pngconf.h

   1
   2 /* pngconf.h - machine configurable file for libpng
   3  *
   4  * libpng version 1.5.1 - February 3, 2011
   5  *
   6  * Copyright (c) 1998-2011 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 /* PNG_NO_LIMITS_H may be used to turn off the use of the standard C
  26  * definition file for  machine specific limits, this may impact the
  27  * correctness of the definitons below (see uses of INT_MAX).
  28  */
  29 #ifndef PNG_NO_LIMITS_H
  30 #  include <limits.h>
  31 #endif
  32
  33 /* For the memory copy APIs (i.e. the standard definitions of these),
  34  * because this file defines png_memcpy and so on the base APIs must
  35  * be defined here.
  36  */
  37 #ifdef BSD
  38 #  include <strings.h>
  39 #else
  40 #  include <string.h>
  41 #endif
  42
  43 /* For png_FILE_p - this provides the standard definition of a
  44  * FILE
  45  */
  46 #ifdef PNG_STDIO_SUPPORTED
  47 #  include <stdio.h>
  48 #endif
  49
  50 /* This controls optimization of the reading of 16 and 32 bit values
  51  * from PNG files.  It can be set on a per-app-file basis - it
  52  * just changes whether a macro is used to the function is called.
  53  * The library builder sets the default, if read functions are not
  54  * built into the library the macro implementation is forced on.
  55  */
  56 #ifndef PNG_READ_INT_FUNCTIONS_SUPPORTED
  57 #  define PNG_USE_READ_MACROS
  58 #endif
  59 #if !defined(PNG_NO_USE_READ_MACROS) && !defined(PNG_USE_READ_MACROS)
  60 #  if PNG_DEFAULT_READ_MACROS
  61 #    define PNG_USE_READ_MACROS
  62 #  endif
  63 #endif
  64
  65 /* COMPILER SPECIFIC OPTIONS.
  66  *
  67  * These options are provided so that a variety of difficult compilers
  68  * can be used.  Some are fixed at build time (e.g. PNG_API_RULE
  69  * below) but still have compiler specific implementations, others
  70  * may be changed on a per-file basis when compiling against libpng.
  71  */
  72
  73 /* The PNGARG macro protects us against machines that don't have function
  74  * prototypes (ie K&R style headers).  If your compiler does not handle
  75  * function prototypes, define this macro and use the included ansi2knr.
  76  * I've always been able to use _NO_PROTO as the indicator, but you may
  77  * need to drag the empty declaration out in front of here, or change the
  78  * ifdef to suit your own needs.
  79  */
  80 #ifndef PNGARG
  81
  82 #  ifdef OF /* zlib prototype munger */
  83 #    define PNGARG(arglist) OF(arglist)
  84 #  else
  85
  86 #    ifdef _NO_PROTO
  87 #      define PNGARG(arglist) ()
  88 #    else
  89 #      define PNGARG(arglist) arglist
  90 #    endif /* _NO_PROTO */
  91
  92 #  endif /* OF */
  93
  94 #endif /* PNGARG */
  95
  96 /* Function calling conventions.
  97  * =============================
  98  * Normally it is not necessary to specify to the compiler how to call
  99  * a function - it just does it - however on x86 systems derived from
 100  * Microsoft and Borland C compilers ('IBM PC', 'DOS', 'Windows' systems
 101  * and some others) there are multiple ways to call a function and the
 102  * default can be changed on the compiler command line.  For this reason
 103  * libpng specifies the calling convention of every exported function and
 104  * every function called via a user supplied function pointer.  This is
 105  * done in this file by defining the following macros:
 106  *
 107  * PNGAPI    Calling convention for exported functions.
 108  * PNGCBAPI  Calling convention for user provided (callback) functions.
 109  * PNGCAPI   Calling convention used by the ANSI-C library (required
 110  *           for longjmp callbacks and sometimes used internally to
 111  *           specify the calling convention for zlib).
 112  *
 113  * These macros should never be overridden.  If it is necessary to
 114  * change calling convention in a private build this can be done
 115  * by setting PNG_API_RULE (which defaults to 0) to one of the values
 116  * below to select the correct 'API' variants.
 117  *
 118  * PNG_API_RULE=0 Use PNGCAPI - the 'C' calling convention - throughout.
 119  *                This is correct in every known environment.
 120  * PNG_API_RULE=1 Use the operating system convention for PNGAPI and
 121  *                the 'C' calling convention (from PNGCAPI) for
 122  *                callbacks (PNGCBAPI).  This is no longer required
 123  *                in any known environment - if it has to be used
 124  *                please post an explanation of the problem to the
 125  *                libpng mailing list.
 126  *
 127  * These cases only differ if the operating system does not use the C
 128  * calling convention, at present this just means the above cases
 129  * (x86 DOS/Windows sytems) and, even then, this does not apply to
 130  * Cygwin running on those systems.
 131  *
 132  * Note that the value must be defined in pnglibconf.h so that what
 133  * the application uses to call the library matches the conventions
 134  * set when building the library.
 135  */
 136
 137 /* Symbol export
 138  * =============
 139  * When building a shared library it is almost always necessary to tell
 140  * the compiler which symbols to export.  The png.h macro 'PNG_EXPORT'
 141  * is used to mark the symbols.  On some systems these symbols can be
 142  * extracted at link time and need no special processing by the compiler,
 143  * on other systems the symbols are flagged by the compiler and just
 144  * the declaration requires a special tag applied (unfortunately) in a
 145  * compiler dependent way.  Some systems can do either.
 146  *
 147  * A small number of older systems also require a symbol from a DLL to
 148  * be flagged to the program that calls it.  This is a problem because
 149  * we do not know in the header file included by application code that
 150  * the symbol will come from a shared library, as opposed to a statically
 151  * linked one.  For this reason the application must tell us by setting
 152  * the magic flag PNG_USE_DLL to turn on the special processing before
 153  * it includes png.h.
 154  *
 155  * Four additional macros are used to make this happen:
 156  *
 157  * PNG_IMPEXP The magic (if any) to cause a symbol to be exported from
 158  *            the build or imported if PNG_USE_DLL is set - compiler
 159  *            and system specific.
 160  *
 161  * PNG_EXPORT_TYPE(type) A macro that pre or appends PNG_IMPEXP to
 162  *                       'type', compiler specific.
 163  *
 164  * PNG_DLL_EXPORT Set to the magic to use during a libpng build to
 165  *                make a symbol exported from the DLL.
 166  *
 167  * PNG_DLL_IMPORT Set to the magic to force the libpng symbols to come
 168  *                from a DLL - used to define PNG_IMPEXP when
 169  *                PNG_USE_DLL is set.
 170  */
 171
 172 /* System specific discovery.
 173  * ==========================
 174  * This code is used at build time to find PNG_IMPEXP, the API settings
 175  * and PNG_EXPORT_TYPE(), it may also set a macro to indicate the DLL
 176  * import processing is possible.  On Windows/x86 systems it also sets
 177  * compiler-specific macros to the values required to change the calling
 178  * conventions of the various functions.
 179  */
 180 #if ( defined(_Windows) || defined(_WINDOWS) || defined(WIN32) ||\
 181       defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__) ) &&\
 182     ( defined(_X86_) || defined(_X64_) || defined(_M_IX86) ||\
 183       defined(_M_X64) || defined(_M_IA64) )
 184   /* Windows system (DOS doesn't support DLLs) running on x86/x64.  Includes
 185    * builds under Cygwin or MinGW.  Also includes Watcom builds but these need
 186    * special treatment because they are not compatible with GCC or Visual C
 187    * because of different calling conventions.
 188    */
 189 #  if PNG_API_RULE == 2
 190     /* If this line results in an error, either because __watcall is not
 191      * understood or because of a redefine just below you cannot use *this*
 192      * build of the library with the compiler you are using.  *This* build was
 193      * build using Watcom and applications must also be built using Watcom!
 194      */
 195 #    define PNGCAPI __watcall
 196 #  endif
 197
 198 #  if defined(__GNUC__) || (defined (_MSC_VER) && (_MSC_VER >= 800))
 199 #    define PNGCAPI __cdecl
 200 #    if PNG_API_RULE == 1
 201 #      define PNGAPI __stdcall
 202 #    endif
 203 #  else
 204     /* An older compiler, or one not detected (erroneously) above,
 205      * if necessary override on the command line to get the correct
 206      * variants for the compiler.
 207      */
 208 #    ifndef PNGCAPI
 209 #      define PNGCAPI _cdecl
 210 #    endif
 211 #    if PNG_API_RULE == 1 && !defined(PNGAPI)
 212 #      define PNGAPI _stdcall
 213 #    endif
 214 #  endif /* compiler/api */
 215   /* NOTE: PNGCBAPI always defaults to PNGCAPI. */
 216
 217 #  if defined(PNGAPI) && !defined(PNG_USER_PRIVATEBUILD)
 218    ERROR: PNG_USER_PRIVATEBUILD must be defined if PNGAPI is changed
 219 #  endif
 220
 221 #  if (defined(_MSC_VER) && _MSC_VER < 800) ||\
 222       (defined(__BORLANDC__) && __BORLANDC__ < 0x500)
 223     /* older Borland and MSC
 224      * compilers used '__export' and required this to be after
 225      * the type.
 226      */
 227 #    ifndef PNG_EXPORT_TYPE
 228 #      define PNG_EXPORT_TYPE(type) type PNG_IMPEXP
 229 #    endif
 230 #    define PNG_DLL_EXPORT __export
 231 #  else /* newer compiler */
 232 #    define PNG_DLL_EXPORT __declspec(dllexport)
 233 #    ifndef PNG_DLL_IMPORT
 234 #      define PNG_DLL_IMPORT __declspec(dllimport)
 235 #    endif
 236 #  endif /* compiler */
 237
 238 #else /* !Windows/x86 */
 239 #  if (defined(__IBMC__) || defined(__IBMCPP__)) && defined(__OS2__)
 240 #    define PNGAPI _System
 241 #  else /* !Windows/x86 && !OS/2 */
 242     /* Use the defaults, or define PNG*API on the command line (but
 243      * this will have to be done for every compile!)
 244      */
 245 #  endif /* other system, !OS/2 */
 246 #endif /* !Windows/x86 */
 247
 248 /* Now do all the defaulting . */
 249 #ifndef PNGCAPI
 250 #  define PNGCAPI
 251 #endif
 252 #ifndef PNGCBAPI
 253 #  define PNGCBAPI PNGCAPI
 254 #endif
 255 #ifndef PNGAPI
 256 #  define PNGAPI PNGCAPI
 257 #endif
 258
 259 /* The default for PNG_IMPEXP depends on whether the library is
 260  * being built or used.
 261  */
 262 #ifndef PNG_IMPEXP
 263 #  ifdef PNGLIB_BUILD
 264     /* Building the library */
 265 #    if (defined(DLL_EXPORT)/*from libtool*/ ||\
 266         defined(_WINDLL) || defined(_DLL) || defined(__DLL__) ||\
 267         defined(_USRDLL) ||\
 268         defined(PNG_BUILD_DLL)) && defined(PNG_DLL_EXPORT)
 269       /* Building a DLL. */
 270 #      define PNG_IMPEXP PNG_DLL_EXPORT
 271 #    endif /* DLL */
 272 #  else
 273     /* Using the library */
 274 #    if defined(PNG_USE_DLL) && defined(PNG_DLL_IMPORT)
 275       /* This forces use of a DLL, disallowing static linking */
 276 #      define PNG_IMPEXP PNG_DLL_IMPORT
 277 #    endif
 278 #  endif
 279
 280 #  ifndef PNG_IMPEXP
 281 #    define PNG_IMPEXP
 282 #  endif
 283 #endif
 284
 285 /* THe following complexity is concerned with getting the 'attributes' of the
 286  * declared function in the correct place.  This potentially requires a separate
 287  * PNG_EXPORT function for every compiler.
 288  */
 289 #ifndef PNG_FUNCTION
 290 #  ifdef __GNUC__
 291 #     define PNG_FUNCTION(type, name, args, attributes)\
 292          attributes type name args
 293 #  else /* !GNUC */
 294 #     ifdef _MSC_VER
 295 #        define PNG_FUNCTION(type, name, args, attributes)\
 296          attributes type name args
 297 #     else /* !MSC */
 298 #        define PNG_FUNCTION(type, name, args, attributes)\
 299             type name args
 300 #     endif
 301 #  endif
 302 #endif
 303
 304 #ifndef PNG_EXPORT_TYPE
 305 #  define PNG_EXPORT_TYPE(type) PNG_IMPEXP type
 306 #endif
 307
 308    /* The ordinal value is only relevant when preprocessing png.h for symbol
 309     * table entries, so we discard it here.  See the .dfn files in the
 310     * scripts directory.
 311     */
 312 #ifndef PNG_EXPORTA
 313 #  define PNG_EXPORTA(ordinal, type, name, args, attributes)\
 314       extern PNG_FUNCTION(PNG_EXPORT_TYPE(type),(PNGAPI name),PNGARG(args),\
 315          attributes)
 316 #endif
 317
 318 #define PNG_EXPORT(ordinal, type, name, args)\
 319    PNG_EXPORTA(ordinal, type, name, args, )
 320
 321 /* Use PNG_REMOVED to comment out a removed interface. */
 322 #ifndef PNG_REMOVED
 323 #  define PNG_REMOVED(ordinal, type, name, args, attributes)
 324 #endif
 325
 326 #ifndef PNG_CALLBACK
 327 #  define PNG_CALLBACK(type, name, args, attributes)\
 328    type (PNGCBAPI name) PNGARG(args) attributes
 329 #endif
 330
 331 /* Support for compiler specific function attributes.  These are used
 332  * so that where compiler support is available incorrect use of API
 333  * functions in png.h will generate compiler warnings.
 334  *
 335  * Added at libpng-1.2.41.
 336  */
 337
 338 #ifndef PNG_NO_PEDANTIC_WARNINGS
 339 #  ifndef PNG_PEDANTIC_WARNINGS_SUPPORTED
 340 #    define PNG_PEDANTIC_WARNINGS_SUPPORTED
 341 #  endif
 342 #endif
 343
 344 #ifdef PNG_PEDANTIC_WARNINGS_SUPPORTED
 345   /* Support for compiler specific function attributes.  These are used
 346    * so that where compiler support is available incorrect use of API
 347    * functions in png.h will generate compiler warnings.  Added at libpng
 348    * version 1.2.41.
 349    */
 350 #  ifdef __GNUC__
 351 #    ifndef PNG_USE_RESULT
 352 #      define PNG_USE_RESULT __attribute__((__warn_unused_result__))
 353 #    endif
 354 #    ifndef PNG_NORETURN
 355 #      define PNG_NORETURN   __attribute__((__noreturn__))
 356 #    endif
 357 #    ifndef PNG_PTR_NORETURN
 358 #      define PNG_PTR_NORETURN   __attribute__((__noreturn__))
 359 #    endif
 360 #    ifndef PNG_ALLOCATED
 361 #      define PNG_ALLOCATED  __attribute__((__malloc__))
 362 #    endif
 363
 364     /* This specifically protects structure members that should only be
 365      * accessed from within the library, therefore should be empty during
 366      * a library build.
 367      */
 368 #    ifndef PNGLIB_BUILD
 369 #      ifndef PNG_DEPRECATED
 370 #        define PNG_DEPRECATED __attribute__((__deprecated__))
 371 #      endif
 372 #      ifndef PNG_DEPSTRUCT
 373 #        define PNG_DEPSTRUCT  __attribute__((__deprecated__))
 374 #      endif
 375 #      ifndef PNG_PRIVATE
 376 #        if 0 /* Doesn't work so we use deprecated instead*/
 377 #          define PNG_PRIVATE \
 378             __attribute__((warning("This function is not exported by libpng.")))
 379 #        else
 380 #          define PNG_PRIVATE \
 381             __attribute__((__deprecated__))
 382 #        endif
 383 #      endif /* PNG_PRIVATE */
 384 #    endif /* PNGLIB_BUILD */
 385 #  endif /* __GNUC__ */
 386 #  ifdef _MSC_VER /* may need to check value */
 387 #    ifndef PNG_USE_RESULT
 388 #      define PNG_USE_RESULT /*not supported*/
 389 #    endif
 390 #    ifndef PNG_NORETURN
 391 #      define PNG_NORETURN   __declspec(noreturn)
 392 #    endif
 393 #    ifndef PNG_PTR_NORETURN
 394 #      define PNG_PTR_NORETURN /*not supported*/
 395 #    endif
 396 #    ifndef PNG_ALLOCATED
 397 #      define PNG_ALLOCATED __declspec(restrict)
 398 #    endif
 399
 400     /* This specifically protects structure members that should only be
 401      * accessed from within the library, therefore should be empty during
 402      * a library build.
 403      */
 404 #    ifndef PNGLIB_BUILD
 405 #      ifndef PNG_DEPRECATED
 406 #        define PNG_DEPRECATED __declspec(deprecated)
 407 #      endif
 408 #      ifndef PNG_DEPSTRUCT
 409 #        define PNG_DEPSTRUCT  __declspec(deprecated)
 410 #      endif
 411 #      ifndef PNG_PRIVATE
 412 #        define PNG_PRIVATE __declspec(deprecated)
 413 #      endif /* PNG_PRIVATE */
 414 #    endif /* PNGLIB_BUILD */
 415 #  endif /* __GNUC__ */
 416 #endif /* PNG_PEDANTIC_WARNINGS */
 417
 418 #ifndef PNG_DEPRECATED
 419 #  define PNG_DEPRECATED  /* Use of this function is deprecated */
 420 #endif
 421 #ifndef PNG_USE_RESULT
 422 #  define PNG_USE_RESULT  /* The result of this function must be checked */
 423 #endif
 424 #ifndef PNG_NORETURN
 425 #  define PNG_NORETURN    /* This function does not return */
 426 #endif
 427 #ifndef PNG_ALLOCATED
 428 #  define PNG_ALLOCATED   /* The result of the function is new memory */
 429 #endif
 430 #ifndef PNG_DEPSTRUCT
 431 #  define PNG_DEPSTRUCT   /* Access to this struct member is deprecated */
 432 #endif
 433 #ifndef PNG_PRIVATE
 434 #  define PNG_PRIVATE     /* This is a private libpng function */
 435 #endif
 436 #ifndef PNG_FP_EXPORT     /* A floating point API. */
 437 #  ifdef PNG_FLOATING_POINT_SUPPORTED
 438 #     define PNG_FP_EXPORT(ordinal, type, name, args)\
 439          PNG_EXPORT(ordinal, type, name, args)
 440 #  else                   /* No floating point APIs */
 441 #     define PNG_FP_EXPORT(ordinal, type, name, args)
 442 #  endif
 443 #endif
 444 #ifndef PNG_FIXED_EXPORT  /* A fixed point API. */
 445 #  ifdef PNG_FIXED_POINT_SUPPORTED
 446 #     define PNG_FIXED_EXPORT(ordinal, type, name, args)\
 447          PNG_EXPORT(ordinal, type, name, args)
 448 #  else                   /* No fixed point APIs */
 449 #     define PNG_FIXED_EXPORT(ordinal, type, name, args)
 450 #  endif
 451 #endif
 452
 453 /* The following uses const char * instead of char * for error
 454  * and warning message functions, so some compilers won't complain.
 455  * If you do not want to use const, define PNG_NO_CONST here.
 456  *
 457  * This should not change how the APIs are called, so it can be done
 458  * on a per-file basis in the application.
 459  */
 460 #ifndef PNG_CONST
 461 #  ifndef PNG_NO_CONST
 462 #    define PNG_CONST const
 463 #  else
 464 #    define PNG_CONST
 465 #  endif
 466 #endif
 467
 468 /* Some typedefs to get us started.  These should be safe on most of the
 469  * common platforms.  The typedefs should be at least as large as the
 470  * numbers suggest (a png_uint_32 must be at least 32 bits long), but they
 471  * don't have to be exactly that size.  Some compilers dislike passing
 472  * unsigned shorts as function parameters, so you may be better off using
 473  * unsigned int for png_uint_16.
 474  */
 475
 476 #if defined(INT_MAX) && (INT_MAX > 0x7ffffffeL)
 477 typedef unsigned int png_uint_32;
 478 typedef int png_int_32;
 479 #else
 480 typedef unsigned long png_uint_32;
 481 typedef long png_int_32;
 482 #endif
 483 typedef unsigned short png_uint_16;
 484 typedef short png_int_16;
 485 typedef unsigned char png_byte;
 486
 487 #ifdef PNG_NO_SIZE_T
 488 typedef unsigned int png_size_t;
 489 #else
 490 typedef size_t png_size_t;
 491 #endif
 492 #define png_sizeof(x) (sizeof (x))
 493
 494 /* The following is needed for medium model support.  It cannot be in the
 495  * pngpriv.h header.  Needs modification for other compilers besides
 496  * MSC.  Model independent support declares all arrays and pointers to be
 497  * large using the far keyword.  The zlib version used must also support
 498  * model independent data.  As of version zlib 1.0.4, the necessary changes
 499  * have been made in zlib.  The USE_FAR_KEYWORD define triggers other
 500  * changes that are needed. (Tim Wegner)
 501  */
 502
 503 /* Separate compiler dependencies (problem here is that zlib.h always
 504  * defines FAR. (SJT)
 505  */
 506 #ifdef __BORLANDC__
 507 #  if defined(__LARGE__) || defined(__HUGE__) || defined(__COMPACT__)
 508 #    define LDATA 1
 509 #  else
 510 #    define LDATA 0
 511 #  endif
 512   /* GRR:  why is Cygwin in here?  Cygwin is not Borland C... */
 513 #  if !defined(__WIN32__) && !defined(__FLAT__) && !defined(__CYGWIN__)
 514 #    define PNG_MAX_MALLOC_64K /* only used in build */
 515 #    if (LDATA != 1)
 516 #      ifndef FAR
 517 #        define FAR __far
 518 #      endif
 519 #      define USE_FAR_KEYWORD
 520 #    endif   /* LDATA != 1 */
 521          /* Possibly useful for moving data out of default segment.
 522           * Uncomment it if you want. Could also define FARDATA as
 523           * const if your compiler supports it. (SJT)
 524 #        define FARDATA FAR
 525           */
 526 #  endif  /* __WIN32__, __FLAT__, __CYGWIN__ */
 527 #endif   /* __BORLANDC__ */
 528
 529
 530 /* Suggest testing for specific compiler first before testing for
 531  * FAR.  The Watcom compiler defines both __MEDIUM__ and M_I86MM,
 532  * making reliance oncertain keywords suspect. (SJT)
 533  */
 534
 535 /* MSC Medium model */
 536 #ifdef FAR
 537 #  ifdef M_I86MM
 538 #    define USE_FAR_KEYWORD
 539 #    define FARDATA FAR
 540 #    include <dos.h>
 541 #  endif
 542 #endif
 543
 544 /* SJT: default case */
 545 #ifndef FAR
 546 #  define FAR
 547 #endif
 548
 549 /* At this point FAR is always defined */
 550 #ifndef FARDATA
 551 #  define FARDATA
 552 #endif
 553
 554 /* Typedef for floating-point numbers that are converted
 555  * to fixed-point with a multiple of 100,000, e.g., gamma
 556  */
 557 typedef png_int_32 png_fixed_point;
 558
 559 /* Add typedefs for pointers */
 560 typedef void                      FAR * png_voidp;
 561 typedef PNG_CONST void            FAR * png_const_voidp;
 562 typedef png_byte                  FAR * png_bytep;
 563 typedef PNG_CONST png_byte        FAR * png_const_bytep;
 564 typedef png_uint_32               FAR * png_uint_32p;
 565 typedef PNG_CONST png_uint_32     FAR * png_const_uint_32p;
 566 typedef png_int_32                FAR * png_int_32p;
 567 typedef PNG_CONST png_int_32      FAR * png_const_int_32p;
 568 typedef png_uint_16               FAR * png_uint_16p;
 569 typedef PNG_CONST png_uint_16     FAR * png_const_uint_16p;
 570 typedef png_int_16                FAR * png_int_16p;
 571 typedef PNG_CONST png_int_16      FAR * png_const_int_16p;
 572 typedef char                      FAR * png_charp;
 573 typedef PNG_CONST char            FAR * png_const_charp;
 574 typedef png_fixed_point           FAR * png_fixed_point_p;
 575 typedef PNG_CONST png_fixed_point FAR * png_const_fixed_point_p;
 576 typedef png_size_t                FAR * png_size_tp;
 577 typedef PNG_CONST png_size_t      FAR * png_const_size_tp;
 578
 579 #ifdef PNG_STDIO_SUPPORTED
 580 typedef FILE            * png_FILE_p;
 581 #endif
 582
 583 #ifdef PNG_FLOATING_POINT_SUPPORTED
 584 typedef double           FAR * png_doublep;
 585 typedef PNG_CONST double FAR * png_const_doublep;
 586 #endif
 587
 588 /* Pointers to pointers; i.e. arrays */
 589 typedef png_byte        FAR * FAR * png_bytepp;
 590 typedef png_uint_32     FAR * FAR * png_uint_32pp;
 591 typedef png_int_32      FAR * FAR * png_int_32pp;
 592 typedef png_uint_16     FAR * FAR * png_uint_16pp;
 593 typedef png_int_16      FAR * FAR * png_int_16pp;
 594 typedef PNG_CONST char  FAR * FAR * png_const_charpp;
 595 typedef char            FAR * FAR * png_charpp;
 596 typedef png_fixed_point FAR * FAR * png_fixed_point_pp;
 597 #ifdef PNG_FLOATING_POINT_SUPPORTED
 598 typedef double          FAR * FAR * png_doublepp;
 599 #endif
 600
 601 /* Pointers to pointers to pointers; i.e., pointer to array */
 602 typedef char            FAR * FAR * FAR * png_charppp;
 603
 604 /* png_alloc_size_t is guaranteed to be no smaller than png_size_t,
 605  * and no smaller than png_uint_32.  Casts from png_size_t or png_uint_32
 606  * to png_alloc_size_t are not necessary; in fact, it is recommended
 607  * not to use them at all so that the compiler can complain when something
 608  * turns out to be problematic.
 609  * Casts in the other direction (from png_alloc_size_t to png_size_t or
 610  * png_uint_32) should be explicitly applied; however, we do not expect
 611  * to encounter practical situations that require such conversions.
 612  */
 613 #if defined(__TURBOC__) && !defined(__FLAT__)
 614    typedef unsigned long png_alloc_size_t;
 615 #else
 616 #  if defined(_MSC_VER) && defined(MAXSEG_64K)
 617      typedef unsigned long    png_alloc_size_t;
 618 #  else
 619      /* This is an attempt to detect an old Windows system where (int) is
 620       * actually 16 bits, in that case png_malloc must have an argument with a
 621       * bigger size to accomodate the requirements of the library.
 622       */
 623 #    if (defined(_Windows) || defined(_WINDOWS) || defined(_WINDOWS_)) && \
 624         (!defined(INT_MAX) || INT_MAX <= 0x7ffffffeL)
 625        typedef DWORD         png_alloc_size_t;
 626 #    else
 627        typedef png_size_t    png_alloc_size_t;
 628 #    endif
 629 #  endif
 630 #endif
 631
 632 #endif /* PNGCONF_H */