share/png/pngconf.h

   1
   2 /* pngconf.h - machine configurable file for libpng
   3  *
   4  * libpng version 1.6.9 - February 6, 2014
   5  *
   6  * Copyright (c) 1998-2013 Glenn Randers-Pehrson
   7  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
   8  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
   9  *
  10  * This code is released under the libpng license.
  11  * For conditions of distribution and use, see the disclaimer
  12  * and license in png.h
  13  *
  14  */
  15
  16 /* Any machine specific code is near the front of this file, so if you
  17  * are configuring libpng for a machine, you may want to read the section
  18  * starting here down to where it starts to typedef png_color, png_text,
  19  * and png_info.
  20  */
  21
  22 #ifndef PNGCONF_H
  23 #define PNGCONF_H
  24
  25 /* To do: Do all of this in scripts/pnglibconf.dfa */
  26 #ifdef PNG_SAFE_LIMITS_SUPPORTED
  27 #  ifdef PNG_USER_WIDTH_MAX
  28 #    undef PNG_USER_WIDTH_MAX
  29 #    define PNG_USER_WIDTH_MAX 1000000L
  30 #  endif
  31 #  ifdef PNG_USER_HEIGHT_MAX
  32 #    undef PNG_USER_HEIGHT_MAX
  33 #    define PNG_USER_HEIGHT_MAX 1000000L
  34 #  endif
  35 #  ifdef PNG_USER_CHUNK_MALLOC_MAX
  36 #    undef PNG_USER_CHUNK_MALLOC_MAX
  37 #    define PNG_USER_CHUNK_MALLOC_MAX 4000000L
  38 #  endif
  39 #  ifdef PNG_USER_CHUNK_CACHE_MAX
  40 #    undef PNG_USER_CHUNK_CACHE_MAX
  41 #    define PNG_USER_CHUNK_CACHE_MAX 128
  42 #  endif
  43 #endif
  44
  45 #ifndef PNG_BUILDING_SYMBOL_TABLE /* else includes may cause problems */
  46
  47 /* From libpng 1.6.0 libpng requires an ANSI X3.159-1989 ("ISOC90") compliant C
  48  * compiler for correct compilation.  The following header files are required by
  49  * the standard.  If your compiler doesn't provide these header files, or they
  50  * do not match the standard, you will need to provide/improve them.
  51  */
  52 #include <limits.h>
  53 #include <stddef.h>
  54
  55 /* Library header files.  These header files are all defined by ISOC90; libpng
  56  * expects conformant implementations, however, an ISOC90 conformant system need
  57  * not provide these header files if the functionality cannot be implemented.
  58  * In this case it will be necessary to disable the relevant parts of libpng in
  59  * the build of pnglibconf.h.
  60  *
  61  * Prior to 1.6.0 string.h was included here; the API changes in 1.6.0 to not
  62  * include this unnecessary header file.
  63  */
  64
  65 #ifdef PNG_STDIO_SUPPORTED
  66    /* Required for the definition of FILE: */
  67 #  include <stdio.h>
  68 #endif
  69
  70 #ifdef PNG_SETJMP_SUPPORTED
  71    /* Required for the definition of jmp_buf and the declaration of longjmp: */
  72 #  include <setjmp.h>
  73 #endif
  74
  75 #ifdef PNG_CONVERT_tIME_SUPPORTED
  76    /* Required for struct tm: */
  77 #  include <time.h>
  78 #endif
  79
  80 #endif /* PNG_BUILDING_SYMBOL_TABLE */
  81
  82 /* Prior to 1.6.0 it was possible to turn off 'const' in declarations using
  83  * PNG_NO_CONST; this is no longer supported except for data declarations which
  84  * apparently still cause problems in 2011 on some compilers.
  85  */
  86 #define PNG_CONST const /* backward compatibility only */
  87
  88 /* This controls optimization of the reading of 16 and 32 bit values
  89  * from PNG files.  It can be set on a per-app-file basis - it
  90  * just changes whether a macro is used when the function is called.
  91  * The library builder sets the default; if read functions are not
  92  * built into the library the macro implementation is forced on.
  93  */
  94 #ifndef PNG_READ_INT_FUNCTIONS_SUPPORTED
  95 #  define PNG_USE_READ_MACROS
  96 #endif
  97 #if !defined(PNG_NO_USE_READ_MACROS) && !defined(PNG_USE_READ_MACROS)
  98 #  if PNG_DEFAULT_READ_MACROS
  99 #    define PNG_USE_READ_MACROS
 100 #  endif
 101 #endif
 102
 103 /* COMPILER SPECIFIC OPTIONS.
 104  *
 105  * These options are provided so that a variety of difficult compilers
 106  * can be used.  Some are fixed at build time (e.g. PNG_API_RULE
 107  * below) but still have compiler specific implementations, others
 108  * may be changed on a per-file basis when compiling against libpng.
 109  */
 110
 111 /* The PNGARG macro was used in versions of libpng prior to 1.6.0 to protect
 112  * against legacy (pre ISOC90) compilers that did not understand function
 113  * prototypes.  It is not required for modern C compilers.
 114  */
 115 #ifndef PNGARG
 116 #  define PNGARG(arglist) arglist
 117 #endif
 118
 119 /* Function calling conventions.
 120  * =============================
 121  * Normally it is not necessary to specify to the compiler how to call
 122  * a function - it just does it - however on x86 systems derived from
 123  * Microsoft and Borland C compilers ('IBM PC', 'DOS', 'Windows' systems
 124  * and some others) there are multiple ways to call a function and the
 125  * default can be changed on the compiler command line.  For this reason
 126  * libpng specifies the calling convention of every exported function and
 127  * every function called via a user supplied function pointer.  This is
 128  * done in this file by defining the following macros:
 129  *
 130  * PNGAPI    Calling convention for exported functions.
 131  * PNGCBAPI  Calling convention for user provided (callback) functions.
 132  * PNGCAPI   Calling convention used by the ANSI-C library (required
 133  *           for longjmp callbacks and sometimes used internally to
 134  *           specify the calling convention for zlib).
 135  *
 136  * These macros should never be overridden.  If it is necessary to
 137  * change calling convention in a private build this can be done
 138  * by setting PNG_API_RULE (which defaults to 0) to one of the values
 139  * below to select the correct 'API' variants.
 140  *
 141  * PNG_API_RULE=0 Use PNGCAPI - the 'C' calling convention - throughout.
 142  *                This is correct in every known environment.
 143  * PNG_API_RULE=1 Use the operating system convention for PNGAPI and
 144  *                the 'C' calling convention (from PNGCAPI) for
 145  *                callbacks (PNGCBAPI).  This is no longer required
 146  *                in any known environment - if it has to be used
 147  *                please post an explanation of the problem to the
 148  *                libpng mailing list.
 149  *
 150  * These cases only differ if the operating system does not use the C
 151  * calling convention, at present this just means the above cases
 152  * (x86 DOS/Windows sytems) and, even then, this does not apply to
 153  * Cygwin running on those systems.
 154  *
 155  * Note that the value must be defined in pnglibconf.h so that what
 156  * the application uses to call the library matches the conventions
 157  * set when building the library.
 158  */
 159
 160 /* Symbol export
 161  * =============
 162  * When building a shared library it is almost always necessary to tell
 163  * the compiler which symbols to export.  The png.h macro 'PNG_EXPORT'
 164  * is used to mark the symbols.  On some systems these symbols can be
 165  * extracted at link time and need no special processing by the compiler,
 166  * on other systems the symbols are flagged by the compiler and just
 167  * the declaration requires a special tag applied (unfortunately) in a
 168  * compiler dependent way.  Some systems can do either.
 169  *
 170  * A small number of older systems also require a symbol from a DLL to
 171  * be flagged to the program that calls it.  This is a problem because
 172  * we do not know in the header file included by application code that
 173  * the symbol will come from a shared library, as opposed to a statically
 174  * linked one.  For this reason the application must tell us by setting
 175  * the magic flag PNG_USE_DLL to turn on the special processing before
 176  * it includes png.h.
 177  *
 178  * Four additional macros are used to make this happen:
 179  *
 180  * PNG_IMPEXP The magic (if any) to cause a symbol to be exported from
 181  *            the build or imported if PNG_USE_DLL is set - compiler
 182  *            and system specific.
 183  *
 184  * PNG_EXPORT_TYPE(type) A macro that pre or appends PNG_IMPEXP to
 185  *                       'type', compiler specific.
 186  *
 187  * PNG_DLL_EXPORT Set to the magic to use during a libpng build to
 188  *                make a symbol exported from the DLL.  Not used in the
 189  *                public header files; see pngpriv.h for how it is used
 190  *                in the libpng build.
 191  *
 192  * PNG_DLL_IMPORT Set to the magic to force the libpng symbols to come
 193  *                from a DLL - used to define PNG_IMPEXP when
 194  *                PNG_USE_DLL is set.
 195  */
 196
 197 /* System specific discovery.
 198  * ==========================
 199  * This code is used at build time to find PNG_IMPEXP, the API settings
 200  * and PNG_EXPORT_TYPE(), it may also set a macro to indicate the DLL
 201  * import processing is possible.  On Windows systems it also sets
 202  * compiler-specific macros to the values required to change the calling
 203  * conventions of the various functions.
 204  */
 205 #if defined(_Windows) || defined(_WINDOWS) || defined(WIN32) ||\
 206     defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__)
 207   /* Windows system (DOS doesn't support DLLs).  Includes builds under Cygwin or
 208    * MinGW on any architecture currently supported by Windows.  Also includes
 209    * Watcom builds but these need special treatment because they are not
 210    * compatible with GCC or Visual C because of different calling conventions.
 211    */
 212 #  if PNG_API_RULE == 2
 213     /* If this line results in an error, either because __watcall is not
 214      * understood or because of a redefine just below you cannot use *this*
 215      * build of the library with the compiler you are using.  *This* build was
 216      * build using Watcom and applications must also be built using Watcom!
 217      */
 218 #    define PNGCAPI __watcall
 219 #  endif
 220
 221 #  if defined(__GNUC__) || (defined(_MSC_VER) && (_MSC_VER >= 800))
 222 #    define PNGCAPI __cdecl
 223 #    if PNG_API_RULE == 1
 224        /* If this line results in an error __stdcall is not understood and
 225         * PNG_API_RULE should not have been set to '1'.
 226         */
 227 #      define PNGAPI __stdcall
 228 #    endif
 229 #  else
 230     /* An older compiler, or one not detected (erroneously) above,
 231      * if necessary override on the command line to get the correct
 232      * variants for the compiler.
 233      */
 234 #    ifndef PNGCAPI
 235 #      define PNGCAPI _cdecl
 236 #    endif
 237 #    if PNG_API_RULE == 1 && !defined(PNGAPI)
 238 #      define PNGAPI _stdcall
 239 #    endif
 240 #  endif /* compiler/api */
 241
 242   /* NOTE: PNGCBAPI always defaults to PNGCAPI. */
 243
 244 #  if defined(PNGAPI) && !defined(PNG_USER_PRIVATEBUILD)
 245 #     error "PNG_USER_PRIVATEBUILD must be defined if PNGAPI is changed"
 246 #  endif
 247
 248 #  if (defined(_MSC_VER) && _MSC_VER < 800) ||\
 249       (defined(__BORLANDC__) && __BORLANDC__ < 0x500)
 250     /* older Borland and MSC
 251      * compilers used '__export' and required this to be after
 252      * the type.
 253      */
 254 #    ifndef PNG_EXPORT_TYPE
 255 #      define PNG_EXPORT_TYPE(type) type PNG_IMPEXP
 256 #    endif
 257 #    define PNG_DLL_EXPORT __export
 258 #  else /* newer compiler */
 259 #    define PNG_DLL_EXPORT __declspec(dllexport)
 260 #    ifndef PNG_DLL_IMPORT
 261 #      define PNG_DLL_IMPORT __declspec(dllimport)
 262 #    endif
 263 #  endif /* compiler */
 264
 265 #else /* !Windows */
 266 #  if (defined(__IBMC__) || defined(__IBMCPP__)) && defined(__OS2__)
 267 #    define PNGAPI _System
 268 #  else /* !Windows/x86 && !OS/2 */
 269     /* Use the defaults, or define PNG*API on the command line (but
 270      * this will have to be done for every compile!)
 271      */
 272 #  endif /* other system, !OS/2 */
 273 #endif /* !Windows/x86 */
 274
 275 /* Now do all the defaulting . */
 276 #ifndef PNGCAPI
 277 #  define PNGCAPI
 278 #endif
 279 #ifndef PNGCBAPI
 280 #  define PNGCBAPI PNGCAPI
 281 #endif
 282 #ifndef PNGAPI
 283 #  define PNGAPI PNGCAPI
 284 #endif
 285
 286 /* PNG_IMPEXP may be set on the compilation system command line or (if not set)
 287  * then in an internal header file when building the library, otherwise (when
 288  * using the library) it is set here.
 289  */
 290 #ifndef PNG_IMPEXP
 291 #  if defined(PNG_USE_DLL) && defined(PNG_DLL_IMPORT)
 292      /* This forces use of a DLL, disallowing static linking */
 293 #    define PNG_IMPEXP PNG_DLL_IMPORT
 294 #  endif
 295
 296 #  ifndef PNG_IMPEXP
 297 #    define PNG_IMPEXP
 298 #  endif
 299 #endif
 300
 301 /* In 1.5.2 the definition of PNG_FUNCTION has been changed to always treat
 302  * 'attributes' as a storage class - the attributes go at the start of the
 303  * function definition, and attributes are always appended regardless of the
 304  * compiler.  This considerably simplifies these macros but may cause problems
 305  * if any compilers both need function attributes and fail to handle them as
 306  * a storage class (this is unlikely.)
 307  */
 308 #ifndef PNG_FUNCTION
 309 #  define PNG_FUNCTION(type, name, args, attributes) attributes type name args
 310 #endif
 311
 312 #ifndef PNG_EXPORT_TYPE
 313 #  define PNG_EXPORT_TYPE(type) PNG_IMPEXP type
 314 #endif
 315
 316    /* The ordinal value is only relevant when preprocessing png.h for symbol
 317     * table entries, so we discard it here.  See the .dfn files in the
 318     * scripts directory.
 319     */
 320 #ifndef PNG_EXPORTA
 321
 322 #  define PNG_EXPORTA(ordinal, type, name, args, attributes)\
 323       PNG_FUNCTION(PNG_EXPORT_TYPE(type),(PNGAPI name),PNGARG(args), \
 324         extern attributes)
 325 #endif
 326
 327 /* ANSI-C (C90) does not permit a macro to be invoked with an empty argument,
 328  * so make something non-empty to satisfy the requirement:
 329  */
 330 #define PNG_EMPTY /*empty list*/
 331
 332 #define PNG_EXPORT(ordinal, type, name, args)\
 333    PNG_EXPORTA(ordinal, type, name, args, PNG_EMPTY)
 334
 335 /* Use PNG_REMOVED to comment out a removed interface. */
 336 #ifndef PNG_REMOVED
 337 #  define PNG_REMOVED(ordinal, type, name, args, attributes)
 338 #endif
 339
 340 #ifndef PNG_CALLBACK
 341 #  define PNG_CALLBACK(type, name, args) type (PNGCBAPI name) PNGARG(args)
 342 #endif
 343
 344 /* Support for compiler specific function attributes.  These are used
 345  * so that where compiler support is available incorrect use of API
 346  * functions in png.h will generate compiler warnings.
 347  *
 348  * Added at libpng-1.2.41.
 349  */
 350
 351 #ifndef PNG_NO_PEDANTIC_WARNINGS
 352 #  ifndef PNG_PEDANTIC_WARNINGS_SUPPORTED
 353 #    define PNG_PEDANTIC_WARNINGS_SUPPORTED
 354 #  endif
 355 #endif
 356
 357 #ifdef PNG_PEDANTIC_WARNINGS_SUPPORTED
 358   /* Support for compiler specific function attributes.  These are used
 359    * so that where compiler support is available, incorrect use of API
 360    * functions in png.h will generate compiler warnings.  Added at libpng
 361    * version 1.2.41.  Disabling these removes the warnings but may also produce
 362    * less efficient code.
 363    */
 364 #  if defined(__clang__)
 365      /* Clang defines both __clang__ and __GNUC__. Check __clang__ first. */
 366 #    if !defined(PNG_USE_RESULT) && __has_attribute(__warn_unused_result__)
 367 #      define PNG_USE_RESULT __attribute__((__warn_unused_result__))
 368 #    endif
 369 #    if !defined(PNG_NORETURN) && __has_attribute(__noreturn__)
 370 #      define PNG_NORETURN __attribute__((__noreturn__))
 371 #    endif
 372 #    if !defined(PNG_ALLOCATED) && __has_attribute(__malloc__)
 373 #      define PNG_ALLOCATED __attribute__((__malloc__))
 374 #    endif
 375 #    if !defined(PNG_DEPRECATED) && __has_attribute(__deprecated__)
 376 #      define PNG_DEPRECATED __attribute__((__deprecated__))
 377 #    endif
 378 #    if !defined(PNG_PRIVATE)
 379 #      if __has_extension(attribute_unavailable_with_message)
 380 #        define PNG_PRIVATE __attribute__((__unavailable__(\
 381            "This function is not exported by libpng.")))
 382 #      endif
 383 #    endif
 384 #    ifndef PNG_RESTRICT
 385 #      define PNG_RESTRICT __restrict
 386 #    endif
 387
 388 #  elif defined(__GNUC__)
 389 #    ifndef PNG_USE_RESULT
 390 #      define PNG_USE_RESULT __attribute__((__warn_unused_result__))
 391 #    endif
 392 #    ifndef PNG_NORETURN
 393 #      define PNG_NORETURN   __attribute__((__noreturn__))
 394 #    endif
 395 #    if __GNUC__ >= 3
 396 #      ifndef PNG_ALLOCATED
 397 #        define PNG_ALLOCATED  __attribute__((__malloc__))
 398 #      endif
 399 #      ifndef PNG_DEPRECATED
 400 #        define PNG_DEPRECATED __attribute__((__deprecated__))
 401 #      endif
 402 #      ifndef PNG_PRIVATE
 403 #        if 0 /* Doesn't work so we use deprecated instead*/
 404 #          define PNG_PRIVATE \
 405             __attribute__((warning("This function is not exported by libpng.")))
 406 #        else
 407 #          define PNG_PRIVATE \
 408             __attribute__((__deprecated__))
 409 #        endif
 410 #      endif
 411 #      if ((__GNUC__ > 3) || !defined(__GNUC_MINOR__) || (__GNUC_MINOR__ >= 1))
 412 #        ifndef PNG_RESTRICT
 413 #          define PNG_RESTRICT __restrict
 414 #        endif
 415 #      endif /* __GNUC__.__GNUC_MINOR__ > 3.0 */
 416 #    endif /* __GNUC__ >= 3 */
 417
 418 #  elif defined(_MSC_VER)  && (_MSC_VER >= 1300)
 419 #    ifndef PNG_USE_RESULT
 420 #      define PNG_USE_RESULT /* not supported */
 421 #    endif
 422 #    ifndef PNG_NORETURN
 423 #      define PNG_NORETURN   __declspec(noreturn)
 424 #    endif
 425 #    ifndef PNG_ALLOCATED
 426 #      if (_MSC_VER >= 1400)
 427 #        define PNG_ALLOCATED __declspec(restrict)
 428 #      endif
 429 #    endif
 430 #    ifndef PNG_DEPRECATED
 431 #      define PNG_DEPRECATED __declspec(deprecated)
 432 #    endif
 433 #    ifndef PNG_PRIVATE
 434 #      define PNG_PRIVATE __declspec(deprecated)
 435 #    endif
 436 #    ifndef PNG_RESTRICT
 437 #      if (_MSC_VER >= 1400)
 438 #        define PNG_RESTRICT __restrict
 439 #      endif
 440 #    endif
 441
 442 #  elif defined(__WATCOMC__)
 443 #    ifndef PNG_RESTRICT
 444 #      define PNG_RESTRICT __restrict
 445 #    endif
 446 #  endif
 447 #endif /* PNG_PEDANTIC_WARNINGS */
 448
 449 #ifndef PNG_DEPRECATED
 450 #  define PNG_DEPRECATED  /* Use of this function is deprecated */
 451 #endif
 452 #ifndef PNG_USE_RESULT
 453 #  define PNG_USE_RESULT  /* The result of this function must be checked */
 454 #endif
 455 #ifndef PNG_NORETURN
 456 #  define PNG_NORETURN    /* This function does not return */
 457 #endif
 458 #ifndef PNG_ALLOCATED
 459 #  define PNG_ALLOCATED   /* The result of the function is new memory */
 460 #endif
 461 #ifndef PNG_PRIVATE
 462 #  define PNG_PRIVATE     /* This is a private libpng function */
 463 #endif
 464 #ifndef PNG_RESTRICT
 465 #  define PNG_RESTRICT    /* The C99 "restrict" feature */
 466 #endif
 467
 468 #ifndef PNG_FP_EXPORT     /* A floating point API. */
 469 #  ifdef PNG_FLOATING_POINT_SUPPORTED
 470 #     define PNG_FP_EXPORT(ordinal, type, name, args)\
 471          PNG_EXPORT(ordinal, type, name, args);
 472 #  else                   /* No floating point APIs */
 473 #     define PNG_FP_EXPORT(ordinal, type, name, args)
 474 #  endif
 475 #endif
 476 #ifndef PNG_FIXED_EXPORT  /* A fixed point API. */
 477 #  ifdef PNG_FIXED_POINT_SUPPORTED
 478 #     define PNG_FIXED_EXPORT(ordinal, type, name, args)\
 479          PNG_EXPORT(ordinal, type, name, args);
 480 #  else                   /* No fixed point APIs */
 481 #     define PNG_FIXED_EXPORT(ordinal, type, name, args)
 482 #  endif
 483 #endif
 484
 485 #ifndef PNG_BUILDING_SYMBOL_TABLE
 486 /* Some typedefs to get us started.  These should be safe on most of the common
 487  * platforms.
 488  *
 489  * png_uint_32 and png_int_32 may, currently, be larger than required to hold a
 490  * 32-bit value however this is not normally advisable.
 491  *
 492  * png_uint_16 and png_int_16 should always be two bytes in size - this is
 493  * verified at library build time.
 494  *
 495  * png_byte must always be one byte in size.
 496  *
 497  * The checks below use constants from limits.h, as defined by the ISOC90
 498  * standard.
 499  */
 500 #if CHAR_BIT == 8 && UCHAR_MAX == 255
 501    typedef unsigned char png_byte;
 502 #else
 503 #  error "libpng requires 8 bit bytes"
 504 #endif
 505
 506 #if INT_MIN == -32768 && INT_MAX == 32767
 507    typedef int png_int_16;
 508 #elif SHRT_MIN == -32768 && SHRT_MAX == 32767
 509    typedef short png_int_16;
 510 #else
 511 #  error "libpng requires a signed 16 bit type"
 512 #endif
 513
 514 #if UINT_MAX == 65535
 515    typedef unsigned int png_uint_16;
 516 #elif USHRT_MAX == 65535
 517    typedef unsigned short png_uint_16;
 518 #else
 519 #  error "libpng requires an unsigned 16 bit type"
 520 #endif
 521
 522 #if INT_MIN < -2147483646 && INT_MAX > 2147483646
 523    typedef int png_int_32;
 524 #elif LONG_MIN < -2147483646 && LONG_MAX > 2147483646
 525    typedef long int png_int_32;
 526 #else
 527 #  error "libpng requires a signed 32 bit (or more) type"
 528 #endif
 529
 530 #if UINT_MAX > 4294967294
 531    typedef unsigned int png_uint_32;
 532 #elif ULONG_MAX > 4294967294
 533    typedef unsigned long int png_uint_32;
 534 #else
 535 #  error "libpng requires an unsigned 32 bit (or more) type"
 536 #endif
 537
 538 /* Prior to 1.6.0 it was possible to disable the use of size_t, 1.6.0, however,
 539  * requires an ISOC90 compiler and relies on consistent behavior of sizeof.
 540  */
 541 typedef size_t png_size_t;
 542 typedef ptrdiff_t png_ptrdiff_t;
 543
 544 /* libpng needs to know the maximum value of 'size_t' and this controls the
 545  * definition of png_alloc_size_t, below.  This maximum value of size_t limits
 546  * but does not control the maximum allocations the library makes - there is
 547  * direct application control of this through png_set_user_limits().
 548  */
 549 #ifndef PNG_SMALL_SIZE_T
 550    /* Compiler specific tests for systems where size_t is known to be less than
 551     * 32 bits (some of these systems may no longer work because of the lack of
 552     * 'far' support; see above.)
 553     */
 554 #  if (defined(__TURBOC__) && !defined(__FLAT__)) ||\
 555    (defined(_MSC_VER) && defined(MAXSEG_64K))
 556 #     define PNG_SMALL_SIZE_T
 557 #  endif
 558 #endif
 559
 560 /* png_alloc_size_t is guaranteed to be no smaller than png_size_t, and no
 561  * smaller than png_uint_32.  Casts from png_size_t or png_uint_32 to
 562  * png_alloc_size_t are not necessary; in fact, it is recommended not to use
 563  * them at all so that the compiler can complain when something turns out to be
 564  * problematic.
 565  *
 566  * Casts in the other direction (from png_alloc_size_t to png_size_t or
 567  * png_uint_32) should be explicitly applied; however, we do not expect to
 568  * encounter practical situations that require such conversions.
 569  *
 570  * PNG_SMALL_SIZE_T must be defined if the maximum value of size_t is less than
 571  * 4294967295 - i.e. less than the maximum value of png_uint_32.
 572  */
 573 #ifdef PNG_SMALL_SIZE_T
 574    typedef png_uint_32 png_alloc_size_t;
 575 #else
 576    typedef png_size_t png_alloc_size_t;
 577 #endif
 578
 579 /* Prior to 1.6.0 libpng offered limited support for Microsoft C compiler
 580  * implementations of Intel CPU specific support of user-mode segmented address
 581  * spaces, where 16-bit pointers address more than 65536 bytes of memory using
 582  * separate 'segment' registers.  The implementation requires two different
 583  * types of pointer (only one of which includes the segment value.)
 584  *
 585  * If required this support is available in version 1.2 of libpng and may be
 586  * available in versions through 1.5, although the correctness of the code has
 587  * not been verified recently.
 588  */
 589
 590 /* Typedef for floating-point numbers that are converted to fixed-point with a
 591  * multiple of 100,000, e.g., gamma
 592  */
 593 typedef png_int_32 png_fixed_point;
 594
 595 /* Add typedefs for pointers */
 596 typedef void                  * png_voidp;
 597 typedef const void            * png_const_voidp;
 598 typedef png_byte              * png_bytep;
 599 typedef const png_byte        * png_const_bytep;
 600 typedef png_uint_32           * png_uint_32p;
 601 typedef const png_uint_32     * png_const_uint_32p;
 602 typedef png_int_32            * png_int_32p;
 603 typedef const png_int_32      * png_const_int_32p;
 604 typedef png_uint_16           * png_uint_16p;
 605 typedef const png_uint_16     * png_const_uint_16p;
 606 typedef png_int_16            * png_int_16p;
 607 typedef const png_int_16      * png_const_int_16p;
 608 typedef char                  * png_charp;
 609 typedef const char            * png_const_charp;
 610 typedef png_fixed_point       * png_fixed_point_p;
 611 typedef const png_fixed_point * png_const_fixed_point_p;
 612 typedef png_size_t            * png_size_tp;
 613 typedef const png_size_t      * png_const_size_tp;
 614
 615 #ifdef PNG_STDIO_SUPPORTED
 616 typedef FILE            * png_FILE_p;
 617 #endif
 618
 619 #ifdef PNG_FLOATING_POINT_SUPPORTED
 620 typedef double       * png_doublep;
 621 typedef const double * png_const_doublep;
 622 #endif
 623
 624 /* Pointers to pointers; i.e. arrays */
 625 typedef png_byte        * * png_bytepp;
 626 typedef png_uint_32     * * png_uint_32pp;
 627 typedef png_int_32      * * png_int_32pp;
 628 typedef png_uint_16     * * png_uint_16pp;
 629 typedef png_int_16      * * png_int_16pp;
 630 typedef const char      * * png_const_charpp;
 631 typedef char            * * png_charpp;
 632 typedef png_fixed_point * * png_fixed_point_pp;
 633 #ifdef PNG_FLOATING_POINT_SUPPORTED
 634 typedef double          * * png_doublepp;
 635 #endif
 636
 637 /* Pointers to pointers to pointers; i.e., pointer to array */
 638 typedef char            * * * png_charppp;
 639
 640 #endif /* PNG_BUILDING_SYMBOL_TABLE */
 641
 642 #endif /* PNGCONF_H */