1 2 /* pngpriv.h - private declarations for use inside libpng 3 * 4 * Copyright (c) 2018-2019 Cosmin Truta 5 * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson 6 * Copyright (c) 1996-1997 Andreas Dilger 7 * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc. 8 * 9 * This code is released under the libpng license. 10 * For conditions of distribution and use, see the disclaimer 11 * and license in png.h 12 */ 13 14 /* The symbols declared in this file (including the functions declared 15 * as extern) are PRIVATE. They are not part of the libpng public 16 * interface, and are not recommended for use by regular applications. 17 * Some of them may become public in the future; others may stay private, 18 * change in an incompatible way, or even disappear. 19 * Although the libpng users are not forbidden to include this header, 20 * they should be well aware of the issues that may arise from doing so. 21 */ 22 23 #ifndef PNGPRIV_H 24 #define PNGPRIV_H 25 26 /* Feature Test Macros. The following are defined here to ensure that correctly 27 * implemented libraries reveal the APIs libpng needs to build and hide those 28 * that are not needed and potentially damaging to the compilation. 29 * 30 * Feature Test Macros must be defined before any system header is included (see 31 * POSIX 1003.1 2.8.2 "POSIX Symbols." 32 * 33 * These macros only have an effect if the operating system supports either 34 * POSIX 1003.1 or C99, or both. On other operating systems (particularly 35 * Windows/Visual Studio) there is no effect; the OS specific tests below are 36 * still required (as of 2011-05-02.) 37 */ 38 #ifndef _POSIX_SOURCE 39 # define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */ 40 #endif 41 42 #ifndef PNG_VERSION_INFO_ONLY 43 /* Standard library headers not required by png.h: */ 44 # include <stdlib.h> 45 # include <string.h> 46 #endif 47 48 #define PNGLIB_BUILD /*libpng is being built, not used*/ 49 50 /* If HAVE_CONFIG_H is defined during the build then the build system must 51 * provide an appropriate "config.h" file on the include path. The header file 52 * must provide definitions as required below (search for "HAVE_CONFIG_H"); 53 * see configure.ac for more details of the requirements. The macro 54 * "PNG_NO_CONFIG_H" is provided for maintainers to test for dependencies on 55 * 'configure'; define this macro to prevent the configure build including the 56 * configure generated config.h. Libpng is expected to compile without *any* 57 * special build system support on a reasonably ANSI-C compliant system. 58 */ 59 #if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H) 60 # include <config.h> 61 62 /* Pick up the definition of 'restrict' from config.h if it was read: */ 63 # define PNG_RESTRICT restrict 64 #endif 65 66 /* To support symbol prefixing it is necessary to know *before* including png.h 67 * whether the fixed point (and maybe other) APIs are exported, because if they 68 * are not internal definitions may be required. This is handled below just 69 * before png.h is included, but load the configuration now if it is available. 70 */ 71 #ifndef PNGLCONF_H 72 # include "pnglibconf.h" 73 #endif 74 75 /* Local renames may change non-exported API functions from png.h */ 76 #if defined(PNG_PREFIX) && !defined(PNGPREFIX_H) 77 # include "pngprefix.h" 78 #endif 79 80 #ifdef PNG_USER_CONFIG 81 # include "pngusr.h" 82 /* These should have been defined in pngusr.h */ 83 # ifndef PNG_USER_PRIVATEBUILD 84 # define PNG_USER_PRIVATEBUILD "Custom libpng build" 85 # endif 86 # ifndef PNG_USER_DLLFNAME_POSTFIX 87 # define PNG_USER_DLLFNAME_POSTFIX "Cb" 88 # endif 89 #endif 90 91 /* Compile time options. 92 * ===================== 93 * In a multi-arch build the compiler may compile the code several times for the 94 * same object module, producing different binaries for different architectures. 95 * When this happens configure-time setting of the target host options cannot be 96 * done and this interferes with the handling of the ARM NEON optimizations, and 97 * possibly other similar optimizations. Put additional tests here; in general 98 * this is needed when the same option can be changed at both compile time and 99 * run time depending on the target OS (i.e. iOS vs Android.) 100 * 101 * NOTE: symbol prefixing does not pass $(CFLAGS) to the preprocessor, because 102 * this is not possible with certain compilers (Oracle SUN OS CC), as a result 103 * it is necessary to ensure that all extern functions that *might* be used 104 * regardless of $(CFLAGS) get declared in this file. The test on __ARM_NEON__ 105 * below is one example of this behavior because it is controlled by the 106 * presence or not of -mfpu=neon on the GCC command line, it is possible to do 107 * this in $(CC), e.g. "CC=gcc -mfpu=neon", but people who build libpng rarely 108 * do this. 109 */ 110 #ifndef PNG_ARM_NEON_OPT 111 /* ARM NEON optimizations are being controlled by the compiler settings, 112 * typically the target FPU. If the FPU has been set to NEON (-mfpu=neon 113 * with GCC) then the compiler will define __ARM_NEON__ and we can rely 114 * unconditionally on NEON instructions not crashing, otherwise we must 115 * disable use of NEON instructions. 116 * 117 * NOTE: at present these optimizations depend on 'ALIGNED_MEMORY', so they 118 * can only be turned on automatically if that is supported too. If 119 * PNG_ARM_NEON_OPT is set in CPPFLAGS (to >0) then arm/arm_init.c will fail 120 * to compile with an appropriate #error if ALIGNED_MEMORY has been turned 121 * off. 122 * 123 * Note that gcc-4.9 defines __ARM_NEON instead of the deprecated 124 * __ARM_NEON__, so we check both variants. 125 * 126 * To disable ARM_NEON optimizations entirely, and skip compiling the 127 * associated assembler code, pass --enable-arm-neon=no to configure 128 * or put -DPNG_ARM_NEON_OPT=0 in CPPFLAGS. 129 */ 130 # if (defined(__ARM_NEON__) || defined(__ARM_NEON)) && \ 131 defined(PNG_ALIGNED_MEMORY_SUPPORTED) 132 # define PNG_ARM_NEON_OPT 2 133 # else 134 # define PNG_ARM_NEON_OPT 0 135 # endif 136 #endif 137 138 #if PNG_ARM_NEON_OPT > 0 139 /* NEON optimizations are to be at least considered by libpng, so enable the 140 * callbacks to do this. 141 */ 142 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_neon 143 144 /* By default the 'intrinsics' code in arm/filter_neon_intrinsics.c is used 145 * if possible - if __ARM_NEON__ is set and the compiler version is not known 146 * to be broken. This is controlled by PNG_ARM_NEON_IMPLEMENTATION which can 147 * be: 148 * 149 * 1 The intrinsics code (the default with __ARM_NEON__) 150 * 2 The hand coded assembler (the default without __ARM_NEON__) 151 * 152 * It is possible to set PNG_ARM_NEON_IMPLEMENTATION in CPPFLAGS, however 153 * this is *NOT* supported and may cease to work even after a minor revision 154 * to libpng. It *is* valid to do this for testing purposes, e.g. speed 155 * testing or a new compiler, but the results should be communicated to the 156 * libpng implementation list for incorporation in the next minor release. 157 */ 158 # ifndef PNG_ARM_NEON_IMPLEMENTATION 159 # if defined(__ARM_NEON__) || defined(__ARM_NEON) 160 # if defined(__clang__) 161 /* At present it is unknown by the libpng developers which versions 162 * of clang support the intrinsics, however some or perhaps all 163 * versions do not work with the assembler so this may be 164 * irrelevant, so just use the default (do nothing here.) 165 */ 166 # elif defined(__GNUC__) 167 /* GCC 4.5.4 NEON support is known to be broken. 4.6.3 is known to 168 * work, so if this *is* GCC, or G++, look for a version >4.5 169 */ 170 # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6) 171 # define PNG_ARM_NEON_IMPLEMENTATION 2 172 # endif /* no GNUC support */ 173 # endif /* __GNUC__ */ 174 # else /* !defined __ARM_NEON__ */ 175 /* The 'intrinsics' code simply won't compile without this -mfpu=neon: 176 */ 177 # if !defined(__aarch64__) 178 /* The assembler code currently does not work on ARM64 */ 179 # define PNG_ARM_NEON_IMPLEMENTATION 2 180 # endif /* __aarch64__ */ 181 # endif /* __ARM_NEON__ */ 182 # endif /* !PNG_ARM_NEON_IMPLEMENTATION */ 183 184 # ifndef PNG_ARM_NEON_IMPLEMENTATION 185 /* Use the intrinsics code by default. */ 186 # define PNG_ARM_NEON_IMPLEMENTATION 1 187 # endif 188 #endif /* PNG_ARM_NEON_OPT > 0 */ 189 190 #ifndef PNG_MIPS_MSA_OPT 191 # if defined(__mips_msa) && (__mips_isa_rev >= 5) && defined(PNG_ALIGNED_MEMORY_SUPPORTED) 192 # define PNG_MIPS_MSA_OPT 2 193 # else 194 # define PNG_MIPS_MSA_OPT 0 195 # endif 196 #endif 197 198 #ifndef PNG_POWERPC_VSX_OPT 199 # if defined(__PPC64__) && defined(__ALTIVEC__) && defined(__VSX__) 200 # define PNG_POWERPC_VSX_OPT 2 201 # else 202 # define PNG_POWERPC_VSX_OPT 0 203 # endif 204 #endif 205 206 #ifndef PNG_INTEL_SSE_OPT 207 # ifdef PNG_INTEL_SSE 208 /* Only check for SSE if the build configuration has been modified to 209 * enable SSE optimizations. This means that these optimizations will 210 * be off by default. See contrib/intel for more details. 211 */ 212 # if defined(__SSE4_1__) || defined(__AVX__) || defined(__SSSE3__) || \ 213 defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \ 214 (defined(_M_IX86_FP) && _M_IX86_FP >= 2) 215 # define PNG_INTEL_SSE_OPT 1 216 # else 217 # define PNG_INTEL_SSE_OPT 0 218 # endif 219 # else 220 # define PNG_INTEL_SSE_OPT 0 221 # endif 222 #endif 223 224 #if PNG_INTEL_SSE_OPT > 0 225 # ifndef PNG_INTEL_SSE_IMPLEMENTATION 226 # if defined(__SSE4_1__) || defined(__AVX__) 227 /* We are not actually using AVX, but checking for AVX is the best 228 way we can detect SSE4.1 and SSSE3 on MSVC. 229 */ 230 # define PNG_INTEL_SSE_IMPLEMENTATION 3 231 # elif defined(__SSSE3__) 232 # define PNG_INTEL_SSE_IMPLEMENTATION 2 233 # elif defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \ 234 (defined(_M_IX86_FP) && _M_IX86_FP >= 2) 235 # define PNG_INTEL_SSE_IMPLEMENTATION 1 236 # else 237 # define PNG_INTEL_SSE_IMPLEMENTATION 0 238 # endif 239 # endif 240 241 # if PNG_INTEL_SSE_IMPLEMENTATION > 0 242 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_sse2 243 # endif 244 #else 245 # define PNG_INTEL_SSE_IMPLEMENTATION 0 246 #endif 247 248 #if PNG_MIPS_MSA_OPT > 0 249 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_msa 250 # ifndef PNG_MIPS_MSA_IMPLEMENTATION 251 # if defined(__mips_msa) 252 # if defined(__clang__) 253 # elif defined(__GNUC__) 254 # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7) 255 # define PNG_MIPS_MSA_IMPLEMENTATION 2 256 # endif /* no GNUC support */ 257 # endif /* __GNUC__ */ 258 # else /* !defined __mips_msa */ 259 # define PNG_MIPS_MSA_IMPLEMENTATION 2 260 # endif /* __mips_msa */ 261 # endif /* !PNG_MIPS_MSA_IMPLEMENTATION */ 262 263 # ifndef PNG_MIPS_MSA_IMPLEMENTATION 264 # define PNG_MIPS_MSA_IMPLEMENTATION 1 265 # endif 266 #endif /* PNG_MIPS_MSA_OPT > 0 */ 267 268 #if PNG_POWERPC_VSX_OPT > 0 269 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_vsx 270 # define PNG_POWERPC_VSX_IMPLEMENTATION 1 271 #endif 272 273 274 /* Is this a build of a DLL where compilation of the object modules requires 275 * different preprocessor settings to those required for a simple library? If 276 * so PNG_BUILD_DLL must be set. 277 * 278 * If libpng is used inside a DLL but that DLL does not export the libpng APIs 279 * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a 280 * static library of libpng then link the DLL against that. 281 */ 282 #ifndef PNG_BUILD_DLL 283 # ifdef DLL_EXPORT 284 /* This is set by libtool when files are compiled for a DLL; libtool 285 * always compiles twice, even on systems where it isn't necessary. Set 286 * PNG_BUILD_DLL in case it is necessary: 287 */ 288 # define PNG_BUILD_DLL 289 # else 290 # ifdef _WINDLL 291 /* This is set by the Microsoft Visual Studio IDE in projects that 292 * build a DLL. It can't easily be removed from those projects (it 293 * isn't visible in the Visual Studio UI) so it is a fairly reliable 294 * indication that PNG_IMPEXP needs to be set to the DLL export 295 * attributes. 296 */ 297 # define PNG_BUILD_DLL 298 # else 299 # ifdef __DLL__ 300 /* This is set by the Borland C system when compiling for a DLL 301 * (as above.) 302 */ 303 # define PNG_BUILD_DLL 304 # else 305 /* Add additional compiler cases here. */ 306 # endif 307 # endif 308 # endif 309 #endif /* Setting PNG_BUILD_DLL if required */ 310 311 /* See pngconf.h for more details: the builder of the library may set this on 312 * the command line to the right thing for the specific compilation system or it 313 * may be automagically set above (at present we know of no system where it does 314 * need to be set on the command line.) 315 * 316 * PNG_IMPEXP must be set here when building the library to prevent pngconf.h 317 * setting it to the "import" setting for a DLL build. 318 */ 319 #ifndef PNG_IMPEXP 320 # ifdef PNG_BUILD_DLL 321 # define PNG_IMPEXP PNG_DLL_EXPORT 322 # else 323 /* Not building a DLL, or the DLL doesn't require specific export 324 * definitions. 325 */ 326 # define PNG_IMPEXP 327 # endif 328 #endif 329 330 /* No warnings for private or deprecated functions in the build: */ 331 #ifndef PNG_DEPRECATED 332 # define PNG_DEPRECATED 333 #endif 334 #ifndef PNG_PRIVATE 335 # define PNG_PRIVATE 336 #endif 337 338 /* Symbol preprocessing support. 339 * 340 * To enable listing global, but internal, symbols the following macros should 341 * always be used to declare an extern data or function object in this file. 342 */ 343 #ifndef PNG_INTERNAL_DATA 344 # define PNG_INTERNAL_DATA(type, name, array) PNG_LINKAGE_DATA type name array 345 #endif 346 347 #ifndef PNG_INTERNAL_FUNCTION 348 # define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\ 349 PNG_LINKAGE_FUNCTION PNG_FUNCTION(type, name, args, PNG_EMPTY attributes) 350 #endif 351 352 #ifndef PNG_INTERNAL_CALLBACK 353 # define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\ 354 PNG_LINKAGE_CALLBACK PNG_FUNCTION(type, (PNGCBAPI name), args,\ 355 PNG_EMPTY attributes) 356 #endif 357 358 /* If floating or fixed point APIs are disabled they may still be compiled 359 * internally. To handle this make sure they are declared as the appropriate 360 * internal extern function (otherwise the symbol prefixing stuff won't work and 361 * the functions will be used without definitions.) 362 * 363 * NOTE: although all the API functions are declared here they are not all 364 * actually built! Because the declarations are still made it is necessary to 365 * fake out types that they depend on. 366 */ 367 #ifndef PNG_FP_EXPORT 368 # ifndef PNG_FLOATING_POINT_SUPPORTED 369 # define PNG_FP_EXPORT(ordinal, type, name, args)\ 370 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 371 # ifndef PNG_VERSION_INFO_ONLY 372 typedef struct png_incomplete png_double; 373 typedef png_double* png_doublep; 374 typedef const png_double* png_const_doublep; 375 typedef png_double** png_doublepp; 376 # endif 377 # endif 378 #endif 379 #ifndef PNG_FIXED_EXPORT 380 # ifndef PNG_FIXED_POINT_SUPPORTED 381 # define PNG_FIXED_EXPORT(ordinal, type, name, args)\ 382 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 383 # endif 384 #endif 385 386 #include "png.h" 387 388 /* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */ 389 #ifndef PNG_DLL_EXPORT 390 # define PNG_DLL_EXPORT 391 #endif 392 393 /* This is a global switch to set the compilation for an installed system 394 * (a release build). It can be set for testing debug builds to ensure that 395 * they will compile when the build type is switched to RC or STABLE, the 396 * default is just to use PNG_LIBPNG_BUILD_BASE_TYPE. Set this in CPPFLAGS 397 * with either: 398 * 399 * -DPNG_RELEASE_BUILD Turns on the release compile path 400 * -DPNG_RELEASE_BUILD=0 Turns it off 401 * or in your pngusr.h with 402 * #define PNG_RELEASE_BUILD=1 Turns on the release compile path 403 * #define PNG_RELEASE_BUILD=0 Turns it off 404 */ 405 #ifndef PNG_RELEASE_BUILD 406 # define PNG_RELEASE_BUILD (PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC) 407 #endif 408 409 /* SECURITY and SAFETY: 410 * 411 * libpng is built with support for internal limits on image dimensions and 412 * memory usage. These are documented in scripts/pnglibconf.dfa of the 413 * source and recorded in the machine generated header file pnglibconf.h. 414 */ 415 416 /* If you are running on a machine where you cannot allocate more 417 * than 64K of memory at once, uncomment this. While libpng will not 418 * normally need that much memory in a chunk (unless you load up a very 419 * large file), zlib needs to know how big of a chunk it can use, and 420 * libpng thus makes sure to check any memory allocation to verify it 421 * will fit into memory. 422 * 423 * zlib provides 'MAXSEG_64K' which, if defined, indicates the 424 * same limit and pngconf.h (already included) sets the limit 425 * if certain operating systems are detected. 426 */ 427 #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K) 428 # define PNG_MAX_MALLOC_64K 429 #endif 430 431 #ifndef PNG_UNUSED 432 /* Unused formal parameter warnings are silenced using the following macro 433 * which is expected to have no bad effects on performance (optimizing 434 * compilers will probably remove it entirely). Note that if you replace 435 * it with something other than whitespace, you must include the terminating 436 * semicolon. 437 */ 438 # define PNG_UNUSED(param) (void)param; 439 #endif 440 441 /* Just a little check that someone hasn't tried to define something 442 * contradictory. 443 */ 444 #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K) 445 # undef PNG_ZBUF_SIZE 446 # define PNG_ZBUF_SIZE 65536L 447 #endif 448 449 /* If warnings or errors are turned off the code is disabled or redirected here. 450 * From 1.5.4 functions have been added to allow very limited formatting of 451 * error and warning messages - this code will also be disabled here. 452 */ 453 #ifdef PNG_WARNINGS_SUPPORTED 454 # define PNG_WARNING_PARAMETERS(p) png_warning_parameters p; 455 #else 456 # define png_warning_parameter(p,number,string) ((void)0) 457 # define png_warning_parameter_unsigned(p,number,format,value) ((void)0) 458 # define png_warning_parameter_signed(p,number,format,value) ((void)0) 459 # define png_formatted_warning(pp,p,message) ((void)(pp)) 460 # define PNG_WARNING_PARAMETERS(p) 461 #endif 462 #ifndef PNG_ERROR_TEXT_SUPPORTED 463 # define png_fixed_error(s1,s2) png_err(s1) 464 #endif 465 466 /* Some fixed point APIs are still required even if not exported because 467 * they get used by the corresponding floating point APIs. This magic 468 * deals with this: 469 */ 470 #ifdef PNG_FIXED_POINT_SUPPORTED 471 # define PNGFAPI PNGAPI 472 #else 473 # define PNGFAPI /* PRIVATE */ 474 #endif 475 476 #ifndef PNG_VERSION_INFO_ONLY 477 /* Other defines specific to compilers can go here. Try to keep 478 * them inside an appropriate ifdef/endif pair for portability. 479 */ 480 481 /* C allows up-casts from (void*) to any pointer and (const void*) to any 482 * pointer to a const object. C++ regards this as a type error and requires an 483 * explicit, static, cast and provides the static_cast<> rune to ensure that 484 * const is not cast away. 485 */ 486 #ifdef __cplusplus 487 # define png_voidcast(type, value) static_cast<type>(value) 488 # define png_constcast(type, value) const_cast<type>(value) 489 # define png_aligncast(type, value) \ 490 static_cast<type>(static_cast<void*>(value)) 491 # define png_aligncastconst(type, value) \ 492 static_cast<type>(static_cast<const void*>(value)) 493 #else 494 # define png_voidcast(type, value) (value) 495 # ifdef _WIN64 496 # ifdef __GNUC__ 497 typedef unsigned long long png_ptruint; 498 # else 499 typedef unsigned __int64 png_ptruint; 500 # endif 501 # else 502 typedef unsigned long png_ptruint; 503 # endif 504 # define png_constcast(type, value) ((type)(png_ptruint)(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 # if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \ 521 defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC) 522 /* We need to check that <math.h> hasn't already been included earlier 523 * as it seems it doesn't agree with <fp.h>, yet we should really use 524 * <fp.h> if possible. 525 */ 526 # if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__) 527 # include <fp.h> 528 # endif 529 # else 530 # include <math.h> 531 # endif 532 # if defined(_AMIGA) && defined(__SASC) && defined(_M68881) 533 /* Amiga SAS/C: We must include builtin FPU functions when compiling using 534 * MATH=68881 535 */ 536 # include <m68881.h> 537 # endif 538 #endif 539 540 /* This provides the non-ANSI (far) memory allocation routines. */ 541 #if defined(__TURBOC__) && defined(__MSDOS__) 542 # include <mem.h> 543 # include <alloc.h> 544 #endif 545 546 #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \ 547 defined(_WIN32) || defined(__WIN32__) 548 # include <windows.h> /* defines _WINDOWS_ macro */ 549 #endif 550 #endif /* PNG_VERSION_INFO_ONLY */ 551 552 /* Moved here around 1.5.0beta36 from pngconf.h */ 553 /* Users may want to use these so they are not private. Any library 554 * functions that are passed far data must be model-independent. 555 */ 556 557 /* Memory model/platform independent fns */ 558 #ifndef PNG_ABORT 559 # ifdef _WINDOWS_ 560 # define PNG_ABORT() ExitProcess(0) 561 # else 562 # define PNG_ABORT() abort() 563 # endif 564 #endif 565 566 /* These macros may need to be architecture dependent. */ 567 #define PNG_ALIGN_NONE 0 /* do not use data alignment */ 568 #define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */ 569 #ifdef offsetof 570 # define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */ 571 #else 572 # define PNG_ALIGN_OFFSET -1 /* prevent the use of this */ 573 #endif 574 #define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */ 575 576 #ifndef PNG_ALIGN_TYPE 577 /* Default to using aligned access optimizations and requiring alignment to a 578 * multiple of the data type size. Override in a compiler specific fashion 579 * if necessary by inserting tests here: 580 */ 581 # define PNG_ALIGN_TYPE PNG_ALIGN_SIZE 582 #endif 583 584 #if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE 585 /* This is used because in some compiler implementations non-aligned 586 * structure members are supported, so the offsetof approach below fails. 587 * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access 588 * is good for performance. Do not do this unless you have tested the result 589 * and understand it. 590 */ 591 # define png_alignof(type) (sizeof (type)) 592 #else 593 # if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET 594 # define png_alignof(type) offsetof(struct{char c; type t;}, t) 595 # else 596 # if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS 597 # define png_alignof(type) (1) 598 # endif 599 /* Else leave png_alignof undefined to prevent use thereof */ 600 # endif 601 #endif 602 603 /* This implicitly assumes alignment is always to a power of 2. */ 604 #ifdef png_alignof 605 # define png_isaligned(ptr, type)\ 606 (((type)((const char*)ptr-(const char*)0) & \ 607 (type)(png_alignof(type)-1)) == 0) 608 #else 609 # define png_isaligned(ptr, type) 0 610 #endif 611 612 /* End of memory model/platform independent support */ 613 /* End of 1.5.0beta36 move from pngconf.h */ 614 615 /* CONSTANTS and UTILITY MACROS 616 * These are used internally by libpng and not exposed in the API 617 */ 618 619 /* Various modes of operation. Note that after an init, mode is set to 620 * zero automatically when the structure is created. Three of these 621 * are defined in png.h because they need to be visible to applications 622 * that call png_set_unknown_chunk(). 623 */ 624 /* #define PNG_HAVE_IHDR 0x01U (defined in png.h) */ 625 /* #define PNG_HAVE_PLTE 0x02U (defined in png.h) */ 626 #define PNG_HAVE_IDAT 0x04U 627 /* #define PNG_AFTER_IDAT 0x08U (defined in png.h) */ 628 #define PNG_HAVE_IEND 0x10U 629 /* 0x20U (unused) */ 630 /* 0x40U (unused) */ 631 /* 0x80U (unused) */ 632 #define PNG_HAVE_CHUNK_HEADER 0x100U 633 #define PNG_WROTE_tIME 0x200U 634 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400U 635 #define PNG_BACKGROUND_IS_GRAY 0x800U 636 #define PNG_HAVE_PNG_SIGNATURE 0x1000U 637 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000U /* Have another chunk after IDAT */ 638 /* 0x4000U (unused) */ 639 #define PNG_IS_READ_STRUCT 0x8000U /* Else is a write struct */ 640 641 /* Flags for the transformations the PNG library does on the image data */ 642 #define PNG_BGR 0x0001U 643 #define PNG_INTERLACE 0x0002U 644 #define PNG_PACK 0x0004U 645 #define PNG_SHIFT 0x0008U 646 #define PNG_SWAP_BYTES 0x0010U 647 #define PNG_INVERT_MONO 0x0020U 648 #define PNG_QUANTIZE 0x0040U 649 #define PNG_COMPOSE 0x0080U /* Was PNG_BACKGROUND */ 650 #define PNG_BACKGROUND_EXPAND 0x0100U 651 #define PNG_EXPAND_16 0x0200U /* Added to libpng 1.5.2 */ 652 #define PNG_16_TO_8 0x0400U /* Becomes 'chop' in 1.5.4 */ 653 #define PNG_RGBA 0x0800U 654 #define PNG_EXPAND 0x1000U 655 #define PNG_GAMMA 0x2000U 656 #define PNG_GRAY_TO_RGB 0x4000U 657 #define PNG_FILLER 0x8000U 658 #define PNG_PACKSWAP 0x10000U 659 #define PNG_SWAP_ALPHA 0x20000U 660 #define PNG_STRIP_ALPHA 0x40000U 661 #define PNG_INVERT_ALPHA 0x80000U 662 #define PNG_USER_TRANSFORM 0x100000U 663 #define PNG_RGB_TO_GRAY_ERR 0x200000U 664 #define PNG_RGB_TO_GRAY_WARN 0x400000U 665 #define PNG_RGB_TO_GRAY 0x600000U /* two bits, RGB_TO_GRAY_ERR|WARN */ 666 #define PNG_ENCODE_ALPHA 0x800000U /* Added to libpng-1.5.4 */ 667 #define PNG_ADD_ALPHA 0x1000000U /* Added to libpng-1.2.7 */ 668 #define PNG_EXPAND_tRNS 0x2000000U /* Added to libpng-1.2.9 */ 669 #define PNG_SCALE_16_TO_8 0x4000000U /* Added to libpng-1.5.4 */ 670 /* 0x8000000U unused */ 671 /* 0x10000000U unused */ 672 /* 0x20000000U unused */ 673 /* 0x40000000U unused */ 674 /* Flags for png_create_struct */ 675 #define PNG_STRUCT_PNG 0x0001U 676 #define PNG_STRUCT_INFO 0x0002U 677 678 /* Flags for the png_ptr->flags rather than declaring a byte for each one */ 679 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001U 680 #define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002U /* Added to libpng-1.6.0 */ 681 /* 0x0004U unused */ 682 #define PNG_FLAG_ZSTREAM_ENDED 0x0008U /* Added to libpng-1.6.0 */ 683 /* 0x0010U unused */ 684 /* 0x0020U unused */ 685 #define PNG_FLAG_ROW_INIT 0x0040U 686 #define PNG_FLAG_FILLER_AFTER 0x0080U 687 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100U 688 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200U 689 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400U 690 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800U 691 #define PNG_FLAG_ASSUME_sRGB 0x1000U /* Added to libpng-1.5.4 */ 692 #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000U /* Added to libpng-1.5.4 */ 693 #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000U /* Added to libpng-1.5.4 */ 694 /* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000U */ 695 /* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000U */ 696 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000U 697 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000U 698 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000U 699 #define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000U /* Added to libpng-1.4.0 */ 700 #define PNG_FLAG_APP_WARNINGS_WARN 0x200000U /* Added to libpng-1.6.0 */ 701 #define PNG_FLAG_APP_ERRORS_WARN 0x400000U /* Added to libpng-1.6.0 */ 702 /* 0x800000U unused */ 703 /* 0x1000000U unused */ 704 /* 0x2000000U unused */ 705 /* 0x4000000U unused */ 706 /* 0x8000000U unused */ 707 /* 0x10000000U unused */ 708 /* 0x20000000U unused */ 709 /* 0x40000000U unused */ 710 711 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 712 PNG_FLAG_CRC_ANCILLARY_NOWARN) 713 714 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 715 PNG_FLAG_CRC_CRITICAL_IGNORE) 716 717 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 718 PNG_FLAG_CRC_CRITICAL_MASK) 719 720 /* Save typing and make code easier to understand */ 721 722 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 723 abs((int)((c1).green) - (int)((c2).green)) + \ 724 abs((int)((c1).blue) - (int)((c2).blue))) 725 726 /* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255 727 * by dividing by 257 *with rounding*. This macro is exact for the given range. 728 * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the 729 * macro were established by experiment (modifying the added value). The macro 730 * has a second variant that takes a value already scaled by 255 and divides by 731 * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it 732 * only gives off-by-one errors and only for 0.5% (1 in 200) of the values. 733 */ 734 #define PNG_DIV65535(v24) (((v24) + 32895) >> 16) 735 #define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255) 736 737 /* Added to libpng-1.2.6 JB */ 738 #define PNG_ROWBYTES(pixel_bits, width) \ 739 ((pixel_bits) >= 8 ? \ 740 ((size_t)(width) * (((size_t)(pixel_bits)) >> 3)) : \ 741 (( ((size_t)(width) * ((size_t)(pixel_bits))) + 7) >> 3) ) 742 743 /* This returns the number of trailing bits in the last byte of a row, 0 if the 744 * last byte is completely full of pixels. It is, in principle, (pixel_bits x 745 * width) % 8, but that would overflow for large 'width'. The second macro is 746 * the same except that it returns the number of unused bits in the last byte; 747 * (8-TRAILBITS), but 0 when TRAILBITS is 0. 748 * 749 * NOTE: these macros are intended to be self-evidently correct and never 750 * overflow on the assumption that pixel_bits is in the range 0..255. The 751 * arguments are evaluated only once and they can be signed (e.g. as a result of 752 * the integral promotions). The result of the expression always has type 753 * (png_uint_32), however the compiler always knows it is in the range 0..7. 754 */ 755 #define PNG_TRAILBITS(pixel_bits, width) \ 756 (((pixel_bits) * ((width) % (png_uint_32)8)) % 8) 757 758 #define PNG_PADBITS(pixel_bits, width) \ 759 ((8 - PNG_TRAILBITS(pixel_bits, width)) % 8) 760 761 /* PNG_OUT_OF_RANGE returns true if value is outside the range 762 * ideal-delta..ideal+delta. Each argument is evaluated twice. 763 * "ideal" and "delta" should be constants, normally simple 764 * integers, "value" a variable. Added to libpng-1.2.6 JB 765 */ 766 #define PNG_OUT_OF_RANGE(value, ideal, delta) \ 767 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 768 769 /* Conversions between fixed and floating point, only defined if 770 * required (to make sure the code doesn't accidentally use float 771 * when it is supposedly disabled.) 772 */ 773 #ifdef PNG_FLOATING_POINT_SUPPORTED 774 /* The floating point conversion can't overflow, though it can and 775 * does lose accuracy relative to the original fixed point value. 776 * In practice this doesn't matter because png_fixed_point only 777 * stores numbers with very low precision. The png_ptr and s 778 * arguments are unused by default but are there in case error 779 * checking becomes a requirement. 780 */ 781 #define png_float(png_ptr, fixed, s) (.00001 * (fixed)) 782 783 /* The fixed point conversion performs range checking and evaluates 784 * its argument multiple times, so must be used with care. The 785 * range checking uses the PNG specification values for a signed 786 * 32-bit fixed point value except that the values are deliberately 787 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly 788 * (2^31-1) * 100000). 's' is a string that describes the value being 789 * converted. 790 * 791 * NOTE: this macro will raise a png_error if the range check fails, 792 * therefore it is normally only appropriate to use this on values 793 * that come from API calls or other sources where an out of range 794 * error indicates a programming error, not a data error! 795 * 796 * NOTE: by default this is off - the macro is not used - because the 797 * function call saves a lot of code. 798 */ 799 #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED 800 #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\ 801 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0)) 802 #endif 803 /* else the corresponding function is defined below, inside the scope of the 804 * cplusplus test. 805 */ 806 #endif 807 808 /* Constants for known chunk types. If you need to add a chunk, define the name 809 * here. For historical reasons these constants have the form png_<name>; i.e. 810 * the prefix is lower case. Please use decimal values as the parameters to 811 * match the ISO PNG specification and to avoid relying on the C locale 812 * interpretation of character values. 813 * 814 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values 815 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string 816 * to be generated if required. 817 * 818 * PNG_32b correctly produces a value shifted by up to 24 bits, even on 819 * architectures where (int) is only 16 bits. 820 */ 821 #define PNG_32b(b,s) ((png_uint_32)(b) << (s)) 822 #define PNG_U32(b1,b2,b3,b4) \ 823 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0)) 824 825 /* Constants for known chunk types. 826 * 827 * MAINTAINERS: If you need to add a chunk, define the name here. 828 * For historical reasons these constants have the form png_<name>; i.e. 829 * the prefix is lower case. Please use decimal values as the parameters to 830 * match the ISO PNG specification and to avoid relying on the C locale 831 * interpretation of character values. Please keep the list sorted. 832 * 833 * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk 834 * type. In fact the specification does not express chunk types this way, 835 * however using a 32-bit value means that the chunk type can be read from the 836 * stream using exactly the same code as used for a 32-bit unsigned value and 837 * can be examined far more efficiently (using one arithmetic compare). 838 * 839 * Prior to 1.5.6 the chunk type constants were expressed as C strings. The 840 * libpng API still uses strings for 'unknown' chunks and a macro, 841 * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice 842 * that for portable code numeric values must still be used; the string "IHDR" 843 * is not portable and neither is PNG_U32('I', 'H', 'D', 'R'). 844 * 845 * In 1.7.0 the definitions will be made public in png.h to avoid having to 846 * duplicate the same definitions in application code. 847 */ 848 #define png_IDAT PNG_U32( 73, 68, 65, 84) 849 #define png_IEND PNG_U32( 73, 69, 78, 68) 850 #define png_IHDR PNG_U32( 73, 72, 68, 82) 851 #define png_PLTE PNG_U32( 80, 76, 84, 69) 852 #define png_bKGD PNG_U32( 98, 75, 71, 68) 853 #define png_cHRM PNG_U32( 99, 72, 82, 77) 854 #define png_eXIf PNG_U32(101, 88, 73, 102) /* registered July 2017 */ 855 #define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */ 856 #define png_gAMA PNG_U32(103, 65, 77, 65) 857 #define png_gIFg PNG_U32(103, 73, 70, 103) 858 #define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */ 859 #define png_gIFx PNG_U32(103, 73, 70, 120) 860 #define png_hIST PNG_U32(104, 73, 83, 84) 861 #define png_iCCP PNG_U32(105, 67, 67, 80) 862 #define png_iTXt PNG_U32(105, 84, 88, 116) 863 #define png_oFFs PNG_U32(111, 70, 70, 115) 864 #define png_pCAL PNG_U32(112, 67, 65, 76) 865 #define png_pHYs PNG_U32(112, 72, 89, 115) 866 #define png_sBIT PNG_U32(115, 66, 73, 84) 867 #define png_sCAL PNG_U32(115, 67, 65, 76) 868 #define png_sPLT PNG_U32(115, 80, 76, 84) 869 #define png_sRGB PNG_U32(115, 82, 71, 66) 870 #define png_sTER PNG_U32(115, 84, 69, 82) 871 #define png_tEXt PNG_U32(116, 69, 88, 116) 872 #define png_tIME PNG_U32(116, 73, 77, 69) 873 #define png_tRNS PNG_U32(116, 82, 78, 83) 874 #define png_zTXt PNG_U32(122, 84, 88, 116) 875 876 /* The following will work on (signed char*) strings, whereas the get_uint_32 877 * macro will fail on top-bit-set values because of the sign extension. 878 */ 879 #define PNG_CHUNK_FROM_STRING(s)\ 880 PNG_U32(0xff & (s)[0], 0xff & (s)[1], 0xff & (s)[2], 0xff & (s)[3]) 881 882 /* This uses (char), not (png_byte) to avoid warnings on systems where (char) is 883 * signed and the argument is a (char[]) This macro will fail miserably on 884 * systems where (char) is more than 8 bits. 885 */ 886 #define PNG_STRING_FROM_CHUNK(s,c)\ 887 (void)(((char*)(s))[0]=(char)(((c)>>24) & 0xff), \ 888 ((char*)(s))[1]=(char)(((c)>>16) & 0xff),\ 889 ((char*)(s))[2]=(char)(((c)>>8) & 0xff), \ 890 ((char*)(s))[3]=(char)((c & 0xff))) 891 892 /* Do the same but terminate with a null character. */ 893 #define PNG_CSTRING_FROM_CHUNK(s,c)\ 894 (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0) 895 896 /* Test on flag values as defined in the spec (section 5.4): */ 897 #define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29)) 898 #define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c)) 899 #define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21)) 900 #define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13)) 901 #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5)) 902 903 /* Gamma values (new at libpng-1.5.4): */ 904 #define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */ 905 #define PNG_GAMMA_MAC_INVERSE 65909 906 #define PNG_GAMMA_sRGB_INVERSE 45455 907 908 /* Almost everything below is C specific; the #defines above can be used in 909 * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot. 910 */ 911 #ifndef PNG_VERSION_INFO_ONLY 912 913 #include "pngstruct.h" 914 #include "pnginfo.h" 915 916 /* Validate the include paths - the include path used to generate pnglibconf.h 917 * must match that used in the build, or we must be using pnglibconf.h.prebuilt: 918 */ 919 #if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM 920 # error ZLIB_VERNUM != PNG_ZLIB_VERNUM \ 921 "-I (include path) error: see the notes in pngpriv.h" 922 /* This means that when pnglibconf.h was built the copy of zlib.h that it 923 * used is not the same as the one being used here. Because the build of 924 * libpng makes decisions to use inflateInit2 and inflateReset2 based on the 925 * zlib version number and because this affects handling of certain broken 926 * PNG files the -I directives must match. 927 * 928 * The most likely explanation is that you passed a -I in CFLAGS. This will 929 * not work; all the preprocessor directives and in particular all the -I 930 * directives must be in CPPFLAGS. 931 */ 932 #endif 933 934 /* This is used for 16-bit gamma tables -- only the top level pointers are 935 * const; this could be changed: 936 */ 937 typedef const png_uint_16p * png_const_uint_16pp; 938 939 /* Added to libpng-1.5.7: sRGB conversion tables */ 940 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 941 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 942 #ifdef PNG_SIMPLIFIED_READ_SUPPORTED 943 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]); 944 /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value, 945 * 0..65535. This table gives the closest 16-bit answers (no errors). 946 */ 947 #endif 948 949 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]); 950 PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]); 951 952 #define PNG_sRGB_FROM_LINEAR(linear) \ 953 ((png_byte)(0xff & ((png_sRGB_base[(linear)>>15] \ 954 + ((((linear) & 0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8))) 955 /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB 956 * encoded value with maximum error 0.646365. Note that the input is not a 957 * 16-bit value; it has been multiplied by 255! */ 958 #endif /* SIMPLIFIED_READ/WRITE */ 959 960 961 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 962 #ifdef __cplusplus 963 extern "C" { 964 #endif /* __cplusplus */ 965 966 /* Internal functions; these are not exported from a DLL however because they 967 * are used within several of the C source files they have to be C extern. 968 * 969 * All of these functions must be declared with PNG_INTERNAL_FUNCTION. 970 */ 971 972 /* Zlib support */ 973 #define PNG_UNEXPECTED_ZLIB_RETURN (-7) 974 PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret), 975 PNG_EMPTY); 976 /* Used by the zlib handling functions to ensure that z_stream::msg is always 977 * set before they return. 978 */ 979 980 #ifdef PNG_WRITE_SUPPORTED 981 PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr, 982 png_compression_bufferp *list),PNG_EMPTY); 983 /* Free the buffer list used by the compressed write code. */ 984 #endif 985 986 #if defined(PNG_FLOATING_POINT_SUPPORTED) && \ 987 !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \ 988 (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \ 989 defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \ 990 defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \ 991 (defined(PNG_sCAL_SUPPORTED) && \ 992 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)) 993 PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr, 994 double fp, png_const_charp text),PNG_EMPTY); 995 #endif 996 997 /* Check the user version string for compatibility, returns false if the version 998 * numbers aren't compatible. 999 */ 1000 PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr, 1001 png_const_charp user_png_ver),PNG_EMPTY); 1002 1003 /* Internal base allocator - no messages, NULL on failure to allocate. This 1004 * does, however, call the application provided allocator and that could call 1005 * png_error (although that would be a bug in the application implementation.) 1006 */ 1007 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr, 1008 png_alloc_size_t size),PNG_ALLOCATED); 1009 1010 #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\ 1011 defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED) 1012 /* Internal array allocator, outputs no error or warning messages on failure, 1013 * just returns NULL. 1014 */ 1015 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr, 1016 int nelements, size_t element_size),PNG_ALLOCATED); 1017 1018 /* The same but an existing array is extended by add_elements. This function 1019 * also memsets the new elements to 0 and copies the old elements. The old 1020 * array is not freed or altered. 1021 */ 1022 PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr, 1023 png_const_voidp array, int old_elements, int add_elements, 1024 size_t element_size),PNG_ALLOCATED); 1025 #endif /* text, sPLT or unknown chunks */ 1026 1027 /* Magic to create a struct when there is no struct to call the user supplied 1028 * memory allocators. Because error handling has not been set up the memory 1029 * handlers can't safely call png_error, but this is an obscure and undocumented 1030 * restriction so libpng has to assume that the 'free' handler, at least, might 1031 * call png_error. 1032 */ 1033 PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct, 1034 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, 1035 png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, 1036 png_free_ptr free_fn),PNG_ALLOCATED); 1037 1038 /* Free memory from internal libpng struct */ 1039 PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr), 1040 PNG_EMPTY); 1041 1042 /* Free an allocated jmp_buf (always succeeds) */ 1043 PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY); 1044 1045 /* Function to allocate memory for zlib. PNGAPI is disallowed. */ 1046 PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size), 1047 PNG_ALLOCATED); 1048 1049 /* Function to free memory for zlib. PNGAPI is disallowed. */ 1050 PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY); 1051 1052 /* Next four functions are used internally as callbacks. PNGCBAPI is required 1053 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to 1054 * PNGCBAPI at 1.5.0 1055 */ 1056 1057 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr, 1058 png_bytep data, size_t length),PNG_EMPTY); 1059 1060 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1061 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr, 1062 png_bytep buffer, size_t length),PNG_EMPTY); 1063 #endif 1064 1065 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr, 1066 png_bytep data, size_t length),PNG_EMPTY); 1067 1068 #ifdef PNG_WRITE_FLUSH_SUPPORTED 1069 # ifdef PNG_STDIO_SUPPORTED 1070 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr), 1071 PNG_EMPTY); 1072 # endif 1073 #endif 1074 1075 /* Reset the CRC variable */ 1076 PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY); 1077 1078 /* Write the "data" buffer to whatever output you are using */ 1079 PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr, 1080 png_const_bytep data, size_t length),PNG_EMPTY); 1081 1082 /* Read and check the PNG file signature */ 1083 PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr, 1084 png_inforp info_ptr),PNG_EMPTY); 1085 1086 /* Read the chunk header (length + type name) */ 1087 PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr), 1088 PNG_EMPTY); 1089 1090 /* Read data from whatever input you are using into the "data" buffer */ 1091 PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data, 1092 size_t length),PNG_EMPTY); 1093 1094 /* Read bytes into buf, and update png_ptr->crc */ 1095 PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf, 1096 png_uint_32 length),PNG_EMPTY); 1097 1098 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 1099 PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr, 1100 png_uint_32 skip),PNG_EMPTY); 1101 1102 /* Read the CRC from the file and compare it to the libpng calculated CRC */ 1103 PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY); 1104 1105 /* Calculate the CRC over a section of data. Note that we are only 1106 * passing a maximum of 64K on systems that have this as a memory limit, 1107 * since this is the maximum buffer size we can specify. 1108 */ 1109 PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr, 1110 png_const_bytep ptr, size_t length),PNG_EMPTY); 1111 1112 #ifdef PNG_WRITE_FLUSH_SUPPORTED 1113 PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY); 1114 #endif 1115 1116 /* Write various chunks */ 1117 1118 /* Write the IHDR chunk, and update the png_struct with the necessary 1119 * information. 1120 */ 1121 PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr, 1122 png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, 1123 int compression_method, int filter_method, int interlace_method),PNG_EMPTY); 1124 1125 PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr, 1126 png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY); 1127 1128 PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr, 1129 png_const_bytep row_data, png_alloc_size_t row_data_length, int flush), 1130 PNG_EMPTY); 1131 1132 PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY); 1133 1134 #ifdef PNG_WRITE_gAMA_SUPPORTED 1135 PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr, 1136 png_fixed_point file_gamma),PNG_EMPTY); 1137 #endif 1138 1139 #ifdef PNG_WRITE_sBIT_SUPPORTED 1140 PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr, 1141 png_const_color_8p sbit, int color_type),PNG_EMPTY); 1142 #endif 1143 1144 #ifdef PNG_WRITE_cHRM_SUPPORTED 1145 PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr, 1146 const png_xy *xy), PNG_EMPTY); 1147 /* The xy value must have been previously validated */ 1148 #endif 1149 1150 #ifdef PNG_WRITE_sRGB_SUPPORTED 1151 PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr, 1152 int intent),PNG_EMPTY); 1153 #endif 1154 1155 #ifdef PNG_WRITE_eXIf_SUPPORTED 1156 PNG_INTERNAL_FUNCTION(void,png_write_eXIf,(png_structrp png_ptr, 1157 png_bytep exif, int num_exif),PNG_EMPTY); 1158 #endif 1159 1160 #ifdef PNG_WRITE_iCCP_SUPPORTED 1161 PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr, 1162 png_const_charp name, png_const_bytep profile), PNG_EMPTY); 1163 /* The profile must have been previously validated for correctness, the 1164 * length comes from the first four bytes. Only the base, deflate, 1165 * compression is supported. 1166 */ 1167 #endif 1168 1169 #ifdef PNG_WRITE_sPLT_SUPPORTED 1170 PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr, 1171 png_const_sPLT_tp palette),PNG_EMPTY); 1172 #endif 1173 1174 #ifdef PNG_WRITE_tRNS_SUPPORTED 1175 PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr, 1176 png_const_bytep trans, png_const_color_16p values, int number, 1177 int color_type),PNG_EMPTY); 1178 #endif 1179 1180 #ifdef PNG_WRITE_bKGD_SUPPORTED 1181 PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr, 1182 png_const_color_16p values, int color_type),PNG_EMPTY); 1183 #endif 1184 1185 #ifdef PNG_WRITE_hIST_SUPPORTED 1186 PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr, 1187 png_const_uint_16p hist, int num_hist),PNG_EMPTY); 1188 #endif 1189 1190 /* Chunks that have keywords */ 1191 #ifdef PNG_WRITE_tEXt_SUPPORTED 1192 PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr, 1193 png_const_charp key, png_const_charp text, size_t text_len),PNG_EMPTY); 1194 #endif 1195 1196 #ifdef PNG_WRITE_zTXt_SUPPORTED 1197 PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp 1198 key, png_const_charp text, int compression),PNG_EMPTY); 1199 #endif 1200 1201 #ifdef PNG_WRITE_iTXt_SUPPORTED 1202 PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr, 1203 int compression, png_const_charp key, png_const_charp lang, 1204 png_const_charp lang_key, png_const_charp text),PNG_EMPTY); 1205 #endif 1206 1207 #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ 1208 PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr, 1209 png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY); 1210 #endif 1211 1212 #ifdef PNG_WRITE_oFFs_SUPPORTED 1213 PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr, 1214 png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY); 1215 #endif 1216 1217 #ifdef PNG_WRITE_pCAL_SUPPORTED 1218 PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr, 1219 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, 1220 png_const_charp units, png_charpp params),PNG_EMPTY); 1221 #endif 1222 1223 #ifdef PNG_WRITE_pHYs_SUPPORTED 1224 PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr, 1225 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 1226 int unit_type),PNG_EMPTY); 1227 #endif 1228 1229 #ifdef PNG_WRITE_tIME_SUPPORTED 1230 PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr, 1231 png_const_timep mod_time),PNG_EMPTY); 1232 #endif 1233 1234 #ifdef PNG_WRITE_sCAL_SUPPORTED 1235 PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr, 1236 int unit, png_const_charp width, png_const_charp height),PNG_EMPTY); 1237 #endif 1238 1239 /* Called when finished processing a row of data */ 1240 PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr), 1241 PNG_EMPTY); 1242 1243 /* Internal use only. Called before first row of data */ 1244 PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr), 1245 PNG_EMPTY); 1246 1247 /* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an 1248 * array of png_ptr->width pixels. If the image is not interlaced or this 1249 * is the final pass this just does a memcpy, otherwise the "display" flag 1250 * is used to determine whether to copy pixels that are not in the current pass. 1251 * 1252 * Because 'png_do_read_interlace' (below) replicates pixels this allows this 1253 * function to achieve the documented 'blocky' appearance during interlaced read 1254 * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row' 1255 * are not changed if they are not in the current pass, when display is 0. 1256 * 1257 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless. 1258 * 1259 * The API always reads from the png_struct row buffer and always assumes that 1260 * it is full width (png_do_read_interlace has already been called.) 1261 * 1262 * This function is only ever used to write to row buffers provided by the 1263 * caller of the relevant libpng API and the row must have already been 1264 * transformed by the read transformations. 1265 * 1266 * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed 1267 * bitmasks for use within the code, otherwise runtime generated masks are used. 1268 * The default is compile time masks. 1269 */ 1270 #ifndef PNG_USE_COMPILE_TIME_MASKS 1271 # define PNG_USE_COMPILE_TIME_MASKS 1 1272 #endif 1273 PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr, 1274 png_bytep row, int display),PNG_EMPTY); 1275 1276 #ifdef PNG_READ_INTERLACING_SUPPORTED 1277 /* Expand an interlaced row: the 'row_info' describes the pass data that has 1278 * been read in and must correspond to the pixels in 'row', the pixels are 1279 * expanded (moved apart) in 'row' to match the final layout, when doing this 1280 * the pixels are *replicated* to the intervening space. This is essential for 1281 * the correct operation of png_combine_row, above. 1282 */ 1283 PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info, 1284 png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY); 1285 #endif 1286 1287 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 1288 1289 #ifdef PNG_WRITE_INTERLACING_SUPPORTED 1290 /* Grab pixels out of a row for an interlaced pass */ 1291 PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info, 1292 png_bytep row, int pass),PNG_EMPTY); 1293 #endif 1294 1295 /* Unfilter a row: check the filter value before calling this, there is no point 1296 * calling it for PNG_FILTER_VALUE_NONE. 1297 */ 1298 PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop 1299 row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY); 1300 1301 #if PNG_ARM_NEON_OPT > 0 1302 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info, 1303 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1304 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop 1305 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1306 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop 1307 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1308 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop 1309 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1310 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop 1311 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1312 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop 1313 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1314 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop 1315 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1316 #endif 1317 1318 #if PNG_MIPS_MSA_OPT > 0 1319 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_msa,(png_row_infop row_info, 1320 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1321 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_msa,(png_row_infop 1322 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1323 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_msa,(png_row_infop 1324 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1325 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_msa,(png_row_infop 1326 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1327 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_msa,(png_row_infop 1328 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1329 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_msa,(png_row_infop 1330 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1331 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_msa,(png_row_infop 1332 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1333 #endif 1334 1335 #if PNG_POWERPC_VSX_OPT > 0 1336 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_vsx,(png_row_infop row_info, 1337 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1338 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_vsx,(png_row_infop 1339 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1340 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_vsx,(png_row_infop 1341 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1342 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_vsx,(png_row_infop 1343 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1344 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_vsx,(png_row_infop 1345 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1346 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_vsx,(png_row_infop 1347 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1348 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_vsx,(png_row_infop 1349 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1350 #endif 1351 1352 #if PNG_INTEL_SSE_IMPLEMENTATION > 0 1353 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_sse2,(png_row_infop 1354 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1355 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_sse2,(png_row_infop 1356 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1357 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_sse2,(png_row_infop 1358 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1359 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_sse2,(png_row_infop 1360 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1361 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_sse2,(png_row_infop 1362 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1363 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_sse2,(png_row_infop 1364 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1365 #endif 1366 1367 /* Choose the best filter to use and filter the row data */ 1368 PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr, 1369 png_row_infop row_info),PNG_EMPTY); 1370 1371 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED 1372 PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr, 1373 png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY); 1374 /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer 1375 * is NULL the function checks, instead, for the end of the stream. In this 1376 * case a benign error will be issued if the stream end is not found or if 1377 * extra data has to be consumed. 1378 */ 1379 PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr), 1380 PNG_EMPTY); 1381 /* This cleans up when the IDAT LZ stream does not end when the last image 1382 * byte is read; there is still some pending input. 1383 */ 1384 1385 PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr), 1386 PNG_EMPTY); 1387 /* Finish a row while reading, dealing with interlacing passes, etc. */ 1388 #endif /* SEQUENTIAL_READ */ 1389 1390 /* Initialize the row buffers, etc. */ 1391 PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY); 1392 1393 #if ZLIB_VERNUM >= 0x1240 1394 PNG_INTERNAL_FUNCTION(int,png_zlib_inflate,(png_structrp png_ptr, int flush), 1395 PNG_EMPTY); 1396 # define PNG_INFLATE(pp, flush) png_zlib_inflate(pp, flush) 1397 #else /* Zlib < 1.2.4 */ 1398 # define PNG_INFLATE(pp, flush) inflate(&(pp)->zstream, flush) 1399 #endif /* Zlib < 1.2.4 */ 1400 1401 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1402 /* Optional call to update the users info structure */ 1403 PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr, 1404 png_inforp info_ptr),PNG_EMPTY); 1405 #endif 1406 1407 /* Shared transform functions, defined in pngtran.c */ 1408 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 1409 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 1410 PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info, 1411 png_bytep row, int at_start),PNG_EMPTY); 1412 #endif 1413 1414 #ifdef PNG_16BIT_SUPPORTED 1415 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 1416 PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info, 1417 png_bytep row),PNG_EMPTY); 1418 #endif 1419 #endif 1420 1421 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ 1422 defined(PNG_WRITE_PACKSWAP_SUPPORTED) 1423 PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info, 1424 png_bytep row),PNG_EMPTY); 1425 #endif 1426 1427 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 1428 PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info, 1429 png_bytep row),PNG_EMPTY); 1430 #endif 1431 1432 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1433 PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info, 1434 png_bytep row),PNG_EMPTY); 1435 #endif 1436 1437 /* The following decodes the appropriate chunks, and does error correction, 1438 * then calls the appropriate callback for the chunk if it is valid. 1439 */ 1440 1441 /* Decode the IHDR chunk */ 1442 PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr, 1443 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1444 PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr, 1445 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1446 PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr, 1447 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1448 1449 #ifdef PNG_READ_bKGD_SUPPORTED 1450 PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr, 1451 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1452 #endif 1453 1454 #ifdef PNG_READ_cHRM_SUPPORTED 1455 PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr, 1456 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1457 #endif 1458 1459 #ifdef PNG_READ_eXIf_SUPPORTED 1460 PNG_INTERNAL_FUNCTION(void,png_handle_eXIf,(png_structrp png_ptr, 1461 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1462 #endif 1463 1464 #ifdef PNG_READ_gAMA_SUPPORTED 1465 PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr, 1466 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1467 #endif 1468 1469 #ifdef PNG_READ_hIST_SUPPORTED 1470 PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr, 1471 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1472 #endif 1473 1474 #ifdef PNG_READ_iCCP_SUPPORTED 1475 PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr, 1476 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1477 #endif /* READ_iCCP */ 1478 1479 #ifdef PNG_READ_iTXt_SUPPORTED 1480 PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr, 1481 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1482 #endif 1483 1484 #ifdef PNG_READ_oFFs_SUPPORTED 1485 PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr, 1486 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1487 #endif 1488 1489 #ifdef PNG_READ_pCAL_SUPPORTED 1490 PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr, 1491 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1492 #endif 1493 1494 #ifdef PNG_READ_pHYs_SUPPORTED 1495 PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr, 1496 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1497 #endif 1498 1499 #ifdef PNG_READ_sBIT_SUPPORTED 1500 PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr, 1501 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1502 #endif 1503 1504 #ifdef PNG_READ_sCAL_SUPPORTED 1505 PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr, 1506 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1507 #endif 1508 1509 #ifdef PNG_READ_sPLT_SUPPORTED 1510 PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr, 1511 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1512 #endif /* READ_sPLT */ 1513 1514 #ifdef PNG_READ_sRGB_SUPPORTED 1515 PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr, 1516 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1517 #endif 1518 1519 #ifdef PNG_READ_tEXt_SUPPORTED 1520 PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr, 1521 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1522 #endif 1523 1524 #ifdef PNG_READ_tIME_SUPPORTED 1525 PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr, 1526 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1527 #endif 1528 1529 #ifdef PNG_READ_tRNS_SUPPORTED 1530 PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr, 1531 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1532 #endif 1533 1534 #ifdef PNG_READ_zTXt_SUPPORTED 1535 PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr, 1536 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1537 #endif 1538 1539 PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_const_structrp png_ptr, 1540 png_uint_32 chunk_name),PNG_EMPTY); 1541 1542 PNG_INTERNAL_FUNCTION(void,png_check_chunk_length,(png_const_structrp png_ptr, 1543 png_uint_32 chunk_length),PNG_EMPTY); 1544 1545 PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr, 1546 png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY); 1547 /* This is the function that gets called for unknown chunks. The 'keep' 1548 * argument is either non-zero for a known chunk that has been set to be 1549 * handled as unknown or zero for an unknown chunk. By default the function 1550 * just skips the chunk or errors out if it is critical. 1551 */ 1552 1553 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\ 1554 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 1555 PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling, 1556 (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY); 1557 /* Exactly as the API png_handle_as_unknown() except that the argument is a 1558 * 32-bit chunk name, not a string. 1559 */ 1560 #endif /* READ_UNKNOWN_CHUNKS || HANDLE_AS_UNKNOWN */ 1561 1562 /* Handle the transformations for reading and writing */ 1563 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1564 PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr, 1565 png_row_infop row_info),PNG_EMPTY); 1566 #endif 1567 #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED 1568 PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr, 1569 png_row_infop row_info),PNG_EMPTY); 1570 #endif 1571 1572 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1573 PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr), 1574 PNG_EMPTY); 1575 #endif 1576 1577 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1578 PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr, 1579 png_inforp info_ptr),PNG_EMPTY); 1580 PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr, 1581 png_inforp info_ptr),PNG_EMPTY); 1582 PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY); 1583 PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr), 1584 PNG_EMPTY); 1585 PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr, 1586 png_bytep buffer, size_t buffer_length),PNG_EMPTY); 1587 PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY); 1588 PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr, 1589 png_bytep buffer, size_t buffer_length),PNG_EMPTY); 1590 PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr), 1591 PNG_EMPTY); 1592 PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr, 1593 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1594 PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr, 1595 png_inforp info_ptr),PNG_EMPTY); 1596 PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr, 1597 png_inforp info_ptr),PNG_EMPTY); 1598 PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr, 1599 png_bytep row),PNG_EMPTY); 1600 PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr, 1601 png_inforp info_ptr),PNG_EMPTY); 1602 PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr, 1603 png_inforp info_ptr),PNG_EMPTY); 1604 PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr), 1605 PNG_EMPTY); 1606 # ifdef PNG_READ_tEXt_SUPPORTED 1607 PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr, 1608 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1609 PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr, 1610 png_inforp info_ptr),PNG_EMPTY); 1611 # endif 1612 # ifdef PNG_READ_zTXt_SUPPORTED 1613 PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr, 1614 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1615 PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr, 1616 png_inforp info_ptr),PNG_EMPTY); 1617 # endif 1618 # ifdef PNG_READ_iTXt_SUPPORTED 1619 PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr, 1620 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1621 PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr, 1622 png_inforp info_ptr),PNG_EMPTY); 1623 # endif 1624 1625 #endif /* PROGRESSIVE_READ */ 1626 1627 /* Added at libpng version 1.6.0 */ 1628 #ifdef PNG_GAMMA_SUPPORTED 1629 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr, 1630 png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY); 1631 /* Set the colorspace gamma with a value provided by the application or by 1632 * the gAMA chunk on read. The value will override anything set by an ICC 1633 * profile. 1634 */ 1635 1636 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr, 1637 png_inforp info_ptr), PNG_EMPTY); 1638 /* Synchronize the info 'valid' flags with the colorspace */ 1639 1640 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr, 1641 png_inforp info_ptr), PNG_EMPTY); 1642 /* Copy the png_struct colorspace to the info_struct and call the above to 1643 * synchronize the flags. Checks for NULL info_ptr and does nothing. 1644 */ 1645 #endif 1646 1647 /* Added at libpng version 1.4.0 */ 1648 #ifdef PNG_COLORSPACE_SUPPORTED 1649 /* These internal functions are for maintaining the colorspace structure within 1650 * a png_info or png_struct (or, indeed, both). 1651 */ 1652 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities, 1653 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy, 1654 int preferred), PNG_EMPTY); 1655 1656 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints, 1657 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ, 1658 int preferred), PNG_EMPTY); 1659 1660 #ifdef PNG_sRGB_SUPPORTED 1661 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr, 1662 png_colorspacerp colorspace, int intent), PNG_EMPTY); 1663 /* This does set the colorspace gAMA and cHRM values too, but doesn't set the 1664 * flags to write them, if it returns false there was a problem and an error 1665 * message has already been output (but the colorspace may still need to be 1666 * synced to record the invalid flag). 1667 */ 1668 #endif /* sRGB */ 1669 1670 #ifdef PNG_iCCP_SUPPORTED 1671 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr, 1672 png_colorspacerp colorspace, png_const_charp name, 1673 png_uint_32 profile_length, png_const_bytep profile, int color_type), 1674 PNG_EMPTY); 1675 /* The 'name' is used for information only */ 1676 1677 /* Routines for checking parts of an ICC profile. */ 1678 #ifdef PNG_READ_iCCP_SUPPORTED 1679 PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr, 1680 png_colorspacerp colorspace, png_const_charp name, 1681 png_uint_32 profile_length), PNG_EMPTY); 1682 #endif /* READ_iCCP */ 1683 PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr, 1684 png_colorspacerp colorspace, png_const_charp name, 1685 png_uint_32 profile_length, 1686 png_const_bytep profile /* first 132 bytes only */, int color_type), 1687 PNG_EMPTY); 1688 PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr, 1689 png_colorspacerp colorspace, png_const_charp name, 1690 png_uint_32 profile_length, 1691 png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY); 1692 #ifdef PNG_sRGB_SUPPORTED 1693 PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,( 1694 png_const_structrp png_ptr, png_colorspacerp colorspace, 1695 png_const_bytep profile, uLong adler), PNG_EMPTY); 1696 /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may 1697 * be zero to indicate that it is not available. It is used, if provided, 1698 * as a fast check on the profile when checking to see if it is sRGB. 1699 */ 1700 #endif 1701 #endif /* iCCP */ 1702 1703 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1704 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients, 1705 (png_structrp png_ptr), PNG_EMPTY); 1706 /* Set the rgb_to_gray coefficients from the colorspace Y values */ 1707 #endif /* READ_RGB_TO_GRAY */ 1708 #endif /* COLORSPACE */ 1709 1710 /* Added at libpng version 1.4.0 */ 1711 PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr, 1712 png_uint_32 width, png_uint_32 height, int bit_depth, 1713 int color_type, int interlace_type, int compression_type, 1714 int filter_type),PNG_EMPTY); 1715 1716 /* Added at libpng version 1.5.10 */ 1717 #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \ 1718 defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED) 1719 PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes, 1720 (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY); 1721 #endif 1722 1723 #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) 1724 PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr, 1725 png_const_charp name),PNG_NORETURN); 1726 #endif 1727 1728 /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite 1729 * the end. Always leaves the buffer nul terminated. Never errors out (and 1730 * there is no error code.) 1731 */ 1732 PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize, 1733 size_t pos, png_const_charp string),PNG_EMPTY); 1734 1735 /* Various internal functions to handle formatted warning messages, currently 1736 * only implemented for warnings. 1737 */ 1738 #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) 1739 /* Utility to dump an unsigned value into a buffer, given a start pointer and 1740 * and end pointer (which should point just *beyond* the end of the buffer!) 1741 * Returns the pointer to the start of the formatted string. This utility only 1742 * does unsigned values. 1743 */ 1744 PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start, 1745 png_charp end, int format, png_alloc_size_t number),PNG_EMPTY); 1746 1747 /* Convenience macro that takes an array: */ 1748 #define PNG_FORMAT_NUMBER(buffer,format,number) \ 1749 png_format_number(buffer, buffer + (sizeof buffer), format, number) 1750 1751 /* Suggested size for a number buffer (enough for 64 bits and a sign!) */ 1752 #define PNG_NUMBER_BUFFER_SIZE 24 1753 1754 /* These are the integer formats currently supported, the name is formed from 1755 * the standard printf(3) format string. 1756 */ 1757 #define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */ 1758 #define PNG_NUMBER_FORMAT_02u 2 1759 #define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */ 1760 #define PNG_NUMBER_FORMAT_02d 2 1761 #define PNG_NUMBER_FORMAT_x 3 1762 #define PNG_NUMBER_FORMAT_02x 4 1763 #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */ 1764 #endif 1765 1766 #ifdef PNG_WARNINGS_SUPPORTED 1767 /* New defines and members adding in libpng-1.5.4 */ 1768 # define PNG_WARNING_PARAMETER_SIZE 32 1769 # define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */ 1770 1771 /* An l-value of this type has to be passed to the APIs below to cache the 1772 * values of the parameters to a formatted warning message. 1773 */ 1774 typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][ 1775 PNG_WARNING_PARAMETER_SIZE]; 1776 1777 PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p, 1778 int number, png_const_charp string),PNG_EMPTY); 1779 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters, 1780 * including the trailing '\0'. 1781 */ 1782 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned, 1783 (png_warning_parameters p, int number, int format, png_alloc_size_t value), 1784 PNG_EMPTY); 1785 /* Use png_alloc_size_t because it is an unsigned type as big as any we 1786 * need to output. Use the following for a signed value. 1787 */ 1788 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed, 1789 (png_warning_parameters p, int number, int format, png_int_32 value), 1790 PNG_EMPTY); 1791 1792 PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr, 1793 png_warning_parameters p, png_const_charp message),PNG_EMPTY); 1794 /* 'message' follows the X/Open approach of using @1, @2 to insert 1795 * parameters previously supplied using the above functions. Errors in 1796 * specifying the parameters will simply result in garbage substitutions. 1797 */ 1798 #endif 1799 1800 #ifdef PNG_BENIGN_ERRORS_SUPPORTED 1801 /* Application errors (new in 1.6); use these functions (declared below) for 1802 * errors in the parameters or order of API function calls on read. The 1803 * 'warning' should be used for an error that can be handled completely; the 1804 * 'error' for one which can be handled safely but which may lose application 1805 * information or settings. 1806 * 1807 * By default these both result in a png_error call prior to release, while in a 1808 * released version the 'warning' is just a warning. However if the application 1809 * explicitly disables benign errors (explicitly permitting the code to lose 1810 * information) they both turn into warnings. 1811 * 1812 * If benign errors aren't supported they end up as the corresponding base call 1813 * (png_warning or png_error.) 1814 */ 1815 PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr, 1816 png_const_charp message),PNG_EMPTY); 1817 /* The application provided invalid parameters to an API function or called 1818 * an API function at the wrong time, libpng can completely recover. 1819 */ 1820 1821 PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr, 1822 png_const_charp message),PNG_EMPTY); 1823 /* As above but libpng will ignore the call, or attempt some other partial 1824 * recovery from the error. 1825 */ 1826 #else 1827 # define png_app_warning(pp,s) png_warning(pp,s) 1828 # define png_app_error(pp,s) png_error(pp,s) 1829 #endif 1830 1831 PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr, 1832 png_const_charp message, int error),PNG_EMPTY); 1833 /* Report a recoverable issue in chunk data. On read this is used to report 1834 * a problem found while reading a particular chunk and the 1835 * png_chunk_benign_error or png_chunk_warning function is used as 1836 * appropriate. On write this is used to report an error that comes from 1837 * data set via an application call to a png_set_ API and png_app_error or 1838 * png_app_warning is used as appropriate. 1839 * 1840 * The 'error' parameter must have one of the following values: 1841 */ 1842 #define PNG_CHUNK_WARNING 0 /* never an error */ 1843 #define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */ 1844 #define PNG_CHUNK_ERROR 2 /* always an error */ 1845 1846 /* ASCII to FP interfaces, currently only implemented if sCAL 1847 * support is required. 1848 */ 1849 #if defined(PNG_sCAL_SUPPORTED) 1850 /* MAX_DIGITS is actually the maximum number of characters in an sCAL 1851 * width or height, derived from the precision (number of significant 1852 * digits - a build time settable option) and assumptions about the 1853 * maximum ridiculous exponent. 1854 */ 1855 #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/) 1856 1857 #ifdef PNG_FLOATING_POINT_SUPPORTED 1858 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr, 1859 png_charp ascii, size_t size, double fp, unsigned int precision), 1860 PNG_EMPTY); 1861 #endif /* FLOATING_POINT */ 1862 1863 #ifdef PNG_FIXED_POINT_SUPPORTED 1864 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr, 1865 png_charp ascii, size_t size, png_fixed_point fp),PNG_EMPTY); 1866 #endif /* FIXED_POINT */ 1867 #endif /* sCAL */ 1868 1869 #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) 1870 /* An internal API to validate the format of a floating point number. 1871 * The result is the index of the next character. If the number is 1872 * not valid it will be the index of a character in the supposed number. 1873 * 1874 * The format of a number is defined in the PNG extensions specification 1875 * and this API is strictly conformant to that spec, not anyone elses! 1876 * 1877 * The format as a regular expression is: 1878 * 1879 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)? 1880 * 1881 * or: 1882 * 1883 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)? 1884 * 1885 * The complexity is that either integer or fraction must be present and the 1886 * fraction is permitted to have no digits only if the integer is present. 1887 * 1888 * NOTE: The dangling E problem. 1889 * There is a PNG valid floating point number in the following: 1890 * 1891 * PNG floating point numbers are not greedy. 1892 * 1893 * Working this out requires *TWO* character lookahead (because of the 1894 * sign), the parser does not do this - it will fail at the 'r' - this 1895 * doesn't matter for PNG sCAL chunk values, but it requires more care 1896 * if the value were ever to be embedded in something more complex. Use 1897 * ANSI-C strtod if you need the lookahead. 1898 */ 1899 /* State table for the parser. */ 1900 #define PNG_FP_INTEGER 0 /* before or in integer */ 1901 #define PNG_FP_FRACTION 1 /* before or in fraction */ 1902 #define PNG_FP_EXPONENT 2 /* before or in exponent */ 1903 #define PNG_FP_STATE 3 /* mask for the above */ 1904 #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */ 1905 #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */ 1906 #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */ 1907 #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */ 1908 #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */ 1909 1910 /* These three values don't affect the parser. They are set but not used. 1911 */ 1912 #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */ 1913 #define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */ 1914 #define PNG_FP_NONZERO 256 /* A non-zero value */ 1915 #define PNG_FP_STICKY 448 /* The above three flags */ 1916 1917 /* This is available for the caller to store in 'state' if required. Do not 1918 * call the parser after setting it (the parser sometimes clears it.) 1919 */ 1920 #define PNG_FP_INVALID 512 /* Available for callers as a distinct value */ 1921 1922 /* Result codes for the parser (boolean - true meants ok, false means 1923 * not ok yet.) 1924 */ 1925 #define PNG_FP_MAYBE 0 /* The number may be valid in the future */ 1926 #define PNG_FP_OK 1 /* The number is valid */ 1927 1928 /* Tests on the sticky non-zero and negative flags. To pass these checks 1929 * the state must also indicate that the whole number is valid - this is 1930 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this 1931 * is equivalent to PNG_FP_OK above.) 1932 */ 1933 #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO) 1934 /* NZ_MASK: the string is valid and a non-zero negative value */ 1935 #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO) 1936 /* Z MASK: the string is valid and a non-zero value. */ 1937 /* PNG_FP_SAW_DIGIT: the string is valid. */ 1938 #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT) 1939 #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK) 1940 #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK) 1941 1942 /* The actual parser. This can be called repeatedly. It updates 1943 * the index into the string and the state variable (which must 1944 * be initialized to 0). It returns a result code, as above. There 1945 * is no point calling the parser any more if it fails to advance to 1946 * the end of the string - it is stuck on an invalid character (or 1947 * terminated by '\0'). 1948 * 1949 * Note that the pointer will consume an E or even an E+ and then leave 1950 * a 'maybe' state even though a preceding integer.fraction is valid. 1951 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was 1952 * a valid number. It's possible to recover from this by calling 1953 * the parser again (from the start, with state 0) but with a string 1954 * that omits the last character (i.e. set the size to the index of 1955 * the problem character.) This has not been tested within libpng. 1956 */ 1957 PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string, 1958 size_t size, int *statep, png_size_tp whereami),PNG_EMPTY); 1959 1960 /* This is the same but it checks a complete string and returns true 1961 * only if it just contains a floating point number. As of 1.5.4 this 1962 * function also returns the state at the end of parsing the number if 1963 * it was valid (otherwise it returns 0.) This can be used for testing 1964 * for negative or zero values using the sticky flag. 1965 */ 1966 PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string, 1967 size_t size),PNG_EMPTY); 1968 #endif /* pCAL || sCAL */ 1969 1970 #if defined(PNG_GAMMA_SUPPORTED) ||\ 1971 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED) 1972 /* Added at libpng version 1.5.0 */ 1973 /* This is a utility to provide a*times/div (rounded) and indicate 1974 * if there is an overflow. The result is a boolean - false (0) 1975 * for overflow, true (1) if no overflow, in which case *res 1976 * holds the result. 1977 */ 1978 PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a, 1979 png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY); 1980 #endif 1981 1982 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED) 1983 /* Same deal, but issue a warning on overflow and return 0. */ 1984 PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn, 1985 (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by, 1986 png_int_32 divided_by),PNG_EMPTY); 1987 #endif 1988 1989 #ifdef PNG_GAMMA_SUPPORTED 1990 /* Calculate a reciprocal - used for gamma values. This returns 1991 * 0 if the argument is 0 in order to maintain an undefined value; 1992 * there are no warnings. 1993 */ 1994 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a), 1995 PNG_EMPTY); 1996 1997 #ifdef PNG_READ_GAMMA_SUPPORTED 1998 /* The same but gives a reciprocal of the product of two fixed point 1999 * values. Accuracy is suitable for gamma calculations but this is 2000 * not exact - use png_muldiv for that. Only required at present on read. 2001 */ 2002 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a, 2003 png_fixed_point b),PNG_EMPTY); 2004 #endif 2005 2006 /* Return true if the gamma value is significantly different from 1.0 */ 2007 PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value), 2008 PNG_EMPTY); 2009 #endif 2010 2011 #ifdef PNG_READ_GAMMA_SUPPORTED 2012 /* Internal fixed point gamma correction. These APIs are called as 2013 * required to convert single values - they don't need to be fast, 2014 * they are not used when processing image pixel values. 2015 * 2016 * While the input is an 'unsigned' value it must actually be the 2017 * correct bit value - 0..255 or 0..65535 as required. 2018 */ 2019 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr, 2020 unsigned int value, png_fixed_point gamma_value),PNG_EMPTY); 2021 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value, 2022 png_fixed_point gamma_value),PNG_EMPTY); 2023 PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value, 2024 png_fixed_point gamma_value),PNG_EMPTY); 2025 PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr), 2026 PNG_EMPTY); 2027 PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr, 2028 int bit_depth),PNG_EMPTY); 2029 #endif 2030 2031 /* SIMPLIFIED READ/WRITE SUPPORT */ 2032 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 2033 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 2034 /* The internal structure that png_image::opaque points to. */ 2035 typedef struct png_control 2036 { 2037 png_structp png_ptr; 2038 png_infop info_ptr; 2039 png_voidp error_buf; /* Always a jmp_buf at present. */ 2040 2041 png_const_bytep memory; /* Memory buffer. */ 2042 size_t size; /* Size of the memory buffer. */ 2043 2044 unsigned int for_write :1; /* Otherwise it is a read structure */ 2045 unsigned int owned_file :1; /* We own the file in io_ptr */ 2046 } png_control; 2047 2048 /* Return the pointer to the jmp_buf from a png_control: necessary because C 2049 * does not reveal the type of the elements of jmp_buf. 2050 */ 2051 #ifdef __cplusplus 2052 # define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0]) 2053 #else 2054 # define png_control_jmp_buf(pc) ((pc)->error_buf) 2055 #endif 2056 2057 /* Utility to safely execute a piece of libpng code catching and logging any 2058 * errors that might occur. Returns true on success, false on failure (either 2059 * of the function or as a result of a png_error.) 2060 */ 2061 PNG_INTERNAL_CALLBACK(void,png_safe_error,(png_structp png_ptr, 2062 png_const_charp error_message),PNG_NORETURN); 2063 2064 #ifdef PNG_WARNINGS_SUPPORTED 2065 PNG_INTERNAL_CALLBACK(void,png_safe_warning,(png_structp png_ptr, 2066 png_const_charp warning_message),PNG_EMPTY); 2067 #else 2068 # define png_safe_warning 0/*dummy argument*/ 2069 #endif 2070 2071 PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image, 2072 int (*function)(png_voidp), png_voidp arg),PNG_EMPTY); 2073 2074 /* Utility to log an error; this also cleans up the png_image; the function 2075 * always returns 0 (false). 2076 */ 2077 PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image, 2078 png_const_charp error_message),PNG_EMPTY); 2079 2080 #ifndef PNG_SIMPLIFIED_READ_SUPPORTED 2081 /* png_image_free is used by the write code but not exported */ 2082 PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY); 2083 #endif /* !SIMPLIFIED_READ */ 2084 2085 #endif /* SIMPLIFIED READ/WRITE */ 2086 2087 /* These are initialization functions for hardware specific PNG filter 2088 * optimizations; list these here then select the appropriate one at compile 2089 * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined 2090 * the generic code is used. 2091 */ 2092 #ifdef PNG_FILTER_OPTIMIZATIONS 2093 PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr, 2094 unsigned int bpp), PNG_EMPTY); 2095 /* Just declare the optimization that will be used */ 2096 #else 2097 /* List *all* the possible optimizations here - this branch is required if 2098 * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in 2099 * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing. 2100 */ 2101 # if PNG_ARM_NEON_OPT > 0 2102 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon, 2103 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2104 #endif 2105 2106 #if PNG_MIPS_MSA_OPT > 0 2107 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_msa, 2108 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2109 #endif 2110 2111 # if PNG_INTEL_SSE_IMPLEMENTATION > 0 2112 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_sse2, 2113 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2114 # endif 2115 #endif 2116 2117 PNG_INTERNAL_FUNCTION(png_uint_32, png_check_keyword, (png_structrp png_ptr, 2118 png_const_charp key, png_bytep new_key), PNG_EMPTY); 2119 2120 #if PNG_ARM_NEON_IMPLEMENTATION == 1 2121 PNG_INTERNAL_FUNCTION(void, 2122 png_riffle_palette_neon, 2123 (png_structrp), 2124 PNG_EMPTY); 2125 PNG_INTERNAL_FUNCTION(int, 2126 png_do_expand_palette_rgba8_neon, 2127 (png_structrp, 2128 png_row_infop, 2129 png_const_bytep, 2130 const png_bytepp, 2131 const png_bytepp), 2132 PNG_EMPTY); 2133 PNG_INTERNAL_FUNCTION(int, 2134 png_do_expand_palette_rgb8_neon, 2135 (png_structrp, 2136 png_row_infop, 2137 png_const_bytep, 2138 const png_bytepp, 2139 const png_bytepp), 2140 PNG_EMPTY); 2141 #endif 2142 2143 /* Maintainer: Put new private prototypes here ^ */ 2144 2145 #include "pngdebug.h" 2146 2147 #ifdef __cplusplus 2148 } 2149 #endif 2150 2151 #endif /* PNG_VERSION_INFO_ONLY */ 2152 #endif /* PNGPRIV_H */ 2153