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 # ifndef PNG_ARM_NEON_IMPLEMENTATION 144 /* Use the intrinsics code by default. */ 145 # define PNG_ARM_NEON_IMPLEMENTATION 1 146 # endif 147 #else /* PNG_ARM_NEON_OPT == 0 */ 148 # define PNG_ARM_NEON_IMPLEMENTATION 0 149 #endif /* PNG_ARM_NEON_OPT > 0 */ 150 151 #ifndef PNG_MIPS_MSA_OPT 152 # if defined(__mips_msa) && (__mips_isa_rev >= 5) && \ 153 defined(PNG_ALIGNED_MEMORY_SUPPORTED) 154 # define PNG_MIPS_MSA_OPT 2 155 # else 156 # define PNG_MIPS_MSA_OPT 0 157 # endif 158 #endif 159 160 #ifndef PNG_MIPS_MMI_OPT 161 # ifdef PNG_MIPS_MMI 162 # if defined(__mips_loongson_mmi) && (_MIPS_SIM == _ABI64) && \ 163 defined(PNG_ALIGNED_MEMORY_SUPPORTED) 164 # define PNG_MIPS_MMI_OPT 1 165 # else 166 # define PNG_MIPS_MMI_OPT 0 167 # endif 168 # else 169 # define PNG_MIPS_MMI_OPT 0 170 # endif 171 #endif 172 173 #ifndef PNG_POWERPC_VSX_OPT 174 # if defined(__PPC64__) && defined(__ALTIVEC__) && defined(__VSX__) 175 # define PNG_POWERPC_VSX_OPT 2 176 # else 177 # define PNG_POWERPC_VSX_OPT 0 178 # endif 179 #endif 180 181 #ifndef PNG_LOONGARCH_LSX_OPT 182 # if defined(__loongarch_sx) 183 # define PNG_LOONGARCH_LSX_OPT 1 184 # else 185 # define PNG_LOONGARCH_LSX_OPT 0 186 # endif 187 #endif 188 189 #ifndef PNG_INTEL_SSE_OPT 190 # ifdef PNG_INTEL_SSE 191 /* Only check for SSE if the build configuration has been modified to 192 * enable SSE optimizations. This means that these optimizations will 193 * be off by default. See contrib/intel for more details. 194 */ 195 # if defined(__SSE4_1__) || defined(__AVX__) || defined(__SSSE3__) || \ 196 defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \ 197 (defined(_M_IX86_FP) && _M_IX86_FP >= 2) 198 # define PNG_INTEL_SSE_OPT 1 199 # else 200 # define PNG_INTEL_SSE_OPT 0 201 # endif 202 # else 203 # define PNG_INTEL_SSE_OPT 0 204 # endif 205 #endif 206 207 #if PNG_INTEL_SSE_OPT > 0 208 # ifndef PNG_INTEL_SSE_IMPLEMENTATION 209 # if defined(__SSE4_1__) || defined(__AVX__) 210 /* We are not actually using AVX, but checking for AVX is the best 211 way we can detect SSE4.1 and SSSE3 on MSVC. 212 */ 213 # define PNG_INTEL_SSE_IMPLEMENTATION 3 214 # elif defined(__SSSE3__) 215 # define PNG_INTEL_SSE_IMPLEMENTATION 2 216 # elif defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \ 217 (defined(_M_IX86_FP) && _M_IX86_FP >= 2) 218 # define PNG_INTEL_SSE_IMPLEMENTATION 1 219 # else 220 # define PNG_INTEL_SSE_IMPLEMENTATION 0 221 # endif 222 # endif 223 224 # if PNG_INTEL_SSE_IMPLEMENTATION > 0 225 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_sse2 226 # endif 227 #else 228 # define PNG_INTEL_SSE_IMPLEMENTATION 0 229 #endif 230 231 #if PNG_MIPS_MSA_OPT > 0 232 # ifndef PNG_MIPS_MSA_IMPLEMENTATION 233 # if defined(__mips_msa) 234 # if defined(__clang__) 235 # elif defined(__GNUC__) 236 # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7) 237 # define PNG_MIPS_MSA_IMPLEMENTATION 2 238 # endif /* no GNUC support */ 239 # endif /* __GNUC__ */ 240 # else /* !defined __mips_msa */ 241 # define PNG_MIPS_MSA_IMPLEMENTATION 2 242 # endif /* __mips_msa */ 243 # endif /* !PNG_MIPS_MSA_IMPLEMENTATION */ 244 245 # ifndef PNG_MIPS_MSA_IMPLEMENTATION 246 # define PNG_MIPS_MSA_IMPLEMENTATION 1 247 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_mips 248 # endif 249 #else 250 # define PNG_MIPS_MSA_IMPLEMENTATION 0 251 #endif /* PNG_MIPS_MSA_OPT > 0 */ 252 253 #if PNG_MIPS_MMI_OPT > 0 254 # ifndef PNG_MIPS_MMI_IMPLEMENTATION 255 # if defined(__mips_loongson_mmi) && (_MIPS_SIM == _ABI64) 256 # define PNG_MIPS_MMI_IMPLEMENTATION 2 257 # else /* !defined __mips_loongson_mmi || _MIPS_SIM != _ABI64 */ 258 # define PNG_MIPS_MMI_IMPLEMENTATION 0 259 # endif /* __mips_loongson_mmi && _MIPS_SIM == _ABI64 */ 260 # endif /* !PNG_MIPS_MMI_IMPLEMENTATION */ 261 262 # if PNG_MIPS_MMI_IMPLEMENTATION > 0 263 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_mips 264 # endif 265 #else 266 # define PNG_MIPS_MMI_IMPLEMENTATION 0 267 #endif /* PNG_MIPS_MMI_OPT > 0 */ 268 269 #if PNG_POWERPC_VSX_OPT > 0 270 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_vsx 271 # define PNG_POWERPC_VSX_IMPLEMENTATION 1 272 #else 273 # define PNG_POWERPC_VSX_IMPLEMENTATION 0 274 #endif 275 276 #if PNG_LOONGARCH_LSX_OPT > 0 277 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_lsx 278 # define PNG_LOONGARCH_LSX_IMPLEMENTATION 1 279 #else 280 # define PNG_LOONGARCH_LSX_IMPLEMENTATION 0 281 #endif 282 283 /* Is this a build of a DLL where compilation of the object modules requires 284 * different preprocessor settings to those required for a simple library? If 285 * so PNG_BUILD_DLL must be set. 286 * 287 * If libpng is used inside a DLL but that DLL does not export the libpng APIs 288 * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a 289 * static library of libpng then link the DLL against that. 290 */ 291 #ifndef PNG_BUILD_DLL 292 # ifdef DLL_EXPORT 293 /* This is set by libtool when files are compiled for a DLL; libtool 294 * always compiles twice, even on systems where it isn't necessary. Set 295 * PNG_BUILD_DLL in case it is necessary: 296 */ 297 # define PNG_BUILD_DLL 298 # else 299 # ifdef _WINDLL 300 /* This is set by the Microsoft Visual Studio IDE in projects that 301 * build a DLL. It can't easily be removed from those projects (it 302 * isn't visible in the Visual Studio UI) so it is a fairly reliable 303 * indication that PNG_IMPEXP needs to be set to the DLL export 304 * attributes. 305 */ 306 # define PNG_BUILD_DLL 307 # else 308 # ifdef __DLL__ 309 /* This is set by the Borland C system when compiling for a DLL 310 * (as above.) 311 */ 312 # define PNG_BUILD_DLL 313 # else 314 /* Add additional compiler cases here. */ 315 # endif 316 # endif 317 # endif 318 #endif /* Setting PNG_BUILD_DLL if required */ 319 320 /* See pngconf.h for more details: the builder of the library may set this on 321 * the command line to the right thing for the specific compilation system or it 322 * may be automagically set above (at present we know of no system where it does 323 * need to be set on the command line.) 324 * 325 * PNG_IMPEXP must be set here when building the library to prevent pngconf.h 326 * setting it to the "import" setting for a DLL build. 327 */ 328 #ifndef PNG_IMPEXP 329 # ifdef PNG_BUILD_DLL 330 # define PNG_IMPEXP PNG_DLL_EXPORT 331 # else 332 /* Not building a DLL, or the DLL doesn't require specific export 333 * definitions. 334 */ 335 # define PNG_IMPEXP 336 # endif 337 #endif 338 339 /* No warnings for private or deprecated functions in the build: */ 340 #ifndef PNG_DEPRECATED 341 # define PNG_DEPRECATED 342 #endif 343 #ifndef PNG_PRIVATE 344 # define PNG_PRIVATE 345 #endif 346 347 /* Symbol preprocessing support. 348 * 349 * To enable listing global, but internal, symbols the following macros should 350 * always be used to declare an extern data or function object in this file. 351 */ 352 #ifndef PNG_INTERNAL_DATA 353 # define PNG_INTERNAL_DATA(type, name, array) PNG_LINKAGE_DATA type name array 354 #endif 355 356 #ifndef PNG_INTERNAL_FUNCTION 357 # define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\ 358 PNG_LINKAGE_FUNCTION PNG_FUNCTION(type, name, args, PNG_EMPTY attributes) 359 #endif 360 361 #ifndef PNG_INTERNAL_CALLBACK 362 # define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\ 363 PNG_LINKAGE_CALLBACK PNG_FUNCTION(type, (PNGCBAPI name), args,\ 364 PNG_EMPTY attributes) 365 #endif 366 367 /* If floating or fixed point APIs are disabled they may still be compiled 368 * internally. To handle this make sure they are declared as the appropriate 369 * internal extern function (otherwise the symbol prefixing stuff won't work and 370 * the functions will be used without definitions.) 371 * 372 * NOTE: although all the API functions are declared here they are not all 373 * actually built! Because the declarations are still made it is necessary to 374 * fake out types that they depend on. 375 */ 376 #ifndef PNG_FP_EXPORT 377 # ifndef PNG_FLOATING_POINT_SUPPORTED 378 # define PNG_FP_EXPORT(ordinal, type, name, args)\ 379 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 380 # ifndef PNG_VERSION_INFO_ONLY 381 typedef struct png_incomplete png_double; 382 typedef png_double* png_doublep; 383 typedef const png_double* png_const_doublep; 384 typedef png_double** png_doublepp; 385 # endif 386 # endif 387 #endif 388 #ifndef PNG_FIXED_EXPORT 389 # ifndef PNG_FIXED_POINT_SUPPORTED 390 # define PNG_FIXED_EXPORT(ordinal, type, name, args)\ 391 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 392 # endif 393 #endif 394 395 #include "png.h" 396 397 /* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */ 398 #ifndef PNG_DLL_EXPORT 399 # define PNG_DLL_EXPORT 400 #endif 401 402 /* This is a global switch to set the compilation for an installed system 403 * (a release build). It can be set for testing debug builds to ensure that 404 * they will compile when the build type is switched to RC or STABLE, the 405 * default is just to use PNG_LIBPNG_BUILD_BASE_TYPE. Set this in CPPFLAGS 406 * with either: 407 * 408 * -DPNG_RELEASE_BUILD Turns on the release compile path 409 * -DPNG_RELEASE_BUILD=0 Turns it off 410 * or in your pngusr.h with 411 * #define PNG_RELEASE_BUILD=1 Turns on the release compile path 412 * #define PNG_RELEASE_BUILD=0 Turns it off 413 */ 414 #ifndef PNG_RELEASE_BUILD 415 # define PNG_RELEASE_BUILD (PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC) 416 #endif 417 418 /* SECURITY and SAFETY: 419 * 420 * libpng is built with support for internal limits on image dimensions and 421 * memory usage. These are documented in scripts/pnglibconf.dfa of the 422 * source and recorded in the machine generated header file pnglibconf.h. 423 */ 424 425 /* If you are running on a machine where you cannot allocate more 426 * than 64K of memory at once, uncomment this. While libpng will not 427 * normally need that much memory in a chunk (unless you load up a very 428 * large file), zlib needs to know how big of a chunk it can use, and 429 * libpng thus makes sure to check any memory allocation to verify it 430 * will fit into memory. 431 * 432 * zlib provides 'MAXSEG_64K' which, if defined, indicates the 433 * same limit and pngconf.h (already included) sets the limit 434 * if certain operating systems are detected. 435 */ 436 #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K) 437 # define PNG_MAX_MALLOC_64K 438 #endif 439 440 #ifndef PNG_UNUSED 441 /* Unused formal parameter warnings are silenced using the following macro 442 * which is expected to have no bad effects on performance (optimizing 443 * compilers will probably remove it entirely). Note that if you replace 444 * it with something other than whitespace, you must include the terminating 445 * semicolon. 446 */ 447 # define PNG_UNUSED(param) (void)param; 448 #endif 449 450 /* Just a little check that someone hasn't tried to define something 451 * contradictory. 452 */ 453 #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K) 454 # undef PNG_ZBUF_SIZE 455 # define PNG_ZBUF_SIZE 65536L 456 #endif 457 458 /* If warnings or errors are turned off the code is disabled or redirected here. 459 * From 1.5.4 functions have been added to allow very limited formatting of 460 * error and warning messages - this code will also be disabled here. 461 */ 462 #ifdef PNG_WARNINGS_SUPPORTED 463 # define PNG_WARNING_PARAMETERS(p) png_warning_parameters p; 464 #else 465 # define png_warning_parameter(p,number,string) ((void)0) 466 # define png_warning_parameter_unsigned(p,number,format,value) ((void)0) 467 # define png_warning_parameter_signed(p,number,format,value) ((void)0) 468 # define png_formatted_warning(pp,p,message) ((void)(pp)) 469 # define PNG_WARNING_PARAMETERS(p) 470 #endif 471 #ifndef PNG_ERROR_TEXT_SUPPORTED 472 # define png_fixed_error(s1,s2) png_err(s1) 473 #endif 474 475 /* Some fixed point APIs are still required even if not exported because 476 * they get used by the corresponding floating point APIs. This magic 477 * deals with this: 478 */ 479 #ifdef PNG_FIXED_POINT_SUPPORTED 480 # define PNGFAPI PNGAPI 481 #else 482 # define PNGFAPI /* PRIVATE */ 483 #endif 484 485 #ifndef PNG_VERSION_INFO_ONLY 486 /* Other defines specific to compilers can go here. Try to keep 487 * them inside an appropriate ifdef/endif pair for portability. 488 */ 489 490 /* C allows up-casts from (void*) to any pointer and (const void*) to any 491 * pointer to a const object. C++ regards this as a type error and requires an 492 * explicit, static, cast and provides the static_cast<> rune to ensure that 493 * const is not cast away. 494 */ 495 #ifdef __cplusplus 496 # define png_voidcast(type, value) static_cast<type>(value) 497 # define png_constcast(type, value) const_cast<type>(value) 498 # define png_aligncast(type, value) \ 499 static_cast<type>(static_cast<void*>(value)) 500 # define png_aligncastconst(type, value) \ 501 static_cast<type>(static_cast<const void*>(value)) 502 #else 503 # define png_voidcast(type, value) (value) 504 # define png_constcast(type, value) ((type)(void*)(const void*)(value)) 505 # define png_aligncast(type, value) ((void*)(value)) 506 # define png_aligncastconst(type, value) ((const void*)(value)) 507 #endif /* __cplusplus */ 508 509 #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\ 510 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) 511 /* png.c requires the following ANSI-C constants if the conversion of 512 * floating point to ASCII is implemented therein: 513 * 514 * DBL_DIG Maximum number of decimal digits (can be set to any constant) 515 * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value) 516 * DBL_MAX Maximum floating point number (can be set to an arbitrary value) 517 */ 518 # include <float.h> 519 520 # include <math.h> 521 522 # if defined(_AMIGA) && defined(__SASC) && defined(_M68881) 523 /* Amiga SAS/C: We must include builtin FPU functions when compiling using 524 * MATH=68881 525 */ 526 # include <m68881.h> 527 # endif 528 #endif 529 530 /* This provides the non-ANSI (far) memory allocation routines. */ 531 #if defined(__TURBOC__) && defined(__MSDOS__) 532 # include <mem.h> 533 # include <alloc.h> 534 #endif 535 536 #if defined(_WIN32) || defined(__WIN32__) || defined(__NT__) 537 # include <windows.h> 538 #endif 539 #endif /* PNG_VERSION_INFO_ONLY */ 540 541 /* Moved here around 1.5.0beta36 from pngconf.h */ 542 /* Users may want to use these so they are not private. Any library 543 * functions that are passed far data must be model-independent. 544 */ 545 546 /* Platform-independent functions */ 547 #ifndef PNG_ABORT 548 # define PNG_ABORT() abort() 549 #endif 550 551 /* These macros may need to be architecture dependent. */ 552 #define PNG_ALIGN_NONE 0 /* do not use data alignment */ 553 #define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */ 554 #ifdef offsetof 555 # define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */ 556 #else 557 # define PNG_ALIGN_OFFSET -1 /* prevent the use of this */ 558 #endif 559 #define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */ 560 561 #ifndef PNG_ALIGN_TYPE 562 /* Default to using aligned access optimizations and requiring alignment to a 563 * multiple of the data type size. Override in a compiler specific fashion 564 * if necessary by inserting tests here: 565 */ 566 # define PNG_ALIGN_TYPE PNG_ALIGN_SIZE 567 #endif 568 569 #if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE 570 /* This is used because in some compiler implementations non-aligned 571 * structure members are supported, so the offsetof approach below fails. 572 * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access 573 * is good for performance. Do not do this unless you have tested the 574 * result and understand it. 575 */ 576 # define png_alignof(type) (sizeof(type)) 577 #else 578 # if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET 579 # define png_alignof(type) offsetof(struct{char c; type t;}, t) 580 # else 581 # if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS 582 # define png_alignof(type) 1 583 # endif 584 /* Else leave png_alignof undefined to prevent use thereof */ 585 # endif 586 #endif 587 588 /* This implicitly assumes alignment is always a multiple of 2. */ 589 #ifdef png_alignof 590 # define png_isaligned(ptr, type) \ 591 (((type)(size_t)((const void*)(ptr)) & (type)(png_alignof(type)-1)) == 0) 592 #else 593 # define png_isaligned(ptr, type) 0 594 #endif 595 596 /* End of memory model/platform independent support */ 597 /* End of 1.5.0beta36 move from pngconf.h */ 598 599 /* CONSTANTS and UTILITY MACROS 600 * These are used internally by libpng and not exposed in the API 601 */ 602 603 /* Various modes of operation. Note that after an init, mode is set to 604 * zero automatically when the structure is created. Three of these 605 * are defined in png.h because they need to be visible to applications 606 * that call png_set_unknown_chunk(). 607 */ 608 /* #define PNG_HAVE_IHDR 0x01U (defined in png.h) */ 609 /* #define PNG_HAVE_PLTE 0x02U (defined in png.h) */ 610 #define PNG_HAVE_IDAT 0x04U 611 /* #define PNG_AFTER_IDAT 0x08U (defined in png.h) */ 612 #define PNG_HAVE_IEND 0x10U 613 /* 0x20U (unused) */ 614 /* 0x40U (unused) */ 615 /* 0x80U (unused) */ 616 #define PNG_HAVE_CHUNK_HEADER 0x100U 617 #define PNG_WROTE_tIME 0x200U 618 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400U 619 #define PNG_BACKGROUND_IS_GRAY 0x800U 620 #define PNG_HAVE_PNG_SIGNATURE 0x1000U 621 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000U /* Have another chunk after IDAT */ 622 #define PNG_WROTE_eXIf 0x4000U 623 #define PNG_IS_READ_STRUCT 0x8000U /* Else is a write struct */ 624 625 /* Flags for the transformations the PNG library does on the image data */ 626 #define PNG_BGR 0x0001U 627 #define PNG_INTERLACE 0x0002U 628 #define PNG_PACK 0x0004U 629 #define PNG_SHIFT 0x0008U 630 #define PNG_SWAP_BYTES 0x0010U 631 #define PNG_INVERT_MONO 0x0020U 632 #define PNG_QUANTIZE 0x0040U 633 #define PNG_COMPOSE 0x0080U /* Was PNG_BACKGROUND */ 634 #define PNG_BACKGROUND_EXPAND 0x0100U 635 #define PNG_EXPAND_16 0x0200U /* Added to libpng 1.5.2 */ 636 #define PNG_16_TO_8 0x0400U /* Becomes 'chop' in 1.5.4 */ 637 #define PNG_RGBA 0x0800U 638 #define PNG_EXPAND 0x1000U 639 #define PNG_GAMMA 0x2000U 640 #define PNG_GRAY_TO_RGB 0x4000U 641 #define PNG_FILLER 0x8000U 642 #define PNG_PACKSWAP 0x10000U 643 #define PNG_SWAP_ALPHA 0x20000U 644 #define PNG_STRIP_ALPHA 0x40000U 645 #define PNG_INVERT_ALPHA 0x80000U 646 #define PNG_USER_TRANSFORM 0x100000U 647 #define PNG_RGB_TO_GRAY_ERR 0x200000U 648 #define PNG_RGB_TO_GRAY_WARN 0x400000U 649 #define PNG_RGB_TO_GRAY 0x600000U /* two bits, RGB_TO_GRAY_ERR|WARN */ 650 #define PNG_ENCODE_ALPHA 0x800000U /* Added to libpng-1.5.4 */ 651 #define PNG_ADD_ALPHA 0x1000000U /* Added to libpng-1.2.7 */ 652 #define PNG_EXPAND_tRNS 0x2000000U /* Added to libpng-1.2.9 */ 653 #define PNG_SCALE_16_TO_8 0x4000000U /* Added to libpng-1.5.4 */ 654 /* 0x8000000U unused */ 655 /* 0x10000000U unused */ 656 /* 0x20000000U unused */ 657 /* 0x40000000U unused */ 658 /* Flags for png_create_struct */ 659 #define PNG_STRUCT_PNG 0x0001U 660 #define PNG_STRUCT_INFO 0x0002U 661 662 /* Flags for the png_ptr->flags rather than declaring a byte for each one */ 663 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001U 664 #define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002U /* Added to libpng-1.6.0 */ 665 /* 0x0004U unused */ 666 #define PNG_FLAG_ZSTREAM_ENDED 0x0008U /* Added to libpng-1.6.0 */ 667 /* 0x0010U unused */ 668 /* 0x0020U unused */ 669 #define PNG_FLAG_ROW_INIT 0x0040U 670 #define PNG_FLAG_FILLER_AFTER 0x0080U 671 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100U 672 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200U 673 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400U 674 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800U 675 #define PNG_FLAG_ASSUME_sRGB 0x1000U /* Added to libpng-1.5.4 */ 676 #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000U /* Added to libpng-1.5.4 */ 677 #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000U /* Added to libpng-1.5.4 */ 678 /* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000U */ 679 /* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000U */ 680 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000U 681 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000U 682 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000U 683 #define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000U /* Added to libpng-1.4.0 */ 684 #define PNG_FLAG_APP_WARNINGS_WARN 0x200000U /* Added to libpng-1.6.0 */ 685 #define PNG_FLAG_APP_ERRORS_WARN 0x400000U /* Added to libpng-1.6.0 */ 686 /* 0x800000U unused */ 687 /* 0x1000000U unused */ 688 /* 0x2000000U unused */ 689 /* 0x4000000U unused */ 690 /* 0x8000000U unused */ 691 /* 0x10000000U unused */ 692 /* 0x20000000U unused */ 693 /* 0x40000000U unused */ 694 695 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 696 PNG_FLAG_CRC_ANCILLARY_NOWARN) 697 698 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 699 PNG_FLAG_CRC_CRITICAL_IGNORE) 700 701 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 702 PNG_FLAG_CRC_CRITICAL_MASK) 703 704 /* Save typing and make code easier to understand */ 705 706 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 707 abs((int)((c1).green) - (int)((c2).green)) + \ 708 abs((int)((c1).blue) - (int)((c2).blue))) 709 710 /* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255 711 * by dividing by 257 *with rounding*. This macro is exact for the given range. 712 * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the 713 * macro were established by experiment (modifying the added value). The macro 714 * has a second variant that takes a value already scaled by 255 and divides by 715 * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it 716 * only gives off-by-one errors and only for 0.5% (1 in 200) of the values. 717 */ 718 #define PNG_DIV65535(v24) (((v24) + 32895) >> 16) 719 #define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255) 720 721 /* Added to libpng-1.2.6 JB */ 722 #define PNG_ROWBYTES(pixel_bits, width) \ 723 ((pixel_bits) >= 8 ? \ 724 ((size_t)(width) * (((size_t)(pixel_bits)) >> 3)) : \ 725 (( ((size_t)(width) * ((size_t)(pixel_bits))) + 7) >> 3) ) 726 727 /* This returns the number of trailing bits in the last byte of a row, 0 if the 728 * last byte is completely full of pixels. It is, in principle, (pixel_bits x 729 * width) % 8, but that would overflow for large 'width'. The second macro is 730 * the same except that it returns the number of unused bits in the last byte; 731 * (8-TRAILBITS), but 0 when TRAILBITS is 0. 732 * 733 * NOTE: these macros are intended to be self-evidently correct and never 734 * overflow on the assumption that pixel_bits is in the range 0..255. The 735 * arguments are evaluated only once and they can be signed (e.g. as a result of 736 * the integral promotions). The result of the expression always has type 737 * (png_uint_32), however the compiler always knows it is in the range 0..7. 738 */ 739 #define PNG_TRAILBITS(pixel_bits, width) \ 740 (((pixel_bits) * ((width) % (png_uint_32)8)) % 8) 741 742 #define PNG_PADBITS(pixel_bits, width) \ 743 ((8 - PNG_TRAILBITS(pixel_bits, width)) % 8) 744 745 /* PNG_OUT_OF_RANGE returns true if value is outside the range 746 * ideal-delta..ideal+delta. Each argument is evaluated twice. 747 * "ideal" and "delta" should be constants, normally simple 748 * integers, "value" a variable. Added to libpng-1.2.6 JB 749 */ 750 #define PNG_OUT_OF_RANGE(value, ideal, delta) \ 751 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 752 753 /* Conversions between fixed and floating point, only defined if 754 * required (to make sure the code doesn't accidentally use float 755 * when it is supposedly disabled.) 756 */ 757 #ifdef PNG_FLOATING_POINT_SUPPORTED 758 /* The floating point conversion can't overflow, though it can and 759 * does lose accuracy relative to the original fixed point value. 760 * In practice this doesn't matter because png_fixed_point only 761 * stores numbers with very low precision. The png_ptr and s 762 * arguments are unused by default but are there in case error 763 * checking becomes a requirement. 764 */ 765 #define png_float(png_ptr, fixed, s) (.00001 * (fixed)) 766 767 /* The fixed point conversion performs range checking and evaluates 768 * its argument multiple times, so must be used with care. The 769 * range checking uses the PNG specification values for a signed 770 * 32-bit fixed point value except that the values are deliberately 771 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly 772 * (2^31-1) * 100000). 's' is a string that describes the value being 773 * converted. 774 * 775 * NOTE: this macro will raise a png_error if the range check fails, 776 * therefore it is normally only appropriate to use this on values 777 * that come from API calls or other sources where an out of range 778 * error indicates a programming error, not a data error! 779 * 780 * NOTE: by default this is off - the macro is not used - because the 781 * function call saves a lot of code. 782 */ 783 #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED 784 #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\ 785 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0)) 786 #endif 787 /* else the corresponding function is defined below, inside the scope of the 788 * cplusplus test. 789 */ 790 #endif 791 792 /* Constants for known chunk types. If you need to add a chunk, define the name 793 * here. For historical reasons these constants have the form png_<name>; i.e. 794 * the prefix is lower case. Please use decimal values as the parameters to 795 * match the ISO PNG specification and to avoid relying on the C locale 796 * interpretation of character values. 797 * 798 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values 799 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string 800 * to be generated if required. 801 * 802 * PNG_32b correctly produces a value shifted by up to 24 bits, even on 803 * architectures where (int) is only 16 bits. 804 */ 805 #define PNG_32b(b,s) ((png_uint_32)(b) << (s)) 806 #define PNG_U32(b1,b2,b3,b4) \ 807 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0)) 808 809 /* Constants for known chunk types. 810 * 811 * MAINTAINERS: If you need to add a chunk, define the name here. 812 * For historical reasons these constants have the form png_<name>; i.e. 813 * the prefix is lower case. Please use decimal values as the parameters to 814 * match the ISO PNG specification and to avoid relying on the C locale 815 * interpretation of character values. Please keep the list sorted. 816 * 817 * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk 818 * type. In fact the specification does not express chunk types this way, 819 * however using a 32-bit value means that the chunk type can be read from the 820 * stream using exactly the same code as used for a 32-bit unsigned value and 821 * can be examined far more efficiently (using one arithmetic compare). 822 * 823 * Prior to 1.5.6 the chunk type constants were expressed as C strings. The 824 * libpng API still uses strings for 'unknown' chunks and a macro, 825 * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice 826 * that for portable code numeric values must still be used; the string "IHDR" 827 * is not portable and neither is PNG_U32('I', 'H', 'D', 'R'). 828 * 829 * In 1.7.0 the definitions will be made public in png.h to avoid having to 830 * duplicate the same definitions in application code. 831 */ 832 #define png_IDAT PNG_U32( 73, 68, 65, 84) 833 #define png_IEND PNG_U32( 73, 69, 78, 68) 834 #define png_IHDR PNG_U32( 73, 72, 68, 82) 835 #define png_PLTE PNG_U32( 80, 76, 84, 69) 836 #define png_bKGD PNG_U32( 98, 75, 71, 68) 837 #define png_cHRM PNG_U32( 99, 72, 82, 77) 838 #define png_eXIf PNG_U32(101, 88, 73, 102) /* registered July 2017 */ 839 #define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */ 840 #define png_gAMA PNG_U32(103, 65, 77, 65) 841 #define png_gIFg PNG_U32(103, 73, 70, 103) 842 #define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */ 843 #define png_gIFx PNG_U32(103, 73, 70, 120) 844 #define png_hIST PNG_U32(104, 73, 83, 84) 845 #define png_iCCP PNG_U32(105, 67, 67, 80) 846 #define png_iTXt PNG_U32(105, 84, 88, 116) 847 #define png_oFFs PNG_U32(111, 70, 70, 115) 848 #define png_pCAL PNG_U32(112, 67, 65, 76) 849 #define png_pHYs PNG_U32(112, 72, 89, 115) 850 #define png_sBIT PNG_U32(115, 66, 73, 84) 851 #define png_sCAL PNG_U32(115, 67, 65, 76) 852 #define png_sPLT PNG_U32(115, 80, 76, 84) 853 #define png_sRGB PNG_U32(115, 82, 71, 66) 854 #define png_sTER PNG_U32(115, 84, 69, 82) 855 #define png_tEXt PNG_U32(116, 69, 88, 116) 856 #define png_tIME PNG_U32(116, 73, 77, 69) 857 #define png_tRNS PNG_U32(116, 82, 78, 83) 858 #define png_zTXt PNG_U32(122, 84, 88, 116) 859 860 /* The following will work on (signed char*) strings, whereas the get_uint_32 861 * macro will fail on top-bit-set values because of the sign extension. 862 */ 863 #define PNG_CHUNK_FROM_STRING(s)\ 864 PNG_U32(0xff & (s)[0], 0xff & (s)[1], 0xff & (s)[2], 0xff & (s)[3]) 865 866 /* This uses (char), not (png_byte) to avoid warnings on systems where (char) is 867 * signed and the argument is a (char[]) This macro will fail miserably on 868 * systems where (char) is more than 8 bits. 869 */ 870 #define PNG_STRING_FROM_CHUNK(s,c)\ 871 (void)(((char*)(s))[0]=(char)(((c)>>24) & 0xff), \ 872 ((char*)(s))[1]=(char)(((c)>>16) & 0xff),\ 873 ((char*)(s))[2]=(char)(((c)>>8) & 0xff), \ 874 ((char*)(s))[3]=(char)((c & 0xff))) 875 876 /* Do the same but terminate with a null character. */ 877 #define PNG_CSTRING_FROM_CHUNK(s,c)\ 878 (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0) 879 880 /* Test on flag values as defined in the spec (section 5.4): */ 881 #define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29)) 882 #define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c)) 883 #define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21)) 884 #define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13)) 885 #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5)) 886 887 /* Gamma values (new at libpng-1.5.4): */ 888 #define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */ 889 #define PNG_GAMMA_MAC_INVERSE 65909 890 #define PNG_GAMMA_sRGB_INVERSE 45455 891 892 /* Almost everything below is C specific; the #defines above can be used in 893 * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot. 894 */ 895 #ifndef PNG_VERSION_INFO_ONLY 896 897 #include "pngstruct.h" 898 #include "pnginfo.h" 899 900 /* Validate the include paths - the include path used to generate pnglibconf.h 901 * must match that used in the build, or we must be using pnglibconf.h.prebuilt: 902 */ 903 #if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM 904 # error ZLIB_VERNUM != PNG_ZLIB_VERNUM \ 905 "-I (include path) error: see the notes in pngpriv.h" 906 /* This means that when pnglibconf.h was built the copy of zlib.h that it 907 * used is not the same as the one being used here. Because the build of 908 * libpng makes decisions to use inflateInit2 and inflateReset2 based on the 909 * zlib version number and because this affects handling of certain broken 910 * PNG files the -I directives must match. 911 * 912 * The most likely explanation is that you passed a -I in CFLAGS. This will 913 * not work; all the preprocessor directives and in particular all the -I 914 * directives must be in CPPFLAGS. 915 */ 916 #endif 917 918 /* This is used for 16-bit gamma tables -- only the top level pointers are 919 * const; this could be changed: 920 */ 921 typedef const png_uint_16p * png_const_uint_16pp; 922 923 /* Added to libpng-1.5.7: sRGB conversion tables */ 924 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 925 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 926 #ifdef PNG_SIMPLIFIED_READ_SUPPORTED 927 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]); 928 /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value, 929 * 0..65535. This table gives the closest 16-bit answers (no errors). 930 */ 931 #endif 932 933 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]); 934 PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]); 935 936 #define PNG_sRGB_FROM_LINEAR(linear) \ 937 ((png_byte)(0xff & ((png_sRGB_base[(linear)>>15] \ 938 + ((((linear) & 0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8))) 939 /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB 940 * encoded value with maximum error 0.646365. Note that the input is not a 941 * 16-bit value; it has been multiplied by 255! */ 942 #endif /* SIMPLIFIED_READ/WRITE */ 943 944 945 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 946 #ifdef __cplusplus 947 extern "C" { 948 #endif /* __cplusplus */ 949 950 /* Internal functions; these are not exported from a DLL however because they 951 * are used within several of the C source files they have to be C extern. 952 * 953 * All of these functions must be declared with PNG_INTERNAL_FUNCTION. 954 */ 955 956 /* Zlib support */ 957 #define PNG_UNEXPECTED_ZLIB_RETURN (-7) 958 PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret), 959 PNG_EMPTY); 960 /* Used by the zlib handling functions to ensure that z_stream::msg is always 961 * set before they return. 962 */ 963 964 #ifdef PNG_WRITE_SUPPORTED 965 PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr, 966 png_compression_bufferp *list),PNG_EMPTY); 967 /* Free the buffer list used by the compressed write code. */ 968 #endif 969 970 #if defined(PNG_FLOATING_POINT_SUPPORTED) && \ 971 !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \ 972 (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \ 973 defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \ 974 defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \ 975 (defined(PNG_sCAL_SUPPORTED) && \ 976 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)) 977 PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr, 978 double fp, png_const_charp text),PNG_EMPTY); 979 #endif 980 981 /* Check the user version string for compatibility, returns false if the version 982 * numbers aren't compatible. 983 */ 984 PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr, 985 png_const_charp user_png_ver),PNG_EMPTY); 986 987 /* Internal base allocator - no messages, NULL on failure to allocate. This 988 * does, however, call the application provided allocator and that could call 989 * png_error (although that would be a bug in the application implementation.) 990 */ 991 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr, 992 png_alloc_size_t size),PNG_ALLOCATED); 993 994 #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\ 995 defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED) 996 /* Internal array allocator, outputs no error or warning messages on failure, 997 * just returns NULL. 998 */ 999 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr, 1000 int nelements, size_t element_size),PNG_ALLOCATED); 1001 1002 /* The same but an existing array is extended by add_elements. This function 1003 * also memsets the new elements to 0 and copies the old elements. The old 1004 * array is not freed or altered. 1005 */ 1006 PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr, 1007 png_const_voidp array, int old_elements, int add_elements, 1008 size_t element_size),PNG_ALLOCATED); 1009 #endif /* text, sPLT or unknown chunks */ 1010 1011 /* Magic to create a struct when there is no struct to call the user supplied 1012 * memory allocators. Because error handling has not been set up the memory 1013 * handlers can't safely call png_error, but this is an obscure and undocumented 1014 * restriction so libpng has to assume that the 'free' handler, at least, might 1015 * call png_error. 1016 */ 1017 PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct, 1018 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, 1019 png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, 1020 png_free_ptr free_fn),PNG_ALLOCATED); 1021 1022 /* Free memory from internal libpng struct */ 1023 PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr), 1024 PNG_EMPTY); 1025 1026 /* Free an allocated jmp_buf (always succeeds) */ 1027 PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY); 1028 1029 /* Function to allocate memory for zlib. PNGAPI is disallowed. */ 1030 PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size), 1031 PNG_ALLOCATED); 1032 1033 /* Function to free memory for zlib. PNGAPI is disallowed. */ 1034 PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY); 1035 1036 /* Next four functions are used internally as callbacks. PNGCBAPI is required 1037 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to 1038 * PNGCBAPI at 1.5.0 1039 */ 1040 1041 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr, 1042 png_bytep data, size_t length),PNG_EMPTY); 1043 1044 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1045 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr, 1046 png_bytep buffer, size_t length),PNG_EMPTY); 1047 #endif 1048 1049 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr, 1050 png_bytep data, size_t length),PNG_EMPTY); 1051 1052 #ifdef PNG_WRITE_FLUSH_SUPPORTED 1053 # ifdef PNG_STDIO_SUPPORTED 1054 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr), 1055 PNG_EMPTY); 1056 # endif 1057 #endif 1058 1059 /* Reset the CRC variable */ 1060 PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY); 1061 1062 /* Write the "data" buffer to whatever output you are using */ 1063 PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr, 1064 png_const_bytep data, size_t length),PNG_EMPTY); 1065 1066 /* Read and check the PNG file signature */ 1067 PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr, 1068 png_inforp info_ptr),PNG_EMPTY); 1069 1070 /* Read the chunk header (length + type name) */ 1071 PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr), 1072 PNG_EMPTY); 1073 1074 /* Read data from whatever input you are using into the "data" buffer */ 1075 PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data, 1076 size_t length),PNG_EMPTY); 1077 1078 /* Read bytes into buf, and update png_ptr->crc */ 1079 PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf, 1080 png_uint_32 length),PNG_EMPTY); 1081 1082 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 1083 PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr, 1084 png_uint_32 skip),PNG_EMPTY); 1085 1086 /* Read the CRC from the file and compare it to the libpng calculated CRC */ 1087 PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY); 1088 1089 /* Calculate the CRC over a section of data. Note that we are only 1090 * passing a maximum of 64K on systems that have this as a memory limit, 1091 * since this is the maximum buffer size we can specify. 1092 */ 1093 PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr, 1094 png_const_bytep ptr, size_t length),PNG_EMPTY); 1095 1096 #ifdef PNG_WRITE_FLUSH_SUPPORTED 1097 PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY); 1098 #endif 1099 1100 /* Write various chunks */ 1101 1102 /* Write the IHDR chunk, and update the png_struct with the necessary 1103 * information. 1104 */ 1105 PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr, 1106 png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, 1107 int compression_method, int filter_method, int interlace_method),PNG_EMPTY); 1108 1109 PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr, 1110 png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY); 1111 1112 PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr, 1113 png_const_bytep row_data, png_alloc_size_t row_data_length, int flush), 1114 PNG_EMPTY); 1115 1116 PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY); 1117 1118 #ifdef PNG_WRITE_gAMA_SUPPORTED 1119 PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr, 1120 png_fixed_point file_gamma),PNG_EMPTY); 1121 #endif 1122 1123 #ifdef PNG_WRITE_sBIT_SUPPORTED 1124 PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr, 1125 png_const_color_8p sbit, int color_type),PNG_EMPTY); 1126 #endif 1127 1128 #ifdef PNG_WRITE_cHRM_SUPPORTED 1129 PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr, 1130 const png_xy *xy), PNG_EMPTY); 1131 /* The xy value must have been previously validated */ 1132 #endif 1133 1134 #ifdef PNG_WRITE_sRGB_SUPPORTED 1135 PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr, 1136 int intent),PNG_EMPTY); 1137 #endif 1138 1139 #ifdef PNG_WRITE_eXIf_SUPPORTED 1140 PNG_INTERNAL_FUNCTION(void,png_write_eXIf,(png_structrp png_ptr, 1141 png_bytep exif, int num_exif),PNG_EMPTY); 1142 #endif 1143 1144 #ifdef PNG_WRITE_iCCP_SUPPORTED 1145 PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr, 1146 png_const_charp name, png_const_bytep profile), PNG_EMPTY); 1147 /* The profile must have been previously validated for correctness, the 1148 * length comes from the first four bytes. Only the base, deflate, 1149 * compression is supported. 1150 */ 1151 #endif 1152 1153 #ifdef PNG_WRITE_sPLT_SUPPORTED 1154 PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr, 1155 png_const_sPLT_tp palette),PNG_EMPTY); 1156 #endif 1157 1158 #ifdef PNG_WRITE_tRNS_SUPPORTED 1159 PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr, 1160 png_const_bytep trans, png_const_color_16p values, int number, 1161 int color_type),PNG_EMPTY); 1162 #endif 1163 1164 #ifdef PNG_WRITE_bKGD_SUPPORTED 1165 PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr, 1166 png_const_color_16p values, int color_type),PNG_EMPTY); 1167 #endif 1168 1169 #ifdef PNG_WRITE_hIST_SUPPORTED 1170 PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr, 1171 png_const_uint_16p hist, int num_hist),PNG_EMPTY); 1172 #endif 1173 1174 /* Chunks that have keywords */ 1175 #ifdef PNG_WRITE_tEXt_SUPPORTED 1176 PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr, 1177 png_const_charp key, png_const_charp text, size_t text_len),PNG_EMPTY); 1178 #endif 1179 1180 #ifdef PNG_WRITE_zTXt_SUPPORTED 1181 PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp 1182 key, png_const_charp text, int compression),PNG_EMPTY); 1183 #endif 1184 1185 #ifdef PNG_WRITE_iTXt_SUPPORTED 1186 PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr, 1187 int compression, png_const_charp key, png_const_charp lang, 1188 png_const_charp lang_key, png_const_charp text),PNG_EMPTY); 1189 #endif 1190 1191 #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ 1192 PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr, 1193 png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY); 1194 #endif 1195 1196 #ifdef PNG_WRITE_oFFs_SUPPORTED 1197 PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr, 1198 png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY); 1199 #endif 1200 1201 #ifdef PNG_WRITE_pCAL_SUPPORTED 1202 PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr, 1203 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, 1204 png_const_charp units, png_charpp params),PNG_EMPTY); 1205 #endif 1206 1207 #ifdef PNG_WRITE_pHYs_SUPPORTED 1208 PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr, 1209 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 1210 int unit_type),PNG_EMPTY); 1211 #endif 1212 1213 #ifdef PNG_WRITE_tIME_SUPPORTED 1214 PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr, 1215 png_const_timep mod_time),PNG_EMPTY); 1216 #endif 1217 1218 #ifdef PNG_WRITE_sCAL_SUPPORTED 1219 PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr, 1220 int unit, png_const_charp width, png_const_charp height),PNG_EMPTY); 1221 #endif 1222 1223 /* Called when finished processing a row of data */ 1224 PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr), 1225 PNG_EMPTY); 1226 1227 /* Internal use only. Called before first row of data */ 1228 PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr), 1229 PNG_EMPTY); 1230 1231 /* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an 1232 * array of png_ptr->width pixels. If the image is not interlaced or this 1233 * is the final pass this just does a memcpy, otherwise the "display" flag 1234 * is used to determine whether to copy pixels that are not in the current pass. 1235 * 1236 * Because 'png_do_read_interlace' (below) replicates pixels this allows this 1237 * function to achieve the documented 'blocky' appearance during interlaced read 1238 * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row' 1239 * are not changed if they are not in the current pass, when display is 0. 1240 * 1241 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless. 1242 * 1243 * The API always reads from the png_struct row buffer and always assumes that 1244 * it is full width (png_do_read_interlace has already been called.) 1245 * 1246 * This function is only ever used to write to row buffers provided by the 1247 * caller of the relevant libpng API and the row must have already been 1248 * transformed by the read transformations. 1249 * 1250 * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed 1251 * bitmasks for use within the code, otherwise runtime generated masks are used. 1252 * The default is compile time masks. 1253 */ 1254 #ifndef PNG_USE_COMPILE_TIME_MASKS 1255 # define PNG_USE_COMPILE_TIME_MASKS 1 1256 #endif 1257 PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr, 1258 png_bytep row, int display),PNG_EMPTY); 1259 1260 #ifdef PNG_READ_INTERLACING_SUPPORTED 1261 /* Expand an interlaced row: the 'row_info' describes the pass data that has 1262 * been read in and must correspond to the pixels in 'row', the pixels are 1263 * expanded (moved apart) in 'row' to match the final layout, when doing this 1264 * the pixels are *replicated* to the intervening space. This is essential for 1265 * the correct operation of png_combine_row, above. 1266 */ 1267 PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info, 1268 png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY); 1269 #endif 1270 1271 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 1272 1273 #ifdef PNG_WRITE_INTERLACING_SUPPORTED 1274 /* Grab pixels out of a row for an interlaced pass */ 1275 PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info, 1276 png_bytep row, int pass),PNG_EMPTY); 1277 #endif 1278 1279 /* Unfilter a row: check the filter value before calling this, there is no point 1280 * calling it for PNG_FILTER_VALUE_NONE. 1281 */ 1282 PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop 1283 row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY); 1284 1285 #if PNG_ARM_NEON_OPT > 0 1286 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info, 1287 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1288 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop 1289 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1290 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop 1291 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1292 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop 1293 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1294 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop 1295 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1296 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop 1297 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1298 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop 1299 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1300 #endif 1301 1302 #if PNG_MIPS_MSA_IMPLEMENTATION == 1 1303 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_msa,(png_row_infop row_info, 1304 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1305 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_msa,(png_row_infop 1306 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1307 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_msa,(png_row_infop 1308 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1309 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_msa,(png_row_infop 1310 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1311 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_msa,(png_row_infop 1312 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1313 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_msa,(png_row_infop 1314 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1315 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_msa,(png_row_infop 1316 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1317 #endif 1318 1319 #if PNG_MIPS_MMI_IMPLEMENTATION > 0 1320 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_mmi,(png_row_infop row_info, 1321 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1322 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_mmi,(png_row_infop 1323 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1324 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_mmi,(png_row_infop 1325 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1326 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_mmi,(png_row_infop 1327 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1328 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_mmi,(png_row_infop 1329 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1330 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_mmi,(png_row_infop 1331 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1332 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_mmi,(png_row_infop 1333 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1334 #endif 1335 1336 #if PNG_POWERPC_VSX_OPT > 0 1337 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_vsx,(png_row_infop row_info, 1338 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1339 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_vsx,(png_row_infop 1340 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1341 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_vsx,(png_row_infop 1342 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1343 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_vsx,(png_row_infop 1344 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1345 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_vsx,(png_row_infop 1346 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1347 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_vsx,(png_row_infop 1348 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1349 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_vsx,(png_row_infop 1350 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1351 #endif 1352 1353 #if PNG_INTEL_SSE_IMPLEMENTATION > 0 1354 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_sse2,(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_sub4_sse2,(png_row_infop 1357 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1358 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_sse2,(png_row_infop 1359 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1360 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_sse2,(png_row_infop 1361 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1362 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_sse2,(png_row_infop 1363 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1364 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_sse2,(png_row_infop 1365 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1366 #endif 1367 1368 #if PNG_LOONGARCH_LSX_IMPLEMENTATION == 1 1369 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_lsx,(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_sub3_lsx,(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_sub4_lsx,(png_row_infop 1374 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1375 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_lsx,(png_row_infop 1376 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1377 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_lsx,(png_row_infop 1378 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1379 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_lsx,(png_row_infop 1380 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1381 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_lsx,(png_row_infop 1382 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1383 #endif 1384 1385 /* Choose the best filter to use and filter the row data */ 1386 PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr, 1387 png_row_infop row_info),PNG_EMPTY); 1388 1389 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED 1390 PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr, 1391 png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY); 1392 /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer 1393 * is NULL the function checks, instead, for the end of the stream. In this 1394 * case a benign error will be issued if the stream end is not found or if 1395 * extra data has to be consumed. 1396 */ 1397 PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr), 1398 PNG_EMPTY); 1399 /* This cleans up when the IDAT LZ stream does not end when the last image 1400 * byte is read; there is still some pending input. 1401 */ 1402 1403 PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr), 1404 PNG_EMPTY); 1405 /* Finish a row while reading, dealing with interlacing passes, etc. */ 1406 #endif /* SEQUENTIAL_READ */ 1407 1408 /* Initialize the row buffers, etc. */ 1409 PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY); 1410 1411 #if ZLIB_VERNUM >= 0x1240 1412 PNG_INTERNAL_FUNCTION(int,png_zlib_inflate,(png_structrp png_ptr, int flush), 1413 PNG_EMPTY); 1414 # define PNG_INFLATE(pp, flush) png_zlib_inflate(pp, flush) 1415 #else /* Zlib < 1.2.4 */ 1416 # define PNG_INFLATE(pp, flush) inflate(&(pp)->zstream, flush) 1417 #endif /* Zlib < 1.2.4 */ 1418 1419 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1420 /* Optional call to update the users info structure */ 1421 PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr, 1422 png_inforp info_ptr),PNG_EMPTY); 1423 #endif 1424 1425 /* Shared transform functions, defined in pngtran.c */ 1426 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 1427 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 1428 PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info, 1429 png_bytep row, int at_start),PNG_EMPTY); 1430 #endif 1431 1432 #ifdef PNG_16BIT_SUPPORTED 1433 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 1434 PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info, 1435 png_bytep row),PNG_EMPTY); 1436 #endif 1437 #endif 1438 1439 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ 1440 defined(PNG_WRITE_PACKSWAP_SUPPORTED) 1441 PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info, 1442 png_bytep row),PNG_EMPTY); 1443 #endif 1444 1445 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 1446 PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info, 1447 png_bytep row),PNG_EMPTY); 1448 #endif 1449 1450 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1451 PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info, 1452 png_bytep row),PNG_EMPTY); 1453 #endif 1454 1455 /* The following decodes the appropriate chunks, and does error correction, 1456 * then calls the appropriate callback for the chunk if it is valid. 1457 */ 1458 1459 /* Decode the IHDR chunk */ 1460 PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr, 1461 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1462 PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr, 1463 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1464 PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr, 1465 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1466 1467 #ifdef PNG_READ_bKGD_SUPPORTED 1468 PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr, 1469 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1470 #endif 1471 1472 #ifdef PNG_READ_cHRM_SUPPORTED 1473 PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr, 1474 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1475 #endif 1476 1477 #ifdef PNG_READ_eXIf_SUPPORTED 1478 PNG_INTERNAL_FUNCTION(void,png_handle_eXIf,(png_structrp png_ptr, 1479 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1480 #endif 1481 1482 #ifdef PNG_READ_gAMA_SUPPORTED 1483 PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr, 1484 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1485 #endif 1486 1487 #ifdef PNG_READ_hIST_SUPPORTED 1488 PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr, 1489 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1490 #endif 1491 1492 #ifdef PNG_READ_iCCP_SUPPORTED 1493 PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr, 1494 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1495 #endif /* READ_iCCP */ 1496 1497 #ifdef PNG_READ_iTXt_SUPPORTED 1498 PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr, 1499 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1500 #endif 1501 1502 #ifdef PNG_READ_oFFs_SUPPORTED 1503 PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr, 1504 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1505 #endif 1506 1507 #ifdef PNG_READ_pCAL_SUPPORTED 1508 PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr, 1509 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1510 #endif 1511 1512 #ifdef PNG_READ_pHYs_SUPPORTED 1513 PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr, 1514 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1515 #endif 1516 1517 #ifdef PNG_READ_sBIT_SUPPORTED 1518 PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr, 1519 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1520 #endif 1521 1522 #ifdef PNG_READ_sCAL_SUPPORTED 1523 PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr, 1524 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1525 #endif 1526 1527 #ifdef PNG_READ_sPLT_SUPPORTED 1528 PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr, 1529 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1530 #endif /* READ_sPLT */ 1531 1532 #ifdef PNG_READ_sRGB_SUPPORTED 1533 PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr, 1534 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1535 #endif 1536 1537 #ifdef PNG_READ_tEXt_SUPPORTED 1538 PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr, 1539 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1540 #endif 1541 1542 #ifdef PNG_READ_tIME_SUPPORTED 1543 PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr, 1544 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1545 #endif 1546 1547 #ifdef PNG_READ_tRNS_SUPPORTED 1548 PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr, 1549 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1550 #endif 1551 1552 #ifdef PNG_READ_zTXt_SUPPORTED 1553 PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr, 1554 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1555 #endif 1556 1557 PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_const_structrp png_ptr, 1558 png_uint_32 chunk_name),PNG_EMPTY); 1559 1560 PNG_INTERNAL_FUNCTION(void,png_check_chunk_length,(png_const_structrp png_ptr, 1561 png_uint_32 chunk_length),PNG_EMPTY); 1562 1563 PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr, 1564 png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY); 1565 /* This is the function that gets called for unknown chunks. The 'keep' 1566 * argument is either non-zero for a known chunk that has been set to be 1567 * handled as unknown or zero for an unknown chunk. By default the function 1568 * just skips the chunk or errors out if it is critical. 1569 */ 1570 1571 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\ 1572 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 1573 PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling, 1574 (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY); 1575 /* Exactly as the API png_handle_as_unknown() except that the argument is a 1576 * 32-bit chunk name, not a string. 1577 */ 1578 #endif /* READ_UNKNOWN_CHUNKS || HANDLE_AS_UNKNOWN */ 1579 1580 /* Handle the transformations for reading and writing */ 1581 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1582 PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr, 1583 png_row_infop row_info),PNG_EMPTY); 1584 #endif 1585 #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED 1586 PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr, 1587 png_row_infop row_info),PNG_EMPTY); 1588 #endif 1589 1590 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1591 PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr), 1592 PNG_EMPTY); 1593 #endif 1594 1595 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1596 PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr, 1597 png_inforp info_ptr),PNG_EMPTY); 1598 PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr, 1599 png_inforp info_ptr),PNG_EMPTY); 1600 PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY); 1601 PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr), 1602 PNG_EMPTY); 1603 PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr, 1604 png_bytep buffer, size_t buffer_length),PNG_EMPTY); 1605 PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY); 1606 PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr, 1607 png_bytep buffer, size_t buffer_length),PNG_EMPTY); 1608 PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr), 1609 PNG_EMPTY); 1610 PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr, 1611 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1612 PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr, 1613 png_inforp info_ptr),PNG_EMPTY); 1614 PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr, 1615 png_inforp info_ptr),PNG_EMPTY); 1616 PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr, 1617 png_bytep row),PNG_EMPTY); 1618 PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr, 1619 png_inforp info_ptr),PNG_EMPTY); 1620 PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr, 1621 png_inforp info_ptr),PNG_EMPTY); 1622 PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr), 1623 PNG_EMPTY); 1624 # ifdef PNG_READ_tEXt_SUPPORTED 1625 PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr, 1626 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1627 PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr, 1628 png_inforp info_ptr),PNG_EMPTY); 1629 # endif 1630 # ifdef PNG_READ_zTXt_SUPPORTED 1631 PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr, 1632 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1633 PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr, 1634 png_inforp info_ptr),PNG_EMPTY); 1635 # endif 1636 # ifdef PNG_READ_iTXt_SUPPORTED 1637 PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr, 1638 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1639 PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr, 1640 png_inforp info_ptr),PNG_EMPTY); 1641 # endif 1642 1643 #endif /* PROGRESSIVE_READ */ 1644 1645 /* Added at libpng version 1.6.0 */ 1646 #ifdef PNG_GAMMA_SUPPORTED 1647 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr, 1648 png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY); 1649 /* Set the colorspace gamma with a value provided by the application or by 1650 * the gAMA chunk on read. The value will override anything set by an ICC 1651 * profile. 1652 */ 1653 1654 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr, 1655 png_inforp info_ptr), PNG_EMPTY); 1656 /* Synchronize the info 'valid' flags with the colorspace */ 1657 1658 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr, 1659 png_inforp info_ptr), PNG_EMPTY); 1660 /* Copy the png_struct colorspace to the info_struct and call the above to 1661 * synchronize the flags. Checks for NULL info_ptr and does nothing. 1662 */ 1663 #endif 1664 1665 /* Added at libpng version 1.4.0 */ 1666 #ifdef PNG_COLORSPACE_SUPPORTED 1667 /* These internal functions are for maintaining the colorspace structure within 1668 * a png_info or png_struct (or, indeed, both). 1669 */ 1670 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities, 1671 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy, 1672 int preferred), PNG_EMPTY); 1673 1674 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints, 1675 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ, 1676 int preferred), PNG_EMPTY); 1677 1678 #ifdef PNG_sRGB_SUPPORTED 1679 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr, 1680 png_colorspacerp colorspace, int intent), PNG_EMPTY); 1681 /* This does set the colorspace gAMA and cHRM values too, but doesn't set the 1682 * flags to write them, if it returns false there was a problem and an error 1683 * message has already been output (but the colorspace may still need to be 1684 * synced to record the invalid flag). 1685 */ 1686 #endif /* sRGB */ 1687 1688 #ifdef PNG_iCCP_SUPPORTED 1689 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr, 1690 png_colorspacerp colorspace, png_const_charp name, 1691 png_uint_32 profile_length, png_const_bytep profile, int color_type), 1692 PNG_EMPTY); 1693 /* The 'name' is used for information only */ 1694 1695 /* Routines for checking parts of an ICC profile. */ 1696 #ifdef PNG_READ_iCCP_SUPPORTED 1697 PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr, 1698 png_colorspacerp colorspace, png_const_charp name, 1699 png_uint_32 profile_length), PNG_EMPTY); 1700 #endif /* READ_iCCP */ 1701 PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr, 1702 png_colorspacerp colorspace, png_const_charp name, 1703 png_uint_32 profile_length, 1704 png_const_bytep profile /* first 132 bytes only */, int color_type), 1705 PNG_EMPTY); 1706 PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr, 1707 png_colorspacerp colorspace, png_const_charp name, 1708 png_uint_32 profile_length, 1709 png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY); 1710 #ifdef PNG_sRGB_SUPPORTED 1711 PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,( 1712 png_const_structrp png_ptr, png_colorspacerp colorspace, 1713 png_const_bytep profile, uLong adler), PNG_EMPTY); 1714 /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may 1715 * be zero to indicate that it is not available. It is used, if provided, 1716 * as a fast check on the profile when checking to see if it is sRGB. 1717 */ 1718 #endif 1719 #endif /* iCCP */ 1720 1721 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1722 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients, 1723 (png_structrp png_ptr), PNG_EMPTY); 1724 /* Set the rgb_to_gray coefficients from the colorspace Y values */ 1725 #endif /* READ_RGB_TO_GRAY */ 1726 #endif /* COLORSPACE */ 1727 1728 /* Added at libpng version 1.4.0 */ 1729 PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr, 1730 png_uint_32 width, png_uint_32 height, int bit_depth, 1731 int color_type, int interlace_type, int compression_type, 1732 int filter_type),PNG_EMPTY); 1733 1734 /* Added at libpng version 1.5.10 */ 1735 #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \ 1736 defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED) 1737 PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes, 1738 (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY); 1739 #endif 1740 1741 #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) 1742 PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr, 1743 png_const_charp name),PNG_NORETURN); 1744 #endif 1745 1746 /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite 1747 * the end. Always leaves the buffer nul terminated. Never errors out (and 1748 * there is no error code.) 1749 */ 1750 PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize, 1751 size_t pos, png_const_charp string),PNG_EMPTY); 1752 1753 /* Various internal functions to handle formatted warning messages, currently 1754 * only implemented for warnings. 1755 */ 1756 #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) 1757 /* Utility to dump an unsigned value into a buffer, given a start pointer and 1758 * and end pointer (which should point just *beyond* the end of the buffer!) 1759 * Returns the pointer to the start of the formatted string. This utility only 1760 * does unsigned values. 1761 */ 1762 PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start, 1763 png_charp end, int format, png_alloc_size_t number),PNG_EMPTY); 1764 1765 /* Convenience macro that takes an array: */ 1766 #define PNG_FORMAT_NUMBER(buffer,format,number) \ 1767 png_format_number(buffer, buffer + (sizeof buffer), format, number) 1768 1769 /* Suggested size for a number buffer (enough for 64 bits and a sign!) */ 1770 #define PNG_NUMBER_BUFFER_SIZE 24 1771 1772 /* These are the integer formats currently supported, the name is formed from 1773 * the standard printf(3) format string. 1774 */ 1775 #define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */ 1776 #define PNG_NUMBER_FORMAT_02u 2 1777 #define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */ 1778 #define PNG_NUMBER_FORMAT_02d 2 1779 #define PNG_NUMBER_FORMAT_x 3 1780 #define PNG_NUMBER_FORMAT_02x 4 1781 #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */ 1782 #endif 1783 1784 #ifdef PNG_WARNINGS_SUPPORTED 1785 /* New defines and members adding in libpng-1.5.4 */ 1786 # define PNG_WARNING_PARAMETER_SIZE 32 1787 # define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */ 1788 1789 /* An l-value of this type has to be passed to the APIs below to cache the 1790 * values of the parameters to a formatted warning message. 1791 */ 1792 typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][ 1793 PNG_WARNING_PARAMETER_SIZE]; 1794 1795 PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p, 1796 int number, png_const_charp string),PNG_EMPTY); 1797 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters, 1798 * including the trailing '\0'. 1799 */ 1800 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned, 1801 (png_warning_parameters p, int number, int format, png_alloc_size_t value), 1802 PNG_EMPTY); 1803 /* Use png_alloc_size_t because it is an unsigned type as big as any we 1804 * need to output. Use the following for a signed value. 1805 */ 1806 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed, 1807 (png_warning_parameters p, int number, int format, png_int_32 value), 1808 PNG_EMPTY); 1809 1810 PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr, 1811 png_warning_parameters p, png_const_charp message),PNG_EMPTY); 1812 /* 'message' follows the X/Open approach of using @1, @2 to insert 1813 * parameters previously supplied using the above functions. Errors in 1814 * specifying the parameters will simply result in garbage substitutions. 1815 */ 1816 #endif 1817 1818 #ifdef PNG_BENIGN_ERRORS_SUPPORTED 1819 /* Application errors (new in 1.6); use these functions (declared below) for 1820 * errors in the parameters or order of API function calls on read. The 1821 * 'warning' should be used for an error that can be handled completely; the 1822 * 'error' for one which can be handled safely but which may lose application 1823 * information or settings. 1824 * 1825 * By default these both result in a png_error call prior to release, while in a 1826 * released version the 'warning' is just a warning. However if the application 1827 * explicitly disables benign errors (explicitly permitting the code to lose 1828 * information) they both turn into warnings. 1829 * 1830 * If benign errors aren't supported they end up as the corresponding base call 1831 * (png_warning or png_error.) 1832 */ 1833 PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr, 1834 png_const_charp message),PNG_EMPTY); 1835 /* The application provided invalid parameters to an API function or called 1836 * an API function at the wrong time, libpng can completely recover. 1837 */ 1838 1839 PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr, 1840 png_const_charp message),PNG_EMPTY); 1841 /* As above but libpng will ignore the call, or attempt some other partial 1842 * recovery from the error. 1843 */ 1844 #else 1845 # define png_app_warning(pp,s) png_warning(pp,s) 1846 # define png_app_error(pp,s) png_error(pp,s) 1847 #endif 1848 1849 PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr, 1850 png_const_charp message, int error),PNG_EMPTY); 1851 /* Report a recoverable issue in chunk data. On read this is used to report 1852 * a problem found while reading a particular chunk and the 1853 * png_chunk_benign_error or png_chunk_warning function is used as 1854 * appropriate. On write this is used to report an error that comes from 1855 * data set via an application call to a png_set_ API and png_app_error or 1856 * png_app_warning is used as appropriate. 1857 * 1858 * The 'error' parameter must have one of the following values: 1859 */ 1860 #define PNG_CHUNK_WARNING 0 /* never an error */ 1861 #define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */ 1862 #define PNG_CHUNK_ERROR 2 /* always an error */ 1863 1864 /* ASCII to FP interfaces, currently only implemented if sCAL 1865 * support is required. 1866 */ 1867 #if defined(PNG_sCAL_SUPPORTED) 1868 /* MAX_DIGITS is actually the maximum number of characters in an sCAL 1869 * width or height, derived from the precision (number of significant 1870 * digits - a build time settable option) and assumptions about the 1871 * maximum ridiculous exponent. 1872 */ 1873 #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/) 1874 1875 #ifdef PNG_FLOATING_POINT_SUPPORTED 1876 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr, 1877 png_charp ascii, size_t size, double fp, unsigned int precision), 1878 PNG_EMPTY); 1879 #endif /* FLOATING_POINT */ 1880 1881 #ifdef PNG_FIXED_POINT_SUPPORTED 1882 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr, 1883 png_charp ascii, size_t size, png_fixed_point fp),PNG_EMPTY); 1884 #endif /* FIXED_POINT */ 1885 #endif /* sCAL */ 1886 1887 #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) 1888 /* An internal API to validate the format of a floating point number. 1889 * The result is the index of the next character. If the number is 1890 * not valid it will be the index of a character in the supposed number. 1891 * 1892 * The format of a number is defined in the PNG extensions specification 1893 * and this API is strictly conformant to that spec, not anyone elses! 1894 * 1895 * The format as a regular expression is: 1896 * 1897 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)? 1898 * 1899 * or: 1900 * 1901 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)? 1902 * 1903 * The complexity is that either integer or fraction must be present and the 1904 * fraction is permitted to have no digits only if the integer is present. 1905 * 1906 * NOTE: The dangling E problem. 1907 * There is a PNG valid floating point number in the following: 1908 * 1909 * PNG floating point numbers are not greedy. 1910 * 1911 * Working this out requires *TWO* character lookahead (because of the 1912 * sign), the parser does not do this - it will fail at the 'r' - this 1913 * doesn't matter for PNG sCAL chunk values, but it requires more care 1914 * if the value were ever to be embedded in something more complex. Use 1915 * ANSI-C strtod if you need the lookahead. 1916 */ 1917 /* State table for the parser. */ 1918 #define PNG_FP_INTEGER 0 /* before or in integer */ 1919 #define PNG_FP_FRACTION 1 /* before or in fraction */ 1920 #define PNG_FP_EXPONENT 2 /* before or in exponent */ 1921 #define PNG_FP_STATE 3 /* mask for the above */ 1922 #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */ 1923 #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */ 1924 #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */ 1925 #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */ 1926 #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */ 1927 1928 /* These three values don't affect the parser. They are set but not used. 1929 */ 1930 #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */ 1931 #define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */ 1932 #define PNG_FP_NONZERO 256 /* A non-zero value */ 1933 #define PNG_FP_STICKY 448 /* The above three flags */ 1934 1935 /* This is available for the caller to store in 'state' if required. Do not 1936 * call the parser after setting it (the parser sometimes clears it.) 1937 */ 1938 #define PNG_FP_INVALID 512 /* Available for callers as a distinct value */ 1939 1940 /* Result codes for the parser (boolean - true means ok, false means 1941 * not ok yet.) 1942 */ 1943 #define PNG_FP_MAYBE 0 /* The number may be valid in the future */ 1944 #define PNG_FP_OK 1 /* The number is valid */ 1945 1946 /* Tests on the sticky non-zero and negative flags. To pass these checks 1947 * the state must also indicate that the whole number is valid - this is 1948 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this 1949 * is equivalent to PNG_FP_OK above.) 1950 */ 1951 #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO) 1952 /* NZ_MASK: the string is valid and a non-zero negative value */ 1953 #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO) 1954 /* Z MASK: the string is valid and a non-zero value. */ 1955 /* PNG_FP_SAW_DIGIT: the string is valid. */ 1956 #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT) 1957 #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK) 1958 #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK) 1959 1960 /* The actual parser. This can be called repeatedly. It updates 1961 * the index into the string and the state variable (which must 1962 * be initialized to 0). It returns a result code, as above. There 1963 * is no point calling the parser any more if it fails to advance to 1964 * the end of the string - it is stuck on an invalid character (or 1965 * terminated by '\0'). 1966 * 1967 * Note that the pointer will consume an E or even an E+ and then leave 1968 * a 'maybe' state even though a preceding integer.fraction is valid. 1969 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was 1970 * a valid number. It's possible to recover from this by calling 1971 * the parser again (from the start, with state 0) but with a string 1972 * that omits the last character (i.e. set the size to the index of 1973 * the problem character.) This has not been tested within libpng. 1974 */ 1975 PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string, 1976 size_t size, int *statep, size_t *whereami),PNG_EMPTY); 1977 1978 /* This is the same but it checks a complete string and returns true 1979 * only if it just contains a floating point number. As of 1.5.4 this 1980 * function also returns the state at the end of parsing the number if 1981 * it was valid (otherwise it returns 0.) This can be used for testing 1982 * for negative or zero values using the sticky flag. 1983 */ 1984 PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string, 1985 size_t size),PNG_EMPTY); 1986 #endif /* pCAL || sCAL */ 1987 1988 #if defined(PNG_GAMMA_SUPPORTED) ||\ 1989 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED) 1990 /* Added at libpng version 1.5.0 */ 1991 /* This is a utility to provide a*times/div (rounded) and indicate 1992 * if there is an overflow. The result is a boolean - false (0) 1993 * for overflow, true (1) if no overflow, in which case *res 1994 * holds the result. 1995 */ 1996 PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a, 1997 png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY); 1998 #endif 1999 2000 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED) 2001 /* Same deal, but issue a warning on overflow and return 0. */ 2002 PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn, 2003 (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by, 2004 png_int_32 divided_by),PNG_EMPTY); 2005 #endif 2006 2007 #ifdef PNG_GAMMA_SUPPORTED 2008 /* Calculate a reciprocal - used for gamma values. This returns 2009 * 0 if the argument is 0 in order to maintain an undefined value; 2010 * there are no warnings. 2011 */ 2012 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a), 2013 PNG_EMPTY); 2014 2015 #ifdef PNG_READ_GAMMA_SUPPORTED 2016 /* The same but gives a reciprocal of the product of two fixed point 2017 * values. Accuracy is suitable for gamma calculations but this is 2018 * not exact - use png_muldiv for that. Only required at present on read. 2019 */ 2020 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a, 2021 png_fixed_point b),PNG_EMPTY); 2022 #endif 2023 2024 /* Return true if the gamma value is significantly different from 1.0 */ 2025 PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value), 2026 PNG_EMPTY); 2027 #endif 2028 2029 #ifdef PNG_READ_GAMMA_SUPPORTED 2030 /* Internal fixed point gamma correction. These APIs are called as 2031 * required to convert single values - they don't need to be fast, 2032 * they are not used when processing image pixel values. 2033 * 2034 * While the input is an 'unsigned' value it must actually be the 2035 * correct bit value - 0..255 or 0..65535 as required. 2036 */ 2037 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr, 2038 unsigned int value, png_fixed_point gamma_value),PNG_EMPTY); 2039 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value, 2040 png_fixed_point gamma_value),PNG_EMPTY); 2041 PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value, 2042 png_fixed_point gamma_value),PNG_EMPTY); 2043 PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr), 2044 PNG_EMPTY); 2045 PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr, 2046 int bit_depth),PNG_EMPTY); 2047 #endif 2048 2049 /* SIMPLIFIED READ/WRITE SUPPORT */ 2050 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 2051 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 2052 /* The internal structure that png_image::opaque points to. */ 2053 typedef struct png_control 2054 { 2055 png_structp png_ptr; 2056 png_infop info_ptr; 2057 png_voidp error_buf; /* Always a jmp_buf at present. */ 2058 2059 png_const_bytep memory; /* Memory buffer. */ 2060 size_t size; /* Size of the memory buffer. */ 2061 2062 unsigned int for_write :1; /* Otherwise it is a read structure */ 2063 unsigned int owned_file :1; /* We own the file in io_ptr */ 2064 } png_control; 2065 2066 /* Return the pointer to the jmp_buf from a png_control: necessary because C 2067 * does not reveal the type of the elements of jmp_buf. 2068 */ 2069 #ifdef __cplusplus 2070 # define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0]) 2071 #else 2072 # define png_control_jmp_buf(pc) ((pc)->error_buf) 2073 #endif 2074 2075 /* Utility to safely execute a piece of libpng code catching and logging any 2076 * errors that might occur. Returns true on success, false on failure (either 2077 * of the function or as a result of a png_error.) 2078 */ 2079 PNG_INTERNAL_CALLBACK(void,png_safe_error,(png_structp png_ptr, 2080 png_const_charp error_message),PNG_NORETURN); 2081 2082 #ifdef PNG_WARNINGS_SUPPORTED 2083 PNG_INTERNAL_CALLBACK(void,png_safe_warning,(png_structp png_ptr, 2084 png_const_charp warning_message),PNG_EMPTY); 2085 #else 2086 # define png_safe_warning 0/*dummy argument*/ 2087 #endif 2088 2089 PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image, 2090 int (*function)(png_voidp), png_voidp arg),PNG_EMPTY); 2091 2092 /* Utility to log an error; this also cleans up the png_image; the function 2093 * always returns 0 (false). 2094 */ 2095 PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image, 2096 png_const_charp error_message),PNG_EMPTY); 2097 2098 #ifndef PNG_SIMPLIFIED_READ_SUPPORTED 2099 /* png_image_free is used by the write code but not exported */ 2100 PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY); 2101 #endif /* !SIMPLIFIED_READ */ 2102 2103 #endif /* SIMPLIFIED READ/WRITE */ 2104 2105 /* These are initialization functions for hardware specific PNG filter 2106 * optimizations; list these here then select the appropriate one at compile 2107 * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined 2108 * the generic code is used. 2109 */ 2110 #ifdef PNG_FILTER_OPTIMIZATIONS 2111 PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr, 2112 unsigned int bpp), PNG_EMPTY); 2113 /* Just declare the optimization that will be used */ 2114 #else 2115 /* List *all* the possible optimizations here - this branch is required if 2116 * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in 2117 * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing. 2118 */ 2119 # if PNG_ARM_NEON_OPT > 0 2120 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon, 2121 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2122 #endif 2123 2124 #if PNG_MIPS_MSA_IMPLEMENTATION == 1 2125 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_mips, 2126 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2127 #endif 2128 2129 # if PNG_MIPS_MMI_IMPLEMENTATION > 0 2130 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_mips, 2131 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2132 # endif 2133 2134 # if PNG_INTEL_SSE_IMPLEMENTATION > 0 2135 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_sse2, 2136 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2137 # endif 2138 #endif 2139 2140 #if PNG_LOONGARCH_LSX_OPT > 0 2141 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_lsx, 2142 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2143 #endif 2144 2145 PNG_INTERNAL_FUNCTION(png_uint_32, png_check_keyword, (png_structrp png_ptr, 2146 png_const_charp key, png_bytep new_key), PNG_EMPTY); 2147 2148 #if PNG_ARM_NEON_IMPLEMENTATION == 1 2149 PNG_INTERNAL_FUNCTION(void, 2150 png_riffle_palette_neon, 2151 (png_structrp), 2152 PNG_EMPTY); 2153 PNG_INTERNAL_FUNCTION(int, 2154 png_do_expand_palette_rgba8_neon, 2155 (png_structrp, 2156 png_row_infop, 2157 png_const_bytep, 2158 const png_bytepp, 2159 const png_bytepp), 2160 PNG_EMPTY); 2161 PNG_INTERNAL_FUNCTION(int, 2162 png_do_expand_palette_rgb8_neon, 2163 (png_structrp, 2164 png_row_infop, 2165 png_const_bytep, 2166 const png_bytepp, 2167 const png_bytepp), 2168 PNG_EMPTY); 2169 #endif 2170 2171 /* Maintainer: Put new private prototypes here ^ */ 2172 2173 #include "pngdebug.h" 2174 2175 #ifdef __cplusplus 2176 } 2177 #endif 2178 2179 #endif /* PNG_VERSION_INFO_ONLY */ 2180 #endif /* PNGPRIV_H */ 2181