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 #ifdef _MSC_VER 27 # ifndef _CRT_SECURE_NO_DEPRECATE 28 # define _CRT_SECURE_NO_DEPRECATE 29 # endif 30 #endif 31 32 /* Feature Test Macros. The following are defined here to ensure that correctly 33 * implemented libraries reveal the APIs libpng needs to build and hide those 34 * that are not needed and potentially damaging to the compilation. 35 * 36 * Feature Test Macros must be defined before any system header is included (see 37 * POSIX 1003.1 2.8.2 "POSIX Symbols." 38 * 39 * These macros only have an effect if the operating system supports either 40 * POSIX 1003.1 or C99, or both. On other operating systems (particularly 41 * Windows/Visual Studio) there is no effect; the OS specific tests below are 42 * still required (as of 2011-05-02.) 43 */ 44 #ifndef _POSIX_SOURCE 45 # define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */ 46 #endif 47 48 #ifndef PNG_VERSION_INFO_ONLY 49 /* Standard library headers not required by png.h: */ 50 # include <stdlib.h> 51 # include <string.h> 52 #endif 53 54 #define PNGLIB_BUILD /*libpng is being built, not used*/ 55 56 /* If HAVE_CONFIG_H is defined during the build then the build system must 57 * provide an appropriate "config.h" file on the include path. The header file 58 * must provide definitions as required below (search for "HAVE_CONFIG_H"); 59 * see configure.ac for more details of the requirements. The macro 60 * "PNG_NO_CONFIG_H" is provided for maintainers to test for dependencies on 61 * 'configure'; define this macro to prevent the configure build including the 62 * configure generated config.h. Libpng is expected to compile without *any* 63 * special build system support on a reasonably ANSI-C compliant system. 64 */ 65 #if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H) 66 # include <config.h> 67 68 /* Pick up the definition of 'restrict' from config.h if it was read: */ 69 # define PNG_RESTRICT restrict 70 #endif 71 72 /* To support symbol prefixing it is necessary to know *before* including png.h 73 * whether the fixed point (and maybe other) APIs are exported, because if they 74 * are not internal definitions may be required. This is handled below just 75 * before png.h is included, but load the configuration now if it is available. 76 */ 77 #ifndef PNGLCONF_H 78 # include "pnglibconf.h" 79 #endif 80 81 /* Local renames may change non-exported API functions from png.h */ 82 #if defined(PNG_PREFIX) && !defined(PNGPREFIX_H) 83 # include "pngprefix.h" 84 #endif 85 86 #ifdef PNG_USER_CONFIG 87 # include "pngusr.h" 88 /* These should have been defined in pngusr.h */ 89 # ifndef PNG_USER_PRIVATEBUILD 90 # define PNG_USER_PRIVATEBUILD "Custom libpng build" 91 # endif 92 # ifndef PNG_USER_DLLFNAME_POSTFIX 93 # define PNG_USER_DLLFNAME_POSTFIX "Cb" 94 # endif 95 #endif 96 97 /* Compile time options. 98 * ===================== 99 * In a multi-arch build the compiler may compile the code several times for the 100 * same object module, producing different binaries for different architectures. 101 * When this happens configure-time setting of the target host options cannot be 102 * done and this interferes with the handling of the ARM NEON optimizations, and 103 * possibly other similar optimizations. Put additional tests here; in general 104 * this is needed when the same option can be changed at both compile time and 105 * run time depending on the target OS (i.e. iOS vs Android.) 106 * 107 * NOTE: symbol prefixing does not pass $(CFLAGS) to the preprocessor, because 108 * this is not possible with certain compilers (Oracle SUN OS CC), as a result 109 * it is necessary to ensure that all extern functions that *might* be used 110 * regardless of $(CFLAGS) get declared in this file. The test on __ARM_NEON__ 111 * below is one example of this behavior because it is controlled by the 112 * presence or not of -mfpu=neon on the GCC command line, it is possible to do 113 * this in $(CC), e.g. "CC=gcc -mfpu=neon", but people who build libpng rarely 114 * do this. 115 */ 116 #ifndef PNG_ARM_NEON_OPT 117 /* ARM NEON optimizations are being controlled by the compiler settings, 118 * typically the target FPU. If the FPU has been set to NEON (-mfpu=neon 119 * with GCC) then the compiler will define __ARM_NEON__ and we can rely 120 * unconditionally on NEON instructions not crashing, otherwise we must 121 * disable use of NEON instructions. 122 * 123 * NOTE: at present these optimizations depend on 'ALIGNED_MEMORY', so they 124 * can only be turned on automatically if that is supported too. If 125 * PNG_ARM_NEON_OPT is set in CPPFLAGS (to >0) then arm/arm_init.c will fail 126 * to compile with an appropriate #error if ALIGNED_MEMORY has been turned 127 * off. 128 * 129 * Note that gcc-4.9 defines __ARM_NEON instead of the deprecated 130 * __ARM_NEON__, so we check both variants. 131 * 132 * To disable ARM_NEON optimizations entirely, and skip compiling the 133 * associated assembler code, pass --enable-arm-neon=no to configure 134 * or put -DPNG_ARM_NEON_OPT=0 in CPPFLAGS. 135 */ 136 # if (defined(__ARM_NEON__) || defined(__ARM_NEON)) && \ 137 defined(PNG_ALIGNED_MEMORY_SUPPORTED) 138 # define PNG_ARM_NEON_OPT 2 139 # else 140 # define PNG_ARM_NEON_OPT 0 141 # endif 142 #endif 143 144 #if PNG_ARM_NEON_OPT > 0 145 /* NEON optimizations are to be at least considered by libpng, so enable the 146 * callbacks to do this. 147 */ 148 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_neon 149 150 /* By default the 'intrinsics' code in arm/filter_neon_intrinsics.c is used 151 * if possible - if __ARM_NEON__ is set and the compiler version is not known 152 * to be broken. This is controlled by PNG_ARM_NEON_IMPLEMENTATION which can 153 * be: 154 * 155 * 1 The intrinsics code (the default with __ARM_NEON__) 156 * 2 The hand coded assembler (the default without __ARM_NEON__) 157 * 158 * It is possible to set PNG_ARM_NEON_IMPLEMENTATION in CPPFLAGS, however 159 * this is *NOT* supported and may cease to work even after a minor revision 160 * to libpng. It *is* valid to do this for testing purposes, e.g. speed 161 * testing or a new compiler, but the results should be communicated to the 162 * libpng implementation list for incorporation in the next minor release. 163 */ 164 # ifndef PNG_ARM_NEON_IMPLEMENTATION 165 # if defined(__ARM_NEON__) || defined(__ARM_NEON) 166 # if defined(__clang__) 167 /* At present it is unknown by the libpng developers which versions 168 * of clang support the intrinsics, however some or perhaps all 169 * versions do not work with the assembler so this may be 170 * irrelevant, so just use the default (do nothing here.) 171 */ 172 # elif defined(__GNUC__) 173 /* GCC 4.5.4 NEON support is known to be broken. 4.6.3 is known to 174 * work, so if this *is* GCC, or G++, look for a version >4.5 175 */ 176 # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6) 177 # define PNG_ARM_NEON_IMPLEMENTATION 2 178 # endif /* no GNUC support */ 179 # endif /* __GNUC__ */ 180 # else /* !defined __ARM_NEON__ */ 181 /* The 'intrinsics' code simply won't compile without this -mfpu=neon: 182 */ 183 # if !defined(__aarch64__) 184 /* The assembler code currently does not work on ARM64 */ 185 # define PNG_ARM_NEON_IMPLEMENTATION 2 186 # endif /* __aarch64__ */ 187 # endif /* __ARM_NEON__ */ 188 # endif /* !PNG_ARM_NEON_IMPLEMENTATION */ 189 190 # ifndef PNG_ARM_NEON_IMPLEMENTATION 191 /* Use the intrinsics code by default. */ 192 # define PNG_ARM_NEON_IMPLEMENTATION 1 193 # endif 194 #endif /* PNG_ARM_NEON_OPT > 0 */ 195 196 #ifndef PNG_MIPS_MSA_OPT 197 # if defined(__mips_msa) && (__mips_isa_rev >= 5) && defined(PNG_ALIGNED_MEMORY_SUPPORTED) 198 # define PNG_MIPS_MSA_OPT 2 199 # else 200 # define PNG_MIPS_MSA_OPT 0 201 # endif 202 #endif 203 204 #ifndef PNG_POWERPC_VSX_OPT 205 # if defined(__PPC64__) && defined(__ALTIVEC__) && defined(__VSX__) 206 # define PNG_POWERPC_VSX_OPT 2 207 # else 208 # define PNG_POWERPC_VSX_OPT 0 209 # endif 210 #endif 211 212 #ifndef PNG_INTEL_SSE_OPT 213 # ifdef PNG_INTEL_SSE 214 /* Only check for SSE if the build configuration has been modified to 215 * enable SSE optimizations. This means that these optimizations will 216 * be off by default. See contrib/intel for more details. 217 */ 218 # if defined(__SSE4_1__) || defined(__AVX__) || defined(__SSSE3__) || \ 219 defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \ 220 (defined(_M_IX86_FP) && _M_IX86_FP >= 2) 221 # define PNG_INTEL_SSE_OPT 1 222 # else 223 # define PNG_INTEL_SSE_OPT 0 224 # endif 225 # else 226 # define PNG_INTEL_SSE_OPT 0 227 # endif 228 #endif 229 230 #if PNG_INTEL_SSE_OPT > 0 231 # ifndef PNG_INTEL_SSE_IMPLEMENTATION 232 # if defined(__SSE4_1__) || defined(__AVX__) 233 /* We are not actually using AVX, but checking for AVX is the best 234 way we can detect SSE4.1 and SSSE3 on MSVC. 235 */ 236 # define PNG_INTEL_SSE_IMPLEMENTATION 3 237 # elif defined(__SSSE3__) 238 # define PNG_INTEL_SSE_IMPLEMENTATION 2 239 # elif defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \ 240 (defined(_M_IX86_FP) && _M_IX86_FP >= 2) 241 # define PNG_INTEL_SSE_IMPLEMENTATION 1 242 # else 243 # define PNG_INTEL_SSE_IMPLEMENTATION 0 244 # endif 245 # endif 246 247 # if PNG_INTEL_SSE_IMPLEMENTATION > 0 248 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_sse2 249 # endif 250 #else 251 # define PNG_INTEL_SSE_IMPLEMENTATION 0 252 #endif 253 254 #if PNG_MIPS_MSA_OPT > 0 255 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_msa 256 # ifndef PNG_MIPS_MSA_IMPLEMENTATION 257 # if defined(__mips_msa) 258 # if defined(__clang__) 259 # elif defined(__GNUC__) 260 # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7) 261 # define PNG_MIPS_MSA_IMPLEMENTATION 2 262 # endif /* no GNUC support */ 263 # endif /* __GNUC__ */ 264 # else /* !defined __mips_msa */ 265 # define PNG_MIPS_MSA_IMPLEMENTATION 2 266 # endif /* __mips_msa */ 267 # endif /* !PNG_MIPS_MSA_IMPLEMENTATION */ 268 269 # ifndef PNG_MIPS_MSA_IMPLEMENTATION 270 # define PNG_MIPS_MSA_IMPLEMENTATION 1 271 # endif 272 #endif /* PNG_MIPS_MSA_OPT > 0 */ 273 274 #if PNG_POWERPC_VSX_OPT > 0 275 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_vsx 276 # define PNG_POWERPC_VSX_IMPLEMENTATION 1 277 #endif 278 279 280 /* Is this a build of a DLL where compilation of the object modules requires 281 * different preprocessor settings to those required for a simple library? If 282 * so PNG_BUILD_DLL must be set. 283 * 284 * If libpng is used inside a DLL but that DLL does not export the libpng APIs 285 * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a 286 * static library of libpng then link the DLL against that. 287 */ 288 #ifndef PNG_BUILD_DLL 289 # ifdef DLL_EXPORT 290 /* This is set by libtool when files are compiled for a DLL; libtool 291 * always compiles twice, even on systems where it isn't necessary. Set 292 * PNG_BUILD_DLL in case it is necessary: 293 */ 294 # define PNG_BUILD_DLL 295 # else 296 # ifdef _WINDLL 297 /* This is set by the Microsoft Visual Studio IDE in projects that 298 * build a DLL. It can't easily be removed from those projects (it 299 * isn't visible in the Visual Studio UI) so it is a fairly reliable 300 * indication that PNG_IMPEXP needs to be set to the DLL export 301 * attributes. 302 */ 303 # define PNG_BUILD_DLL 304 # else 305 # ifdef __DLL__ 306 /* This is set by the Borland C system when compiling for a DLL 307 * (as above.) 308 */ 309 # define PNG_BUILD_DLL 310 # else 311 /* Add additional compiler cases here. */ 312 # endif 313 # endif 314 # endif 315 #endif /* Setting PNG_BUILD_DLL if required */ 316 317 /* Modfied for usage in Qt: Do not export the libpng APIs */ 318 #ifdef PNG_BUILD_DLL 319 #undef PNG_BUILD_DLL 320 #endif 321 322 /* See pngconf.h for more details: the builder of the library may set this on 323 * the command line to the right thing for the specific compilation system or it 324 * may be automagically set above (at present we know of no system where it does 325 * need to be set on the command line.) 326 * 327 * PNG_IMPEXP must be set here when building the library to prevent pngconf.h 328 * setting it to the "import" setting for a DLL build. 329 */ 330 #ifndef PNG_IMPEXP 331 # ifdef PNG_BUILD_DLL 332 # define PNG_IMPEXP PNG_DLL_EXPORT 333 # else 334 /* Not building a DLL, or the DLL doesn't require specific export 335 * definitions. 336 */ 337 # define PNG_IMPEXP 338 # endif 339 #endif 340 341 /* No warnings for private or deprecated functions in the build: */ 342 #ifndef PNG_DEPRECATED 343 # define PNG_DEPRECATED 344 #endif 345 #ifndef PNG_PRIVATE 346 # define PNG_PRIVATE 347 #endif 348 349 /* Symbol preprocessing support. 350 * 351 * To enable listing global, but internal, symbols the following macros should 352 * always be used to declare an extern data or function object in this file. 353 */ 354 #ifndef PNG_INTERNAL_DATA 355 # define PNG_INTERNAL_DATA(type, name, array) PNG_LINKAGE_DATA type name array 356 #endif 357 358 #ifndef PNG_INTERNAL_FUNCTION 359 # define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\ 360 PNG_LINKAGE_FUNCTION PNG_FUNCTION(type, name, args, PNG_EMPTY attributes) 361 #endif 362 363 #ifndef PNG_INTERNAL_CALLBACK 364 # define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\ 365 PNG_LINKAGE_CALLBACK PNG_FUNCTION(type, (PNGCBAPI name), args,\ 366 PNG_EMPTY attributes) 367 #endif 368 369 /* If floating or fixed point APIs are disabled they may still be compiled 370 * internally. To handle this make sure they are declared as the appropriate 371 * internal extern function (otherwise the symbol prefixing stuff won't work and 372 * the functions will be used without definitions.) 373 * 374 * NOTE: although all the API functions are declared here they are not all 375 * actually built! Because the declarations are still made it is necessary to 376 * fake out types that they depend on. 377 */ 378 #ifndef PNG_FP_EXPORT 379 # ifndef PNG_FLOATING_POINT_SUPPORTED 380 # define PNG_FP_EXPORT(ordinal, type, name, args)\ 381 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 382 # ifndef PNG_VERSION_INFO_ONLY 383 typedef struct png_incomplete png_double; 384 typedef png_double* png_doublep; 385 typedef const png_double* png_const_doublep; 386 typedef png_double** png_doublepp; 387 # endif 388 # endif 389 #endif 390 #ifndef PNG_FIXED_EXPORT 391 # ifndef PNG_FIXED_POINT_SUPPORTED 392 # define PNG_FIXED_EXPORT(ordinal, type, name, args)\ 393 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 394 # endif 395 #endif 396 397 #include "png.h" 398 399 /* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */ 400 #ifndef PNG_DLL_EXPORT 401 # define PNG_DLL_EXPORT 402 #endif 403 404 /* This is a global switch to set the compilation for an installed system 405 * (a release build). It can be set for testing debug builds to ensure that 406 * they will compile when the build type is switched to RC or STABLE, the 407 * default is just to use PNG_LIBPNG_BUILD_BASE_TYPE. Set this in CPPFLAGS 408 * with either: 409 * 410 * -DPNG_RELEASE_BUILD Turns on the release compile path 411 * -DPNG_RELEASE_BUILD=0 Turns it off 412 * or in your pngusr.h with 413 * #define PNG_RELEASE_BUILD=1 Turns on the release compile path 414 * #define PNG_RELEASE_BUILD=0 Turns it off 415 */ 416 #ifndef PNG_RELEASE_BUILD 417 # define PNG_RELEASE_BUILD (PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC) 418 #endif 419 420 /* SECURITY and SAFETY: 421 * 422 * libpng is built with support for internal limits on image dimensions and 423 * memory usage. These are documented in scripts/pnglibconf.dfa of the 424 * source and recorded in the machine generated header file pnglibconf.h. 425 */ 426 427 /* If you are running on a machine where you cannot allocate more 428 * than 64K of memory at once, uncomment this. While libpng will not 429 * normally need that much memory in a chunk (unless you load up a very 430 * large file), zlib needs to know how big of a chunk it can use, and 431 * libpng thus makes sure to check any memory allocation to verify it 432 * will fit into memory. 433 * 434 * zlib provides 'MAXSEG_64K' which, if defined, indicates the 435 * same limit and pngconf.h (already included) sets the limit 436 * if certain operating systems are detected. 437 */ 438 #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K) 439 # define PNG_MAX_MALLOC_64K 440 #endif 441 442 #ifndef PNG_UNUSED 443 /* Unused formal parameter warnings are silenced using the following macro 444 * which is expected to have no bad effects on performance (optimizing 445 * compilers will probably remove it entirely). Note that if you replace 446 * it with something other than whitespace, you must include the terminating 447 * semicolon. 448 */ 449 # define PNG_UNUSED(param) (void)param; 450 #endif 451 452 /* Just a little check that someone hasn't tried to define something 453 * contradictory. 454 */ 455 #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K) 456 # undef PNG_ZBUF_SIZE 457 # define PNG_ZBUF_SIZE 65536L 458 #endif 459 460 /* If warnings or errors are turned off the code is disabled or redirected here. 461 * From 1.5.4 functions have been added to allow very limited formatting of 462 * error and warning messages - this code will also be disabled here. 463 */ 464 #ifdef PNG_WARNINGS_SUPPORTED 465 # define PNG_WARNING_PARAMETERS(p) png_warning_parameters p; 466 #else 467 # define png_warning_parameter(p,number,string) ((void)0) 468 # define png_warning_parameter_unsigned(p,number,format,value) ((void)0) 469 # define png_warning_parameter_signed(p,number,format,value) ((void)0) 470 # define png_formatted_warning(pp,p,message) ((void)(pp)) 471 # define PNG_WARNING_PARAMETERS(p) 472 #endif 473 #ifndef PNG_ERROR_TEXT_SUPPORTED 474 # define png_fixed_error(s1,s2) png_err(s1) 475 #endif 476 477 /* Some fixed point APIs are still required even if not exported because 478 * they get used by the corresponding floating point APIs. This magic 479 * deals with this: 480 */ 481 #ifdef PNG_FIXED_POINT_SUPPORTED 482 # define PNGFAPI PNGAPI 483 #else 484 # define PNGFAPI /* PRIVATE */ 485 #endif 486 487 #ifndef PNG_VERSION_INFO_ONLY 488 /* Other defines specific to compilers can go here. Try to keep 489 * them inside an appropriate ifdef/endif pair for portability. 490 */ 491 492 /* C allows up-casts from (void*) to any pointer and (const void*) to any 493 * pointer to a const object. C++ regards this as a type error and requires an 494 * explicit, static, cast and provides the static_cast<> rune to ensure that 495 * const is not cast away. 496 */ 497 #ifdef __cplusplus 498 # define png_voidcast(type, value) static_cast<type>(value) 499 # define png_constcast(type, value) const_cast<type>(value) 500 # define png_aligncast(type, value) \ 501 static_cast<type>(static_cast<void*>(value)) 502 # define png_aligncastconst(type, value) \ 503 static_cast<type>(static_cast<const void*>(value)) 504 #else 505 # define png_voidcast(type, value) (value) 506 # ifdef _WIN64 507 # ifdef __GNUC__ 508 typedef unsigned long long png_ptruint; 509 # else 510 typedef unsigned __int64 png_ptruint; 511 # endif 512 # else 513 typedef unsigned long png_ptruint; 514 # endif 515 # define png_constcast(type, value) ((type)(png_ptruint)(const void*)(value)) 516 # define png_aligncast(type, value) ((void*)(value)) 517 # define png_aligncastconst(type, value) ((const void*)(value)) 518 #endif /* __cplusplus */ 519 520 #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\ 521 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) 522 /* png.c requires the following ANSI-C constants if the conversion of 523 * floating point to ASCII is implemented therein: 524 * 525 * DBL_DIG Maximum number of decimal digits (can be set to any constant) 526 * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value) 527 * DBL_MAX Maximum floating point number (can be set to an arbitrary value) 528 */ 529 # include <float.h> 530 531 # if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \ 532 defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC) 533 /* We need to check that <math.h> hasn't already been included earlier 534 * as it seems it doesn't agree with <fp.h>, yet we should really use 535 * <fp.h> if possible. 536 */ 537 # if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__) 538 # include <fp.h> 539 # endif 540 # else 541 # include <math.h> 542 # endif 543 # if defined(_AMIGA) && defined(__SASC) && defined(_M68881) 544 /* Amiga SAS/C: We must include builtin FPU functions when compiling using 545 * MATH=68881 546 */ 547 # include <m68881.h> 548 # endif 549 #endif 550 551 /* This provides the non-ANSI (far) memory allocation routines. */ 552 #if defined(__TURBOC__) && defined(__MSDOS__) 553 # include <mem.h> 554 # include <alloc.h> 555 #endif 556 557 #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \ 558 defined(_WIN32) || defined(__WIN32__) 559 # include <windows.h> /* defines _WINDOWS_ macro */ 560 # if defined(WINAPI_FAMILY) && (WINAPI_FAMILY==WINAPI_FAMILY_APP || WINAPI_FAMILY==WINAPI_FAMILY_PHONE_APP) 561 # define _WINRT_ /* Define a macro for Windows Runtime builds */ 562 # endif 563 #endif 564 #endif /* PNG_VERSION_INFO_ONLY */ 565 566 /* Moved here around 1.5.0beta36 from pngconf.h */ 567 /* Users may want to use these so they are not private. Any library 568 * functions that are passed far data must be model-independent. 569 */ 570 571 /* Memory model/platform independent fns */ 572 #ifndef PNG_ABORT 573 # if (defined(_WINDOWS_) || defined(_WIN32_WCE)) && !defined(_WINRT_) 574 # define PNG_ABORT() ExitProcess(0) 575 # else 576 # define PNG_ABORT() abort() 577 # endif 578 #endif 579 580 /* These macros may need to be architecture dependent. */ 581 #define PNG_ALIGN_NONE 0 /* do not use data alignment */ 582 #define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */ 583 #ifdef offsetof 584 # define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */ 585 #else 586 # define PNG_ALIGN_OFFSET -1 /* prevent the use of this */ 587 #endif 588 #define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */ 589 590 #ifndef PNG_ALIGN_TYPE 591 /* Default to using aligned access optimizations and requiring alignment to a 592 * multiple of the data type size. Override in a compiler specific fashion 593 * if necessary by inserting tests here: 594 */ 595 # define PNG_ALIGN_TYPE PNG_ALIGN_SIZE 596 #endif 597 598 #if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE 599 /* This is used because in some compiler implementations non-aligned 600 * structure members are supported, so the offsetof approach below fails. 601 * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access 602 * is good for performance. Do not do this unless you have tested the result 603 * and understand it. 604 */ 605 # define png_alignof(type) (sizeof (type)) 606 #else 607 # if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET 608 # define png_alignof(type) offsetof(struct{char c; type t;}, t) 609 # else 610 # if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS 611 # define png_alignof(type) (1) 612 # endif 613 /* Else leave png_alignof undefined to prevent use thereof */ 614 # endif 615 #endif 616 617 /* This implicitly assumes alignment is always to a power of 2. */ 618 #ifdef png_alignof 619 # define png_isaligned(ptr, type)\ 620 (((type)((const char*)ptr-(const char*)0) & \ 621 (type)(png_alignof(type)-1)) == 0) 622 #else 623 # define png_isaligned(ptr, type) 0 624 #endif 625 626 /* End of memory model/platform independent support */ 627 /* End of 1.5.0beta36 move from pngconf.h */ 628 629 /* CONSTANTS and UTILITY MACROS 630 * These are used internally by libpng and not exposed in the API 631 */ 632 633 /* Various modes of operation. Note that after an init, mode is set to 634 * zero automatically when the structure is created. Three of these 635 * are defined in png.h because they need to be visible to applications 636 * that call png_set_unknown_chunk(). 637 */ 638 /* #define PNG_HAVE_IHDR 0x01U (defined in png.h) */ 639 /* #define PNG_HAVE_PLTE 0x02U (defined in png.h) */ 640 #define PNG_HAVE_IDAT 0x04U 641 /* #define PNG_AFTER_IDAT 0x08U (defined in png.h) */ 642 #define PNG_HAVE_IEND 0x10U 643 /* 0x20U (unused) */ 644 /* 0x40U (unused) */ 645 /* 0x80U (unused) */ 646 #define PNG_HAVE_CHUNK_HEADER 0x100U 647 #define PNG_WROTE_tIME 0x200U 648 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400U 649 #define PNG_BACKGROUND_IS_GRAY 0x800U 650 #define PNG_HAVE_PNG_SIGNATURE 0x1000U 651 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000U /* Have another chunk after IDAT */ 652 /* 0x4000U (unused) */ 653 #define PNG_IS_READ_STRUCT 0x8000U /* Else is a write struct */ 654 655 /* Flags for the transformations the PNG library does on the image data */ 656 #define PNG_BGR 0x0001U 657 #define PNG_INTERLACE 0x0002U 658 #define PNG_PACK 0x0004U 659 #define PNG_SHIFT 0x0008U 660 #define PNG_SWAP_BYTES 0x0010U 661 #define PNG_INVERT_MONO 0x0020U 662 #define PNG_QUANTIZE 0x0040U 663 #define PNG_COMPOSE 0x0080U /* Was PNG_BACKGROUND */ 664 #define PNG_BACKGROUND_EXPAND 0x0100U 665 #define PNG_EXPAND_16 0x0200U /* Added to libpng 1.5.2 */ 666 #define PNG_16_TO_8 0x0400U /* Becomes 'chop' in 1.5.4 */ 667 #define PNG_RGBA 0x0800U 668 #define PNG_EXPAND 0x1000U 669 #define PNG_GAMMA 0x2000U 670 #define PNG_GRAY_TO_RGB 0x4000U 671 #define PNG_FILLER 0x8000U 672 #define PNG_PACKSWAP 0x10000U 673 #define PNG_SWAP_ALPHA 0x20000U 674 #define PNG_STRIP_ALPHA 0x40000U 675 #define PNG_INVERT_ALPHA 0x80000U 676 #define PNG_USER_TRANSFORM 0x100000U 677 #define PNG_RGB_TO_GRAY_ERR 0x200000U 678 #define PNG_RGB_TO_GRAY_WARN 0x400000U 679 #define PNG_RGB_TO_GRAY 0x600000U /* two bits, RGB_TO_GRAY_ERR|WARN */ 680 #define PNG_ENCODE_ALPHA 0x800000U /* Added to libpng-1.5.4 */ 681 #define PNG_ADD_ALPHA 0x1000000U /* Added to libpng-1.2.7 */ 682 #define PNG_EXPAND_tRNS 0x2000000U /* Added to libpng-1.2.9 */ 683 #define PNG_SCALE_16_TO_8 0x4000000U /* Added to libpng-1.5.4 */ 684 /* 0x8000000U unused */ 685 /* 0x10000000U unused */ 686 /* 0x20000000U unused */ 687 /* 0x40000000U unused */ 688 /* Flags for png_create_struct */ 689 #define PNG_STRUCT_PNG 0x0001U 690 #define PNG_STRUCT_INFO 0x0002U 691 692 /* Flags for the png_ptr->flags rather than declaring a byte for each one */ 693 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001U 694 #define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002U /* Added to libpng-1.6.0 */ 695 /* 0x0004U unused */ 696 #define PNG_FLAG_ZSTREAM_ENDED 0x0008U /* Added to libpng-1.6.0 */ 697 /* 0x0010U unused */ 698 /* 0x0020U unused */ 699 #define PNG_FLAG_ROW_INIT 0x0040U 700 #define PNG_FLAG_FILLER_AFTER 0x0080U 701 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100U 702 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200U 703 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400U 704 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800U 705 #define PNG_FLAG_ASSUME_sRGB 0x1000U /* Added to libpng-1.5.4 */ 706 #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000U /* Added to libpng-1.5.4 */ 707 #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000U /* Added to libpng-1.5.4 */ 708 /* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000U */ 709 /* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000U */ 710 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000U 711 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000U 712 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000U 713 #define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000U /* Added to libpng-1.4.0 */ 714 #define PNG_FLAG_APP_WARNINGS_WARN 0x200000U /* Added to libpng-1.6.0 */ 715 #define PNG_FLAG_APP_ERRORS_WARN 0x400000U /* Added to libpng-1.6.0 */ 716 /* 0x800000U unused */ 717 /* 0x1000000U unused */ 718 /* 0x2000000U unused */ 719 /* 0x4000000U unused */ 720 /* 0x8000000U unused */ 721 /* 0x10000000U unused */ 722 /* 0x20000000U unused */ 723 /* 0x40000000U unused */ 724 725 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 726 PNG_FLAG_CRC_ANCILLARY_NOWARN) 727 728 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 729 PNG_FLAG_CRC_CRITICAL_IGNORE) 730 731 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 732 PNG_FLAG_CRC_CRITICAL_MASK) 733 734 /* Save typing and make code easier to understand */ 735 736 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 737 abs((int)((c1).green) - (int)((c2).green)) + \ 738 abs((int)((c1).blue) - (int)((c2).blue))) 739 740 /* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255 741 * by dividing by 257 *with rounding*. This macro is exact for the given range. 742 * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the 743 * macro were established by experiment (modifying the added value). The macro 744 * has a second variant that takes a value already scaled by 255 and divides by 745 * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it 746 * only gives off-by-one errors and only for 0.5% (1 in 200) of the values. 747 */ 748 #define PNG_DIV65535(v24) (((v24) + 32895) >> 16) 749 #define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255) 750 751 /* Added to libpng-1.2.6 JB */ 752 #define PNG_ROWBYTES(pixel_bits, width) \ 753 ((pixel_bits) >= 8 ? \ 754 ((size_t)(width) * (((size_t)(pixel_bits)) >> 3)) : \ 755 (( ((size_t)(width) * ((size_t)(pixel_bits))) + 7) >> 3) ) 756 757 /* This returns the number of trailing bits in the last byte of a row, 0 if the 758 * last byte is completely full of pixels. It is, in principle, (pixel_bits x 759 * width) % 8, but that would overflow for large 'width'. The second macro is 760 * the same except that it returns the number of unused bits in the last byte; 761 * (8-TRAILBITS), but 0 when TRAILBITS is 0. 762 * 763 * NOTE: these macros are intended to be self-evidently correct and never 764 * overflow on the assumption that pixel_bits is in the range 0..255. The 765 * arguments are evaluated only once and they can be signed (e.g. as a result of 766 * the integral promotions). The result of the expression always has type 767 * (png_uint_32), however the compiler always knows it is in the range 0..7. 768 */ 769 #define PNG_TRAILBITS(pixel_bits, width) \ 770 (((pixel_bits) * ((width) % (png_uint_32)8)) % 8) 771 772 #define PNG_PADBITS(pixel_bits, width) \ 773 ((8 - PNG_TRAILBITS(pixel_bits, width)) % 8) 774 775 /* PNG_OUT_OF_RANGE returns true if value is outside the range 776 * ideal-delta..ideal+delta. Each argument is evaluated twice. 777 * "ideal" and "delta" should be constants, normally simple 778 * integers, "value" a variable. Added to libpng-1.2.6 JB 779 */ 780 #define PNG_OUT_OF_RANGE(value, ideal, delta) \ 781 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 782 783 /* Conversions between fixed and floating point, only defined if 784 * required (to make sure the code doesn't accidentally use float 785 * when it is supposedly disabled.) 786 */ 787 #ifdef PNG_FLOATING_POINT_SUPPORTED 788 /* The floating point conversion can't overflow, though it can and 789 * does lose accuracy relative to the original fixed point value. 790 * In practice this doesn't matter because png_fixed_point only 791 * stores numbers with very low precision. The png_ptr and s 792 * arguments are unused by default but are there in case error 793 * checking becomes a requirement. 794 */ 795 #define png_float(png_ptr, fixed, s) (.00001 * (fixed)) 796 797 /* The fixed point conversion performs range checking and evaluates 798 * its argument multiple times, so must be used with care. The 799 * range checking uses the PNG specification values for a signed 800 * 32-bit fixed point value except that the values are deliberately 801 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly 802 * (2^31-1) * 100000). 's' is a string that describes the value being 803 * converted. 804 * 805 * NOTE: this macro will raise a png_error if the range check fails, 806 * therefore it is normally only appropriate to use this on values 807 * that come from API calls or other sources where an out of range 808 * error indicates a programming error, not a data error! 809 * 810 * NOTE: by default this is off - the macro is not used - because the 811 * function call saves a lot of code. 812 */ 813 #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED 814 #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\ 815 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0)) 816 #endif 817 /* else the corresponding function is defined below, inside the scope of the 818 * cplusplus test. 819 */ 820 #endif 821 822 /* Constants for known chunk types. If you need to add a chunk, define the name 823 * here. For historical reasons these constants have the form png_<name>; i.e. 824 * the prefix is lower case. Please use decimal values as the parameters to 825 * match the ISO PNG specification and to avoid relying on the C locale 826 * interpretation of character values. 827 * 828 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values 829 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string 830 * to be generated if required. 831 * 832 * PNG_32b correctly produces a value shifted by up to 24 bits, even on 833 * architectures where (int) is only 16 bits. 834 */ 835 #define PNG_32b(b,s) ((png_uint_32)(b) << (s)) 836 #define PNG_U32(b1,b2,b3,b4) \ 837 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0)) 838 839 /* Constants for known chunk types. 840 * 841 * MAINTAINERS: If you need to add a chunk, define the name here. 842 * For historical reasons these constants have the form png_<name>; i.e. 843 * the prefix is lower case. Please use decimal values as the parameters to 844 * match the ISO PNG specification and to avoid relying on the C locale 845 * interpretation of character values. Please keep the list sorted. 846 * 847 * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk 848 * type. In fact the specification does not express chunk types this way, 849 * however using a 32-bit value means that the chunk type can be read from the 850 * stream using exactly the same code as used for a 32-bit unsigned value and 851 * can be examined far more efficiently (using one arithmetic compare). 852 * 853 * Prior to 1.5.6 the chunk type constants were expressed as C strings. The 854 * libpng API still uses strings for 'unknown' chunks and a macro, 855 * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice 856 * that for portable code numeric values must still be used; the string "IHDR" 857 * is not portable and neither is PNG_U32('I', 'H', 'D', 'R'). 858 * 859 * In 1.7.0 the definitions will be made public in png.h to avoid having to 860 * duplicate the same definitions in application code. 861 */ 862 #define png_IDAT PNG_U32( 73, 68, 65, 84) 863 #define png_IEND PNG_U32( 73, 69, 78, 68) 864 #define png_IHDR PNG_U32( 73, 72, 68, 82) 865 #define png_PLTE PNG_U32( 80, 76, 84, 69) 866 #define png_bKGD PNG_U32( 98, 75, 71, 68) 867 #define png_cHRM PNG_U32( 99, 72, 82, 77) 868 #define png_eXIf PNG_U32(101, 88, 73, 102) /* registered July 2017 */ 869 #define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */ 870 #define png_gAMA PNG_U32(103, 65, 77, 65) 871 #define png_gIFg PNG_U32(103, 73, 70, 103) 872 #define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */ 873 #define png_gIFx PNG_U32(103, 73, 70, 120) 874 #define png_hIST PNG_U32(104, 73, 83, 84) 875 #define png_iCCP PNG_U32(105, 67, 67, 80) 876 #define png_iTXt PNG_U32(105, 84, 88, 116) 877 #define png_oFFs PNG_U32(111, 70, 70, 115) 878 #define png_pCAL PNG_U32(112, 67, 65, 76) 879 #define png_pHYs PNG_U32(112, 72, 89, 115) 880 #define png_sBIT PNG_U32(115, 66, 73, 84) 881 #define png_sCAL PNG_U32(115, 67, 65, 76) 882 #define png_sPLT PNG_U32(115, 80, 76, 84) 883 #define png_sRGB PNG_U32(115, 82, 71, 66) 884 #define png_sTER PNG_U32(115, 84, 69, 82) 885 #define png_tEXt PNG_U32(116, 69, 88, 116) 886 #define png_tIME PNG_U32(116, 73, 77, 69) 887 #define png_tRNS PNG_U32(116, 82, 78, 83) 888 #define png_zTXt PNG_U32(122, 84, 88, 116) 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 /* Added at libpng version 1.6.0 */ 1642 #ifdef PNG_GAMMA_SUPPORTED 1643 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr, 1644 png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY); 1645 /* Set the colorspace gamma with a value provided by the application or by 1646 * the gAMA chunk on read. The value will override anything set by an ICC 1647 * profile. 1648 */ 1649 1650 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr, 1651 png_inforp info_ptr), PNG_EMPTY); 1652 /* Synchronize the info 'valid' flags with the colorspace */ 1653 1654 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr, 1655 png_inforp info_ptr), PNG_EMPTY); 1656 /* Copy the png_struct colorspace to the info_struct and call the above to 1657 * synchronize the flags. Checks for NULL info_ptr and does nothing. 1658 */ 1659 #endif 1660 1661 /* Added at libpng version 1.4.0 */ 1662 #ifdef PNG_COLORSPACE_SUPPORTED 1663 /* These internal functions are for maintaining the colorspace structure within 1664 * a png_info or png_struct (or, indeed, both). 1665 */ 1666 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities, 1667 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy, 1668 int preferred), PNG_EMPTY); 1669 1670 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints, 1671 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ, 1672 int preferred), PNG_EMPTY); 1673 1674 #ifdef PNG_sRGB_SUPPORTED 1675 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr, 1676 png_colorspacerp colorspace, int intent), PNG_EMPTY); 1677 /* This does set the colorspace gAMA and cHRM values too, but doesn't set the 1678 * flags to write them, if it returns false there was a problem and an error 1679 * message has already been output (but the colorspace may still need to be 1680 * synced to record the invalid flag). 1681 */ 1682 #endif /* sRGB */ 1683 1684 #ifdef PNG_iCCP_SUPPORTED 1685 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr, 1686 png_colorspacerp colorspace, png_const_charp name, 1687 png_uint_32 profile_length, png_const_bytep profile, int color_type), 1688 PNG_EMPTY); 1689 /* The 'name' is used for information only */ 1690 1691 /* Routines for checking parts of an ICC profile. */ 1692 #ifdef PNG_READ_iCCP_SUPPORTED 1693 PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr, 1694 png_colorspacerp colorspace, png_const_charp name, 1695 png_uint_32 profile_length), PNG_EMPTY); 1696 #endif /* READ_iCCP */ 1697 PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr, 1698 png_colorspacerp colorspace, png_const_charp name, 1699 png_uint_32 profile_length, 1700 png_const_bytep profile /* first 132 bytes only */, int color_type), 1701 PNG_EMPTY); 1702 PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr, 1703 png_colorspacerp colorspace, png_const_charp name, 1704 png_uint_32 profile_length, 1705 png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY); 1706 #ifdef PNG_sRGB_SUPPORTED 1707 PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,( 1708 png_const_structrp png_ptr, png_colorspacerp colorspace, 1709 png_const_bytep profile, uLong adler), PNG_EMPTY); 1710 /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may 1711 * be zero to indicate that it is not available. It is used, if provided, 1712 * as a fast check on the profile when checking to see if it is sRGB. 1713 */ 1714 #endif 1715 #endif /* iCCP */ 1716 1717 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1718 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients, 1719 (png_structrp png_ptr), PNG_EMPTY); 1720 /* Set the rgb_to_gray coefficients from the colorspace Y values */ 1721 #endif /* READ_RGB_TO_GRAY */ 1722 #endif /* COLORSPACE */ 1723 1724 /* Added at libpng version 1.4.0 */ 1725 PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr, 1726 png_uint_32 width, png_uint_32 height, int bit_depth, 1727 int color_type, int interlace_type, int compression_type, 1728 int filter_type),PNG_EMPTY); 1729 1730 /* Added at libpng version 1.5.10 */ 1731 #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \ 1732 defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED) 1733 PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes, 1734 (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY); 1735 #endif 1736 1737 #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) 1738 PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr, 1739 png_const_charp name),PNG_NORETURN); 1740 #endif 1741 1742 /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite 1743 * the end. Always leaves the buffer nul terminated. Never errors out (and 1744 * there is no error code.) 1745 */ 1746 PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize, 1747 size_t pos, png_const_charp string),PNG_EMPTY); 1748 1749 /* Various internal functions to handle formatted warning messages, currently 1750 * only implemented for warnings. 1751 */ 1752 #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) 1753 /* Utility to dump an unsigned value into a buffer, given a start pointer and 1754 * and end pointer (which should point just *beyond* the end of the buffer!) 1755 * Returns the pointer to the start of the formatted string. This utility only 1756 * does unsigned values. 1757 */ 1758 PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start, 1759 png_charp end, int format, png_alloc_size_t number),PNG_EMPTY); 1760 1761 /* Convenience macro that takes an array: */ 1762 #define PNG_FORMAT_NUMBER(buffer,format,number) \ 1763 png_format_number(buffer, buffer + (sizeof buffer), format, number) 1764 1765 /* Suggested size for a number buffer (enough for 64 bits and a sign!) */ 1766 #define PNG_NUMBER_BUFFER_SIZE 24 1767 1768 /* These are the integer formats currently supported, the name is formed from 1769 * the standard printf(3) format string. 1770 */ 1771 #define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */ 1772 #define PNG_NUMBER_FORMAT_02u 2 1773 #define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */ 1774 #define PNG_NUMBER_FORMAT_02d 2 1775 #define PNG_NUMBER_FORMAT_x 3 1776 #define PNG_NUMBER_FORMAT_02x 4 1777 #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */ 1778 #endif 1779 1780 #ifdef PNG_WARNINGS_SUPPORTED 1781 /* New defines and members adding in libpng-1.5.4 */ 1782 # define PNG_WARNING_PARAMETER_SIZE 32 1783 # define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */ 1784 1785 /* An l-value of this type has to be passed to the APIs below to cache the 1786 * values of the parameters to a formatted warning message. 1787 */ 1788 typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][ 1789 PNG_WARNING_PARAMETER_SIZE]; 1790 1791 PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p, 1792 int number, png_const_charp string),PNG_EMPTY); 1793 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters, 1794 * including the trailing '\0'. 1795 */ 1796 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned, 1797 (png_warning_parameters p, int number, int format, png_alloc_size_t value), 1798 PNG_EMPTY); 1799 /* Use png_alloc_size_t because it is an unsigned type as big as any we 1800 * need to output. Use the following for a signed value. 1801 */ 1802 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed, 1803 (png_warning_parameters p, int number, int format, png_int_32 value), 1804 PNG_EMPTY); 1805 1806 PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr, 1807 png_warning_parameters p, png_const_charp message),PNG_EMPTY); 1808 /* 'message' follows the X/Open approach of using @1, @2 to insert 1809 * parameters previously supplied using the above functions. Errors in 1810 * specifying the parameters will simply result in garbage substitutions. 1811 */ 1812 #endif 1813 1814 #ifdef PNG_BENIGN_ERRORS_SUPPORTED 1815 /* Application errors (new in 1.6); use these functions (declared below) for 1816 * errors in the parameters or order of API function calls on read. The 1817 * 'warning' should be used for an error that can be handled completely; the 1818 * 'error' for one which can be handled safely but which may lose application 1819 * information or settings. 1820 * 1821 * By default these both result in a png_error call prior to release, while in a 1822 * released version the 'warning' is just a warning. However if the application 1823 * explicitly disables benign errors (explicitly permitting the code to lose 1824 * information) they both turn into warnings. 1825 * 1826 * If benign errors aren't supported they end up as the corresponding base call 1827 * (png_warning or png_error.) 1828 */ 1829 PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr, 1830 png_const_charp message),PNG_EMPTY); 1831 /* The application provided invalid parameters to an API function or called 1832 * an API function at the wrong time, libpng can completely recover. 1833 */ 1834 1835 PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr, 1836 png_const_charp message),PNG_EMPTY); 1837 /* As above but libpng will ignore the call, or attempt some other partial 1838 * recovery from the error. 1839 */ 1840 #else 1841 # define png_app_warning(pp,s) png_warning(pp,s) 1842 # define png_app_error(pp,s) png_error(pp,s) 1843 #endif 1844 1845 PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr, 1846 png_const_charp message, int error),PNG_EMPTY); 1847 /* Report a recoverable issue in chunk data. On read this is used to report 1848 * a problem found while reading a particular chunk and the 1849 * png_chunk_benign_error or png_chunk_warning function is used as 1850 * appropriate. On write this is used to report an error that comes from 1851 * data set via an application call to a png_set_ API and png_app_error or 1852 * png_app_warning is used as appropriate. 1853 * 1854 * The 'error' parameter must have one of the following values: 1855 */ 1856 #define PNG_CHUNK_WARNING 0 /* never an error */ 1857 #define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */ 1858 #define PNG_CHUNK_ERROR 2 /* always an error */ 1859 1860 /* ASCII to FP interfaces, currently only implemented if sCAL 1861 * support is required. 1862 */ 1863 #if defined(PNG_sCAL_SUPPORTED) 1864 /* MAX_DIGITS is actually the maximum number of characters in an sCAL 1865 * width or height, derived from the precision (number of significant 1866 * digits - a build time settable option) and assumptions about the 1867 * maximum ridiculous exponent. 1868 */ 1869 #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/) 1870 1871 #ifdef PNG_FLOATING_POINT_SUPPORTED 1872 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr, 1873 png_charp ascii, size_t size, double fp, unsigned int precision), 1874 PNG_EMPTY); 1875 #endif /* FLOATING_POINT */ 1876 1877 #ifdef PNG_FIXED_POINT_SUPPORTED 1878 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr, 1879 png_charp ascii, size_t size, png_fixed_point fp),PNG_EMPTY); 1880 #endif /* FIXED_POINT */ 1881 #endif /* sCAL */ 1882 1883 #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) 1884 /* An internal API to validate the format of a floating point number. 1885 * The result is the index of the next character. If the number is 1886 * not valid it will be the index of a character in the supposed number. 1887 * 1888 * The format of a number is defined in the PNG extensions specification 1889 * and this API is strictly conformant to that spec, not anyone elses! 1890 * 1891 * The format as a regular expression is: 1892 * 1893 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)? 1894 * 1895 * or: 1896 * 1897 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)? 1898 * 1899 * The complexity is that either integer or fraction must be present and the 1900 * fraction is permitted to have no digits only if the integer is present. 1901 * 1902 * NOTE: The dangling E problem. 1903 * There is a PNG valid floating point number in the following: 1904 * 1905 * PNG floating point numbers are not greedy. 1906 * 1907 * Working this out requires *TWO* character lookahead (because of the 1908 * sign), the parser does not do this - it will fail at the 'r' - this 1909 * doesn't matter for PNG sCAL chunk values, but it requires more care 1910 * if the value were ever to be embedded in something more complex. Use 1911 * ANSI-C strtod if you need the lookahead. 1912 */ 1913 /* State table for the parser. */ 1914 #define PNG_FP_INTEGER 0 /* before or in integer */ 1915 #define PNG_FP_FRACTION 1 /* before or in fraction */ 1916 #define PNG_FP_EXPONENT 2 /* before or in exponent */ 1917 #define PNG_FP_STATE 3 /* mask for the above */ 1918 #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */ 1919 #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */ 1920 #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */ 1921 #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */ 1922 #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */ 1923 1924 /* These three values don't affect the parser. They are set but not used. 1925 */ 1926 #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */ 1927 #define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */ 1928 #define PNG_FP_NONZERO 256 /* A non-zero value */ 1929 #define PNG_FP_STICKY 448 /* The above three flags */ 1930 1931 /* This is available for the caller to store in 'state' if required. Do not 1932 * call the parser after setting it (the parser sometimes clears it.) 1933 */ 1934 #define PNG_FP_INVALID 512 /* Available for callers as a distinct value */ 1935 1936 /* Result codes for the parser (boolean - true meants ok, false means 1937 * not ok yet.) 1938 */ 1939 #define PNG_FP_MAYBE 0 /* The number may be valid in the future */ 1940 #define PNG_FP_OK 1 /* The number is valid */ 1941 1942 /* Tests on the sticky non-zero and negative flags. To pass these checks 1943 * the state must also indicate that the whole number is valid - this is 1944 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this 1945 * is equivalent to PNG_FP_OK above.) 1946 */ 1947 #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO) 1948 /* NZ_MASK: the string is valid and a non-zero negative value */ 1949 #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO) 1950 /* Z MASK: the string is valid and a non-zero value. */ 1951 /* PNG_FP_SAW_DIGIT: the string is valid. */ 1952 #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT) 1953 #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK) 1954 #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK) 1955 1956 /* The actual parser. This can be called repeatedly. It updates 1957 * the index into the string and the state variable (which must 1958 * be initialized to 0). It returns a result code, as above. There 1959 * is no point calling the parser any more if it fails to advance to 1960 * the end of the string - it is stuck on an invalid character (or 1961 * terminated by '\0'). 1962 * 1963 * Note that the pointer will consume an E or even an E+ and then leave 1964 * a 'maybe' state even though a preceding integer.fraction is valid. 1965 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was 1966 * a valid number. It's possible to recover from this by calling 1967 * the parser again (from the start, with state 0) but with a string 1968 * that omits the last character (i.e. set the size to the index of 1969 * the problem character.) This has not been tested within libpng. 1970 */ 1971 PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string, 1972 size_t size, int *statep, png_size_tp whereami),PNG_EMPTY); 1973 1974 /* This is the same but it checks a complete string and returns true 1975 * only if it just contains a floating point number. As of 1.5.4 this 1976 * function also returns the state at the end of parsing the number if 1977 * it was valid (otherwise it returns 0.) This can be used for testing 1978 * for negative or zero values using the sticky flag. 1979 */ 1980 PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string, 1981 size_t size),PNG_EMPTY); 1982 #endif /* pCAL || sCAL */ 1983 1984 #if defined(PNG_GAMMA_SUPPORTED) ||\ 1985 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED) 1986 /* Added at libpng version 1.5.0 */ 1987 /* This is a utility to provide a*times/div (rounded) and indicate 1988 * if there is an overflow. The result is a boolean - false (0) 1989 * for overflow, true (1) if no overflow, in which case *res 1990 * holds the result. 1991 */ 1992 PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a, 1993 png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY); 1994 #endif 1995 1996 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED) 1997 /* Same deal, but issue a warning on overflow and return 0. */ 1998 PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn, 1999 (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by, 2000 png_int_32 divided_by),PNG_EMPTY); 2001 #endif 2002 2003 #ifdef PNG_GAMMA_SUPPORTED 2004 /* Calculate a reciprocal - used for gamma values. This returns 2005 * 0 if the argument is 0 in order to maintain an undefined value; 2006 * there are no warnings. 2007 */ 2008 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a), 2009 PNG_EMPTY); 2010 2011 #ifdef PNG_READ_GAMMA_SUPPORTED 2012 /* The same but gives a reciprocal of the product of two fixed point 2013 * values. Accuracy is suitable for gamma calculations but this is 2014 * not exact - use png_muldiv for that. Only required at present on read. 2015 */ 2016 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a, 2017 png_fixed_point b),PNG_EMPTY); 2018 #endif 2019 2020 /* Return true if the gamma value is significantly different from 1.0 */ 2021 PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value), 2022 PNG_EMPTY); 2023 #endif 2024 2025 #ifdef PNG_READ_GAMMA_SUPPORTED 2026 /* Internal fixed point gamma correction. These APIs are called as 2027 * required to convert single values - they don't need to be fast, 2028 * they are not used when processing image pixel values. 2029 * 2030 * While the input is an 'unsigned' value it must actually be the 2031 * correct bit value - 0..255 or 0..65535 as required. 2032 */ 2033 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr, 2034 unsigned int value, png_fixed_point gamma_value),PNG_EMPTY); 2035 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value, 2036 png_fixed_point gamma_value),PNG_EMPTY); 2037 PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value, 2038 png_fixed_point gamma_value),PNG_EMPTY); 2039 PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr), 2040 PNG_EMPTY); 2041 PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr, 2042 int bit_depth),PNG_EMPTY); 2043 #endif 2044 2045 /* SIMPLIFIED READ/WRITE SUPPORT */ 2046 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 2047 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 2048 /* The internal structure that png_image::opaque points to. */ 2049 typedef struct png_control 2050 { 2051 png_structp png_ptr; 2052 png_infop info_ptr; 2053 png_voidp error_buf; /* Always a jmp_buf at present. */ 2054 2055 png_const_bytep memory; /* Memory buffer. */ 2056 size_t size; /* Size of the memory buffer. */ 2057 2058 unsigned int for_write :1; /* Otherwise it is a read structure */ 2059 unsigned int owned_file :1; /* We own the file in io_ptr */ 2060 } png_control; 2061 2062 /* Return the pointer to the jmp_buf from a png_control: necessary because C 2063 * does not reveal the type of the elements of jmp_buf. 2064 */ 2065 #ifdef __cplusplus 2066 # define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0]) 2067 #else 2068 # define png_control_jmp_buf(pc) ((pc)->error_buf) 2069 #endif 2070 2071 /* Utility to safely execute a piece of libpng code catching and logging any 2072 * errors that might occur. Returns true on success, false on failure (either 2073 * of the function or as a result of a png_error.) 2074 */ 2075 PNG_INTERNAL_CALLBACK(void,png_safe_error,(png_structp png_ptr, 2076 png_const_charp error_message),PNG_NORETURN); 2077 2078 #ifdef PNG_WARNINGS_SUPPORTED 2079 PNG_INTERNAL_CALLBACK(void,png_safe_warning,(png_structp png_ptr, 2080 png_const_charp warning_message),PNG_EMPTY); 2081 #else 2082 # define png_safe_warning 0/*dummy argument*/ 2083 #endif 2084 2085 PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image, 2086 int (*function)(png_voidp), png_voidp arg),PNG_EMPTY); 2087 2088 /* Utility to log an error; this also cleans up the png_image; the function 2089 * always returns 0 (false). 2090 */ 2091 PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image, 2092 png_const_charp error_message),PNG_EMPTY); 2093 2094 #ifndef PNG_SIMPLIFIED_READ_SUPPORTED 2095 /* png_image_free is used by the write code but not exported */ 2096 PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY); 2097 #endif /* !SIMPLIFIED_READ */ 2098 2099 #endif /* SIMPLIFIED READ/WRITE */ 2100 2101 /* These are initialization functions for hardware specific PNG filter 2102 * optimizations; list these here then select the appropriate one at compile 2103 * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined 2104 * the generic code is used. 2105 */ 2106 #ifdef PNG_FILTER_OPTIMIZATIONS 2107 PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr, 2108 unsigned int bpp), PNG_EMPTY); 2109 /* Just declare the optimization that will be used */ 2110 #else 2111 /* List *all* the possible optimizations here - this branch is required if 2112 * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in 2113 * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing. 2114 */ 2115 # if PNG_ARM_NEON_OPT > 0 2116 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon, 2117 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2118 #endif 2119 2120 #if PNG_MIPS_MSA_OPT > 0 2121 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_msa, 2122 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2123 #endif 2124 2125 # if PNG_INTEL_SSE_IMPLEMENTATION > 0 2126 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_sse2, 2127 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2128 # endif 2129 #endif 2130 2131 PNG_INTERNAL_FUNCTION(png_uint_32, png_check_keyword, (png_structrp png_ptr, 2132 png_const_charp key, png_bytep new_key), PNG_EMPTY); 2133 2134 #if PNG_ARM_NEON_IMPLEMENTATION == 1 2135 PNG_INTERNAL_FUNCTION(void, 2136 png_riffle_palette_neon, 2137 (png_structrp), 2138 PNG_EMPTY); 2139 PNG_INTERNAL_FUNCTION(int, 2140 png_do_expand_palette_rgba8_neon, 2141 (png_structrp, 2142 png_row_infop, 2143 png_const_bytep, 2144 const png_bytepp, 2145 const png_bytepp), 2146 PNG_EMPTY); 2147 PNG_INTERNAL_FUNCTION(int, 2148 png_do_expand_palette_rgb8_neon, 2149 (png_structrp, 2150 png_row_infop, 2151 png_const_bytep, 2152 const png_bytepp, 2153 const png_bytepp), 2154 PNG_EMPTY); 2155 #endif 2156 2157 /* Maintainer: Put new private prototypes here ^ */ 2158 2159 #include "pngdebug.h" 2160 2161 #ifdef __cplusplus 2162 } 2163 #endif 2164 2165 #endif /* PNG_VERSION_INFO_ONLY */ 2166 #endif /* PNGPRIV_H */ 2167