libs/png/pngconf.h

   1
   2 /* pngconf.h - machine-configurable file for libpng
   3  *
   4  * libpng version 1.6.37
   5  *
   6  * Copyright (c) 2018-2019 Cosmin Truta
   7  * Copyright (c) 1998-2002,2004,2006-2016,2018 Glenn Randers-Pehrson
   8  * Copyright (c) 1996-1997 Andreas Dilger
   9  * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
  10  *
  11  * This code is released under the libpng license.
  12  * For conditions of distribution and use, see the disclaimer
  13  * and license in png.h
  14  *
  15  * Any machine specific code is near the front of this file, so if you
  16  * are configuring libpng for a machine, you may want to read the section
  17  * starting here down to where it starts to typedef png_color, png_text,
  18  * and png_info.
  19  */
  20
  21 #ifndef PNGCONF_H
  22 #define PNGCONF_H
  23
  24 #ifndef PNG_BUILDING_SYMBOL_TABLE /* else includes may cause problems */
  25
  26 /* From libpng 1.6.0 libpng requires an ANSI X3.159-1989 ("ISOC90") compliant C
  27  * compiler for correct compilation.  The following header files are required by
  28  * the standard.  If your compiler doesn't provide these header files, or they
  29  * do not match the standard, you will need to provide/improve them.
  30  */
  31 #include <limits.h>
  32 #include <stddef.h>
  33
  34 /* Library header files.  These header files are all defined by ISOC90; libpng
  35  * expects conformant implementations, however, an ISOC90 conformant system need
  36  * not provide these header files if the functionality cannot be implemented.
  37  * In this case it will be necessary to disable the relevant parts of libpng in
  38  * the build of pnglibconf.h.
  39  *
  40  * Prior to 1.6.0 string.h was included here; the API changes in 1.6.0 to not
  41  * include this unnecessary header file.
  42  */
  43
  44 #ifdef PNG_STDIO_SUPPORTED
  45    /* Required for the definition of FILE: */
  46 #  include <stdio.h>
  47 #endif
  48
  49 #ifdef PNG_SETJMP_SUPPORTED
  50    /* Required for the definition of jmp_buf and the declaration of longjmp: */
  51 #  include <setjmp.h>
  52 #endif
  53
  54 #ifdef PNG_CONVERT_tIME_SUPPORTED
  55    /* Required for struct tm: */
  56 #  include <time.h>
  57 #endif
  58
  59 #endif /* PNG_BUILDING_SYMBOL_TABLE */
  60
  61 /* Prior to 1.6.0, it was possible to turn off 'const' in declarations,
  62  * using PNG_NO_CONST.  This is no longer supported.
  63  */
  64 #define PNG_CONST const /* backward compatibility only */
  65
  66 /* This controls optimization of the reading of 16-bit and 32-bit
  67  * values from PNG files.  It can be set on a per-app-file basis: it
  68  * just changes whether a macro is used when the function is called.
  69  * The library builder sets the default; if read functions are not
  70  * built into the library the macro implementation is forced on.
  71  */
  72 #ifndef PNG_READ_INT_FUNCTIONS_SUPPORTED
  73 #  define PNG_USE_READ_MACROS
  74 #endif
  75 #if !defined(PNG_NO_USE_READ_MACROS) && !defined(PNG_USE_READ_MACROS)
  76 #  if PNG_DEFAULT_READ_MACROS
  77 #    define PNG_USE_READ_MACROS
  78 #  endif
  79 #endif
  80
  81 /* COMPILER SPECIFIC OPTIONS.
  82  *
  83  * These options are provided so that a variety of difficult compilers
  84  * can be used.  Some are fixed at build time (e.g. PNG_API_RULE
  85  * below) but still have compiler specific implementations, others
  86  * may be changed on a per-file basis when compiling against libpng.
  87  */
  88
  89 /* The PNGARG macro was used in versions of libpng prior to 1.6.0 to protect
  90  * against legacy (pre ISOC90) compilers that did not understand function
  91  * prototypes.  It is not required for modern C compilers.
  92  */
  93 #ifndef PNGARG
  94 #  define PNGARG(arglist) arglist
  95 #endif
  96
  97 /* Function calling conventions.
  98  * =============================
  99  * Normally it is not necessary to specify to the compiler how to call
 100  * a function - it just does it - however on x86 systems derived from
 101  * Microsoft and Borland C compilers ('IBM PC', 'DOS', 'Windows' systems
 102  * and some others) there are multiple ways to call a function and the
 103  * default can be changed on the compiler command line.  For this reason
 104  * libpng specifies the calling convention of every exported function and
 105  * every function called via a user supplied function pointer.  This is
 106  * done in this file by defining the following macros:
 107  *
 108  * PNGAPI    Calling convention for exported functions.
 109  * PNGCBAPI  Calling convention for user provided (callback) functions.
 110  * PNGCAPI   Calling convention used by the ANSI-C library (required
 111  *           for longjmp callbacks and sometimes used internally to
 112  *           specify the calling convention for zlib).
 113  *
 114  * These macros should never be overridden.  If it is necessary to
 115  * change calling convention in a private build this can be done
 116  * by setting PNG_API_RULE (which defaults to 0) to one of the values
 117  * below to select the correct 'API' variants.
 118  *
 119  * PNG_API_RULE=0 Use PNGCAPI - the 'C' calling convention - throughout.
 120  *                This is correct in every known environment.
 121  * PNG_API_RULE=1 Use the operating system convention for PNGAPI and
 122  *                the 'C' calling convention (from PNGCAPI) for
 123  *                callbacks (PNGCBAPI).  This is no longer required
 124  *                in any known environment - if it has to be used
 125  *                please post an explanation of the problem to the
 126  *                libpng mailing list.
 127  *
 128  * These cases only differ if the operating system does not use the C
 129  * calling convention, at present this just means the above cases
 130  * (x86 DOS/Windows systems) and, even then, this does not apply to
 131  * Cygwin running on those systems.
 132  *
 133  * Note that the value must be defined in pnglibconf.h so that what
 134  * the application uses to call the library matches the conventions
 135  * set when building the library.
 136  */
 137
 138 /* Symbol export
 139  * =============
 140  * When building a shared library it is almost always necessary to tell
 141  * the compiler which symbols to export.  The png.h macro 'PNG_EXPORT'
 142  * is used to mark the symbols.  On some systems these symbols can be
 143  * extracted at link time and need no special processing by the compiler,
 144  * on other systems the symbols are flagged by the compiler and just
 145  * the declaration requires a special tag applied (unfortunately) in a
 146  * compiler dependent way.  Some systems can do either.
 147  *
 148  * A small number of older systems also require a symbol from a DLL to
 149  * be flagged to the program that calls it.  This is a problem because
 150  * we do not know in the header file included by application code that
 151  * the symbol will come from a shared library, as opposed to a statically
 152  * linked one.  For this reason the application must tell us by setting
 153  * the magic flag PNG_USE_DLL to turn on the special processing before
 154  * it includes png.h.
 155  *
 156  * Four additional macros are used to make this happen:
 157  *
 158  * PNG_IMPEXP The magic (if any) to cause a symbol to be exported from
 159  *            the build or imported if PNG_USE_DLL is set - compiler
 160  *            and system specific.
 161  *
 162  * PNG_EXPORT_TYPE(type) A macro that pre or appends PNG_IMPEXP to
 163  *                       'type', compiler specific.
 164  *
 165  * PNG_DLL_EXPORT Set to the magic to use during a libpng build to
 166  *                make a symbol exported from the DLL.  Not used in the
 167  *                public header files; see pngpriv.h for how it is used
 168  *                in the libpng build.
 169  *
 170  * PNG_DLL_IMPORT Set to the magic to force the libpng symbols to come
 171  *                from a DLL - used to define PNG_IMPEXP when
 172  *                PNG_USE_DLL is set.
 173  */
 174
 175 /* System specific discovery.
 176  * ==========================
 177  * This code is used at build time to find PNG_IMPEXP, the API settings
 178  * and PNG_EXPORT_TYPE(), it may also set a macro to indicate the DLL
 179  * import processing is possible.  On Windows systems it also sets
 180  * compiler-specific macros to the values required to change the calling
 181  * conventions of the various functions.
 182  */
 183 #if defined(_Windows) || defined(_WINDOWS) || defined(WIN32) ||\
 184     defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__)
 185   /* Windows system (DOS doesn't support DLLs).  Includes builds under Cygwin or
 186    * MinGW on any architecture currently supported by Windows.  Also includes
 187    * Watcom builds but these need special treatment because they are not
 188    * compatible with GCC or Visual C because of different calling conventions.
 189    */
 190 #  if PNG_API_RULE == 2
 191    /* If this line results in an error, either because __watcall is not
 192     * understood or because of a redefine just below you cannot use *this*
 193     * build of the library with the compiler you are using.  *This* build was
 194     * build using Watcom and applications must also be built using Watcom!
 195     */
 196 #    define PNGCAPI __watcall
 197 #  endif
 198
 199 #  if defined(__GNUC__) || (defined(_MSC_VER) && (_MSC_VER >= 800))
 200 #    define PNGCAPI __cdecl
 201 #    if PNG_API_RULE == 1
 202    /* If this line results in an error __stdcall is not understood and
 203     * PNG_API_RULE should not have been set to '1'.
 204     */
 205 #      define PNGAPI __stdcall
 206 #    endif
 207 #  else
 208    /* An older compiler, or one not detected (erroneously) above,
 209     * if necessary override on the command line to get the correct
 210     * variants for the compiler.
 211     */
 212 #    ifndef PNGCAPI
 213 #      define PNGCAPI _cdecl
 214 #    endif
 215 #    if PNG_API_RULE == 1 && !defined(PNGAPI)
 216 #      define PNGAPI _stdcall
 217 #    endif
 218 #  endif /* compiler/api */
 219
 220   /* NOTE: PNGCBAPI always defaults to PNGCAPI. */
 221
 222 #  if defined(PNGAPI) && !defined(PNG_USER_PRIVATEBUILD)
 223 #     error "PNG_USER_PRIVATEBUILD must be defined if PNGAPI is changed"
 224 #  endif
 225
 226 #  if (defined(_MSC_VER) && _MSC_VER < 800) ||\
 227       (defined(__BORLANDC__) && __BORLANDC__ < 0x500)
 228    /* older Borland and MSC
 229     * compilers used '__export' and required this to be after
 230     * the type.
 231     */
 232 #    ifndef PNG_EXPORT_TYPE
 233 #      define PNG_EXPORT_TYPE(type) type PNG_IMPEXP
 234 #    endif
 235 #    define PNG_DLL_EXPORT __export
 236 #  else /* newer compiler */
 237 #    define PNG_DLL_EXPORT __declspec(dllexport)
 238 #    ifndef PNG_DLL_IMPORT
 239 #      define PNG_DLL_IMPORT __declspec(dllimport)
 240 #    endif
 241 #  endif /* compiler */
 242
 243 #else /* !Windows */
 244 #  if (defined(__IBMC__) || defined(__IBMCPP__)) && defined(__OS2__)
 245 #    define PNGAPI _System
 246 #  else /* !Windows/x86 && !OS/2 */
 247    /* Use the defaults, or define PNG*API on the command line (but
 248     * this will have to be done for every compile!)
 249     */
 250 #  endif /* other system, !OS/2 */
 251 #endif /* !Windows/x86 */
 252
 253 /* Now do all the defaulting . */
 254 #ifndef PNGCAPI
 255 #  define PNGCAPI
 256 #endif
 257 #ifndef PNGCBAPI
 258 #  define PNGCBAPI PNGCAPI
 259 #endif
 260 #ifndef PNGAPI
 261 #  define PNGAPI PNGCAPI
 262 #endif
 263
 264 /* PNG_IMPEXP may be set on the compilation system command line or (if not set)
 265  * then in an internal header file when building the library, otherwise (when
 266  * using the library) it is set here.
 267  */
 268 #ifndef PNG_IMPEXP
 269 #  if defined(PNG_USE_DLL) && defined(PNG_DLL_IMPORT)
 270    /* This forces use of a DLL, disallowing static linking */
 271 #    define PNG_IMPEXP PNG_DLL_IMPORT
 272 #  endif
 273
 274 #  ifndef PNG_IMPEXP
 275 #    define PNG_IMPEXP
 276 #  endif
 277 #endif
 278
 279 /* In 1.5.2 the definition of PNG_FUNCTION has been changed to always treat
 280  * 'attributes' as a storage class - the attributes go at the start of the
 281  * function definition, and attributes are always appended regardless of the
 282  * compiler.  This considerably simplifies these macros but may cause problems
 283  * if any compilers both need function attributes and fail to handle them as
 284  * a storage class (this is unlikely.)
 285  */
 286 #ifndef PNG_FUNCTION
 287 #  define PNG_FUNCTION(type, name, args, attributes) attributes type name args
 288 #endif
 289
 290 #ifndef PNG_EXPORT_TYPE
 291 #  define PNG_EXPORT_TYPE(type) PNG_IMPEXP type
 292 #endif
 293
 294    /* The ordinal value is only relevant when preprocessing png.h for symbol
 295     * table entries, so we discard it here.  See the .dfn files in the
 296     * scripts directory.
 297     */
 298
 299 #ifndef PNG_EXPORTA
 300 #  define PNG_EXPORTA(ordinal, type, name, args, attributes) \
 301       PNG_FUNCTION(PNG_EXPORT_TYPE(type), (PNGAPI name), PNGARG(args), \
 302       PNG_LINKAGE_API attributes)
 303 #endif
 304
 305 /* ANSI-C (C90) does not permit a macro to be invoked with an empty argument,
 306  * so make something non-empty to satisfy the requirement:
 307  */
 308 #define PNG_EMPTY /*empty list*/
 309
 310 #define PNG_EXPORT(ordinal, type, name, args) \
 311    PNG_EXPORTA(ordinal, type, name, args, PNG_EMPTY)
 312
 313 /* Use PNG_REMOVED to comment out a removed interface. */
 314 #ifndef PNG_REMOVED
 315 #  define PNG_REMOVED(ordinal, type, name, args, attributes)
 316 #endif
 317
 318 #ifndef PNG_CALLBACK
 319 #  define PNG_CALLBACK(type, name, args) type (PNGCBAPI name) PNGARG(args)
 320 #endif
 321
 322 /* Support for compiler specific function attributes.  These are used
 323  * so that where compiler support is available incorrect use of API
 324  * functions in png.h will generate compiler warnings.
 325  *
 326  * Added at libpng-1.2.41.
 327  */
 328
 329 #ifndef PNG_NO_PEDANTIC_WARNINGS
 330 #  ifndef PNG_PEDANTIC_WARNINGS_SUPPORTED
 331 #    define PNG_PEDANTIC_WARNINGS_SUPPORTED
 332 #  endif
 333 #endif
 334
 335 #ifdef PNG_PEDANTIC_WARNINGS_SUPPORTED
 336   /* Support for compiler specific function attributes.  These are used
 337    * so that where compiler support is available, incorrect use of API
 338    * functions in png.h will generate compiler warnings.  Added at libpng
 339    * version 1.2.41.  Disabling these removes the warnings but may also produce
 340    * less efficient code.
 341    */
 342 #  if defined(__clang__) && defined(__has_attribute)
 343    /* Clang defines both __clang__ and __GNUC__. Check __clang__ first. */
 344 #    if !defined(PNG_USE_RESULT) && __has_attribute(__warn_unused_result__)
 345 #      define PNG_USE_RESULT __attribute__((__warn_unused_result__))
 346 #    endif
 347 #    if !defined(PNG_NORETURN) && __has_attribute(__noreturn__)
 348 #      define PNG_NORETURN __attribute__((__noreturn__))
 349 #    endif
 350 #    if !defined(PNG_ALLOCATED) && __has_attribute(__malloc__)
 351 #      define PNG_ALLOCATED __attribute__((__malloc__))
 352 #    endif
 353 #    if !defined(PNG_DEPRECATED) && __has_attribute(__deprecated__)
 354 #      define PNG_DEPRECATED __attribute__((__deprecated__))
 355 #    endif
 356 #    if !defined(PNG_PRIVATE)
 357 #      ifdef __has_extension
 358 #        if __has_extension(attribute_unavailable_with_message)
 359 #          define PNG_PRIVATE __attribute__((__unavailable__(\
 360              "This function is not exported by libpng.")))
 361 #        endif
 362 #      endif
 363 #    endif
 364 #    ifndef PNG_RESTRICT
 365 #      define PNG_RESTRICT __restrict
 366 #    endif
 367
 368 #  elif defined(__GNUC__)
 369 #    ifndef PNG_USE_RESULT
 370 #      define PNG_USE_RESULT __attribute__((__warn_unused_result__))
 371 #    endif
 372 #    ifndef PNG_NORETURN
 373 #      define PNG_NORETURN   __attribute__((__noreturn__))
 374 #    endif
 375 #    if __GNUC__ >= 3
 376 #      ifndef PNG_ALLOCATED
 377 #        define PNG_ALLOCATED  __attribute__((__malloc__))
 378 #      endif
 379 #      ifndef PNG_DEPRECATED
 380 #        define PNG_DEPRECATED __attribute__((__deprecated__))
 381 #      endif
 382 #      ifndef PNG_PRIVATE
 383 #        if 0 /* Doesn't work so we use deprecated instead*/
 384 #          define PNG_PRIVATE \
 385             __attribute__((warning("This function is not exported by libpng.")))
 386 #        else
 387 #          define PNG_PRIVATE \
 388             __attribute__((__deprecated__))
 389 #        endif
 390 #      endif
 391 #      if ((__GNUC__ > 3) || !defined(__GNUC_MINOR__) || (__GNUC_MINOR__ >= 1))
 392 #        ifndef PNG_RESTRICT
 393 #          define PNG_RESTRICT __restrict
 394 #        endif
 395 #      endif /* __GNUC__.__GNUC_MINOR__ > 3.0 */
 396 #    endif /* __GNUC__ >= 3 */
 397
 398 #  elif defined(_MSC_VER)  && (_MSC_VER >= 1300)
 399 #    ifndef PNG_USE_RESULT
 400 #      define PNG_USE_RESULT /* not supported */
 401 #    endif
 402 #    ifndef PNG_NORETURN
 403 #      define PNG_NORETURN   __declspec(noreturn)
 404 #    endif
 405 #    ifndef PNG_ALLOCATED
 406 #      if (_MSC_VER >= 1400)
 407 #        define PNG_ALLOCATED __declspec(restrict)
 408 #      endif
 409 #    endif
 410 #    ifndef PNG_DEPRECATED
 411 #      define PNG_DEPRECATED __declspec(deprecated)
 412 #    endif
 413 #    ifndef PNG_PRIVATE
 414 #      define PNG_PRIVATE __declspec(deprecated)
 415 #    endif
 416 #    ifndef PNG_RESTRICT
 417 #      if (_MSC_VER >= 1400)
 418 #        define PNG_RESTRICT __restrict
 419 #      endif
 420 #    endif
 421
 422 #  elif defined(__WATCOMC__)
 423 #    ifndef PNG_RESTRICT
 424 #      define PNG_RESTRICT __restrict
 425 #    endif
 426 #  endif
 427 #endif /* PNG_PEDANTIC_WARNINGS */
 428
 429 #ifndef PNG_DEPRECATED
 430 #  define PNG_DEPRECATED  /* Use of this function is deprecated */
 431 #endif
 432 #ifndef PNG_USE_RESULT
 433 #  define PNG_USE_RESULT  /* The result of this function must be checked */
 434 #endif
 435 #ifndef PNG_NORETURN
 436 #  define PNG_NORETURN    /* This function does not return */
 437 #endif
 438 #ifndef PNG_ALLOCATED
 439 #  define PNG_ALLOCATED   /* The result of the function is new memory */
 440 #endif
 441 #ifndef PNG_PRIVATE
 442 #  define PNG_PRIVATE     /* This is a private libpng function */
 443 #endif
 444 #ifndef PNG_RESTRICT
 445 #  define PNG_RESTRICT    /* The C99 "restrict" feature */
 446 #endif
 447
 448 #ifndef PNG_FP_EXPORT     /* A floating point API. */
 449 #  ifdef PNG_FLOATING_POINT_SUPPORTED
 450 #     define PNG_FP_EXPORT(ordinal, type, name, args)\
 451          PNG_EXPORT(ordinal, type, name, args);
 452 #  else                   /* No floating point APIs */
 453 #     define PNG_FP_EXPORT(ordinal, type, name, args)
 454 #  endif
 455 #endif
 456 #ifndef PNG_FIXED_EXPORT  /* A fixed point API. */
 457 #  ifdef PNG_FIXED_POINT_SUPPORTED
 458 #     define PNG_FIXED_EXPORT(ordinal, type, name, args)\
 459          PNG_EXPORT(ordinal, type, name, args);
 460 #  else                   /* No fixed point APIs */
 461 #     define PNG_FIXED_EXPORT(ordinal, type, name, args)
 462 #  endif
 463 #endif
 464
 465 #ifndef PNG_BUILDING_SYMBOL_TABLE
 466 /* Some typedefs to get us started.  These should be safe on most of the common
 467  * platforms.
 468  *
 469  * png_uint_32 and png_int_32 may, currently, be larger than required to hold a
 470  * 32-bit value however this is not normally advisable.
 471  *
 472  * png_uint_16 and png_int_16 should always be two bytes in size - this is
 473  * verified at library build time.
 474  *
 475  * png_byte must always be one byte in size.
 476  *
 477  * The checks below use constants from limits.h, as defined by the ISOC90
 478  * standard.
 479  */
 480 #if CHAR_BIT == 8 && UCHAR_MAX == 255
 481    typedef unsigned char png_byte;
 482 #else
 483 #  error "libpng requires 8-bit bytes"
 484 #endif
 485
 486 #if INT_MIN == -32768 && INT_MAX == 32767
 487    typedef int png_int_16;
 488 #elif SHRT_MIN == -32768 && SHRT_MAX == 32767
 489    typedef short png_int_16;
 490 #else
 491 #  error "libpng requires a signed 16-bit type"
 492 #endif
 493
 494 #if UINT_MAX == 65535
 495    typedef unsigned int png_uint_16;
 496 #elif USHRT_MAX == 65535
 497    typedef unsigned short png_uint_16;
 498 #else
 499 #  error "libpng requires an unsigned 16-bit type"
 500 #endif
 501
 502 #if INT_MIN < -2147483646 && INT_MAX > 2147483646
 503    typedef int png_int_32;
 504 #elif LONG_MIN < -2147483646 && LONG_MAX > 2147483646
 505    typedef long int png_int_32;
 506 #else
 507 #  error "libpng requires a signed 32-bit (or more) type"
 508 #endif
 509
 510 #if UINT_MAX > 4294967294U
 511    typedef unsigned int png_uint_32;
 512 #elif ULONG_MAX > 4294967294U
 513    typedef unsigned long int png_uint_32;
 514 #else
 515 #  error "libpng requires an unsigned 32-bit (or more) type"
 516 #endif
 517
 518 /* Prior to 1.6.0, it was possible to disable the use of size_t and ptrdiff_t.
 519  * From 1.6.0 onwards, an ISO C90 compiler, as well as a standard-compliant
 520  * behavior of sizeof and ptrdiff_t are required.
 521  * The legacy typedefs are provided here for backwards compatibility.
 522  */
 523 typedef size_t png_size_t;
 524 typedef ptrdiff_t png_ptrdiff_t;
 525
 526 /* libpng needs to know the maximum value of 'size_t' and this controls the
 527  * definition of png_alloc_size_t, below.  This maximum value of size_t limits
 528  * but does not control the maximum allocations the library makes - there is
 529  * direct application control of this through png_set_user_limits().
 530  */
 531 #ifndef PNG_SMALL_SIZE_T
 532    /* Compiler specific tests for systems where size_t is known to be less than
 533     * 32 bits (some of these systems may no longer work because of the lack of
 534     * 'far' support; see above.)
 535     */
 536 #  if (defined(__TURBOC__) && !defined(__FLAT__)) ||\
 537    (defined(_MSC_VER) && defined(MAXSEG_64K))
 538 #     define PNG_SMALL_SIZE_T
 539 #  endif
 540 #endif
 541
 542 /* png_alloc_size_t is guaranteed to be no smaller than size_t, and no smaller
 543  * than png_uint_32.  Casts from size_t or png_uint_32 to png_alloc_size_t are
 544  * not necessary; in fact, it is recommended not to use them at all, so that
 545  * the compiler can complain when something turns out to be problematic.
 546  *
 547  * Casts in the other direction (from png_alloc_size_t to size_t or
 548  * png_uint_32) should be explicitly applied; however, we do not expect to
 549  * encounter practical situations that require such conversions.
 550  *
 551  * PNG_SMALL_SIZE_T must be defined if the maximum value of size_t is less than
 552  * 4294967295 - i.e. less than the maximum value of png_uint_32.
 553  */
 554 #ifdef PNG_SMALL_SIZE_T
 555    typedef png_uint_32 png_alloc_size_t;
 556 #else
 557    typedef size_t png_alloc_size_t;
 558 #endif
 559
 560 /* Prior to 1.6.0 libpng offered limited support for Microsoft C compiler
 561  * implementations of Intel CPU specific support of user-mode segmented address
 562  * spaces, where 16-bit pointers address more than 65536 bytes of memory using
 563  * separate 'segment' registers.  The implementation requires two different
 564  * types of pointer (only one of which includes the segment value.)
 565  *
 566  * If required this support is available in version 1.2 of libpng and may be
 567  * available in versions through 1.5, although the correctness of the code has
 568  * not been verified recently.
 569  */
 570
 571 /* Typedef for floating-point numbers that are converted to fixed-point with a
 572  * multiple of 100,000, e.g., gamma
 573  */
 574 typedef png_int_32 png_fixed_point;
 575
 576 /* Add typedefs for pointers */
 577 typedef void                  * png_voidp;
 578 typedef const void            * png_const_voidp;
 579 typedef png_byte              * png_bytep;
 580 typedef const png_byte        * png_const_bytep;
 581 typedef png_uint_32           * png_uint_32p;
 582 typedef const png_uint_32     * png_const_uint_32p;
 583 typedef png_int_32            * png_int_32p;
 584 typedef const png_int_32      * png_const_int_32p;
 585 typedef png_uint_16           * png_uint_16p;
 586 typedef const png_uint_16     * png_const_uint_16p;
 587 typedef png_int_16            * png_int_16p;
 588 typedef const png_int_16      * png_const_int_16p;
 589 typedef char                  * png_charp;
 590 typedef const char            * png_const_charp;
 591 typedef png_fixed_point       * png_fixed_point_p;
 592 typedef const png_fixed_point * png_const_fixed_point_p;
 593 typedef size_t                * png_size_tp;
 594 typedef const size_t          * png_const_size_tp;
 595
 596 #ifdef PNG_STDIO_SUPPORTED
 597 typedef FILE            * png_FILE_p;
 598 #endif
 599
 600 #ifdef PNG_FLOATING_POINT_SUPPORTED
 601 typedef double       * png_doublep;
 602 typedef const double * png_const_doublep;
 603 #endif
 604
 605 /* Pointers to pointers; i.e. arrays */
 606 typedef png_byte        * * png_bytepp;
 607 typedef png_uint_32     * * png_uint_32pp;
 608 typedef png_int_32      * * png_int_32pp;
 609 typedef png_uint_16     * * png_uint_16pp;
 610 typedef png_int_16      * * png_int_16pp;
 611 typedef const char      * * png_const_charpp;
 612 typedef char            * * png_charpp;
 613 typedef png_fixed_point * * png_fixed_point_pp;
 614 #ifdef PNG_FLOATING_POINT_SUPPORTED
 615 typedef double          * * png_doublepp;
 616 #endif
 617
 618 /* Pointers to pointers to pointers; i.e., pointer to array */
 619 typedef char            * * * png_charppp;
 620
 621 #endif /* PNG_BUILDING_SYMBOL_TABLE */
 622
 623 #endif /* PNGCONF_H */