GNU General Public License
      along with this program; if not, write to the Free Software Foundation,
      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

  ---------------------------------------------------------------------------*/

#ifndef TRUE
#  define TRUE 1
#  define FALSE 0
#endif

#ifndef MAX
#  define MAX(a,b)  ((a) > (b)? (a) : (b))
#  define MIN(a,b)  ((a) < (b)? (a) : (b))
#endif

#ifdef DEBUG
#  define Trace(x)  {fprintf x ; fflush(stderr); fflush(stdout);}
#else
#  define Trace(x)  ;
#endif

#define TEXT_TITLE    0x01
#define TEXT_AUTHOR   0x02
#define TEXT_DESC     0x04
#define TEXT_COPY     0x08
#define TEXT_EMAIL    0x10
#define TEXT_URL      0x20

#define TEXT_TITLE_OFFSET        0
#define TEXT_AUTHOR_OFFSET      72
#define TEXT_COPY_OFFSET     (2*72)
#define TEXT_EMAIL_OFFSET    (3*72)
#define TEXT_URL_OFFSET      (4*72)
#define TEXT_DESC_OFFSET     (5*72)

typedef unsigned char   uch;
typedef unsigned short  ush;
typedef unsigned long   ulg;

typedef struct _mainprog_info {
    double gamma;
    long width;
    long height;
    time_t modtime;
    FILE *infile;
    FILE *outfile;
    void *png_ptr;
    void *info_ptr;
    uch *image_data;
    uch **row_pointers;
    char *title;
    char *author;
    char *desc;
    char *copyright;
    char *email;
    char *url;
    int filter;    /* command-line-filter flag, not PNG row filter! */
    int pnmtype;
    int sample_depth;
    int interlaced;
    int have_bg;
    int have_time;
    int have_text;
    jmp_buf jmpbuf;
    uch bg_red;
    uch bg_green;
    uch bg_blue;
} mainprog_info;

/* prototypes for public functions in writepng.c */

void writepng_version_info(void);

int writepng_init(mainprog_info *mainprog_ptr);

int writepng_encode_image(mainprog_info *mainprog_ptr);

int writepng_encode_row(mainprog_info *mainprog_ptr);

int writepng_encode_finish(mainprog_info *mainprog_ptr);

void writepng_cleanup(mainprog_info *mainprog_ptr);


code:
/*
 * Summary: old DocBook SGML parser
 * Description: interface for a DocBook SGML non-verifying parser
 * This code is DEPRECATED, and should not be used anymore.
 *
 * Copy: See Copyright for the status of this software.
 *
 * Author: Daniel Veillard
 */

#ifndef __DOCB_PARSER_H__
#define __DOCB_PARSER_H__
#include <libxml/xmlversion.h>

#ifdef LIBXML_DOCB_ENABLED

#include <libxml/parser.h>
#include <libxml/parserInternals.h>

#ifndef IN_LIBXML
#ifdef __GNUC__
#warning "The DOCBparser module has been deprecated in libxml2-2.6.0"
#endif
#endif

#ifdef __cplusplus
extern "C" {
#endif

/*
 * Most of the back-end structures from XML and SGML are shared.
 */
typedef xmlParserCtxt docbParserCtxt;
typedef xmlParserCtxtPtr docbParserCtxtPtr;
typedef xmlSAXHandler docbSAXHandler;
typedef xmlSAXHandlerPtr docbSAXHandlerPtr;
typedef xmlParserInput docbParserInput;
typedef xmlParserInputPtr docbParserInputPtr;
typedef xmlDocPtr docbDocPtr;

/*
 * There is only few public functions.
 */
XMLPUBFUN int XMLCALL
		     docbEncodeEntities(unsigned char *out,
                                        int *outlen,
                                        const unsigned char *in,
                                        int *inlen, int quoteChar);

XMLPUBFUN docbDocPtr XMLCALL
		     docbSAXParseDoc   (xmlChar *cur,
                                        const char *encoding,
                                        docbSAXHandlerPtr sax,
                                        void *userData);
XMLPUBFUN docbDocPtr XMLCALL
		     docbParseDoc      (xmlChar *cur,
                                        const char *encoding);
XMLPUBFUN docbDocPtr XMLCALL
		     docbSAXParseFile  (const char *filename,
                                        const char *encoding,
                                        docbSAXHandlerPtr sax,
                                        void *userData);
XMLPUBFUN docbDocPtr XMLCALL
		     docbParseFile     (const char *filename,
                                        const char *encoding);

/**
 * Interfaces for the Push mode.
 */
XMLPUBFUN void XMLCALL
		     docbFreeParserCtxt      (docbParserCtxtPtr ctxt);
XMLPUBFUN docbParserCtxtPtr XMLCALL
		     docbCreatePushParserCtxt(docbSAXHandlerPtr sax,
                                              void *user_data,
                                              const char *chunk,
                                              int size,
                                              const char *filename,
                                              xmlCharEncoding enc);
XMLPUBFUN int XMLCALL
		     docbParseChunk          (docbParserCtxtPtr ctxt,
                                              const char *chunk,
                                              int size,
                                              int terminate);
XMLPUBFUN docbParserCtxtPtr XMLCALL
		     docbCreateFileParserCtxt(const char *filename,
                                              const char *encoding);
XMLPUBFUN int XMLCALL
		     docbParseDocument       (docbParserCtxtPtr ctxt);

#ifdef __cplusplus
}
#endif

#endif /* LIBXML_DOCB_ENABLED */

#endif /* __DOCB_PARSER_H__ */