1 /* 2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. Oracle designates this 7 * particular file as subject to the "Classpath" exception as provided 8 * by Oracle in the LICENSE file that accompanied this code. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 */ 24 25 /* pngpriv.h - private declarations for use inside libpng 26 * 27 * This file is available under and governed by the GNU General Public 28 * License version 2 only, as published by the Free Software Foundation. 29 * However, the following notice accompanied the original version of this 30 * file and, per its terms, should not be removed: 31 * 32 * Copyright (c) 2018-2019 Cosmin Truta 33 * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson 34 * Copyright (c) 1996-1997 Andreas Dilger 35 * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc. 36 * 37 * This code is released under the libpng license. 38 * For conditions of distribution and use, see the disclaimer 39 * and license in png.h 40 */ 41 42 /* The symbols declared in this file (including the functions declared 43 * as extern) are PRIVATE. They are not part of the libpng public 44 * interface, and are not recommended for use by regular applications. 45 * Some of them may become public in the future; others may stay private, 46 * change in an incompatible way, or even disappear. 47 * Although the libpng users are not forbidden to include this header, 48 * they should be well aware of the issues that may arise from doing so. 49 */ 50 51 #ifndef PNGPRIV_H 52 #define PNGPRIV_H 53 54 /* Feature Test Macros. The following are defined here to ensure that correctly 55 * implemented libraries reveal the APIs libpng needs to build and hide those 56 * that are not needed and potentially damaging to the compilation. 57 * 58 * Feature Test Macros must be defined before any system header is included (see 59 * POSIX 1003.1 2.8.2 "POSIX Symbols." 60 * 61 * These macros only have an effect if the operating system supports either 62 * POSIX 1003.1 or C99, or both. On other operating systems (particularly 63 * Windows/Visual Studio) there is no effect; the OS specific tests below are 64 * still required (as of 2011-05-02.) 65 */ 66 #ifndef _POSIX_SOURCE 67 # define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */ 68 #endif 69 70 #ifndef PNG_VERSION_INFO_ONLY 71 /* Standard library headers not required by png.h: */ 72 # include <stdlib.h> 73 # include <string.h> 74 #endif 75 76 #define PNGLIB_BUILD /*libpng is being built, not used*/ 77 78 /* If HAVE_CONFIG_H is defined during the build then the build system must 79 * provide an appropriate "config.h" file on the include path. The header file 80 * must provide definitions as required below (search for "HAVE_CONFIG_H"); 81 * see configure.ac for more details of the requirements. The macro 82 * "PNG_NO_CONFIG_H" is provided for maintainers to test for dependencies on 83 * 'configure'; define this macro to prevent the configure build including the 84 * configure generated config.h. Libpng is expected to compile without *any* 85 * special build system support on a reasonably ANSI-C compliant system. 86 */ 87 #if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H) 88 # include <config.h> 89 90 /* Pick up the definition of 'restrict' from config.h if it was read: */ 91 # define PNG_RESTRICT restrict 92 #endif 93 94 /* To support symbol prefixing it is necessary to know *before* including png.h 95 * whether the fixed point (and maybe other) APIs are exported, because if they 96 * are not internal definitions may be required. This is handled below just 97 * before png.h is included, but load the configuration now if it is available. 98 */ 99 #ifndef PNGLCONF_H 100 # include "pnglibconf.h" 101 #endif 102 103 /* Local renames may change non-exported API functions from png.h */ 104 #if defined(PNG_PREFIX) && !defined(PNGPREFIX_H) 105 # include "pngprefix.h" 106 #endif 107 108 #ifdef PNG_USER_CONFIG 109 # include "pngusr.h" 110 /* These should have been defined in pngusr.h */ 111 # ifndef PNG_USER_PRIVATEBUILD 112 # define PNG_USER_PRIVATEBUILD "Custom libpng build" 113 # endif 114 # ifndef PNG_USER_DLLFNAME_POSTFIX 115 # define PNG_USER_DLLFNAME_POSTFIX "Cb" 116 # endif 117 #endif 118 119 /* Compile time options. 120 * ===================== 121 * In a multi-arch build the compiler may compile the code several times for the 122 * same object module, producing different binaries for different architectures. 123 * When this happens configure-time setting of the target host options cannot be 124 * done and this interferes with the handling of the ARM NEON optimizations, and 125 * possibly other similar optimizations. Put additional tests here; in general 126 * this is needed when the same option can be changed at both compile time and 127 * run time depending on the target OS (i.e. iOS vs Android.) 128 * 129 * NOTE: symbol prefixing does not pass $(CFLAGS) to the preprocessor, because 130 * this is not possible with certain compilers (Oracle SUN OS CC), as a result 131 * it is necessary to ensure that all extern functions that *might* be used 132 * regardless of $(CFLAGS) get declared in this file. The test on __ARM_NEON__ 133 * below is one example of this behavior because it is controlled by the 134 * presence or not of -mfpu=neon on the GCC command line, it is possible to do 135 * this in $(CC), e.g. "CC=gcc -mfpu=neon", but people who build libpng rarely 136 * do this. 137 */ 138 #ifndef PNG_ARM_NEON_OPT 139 /* ARM NEON optimizations are being controlled by the compiler settings, 140 * typically the target FPU. If the FPU has been set to NEON (-mfpu=neon 141 * with GCC) then the compiler will define __ARM_NEON__ and we can rely 142 * unconditionally on NEON instructions not crashing, otherwise we must 143 * disable use of NEON instructions. 144 * 145 * NOTE: at present these optimizations depend on 'ALIGNED_MEMORY', so they 146 * can only be turned on automatically if that is supported too. If 147 * PNG_ARM_NEON_OPT is set in CPPFLAGS (to >0) then arm/arm_init.c will fail 148 * to compile with an appropriate #error if ALIGNED_MEMORY has been turned 149 * off. 150 * 151 * Note that gcc-4.9 defines __ARM_NEON instead of the deprecated 152 * __ARM_NEON__, so we check both variants. 153 * 154 * To disable ARM_NEON optimizations entirely, and skip compiling the 155 * associated assembler code, pass --enable-arm-neon=no to configure 156 * or put -DPNG_ARM_NEON_OPT=0 in CPPFLAGS. 157 */ 158 # if (defined(__ARM_NEON__) || defined(__ARM_NEON)) && \ 159 defined(PNG_ALIGNED_MEMORY_SUPPORTED) 160 # define PNG_ARM_NEON_OPT 2 161 # else 162 # define PNG_ARM_NEON_OPT 0 163 # endif 164 #endif 165 166 #if PNG_ARM_NEON_OPT > 0 167 /* NEON optimizations are to be at least considered by libpng, so enable the 168 * callbacks to do this. 169 */ 170 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_neon 171 172 /* By default the 'intrinsics' code in arm/filter_neon_intrinsics.c is used 173 * if possible - if __ARM_NEON__ is set and the compiler version is not known 174 * to be broken. This is controlled by PNG_ARM_NEON_IMPLEMENTATION which can 175 * be: 176 * 177 * 1 The intrinsics code (the default with __ARM_NEON__) 178 * 2 The hand coded assembler (the default without __ARM_NEON__) 179 * 180 * It is possible to set PNG_ARM_NEON_IMPLEMENTATION in CPPFLAGS, however 181 * this is *NOT* supported and may cease to work even after a minor revision 182 * to libpng. It *is* valid to do this for testing purposes, e.g. speed 183 * testing or a new compiler, but the results should be communicated to the 184 * libpng implementation list for incorporation in the next minor release. 185 */ 186 # ifndef PNG_ARM_NEON_IMPLEMENTATION 187 # if defined(__ARM_NEON__) || defined(__ARM_NEON) 188 # if defined(__clang__) 189 /* At present it is unknown by the libpng developers which versions 190 * of clang support the intrinsics, however some or perhaps all 191 * versions do not work with the assembler so this may be 192 * irrelevant, so just use the default (do nothing here.) 193 */ 194 # elif defined(__GNUC__) 195 /* GCC 4.5.4 NEON support is known to be broken. 4.6.3 is known to 196 * work, so if this *is* GCC, or G++, look for a version >4.5 197 */ 198 # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6) 199 # define PNG_ARM_NEON_IMPLEMENTATION 2 200 # endif /* no GNUC support */ 201 # endif /* __GNUC__ */ 202 # else /* !defined __ARM_NEON__ */ 203 /* The 'intrinsics' code simply won't compile without this -mfpu=neon: 204 */ 205 # if !defined(__aarch64__) 206 /* The assembler code currently does not work on ARM64 */ 207 # define PNG_ARM_NEON_IMPLEMENTATION 2 208 # endif /* __aarch64__ */ 209 # endif /* __ARM_NEON__ */ 210 # endif /* !PNG_ARM_NEON_IMPLEMENTATION */ 211 212 # ifndef PNG_ARM_NEON_IMPLEMENTATION 213 /* Use the intrinsics code by default. */ 214 # define PNG_ARM_NEON_IMPLEMENTATION 1 215 # endif 216 #endif /* PNG_ARM_NEON_OPT > 0 */ 217 218 #ifndef PNG_MIPS_MSA_OPT 219 # if defined(__mips_msa) && (__mips_isa_rev >= 5) && defined(PNG_ALIGNED_MEMORY_SUPPORTED) 220 # define PNG_MIPS_MSA_OPT 2 221 # else 222 # define PNG_MIPS_MSA_OPT 0 223 # endif 224 #endif 225 226 #ifndef PNG_POWERPC_VSX_OPT 227 # if defined(__PPC64__) && defined(__ALTIVEC__) && defined(__VSX__) 228 # define PNG_POWERPC_VSX_OPT 2 229 # else 230 # define PNG_POWERPC_VSX_OPT 0 231 # endif 232 #endif 233 234 #ifndef PNG_INTEL_SSE_OPT 235 # ifdef PNG_INTEL_SSE 236 /* Only check for SSE if the build configuration has been modified to 237 * enable SSE optimizations. This means that these optimizations will 238 * be off by default. See contrib/intel for more details. 239 */ 240 # if defined(__SSE4_1__) || defined(__AVX__) || defined(__SSSE3__) || \ 241 defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \ 242 (defined(_M_IX86_FP) && _M_IX86_FP >= 2) 243 # define PNG_INTEL_SSE_OPT 1 244 # else 245 # define PNG_INTEL_SSE_OPT 0 246 # endif 247 # else 248 # define PNG_INTEL_SSE_OPT 0 249 # endif 250 #endif 251 252 #if PNG_INTEL_SSE_OPT > 0 253 # ifndef PNG_INTEL_SSE_IMPLEMENTATION 254 # if defined(__SSE4_1__) || defined(__AVX__) 255 /* We are not actually using AVX, but checking for AVX is the best 256 way we can detect SSE4.1 and SSSE3 on MSVC. 257 */ 258 # define PNG_INTEL_SSE_IMPLEMENTATION 3 259 # elif defined(__SSSE3__) 260 # define PNG_INTEL_SSE_IMPLEMENTATION 2 261 # elif defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \ 262 (defined(_M_IX86_FP) && _M_IX86_FP >= 2) 263 # define PNG_INTEL_SSE_IMPLEMENTATION 1 264 # else 265 # define PNG_INTEL_SSE_IMPLEMENTATION 0 266 # endif 267 # endif 268 269 # if PNG_INTEL_SSE_IMPLEMENTATION > 0 270 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_sse2 271 # endif 272 #else 273 # define PNG_INTEL_SSE_IMPLEMENTATION 0 274 #endif 275 276 #if PNG_MIPS_MSA_OPT > 0 277 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_msa 278 # ifndef PNG_MIPS_MSA_IMPLEMENTATION 279 # if defined(__mips_msa) 280 # if defined(__clang__) 281 # elif defined(__GNUC__) 282 # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7) 283 # define PNG_MIPS_MSA_IMPLEMENTATION 2 284 # endif /* no GNUC support */ 285 # endif /* __GNUC__ */ 286 # else /* !defined __mips_msa */ 287 # define PNG_MIPS_MSA_IMPLEMENTATION 2 288 # endif /* __mips_msa */ 289 # endif /* !PNG_MIPS_MSA_IMPLEMENTATION */ 290 291 # ifndef PNG_MIPS_MSA_IMPLEMENTATION 292 # define PNG_MIPS_MSA_IMPLEMENTATION 1 293 # endif 294 #endif /* PNG_MIPS_MSA_OPT > 0 */ 295 296 #if PNG_POWERPC_VSX_OPT > 0 297 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_vsx 298 # define PNG_POWERPC_VSX_IMPLEMENTATION 1 299 #endif 300 301 302 /* Is this a build of a DLL where compilation of the object modules requires 303 * different preprocessor settings to those required for a simple library? If 304 * so PNG_BUILD_DLL must be set. 305 * 306 * If libpng is used inside a DLL but that DLL does not export the libpng APIs 307 * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a 308 * static library of libpng then link the DLL against that. 309 */ 310 #ifndef PNG_BUILD_DLL 311 # ifdef DLL_EXPORT 312 /* This is set by libtool when files are compiled for a DLL; libtool 313 * always compiles twice, even on systems where it isn't necessary. Set 314 * PNG_BUILD_DLL in case it is necessary: 315 */ 316 # define PNG_BUILD_DLL 317 # else 318 # ifdef _WINDLL 319 /* This is set by the Microsoft Visual Studio IDE in projects that 320 * build a DLL. It can't easily be removed from those projects (it 321 * isn't visible in the Visual Studio UI) so it is a fairly reliable 322 * indication that PNG_IMPEXP needs to be set to the DLL export 323 * attributes. 324 */ 325 # define PNG_BUILD_DLL 326 # else 327 # ifdef __DLL__ 328 /* This is set by the Borland C system when compiling for a DLL 329 * (as above.) 330 */ 331 # define PNG_BUILD_DLL 332 # else 333 /* Add additional compiler cases here. */ 334 # endif 335 # endif 336 # endif 337 #endif /* Setting PNG_BUILD_DLL if required */ 338 339 /* See pngconf.h for more details: the builder of the library may set this on 340 * the command line to the right thing for the specific compilation system or it 341 * may be automagically set above (at present we know of no system where it does 342 * need to be set on the command line.) 343 * 344 * PNG_IMPEXP must be set here when building the library to prevent pngconf.h 345 * setting it to the "import" setting for a DLL build. 346 */ 347 #ifndef PNG_IMPEXP 348 # ifdef PNG_BUILD_DLL 349 # define PNG_IMPEXP PNG_DLL_EXPORT 350 # else 351 /* Not building a DLL, or the DLL doesn't require specific export 352 * definitions. 353 */ 354 # define PNG_IMPEXP 355 # endif 356 #endif 357 358 /* No warnings for private or deprecated functions in the build: */ 359 #ifndef PNG_DEPRECATED 360 # define PNG_DEPRECATED 361 #endif 362 #ifndef PNG_PRIVATE 363 # define PNG_PRIVATE 364 #endif 365 366 /* Symbol preprocessing support. 367 * 368 * To enable listing global, but internal, symbols the following macros should 369 * always be used to declare an extern data or function object in this file. 370 */ 371 #ifndef PNG_INTERNAL_DATA 372 # define PNG_INTERNAL_DATA(type, name, array) PNG_LINKAGE_DATA type name array 373 #endif 374 375 #ifndef PNG_INTERNAL_FUNCTION 376 # define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\ 377 PNG_LINKAGE_FUNCTION PNG_FUNCTION(type, name, args, PNG_EMPTY attributes) 378 #endif 379 380 #ifndef PNG_INTERNAL_CALLBACK 381 # define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\ 382 PNG_LINKAGE_CALLBACK PNG_FUNCTION(type, (PNGCBAPI name), args,\ 383 PNG_EMPTY attributes) 384 #endif 385 386 /* If floating or fixed point APIs are disabled they may still be compiled 387 * internally. To handle this make sure they are declared as the appropriate 388 * internal extern function (otherwise the symbol prefixing stuff won't work and 389 * the functions will be used without definitions.) 390 * 391 * NOTE: although all the API functions are declared here they are not all 392 * actually built! Because the declarations are still made it is necessary to 393 * fake out types that they depend on. 394 */ 395 #ifndef PNG_FP_EXPORT 396 # ifndef PNG_FLOATING_POINT_SUPPORTED 397 # define PNG_FP_EXPORT(ordinal, type, name, args)\ 398 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 399 # ifndef PNG_VERSION_INFO_ONLY 400 typedef struct png_incomplete png_double; 401 typedef png_double* png_doublep; 402 typedef const png_double* png_const_doublep; 403 typedef png_double** png_doublepp; 404 # endif 405 # endif 406 #endif 407 #ifndef PNG_FIXED_EXPORT 408 # ifndef PNG_FIXED_POINT_SUPPORTED 409 # define PNG_FIXED_EXPORT(ordinal, type, name, args)\ 410 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 411 # endif 412 #endif 413 414 #include "png.h" 415 416 /* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */ 417 #ifndef PNG_DLL_EXPORT 418 # define PNG_DLL_EXPORT 419 #endif 420 421 /* This is a global switch to set the compilation for an installed system 422 * (a release build). It can be set for testing debug builds to ensure that 423 * they will compile when the build type is switched to RC or STABLE, the 424 * default is just to use PNG_LIBPNG_BUILD_BASE_TYPE. Set this in CPPFLAGS 425 * with either: 426 * 427 * -DPNG_RELEASE_BUILD Turns on the release compile path 428 * -DPNG_RELEASE_BUILD=0 Turns it off 429 * or in your pngusr.h with 430 * #define PNG_RELEASE_BUILD=1 Turns on the release compile path 431 * #define PNG_RELEASE_BUILD=0 Turns it off 432 */ 433 #ifndef PNG_RELEASE_BUILD 434 # define PNG_RELEASE_BUILD (PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC) 435 #endif 436 437 /* SECURITY and SAFETY: 438 * 439 * libpng is built with support for internal limits on image dimensions and 440 * memory usage. These are documented in scripts/pnglibconf.dfa of the 441 * source and recorded in the machine generated header file pnglibconf.h. 442 */ 443 444 /* If you are running on a machine where you cannot allocate more 445 * than 64K of memory at once, uncomment this. While libpng will not 446 * normally need that much memory in a chunk (unless you load up a very 447 * large file), zlib needs to know how big of a chunk it can use, and 448 * libpng thus makes sure to check any memory allocation to verify it 449 * will fit into memory. 450 * 451 * zlib provides 'MAXSEG_64K' which, if defined, indicates the 452 * same limit and pngconf.h (already included) sets the limit 453 * if certain operating systems are detected. 454 */ 455 #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K) 456 # define PNG_MAX_MALLOC_64K 457 #endif 458 459 #ifndef PNG_UNUSED 460 /* Unused formal parameter warnings are silenced using the following macro 461 * which is expected to have no bad effects on performance (optimizing 462 * compilers will probably remove it entirely). Note that if you replace 463 * it with something other than whitespace, you must include the terminating 464 * semicolon. 465 */ 466 # define PNG_UNUSED(param) (void)param; 467 #endif 468 469 /* Just a little check that someone hasn't tried to define something 470 * contradictory. 471 */ 472 #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K) 473 # undef PNG_ZBUF_SIZE 474 # define PNG_ZBUF_SIZE 65536L 475 #endif 476 477 /* If warnings or errors are turned off the code is disabled or redirected here. 478 * From 1.5.4 functions have been added to allow very limited formatting of 479 * error and warning messages - this code will also be disabled here. 480 */ 481 #ifdef PNG_WARNINGS_SUPPORTED 482 # define PNG_WARNING_PARAMETERS(p) png_warning_parameters p; 483 #else 484 # define png_warning_parameter(p,number,string) ((void)0) 485 # define png_warning_parameter_unsigned(p,number,format,value) ((void)0) 486 # define png_warning_parameter_signed(p,number,format,value) ((void)0) 487 # define png_formatted_warning(pp,p,message) ((void)(pp)) 488 # define PNG_WARNING_PARAMETERS(p) 489 #endif 490 #ifndef PNG_ERROR_TEXT_SUPPORTED 491 # define png_fixed_error(s1,s2) png_err(s1) 492 #endif 493 494 /* Some fixed point APIs are still required even if not exported because 495 * they get used by the corresponding floating point APIs. This magic 496 * deals with this: 497 */ 498 #ifdef PNG_FIXED_POINT_SUPPORTED 499 # define PNGFAPI PNGAPI 500 #else 501 # define PNGFAPI /* PRIVATE */ 502 #endif 503 504 #ifndef PNG_VERSION_INFO_ONLY 505 /* Other defines specific to compilers can go here. Try to keep 506 * them inside an appropriate ifdef/endif pair for portability. 507 */ 508 509 /* C allows up-casts from (void*) to any pointer and (const void*) to any 510 * pointer to a const object. C++ regards this as a type error and requires an 511 * explicit, static, cast and provides the static_cast<> rune to ensure that 512 * const is not cast away. 513 */ 514 #ifdef __cplusplus 515 # define png_voidcast(type, value) static_cast<type>(value) 516 # define png_constcast(type, value) const_cast<type>(value) 517 # define png_aligncast(type, value) \ 518 static_cast<type>(static_cast<void*>(value)) 519 # define png_aligncastconst(type, value) \ 520 static_cast<type>(static_cast<const void*>(value)) 521 #else 522 # define png_voidcast(type, value) (value) 523 # ifdef _WIN64 524 # ifdef __GNUC__ 525 typedef unsigned long long png_ptruint; 526 # else 527 typedef unsigned __int64 png_ptruint; 528 # endif 529 # else 530 typedef unsigned long png_ptruint; 531 # endif 532 # define png_constcast(type, value) ((type)(png_ptruint)(const void*)(value)) 533 # define png_aligncast(type, value) ((void*)(value)) 534 # define png_aligncastconst(type, value) ((const void*)(value)) 535 #endif /* __cplusplus */ 536 537 #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\ 538 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) 539 /* png.c requires the following ANSI-C constants if the conversion of 540 * floating point to ASCII is implemented therein: 541 * 542 * DBL_DIG Maximum number of decimal digits (can be set to any constant) 543 * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value) 544 * DBL_MAX Maximum floating point number (can be set to an arbitrary value) 545 */ 546 # include <float.h> 547 548 # if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \ 549 defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC) 550 /* We need to check that <math.h> hasn't already been included earlier 551 * as it seems it doesn't agree with <fp.h>, yet we should really use 552 * <fp.h> if possible. 553 */ 554 # if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__) 555 # include <fp.h> 556 # endif 557 # else 558 # include <math.h> 559 # endif 560 # if defined(_AMIGA) && defined(__SASC) && defined(_M68881) 561 /* Amiga SAS/C: We must include builtin FPU functions when compiling using 562 * MATH=68881 563 */ 564 # include <m68881.h> 565 # endif 566 #endif 567 568 /* This provides the non-ANSI (far) memory allocation routines. */ 569 #if defined(__TURBOC__) && defined(__MSDOS__) 570 # include <mem.h> 571 # include <alloc.h> 572 #endif 573 574 #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \ 575 defined(_WIN32) || defined(__WIN32__) 576 # include <windows.h> /* defines _WINDOWS_ macro */ 577 #endif 578 #endif /* PNG_VERSION_INFO_ONLY */ 579 580 /* Moved here around 1.5.0beta36 from pngconf.h */ 581 /* Users may want to use these so they are not private. Any library 582 * functions that are passed far data must be model-independent. 583 */ 584 585 /* Memory model/platform independent fns */ 586 #ifndef PNG_ABORT 587 # ifdef _WINDOWS_ 588 # define PNG_ABORT() ExitProcess(0) 589 # else 590 # define PNG_ABORT() abort() 591 # endif 592 #endif 593 594 /* These macros may need to be architecture dependent. */ 595 #define PNG_ALIGN_NONE 0 /* do not use data alignment */ 596 #define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */ 597 #ifdef offsetof 598 # define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */ 599 #else 600 # define PNG_ALIGN_OFFSET -1 /* prevent the use of this */ 601 #endif 602 #define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */ 603 604 #ifndef PNG_ALIGN_TYPE 605 /* Default to using aligned access optimizations and requiring alignment to a 606 * multiple of the data type size. Override in a compiler specific fashion 607 * if necessary by inserting tests here: 608 */ 609 # define PNG_ALIGN_TYPE PNG_ALIGN_SIZE 610 #endif 611 612 #if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE 613 /* This is used because in some compiler implementations non-aligned 614 * structure members are supported, so the offsetof approach below fails. 615 * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access 616 * is good for performance. Do not do this unless you have tested the result 617 * and understand it. 618 */ 619 # define png_alignof(type) (sizeof (type)) 620 #else 621 # if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET 622 # define png_alignof(type) offsetof(struct{char c; type t;}, t) 623 # else 624 # if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS 625 # define png_alignof(type) (1) 626 # endif 627 /* Else leave png_alignof undefined to prevent use thereof */ 628 # endif 629 #endif 630 631 /* This implicitly assumes alignment is always to a power of 2. */ 632 #ifdef png_alignof 633 # define png_isaligned(ptr, type)\ 634 (((type)((const char*)ptr-(const char*)0) & \ 635 (type)(png_alignof(type)-1)) == 0) 636 #else 637 # define png_isaligned(ptr, type) 0 638 #endif 639 640 /* End of memory model/platform independent support */ 641 /* End of 1.5.0beta36 move from pngconf.h */ 642 643 /* CONSTANTS and UTILITY MACROS 644 * These are used internally by libpng and not exposed in the API 645 */ 646 647 /* Various modes of operation. Note that after an init, mode is set to 648 * zero automatically when the structure is created. Three of these 649 * are defined in png.h because they need to be visible to applications 650 * that call png_set_unknown_chunk(). 651 */ 652 /* #define PNG_HAVE_IHDR 0x01U (defined in png.h) */ 653 /* #define PNG_HAVE_PLTE 0x02U (defined in png.h) */ 654 #define PNG_HAVE_IDAT 0x04U 655 /* #define PNG_AFTER_IDAT 0x08U (defined in png.h) */ 656 #define PNG_HAVE_IEND 0x10U 657 /* 0x20U (unused) */ 658 /* 0x40U (unused) */ 659 /* 0x80U (unused) */ 660 #define PNG_HAVE_CHUNK_HEADER 0x100U 661 #define PNG_WROTE_tIME 0x200U 662 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400U 663 #define PNG_BACKGROUND_IS_GRAY 0x800U 664 #define PNG_HAVE_PNG_SIGNATURE 0x1000U 665 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000U /* Have another chunk after IDAT */ 666 /* 0x4000U (unused) */ 667 #define PNG_IS_READ_STRUCT 0x8000U /* Else is a write struct */ 668 669 /* Flags for the transformations the PNG library does on the image data */ 670 #define PNG_BGR 0x0001U 671 #define PNG_INTERLACE 0x0002U 672 #define PNG_PACK 0x0004U 673 #define PNG_SHIFT 0x0008U 674 #define PNG_SWAP_BYTES 0x0010U 675 #define PNG_INVERT_MONO 0x0020U 676 #define PNG_QUANTIZE 0x0040U 677 #define PNG_COMPOSE 0x0080U /* Was PNG_BACKGROUND */ 678 #define PNG_BACKGROUND_EXPAND 0x0100U 679 #define PNG_EXPAND_16 0x0200U /* Added to libpng 1.5.2 */ 680 #define PNG_16_TO_8 0x0400U /* Becomes 'chop' in 1.5.4 */ 681 #define PNG_RGBA 0x0800U 682 #define PNG_EXPAND 0x1000U 683 #define PNG_GAMMA 0x2000U 684 #define PNG_GRAY_TO_RGB 0x4000U 685 #define PNG_FILLER 0x8000U 686 #define PNG_PACKSWAP 0x10000U 687 #define PNG_SWAP_ALPHA 0x20000U 688 #define PNG_STRIP_ALPHA 0x40000U 689 #define PNG_INVERT_ALPHA 0x80000U 690 #define PNG_USER_TRANSFORM 0x100000U 691 #define PNG_RGB_TO_GRAY_ERR 0x200000U 692 #define PNG_RGB_TO_GRAY_WARN 0x400000U 693 #define PNG_RGB_TO_GRAY 0x600000U /* two bits, RGB_TO_GRAY_ERR|WARN */ 694 #define PNG_ENCODE_ALPHA 0x800000U /* Added to libpng-1.5.4 */ 695 #define PNG_ADD_ALPHA 0x1000000U /* Added to libpng-1.2.7 */ 696 #define PNG_EXPAND_tRNS 0x2000000U /* Added to libpng-1.2.9 */ 697 #define PNG_SCALE_16_TO_8 0x4000000U /* Added to libpng-1.5.4 */ 698 /* 0x8000000U unused */ 699 /* 0x10000000U unused */ 700 /* 0x20000000U unused */ 701 /* 0x40000000U unused */ 702 /* Flags for png_create_struct */ 703 #define PNG_STRUCT_PNG 0x0001U 704 #define PNG_STRUCT_INFO 0x0002U 705 706 /* Flags for the png_ptr->flags rather than declaring a byte for each one */ 707 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001U 708 #define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002U /* Added to libpng-1.6.0 */ 709 /* 0x0004U unused */ 710 #define PNG_FLAG_ZSTREAM_ENDED 0x0008U /* Added to libpng-1.6.0 */ 711 /* 0x0010U unused */ 712 /* 0x0020U unused */ 713 #define PNG_FLAG_ROW_INIT 0x0040U 714 #define PNG_FLAG_FILLER_AFTER 0x0080U 715 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100U 716 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200U 717 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400U 718 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800U 719 #define PNG_FLAG_ASSUME_sRGB 0x1000U /* Added to libpng-1.5.4 */ 720 #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000U /* Added to libpng-1.5.4 */ 721 #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000U /* Added to libpng-1.5.4 */ 722 /* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000U */ 723 /* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000U */ 724 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000U 725 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000U 726 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000U 727 #define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000U /* Added to libpng-1.4.0 */ 728 #define PNG_FLAG_APP_WARNINGS_WARN 0x200000U /* Added to libpng-1.6.0 */ 729 #define PNG_FLAG_APP_ERRORS_WARN 0x400000U /* Added to libpng-1.6.0 */ 730 /* 0x800000U unused */ 731 /* 0x1000000U unused */ 732 /* 0x2000000U unused */ 733 /* 0x4000000U unused */ 734 /* 0x8000000U unused */ 735 /* 0x10000000U unused */ 736 /* 0x20000000U unused */ 737 /* 0x40000000U unused */ 738 739 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 740 PNG_FLAG_CRC_ANCILLARY_NOWARN) 741 742 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 743 PNG_FLAG_CRC_CRITICAL_IGNORE) 744 745 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 746 PNG_FLAG_CRC_CRITICAL_MASK) 747 748 /* Save typing and make code easier to understand */ 749 750 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 751 abs((int)((c1).green) - (int)((c2).green)) + \ 752 abs((int)((c1).blue) - (int)((c2).blue))) 753 754 /* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255 755 * by dividing by 257 *with rounding*. This macro is exact for the given range. 756 * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the 757 * macro were established by experiment (modifying the added value). The macro 758 * has a second variant that takes a value already scaled by 255 and divides by 759 * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it 760 * only gives off-by-one errors and only for 0.5% (1 in 200) of the values. 761 */ 762 #define PNG_DIV65535(v24) (((v24) + 32895) >> 16) 763 #define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255) 764 765 /* Added to libpng-1.2.6 JB */ 766 #define PNG_ROWBYTES(pixel_bits, width) \ 767 ((pixel_bits) >= 8 ? \ 768 ((size_t)(width) * (((size_t)(pixel_bits)) >> 3)) : \ 769 (( ((size_t)(width) * ((size_t)(pixel_bits))) + 7) >> 3) ) 770 771 /* This returns the number of trailing bits in the last byte of a row, 0 if the 772 * last byte is completely full of pixels. It is, in principle, (pixel_bits x 773 * width) % 8, but that would overflow for large 'width'. The second macro is 774 * the same except that it returns the number of unused bits in the last byte; 775 * (8-TRAILBITS), but 0 when TRAILBITS is 0. 776 * 777 * NOTE: these macros are intended to be self-evidently correct and never 778 * overflow on the assumption that pixel_bits is in the range 0..255. The 779 * arguments are evaluated only once and they can be signed (e.g. as a result of 780 * the integral promotions). The result of the expression always has type 781 * (png_uint_32), however the compiler always knows it is in the range 0..7. 782 */ 783 #define PNG_TRAILBITS(pixel_bits, width) \ 784 (((pixel_bits) * ((width) % (png_uint_32)8)) % 8) 785 786 #define PNG_PADBITS(pixel_bits, width) \ 787 ((8 - PNG_TRAILBITS(pixel_bits, width)) % 8) 788 789 /* PNG_OUT_OF_RANGE returns true if value is outside the range 790 * ideal-delta..ideal+delta. Each argument is evaluated twice. 791 * "ideal" and "delta" should be constants, normally simple 792 * integers, "value" a variable. Added to libpng-1.2.6 JB 793 */ 794 #define PNG_OUT_OF_RANGE(value, ideal, delta) \ 795 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 796 797 /* Conversions between fixed and floating point, only defined if 798 * required (to make sure the code doesn't accidentally use float 799 * when it is supposedly disabled.) 800 */ 801 #ifdef PNG_FLOATING_POINT_SUPPORTED 802 /* The floating point conversion can't overflow, though it can and 803 * does lose accuracy relative to the original fixed point value. 804 * In practice this doesn't matter because png_fixed_point only 805 * stores numbers with very low precision. The png_ptr and s 806 * arguments are unused by default but are there in case error 807 * checking becomes a requirement. 808 */ 809 #define png_float(png_ptr, fixed, s) (.00001 * (fixed)) 810 811 /* The fixed point conversion performs range checking and evaluates 812 * its argument multiple times, so must be used with care. The 813 * range checking uses the PNG specification values for a signed 814 * 32-bit fixed point value except that the values are deliberately 815 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly 816 * (2^31-1) * 100000). 's' is a string that describes the value being 817 * converted. 818 * 819 * NOTE: this macro will raise a png_error if the range check fails, 820 * therefore it is normally only appropriate to use this on values 821 * that come from API calls or other sources where an out of range 822 * error indicates a programming error, not a data error! 823 * 824 * NOTE: by default this is off - the macro is not used - because the 825 * function call saves a lot of code. 826 */ 827 #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED 828 #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\ 829 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0)) 830 #endif 831 /* else the corresponding function is defined below, inside the scope of the 832 * cplusplus test. 833 */ 834 #endif 835 836 /* Constants for known chunk types. If you need to add a chunk, define the name 837 * here. For historical reasons these constants have the form png_<name>; i.e. 838 * the prefix is lower case. Please use decimal values as the parameters to 839 * match the ISO PNG specification and to avoid relying on the C locale 840 * interpretation of character values. 841 * 842 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values 843 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string 844 * to be generated if required. 845 * 846 * PNG_32b correctly produces a value shifted by up to 24 bits, even on 847 * architectures where (int) is only 16 bits. 848 */ 849 #define PNG_32b(b,s) ((png_uint_32)(b) << (s)) 850 #define PNG_U32(b1,b2,b3,b4) \ 851 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0)) 852 853 /* Constants for known chunk types. 854 * 855 * MAINTAINERS: If you need to add a chunk, define the name here. 856 * For historical reasons these constants have the form png_<name>; i.e. 857 * the prefix is lower case. Please use decimal values as the parameters to 858 * match the ISO PNG specification and to avoid relying on the C locale 859 * interpretation of character values. Please keep the list sorted. 860 * 861 * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk 862 * type. In fact the specification does not express chunk types this way, 863 * however using a 32-bit value means that the chunk type can be read from the 864 * stream using exactly the same code as used for a 32-bit unsigned value and 865 * can be examined far more efficiently (using one arithmetic compare). 866 * 867 * Prior to 1.5.6 the chunk type constants were expressed as C strings. The 868 * libpng API still uses strings for 'unknown' chunks and a macro, 869 * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice 870 * that for portable code numeric values must still be used; the string "IHDR" 871 * is not portable and neither is PNG_U32('I', 'H', 'D', 'R'). 872 * 873 * In 1.7.0 the definitions will be made public in png.h to avoid having to 874 * duplicate the same definitions in application code. 875 */ 876 #define png_IDAT PNG_U32( 73, 68, 65, 84) 877 #define png_IEND PNG_U32( 73, 69, 78, 68) 878 #define png_IHDR PNG_U32( 73, 72, 68, 82) 879 #define png_PLTE PNG_U32( 80, 76, 84, 69) 880 #define png_bKGD PNG_U32( 98, 75, 71, 68) 881 #define png_cHRM PNG_U32( 99, 72, 82, 77) 882 #define png_eXIf PNG_U32(101, 88, 73, 102) /* registered July 2017 */ 883 #define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */ 884 #define png_gAMA PNG_U32(103, 65, 77, 65) 885 #define png_gIFg PNG_U32(103, 73, 70, 103) 886 #define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */ 887 #define png_gIFx PNG_U32(103, 73, 70, 120) 888 #define png_hIST PNG_U32(104, 73, 83, 84) 889 #define png_iCCP PNG_U32(105, 67, 67, 80) 890 #define png_iTXt PNG_U32(105, 84, 88, 116) 891 #define png_oFFs PNG_U32(111, 70, 70, 115) 892 #define png_pCAL PNG_U32(112, 67, 65, 76) 893 #define png_pHYs PNG_U32(112, 72, 89, 115) 894 #define png_sBIT PNG_U32(115, 66, 73, 84) 895 #define png_sCAL PNG_U32(115, 67, 65, 76) 896 #define png_sPLT PNG_U32(115, 80, 76, 84) 897 #define png_sRGB PNG_U32(115, 82, 71, 66) 898 #define png_sTER PNG_U32(115, 84, 69, 82) 899 #define png_tEXt PNG_U32(116, 69, 88, 116) 900 #define png_tIME PNG_U32(116, 73, 77, 69) 901 #define png_tRNS PNG_U32(116, 82, 78, 83) 902 #define png_zTXt PNG_U32(122, 84, 88, 116) 903 904 /* The following will work on (signed char*) strings, whereas the get_uint_32 905 * macro will fail on top-bit-set values because of the sign extension. 906 */ 907 #define PNG_CHUNK_FROM_STRING(s)\ 908 PNG_U32(0xff & (s)[0], 0xff & (s)[1], 0xff & (s)[2], 0xff & (s)[3]) 909 910 /* This uses (char), not (png_byte) to avoid warnings on systems where (char) is 911 * signed and the argument is a (char[]) This macro will fail miserably on 912 * systems where (char) is more than 8 bits. 913 */ 914 #define PNG_STRING_FROM_CHUNK(s,c)\ 915 (void)(((char*)(s))[0]=(char)(((c)>>24) & 0xff), \ 916 ((char*)(s))[1]=(char)(((c)>>16) & 0xff),\ 917 ((char*)(s))[2]=(char)(((c)>>8) & 0xff), \ 918 ((char*)(s))[3]=(char)((c & 0xff))) 919 920 /* Do the same but terminate with a null character. */ 921 #define PNG_CSTRING_FROM_CHUNK(s,c)\ 922 (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0) 923 924 /* Test on flag values as defined in the spec (section 5.4): */ 925 #define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29)) 926 #define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c)) 927 #define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21)) 928 #define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13)) 929 #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5)) 930 931 /* Gamma values (new at libpng-1.5.4): */ 932 #define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */ 933 #define PNG_GAMMA_MAC_INVERSE 65909 934 #define PNG_GAMMA_sRGB_INVERSE 45455 935 936 /* Almost everything below is C specific; the #defines above can be used in 937 * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot. 938 */ 939 #ifndef PNG_VERSION_INFO_ONLY 940 941 #include "pngstruct.h" 942 #include "pnginfo.h" 943 944 /* Validate the include paths - the include path used to generate pnglibconf.h 945 * must match that used in the build, or we must be using pnglibconf.h.prebuilt: 946 */ 947 #if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM 948 # error ZLIB_VERNUM != PNG_ZLIB_VERNUM \ 949 "-I (include path) error: see the notes in pngpriv.h" 950 /* This means that when pnglibconf.h was built the copy of zlib.h that it 951 * used is not the same as the one being used here. Because the build of 952 * libpng makes decisions to use inflateInit2 and inflateReset2 based on the 953 * zlib version number and because this affects handling of certain broken 954 * PNG files the -I directives must match. 955 * 956 * The most likely explanation is that you passed a -I in CFLAGS. This will 957 * not work; all the preprocessor directives and in particular all the -I 958 * directives must be in CPPFLAGS. 959 */ 960 #endif 961 962 /* This is used for 16-bit gamma tables -- only the top level pointers are 963 * const; this could be changed: 964 */ 965 typedef const png_uint_16p * png_const_uint_16pp; 966 967 /* Added to libpng-1.5.7: sRGB conversion tables */ 968 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 969 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 970 #ifdef PNG_SIMPLIFIED_READ_SUPPORTED 971 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]); 972 /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value, 973 * 0..65535. This table gives the closest 16-bit answers (no errors). 974 */ 975 #endif 976 977 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]); 978 PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]); 979 980 #define PNG_sRGB_FROM_LINEAR(linear) \ 981 ((png_byte)(0xff & ((png_sRGB_base[(linear)>>15] \ 982 + ((((linear) & 0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8))) 983 /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB 984 * encoded value with maximum error 0.646365. Note that the input is not a 985 * 16-bit value; it has been multiplied by 255! */ 986 #endif /* SIMPLIFIED_READ/WRITE */ 987 988 989 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 990 #ifdef __cplusplus 991 extern "C" { 992 #endif /* __cplusplus */ 993 994 /* Internal functions; these are not exported from a DLL however because they 995 * are used within several of the C source files they have to be C extern. 996 * 997 * All of these functions must be declared with PNG_INTERNAL_FUNCTION. 998 */ 999 1000 /* Zlib support */ 1001 #define PNG_UNEXPECTED_ZLIB_RETURN (-7) 1002 PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret), 1003 PNG_EMPTY); 1004 /* Used by the zlib handling functions to ensure that z_stream::msg is always 1005 * set before they return. 1006 */ 1007 1008 #ifdef PNG_WRITE_SUPPORTED 1009 PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr, 1010 png_compression_bufferp *list),PNG_EMPTY); 1011 /* Free the buffer list used by the compressed write code. */ 1012 #endif 1013 1014 #if defined(PNG_FLOATING_POINT_SUPPORTED) && \ 1015 !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \ 1016 (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \ 1017 defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \ 1018 defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \ 1019 (defined(PNG_sCAL_SUPPORTED) && \ 1020 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)) 1021 PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr, 1022 double fp, png_const_charp text),PNG_EMPTY); 1023 #endif 1024 1025 /* Check the user version string for compatibility, returns false if the version 1026 * numbers aren't compatible. 1027 */ 1028 PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr, 1029 png_const_charp user_png_ver),PNG_EMPTY); 1030 1031 /* Internal base allocator - no messages, NULL on failure to allocate. This 1032 * does, however, call the application provided allocator and that could call 1033 * png_error (although that would be a bug in the application implementation.) 1034 */ 1035 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr, 1036 png_alloc_size_t size),PNG_ALLOCATED); 1037 1038 #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\ 1039 defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED) 1040 /* Internal array allocator, outputs no error or warning messages on failure, 1041 * just returns NULL. 1042 */ 1043 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr, 1044 int nelements, size_t element_size),PNG_ALLOCATED); 1045 1046 /* The same but an existing array is extended by add_elements. This function 1047 * also memsets the new elements to 0 and copies the old elements. The old 1048 * array is not freed or altered. 1049 */ 1050 PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr, 1051 png_const_voidp array, int old_elements, int add_elements, 1052 size_t element_size),PNG_ALLOCATED); 1053 #endif /* text, sPLT or unknown chunks */ 1054 1055 /* Magic to create a struct when there is no struct to call the user supplied 1056 * memory allocators. Because error handling has not been set up the memory 1057 * handlers can't safely call png_error, but this is an obscure and undocumented 1058 * restriction so libpng has to assume that the 'free' handler, at least, might 1059 * call png_error. 1060 */ 1061 PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct, 1062 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, 1063 png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, 1064 png_free_ptr free_fn),PNG_ALLOCATED); 1065 1066 /* Free memory from internal libpng struct */ 1067 PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr), 1068 PNG_EMPTY); 1069 1070 /* Free an allocated jmp_buf (always succeeds) */ 1071 PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY); 1072 1073 /* Function to allocate memory for zlib. PNGAPI is disallowed. */ 1074 PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size), 1075 PNG_ALLOCATED); 1076 1077 /* Function to free memory for zlib. PNGAPI is disallowed. */ 1078 PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY); 1079 1080 /* Next four functions are used internally as callbacks. PNGCBAPI is required 1081 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to 1082 * PNGCBAPI at 1.5.0 1083 */ 1084 1085 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr, 1086 png_bytep data, size_t length),PNG_EMPTY); 1087 1088 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1089 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr, 1090 png_bytep buffer, size_t length),PNG_EMPTY); 1091 #endif 1092 1093 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr, 1094 png_bytep data, size_t length),PNG_EMPTY); 1095 1096 #ifdef PNG_WRITE_FLUSH_SUPPORTED 1097 # ifdef PNG_STDIO_SUPPORTED 1098 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr), 1099 PNG_EMPTY); 1100 # endif 1101 #endif 1102 1103 /* Reset the CRC variable */ 1104 PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY); 1105 1106 /* Write the "data" buffer to whatever output you are using */ 1107 PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr, 1108 png_const_bytep data, size_t length),PNG_EMPTY); 1109 1110 /* Read and check the PNG file signature */ 1111 PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr, 1112 png_inforp info_ptr),PNG_EMPTY); 1113 1114 /* Read the chunk header (length + type name) */ 1115 PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr), 1116 PNG_EMPTY); 1117 1118 /* Read data from whatever input you are using into the "data" buffer */ 1119 PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data, 1120 size_t length),PNG_EMPTY); 1121 1122 /* Read bytes into buf, and update png_ptr->crc */ 1123 PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf, 1124 png_uint_32 length),PNG_EMPTY); 1125 1126 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 1127 PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr, 1128 png_uint_32 skip),PNG_EMPTY); 1129 1130 /* Read the CRC from the file and compare it to the libpng calculated CRC */ 1131 PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY); 1132 1133 /* Calculate the CRC over a section of data. Note that we are only 1134 * passing a maximum of 64K on systems that have this as a memory limit, 1135 * since this is the maximum buffer size we can specify. 1136 */ 1137 PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr, 1138 png_const_bytep ptr, size_t length),PNG_EMPTY); 1139 1140 #ifdef PNG_WRITE_FLUSH_SUPPORTED 1141 PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY); 1142 #endif 1143 1144 /* Write various chunks */ 1145 1146 /* Write the IHDR chunk, and update the png_struct with the necessary 1147 * information. 1148 */ 1149 PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr, 1150 png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, 1151 int compression_method, int filter_method, int interlace_method),PNG_EMPTY); 1152 1153 PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr, 1154 png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY); 1155 1156 PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr, 1157 png_const_bytep row_data, png_alloc_size_t row_data_length, int flush), 1158 PNG_EMPTY); 1159 1160 PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY); 1161 1162 #ifdef PNG_WRITE_gAMA_SUPPORTED 1163 PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr, 1164 png_fixed_point file_gamma),PNG_EMPTY); 1165 #endif 1166 1167 #ifdef PNG_WRITE_sBIT_SUPPORTED 1168 PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr, 1169 png_const_color_8p sbit, int color_type),PNG_EMPTY); 1170 #endif 1171 1172 #ifdef PNG_WRITE_cHRM_SUPPORTED 1173 PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr, 1174 const png_xy *xy), PNG_EMPTY); 1175 /* The xy value must have been previously validated */ 1176 #endif 1177 1178 #ifdef PNG_WRITE_sRGB_SUPPORTED 1179 PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr, 1180 int intent),PNG_EMPTY); 1181 #endif 1182 1183 #ifdef PNG_WRITE_eXIf_SUPPORTED 1184 PNG_INTERNAL_FUNCTION(void,png_write_eXIf,(png_structrp png_ptr, 1185 png_bytep exif, int num_exif),PNG_EMPTY); 1186 #endif 1187 1188 #ifdef PNG_WRITE_iCCP_SUPPORTED 1189 PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr, 1190 png_const_charp name, png_const_bytep profile), PNG_EMPTY); 1191 /* The profile must have been previously validated for correctness, the 1192 * length comes from the first four bytes. Only the base, deflate, 1193 * compression is supported. 1194 */ 1195 #endif 1196 1197 #ifdef PNG_WRITE_sPLT_SUPPORTED 1198 PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr, 1199 png_const_sPLT_tp palette),PNG_EMPTY); 1200 #endif 1201 1202 #ifdef PNG_WRITE_tRNS_SUPPORTED 1203 PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr, 1204 png_const_bytep trans, png_const_color_16p values, int number, 1205 int color_type),PNG_EMPTY); 1206 #endif 1207 1208 #ifdef PNG_WRITE_bKGD_SUPPORTED 1209 PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr, 1210 png_const_color_16p values, int color_type),PNG_EMPTY); 1211 #endif 1212 1213 #ifdef PNG_WRITE_hIST_SUPPORTED 1214 PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr, 1215 png_const_uint_16p hist, int num_hist),PNG_EMPTY); 1216 #endif 1217 1218 /* Chunks that have keywords */ 1219 #ifdef PNG_WRITE_tEXt_SUPPORTED 1220 PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr, 1221 png_const_charp key, png_const_charp text, size_t text_len),PNG_EMPTY); 1222 #endif 1223 1224 #ifdef PNG_WRITE_zTXt_SUPPORTED 1225 PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp 1226 key, png_const_charp text, int compression),PNG_EMPTY); 1227 #endif 1228 1229 #ifdef PNG_WRITE_iTXt_SUPPORTED 1230 PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr, 1231 int compression, png_const_charp key, png_const_charp lang, 1232 png_const_charp lang_key, png_const_charp text),PNG_EMPTY); 1233 #endif 1234 1235 #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ 1236 PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr, 1237 png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY); 1238 #endif 1239 1240 #ifdef PNG_WRITE_oFFs_SUPPORTED 1241 PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr, 1242 png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY); 1243 #endif 1244 1245 #ifdef PNG_WRITE_pCAL_SUPPORTED 1246 PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr, 1247 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, 1248 png_const_charp units, png_charpp params),PNG_EMPTY); 1249 #endif 1250 1251 #ifdef PNG_WRITE_pHYs_SUPPORTED 1252 PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr, 1253 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 1254 int unit_type),PNG_EMPTY); 1255 #endif 1256 1257 #ifdef PNG_WRITE_tIME_SUPPORTED 1258 PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr, 1259 png_const_timep mod_time),PNG_EMPTY); 1260 #endif 1261 1262 #ifdef PNG_WRITE_sCAL_SUPPORTED 1263 PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr, 1264 int unit, png_const_charp width, png_const_charp height),PNG_EMPTY); 1265 #endif 1266 1267 /* Called when finished processing a row of data */ 1268 PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr), 1269 PNG_EMPTY); 1270 1271 /* Internal use only. Called before first row of data */ 1272 PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr), 1273 PNG_EMPTY); 1274 1275 /* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an 1276 * array of png_ptr->width pixels. If the image is not interlaced or this 1277 * is the final pass this just does a memcpy, otherwise the "display" flag 1278 * is used to determine whether to copy pixels that are not in the current pass. 1279 * 1280 * Because 'png_do_read_interlace' (below) replicates pixels this allows this 1281 * function to achieve the documented 'blocky' appearance during interlaced read 1282 * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row' 1283 * are not changed if they are not in the current pass, when display is 0. 1284 * 1285 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless. 1286 * 1287 * The API always reads from the png_struct row buffer and always assumes that 1288 * it is full width (png_do_read_interlace has already been called.) 1289 * 1290 * This function is only ever used to write to row buffers provided by the 1291 * caller of the relevant libpng API and the row must have already been 1292 * transformed by the read transformations. 1293 * 1294 * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed 1295 * bitmasks for use within the code, otherwise runtime generated masks are used. 1296 * The default is compile time masks. 1297 */ 1298 #ifndef PNG_USE_COMPILE_TIME_MASKS 1299 # define PNG_USE_COMPILE_TIME_MASKS 1 1300 #endif 1301 PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr, 1302 png_bytep row, int display),PNG_EMPTY); 1303 1304 #ifdef PNG_READ_INTERLACING_SUPPORTED 1305 /* Expand an interlaced row: the 'row_info' describes the pass data that has 1306 * been read in and must correspond to the pixels in 'row', the pixels are 1307 * expanded (moved apart) in 'row' to match the final layout, when doing this 1308 * the pixels are *replicated* to the intervening space. This is essential for 1309 * the correct operation of png_combine_row, above. 1310 */ 1311 PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info, 1312 png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY); 1313 #endif 1314 1315 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 1316 1317 #ifdef PNG_WRITE_INTERLACING_SUPPORTED 1318 /* Grab pixels out of a row for an interlaced pass */ 1319 PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info, 1320 png_bytep row, int pass),PNG_EMPTY); 1321 #endif 1322 1323 /* Unfilter a row: check the filter value before calling this, there is no point 1324 * calling it for PNG_FILTER_VALUE_NONE. 1325 */ 1326 PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop 1327 row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY); 1328 1329 #if PNG_ARM_NEON_OPT > 0 1330 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info, 1331 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1332 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop 1333 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1334 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop 1335 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1336 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop 1337 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1338 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop 1339 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1340 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop 1341 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1342 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop 1343 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1344 #endif 1345 1346 #if PNG_MIPS_MSA_OPT > 0 1347 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_msa,(png_row_infop row_info, 1348 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1349 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_msa,(png_row_infop 1350 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1351 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_msa,(png_row_infop 1352 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1353 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_msa,(png_row_infop 1354 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1355 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_msa,(png_row_infop 1356 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1357 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_msa,(png_row_infop 1358 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1359 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_msa,(png_row_infop 1360 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1361 #endif 1362 1363 #if PNG_POWERPC_VSX_OPT > 0 1364 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_vsx,(png_row_infop row_info, 1365 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1366 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_vsx,(png_row_infop 1367 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1368 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_vsx,(png_row_infop 1369 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1370 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_vsx,(png_row_infop 1371 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1372 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_vsx,(png_row_infop 1373 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1374 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_vsx,(png_row_infop 1375 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1376 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_vsx,(png_row_infop 1377 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1378 #endif 1379 1380 #if PNG_INTEL_SSE_IMPLEMENTATION > 0 1381 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_sse2,(png_row_infop 1382 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1383 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_sse2,(png_row_infop 1384 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1385 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_sse2,(png_row_infop 1386 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1387 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_sse2,(png_row_infop 1388 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1389 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_sse2,(png_row_infop 1390 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1391 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_sse2,(png_row_infop 1392 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1393 #endif 1394 1395 /* Choose the best filter to use and filter the row data */ 1396 PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr, 1397 png_row_infop row_info),PNG_EMPTY); 1398 1399 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED 1400 PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr, 1401 png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY); 1402 /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer 1403 * is NULL the function checks, instead, for the end of the stream. In this 1404 * case a benign error will be issued if the stream end is not found or if 1405 * extra data has to be consumed. 1406 */ 1407 PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr), 1408 PNG_EMPTY); 1409 /* This cleans up when the IDAT LZ stream does not end when the last image 1410 * byte is read; there is still some pending input. 1411 */ 1412 1413 PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr), 1414 PNG_EMPTY); 1415 /* Finish a row while reading, dealing with interlacing passes, etc. */ 1416 #endif /* SEQUENTIAL_READ */ 1417 1418 /* Initialize the row buffers, etc. */ 1419 PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY); 1420 1421 #if ZLIB_VERNUM >= 0x1240 1422 PNG_INTERNAL_FUNCTION(int,png_zlib_inflate,(png_structrp png_ptr, int flush), 1423 PNG_EMPTY); 1424 # define PNG_INFLATE(pp, flush) png_zlib_inflate(pp, flush) 1425 #else /* Zlib < 1.2.4 */ 1426 # define PNG_INFLATE(pp, flush) inflate(&(pp)->zstream, flush) 1427 #endif /* Zlib < 1.2.4 */ 1428 1429 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1430 /* Optional call to update the users info structure */ 1431 PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr, 1432 png_inforp info_ptr),PNG_EMPTY); 1433 #endif 1434 1435 /* Shared transform functions, defined in pngtran.c */ 1436 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 1437 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 1438 PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info, 1439 png_bytep row, int at_start),PNG_EMPTY); 1440 #endif 1441 1442 #ifdef PNG_16BIT_SUPPORTED 1443 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 1444 PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info, 1445 png_bytep row),PNG_EMPTY); 1446 #endif 1447 #endif 1448 1449 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ 1450 defined(PNG_WRITE_PACKSWAP_SUPPORTED) 1451 PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info, 1452 png_bytep row),PNG_EMPTY); 1453 #endif 1454 1455 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 1456 PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info, 1457 png_bytep row),PNG_EMPTY); 1458 #endif 1459 1460 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1461 PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info, 1462 png_bytep row),PNG_EMPTY); 1463 #endif 1464 1465 /* The following decodes the appropriate chunks, and does error correction, 1466 * then calls the appropriate callback for the chunk if it is valid. 1467 */ 1468 1469 /* Decode the IHDR chunk */ 1470 PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr, 1471 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1472 PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr, 1473 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1474 PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr, 1475 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1476 1477 #ifdef PNG_READ_bKGD_SUPPORTED 1478 PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr, 1479 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1480 #endif 1481 1482 #ifdef PNG_READ_cHRM_SUPPORTED 1483 PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr, 1484 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1485 #endif 1486 1487 #ifdef PNG_READ_eXIf_SUPPORTED 1488 PNG_INTERNAL_FUNCTION(void,png_handle_eXIf,(png_structrp png_ptr, 1489 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1490 #endif 1491 1492 #ifdef PNG_READ_gAMA_SUPPORTED 1493 PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr, 1494 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1495 #endif 1496 1497 #ifdef PNG_READ_hIST_SUPPORTED 1498 PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr, 1499 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1500 #endif 1501 1502 #ifdef PNG_READ_iCCP_SUPPORTED 1503 PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr, 1504 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1505 #endif /* READ_iCCP */ 1506 1507 #ifdef PNG_READ_iTXt_SUPPORTED 1508 PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr, 1509 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1510 #endif 1511 1512 #ifdef PNG_READ_oFFs_SUPPORTED 1513 PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr, 1514 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1515 #endif 1516 1517 #ifdef PNG_READ_pCAL_SUPPORTED 1518 PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr, 1519 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1520 #endif 1521 1522 #ifdef PNG_READ_pHYs_SUPPORTED 1523 PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr, 1524 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1525 #endif 1526 1527 #ifdef PNG_READ_sBIT_SUPPORTED 1528 PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr, 1529 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1530 #endif 1531 1532 #ifdef PNG_READ_sCAL_SUPPORTED 1533 PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr, 1534 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1535 #endif 1536 1537 #ifdef PNG_READ_sPLT_SUPPORTED 1538 PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr, 1539 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1540 #endif /* READ_sPLT */ 1541 1542 #ifdef PNG_READ_sRGB_SUPPORTED 1543 PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr, 1544 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1545 #endif 1546 1547 #ifdef PNG_READ_tEXt_SUPPORTED 1548 PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr, 1549 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1550 #endif 1551 1552 #ifdef PNG_READ_tIME_SUPPORTED 1553 PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr, 1554 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1555 #endif 1556 1557 #ifdef PNG_READ_tRNS_SUPPORTED 1558 PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr, 1559 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1560 #endif 1561 1562 #ifdef PNG_READ_zTXt_SUPPORTED 1563 PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr, 1564 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1565 #endif 1566 1567 PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_const_structrp png_ptr, 1568 png_uint_32 chunk_name),PNG_EMPTY); 1569 1570 PNG_INTERNAL_FUNCTION(void,png_check_chunk_length,(png_const_structrp png_ptr, 1571 png_uint_32 chunk_length),PNG_EMPTY); 1572 1573 PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr, 1574 png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY); 1575 /* This is the function that gets called for unknown chunks. The 'keep' 1576 * argument is either non-zero for a known chunk that has been set to be 1577 * handled as unknown or zero for an unknown chunk. By default the function 1578 * just skips the chunk or errors out if it is critical. 1579 */ 1580 1581 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\ 1582 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 1583 PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling, 1584 (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY); 1585 /* Exactly as the API png_handle_as_unknown() except that the argument is a 1586 * 32-bit chunk name, not a string. 1587 */ 1588 #endif /* READ_UNKNOWN_CHUNKS || HANDLE_AS_UNKNOWN */ 1589 1590 /* Handle the transformations for reading and writing */ 1591 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1592 PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr, 1593 png_row_infop row_info),PNG_EMPTY); 1594 #endif 1595 #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED 1596 PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr, 1597 png_row_infop row_info),PNG_EMPTY); 1598 #endif 1599 1600 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1601 PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr), 1602 PNG_EMPTY); 1603 #endif 1604 1605 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1606 PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr, 1607 png_inforp info_ptr),PNG_EMPTY); 1608 PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr, 1609 png_inforp info_ptr),PNG_EMPTY); 1610 PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY); 1611 PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr), 1612 PNG_EMPTY); 1613 PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr, 1614 png_bytep buffer, size_t buffer_length),PNG_EMPTY); 1615 PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY); 1616 PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr, 1617 png_bytep buffer, size_t buffer_length),PNG_EMPTY); 1618 PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr), 1619 PNG_EMPTY); 1620 PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr, 1621 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1622 PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr, 1623 png_inforp info_ptr),PNG_EMPTY); 1624 PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr, 1625 png_inforp info_ptr),PNG_EMPTY); 1626 PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr, 1627 png_bytep row),PNG_EMPTY); 1628 PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr, 1629 png_inforp info_ptr),PNG_EMPTY); 1630 PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr, 1631 png_inforp info_ptr),PNG_EMPTY); 1632 PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr), 1633 PNG_EMPTY); 1634 # ifdef PNG_READ_tEXt_SUPPORTED 1635 PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr, 1636 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1637 PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr, 1638 png_inforp info_ptr),PNG_EMPTY); 1639 # endif 1640 # ifdef PNG_READ_zTXt_SUPPORTED 1641 PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr, 1642 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1643 PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr, 1644 png_inforp info_ptr),PNG_EMPTY); 1645 # endif 1646 # ifdef PNG_READ_iTXt_SUPPORTED 1647 PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr, 1648 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1649 PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr, 1650 png_inforp info_ptr),PNG_EMPTY); 1651 # endif 1652 1653 #endif /* PROGRESSIVE_READ */ 1654 1655 /* Added at libpng version 1.6.0 */ 1656 #ifdef PNG_GAMMA_SUPPORTED 1657 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr, 1658 png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY); 1659 /* Set the colorspace gamma with a value provided by the application or by 1660 * the gAMA chunk on read. The value will override anything set by an ICC 1661 * profile. 1662 */ 1663 1664 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr, 1665 png_inforp info_ptr), PNG_EMPTY); 1666 /* Synchronize the info 'valid' flags with the colorspace */ 1667 1668 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr, 1669 png_inforp info_ptr), PNG_EMPTY); 1670 /* Copy the png_struct colorspace to the info_struct and call the above to 1671 * synchronize the flags. Checks for NULL info_ptr and does nothing. 1672 */ 1673 #endif 1674 1675 /* Added at libpng version 1.4.0 */ 1676 #ifdef PNG_COLORSPACE_SUPPORTED 1677 /* These internal functions are for maintaining the colorspace structure within 1678 * a png_info or png_struct (or, indeed, both). 1679 */ 1680 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities, 1681 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy, 1682 int preferred), PNG_EMPTY); 1683 1684 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints, 1685 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ, 1686 int preferred), PNG_EMPTY); 1687 1688 #ifdef PNG_sRGB_SUPPORTED 1689 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr, 1690 png_colorspacerp colorspace, int intent), PNG_EMPTY); 1691 /* This does set the colorspace gAMA and cHRM values too, but doesn't set the 1692 * flags to write them, if it returns false there was a problem and an error 1693 * message has already been output (but the colorspace may still need to be 1694 * synced to record the invalid flag). 1695 */ 1696 #endif /* sRGB */ 1697 1698 #ifdef PNG_iCCP_SUPPORTED 1699 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr, 1700 png_colorspacerp colorspace, png_const_charp name, 1701 png_uint_32 profile_length, png_const_bytep profile, int color_type), 1702 PNG_EMPTY); 1703 /* The 'name' is used for information only */ 1704 1705 /* Routines for checking parts of an ICC profile. */ 1706 #ifdef PNG_READ_iCCP_SUPPORTED 1707 PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr, 1708 png_colorspacerp colorspace, png_const_charp name, 1709 png_uint_32 profile_length), PNG_EMPTY); 1710 #endif /* READ_iCCP */ 1711 PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr, 1712 png_colorspacerp colorspace, png_const_charp name, 1713 png_uint_32 profile_length, 1714 png_const_bytep profile /* first 132 bytes only */, int color_type), 1715 PNG_EMPTY); 1716 PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr, 1717 png_colorspacerp colorspace, png_const_charp name, 1718 png_uint_32 profile_length, 1719 png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY); 1720 #ifdef PNG_sRGB_SUPPORTED 1721 PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,( 1722 png_const_structrp png_ptr, png_colorspacerp colorspace, 1723 png_const_bytep profile, uLong adler), PNG_EMPTY); 1724 /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may 1725 * be zero to indicate that it is not available. It is used, if provided, 1726 * as a fast check on the profile when checking to see if it is sRGB. 1727 */ 1728 #endif 1729 #endif /* iCCP */ 1730 1731 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1732 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients, 1733 (png_structrp png_ptr), PNG_EMPTY); 1734 /* Set the rgb_to_gray coefficients from the colorspace Y values */ 1735 #endif /* READ_RGB_TO_GRAY */ 1736 #endif /* COLORSPACE */ 1737 1738 /* Added at libpng version 1.4.0 */ 1739 PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr, 1740 png_uint_32 width, png_uint_32 height, int bit_depth, 1741 int color_type, int interlace_type, int compression_type, 1742 int filter_type),PNG_EMPTY); 1743 1744 /* Added at libpng version 1.5.10 */ 1745 #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \ 1746 defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED) 1747 PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes, 1748 (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY); 1749 #endif 1750 1751 #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) 1752 PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr, 1753 png_const_charp name),PNG_NORETURN); 1754 #endif 1755 1756 /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite 1757 * the end. Always leaves the buffer nul terminated. Never errors out (and 1758 * there is no error code.) 1759 */ 1760 PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize, 1761 size_t pos, png_const_charp string),PNG_EMPTY); 1762 1763 /* Various internal functions to handle formatted warning messages, currently 1764 * only implemented for warnings. 1765 */ 1766 #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) 1767 /* Utility to dump an unsigned value into a buffer, given a start pointer and 1768 * and end pointer (which should point just *beyond* the end of the buffer!) 1769 * Returns the pointer to the start of the formatted string. This utility only 1770 * does unsigned values. 1771 */ 1772 PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start, 1773 png_charp end, int format, png_alloc_size_t number),PNG_EMPTY); 1774 1775 /* Convenience macro that takes an array: */ 1776 #define PNG_FORMAT_NUMBER(buffer,format,number) \ 1777 png_format_number(buffer, buffer + (sizeof buffer), format, number) 1778 1779 /* Suggested size for a number buffer (enough for 64 bits and a sign!) */ 1780 #define PNG_NUMBER_BUFFER_SIZE 24 1781 1782 /* These are the integer formats currently supported, the name is formed from 1783 * the standard printf(3) format string. 1784 */ 1785 #define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */ 1786 #define PNG_NUMBER_FORMAT_02u 2 1787 #define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */ 1788 #define PNG_NUMBER_FORMAT_02d 2 1789 #define PNG_NUMBER_FORMAT_x 3 1790 #define PNG_NUMBER_FORMAT_02x 4 1791 #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */ 1792 #endif 1793 1794 #ifdef PNG_WARNINGS_SUPPORTED 1795 /* New defines and members adding in libpng-1.5.4 */ 1796 # define PNG_WARNING_PARAMETER_SIZE 32 1797 # define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */ 1798 1799 /* An l-value of this type has to be passed to the APIs below to cache the 1800 * values of the parameters to a formatted warning message. 1801 */ 1802 typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][ 1803 PNG_WARNING_PARAMETER_SIZE]; 1804 1805 PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p, 1806 int number, png_const_charp string),PNG_EMPTY); 1807 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters, 1808 * including the trailing '\0'. 1809 */ 1810 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned, 1811 (png_warning_parameters p, int number, int format, png_alloc_size_t value), 1812 PNG_EMPTY); 1813 /* Use png_alloc_size_t because it is an unsigned type as big as any we 1814 * need to output. Use the following for a signed value. 1815 */ 1816 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed, 1817 (png_warning_parameters p, int number, int format, png_int_32 value), 1818 PNG_EMPTY); 1819 1820 PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr, 1821 png_warning_parameters p, png_const_charp message),PNG_EMPTY); 1822 /* 'message' follows the X/Open approach of using @1, @2 to insert 1823 * parameters previously supplied using the above functions. Errors in 1824 * specifying the parameters will simply result in garbage substitutions. 1825 */ 1826 #endif 1827 1828 #ifdef PNG_BENIGN_ERRORS_SUPPORTED 1829 /* Application errors (new in 1.6); use these functions (declared below) for 1830 * errors in the parameters or order of API function calls on read. The 1831 * 'warning' should be used for an error that can be handled completely; the 1832 * 'error' for one which can be handled safely but which may lose application 1833 * information or settings. 1834 * 1835 * By default these both result in a png_error call prior to release, while in a 1836 * released version the 'warning' is just a warning. However if the application 1837 * explicitly disables benign errors (explicitly permitting the code to lose 1838 * information) they both turn into warnings. 1839 * 1840 * If benign errors aren't supported they end up as the corresponding base call 1841 * (png_warning or png_error.) 1842 */ 1843 PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr, 1844 png_const_charp message),PNG_EMPTY); 1845 /* The application provided invalid parameters to an API function or called 1846 * an API function at the wrong time, libpng can completely recover. 1847 */ 1848 1849 PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr, 1850 png_const_charp message),PNG_EMPTY); 1851 /* As above but libpng will ignore the call, or attempt some other partial 1852 * recovery from the error. 1853 */ 1854 #else 1855 # define png_app_warning(pp,s) png_warning(pp,s) 1856 # define png_app_error(pp,s) png_error(pp,s) 1857 #endif 1858 1859 PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr, 1860 png_const_charp message, int error),PNG_EMPTY); 1861 /* Report a recoverable issue in chunk data. On read this is used to report 1862 * a problem found while reading a particular chunk and the 1863 * png_chunk_benign_error or png_chunk_warning function is used as 1864 * appropriate. On write this is used to report an error that comes from 1865 * data set via an application call to a png_set_ API and png_app_error or 1866 * png_app_warning is used as appropriate. 1867 * 1868 * The 'error' parameter must have one of the following values: 1869 */ 1870 #define PNG_CHUNK_WARNING 0 /* never an error */ 1871 #define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */ 1872 #define PNG_CHUNK_ERROR 2 /* always an error */ 1873 1874 /* ASCII to FP interfaces, currently only implemented if sCAL 1875 * support is required. 1876 */ 1877 #if defined(PNG_sCAL_SUPPORTED) 1878 /* MAX_DIGITS is actually the maximum number of characters in an sCAL 1879 * width or height, derived from the precision (number of significant 1880 * digits - a build time settable option) and assumptions about the 1881 * maximum ridiculous exponent. 1882 */ 1883 #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/) 1884 1885 #ifdef PNG_FLOATING_POINT_SUPPORTED 1886 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr, 1887 png_charp ascii, size_t size, double fp, unsigned int precision), 1888 PNG_EMPTY); 1889 #endif /* FLOATING_POINT */ 1890 1891 #ifdef PNG_FIXED_POINT_SUPPORTED 1892 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr, 1893 png_charp ascii, size_t size, png_fixed_point fp),PNG_EMPTY); 1894 #endif /* FIXED_POINT */ 1895 #endif /* sCAL */ 1896 1897 #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) 1898 /* An internal API to validate the format of a floating point number. 1899 * The result is the index of the next character. If the number is 1900 * not valid it will be the index of a character in the supposed number. 1901 * 1902 * The format of a number is defined in the PNG extensions specification 1903 * and this API is strictly conformant to that spec, not anyone elses! 1904 * 1905 * The format as a regular expression is: 1906 * 1907 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)? 1908 * 1909 * or: 1910 * 1911 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)? 1912 * 1913 * The complexity is that either integer or fraction must be present and the 1914 * fraction is permitted to have no digits only if the integer is present. 1915 * 1916 * NOTE: The dangling E problem. 1917 * There is a PNG valid floating point number in the following: 1918 * 1919 * PNG floating point numbers are not greedy. 1920 * 1921 * Working this out requires *TWO* character lookahead (because of the 1922 * sign), the parser does not do this - it will fail at the 'r' - this 1923 * doesn't matter for PNG sCAL chunk values, but it requires more care 1924 * if the value were ever to be embedded in something more complex. Use 1925 * ANSI-C strtod if you need the lookahead. 1926 */ 1927 /* State table for the parser. */ 1928 #define PNG_FP_INTEGER 0 /* before or in integer */ 1929 #define PNG_FP_FRACTION 1 /* before or in fraction */ 1930 #define PNG_FP_EXPONENT 2 /* before or in exponent */ 1931 #define PNG_FP_STATE 3 /* mask for the above */ 1932 #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */ 1933 #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */ 1934 #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */ 1935 #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */ 1936 #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */ 1937 1938 /* These three values don't affect the parser. They are set but not used. 1939 */ 1940 #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */ 1941 #define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */ 1942 #define PNG_FP_NONZERO 256 /* A non-zero value */ 1943 #define PNG_FP_STICKY 448 /* The above three flags */ 1944 1945 /* This is available for the caller to store in 'state' if required. Do not 1946 * call the parser after setting it (the parser sometimes clears it.) 1947 */ 1948 #define PNG_FP_INVALID 512 /* Available for callers as a distinct value */ 1949 1950 /* Result codes for the parser (boolean - true meants ok, false means 1951 * not ok yet.) 1952 */ 1953 #define PNG_FP_MAYBE 0 /* The number may be valid in the future */ 1954 #define PNG_FP_OK 1 /* The number is valid */ 1955 1956 /* Tests on the sticky non-zero and negative flags. To pass these checks 1957 * the state must also indicate that the whole number is valid - this is 1958 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this 1959 * is equivalent to PNG_FP_OK above.) 1960 */ 1961 #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO) 1962 /* NZ_MASK: the string is valid and a non-zero negative value */ 1963 #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO) 1964 /* Z MASK: the string is valid and a non-zero value. */ 1965 /* PNG_FP_SAW_DIGIT: the string is valid. */ 1966 #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT) 1967 #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK) 1968 #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK) 1969 1970 /* The actual parser. This can be called repeatedly. It updates 1971 * the index into the string and the state variable (which must 1972 * be initialized to 0). It returns a result code, as above. There 1973 * is no point calling the parser any more if it fails to advance to 1974 * the end of the string - it is stuck on an invalid character (or 1975 * terminated by '\0'). 1976 * 1977 * Note that the pointer will consume an E or even an E+ and then leave 1978 * a 'maybe' state even though a preceding integer.fraction is valid. 1979 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was 1980 * a valid number. It's possible to recover from this by calling 1981 * the parser again (from the start, with state 0) but with a string 1982 * that omits the last character (i.e. set the size to the index of 1983 * the problem character.) This has not been tested within libpng. 1984 */ 1985 PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string, 1986 size_t size, int *statep, png_size_tp whereami),PNG_EMPTY); 1987 1988 /* This is the same but it checks a complete string and returns true 1989 * only if it just contains a floating point number. As of 1.5.4 this 1990 * function also returns the state at the end of parsing the number if 1991 * it was valid (otherwise it returns 0.) This can be used for testing 1992 * for negative or zero values using the sticky flag. 1993 */ 1994 PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string, 1995 size_t size),PNG_EMPTY); 1996 #endif /* pCAL || sCAL */ 1997 1998 #if defined(PNG_GAMMA_SUPPORTED) ||\ 1999 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED) 2000 /* Added at libpng version 1.5.0 */ 2001 /* This is a utility to provide a*times/div (rounded) and indicate 2002 * if there is an overflow. The result is a boolean - false (0) 2003 * for overflow, true (1) if no overflow, in which case *res 2004 * holds the result. 2005 */ 2006 PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a, 2007 png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY); 2008 #endif 2009 2010 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED) 2011 /* Same deal, but issue a warning on overflow and return 0. */ 2012 PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn, 2013 (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by, 2014 png_int_32 divided_by),PNG_EMPTY); 2015 #endif 2016 2017 #ifdef PNG_GAMMA_SUPPORTED 2018 /* Calculate a reciprocal - used for gamma values. This returns 2019 * 0 if the argument is 0 in order to maintain an undefined value; 2020 * there are no warnings. 2021 */ 2022 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a), 2023 PNG_EMPTY); 2024 2025 #ifdef PNG_READ_GAMMA_SUPPORTED 2026 /* The same but gives a reciprocal of the product of two fixed point 2027 * values. Accuracy is suitable for gamma calculations but this is 2028 * not exact - use png_muldiv for that. Only required at present on read. 2029 */ 2030 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a, 2031 png_fixed_point b),PNG_EMPTY); 2032 #endif 2033 2034 /* Return true if the gamma value is significantly different from 1.0 */ 2035 PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value), 2036 PNG_EMPTY); 2037 #endif 2038 2039 #ifdef PNG_READ_GAMMA_SUPPORTED 2040 /* Internal fixed point gamma correction. These APIs are called as 2041 * required to convert single values - they don't need to be fast, 2042 * they are not used when processing image pixel values. 2043 * 2044 * While the input is an 'unsigned' value it must actually be the 2045 * correct bit value - 0..255 or 0..65535 as required. 2046 */ 2047 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr, 2048 unsigned int value, png_fixed_point gamma_value),PNG_EMPTY); 2049 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value, 2050 png_fixed_point gamma_value),PNG_EMPTY); 2051 PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value, 2052 png_fixed_point gamma_value),PNG_EMPTY); 2053 PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr), 2054 PNG_EMPTY); 2055 PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr, 2056 int bit_depth),PNG_EMPTY); 2057 #endif 2058 2059 /* SIMPLIFIED READ/WRITE SUPPORT */ 2060 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 2061 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 2062 /* The internal structure that png_image::opaque points to. */ 2063 typedef struct png_control 2064 { 2065 png_structp png_ptr; 2066 png_infop info_ptr; 2067 png_voidp error_buf; /* Always a jmp_buf at present. */ 2068 2069 png_const_bytep memory; /* Memory buffer. */ 2070 size_t size; /* Size of the memory buffer. */ 2071 2072 unsigned int for_write :1; /* Otherwise it is a read structure */ 2073 unsigned int owned_file :1; /* We own the file in io_ptr */ 2074 } png_control; 2075 2076 /* Return the pointer to the jmp_buf from a png_control: necessary because C 2077 * does not reveal the type of the elements of jmp_buf. 2078 */ 2079 #ifdef __cplusplus 2080 # define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0]) 2081 #else 2082 # define png_control_jmp_buf(pc) ((pc)->error_buf) 2083 #endif 2084 2085 /* Utility to safely execute a piece of libpng code catching and logging any 2086 * errors that might occur. Returns true on success, false on failure (either 2087 * of the function or as a result of a png_error.) 2088 */ 2089 PNG_INTERNAL_CALLBACK(void,png_safe_error,(png_structp png_ptr, 2090 png_const_charp error_message),PNG_NORETURN); 2091 2092 #ifdef PNG_WARNINGS_SUPPORTED 2093 PNG_INTERNAL_CALLBACK(void,png_safe_warning,(png_structp png_ptr, 2094 png_const_charp warning_message),PNG_EMPTY); 2095 #else 2096 # define png_safe_warning 0/*dummy argument*/ 2097 #endif 2098 2099 PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image, 2100 int (*function)(png_voidp), png_voidp arg),PNG_EMPTY); 2101 2102 /* Utility to log an error; this also cleans up the png_image; the function 2103 * always returns 0 (false). 2104 */ 2105 PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image, 2106 png_const_charp error_message),PNG_EMPTY); 2107 2108 #ifndef PNG_SIMPLIFIED_READ_SUPPORTED 2109 /* png_image_free is used by the write code but not exported */ 2110 PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY); 2111 #endif /* !SIMPLIFIED_READ */ 2112 2113 #endif /* SIMPLIFIED READ/WRITE */ 2114 2115 /* These are initialization functions for hardware specific PNG filter 2116 * optimizations; list these here then select the appropriate one at compile 2117 * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined 2118 * the generic code is used. 2119 */ 2120 #ifdef PNG_FILTER_OPTIMIZATIONS 2121 PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr, 2122 unsigned int bpp), PNG_EMPTY); 2123 /* Just declare the optimization that will be used */ 2124 #else 2125 /* List *all* the possible optimizations here - this branch is required if 2126 * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in 2127 * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing. 2128 */ 2129 # if PNG_ARM_NEON_OPT > 0 2130 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon, 2131 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2132 #endif 2133 2134 #if PNG_MIPS_MSA_OPT > 0 2135 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_msa, 2136 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2137 #endif 2138 2139 # if PNG_INTEL_SSE_IMPLEMENTATION > 0 2140 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_sse2, 2141 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2142 # endif 2143 #endif 2144 2145 PNG_INTERNAL_FUNCTION(png_uint_32, png_check_keyword, (png_structrp png_ptr, 2146 png_const_charp key, png_bytep new_key), PNG_EMPTY); 2147 2148 #if PNG_ARM_NEON_IMPLEMENTATION == 1 2149 PNG_INTERNAL_FUNCTION(void, 2150 png_riffle_palette_neon, 2151 (png_structrp), 2152 PNG_EMPTY); 2153 PNG_INTERNAL_FUNCTION(int, 2154 png_do_expand_palette_rgba8_neon, 2155 (png_structrp, 2156 png_row_infop, 2157 png_const_bytep, 2158 const png_bytepp, 2159 const png_bytepp), 2160 PNG_EMPTY); 2161 PNG_INTERNAL_FUNCTION(int, 2162 png_do_expand_palette_rgb8_neon, 2163 (png_structrp, 2164 png_row_infop, 2165 png_const_bytep, 2166 const png_bytepp, 2167 const png_bytepp), 2168 PNG_EMPTY); 2169 #endif 2170 2171 /* Maintainer: Put new private prototypes here ^ */ 2172 2173 #include "pngdebug.h" 2174 2175 #ifdef __cplusplus 2176 } 2177 #endif 2178 2179 #endif /* PNG_VERSION_INFO_ONLY */ 2180 #endif /* PNGPRIV_H */ 2181