1 2 /* pngpriv.h - private declarations for use inside libpng 3 * 4 * Copyright (c) 2018-2022 Cosmin Truta 5 * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson 6 * Copyright (c) 1996-1997 Andreas Dilger 7 * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc. 8 * 9 * This code is released under the libpng license. 10 * For conditions of distribution and use, see the disclaimer 11 * and license in png.h 12 */ 13 14 /* The symbols declared in this file (including the functions declared 15 * as extern) are PRIVATE. They are not part of the libpng public 16 * interface, and are not recommended for use by regular applications. 17 * Some of them may become public in the future; others may stay private, 18 * change in an incompatible way, or even disappear. 19 * Although the libpng users are not forbidden to include this header, 20 * they should be well aware of the issues that may arise from doing so. 21 */ 22 23 #ifndef PNGPRIV_H 24 #define PNGPRIV_H 25 26 /* Feature Test Macros. The following are defined here to ensure that correctly 27 * implemented libraries reveal the APIs libpng needs to build and hide those 28 * that are not needed and potentially damaging to the compilation. 29 * 30 * Feature Test Macros must be defined before any system header is included (see 31 * POSIX 1003.1 2.8.2 "POSIX Symbols." 32 * 33 * These macros only have an effect if the operating system supports either 34 * POSIX 1003.1 or C99, or both. On other operating systems (particularly 35 * Windows/Visual Studio) there is no effect; the OS specific tests below are 36 * still required (as of 2011-05-02.) 37 */ 38 #ifndef _POSIX_SOURCE 39 # define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */ 40 #endif 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 * Note that gcc-4.9 defines __ARM_NEON instead of the deprecated 124 * __ARM_NEON__, so we check both variants. 125 * 126 * To disable ARM_NEON optimizations entirely, and skip compiling the 127 * associated assembler code, pass --enable-arm-neon=no to configure 128 * or put -DPNG_ARM_NEON_OPT=0 in CPPFLAGS. 129 */ 130 # if (defined(__ARM_NEON__) || defined(__ARM_NEON)) && \ 131 defined(PNG_ALIGNED_MEMORY_SUPPORTED) 132 # define PNG_ARM_NEON_OPT 2 133 # else 134 # define PNG_ARM_NEON_OPT 0 135 # endif 136 #endif 137 138 #if PNG_ARM_NEON_OPT > 0 139 /* NEON optimizations are to be at least considered by libpng, so enable the 140 * callbacks to do this. 141 */ 142 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_neon 143 144 /* By default the 'intrinsics' code in arm/filter_neon_intrinsics.c is used 145 * if possible - if __ARM_NEON__ is set and the compiler version is not known 146 * to be broken. This is controlled by PNG_ARM_NEON_IMPLEMENTATION which can 147 * be: 148 * 149 * 1 The intrinsics code (the default with __ARM_NEON__) 150 * 2 The hand coded assembler (the default without __ARM_NEON__) 151 * 152 * It is possible to set PNG_ARM_NEON_IMPLEMENTATION in CPPFLAGS, however 153 * this is *NOT* supported and may cease to work even after a minor revision 154 * to libpng. It *is* valid to do this for testing purposes, e.g. speed 155 * testing or a new compiler, but the results should be communicated to the 156 * libpng implementation list for incorporation in the next minor release. 157 */ 158 # ifndef PNG_ARM_NEON_IMPLEMENTATION 159 # if defined(__ARM_NEON__) || defined(__ARM_NEON) 160 # if defined(__clang__) 161 /* At present it is unknown by the libpng developers which versions 162 * of clang support the intrinsics, however some or perhaps all 163 * versions do not work with the assembler so this may be 164 * irrelevant, so just use the default (do nothing here.) 165 */ 166 # elif defined(__GNUC__) 167 /* GCC 4.5.4 NEON support is known to be broken. 4.6.3 is known to 168 * work, so if this *is* GCC, or G++, look for a version >4.5 169 */ 170 # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6) 171 # define PNG_ARM_NEON_IMPLEMENTATION 2 172 # endif /* no GNUC support */ 173 # endif /* __GNUC__ */ 174 # else /* !defined __ARM_NEON__ */ 175 /* The 'intrinsics' code simply won't compile without this -mfpu=neon: 176 */ 177 # if !defined(__aarch64__) && !defined(_M_ARM64) 178 /* The assembler code currently does not work on ARM64 */ 179 # define PNG_ARM_NEON_IMPLEMENTATION 2 180 # endif /* __aarch64__ */ 181 # endif /* __ARM_NEON__ */ 182 # endif /* !PNG_ARM_NEON_IMPLEMENTATION */ 183 184 # ifndef PNG_ARM_NEON_IMPLEMENTATION 185 /* Use the intrinsics code by default. */ 186 # define PNG_ARM_NEON_IMPLEMENTATION 1 187 # endif 188 #else /* PNG_ARM_NEON_OPT == 0 */ 189 # define PNG_ARM_NEON_IMPLEMENTATION 0 190 #endif /* PNG_ARM_NEON_OPT > 0 */ 191 192 #ifndef PNG_MIPS_MSA_OPT 193 # if defined(__mips_msa) && (__mips_isa_rev >= 5) && defined(PNG_ALIGNED_MEMORY_SUPPORTED) 194 # define PNG_MIPS_MSA_OPT 2 195 # else 196 # define PNG_MIPS_MSA_OPT 0 197 # endif 198 #endif 199 200 #ifndef PNG_POWERPC_VSX_OPT 201 # if defined(__PPC64__) && defined(__ALTIVEC__) && defined(__VSX__) 202 # define PNG_POWERPC_VSX_OPT 2 203 # else 204 # define PNG_POWERPC_VSX_OPT 0 205 # endif 206 #endif 207 208 #ifndef PNG_INTEL_SSE_OPT 209 # ifdef PNG_INTEL_SSE 210 /* Only check for SSE if the build configuration has been modified to 211 * enable SSE optimizations. This means that these optimizations will 212 * be off by default. See contrib/intel for more details. 213 */ 214 # if defined(__SSE4_1__) || defined(__AVX__) || defined(__SSSE3__) || \ 215 defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \ 216 (defined(_M_IX86_FP) && _M_IX86_FP >= 2) 217 # define PNG_INTEL_SSE_OPT 1 218 # else 219 # define PNG_INTEL_SSE_OPT 0 220 # endif 221 # else 222 # define PNG_INTEL_SSE_OPT 0 223 # endif 224 #endif 225 226 #if PNG_INTEL_SSE_OPT > 0 227 # ifndef PNG_INTEL_SSE_IMPLEMENTATION 228 # if defined(__SSE4_1__) || defined(__AVX__) 229 /* We are not actually using AVX, but checking for AVX is the best 230 way we can detect SSE4.1 and SSSE3 on MSVC. 231 */ 232 # define PNG_INTEL_SSE_IMPLEMENTATION 3 233 # elif defined(__SSSE3__) 234 # define PNG_INTEL_SSE_IMPLEMENTATION 2 235 # elif defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \ 236 (defined(_M_IX86_FP) && _M_IX86_FP >= 2) 237 # define PNG_INTEL_SSE_IMPLEMENTATION 1 238 # else 239 # define PNG_INTEL_SSE_IMPLEMENTATION 0 240 # endif 241 # endif 242 243 # if PNG_INTEL_SSE_IMPLEMENTATION > 0 244 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_sse2 245 # endif 246 #else 247 # define PNG_INTEL_SSE_IMPLEMENTATION 0 248 #endif 249 250 #if PNG_MIPS_MSA_OPT > 0 251 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_msa 252 # ifndef PNG_MIPS_MSA_IMPLEMENTATION 253 # if defined(__mips_msa) 254 # if defined(__clang__) 255 # elif defined(__GNUC__) 256 # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7) 257 # define PNG_MIPS_MSA_IMPLEMENTATION 2 258 # endif /* no GNUC support */ 259 # endif /* __GNUC__ */ 260 # else /* !defined __mips_msa */ 261 # define PNG_MIPS_MSA_IMPLEMENTATION 2 262 # endif /* __mips_msa */ 263 # endif /* !PNG_MIPS_MSA_IMPLEMENTATION */ 264 265 # ifndef PNG_MIPS_MSA_IMPLEMENTATION 266 # define PNG_MIPS_MSA_IMPLEMENTATION 1 267 # endif 268 #else 269 # define PNG_MIPS_MSA_IMPLEMENTATION 0 270 #endif /* PNG_MIPS_MSA_OPT > 0 */ 271 272 #if PNG_POWERPC_VSX_OPT > 0 273 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_vsx 274 # define PNG_POWERPC_VSX_IMPLEMENTATION 1 275 #else 276 # define PNG_POWERPC_VSX_IMPLEMENTATION 0 277 #endif 278 279 280 /* Is this a build of a DLL where compilation of the object modules requires 281 * different preprocessor settings to those required for a simple library? If 282 * so PNG_BUILD_DLL must be set. 283 * 284 * If libpng is used inside a DLL but that DLL does not export the libpng APIs 285 * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a 286 * static library of libpng then link the DLL against that. 287 */ 288 #ifndef PNG_BUILD_DLL 289 # ifdef DLL_EXPORT 290 /* This is set by libtool when files are compiled for a DLL; libtool 291 * always compiles twice, even on systems where it isn't necessary. Set 292 * PNG_BUILD_DLL in case it is necessary: 293 */ 294 # define PNG_BUILD_DLL 295 # else 296 # ifdef _WINDLL 297 /* This is set by the Microsoft Visual Studio IDE in projects that 298 * build a DLL. It can't easily be removed from those projects (it 299 * isn't visible in the Visual Studio UI) so it is a fairly reliable 300 * indication that PNG_IMPEXP needs to be set to the DLL export 301 * attributes. 302 */ 303 # define PNG_BUILD_DLL 304 # else 305 # ifdef __DLL__ 306 /* This is set by the Borland C system when compiling for a DLL 307 * (as above.) 308 */ 309 # define PNG_BUILD_DLL 310 # else 311 /* Add additional compiler cases here. */ 312 # endif 313 # endif 314 # endif 315 #endif /* Setting PNG_BUILD_DLL if required */ 316 317 /* See pngconf.h for more details: the builder of the library may set this on 318 * the command line to the right thing for the specific compilation system or it 319 * may be automagically set above (at present we know of no system where it does 320 * need to be set on the command line.) 321 * 322 * PNG_IMPEXP must be set here when building the library to prevent pngconf.h 323 * setting it to the "import" setting for a DLL build. 324 */ 325 #ifndef PNG_IMPEXP 326 # ifdef PNG_BUILD_DLL 327 # define PNG_IMPEXP PNG_DLL_EXPORT 328 # else 329 /* Not building a DLL, or the DLL doesn't require specific export 330 * definitions. 331 */ 332 # define PNG_IMPEXP 333 # endif 334 #endif 335 336 /* No warnings for private or deprecated functions in the build: */ 337 #ifndef PNG_DEPRECATED 338 # define PNG_DEPRECATED 339 #endif 340 #ifndef PNG_PRIVATE 341 # define PNG_PRIVATE 342 #endif 343 344 /* Symbol preprocessing support. 345 * 346 * To enable listing global, but internal, symbols the following macros should 347 * always be used to declare an extern data or function object in this file. 348 */ 349 #ifndef PNG_INTERNAL_DATA 350 # define PNG_INTERNAL_DATA(type, name, array) PNG_LINKAGE_DATA type name array 351 #endif 352 353 #ifndef PNG_INTERNAL_FUNCTION 354 # define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\ 355 PNG_LINKAGE_FUNCTION PNG_FUNCTION(type, name, args, PNG_EMPTY attributes) 356 #endif 357 358 #ifndef PNG_INTERNAL_CALLBACK 359 # define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\ 360 PNG_LINKAGE_CALLBACK PNG_FUNCTION(type, (PNGCBAPI name), args,\ 361 PNG_EMPTY attributes) 362 #endif 363 364 /* If floating or fixed point APIs are disabled they may still be compiled 365 * internally. To handle this make sure they are declared as the appropriate 366 * internal extern function (otherwise the symbol prefixing stuff won't work and 367 * the functions will be used without definitions.) 368 * 369 * NOTE: although all the API functions are declared here they are not all 370 * actually built! Because the declarations are still made it is necessary to 371 * fake out types that they depend on. 372 */ 373 #ifndef PNG_FP_EXPORT 374 # ifndef PNG_FLOATING_POINT_SUPPORTED 375 # define PNG_FP_EXPORT(ordinal, type, name, args)\ 376 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 377 # ifndef PNG_VERSION_INFO_ONLY 378 typedef struct png_incomplete png_double; 379 typedef png_double* png_doublep; 380 typedef const png_double* png_const_doublep; 381 typedef png_double** png_doublepp; 382 # endif 383 # endif 384 #endif 385 #ifndef PNG_FIXED_EXPORT 386 # ifndef PNG_FIXED_POINT_SUPPORTED 387 # define PNG_FIXED_EXPORT(ordinal, type, name, args)\ 388 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 389 # endif 390 #endif 391 392 #include "png.h" 393 394 /* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */ 395 #ifndef PNG_DLL_EXPORT 396 # define PNG_DLL_EXPORT 397 #endif 398 399 /* This is a global switch to set the compilation for an installed system 400 * (a release build). It can be set for testing debug builds to ensure that 401 * they will compile when the build type is switched to RC or STABLE, the 402 * default is just to use PNG_LIBPNG_BUILD_BASE_TYPE. Set this in CPPFLAGS 403 * with either: 404 * 405 * -DPNG_RELEASE_BUILD Turns on the release compile path 406 * -DPNG_RELEASE_BUILD=0 Turns it off 407 * or in your pngusr.h with 408 * #define PNG_RELEASE_BUILD=1 Turns on the release compile path 409 * #define PNG_RELEASE_BUILD=0 Turns it off 410 */ 411 #ifndef PNG_RELEASE_BUILD 412 # define PNG_RELEASE_BUILD (PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC) 413 #endif 414 415 /* SECURITY and SAFETY: 416 * 417 * libpng is built with support for internal limits on image dimensions and 418 * memory usage. These are documented in scripts/pnglibconf.dfa of the 419 * source and recorded in the machine generated header file pnglibconf.h. 420 */ 421 422 /* If you are running on a machine where you cannot allocate more 423 * than 64K of memory at once, uncomment this. While libpng will not 424 * normally need that much memory in a chunk (unless you load up a very 425 * large file), zlib needs to know how big of a chunk it can use, and 426 * libpng thus makes sure to check any memory allocation to verify it 427 * will fit into memory. 428 * 429 * zlib provides 'MAXSEG_64K' which, if defined, indicates the 430 * same limit and pngconf.h (already included) sets the limit 431 * if certain operating systems are detected. 432 */ 433 #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K) 434 # define PNG_MAX_MALLOC_64K 435 #endif 436 437 #ifndef PNG_UNUSED 438 /* Unused formal parameter warnings are silenced using the following macro 439 * which is expected to have no bad effects on performance (optimizing 440 * compilers will probably remove it entirely). Note that if you replace 441 * it with something other than whitespace, you must include the terminating 442 * semicolon. 443 */ 444 # define PNG_UNUSED(param) (void)param; 445 #endif 446 447 /* Just a little check that someone hasn't tried to define something 448 * contradictory. 449 */ 450 #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K) 451 # undef PNG_ZBUF_SIZE 452 # define PNG_ZBUF_SIZE 65536L 453 #endif 454 455 /* If warnings or errors are turned off the code is disabled or redirected here. 456 * From 1.5.4 functions have been added to allow very limited formatting of 457 * error and warning messages - this code will also be disabled here. 458 */ 459 #ifdef PNG_WARNINGS_SUPPORTED 460 # define PNG_WARNING_PARAMETERS(p) png_warning_parameters p; 461 #else 462 # define png_warning_parameter(p,number,string) ((void)0) 463 # define png_warning_parameter_unsigned(p,number,format,value) ((void)0) 464 # define png_warning_parameter_signed(p,number,format,value) ((void)0) 465 # define png_formatted_warning(pp,p,message) ((void)(pp)) 466 # define PNG_WARNING_PARAMETERS(p) 467 #endif 468 #ifndef PNG_ERROR_TEXT_SUPPORTED 469 # define png_fixed_error(s1,s2) png_err(s1) 470 #endif 471 472 /* Some fixed point APIs are still required even if not exported because 473 * they get used by the corresponding floating point APIs. This magic 474 * deals with this: 475 */ 476 #ifdef PNG_FIXED_POINT_SUPPORTED 477 # define PNGFAPI PNGAPI 478 #else 479 # define PNGFAPI /* PRIVATE */ 480 #endif 481 482 #ifndef PNG_VERSION_INFO_ONLY 483 /* Other defines specific to compilers can go here. Try to keep 484 * them inside an appropriate ifdef/endif pair for portability. 485 */ 486 487 /* C allows up-casts from (void*) to any pointer and (const void*) to any 488 * pointer to a const object. C++ regards this as a type error and requires an 489 * explicit, static, cast and provides the static_cast<> rune to ensure that 490 * const is not cast away. 491 */ 492 #ifdef __cplusplus 493 # define png_voidcast(type, value) static_cast<type>(value) 494 # define png_constcast(type, value) const_cast<type>(value) 495 # define png_aligncast(type, value) \ 496 static_cast<type>(static_cast<void*>(value)) 497 # define png_aligncastconst(type, value) \ 498 static_cast<type>(static_cast<const void*>(value)) 499 #else 500 # define png_voidcast(type, value) (value) 501 # define png_constcast(type, value) ((type)(void*)(const void*)(value)) 502 # define png_aligncast(type, value) ((void*)(value)) 503 # define png_aligncastconst(type, value) ((const void*)(value)) 504 #endif /* __cplusplus */ 505 506 #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\ 507 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) 508 /* png.c requires the following ANSI-C constants if the conversion of 509 * floating point to ASCII is implemented therein: 510 * 511 * DBL_DIG Maximum number of decimal digits (can be set to any constant) 512 * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value) 513 * DBL_MAX Maximum floating point number (can be set to an arbitrary value) 514 */ 515 # include <float.h> 516 517 # if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \ 518 defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC) 519 /* We need to check that <math.h> hasn't already been included earlier 520 * as it seems it doesn't agree with <fp.h>, yet we should really use 521 * <fp.h> if possible. 522 */ 523 # if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__) 524 # include <fp.h> 525 # endif 526 # else 527 # include <math.h> 528 # endif 529 # if defined(_AMIGA) && defined(__SASC) && defined(_M68881) 530 /* Amiga SAS/C: We must include builtin FPU functions when compiling using 531 * MATH=68881 532 */ 533 # include <m68881.h> 534 # endif 535 #endif 536 537 /* This provides the non-ANSI (far) memory allocation routines. */ 538 #if defined(__TURBOC__) && defined(__MSDOS__) 539 # include <mem.h> 540 # include <alloc.h> 541 #endif 542 543 #if defined(_WIN32) || defined(__WIN32__) || defined(__NT__) 544 # include <windows.h> 545 #endif 546 #endif /* PNG_VERSION_INFO_ONLY */ 547 548 /* Moved here around 1.5.0beta36 from pngconf.h */ 549 /* Users may want to use these so they are not private. Any library 550 * functions that are passed far data must be model-independent. 551 */ 552 553 /* Platform-independent functions */ 554 #ifndef PNG_ABORT 555 # define PNG_ABORT() abort() 556 #endif 557 558 /* These macros may need to be architecture dependent. */ 559 #define PNG_ALIGN_NONE 0 /* do not use data alignment */ 560 #define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */ 561 #ifdef offsetof 562 # define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */ 563 #else 564 # define PNG_ALIGN_OFFSET -1 /* prevent the use of this */ 565 #endif 566 #define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */ 567 568 #ifndef PNG_ALIGN_TYPE 569 /* Default to using aligned access optimizations and requiring alignment to a 570 * multiple of the data type size. Override in a compiler specific fashion 571 * if necessary by inserting tests here: 572 */ 573 # define PNG_ALIGN_TYPE PNG_ALIGN_SIZE 574 #endif 575 576 #if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE 577 /* This is used because in some compiler implementations non-aligned 578 * structure members are supported, so the offsetof approach below fails. 579 * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access 580 * is good for performance. Do not do this unless you have tested the 581 * result and understand it. 582 */ 583 # define png_alignof(type) (sizeof(type)) 584 #else 585 # if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET 586 # define png_alignof(type) offsetof(struct{char c; type t;}, t) 587 # else 588 # if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS 589 # define png_alignof(type) 1 590 # endif 591 /* Else leave png_alignof undefined to prevent use thereof */ 592 # endif 593 #endif 594 595 /* This implicitly assumes alignment is always a multiple of 2. */ 596 #ifdef png_alignof 597 # define png_isaligned(ptr, type) \ 598 (((type)(size_t)((const void*)(ptr)) & (type)(png_alignof(type)-1)) == 0) 599 #else 600 # define png_isaligned(ptr, type) 0 601 #endif 602 603 /* End of memory model/platform independent support */ 604 /* End of 1.5.0beta36 move from pngconf.h */ 605 606 /* CONSTANTS and UTILITY MACROS 607 * These are used internally by libpng and not exposed in the API 608 */ 609 610 /* Various modes of operation. Note that after an init, mode is set to 611 * zero automatically when the structure is created. Three of these 612 * are defined in png.h because they need to be visible to applications 613 * that call png_set_unknown_chunk(). 614 */ 615 /* #define PNG_HAVE_IHDR 0x01U (defined in png.h) */ 616 /* #define PNG_HAVE_PLTE 0x02U (defined in png.h) */ 617 #define PNG_HAVE_IDAT 0x04U 618 /* #define PNG_AFTER_IDAT 0x08U (defined in png.h) */ 619 #define PNG_HAVE_IEND 0x10U 620 /* 0x20U (unused) */ 621 /* 0x40U (unused) */ 622 /* 0x80U (unused) */ 623 #define PNG_HAVE_CHUNK_HEADER 0x100U 624 #define PNG_WROTE_tIME 0x200U 625 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400U 626 #define PNG_BACKGROUND_IS_GRAY 0x800U 627 #define PNG_HAVE_PNG_SIGNATURE 0x1000U 628 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000U /* Have another chunk after IDAT */ 629 /* 0x4000U (unused) */ 630 #define PNG_IS_READ_STRUCT 0x8000U /* Else is a write struct */ 631 632 /* Flags for the transformations the PNG library does on the image data */ 633 #define PNG_BGR 0x0001U 634 #define PNG_INTERLACE 0x0002U 635 #define PNG_PACK 0x0004U 636 #define PNG_SHIFT 0x0008U 637 #define PNG_SWAP_BYTES 0x0010U 638 #define PNG_INVERT_MONO 0x0020U 639 #define PNG_QUANTIZE 0x0040U 640 #define PNG_COMPOSE 0x0080U /* Was PNG_BACKGROUND */ 641 #define PNG_BACKGROUND_EXPAND 0x0100U 642 #define PNG_EXPAND_16 0x0200U /* Added to libpng 1.5.2 */ 643 #define PNG_16_TO_8 0x0400U /* Becomes 'chop' in 1.5.4 */ 644 #define PNG_RGBA 0x0800U 645 #define PNG_EXPAND 0x1000U 646 #define PNG_GAMMA 0x2000U 647 #define PNG_GRAY_TO_RGB 0x4000U 648 #define PNG_FILLER 0x8000U 649 #define PNG_PACKSWAP 0x10000U 650 #define PNG_SWAP_ALPHA 0x20000U 651 #define PNG_STRIP_ALPHA 0x40000U 652 #define PNG_INVERT_ALPHA 0x80000U 653 #define PNG_USER_TRANSFORM 0x100000U 654 #define PNG_RGB_TO_GRAY_ERR 0x200000U 655 #define PNG_RGB_TO_GRAY_WARN 0x400000U 656 #define PNG_RGB_TO_GRAY 0x600000U /* two bits, RGB_TO_GRAY_ERR|WARN */ 657 #define PNG_ENCODE_ALPHA 0x800000U /* Added to libpng-1.5.4 */ 658 #define PNG_ADD_ALPHA 0x1000000U /* Added to libpng-1.2.7 */ 659 #define PNG_EXPAND_tRNS 0x2000000U /* Added to libpng-1.2.9 */ 660 #define PNG_SCALE_16_TO_8 0x4000000U /* Added to libpng-1.5.4 */ 661 /* 0x8000000U unused */ 662 /* 0x10000000U unused */ 663 /* 0x20000000U unused */ 664 /* 0x40000000U unused */ 665 /* Flags for png_create_struct */ 666 #define PNG_STRUCT_PNG 0x0001U 667 #define PNG_STRUCT_INFO 0x0002U 668 669 /* Flags for the png_ptr->flags rather than declaring a byte for each one */ 670 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001U 671 #define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002U /* Added to libpng-1.6.0 */ 672 /* 0x0004U unused */ 673 #define PNG_FLAG_ZSTREAM_ENDED 0x0008U /* Added to libpng-1.6.0 */ 674 /* 0x0010U unused */ 675 /* 0x0020U unused */ 676 #define PNG_FLAG_ROW_INIT 0x0040U 677 #define PNG_FLAG_FILLER_AFTER 0x0080U 678 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100U 679 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200U 680 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400U 681 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800U 682 #define PNG_FLAG_ASSUME_sRGB 0x1000U /* Added to libpng-1.5.4 */ 683 #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000U /* Added to libpng-1.5.4 */ 684 #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000U /* Added to libpng-1.5.4 */ 685 /* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000U */ 686 /* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000U */ 687 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000U 688 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000U 689 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000U 690 #define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000U /* Added to libpng-1.4.0 */ 691 #define PNG_FLAG_APP_WARNINGS_WARN 0x200000U /* Added to libpng-1.6.0 */ 692 #define PNG_FLAG_APP_ERRORS_WARN 0x400000U /* Added to libpng-1.6.0 */ 693 /* 0x800000U unused */ 694 /* 0x1000000U unused */ 695 /* 0x2000000U unused */ 696 /* 0x4000000U unused */ 697 /* 0x8000000U unused */ 698 /* 0x10000000U unused */ 699 /* 0x20000000U unused */ 700 /* 0x40000000U unused */ 701 702 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 703 PNG_FLAG_CRC_ANCILLARY_NOWARN) 704 705 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 706 PNG_FLAG_CRC_CRITICAL_IGNORE) 707 708 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 709 PNG_FLAG_CRC_CRITICAL_MASK) 710 711 /* Save typing and make code easier to understand */ 712 713 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 714 abs((int)((c1).green) - (int)((c2).green)) + \ 715 abs((int)((c1).blue) - (int)((c2).blue))) 716 717 /* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255 718 * by dividing by 257 *with rounding*. This macro is exact for the given range. 719 * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the 720 * macro were established by experiment (modifying the added value). The macro 721 * has a second variant that takes a value already scaled by 255 and divides by 722 * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it 723 * only gives off-by-one errors and only for 0.5% (1 in 200) of the values. 724 */ 725 #define PNG_DIV65535(v24) (((v24) + 32895) >> 16) 726 #define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255) 727 728 /* Added to libpng-1.2.6 JB */ 729 #define PNG_ROWBYTES(pixel_bits, width) \ 730 ((pixel_bits) >= 8 ? \ 731 ((size_t)(width) * (((size_t)(pixel_bits)) >> 3)) : \ 732 (( ((size_t)(width) * ((size_t)(pixel_bits))) + 7) >> 3) ) 733 734 /* This returns the number of trailing bits in the last byte of a row, 0 if the 735 * last byte is completely full of pixels. It is, in principle, (pixel_bits x 736 * width) % 8, but that would overflow for large 'width'. The second macro is 737 * the same except that it returns the number of unused bits in the last byte; 738 * (8-TRAILBITS), but 0 when TRAILBITS is 0. 739 * 740 * NOTE: these macros are intended to be self-evidently correct and never 741 * overflow on the assumption that pixel_bits is in the range 0..255. The 742 * arguments are evaluated only once and they can be signed (e.g. as a result of 743 * the integral promotions). The result of the expression always has type 744 * (png_uint_32), however the compiler always knows it is in the range 0..7. 745 */ 746 #define PNG_TRAILBITS(pixel_bits, width) \ 747 (((pixel_bits) * ((width) % (png_uint_32)8)) % 8) 748 749 #define PNG_PADBITS(pixel_bits, width) \ 750 ((8 - PNG_TRAILBITS(pixel_bits, width)) % 8) 751 752 /* PNG_OUT_OF_RANGE returns true if value is outside the range 753 * ideal-delta..ideal+delta. Each argument is evaluated twice. 754 * "ideal" and "delta" should be constants, normally simple 755 * integers, "value" a variable. Added to libpng-1.2.6 JB 756 */ 757 #define PNG_OUT_OF_RANGE(value, ideal, delta) \ 758 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 759 760 /* Conversions between fixed and floating point, only defined if 761 * required (to make sure the code doesn't accidentally use float 762 * when it is supposedly disabled.) 763 */ 764 #ifdef PNG_FLOATING_POINT_SUPPORTED 765 /* The floating point conversion can't overflow, though it can and 766 * does lose accuracy relative to the original fixed point value. 767 * In practice this doesn't matter because png_fixed_point only 768 * stores numbers with very low precision. The png_ptr and s 769 * arguments are unused by default but are there in case error 770 * checking becomes a requirement. 771 */ 772 #define png_float(png_ptr, fixed, s) (.00001 * (fixed)) 773 774 /* The fixed point conversion performs range checking and evaluates 775 * its argument multiple times, so must be used with care. The 776 * range checking uses the PNG specification values for a signed 777 * 32-bit fixed point value except that the values are deliberately 778 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly 779 * (2^31-1) * 100000). 's' is a string that describes the value being 780 * converted. 781 * 782 * NOTE: this macro will raise a png_error if the range check fails, 783 * therefore it is normally only appropriate to use this on values 784 * that come from API calls or other sources where an out of range 785 * error indicates a programming error, not a data error! 786 * 787 * NOTE: by default this is off - the macro is not used - because the 788 * function call saves a lot of code. 789 */ 790 #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED 791 #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\ 792 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0)) 793 #endif 794 /* else the corresponding function is defined below, inside the scope of the 795 * cplusplus test. 796 */ 797 #endif 798 799 /* Constants for known chunk types. If you need to add a chunk, define the name 800 * here. For historical reasons these constants have the form png_<name>; i.e. 801 * the prefix is lower case. Please use decimal values as the parameters to 802 * match the ISO PNG specification and to avoid relying on the C locale 803 * interpretation of character values. 804 * 805 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values 806 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string 807 * to be generated if required. 808 * 809 * PNG_32b correctly produces a value shifted by up to 24 bits, even on 810 * architectures where (int) is only 16 bits. 811 */ 812 #define PNG_32b(b,s) ((png_uint_32)(b) << (s)) 813 #define PNG_U32(b1,b2,b3,b4) \ 814 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0)) 815 816 /* Constants for known chunk types. 817 * 818 * MAINTAINERS: If you need to add a chunk, define the name here. 819 * For historical reasons these constants have the form png_<name>; i.e. 820 * the prefix is lower case. Please use decimal values as the parameters to 821 * match the ISO PNG specification and to avoid relying on the C locale 822 * interpretation of character values. Please keep the list sorted. 823 * 824 * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk 825 * type. In fact the specification does not express chunk types this way, 826 * however using a 32-bit value means that the chunk type can be read from the 827 * stream using exactly the same code as used for a 32-bit unsigned value and 828 * can be examined far more efficiently (using one arithmetic compare). 829 * 830 * Prior to 1.5.6 the chunk type constants were expressed as C strings. The 831 * libpng API still uses strings for 'unknown' chunks and a macro, 832 * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice 833 * that for portable code numeric values must still be used; the string "IHDR" 834 * is not portable and neither is PNG_U32('I', 'H', 'D', 'R'). 835 * 836 * In 1.7.0 the definitions will be made public in png.h to avoid having to 837 * duplicate the same definitions in application code. 838 */ 839 #define png_IDAT PNG_U32( 73, 68, 65, 84) 840 #define png_IEND PNG_U32( 73, 69, 78, 68) 841 #define png_IHDR PNG_U32( 73, 72, 68, 82) 842 #define png_PLTE PNG_U32( 80, 76, 84, 69) 843 #define png_bKGD PNG_U32( 98, 75, 71, 68) 844 #define png_cHRM PNG_U32( 99, 72, 82, 77) 845 #define png_eXIf PNG_U32(101, 88, 73, 102) /* registered July 2017 */ 846 #define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */ 847 #define png_gAMA PNG_U32(103, 65, 77, 65) 848 #define png_gIFg PNG_U32(103, 73, 70, 103) 849 #define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */ 850 #define png_gIFx PNG_U32(103, 73, 70, 120) 851 #define png_hIST PNG_U32(104, 73, 83, 84) 852 #define png_iCCP PNG_U32(105, 67, 67, 80) 853 #define png_iTXt PNG_U32(105, 84, 88, 116) 854 #define png_oFFs PNG_U32(111, 70, 70, 115) 855 #define png_pCAL PNG_U32(112, 67, 65, 76) 856 #define png_pHYs PNG_U32(112, 72, 89, 115) 857 #define png_sBIT PNG_U32(115, 66, 73, 84) 858 #define png_sCAL PNG_U32(115, 67, 65, 76) 859 #define png_sPLT PNG_U32(115, 80, 76, 84) 860 #define png_sRGB PNG_U32(115, 82, 71, 66) 861 #define png_sTER PNG_U32(115, 84, 69, 82) 862 #define png_tEXt PNG_U32(116, 69, 88, 116) 863 #define png_tIME PNG_U32(116, 73, 77, 69) 864 #define png_tRNS PNG_U32(116, 82, 78, 83) 865 #define png_zTXt PNG_U32(122, 84, 88, 116) 866 867 /* The following will work on (signed char*) strings, whereas the get_uint_32 868 * macro will fail on top-bit-set values because of the sign extension. 869 */ 870 #define PNG_CHUNK_FROM_STRING(s)\ 871 PNG_U32(0xff & (s)[0], 0xff & (s)[1], 0xff & (s)[2], 0xff & (s)[3]) 872 873 /* This uses (char), not (png_byte) to avoid warnings on systems where (char) is 874 * signed and the argument is a (char[]) This macro will fail miserably on 875 * systems where (char) is more than 8 bits. 876 */ 877 #define PNG_STRING_FROM_CHUNK(s,c)\ 878 (void)(((char*)(s))[0]=(char)(((c)>>24) & 0xff), \ 879 ((char*)(s))[1]=(char)(((c)>>16) & 0xff),\ 880 ((char*)(s))[2]=(char)(((c)>>8) & 0xff), \ 881 ((char*)(s))[3]=(char)((c & 0xff))) 882 883 /* Do the same but terminate with a null character. */ 884 #define PNG_CSTRING_FROM_CHUNK(s,c)\ 885 (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0) 886 887 /* Test on flag values as defined in the spec (section 5.4): */ 888 #define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29)) 889 #define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c)) 890 #define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21)) 891 #define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13)) 892 #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5)) 893 894 /* Gamma values (new at libpng-1.5.4): */ 895 #define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */ 896 #define PNG_GAMMA_MAC_INVERSE 65909 897 #define PNG_GAMMA_sRGB_INVERSE 45455 898 899 /* Almost everything below is C specific; the #defines above can be used in 900 * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot. 901 */ 902 #ifndef PNG_VERSION_INFO_ONLY 903 904 #include "pngstruct.h" 905 #include "pnginfo.h" 906 907 /* Validate the include paths - the include path used to generate pnglibconf.h 908 * must match that used in the build, or we must be using pnglibconf.h.prebuilt: 909 */ 910 #if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM 911 # error ZLIB_VERNUM != PNG_ZLIB_VERNUM \ 912 "-I (include path) error: see the notes in pngpriv.h" 913 /* This means that when pnglibconf.h was built the copy of zlib.h that it 914 * used is not the same as the one being used here. Because the build of 915 * libpng makes decisions to use inflateInit2 and inflateReset2 based on the 916 * zlib version number and because this affects handling of certain broken 917 * PNG files the -I directives must match. 918 * 919 * The most likely explanation is that you passed a -I in CFLAGS. This will 920 * not work; all the preprocessor directives and in particular all the -I 921 * directives must be in CPPFLAGS. 922 */ 923 #endif 924 925 /* This is used for 16-bit gamma tables -- only the top level pointers are 926 * const; this could be changed: 927 */ 928 typedef const png_uint_16p * png_const_uint_16pp; 929 930 /* Added to libpng-1.5.7: sRGB conversion tables */ 931 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 932 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 933 #ifdef PNG_SIMPLIFIED_READ_SUPPORTED 934 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]); 935 /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value, 936 * 0..65535. This table gives the closest 16-bit answers (no errors). 937 */ 938 #endif 939 940 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]); 941 PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]); 942 943 #define PNG_sRGB_FROM_LINEAR(linear) \ 944 ((png_byte)(0xff & ((png_sRGB_base[(linear)>>15] \ 945 + ((((linear) & 0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8))) 946 /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB 947 * encoded value with maximum error 0.646365. Note that the input is not a 948 * 16-bit value; it has been multiplied by 255! */ 949 #endif /* SIMPLIFIED_READ/WRITE */ 950 951 952 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 953 #ifdef __cplusplus 954 extern "C" { 955 #endif /* __cplusplus */ 956 957 /* Internal functions; these are not exported from a DLL however because they 958 * are used within several of the C source files they have to be C extern. 959 * 960 * All of these functions must be declared with PNG_INTERNAL_FUNCTION. 961 */ 962 963 /* Zlib support */ 964 #define PNG_UNEXPECTED_ZLIB_RETURN (-7) 965 PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret), 966 PNG_EMPTY); 967 /* Used by the zlib handling functions to ensure that z_stream::msg is always 968 * set before they return. 969 */ 970 971 #ifdef PNG_WRITE_SUPPORTED 972 PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr, 973 png_compression_bufferp *list),PNG_EMPTY); 974 /* Free the buffer list used by the compressed write code. */ 975 #endif 976 977 #if defined(PNG_FLOATING_POINT_SUPPORTED) && \ 978 !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \ 979 (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \ 980 defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \ 981 defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \ 982 (defined(PNG_sCAL_SUPPORTED) && \ 983 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)) 984 PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr, 985 double fp, png_const_charp text),PNG_EMPTY); 986 #endif 987 988 /* Check the user version string for compatibility, returns false if the version 989 * numbers aren't compatible. 990 */ 991 PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr, 992 png_const_charp user_png_ver),PNG_EMPTY); 993 994 /* Internal base allocator - no messages, NULL on failure to allocate. This 995 * does, however, call the application provided allocator and that could call 996 * png_error (although that would be a bug in the application implementation.) 997 */ 998 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr, 999 png_alloc_size_t size),PNG_ALLOCATED); 1000 1001 #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\ 1002 defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED) 1003 /* Internal array allocator, outputs no error or warning messages on failure, 1004 * just returns NULL. 1005 */ 1006 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr, 1007 int nelements, size_t element_size),PNG_ALLOCATED); 1008 1009 /* The same but an existing array is extended by add_elements. This function 1010 * also memsets the new elements to 0 and copies the old elements. The old 1011 * array is not freed or altered. 1012 */ 1013 PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr, 1014 png_const_voidp array, int old_elements, int add_elements, 1015 size_t element_size),PNG_ALLOCATED); 1016 #endif /* text, sPLT or unknown chunks */ 1017 1018 /* Magic to create a struct when there is no struct to call the user supplied 1019 * memory allocators. Because error handling has not been set up the memory 1020 * handlers can't safely call png_error, but this is an obscure and undocumented 1021 * restriction so libpng has to assume that the 'free' handler, at least, might 1022 * call png_error. 1023 */ 1024 PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct, 1025 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, 1026 png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, 1027 png_free_ptr free_fn),PNG_ALLOCATED); 1028 1029 /* Free memory from internal libpng struct */ 1030 PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr), 1031 PNG_EMPTY); 1032 1033 /* Free an allocated jmp_buf (always succeeds) */ 1034 PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY); 1035 1036 /* Function to allocate memory for zlib. PNGAPI is disallowed. */ 1037 PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size), 1038 PNG_ALLOCATED); 1039 1040 /* Function to free memory for zlib. PNGAPI is disallowed. */ 1041 PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY); 1042 1043 /* Next four functions are used internally as callbacks. PNGCBAPI is required 1044 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to 1045 * PNGCBAPI at 1.5.0 1046 */ 1047 1048 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr, 1049 png_bytep data, size_t length),PNG_EMPTY); 1050 1051 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1052 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr, 1053 png_bytep buffer, size_t length),PNG_EMPTY); 1054 #endif 1055 1056 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr, 1057 png_bytep data, size_t length),PNG_EMPTY); 1058 1059 #ifdef PNG_WRITE_FLUSH_SUPPORTED 1060 # ifdef PNG_STDIO_SUPPORTED 1061 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr), 1062 PNG_EMPTY); 1063 # endif 1064 #endif 1065 1066 /* Reset the CRC variable */ 1067 PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY); 1068 1069 /* Write the "data" buffer to whatever output you are using */ 1070 PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr, 1071 png_const_bytep data, size_t length),PNG_EMPTY); 1072 1073 /* Read and check the PNG file signature */ 1074 PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr, 1075 png_inforp info_ptr),PNG_EMPTY); 1076 1077 /* Read the chunk header (length + type name) */ 1078 PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr), 1079 PNG_EMPTY); 1080 1081 /* Read data from whatever input you are using into the "data" buffer */ 1082 PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data, 1083 size_t length),PNG_EMPTY); 1084 1085 /* Read bytes into buf, and update png_ptr->crc */ 1086 PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf, 1087 png_uint_32 length),PNG_EMPTY); 1088 1089 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 1090 PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr, 1091 png_uint_32 skip),PNG_EMPTY); 1092 1093 /* Read the CRC from the file and compare it to the libpng calculated CRC */ 1094 PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY); 1095 1096 /* Calculate the CRC over a section of data. Note that we are only 1097 * passing a maximum of 64K on systems that have this as a memory limit, 1098 * since this is the maximum buffer size we can specify. 1099 */ 1100 PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr, 1101 png_const_bytep ptr, size_t length),PNG_EMPTY); 1102 1103 #ifdef PNG_WRITE_FLUSH_SUPPORTED 1104 PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY); 1105 #endif 1106 1107 /* Write various chunks */ 1108 1109 /* Write the IHDR chunk, and update the png_struct with the necessary 1110 * information. 1111 */ 1112 PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr, 1113 png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, 1114 int compression_method, int filter_method, int interlace_method),PNG_EMPTY); 1115 1116 PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr, 1117 png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY); 1118 1119 PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr, 1120 png_const_bytep row_data, png_alloc_size_t row_data_length, int flush), 1121 PNG_EMPTY); 1122 1123 PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY); 1124 1125 #ifdef PNG_WRITE_gAMA_SUPPORTED 1126 PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr, 1127 png_fixed_point file_gamma),PNG_EMPTY); 1128 #endif 1129 1130 #ifdef PNG_WRITE_sBIT_SUPPORTED 1131 PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr, 1132 png_const_color_8p sbit, int color_type),PNG_EMPTY); 1133 #endif 1134 1135 #ifdef PNG_WRITE_cHRM_SUPPORTED 1136 PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr, 1137 const png_xy *xy), PNG_EMPTY); 1138 /* The xy value must have been previously validated */ 1139 #endif 1140 1141 #ifdef PNG_WRITE_sRGB_SUPPORTED 1142 PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr, 1143 int intent),PNG_EMPTY); 1144 #endif 1145 1146 #ifdef PNG_WRITE_eXIf_SUPPORTED 1147 PNG_INTERNAL_FUNCTION(void,png_write_eXIf,(png_structrp png_ptr, 1148 png_bytep exif, int num_exif),PNG_EMPTY); 1149 #endif 1150 1151 #ifdef PNG_WRITE_iCCP_SUPPORTED 1152 PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr, 1153 png_const_charp name, png_const_bytep profile), PNG_EMPTY); 1154 /* The profile must have been previously validated for correctness, the 1155 * length comes from the first four bytes. Only the base, deflate, 1156 * compression is supported. 1157 */ 1158 #endif 1159 1160 #ifdef PNG_WRITE_sPLT_SUPPORTED 1161 PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr, 1162 png_const_sPLT_tp palette),PNG_EMPTY); 1163 #endif 1164 1165 #ifdef PNG_WRITE_tRNS_SUPPORTED 1166 PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr, 1167 png_const_bytep trans, png_const_color_16p values, int number, 1168 int color_type),PNG_EMPTY); 1169 #endif 1170 1171 #ifdef PNG_WRITE_bKGD_SUPPORTED 1172 PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr, 1173 png_const_color_16p values, int color_type),PNG_EMPTY); 1174 #endif 1175 1176 #ifdef PNG_WRITE_hIST_SUPPORTED 1177 PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr, 1178 png_const_uint_16p hist, int num_hist),PNG_EMPTY); 1179 #endif 1180 1181 /* Chunks that have keywords */ 1182 #ifdef PNG_WRITE_tEXt_SUPPORTED 1183 PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr, 1184 png_const_charp key, png_const_charp text, size_t text_len),PNG_EMPTY); 1185 #endif 1186 1187 #ifdef PNG_WRITE_zTXt_SUPPORTED 1188 PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp 1189 key, png_const_charp text, int compression),PNG_EMPTY); 1190 #endif 1191 1192 #ifdef PNG_WRITE_iTXt_SUPPORTED 1193 PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr, 1194 int compression, png_const_charp key, png_const_charp lang, 1195 png_const_charp lang_key, png_const_charp text),PNG_EMPTY); 1196 #endif 1197 1198 #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ 1199 PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr, 1200 png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY); 1201 #endif 1202 1203 #ifdef PNG_WRITE_oFFs_SUPPORTED 1204 PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr, 1205 png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY); 1206 #endif 1207 1208 #ifdef PNG_WRITE_pCAL_SUPPORTED 1209 PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr, 1210 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, 1211 png_const_charp units, png_charpp params),PNG_EMPTY); 1212 #endif 1213 1214 #ifdef PNG_WRITE_pHYs_SUPPORTED 1215 PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr, 1216 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 1217 int unit_type),PNG_EMPTY); 1218 #endif 1219 1220 #ifdef PNG_WRITE_tIME_SUPPORTED 1221 PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr, 1222 png_const_timep mod_time),PNG_EMPTY); 1223 #endif 1224 1225 #ifdef PNG_WRITE_sCAL_SUPPORTED 1226 PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr, 1227 int unit, png_const_charp width, png_const_charp height),PNG_EMPTY); 1228 #endif 1229 1230 /* Called when finished processing a row of data */ 1231 PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr), 1232 PNG_EMPTY); 1233 1234 /* Internal use only. Called before first row of data */ 1235 PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr), 1236 PNG_EMPTY); 1237 1238 /* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an 1239 * array of png_ptr->width pixels. If the image is not interlaced or this 1240 * is the final pass this just does a memcpy, otherwise the "display" flag 1241 * is used to determine whether to copy pixels that are not in the current pass. 1242 * 1243 * Because 'png_do_read_interlace' (below) replicates pixels this allows this 1244 * function to achieve the documented 'blocky' appearance during interlaced read 1245 * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row' 1246 * are not changed if they are not in the current pass, when display is 0. 1247 * 1248 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless. 1249 * 1250 * The API always reads from the png_struct row buffer and always assumes that 1251 * it is full width (png_do_read_interlace has already been called.) 1252 * 1253 * This function is only ever used to write to row buffers provided by the 1254 * caller of the relevant libpng API and the row must have already been 1255 * transformed by the read transformations. 1256 * 1257 * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed 1258 * bitmasks for use within the code, otherwise runtime generated masks are used. 1259 * The default is compile time masks. 1260 */ 1261 #ifndef PNG_USE_COMPILE_TIME_MASKS 1262 # define PNG_USE_COMPILE_TIME_MASKS 1 1263 #endif 1264 PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr, 1265 png_bytep row, int display),PNG_EMPTY); 1266 1267 #ifdef PNG_READ_INTERLACING_SUPPORTED 1268 /* Expand an interlaced row: the 'row_info' describes the pass data that has 1269 * been read in and must correspond to the pixels in 'row', the pixels are 1270 * expanded (moved apart) in 'row' to match the final layout, when doing this 1271 * the pixels are *replicated* to the intervening space. This is essential for 1272 * the correct operation of png_combine_row, above. 1273 */ 1274 PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info, 1275 png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY); 1276 #endif 1277 1278 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 1279 1280 #ifdef PNG_WRITE_INTERLACING_SUPPORTED 1281 /* Grab pixels out of a row for an interlaced pass */ 1282 PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info, 1283 png_bytep row, int pass),PNG_EMPTY); 1284 #endif 1285 1286 /* Unfilter a row: check the filter value before calling this, there is no point 1287 * calling it for PNG_FILTER_VALUE_NONE. 1288 */ 1289 PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop 1290 row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY); 1291 1292 #if PNG_ARM_NEON_OPT > 0 1293 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info, 1294 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1295 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop 1296 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1297 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop 1298 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1299 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop 1300 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1301 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop 1302 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1303 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop 1304 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1305 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop 1306 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1307 #endif 1308 1309 #if PNG_MIPS_MSA_OPT > 0 1310 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_msa,(png_row_infop row_info, 1311 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1312 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_msa,(png_row_infop 1313 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1314 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_msa,(png_row_infop 1315 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1316 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_msa,(png_row_infop 1317 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1318 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_msa,(png_row_infop 1319 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1320 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_msa,(png_row_infop 1321 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1322 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_msa,(png_row_infop 1323 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1324 #endif 1325 1326 #if PNG_POWERPC_VSX_OPT > 0 1327 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_vsx,(png_row_infop row_info, 1328 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1329 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_vsx,(png_row_infop 1330 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1331 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_vsx,(png_row_infop 1332 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1333 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_vsx,(png_row_infop 1334 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1335 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_vsx,(png_row_infop 1336 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1337 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_vsx,(png_row_infop 1338 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1339 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_vsx,(png_row_infop 1340 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1341 #endif 1342 1343 #if PNG_INTEL_SSE_IMPLEMENTATION > 0 1344 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_sse2,(png_row_infop 1345 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1346 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_sse2,(png_row_infop 1347 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1348 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_sse2,(png_row_infop 1349 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1350 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_sse2,(png_row_infop 1351 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1352 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_sse2,(png_row_infop 1353 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1354 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_sse2,(png_row_infop 1355 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1356 #endif 1357 1358 /* Choose the best filter to use and filter the row data */ 1359 PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr, 1360 png_row_infop row_info),PNG_EMPTY); 1361 1362 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED 1363 PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr, 1364 png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY); 1365 /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer 1366 * is NULL the function checks, instead, for the end of the stream. In this 1367 * case a benign error will be issued if the stream end is not found or if 1368 * extra data has to be consumed. 1369 */ 1370 PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr), 1371 PNG_EMPTY); 1372 /* This cleans up when the IDAT LZ stream does not end when the last image 1373 * byte is read; there is still some pending input. 1374 */ 1375 1376 PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr), 1377 PNG_EMPTY); 1378 /* Finish a row while reading, dealing with interlacing passes, etc. */ 1379 #endif /* SEQUENTIAL_READ */ 1380 1381 /* Initialize the row buffers, etc. */ 1382 PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY); 1383 1384 #if ZLIB_VERNUM >= 0x1240 1385 PNG_INTERNAL_FUNCTION(int,png_zlib_inflate,(png_structrp png_ptr, int flush), 1386 PNG_EMPTY); 1387 # define PNG_INFLATE(pp, flush) png_zlib_inflate(pp, flush) 1388 #else /* Zlib < 1.2.4 */ 1389 # define PNG_INFLATE(pp, flush) inflate(&(pp)->zstream, flush) 1390 #endif /* Zlib < 1.2.4 */ 1391 1392 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1393 /* Optional call to update the users info structure */ 1394 PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr, 1395 png_inforp info_ptr),PNG_EMPTY); 1396 #endif 1397 1398 /* Shared transform functions, defined in pngtran.c */ 1399 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 1400 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 1401 PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info, 1402 png_bytep row, int at_start),PNG_EMPTY); 1403 #endif 1404 1405 #ifdef PNG_16BIT_SUPPORTED 1406 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 1407 PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info, 1408 png_bytep row),PNG_EMPTY); 1409 #endif 1410 #endif 1411 1412 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ 1413 defined(PNG_WRITE_PACKSWAP_SUPPORTED) 1414 PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info, 1415 png_bytep row),PNG_EMPTY); 1416 #endif 1417 1418 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 1419 PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info, 1420 png_bytep row),PNG_EMPTY); 1421 #endif 1422 1423 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1424 PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info, 1425 png_bytep row),PNG_EMPTY); 1426 #endif 1427 1428 /* The following decodes the appropriate chunks, and does error correction, 1429 * then calls the appropriate callback for the chunk if it is valid. 1430 */ 1431 1432 /* Decode the IHDR chunk */ 1433 PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr, 1434 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1435 PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr, 1436 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1437 PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr, 1438 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1439 1440 #ifdef PNG_READ_bKGD_SUPPORTED 1441 PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr, 1442 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1443 #endif 1444 1445 #ifdef PNG_READ_cHRM_SUPPORTED 1446 PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr, 1447 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1448 #endif 1449 1450 #ifdef PNG_READ_eXIf_SUPPORTED 1451 PNG_INTERNAL_FUNCTION(void,png_handle_eXIf,(png_structrp png_ptr, 1452 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1453 #endif 1454 1455 #ifdef PNG_READ_gAMA_SUPPORTED 1456 PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr, 1457 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1458 #endif 1459 1460 #ifdef PNG_READ_hIST_SUPPORTED 1461 PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr, 1462 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1463 #endif 1464 1465 #ifdef PNG_READ_iCCP_SUPPORTED 1466 PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr, 1467 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1468 #endif /* READ_iCCP */ 1469 1470 #ifdef PNG_READ_iTXt_SUPPORTED 1471 PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr, 1472 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1473 #endif 1474 1475 #ifdef PNG_READ_oFFs_SUPPORTED 1476 PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr, 1477 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1478 #endif 1479 1480 #ifdef PNG_READ_pCAL_SUPPORTED 1481 PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr, 1482 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1483 #endif 1484 1485 #ifdef PNG_READ_pHYs_SUPPORTED 1486 PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr, 1487 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1488 #endif 1489 1490 #ifdef PNG_READ_sBIT_SUPPORTED 1491 PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr, 1492 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1493 #endif 1494 1495 #ifdef PNG_READ_sCAL_SUPPORTED 1496 PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr, 1497 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1498 #endif 1499 1500 #ifdef PNG_READ_sPLT_SUPPORTED 1501 PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr, 1502 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1503 #endif /* READ_sPLT */ 1504 1505 #ifdef PNG_READ_sRGB_SUPPORTED 1506 PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr, 1507 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1508 #endif 1509 1510 #ifdef PNG_READ_tEXt_SUPPORTED 1511 PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr, 1512 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1513 #endif 1514 1515 #ifdef PNG_READ_tIME_SUPPORTED 1516 PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr, 1517 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1518 #endif 1519 1520 #ifdef PNG_READ_tRNS_SUPPORTED 1521 PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr, 1522 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1523 #endif 1524 1525 #ifdef PNG_READ_zTXt_SUPPORTED 1526 PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr, 1527 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1528 #endif 1529 1530 PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_const_structrp png_ptr, 1531 png_uint_32 chunk_name),PNG_EMPTY); 1532 1533 PNG_INTERNAL_FUNCTION(void,png_check_chunk_length,(png_const_structrp png_ptr, 1534 png_uint_32 chunk_length),PNG_EMPTY); 1535 1536 PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr, 1537 png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY); 1538 /* This is the function that gets called for unknown chunks. The 'keep' 1539 * argument is either non-zero for a known chunk that has been set to be 1540 * handled as unknown or zero for an unknown chunk. By default the function 1541 * just skips the chunk or errors out if it is critical. 1542 */ 1543 1544 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\ 1545 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 1546 PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling, 1547 (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY); 1548 /* Exactly as the API png_handle_as_unknown() except that the argument is a 1549 * 32-bit chunk name, not a string. 1550 */ 1551 #endif /* READ_UNKNOWN_CHUNKS || HANDLE_AS_UNKNOWN */ 1552 1553 /* Handle the transformations for reading and writing */ 1554 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1555 PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr, 1556 png_row_infop row_info),PNG_EMPTY); 1557 #endif 1558 #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED 1559 PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr, 1560 png_row_infop row_info),PNG_EMPTY); 1561 #endif 1562 1563 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1564 PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr), 1565 PNG_EMPTY); 1566 #endif 1567 1568 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1569 PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr, 1570 png_inforp info_ptr),PNG_EMPTY); 1571 PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr, 1572 png_inforp info_ptr),PNG_EMPTY); 1573 PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY); 1574 PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr), 1575 PNG_EMPTY); 1576 PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr, 1577 png_bytep buffer, size_t buffer_length),PNG_EMPTY); 1578 PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY); 1579 PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr, 1580 png_bytep buffer, size_t buffer_length),PNG_EMPTY); 1581 PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr), 1582 PNG_EMPTY); 1583 PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr, 1584 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1585 PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr, 1586 png_inforp info_ptr),PNG_EMPTY); 1587 PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr, 1588 png_inforp info_ptr),PNG_EMPTY); 1589 PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr, 1590 png_bytep row),PNG_EMPTY); 1591 PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr, 1592 png_inforp info_ptr),PNG_EMPTY); 1593 PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr, 1594 png_inforp info_ptr),PNG_EMPTY); 1595 PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr), 1596 PNG_EMPTY); 1597 # ifdef PNG_READ_tEXt_SUPPORTED 1598 PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr, 1599 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1600 PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr, 1601 png_inforp info_ptr),PNG_EMPTY); 1602 # endif 1603 # ifdef PNG_READ_zTXt_SUPPORTED 1604 PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr, 1605 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1606 PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr, 1607 png_inforp info_ptr),PNG_EMPTY); 1608 # endif 1609 # ifdef PNG_READ_iTXt_SUPPORTED 1610 PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr, 1611 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1612 PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr, 1613 png_inforp info_ptr),PNG_EMPTY); 1614 # endif 1615 1616 #endif /* PROGRESSIVE_READ */ 1617 1618 /* Added at libpng version 1.6.0 */ 1619 #ifdef PNG_GAMMA_SUPPORTED 1620 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr, 1621 png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY); 1622 /* Set the colorspace gamma with a value provided by the application or by 1623 * the gAMA chunk on read. The value will override anything set by an ICC 1624 * profile. 1625 */ 1626 1627 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr, 1628 png_inforp info_ptr), PNG_EMPTY); 1629 /* Synchronize the info 'valid' flags with the colorspace */ 1630 1631 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr, 1632 png_inforp info_ptr), PNG_EMPTY); 1633 /* Copy the png_struct colorspace to the info_struct and call the above to 1634 * synchronize the flags. Checks for NULL info_ptr and does nothing. 1635 */ 1636 #endif 1637 1638 /* Added at libpng version 1.4.0 */ 1639 #ifdef PNG_COLORSPACE_SUPPORTED 1640 /* These internal functions are for maintaining the colorspace structure within 1641 * a png_info or png_struct (or, indeed, both). 1642 */ 1643 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities, 1644 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy, 1645 int preferred), PNG_EMPTY); 1646 1647 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints, 1648 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ, 1649 int preferred), PNG_EMPTY); 1650 1651 #ifdef PNG_sRGB_SUPPORTED 1652 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr, 1653 png_colorspacerp colorspace, int intent), PNG_EMPTY); 1654 /* This does set the colorspace gAMA and cHRM values too, but doesn't set the 1655 * flags to write them, if it returns false there was a problem and an error 1656 * message has already been output (but the colorspace may still need to be 1657 * synced to record the invalid flag). 1658 */ 1659 #endif /* sRGB */ 1660 1661 #ifdef PNG_iCCP_SUPPORTED 1662 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr, 1663 png_colorspacerp colorspace, png_const_charp name, 1664 png_uint_32 profile_length, png_const_bytep profile, int color_type), 1665 PNG_EMPTY); 1666 /* The 'name' is used for information only */ 1667 1668 /* Routines for checking parts of an ICC profile. */ 1669 #ifdef PNG_READ_iCCP_SUPPORTED 1670 PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr, 1671 png_colorspacerp colorspace, png_const_charp name, 1672 png_uint_32 profile_length), PNG_EMPTY); 1673 #endif /* READ_iCCP */ 1674 PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr, 1675 png_colorspacerp colorspace, png_const_charp name, 1676 png_uint_32 profile_length, 1677 png_const_bytep profile /* first 132 bytes only */, int color_type), 1678 PNG_EMPTY); 1679 PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr, 1680 png_colorspacerp colorspace, png_const_charp name, 1681 png_uint_32 profile_length, 1682 png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY); 1683 #ifdef PNG_sRGB_SUPPORTED 1684 PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,( 1685 png_const_structrp png_ptr, png_colorspacerp colorspace, 1686 png_const_bytep profile, uLong adler), PNG_EMPTY); 1687 /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may 1688 * be zero to indicate that it is not available. It is used, if provided, 1689 * as a fast check on the profile when checking to see if it is sRGB. 1690 */ 1691 #endif 1692 #endif /* iCCP */ 1693 1694 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1695 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients, 1696 (png_structrp png_ptr), PNG_EMPTY); 1697 /* Set the rgb_to_gray coefficients from the colorspace Y values */ 1698 #endif /* READ_RGB_TO_GRAY */ 1699 #endif /* COLORSPACE */ 1700 1701 /* Added at libpng version 1.4.0 */ 1702 PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr, 1703 png_uint_32 width, png_uint_32 height, int bit_depth, 1704 int color_type, int interlace_type, int compression_type, 1705 int filter_type),PNG_EMPTY); 1706 1707 /* Added at libpng version 1.5.10 */ 1708 #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \ 1709 defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED) 1710 PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes, 1711 (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY); 1712 #endif 1713 1714 #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) 1715 PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr, 1716 png_const_charp name),PNG_NORETURN); 1717 #endif 1718 1719 /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite 1720 * the end. Always leaves the buffer nul terminated. Never errors out (and 1721 * there is no error code.) 1722 */ 1723 PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize, 1724 size_t pos, png_const_charp string),PNG_EMPTY); 1725 1726 /* Various internal functions to handle formatted warning messages, currently 1727 * only implemented for warnings. 1728 */ 1729 #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) 1730 /* Utility to dump an unsigned value into a buffer, given a start pointer and 1731 * and end pointer (which should point just *beyond* the end of the buffer!) 1732 * Returns the pointer to the start of the formatted string. This utility only 1733 * does unsigned values. 1734 */ 1735 PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start, 1736 png_charp end, int format, png_alloc_size_t number),PNG_EMPTY); 1737 1738 /* Convenience macro that takes an array: */ 1739 #define PNG_FORMAT_NUMBER(buffer,format,number) \ 1740 png_format_number(buffer, buffer + (sizeof buffer), format, number) 1741 1742 /* Suggested size for a number buffer (enough for 64 bits and a sign!) */ 1743 #define PNG_NUMBER_BUFFER_SIZE 24 1744 1745 /* These are the integer formats currently supported, the name is formed from 1746 * the standard printf(3) format string. 1747 */ 1748 #define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */ 1749 #define PNG_NUMBER_FORMAT_02u 2 1750 #define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */ 1751 #define PNG_NUMBER_FORMAT_02d 2 1752 #define PNG_NUMBER_FORMAT_x 3 1753 #define PNG_NUMBER_FORMAT_02x 4 1754 #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */ 1755 #endif 1756 1757 #ifdef PNG_WARNINGS_SUPPORTED 1758 /* New defines and members adding in libpng-1.5.4 */ 1759 # define PNG_WARNING_PARAMETER_SIZE 32 1760 # define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */ 1761 1762 /* An l-value of this type has to be passed to the APIs below to cache the 1763 * values of the parameters to a formatted warning message. 1764 */ 1765 typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][ 1766 PNG_WARNING_PARAMETER_SIZE]; 1767 1768 PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p, 1769 int number, png_const_charp string),PNG_EMPTY); 1770 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters, 1771 * including the trailing '\0'. 1772 */ 1773 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned, 1774 (png_warning_parameters p, int number, int format, png_alloc_size_t value), 1775 PNG_EMPTY); 1776 /* Use png_alloc_size_t because it is an unsigned type as big as any we 1777 * need to output. Use the following for a signed value. 1778 */ 1779 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed, 1780 (png_warning_parameters p, int number, int format, png_int_32 value), 1781 PNG_EMPTY); 1782 1783 PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr, 1784 png_warning_parameters p, png_const_charp message),PNG_EMPTY); 1785 /* 'message' follows the X/Open approach of using @1, @2 to insert 1786 * parameters previously supplied using the above functions. Errors in 1787 * specifying the parameters will simply result in garbage substitutions. 1788 */ 1789 #endif 1790 1791 #ifdef PNG_BENIGN_ERRORS_SUPPORTED 1792 /* Application errors (new in 1.6); use these functions (declared below) for 1793 * errors in the parameters or order of API function calls on read. The 1794 * 'warning' should be used for an error that can be handled completely; the 1795 * 'error' for one which can be handled safely but which may lose application 1796 * information or settings. 1797 * 1798 * By default these both result in a png_error call prior to release, while in a 1799 * released version the 'warning' is just a warning. However if the application 1800 * explicitly disables benign errors (explicitly permitting the code to lose 1801 * information) they both turn into warnings. 1802 * 1803 * If benign errors aren't supported they end up as the corresponding base call 1804 * (png_warning or png_error.) 1805 */ 1806 PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr, 1807 png_const_charp message),PNG_EMPTY); 1808 /* The application provided invalid parameters to an API function or called 1809 * an API function at the wrong time, libpng can completely recover. 1810 */ 1811 1812 PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr, 1813 png_const_charp message),PNG_EMPTY); 1814 /* As above but libpng will ignore the call, or attempt some other partial 1815 * recovery from the error. 1816 */ 1817 #else 1818 # define png_app_warning(pp,s) png_warning(pp,s) 1819 # define png_app_error(pp,s) png_error(pp,s) 1820 #endif 1821 1822 PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr, 1823 png_const_charp message, int error),PNG_EMPTY); 1824 /* Report a recoverable issue in chunk data. On read this is used to report 1825 * a problem found while reading a particular chunk and the 1826 * png_chunk_benign_error or png_chunk_warning function is used as 1827 * appropriate. On write this is used to report an error that comes from 1828 * data set via an application call to a png_set_ API and png_app_error or 1829 * png_app_warning is used as appropriate. 1830 * 1831 * The 'error' parameter must have one of the following values: 1832 */ 1833 #define PNG_CHUNK_WARNING 0 /* never an error */ 1834 #define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */ 1835 #define PNG_CHUNK_ERROR 2 /* always an error */ 1836 1837 /* ASCII to FP interfaces, currently only implemented if sCAL 1838 * support is required. 1839 */ 1840 #if defined(PNG_sCAL_SUPPORTED) 1841 /* MAX_DIGITS is actually the maximum number of characters in an sCAL 1842 * width or height, derived from the precision (number of significant 1843 * digits - a build time settable option) and assumptions about the 1844 * maximum ridiculous exponent. 1845 */ 1846 #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/) 1847 1848 #ifdef PNG_FLOATING_POINT_SUPPORTED 1849 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr, 1850 png_charp ascii, size_t size, double fp, unsigned int precision), 1851 PNG_EMPTY); 1852 #endif /* FLOATING_POINT */ 1853 1854 #ifdef PNG_FIXED_POINT_SUPPORTED 1855 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr, 1856 png_charp ascii, size_t size, png_fixed_point fp),PNG_EMPTY); 1857 #endif /* FIXED_POINT */ 1858 #endif /* sCAL */ 1859 1860 #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) 1861 /* An internal API to validate the format of a floating point number. 1862 * The result is the index of the next character. If the number is 1863 * not valid it will be the index of a character in the supposed number. 1864 * 1865 * The format of a number is defined in the PNG extensions specification 1866 * and this API is strictly conformant to that spec, not anyone elses! 1867 * 1868 * The format as a regular expression is: 1869 * 1870 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)? 1871 * 1872 * or: 1873 * 1874 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)? 1875 * 1876 * The complexity is that either integer or fraction must be present and the 1877 * fraction is permitted to have no digits only if the integer is present. 1878 * 1879 * NOTE: The dangling E problem. 1880 * There is a PNG valid floating point number in the following: 1881 * 1882 * PNG floating point numbers are not greedy. 1883 * 1884 * Working this out requires *TWO* character lookahead (because of the 1885 * sign), the parser does not do this - it will fail at the 'r' - this 1886 * doesn't matter for PNG sCAL chunk values, but it requires more care 1887 * if the value were ever to be embedded in something more complex. Use 1888 * ANSI-C strtod if you need the lookahead. 1889 */ 1890 /* State table for the parser. */ 1891 #define PNG_FP_INTEGER 0 /* before or in integer */ 1892 #define PNG_FP_FRACTION 1 /* before or in fraction */ 1893 #define PNG_FP_EXPONENT 2 /* before or in exponent */ 1894 #define PNG_FP_STATE 3 /* mask for the above */ 1895 #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */ 1896 #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */ 1897 #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */ 1898 #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */ 1899 #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */ 1900 1901 /* These three values don't affect the parser. They are set but not used. 1902 */ 1903 #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */ 1904 #define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */ 1905 #define PNG_FP_NONZERO 256 /* A non-zero value */ 1906 #define PNG_FP_STICKY 448 /* The above three flags */ 1907 1908 /* This is available for the caller to store in 'state' if required. Do not 1909 * call the parser after setting it (the parser sometimes clears it.) 1910 */ 1911 #define PNG_FP_INVALID 512 /* Available for callers as a distinct value */ 1912 1913 /* Result codes for the parser (boolean - true meants ok, false means 1914 * not ok yet.) 1915 */ 1916 #define PNG_FP_MAYBE 0 /* The number may be valid in the future */ 1917 #define PNG_FP_OK 1 /* The number is valid */ 1918 1919 /* Tests on the sticky non-zero and negative flags. To pass these checks 1920 * the state must also indicate that the whole number is valid - this is 1921 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this 1922 * is equivalent to PNG_FP_OK above.) 1923 */ 1924 #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO) 1925 /* NZ_MASK: the string is valid and a non-zero negative value */ 1926 #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO) 1927 /* Z MASK: the string is valid and a non-zero value. */ 1928 /* PNG_FP_SAW_DIGIT: the string is valid. */ 1929 #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT) 1930 #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK) 1931 #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK) 1932 1933 /* The actual parser. This can be called repeatedly. It updates 1934 * the index into the string and the state variable (which must 1935 * be initialized to 0). It returns a result code, as above. There 1936 * is no point calling the parser any more if it fails to advance to 1937 * the end of the string - it is stuck on an invalid character (or 1938 * terminated by '\0'). 1939 * 1940 * Note that the pointer will consume an E or even an E+ and then leave 1941 * a 'maybe' state even though a preceding integer.fraction is valid. 1942 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was 1943 * a valid number. It's possible to recover from this by calling 1944 * the parser again (from the start, with state 0) but with a string 1945 * that omits the last character (i.e. set the size to the index of 1946 * the problem character.) This has not been tested within libpng. 1947 */ 1948 PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string, 1949 size_t size, int *statep, size_t *whereami),PNG_EMPTY); 1950 1951 /* This is the same but it checks a complete string and returns true 1952 * only if it just contains a floating point number. As of 1.5.4 this 1953 * function also returns the state at the end of parsing the number if 1954 * it was valid (otherwise it returns 0.) This can be used for testing 1955 * for negative or zero values using the sticky flag. 1956 */ 1957 PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string, 1958 size_t size),PNG_EMPTY); 1959 #endif /* pCAL || sCAL */ 1960 1961 #if defined(PNG_GAMMA_SUPPORTED) ||\ 1962 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED) 1963 /* Added at libpng version 1.5.0 */ 1964 /* This is a utility to provide a*times/div (rounded) and indicate 1965 * if there is an overflow. The result is a boolean - false (0) 1966 * for overflow, true (1) if no overflow, in which case *res 1967 * holds the result. 1968 */ 1969 PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a, 1970 png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY); 1971 #endif 1972 1973 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED) 1974 /* Same deal, but issue a warning on overflow and return 0. */ 1975 PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn, 1976 (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by, 1977 png_int_32 divided_by),PNG_EMPTY); 1978 #endif 1979 1980 #ifdef PNG_GAMMA_SUPPORTED 1981 /* Calculate a reciprocal - used for gamma values. This returns 1982 * 0 if the argument is 0 in order to maintain an undefined value; 1983 * there are no warnings. 1984 */ 1985 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a), 1986 PNG_EMPTY); 1987 1988 #ifdef PNG_READ_GAMMA_SUPPORTED 1989 /* The same but gives a reciprocal of the product of two fixed point 1990 * values. Accuracy is suitable for gamma calculations but this is 1991 * not exact - use png_muldiv for that. Only required at present on read. 1992 */ 1993 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a, 1994 png_fixed_point b),PNG_EMPTY); 1995 #endif 1996 1997 /* Return true if the gamma value is significantly different from 1.0 */ 1998 PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value), 1999 PNG_EMPTY); 2000 #endif 2001 2002 #ifdef PNG_READ_GAMMA_SUPPORTED 2003 /* Internal fixed point gamma correction. These APIs are called as 2004 * required to convert single values - they don't need to be fast, 2005 * they are not used when processing image pixel values. 2006 * 2007 * While the input is an 'unsigned' value it must actually be the 2008 * correct bit value - 0..255 or 0..65535 as required. 2009 */ 2010 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr, 2011 unsigned int value, png_fixed_point gamma_value),PNG_EMPTY); 2012 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value, 2013 png_fixed_point gamma_value),PNG_EMPTY); 2014 PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value, 2015 png_fixed_point gamma_value),PNG_EMPTY); 2016 PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr), 2017 PNG_EMPTY); 2018 PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr, 2019 int bit_depth),PNG_EMPTY); 2020 #endif 2021 2022 /* SIMPLIFIED READ/WRITE SUPPORT */ 2023 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 2024 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 2025 /* The internal structure that png_image::opaque points to. */ 2026 typedef struct png_control 2027 { 2028 png_structp png_ptr; 2029 png_infop info_ptr; 2030 png_voidp error_buf; /* Always a jmp_buf at present. */ 2031 2032 png_const_bytep memory; /* Memory buffer. */ 2033 size_t size; /* Size of the memory buffer. */ 2034 2035 unsigned int for_write :1; /* Otherwise it is a read structure */ 2036 unsigned int owned_file :1; /* We own the file in io_ptr */ 2037 } png_control; 2038 2039 /* Return the pointer to the jmp_buf from a png_control: necessary because C 2040 * does not reveal the type of the elements of jmp_buf. 2041 */ 2042 #ifdef __cplusplus 2043 # define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0]) 2044 #else 2045 # define png_control_jmp_buf(pc) ((pc)->error_buf) 2046 #endif 2047 2048 /* Utility to safely execute a piece of libpng code catching and logging any 2049 * errors that might occur. Returns true on success, false on failure (either 2050 * of the function or as a result of a png_error.) 2051 */ 2052 PNG_INTERNAL_CALLBACK(void,png_safe_error,(png_structp png_ptr, 2053 png_const_charp error_message),PNG_NORETURN); 2054 2055 #ifdef PNG_WARNINGS_SUPPORTED 2056 PNG_INTERNAL_CALLBACK(void,png_safe_warning,(png_structp png_ptr, 2057 png_const_charp warning_message),PNG_EMPTY); 2058 #else 2059 # define png_safe_warning 0/*dummy argument*/ 2060 #endif 2061 2062 PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image, 2063 int (*function)(png_voidp), png_voidp arg),PNG_EMPTY); 2064 2065 /* Utility to log an error; this also cleans up the png_image; the function 2066 * always returns 0 (false). 2067 */ 2068 PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image, 2069 png_const_charp error_message),PNG_EMPTY); 2070 2071 #ifndef PNG_SIMPLIFIED_READ_SUPPORTED 2072 /* png_image_free is used by the write code but not exported */ 2073 PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY); 2074 #endif /* !SIMPLIFIED_READ */ 2075 2076 #endif /* SIMPLIFIED READ/WRITE */ 2077 2078 /* These are initialization functions for hardware specific PNG filter 2079 * optimizations; list these here then select the appropriate one at compile 2080 * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined 2081 * the generic code is used. 2082 */ 2083 #ifdef PNG_FILTER_OPTIMIZATIONS 2084 PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr, 2085 unsigned int bpp), PNG_EMPTY); 2086 /* Just declare the optimization that will be used */ 2087 #else 2088 /* List *all* the possible optimizations here - this branch is required if 2089 * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in 2090 * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing. 2091 */ 2092 # if PNG_ARM_NEON_OPT > 0 2093 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon, 2094 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2095 #endif 2096 2097 #if PNG_MIPS_MSA_OPT > 0 2098 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_msa, 2099 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2100 #endif 2101 2102 # if PNG_INTEL_SSE_IMPLEMENTATION > 0 2103 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_sse2, 2104 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2105 # endif 2106 #endif 2107 2108 PNG_INTERNAL_FUNCTION(png_uint_32, png_check_keyword, (png_structrp png_ptr, 2109 png_const_charp key, png_bytep new_key), PNG_EMPTY); 2110 2111 #if PNG_ARM_NEON_IMPLEMENTATION == 1 2112 PNG_INTERNAL_FUNCTION(void, 2113 png_riffle_palette_neon, 2114 (png_structrp), 2115 PNG_EMPTY); 2116 PNG_INTERNAL_FUNCTION(int, 2117 png_do_expand_palette_rgba8_neon, 2118 (png_structrp, 2119 png_row_infop, 2120 png_const_bytep, 2121 const png_bytepp, 2122 const png_bytepp), 2123 PNG_EMPTY); 2124 PNG_INTERNAL_FUNCTION(int, 2125 png_do_expand_palette_rgb8_neon, 2126 (png_structrp, 2127 png_row_infop, 2128 png_const_bytep, 2129 const png_bytepp, 2130 const png_bytepp), 2131 PNG_EMPTY); 2132 #endif 2133 2134 /* Maintainer: Put new private prototypes here ^ */ 2135 2136 #include "pngdebug.h" 2137 2138 #ifdef __cplusplus 2139 } 2140 #endif 2141 2142 #endif /* PNG_VERSION_INFO_ONLY */ 2143 #endif /* PNGPRIV_H */ 2144