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 *

 * libpng version 1.5.1 - February 3, 2011

 *

 * 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

 *

 */

 * 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.

 */

#define PNGCONF_H

 * definition file for  machine specific limits, this may impact the

 * correctness of the definitons below (see uses of INT_MAX).

 */

#ifndef PNG_NO_LIMITS_H

#  include 

#endif

 * because this file defines png_memcpy and so on the base APIs must

 * be defined here.

 */

#ifdef BSD

#  include 

#else

#  include 

#endif

 * FILE

 */

#ifdef PNG_STDIO_SUPPORTED

#  include 

#endif

 * from PNG files.  It can be set on a per-app-file basis - it

 * just changes whether a macro is used to the function is called.

 * The library builder sets the default, if read functions are not

 * built into the library the macro implementation is forced on.

 */

#ifndef PNG_READ_INT_FUNCTIONS_SUPPORTED

#  define PNG_USE_READ_MACROS

#endif

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

#  if PNG_DEFAULT_READ_MACROS

#    define PNG_USE_READ_MACROS

#  endif

#endif

 *

 * These options are provided so that a variety of difficult compilers

 * can be used.  Some are fixed at build time (e.g. PNG_API_RULE

 * below) but still have compiler specific implementations, others

 * may be changed on a per-file basis when compiling against libpng.

 */

 * 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

#    define PNGARG(arglist) OF(arglist)

#  else

#      define PNGARG(arglist) ()

#    else

#      define PNGARG(arglist) arglist

#    endif /* _NO_PROTO */

 * =============================

 * Normally it is not necessary to specify to the compiler how to call

 * a function - it just does it - however on x86 systems derived from

 * Microsoft and Borland C compilers ('IBM PC', 'DOS', 'Windows' systems

 * and some others) there are multiple ways to call a function and the

 * default can be changed on the compiler command line.  For this reason

 * libpng specifies the calling convention of every exported function and

 * every function called via a user supplied function pointer.  This is

 * done in this file by defining the following macros:

 *

 * PNGAPI    Calling convention for exported functions.

 * PNGCBAPI  Calling convention for user provided (callback) functions.

 * PNGCAPI   Calling convention used by the ANSI-C library (required

 *           for longjmp callbacks and sometimes used internally to

 *           specify the calling convention for zlib).

 *

 * These macros should never be overridden.  If it is necessary to

 * change calling convention in a private build this can be done

 * by setting PNG_API_RULE (which defaults to 0) to one of the values

 * below to select the correct 'API' variants.

 *

 * PNG_API_RULE=0 Use PNGCAPI - the 'C' calling convention - throughout.

 *                This is correct in every known environment.

 * PNG_API_RULE=1 Use the operating system convention for PNGAPI and

 *                the 'C' calling convention (from PNGCAPI) for

 *                callbacks (PNGCBAPI).  This is no longer required

 *                in any known environment - if it has to be used

 *                please post an explanation of the problem to the

 *                libpng mailing list.

 *

 * These cases only differ if the operating system does not use the C

 * calling convention, at present this just means the above cases

 * (x86 DOS/Windows sytems) and, even then, this does not apply to

 * Cygwin running on those systems.

 *

 * Note that the value must be defined in pnglibconf.h so that what

 * the application uses to call the library matches the conventions

 * set when building the library.

 */

 * =============

 * When building a shared library it is almost always necessary to tell

 * the compiler which symbols to export.  The png.h macro 'PNG_EXPORT'

 * is used to mark the symbols.  On some systems these symbols can be

 * extracted at link time and need no special processing by the compiler,

 * on other systems the symbols are flagged by the compiler and just

 * the declaration requires a special tag applied (unfortunately) in a

 * compiler dependent way.  Some systems can do either.

 *

 * A small number of older systems also require a symbol from a DLL to

 * be flagged to the program that calls it.  This is a problem because

 * we do not know in the header file included by application code that

 * the symbol will come from a shared library, as opposed to a statically

 * linked one.  For this reason the application must tell us by setting

 * the magic flag PNG_USE_DLL to turn on the special processing before

 * it includes png.h.

 *

 * Four additional macros are used to make this happen:

 *

 * PNG_IMPEXP The magic (if any) to cause a symbol to be exported from

 *            the build or imported if PNG_USE_DLL is set - compiler

 *            and system specific.

 *

 * PNG_EXPORT_TYPE(type) A macro that pre or appends PNG_IMPEXP to

 *                       'type', compiler specific.

 *

 * PNG_DLL_EXPORT Set to the magic to use during a libpng build to

 *                make a symbol exported from the DLL.

 *

 * PNG_DLL_IMPORT Set to the magic to force the libpng symbols to come

 *                from a DLL - used to define PNG_IMPEXP when

 *                PNG_USE_DLL is set.

 */

 * ==========================

 * This code is used at build time to find PNG_IMPEXP, the API settings

 * and PNG_EXPORT_TYPE(), it may also set a macro to indicate the DLL

 * import processing is possible.  On Windows/x86 systems it also sets

 * compiler-specific macros to the values required to change the calling

 * conventions of the various functions.

 */

#if ( defined(_Windows) || defined(_WINDOWS) || defined(WIN32) ||\

      defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__) ) &&\

    ( defined(_X86_) || defined(_X64_) || defined(_M_IX86) ||\

      defined(_M_X64) || defined(_M_IA64) )

  /* Windows system (DOS doesn't support DLLs) running on x86/x64.  Includes

   * builds under Cygwin or MinGW.  Also includes Watcom builds but these need

   * special treatment because they are not compatible with GCC or Visual C

   * because of different calling conventions.

   */

#  if PNG_API_RULE == 2

    /* If this line results in an error, either because __watcall is not

     * understood or because of a redefine just below you cannot use *this*

     * build of the library with the compiler you are using.  *This* build was

     * build using Watcom and applications must also be built using Watcom!

     */

#    define PNGCAPI __watcall

#  endif

#    define PNGCAPI __cdecl

#    if PNG_API_RULE == 1

#      define PNGAPI __stdcall

#    endif

#  else

    /* An older compiler, or one not detected (erroneously) above,

     * if necessary override on the command line to get the correct

     * variants for the compiler.

     */

#    ifndef PNGCAPI

#      define PNGCAPI _cdecl

#    endif

#    if PNG_API_RULE == 1 && !defined(PNGAPI)

#      define PNGAPI _stdcall

#    endif

#  endif /* compiler/api */

  /* NOTE: PNGCBAPI always defaults to PNGCAPI. */

   ERROR: PNG_USER_PRIVATEBUILD must be defined if PNGAPI is changed

#  endif

      (defined(__BORLANDC__) && __BORLANDC__ < 0x500)

    /* older Borland and MSC

     * compilers used '__export' and required this to be after

     * the type.

     */

#    ifndef PNG_EXPORT_TYPE

#      define PNG_EXPORT_TYPE(type) type PNG_IMPEXP

#    endif

#    define PNG_DLL_EXPORT __export

#  else /* newer compiler */

#    define PNG_DLL_EXPORT __declspec(dllexport)

#    ifndef PNG_DLL_IMPORT

#      define PNG_DLL_IMPORT __declspec(dllimport)

#    endif

#  endif /* compiler */

#  if (defined(__IBMC__) || defined(__IBMCPP__)) && defined(__OS2__)

#    define PNGAPI _System

#  else /* !Windows/x86 && !OS/2 */

    /* Use the defaults, or define PNG*API on the command line (but

     * this will have to be done for every compile!)

     */

#  endif /* other system, !OS/2 */

#endif /* !Windows/x86 */

#ifndef PNGCAPI

#  define PNGCAPI

#endif

#ifndef PNGCBAPI

#  define PNGCBAPI PNGCAPI

#endif

#ifndef PNGAPI

#  define PNGAPI PNGCAPI

#endif

 * being built or used.

 */

#ifndef PNG_IMPEXP

#  ifdef PNGLIB_BUILD

    /* Building the library */

#    if (defined(DLL_EXPORT)/*from libtool*/ ||\

        defined(_WINDLL) || defined(_DLL) || defined(__DLL__) ||\

        defined(_USRDLL) ||\

        defined(PNG_BUILD_DLL)) && defined(PNG_DLL_EXPORT)

      /* Building a DLL. */

#      define PNG_IMPEXP PNG_DLL_EXPORT

#    endif /* DLL */

#  else

    /* Using the library */

#    if defined(PNG_USE_DLL) && defined(PNG_DLL_IMPORT)

      /* This forces use of a DLL, disallowing static linking */

#      define PNG_IMPEXP PNG_DLL_IMPORT

#    endif

#  endif

#    define PNG_IMPEXP

#  endif

#endif

 * declared function in the correct place.  This potentially requires a separate

 * PNG_EXPORT function for every compiler.

 */

#ifndef PNG_FUNCTION

#  ifdef __GNUC__

#     define PNG_FUNCTION(type, name, args, attributes)\

         attributes type name args

#  else /* !GNUC */

#     ifdef _MSC_VER

#        define PNG_FUNCTION(type, name, args, attributes)\

         attributes type name args

#     else /* !MSC */

#        define PNG_FUNCTION(type, name, args, attributes)\

            type name args

#     endif

#  endif

#endif

#  define PNG_EXPORT_TYPE(type) PNG_IMPEXP type

#endif

    * table entries, so we discard it here.  See the .dfn files in the

    * scripts directory.

    */

#ifndef PNG_EXPORTA

#  define PNG_EXPORTA(ordinal, type, name, args, attributes)\

      extern PNG_FUNCTION(PNG_EXPORT_TYPE(type),(PNGAPI name),PNGARG(args),\

         attributes)

#endif

   PNG_EXPORTA(ordinal, type, name, args, )

#ifndef PNG_REMOVED

#  define PNG_REMOVED(ordinal, type, name, args, attributes)

#endif

#  define PNG_CALLBACK(type, name, args, attributes)\

   type (PNGCBAPI name) PNGARG(args) attributes

#endif

 * 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_PEDANTIC_WARNINGS_SUPPORTED

#    define PNG_PEDANTIC_WARNINGS_SUPPORTED

#  endif

#endif

  /* 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_PTR_NORETURN

#      define PNG_PTR_NORETURN   __attribute__((__noreturn__))

#    endif

#    ifndef PNG_ALLOCATED

#      define PNG_ALLOCATED  __attribute__((__malloc__))

#    endif

     * accessed from within the library, therefore should be empty during

     * a library build.

     */

#    ifndef PNGLIB_BUILD

#      ifndef PNG_DEPRECATED

#        define PNG_DEPRECATED __attribute__((__deprecated__))

#      endif

#      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 /* PNGLIB_BUILD */

#  endif /* __GNUC__ */

#  ifdef _MSC_VER /* may need to check value */

#    ifndef PNG_USE_RESULT

#      define PNG_USE_RESULT /*not supported*/

#    endif

#    ifndef PNG_NORETURN

#      define PNG_NORETURN   __declspec(noreturn)

#    endif

#    ifndef PNG_PTR_NORETURN

#      define PNG_PTR_NORETURN /*not supported*/

#    endif

#    ifndef PNG_ALLOCATED

#      define PNG_ALLOCATED __declspec(restrict)

#    endif

     * accessed from within the library, therefore should be empty during

     * a library build.

     */

#    ifndef PNGLIB_BUILD

#      ifndef PNG_DEPRECATED

#        define PNG_DEPRECATED __declspec(deprecated)

#      endif

#      ifndef PNG_DEPSTRUCT

#        define PNG_DEPSTRUCT  __declspec(deprecated)

#      endif

#      ifndef PNG_PRIVATE

#        define PNG_PRIVATE __declspec(deprecated)

#      endif /* PNG_PRIVATE */

#    endif /* PNGLIB_BUILD */

#  endif /* __GNUC__ */

#endif /* PNG_PEDANTIC_WARNINGS */

#  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

#ifndef PNG_FP_EXPORT     /* A floating point API. */

#  ifdef PNG_FLOATING_POINT_SUPPORTED

#     define PNG_FP_EXPORT(ordinal, type, name, args)\

         PNG_EXPORT(ordinal, type, name, args)

#  else                   /* No floating point APIs */

#     define PNG_FP_EXPORT(ordinal, type, name, args)

#  endif

#endif

#ifndef PNG_FIXED_EXPORT  /* A fixed point API. */

#  ifdef PNG_FIXED_POINT_SUPPORTED

#     define PNG_FIXED_EXPORT(ordinal, type, name, args)\

         PNG_EXPORT(ordinal, type, name, args)

#  else                   /* No fixed point APIs */

#     define PNG_FIXED_EXPORT(ordinal, type, name, args)

#  endif

#endif

 * and warning message functions, so some compilers won't complain.

 * If you do not want to use const, define PNG_NO_CONST here.

 *

 * This should not change how the APIs are called, so it can be done

 * on a per-file basis in the application.

 */

#ifndef PNG_CONST

#  ifndef PNG_NO_CONST

#    define PNG_CONST const

#  else

#    define PNG_CONST

#  endif

#endif

 * 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.

 */

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;

typedef unsigned int png_size_t;

#else

typedef size_t png_size_t;

#endif

#define png_sizeof(x) (sizeof (x))

 * 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)

 */

 * 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 /* only used in build */

#    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__ */

 * FAR.  The Watcom compiler defines both __MEDIUM__ and M_I86MM,

 * making reliance oncertain keywords suspect. (SJT)

 */

#ifdef FAR

#  ifdef M_I86MM

#    define USE_FAR_KEYWORD

#    define FARDATA FAR

#    include 

#  endif

#endif

#ifndef FAR

#  define FAR

#endif

#ifndef FARDATA

#  define FARDATA

#endif

 * to fixed-point with a multiple of 100,000, e.g., gamma

 */

typedef png_int_32 png_fixed_point;

typedef void                      FAR * png_voidp;

typedef PNG_CONST void            FAR * png_const_voidp;

typedef png_byte                  FAR * png_bytep;

typedef PNG_CONST png_byte        FAR * png_const_bytep;

typedef png_uint_32               FAR * png_uint_32p;

typedef PNG_CONST png_uint_32     FAR * png_const_uint_32p;

typedef png_int_32                FAR * png_int_32p;

typedef PNG_CONST png_int_32      FAR * png_const_int_32p;

typedef png_uint_16               FAR * png_uint_16p;

typedef PNG_CONST png_uint_16     FAR * png_const_uint_16p;

typedef png_int_16                FAR * png_int_16p;

typedef PNG_CONST png_int_16      FAR * png_const_int_16p;

typedef char                      FAR * png_charp;

typedef PNG_CONST char            FAR * png_const_charp;

typedef png_fixed_point           FAR * png_fixed_point_p;

typedef PNG_CONST png_fixed_point FAR * png_const_fixed_point_p;

typedef png_size_t                FAR * png_size_tp;

typedef PNG_CONST png_size_t      FAR * png_const_size_tp;

typedef FILE            * png_FILE_p;

#endif

typedef double           FAR * png_doublep;

typedef PNG_CONST double FAR * png_const_doublep;

#endif

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

typedef char            FAR * FAR * FAR * png_charppp;

 * 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