1 2 /* pngpriv.h - private declarations for use inside libpng 3 * 4 * Last changed in libpng 1.6.25 [September 1, 2016] 5 * Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson 6 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) 7 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) 8 * 9 * This code is released under the libpng license. 10 * For conditions of distribution and use, see the disclaimer 11 * and license in png.h 12 */ 13 14 /* The symbols declared in this file (including the functions declared 15 * as extern) are PRIVATE. They are not part of the libpng public 16 * interface, and are not recommended for use by regular applications. 17 * Some of them may become public in the future; others may stay private, 18 * change in an incompatible way, or even disappear. 19 * Although the libpng users are not forbidden to include this header, 20 * they should be well aware of the issues that may arise from doing so. 21 */ 22 23 #ifndef PNGPRIV_H 24 #define PNGPRIV_H 25 26 /* Feature Test Macros. The following are defined here to ensure that correctly 27 * implemented libraries reveal the APIs libpng needs to build and hide those 28 * that are not needed and potentially damaging to the compilation. 29 * 30 * Feature Test Macros must be defined before any system header is included (see 31 * POSIX 1003.1 2.8.2 "POSIX Symbols." 32 * 33 * These macros only have an effect if the operating system supports either 34 * POSIX 1003.1 or C99, or both. On other operating systems (particularly 35 * Windows/Visual Studio) there is no effect; the OS specific tests below are 36 * still required (as of 2011-05-02.) 37 */ 38 #define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */ 39 40 #ifndef PNG_VERSION_INFO_ONLY 41 /* Standard library headers not required by png.h: */ 42 # include <stdlib.h> 43 # include <string.h> 44 #endif 45 46 #define PNGLIB_BUILD /*libpng is being built, not used*/ 47 48 /* If HAVE_CONFIG_H is defined during the build then the build system must 49 * provide an appropriate "config.h" file on the include path. The header file 50 * must provide definitions as required below (search for "HAVE_CONFIG_H"); 51 * see configure.ac for more details of the requirements. The macro 52 * "PNG_NO_CONFIG_H" is provided for maintainers to test for dependencies on 53 * 'configure'; define this macro to prevent the configure build including the 54 * configure generated config.h. Libpng is expected to compile without *any* 55 * special build system support on a reasonably ANSI-C compliant system. 56 */ 57 #if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H) 58 # include <config.h> 59 60 /* Pick up the definition of 'restrict' from config.h if it was read: */ 61 # define PNG_RESTRICT restrict 62 #endif 63 64 /* To support symbol prefixing it is necessary to know *before* including png.h 65 * whether the fixed point (and maybe other) APIs are exported, because if they 66 * are not internal definitions may be required. This is handled below just 67 * before png.h is included, but load the configuration now if it is available. 68 */ 69 #ifndef PNGLCONF_H 70 # include "pnglibconf.h" 71 #endif 72 73 /* Local renames may change non-exported API functions from png.h */ 74 #if defined(PNG_PREFIX) && !defined(PNGPREFIX_H) 75 # include "pngprefix.h" 76 #endif 77 78 #ifdef PNG_USER_CONFIG 79 # include "pngusr.h" 80 /* These should have been defined in pngusr.h */ 81 # ifndef PNG_USER_PRIVATEBUILD 82 # define PNG_USER_PRIVATEBUILD "Custom libpng build" 83 # endif 84 # ifndef PNG_USER_DLLFNAME_POSTFIX 85 # define PNG_USER_DLLFNAME_POSTFIX "Cb" 86 # endif 87 #endif 88 89 /* Compile time options. 90 * ===================== 91 * In a multi-arch build the compiler may compile the code several times for the 92 * same object module, producing different binaries for different architectures. 93 * When this happens configure-time setting of the target host options cannot be 94 * done and this interferes with the handling of the ARM NEON optimizations, and 95 * possibly other similar optimizations. Put additional tests here; in general 96 * this is needed when the same option can be changed at both compile time and 97 * run time depending on the target OS (i.e. iOS vs Android.) 98 * 99 * NOTE: symbol prefixing does not pass $(CFLAGS) to the preprocessor, because 100 * this is not possible with certain compilers (Oracle SUN OS CC), as a result 101 * it is necessary to ensure that all extern functions that *might* be used 102 * regardless of $(CFLAGS) get declared in this file. The test on __ARM_NEON__ 103 * below is one example of this behavior because it is controlled by the 104 * presence or not of -mfpu=neon on the GCC command line, it is possible to do 105 * this in $(CC), e.g. "CC=gcc -mfpu=neon", but people who build libpng rarely 106 * do this. 107 */ 108 #ifndef PNG_ARM_NEON_OPT 109 /* ARM NEON optimizations are being controlled by the compiler settings, 110 * typically the target FPU. If the FPU has been set to NEON (-mfpu=neon 111 * with GCC) then the compiler will define __ARM_NEON__ and we can rely 112 * unconditionally on NEON instructions not crashing, otherwise we must 113 * disable use of NEON instructions. 114 * 115 * NOTE: at present these optimizations depend on 'ALIGNED_MEMORY', so they 116 * can only be turned on automatically if that is supported too. If 117 * PNG_ARM_NEON_OPT is set in CPPFLAGS (to >0) then arm/arm_init.c will fail 118 * to compile with an appropriate #error if ALIGNED_MEMORY has been turned 119 * off. 120 * 121 * Note that gcc-4.9 defines __ARM_NEON instead of the deprecated 122 * __ARM_NEON__, so we check both variants. 123 * 124 * To disable ARM_NEON optimizations entirely, and skip compiling the 125 * associated assembler code, pass --enable-arm-neon=no to configure 126 * or put -DPNG_ARM_NEON_OPT=0 in CPPFLAGS. 127 */ 128 # if (defined(__ARM_NEON__) || defined(__ARM_NEON)) && \ 129 defined(PNG_ALIGNED_MEMORY_SUPPORTED) 130 # define PNG_ARM_NEON_OPT 2 131 # else 132 # define PNG_ARM_NEON_OPT 0 133 # endif 134 #endif 135 136 #if PNG_ARM_NEON_OPT > 0 137 /* NEON optimizations are to be at least considered by libpng, so enable the 138 * callbacks to do this. 139 */ 140 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_neon 141 142 /* By default the 'intrinsics' code in arm/filter_neon_intrinsics.c is used 143 * if possible - if __ARM_NEON__ is set and the compiler version is not known 144 * to be broken. This is controlled by PNG_ARM_NEON_IMPLEMENTATION which can 145 * be: 146 * 147 * 1 The intrinsics code (the default with __ARM_NEON__) 148 * 2 The hand coded assembler (the default without __ARM_NEON__) 149 * 150 * It is possible to set PNG_ARM_NEON_IMPLEMENTATION in CPPFLAGS, however 151 * this is *NOT* supported and may cease to work even after a minor revision 152 * to libpng. It *is* valid to do this for testing purposes, e.g. speed 153 * testing or a new compiler, but the results should be communicated to the 154 * libpng implementation list for incorporation in the next minor release. 155 */ 156 # ifndef PNG_ARM_NEON_IMPLEMENTATION 157 # if defined(__ARM_NEON__) || defined(__ARM_NEON) 158 # if defined(__clang__) 159 /* At present it is unknown by the libpng developers which versions 160 * of clang support the intrinsics, however some or perhaps all 161 * versions do not work with the assembler so this may be 162 * irrelevant, so just use the default (do nothing here.) 163 */ 164 # elif defined(__GNUC__) 165 /* GCC 4.5.4 NEON support is known to be broken. 4.6.3 is known to 166 * work, so if this *is* GCC, or G++, look for a version >4.5 167 */ 168 # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6) 169 # define PNG_ARM_NEON_IMPLEMENTATION 2 170 # endif /* no GNUC support */ 171 # endif /* __GNUC__ */ 172 # else /* !defined __ARM_NEON__ */ 173 /* The 'intrinsics' code simply won't compile without this -mfpu=neon: 174 */ 175 # define PNG_ARM_NEON_IMPLEMENTATION 2 176 # endif /* __ARM_NEON__ */ 177 # endif /* !PNG_ARM_NEON_IMPLEMENTATION */ 178 179 # ifndef PNG_ARM_NEON_IMPLEMENTATION 180 /* Use the intrinsics code by default. */ 181 # define PNG_ARM_NEON_IMPLEMENTATION 1 182 # endif 183 #endif /* PNG_ARM_NEON_OPT > 0 */ 184 185 #ifndef PNG_MIPS_MSA_OPT 186 # if defined(__mips_msa) && (__mips_isa_rev >= 5) && defined(PNG_ALIGNED_MEMORY_SUPPORTED) 187 # define PNG_MIPS_MSA_OPT 2 188 # else 189 # define PNG_MIPS_MSA_OPT 0 190 # endif 191 #endif 192 193 #ifndef PNG_INTEL_SSE_OPT 194 # ifdef PNG_INTEL_SSE 195 /* Only check for SSE if the build configuration has been modified to 196 * enable SSE optimizations. This means that these optimizations will 197 * be off by default. See contrib/intel for more details. 198 */ 199 # if defined(__SSE4_1__) || defined(__AVX__) || defined(__SSSE3__) || \ 200 defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \ 201 (defined(_M_IX86_FP) && _M_IX86_FP >= 2) 202 # define PNG_INTEL_SSE_OPT 1 203 # endif 204 # endif 205 #endif 206 207 #if PNG_INTEL_SSE_OPT > 0 208 # ifndef PNG_INTEL_SSE_IMPLEMENTATION 209 # if defined(__SSE4_1__) || defined(__AVX__) 210 /* We are not actually using AVX, but checking for AVX is the best 211 way we can detect SSE4.1 and SSSE3 on MSVC. 212 */ 213 # define PNG_INTEL_SSE_IMPLEMENTATION 3 214 # elif defined(__SSSE3__) 215 # define PNG_INTEL_SSE_IMPLEMENTATION 2 216 # elif defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \ 217 (defined(_M_IX86_FP) && _M_IX86_FP >= 2) 218 # define PNG_INTEL_SSE_IMPLEMENTATION 1 219 # else 220 # define PNG_INTEL_SSE_IMPLEMENTATION 0 221 # endif 222 # endif 223 224 # if PNG_INTEL_SSE_IMPLEMENTATION > 0 225 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_sse2 226 # endif 227 #endif 228 229 #if PNG_MIPS_MSA_OPT > 0 230 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_msa 231 # ifndef PNG_MIPS_MSA_IMPLEMENTATION 232 # if defined(__mips_msa) 233 # if defined(__clang__) 234 # elif defined(__GNUC__) 235 # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7) 236 # define PNG_MIPS_MSA_IMPLEMENTATION 2 237 # endif /* no GNUC support */ 238 # endif /* __GNUC__ */ 239 # else /* !defined __mips_msa */ 240 # define PNG_MIPS_MSA_IMPLEMENTATION 2 241 # endif /* __mips_msa */ 242 # endif /* !PNG_MIPS_MSA_IMPLEMENTATION */ 243 244 # ifndef PNG_MIPS_MSA_IMPLEMENTATION 245 # define PNG_MIPS_MSA_IMPLEMENTATION 1 246 # endif 247 #endif /* PNG_MIPS_MSA_OPT > 0 */ 248 249 250 /* Is this a build of a DLL where compilation of the object modules requires 251 * different preprocessor settings to those required for a simple library? If 252 * so PNG_BUILD_DLL must be set. 253 * 254 * If libpng is used inside a DLL but that DLL does not export the libpng APIs 255 * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a 256 * static library of libpng then link the DLL against that. 257 */ 258 #ifndef PNG_BUILD_DLL 259 # ifdef DLL_EXPORT 260 /* This is set by libtool when files are compiled for a DLL; libtool 261 * always compiles twice, even on systems where it isn't necessary. Set 262 * PNG_BUILD_DLL in case it is necessary: 263 */ 264 # define PNG_BUILD_DLL 265 # else 266 # ifdef _WINDLL 267 /* This is set by the Microsoft Visual Studio IDE in projects that 268 * build a DLL. It can't easily be removed from those projects (it 269 * isn't visible in the Visual Studio UI) so it is a fairly reliable 270 * indication that PNG_IMPEXP needs to be set to the DLL export 271 * attributes. 272 */ 273 # define PNG_BUILD_DLL 274 # else 275 # ifdef __DLL__ 276 /* This is set by the Borland C system when compiling for a DLL 277 * (as above.) 278 */ 279 # define PNG_BUILD_DLL 280 # else 281 /* Add additional compiler cases here. */ 282 # endif 283 # endif 284 # endif 285 #endif /* Setting PNG_BUILD_DLL if required */ 286 287 /* See pngconf.h for more details: the builder of the library may set this on 288 * the command line to the right thing for the specific compilation system or it 289 * may be automagically set above (at present we know of no system where it does 290 * need to be set on the command line.) 291 * 292 * PNG_IMPEXP must be set here when building the library to prevent pngconf.h 293 * setting it to the "import" setting for a DLL build. 294 */ 295 #ifndef PNG_IMPEXP 296 # ifdef PNG_BUILD_DLL 297 # define PNG_IMPEXP PNG_DLL_EXPORT 298 # else 299 /* Not building a DLL, or the DLL doesn't require specific export 300 * definitions. 301 */ 302 # define PNG_IMPEXP 303 # endif 304 #endif 305 306 /* No warnings for private or deprecated functions in the build: */ 307 #ifndef PNG_DEPRECATED 308 # define PNG_DEPRECATED 309 #endif 310 #ifndef PNG_PRIVATE 311 # define PNG_PRIVATE 312 #endif 313 314 /* Symbol preprocessing support. 315 * 316 * To enable listing global, but internal, symbols the following macros should 317 * always be used to declare an extern data or function object in this file. 318 */ 319 #ifndef PNG_INTERNAL_DATA 320 # define PNG_INTERNAL_DATA(type, name, array) PNG_LINKAGE_DATA type name array 321 #endif 322 323 #ifndef PNG_INTERNAL_FUNCTION 324 # define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\ 325 PNG_LINKAGE_FUNCTION PNG_FUNCTION(type, name, args, PNG_EMPTY attributes) 326 #endif 327 328 #ifndef PNG_INTERNAL_CALLBACK 329 # define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\ 330 PNG_LINKAGE_CALLBACK PNG_FUNCTION(type, (PNGCBAPI name), args,\ 331 PNG_EMPTY attributes) 332 #endif 333 334 /* If floating or fixed point APIs are disabled they may still be compiled 335 * internally. To handle this make sure they are declared as the appropriate 336 * internal extern function (otherwise the symbol prefixing stuff won't work and 337 * the functions will be used without definitions.) 338 * 339 * NOTE: although all the API functions are declared here they are not all 340 * actually built! Because the declarations are still made it is necessary to 341 * fake out types that they depend on. 342 */ 343 #ifndef PNG_FP_EXPORT 344 # ifndef PNG_FLOATING_POINT_SUPPORTED 345 # define PNG_FP_EXPORT(ordinal, type, name, args)\ 346 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 347 # ifndef PNG_VERSION_INFO_ONLY 348 typedef struct png_incomplete png_double; 349 typedef png_double* png_doublep; 350 typedef const png_double* png_const_doublep; 351 typedef png_double** png_doublepp; 352 # endif 353 # endif 354 #endif 355 #ifndef PNG_FIXED_EXPORT 356 # ifndef PNG_FIXED_POINT_SUPPORTED 357 # define PNG_FIXED_EXPORT(ordinal, type, name, args)\ 358 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 359 # endif 360 #endif 361 362 #include "png.h" 363 364 /* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */ 365 #ifndef PNG_DLL_EXPORT 366 # define PNG_DLL_EXPORT 367 #endif 368 369 /* This is a global switch to set the compilation for an installed system 370 * (a release build). It can be set for testing debug builds to ensure that 371 * they will compile when the build type is switched to RC or STABLE, the 372 * default is just to use PNG_LIBPNG_BUILD_BASE_TYPE. Set this in CPPFLAGS 373 * with either: 374 * 375 * -DPNG_RELEASE_BUILD Turns on the release compile path 376 * -DPNG_RELEASE_BUILD=0 Turns it off 377 * or in your pngusr.h with 378 * #define PNG_RELEASE_BUILD=1 Turns on the release compile path 379 * #define PNG_RELEASE_BUILD=0 Turns it off 380 */ 381 #ifndef PNG_RELEASE_BUILD 382 # define PNG_RELEASE_BUILD (PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC) 383 #endif 384 385 /* SECURITY and SAFETY: 386 * 387 * libpng is built with support for internal limits on image dimensions and 388 * memory usage. These are documented in scripts/pnglibconf.dfa of the 389 * source and recorded in the machine generated header file pnglibconf.h. 390 */ 391 392 /* If you are running on a machine where you cannot allocate more 393 * than 64K of memory at once, uncomment this. While libpng will not 394 * normally need that much memory in a chunk (unless you load up a very 395 * large file), zlib needs to know how big of a chunk it can use, and 396 * libpng thus makes sure to check any memory allocation to verify it 397 * will fit into memory. 398 * 399 * zlib provides 'MAXSEG_64K' which, if defined, indicates the 400 * same limit and pngconf.h (already included) sets the limit 401 * if certain operating systems are detected. 402 */ 403 #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K) 404 # define PNG_MAX_MALLOC_64K 405 #endif 406 407 #ifndef PNG_UNUSED 408 /* Unused formal parameter warnings are silenced using the following macro 409 * which is expected to have no bad effects on performance (optimizing 410 * compilers will probably remove it entirely). Note that if you replace 411 * it with something other than whitespace, you must include the terminating 412 * semicolon. 413 */ 414 # define PNG_UNUSED(param) (void)param; 415 #endif 416 417 /* Just a little check that someone hasn't tried to define something 418 * contradictory. 419 */ 420 #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K) 421 # undef PNG_ZBUF_SIZE 422 # define PNG_ZBUF_SIZE 65536L 423 #endif 424 425 /* If warnings or errors are turned off the code is disabled or redirected here. 426 * From 1.5.4 functions have been added to allow very limited formatting of 427 * error and warning messages - this code will also be disabled here. 428 */ 429 #ifdef PNG_WARNINGS_SUPPORTED 430 # define PNG_WARNING_PARAMETERS(p) png_warning_parameters p; 431 #else 432 # define png_warning_parameter(p,number,string) ((void)0) 433 # define png_warning_parameter_unsigned(p,number,format,value) ((void)0) 434 # define png_warning_parameter_signed(p,number,format,value) ((void)0) 435 # define png_formatted_warning(pp,p,message) ((void)(pp)) 436 # define PNG_WARNING_PARAMETERS(p) 437 #endif 438 #ifndef PNG_ERROR_TEXT_SUPPORTED 439 # define png_fixed_error(s1,s2) png_err(s1) 440 #endif 441 442 /* C allows up-casts from (void*) to any pointer and (const void*) to any 443 * pointer to a const object. C++ regards this as a type error and requires an 444 * explicit, static, cast and provides the static_cast<> rune to ensure that 445 * const is not cast away. 446 */ 447 #ifdef __cplusplus 448 # define png_voidcast(type, value) static_cast<type>(value) 449 # define png_constcast(type, value) const_cast<type>(value) 450 # define png_aligncast(type, value) \ 451 static_cast<type>(static_cast<void*>(value)) 452 # define png_aligncastconst(type, value) \ 453 static_cast<type>(static_cast<const void*>(value)) 454 #else 455 # define png_voidcast(type, value) (value) 456 # define png_constcast(type, value) ((type)(value)) 457 # define png_aligncast(type, value) ((void*)(value)) 458 # define png_aligncastconst(type, value) ((const void*)(value)) 459 #endif /* __cplusplus */ 460 461 /* Some fixed point APIs are still required even if not exported because 462 * they get used by the corresponding floating point APIs. This magic 463 * deals with this: 464 */ 465 #ifdef PNG_FIXED_POINT_SUPPORTED 466 # define PNGFAPI PNGAPI 467 #else 468 # define PNGFAPI /* PRIVATE */ 469 #endif 470 471 #ifndef PNG_VERSION_INFO_ONLY 472 /* Other defines specific to compilers can go here. Try to keep 473 * them inside an appropriate ifdef/endif pair for portability. 474 */ 475 #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\ 476 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) 477 /* png.c requires the following ANSI-C constants if the conversion of 478 * floating point to ASCII is implemented therein: 479 * 480 * DBL_DIG Maximum number of decimal digits (can be set to any constant) 481 * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value) 482 * DBL_MAX Maximum floating point number (can be set to an arbitrary value) 483 */ 484 # include <float.h> 485 486 # if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \ 487 defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC) 488 /* We need to check that <math.h> hasn't already been included earlier 489 * as it seems it doesn't agree with <fp.h>, yet we should really use 490 * <fp.h> if possible. 491 */ 492 # if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__) 493 # include <fp.h> 494 # endif 495 # else 496 # include <math.h> 497 # endif 498 # if defined(_AMIGA) && defined(__SASC) && defined(_M68881) 499 /* Amiga SAS/C: We must include builtin FPU functions when compiling using 500 * MATH=68881 501 */ 502 # include <m68881.h> 503 # endif 504 #endif 505 506 /* This provides the non-ANSI (far) memory allocation routines. */ 507 #if defined(__TURBOC__) && defined(__MSDOS__) 508 # include <mem.h> 509 # include <alloc.h> 510 #endif 511 512 #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \ 513 defined(_WIN32) || defined(__WIN32__) 514 # include <windows.h> /* defines _WINDOWS_ macro */ 515 #endif 516 #endif /* PNG_VERSION_INFO_ONLY */ 517 518 /* Moved here around 1.5.0beta36 from pngconf.h */ 519 /* Users may want to use these so they are not private. Any library 520 * functions that are passed far data must be model-independent. 521 */ 522 523 /* Memory model/platform independent fns */ 524 #ifndef PNG_ABORT 525 # ifdef _WINDOWS_ 526 # define PNG_ABORT() ExitProcess(0) 527 # else 528 # define PNG_ABORT() abort() 529 # endif 530 #endif 531 532 /* These macros may need to be architecture dependent. */ 533 #define PNG_ALIGN_NONE 0 /* do not use data alignment */ 534 #define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */ 535 #ifdef offsetof 536 # define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */ 537 #else 538 # define PNG_ALIGN_OFFSET -1 /* prevent the use of this */ 539 #endif 540 #define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */ 541 542 #ifndef PNG_ALIGN_TYPE 543 /* Default to using aligned access optimizations and requiring alignment to a 544 * multiple of the data type size. Override in a compiler specific fashion 545 * if necessary by inserting tests here: 546 */ 547 # define PNG_ALIGN_TYPE PNG_ALIGN_SIZE 548 #endif 549 550 #if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE 551 /* This is used because in some compiler implementations non-aligned 552 * structure members are supported, so the offsetof approach below fails. 553 * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access 554 * is good for performance. Do not do this unless you have tested the result 555 * and understand it. 556 */ 557 # define png_alignof(type) (sizeof (type)) 558 #else 559 # if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET 560 # define png_alignof(type) offsetof(struct{char c; type t;}, t) 561 # else 562 # if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS 563 # define png_alignof(type) (1) 564 # endif 565 /* Else leave png_alignof undefined to prevent use thereof */ 566 # endif 567 #endif 568 569 /* This implicitly assumes alignment is always to a power of 2. */ 570 #ifdef png_alignof 571 # define png_isaligned(ptr, type)\ 572 ((((const char*)ptr-(const char*)0) & (png_alignof(type)-1)) == 0) 573 #else 574 # define png_isaligned(ptr, type) 0 575 #endif 576 577 /* End of memory model/platform independent support */ 578 /* End of 1.5.0beta36 move from pngconf.h */ 579 580 /* CONSTANTS and UTILITY MACROS 581 * These are used internally by libpng and not exposed in the API 582 */ 583 584 /* Various modes of operation. Note that after an init, mode is set to 585 * zero automatically when the structure is created. Three of these 586 * are defined in png.h because they need to be visible to applications 587 * that call png_set_unknown_chunk(). 588 */ 589 /* #define PNG_HAVE_IHDR 0x01 (defined in png.h) */ 590 /* #define PNG_HAVE_PLTE 0x02 (defined in png.h) */ 591 #define PNG_HAVE_IDAT 0x04 592 /* #define PNG_AFTER_IDAT 0x08 (defined in png.h) */ 593 #define PNG_HAVE_IEND 0x10 594 /* 0x20 (unused) */ 595 /* 0x40 (unused) */ 596 /* 0x80 (unused) */ 597 #define PNG_HAVE_CHUNK_HEADER 0x100 598 #define PNG_WROTE_tIME 0x200 599 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400 600 #define PNG_BACKGROUND_IS_GRAY 0x800 601 #define PNG_HAVE_PNG_SIGNATURE 0x1000 602 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ 603 /* 0x4000 (unused) */ 604 #define PNG_IS_READ_STRUCT 0x8000 /* Else is a write struct */ 605 606 /* Flags for the transformations the PNG library does on the image data */ 607 #define PNG_BGR 0x0001 608 #define PNG_INTERLACE 0x0002 609 #define PNG_PACK 0x0004 610 #define PNG_SHIFT 0x0008 611 #define PNG_SWAP_BYTES 0x0010 612 #define PNG_INVERT_MONO 0x0020 613 #define PNG_QUANTIZE 0x0040 614 #define PNG_COMPOSE 0x0080 /* Was PNG_BACKGROUND */ 615 #define PNG_BACKGROUND_EXPAND 0x0100 616 #define PNG_EXPAND_16 0x0200 /* Added to libpng 1.5.2 */ 617 #define PNG_16_TO_8 0x0400 /* Becomes 'chop' in 1.5.4 */ 618 #define PNG_RGBA 0x0800 619 #define PNG_EXPAND 0x1000 620 #define PNG_GAMMA 0x2000 621 #define PNG_GRAY_TO_RGB 0x4000 622 #define PNG_FILLER 0x8000 623 #define PNG_PACKSWAP 0x10000 624 #define PNG_SWAP_ALPHA 0x20000 625 #define PNG_STRIP_ALPHA 0x40000 626 #define PNG_INVERT_ALPHA 0x80000 627 #define PNG_USER_TRANSFORM 0x100000 628 #define PNG_RGB_TO_GRAY_ERR 0x200000 629 #define PNG_RGB_TO_GRAY_WARN 0x400000 630 #define PNG_RGB_TO_GRAY 0x600000 /* two bits, RGB_TO_GRAY_ERR|WARN */ 631 #define PNG_ENCODE_ALPHA 0x800000 /* Added to libpng-1.5.4 */ 632 #define PNG_ADD_ALPHA 0x1000000 /* Added to libpng-1.2.7 */ 633 #define PNG_EXPAND_tRNS 0x2000000 /* Added to libpng-1.2.9 */ 634 #define PNG_SCALE_16_TO_8 0x4000000 /* Added to libpng-1.5.4 */ 635 /* 0x8000000 unused */ 636 /* 0x10000000 unused */ 637 /* 0x20000000 unused */ 638 /* 0x40000000 unused */ 639 /* Flags for png_create_struct */ 640 #define PNG_STRUCT_PNG 0x0001 641 #define PNG_STRUCT_INFO 0x0002 642 643 /* Flags for the png_ptr->flags rather than declaring a byte for each one */ 644 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 645 #define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002 /* Added to libpng-1.6.0 */ 646 /* 0x0004 unused */ 647 #define PNG_FLAG_ZSTREAM_ENDED 0x0008 /* Added to libpng-1.6.0 */ 648 /* 0x0010 unused */ 649 /* 0x0020 unused */ 650 #define PNG_FLAG_ROW_INIT 0x0040 651 #define PNG_FLAG_FILLER_AFTER 0x0080 652 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 653 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 654 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 655 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 656 #define PNG_FLAG_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.4 */ 657 #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.4 */ 658 #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.4 */ 659 /* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000 */ 660 /* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000 */ 661 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000 662 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000 663 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000 664 #define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000 /* Added to libpng-1.4.0 */ 665 #define PNG_FLAG_APP_WARNINGS_WARN 0x200000 /* Added to libpng-1.6.0 */ 666 #define PNG_FLAG_APP_ERRORS_WARN 0x400000 /* Added to libpng-1.6.0 */ 667 /* 0x800000 unused */ 668 /* 0x1000000 unused */ 669 /* 0x2000000 unused */ 670 /* 0x4000000 unused */ 671 /* 0x8000000 unused */ 672 /* 0x10000000 unused */ 673 /* 0x20000000 unused */ 674 /* 0x40000000 unused */ 675 676 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 677 PNG_FLAG_CRC_ANCILLARY_NOWARN) 678 679 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 680 PNG_FLAG_CRC_CRITICAL_IGNORE) 681 682 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 683 PNG_FLAG_CRC_CRITICAL_MASK) 684 685 /* Save typing and make code easier to understand */ 686 687 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 688 abs((int)((c1).green) - (int)((c2).green)) + \ 689 abs((int)((c1).blue) - (int)((c2).blue))) 690 691 /* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255 692 * by dividing by 257 *with rounding*. This macro is exact for the given range. 693 * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the 694 * macro were established by experiment (modifying the added value). The macro 695 * has a second variant that takes a value already scaled by 255 and divides by 696 * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it 697 * only gives off-by-one errors and only for 0.5% (1 in 200) of the values. 698 */ 699 #define PNG_DIV65535(v24) (((v24) + 32895) >> 16) 700 #define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255) 701 702 /* Added to libpng-1.2.6 JB */ 703 #define PNG_ROWBYTES(pixel_bits, width) \ 704 ((pixel_bits) >= 8 ? \ 705 ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \ 706 (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) ) 707 708 /* PNG_OUT_OF_RANGE returns true if value is outside the range 709 * ideal-delta..ideal+delta. Each argument is evaluated twice. 710 * "ideal" and "delta" should be constants, normally simple 711 * integers, "value" a variable. Added to libpng-1.2.6 JB 712 */ 713 #define PNG_OUT_OF_RANGE(value, ideal, delta) \ 714 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 715 716 /* Conversions between fixed and floating point, only defined if 717 * required (to make sure the code doesn't accidentally use float 718 * when it is supposedly disabled.) 719 */ 720 #ifdef PNG_FLOATING_POINT_SUPPORTED 721 /* The floating point conversion can't overflow, though it can and 722 * does lose accuracy relative to the original fixed point value. 723 * In practice this doesn't matter because png_fixed_point only 724 * stores numbers with very low precision. The png_ptr and s 725 * arguments are unused by default but are there in case error 726 * checking becomes a requirement. 727 */ 728 #define png_float(png_ptr, fixed, s) (.00001 * (fixed)) 729 730 /* The fixed point conversion performs range checking and evaluates 731 * its argument multiple times, so must be used with care. The 732 * range checking uses the PNG specification values for a signed 733 * 32-bit fixed point value except that the values are deliberately 734 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly 735 * (2^31-1) * 100000). 's' is a string that describes the value being 736 * converted. 737 * 738 * NOTE: this macro will raise a png_error if the range check fails, 739 * therefore it is normally only appropriate to use this on values 740 * that come from API calls or other sources where an out of range 741 * error indicates a programming error, not a data error! 742 * 743 * NOTE: by default this is off - the macro is not used - because the 744 * function call saves a lot of code. 745 */ 746 #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED 747 #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\ 748 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0)) 749 #endif 750 /* else the corresponding function is defined below, inside the scope of the 751 * cplusplus test. 752 */ 753 #endif 754 755 /* Constants for known chunk types. If you need to add a chunk, define the name 756 * here. For historical reasons these constants have the form png_<name>; i.e. 757 * the prefix is lower case. Please use decimal values as the parameters to 758 * match the ISO PNG specification and to avoid relying on the C locale 759 * interpretation of character values. 760 * 761 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values 762 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string 763 * to be generated if required. 764 * 765 * PNG_32b correctly produces a value shifted by up to 24 bits, even on 766 * architectures where (int) is only 16 bits. 767 */ 768 #define PNG_32b(b,s) ((png_uint_32)(b) << (s)) 769 #define PNG_U32(b1,b2,b3,b4) \ 770 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0)) 771 772 /* Constants for known chunk types. 773 * 774 * MAINTAINERS: If you need to add a chunk, define the name here. 775 * For historical reasons these constants have the form png_<name>; i.e. 776 * the prefix is lower case. Please use decimal values as the parameters to 777 * match the ISO PNG specification and to avoid relying on the C locale 778 * interpretation of character values. Please keep the list sorted. 779 * 780 * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk 781 * type. In fact the specification does not express chunk types this way, 782 * however using a 32-bit value means that the chunk type can be read from the 783 * stream using exactly the same code as used for a 32-bit unsigned value and 784 * can be examined far more efficiently (using one arithmetic compare). 785 * 786 * Prior to 1.5.6 the chunk type constants were expressed as C strings. The 787 * libpng API still uses strings for 'unknown' chunks and a macro, 788 * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice 789 * that for portable code numeric values must still be used; the string "IHDR" 790 * is not portable and neither is PNG_U32('I', 'H', 'D', 'R'). 791 * 792 * In 1.7.0 the definitions will be made public in png.h to avoid having to 793 * duplicate the same definitions in application code. 794 */ 795 #define png_IDAT PNG_U32( 73, 68, 65, 84) 796 #define png_IEND PNG_U32( 73, 69, 78, 68) 797 #define png_IHDR PNG_U32( 73, 72, 68, 82) 798 #define png_PLTE PNG_U32( 80, 76, 84, 69) 799 #define png_bKGD PNG_U32( 98, 75, 71, 68) 800 #define png_cHRM PNG_U32( 99, 72, 82, 77) 801 #define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */ 802 #define png_gAMA PNG_U32(103, 65, 77, 65) 803 #define png_gIFg PNG_U32(103, 73, 70, 103) 804 #define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */ 805 #define png_gIFx PNG_U32(103, 73, 70, 120) 806 #define png_hIST PNG_U32(104, 73, 83, 84) 807 #define png_iCCP PNG_U32(105, 67, 67, 80) 808 #define png_iTXt PNG_U32(105, 84, 88, 116) 809 #define png_oFFs PNG_U32(111, 70, 70, 115) 810 #define png_pCAL PNG_U32(112, 67, 65, 76) 811 #define png_pHYs PNG_U32(112, 72, 89, 115) 812 #define png_sBIT PNG_U32(115, 66, 73, 84) 813 #define png_sCAL PNG_U32(115, 67, 65, 76) 814 #define png_sPLT PNG_U32(115, 80, 76, 84) 815 #define png_sRGB PNG_U32(115, 82, 71, 66) 816 #define png_sTER PNG_U32(115, 84, 69, 82) 817 #define png_tEXt PNG_U32(116, 69, 88, 116) 818 #define png_tIME PNG_U32(116, 73, 77, 69) 819 #define png_tRNS PNG_U32(116, 82, 78, 83) 820 #define png_zTXt PNG_U32(122, 84, 88, 116) 821 822 /* The following will work on (signed char*) strings, whereas the get_uint_32 823 * macro will fail on top-bit-set values because of the sign extension. 824 */ 825 #define PNG_CHUNK_FROM_STRING(s)\ 826 PNG_U32(0xff & (s)[0], 0xff & (s)[1], 0xff & (s)[2], 0xff & (s)[3]) 827 828 /* This uses (char), not (png_byte) to avoid warnings on systems where (char) is 829 * signed and the argument is a (char[]) This macro will fail miserably on 830 * systems where (char) is more than 8 bits. 831 */ 832 #define PNG_STRING_FROM_CHUNK(s,c)\ 833 (void)(((char*)(s))[0]=(char)(((c)>>24) & 0xff), \ 834 ((char*)(s))[1]=(char)(((c)>>16) & 0xff),\ 835 ((char*)(s))[2]=(char)(((c)>>8) & 0xff), \ 836 ((char*)(s))[3]=(char)((c & 0xff))) 837 838 /* Do the same but terminate with a null character. */ 839 #define PNG_CSTRING_FROM_CHUNK(s,c)\ 840 (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0) 841 842 /* Test on flag values as defined in the spec (section 5.4): */ 843 #define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29)) 844 #define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c)) 845 #define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21)) 846 #define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13)) 847 #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5)) 848 849 /* Gamma values (new at libpng-1.5.4): */ 850 #define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */ 851 #define PNG_GAMMA_MAC_INVERSE 65909 852 #define PNG_GAMMA_sRGB_INVERSE 45455 853 854 /* Almost everything below is C specific; the #defines above can be used in 855 * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot. 856 */ 857 #ifndef PNG_VERSION_INFO_ONLY 858 859 #include "pngstruct.h" 860 #include "pnginfo.h" 861 862 /* Validate the include paths - the include path used to generate pnglibconf.h 863 * must match that used in the build, or we must be using pnglibconf.h.prebuilt: 864 */ 865 #if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM 866 # error ZLIB_VERNUM != PNG_ZLIB_VERNUM \ 867 "-I (include path) error: see the notes in pngpriv.h" 868 /* This means that when pnglibconf.h was built the copy of zlib.h that it 869 * used is not the same as the one being used here. Because the build of 870 * libpng makes decisions to use inflateInit2 and inflateReset2 based on the 871 * zlib version number and because this affects handling of certain broken 872 * PNG files the -I directives must match. 873 * 874 * The most likely explanation is that you passed a -I in CFLAGS. This will 875 * not work; all the preprocessor directories and in particular all the -I 876 * directives must be in CPPFLAGS. 877 */ 878 #endif 879 880 /* This is used for 16-bit gamma tables -- only the top level pointers are 881 * const; this could be changed: 882 */ 883 typedef const png_uint_16p * png_const_uint_16pp; 884 885 /* Added to libpng-1.5.7: sRGB conversion tables */ 886 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 887 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 888 #ifdef PNG_SIMPLIFIED_READ_SUPPORTED 889 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]); 890 /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value, 891 * 0..65535. This table gives the closest 16-bit answers (no errors). 892 */ 893 #endif 894 895 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]); 896 PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]); 897 898 #define PNG_sRGB_FROM_LINEAR(linear) \ 899 ((png_byte)(0xff & ((png_sRGB_base[(linear)>>15] \ 900 + ((((linear) & 0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8))) 901 /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB 902 * encoded value with maximum error 0.646365. Note that the input is not a 903 * 16-bit value; it has been multiplied by 255! */ 904 #endif /* SIMPLIFIED_READ/WRITE */ 905 906 907 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 908 #ifdef __cplusplus 909 extern "C" { 910 #endif /* __cplusplus */ 911 912 /* Internal functions; these are not exported from a DLL however because they 913 * are used within several of the C source files they have to be C extern. 914 * 915 * All of these functions must be declared with PNG_INTERNAL_FUNCTION. 916 */ 917 918 /* Zlib support */ 919 #define PNG_UNEXPECTED_ZLIB_RETURN (-7) 920 PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret), 921 PNG_EMPTY); 922 /* Used by the zlib handling functions to ensure that z_stream::msg is always 923 * set before they return. 924 */ 925 926 #ifdef PNG_WRITE_SUPPORTED 927 PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr, 928 png_compression_bufferp *list),PNG_EMPTY); 929 /* Free the buffer list used by the compressed write code. */ 930 #endif 931 932 #if defined(PNG_FLOATING_POINT_SUPPORTED) && \ 933 !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \ 934 (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \ 935 defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \ 936 defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \ 937 (defined(PNG_sCAL_SUPPORTED) && \ 938 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)) 939 PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr, 940 double fp, png_const_charp text),PNG_EMPTY); 941 #endif 942 943 /* Check the user version string for compatibility, returns false if the version 944 * numbers aren't compatible. 945 */ 946 PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr, 947 png_const_charp user_png_ver),PNG_EMPTY); 948 949 /* Internal base allocator - no messages, NULL on failure to allocate. This 950 * does, however, call the application provided allocator and that could call 951 * png_error (although that would be a bug in the application implementation.) 952 */ 953 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr, 954 png_alloc_size_t size),PNG_ALLOCATED); 955 956 #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\ 957 defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED) 958 /* Internal array allocator, outputs no error or warning messages on failure, 959 * just returns NULL. 960 */ 961 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr, 962 int nelements, size_t element_size),PNG_ALLOCATED); 963 964 /* The same but an existing array is extended by add_elements. This function 965 * also memsets the new elements to 0 and copies the old elements. The old 966 * array is not freed or altered. 967 */ 968 PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr, 969 png_const_voidp array, int old_elements, int add_elements, 970 size_t element_size),PNG_ALLOCATED); 971 #endif /* text, sPLT or unknown chunks */ 972 973 /* Magic to create a struct when there is no struct to call the user supplied 974 * memory allocators. Because error handling has not been set up the memory 975 * handlers can't safely call png_error, but this is an obscure and undocumented 976 * restriction so libpng has to assume that the 'free' handler, at least, might 977 * call png_error. 978 */ 979 PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct, 980 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, 981 png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, 982 png_free_ptr free_fn),PNG_ALLOCATED); 983 984 /* Free memory from internal libpng struct */ 985 PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr), 986 PNG_EMPTY); 987 988 /* Free an allocated jmp_buf (always succeeds) */ 989 PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY); 990 991 /* Function to allocate memory for zlib. PNGAPI is disallowed. */ 992 PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size), 993 PNG_ALLOCATED); 994 995 /* Function to free memory for zlib. PNGAPI is disallowed. */ 996 PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY); 997 998 /* Next four functions are used internally as callbacks. PNGCBAPI is required 999 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to 1000 * PNGCBAPI at 1.5.0 1001 */ 1002 1003 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr, 1004 png_bytep data, png_size_t length),PNG_EMPTY); 1005 1006 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1007 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr, 1008 png_bytep buffer, png_size_t length),PNG_EMPTY); 1009 #endif 1010 1011 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr, 1012 png_bytep data, png_size_t length),PNG_EMPTY); 1013 1014 #ifdef PNG_WRITE_FLUSH_SUPPORTED 1015 # ifdef PNG_STDIO_SUPPORTED 1016 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr), 1017 PNG_EMPTY); 1018 # endif 1019 #endif 1020 1021 /* Reset the CRC variable */ 1022 PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY); 1023 1024 /* Write the "data" buffer to whatever output you are using */ 1025 PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr, 1026 png_const_bytep data, png_size_t length),PNG_EMPTY); 1027 1028 /* Read and check the PNG file signature */ 1029 PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr, 1030 png_inforp info_ptr),PNG_EMPTY); 1031 1032 /* Read the chunk header (length + type name) */ 1033 PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr), 1034 PNG_EMPTY); 1035 1036 /* Read data from whatever input you are using into the "data" buffer */ 1037 PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data, 1038 png_size_t length),PNG_EMPTY); 1039 1040 /* Read bytes into buf, and update png_ptr->crc */ 1041 PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf, 1042 png_uint_32 length),PNG_EMPTY); 1043 1044 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 1045 PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr, 1046 png_uint_32 skip),PNG_EMPTY); 1047 1048 /* Read the CRC from the file and compare it to the libpng calculated CRC */ 1049 PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY); 1050 1051 /* Calculate the CRC over a section of data. Note that we are only 1052 * passing a maximum of 64K on systems that have this as a memory limit, 1053 * since this is the maximum buffer size we can specify. 1054 */ 1055 PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr, 1056 png_const_bytep ptr, png_size_t length),PNG_EMPTY); 1057 1058 #ifdef PNG_WRITE_FLUSH_SUPPORTED 1059 PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY); 1060 #endif 1061 1062 /* Write various chunks */ 1063 1064 /* Write the IHDR chunk, and update the png_struct with the necessary 1065 * information. 1066 */ 1067 PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr, 1068 png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, 1069 int compression_method, int filter_method, int interlace_method),PNG_EMPTY); 1070 1071 PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr, 1072 png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY); 1073 1074 PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr, 1075 png_const_bytep row_data, png_alloc_size_t row_data_length, int flush), 1076 PNG_EMPTY); 1077 1078 PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY); 1079 1080 #ifdef PNG_WRITE_gAMA_SUPPORTED 1081 PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr, 1082 png_fixed_point file_gamma),PNG_EMPTY); 1083 #endif 1084 1085 #ifdef PNG_WRITE_sBIT_SUPPORTED 1086 PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr, 1087 png_const_color_8p sbit, int color_type),PNG_EMPTY); 1088 #endif 1089 1090 #ifdef PNG_WRITE_cHRM_SUPPORTED 1091 PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr, 1092 const png_xy *xy), PNG_EMPTY); 1093 /* The xy value must have been previously validated */ 1094 #endif 1095 1096 #ifdef PNG_WRITE_sRGB_SUPPORTED 1097 PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr, 1098 int intent),PNG_EMPTY); 1099 #endif 1100 1101 #ifdef PNG_WRITE_iCCP_SUPPORTED 1102 PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr, 1103 png_const_charp name, png_const_bytep profile), PNG_EMPTY); 1104 /* The profile must have been previously validated for correctness, the 1105 * length comes from the first four bytes. Only the base, deflate, 1106 * compression is supported. 1107 */ 1108 #endif 1109 1110 #ifdef PNG_WRITE_sPLT_SUPPORTED 1111 PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr, 1112 png_const_sPLT_tp palette),PNG_EMPTY); 1113 #endif 1114 1115 #ifdef PNG_WRITE_tRNS_SUPPORTED 1116 PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr, 1117 png_const_bytep trans, png_const_color_16p values, int number, 1118 int color_type),PNG_EMPTY); 1119 #endif 1120 1121 #ifdef PNG_WRITE_bKGD_SUPPORTED 1122 PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr, 1123 png_const_color_16p values, int color_type),PNG_EMPTY); 1124 #endif 1125 1126 #ifdef PNG_WRITE_hIST_SUPPORTED 1127 PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr, 1128 png_const_uint_16p hist, int num_hist),PNG_EMPTY); 1129 #endif 1130 1131 /* Chunks that have keywords */ 1132 #ifdef PNG_WRITE_tEXt_SUPPORTED 1133 PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr, 1134 png_const_charp key, png_const_charp text, png_size_t text_len),PNG_EMPTY); 1135 #endif 1136 1137 #ifdef PNG_WRITE_zTXt_SUPPORTED 1138 PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp 1139 key, png_const_charp text, int compression),PNG_EMPTY); 1140 #endif 1141 1142 #ifdef PNG_WRITE_iTXt_SUPPORTED 1143 PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr, 1144 int compression, png_const_charp key, png_const_charp lang, 1145 png_const_charp lang_key, png_const_charp text),PNG_EMPTY); 1146 #endif 1147 1148 #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ 1149 PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr, 1150 png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY); 1151 #endif 1152 1153 #ifdef PNG_WRITE_oFFs_SUPPORTED 1154 PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr, 1155 png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY); 1156 #endif 1157 1158 #ifdef PNG_WRITE_pCAL_SUPPORTED 1159 PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr, 1160 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, 1161 png_const_charp units, png_charpp params),PNG_EMPTY); 1162 #endif 1163 1164 #ifdef PNG_WRITE_pHYs_SUPPORTED 1165 PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr, 1166 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 1167 int unit_type),PNG_EMPTY); 1168 #endif 1169 1170 #ifdef PNG_WRITE_tIME_SUPPORTED 1171 PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr, 1172 png_const_timep mod_time),PNG_EMPTY); 1173 #endif 1174 1175 #ifdef PNG_WRITE_sCAL_SUPPORTED 1176 PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr, 1177 int unit, png_const_charp width, png_const_charp height),PNG_EMPTY); 1178 #endif 1179 1180 /* Called when finished processing a row of data */ 1181 PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr), 1182 PNG_EMPTY); 1183 1184 /* Internal use only. Called before first row of data */ 1185 PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr), 1186 PNG_EMPTY); 1187 1188 /* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an 1189 * array of png_ptr->width pixels. If the image is not interlaced or this 1190 * is the final pass this just does a memcpy, otherwise the "display" flag 1191 * is used to determine whether to copy pixels that are not in the current pass. 1192 * 1193 * Because 'png_do_read_interlace' (below) replicates pixels this allows this 1194 * function to achieve the documented 'blocky' appearance during interlaced read 1195 * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row' 1196 * are not changed if they are not in the current pass, when display is 0. 1197 * 1198 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless. 1199 * 1200 * The API always reads from the png_struct row buffer and always assumes that 1201 * it is full width (png_do_read_interlace has already been called.) 1202 * 1203 * This function is only ever used to write to row buffers provided by the 1204 * caller of the relevant libpng API and the row must have already been 1205 * transformed by the read transformations. 1206 * 1207 * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed 1208 * bitmasks for use within the code, otherwise runtime generated masks are used. 1209 * The default is compile time masks. 1210 */ 1211 #ifndef PNG_USE_COMPILE_TIME_MASKS 1212 # define PNG_USE_COMPILE_TIME_MASKS 1 1213 #endif 1214 PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr, 1215 png_bytep row, int display),PNG_EMPTY); 1216 1217 #ifdef PNG_READ_INTERLACING_SUPPORTED 1218 /* Expand an interlaced row: the 'row_info' describes the pass data that has 1219 * been read in and must correspond to the pixels in 'row', the pixels are 1220 * expanded (moved apart) in 'row' to match the final layout, when doing this 1221 * the pixels are *replicated* to the intervening space. This is essential for 1222 * the correct operation of png_combine_row, above. 1223 */ 1224 PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info, 1225 png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY); 1226 #endif 1227 1228 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 1229 1230 #ifdef PNG_WRITE_INTERLACING_SUPPORTED 1231 /* Grab pixels out of a row for an interlaced pass */ 1232 PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info, 1233 png_bytep row, int pass),PNG_EMPTY); 1234 #endif 1235 1236 /* Unfilter a row: check the filter value before calling this, there is no point 1237 * calling it for PNG_FILTER_VALUE_NONE. 1238 */ 1239 PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop 1240 row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY); 1241 1242 #if PNG_ARM_NEON_OPT > 0 1243 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info, 1244 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1245 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop 1246 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1247 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop 1248 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1249 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop 1250 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1251 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop 1252 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1253 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop 1254 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1255 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop 1256 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1257 #endif 1258 1259 #if PNG_MIPS_MSA_OPT > 0 1260 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_msa,(png_row_infop row_info, 1261 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1262 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_msa,(png_row_infop 1263 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1264 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_msa,(png_row_infop 1265 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1266 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_msa,(png_row_infop 1267 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1268 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_msa,(png_row_infop 1269 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1270 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_msa,(png_row_infop 1271 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1272 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_msa,(png_row_infop 1273 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1274 #endif 1275 1276 #if PNG_INTEL_SSE_IMPLEMENTATION > 0 1277 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_sse2,(png_row_infop 1278 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1279 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_sse2,(png_row_infop 1280 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1281 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_sse2,(png_row_infop 1282 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1283 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_sse2,(png_row_infop 1284 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1285 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_sse2,(png_row_infop 1286 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1287 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_sse2,(png_row_infop 1288 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1289 #endif 1290 1291 /* Choose the best filter to use and filter the row data */ 1292 PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr, 1293 png_row_infop row_info),PNG_EMPTY); 1294 1295 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED 1296 PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr, 1297 png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY); 1298 /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer 1299 * is NULL the function checks, instead, for the end of the stream. In this 1300 * case a benign error will be issued if the stream end is not found or if 1301 * extra data has to be consumed. 1302 */ 1303 PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr), 1304 PNG_EMPTY); 1305 /* This cleans up when the IDAT LZ stream does not end when the last image 1306 * byte is read; there is still some pending input. 1307 */ 1308 1309 PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr), 1310 PNG_EMPTY); 1311 /* Finish a row while reading, dealing with interlacing passes, etc. */ 1312 #endif /* SEQUENTIAL_READ */ 1313 1314 /* Initialize the row buffers, etc. */ 1315 PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY); 1316 1317 #if PNG_ZLIB_VERNUM >= 0x1240 1318 PNG_INTERNAL_FUNCTION(int,png_zlib_inflate,(png_structrp png_ptr, int flush), 1319 PNG_EMPTY); 1320 # define PNG_INFLATE(pp, flush) png_zlib_inflate(pp, flush) 1321 #else /* Zlib < 1.2.4 */ 1322 # define PNG_INFLATE(pp, flush) inflate(&(pp)->zstream, flush) 1323 #endif /* Zlib < 1.2.4 */ 1324 1325 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1326 /* Optional call to update the users info structure */ 1327 PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr, 1328 png_inforp info_ptr),PNG_EMPTY); 1329 #endif 1330 1331 /* Shared transform functions, defined in pngtran.c */ 1332 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 1333 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 1334 PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info, 1335 png_bytep row, int at_start),PNG_EMPTY); 1336 #endif 1337 1338 #ifdef PNG_16BIT_SUPPORTED 1339 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 1340 PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info, 1341 png_bytep row),PNG_EMPTY); 1342 #endif 1343 #endif 1344 1345 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ 1346 defined(PNG_WRITE_PACKSWAP_SUPPORTED) 1347 PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info, 1348 png_bytep row),PNG_EMPTY); 1349 #endif 1350 1351 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 1352 PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info, 1353 png_bytep row),PNG_EMPTY); 1354 #endif 1355 1356 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1357 PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info, 1358 png_bytep row),PNG_EMPTY); 1359 #endif 1360 1361 /* The following decodes the appropriate chunks, and does error correction, 1362 * then calls the appropriate callback for the chunk if it is valid. 1363 */ 1364 1365 /* Decode the IHDR chunk */ 1366 PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr, 1367 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1368 PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr, 1369 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1370 PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr, 1371 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1372 1373 #ifdef PNG_READ_bKGD_SUPPORTED 1374 PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr, 1375 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1376 #endif 1377 1378 #ifdef PNG_READ_cHRM_SUPPORTED 1379 PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr, 1380 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1381 #endif 1382 1383 #ifdef PNG_READ_gAMA_SUPPORTED 1384 PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr, 1385 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1386 #endif 1387 1388 #ifdef PNG_READ_hIST_SUPPORTED 1389 PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr, 1390 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1391 #endif 1392 1393 #ifdef PNG_READ_iCCP_SUPPORTED 1394 PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr, 1395 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1396 #endif /* READ_iCCP */ 1397 1398 #ifdef PNG_READ_iTXt_SUPPORTED 1399 PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr, 1400 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1401 #endif 1402 1403 #ifdef PNG_READ_oFFs_SUPPORTED 1404 PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr, 1405 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1406 #endif 1407 1408 #ifdef PNG_READ_pCAL_SUPPORTED 1409 PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr, 1410 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1411 #endif 1412 1413 #ifdef PNG_READ_pHYs_SUPPORTED 1414 PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr, 1415 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1416 #endif 1417 1418 #ifdef PNG_READ_sBIT_SUPPORTED 1419 PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr, 1420 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1421 #endif 1422 1423 #ifdef PNG_READ_sCAL_SUPPORTED 1424 PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr, 1425 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1426 #endif 1427 1428 #ifdef PNG_READ_sPLT_SUPPORTED 1429 PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr, 1430 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1431 #endif /* READ_sPLT */ 1432 1433 #ifdef PNG_READ_sRGB_SUPPORTED 1434 PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr, 1435 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1436 #endif 1437 1438 #ifdef PNG_READ_tEXt_SUPPORTED 1439 PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr, 1440 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1441 #endif 1442 1443 #ifdef PNG_READ_tIME_SUPPORTED 1444 PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr, 1445 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1446 #endif 1447 1448 #ifdef PNG_READ_tRNS_SUPPORTED 1449 PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr, 1450 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1451 #endif 1452 1453 #ifdef PNG_READ_zTXt_SUPPORTED 1454 PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr, 1455 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1456 #endif 1457 1458 PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_structrp png_ptr, 1459 png_uint_32 chunk_name),PNG_EMPTY); 1460 1461 PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr, 1462 png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY); 1463 /* This is the function that gets called for unknown chunks. The 'keep' 1464 * argument is either non-zero for a known chunk that has been set to be 1465 * handled as unknown or zero for an unknown chunk. By default the function 1466 * just skips the chunk or errors out if it is critical. 1467 */ 1468 1469 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\ 1470 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 1471 PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling, 1472 (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY); 1473 /* Exactly as the API png_handle_as_unknown() except that the argument is a 1474 * 32-bit chunk name, not a string. 1475 */ 1476 #endif /* READ_UNKNOWN_CHUNKS || HANDLE_AS_UNKNOWN */ 1477 1478 /* Handle the transformations for reading and writing */ 1479 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1480 PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr, 1481 png_row_infop row_info),PNG_EMPTY); 1482 #endif 1483 #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED 1484 PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr, 1485 png_row_infop row_info),PNG_EMPTY); 1486 #endif 1487 1488 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1489 PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr), 1490 PNG_EMPTY); 1491 #endif 1492 1493 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1494 PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr, 1495 png_inforp info_ptr),PNG_EMPTY); 1496 PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr, 1497 png_inforp info_ptr),PNG_EMPTY); 1498 PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY); 1499 PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr), 1500 PNG_EMPTY); 1501 PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr, 1502 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); 1503 PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY); 1504 PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr, 1505 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); 1506 PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr), 1507 PNG_EMPTY); 1508 PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr, 1509 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1510 PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr, 1511 png_inforp info_ptr),PNG_EMPTY); 1512 PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr, 1513 png_inforp info_ptr),PNG_EMPTY); 1514 PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr, 1515 png_bytep row),PNG_EMPTY); 1516 PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr, 1517 png_inforp info_ptr),PNG_EMPTY); 1518 PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr, 1519 png_inforp info_ptr),PNG_EMPTY); 1520 PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr), 1521 PNG_EMPTY); 1522 # ifdef PNG_READ_tEXt_SUPPORTED 1523 PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr, 1524 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1525 PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr, 1526 png_inforp info_ptr),PNG_EMPTY); 1527 # endif 1528 # ifdef PNG_READ_zTXt_SUPPORTED 1529 PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr, 1530 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1531 PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr, 1532 png_inforp info_ptr),PNG_EMPTY); 1533 # endif 1534 # ifdef PNG_READ_iTXt_SUPPORTED 1535 PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr, 1536 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1537 PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr, 1538 png_inforp info_ptr),PNG_EMPTY); 1539 # endif 1540 1541 #endif /* PROGRESSIVE_READ */ 1542 1543 /* Added at libpng version 1.6.0 */ 1544 #ifdef PNG_GAMMA_SUPPORTED 1545 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr, 1546 png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY); 1547 /* Set the colorspace gamma with a value provided by the application or by 1548 * the gAMA chunk on read. The value will override anything set by an ICC 1549 * profile. 1550 */ 1551 1552 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr, 1553 png_inforp info_ptr), PNG_EMPTY); 1554 /* Synchronize the info 'valid' flags with the colorspace */ 1555 1556 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr, 1557 png_inforp info_ptr), PNG_EMPTY); 1558 /* Copy the png_struct colorspace to the info_struct and call the above to 1559 * synchronize the flags. Checks for NULL info_ptr and does nothing. 1560 */ 1561 #endif 1562 1563 /* Added at libpng version 1.4.0 */ 1564 #ifdef PNG_COLORSPACE_SUPPORTED 1565 /* These internal functions are for maintaining the colorspace structure within 1566 * a png_info or png_struct (or, indeed, both). 1567 */ 1568 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities, 1569 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy, 1570 int preferred), PNG_EMPTY); 1571 1572 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints, 1573 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ, 1574 int preferred), PNG_EMPTY); 1575 1576 #ifdef PNG_sRGB_SUPPORTED 1577 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr, 1578 png_colorspacerp colorspace, int intent), PNG_EMPTY); 1579 /* This does set the colorspace gAMA and cHRM values too, but doesn't set the 1580 * flags to write them, if it returns false there was a problem and an error 1581 * message has already been output (but the colorspace may still need to be 1582 * synced to record the invalid flag). 1583 */ 1584 #endif /* sRGB */ 1585 1586 #ifdef PNG_iCCP_SUPPORTED 1587 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr, 1588 png_colorspacerp colorspace, png_const_charp name, 1589 png_uint_32 profile_length, png_const_bytep profile, int color_type), 1590 PNG_EMPTY); 1591 /* The 'name' is used for information only */ 1592 1593 /* Routines for checking parts of an ICC profile. */ 1594 #ifdef PNG_READ_iCCP_SUPPORTED 1595 PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr, 1596 png_colorspacerp colorspace, png_const_charp name, 1597 png_uint_32 profile_length), PNG_EMPTY); 1598 #endif /* READ_iCCP */ 1599 PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr, 1600 png_colorspacerp colorspace, png_const_charp name, 1601 png_uint_32 profile_length, 1602 png_const_bytep profile /* first 132 bytes only */, int color_type), 1603 PNG_EMPTY); 1604 PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr, 1605 png_colorspacerp colorspace, png_const_charp name, 1606 png_uint_32 profile_length, 1607 png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY); 1608 #ifdef PNG_sRGB_SUPPORTED 1609 PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,( 1610 png_const_structrp png_ptr, png_colorspacerp colorspace, 1611 png_const_bytep profile, uLong adler), PNG_EMPTY); 1612 /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may 1613 * be zero to indicate that it is not available. It is used, if provided, 1614 * as a fast check on the profile when checking to see if it is sRGB. 1615 */ 1616 #endif 1617 #endif /* iCCP */ 1618 1619 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1620 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients, 1621 (png_structrp png_ptr), PNG_EMPTY); 1622 /* Set the rgb_to_gray coefficients from the colorspace Y values */ 1623 #endif /* READ_RGB_TO_GRAY */ 1624 #endif /* COLORSPACE */ 1625 1626 /* Added at libpng version 1.4.0 */ 1627 PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr, 1628 png_uint_32 width, png_uint_32 height, int bit_depth, 1629 int color_type, int interlace_type, int compression_type, 1630 int filter_type),PNG_EMPTY); 1631 1632 /* Added at libpng version 1.5.10 */ 1633 #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \ 1634 defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED) 1635 PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes, 1636 (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY); 1637 #endif 1638 1639 #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) 1640 PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr, 1641 png_const_charp name),PNG_NORETURN); 1642 #endif 1643 1644 /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite 1645 * the end. Always leaves the buffer nul terminated. Never errors out (and 1646 * there is no error code.) 1647 */ 1648 PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize, 1649 size_t pos, png_const_charp string),PNG_EMPTY); 1650 1651 /* Various internal functions to handle formatted warning messages, currently 1652 * only implemented for warnings. 1653 */ 1654 #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) 1655 /* Utility to dump an unsigned value into a buffer, given a start pointer and 1656 * and end pointer (which should point just *beyond* the end of the buffer!) 1657 * Returns the pointer to the start of the formatted string. This utility only 1658 * does unsigned values. 1659 */ 1660 PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start, 1661 png_charp end, int format, png_alloc_size_t number),PNG_EMPTY); 1662 1663 /* Convenience macro that takes an array: */ 1664 #define PNG_FORMAT_NUMBER(buffer,format,number) \ 1665 png_format_number(buffer, buffer + (sizeof buffer), format, number) 1666 1667 /* Suggested size for a number buffer (enough for 64 bits and a sign!) */ 1668 #define PNG_NUMBER_BUFFER_SIZE 24 1669 1670 /* These are the integer formats currently supported, the name is formed from 1671 * the standard printf(3) format string. 1672 */ 1673 #define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */ 1674 #define PNG_NUMBER_FORMAT_02u 2 1675 #define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */ 1676 #define PNG_NUMBER_FORMAT_02d 2 1677 #define PNG_NUMBER_FORMAT_x 3 1678 #define PNG_NUMBER_FORMAT_02x 4 1679 #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */ 1680 #endif 1681 1682 #ifdef PNG_WARNINGS_SUPPORTED 1683 /* New defines and members adding in libpng-1.5.4 */ 1684 # define PNG_WARNING_PARAMETER_SIZE 32 1685 # define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */ 1686 1687 /* An l-value of this type has to be passed to the APIs below to cache the 1688 * values of the parameters to a formatted warning message. 1689 */ 1690 typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][ 1691 PNG_WARNING_PARAMETER_SIZE]; 1692 1693 PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p, 1694 int number, png_const_charp string),PNG_EMPTY); 1695 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters, 1696 * including the trailing '\0'. 1697 */ 1698 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned, 1699 (png_warning_parameters p, int number, int format, png_alloc_size_t value), 1700 PNG_EMPTY); 1701 /* Use png_alloc_size_t because it is an unsigned type as big as any we 1702 * need to output. Use the following for a signed value. 1703 */ 1704 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed, 1705 (png_warning_parameters p, int number, int format, png_int_32 value), 1706 PNG_EMPTY); 1707 1708 PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr, 1709 png_warning_parameters p, png_const_charp message),PNG_EMPTY); 1710 /* 'message' follows the X/Open approach of using @1, @2 to insert 1711 * parameters previously supplied using the above functions. Errors in 1712 * specifying the parameters will simply result in garbage substitutions. 1713 */ 1714 #endif 1715 1716 #ifdef PNG_BENIGN_ERRORS_SUPPORTED 1717 /* Application errors (new in 1.6); use these functions (declared below) for 1718 * errors in the parameters or order of API function calls on read. The 1719 * 'warning' should be used for an error that can be handled completely; the 1720 * 'error' for one which can be handled safely but which may lose application 1721 * information or settings. 1722 * 1723 * By default these both result in a png_error call prior to release, while in a 1724 * released version the 'warning' is just a warning. However if the application 1725 * explicitly disables benign errors (explicitly permitting the code to lose 1726 * information) they both turn into warnings. 1727 * 1728 * If benign errors aren't supported they end up as the corresponding base call 1729 * (png_warning or png_error.) 1730 */ 1731 PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr, 1732 png_const_charp message),PNG_EMPTY); 1733 /* The application provided invalid parameters to an API function or called 1734 * an API function at the wrong time, libpng can completely recover. 1735 */ 1736 1737 PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr, 1738 png_const_charp message),PNG_EMPTY); 1739 /* As above but libpng will ignore the call, or attempt some other partial 1740 * recovery from the error. 1741 */ 1742 #else 1743 # define png_app_warning(pp,s) png_warning(pp,s) 1744 # define png_app_error(pp,s) png_error(pp,s) 1745 #endif 1746 1747 PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr, 1748 png_const_charp message, int error),PNG_EMPTY); 1749 /* Report a recoverable issue in chunk data. On read this is used to report 1750 * a problem found while reading a particular chunk and the 1751 * png_chunk_benign_error or png_chunk_warning function is used as 1752 * appropriate. On write this is used to report an error that comes from 1753 * data set via an application call to a png_set_ API and png_app_error or 1754 * png_app_warning is used as appropriate. 1755 * 1756 * The 'error' parameter must have one of the following values: 1757 */ 1758 #define PNG_CHUNK_WARNING 0 /* never an error */ 1759 #define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */ 1760 #define PNG_CHUNK_ERROR 2 /* always an error */ 1761 1762 /* ASCII to FP interfaces, currently only implemented if sCAL 1763 * support is required. 1764 */ 1765 #if defined(PNG_sCAL_SUPPORTED) 1766 /* MAX_DIGITS is actually the maximum number of characters in an sCAL 1767 * width or height, derived from the precision (number of significant 1768 * digits - a build time settable option) and assumptions about the 1769 * maximum ridiculous exponent. 1770 */ 1771 #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/) 1772 1773 #ifdef PNG_FLOATING_POINT_SUPPORTED 1774 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr, 1775 png_charp ascii, png_size_t size, double fp, unsigned int precision), 1776 PNG_EMPTY); 1777 #endif /* FLOATING_POINT */ 1778 1779 #ifdef PNG_FIXED_POINT_SUPPORTED 1780 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr, 1781 png_charp ascii, png_size_t size, png_fixed_point fp),PNG_EMPTY); 1782 #endif /* FIXED_POINT */ 1783 #endif /* sCAL */ 1784 1785 #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) 1786 /* An internal API to validate the format of a floating point number. 1787 * The result is the index of the next character. If the number is 1788 * not valid it will be the index of a character in the supposed number. 1789 * 1790 * The format of a number is defined in the PNG extensions specification 1791 * and this API is strictly conformant to that spec, not anyone elses! 1792 * 1793 * The format as a regular expression is: 1794 * 1795 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)? 1796 * 1797 * or: 1798 * 1799 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)? 1800 * 1801 * The complexity is that either integer or fraction must be present and the 1802 * fraction is permitted to have no digits only if the integer is present. 1803 * 1804 * NOTE: The dangling E problem. 1805 * There is a PNG valid floating point number in the following: 1806 * 1807 * PNG floating point numbers are not greedy. 1808 * 1809 * Working this out requires *TWO* character lookahead (because of the 1810 * sign), the parser does not do this - it will fail at the 'r' - this 1811 * doesn't matter for PNG sCAL chunk values, but it requires more care 1812 * if the value were ever to be embedded in something more complex. Use 1813 * ANSI-C strtod if you need the lookahead. 1814 */ 1815 /* State table for the parser. */ 1816 #define PNG_FP_INTEGER 0 /* before or in integer */ 1817 #define PNG_FP_FRACTION 1 /* before or in fraction */ 1818 #define PNG_FP_EXPONENT 2 /* before or in exponent */ 1819 #define PNG_FP_STATE 3 /* mask for the above */ 1820 #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */ 1821 #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */ 1822 #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */ 1823 #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */ 1824 #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */ 1825 1826 /* These three values don't affect the parser. They are set but not used. 1827 */ 1828 #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */ 1829 #define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */ 1830 #define PNG_FP_NONZERO 256 /* A non-zero value */ 1831 #define PNG_FP_STICKY 448 /* The above three flags */ 1832 1833 /* This is available for the caller to store in 'state' if required. Do not 1834 * call the parser after setting it (the parser sometimes clears it.) 1835 */ 1836 #define PNG_FP_INVALID 512 /* Available for callers as a distinct value */ 1837 1838 /* Result codes for the parser (boolean - true meants ok, false means 1839 * not ok yet.) 1840 */ 1841 #define PNG_FP_MAYBE 0 /* The number may be valid in the future */ 1842 #define PNG_FP_OK 1 /* The number is valid */ 1843 1844 /* Tests on the sticky non-zero and negative flags. To pass these checks 1845 * the state must also indicate that the whole number is valid - this is 1846 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this 1847 * is equivalent to PNG_FP_OK above.) 1848 */ 1849 #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO) 1850 /* NZ_MASK: the string is valid and a non-zero negative value */ 1851 #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO) 1852 /* Z MASK: the string is valid and a non-zero value. */ 1853 /* PNG_FP_SAW_DIGIT: the string is valid. */ 1854 #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT) 1855 #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK) 1856 #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK) 1857 1858 /* The actual parser. This can be called repeatedly. It updates 1859 * the index into the string and the state variable (which must 1860 * be initialized to 0). It returns a result code, as above. There 1861 * is no point calling the parser any more if it fails to advance to 1862 * the end of the string - it is stuck on an invalid character (or 1863 * terminated by '\0'). 1864 * 1865 * Note that the pointer will consume an E or even an E+ and then leave 1866 * a 'maybe' state even though a preceding integer.fraction is valid. 1867 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was 1868 * a valid number. It's possible to recover from this by calling 1869 * the parser again (from the start, with state 0) but with a string 1870 * that omits the last character (i.e. set the size to the index of 1871 * the problem character.) This has not been tested within libpng. 1872 */ 1873 PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string, 1874 png_size_t size, int *statep, png_size_tp whereami),PNG_EMPTY); 1875 1876 /* This is the same but it checks a complete string and returns true 1877 * only if it just contains a floating point number. As of 1.5.4 this 1878 * function also returns the state at the end of parsing the number if 1879 * it was valid (otherwise it returns 0.) This can be used for testing 1880 * for negative or zero values using the sticky flag. 1881 */ 1882 PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string, 1883 png_size_t size),PNG_EMPTY); 1884 #endif /* pCAL || sCAL */ 1885 1886 #if defined(PNG_GAMMA_SUPPORTED) ||\ 1887 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED) 1888 /* Added at libpng version 1.5.0 */ 1889 /* This is a utility to provide a*times/div (rounded) and indicate 1890 * if there is an overflow. The result is a boolean - false (0) 1891 * for overflow, true (1) if no overflow, in which case *res 1892 * holds the result. 1893 */ 1894 PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a, 1895 png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY); 1896 #endif 1897 1898 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED) 1899 /* Same deal, but issue a warning on overflow and return 0. */ 1900 PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn, 1901 (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by, 1902 png_int_32 divided_by),PNG_EMPTY); 1903 #endif 1904 1905 #ifdef PNG_GAMMA_SUPPORTED 1906 /* Calculate a reciprocal - used for gamma values. This returns 1907 * 0 if the argument is 0 in order to maintain an undefined value; 1908 * there are no warnings. 1909 */ 1910 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a), 1911 PNG_EMPTY); 1912 1913 #ifdef PNG_READ_GAMMA_SUPPORTED 1914 /* The same but gives a reciprocal of the product of two fixed point 1915 * values. Accuracy is suitable for gamma calculations but this is 1916 * not exact - use png_muldiv for that. Only required at present on read. 1917 */ 1918 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a, 1919 png_fixed_point b),PNG_EMPTY); 1920 #endif 1921 1922 /* Return true if the gamma value is significantly different from 1.0 */ 1923 PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value), 1924 PNG_EMPTY); 1925 #endif 1926 1927 #ifdef PNG_READ_GAMMA_SUPPORTED 1928 /* Internal fixed point gamma correction. These APIs are called as 1929 * required to convert single values - they don't need to be fast, 1930 * they are not used when processing image pixel values. 1931 * 1932 * While the input is an 'unsigned' value it must actually be the 1933 * correct bit value - 0..255 or 0..65535 as required. 1934 */ 1935 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr, 1936 unsigned int value, png_fixed_point gamma_value),PNG_EMPTY); 1937 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value, 1938 png_fixed_point gamma_value),PNG_EMPTY); 1939 PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value, 1940 png_fixed_point gamma_value),PNG_EMPTY); 1941 PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr), 1942 PNG_EMPTY); 1943 PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr, 1944 int bit_depth),PNG_EMPTY); 1945 #endif 1946 1947 /* SIMPLIFIED READ/WRITE SUPPORT */ 1948 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 1949 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 1950 /* The internal structure that png_image::opaque points to. */ 1951 typedef struct png_control 1952 { 1953 png_structp png_ptr; 1954 png_infop info_ptr; 1955 png_voidp error_buf; /* Always a jmp_buf at present. */ 1956 1957 png_const_bytep memory; /* Memory buffer. */ 1958 png_size_t size; /* Size of the memory buffer. */ 1959 1960 unsigned int for_write :1; /* Otherwise it is a read structure */ 1961 unsigned int owned_file :1; /* We own the file in io_ptr */ 1962 } png_control; 1963 1964 /* Return the pointer to the jmp_buf from a png_control: necessary because C 1965 * does not reveal the type of the elements of jmp_buf. 1966 */ 1967 #ifdef __cplusplus 1968 # define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0]) 1969 #else 1970 # define png_control_jmp_buf(pc) ((pc)->error_buf) 1971 #endif 1972 1973 /* Utility to safely execute a piece of libpng code catching and logging any 1974 * errors that might occur. Returns true on success, false on failure (either 1975 * of the function or as a result of a png_error.) 1976 */ 1977 PNG_INTERNAL_CALLBACK(void,png_safe_error,(png_structp png_ptr, 1978 png_const_charp error_message),PNG_NORETURN); 1979 1980 #ifdef PNG_WARNINGS_SUPPORTED 1981 PNG_INTERNAL_CALLBACK(void,png_safe_warning,(png_structp png_ptr, 1982 png_const_charp warning_message),PNG_EMPTY); 1983 #else 1984 # define png_safe_warning 0/*dummy argument*/ 1985 #endif 1986 1987 PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image, 1988 int (*function)(png_voidp), png_voidp arg),PNG_EMPTY); 1989 1990 /* Utility to log an error; this also cleans up the png_image; the function 1991 * always returns 0 (false). 1992 */ 1993 PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image, 1994 png_const_charp error_message),PNG_EMPTY); 1995 1996 #ifndef PNG_SIMPLIFIED_READ_SUPPORTED 1997 /* png_image_free is used by the write code but not exported */ 1998 PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY); 1999 #endif /* !SIMPLIFIED_READ */ 2000 2001 #endif /* SIMPLIFIED READ/WRITE */ 2002 2003 /* These are initialization functions for hardware specific PNG filter 2004 * optimizations; list these here then select the appropriate one at compile 2005 * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined 2006 * the generic code is used. 2007 */ 2008 #ifdef PNG_FILTER_OPTIMIZATIONS 2009 PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr, 2010 unsigned int bpp), PNG_EMPTY); 2011 /* Just declare the optimization that will be used */ 2012 #else 2013 /* List *all* the possible optimizations here - this branch is required if 2014 * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in 2015 * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing. 2016 */ 2017 # if PNG_ARM_NEON_OPT > 0 2018 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon, 2019 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2020 #endif 2021 2022 #if PNG_MIPS_MSA_OPT > 0 2023 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_msa, 2024 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2025 #endif 2026 2027 # if PNG_INTEL_SSE_IMPLEMENTATION > 0 2028 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_sse2, 2029 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2030 # endif 2031 #endif 2032 2033 PNG_INTERNAL_FUNCTION(png_uint_32, png_check_keyword, (png_structrp png_ptr, 2034 png_const_charp key, png_bytep new_key), PNG_EMPTY); 2035 2036 /* Maintainer: Put new private prototypes here ^ */ 2037 2038 #include "pngdebug.h" 2039 2040 #ifdef __cplusplus 2041 } 2042 #endif 2043 2044 #endif /* PNG_VERSION_INFO_ONLY */ 2045 #endif /* PNGPRIV_H */ 2046
