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 #ifdef PNG_APNG_SUPPORTED 641 #define PNG_HAVE_acTL 0x10000U 642 #define PNG_HAVE_fcTL 0x20000U 643 #endif 644 645 /* Flags for the transformations the PNG library does on the image data */ 646 #define PNG_BGR 0x0001U 647 #define PNG_INTERLACE 0x0002U 648 #define PNG_PACK 0x0004U 649 #define PNG_SHIFT 0x0008U 650 #define PNG_SWAP_BYTES 0x0010U 651 #define PNG_INVERT_MONO 0x0020U 652 #define PNG_QUANTIZE 0x0040U 653 #define PNG_COMPOSE 0x0080U /* Was PNG_BACKGROUND */ 654 #define PNG_BACKGROUND_EXPAND 0x0100U 655 #define PNG_EXPAND_16 0x0200U /* Added to libpng 1.5.2 */ 656 #define PNG_16_TO_8 0x0400U /* Becomes 'chop' in 1.5.4 */ 657 #define PNG_RGBA 0x0800U 658 #define PNG_EXPAND 0x1000U 659 #define PNG_GAMMA 0x2000U 660 #define PNG_GRAY_TO_RGB 0x4000U 661 #define PNG_FILLER 0x8000U 662 #define PNG_PACKSWAP 0x10000U 663 #define PNG_SWAP_ALPHA 0x20000U 664 #define PNG_STRIP_ALPHA 0x40000U 665 #define PNG_INVERT_ALPHA 0x80000U 666 #define PNG_USER_TRANSFORM 0x100000U 667 #define PNG_RGB_TO_GRAY_ERR 0x200000U 668 #define PNG_RGB_TO_GRAY_WARN 0x400000U 669 #define PNG_RGB_TO_GRAY 0x600000U /* two bits, RGB_TO_GRAY_ERR|WARN */ 670 #define PNG_ENCODE_ALPHA 0x800000U /* Added to libpng-1.5.4 */ 671 #define PNG_ADD_ALPHA 0x1000000U /* Added to libpng-1.2.7 */ 672 #define PNG_EXPAND_tRNS 0x2000000U /* Added to libpng-1.2.9 */ 673 #define PNG_SCALE_16_TO_8 0x4000000U /* Added to libpng-1.5.4 */ 674 /* 0x8000000U unused */ 675 /* 0x10000000U unused */ 676 /* 0x20000000U unused */ 677 /* 0x40000000U unused */ 678 /* Flags for png_create_struct */ 679 #define PNG_STRUCT_PNG 0x0001U 680 #define PNG_STRUCT_INFO 0x0002U 681 682 /* Flags for the png_ptr->flags rather than declaring a byte for each one */ 683 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001U 684 #define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002U /* Added to libpng-1.6.0 */ 685 /* 0x0004U unused */ 686 #define PNG_FLAG_ZSTREAM_ENDED 0x0008U /* Added to libpng-1.6.0 */ 687 /* 0x0010U unused */ 688 /* 0x0020U unused */ 689 #define PNG_FLAG_ROW_INIT 0x0040U 690 #define PNG_FLAG_FILLER_AFTER 0x0080U 691 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100U 692 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200U 693 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400U 694 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800U 695 #define PNG_FLAG_ASSUME_sRGB 0x1000U /* Added to libpng-1.5.4 */ 696 #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000U /* Added to libpng-1.5.4 */ 697 #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000U /* Added to libpng-1.5.4 */ 698 /* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000U */ 699 /* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000U */ 700 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000U 701 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000U 702 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000U 703 #define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000U /* Added to libpng-1.4.0 */ 704 #define PNG_FLAG_APP_WARNINGS_WARN 0x200000U /* Added to libpng-1.6.0 */ 705 #define PNG_FLAG_APP_ERRORS_WARN 0x400000U /* Added to libpng-1.6.0 */ 706 /* 0x800000U unused */ 707 /* 0x1000000U unused */ 708 /* 0x2000000U unused */ 709 /* 0x4000000U unused */ 710 /* 0x8000000U unused */ 711 /* 0x10000000U unused */ 712 /* 0x20000000U unused */ 713 /* 0x40000000U unused */ 714 715 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 716 PNG_FLAG_CRC_ANCILLARY_NOWARN) 717 718 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 719 PNG_FLAG_CRC_CRITICAL_IGNORE) 720 721 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 722 PNG_FLAG_CRC_CRITICAL_MASK) 723 724 /* Save typing and make code easier to understand */ 725 726 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 727 abs((int)((c1).green) - (int)((c2).green)) + \ 728 abs((int)((c1).blue) - (int)((c2).blue))) 729 730 /* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255 731 * by dividing by 257 *with rounding*. This macro is exact for the given range. 732 * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the 733 * macro were established by experiment (modifying the added value). The macro 734 * has a second variant that takes a value already scaled by 255 and divides by 735 * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it 736 * only gives off-by-one errors and only for 0.5% (1 in 200) of the values. 737 */ 738 #define PNG_DIV65535(v24) (((v24) + 32895) >> 16) 739 #define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255) 740 741 /* Added to libpng-1.2.6 JB */ 742 #define PNG_ROWBYTES(pixel_bits, width) \ 743 ((pixel_bits) >= 8 ? \ 744 ((size_t)(width) * (((size_t)(pixel_bits)) >> 3)) : \ 745 (( ((size_t)(width) * ((size_t)(pixel_bits))) + 7) >> 3) ) 746 747 /* This returns the number of trailing bits in the last byte of a row, 0 if the 748 * last byte is completely full of pixels. It is, in principle, (pixel_bits x 749 * width) % 8, but that would overflow for large 'width'. The second macro is 750 * the same except that it returns the number of unused bits in the last byte; 751 * (8-TRAILBITS), but 0 when TRAILBITS is 0. 752 * 753 * NOTE: these macros are intended to be self-evidently correct and never 754 * overflow on the assumption that pixel_bits is in the range 0..255. The 755 * arguments are evaluated only once and they can be signed (e.g. as a result of 756 * the integral promotions). The result of the expression always has type 757 * (png_uint_32), however the compiler always knows it is in the range 0..7. 758 */ 759 #define PNG_TRAILBITS(pixel_bits, width) \ 760 (((pixel_bits) * ((width) % (png_uint_32)8)) % 8) 761 762 #define PNG_PADBITS(pixel_bits, width) \ 763 ((8 - PNG_TRAILBITS(pixel_bits, width)) % 8) 764 765 /* PNG_OUT_OF_RANGE returns true if value is outside the range 766 * ideal-delta..ideal+delta. Each argument is evaluated twice. 767 * "ideal" and "delta" should be constants, normally simple 768 * integers, "value" a variable. Added to libpng-1.2.6 JB 769 */ 770 #define PNG_OUT_OF_RANGE(value, ideal, delta) \ 771 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 772 773 /* Conversions between fixed and floating point, only defined if 774 * required (to make sure the code doesn't accidentally use float 775 * when it is supposedly disabled.) 776 */ 777 #ifdef PNG_FLOATING_POINT_SUPPORTED 778 /* The floating point conversion can't overflow, though it can and 779 * does lose accuracy relative to the original fixed point value. 780 * In practice this doesn't matter because png_fixed_point only 781 * stores numbers with very low precision. The png_ptr and s 782 * arguments are unused by default but are there in case error 783 * checking becomes a requirement. 784 */ 785 #define png_float(png_ptr, fixed, s) (.00001 * (fixed)) 786 787 /* The fixed point conversion performs range checking and evaluates 788 * its argument multiple times, so must be used with care. The 789 * range checking uses the PNG specification values for a signed 790 * 32-bit fixed point value except that the values are deliberately 791 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly 792 * (2^31-1) * 100000). 's' is a string that describes the value being 793 * converted. 794 * 795 * NOTE: this macro will raise a png_error if the range check fails, 796 * therefore it is normally only appropriate to use this on values 797 * that come from API calls or other sources where an out of range 798 * error indicates a programming error, not a data error! 799 * 800 * NOTE: by default this is off - the macro is not used - because the 801 * function call saves a lot of code. 802 */ 803 #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED 804 #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\ 805 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0)) 806 #endif 807 /* else the corresponding function is defined below, inside the scope of the 808 * cplusplus test. 809 */ 810 #endif 811 812 /* Constants for known chunk types. If you need to add a chunk, define the name 813 * here. For historical reasons these constants have the form png_<name>; i.e. 814 * the prefix is lower case. Please use decimal values as the parameters to 815 * match the ISO PNG specification and to avoid relying on the C locale 816 * interpretation of character values. 817 * 818 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values 819 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string 820 * to be generated if required. 821 * 822 * PNG_32b correctly produces a value shifted by up to 24 bits, even on 823 * architectures where (int) is only 16 bits. 824 */ 825 #define PNG_32b(b,s) ((png_uint_32)(b) << (s)) 826 #define PNG_U32(b1,b2,b3,b4) \ 827 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0)) 828 829 /* Constants for known chunk types. 830 * 831 * MAINTAINERS: If you need to add a chunk, define the name here. 832 * For historical reasons these constants have the form png_<name>; i.e. 833 * the prefix is lower case. Please use decimal values as the parameters to 834 * match the ISO PNG specification and to avoid relying on the C locale 835 * interpretation of character values. Please keep the list sorted. 836 * 837 * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk 838 * type. In fact the specification does not express chunk types this way, 839 * however using a 32-bit value means that the chunk type can be read from the 840 * stream using exactly the same code as used for a 32-bit unsigned value and 841 * can be examined far more efficiently (using one arithmetic compare). 842 * 843 * Prior to 1.5.6 the chunk type constants were expressed as C strings. The 844 * libpng API still uses strings for 'unknown' chunks and a macro, 845 * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice 846 * that for portable code numeric values must still be used; the string "IHDR" 847 * is not portable and neither is PNG_U32('I', 'H', 'D', 'R'). 848 * 849 * In 1.7.0 the definitions will be made public in png.h to avoid having to 850 * duplicate the same definitions in application code. 851 */ 852 #define png_IDAT PNG_U32( 73, 68, 65, 84) 853 #define png_IEND PNG_U32( 73, 69, 78, 68) 854 #define png_IHDR PNG_U32( 73, 72, 68, 82) 855 #define png_PLTE PNG_U32( 80, 76, 84, 69) 856 #define png_bKGD PNG_U32( 98, 75, 71, 68) 857 #define png_cHRM PNG_U32( 99, 72, 82, 77) 858 #define png_eXIf PNG_U32(101, 88, 73, 102) /* registered July 2017 */ 859 #define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */ 860 #define png_gAMA PNG_U32(103, 65, 77, 65) 861 #define png_gIFg PNG_U32(103, 73, 70, 103) 862 #define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */ 863 #define png_gIFx PNG_U32(103, 73, 70, 120) 864 #define png_hIST PNG_U32(104, 73, 83, 84) 865 #define png_iCCP PNG_U32(105, 67, 67, 80) 866 #define png_iTXt PNG_U32(105, 84, 88, 116) 867 #define png_oFFs PNG_U32(111, 70, 70, 115) 868 #define png_pCAL PNG_U32(112, 67, 65, 76) 869 #define png_pHYs PNG_U32(112, 72, 89, 115) 870 #define png_sBIT PNG_U32(115, 66, 73, 84) 871 #define png_sCAL PNG_U32(115, 67, 65, 76) 872 #define png_sPLT PNG_U32(115, 80, 76, 84) 873 #define png_sRGB PNG_U32(115, 82, 71, 66) 874 #define png_sTER PNG_U32(115, 84, 69, 82) 875 #define png_tEXt PNG_U32(116, 69, 88, 116) 876 #define png_tIME PNG_U32(116, 73, 77, 69) 877 #define png_tRNS PNG_U32(116, 82, 78, 83) 878 #define png_zTXt PNG_U32(122, 84, 88, 116) 879 880 #ifdef PNG_APNG_SUPPORTED 881 #define png_acTL PNG_U32( 97, 99, 84, 76) 882 #define png_fcTL PNG_U32(102, 99, 84, 76) 883 #define png_fdAT PNG_U32(102, 100, 65, 84) 884 885 /* For png_struct.apng_flags: */ 886 #define PNG_FIRST_FRAME_HIDDEN 0x0001U 887 #define PNG_APNG_APP 0x0002U 888 #endif 889 890 /* The following will work on (signed char*) strings, whereas the get_uint_32 891 * macro will fail on top-bit-set values because of the sign extension. 892 */ 893 #define PNG_CHUNK_FROM_STRING(s)\ 894 PNG_U32(0xff & (s)[0], 0xff & (s)[1], 0xff & (s)[2], 0xff & (s)[3]) 895 896 /* This uses (char), not (png_byte) to avoid warnings on systems where (char) is 897 * signed and the argument is a (char[]) This macro will fail miserably on 898 * systems where (char) is more than 8 bits. 899 */ 900 #define PNG_STRING_FROM_CHUNK(s,c)\ 901 (void)(((char*)(s))[0]=(char)(((c)>>24) & 0xff), \ 902 ((char*)(s))[1]=(char)(((c)>>16) & 0xff),\ 903 ((char*)(s))[2]=(char)(((c)>>8) & 0xff), \ 904 ((char*)(s))[3]=(char)((c & 0xff))) 905 906 /* Do the same but terminate with a null character. */ 907 #define PNG_CSTRING_FROM_CHUNK(s,c)\ 908 (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0) 909 910 /* Test on flag values as defined in the spec (section 5.4): */ 911 #define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29)) 912 #define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c)) 913 #define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21)) 914 #define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13)) 915 #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5)) 916 917 /* Gamma values (new at libpng-1.5.4): */ 918 #define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */ 919 #define PNG_GAMMA_MAC_INVERSE 65909 920 #define PNG_GAMMA_sRGB_INVERSE 45455 921 922 /* Almost everything below is C specific; the #defines above can be used in 923 * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot. 924 */ 925 #ifndef PNG_VERSION_INFO_ONLY 926 927 #include "pngstruct.h" 928 #include "pnginfo.h" 929 930 /* Validate the include paths - the include path used to generate pnglibconf.h 931 * must match that used in the build, or we must be using pnglibconf.h.prebuilt: 932 */ 933 #if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM 934 # error ZLIB_VERNUM != PNG_ZLIB_VERNUM \ 935 "-I (include path) error: see the notes in pngpriv.h" 936 /* This means that when pnglibconf.h was built the copy of zlib.h that it 937 * used is not the same as the one being used here. Because the build of 938 * libpng makes decisions to use inflateInit2 and inflateReset2 based on the 939 * zlib version number and because this affects handling of certain broken 940 * PNG files the -I directives must match. 941 * 942 * The most likely explanation is that you passed a -I in CFLAGS. This will 943 * not work; all the preprocessor directives and in particular all the -I 944 * directives must be in CPPFLAGS. 945 */ 946 #endif 947 948 /* This is used for 16-bit gamma tables -- only the top level pointers are 949 * const; this could be changed: 950 */ 951 typedef const png_uint_16p * png_const_uint_16pp; 952 953 /* Added to libpng-1.5.7: sRGB conversion tables */ 954 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 955 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 956 #ifdef PNG_SIMPLIFIED_READ_SUPPORTED 957 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]); 958 /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value, 959 * 0..65535. This table gives the closest 16-bit answers (no errors). 960 */ 961 #endif 962 963 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]); 964 PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]); 965 966 #define PNG_sRGB_FROM_LINEAR(linear) \ 967 ((png_byte)(0xff & ((png_sRGB_base[(linear)>>15] \ 968 + ((((linear) & 0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8))) 969 /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB 970 * encoded value with maximum error 0.646365. Note that the input is not a 971 * 16-bit value; it has been multiplied by 255! */ 972 #endif /* SIMPLIFIED_READ/WRITE */ 973 974 975 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 976 #ifdef __cplusplus 977 extern "C" { 978 #endif /* __cplusplus */ 979 980 /* Internal functions; these are not exported from a DLL however because they 981 * are used within several of the C source files they have to be C extern. 982 * 983 * All of these functions must be declared with PNG_INTERNAL_FUNCTION. 984 */ 985 986 /* Zlib support */ 987 #define PNG_UNEXPECTED_ZLIB_RETURN (-7) 988 PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret), 989 PNG_EMPTY); 990 /* Used by the zlib handling functions to ensure that z_stream::msg is always 991 * set before they return. 992 */ 993 994 #ifdef PNG_WRITE_SUPPORTED 995 PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr, 996 png_compression_bufferp *list),PNG_EMPTY); 997 /* Free the buffer list used by the compressed write code. */ 998 #endif 999 1000 #if defined(PNG_FLOATING_POINT_SUPPORTED) && \ 1001 !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \ 1002 (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \ 1003 defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \ 1004 defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \ 1005 (defined(PNG_sCAL_SUPPORTED) && \ 1006 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)) 1007 PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr, 1008 double fp, png_const_charp text),PNG_EMPTY); 1009 #endif 1010 1011 /* Check the user version string for compatibility, returns false if the version 1012 * numbers aren't compatible. 1013 */ 1014 PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr, 1015 png_const_charp user_png_ver),PNG_EMPTY); 1016 1017 /* Internal base allocator - no messages, NULL on failure to allocate. This 1018 * does, however, call the application provided allocator and that could call 1019 * png_error (although that would be a bug in the application implementation.) 1020 */ 1021 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr, 1022 png_alloc_size_t size),PNG_ALLOCATED); 1023 1024 #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\ 1025 defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED) 1026 /* Internal array allocator, outputs no error or warning messages on failure, 1027 * just returns NULL. 1028 */ 1029 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr, 1030 int nelements, size_t element_size),PNG_ALLOCATED); 1031 1032 /* The same but an existing array is extended by add_elements. This function 1033 * also memsets the new elements to 0 and copies the old elements. The old 1034 * array is not freed or altered. 1035 */ 1036 PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr, 1037 png_const_voidp array, int old_elements, int add_elements, 1038 size_t element_size),PNG_ALLOCATED); 1039 #endif /* text, sPLT or unknown chunks */ 1040 1041 /* Magic to create a struct when there is no struct to call the user supplied 1042 * memory allocators. Because error handling has not been set up the memory 1043 * handlers can't safely call png_error, but this is an obscure and undocumented 1044 * restriction so libpng has to assume that the 'free' handler, at least, might 1045 * call png_error. 1046 */ 1047 PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct, 1048 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, 1049 png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, 1050 png_free_ptr free_fn),PNG_ALLOCATED); 1051 1052 /* Free memory from internal libpng struct */ 1053 PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr), 1054 PNG_EMPTY); 1055 1056 /* Free an allocated jmp_buf (always succeeds) */ 1057 PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY); 1058 1059 /* Function to allocate memory for zlib. PNGAPI is disallowed. */ 1060 PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size), 1061 PNG_ALLOCATED); 1062 1063 /* Function to free memory for zlib. PNGAPI is disallowed. */ 1064 PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY); 1065 1066 /* Next four functions are used internally as callbacks. PNGCBAPI is required 1067 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to 1068 * PNGCBAPI at 1.5.0 1069 */ 1070 1071 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr, 1072 png_bytep data, size_t length),PNG_EMPTY); 1073 1074 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1075 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr, 1076 png_bytep buffer, size_t length),PNG_EMPTY); 1077 #endif 1078 1079 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr, 1080 png_bytep data, size_t length),PNG_EMPTY); 1081 1082 #ifdef PNG_WRITE_FLUSH_SUPPORTED 1083 # ifdef PNG_STDIO_SUPPORTED 1084 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr), 1085 PNG_EMPTY); 1086 # endif 1087 #endif 1088 1089 /* Reset the CRC variable */ 1090 PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY); 1091 1092 /* Write the "data" buffer to whatever output you are using */ 1093 PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr, 1094 png_const_bytep data, size_t length),PNG_EMPTY); 1095 1096 /* Read and check the PNG file signature */ 1097 PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr, 1098 png_inforp info_ptr),PNG_EMPTY); 1099 1100 /* Read the chunk header (length + type name) */ 1101 PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr), 1102 PNG_EMPTY); 1103 1104 /* Read data from whatever input you are using into the "data" buffer */ 1105 PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data, 1106 size_t length),PNG_EMPTY); 1107 1108 /* Read bytes into buf, and update png_ptr->crc */ 1109 PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf, 1110 png_uint_32 length),PNG_EMPTY); 1111 1112 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 1113 PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr, 1114 png_uint_32 skip),PNG_EMPTY); 1115 1116 /* Read the CRC from the file and compare it to the libpng calculated CRC */ 1117 PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY); 1118 1119 /* Calculate the CRC over a section of data. Note that we are only 1120 * passing a maximum of 64K on systems that have this as a memory limit, 1121 * since this is the maximum buffer size we can specify. 1122 */ 1123 PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr, 1124 png_const_bytep ptr, size_t length),PNG_EMPTY); 1125 1126 #ifdef PNG_WRITE_FLUSH_SUPPORTED 1127 PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY); 1128 #endif 1129 1130 /* Write various chunks */ 1131 1132 /* Write the IHDR chunk, and update the png_struct with the necessary 1133 * information. 1134 */ 1135 PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr, 1136 png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, 1137 int compression_method, int filter_method, int interlace_method),PNG_EMPTY); 1138 1139 PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr, 1140 png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY); 1141 1142 PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr, 1143 png_const_bytep row_data, png_alloc_size_t row_data_length, int flush), 1144 PNG_EMPTY); 1145 1146 PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY); 1147 1148 #ifdef PNG_WRITE_gAMA_SUPPORTED 1149 PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr, 1150 png_fixed_point file_gamma),PNG_EMPTY); 1151 #endif 1152 1153 #ifdef PNG_WRITE_sBIT_SUPPORTED 1154 PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr, 1155 png_const_color_8p sbit, int color_type),PNG_EMPTY); 1156 #endif 1157 1158 #ifdef PNG_WRITE_cHRM_SUPPORTED 1159 PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr, 1160 const png_xy *xy), PNG_EMPTY); 1161 /* The xy value must have been previously validated */ 1162 #endif 1163 1164 #ifdef PNG_WRITE_sRGB_SUPPORTED 1165 PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr, 1166 int intent),PNG_EMPTY); 1167 #endif 1168 1169 #ifdef PNG_WRITE_eXIf_SUPPORTED 1170 PNG_INTERNAL_FUNCTION(void,png_write_eXIf,(png_structrp png_ptr, 1171 png_bytep exif, int num_exif),PNG_EMPTY); 1172 #endif 1173 1174 #ifdef PNG_WRITE_iCCP_SUPPORTED 1175 PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr, 1176 png_const_charp name, png_const_bytep profile), PNG_EMPTY); 1177 /* The profile must have been previously validated for correctness, the 1178 * length comes from the first four bytes. Only the base, deflate, 1179 * compression is supported. 1180 */ 1181 #endif 1182 1183 #ifdef PNG_WRITE_sPLT_SUPPORTED 1184 PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr, 1185 png_const_sPLT_tp palette),PNG_EMPTY); 1186 #endif 1187 1188 #ifdef PNG_WRITE_tRNS_SUPPORTED 1189 PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr, 1190 png_const_bytep trans, png_const_color_16p values, int number, 1191 int color_type),PNG_EMPTY); 1192 #endif 1193 1194 #ifdef PNG_WRITE_bKGD_SUPPORTED 1195 PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr, 1196 png_const_color_16p values, int color_type),PNG_EMPTY); 1197 #endif 1198 1199 #ifdef PNG_WRITE_hIST_SUPPORTED 1200 PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr, 1201 png_const_uint_16p hist, int num_hist),PNG_EMPTY); 1202 #endif 1203 1204 /* Chunks that have keywords */ 1205 #ifdef PNG_WRITE_tEXt_SUPPORTED 1206 PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr, 1207 png_const_charp key, png_const_charp text, size_t text_len),PNG_EMPTY); 1208 #endif 1209 1210 #ifdef PNG_WRITE_zTXt_SUPPORTED 1211 PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp 1212 key, png_const_charp text, int compression),PNG_EMPTY); 1213 #endif 1214 1215 #ifdef PNG_WRITE_iTXt_SUPPORTED 1216 PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr, 1217 int compression, png_const_charp key, png_const_charp lang, 1218 png_const_charp lang_key, png_const_charp text),PNG_EMPTY); 1219 #endif 1220 1221 #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ 1222 PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr, 1223 png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY); 1224 #endif 1225 1226 #ifdef PNG_WRITE_oFFs_SUPPORTED 1227 PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr, 1228 png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY); 1229 #endif 1230 1231 #ifdef PNG_WRITE_pCAL_SUPPORTED 1232 PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr, 1233 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, 1234 png_const_charp units, png_charpp params),PNG_EMPTY); 1235 #endif 1236 1237 #ifdef PNG_WRITE_pHYs_SUPPORTED 1238 PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr, 1239 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 1240 int unit_type),PNG_EMPTY); 1241 #endif 1242 1243 #ifdef PNG_WRITE_tIME_SUPPORTED 1244 PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr, 1245 png_const_timep mod_time),PNG_EMPTY); 1246 #endif 1247 1248 #ifdef PNG_WRITE_sCAL_SUPPORTED 1249 PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr, 1250 int unit, png_const_charp width, png_const_charp height),PNG_EMPTY); 1251 #endif 1252 1253 /* Called when finished processing a row of data */ 1254 PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr), 1255 PNG_EMPTY); 1256 1257 /* Internal use only. Called before first row of data */ 1258 PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr), 1259 PNG_EMPTY); 1260 1261 /* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an 1262 * array of png_ptr->width pixels. If the image is not interlaced or this 1263 * is the final pass this just does a memcpy, otherwise the "display" flag 1264 * is used to determine whether to copy pixels that are not in the current pass. 1265 * 1266 * Because 'png_do_read_interlace' (below) replicates pixels this allows this 1267 * function to achieve the documented 'blocky' appearance during interlaced read 1268 * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row' 1269 * are not changed if they are not in the current pass, when display is 0. 1270 * 1271 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless. 1272 * 1273 * The API always reads from the png_struct row buffer and always assumes that 1274 * it is full width (png_do_read_interlace has already been called.) 1275 * 1276 * This function is only ever used to write to row buffers provided by the 1277 * caller of the relevant libpng API and the row must have already been 1278 * transformed by the read transformations. 1279 * 1280 * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed 1281 * bitmasks for use within the code, otherwise runtime generated masks are used. 1282 * The default is compile time masks. 1283 */ 1284 #ifndef PNG_USE_COMPILE_TIME_MASKS 1285 # define PNG_USE_COMPILE_TIME_MASKS 1 1286 #endif 1287 PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr, 1288 png_bytep row, int display),PNG_EMPTY); 1289 1290 #ifdef PNG_READ_INTERLACING_SUPPORTED 1291 /* Expand an interlaced row: the 'row_info' describes the pass data that has 1292 * been read in and must correspond to the pixels in 'row', the pixels are 1293 * expanded (moved apart) in 'row' to match the final layout, when doing this 1294 * the pixels are *replicated* to the intervening space. This is essential for 1295 * the correct operation of png_combine_row, above. 1296 */ 1297 PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info, 1298 png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY); 1299 #endif 1300 1301 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 1302 1303 #ifdef PNG_WRITE_INTERLACING_SUPPORTED 1304 /* Grab pixels out of a row for an interlaced pass */ 1305 PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info, 1306 png_bytep row, int pass),PNG_EMPTY); 1307 #endif 1308 1309 /* Unfilter a row: check the filter value before calling this, there is no point 1310 * calling it for PNG_FILTER_VALUE_NONE. 1311 */ 1312 PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop 1313 row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY); 1314 1315 #if PNG_ARM_NEON_OPT > 0 1316 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info, 1317 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1318 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop 1319 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1320 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop 1321 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1322 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop 1323 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1324 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop 1325 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1326 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop 1327 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1328 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop 1329 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1330 #endif 1331 1332 #if PNG_MIPS_MSA_OPT > 0 1333 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_msa,(png_row_infop row_info, 1334 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1335 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_msa,(png_row_infop 1336 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1337 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_msa,(png_row_infop 1338 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1339 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_msa,(png_row_infop 1340 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1341 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_msa,(png_row_infop 1342 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1343 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_msa,(png_row_infop 1344 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1345 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_msa,(png_row_infop 1346 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1347 #endif 1348 1349 #if PNG_POWERPC_VSX_OPT > 0 1350 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_vsx,(png_row_infop row_info, 1351 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1352 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_vsx,(png_row_infop 1353 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1354 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_vsx,(png_row_infop 1355 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1356 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_vsx,(png_row_infop 1357 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1358 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_vsx,(png_row_infop 1359 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1360 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_vsx,(png_row_infop 1361 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1362 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_vsx,(png_row_infop 1363 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1364 #endif 1365 1366 #if PNG_INTEL_SSE_IMPLEMENTATION > 0 1367 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_sse2,(png_row_infop 1368 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1369 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_sse2,(png_row_infop 1370 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1371 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_sse2,(png_row_infop 1372 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1373 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_sse2,(png_row_infop 1374 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1375 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_sse2,(png_row_infop 1376 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1377 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_sse2,(png_row_infop 1378 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1379 #endif 1380 1381 /* Choose the best filter to use and filter the row data */ 1382 PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr, 1383 png_row_infop row_info),PNG_EMPTY); 1384 1385 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED 1386 PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr, 1387 png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY); 1388 /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer 1389 * is NULL the function checks, instead, for the end of the stream. In this 1390 * case a benign error will be issued if the stream end is not found or if 1391 * extra data has to be consumed. 1392 */ 1393 PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr), 1394 PNG_EMPTY); 1395 /* This cleans up when the IDAT LZ stream does not end when the last image 1396 * byte is read; there is still some pending input. 1397 */ 1398 1399 PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr), 1400 PNG_EMPTY); 1401 /* Finish a row while reading, dealing with interlacing passes, etc. */ 1402 #endif /* SEQUENTIAL_READ */ 1403 1404 /* Initialize the row buffers, etc. */ 1405 PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY); 1406 1407 #if ZLIB_VERNUM >= 0x1240 1408 PNG_INTERNAL_FUNCTION(int,png_zlib_inflate,(png_structrp png_ptr, int flush), 1409 PNG_EMPTY); 1410 # define PNG_INFLATE(pp, flush) png_zlib_inflate(pp, flush) 1411 #else /* Zlib < 1.2.4 */ 1412 # define PNG_INFLATE(pp, flush) inflate(&(pp)->zstream, flush) 1413 #endif /* Zlib < 1.2.4 */ 1414 1415 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1416 /* Optional call to update the users info structure */ 1417 PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr, 1418 png_inforp info_ptr),PNG_EMPTY); 1419 #endif 1420 1421 /* Shared transform functions, defined in pngtran.c */ 1422 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 1423 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 1424 PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info, 1425 png_bytep row, int at_start),PNG_EMPTY); 1426 #endif 1427 1428 #ifdef PNG_16BIT_SUPPORTED 1429 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 1430 PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info, 1431 png_bytep row),PNG_EMPTY); 1432 #endif 1433 #endif 1434 1435 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ 1436 defined(PNG_WRITE_PACKSWAP_SUPPORTED) 1437 PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info, 1438 png_bytep row),PNG_EMPTY); 1439 #endif 1440 1441 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 1442 PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info, 1443 png_bytep row),PNG_EMPTY); 1444 #endif 1445 1446 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1447 PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info, 1448 png_bytep row),PNG_EMPTY); 1449 #endif 1450 1451 /* The following decodes the appropriate chunks, and does error correction, 1452 * then calls the appropriate callback for the chunk if it is valid. 1453 */ 1454 1455 /* Decode the IHDR chunk */ 1456 PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr, 1457 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1458 PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr, 1459 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1460 PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr, 1461 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1462 1463 #ifdef PNG_READ_bKGD_SUPPORTED 1464 PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr, 1465 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1466 #endif 1467 1468 #ifdef PNG_READ_cHRM_SUPPORTED 1469 PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr, 1470 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1471 #endif 1472 1473 #ifdef PNG_READ_eXIf_SUPPORTED 1474 PNG_INTERNAL_FUNCTION(void,png_handle_eXIf,(png_structrp png_ptr, 1475 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1476 #endif 1477 1478 #ifdef PNG_READ_gAMA_SUPPORTED 1479 PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr, 1480 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1481 #endif 1482 1483 #ifdef PNG_READ_hIST_SUPPORTED 1484 PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr, 1485 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1486 #endif 1487 1488 #ifdef PNG_READ_iCCP_SUPPORTED 1489 PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr, 1490 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1491 #endif /* READ_iCCP */ 1492 1493 #ifdef PNG_READ_iTXt_SUPPORTED 1494 PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr, 1495 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1496 #endif 1497 1498 #ifdef PNG_READ_oFFs_SUPPORTED 1499 PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr, 1500 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1501 #endif 1502 1503 #ifdef PNG_READ_pCAL_SUPPORTED 1504 PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr, 1505 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1506 #endif 1507 1508 #ifdef PNG_READ_pHYs_SUPPORTED 1509 PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr, 1510 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1511 #endif 1512 1513 #ifdef PNG_READ_sBIT_SUPPORTED 1514 PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr, 1515 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1516 #endif 1517 1518 #ifdef PNG_READ_sCAL_SUPPORTED 1519 PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr, 1520 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1521 #endif 1522 1523 #ifdef PNG_READ_sPLT_SUPPORTED 1524 PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr, 1525 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1526 #endif /* READ_sPLT */ 1527 1528 #ifdef PNG_READ_sRGB_SUPPORTED 1529 PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr, 1530 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1531 #endif 1532 1533 #ifdef PNG_READ_tEXt_SUPPORTED 1534 PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr, 1535 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1536 #endif 1537 1538 #ifdef PNG_READ_tIME_SUPPORTED 1539 PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr, 1540 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1541 #endif 1542 1543 #ifdef PNG_READ_tRNS_SUPPORTED 1544 PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr, 1545 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1546 #endif 1547 1548 #ifdef PNG_READ_zTXt_SUPPORTED 1549 PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr, 1550 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1551 #endif 1552 1553 PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_const_structrp png_ptr, 1554 png_uint_32 chunk_name),PNG_EMPTY); 1555 1556 PNG_INTERNAL_FUNCTION(void,png_check_chunk_length,(png_const_structrp png_ptr, 1557 png_uint_32 chunk_length),PNG_EMPTY); 1558 1559 PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr, 1560 png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY); 1561 /* This is the function that gets called for unknown chunks. The 'keep' 1562 * argument is either non-zero for a known chunk that has been set to be 1563 * handled as unknown or zero for an unknown chunk. By default the function 1564 * just skips the chunk or errors out if it is critical. 1565 */ 1566 1567 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\ 1568 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 1569 PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling, 1570 (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY); 1571 /* Exactly as the API png_handle_as_unknown() except that the argument is a 1572 * 32-bit chunk name, not a string. 1573 */ 1574 #endif /* READ_UNKNOWN_CHUNKS || HANDLE_AS_UNKNOWN */ 1575 1576 /* Handle the transformations for reading and writing */ 1577 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1578 PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr, 1579 png_row_infop row_info),PNG_EMPTY); 1580 #endif 1581 #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED 1582 PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr, 1583 png_row_infop row_info),PNG_EMPTY); 1584 #endif 1585 1586 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1587 PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr), 1588 PNG_EMPTY); 1589 #endif 1590 1591 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1592 PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr, 1593 png_inforp info_ptr),PNG_EMPTY); 1594 PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr, 1595 png_inforp info_ptr),PNG_EMPTY); 1596 PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY); 1597 PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr), 1598 PNG_EMPTY); 1599 PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr, 1600 png_bytep buffer, size_t buffer_length),PNG_EMPTY); 1601 PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY); 1602 PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr, 1603 png_bytep buffer, size_t buffer_length),PNG_EMPTY); 1604 PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr), 1605 PNG_EMPTY); 1606 PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr, 1607 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1608 PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr, 1609 png_inforp info_ptr),PNG_EMPTY); 1610 PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr, 1611 png_inforp info_ptr),PNG_EMPTY); 1612 PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr, 1613 png_bytep row),PNG_EMPTY); 1614 PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr, 1615 png_inforp info_ptr),PNG_EMPTY); 1616 PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr, 1617 png_inforp info_ptr),PNG_EMPTY); 1618 PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr), 1619 PNG_EMPTY); 1620 # ifdef PNG_READ_tEXt_SUPPORTED 1621 PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr, 1622 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1623 PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr, 1624 png_inforp info_ptr),PNG_EMPTY); 1625 # endif 1626 # ifdef PNG_READ_zTXt_SUPPORTED 1627 PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr, 1628 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1629 PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr, 1630 png_inforp info_ptr),PNG_EMPTY); 1631 # endif 1632 # ifdef PNG_READ_iTXt_SUPPORTED 1633 PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr, 1634 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1635 PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr, 1636 png_inforp info_ptr),PNG_EMPTY); 1637 # endif 1638 1639 #endif /* PROGRESSIVE_READ */ 1640 1641 #ifdef PNG_APNG_SUPPORTED 1642 PNG_INTERNAL_FUNCTION(void,png_ensure_fcTL_is_valid,(png_structp png_ptr, 1643 png_uint_32 width, png_uint_32 height, 1644 png_uint_32 x_offset, png_uint_32 y_offset, 1645 png_uint_16 delay_num, png_uint_16 delay_den, 1646 png_byte dispose_op, png_byte blend_op),PNG_EMPTY); 1647 1648 #ifdef PNG_READ_APNG_SUPPORTED 1649 PNG_INTERNAL_FUNCTION(void,png_handle_acTL,(png_structp png_ptr, 1650 png_infop info_ptr, png_uint_32 length),PNG_EMPTY); 1651 PNG_INTERNAL_FUNCTION(void,png_handle_fcTL,(png_structp png_ptr, 1652 png_infop info_ptr, png_uint_32 length),PNG_EMPTY); 1653 PNG_INTERNAL_FUNCTION(void,png_handle_fdAT,(png_structp png_ptr, 1654 png_infop info_ptr, png_uint_32 length),PNG_EMPTY); 1655 PNG_INTERNAL_FUNCTION(void,png_have_info,(png_structp png_ptr, 1656 png_infop info_ptr),PNG_EMPTY); 1657 PNG_INTERNAL_FUNCTION(void,png_ensure_sequence_number,(png_structp png_ptr, 1658 png_uint_32 length),PNG_EMPTY); 1659 PNG_INTERNAL_FUNCTION(void,png_read_reset,(png_structp png_ptr),PNG_EMPTY); 1660 PNG_INTERNAL_FUNCTION(void,png_read_reinit,(png_structp png_ptr, 1661 png_infop info_ptr),PNG_EMPTY); 1662 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1663 PNG_INTERNAL_FUNCTION(void,png_progressive_read_reset,(png_structp png_ptr), 1664 PNG_EMPTY); 1665 #endif /* PROGRESSIVE_READ */ 1666 #endif /* READ_APNG */ 1667 1668 #ifdef PNG_WRITE_APNG_SUPPORTED 1669 PNG_INTERNAL_FUNCTION(void,png_write_acTL,(png_structp png_ptr, 1670 png_uint_32 num_frames, png_uint_32 num_plays),PNG_EMPTY); 1671 PNG_INTERNAL_FUNCTION(void,png_write_fcTL,(png_structp png_ptr, 1672 png_uint_32 width, png_uint_32 height, 1673 png_uint_32 x_offset, png_uint_32 y_offset, 1674 png_uint_16 delay_num, png_uint_16 delay_den, 1675 png_byte dispose_op, png_byte blend_op),PNG_EMPTY); 1676 PNG_INTERNAL_FUNCTION(void,png_write_fdAT,(png_structp png_ptr, 1677 png_const_bytep data, png_size_t length),PNG_EMPTY); 1678 PNG_INTERNAL_FUNCTION(void,png_write_reset,(png_structp png_ptr),PNG_EMPTY); 1679 PNG_INTERNAL_FUNCTION(void,png_write_reinit,(png_structp png_ptr, 1680 png_infop info_ptr, png_uint_32 width, png_uint_32 height),PNG_EMPTY); 1681 #endif /* WRITE_APNG */ 1682 #endif /* APNG */ 1683 1684 /* Added at libpng version 1.6.0 */ 1685 #ifdef PNG_GAMMA_SUPPORTED 1686 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr, 1687 png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY); 1688 /* Set the colorspace gamma with a value provided by the application or by 1689 * the gAMA chunk on read. The value will override anything set by an ICC 1690 * profile. 1691 */ 1692 1693 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr, 1694 png_inforp info_ptr), PNG_EMPTY); 1695 /* Synchronize the info 'valid' flags with the colorspace */ 1696 1697 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr, 1698 png_inforp info_ptr), PNG_EMPTY); 1699 /* Copy the png_struct colorspace to the info_struct and call the above to 1700 * synchronize the flags. Checks for NULL info_ptr and does nothing. 1701 */ 1702 #endif 1703 1704 /* Added at libpng version 1.4.0 */ 1705 #ifdef PNG_COLORSPACE_SUPPORTED 1706 /* These internal functions are for maintaining the colorspace structure within 1707 * a png_info or png_struct (or, indeed, both). 1708 */ 1709 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities, 1710 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy, 1711 int preferred), PNG_EMPTY); 1712 1713 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints, 1714 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ, 1715 int preferred), PNG_EMPTY); 1716 1717 #ifdef PNG_sRGB_SUPPORTED 1718 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr, 1719 png_colorspacerp colorspace, int intent), PNG_EMPTY); 1720 /* This does set the colorspace gAMA and cHRM values too, but doesn't set the 1721 * flags to write them, if it returns false there was a problem and an error 1722 * message has already been output (but the colorspace may still need to be 1723 * synced to record the invalid flag). 1724 */ 1725 #endif /* sRGB */ 1726 1727 #ifdef PNG_iCCP_SUPPORTED 1728 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr, 1729 png_colorspacerp colorspace, png_const_charp name, 1730 png_uint_32 profile_length, png_const_bytep profile, int color_type), 1731 PNG_EMPTY); 1732 /* The 'name' is used for information only */ 1733 1734 /* Routines for checking parts of an ICC profile. */ 1735 #ifdef PNG_READ_iCCP_SUPPORTED 1736 PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr, 1737 png_colorspacerp colorspace, png_const_charp name, 1738 png_uint_32 profile_length), PNG_EMPTY); 1739 #endif /* READ_iCCP */ 1740 PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr, 1741 png_colorspacerp colorspace, png_const_charp name, 1742 png_uint_32 profile_length, 1743 png_const_bytep profile /* first 132 bytes only */, int color_type), 1744 PNG_EMPTY); 1745 PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr, 1746 png_colorspacerp colorspace, png_const_charp name, 1747 png_uint_32 profile_length, 1748 png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY); 1749 #ifdef PNG_sRGB_SUPPORTED 1750 PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,( 1751 png_const_structrp png_ptr, png_colorspacerp colorspace, 1752 png_const_bytep profile, uLong adler), PNG_EMPTY); 1753 /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may 1754 * be zero to indicate that it is not available. It is used, if provided, 1755 * as a fast check on the profile when checking to see if it is sRGB. 1756 */ 1757 #endif 1758 #endif /* iCCP */ 1759 1760 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1761 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients, 1762 (png_structrp png_ptr), PNG_EMPTY); 1763 /* Set the rgb_to_gray coefficients from the colorspace Y values */ 1764 #endif /* READ_RGB_TO_GRAY */ 1765 #endif /* COLORSPACE */ 1766 1767 /* Added at libpng version 1.4.0 */ 1768 PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr, 1769 png_uint_32 width, png_uint_32 height, int bit_depth, 1770 int color_type, int interlace_type, int compression_type, 1771 int filter_type),PNG_EMPTY); 1772 1773 /* Added at libpng version 1.5.10 */ 1774 #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \ 1775 defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED) 1776 PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes, 1777 (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY); 1778 #endif 1779 1780 #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) 1781 PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr, 1782 png_const_charp name),PNG_NORETURN); 1783 #endif 1784 1785 /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite 1786 * the end. Always leaves the buffer nul terminated. Never errors out (and 1787 * there is no error code.) 1788 */ 1789 PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize, 1790 size_t pos, png_const_charp string),PNG_EMPTY); 1791 1792 /* Various internal functions to handle formatted warning messages, currently 1793 * only implemented for warnings. 1794 */ 1795 #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) 1796 /* Utility to dump an unsigned value into a buffer, given a start pointer and 1797 * and end pointer (which should point just *beyond* the end of the buffer!) 1798 * Returns the pointer to the start of the formatted string. This utility only 1799 * does unsigned values. 1800 */ 1801 PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start, 1802 png_charp end, int format, png_alloc_size_t number),PNG_EMPTY); 1803 1804 /* Convenience macro that takes an array: */ 1805 #define PNG_FORMAT_NUMBER(buffer,format,number) \ 1806 png_format_number(buffer, buffer + (sizeof buffer), format, number) 1807 1808 /* Suggested size for a number buffer (enough for 64 bits and a sign!) */ 1809 #define PNG_NUMBER_BUFFER_SIZE 24 1810 1811 /* These are the integer formats currently supported, the name is formed from 1812 * the standard printf(3) format string. 1813 */ 1814 #define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */ 1815 #define PNG_NUMBER_FORMAT_02u 2 1816 #define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */ 1817 #define PNG_NUMBER_FORMAT_02d 2 1818 #define PNG_NUMBER_FORMAT_x 3 1819 #define PNG_NUMBER_FORMAT_02x 4 1820 #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */ 1821 #endif 1822 1823 #ifdef PNG_WARNINGS_SUPPORTED 1824 /* New defines and members adding in libpng-1.5.4 */ 1825 # define PNG_WARNING_PARAMETER_SIZE 32 1826 # define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */ 1827 1828 /* An l-value of this type has to be passed to the APIs below to cache the 1829 * values of the parameters to a formatted warning message. 1830 */ 1831 typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][ 1832 PNG_WARNING_PARAMETER_SIZE]; 1833 1834 PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p, 1835 int number, png_const_charp string),PNG_EMPTY); 1836 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters, 1837 * including the trailing '\0'. 1838 */ 1839 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned, 1840 (png_warning_parameters p, int number, int format, png_alloc_size_t value), 1841 PNG_EMPTY); 1842 /* Use png_alloc_size_t because it is an unsigned type as big as any we 1843 * need to output. Use the following for a signed value. 1844 */ 1845 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed, 1846 (png_warning_parameters p, int number, int format, png_int_32 value), 1847 PNG_EMPTY); 1848 1849 PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr, 1850 png_warning_parameters p, png_const_charp message),PNG_EMPTY); 1851 /* 'message' follows the X/Open approach of using @1, @2 to insert 1852 * parameters previously supplied using the above functions. Errors in 1853 * specifying the parameters will simply result in garbage substitutions. 1854 */ 1855 #endif 1856 1857 #ifdef PNG_BENIGN_ERRORS_SUPPORTED 1858 /* Application errors (new in 1.6); use these functions (declared below) for 1859 * errors in the parameters or order of API function calls on read. The 1860 * 'warning' should be used for an error that can be handled completely; the 1861 * 'error' for one which can be handled safely but which may lose application 1862 * information or settings. 1863 * 1864 * By default these both result in a png_error call prior to release, while in a 1865 * released version the 'warning' is just a warning. However if the application 1866 * explicitly disables benign errors (explicitly permitting the code to lose 1867 * information) they both turn into warnings. 1868 * 1869 * If benign errors aren't supported they end up as the corresponding base call 1870 * (png_warning or png_error.) 1871 */ 1872 PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr, 1873 png_const_charp message),PNG_EMPTY); 1874 /* The application provided invalid parameters to an API function or called 1875 * an API function at the wrong time, libpng can completely recover. 1876 */ 1877 1878 PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr, 1879 png_const_charp message),PNG_EMPTY); 1880 /* As above but libpng will ignore the call, or attempt some other partial 1881 * recovery from the error. 1882 */ 1883 #else 1884 # define png_app_warning(pp,s) png_warning(pp,s) 1885 # define png_app_error(pp,s) png_error(pp,s) 1886 #endif 1887 1888 PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr, 1889 png_const_charp message, int error),PNG_EMPTY); 1890 /* Report a recoverable issue in chunk data. On read this is used to report 1891 * a problem found while reading a particular chunk and the 1892 * png_chunk_benign_error or png_chunk_warning function is used as 1893 * appropriate. On write this is used to report an error that comes from 1894 * data set via an application call to a png_set_ API and png_app_error or 1895 * png_app_warning is used as appropriate. 1896 * 1897 * The 'error' parameter must have one of the following values: 1898 */ 1899 #define PNG_CHUNK_WARNING 0 /* never an error */ 1900 #define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */ 1901 #define PNG_CHUNK_ERROR 2 /* always an error */ 1902 1903 /* ASCII to FP interfaces, currently only implemented if sCAL 1904 * support is required. 1905 */ 1906 #if defined(PNG_sCAL_SUPPORTED) 1907 /* MAX_DIGITS is actually the maximum number of characters in an sCAL 1908 * width or height, derived from the precision (number of significant 1909 * digits - a build time settable option) and assumptions about the 1910 * maximum ridiculous exponent. 1911 */ 1912 #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/) 1913 1914 #ifdef PNG_FLOATING_POINT_SUPPORTED 1915 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr, 1916 png_charp ascii, size_t size, double fp, unsigned int precision), 1917 PNG_EMPTY); 1918 #endif /* FLOATING_POINT */ 1919 1920 #ifdef PNG_FIXED_POINT_SUPPORTED 1921 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr, 1922 png_charp ascii, size_t size, png_fixed_point fp),PNG_EMPTY); 1923 #endif /* FIXED_POINT */ 1924 #endif /* sCAL */ 1925 1926 #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) 1927 /* An internal API to validate the format of a floating point number. 1928 * The result is the index of the next character. If the number is 1929 * not valid it will be the index of a character in the supposed number. 1930 * 1931 * The format of a number is defined in the PNG extensions specification 1932 * and this API is strictly conformant to that spec, not anyone elses! 1933 * 1934 * The format as a regular expression is: 1935 * 1936 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)? 1937 * 1938 * or: 1939 * 1940 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)? 1941 * 1942 * The complexity is that either integer or fraction must be present and the 1943 * fraction is permitted to have no digits only if the integer is present. 1944 * 1945 * NOTE: The dangling E problem. 1946 * There is a PNG valid floating point number in the following: 1947 * 1948 * PNG floating point numbers are not greedy. 1949 * 1950 * Working this out requires *TWO* character lookahead (because of the 1951 * sign), the parser does not do this - it will fail at the 'r' - this 1952 * doesn't matter for PNG sCAL chunk values, but it requires more care 1953 * if the value were ever to be embedded in something more complex. Use 1954 * ANSI-C strtod if you need the lookahead. 1955 */ 1956 /* State table for the parser. */ 1957 #define PNG_FP_INTEGER 0 /* before or in integer */ 1958 #define PNG_FP_FRACTION 1 /* before or in fraction */ 1959 #define PNG_FP_EXPONENT 2 /* before or in exponent */ 1960 #define PNG_FP_STATE 3 /* mask for the above */ 1961 #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */ 1962 #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */ 1963 #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */ 1964 #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */ 1965 #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */ 1966 1967 /* These three values don't affect the parser. They are set but not used. 1968 */ 1969 #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */ 1970 #define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */ 1971 #define PNG_FP_NONZERO 256 /* A non-zero value */ 1972 #define PNG_FP_STICKY 448 /* The above three flags */ 1973 1974 /* This is available for the caller to store in 'state' if required. Do not 1975 * call the parser after setting it (the parser sometimes clears it.) 1976 */ 1977 #define PNG_FP_INVALID 512 /* Available for callers as a distinct value */ 1978 1979 /* Result codes for the parser (boolean - true meants ok, false means 1980 * not ok yet.) 1981 */ 1982 #define PNG_FP_MAYBE 0 /* The number may be valid in the future */ 1983 #define PNG_FP_OK 1 /* The number is valid */ 1984 1985 /* Tests on the sticky non-zero and negative flags. To pass these checks 1986 * the state must also indicate that the whole number is valid - this is 1987 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this 1988 * is equivalent to PNG_FP_OK above.) 1989 */ 1990 #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO) 1991 /* NZ_MASK: the string is valid and a non-zero negative value */ 1992 #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO) 1993 /* Z MASK: the string is valid and a non-zero value. */ 1994 /* PNG_FP_SAW_DIGIT: the string is valid. */ 1995 #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT) 1996 #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK) 1997 #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK) 1998 1999 /* The actual parser. This can be called repeatedly. It updates 2000 * the index into the string and the state variable (which must 2001 * be initialized to 0). It returns a result code, as above. There 2002 * is no point calling the parser any more if it fails to advance to 2003 * the end of the string - it is stuck on an invalid character (or 2004 * terminated by '\0'). 2005 * 2006 * Note that the pointer will consume an E or even an E+ and then leave 2007 * a 'maybe' state even though a preceding integer.fraction is valid. 2008 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was 2009 * a valid number. It's possible to recover from this by calling 2010 * the parser again (from the start, with state 0) but with a string 2011 * that omits the last character (i.e. set the size to the index of 2012 * the problem character.) This has not been tested within libpng. 2013 */ 2014 PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string, 2015 size_t size, int *statep, png_size_tp whereami),PNG_EMPTY); 2016 2017 /* This is the same but it checks a complete string and returns true 2018 * only if it just contains a floating point number. As of 1.5.4 this 2019 * function also returns the state at the end of parsing the number if 2020 * it was valid (otherwise it returns 0.) This can be used for testing 2021 * for negative or zero values using the sticky flag. 2022 */ 2023 PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string, 2024 size_t size),PNG_EMPTY); 2025 #endif /* pCAL || sCAL */ 2026 2027 #if defined(PNG_GAMMA_SUPPORTED) ||\ 2028 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED) 2029 /* Added at libpng version 1.5.0 */ 2030 /* This is a utility to provide a*times/div (rounded) and indicate 2031 * if there is an overflow. The result is a boolean - false (0) 2032 * for overflow, true (1) if no overflow, in which case *res 2033 * holds the result. 2034 */ 2035 PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a, 2036 png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY); 2037 #endif 2038 2039 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED) 2040 /* Same deal, but issue a warning on overflow and return 0. */ 2041 PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn, 2042 (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by, 2043 png_int_32 divided_by),PNG_EMPTY); 2044 #endif 2045 2046 #ifdef PNG_GAMMA_SUPPORTED 2047 /* Calculate a reciprocal - used for gamma values. This returns 2048 * 0 if the argument is 0 in order to maintain an undefined value; 2049 * there are no warnings. 2050 */ 2051 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a), 2052 PNG_EMPTY); 2053 2054 #ifdef PNG_READ_GAMMA_SUPPORTED 2055 /* The same but gives a reciprocal of the product of two fixed point 2056 * values. Accuracy is suitable for gamma calculations but this is 2057 * not exact - use png_muldiv for that. Only required at present on read. 2058 */ 2059 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a, 2060 png_fixed_point b),PNG_EMPTY); 2061 #endif 2062 2063 /* Return true if the gamma value is significantly different from 1.0 */ 2064 PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value), 2065 PNG_EMPTY); 2066 #endif 2067 2068 #ifdef PNG_READ_GAMMA_SUPPORTED 2069 /* Internal fixed point gamma correction. These APIs are called as 2070 * required to convert single values - they don't need to be fast, 2071 * they are not used when processing image pixel values. 2072 * 2073 * While the input is an 'unsigned' value it must actually be the 2074 * correct bit value - 0..255 or 0..65535 as required. 2075 */ 2076 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr, 2077 unsigned int value, png_fixed_point gamma_value),PNG_EMPTY); 2078 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value, 2079 png_fixed_point gamma_value),PNG_EMPTY); 2080 PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value, 2081 png_fixed_point gamma_value),PNG_EMPTY); 2082 PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr), 2083 PNG_EMPTY); 2084 PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr, 2085 int bit_depth),PNG_EMPTY); 2086 #endif 2087 2088 /* SIMPLIFIED READ/WRITE SUPPORT */ 2089 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 2090 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 2091 /* The internal structure that png_image::opaque points to. */ 2092 typedef struct png_control 2093 { 2094 png_structp png_ptr; 2095 png_infop info_ptr; 2096 png_voidp error_buf; /* Always a jmp_buf at present. */ 2097 2098 png_const_bytep memory; /* Memory buffer. */ 2099 size_t size; /* Size of the memory buffer. */ 2100 2101 unsigned int for_write :1; /* Otherwise it is a read structure */ 2102 unsigned int owned_file :1; /* We own the file in io_ptr */ 2103 } png_control; 2104 2105 /* Return the pointer to the jmp_buf from a png_control: necessary because C 2106 * does not reveal the type of the elements of jmp_buf. 2107 */ 2108 #ifdef __cplusplus 2109 # define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0]) 2110 #else 2111 # define png_control_jmp_buf(pc) ((pc)->error_buf) 2112 #endif 2113 2114 /* Utility to safely execute a piece of libpng code catching and logging any 2115 * errors that might occur. Returns true on success, false on failure (either 2116 * of the function or as a result of a png_error.) 2117 */ 2118 PNG_INTERNAL_CALLBACK(void,png_safe_error,(png_structp png_ptr, 2119 png_const_charp error_message),PNG_NORETURN); 2120 2121 #ifdef PNG_WARNINGS_SUPPORTED 2122 PNG_INTERNAL_CALLBACK(void,png_safe_warning,(png_structp png_ptr, 2123 png_const_charp warning_message),PNG_EMPTY); 2124 #else 2125 # define png_safe_warning 0/*dummy argument*/ 2126 #endif 2127 2128 PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image, 2129 int (*function)(png_voidp), png_voidp arg),PNG_EMPTY); 2130 2131 /* Utility to log an error; this also cleans up the png_image; the function 2132 * always returns 0 (false). 2133 */ 2134 PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image, 2135 png_const_charp error_message),PNG_EMPTY); 2136 2137 #ifndef PNG_SIMPLIFIED_READ_SUPPORTED 2138 /* png_image_free is used by the write code but not exported */ 2139 PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY); 2140 #endif /* !SIMPLIFIED_READ */ 2141 2142 #endif /* SIMPLIFIED READ/WRITE */ 2143 2144 /* These are initialization functions for hardware specific PNG filter 2145 * optimizations; list these here then select the appropriate one at compile 2146 * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined 2147 * the generic code is used. 2148 */ 2149 #ifdef PNG_FILTER_OPTIMIZATIONS 2150 PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr, 2151 unsigned int bpp), PNG_EMPTY); 2152 /* Just declare the optimization that will be used */ 2153 #else 2154 /* List *all* the possible optimizations here - this branch is required if 2155 * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in 2156 * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing. 2157 */ 2158 # if PNG_ARM_NEON_OPT > 0 2159 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon, 2160 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2161 #endif 2162 2163 #if PNG_MIPS_MSA_OPT > 0 2164 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_msa, 2165 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2166 #endif 2167 2168 # if PNG_INTEL_SSE_IMPLEMENTATION > 0 2169 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_sse2, 2170 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2171 # endif 2172 #endif 2173 2174 PNG_INTERNAL_FUNCTION(png_uint_32, png_check_keyword, (png_structrp png_ptr, 2175 png_const_charp key, png_bytep new_key), PNG_EMPTY); 2176 2177 #if PNG_ARM_NEON_IMPLEMENTATION == 1 2178 PNG_INTERNAL_FUNCTION(void, 2179 png_riffle_palette_neon, 2180 (png_structrp), 2181 PNG_EMPTY); 2182 PNG_INTERNAL_FUNCTION(int, 2183 png_do_expand_palette_rgba8_neon, 2184 (png_structrp, 2185 png_row_infop, 2186 png_const_bytep, 2187 const png_bytepp, 2188 const png_bytepp), 2189 PNG_EMPTY); 2190 PNG_INTERNAL_FUNCTION(int, 2191 png_do_expand_palette_rgb8_neon, 2192 (png_structrp, 2193 png_row_infop, 2194 png_const_bytep, 2195 const png_bytepp, 2196 const png_bytepp), 2197 PNG_EMPTY); 2198 #endif 2199 2200 /* Maintainer: Put new private prototypes here ^ */ 2201 2202 #include "pngdebug.h" 2203 2204 #ifdef __cplusplus 2205 } 2206 #endif 2207 2208 #endif /* PNG_VERSION_INFO_ONLY */ 2209 #endif /* PNGPRIV_H */ 2210