1 2 /* pngpriv.h - private declarations for use inside libpng 3 * 4 * Copyright (c) 2018-2024 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) && \ 194 defined(PNG_ALIGNED_MEMORY_SUPPORTED) 195 # define PNG_MIPS_MSA_OPT 2 196 # else 197 # define PNG_MIPS_MSA_OPT 0 198 # endif 199 #endif 200 201 #ifndef PNG_MIPS_MMI_OPT 202 # ifdef PNG_MIPS_MMI 203 # if defined(__mips_loongson_mmi) && (_MIPS_SIM == _ABI64) && \ 204 defined(PNG_ALIGNED_MEMORY_SUPPORTED) 205 # define PNG_MIPS_MMI_OPT 1 206 # else 207 # define PNG_MIPS_MMI_OPT 0 208 # endif 209 # else 210 # define PNG_MIPS_MMI_OPT 0 211 # endif 212 #endif 213 214 #ifndef PNG_POWERPC_VSX_OPT 215 # if defined(__PPC64__) && defined(__ALTIVEC__) && defined(__VSX__) 216 # define PNG_POWERPC_VSX_OPT 2 217 # else 218 # define PNG_POWERPC_VSX_OPT 0 219 # endif 220 #endif 221 222 #ifndef PNG_LOONGARCH_LSX_OPT 223 # if defined(__loongarch_sx) 224 # define PNG_LOONGARCH_LSX_OPT 1 225 # else 226 # define PNG_LOONGARCH_LSX_OPT 0 227 # endif 228 #endif 229 230 #ifndef PNG_INTEL_SSE_OPT 231 # ifdef PNG_INTEL_SSE 232 /* Only check for SSE if the build configuration has been modified to 233 * enable SSE optimizations. This means that these optimizations will 234 * be off by default. See contrib/intel for more details. 235 */ 236 # if defined(__SSE4_1__) || defined(__AVX__) || defined(__SSSE3__) || \ 237 defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \ 238 (defined(_M_IX86_FP) && _M_IX86_FP >= 2) 239 # define PNG_INTEL_SSE_OPT 1 240 # else 241 # define PNG_INTEL_SSE_OPT 0 242 # endif 243 # else 244 # define PNG_INTEL_SSE_OPT 0 245 # endif 246 #endif 247 248 #if PNG_INTEL_SSE_OPT > 0 249 # ifndef PNG_INTEL_SSE_IMPLEMENTATION 250 # if defined(__SSE4_1__) || defined(__AVX__) 251 /* We are not actually using AVX, but checking for AVX is the best 252 way we can detect SSE4.1 and SSSE3 on MSVC. 253 */ 254 # define PNG_INTEL_SSE_IMPLEMENTATION 3 255 # elif defined(__SSSE3__) 256 # define PNG_INTEL_SSE_IMPLEMENTATION 2 257 # elif defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \ 258 (defined(_M_IX86_FP) && _M_IX86_FP >= 2) 259 # define PNG_INTEL_SSE_IMPLEMENTATION 1 260 # else 261 # define PNG_INTEL_SSE_IMPLEMENTATION 0 262 # endif 263 # endif 264 265 # if PNG_INTEL_SSE_IMPLEMENTATION > 0 266 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_sse2 267 # endif 268 #else 269 # define PNG_INTEL_SSE_IMPLEMENTATION 0 270 #endif 271 272 #if PNG_MIPS_MSA_OPT > 0 273 # ifndef PNG_MIPS_MSA_IMPLEMENTATION 274 # if defined(__mips_msa) 275 # if defined(__clang__) 276 # elif defined(__GNUC__) 277 # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7) 278 # define PNG_MIPS_MSA_IMPLEMENTATION 2 279 # endif /* no GNUC support */ 280 # endif /* __GNUC__ */ 281 # else /* !defined __mips_msa */ 282 # define PNG_MIPS_MSA_IMPLEMENTATION 2 283 # endif /* __mips_msa */ 284 # endif /* !PNG_MIPS_MSA_IMPLEMENTATION */ 285 286 # ifndef PNG_MIPS_MSA_IMPLEMENTATION 287 # define PNG_MIPS_MSA_IMPLEMENTATION 1 288 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_mips 289 # endif 290 #else 291 # define PNG_MIPS_MSA_IMPLEMENTATION 0 292 #endif /* PNG_MIPS_MSA_OPT > 0 */ 293 294 #if PNG_MIPS_MMI_OPT > 0 295 # ifndef PNG_MIPS_MMI_IMPLEMENTATION 296 # if defined(__mips_loongson_mmi) && (_MIPS_SIM == _ABI64) 297 # define PNG_MIPS_MMI_IMPLEMENTATION 2 298 # else /* !defined __mips_loongson_mmi || _MIPS_SIM != _ABI64 */ 299 # define PNG_MIPS_MMI_IMPLEMENTATION 0 300 # endif /* __mips_loongson_mmi && _MIPS_SIM == _ABI64 */ 301 # endif /* !PNG_MIPS_MMI_IMPLEMENTATION */ 302 303 # if PNG_MIPS_MMI_IMPLEMENTATION > 0 304 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_mips 305 # endif 306 #else 307 # define PNG_MIPS_MMI_IMPLEMENTATION 0 308 #endif /* PNG_MIPS_MMI_OPT > 0 */ 309 310 #if PNG_POWERPC_VSX_OPT > 0 311 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_vsx 312 # define PNG_POWERPC_VSX_IMPLEMENTATION 1 313 #else 314 # define PNG_POWERPC_VSX_IMPLEMENTATION 0 315 #endif 316 317 #if PNG_LOONGARCH_LSX_OPT > 0 318 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_lsx 319 # define PNG_LOONGARCH_LSX_IMPLEMENTATION 1 320 #else 321 # define PNG_LOONGARCH_LSX_IMPLEMENTATION 0 322 #endif 323 324 /* Is this a build of a DLL where compilation of the object modules requires 325 * different preprocessor settings to those required for a simple library? If 326 * so PNG_BUILD_DLL must be set. 327 * 328 * If libpng is used inside a DLL but that DLL does not export the libpng APIs 329 * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a 330 * static library of libpng then link the DLL against that. 331 */ 332 #ifndef PNG_BUILD_DLL 333 # ifdef DLL_EXPORT 334 /* This is set by libtool when files are compiled for a DLL; libtool 335 * always compiles twice, even on systems where it isn't necessary. Set 336 * PNG_BUILD_DLL in case it is necessary: 337 */ 338 # define PNG_BUILD_DLL 339 # else 340 # ifdef _WINDLL 341 /* This is set by the Microsoft Visual Studio IDE in projects that 342 * build a DLL. It can't easily be removed from those projects (it 343 * isn't visible in the Visual Studio UI) so it is a fairly reliable 344 * indication that PNG_IMPEXP needs to be set to the DLL export 345 * attributes. 346 */ 347 # define PNG_BUILD_DLL 348 # else 349 # ifdef __DLL__ 350 /* This is set by the Borland C system when compiling for a DLL 351 * (as above.) 352 */ 353 # define PNG_BUILD_DLL 354 # else 355 /* Add additional compiler cases here. */ 356 # endif 357 # endif 358 # endif 359 #endif /* Setting PNG_BUILD_DLL if required */ 360 361 /* See pngconf.h for more details: the builder of the library may set this on 362 * the command line to the right thing for the specific compilation system or it 363 * may be automagically set above (at present we know of no system where it does 364 * need to be set on the command line.) 365 * 366 * PNG_IMPEXP must be set here when building the library to prevent pngconf.h 367 * setting it to the "import" setting for a DLL build. 368 */ 369 #ifndef PNG_IMPEXP 370 # ifdef PNG_BUILD_DLL 371 # define PNG_IMPEXP PNG_DLL_EXPORT 372 # else 373 /* Not building a DLL, or the DLL doesn't require specific export 374 * definitions. 375 */ 376 # define PNG_IMPEXP 377 # endif 378 #endif 379 380 /* No warnings for private or deprecated functions in the build: */ 381 #ifndef PNG_DEPRECATED 382 # define PNG_DEPRECATED 383 #endif 384 #ifndef PNG_PRIVATE 385 # define PNG_PRIVATE 386 #endif 387 388 /* Symbol preprocessing support. 389 * 390 * To enable listing global, but internal, symbols the following macros should 391 * always be used to declare an extern data or function object in this file. 392 */ 393 #ifndef PNG_INTERNAL_DATA 394 # define PNG_INTERNAL_DATA(type, name, array) PNG_LINKAGE_DATA type name array 395 #endif 396 397 #ifndef PNG_INTERNAL_FUNCTION 398 # define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\ 399 PNG_LINKAGE_FUNCTION PNG_FUNCTION(type, name, args, PNG_EMPTY attributes) 400 #endif 401 402 #ifndef PNG_INTERNAL_CALLBACK 403 # define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\ 404 PNG_LINKAGE_CALLBACK PNG_FUNCTION(type, (PNGCBAPI name), args,\ 405 PNG_EMPTY attributes) 406 #endif 407 408 /* If floating or fixed point APIs are disabled they may still be compiled 409 * internally. To handle this make sure they are declared as the appropriate 410 * internal extern function (otherwise the symbol prefixing stuff won't work and 411 * the functions will be used without definitions.) 412 * 413 * NOTE: although all the API functions are declared here they are not all 414 * actually built! Because the declarations are still made it is necessary to 415 * fake out types that they depend on. 416 */ 417 #ifndef PNG_FP_EXPORT 418 # ifndef PNG_FLOATING_POINT_SUPPORTED 419 # define PNG_FP_EXPORT(ordinal, type, name, args)\ 420 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 421 # ifndef PNG_VERSION_INFO_ONLY 422 typedef struct png_incomplete png_double; 423 typedef png_double* png_doublep; 424 typedef const png_double* png_const_doublep; 425 typedef png_double** png_doublepp; 426 # endif 427 # endif 428 #endif 429 #ifndef PNG_FIXED_EXPORT 430 # ifndef PNG_FIXED_POINT_SUPPORTED 431 # define PNG_FIXED_EXPORT(ordinal, type, name, args)\ 432 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 433 # endif 434 #endif 435 436 #include "png.h" 437 438 /* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */ 439 #ifndef PNG_DLL_EXPORT 440 # define PNG_DLL_EXPORT 441 #endif 442 443 /* This is a global switch to set the compilation for an installed system 444 * (a release build). It can be set for testing debug builds to ensure that 445 * they will compile when the build type is switched to RC or STABLE, the 446 * default is just to use PNG_LIBPNG_BUILD_BASE_TYPE. Set this in CPPFLAGS 447 * with either: 448 * 449 * -DPNG_RELEASE_BUILD Turns on the release compile path 450 * -DPNG_RELEASE_BUILD=0 Turns it off 451 * or in your pngusr.h with 452 * #define PNG_RELEASE_BUILD=1 Turns on the release compile path 453 * #define PNG_RELEASE_BUILD=0 Turns it off 454 */ 455 #ifndef PNG_RELEASE_BUILD 456 # define PNG_RELEASE_BUILD (PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC) 457 #endif 458 459 /* SECURITY and SAFETY: 460 * 461 * libpng is built with support for internal limits on image dimensions and 462 * memory usage. These are documented in scripts/pnglibconf.dfa of the 463 * source and recorded in the machine generated header file pnglibconf.h. 464 */ 465 466 /* If you are running on a machine where you cannot allocate more 467 * than 64K of memory at once, uncomment this. While libpng will not 468 * normally need that much memory in a chunk (unless you load up a very 469 * large file), zlib needs to know how big of a chunk it can use, and 470 * libpng thus makes sure to check any memory allocation to verify it 471 * will fit into memory. 472 * 473 * zlib provides 'MAXSEG_64K' which, if defined, indicates the 474 * same limit and pngconf.h (already included) sets the limit 475 * if certain operating systems are detected. 476 */ 477 #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K) 478 # define PNG_MAX_MALLOC_64K 479 #endif 480 481 #ifndef PNG_UNUSED 482 /* Unused formal parameter warnings are silenced using the following macro 483 * which is expected to have no bad effects on performance (optimizing 484 * compilers will probably remove it entirely). Note that if you replace 485 * it with something other than whitespace, you must include the terminating 486 * semicolon. 487 */ 488 # define PNG_UNUSED(param) (void)param; 489 #endif 490 491 /* Just a little check that someone hasn't tried to define something 492 * contradictory. 493 */ 494 #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K) 495 # undef PNG_ZBUF_SIZE 496 # define PNG_ZBUF_SIZE 65536L 497 #endif 498 499 /* If warnings or errors are turned off the code is disabled or redirected here. 500 * From 1.5.4 functions have been added to allow very limited formatting of 501 * error and warning messages - this code will also be disabled here. 502 */ 503 #ifdef PNG_WARNINGS_SUPPORTED 504 # define PNG_WARNING_PARAMETERS(p) png_warning_parameters p; 505 #else 506 # define png_warning_parameter(p,number,string) ((void)0) 507 # define png_warning_parameter_unsigned(p,number,format,value) ((void)0) 508 # define png_warning_parameter_signed(p,number,format,value) ((void)0) 509 # define png_formatted_warning(pp,p,message) ((void)(pp)) 510 # define PNG_WARNING_PARAMETERS(p) 511 #endif 512 #ifndef PNG_ERROR_TEXT_SUPPORTED 513 # define png_fixed_error(s1,s2) png_err(s1) 514 #endif 515 516 /* Some fixed point APIs are still required even if not exported because 517 * they get used by the corresponding floating point APIs. This magic 518 * deals with this: 519 */ 520 #ifdef PNG_FIXED_POINT_SUPPORTED 521 # define PNGFAPI PNGAPI 522 #else 523 # define PNGFAPI /* PRIVATE */ 524 #endif 525 526 #ifndef PNG_VERSION_INFO_ONLY 527 /* Other defines specific to compilers can go here. Try to keep 528 * them inside an appropriate ifdef/endif pair for portability. 529 */ 530 531 /* C allows up-casts from (void*) to any pointer and (const void*) to any 532 * pointer to a const object. C++ regards this as a type error and requires an 533 * explicit, static, cast and provides the static_cast<> rune to ensure that 534 * const is not cast away. 535 */ 536 #ifdef __cplusplus 537 # define png_voidcast(type, value) static_cast<type>(value) 538 # define png_constcast(type, value) const_cast<type>(value) 539 # define png_aligncast(type, value) \ 540 static_cast<type>(static_cast<void*>(value)) 541 # define png_aligncastconst(type, value) \ 542 static_cast<type>(static_cast<const void*>(value)) 543 #else 544 # define png_voidcast(type, value) (value) 545 # define png_constcast(type, value) ((type)(void*)(const void*)(value)) 546 # define png_aligncast(type, value) ((void*)(value)) 547 # define png_aligncastconst(type, value) ((const void*)(value)) 548 #endif /* __cplusplus */ 549 550 #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\ 551 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) 552 /* png.c requires the following ANSI-C constants if the conversion of 553 * floating point to ASCII is implemented therein: 554 * 555 * DBL_DIG Maximum number of decimal digits (can be set to any constant) 556 * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value) 557 * DBL_MAX Maximum floating point number (can be set to an arbitrary value) 558 */ 559 # include <float.h> 560 561 # include <math.h> 562 563 # if defined(_AMIGA) && defined(__SASC) && defined(_M68881) 564 /* Amiga SAS/C: We must include builtin FPU functions when compiling using 565 * MATH=68881 566 */ 567 # include <m68881.h> 568 # endif 569 #endif 570 571 /* This provides the non-ANSI (far) memory allocation routines. */ 572 #if defined(__TURBOC__) && defined(__MSDOS__) 573 # include <mem.h> 574 # include <alloc.h> 575 #endif 576 577 #if defined(_WIN32) || defined(__WIN32__) || defined(__NT__) 578 # include <windows.h> 579 #endif 580 #endif /* PNG_VERSION_INFO_ONLY */ 581 582 /* Moved here around 1.5.0beta36 from pngconf.h */ 583 /* Users may want to use these so they are not private. Any library 584 * functions that are passed far data must be model-independent. 585 */ 586 587 /* Platform-independent functions */ 588 #ifndef PNG_ABORT 589 # define PNG_ABORT() abort() 590 #endif 591 592 /* These macros may need to be architecture dependent. */ 593 #define PNG_ALIGN_NONE 0 /* do not use data alignment */ 594 #define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */ 595 #ifdef offsetof 596 # define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */ 597 #else 598 # define PNG_ALIGN_OFFSET -1 /* prevent the use of this */ 599 #endif 600 #define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */ 601 602 #ifndef PNG_ALIGN_TYPE 603 /* Default to using aligned access optimizations and requiring alignment to a 604 * multiple of the data type size. Override in a compiler specific fashion 605 * if necessary by inserting tests here: 606 */ 607 # define PNG_ALIGN_TYPE PNG_ALIGN_SIZE 608 #endif 609 610 #if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE 611 /* This is used because in some compiler implementations non-aligned 612 * structure members are supported, so the offsetof approach below fails. 613 * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access 614 * is good for performance. Do not do this unless you have tested the 615 * result and understand it. 616 */ 617 # define png_alignof(type) (sizeof(type)) 618 #else 619 # if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET 620 # define png_alignof(type) offsetof(struct{char c; type t;}, t) 621 # else 622 # if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS 623 # define png_alignof(type) 1 624 # endif 625 /* Else leave png_alignof undefined to prevent use thereof */ 626 # endif 627 #endif 628 629 /* This implicitly assumes alignment is always a multiple of 2. */ 630 #ifdef png_alignof 631 # define png_isaligned(ptr, type) \ 632 (((type)(size_t)((const void*)(ptr)) & (type)(png_alignof(type)-1)) == 0) 633 #else 634 # define png_isaligned(ptr, type) 0 635 #endif 636 637 /* End of memory model/platform independent support */ 638 /* End of 1.5.0beta36 move from pngconf.h */ 639 640 /* CONSTANTS and UTILITY MACROS 641 * These are used internally by libpng and not exposed in the API 642 */ 643 644 /* Various modes of operation. Note that after an init, mode is set to 645 * zero automatically when the structure is created. Three of these 646 * are defined in png.h because they need to be visible to applications 647 * that call png_set_unknown_chunk(). 648 */ 649 /* #define PNG_HAVE_IHDR 0x01U (defined in png.h) */ 650 /* #define PNG_HAVE_PLTE 0x02U (defined in png.h) */ 651 #define PNG_HAVE_IDAT 0x04U 652 /* #define PNG_AFTER_IDAT 0x08U (defined in png.h) */ 653 #define PNG_HAVE_IEND 0x10U 654 /* 0x20U (unused) */ 655 /* 0x40U (unused) */ 656 /* 0x80U (unused) */ 657 #define PNG_HAVE_CHUNK_HEADER 0x100U 658 #define PNG_WROTE_tIME 0x200U 659 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400U 660 #define PNG_BACKGROUND_IS_GRAY 0x800U 661 #define PNG_HAVE_PNG_SIGNATURE 0x1000U 662 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000U /* Have another chunk after IDAT */ 663 #define PNG_WROTE_eXIf 0x4000U 664 #define PNG_IS_READ_STRUCT 0x8000U /* Else is a write struct */ 665 666 /* Flags for the transformations the PNG library does on the image data */ 667 #define PNG_BGR 0x0001U 668 #define PNG_INTERLACE 0x0002U 669 #define PNG_PACK 0x0004U 670 #define PNG_SHIFT 0x0008U 671 #define PNG_SWAP_BYTES 0x0010U 672 #define PNG_INVERT_MONO 0x0020U 673 #define PNG_QUANTIZE 0x0040U 674 #define PNG_COMPOSE 0x0080U /* Was PNG_BACKGROUND */ 675 #define PNG_BACKGROUND_EXPAND 0x0100U 676 #define PNG_EXPAND_16 0x0200U /* Added to libpng 1.5.2 */ 677 #define PNG_16_TO_8 0x0400U /* Becomes 'chop' in 1.5.4 */ 678 #define PNG_RGBA 0x0800U 679 #define PNG_EXPAND 0x1000U 680 #define PNG_GAMMA 0x2000U 681 #define PNG_GRAY_TO_RGB 0x4000U 682 #define PNG_FILLER 0x8000U 683 #define PNG_PACKSWAP 0x10000U 684 #define PNG_SWAP_ALPHA 0x20000U 685 #define PNG_STRIP_ALPHA 0x40000U 686 #define PNG_INVERT_ALPHA 0x80000U 687 #define PNG_USER_TRANSFORM 0x100000U 688 #define PNG_RGB_TO_GRAY_ERR 0x200000U 689 #define PNG_RGB_TO_GRAY_WARN 0x400000U 690 #define PNG_RGB_TO_GRAY 0x600000U /* two bits, RGB_TO_GRAY_ERR|WARN */ 691 #define PNG_ENCODE_ALPHA 0x800000U /* Added to libpng-1.5.4 */ 692 #define PNG_ADD_ALPHA 0x1000000U /* Added to libpng-1.2.7 */ 693 #define PNG_EXPAND_tRNS 0x2000000U /* Added to libpng-1.2.9 */ 694 #define PNG_SCALE_16_TO_8 0x4000000U /* Added to libpng-1.5.4 */ 695 /* 0x8000000U unused */ 696 /* 0x10000000U unused */ 697 /* 0x20000000U unused */ 698 /* 0x40000000U unused */ 699 /* Flags for png_create_struct */ 700 #define PNG_STRUCT_PNG 0x0001U 701 #define PNG_STRUCT_INFO 0x0002U 702 703 /* Flags for the png_ptr->flags rather than declaring a byte for each one */ 704 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001U 705 #define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002U /* Added to libpng-1.6.0 */ 706 /* 0x0004U unused */ 707 #define PNG_FLAG_ZSTREAM_ENDED 0x0008U /* Added to libpng-1.6.0 */ 708 /* 0x0010U unused */ 709 /* 0x0020U unused */ 710 #define PNG_FLAG_ROW_INIT 0x0040U 711 #define PNG_FLAG_FILLER_AFTER 0x0080U 712 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100U 713 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200U 714 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400U 715 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800U 716 #define PNG_FLAG_ASSUME_sRGB 0x1000U /* Added to libpng-1.5.4 */ 717 #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000U /* Added to libpng-1.5.4 */ 718 #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000U /* Added to libpng-1.5.4 */ 719 /* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000U */ 720 /* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000U */ 721 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000U 722 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000U 723 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000U 724 #define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000U /* Added to libpng-1.4.0 */ 725 #define PNG_FLAG_APP_WARNINGS_WARN 0x200000U /* Added to libpng-1.6.0 */ 726 #define PNG_FLAG_APP_ERRORS_WARN 0x400000U /* Added to libpng-1.6.0 */ 727 /* 0x800000U unused */ 728 /* 0x1000000U unused */ 729 /* 0x2000000U unused */ 730 /* 0x4000000U unused */ 731 /* 0x8000000U unused */ 732 /* 0x10000000U unused */ 733 /* 0x20000000U unused */ 734 /* 0x40000000U unused */ 735 736 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 737 PNG_FLAG_CRC_ANCILLARY_NOWARN) 738 739 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 740 PNG_FLAG_CRC_CRITICAL_IGNORE) 741 742 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 743 PNG_FLAG_CRC_CRITICAL_MASK) 744 745 /* Save typing and make code easier to understand */ 746 747 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 748 abs((int)((c1).green) - (int)((c2).green)) + \ 749 abs((int)((c1).blue) - (int)((c2).blue))) 750 751 /* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255 752 * by dividing by 257 *with rounding*. This macro is exact for the given range. 753 * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the 754 * macro were established by experiment (modifying the added value). The macro 755 * has a second variant that takes a value already scaled by 255 and divides by 756 * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it 757 * only gives off-by-one errors and only for 0.5% (1 in 200) of the values. 758 */ 759 #define PNG_DIV65535(v24) (((v24) + 32895) >> 16) 760 #define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255) 761 762 /* Added to libpng-1.2.6 JB */ 763 #define PNG_ROWBYTES(pixel_bits, width) \ 764 ((pixel_bits) >= 8 ? \ 765 ((size_t)(width) * (((size_t)(pixel_bits)) >> 3)) : \ 766 (( ((size_t)(width) * ((size_t)(pixel_bits))) + 7) >> 3) ) 767 768 /* This returns the number of trailing bits in the last byte of a row, 0 if the 769 * last byte is completely full of pixels. It is, in principle, (pixel_bits x 770 * width) % 8, but that would overflow for large 'width'. The second macro is 771 * the same except that it returns the number of unused bits in the last byte; 772 * (8-TRAILBITS), but 0 when TRAILBITS is 0. 773 * 774 * NOTE: these macros are intended to be self-evidently correct and never 775 * overflow on the assumption that pixel_bits is in the range 0..255. The 776 * arguments are evaluated only once and they can be signed (e.g. as a result of 777 * the integral promotions). The result of the expression always has type 778 * (png_uint_32), however the compiler always knows it is in the range 0..7. 779 */ 780 #define PNG_TRAILBITS(pixel_bits, width) \ 781 (((pixel_bits) * ((width) % (png_uint_32)8)) % 8) 782 783 #define PNG_PADBITS(pixel_bits, width) \ 784 ((8 - PNG_TRAILBITS(pixel_bits, width)) % 8) 785 786 /* PNG_OUT_OF_RANGE returns true if value is outside the range 787 * ideal-delta..ideal+delta. Each argument is evaluated twice. 788 * "ideal" and "delta" should be constants, normally simple 789 * integers, "value" a variable. Added to libpng-1.2.6 JB 790 */ 791 #define PNG_OUT_OF_RANGE(value, ideal, delta) \ 792 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 793 794 /* Conversions between fixed and floating point, only defined if 795 * required (to make sure the code doesn't accidentally use float 796 * when it is supposedly disabled.) 797 */ 798 #ifdef PNG_FLOATING_POINT_SUPPORTED 799 /* The floating point conversion can't overflow, though it can and 800 * does lose accuracy relative to the original fixed point value. 801 * In practice this doesn't matter because png_fixed_point only 802 * stores numbers with very low precision. The png_ptr and s 803 * arguments are unused by default but are there in case error 804 * checking becomes a requirement. 805 */ 806 #define png_float(png_ptr, fixed, s) (.00001 * (fixed)) 807 808 /* The fixed point conversion performs range checking and evaluates 809 * its argument multiple times, so must be used with care. The 810 * range checking uses the PNG specification values for a signed 811 * 32-bit fixed point value except that the values are deliberately 812 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly 813 * (2^31-1) * 100000). 's' is a string that describes the value being 814 * converted. 815 * 816 * NOTE: this macro will raise a png_error if the range check fails, 817 * therefore it is normally only appropriate to use this on values 818 * that come from API calls or other sources where an out of range 819 * error indicates a programming error, not a data error! 820 * 821 * NOTE: by default this is off - the macro is not used - because the 822 * function call saves a lot of code. 823 */ 824 #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED 825 #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\ 826 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0)) 827 #endif 828 /* else the corresponding function is defined below, inside the scope of the 829 * cplusplus test. 830 */ 831 #endif 832 833 /* Constants for known chunk types. If you need to add a chunk, define the name 834 * here. For historical reasons these constants have the form png_<name>; i.e. 835 * the prefix is lower case. Please use decimal values as the parameters to 836 * match the ISO PNG specification and to avoid relying on the C locale 837 * interpretation of character values. 838 * 839 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values 840 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string 841 * to be generated if required. 842 * 843 * PNG_32b correctly produces a value shifted by up to 24 bits, even on 844 * architectures where (int) is only 16 bits. 845 */ 846 #define PNG_32b(b,s) ((png_uint_32)(b) << (s)) 847 #define PNG_U32(b1,b2,b3,b4) \ 848 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0)) 849 850 /* Constants for known chunk types. 851 * 852 * MAINTAINERS: If you need to add a chunk, define the name here. 853 * For historical reasons these constants have the form png_<name>; i.e. 854 * the prefix is lower case. Please use decimal values as the parameters to 855 * match the ISO PNG specification and to avoid relying on the C locale 856 * interpretation of character values. Please keep the list sorted. 857 * 858 * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk 859 * type. In fact the specification does not express chunk types this way, 860 * however using a 32-bit value means that the chunk type can be read from the 861 * stream using exactly the same code as used for a 32-bit unsigned value and 862 * can be examined far more efficiently (using one arithmetic compare). 863 * 864 * Prior to 1.5.6 the chunk type constants were expressed as C strings. The 865 * libpng API still uses strings for 'unknown' chunks and a macro, 866 * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice 867 * that for portable code numeric values must still be used; the string "IHDR" 868 * is not portable and neither is PNG_U32('I', 'H', 'D', 'R'). 869 * 870 * In 1.7.0 the definitions will be made public in png.h to avoid having to 871 * duplicate the same definitions in application code. 872 */ 873 #define png_IDAT PNG_U32( 73, 68, 65, 84) 874 #define png_IEND PNG_U32( 73, 69, 78, 68) 875 #define png_IHDR PNG_U32( 73, 72, 68, 82) 876 #define png_PLTE PNG_U32( 80, 76, 84, 69) 877 #define png_bKGD PNG_U32( 98, 75, 71, 68) 878 #define png_cHRM PNG_U32( 99, 72, 82, 77) 879 #define png_eXIf PNG_U32(101, 88, 73, 102) /* registered July 2017 */ 880 #define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */ 881 #define png_gAMA PNG_U32(103, 65, 77, 65) 882 #define png_gIFg PNG_U32(103, 73, 70, 103) 883 #define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */ 884 #define png_gIFx PNG_U32(103, 73, 70, 120) 885 #define png_hIST PNG_U32(104, 73, 83, 84) 886 #define png_iCCP PNG_U32(105, 67, 67, 80) 887 #define png_iTXt PNG_U32(105, 84, 88, 116) 888 #define png_oFFs PNG_U32(111, 70, 70, 115) 889 #define png_pCAL PNG_U32(112, 67, 65, 76) 890 #define png_pHYs PNG_U32(112, 72, 89, 115) 891 #define png_sBIT PNG_U32(115, 66, 73, 84) 892 #define png_sCAL PNG_U32(115, 67, 65, 76) 893 #define png_sPLT PNG_U32(115, 80, 76, 84) 894 #define png_sRGB PNG_U32(115, 82, 71, 66) 895 #define png_sTER PNG_U32(115, 84, 69, 82) 896 #define png_tEXt PNG_U32(116, 69, 88, 116) 897 #define png_tIME PNG_U32(116, 73, 77, 69) 898 #define png_tRNS PNG_U32(116, 82, 78, 83) 899 #define png_zTXt PNG_U32(122, 84, 88, 116) 900 901 /* The following will work on (signed char*) strings, whereas the get_uint_32 902 * macro will fail on top-bit-set values because of the sign extension. 903 */ 904 #define PNG_CHUNK_FROM_STRING(s)\ 905 PNG_U32(0xff & (s)[0], 0xff & (s)[1], 0xff & (s)[2], 0xff & (s)[3]) 906 907 /* This uses (char), not (png_byte) to avoid warnings on systems where (char) is 908 * signed and the argument is a (char[]) This macro will fail miserably on 909 * systems where (char) is more than 8 bits. 910 */ 911 #define PNG_STRING_FROM_CHUNK(s,c)\ 912 (void)(((char*)(s))[0]=(char)(((c)>>24) & 0xff), \ 913 ((char*)(s))[1]=(char)(((c)>>16) & 0xff),\ 914 ((char*)(s))[2]=(char)(((c)>>8) & 0xff), \ 915 ((char*)(s))[3]=(char)((c & 0xff))) 916 917 /* Do the same but terminate with a null character. */ 918 #define PNG_CSTRING_FROM_CHUNK(s,c)\ 919 (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0) 920 921 /* Test on flag values as defined in the spec (section 5.4): */ 922 #define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29)) 923 #define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c)) 924 #define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21)) 925 #define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13)) 926 #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5)) 927 928 /* Gamma values (new at libpng-1.5.4): */ 929 #define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */ 930 #define PNG_GAMMA_MAC_INVERSE 65909 931 #define PNG_GAMMA_sRGB_INVERSE 45455 932 933 /* Almost everything below is C specific; the #defines above can be used in 934 * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot. 935 */ 936 #ifndef PNG_VERSION_INFO_ONLY 937 938 #include "pngstruct.h" 939 #include "pnginfo.h" 940 941 /* Validate the include paths - the include path used to generate pnglibconf.h 942 * must match that used in the build, or we must be using pnglibconf.h.prebuilt: 943 */ 944 #if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM 945 # error ZLIB_VERNUM != PNG_ZLIB_VERNUM \ 946 "-I (include path) error: see the notes in pngpriv.h" 947 /* This means that when pnglibconf.h was built the copy of zlib.h that it 948 * used is not the same as the one being used here. Because the build of 949 * libpng makes decisions to use inflateInit2 and inflateReset2 based on the 950 * zlib version number and because this affects handling of certain broken 951 * PNG files the -I directives must match. 952 * 953 * The most likely explanation is that you passed a -I in CFLAGS. This will 954 * not work; all the preprocessor directives and in particular all the -I 955 * directives must be in CPPFLAGS. 956 */ 957 #endif 958 959 /* This is used for 16-bit gamma tables -- only the top level pointers are 960 * const; this could be changed: 961 */ 962 typedef const png_uint_16p * png_const_uint_16pp; 963 964 /* Added to libpng-1.5.7: sRGB conversion tables */ 965 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 966 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 967 #ifdef PNG_SIMPLIFIED_READ_SUPPORTED 968 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]); 969 /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value, 970 * 0..65535. This table gives the closest 16-bit answers (no errors). 971 */ 972 #endif 973 974 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]); 975 PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]); 976 977 #define PNG_sRGB_FROM_LINEAR(linear) \ 978 ((png_byte)(0xff & ((png_sRGB_base[(linear)>>15] \ 979 + ((((linear) & 0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8))) 980 /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB 981 * encoded value with maximum error 0.646365. Note that the input is not a 982 * 16-bit value; it has been multiplied by 255! */ 983 #endif /* SIMPLIFIED_READ/WRITE */ 984 985 986 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 987 #ifdef __cplusplus 988 extern "C" { 989 #endif /* __cplusplus */ 990 991 /* Internal functions; these are not exported from a DLL however because they 992 * are used within several of the C source files they have to be C extern. 993 * 994 * All of these functions must be declared with PNG_INTERNAL_FUNCTION. 995 */ 996 997 /* Zlib support */ 998 #define PNG_UNEXPECTED_ZLIB_RETURN (-7) 999 PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret), 1000 PNG_EMPTY); 1001 /* Used by the zlib handling functions to ensure that z_stream::msg is always 1002 * set before they return. 1003 */ 1004 1005 #ifdef PNG_WRITE_SUPPORTED 1006 PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr, 1007 png_compression_bufferp *list),PNG_EMPTY); 1008 /* Free the buffer list used by the compressed write code. */ 1009 #endif 1010 1011 #if defined(PNG_FLOATING_POINT_SUPPORTED) && \ 1012 !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \ 1013 (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \ 1014 defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \ 1015 defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \ 1016 (defined(PNG_sCAL_SUPPORTED) && \ 1017 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)) 1018 PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr, 1019 double fp, png_const_charp text),PNG_EMPTY); 1020 #endif 1021 1022 /* Check the user version string for compatibility, returns false if the version 1023 * numbers aren't compatible. 1024 */ 1025 PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr, 1026 png_const_charp user_png_ver),PNG_EMPTY); 1027 1028 /* Internal base allocator - no messages, NULL on failure to allocate. This 1029 * does, however, call the application provided allocator and that could call 1030 * png_error (although that would be a bug in the application implementation.) 1031 */ 1032 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr, 1033 png_alloc_size_t size),PNG_ALLOCATED); 1034 1035 #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\ 1036 defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED) 1037 /* Internal array allocator, outputs no error or warning messages on failure, 1038 * just returns NULL. 1039 */ 1040 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr, 1041 int nelements, size_t element_size),PNG_ALLOCATED); 1042 1043 /* The same but an existing array is extended by add_elements. This function 1044 * also memsets the new elements to 0 and copies the old elements. The old 1045 * array is not freed or altered. 1046 */ 1047 PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr, 1048 png_const_voidp array, int old_elements, int add_elements, 1049 size_t element_size),PNG_ALLOCATED); 1050 #endif /* text, sPLT or unknown chunks */ 1051 1052 /* Magic to create a struct when there is no struct to call the user supplied 1053 * memory allocators. Because error handling has not been set up the memory 1054 * handlers can't safely call png_error, but this is an obscure and undocumented 1055 * restriction so libpng has to assume that the 'free' handler, at least, might 1056 * call png_error. 1057 */ 1058 PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct, 1059 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, 1060 png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, 1061 png_free_ptr free_fn),PNG_ALLOCATED); 1062 1063 /* Free memory from internal libpng struct */ 1064 PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr), 1065 PNG_EMPTY); 1066 1067 /* Free an allocated jmp_buf (always succeeds) */ 1068 PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY); 1069 1070 /* Function to allocate memory for zlib. PNGAPI is disallowed. */ 1071 PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size), 1072 PNG_ALLOCATED); 1073 1074 /* Function to free memory for zlib. PNGAPI is disallowed. */ 1075 PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY); 1076 1077 /* Next four functions are used internally as callbacks. PNGCBAPI is required 1078 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to 1079 * PNGCBAPI at 1.5.0 1080 */ 1081 1082 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr, 1083 png_bytep data, size_t length),PNG_EMPTY); 1084 1085 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1086 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr, 1087 png_bytep buffer, size_t length),PNG_EMPTY); 1088 #endif 1089 1090 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr, 1091 png_bytep data, size_t length),PNG_EMPTY); 1092 1093 #ifdef PNG_WRITE_FLUSH_SUPPORTED 1094 # ifdef PNG_STDIO_SUPPORTED 1095 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr), 1096 PNG_EMPTY); 1097 # endif 1098 #endif 1099 1100 /* Reset the CRC variable */ 1101 PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY); 1102 1103 /* Write the "data" buffer to whatever output you are using */ 1104 PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr, 1105 png_const_bytep data, size_t length),PNG_EMPTY); 1106 1107 /* Read and check the PNG file signature */ 1108 PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr, 1109 png_inforp info_ptr),PNG_EMPTY); 1110 1111 /* Read the chunk header (length + type name) */ 1112 PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr), 1113 PNG_EMPTY); 1114 1115 /* Read data from whatever input you are using into the "data" buffer */ 1116 PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data, 1117 size_t length),PNG_EMPTY); 1118 1119 /* Read bytes into buf, and update png_ptr->crc */ 1120 PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf, 1121 png_uint_32 length),PNG_EMPTY); 1122 1123 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 1124 PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr, 1125 png_uint_32 skip),PNG_EMPTY); 1126 1127 /* Read the CRC from the file and compare it to the libpng calculated CRC */ 1128 PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY); 1129 1130 /* Calculate the CRC over a section of data. Note that we are only 1131 * passing a maximum of 64K on systems that have this as a memory limit, 1132 * since this is the maximum buffer size we can specify. 1133 */ 1134 PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr, 1135 png_const_bytep ptr, size_t length),PNG_EMPTY); 1136 1137 #ifdef PNG_WRITE_FLUSH_SUPPORTED 1138 PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY); 1139 #endif 1140 1141 /* Write various chunks */ 1142 1143 /* Write the IHDR chunk, and update the png_struct with the necessary 1144 * information. 1145 */ 1146 PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr, 1147 png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, 1148 int compression_method, int filter_method, int interlace_method),PNG_EMPTY); 1149 1150 PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr, 1151 png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY); 1152 1153 PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr, 1154 png_const_bytep row_data, png_alloc_size_t row_data_length, int flush), 1155 PNG_EMPTY); 1156 1157 PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY); 1158 1159 #ifdef PNG_WRITE_gAMA_SUPPORTED 1160 PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr, 1161 png_fixed_point file_gamma),PNG_EMPTY); 1162 #endif 1163 1164 #ifdef PNG_WRITE_sBIT_SUPPORTED 1165 PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr, 1166 png_const_color_8p sbit, int color_type),PNG_EMPTY); 1167 #endif 1168 1169 #ifdef PNG_WRITE_cHRM_SUPPORTED 1170 PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr, 1171 const png_xy *xy), PNG_EMPTY); 1172 /* The xy value must have been previously validated */ 1173 #endif 1174 1175 #ifdef PNG_WRITE_sRGB_SUPPORTED 1176 PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr, 1177 int intent),PNG_EMPTY); 1178 #endif 1179 1180 #ifdef PNG_WRITE_eXIf_SUPPORTED 1181 PNG_INTERNAL_FUNCTION(void,png_write_eXIf,(png_structrp png_ptr, 1182 png_bytep exif, int num_exif),PNG_EMPTY); 1183 #endif 1184 1185 #ifdef PNG_WRITE_iCCP_SUPPORTED 1186 PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr, 1187 png_const_charp name, png_const_bytep profile), PNG_EMPTY); 1188 /* The profile must have been previously validated for correctness, the 1189 * length comes from the first four bytes. Only the base, deflate, 1190 * compression is supported. 1191 */ 1192 #endif 1193 1194 #ifdef PNG_WRITE_sPLT_SUPPORTED 1195 PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr, 1196 png_const_sPLT_tp palette),PNG_EMPTY); 1197 #endif 1198 1199 #ifdef PNG_WRITE_tRNS_SUPPORTED 1200 PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr, 1201 png_const_bytep trans, png_const_color_16p values, int number, 1202 int color_type),PNG_EMPTY); 1203 #endif 1204 1205 #ifdef PNG_WRITE_bKGD_SUPPORTED 1206 PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr, 1207 png_const_color_16p values, int color_type),PNG_EMPTY); 1208 #endif 1209 1210 #ifdef PNG_WRITE_hIST_SUPPORTED 1211 PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr, 1212 png_const_uint_16p hist, int num_hist),PNG_EMPTY); 1213 #endif 1214 1215 /* Chunks that have keywords */ 1216 #ifdef PNG_WRITE_tEXt_SUPPORTED 1217 PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr, 1218 png_const_charp key, png_const_charp text, size_t text_len),PNG_EMPTY); 1219 #endif 1220 1221 #ifdef PNG_WRITE_zTXt_SUPPORTED 1222 PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp 1223 key, png_const_charp text, int compression),PNG_EMPTY); 1224 #endif 1225 1226 #ifdef PNG_WRITE_iTXt_SUPPORTED 1227 PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr, 1228 int compression, png_const_charp key, png_const_charp lang, 1229 png_const_charp lang_key, png_const_charp text),PNG_EMPTY); 1230 #endif 1231 1232 #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ 1233 PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr, 1234 png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY); 1235 #endif 1236 1237 #ifdef PNG_WRITE_oFFs_SUPPORTED 1238 PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr, 1239 png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY); 1240 #endif 1241 1242 #ifdef PNG_WRITE_pCAL_SUPPORTED 1243 PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr, 1244 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, 1245 png_const_charp units, png_charpp params),PNG_EMPTY); 1246 #endif 1247 1248 #ifdef PNG_WRITE_pHYs_SUPPORTED 1249 PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr, 1250 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 1251 int unit_type),PNG_EMPTY); 1252 #endif 1253 1254 #ifdef PNG_WRITE_tIME_SUPPORTED 1255 PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr, 1256 png_const_timep mod_time),PNG_EMPTY); 1257 #endif 1258 1259 #ifdef PNG_WRITE_sCAL_SUPPORTED 1260 PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr, 1261 int unit, png_const_charp width, png_const_charp height),PNG_EMPTY); 1262 #endif 1263 1264 /* Called when finished processing a row of data */ 1265 PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr), 1266 PNG_EMPTY); 1267 1268 /* Internal use only. Called before first row of data */ 1269 PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr), 1270 PNG_EMPTY); 1271 1272 /* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an 1273 * array of png_ptr->width pixels. If the image is not interlaced or this 1274 * is the final pass this just does a memcpy, otherwise the "display" flag 1275 * is used to determine whether to copy pixels that are not in the current pass. 1276 * 1277 * Because 'png_do_read_interlace' (below) replicates pixels this allows this 1278 * function to achieve the documented 'blocky' appearance during interlaced read 1279 * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row' 1280 * are not changed if they are not in the current pass, when display is 0. 1281 * 1282 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless. 1283 * 1284 * The API always reads from the png_struct row buffer and always assumes that 1285 * it is full width (png_do_read_interlace has already been called.) 1286 * 1287 * This function is only ever used to write to row buffers provided by the 1288 * caller of the relevant libpng API and the row must have already been 1289 * transformed by the read transformations. 1290 * 1291 * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed 1292 * bitmasks for use within the code, otherwise runtime generated masks are used. 1293 * The default is compile time masks. 1294 */ 1295 #ifndef PNG_USE_COMPILE_TIME_MASKS 1296 # define PNG_USE_COMPILE_TIME_MASKS 1 1297 #endif 1298 PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr, 1299 png_bytep row, int display),PNG_EMPTY); 1300 1301 #ifdef PNG_READ_INTERLACING_SUPPORTED 1302 /* Expand an interlaced row: the 'row_info' describes the pass data that has 1303 * been read in and must correspond to the pixels in 'row', the pixels are 1304 * expanded (moved apart) in 'row' to match the final layout, when doing this 1305 * the pixels are *replicated* to the intervening space. This is essential for 1306 * the correct operation of png_combine_row, above. 1307 */ 1308 PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info, 1309 png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY); 1310 #endif 1311 1312 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 1313 1314 #ifdef PNG_WRITE_INTERLACING_SUPPORTED 1315 /* Grab pixels out of a row for an interlaced pass */ 1316 PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info, 1317 png_bytep row, int pass),PNG_EMPTY); 1318 #endif 1319 1320 /* Unfilter a row: check the filter value before calling this, there is no point 1321 * calling it for PNG_FILTER_VALUE_NONE. 1322 */ 1323 PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop 1324 row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY); 1325 1326 #if PNG_ARM_NEON_OPT > 0 1327 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(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_neon,(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_neon,(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_neon,(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_neon,(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_neon,(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_neon,(png_row_infop 1340 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1341 #endif 1342 1343 #if PNG_MIPS_MSA_IMPLEMENTATION == 1 1344 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_msa,(png_row_infop row_info, 1345 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1346 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_msa,(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_sub4_msa,(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_avg3_msa,(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_avg4_msa,(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_paeth3_msa,(png_row_infop 1355 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1356 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_msa,(png_row_infop 1357 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1358 #endif 1359 1360 #if PNG_MIPS_MMI_IMPLEMENTATION > 0 1361 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_mmi,(png_row_infop row_info, 1362 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1363 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_mmi,(png_row_infop 1364 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1365 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_mmi,(png_row_infop 1366 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1367 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_mmi,(png_row_infop 1368 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1369 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_mmi,(png_row_infop 1370 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1371 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_mmi,(png_row_infop 1372 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1373 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_mmi,(png_row_infop 1374 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1375 #endif 1376 1377 #if PNG_POWERPC_VSX_OPT > 0 1378 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_vsx,(png_row_infop row_info, 1379 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1380 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_vsx,(png_row_infop 1381 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1382 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_vsx,(png_row_infop 1383 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1384 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_vsx,(png_row_infop 1385 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1386 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_vsx,(png_row_infop 1387 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1388 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_vsx,(png_row_infop 1389 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1390 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_vsx,(png_row_infop 1391 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1392 #endif 1393 1394 #if PNG_INTEL_SSE_IMPLEMENTATION > 0 1395 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_sse2,(png_row_infop 1396 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1397 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_sse2,(png_row_infop 1398 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1399 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_sse2,(png_row_infop 1400 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1401 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_sse2,(png_row_infop 1402 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1403 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_sse2,(png_row_infop 1404 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1405 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_sse2,(png_row_infop 1406 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1407 #endif 1408 1409 #if PNG_LOONGARCH_LSX_IMPLEMENTATION == 1 1410 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_lsx,(png_row_infop 1411 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1412 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_lsx,(png_row_infop 1413 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1414 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_lsx,(png_row_infop 1415 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1416 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_lsx,(png_row_infop 1417 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1418 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_lsx,(png_row_infop 1419 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1420 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_lsx,(png_row_infop 1421 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1422 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_lsx,(png_row_infop 1423 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1424 #endif 1425 1426 /* Choose the best filter to use and filter the row data */ 1427 PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr, 1428 png_row_infop row_info),PNG_EMPTY); 1429 1430 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED 1431 PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr, 1432 png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY); 1433 /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer 1434 * is NULL the function checks, instead, for the end of the stream. In this 1435 * case a benign error will be issued if the stream end is not found or if 1436 * extra data has to be consumed. 1437 */ 1438 PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr), 1439 PNG_EMPTY); 1440 /* This cleans up when the IDAT LZ stream does not end when the last image 1441 * byte is read; there is still some pending input. 1442 */ 1443 1444 PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr), 1445 PNG_EMPTY); 1446 /* Finish a row while reading, dealing with interlacing passes, etc. */ 1447 #endif /* SEQUENTIAL_READ */ 1448 1449 /* Initialize the row buffers, etc. */ 1450 PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY); 1451 1452 #if ZLIB_VERNUM >= 0x1240 1453 PNG_INTERNAL_FUNCTION(int,png_zlib_inflate,(png_structrp png_ptr, int flush), 1454 PNG_EMPTY); 1455 # define PNG_INFLATE(pp, flush) png_zlib_inflate(pp, flush) 1456 #else /* Zlib < 1.2.4 */ 1457 # define PNG_INFLATE(pp, flush) inflate(&(pp)->zstream, flush) 1458 #endif /* Zlib < 1.2.4 */ 1459 1460 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1461 /* Optional call to update the users info structure */ 1462 PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr, 1463 png_inforp info_ptr),PNG_EMPTY); 1464 #endif 1465 1466 /* Shared transform functions, defined in pngtran.c */ 1467 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 1468 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 1469 PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info, 1470 png_bytep row, int at_start),PNG_EMPTY); 1471 #endif 1472 1473 #ifdef PNG_16BIT_SUPPORTED 1474 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 1475 PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info, 1476 png_bytep row),PNG_EMPTY); 1477 #endif 1478 #endif 1479 1480 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ 1481 defined(PNG_WRITE_PACKSWAP_SUPPORTED) 1482 PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info, 1483 png_bytep row),PNG_EMPTY); 1484 #endif 1485 1486 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 1487 PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info, 1488 png_bytep row),PNG_EMPTY); 1489 #endif 1490 1491 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1492 PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info, 1493 png_bytep row),PNG_EMPTY); 1494 #endif 1495 1496 /* The following decodes the appropriate chunks, and does error correction, 1497 * then calls the appropriate callback for the chunk if it is valid. 1498 */ 1499 1500 /* Decode the IHDR chunk */ 1501 PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr, 1502 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1503 PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr, 1504 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1505 PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr, 1506 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1507 1508 #ifdef PNG_READ_bKGD_SUPPORTED 1509 PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr, 1510 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1511 #endif 1512 1513 #ifdef PNG_READ_cHRM_SUPPORTED 1514 PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr, 1515 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1516 #endif 1517 1518 #ifdef PNG_READ_eXIf_SUPPORTED 1519 PNG_INTERNAL_FUNCTION(void,png_handle_eXIf,(png_structrp png_ptr, 1520 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1521 #endif 1522 1523 #ifdef PNG_READ_gAMA_SUPPORTED 1524 PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr, 1525 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1526 #endif 1527 1528 #ifdef PNG_READ_hIST_SUPPORTED 1529 PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr, 1530 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1531 #endif 1532 1533 #ifdef PNG_READ_iCCP_SUPPORTED 1534 PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr, 1535 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1536 #endif /* READ_iCCP */ 1537 1538 #ifdef PNG_READ_iTXt_SUPPORTED 1539 PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr, 1540 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1541 #endif 1542 1543 #ifdef PNG_READ_oFFs_SUPPORTED 1544 PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr, 1545 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1546 #endif 1547 1548 #ifdef PNG_READ_pCAL_SUPPORTED 1549 PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr, 1550 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1551 #endif 1552 1553 #ifdef PNG_READ_pHYs_SUPPORTED 1554 PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr, 1555 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1556 #endif 1557 1558 #ifdef PNG_READ_sBIT_SUPPORTED 1559 PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr, 1560 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1561 #endif 1562 1563 #ifdef PNG_READ_sCAL_SUPPORTED 1564 PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr, 1565 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1566 #endif 1567 1568 #ifdef PNG_READ_sPLT_SUPPORTED 1569 PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr, 1570 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1571 #endif /* READ_sPLT */ 1572 1573 #ifdef PNG_READ_sRGB_SUPPORTED 1574 PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr, 1575 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1576 #endif 1577 1578 #ifdef PNG_READ_tEXt_SUPPORTED 1579 PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr, 1580 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1581 #endif 1582 1583 #ifdef PNG_READ_tIME_SUPPORTED 1584 PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr, 1585 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1586 #endif 1587 1588 #ifdef PNG_READ_tRNS_SUPPORTED 1589 PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr, 1590 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1591 #endif 1592 1593 #ifdef PNG_READ_zTXt_SUPPORTED 1594 PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr, 1595 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1596 #endif 1597 1598 PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_const_structrp png_ptr, 1599 png_uint_32 chunk_name),PNG_EMPTY); 1600 1601 PNG_INTERNAL_FUNCTION(void,png_check_chunk_length,(png_const_structrp png_ptr, 1602 png_uint_32 chunk_length),PNG_EMPTY); 1603 1604 PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr, 1605 png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY); 1606 /* This is the function that gets called for unknown chunks. The 'keep' 1607 * argument is either non-zero for a known chunk that has been set to be 1608 * handled as unknown or zero for an unknown chunk. By default the function 1609 * just skips the chunk or errors out if it is critical. 1610 */ 1611 1612 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\ 1613 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 1614 PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling, 1615 (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY); 1616 /* Exactly as the API png_handle_as_unknown() except that the argument is a 1617 * 32-bit chunk name, not a string. 1618 */ 1619 #endif /* READ_UNKNOWN_CHUNKS || HANDLE_AS_UNKNOWN */ 1620 1621 /* Handle the transformations for reading and writing */ 1622 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1623 PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr, 1624 png_row_infop row_info),PNG_EMPTY); 1625 #endif 1626 #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED 1627 PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr, 1628 png_row_infop row_info),PNG_EMPTY); 1629 #endif 1630 1631 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1632 PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr), 1633 PNG_EMPTY); 1634 #endif 1635 1636 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1637 PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr, 1638 png_inforp info_ptr),PNG_EMPTY); 1639 PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr, 1640 png_inforp info_ptr),PNG_EMPTY); 1641 PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY); 1642 PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr), 1643 PNG_EMPTY); 1644 PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr, 1645 png_bytep buffer, size_t buffer_length),PNG_EMPTY); 1646 PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY); 1647 PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr, 1648 png_bytep buffer, size_t buffer_length),PNG_EMPTY); 1649 PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr), 1650 PNG_EMPTY); 1651 PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr, 1652 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1653 PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr, 1654 png_inforp info_ptr),PNG_EMPTY); 1655 PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr, 1656 png_inforp info_ptr),PNG_EMPTY); 1657 PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr, 1658 png_bytep row),PNG_EMPTY); 1659 PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr, 1660 png_inforp info_ptr),PNG_EMPTY); 1661 PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr, 1662 png_inforp info_ptr),PNG_EMPTY); 1663 PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr), 1664 PNG_EMPTY); 1665 # ifdef PNG_READ_tEXt_SUPPORTED 1666 PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr, 1667 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1668 PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr, 1669 png_inforp info_ptr),PNG_EMPTY); 1670 # endif 1671 # ifdef PNG_READ_zTXt_SUPPORTED 1672 PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr, 1673 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1674 PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr, 1675 png_inforp info_ptr),PNG_EMPTY); 1676 # endif 1677 # ifdef PNG_READ_iTXt_SUPPORTED 1678 PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr, 1679 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1680 PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr, 1681 png_inforp info_ptr),PNG_EMPTY); 1682 # endif 1683 1684 #endif /* PROGRESSIVE_READ */ 1685 1686 /* Added at libpng version 1.6.0 */ 1687 #ifdef PNG_GAMMA_SUPPORTED 1688 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr, 1689 png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY); 1690 /* Set the colorspace gamma with a value provided by the application or by 1691 * the gAMA chunk on read. The value will override anything set by an ICC 1692 * profile. 1693 */ 1694 1695 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr, 1696 png_inforp info_ptr), PNG_EMPTY); 1697 /* Synchronize the info 'valid' flags with the colorspace */ 1698 1699 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr, 1700 png_inforp info_ptr), PNG_EMPTY); 1701 /* Copy the png_struct colorspace to the info_struct and call the above to 1702 * synchronize the flags. Checks for NULL info_ptr and does nothing. 1703 */ 1704 #endif 1705 1706 /* Added at libpng version 1.4.0 */ 1707 #ifdef PNG_COLORSPACE_SUPPORTED 1708 /* These internal functions are for maintaining the colorspace structure within 1709 * a png_info or png_struct (or, indeed, both). 1710 */ 1711 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities, 1712 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy, 1713 int preferred), PNG_EMPTY); 1714 1715 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints, 1716 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ, 1717 int preferred), PNG_EMPTY); 1718 1719 #ifdef PNG_sRGB_SUPPORTED 1720 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr, 1721 png_colorspacerp colorspace, int intent), PNG_EMPTY); 1722 /* This does set the colorspace gAMA and cHRM values too, but doesn't set the 1723 * flags to write them, if it returns false there was a problem and an error 1724 * message has already been output (but the colorspace may still need to be 1725 * synced to record the invalid flag). 1726 */ 1727 #endif /* sRGB */ 1728 1729 #ifdef PNG_iCCP_SUPPORTED 1730 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr, 1731 png_colorspacerp colorspace, png_const_charp name, 1732 png_uint_32 profile_length, png_const_bytep profile, int color_type), 1733 PNG_EMPTY); 1734 /* The 'name' is used for information only */ 1735 1736 /* Routines for checking parts of an ICC profile. */ 1737 #ifdef PNG_READ_iCCP_SUPPORTED 1738 PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr, 1739 png_colorspacerp colorspace, png_const_charp name, 1740 png_uint_32 profile_length), PNG_EMPTY); 1741 #endif /* READ_iCCP */ 1742 PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr, 1743 png_colorspacerp colorspace, png_const_charp name, 1744 png_uint_32 profile_length, 1745 png_const_bytep profile /* first 132 bytes only */, int color_type), 1746 PNG_EMPTY); 1747 PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr, 1748 png_colorspacerp colorspace, png_const_charp name, 1749 png_uint_32 profile_length, 1750 png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY); 1751 #ifdef PNG_sRGB_SUPPORTED 1752 PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,( 1753 png_const_structrp png_ptr, png_colorspacerp colorspace, 1754 png_const_bytep profile, uLong adler), PNG_EMPTY); 1755 /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may 1756 * be zero to indicate that it is not available. It is used, if provided, 1757 * as a fast check on the profile when checking to see if it is sRGB. 1758 */ 1759 #endif 1760 #endif /* iCCP */ 1761 1762 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1763 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients, 1764 (png_structrp png_ptr), PNG_EMPTY); 1765 /* Set the rgb_to_gray coefficients from the colorspace Y values */ 1766 #endif /* READ_RGB_TO_GRAY */ 1767 #endif /* COLORSPACE */ 1768 1769 /* Added at libpng version 1.4.0 */ 1770 PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr, 1771 png_uint_32 width, png_uint_32 height, int bit_depth, 1772 int color_type, int interlace_type, int compression_type, 1773 int filter_type),PNG_EMPTY); 1774 1775 /* Added at libpng version 1.5.10 */ 1776 #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \ 1777 defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED) 1778 PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes, 1779 (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY); 1780 #endif 1781 1782 #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) 1783 PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr, 1784 png_const_charp name),PNG_NORETURN); 1785 #endif 1786 1787 /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite 1788 * the end. Always leaves the buffer nul terminated. Never errors out (and 1789 * there is no error code.) 1790 */ 1791 PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize, 1792 size_t pos, png_const_charp string),PNG_EMPTY); 1793 1794 /* Various internal functions to handle formatted warning messages, currently 1795 * only implemented for warnings. 1796 */ 1797 #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) 1798 /* Utility to dump an unsigned value into a buffer, given a start pointer and 1799 * and end pointer (which should point just *beyond* the end of the buffer!) 1800 * Returns the pointer to the start of the formatted string. This utility only 1801 * does unsigned values. 1802 */ 1803 PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start, 1804 png_charp end, int format, png_alloc_size_t number),PNG_EMPTY); 1805 1806 /* Convenience macro that takes an array: */ 1807 #define PNG_FORMAT_NUMBER(buffer,format,number) \ 1808 png_format_number(buffer, buffer + (sizeof buffer), format, number) 1809 1810 /* Suggested size for a number buffer (enough for 64 bits and a sign!) */ 1811 #define PNG_NUMBER_BUFFER_SIZE 24 1812 1813 /* These are the integer formats currently supported, the name is formed from 1814 * the standard printf(3) format string. 1815 */ 1816 #define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */ 1817 #define PNG_NUMBER_FORMAT_02u 2 1818 #define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */ 1819 #define PNG_NUMBER_FORMAT_02d 2 1820 #define PNG_NUMBER_FORMAT_x 3 1821 #define PNG_NUMBER_FORMAT_02x 4 1822 #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */ 1823 #endif 1824 1825 #ifdef PNG_WARNINGS_SUPPORTED 1826 /* New defines and members adding in libpng-1.5.4 */ 1827 # define PNG_WARNING_PARAMETER_SIZE 32 1828 # define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */ 1829 1830 /* An l-value of this type has to be passed to the APIs below to cache the 1831 * values of the parameters to a formatted warning message. 1832 */ 1833 typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][ 1834 PNG_WARNING_PARAMETER_SIZE]; 1835 1836 PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p, 1837 int number, png_const_charp string),PNG_EMPTY); 1838 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters, 1839 * including the trailing '\0'. 1840 */ 1841 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned, 1842 (png_warning_parameters p, int number, int format, png_alloc_size_t value), 1843 PNG_EMPTY); 1844 /* Use png_alloc_size_t because it is an unsigned type as big as any we 1845 * need to output. Use the following for a signed value. 1846 */ 1847 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed, 1848 (png_warning_parameters p, int number, int format, png_int_32 value), 1849 PNG_EMPTY); 1850 1851 PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr, 1852 png_warning_parameters p, png_const_charp message),PNG_EMPTY); 1853 /* 'message' follows the X/Open approach of using @1, @2 to insert 1854 * parameters previously supplied using the above functions. Errors in 1855 * specifying the parameters will simply result in garbage substitutions. 1856 */ 1857 #endif 1858 1859 #ifdef PNG_BENIGN_ERRORS_SUPPORTED 1860 /* Application errors (new in 1.6); use these functions (declared below) for 1861 * errors in the parameters or order of API function calls on read. The 1862 * 'warning' should be used for an error that can be handled completely; the 1863 * 'error' for one which can be handled safely but which may lose application 1864 * information or settings. 1865 * 1866 * By default these both result in a png_error call prior to release, while in a 1867 * released version the 'warning' is just a warning. However if the application 1868 * explicitly disables benign errors (explicitly permitting the code to lose 1869 * information) they both turn into warnings. 1870 * 1871 * If benign errors aren't supported they end up as the corresponding base call 1872 * (png_warning or png_error.) 1873 */ 1874 PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr, 1875 png_const_charp message),PNG_EMPTY); 1876 /* The application provided invalid parameters to an API function or called 1877 * an API function at the wrong time, libpng can completely recover. 1878 */ 1879 1880 PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr, 1881 png_const_charp message),PNG_EMPTY); 1882 /* As above but libpng will ignore the call, or attempt some other partial 1883 * recovery from the error. 1884 */ 1885 #else 1886 # define png_app_warning(pp,s) png_warning(pp,s) 1887 # define png_app_error(pp,s) png_error(pp,s) 1888 #endif 1889 1890 PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr, 1891 png_const_charp message, int error),PNG_EMPTY); 1892 /* Report a recoverable issue in chunk data. On read this is used to report 1893 * a problem found while reading a particular chunk and the 1894 * png_chunk_benign_error or png_chunk_warning function is used as 1895 * appropriate. On write this is used to report an error that comes from 1896 * data set via an application call to a png_set_ API and png_app_error or 1897 * png_app_warning is used as appropriate. 1898 * 1899 * The 'error' parameter must have one of the following values: 1900 */ 1901 #define PNG_CHUNK_WARNING 0 /* never an error */ 1902 #define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */ 1903 #define PNG_CHUNK_ERROR 2 /* always an error */ 1904 1905 /* ASCII to FP interfaces, currently only implemented if sCAL 1906 * support is required. 1907 */ 1908 #if defined(PNG_sCAL_SUPPORTED) 1909 /* MAX_DIGITS is actually the maximum number of characters in an sCAL 1910 * width or height, derived from the precision (number of significant 1911 * digits - a build time settable option) and assumptions about the 1912 * maximum ridiculous exponent. 1913 */ 1914 #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/) 1915 1916 #ifdef PNG_FLOATING_POINT_SUPPORTED 1917 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr, 1918 png_charp ascii, size_t size, double fp, unsigned int precision), 1919 PNG_EMPTY); 1920 #endif /* FLOATING_POINT */ 1921 1922 #ifdef PNG_FIXED_POINT_SUPPORTED 1923 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr, 1924 png_charp ascii, size_t size, png_fixed_point fp),PNG_EMPTY); 1925 #endif /* FIXED_POINT */ 1926 #endif /* sCAL */ 1927 1928 #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) 1929 /* An internal API to validate the format of a floating point number. 1930 * The result is the index of the next character. If the number is 1931 * not valid it will be the index of a character in the supposed number. 1932 * 1933 * The format of a number is defined in the PNG extensions specification 1934 * and this API is strictly conformant to that spec, not anyone elses! 1935 * 1936 * The format as a regular expression is: 1937 * 1938 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)? 1939 * 1940 * or: 1941 * 1942 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)? 1943 * 1944 * The complexity is that either integer or fraction must be present and the 1945 * fraction is permitted to have no digits only if the integer is present. 1946 * 1947 * NOTE: The dangling E problem. 1948 * There is a PNG valid floating point number in the following: 1949 * 1950 * PNG floating point numbers are not greedy. 1951 * 1952 * Working this out requires *TWO* character lookahead (because of the 1953 * sign), the parser does not do this - it will fail at the 'r' - this 1954 * doesn't matter for PNG sCAL chunk values, but it requires more care 1955 * if the value were ever to be embedded in something more complex. Use 1956 * ANSI-C strtod if you need the lookahead. 1957 */ 1958 /* State table for the parser. */ 1959 #define PNG_FP_INTEGER 0 /* before or in integer */ 1960 #define PNG_FP_FRACTION 1 /* before or in fraction */ 1961 #define PNG_FP_EXPONENT 2 /* before or in exponent */ 1962 #define PNG_FP_STATE 3 /* mask for the above */ 1963 #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */ 1964 #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */ 1965 #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */ 1966 #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */ 1967 #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */ 1968 1969 /* These three values don't affect the parser. They are set but not used. 1970 */ 1971 #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */ 1972 #define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */ 1973 #define PNG_FP_NONZERO 256 /* A non-zero value */ 1974 #define PNG_FP_STICKY 448 /* The above three flags */ 1975 1976 /* This is available for the caller to store in 'state' if required. Do not 1977 * call the parser after setting it (the parser sometimes clears it.) 1978 */ 1979 #define PNG_FP_INVALID 512 /* Available for callers as a distinct value */ 1980 1981 /* Result codes for the parser (boolean - true means ok, false means 1982 * not ok yet.) 1983 */ 1984 #define PNG_FP_MAYBE 0 /* The number may be valid in the future */ 1985 #define PNG_FP_OK 1 /* The number is valid */ 1986 1987 /* Tests on the sticky non-zero and negative flags. To pass these checks 1988 * the state must also indicate that the whole number is valid - this is 1989 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this 1990 * is equivalent to PNG_FP_OK above.) 1991 */ 1992 #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO) 1993 /* NZ_MASK: the string is valid and a non-zero negative value */ 1994 #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO) 1995 /* Z MASK: the string is valid and a non-zero value. */ 1996 /* PNG_FP_SAW_DIGIT: the string is valid. */ 1997 #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT) 1998 #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK) 1999 #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK) 2000 2001 /* The actual parser. This can be called repeatedly. It updates 2002 * the index into the string and the state variable (which must 2003 * be initialized to 0). It returns a result code, as above. There 2004 * is no point calling the parser any more if it fails to advance to 2005 * the end of the string - it is stuck on an invalid character (or 2006 * terminated by '\0'). 2007 * 2008 * Note that the pointer will consume an E or even an E+ and then leave 2009 * a 'maybe' state even though a preceding integer.fraction is valid. 2010 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was 2011 * a valid number. It's possible to recover from this by calling 2012 * the parser again (from the start, with state 0) but with a string 2013 * that omits the last character (i.e. set the size to the index of 2014 * the problem character.) This has not been tested within libpng. 2015 */ 2016 PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string, 2017 size_t size, int *statep, size_t *whereami),PNG_EMPTY); 2018 2019 /* This is the same but it checks a complete string and returns true 2020 * only if it just contains a floating point number. As of 1.5.4 this 2021 * function also returns the state at the end of parsing the number if 2022 * it was valid (otherwise it returns 0.) This can be used for testing 2023 * for negative or zero values using the sticky flag. 2024 */ 2025 PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string, 2026 size_t size),PNG_EMPTY); 2027 #endif /* pCAL || sCAL */ 2028 2029 #if defined(PNG_GAMMA_SUPPORTED) ||\ 2030 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED) 2031 /* Added at libpng version 1.5.0 */ 2032 /* This is a utility to provide a*times/div (rounded) and indicate 2033 * if there is an overflow. The result is a boolean - false (0) 2034 * for overflow, true (1) if no overflow, in which case *res 2035 * holds the result. 2036 */ 2037 PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a, 2038 png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY); 2039 #endif 2040 2041 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED) 2042 /* Same deal, but issue a warning on overflow and return 0. */ 2043 PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn, 2044 (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by, 2045 png_int_32 divided_by),PNG_EMPTY); 2046 #endif 2047 2048 #ifdef PNG_GAMMA_SUPPORTED 2049 /* Calculate a reciprocal - used for gamma values. This returns 2050 * 0 if the argument is 0 in order to maintain an undefined value; 2051 * there are no warnings. 2052 */ 2053 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a), 2054 PNG_EMPTY); 2055 2056 #ifdef PNG_READ_GAMMA_SUPPORTED 2057 /* The same but gives a reciprocal of the product of two fixed point 2058 * values. Accuracy is suitable for gamma calculations but this is 2059 * not exact - use png_muldiv for that. Only required at present on read. 2060 */ 2061 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a, 2062 png_fixed_point b),PNG_EMPTY); 2063 #endif 2064 2065 /* Return true if the gamma value is significantly different from 1.0 */ 2066 PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value), 2067 PNG_EMPTY); 2068 #endif 2069 2070 #ifdef PNG_READ_GAMMA_SUPPORTED 2071 /* Internal fixed point gamma correction. These APIs are called as 2072 * required to convert single values - they don't need to be fast, 2073 * they are not used when processing image pixel values. 2074 * 2075 * While the input is an 'unsigned' value it must actually be the 2076 * correct bit value - 0..255 or 0..65535 as required. 2077 */ 2078 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr, 2079 unsigned int value, png_fixed_point gamma_value),PNG_EMPTY); 2080 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value, 2081 png_fixed_point gamma_value),PNG_EMPTY); 2082 PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value, 2083 png_fixed_point gamma_value),PNG_EMPTY); 2084 PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr), 2085 PNG_EMPTY); 2086 PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr, 2087 int bit_depth),PNG_EMPTY); 2088 #endif 2089 2090 /* SIMPLIFIED READ/WRITE SUPPORT */ 2091 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 2092 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 2093 /* The internal structure that png_image::opaque points to. */ 2094 typedef struct png_control 2095 { 2096 png_structp png_ptr; 2097 png_infop info_ptr; 2098 png_voidp error_buf; /* Always a jmp_buf at present. */ 2099 2100 png_const_bytep memory; /* Memory buffer. */ 2101 size_t size; /* Size of the memory buffer. */ 2102 2103 unsigned int for_write :1; /* Otherwise it is a read structure */ 2104 unsigned int owned_file :1; /* We own the file in io_ptr */ 2105 } png_control; 2106 2107 /* Return the pointer to the jmp_buf from a png_control: necessary because C 2108 * does not reveal the type of the elements of jmp_buf. 2109 */ 2110 #ifdef __cplusplus 2111 # define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0]) 2112 #else 2113 # define png_control_jmp_buf(pc) ((pc)->error_buf) 2114 #endif 2115 2116 /* Utility to safely execute a piece of libpng code catching and logging any 2117 * errors that might occur. Returns true on success, false on failure (either 2118 * of the function or as a result of a png_error.) 2119 */ 2120 PNG_INTERNAL_CALLBACK(void,png_safe_error,(png_structp png_ptr, 2121 png_const_charp error_message),PNG_NORETURN); 2122 2123 #ifdef PNG_WARNINGS_SUPPORTED 2124 PNG_INTERNAL_CALLBACK(void,png_safe_warning,(png_structp png_ptr, 2125 png_const_charp warning_message),PNG_EMPTY); 2126 #else 2127 # define png_safe_warning 0/*dummy argument*/ 2128 #endif 2129 2130 PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image, 2131 int (*function)(png_voidp), png_voidp arg),PNG_EMPTY); 2132 2133 /* Utility to log an error; this also cleans up the png_image; the function 2134 * always returns 0 (false). 2135 */ 2136 PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image, 2137 png_const_charp error_message),PNG_EMPTY); 2138 2139 #ifndef PNG_SIMPLIFIED_READ_SUPPORTED 2140 /* png_image_free is used by the write code but not exported */ 2141 PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY); 2142 #endif /* !SIMPLIFIED_READ */ 2143 2144 #endif /* SIMPLIFIED READ/WRITE */ 2145 2146 /* These are initialization functions for hardware specific PNG filter 2147 * optimizations; list these here then select the appropriate one at compile 2148 * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined 2149 * the generic code is used. 2150 */ 2151 #ifdef PNG_FILTER_OPTIMIZATIONS 2152 PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr, 2153 unsigned int bpp), PNG_EMPTY); 2154 /* Just declare the optimization that will be used */ 2155 #else 2156 /* List *all* the possible optimizations here - this branch is required if 2157 * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in 2158 * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing. 2159 */ 2160 # if PNG_ARM_NEON_OPT > 0 2161 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon, 2162 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2163 #endif 2164 2165 #if PNG_MIPS_MSA_IMPLEMENTATION == 1 2166 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_mips, 2167 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2168 #endif 2169 2170 # if PNG_MIPS_MMI_IMPLEMENTATION > 0 2171 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_mips, 2172 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2173 # endif 2174 2175 # if PNG_INTEL_SSE_IMPLEMENTATION > 0 2176 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_sse2, 2177 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2178 # endif 2179 #endif 2180 2181 #if PNG_LOONGARCH_LSX_OPT > 0 2182 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_lsx, 2183 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2184 #endif 2185 2186 PNG_INTERNAL_FUNCTION(png_uint_32, png_check_keyword, (png_structrp png_ptr, 2187 png_const_charp key, png_bytep new_key), PNG_EMPTY); 2188 2189 #if PNG_ARM_NEON_IMPLEMENTATION == 1 2190 PNG_INTERNAL_FUNCTION(void, 2191 png_riffle_palette_neon, 2192 (png_structrp), 2193 PNG_EMPTY); 2194 PNG_INTERNAL_FUNCTION(int, 2195 png_do_expand_palette_rgba8_neon, 2196 (png_structrp, 2197 png_row_infop, 2198 png_const_bytep, 2199 const png_bytepp, 2200 const png_bytepp), 2201 PNG_EMPTY); 2202 PNG_INTERNAL_FUNCTION(int, 2203 png_do_expand_palette_rgb8_neon, 2204 (png_structrp, 2205 png_row_infop, 2206 png_const_bytep, 2207 const png_bytepp, 2208 const png_bytepp), 2209 PNG_EMPTY); 2210 #endif 2211 2212 /* Maintainer: Put new private prototypes here ^ */ 2213 2214 #include "pngdebug.h" 2215 2216 #ifdef __cplusplus 2217 } 2218 #endif 2219 2220 #endif /* PNG_VERSION_INFO_ONLY */ 2221 #endif /* PNGPRIV_H */ 2222