1 2 /* pngpriv.h - private declarations for use inside libpng 3 * 4 * For conditions of distribution and use, see copyright notice in png.h 5 * Copyright (c) 1998-2014 Glenn Randers-Pehrson 6 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) 7 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) 8 * 9 * Last changed in libpng 1.6.10 [March 6, 1014]] 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 16 /* The symbols declared in this file (including the functions declared 17 * as extern) are PRIVATE. They are not part of the libpng public 18 * interface, and are not recommended for use by regular applications. 19 * Some of them may become public in the future; others may stay private, 20 * change in an incompatible way, or even disappear. 21 * Although the libpng users are not forbidden to include this header, 22 * they should be well aware of the issues that may arise from doing so. 23 */ 24 25 #ifndef PNGPRIV_H 26 #define PNGPRIV_H 27 28 /* Feature Test Macros. The following are defined here to ensure that correctly 29 * implemented libraries reveal the APIs libpng needs to build and hide those 30 * that are not needed and potentially damaging to the compilation. 31 * 32 * Feature Test Macros must be defined before any system header is included (see 33 * POSIX 1003.1 2.8.2 "POSIX Symbols." 34 * 35 * These macros only have an effect if the operating system supports either 36 * POSIX 1003.1 or C99, or both. On other operating systems (particularly 37 * Windows/Visual Studio) there is no effect; the OS specific tests below are 38 * still required (as of 2011-05-02.) 39 */ 40 #define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */ 41 42 #ifndef PNG_VERSION_INFO_ONLY 43 /* Standard library headers not required by png.h: */ 44 # include <stdlib.h> 45 # include <string.h> 46 #endif 47 48 #define PNGLIB_BUILD /*libpng is being built, not used*/ 49 50 /* If HAVE_CONFIG_H is defined during the build then the build system must 51 * provide an appropriate "config.h" file on the include path. The header file 52 * must provide definitions as required below (search for "HAVE_CONFIG_H"); 53 * see configure.ac for more details of the requirements. The macro 54 * "PNG_NO_CONFIG_H" is provided for maintainers to test for dependencies on 55 * 'configure'; define this macro to prevent the configure build including the 56 * configure generated config.h. Libpng is expected to compile without *any* 57 * special build system support on a reasonably ANSI-C compliant system. 58 */ 59 #if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H) 60 # include <config.h> 61 62 /* Pick up the definition of 'restrict' from config.h if it was read: */ 63 # define PNG_RESTRICT restrict 64 #endif 65 66 /* To support symbol prefixing it is necessary to know *before* including png.h 67 * whether the fixed point (and maybe other) APIs are exported, because if they 68 * are not internal definitions may be required. This is handled below just 69 * before png.h is included, but load the configuration now if it is available. 70 */ 71 #ifndef PNGLCONF_H 72 # include "pnglibconf.h" 73 #endif 74 75 /* Local renames may change non-exported API functions from png.h */ 76 #if defined(PNG_PREFIX) && !defined(PNGPREFIX_H) 77 # include "pngprefix.h" 78 #endif 79 80 #ifdef PNG_USER_CONFIG 81 # include "pngusr.h" 82 /* These should have been defined in pngusr.h */ 83 # ifndef PNG_USER_PRIVATEBUILD 84 # define PNG_USER_PRIVATEBUILD "Custom libpng build" 85 # endif 86 # ifndef PNG_USER_DLLFNAME_POSTFIX 87 # define PNG_USER_DLLFNAME_POSTFIX "Cb" 88 # endif 89 #endif 90 91 /* Compile time options. 92 * ===================== 93 * In a multi-arch build the compiler may compile the code several times for the 94 * same object module, producing different binaries for different architectures. 95 * When this happens configure-time setting of the target host options cannot be 96 * done and this interferes with the handling of the ARM NEON optimizations, and 97 * possibly other similar optimizations. Put additional tests here; in general 98 * this is needed when the same option can be changed at both compile time and 99 * run time depending on the target OS (i.e. iOS vs Android.) 100 * 101 * NOTE: symbol prefixing does not pass $(CFLAGS) to the preprocessor, because 102 * this is not possible with certain compilers (Oracle SUN OS CC), as a result 103 * it is necessary to ensure that all extern functions that *might* be used 104 * regardless of $(CFLAGS) get declared in this file. The test on __ARM_NEON__ 105 * below is one example of this behavior because it is controlled by the 106 * presence or not of -mfpu=neon on the GCC command line, it is possible to do 107 * this in $(CC), e.g. "CC=gcc -mfpu=neon", but people who build libpng rarely 108 * do this. 109 */ 110 #ifndef PNG_ARM_NEON_OPT 111 /* ARM NEON optimizations are being controlled by the compiler settings, 112 * typically the target FPU. If the FPU has been set to NEON (-mfpu=neon 113 * with GCC) then the compiler will define __ARM_NEON__ and we can rely 114 * unconditionally on NEON instructions not crashing, otherwise we must 115 * disable use of NEON instructions. 116 * 117 * NOTE: at present these optimizations depend on 'ALIGNED_MEMORY', so they 118 * can only be turned on automatically if that is supported too. If 119 * PNG_ARM_NEON_OPT is set in CPPFLAGS (to >0) then arm/arm_init.c will fail 120 * to compile with an appropriate #error if ALIGNED_MEMORY has been turned 121 * off. 122 */ 123 # if defined(__ARM_NEON__) && defined(PNG_ALIGNED_MEMORY_SUPPORTED) 124 # define PNG_ARM_NEON_OPT 2 125 # else 126 # define PNG_ARM_NEON_OPT 0 127 # endif 128 #endif 129 130 #if PNG_ARM_NEON_OPT > 0 131 /* NEON optimizations are to be at least considered by libpng, so enable the 132 * callbacks to do this. 133 */ 134 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_neon 135 136 /* By default the 'intrinsics' code in arm/filter_neon_intrinsics.c is used 137 * if possible - if __ARM_NEON__ is set and the compiler version is not known 138 * to be broken. This is controlled by PNG_ARM_NEON_IMPLEMENTATION which can 139 * be: 140 * 141 * 1 The intrinsics code (the default with __ARM_NEON__) 142 * 2 The hand coded assembler (the default without __ARM_NEON__) 143 * 144 * It is possible to set PNG_ARM_NEON_IMPLEMENTATION in CPPFLAGS, however 145 * this is *NOT* supported and may cease to work even after a minor revision 146 * to libpng. It *is* valid to do this for testing purposes, e.g. speed 147 * testing or a new compiler, but the results should be communicated to the 148 * libpng implementation list for incorporation in the next minor release. 149 */ 150 # ifndef PNG_ARM_NEON_IMPLEMENTATION 151 # ifdef __ARM_NEON__ 152 # if defined(__clang__) 153 /* At present it is unknown by the libpng developers which versions 154 * of clang support the intrinsics, however some or perhaps all 155 * versions do not work with the assembler so this may be 156 * irrelevant, so just use the default (do nothing here.) 157 */ 158 # elif defined(__GNUC__) 159 /* GCC 4.5.4 NEON support is known to be broken. 4.6.3 is known to 160 * work, so if this *is* GCC, or G++, look for a version >4.5 161 */ 162 # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6) 163 # define PNG_ARM_NEON_IMPLEMENTATION 2 164 # endif /* no GNUC support */ 165 # endif /* __GNUC__ */ 166 # else /* !defined __ARM_NEON__ */ 167 /* The 'intrinsics' code simply won't compile without this -mfpu=neon: 168 */ 169 # define PNG_ARM_NEON_IMPLEMENTATION 2 170 # endif /* __ARM_NEON__ */ 171 # endif /* !defined PNG_ARM_NEON_IMPLEMENTATION */ 172 173 # ifndef PNG_ARM_NEON_IMPLEMENTATION 174 /* Use the intrinsics code by default. */ 175 # define PNG_ARM_NEON_IMPLEMENTATION 1 176 # endif 177 #endif /* PNG_ARM_NEON_OPT > 0 */ 178 179 /* Is this a build of a DLL where compilation of the object modules requires 180 * different preprocessor settings to those required for a simple library? If 181 * so PNG_BUILD_DLL must be set. 182 * 183 * If libpng is used inside a DLL but that DLL does not export the libpng APIs 184 * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a 185 * static library of libpng then link the DLL against that. 186 */ 187 #ifndef PNG_BUILD_DLL 188 # ifdef DLL_EXPORT 189 /* This is set by libtool when files are compiled for a DLL; libtool 190 * always compiles twice, even on systems where it isn't necessary. Set 191 * PNG_BUILD_DLL in case it is necessary: 192 */ 193 # define PNG_BUILD_DLL 194 # else 195 # ifdef _WINDLL 196 /* This is set by the Microsoft Visual Studio IDE in projects that 197 * build a DLL. It can't easily be removed from those projects (it 198 * isn't visible in the Visual Studio UI) so it is a fairly reliable 199 * indication that PNG_IMPEXP needs to be set to the DLL export 200 * attributes. 201 */ 202 # define PNG_BUILD_DLL 203 # else 204 # ifdef __DLL__ 205 /* This is set by the Borland C system when compiling for a DLL 206 * (as above.) 207 */ 208 # define PNG_BUILD_DLL 209 # else 210 /* Add additional compiler cases here. */ 211 # endif 212 # endif 213 # endif 214 #endif /* Setting PNG_BUILD_DLL if required */ 215 216 /* See pngconf.h for more details: the builder of the library may set this on 217 * the command line to the right thing for the specific compilation system or it 218 * may be automagically set above (at present we know of no system where it does 219 * need to be set on the command line.) 220 * 221 * PNG_IMPEXP must be set here when building the library to prevent pngconf.h 222 * setting it to the "import" setting for a DLL build. 223 */ 224 #ifndef PNG_IMPEXP 225 # ifdef PNG_BUILD_DLL 226 # define PNG_IMPEXP PNG_DLL_EXPORT 227 # else 228 /* Not building a DLL, or the DLL doesn't require specific export 229 * definitions. 230 */ 231 # define PNG_IMPEXP 232 # endif 233 #endif 234 235 /* No warnings for private or deprecated functions in the build: */ 236 #ifndef PNG_DEPRECATED 237 # define PNG_DEPRECATED 238 #endif 239 #ifndef PNG_PRIVATE 240 # define PNG_PRIVATE 241 #endif 242 243 /* Symbol preprocessing support. 244 * 245 * To enable listing global, but internal, symbols the following macros should 246 * always be used to declare an extern data or function object in this file. 247 */ 248 #ifndef PNG_INTERNAL_DATA 249 # define PNG_INTERNAL_DATA(type, name, array) extern type name array 250 #endif 251 252 #ifndef PNG_INTERNAL_FUNCTION 253 # define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\ 254 extern PNG_FUNCTION(type, name, args, PNG_EMPTY attributes) 255 #endif 256 257 #ifndef PNG_INTERNAL_CALLBACK 258 # define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\ 259 extern PNG_FUNCTION(type, (PNGCBAPI name), args, PNG_EMPTY attributes) 260 #endif 261 262 /* If floating or fixed point APIs are disabled they may still be compiled 263 * internally. To handle this make sure they are declared as the appropriate 264 * internal extern function (otherwise the symbol prefixing stuff won't work and 265 * the functions will be used without definitions.) 266 * 267 * NOTE: although all the API functions are declared here they are not all 268 * actually built! Because the declarations are still made it is necessary to 269 * fake out types that they depend on. 270 */ 271 #ifndef PNG_FP_EXPORT 272 # ifndef PNG_FLOATING_POINT_SUPPORTED 273 # define PNG_FP_EXPORT(ordinal, type, name, args)\ 274 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 275 # ifndef PNG_VERSION_INFO_ONLY 276 typedef struct png_incomplete png_double; 277 typedef png_double* png_doublep; 278 typedef const png_double* png_const_doublep; 279 typedef png_double** png_doublepp; 280 # endif 281 # endif 282 #endif 283 #ifndef PNG_FIXED_EXPORT 284 # ifndef PNG_FIXED_POINT_SUPPORTED 285 # define PNG_FIXED_EXPORT(ordinal, type, name, args)\ 286 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 287 # endif 288 #endif 289 290 #include "png.h" 291 292 /* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */ 293 #ifndef PNG_DLL_EXPORT 294 # define PNG_DLL_EXPORT 295 #endif 296 297 /* SECURITY and SAFETY: 298 * 299 * By default libpng is built without any internal limits on image size, 300 * individual heap (png_malloc) allocations or the total amount of memory used. 301 * If PNG_SAFE_LIMITS_SUPPORTED is defined, however, the limits below are used 302 * (unless individually overridden). These limits are believed to be fairly 303 * safe, but builders of secure systems should verify the values against the 304 * real system capabilities. 305 */ 306 #ifdef PNG_SAFE_LIMITS_SUPPORTED 307 /* 'safe' limits */ 308 # ifndef PNG_USER_WIDTH_MAX 309 # define PNG_USER_WIDTH_MAX 1000000 310 # endif 311 # ifndef PNG_USER_HEIGHT_MAX 312 # define PNG_USER_HEIGHT_MAX 1000000 313 # endif 314 # ifndef PNG_USER_CHUNK_CACHE_MAX 315 # define PNG_USER_CHUNK_CACHE_MAX 128 316 # endif 317 # ifndef PNG_USER_CHUNK_MALLOC_MAX 318 # define PNG_USER_CHUNK_MALLOC_MAX 8000000 319 # endif 320 #else 321 /* values for no limits */ 322 # ifndef PNG_USER_WIDTH_MAX 323 # define PNG_USER_WIDTH_MAX 0x7fffffff 324 # endif 325 # ifndef PNG_USER_HEIGHT_MAX 326 # define PNG_USER_HEIGHT_MAX 0x7fffffff 327 # endif 328 # ifndef PNG_USER_CHUNK_CACHE_MAX 329 # define PNG_USER_CHUNK_CACHE_MAX 0 330 # endif 331 # ifndef PNG_USER_CHUNK_MALLOC_MAX 332 # define PNG_USER_CHUNK_MALLOC_MAX 0 333 # endif 334 #endif 335 336 /* Moved to pngpriv.h at libpng-1.5.0 */ 337 /* NOTE: some of these may have been used in external applications as 338 * these definitions were exposed in pngconf.h prior to 1.5. 339 */ 340 341 /* If you are running on a machine where you cannot allocate more 342 * than 64K of memory at once, uncomment this. While libpng will not 343 * normally need that much memory in a chunk (unless you load up a very 344 * large file), zlib needs to know how big of a chunk it can use, and 345 * libpng thus makes sure to check any memory allocation to verify it 346 * will fit into memory. 347 * 348 * zlib provides 'MAXSEG_64K' which, if defined, indicates the 349 * same limit and pngconf.h (already included) sets the limit 350 * if certain operating systems are detected. 351 */ 352 #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K) 353 # define PNG_MAX_MALLOC_64K 354 #endif 355 356 #ifndef PNG_UNUSED 357 /* Unused formal parameter warnings are silenced using the following macro 358 * which is expected to have no bad effects on performance (optimizing 359 * compilers will probably remove it entirely). Note that if you replace 360 * it with something other than whitespace, you must include the terminating 361 * semicolon. 362 */ 363 # define PNG_UNUSED(param) (void)param; 364 #endif 365 366 /* Just a little check that someone hasn't tried to define something 367 * contradictory. 368 */ 369 #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K) 370 # undef PNG_ZBUF_SIZE 371 # define PNG_ZBUF_SIZE 65536L 372 #endif 373 374 /* If warnings or errors are turned off the code is disabled or redirected here. 375 * From 1.5.4 functions have been added to allow very limited formatting of 376 * error and warning messages - this code will also be disabled here. 377 */ 378 #ifdef PNG_WARNINGS_SUPPORTED 379 # define PNG_WARNING_PARAMETERS(p) png_warning_parameters p; 380 #else 381 # define png_warning_parameter(p,number,string) ((void)0) 382 # define png_warning_parameter_unsigned(p,number,format,value) ((void)0) 383 # define png_warning_parameter_signed(p,number,format,value) ((void)0) 384 # define png_formatted_warning(pp,p,message) ((void)(pp)) 385 # define PNG_WARNING_PARAMETERS(p) 386 #endif 387 #ifndef PNG_ERROR_TEXT_SUPPORTED 388 # define png_fixed_error(s1,s2) png_err(s1) 389 #endif 390 391 /* C allows up-casts from (void*) to any pointer and (const void*) to any 392 * pointer to a const object. C++ regards this as a type error and requires an 393 * explicit, static, cast and provides the static_cast<> rune to ensure that 394 * const is not cast away. 395 */ 396 #ifdef __cplusplus 397 # define png_voidcast(type, value) static_cast<type>(value) 398 # define png_constcast(type, value) const_cast<type>(value) 399 # define png_aligncast(type, value) \ 400 static_cast<type>(static_cast<void*>(value)) 401 # define png_aligncastconst(type, value) \ 402 static_cast<type>(static_cast<const void*>(value)) 403 #else 404 # define png_voidcast(type, value) (value) 405 # define png_constcast(type, value) ((type)(value)) 406 # define png_aligncast(type, value) ((void*)(value)) 407 # define png_aligncastconst(type, value) ((const void*)(value)) 408 #endif /* __cplusplus */ 409 410 /* Some fixed point APIs are still required even if not exported because 411 * they get used by the corresponding floating point APIs. This magic 412 * deals with this: 413 */ 414 #ifdef PNG_FIXED_POINT_SUPPORTED 415 # define PNGFAPI PNGAPI 416 #else 417 # define PNGFAPI /* PRIVATE */ 418 #endif 419 420 #ifndef PNG_VERSION_INFO_ONLY 421 /* Other defines specific to compilers can go here. Try to keep 422 * them inside an appropriate ifdef/endif pair for portability. 423 */ 424 #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\ 425 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) 426 /* png.c requires the following ANSI-C constants if the conversion of 427 * floating point to ASCII is implemented therein: 428 * 429 * DBL_DIG Maximum number of decimal digits (can be set to any constant) 430 * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value) 431 * DBL_MAX Maximum floating point number (can be set to an arbitrary value) 432 */ 433 # include <float.h> 434 435 # if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \ 436 defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC) 437 /* We need to check that <math.h> hasn't already been included earlier 438 * as it seems it doesn't agree with <fp.h>, yet we should really use 439 * <fp.h> if possible. 440 */ 441 # if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__) 442 # include <fp.h> 443 # endif 444 # else 445 # include <math.h> 446 # endif 447 # if defined(_AMIGA) && defined(__SASC) && defined(_M68881) 448 /* Amiga SAS/C: We must include builtin FPU functions when compiling using 449 * MATH=68881 450 */ 451 # include <m68881.h> 452 # endif 453 #endif 454 455 /* This provides the non-ANSI (far) memory allocation routines. */ 456 #if defined(__TURBOC__) && defined(__MSDOS__) 457 # include <mem.h> 458 # include <alloc.h> 459 #endif 460 461 #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \ 462 defined(_WIN32) || defined(__WIN32__) 463 # include <windows.h> /* defines _WINDOWS_ macro */ 464 #endif 465 #endif /* PNG_VERSION_INFO_ONLY */ 466 467 /* Moved here around 1.5.0beta36 from pngconf.h */ 468 /* Users may want to use these so they are not private. Any library 469 * functions that are passed far data must be model-independent. 470 */ 471 472 /* Memory model/platform independent fns */ 473 #ifndef PNG_ABORT 474 # ifdef _WINDOWS_ 475 # define PNG_ABORT() ExitProcess(0) 476 # else 477 # define PNG_ABORT() abort() 478 # endif 479 #endif 480 481 /* These macros may need to be architecture dependent. */ 482 #define PNG_ALIGN_NONE 0 /* do not use data alignment */ 483 #define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */ 484 #ifdef offsetof 485 # define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */ 486 #else 487 # define PNG_ALIGN_OFFSET -1 /* prevent the use of this */ 488 #endif 489 #define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */ 490 491 #ifndef PNG_ALIGN_TYPE 492 /* Default to using aligned access optimizations and requiring alignment to a 493 * multiple of the data type size. Override in a compiler specific fashion 494 * if necessary by inserting tests here: 495 */ 496 # define PNG_ALIGN_TYPE PNG_ALIGN_SIZE 497 #endif 498 499 #if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE 500 /* This is used because in some compiler implementations non-aligned 501 * structure members are supported, so the offsetof approach below fails. 502 * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access 503 * is good for performance. Do not do this unless you have tested the result 504 * and understand it. 505 */ 506 # define png_alignof(type) (sizeof (type)) 507 #else 508 # if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET 509 # define png_alignof(type) offsetof(struct{char c; type t;}, t) 510 # else 511 # if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS 512 # define png_alignof(type) (1) 513 # endif 514 /* Else leave png_alignof undefined to prevent use thereof */ 515 # endif 516 #endif 517 518 /* This implicitly assumes alignment is always to a power of 2. */ 519 #ifdef png_alignof 520 # define png_isaligned(ptr, type)\ 521 ((((const char*)ptr-(const char*)0) & (png_alignof(type)-1)) == 0) 522 #else 523 # define png_isaligned(ptr, type) 0 524 #endif 525 526 /* End of memory model/platform independent support */ 527 /* End of 1.5.0beta36 move from pngconf.h */ 528 529 /* CONSTANTS and UTILITY MACROS 530 * These are used internally by libpng and not exposed in the API 531 */ 532 533 /* Various modes of operation. Note that after an init, mode is set to 534 * zero automatically when the structure is created. Three of these 535 * are defined in png.h because they need to be visible to applications 536 * that call png_set_unknown_chunk(). 537 */ 538 /* #define PNG_HAVE_IHDR 0x01 (defined in png.h) */ 539 /* #define PNG_HAVE_PLTE 0x02 (defined in png.h) */ 540 #define PNG_HAVE_IDAT 0x04 541 /* #define PNG_AFTER_IDAT 0x08 (defined in png.h) */ 542 #define PNG_HAVE_IEND 0x10 543 /* 0x20 (unused) */ 544 /* 0x40 (unused) */ 545 /* 0x80 (unused) */ 546 #define PNG_HAVE_CHUNK_HEADER 0x100 547 #define PNG_WROTE_tIME 0x200 548 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400 549 #define PNG_BACKGROUND_IS_GRAY 0x800 550 #define PNG_HAVE_PNG_SIGNATURE 0x1000 551 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ 552 /* 0x4000 (unused) */ 553 #define PNG_IS_READ_STRUCT 0x8000 /* Else is a write struct */ 554 555 /* Flags for the transformations the PNG library does on the image data */ 556 #define PNG_BGR 0x0001 557 #define PNG_INTERLACE 0x0002 558 #define PNG_PACK 0x0004 559 #define PNG_SHIFT 0x0008 560 #define PNG_SWAP_BYTES 0x0010 561 #define PNG_INVERT_MONO 0x0020 562 #define PNG_QUANTIZE 0x0040 563 #define PNG_COMPOSE 0x0080 /* Was PNG_BACKGROUND */ 564 #define PNG_BACKGROUND_EXPAND 0x0100 565 #define PNG_EXPAND_16 0x0200 /* Added to libpng 1.5.2 */ 566 #define PNG_16_TO_8 0x0400 /* Becomes 'chop' in 1.5.4 */ 567 #define PNG_RGBA 0x0800 568 #define PNG_EXPAND 0x1000 569 #define PNG_GAMMA 0x2000 570 #define PNG_GRAY_TO_RGB 0x4000 571 #define PNG_FILLER 0x8000 572 #define PNG_PACKSWAP 0x10000 573 #define PNG_SWAP_ALPHA 0x20000 574 #define PNG_STRIP_ALPHA 0x40000 575 #define PNG_INVERT_ALPHA 0x80000 576 #define PNG_USER_TRANSFORM 0x100000 577 #define PNG_RGB_TO_GRAY_ERR 0x200000 578 #define PNG_RGB_TO_GRAY_WARN 0x400000 579 #define PNG_RGB_TO_GRAY 0x600000 /* two bits, RGB_TO_GRAY_ERR|WARN */ 580 #define PNG_ENCODE_ALPHA 0x800000 /* Added to libpng-1.5.4 */ 581 #define PNG_ADD_ALPHA 0x1000000 /* Added to libpng-1.2.7 */ 582 #define PNG_EXPAND_tRNS 0x2000000 /* Added to libpng-1.2.9 */ 583 #define PNG_SCALE_16_TO_8 0x4000000 /* Added to libpng-1.5.4 */ 584 /* 0x8000000 unused */ 585 /* 0x10000000 unused */ 586 /* 0x20000000 unused */ 587 /* 0x40000000 unused */ 588 /* Flags for png_create_struct */ 589 #define PNG_STRUCT_PNG 0x0001 590 #define PNG_STRUCT_INFO 0x0002 591 592 /* Scaling factor for filter heuristic weighting calculations */ 593 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) 594 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) 595 596 /* Flags for the png_ptr->flags rather than declaring a byte for each one */ 597 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 598 #define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002 /* Added to libpng-1.6.0 */ 599 /* 0x0004 unused */ 600 #define PNG_FLAG_ZSTREAM_ENDED 0x0008 /* Added to libpng-1.6.0 */ 601 /* 0x0010 unused */ 602 /* 0x0020 unused */ 603 #define PNG_FLAG_ROW_INIT 0x0040 604 #define PNG_FLAG_FILLER_AFTER 0x0080 605 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 606 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 607 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 608 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 609 #define PNG_FLAG_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.4 */ 610 #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.4 */ 611 #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.4 */ 612 /* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000 */ 613 /* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000 */ 614 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000 615 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000 616 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000 617 #define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000 /* Added to libpng-1.4.0 */ 618 #define PNG_FLAG_APP_WARNINGS_WARN 0x200000 /* Added to libpng-1.6.0 */ 619 #define PNG_FLAG_APP_ERRORS_WARN 0x400000 /* Added to libpng-1.6.0 */ 620 /* 0x800000 unused */ 621 /* 0x1000000 unused */ 622 /* 0x2000000 unused */ 623 /* 0x4000000 unused */ 624 /* 0x8000000 unused */ 625 /* 0x10000000 unused */ 626 /* 0x20000000 unused */ 627 /* 0x40000000 unused */ 628 629 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 630 PNG_FLAG_CRC_ANCILLARY_NOWARN) 631 632 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 633 PNG_FLAG_CRC_CRITICAL_IGNORE) 634 635 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 636 PNG_FLAG_CRC_CRITICAL_MASK) 637 638 /* Save typing and make code easier to understand */ 639 640 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 641 abs((int)((c1).green) - (int)((c2).green)) + \ 642 abs((int)((c1).blue) - (int)((c2).blue))) 643 644 /* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255 645 * by dividing by 257 *with rounding*. This macro is exact for the given range. 646 * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the 647 * macro were established by experiment (modifying the added value). The macro 648 * has a second variant that takes a value already scaled by 255 and divides by 649 * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it 650 * only gives off-by-one errors and only for 0.5% (1 in 200) of the values. 651 */ 652 #define PNG_DIV65535(v24) (((v24) + 32895) >> 16) 653 #define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255) 654 655 /* Added to libpng-1.2.6 JB */ 656 #define PNG_ROWBYTES(pixel_bits, width) \ 657 ((pixel_bits) >= 8 ? \ 658 ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \ 659 (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) ) 660 661 /* PNG_OUT_OF_RANGE returns true if value is outside the range 662 * ideal-delta..ideal+delta. Each argument is evaluated twice. 663 * "ideal" and "delta" should be constants, normally simple 664 * integers, "value" a variable. Added to libpng-1.2.6 JB 665 */ 666 #define PNG_OUT_OF_RANGE(value, ideal, delta) \ 667 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 668 669 /* Conversions between fixed and floating point, only defined if 670 * required (to make sure the code doesn't accidentally use float 671 * when it is supposedly disabled.) 672 */ 673 #ifdef PNG_FLOATING_POINT_SUPPORTED 674 /* The floating point conversion can't overflow, though it can and 675 * does lose accuracy relative to the original fixed point value. 676 * In practice this doesn't matter because png_fixed_point only 677 * stores numbers with very low precision. The png_ptr and s 678 * arguments are unused by default but are there in case error 679 * checking becomes a requirement. 680 */ 681 #define png_float(png_ptr, fixed, s) (.00001 * (fixed)) 682 683 /* The fixed point conversion performs range checking and evaluates 684 * its argument multiple times, so must be used with care. The 685 * range checking uses the PNG specification values for a signed 686 * 32 bit fixed point value except that the values are deliberately 687 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly 688 * (2^31-1) * 100000). 's' is a string that describes the value being 689 * converted. 690 * 691 * NOTE: this macro will raise a png_error if the range check fails, 692 * therefore it is normally only appropriate to use this on values 693 * that come from API calls or other sources where an out of range 694 * error indicates a programming error, not a data error! 695 * 696 * NOTE: by default this is off - the macro is not used - because the 697 * function call saves a lot of code. 698 */ 699 #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED 700 #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\ 701 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0)) 702 #endif 703 /* else the corresponding function is defined below, inside the scope of the 704 * cplusplus test. 705 */ 706 #endif 707 708 /* Constants for known chunk types. If you need to add a chunk, define the name 709 * here. For historical reasons these constants have the form png_<name>; i.e. 710 * the prefix is lower case. Please use decimal values as the parameters to 711 * match the ISO PNG specification and to avoid relying on the C locale 712 * interpretation of character values. 713 * 714 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values 715 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string 716 * to be generated if required. 717 * 718 * PNG_32b correctly produces a value shifted by up to 24 bits, even on 719 * architectures where (int) is only 16 bits. 720 */ 721 #define PNG_32b(b,s) ((png_uint_32)(b) << (s)) 722 #define PNG_U32(b1,b2,b3,b4) \ 723 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0)) 724 725 /* Constants for known chunk types. 726 * 727 * MAINTAINERS: If you need to add a chunk, define the name here. 728 * For historical reasons these constants have the form png_<name>; i.e. 729 * the prefix is lower case. Please use decimal values as the parameters to 730 * match the ISO PNG specification and to avoid relying on the C locale 731 * interpretation of character values. Please keep the list sorted. 732 * 733 * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk 734 * type. In fact the specification does not express chunk types this way, 735 * however using a 32-bit value means that the chunk type can be read from the 736 * stream using exactly the same code as used for a 32-bit unsigned value and 737 * can be examined far more efficiently (using one arithmetic compare). 738 * 739 * Prior to 1.5.6 the chunk type constants were expressed as C strings. The 740 * libpng API still uses strings for 'unknown' chunks and a macro, 741 * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice 742 * that for portable code numeric values must still be used; the string "IHDR" 743 * is not portable and neither is PNG_U32('I', 'H', 'D', 'R'). 744 * 745 * In 1.7.0 the definitions will be made public in png.h to avoid having to 746 * duplicate the same definitions in application code. 747 */ 748 #define png_IDAT PNG_U32( 73, 68, 65, 84) 749 #define png_IEND PNG_U32( 73, 69, 78, 68) 750 #define png_IHDR PNG_U32( 73, 72, 68, 82) 751 #define png_PLTE PNG_U32( 80, 76, 84, 69) 752 #define png_bKGD PNG_U32( 98, 75, 71, 68) 753 #define png_cHRM PNG_U32( 99, 72, 82, 77) 754 #define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */ 755 #define png_gAMA PNG_U32(103, 65, 77, 65) 756 #define png_gIFg PNG_U32(103, 73, 70, 103) 757 #define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */ 758 #define png_gIFx PNG_U32(103, 73, 70, 120) 759 #define png_hIST PNG_U32(104, 73, 83, 84) 760 #define png_iCCP PNG_U32(105, 67, 67, 80) 761 #define png_iTXt PNG_U32(105, 84, 88, 116) 762 #define png_oFFs PNG_U32(111, 70, 70, 115) 763 #define png_pCAL PNG_U32(112, 67, 65, 76) 764 #define png_pHYs PNG_U32(112, 72, 89, 115) 765 #define png_sBIT PNG_U32(115, 66, 73, 84) 766 #define png_sCAL PNG_U32(115, 67, 65, 76) 767 #define png_sPLT PNG_U32(115, 80, 76, 84) 768 #define png_sRGB PNG_U32(115, 82, 71, 66) 769 #define png_sTER PNG_U32(115, 84, 69, 82) 770 #define png_tEXt PNG_U32(116, 69, 88, 116) 771 #define png_tIME PNG_U32(116, 73, 77, 69) 772 #define png_tRNS PNG_U32(116, 82, 78, 83) 773 #define png_zTXt PNG_U32(122, 84, 88, 116) 774 775 /* The following will work on (signed char*) strings, whereas the get_uint_32 776 * macro will fail on top-bit-set values because of the sign extension. 777 */ 778 #define PNG_CHUNK_FROM_STRING(s)\ 779 PNG_U32(0xff&(s)[0], 0xff&(s)[1], 0xff&(s)[2], 0xff&(s)[3]) 780 781 /* This uses (char), not (png_byte) to avoid warnings on systems where (char) is 782 * signed and the argument is a (char[]) This macro will fail miserably on 783 * systems where (char) is more than 8 bits. 784 */ 785 #define PNG_STRING_FROM_CHUNK(s,c)\ 786 (void)(((char*)(s))[0]=(char)((c)>>24), ((char*)(s))[1]=(char)((c)>>16),\ 787 ((char*)(s))[2]=(char)((c)>>8), ((char*)(s))[3]=(char)((c))) 788 789 /* Do the same but terminate with a null character. */ 790 #define PNG_CSTRING_FROM_CHUNK(s,c)\ 791 (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0) 792 793 /* Test on flag values as defined in the spec (section 5.4): */ 794 #define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29)) 795 #define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c)) 796 #define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21)) 797 #define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13)) 798 #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5)) 799 800 /* Gamma values (new at libpng-1.5.4): */ 801 #define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */ 802 #define PNG_GAMMA_MAC_INVERSE 65909 803 #define PNG_GAMMA_sRGB_INVERSE 45455 804 805 /* Almost everything below is C specific; the #defines above can be used in 806 * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot. 807 */ 808 #ifndef PNG_VERSION_INFO_ONLY 809 810 #include "pngstruct.h" 811 #include "pnginfo.h" 812 813 /* Validate the include paths - the include path used to generate pnglibconf.h 814 * must match that used in the build, or we must be using pnglibconf.h.prebuilt: 815 */ 816 #if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM 817 # error ZLIB_VERNUM != PNG_ZLIB_VERNUM \ 818 "-I (include path) error: see the notes in pngpriv.h" 819 /* This means that when pnglibconf.h was built the copy of zlib.h that it 820 * used is not the same as the one being used here. Because the build of 821 * libpng makes decisions to use inflateInit2 and inflateReset2 based on the 822 * zlib version number and because this affects handling of certain broken 823 * PNG files the -I directives must match. 824 * 825 * The most likely explanation is that you passed a -I in CFLAGS. This will 826 * not work; all the preprocessor directories and in particular all the -I 827 * directives must be in CPPFLAGS. 828 */ 829 #endif 830 831 /* This is used for 16 bit gamma tables -- only the top level pointers are 832 * const; this could be changed: 833 */ 834 typedef const png_uint_16p * png_const_uint_16pp; 835 836 /* Added to libpng-1.5.7: sRGB conversion tables */ 837 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 838 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 839 #ifdef PNG_SIMPLIFIED_READ_SUPPORTED 840 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]); 841 /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value, 842 * 0..65535. This table gives the closest 16-bit answers (no errors). 843 */ 844 #endif 845 846 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]); 847 PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]); 848 849 #define PNG_sRGB_FROM_LINEAR(linear) ((png_byte)((png_sRGB_base[(linear)>>15] +\ 850 ((((linear)&0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8)) 851 /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB 852 * encoded value with maximum error 0.646365. Note that the input is not a 853 * 16-bit value; it has been multiplied by 255! */ 854 #endif /* PNG_SIMPLIFIED_READ/WRITE */ 855 856 857 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 858 #ifdef __cplusplus 859 extern "C" { 860 #endif /* __cplusplus */ 861 862 /* Internal functions; these are not exported from a DLL however because they 863 * are used within several of the C source files they have to be C extern. 864 * 865 * All of these functions must be declared with PNG_INTERNAL_FUNCTION. 866 */ 867 868 /* Zlib support */ 869 #define PNG_UNEXPECTED_ZLIB_RETURN (-7) 870 PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret), 871 PNG_EMPTY); 872 /* Used by the zlib handling functions to ensure that z_stream::msg is always 873 * set before they return. 874 */ 875 876 #ifdef PNG_WRITE_SUPPORTED 877 PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr, 878 png_compression_bufferp *list),PNG_EMPTY); 879 /* Free the buffer list used by the compressed write code. */ 880 #endif 881 882 #if defined(PNG_FLOATING_POINT_SUPPORTED) && \ 883 !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \ 884 (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \ 885 defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \ 886 defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \ 887 (defined(PNG_sCAL_SUPPORTED) && \ 888 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)) 889 PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr, 890 double fp, png_const_charp text),PNG_EMPTY); 891 #endif 892 893 /* Check the user version string for compatibility, returns false if the version 894 * numbers aren't compatible. 895 */ 896 PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr, 897 png_const_charp user_png_ver),PNG_EMPTY); 898 899 /* Internal base allocator - no messages, NULL on failure to allocate. This 900 * does, however, call the application provided allocator and that could call 901 * png_error (although that would be a bug in the application implementation.) 902 */ 903 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr, 904 png_alloc_size_t size),PNG_ALLOCATED); 905 906 #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\ 907 defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED) 908 /* Internal array allocator, outputs no error or warning messages on failure, 909 * just returns NULL. 910 */ 911 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr, 912 int nelements, size_t element_size),PNG_ALLOCATED); 913 914 /* The same but an existing array is extended by add_elements. This function 915 * also memsets the new elements to 0 and copies the old elements. The old 916 * array is not freed or altered. 917 */ 918 PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr, 919 png_const_voidp array, int old_elements, int add_elements, 920 size_t element_size),PNG_ALLOCATED); 921 #endif /* text, sPLT or unknown chunks */ 922 923 /* Magic to create a struct when there is no struct to call the user supplied 924 * memory allocators. Because error handling has not been set up the memory 925 * handlers can't safely call png_error, but this is an obscure and undocumented 926 * restriction so libpng has to assume that the 'free' handler, at least, might 927 * call png_error. 928 */ 929 PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct, 930 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, 931 png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, 932 png_free_ptr free_fn),PNG_ALLOCATED); 933 934 /* Free memory from internal libpng struct */ 935 PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr), 936 PNG_EMPTY); 937 938 /* Free an allocated jmp_buf (always succeeds) */ 939 PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY); 940 941 /* Function to allocate memory for zlib. PNGAPI is disallowed. */ 942 PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size), 943 PNG_ALLOCATED); 944 945 /* Function to free memory for zlib. PNGAPI is disallowed. */ 946 PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY); 947 948 /* Next four functions are used internally as callbacks. PNGCBAPI is required 949 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to 950 * PNGCBAPI at 1.5.0 951 */ 952 953 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr, 954 png_bytep data, png_size_t length),PNG_EMPTY); 955 956 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 957 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr, 958 png_bytep buffer, png_size_t length),PNG_EMPTY); 959 #endif 960 961 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr, 962 png_bytep data, png_size_t length),PNG_EMPTY); 963 964 #ifdef PNG_WRITE_FLUSH_SUPPORTED 965 # ifdef PNG_STDIO_SUPPORTED 966 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr), 967 PNG_EMPTY); 968 # endif 969 #endif 970 971 /* Reset the CRC variable */ 972 PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY); 973 974 /* Write the "data" buffer to whatever output you are using */ 975 PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr, 976 png_const_bytep data, png_size_t length),PNG_EMPTY); 977 978 /* Read and check the PNG file signature */ 979 PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr, 980 png_inforp info_ptr),PNG_EMPTY); 981 982 /* Read the chunk header (length + type name) */ 983 PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr), 984 PNG_EMPTY); 985 986 /* Read data from whatever input you are using into the "data" buffer */ 987 PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data, 988 png_size_t length),PNG_EMPTY); 989 990 /* Read bytes into buf, and update png_ptr->crc */ 991 PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf, 992 png_uint_32 length),PNG_EMPTY); 993 994 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 995 PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr, 996 png_uint_32 skip),PNG_EMPTY); 997 998 /* Read the CRC from the file and compare it to the libpng calculated CRC */ 999 PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY); 1000 1001 /* Calculate the CRC over a section of data. Note that we are only 1002 * passing a maximum of 64K on systems that have this as a memory limit, 1003 * since this is the maximum buffer size we can specify. 1004 */ 1005 PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr, 1006 png_const_bytep ptr, png_size_t length),PNG_EMPTY); 1007 1008 #ifdef PNG_WRITE_FLUSH_SUPPORTED 1009 PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY); 1010 #endif 1011 1012 /* Write various chunks */ 1013 1014 /* Write the IHDR chunk, and update the png_struct with the necessary 1015 * information. 1016 */ 1017 PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr, 1018 png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, 1019 int compression_method, int filter_method, int interlace_method),PNG_EMPTY); 1020 1021 PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr, 1022 png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY); 1023 1024 PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr, 1025 png_const_bytep row_data, png_alloc_size_t row_data_length, int flush), 1026 PNG_EMPTY); 1027 1028 PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY); 1029 1030 #ifdef PNG_WRITE_gAMA_SUPPORTED 1031 PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr, 1032 png_fixed_point file_gamma),PNG_EMPTY); 1033 #endif 1034 1035 #ifdef PNG_WRITE_sBIT_SUPPORTED 1036 PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr, 1037 png_const_color_8p sbit, int color_type),PNG_EMPTY); 1038 #endif 1039 1040 #ifdef PNG_WRITE_cHRM_SUPPORTED 1041 PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr, 1042 const png_xy *xy), PNG_EMPTY); 1043 /* The xy value must have been previously validated */ 1044 #endif 1045 1046 #ifdef PNG_WRITE_sRGB_SUPPORTED 1047 PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr, 1048 int intent),PNG_EMPTY); 1049 #endif 1050 1051 #ifdef PNG_WRITE_iCCP_SUPPORTED 1052 PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr, 1053 png_const_charp name, png_const_bytep profile), PNG_EMPTY); 1054 /* The profile must have been previously validated for correctness, the 1055 * length comes from the first four bytes. Only the base, deflate, 1056 * compression is supported. 1057 */ 1058 #endif 1059 1060 #ifdef PNG_WRITE_sPLT_SUPPORTED 1061 PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr, 1062 png_const_sPLT_tp palette),PNG_EMPTY); 1063 #endif 1064 1065 #ifdef PNG_WRITE_tRNS_SUPPORTED 1066 PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr, 1067 png_const_bytep trans, png_const_color_16p values, int number, 1068 int color_type),PNG_EMPTY); 1069 #endif 1070 1071 #ifdef PNG_WRITE_bKGD_SUPPORTED 1072 PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr, 1073 png_const_color_16p values, int color_type),PNG_EMPTY); 1074 #endif 1075 1076 #ifdef PNG_WRITE_hIST_SUPPORTED 1077 PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr, 1078 png_const_uint_16p hist, int num_hist),PNG_EMPTY); 1079 #endif 1080 1081 /* Chunks that have keywords */ 1082 #ifdef PNG_WRITE_tEXt_SUPPORTED 1083 PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr, 1084 png_const_charp key, png_const_charp text, png_size_t text_len),PNG_EMPTY); 1085 #endif 1086 1087 #ifdef PNG_WRITE_zTXt_SUPPORTED 1088 PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp 1089 key, png_const_charp text, png_size_t text_len, int compression),PNG_EMPTY); 1090 #endif 1091 1092 #ifdef PNG_WRITE_iTXt_SUPPORTED 1093 PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr, 1094 int compression, png_const_charp key, png_const_charp lang, 1095 png_const_charp lang_key, png_const_charp text),PNG_EMPTY); 1096 #endif 1097 1098 #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ 1099 PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr, 1100 png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY); 1101 #endif 1102 1103 #ifdef PNG_WRITE_oFFs_SUPPORTED 1104 PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr, 1105 png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY); 1106 #endif 1107 1108 #ifdef PNG_WRITE_pCAL_SUPPORTED 1109 PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr, 1110 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, 1111 png_const_charp units, png_charpp params),PNG_EMPTY); 1112 #endif 1113 1114 #ifdef PNG_WRITE_pHYs_SUPPORTED 1115 PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr, 1116 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 1117 int unit_type),PNG_EMPTY); 1118 #endif 1119 1120 #ifdef PNG_WRITE_tIME_SUPPORTED 1121 PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr, 1122 png_const_timep mod_time),PNG_EMPTY); 1123 #endif 1124 1125 #ifdef PNG_WRITE_sCAL_SUPPORTED 1126 PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr, 1127 int unit, png_const_charp width, png_const_charp height),PNG_EMPTY); 1128 #endif 1129 1130 /* Called when finished processing a row of data */ 1131 PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr), 1132 PNG_EMPTY); 1133 1134 /* Internal use only. Called before first row of data */ 1135 PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr), 1136 PNG_EMPTY); 1137 1138 /* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an 1139 * array of png_ptr->width pixels. If the image is not interlaced or this 1140 * is the final pass this just does a memcpy, otherwise the "display" flag 1141 * is used to determine whether to copy pixels that are not in the current pass. 1142 * 1143 * Because 'png_do_read_interlace' (below) replicates pixels this allows this 1144 * function to achieve the documented 'blocky' appearance during interlaced read 1145 * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row' 1146 * are not changed if they are not in the current pass, when display is 0. 1147 * 1148 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless. 1149 * 1150 * The API always reads from the png_struct row buffer and always assumes that 1151 * it is full width (png_do_read_interlace has already been called.) 1152 * 1153 * This function is only ever used to write to row buffers provided by the 1154 * caller of the relevant libpng API and the row must have already been 1155 * transformed by the read transformations. 1156 * 1157 * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed 1158 * bitmasks for use within the code, otherwise runtime generated masks are used. 1159 * The default is compile time masks. 1160 */ 1161 #ifndef PNG_USE_COMPILE_TIME_MASKS 1162 # define PNG_USE_COMPILE_TIME_MASKS 1 1163 #endif 1164 PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr, 1165 png_bytep row, int display),PNG_EMPTY); 1166 1167 #ifdef PNG_READ_INTERLACING_SUPPORTED 1168 /* Expand an interlaced row: the 'row_info' describes the pass data that has 1169 * been read in and must correspond to the pixels in 'row', the pixels are 1170 * expanded (moved apart) in 'row' to match the final layout, when doing this 1171 * the pixels are *replicated* to the intervening space. This is essential for 1172 * the correct operation of png_combine_row, above. 1173 */ 1174 PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info, 1175 png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY); 1176 #endif 1177 1178 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 1179 1180 #ifdef PNG_WRITE_INTERLACING_SUPPORTED 1181 /* Grab pixels out of a row for an interlaced pass */ 1182 PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info, 1183 png_bytep row, int pass),PNG_EMPTY); 1184 #endif 1185 1186 /* Unfilter a row: check the filter value before calling this, there is no point 1187 * calling it for PNG_FILTER_VALUE_NONE. 1188 */ 1189 PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop 1190 row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY); 1191 1192 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info, 1193 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1194 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop 1195 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1196 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop 1197 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1198 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop 1199 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1200 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop 1201 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1202 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop 1203 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1204 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop 1205 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1206 1207 /* Choose the best filter to use and filter the row data */ 1208 PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr, 1209 png_row_infop row_info),PNG_EMPTY); 1210 1211 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED 1212 PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr, 1213 png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY); 1214 /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer 1215 * is NULL the function checks, instead, for the end of the stream. In this 1216 * case a benign error will be issued if the stream end is not found or if 1217 * extra data has to be consumed. 1218 */ 1219 PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr), 1220 PNG_EMPTY); 1221 /* This cleans up when the IDAT LZ stream does not end when the last image 1222 * byte is read; there is still some pending input. 1223 */ 1224 1225 PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr), 1226 PNG_EMPTY); 1227 /* Finish a row while reading, dealing with interlacing passes, etc. */ 1228 #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ 1229 1230 /* Initialize the row buffers, etc. */ 1231 PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY); 1232 1233 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1234 /* Optional call to update the users info structure */ 1235 PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr, 1236 png_inforp info_ptr),PNG_EMPTY); 1237 #endif 1238 1239 /* Shared transform functions, defined in pngtran.c */ 1240 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 1241 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 1242 PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info, 1243 png_bytep row, int at_start),PNG_EMPTY); 1244 #endif 1245 1246 #ifdef PNG_16BIT_SUPPORTED 1247 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 1248 PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info, 1249 png_bytep row),PNG_EMPTY); 1250 #endif 1251 #endif 1252 1253 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ 1254 defined(PNG_WRITE_PACKSWAP_SUPPORTED) 1255 PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info, 1256 png_bytep row),PNG_EMPTY); 1257 #endif 1258 1259 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 1260 PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info, 1261 png_bytep row),PNG_EMPTY); 1262 #endif 1263 1264 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1265 PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info, 1266 png_bytep row),PNG_EMPTY); 1267 #endif 1268 1269 /* The following decodes the appropriate chunks, and does error correction, 1270 * then calls the appropriate callback for the chunk if it is valid. 1271 */ 1272 1273 /* Decode the IHDR chunk */ 1274 PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr, 1275 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1276 PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr, 1277 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1278 PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr, 1279 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1280 1281 #ifdef PNG_READ_bKGD_SUPPORTED 1282 PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr, 1283 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1284 #endif 1285 1286 #ifdef PNG_READ_cHRM_SUPPORTED 1287 PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr, 1288 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1289 #endif 1290 1291 #ifdef PNG_READ_gAMA_SUPPORTED 1292 PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr, 1293 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1294 #endif 1295 1296 #ifdef PNG_READ_hIST_SUPPORTED 1297 PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr, 1298 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1299 #endif 1300 1301 #ifdef PNG_READ_iCCP_SUPPORTED 1302 PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr, 1303 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1304 #endif /* PNG_READ_iCCP_SUPPORTED */ 1305 1306 #ifdef PNG_READ_iTXt_SUPPORTED 1307 PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr, 1308 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1309 #endif 1310 1311 #ifdef PNG_READ_oFFs_SUPPORTED 1312 PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr, 1313 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1314 #endif 1315 1316 #ifdef PNG_READ_pCAL_SUPPORTED 1317 PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr, 1318 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1319 #endif 1320 1321 #ifdef PNG_READ_pHYs_SUPPORTED 1322 PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr, 1323 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1324 #endif 1325 1326 #ifdef PNG_READ_sBIT_SUPPORTED 1327 PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr, 1328 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1329 #endif 1330 1331 #ifdef PNG_READ_sCAL_SUPPORTED 1332 PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr, 1333 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1334 #endif 1335 1336 #ifdef PNG_READ_sPLT_SUPPORTED 1337 PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr, 1338 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1339 #endif /* PNG_READ_sPLT_SUPPORTED */ 1340 1341 #ifdef PNG_READ_sRGB_SUPPORTED 1342 PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr, 1343 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1344 #endif 1345 1346 #ifdef PNG_READ_tEXt_SUPPORTED 1347 PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr, 1348 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1349 #endif 1350 1351 #ifdef PNG_READ_tIME_SUPPORTED 1352 PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr, 1353 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1354 #endif 1355 1356 #ifdef PNG_READ_tRNS_SUPPORTED 1357 PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr, 1358 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1359 #endif 1360 1361 #ifdef PNG_READ_zTXt_SUPPORTED 1362 PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr, 1363 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1364 #endif 1365 1366 PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_structrp png_ptr, 1367 png_uint_32 chunk_name),PNG_EMPTY); 1368 1369 PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr, 1370 png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY); 1371 /* This is the function that gets called for unknown chunks. The 'keep' 1372 * argument is either non-zero for a known chunk that has been set to be 1373 * handled as unknown or zero for an unknown chunk. By default the function 1374 * just skips the chunk or errors out if it is critical. 1375 */ 1376 1377 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\ 1378 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 1379 PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling, 1380 (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY); 1381 /* Exactly as the API png_handle_as_unknown() except that the argument is a 1382 * 32-bit chunk name, not a string. 1383 */ 1384 #endif /* READ_UNKNOWN_CHUNKS || HANDLE_AS_UNKNOWN */ 1385 1386 /* Handle the transformations for reading and writing */ 1387 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1388 PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr, 1389 png_row_infop row_info),PNG_EMPTY); 1390 #endif 1391 #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED 1392 PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr, 1393 png_row_infop row_info),PNG_EMPTY); 1394 #endif 1395 1396 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1397 PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr), 1398 PNG_EMPTY); 1399 #endif 1400 1401 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1402 PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr, 1403 png_inforp info_ptr),PNG_EMPTY); 1404 PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr, 1405 png_inforp info_ptr),PNG_EMPTY); 1406 PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY); 1407 PNG_INTERNAL_FUNCTION(void,png_push_crc_skip,(png_structrp png_ptr, 1408 png_uint_32 length),PNG_EMPTY); 1409 PNG_INTERNAL_FUNCTION(void,png_push_crc_finish,(png_structrp png_ptr), 1410 PNG_EMPTY); 1411 PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr), 1412 PNG_EMPTY); 1413 PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr, 1414 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); 1415 PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY); 1416 PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr, 1417 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); 1418 PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr), 1419 PNG_EMPTY); 1420 PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr, 1421 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1422 PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr, 1423 png_inforp info_ptr),PNG_EMPTY); 1424 PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr, 1425 png_inforp info_ptr),PNG_EMPTY); 1426 PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr, 1427 png_bytep row),PNG_EMPTY); 1428 PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr, 1429 png_inforp info_ptr),PNG_EMPTY); 1430 PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr, 1431 png_inforp info_ptr),PNG_EMPTY); 1432 PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr), 1433 PNG_EMPTY); 1434 # ifdef PNG_READ_tEXt_SUPPORTED 1435 PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr, 1436 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1437 PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr, 1438 png_inforp info_ptr),PNG_EMPTY); 1439 # endif 1440 # ifdef PNG_READ_zTXt_SUPPORTED 1441 PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr, 1442 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1443 PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr, 1444 png_inforp info_ptr),PNG_EMPTY); 1445 # endif 1446 # ifdef PNG_READ_iTXt_SUPPORTED 1447 PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr, 1448 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1449 PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr, 1450 png_inforp info_ptr),PNG_EMPTY); 1451 # endif 1452 1453 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 1454 1455 /* Added at libpng version 1.6.0 */ 1456 #ifdef PNG_GAMMA_SUPPORTED 1457 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr, 1458 png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY); 1459 /* Set the colorspace gamma with a value provided by the application or by 1460 * the gAMA chunk on read. The value will override anything set by an ICC 1461 * profile. 1462 */ 1463 1464 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr, 1465 png_inforp info_ptr), PNG_EMPTY); 1466 /* Synchronize the info 'valid' flags with the colorspace */ 1467 1468 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr, 1469 png_inforp info_ptr), PNG_EMPTY); 1470 /* Copy the png_struct colorspace to the info_struct and call the above to 1471 * synchronize the flags. Checks for NULL info_ptr and does nothing. 1472 */ 1473 #endif 1474 1475 /* Added at libpng version 1.4.0 */ 1476 #ifdef PNG_COLORSPACE_SUPPORTED 1477 /* These internal functions are for maintaining the colorspace structure within 1478 * a png_info or png_struct (or, indeed, both). 1479 */ 1480 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities, 1481 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy, 1482 int preferred), PNG_EMPTY); 1483 1484 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints, 1485 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ, 1486 int preferred), PNG_EMPTY); 1487 1488 #ifdef PNG_sRGB_SUPPORTED 1489 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr, 1490 png_colorspacerp colorspace, int intent), PNG_EMPTY); 1491 /* This does set the colorspace gAMA and cHRM values too, but doesn't set the 1492 * flags to write them, if it returns false there was a problem and an error 1493 * message has already been output (but the colorspace may still need to be 1494 * synced to record the invalid flag). 1495 */ 1496 #endif /* sRGB */ 1497 1498 #ifdef PNG_iCCP_SUPPORTED 1499 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr, 1500 png_colorspacerp colorspace, png_const_charp name, 1501 png_uint_32 profile_length, png_const_bytep profile, int color_type), 1502 PNG_EMPTY); 1503 /* The 'name' is used for information only */ 1504 1505 /* Routines for checking parts of an ICC profile. */ 1506 PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr, 1507 png_colorspacerp colorspace, png_const_charp name, 1508 png_uint_32 profile_length), PNG_EMPTY); 1509 PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr, 1510 png_colorspacerp colorspace, png_const_charp name, 1511 png_uint_32 profile_length, 1512 png_const_bytep profile /* first 132 bytes only */, int color_type), 1513 PNG_EMPTY); 1514 PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr, 1515 png_colorspacerp colorspace, png_const_charp name, 1516 png_uint_32 profile_length, 1517 png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY); 1518 #ifdef PNG_sRGB_SUPPORTED 1519 PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,( 1520 png_const_structrp png_ptr, png_colorspacerp colorspace, 1521 png_const_bytep profile, uLong adler), PNG_EMPTY); 1522 /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may 1523 * be zero to indicate that it is not available. It is used, if provided, 1524 * as a fast check on the profile when checking to see if it is sRGB. 1525 */ 1526 #endif 1527 #endif /* iCCP */ 1528 1529 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1530 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients, 1531 (png_structrp png_ptr), PNG_EMPTY); 1532 /* Set the rgb_to_gray coefficients from the colorspace Y values */ 1533 #endif /* READ_RGB_TO_GRAY */ 1534 #endif /* COLORSPACE */ 1535 1536 /* Added at libpng version 1.4.0 */ 1537 PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr, 1538 png_uint_32 width, png_uint_32 height, int bit_depth, 1539 int color_type, int interlace_type, int compression_type, 1540 int filter_type),PNG_EMPTY); 1541 1542 /* Added at libpng version 1.5.10 */ 1543 #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \ 1544 defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED) 1545 PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes, 1546 (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY); 1547 #endif 1548 1549 #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) 1550 PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr, 1551 png_const_charp name),PNG_NORETURN); 1552 #endif 1553 1554 /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite 1555 * the end. Always leaves the buffer nul terminated. Never errors out (and 1556 * there is no error code.) 1557 */ 1558 PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize, 1559 size_t pos, png_const_charp string),PNG_EMPTY); 1560 1561 /* Various internal functions to handle formatted warning messages, currently 1562 * only implemented for warnings. 1563 */ 1564 #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) 1565 /* Utility to dump an unsigned value into a buffer, given a start pointer and 1566 * and end pointer (which should point just *beyond* the end of the buffer!) 1567 * Returns the pointer to the start of the formatted string. This utility only 1568 * does unsigned values. 1569 */ 1570 PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start, 1571 png_charp end, int format, png_alloc_size_t number),PNG_EMPTY); 1572 1573 /* Convenience macro that takes an array: */ 1574 #define PNG_FORMAT_NUMBER(buffer,format,number) \ 1575 png_format_number(buffer, buffer + (sizeof buffer), format, number) 1576 1577 /* Suggested size for a number buffer (enough for 64 bits and a sign!) */ 1578 #define PNG_NUMBER_BUFFER_SIZE 24 1579 1580 /* These are the integer formats currently supported, the name is formed from 1581 * the standard printf(3) format string. 1582 */ 1583 #define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */ 1584 #define PNG_NUMBER_FORMAT_02u 2 1585 #define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */ 1586 #define PNG_NUMBER_FORMAT_02d 2 1587 #define PNG_NUMBER_FORMAT_x 3 1588 #define PNG_NUMBER_FORMAT_02x 4 1589 #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */ 1590 #endif 1591 1592 #ifdef PNG_WARNINGS_SUPPORTED 1593 /* New defines and members adding in libpng-1.5.4 */ 1594 # define PNG_WARNING_PARAMETER_SIZE 32 1595 # define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */ 1596 1597 /* An l-value of this type has to be passed to the APIs below to cache the 1598 * values of the parameters to a formatted warning message. 1599 */ 1600 typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][ 1601 PNG_WARNING_PARAMETER_SIZE]; 1602 1603 PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p, 1604 int number, png_const_charp string),PNG_EMPTY); 1605 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters, 1606 * including the trailing '\0'. 1607 */ 1608 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned, 1609 (png_warning_parameters p, int number, int format, png_alloc_size_t value), 1610 PNG_EMPTY); 1611 /* Use png_alloc_size_t because it is an unsigned type as big as any we 1612 * need to output. Use the following for a signed value. 1613 */ 1614 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed, 1615 (png_warning_parameters p, int number, int format, png_int_32 value), 1616 PNG_EMPTY); 1617 1618 PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr, 1619 png_warning_parameters p, png_const_charp message),PNG_EMPTY); 1620 /* 'message' follows the X/Open approach of using @1, @2 to insert 1621 * parameters previously supplied using the above functions. Errors in 1622 * specifying the parameters will simply result in garbage substitutions. 1623 */ 1624 #endif 1625 1626 #ifdef PNG_BENIGN_ERRORS_SUPPORTED 1627 /* Application errors (new in 1.6); use these functions (declared below) for 1628 * errors in the parameters or order of API function calls on read. The 1629 * 'warning' should be used for an error that can be handled completely; the 1630 * 'error' for one which can be handled safely but which may lose application 1631 * information or settings. 1632 * 1633 * By default these both result in a png_error call prior to release, while in a 1634 * released version the 'warning' is just a warning. However if the application 1635 * explicitly disables benign errors (explicitly permitting the code to lose 1636 * information) they both turn into warnings. 1637 * 1638 * If benign errors aren't supported they end up as the corresponding base call 1639 * (png_warning or png_error.) 1640 */ 1641 PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr, 1642 png_const_charp message),PNG_EMPTY); 1643 /* The application provided invalid parameters to an API function or called 1644 * an API function at the wrong time, libpng can completely recover. 1645 */ 1646 1647 PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr, 1648 png_const_charp message),PNG_EMPTY); 1649 /* As above but libpng will ignore the call, or attempt some other partial 1650 * recovery from the error. 1651 */ 1652 #else 1653 # define png_app_warning(pp,s) png_warning(pp,s) 1654 # define png_app_error(pp,s) png_error(pp,s) 1655 #endif 1656 1657 PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr, 1658 png_const_charp message, int error),PNG_EMPTY); 1659 /* Report a recoverable issue in chunk data. On read this is used to report 1660 * a problem found while reading a particular chunk and the 1661 * png_chunk_benign_error or png_chunk_warning function is used as 1662 * appropriate. On write this is used to report an error that comes from 1663 * data set via an application call to a png_set_ API and png_app_error or 1664 * png_app_warning is used as appropriate. 1665 * 1666 * The 'error' parameter must have one of the following values: 1667 */ 1668 #define PNG_CHUNK_WARNING 0 /* never an error */ 1669 #define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */ 1670 #define PNG_CHUNK_ERROR 2 /* always an error */ 1671 1672 /* ASCII to FP interfaces, currently only implemented if sCAL 1673 * support is required. 1674 */ 1675 #if defined(PNG_sCAL_SUPPORTED) 1676 /* MAX_DIGITS is actually the maximum number of characters in an sCAL 1677 * width or height, derived from the precision (number of significant 1678 * digits - a build time settable option) and assumptions about the 1679 * maximum ridiculous exponent. 1680 */ 1681 #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/) 1682 1683 #ifdef PNG_FLOATING_POINT_SUPPORTED 1684 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr, 1685 png_charp ascii, png_size_t size, double fp, unsigned int precision), 1686 PNG_EMPTY); 1687 #endif /* FLOATING_POINT */ 1688 1689 #ifdef PNG_FIXED_POINT_SUPPORTED 1690 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr, 1691 png_charp ascii, png_size_t size, png_fixed_point fp),PNG_EMPTY); 1692 #endif /* FIXED_POINT */ 1693 #endif /* sCAL */ 1694 1695 #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) 1696 /* An internal API to validate the format of a floating point number. 1697 * The result is the index of the next character. If the number is 1698 * not valid it will be the index of a character in the supposed number. 1699 * 1700 * The format of a number is defined in the PNG extensions specification 1701 * and this API is strictly conformant to that spec, not anyone elses! 1702 * 1703 * The format as a regular expression is: 1704 * 1705 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)? 1706 * 1707 * or: 1708 * 1709 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)? 1710 * 1711 * The complexity is that either integer or fraction must be present and the 1712 * fraction is permitted to have no digits only if the integer is present. 1713 * 1714 * NOTE: The dangling E problem. 1715 * There is a PNG valid floating point number in the following: 1716 * 1717 * PNG floating point numbers are not greedy. 1718 * 1719 * Working this out requires *TWO* character lookahead (because of the 1720 * sign), the parser does not do this - it will fail at the 'r' - this 1721 * doesn't matter for PNG sCAL chunk values, but it requires more care 1722 * if the value were ever to be embedded in something more complex. Use 1723 * ANSI-C strtod if you need the lookahead. 1724 */ 1725 /* State table for the parser. */ 1726 #define PNG_FP_INTEGER 0 /* before or in integer */ 1727 #define PNG_FP_FRACTION 1 /* before or in fraction */ 1728 #define PNG_FP_EXPONENT 2 /* before or in exponent */ 1729 #define PNG_FP_STATE 3 /* mask for the above */ 1730 #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */ 1731 #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */ 1732 #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */ 1733 #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */ 1734 #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */ 1735 1736 /* These three values don't affect the parser. They are set but not used. 1737 */ 1738 #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */ 1739 #define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */ 1740 #define PNG_FP_NONZERO 256 /* A non-zero value */ 1741 #define PNG_FP_STICKY 448 /* The above three flags */ 1742 1743 /* This is available for the caller to store in 'state' if required. Do not 1744 * call the parser after setting it (the parser sometimes clears it.) 1745 */ 1746 #define PNG_FP_INVALID 512 /* Available for callers as a distinct value */ 1747 1748 /* Result codes for the parser (boolean - true meants ok, false means 1749 * not ok yet.) 1750 */ 1751 #define PNG_FP_MAYBE 0 /* The number may be valid in the future */ 1752 #define PNG_FP_OK 1 /* The number is valid */ 1753 1754 /* Tests on the sticky non-zero and negative flags. To pass these checks 1755 * the state must also indicate that the whole number is valid - this is 1756 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this 1757 * is equivalent to PNG_FP_OK above.) 1758 */ 1759 #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO) 1760 /* NZ_MASK: the string is valid and a non-zero negative value */ 1761 #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO) 1762 /* Z MASK: the string is valid and a non-zero value. */ 1763 /* PNG_FP_SAW_DIGIT: the string is valid. */ 1764 #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT) 1765 #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK) 1766 #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK) 1767 1768 /* The actual parser. This can be called repeatedly. It updates 1769 * the index into the string and the state variable (which must 1770 * be initialized to 0). It returns a result code, as above. There 1771 * is no point calling the parser any more if it fails to advance to 1772 * the end of the string - it is stuck on an invalid character (or 1773 * terminated by '\0'). 1774 * 1775 * Note that the pointer will consume an E or even an E+ and then leave 1776 * a 'maybe' state even though a preceding integer.fraction is valid. 1777 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was 1778 * a valid number. It's possible to recover from this by calling 1779 * the parser again (from the start, with state 0) but with a string 1780 * that omits the last character (i.e. set the size to the index of 1781 * the problem character.) This has not been tested within libpng. 1782 */ 1783 PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string, 1784 png_size_t size, int *statep, png_size_tp whereami),PNG_EMPTY); 1785 1786 /* This is the same but it checks a complete string and returns true 1787 * only if it just contains a floating point number. As of 1.5.4 this 1788 * function also returns the state at the end of parsing the number if 1789 * it was valid (otherwise it returns 0.) This can be used for testing 1790 * for negative or zero values using the sticky flag. 1791 */ 1792 PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string, 1793 png_size_t size),PNG_EMPTY); 1794 #endif /* pCAL || sCAL */ 1795 1796 #if defined(PNG_GAMMA_SUPPORTED) ||\ 1797 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED) 1798 /* Added at libpng version 1.5.0 */ 1799 /* This is a utility to provide a*times/div (rounded) and indicate 1800 * if there is an overflow. The result is a boolean - false (0) 1801 * for overflow, true (1) if no overflow, in which case *res 1802 * holds the result. 1803 */ 1804 PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a, 1805 png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY); 1806 #endif 1807 1808 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED) 1809 /* Same deal, but issue a warning on overflow and return 0. */ 1810 PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn, 1811 (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by, 1812 png_int_32 divided_by),PNG_EMPTY); 1813 #endif 1814 1815 #ifdef PNG_GAMMA_SUPPORTED 1816 /* Calculate a reciprocal - used for gamma values. This returns 1817 * 0 if the argument is 0 in order to maintain an undefined value; 1818 * there are no warnings. 1819 */ 1820 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a), 1821 PNG_EMPTY); 1822 1823 #ifdef PNG_READ_GAMMA_SUPPORTED 1824 /* The same but gives a reciprocal of the product of two fixed point 1825 * values. Accuracy is suitable for gamma calculations but this is 1826 * not exact - use png_muldiv for that. Only required at present on read. 1827 */ 1828 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a, 1829 png_fixed_point b),PNG_EMPTY); 1830 #endif 1831 1832 /* Return true if the gamma value is significantly different from 1.0 */ 1833 PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value), 1834 PNG_EMPTY); 1835 #endif 1836 1837 #ifdef PNG_READ_GAMMA_SUPPORTED 1838 /* Internal fixed point gamma correction. These APIs are called as 1839 * required to convert single values - they don't need to be fast, 1840 * they are not used when processing image pixel values. 1841 * 1842 * While the input is an 'unsigned' value it must actually be the 1843 * correct bit value - 0..255 or 0..65535 as required. 1844 */ 1845 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr, 1846 unsigned int value, png_fixed_point gamma_value),PNG_EMPTY); 1847 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value, 1848 png_fixed_point gamma_value),PNG_EMPTY); 1849 PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value, 1850 png_fixed_point gamma_value),PNG_EMPTY); 1851 PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr), 1852 PNG_EMPTY); 1853 PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr, 1854 int bit_depth),PNG_EMPTY); 1855 #endif 1856 1857 /* SIMPLIFIED READ/WRITE SUPPORT */ 1858 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 1859 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 1860 /* The internal structure that png_image::opaque points to. */ 1861 typedef struct png_control 1862 { 1863 png_structp png_ptr; 1864 png_infop info_ptr; 1865 png_voidp error_buf; /* Always a jmp_buf at present. */ 1866 1867 png_const_bytep memory; /* Memory buffer. */ 1868 png_size_t size; /* Size of the memory buffer. */ 1869 1870 unsigned int for_write :1; /* Otherwise it is a read structure */ 1871 unsigned int owned_file :1; /* We own the file in io_ptr */ 1872 } png_control; 1873 1874 /* Return the pointer to the jmp_buf from a png_control: necessary because C 1875 * does not reveal the type of the elements of jmp_buf. 1876 */ 1877 #ifdef __cplusplus 1878 # define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0]) 1879 #else 1880 # define png_control_jmp_buf(pc) ((pc)->error_buf) 1881 #endif 1882 1883 /* Utility to safely execute a piece of libpng code catching and logging any 1884 * errors that might occur. Returns true on success, false on failure (either 1885 * of the function or as a result of a png_error.) 1886 */ 1887 PNG_INTERNAL_CALLBACK(void,png_safe_error,(png_structp png_ptr, 1888 png_const_charp error_message),PNG_NORETURN); 1889 1890 #ifdef PNG_WARNINGS_SUPPORTED 1891 PNG_INTERNAL_CALLBACK(void,png_safe_warning,(png_structp png_ptr, 1892 png_const_charp warning_message),PNG_EMPTY); 1893 #else 1894 # define png_safe_warning 0/*dummy argument*/ 1895 #endif 1896 1897 PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image, 1898 int (*function)(png_voidp), png_voidp arg),PNG_EMPTY); 1899 1900 /* Utility to log an error; this also cleans up the png_image; the function 1901 * always returns 0 (false). 1902 */ 1903 PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image, 1904 png_const_charp error_message),PNG_EMPTY); 1905 1906 #ifndef PNG_SIMPLIFIED_READ_SUPPORTED 1907 /* png_image_free is used by the write code but not exported */ 1908 PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY); 1909 #endif /* !SIMPLIFIED_READ */ 1910 1911 #endif /* SIMPLIFIED READ/WRITE */ 1912 1913 /* These are initialization functions for hardware specific PNG filter 1914 * optimizations; list these here then select the appropriate one at compile 1915 * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined 1916 * the generic code is used. 1917 */ 1918 #ifdef PNG_FILTER_OPTIMIZATIONS 1919 PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr, 1920 unsigned int bpp), PNG_EMPTY); 1921 /* Just declare the optimization that will be used */ 1922 #else 1923 /* List *all* the possible optimizations here - this branch is required if 1924 * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in 1925 * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing. 1926 */ 1927 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon, 1928 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 1929 #endif 1930 1931 /* Maintainer: Put new private prototypes here ^ */ 1932 1933 #include "pngdebug.h" 1934 1935 #ifdef __cplusplus 1936 } 1937 #endif 1938 1939 #endif /* PNG_VERSION_INFO_ONLY */ 1940 #endif /* PNGPRIV_H */ 1941