src/png/pngconf.h

   1
   2 /* pngconf.h - machine configurable file for libpng
   3  *
   4  * libpng 1.0.3 - January 14, 1999
   5  * For conditions of distribution and use, see copyright notice in png.h
   6  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
   7  * Copyright (c) 1996, 1997 Andreas Dilger
   8  * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
   9  */
  10
  11 /* Any machine specific code is near the front of this file, so if you
  12  * are configuring libpng for a machine, you may want to read the section
  13  * starting here down to where it starts to typedef png_color, png_text,
  14  * and png_info.
  15  */
  16
  17 #ifndef PNGCONF_H
  18 #define PNGCONF_H
  19
  20
  21 /* This is the size of the compression buffer, and thus the size of
  22  * an IDAT chunk.  Make this whatever size you feel is best for your
  23  * machine.  One of these will be allocated per png_struct.  When this
  24  * is full, it writes the data to the disk, and does some other
  25  * calculations.  Making this an extremely small size will slow
  26  * the library down, but you may want to experiment to determine
  27  * where it becomes significant, if you are concerned with memory
  28  * usage.  Note that zlib allocates at least 32Kb also.  For readers,
  29  * this describes the size of the buffer available to read the data in.
  30  * Unless this gets smaller than the size of a row (compressed),
  31  * it should not make much difference how big this is.
  32  */
  33
  34 #ifndef PNG_ZBUF_SIZE
  35 #define PNG_ZBUF_SIZE 8192
  36 #endif
  37
  38 /* If you are running on a machine where you cannot allocate more
  39  * than 64K of memory at once, uncomment this.  While libpng will not
  40  * normally need that much memory in a chunk (unless you load up a very
  41  * large file), zlib needs to know how big of a chunk it can use, and
  42  * libpng thus makes sure to check any memory allocation to verify it
  43  * will fit into memory.
  44 #define PNG_MAX_MALLOC_64K
  45  */
  46 #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
  47 #define PNG_MAX_MALLOC_64K
  48 #endif
  49
  50 /* This protects us against compilers that run on a windowing system
  51  * and thus don't have or would rather us not use the stdio types:
  52  * stdin, stdout, and stderr.  The only one currently used is stderr
  53  * in png_error() and png_warning().  #defining PNG_NO_CONSOLE_IO will
  54  * prevent these from being compiled and used. #defining PNG_NO_STDIO
  55  * will also prevent these, plus will prevent the entire set of stdio
  56  * macros and functions (FILE *, printf, etc.) from being compiled and used,
  57  * unless PNG_DEBUG has been #defined.
  58  *
  59  * #define PNG_NO_CONSOLE_IO
  60  * #define PNG_NO_STDIO
  61  */
  62
  63 #ifdef PNG_DEBUG
  64 #  if (PNG_DEBUG > 0)
  65 #    include <stdio.h>
  66 #  endif
  67 #else
  68 #  ifdef PNG_NO_STDIO
  69 #    ifndef PNG_NO_CONSOLE_IO
  70 #      define PNG_NO_CONSOLE_IO
  71 #    endif
  72 #  else
  73 #    include <stdio.h>
  74 #  endif
  75 #endif
  76
  77 /* This macro protects us against machines that don't have function
  78  * prototypes (ie K&R style headers).  If your compiler does not handle
  79  * function prototypes, define this macro and use the included ansi2knr.
  80  * I've always been able to use _NO_PROTO as the indicator, but you may
  81  * need to drag the empty declaration out in front of here, or change the
  82  * ifdef to suit your own needs.
  83  */
  84 #ifndef PNGARG
  85
  86 #ifdef OF /* zlib prototype munger */
  87 #define PNGARG(arglist) OF(arglist)
  88 #else
  89
  90 #ifdef _NO_PROTO
  91 #define PNGARG(arglist) ()
  92 #else
  93 #define PNGARG(arglist) arglist
  94 #endif /* _NO_PROTO */
  95
  96 #endif /* OF */
  97
  98 #endif /* PNGARG */
  99
 100 /* Try to determine if we are compiling on a Mac.  Note that testing for
 101  * just __MWERKS__ is not good enough, because the Codewarrior is now used
 102  * on non-Mac platforms.
 103  */
 104 #ifndef MACOS
 105 #if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
 106     defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
 107 #define MACOS
 108 #endif
 109 #endif
 110
 111 /* enough people need this for various reasons to include it here */
 112 #if !defined(MACOS) && !defined(RISCOS)
 113 #include <sys/types.h>
 114 #endif
 115
 116 /* This is an attempt to force a single setjmp behaviour on Linux.  If
 117  * the X config stuff didn't define _BSD_SOURCE we wouldn't need this.
 118  */
 119 #ifdef __linux__
 120 #ifdef _BSD_SOURCE
 121 #define _PNG_SAVE_BSD_SOURCE
 122 #undef _BSD_SOURCE
 123 #endif
 124 #ifdef _SETJMP_H
 125 __png.h__ already includes setjmp.h
 126 __dont__ include it again
 127 #endif
 128 #endif /* __linux__ */
 129
 130 /* include setjmp.h for error handling */
 131 #include <setjmp.h>
 132
 133 #ifdef __linux__
 134 #ifdef _PNG_SAVE_BSD_SOURCE
 135 #define _BSD_SOURCE
 136 #undef _PNG_SAVE_BSD_SOURCE
 137 #endif
 138 #endif /* __linux__ */
 139
 140 #ifdef BSD
 141 #include <strings.h>
 142 #else
 143 #include <string.h>
 144 #endif
 145
 146 /* Other defines for things like memory and the like can go here.  */
 147 #ifdef PNG_INTERNAL
 148 #include <stdlib.h>
 149
 150 /* The functions exported by PNG_EXTERN are PNG_INTERNAL functions, which
 151  * aren't usually used outside the library (as far as I know), so it is
 152  * debatable if they should be exported at all.  In the future, when it is
 153  * possible to have run-time registry of chunk-handling functions, some of
 154  * these will be made available again.
 155 #define PNG_EXTERN extern
 156  */
 157 #define PNG_EXTERN
 158
 159 /* Other defines specific to compilers can go here.  Try to keep
 160  * them inside an appropriate ifdef/endif pair for portability.
 161  */
 162
 163 #if defined(MACOS)
 164 /* We need to check that <math.h> hasn't already been included earlier
 165  * as it seems it doesn't agree with <fp.h>, yet we should really use
 166  * <fp.h> if possible.
 167  */
 168 #if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
 169 #include <fp.h>
 170 #endif
 171 #else
 172 #include <math.h>
 173 #endif
 174
 175 /* Codewarrior on NT has linking problems without this. */
 176 #if defined(__MWERKS__) && defined(WIN32)
 177 #define PNG_ALWAYS_EXTERN
 178 #endif
 179
 180 /* For some reason, Borland C++ defines memcmp, etc. in mem.h, not
 181  * stdlib.h like it should (I think).  Or perhaps this is a C++
 182  * "feature"?
 183  */
 184 #ifdef __TURBOC__
 185 #include <mem.h>
 186 #include "alloc.h"
 187 #endif
 188
 189 #ifdef _MSC_VER
 190 #include <malloc.h>
 191 #endif
 192
 193 /* This controls how fine the dithering gets.  As this allocates
 194  * a largish chunk of memory (32K), those who are not as concerned
 195  * with dithering quality can decrease some or all of these.
 196  */
 197 #ifndef PNG_DITHER_RED_BITS
 198 #define PNG_DITHER_RED_BITS 5
 199 #endif
 200 #ifndef PNG_DITHER_GREEN_BITS
 201 #define PNG_DITHER_GREEN_BITS 5
 202 #endif
 203 #ifndef PNG_DITHER_BLUE_BITS
 204 #define PNG_DITHER_BLUE_BITS 5
 205 #endif
 206
 207 /* This controls how fine the gamma correction becomes when you
 208  * are only interested in 8 bits anyway.  Increasing this value
 209  * results in more memory being used, and more pow() functions
 210  * being called to fill in the gamma tables.  Don't set this value
 211  * less then 8, and even that may not work (I haven't tested it).
 212  */
 213
 214 #ifndef PNG_MAX_GAMMA_8
 215 #define PNG_MAX_GAMMA_8 11
 216 #endif
 217
 218 /* This controls how much a difference in gamma we can tolerate before
 219  * we actually start doing gamma conversion.
 220  */
 221 #ifndef PNG_GAMMA_THRESHOLD
 222 #define PNG_GAMMA_THRESHOLD 0.05
 223 #endif
 224
 225 #endif /* PNG_INTERNAL */
 226
 227 /* The following uses const char * instead of char * for error
 228  * and warning message functions, so some compilers won't complain.
 229  * If you do not want to use const, define PNG_NO_CONST here.
 230  */
 231
 232 #ifndef PNG_NO_CONST
 233 #  define PNG_CONST const
 234 #else
 235 #  define PNG_CONST
 236 #endif
 237
 238 /* The following defines give you the ability to remove code from the
 239  * library that you will not be using.  I wish I could figure out how to
 240  * automate this, but I can't do that without making it seriously hard
 241  * on the users.  So if you are not using an ability, change the #define
 242  * to and #undef, and that part of the library will not be compiled.  If
 243  * your linker can't find a function, you may want to make sure the
 244  * ability is defined here.  Some of these depend upon some others being
 245  * defined.  I haven't figured out all the interactions here, so you may
 246  * have to experiment awhile to get everything to compile.  If you are
 247  * creating or using a shared library, you probably shouldn't touch this,
 248  * as it will affect the size of the structures, and this will cause bad
 249  * things to happen if the library and/or application ever change.
 250  */
 251
 252 /* Any transformations you will not be using can be undef'ed here */
 253
 254 /* GR-P, 0.96a: Set "*TRANSFORMS_SUPPORTED as default but allow user
 255    to turn it off with "*TRANSFORMS_NOT_SUPPORTED" or *PNG_NO_*_TRANSFORMS
 256    on the compile line, then pick and choose which ones to define without
 257    having to edit this file. It is safe to use the *TRANSFORMS_NOT_SUPPORTED
 258    if you only want to have a png-compliant reader/writer but don't need
 259    any of the extra transformations.  This saves about 80 kbytes in a
 260    typical installation of the library. (PNG_NO_* form added in version
 261    1.0.1c, for consistency)
 262  */
 263
 264
 265 #if !defined(PNG_READ_TRANSFORMS_NOT_SUPPORTED) && \
 266     !defined(PNG_NO_READ_TRANSFORMS)
 267 #define PNG_READ_TRANSFORMS_SUPPORTED
 268 #endif
 269 #if !defined(PNG_WRITE_TRANSFORMS_NOT_SUPPORTED) && \
 270     !defined(PNG_NO_WRITE_TRANSFORMS)
 271 #define PNG_WRITE_TRANSFORMS_SUPPORTED
 272 #endif
 273
 274 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
 275 #ifndef PNG_NO_READ_EXPAND
 276 #define PNG_READ_EXPAND_SUPPORTED
 277 #endif
 278 #ifndef PNG_NO_READ_SHIFT
 279 #define PNG_READ_SHIFT_SUPPORTED
 280 #endif
 281 #ifndef PNG_NO_READ_PACK
 282 #define PNG_READ_PACK_SUPPORTED
 283 #endif
 284 #ifndef PNG_NO_READ_BGR
 285 #define PNG_READ_BGR_SUPPORTED
 286 #endif
 287 #ifndef PNG_NO_READ_SWAP
 288 #define PNG_READ_SWAP_SUPPORTED
 289 #endif
 290 #ifndef PNG_NO_READ_PACKSWAP
 291 #define PNG_READ_PACKSWAP_SUPPORTED
 292 #endif
 293 #ifndef PNG_NO_READ_INVERT
 294 #define PNG_READ_INVERT_SUPPORTED
 295 #endif
 296 #ifndef PNG_NO_READ_DITHER
 297 #define PNG_READ_DITHER_SUPPORTED
 298 #endif
 299 #ifndef PNG_NO_READ_BACKGROUND
 300 #define PNG_READ_BACKGROUND_SUPPORTED
 301 #endif
 302 #ifndef PNG_NO_READ_16_TO_8
 303 #define PNG_READ_16_TO_8_SUPPORTED
 304 #endif
 305 #ifndef PNG_NO_READ_FILLER
 306 #define PNG_READ_FILLER_SUPPORTED
 307 #endif
 308 #ifndef PNG_NO_READ_GAMMA
 309 #define PNG_READ_GAMMA_SUPPORTED
 310 #endif
 311 #ifndef PNG_NO_READ_GRAY_TO_RGB
 312 #define PNG_READ_GRAY_TO_RGB_SUPPORTED
 313 #endif
 314 #ifndef PNG_NO_READ_SWAP_ALPHA
 315 #define PNG_READ_SWAP_ALPHA_SUPPORTED
 316 #endif
 317 #ifndef PNG_NO_READ_INVERT_ALPHA
 318 #define PNG_READ_INVERT_ALPHA_SUPPORTED
 319 #endif
 320 #ifndef PNG_NO_READ_STRIP_ALPHA
 321 #define PNG_READ_STRIP_ALPHA_SUPPORTED
 322 #endif
 323 #ifndef PNG_NO_READ_USER_TRANSFORM
 324 #define PNG_READ_USER_TRANSFORM_SUPPORTED
 325 #endif
 326 #ifndef PNG_NO_READ_RGB_TO_GRAY
 327 #define PNG_READ_RGB_TO_GRAY_SUPPORTED
 328 #endif
 329 #endif /* PNG_READ_TRANSFORMS_SUPPORTED */
 330
 331 #if !defined(PNG_NO_PROGRESSIVE_READ) && \
 332  !defined(PNG_PROGRESSIVE_READ_NOT_SUPPORTED) /* if you don't do progressive   */
 333 #define PNG_PROGRESSIVE_READ_SUPPORTED       /* reading.  This is not talking */
 334 #endif                               /* about interlacing capability!  You'll */
 335               /* still have interlacing unless you change the following line: */
 336 #define PNG_READ_INTERLACING_SUPPORTED /* required for PNG-compliant decoders */
 337
 338 #ifndef PNG_NO_READ_COMPOSITED_NODIV
 339 #define PNG_READ_COMPOSITE_NODIV_SUPPORTED    /* well tested on Intel and SGI */
 340 #endif
 341
 342 #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
 343 #ifndef PNG_NO_WRITE_SHIFT
 344 #define PNG_WRITE_SHIFT_SUPPORTED
 345 #endif
 346 #ifndef PNG_NO_WRITE_PACK
 347 #define PNG_WRITE_PACK_SUPPORTED
 348 #endif
 349 #ifndef PNG_NO_WRITE_BGR
 350 #define PNG_WRITE_BGR_SUPPORTED
 351 #endif
 352 #ifndef PNG_NO_WRITE_SWAP
 353 #define PNG_WRITE_SWAP_SUPPORTED
 354 #endif
 355 #ifndef PNG_NO_WRITE_PACKSWAP
 356 #define PNG_WRITE_PACKSWAP_SUPPORTED
 357 #endif
 358 #ifndef PNG_NO_WRITE_INVERT
 359 #define PNG_WRITE_INVERT_SUPPORTED
 360 #endif
 361 #ifndef PNG_NO_WRITE_FILLER
 362 #define PNG_WRITE_FILLER_SUPPORTED  /* This is the same as WRITE_STRIP_ALPHA */
 363 #endif
 364 #ifndef PNG_NO_WRITE_SWAP_ALPHA
 365 #define PNG_WRITE_SWAP_ALPHA_SUPPORTED
 366 #endif
 367 #ifndef PNG_NO_WRITE_INVERT_ALPHA
 368 #define PNG_WRITE_INVERT_ALPHA_SUPPORTED
 369 #endif
 370 #ifndef PNG_NO_WRITE_USER_TRANSFORM
 371 #define PNG_WRITE_USER_TRANSFORM_SUPPORTED
 372 #endif
 373 #endif /* PNG_WRITE_TRANSFORMS_SUPPORTED */
 374
 375 #define PNG_WRITE_INTERLACING_SUPPORTED  /* not required for PNG-compliant
 376                                             encoders, but can cause trouble
 377                                             if left undefined */
 378
 379 #ifndef PNG_NO_WRITE_WEIGHTED_FILTER
 380 #define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
 381 #endif
 382
 383 #ifndef PNG_NO_WRITE_FLUSH
 384 #define PNG_WRITE_FLUSH_SUPPORTED
 385 #endif
 386
 387 #ifndef PNG_NO_STDIO
 388 #define PNG_TIME_RFC1123_SUPPORTED
 389 #endif
 390
 391 /* This adds extra functions in pngget.c for accessing data from the
 392  * info pointer (added in version 0.99)
 393  * png_get_image_width()
 394  * png_get_image_height()
 395  * png_get_bit_depth()
 396  * png_get_color_type()
 397  * png_get_compression_type()
 398  * png_get_filter_type()
 399  * png_get_interlace_type()
 400  * png_get_pixel_aspect_ratio()
 401  * png_get_pixels_per_meter()
 402  * png_get_x_offset_pixels()
 403  * png_get_y_offset_pixels()
 404  * png_get_x_offset_microns()
 405  * png_get_y_offset_microns()
 406  */
 407 #ifndef PNG_NO_EASY_ACCESS
 408 #define PNG_EASY_ACCESS_SUPPORTED
 409 #endif
 410
 411 /* These are currently experimental features, define them if you want */
 412
 413 /* very little testing */
 414 /*
 415 #define PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
 416 #define PNG_USER_MEM_SUPPORTED
 417 */
 418
 419 /* This is only for PowerPC big-endian and 680x0 systems */
 420 /* some testing */
 421 /*
 422 #define PNG_READ_BIG_ENDIAN_SUPPORTED
 423 */
 424
 425 /* These functions are turned off by default, as they will be phased out. */
 426 /*
 427 #define  PNG_USELESS_TESTS_SUPPORTED
 428 #define  PNG_CORRECT_PALETTE_SUPPORTED
 429 */
 430
 431 /* Any chunks you are not interested in, you can undef here.  The
 432  * ones that allocate memory may be expecially important (hIST,
 433  * tEXt, zTXt, tRNS, pCAL).  Others will just save time and make png_info
 434  * a bit smaller.
 435  */
 436
 437 #if !defined(PNG_READ_ANCILLARY_CHUNKS_NOT_SUPPORTED) && \
 438     !defined(PNG_NO_READ_ANCILLARY_CHUNKS)
 439 #define PNG_READ_ANCILLARY_CHUNKS_SUPPORTED
 440 #endif
 441 #if !defined(PNG_WRITE_ANCILLARY_CHUNKS_NOT_SUPPORTED) && \
 442     !defined(PNG_NO_WRITE_ANCILLARY_CHUNKS)
 443 #define PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
 444 #endif
 445
 446 #ifdef PNG_READ_ANCILLARY_CHUNKS_SUPPORTED
 447 #ifndef PNG_NO_READ_bKGD
 448 #define PNG_READ_bKGD_SUPPORTED
 449 #endif
 450 #ifndef PNG_NO_READ_cHRM
 451 #define PNG_READ_cHRM_SUPPORTED
 452 #endif
 453 #ifndef PNG_NO_READ_gAMA
 454 #define PNG_READ_gAMA_SUPPORTED
 455 #endif
 456 #ifndef PNG_NO_READ_hIST
 457 #define PNG_READ_hIST_SUPPORTED
 458 #endif
 459 #ifndef PNG_NO_READ_oFFs
 460 #define PNG_READ_oFFs_SUPPORTED
 461 #endif
 462 #ifndef PNG_NO_READ_pCAL
 463 #define PNG_READ_pCAL_SUPPORTED
 464 #endif
 465 #ifndef PNG_NO_READ_pHYs
 466 #define PNG_READ_pHYs_SUPPORTED
 467 #endif
 468 #ifndef PNG_NO_READ_sBIT
 469 #define PNG_READ_sBIT_SUPPORTED
 470 #endif
 471 #ifndef PNG_NO_READ_sRGB
 472 #define PNG_READ_sRGB_SUPPORTED
 473 #endif
 474 #ifndef PNG_NO_READ_tEXt
 475 #define PNG_READ_tEXt_SUPPORTED
 476 #endif
 477 #ifndef PNG_NO_READ_tIME
 478 #define PNG_READ_tIME_SUPPORTED
 479 #endif
 480 #ifndef PNG_NO_READ_tRNS
 481 #define PNG_READ_tRNS_SUPPORTED
 482 #endif
 483 #ifndef PNG_NO_READ_zTXt
 484 #define PNG_READ_zTXt_SUPPORTED
 485 #endif
 486 #ifndef PNG_NO_READ_OPT_PLTE
 487 #define PNG_READ_OPT_PLTE_SUPPORTED /* only affects support of the optional */
 488 #endif                              /* PLTE chunk in RGB and RGBA images */
 489 #endif /* PNG_READ_ANCILLARY_CHUNKS_SUPPORTED */
 490
 491 #ifdef PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
 492 #ifndef PNG_NO_WRITE_bKGD
 493 #define PNG_WRITE_bKGD_SUPPORTED
 494 #endif
 495 #ifndef PNG_NO_WRITE_cHRM
 496 #define PNG_WRITE_cHRM_SUPPORTED
 497 #endif
 498 #ifndef PNG_NO_WRITE_gAMA
 499 #define PNG_WRITE_gAMA_SUPPORTED
 500 #endif
 501 #ifndef PNG_NO_WRITE_hIST
 502 #define PNG_WRITE_hIST_SUPPORTED
 503 #endif
 504 #ifndef PNG_NO_WRITE_oFFs
 505 #define PNG_WRITE_oFFs_SUPPORTED
 506 #endif
 507 #ifndef PNG_NO_WRITE_pCAL
 508 #define PNG_WRITE_pCAL_SUPPORTED
 509 #endif
 510 #ifndef PNG_NO_WRITE_pHYs
 511 #define PNG_WRITE_pHYs_SUPPORTED
 512 #endif
 513 #ifndef PNG_NO_WRITE_sBIT
 514 #define PNG_WRITE_sBIT_SUPPORTED
 515 #endif
 516 #ifndef PNG_NO_WRITE_sRGB
 517 #define PNG_WRITE_sRGB_SUPPORTED
 518 #endif
 519 #ifndef PNG_NO_WRITE_tEXt
 520 #define PNG_WRITE_tEXt_SUPPORTED
 521 #endif
 522 #ifndef PNG_NO_WRITE_tIME
 523 #define PNG_WRITE_tIME_SUPPORTED
 524 #endif
 525 #ifndef PNG_NO_WRITE_tRNS
 526 #define PNG_WRITE_tRNS_SUPPORTED
 527 #endif
 528 #ifndef PNG_NO_WRITE_zTXt
 529 #define PNG_WRITE_zTXt_SUPPORTED
 530 #endif
 531 #endif /* PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED */
 532
 533 /* need the time information for reading tIME chunks */
 534 #if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_tIME_SUPPORTED)
 535 #include <time.h>
 536 #endif
 537
 538 /* Some typedefs to get us started.  These should be safe on most of the
 539  * common platforms.  The typedefs should be at least as large as the
 540  * numbers suggest (a png_uint_32 must be at least 32 bits long), but they
 541  * don't have to be exactly that size.  Some compilers dislike passing
 542  * unsigned shorts as function parameters, so you may be better off using
 543  * unsigned int for png_uint_16.  Likewise, for 64-bit systems, you may
 544  * want to have unsigned int for png_uint_32 instead of unsigned long.
 545  */
 546
 547 typedef unsigned long png_uint_32;
 548 typedef long png_int_32;
 549 typedef unsigned short png_uint_16;
 550 typedef short png_int_16;
 551 typedef unsigned char png_byte;
 552
 553 /* This is usually size_t.  It is typedef'ed just in case you need it to
 554    change (I'm not sure if you will or not, so I thought I'd be safe) */
 555 typedef size_t png_size_t;
 556
 557 /* The following is needed for medium model support.  It cannot be in the
 558  * PNG_INTERNAL section.  Needs modification for other compilers besides
 559  * MSC.  Model independent support declares all arrays and pointers to be
 560  * large using the far keyword.  The zlib version used must also support
 561  * model independent data.  As of version zlib 1.0.4, the necessary changes
 562  * have been made in zlib.  The USE_FAR_KEYWORD define triggers other
 563  * changes that are needed. (Tim Wegner)
 564  */
 565
 566 /* Separate compiler dependencies (problem here is that zlib.h always
 567    defines FAR. (SJT) */
 568 #ifdef __BORLANDC__
 569 #if defined(__LARGE__) || defined(__HUGE__) || defined(__COMPACT__)
 570 #define LDATA 1
 571 #else
 572 #define LDATA 0
 573 #endif
 574
 575 #if !defined(__WIN32__) && !defined(__FLAT__)
 576 #define PNG_MAX_MALLOC_64K
 577 #if (LDATA != 1)
 578 #ifndef FAR
 579 #define FAR __far
 580 #endif
 581 #define USE_FAR_KEYWORD
 582 #endif   /* LDATA != 1 */
 583
 584 /* Possibly useful for moving data out of default segment.
 585  * Uncomment it if you want. Could also define FARDATA as
 586  * const if your compiler supports it. (SJT)
 587 #  define FARDATA FAR
 588  */
 589 #endif  /* __WIN32__, __FLAT__ */
 590
 591 #endif   /* __BORLANDC__ */
 592
 593
 594 /* Suggest testing for specific compiler first before testing for
 595  * FAR.  The Watcom compiler defines both __MEDIUM__ and M_I86MM,
 596  * making reliance oncertain keywords suspect. (SJT)
 597  */
 598
 599 /* MSC Medium model */
 600 #if defined(FAR)
 601 #  if defined(M_I86MM)
 602 #     define USE_FAR_KEYWORD
 603 #     define FARDATA FAR
 604 #     include <dos.h>
 605 #  endif
 606 #endif
 607
 608 /* SJT: default case */
 609 #ifndef FAR
 610 #   define FAR
 611 #endif
 612
 613 /* At this point FAR is always defined */
 614 #ifndef FARDATA
 615 #define FARDATA
 616 #endif
 617
 618 /* Add typedefs for pointers */
 619 typedef void            FAR * png_voidp;
 620 typedef png_byte        FAR * png_bytep;
 621 typedef png_uint_32     FAR * png_uint_32p;
 622 typedef png_int_32      FAR * png_int_32p;
 623 typedef png_uint_16     FAR * png_uint_16p;
 624 typedef png_int_16      FAR * png_int_16p;
 625 typedef PNG_CONST char  FAR * png_const_charp;
 626 typedef char            FAR * png_charp;
 627 typedef double          FAR * png_doublep;
 628
 629 /* Pointers to pointers; i.e. arrays */
 630 typedef png_byte        FAR * FAR * png_bytepp;
 631 typedef png_uint_32     FAR * FAR * png_uint_32pp;
 632 typedef png_int_32      FAR * FAR * png_int_32pp;
 633 typedef png_uint_16     FAR * FAR * png_uint_16pp;
 634 typedef png_int_16      FAR * FAR * png_int_16pp;
 635 typedef PNG_CONST char  FAR * FAR * png_const_charpp;
 636 typedef char            FAR * FAR * png_charpp;
 637 typedef double          FAR * FAR * png_doublepp;
 638
 639 /* Pointers to pointers to pointers; i.e. pointer to array */
 640 typedef char            FAR * FAR * FAR * png_charppp;
 641
 642 /* libpng typedefs for types in zlib. If zlib changes
 643  * or another compression library is used, then change these.
 644  * Eliminates need to change all the source files.
 645  */
 646 typedef charf *         png_zcharp;
 647 typedef charf * FAR *   png_zcharpp;
 648 typedef z_stream FAR *  png_zstreamp;
 649
 650 /* allow for compilation as dll under MS Windows */
 651 #ifdef __WIN32DLL__
 652 #define PNG_EXPORT(type,symbol) __declspec(dllexport) type symbol
 653 #endif
 654
 655 /* allow for compilation as dll with BORLAND C++ 5.0 */
 656 #if defined(__BORLANDC__) && defined(_Windows) && defined(__DLL__)
 657 #   define PNG_EXPORT(type,symbol) type _export symbol
 658 #endif
 659
 660 /* allow for compilation as shared lib under BeOS */
 661 #ifdef __BEOSDLL__
 662 #define PNG_EXPORT(type,symbol) __declspec(export) type symbol
 663 #endif
 664
 665 #ifndef PNG_EXPORT
 666 #define PNG_EXPORT(type,symbol) type symbol
 667 #endif
 668
 669
 670 /* User may want to use these so not in PNG_INTERNAL. Any library functions
 671  * that are passed far data must be model independent.
 672  */
 673
 674 #if defined(USE_FAR_KEYWORD)  /* memory model independent fns */
 675 /* use this to make far-to-near assignments */
 676 #   define CHECK   1
 677 #   define NOCHECK 0
 678 #   define CVT_PTR(ptr) (png_far_to_near(png_ptr,ptr,CHECK))
 679 #   define CVT_PTR_NOCHECK(ptr) (png_far_to_near(png_ptr,ptr,NOCHECK))
 680 #   define png_strcpy _fstrcpy
 681 #   define png_strlen _fstrlen
 682 #   define png_memcmp _fmemcmp      /* SJT: added */
 683 #   define png_memcpy _fmemcpy
 684 #   define png_memset _fmemset
 685 #else /* use the usual functions */
 686 #   define CVT_PTR(ptr)         (ptr)
 687 #   define CVT_PTR_NOCHECK(ptr) (ptr)
 688 #   define png_strcpy strcpy
 689 #   define png_strlen strlen
 690 #   define png_memcmp memcmp     /* SJT: added */
 691 #   define png_memcpy memcpy
 692 #   define png_memset memset
 693 #endif
 694 /* End of memory model independent support */
 695
 696 /* Just a double check that someone hasn't tried to define something
 697  * contradictory.
 698  */
 699 #if (PNG_ZBUF_SIZE > 65536) && defined(PNG_MAX_MALLOC_64K)
 700 #undef PNG_ZBUF_SIZE
 701 #define PNG_ZBUF_SIZE 65536
 702 #endif
 703
 704 #endif /* PNGCONF_H */
 705