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 * Last changed in libpng 1.6.32 [August 24, 2017] 33 * Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson 34 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) 35 * (Version 0.88 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 # define PNG_ARM_NEON_IMPLEMENTATION 2 206 # endif /* __ARM_NEON__ */ 207 # endif /* !PNG_ARM_NEON_IMPLEMENTATION */ 208 209 # ifndef PNG_ARM_NEON_IMPLEMENTATION 210 /* Use the intrinsics code by default. */ 211 # define PNG_ARM_NEON_IMPLEMENTATION 1 212 # endif 213 #endif /* PNG_ARM_NEON_OPT > 0 */ 214 215 #ifndef PNG_MIPS_MSA_OPT 216 # if defined(__mips_msa) && (__mips_isa_rev >= 5) && defined(PNG_ALIGNED_MEMORY_SUPPORTED) 217 # define PNG_MIPS_MSA_OPT 2 218 # else 219 # define PNG_MIPS_MSA_OPT 0 220 # endif 221 #endif 222 223 #ifndef PNG_POWERPC_VSX_OPT 224 # if defined(__PPC64__) && defined(__ALTIVEC__) && defined(__VSX__) 225 # define PNG_POWERPC_VSX_OPT 2 226 # else 227 # define PNG_POWERPC_VSX_OPT 0 228 # endif 229 #endif 230 231 #ifndef PNG_INTEL_SSE_OPT 232 # ifdef PNG_INTEL_SSE 233 /* Only check for SSE if the build configuration has been modified to 234 * enable SSE optimizations. This means that these optimizations will 235 * be off by default. See contrib/intel for more details. 236 */ 237 # if defined(__SSE4_1__) || defined(__AVX__) || defined(__SSSE3__) || \ 238 defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \ 239 (defined(_M_IX86_FP) && _M_IX86_FP >= 2) 240 # define PNG_INTEL_SSE_OPT 1 241 # endif 242 # endif 243 #endif 244 245 #if PNG_INTEL_SSE_OPT > 0 246 # ifndef PNG_INTEL_SSE_IMPLEMENTATION 247 # if defined(__SSE4_1__) || defined(__AVX__) 248 /* We are not actually using AVX, but checking for AVX is the best 249 way we can detect SSE4.1 and SSSE3 on MSVC. 250 */ 251 # define PNG_INTEL_SSE_IMPLEMENTATION 3 252 # elif defined(__SSSE3__) 253 # define PNG_INTEL_SSE_IMPLEMENTATION 2 254 # elif defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \ 255 (defined(_M_IX86_FP) && _M_IX86_FP >= 2) 256 # define PNG_INTEL_SSE_IMPLEMENTATION 1 257 # else 258 # define PNG_INTEL_SSE_IMPLEMENTATION 0 259 # endif 260 # endif 261 262 # if PNG_INTEL_SSE_IMPLEMENTATION > 0 263 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_sse2 264 # endif 265 #endif 266 267 #if PNG_MIPS_MSA_OPT > 0 268 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_msa 269 # ifndef PNG_MIPS_MSA_IMPLEMENTATION 270 # if defined(__mips_msa) 271 # if defined(__clang__) 272 # elif defined(__GNUC__) 273 # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7) 274 # define PNG_MIPS_MSA_IMPLEMENTATION 2 275 # endif /* no GNUC support */ 276 # endif /* __GNUC__ */ 277 # else /* !defined __mips_msa */ 278 # define PNG_MIPS_MSA_IMPLEMENTATION 2 279 # endif /* __mips_msa */ 280 # endif /* !PNG_MIPS_MSA_IMPLEMENTATION */ 281 282 # ifndef PNG_MIPS_MSA_IMPLEMENTATION 283 # define PNG_MIPS_MSA_IMPLEMENTATION 1 284 # endif 285 #endif /* PNG_MIPS_MSA_OPT > 0 */ 286 287 #ifdef PNG_POWERPC_VSX_API_SUPPORTED 288 #if PNG_POWERPC_VSX_OPT > 0 289 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_vsx 290 # define PNG_POWERPC_VSX_IMPLEMENTATION 1 291 #endif 292 #endif 293 294 /* Is this a build of a DLL where compilation of the object modules requires 295 * different preprocessor settings to those required for a simple library? If 296 * so PNG_BUILD_DLL must be set. 297 * 298 * If libpng is used inside a DLL but that DLL does not export the libpng APIs 299 * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a 300 * static library of libpng then link the DLL against that. 301 */ 302 #ifndef PNG_BUILD_DLL 303 # ifdef DLL_EXPORT 304 /* This is set by libtool when files are compiled for a DLL; libtool 305 * always compiles twice, even on systems where it isn't necessary. Set 306 * PNG_BUILD_DLL in case it is necessary: 307 */ 308 # define PNG_BUILD_DLL 309 # else 310 # ifdef _WINDLL 311 /* This is set by the Microsoft Visual Studio IDE in projects that 312 * build a DLL. It can't easily be removed from those projects (it 313 * isn't visible in the Visual Studio UI) so it is a fairly reliable 314 * indication that PNG_IMPEXP needs to be set to the DLL export 315 * attributes. 316 */ 317 # define PNG_BUILD_DLL 318 # else 319 # ifdef __DLL__ 320 /* This is set by the Borland C system when compiling for a DLL 321 * (as above.) 322 */ 323 # define PNG_BUILD_DLL 324 # else 325 /* Add additional compiler cases here. */ 326 # endif 327 # endif 328 # endif 329 #endif /* Setting PNG_BUILD_DLL if required */ 330 331 /* See pngconf.h for more details: the builder of the library may set this on 332 * the command line to the right thing for the specific compilation system or it 333 * may be automagically set above (at present we know of no system where it does 334 * need to be set on the command line.) 335 * 336 * PNG_IMPEXP must be set here when building the library to prevent pngconf.h 337 * setting it to the "import" setting for a DLL build. 338 */ 339 #ifndef PNG_IMPEXP 340 # ifdef PNG_BUILD_DLL 341 # define PNG_IMPEXP PNG_DLL_EXPORT 342 # else 343 /* Not building a DLL, or the DLL doesn't require specific export 344 * definitions. 345 */ 346 # define PNG_IMPEXP 347 # endif 348 #endif 349 350 /* No warnings for private or deprecated functions in the build: */ 351 #ifndef PNG_DEPRECATED 352 # define PNG_DEPRECATED 353 #endif 354 #ifndef PNG_PRIVATE 355 # define PNG_PRIVATE 356 #endif 357 358 /* Symbol preprocessing support. 359 * 360 * To enable listing global, but internal, symbols the following macros should 361 * always be used to declare an extern data or function object in this file. 362 */ 363 #ifndef PNG_INTERNAL_DATA 364 # define PNG_INTERNAL_DATA(type, name, array) PNG_LINKAGE_DATA type name array 365 #endif 366 367 #ifndef PNG_INTERNAL_FUNCTION 368 # define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\ 369 PNG_LINKAGE_FUNCTION PNG_FUNCTION(type, name, args, PNG_EMPTY attributes) 370 #endif 371 372 #ifndef PNG_INTERNAL_CALLBACK 373 # define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\ 374 PNG_LINKAGE_CALLBACK PNG_FUNCTION(type, (PNGCBAPI name), args,\ 375 PNG_EMPTY attributes) 376 #endif 377 378 /* If floating or fixed point APIs are disabled they may still be compiled 379 * internally. To handle this make sure they are declared as the appropriate 380 * internal extern function (otherwise the symbol prefixing stuff won't work and 381 * the functions will be used without definitions.) 382 * 383 * NOTE: although all the API functions are declared here they are not all 384 * actually built! Because the declarations are still made it is necessary to 385 * fake out types that they depend on. 386 */ 387 #ifndef PNG_FP_EXPORT 388 # ifndef PNG_FLOATING_POINT_SUPPORTED 389 # define PNG_FP_EXPORT(ordinal, type, name, args)\ 390 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 391 # ifndef PNG_VERSION_INFO_ONLY 392 typedef struct png_incomplete png_double; 393 typedef png_double* png_doublep; 394 typedef const png_double* png_const_doublep; 395 typedef png_double** png_doublepp; 396 # endif 397 # endif 398 #endif 399 #ifndef PNG_FIXED_EXPORT 400 # ifndef PNG_FIXED_POINT_SUPPORTED 401 # define PNG_FIXED_EXPORT(ordinal, type, name, args)\ 402 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 403 # endif 404 #endif 405 406 #include "png.h" 407 408 /* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */ 409 #ifndef PNG_DLL_EXPORT 410 # define PNG_DLL_EXPORT 411 #endif 412 413 /* This is a global switch to set the compilation for an installed system 414 * (a release build). It can be set for testing debug builds to ensure that 415 * they will compile when the build type is switched to RC or STABLE, the 416 * default is just to use PNG_LIBPNG_BUILD_BASE_TYPE. Set this in CPPFLAGS 417 * with either: 418 * 419 * -DPNG_RELEASE_BUILD Turns on the release compile path 420 * -DPNG_RELEASE_BUILD=0 Turns it off 421 * or in your pngusr.h with 422 * #define PNG_RELEASE_BUILD=1 Turns on the release compile path 423 * #define PNG_RELEASE_BUILD=0 Turns it off 424 */ 425 #ifndef PNG_RELEASE_BUILD 426 # define PNG_RELEASE_BUILD (PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC) 427 #endif 428 429 /* SECURITY and SAFETY: 430 * 431 * libpng is built with support for internal limits on image dimensions and 432 * memory usage. These are documented in scripts/pnglibconf.dfa of the 433 * source and recorded in the machine generated header file pnglibconf.h. 434 */ 435 436 /* If you are running on a machine where you cannot allocate more 437 * than 64K of memory at once, uncomment this. While libpng will not 438 * normally need that much memory in a chunk (unless you load up a very 439 * large file), zlib needs to know how big of a chunk it can use, and 440 * libpng thus makes sure to check any memory allocation to verify it 441 * will fit into memory. 442 * 443 * zlib provides 'MAXSEG_64K' which, if defined, indicates the 444 * same limit and pngconf.h (already included) sets the limit 445 * if certain operating systems are detected. 446 */ 447 #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K) 448 # define PNG_MAX_MALLOC_64K 449 #endif 450 451 #ifndef PNG_UNUSED 452 /* Unused formal parameter warnings are silenced using the following macro 453 * which is expected to have no bad effects on performance (optimizing 454 * compilers will probably remove it entirely). Note that if you replace 455 * it with something other than whitespace, you must include the terminating 456 * semicolon. 457 */ 458 # define PNG_UNUSED(param) (void)param; 459 #endif 460 461 /* Just a little check that someone hasn't tried to define something 462 * contradictory. 463 */ 464 #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K) 465 # undef PNG_ZBUF_SIZE 466 # define PNG_ZBUF_SIZE 65536L 467 #endif 468 469 /* If warnings or errors are turned off the code is disabled or redirected here. 470 * From 1.5.4 functions have been added to allow very limited formatting of 471 * error and warning messages - this code will also be disabled here. 472 */ 473 #ifdef PNG_WARNINGS_SUPPORTED 474 # define PNG_WARNING_PARAMETERS(p) png_warning_parameters p; 475 #else 476 # define png_warning_parameter(p,number,string) ((void)0) 477 # define png_warning_parameter_unsigned(p,number,format,value) ((void)0) 478 # define png_warning_parameter_signed(p,number,format,value) ((void)0) 479 # define png_formatted_warning(pp,p,message) ((void)(pp)) 480 # define PNG_WARNING_PARAMETERS(p) 481 #endif 482 #ifndef PNG_ERROR_TEXT_SUPPORTED 483 # define png_fixed_error(s1,s2) png_err(s1) 484 #endif 485 486 /* Some fixed point APIs are still required even if not exported because 487 * they get used by the corresponding floating point APIs. This magic 488 * deals with this: 489 */ 490 #ifdef PNG_FIXED_POINT_SUPPORTED 491 # define PNGFAPI PNGAPI 492 #else 493 # define PNGFAPI /* PRIVATE */ 494 #endif 495 496 #ifndef PNG_VERSION_INFO_ONLY 497 /* Other defines specific to compilers can go here. Try to keep 498 * them inside an appropriate ifdef/endif pair for portability. 499 */ 500 501 /* C allows up-casts from (void*) to any pointer and (const void*) to any 502 * pointer to a const object. C++ regards this as a type error and requires an 503 * explicit, static, cast and provides the static_cast<> rune to ensure that 504 * const is not cast away. 505 */ 506 #ifdef __cplusplus 507 # define png_voidcast(type, value) static_cast<type>(value) 508 # define png_constcast(type, value) const_cast<type>(value) 509 # define png_aligncast(type, value) \ 510 static_cast<type>(static_cast<void*>(value)) 511 # define png_aligncastconst(type, value) \ 512 static_cast<type>(static_cast<const void*>(value)) 513 #else 514 # define png_voidcast(type, value) (value) 515 # ifdef _WIN64 516 # ifdef __GNUC__ 517 typedef unsigned long long png_ptruint; 518 # else 519 typedef unsigned __int64 png_ptruint; 520 # endif 521 # else 522 typedef unsigned long png_ptruint; 523 # endif 524 # define png_constcast(type, value) ((type)(png_ptruint)(const void*)(value)) 525 # define png_aligncast(type, value) ((void*)(value)) 526 # define png_aligncastconst(type, value) ((const void*)(value)) 527 #endif /* __cplusplus */ 528 529 #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\ 530 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) 531 /* png.c requires the following ANSI-C constants if the conversion of 532 * floating point to ASCII is implemented therein: 533 * 534 * DBL_DIG Maximum number of decimal digits (can be set to any constant) 535 * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value) 536 * DBL_MAX Maximum floating point number (can be set to an arbitrary value) 537 */ 538 # include <float.h> 539 540 # if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \ 541 defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC) 542 /* We need to check that <math.h> hasn't already been included earlier 543 * as it seems it doesn't agree with <fp.h>, yet we should really use 544 * <fp.h> if possible. 545 */ 546 # if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__) 547 # include <fp.h> 548 # endif 549 # else 550 # include <math.h> 551 # endif 552 # if defined(_AMIGA) && defined(__SASC) && defined(_M68881) 553 /* Amiga SAS/C: We must include builtin FPU functions when compiling using 554 * MATH=68881 555 */ 556 # include <m68881.h> 557 # endif 558 #endif 559 560 /* This provides the non-ANSI (far) memory allocation routines. */ 561 #if defined(__TURBOC__) && defined(__MSDOS__) 562 # include <mem.h> 563 # include <alloc.h> 564 #endif 565 566 #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \ 567 defined(_WIN32) || defined(__WIN32__) 568 # include <windows.h> /* defines _WINDOWS_ macro */ 569 #endif 570 #endif /* PNG_VERSION_INFO_ONLY */ 571 572 /* Moved here around 1.5.0beta36 from pngconf.h */ 573 /* Users may want to use these so they are not private. Any library 574 * functions that are passed far data must be model-independent. 575 */ 576 577 /* Memory model/platform independent fns */ 578 #ifndef PNG_ABORT 579 # ifdef _WINDOWS_ 580 # define PNG_ABORT() ExitProcess(0) 581 # else 582 # define PNG_ABORT() abort() 583 # endif 584 #endif 585 586 /* These macros may need to be architecture dependent. */ 587 #define PNG_ALIGN_NONE 0 /* do not use data alignment */ 588 #define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */ 589 #ifdef offsetof 590 # define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */ 591 #else 592 # define PNG_ALIGN_OFFSET -1 /* prevent the use of this */ 593 #endif 594 #define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */ 595 596 #ifndef PNG_ALIGN_TYPE 597 /* Default to using aligned access optimizations and requiring alignment to a 598 * multiple of the data type size. Override in a compiler specific fashion 599 * if necessary by inserting tests here: 600 */ 601 # define PNG_ALIGN_TYPE PNG_ALIGN_SIZE 602 #endif 603 604 #if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE 605 /* This is used because in some compiler implementations non-aligned 606 * structure members are supported, so the offsetof approach below fails. 607 * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access 608 * is good for performance. Do not do this unless you have tested the result 609 * and understand it. 610 */ 611 # define png_alignof(type) (sizeof (type)) 612 #else 613 # if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET 614 # define png_alignof(type) offsetof(struct{char c; type t;}, t) 615 # else 616 # if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS 617 # define png_alignof(type) (1) 618 # endif 619 /* Else leave png_alignof undefined to prevent use thereof */ 620 # endif 621 #endif 622 623 /* This implicitly assumes alignment is always to a power of 2. */ 624 #ifdef png_alignof 625 # define png_isaligned(ptr, type)\ 626 (((type)((const char*)ptr-(const char*)0) & \ 627 (type)(png_alignof(type)-1)) == 0) 628 #else 629 # define png_isaligned(ptr, type) 0 630 #endif 631 632 /* End of memory model/platform independent support */ 633 /* End of 1.5.0beta36 move from pngconf.h */ 634 635 /* CONSTANTS and UTILITY MACROS 636 * These are used internally by libpng and not exposed in the API 637 */ 638 639 /* Various modes of operation. Note that after an init, mode is set to 640 * zero automatically when the structure is created. Three of these 641 * are defined in png.h because they need to be visible to applications 642 * that call png_set_unknown_chunk(). 643 */ 644 /* #define PNG_HAVE_IHDR 0x01U (defined in png.h) */ 645 /* #define PNG_HAVE_PLTE 0x02U (defined in png.h) */ 646 #define PNG_HAVE_IDAT 0x04U 647 /* #define PNG_AFTER_IDAT 0x08U (defined in png.h) */ 648 #define PNG_HAVE_IEND 0x10U 649 /* 0x20U (unused) */ 650 /* 0x40U (unused) */ 651 /* 0x80U (unused) */ 652 #define PNG_HAVE_CHUNK_HEADER 0x100U 653 #define PNG_WROTE_tIME 0x200U 654 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400U 655 #define PNG_BACKGROUND_IS_GRAY 0x800U 656 #define PNG_HAVE_PNG_SIGNATURE 0x1000U 657 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000U /* Have another chunk after IDAT */ 658 /* 0x4000U (unused) */ 659 #define PNG_IS_READ_STRUCT 0x8000U /* Else is a write struct */ 660 661 /* Flags for the transformations the PNG library does on the image data */ 662 #define PNG_BGR 0x0001U 663 #define PNG_INTERLACE 0x0002U 664 #define PNG_PACK 0x0004U 665 #define PNG_SHIFT 0x0008U 666 #define PNG_SWAP_BYTES 0x0010U 667 #define PNG_INVERT_MONO 0x0020U 668 #define PNG_QUANTIZE 0x0040U 669 #define PNG_COMPOSE 0x0080U /* Was PNG_BACKGROUND */ 670 #define PNG_BACKGROUND_EXPAND 0x0100U 671 #define PNG_EXPAND_16 0x0200U /* Added to libpng 1.5.2 */ 672 #define PNG_16_TO_8 0x0400U /* Becomes 'chop' in 1.5.4 */ 673 #define PNG_RGBA 0x0800U 674 #define PNG_EXPAND 0x1000U 675 #define PNG_GAMMA 0x2000U 676 #define PNG_GRAY_TO_RGB 0x4000U 677 #define PNG_FILLER 0x8000U 678 #define PNG_PACKSWAP 0x10000U 679 #define PNG_SWAP_ALPHA 0x20000U 680 #define PNG_STRIP_ALPHA 0x40000U 681 #define PNG_INVERT_ALPHA 0x80000U 682 #define PNG_USER_TRANSFORM 0x100000U 683 #define PNG_RGB_TO_GRAY_ERR 0x200000U 684 #define PNG_RGB_TO_GRAY_WARN 0x400000U 685 #define PNG_RGB_TO_GRAY 0x600000U /* two bits, RGB_TO_GRAY_ERR|WARN */ 686 #define PNG_ENCODE_ALPHA 0x800000U /* Added to libpng-1.5.4 */ 687 #define PNG_ADD_ALPHA 0x1000000U /* Added to libpng-1.2.7 */ 688 #define PNG_EXPAND_tRNS 0x2000000U /* Added to libpng-1.2.9 */ 689 #define PNG_SCALE_16_TO_8 0x4000000U /* Added to libpng-1.5.4 */ 690 /* 0x8000000U unused */ 691 /* 0x10000000U unused */ 692 /* 0x20000000U unused */ 693 /* 0x40000000U unused */ 694 /* Flags for png_create_struct */ 695 #define PNG_STRUCT_PNG 0x0001U 696 #define PNG_STRUCT_INFO 0x0002U 697 698 /* Flags for the png_ptr->flags rather than declaring a byte for each one */ 699 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001U 700 #define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002U /* Added to libpng-1.6.0 */ 701 /* 0x0004U unused */ 702 #define PNG_FLAG_ZSTREAM_ENDED 0x0008U /* Added to libpng-1.6.0 */ 703 /* 0x0010U unused */ 704 /* 0x0020U unused */ 705 #define PNG_FLAG_ROW_INIT 0x0040U 706 #define PNG_FLAG_FILLER_AFTER 0x0080U 707 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100U 708 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200U 709 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400U 710 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800U 711 #define PNG_FLAG_ASSUME_sRGB 0x1000U /* Added to libpng-1.5.4 */ 712 #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000U /* Added to libpng-1.5.4 */ 713 #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000U /* Added to libpng-1.5.4 */ 714 /* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000U */ 715 /* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000U */ 716 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000U 717 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000U 718 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000U 719 #define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000U /* Added to libpng-1.4.0 */ 720 #define PNG_FLAG_APP_WARNINGS_WARN 0x200000U /* Added to libpng-1.6.0 */ 721 #define PNG_FLAG_APP_ERRORS_WARN 0x400000U /* Added to libpng-1.6.0 */ 722 /* 0x800000U unused */ 723 /* 0x1000000U unused */ 724 /* 0x2000000U unused */ 725 /* 0x4000000U unused */ 726 /* 0x8000000U unused */ 727 /* 0x10000000U unused */ 728 /* 0x20000000U unused */ 729 /* 0x40000000U unused */ 730 731 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 732 PNG_FLAG_CRC_ANCILLARY_NOWARN) 733 734 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 735 PNG_FLAG_CRC_CRITICAL_IGNORE) 736 737 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 738 PNG_FLAG_CRC_CRITICAL_MASK) 739 740 /* Save typing and make code easier to understand */ 741 742 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 743 abs((int)((c1).green) - (int)((c2).green)) + \ 744 abs((int)((c1).blue) - (int)((c2).blue))) 745 746 /* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255 747 * by dividing by 257 *with rounding*. This macro is exact for the given range. 748 * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the 749 * macro were established by experiment (modifying the added value). The macro 750 * has a second variant that takes a value already scaled by 255 and divides by 751 * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it 752 * only gives off-by-one errors and only for 0.5% (1 in 200) of the values. 753 */ 754 #define PNG_DIV65535(v24) (((v24) + 32895) >> 16) 755 #define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255) 756 757 /* Added to libpng-1.2.6 JB */ 758 #define PNG_ROWBYTES(pixel_bits, width) \ 759 ((pixel_bits) >= 8 ? \ 760 ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \ 761 (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) ) 762 763 /* This returns the number of trailing bits in the last byte of a row, 0 if the 764 * last byte is completely full of pixels. It is, in principle, (pixel_bits x 765 * width) % 8, but that would overflow for large 'width'. The second macro is 766 * the same except that it returns the number of unused bits in the last byte; 767 * (8-TRAILBITS), but 0 when TRAILBITS is 0. 768 * 769 * NOTE: these macros are intended to be self-evidently correct and never 770 * overflow on the assumption that pixel_bits is in the range 0..255. The 771 * arguments are evaluated only once and they can be signed (e.g. as a result of 772 * the integral promotions). The result of the expression always has type 773 * (png_uint_32), however the compiler always knows it is in the range 0..7. 774 */ 775 #define PNG_TRAILBITS(pixel_bits, width) \ 776 (((pixel_bits) * ((width) % (png_uint_32)8)) % 8) 777 778 #define PNG_PADBITS(pixel_bits, width) \ 779 ((8 - PNG_TRAILBITS(pixel_bits, width)) % 8) 780 781 /* PNG_OUT_OF_RANGE returns true if value is outside the range 782 * ideal-delta..ideal+delta. Each argument is evaluated twice. 783 * "ideal" and "delta" should be constants, normally simple 784 * integers, "value" a variable. Added to libpng-1.2.6 JB 785 */ 786 #define PNG_OUT_OF_RANGE(value, ideal, delta) \ 787 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 788 789 /* Conversions between fixed and floating point, only defined if 790 * required (to make sure the code doesn't accidentally use float 791 * when it is supposedly disabled.) 792 */ 793 #ifdef PNG_FLOATING_POINT_SUPPORTED 794 /* The floating point conversion can't overflow, though it can and 795 * does lose accuracy relative to the original fixed point value. 796 * In practice this doesn't matter because png_fixed_point only 797 * stores numbers with very low precision. The png_ptr and s 798 * arguments are unused by default but are there in case error 799 * checking becomes a requirement. 800 */ 801 #define png_float(png_ptr, fixed, s) (.00001 * (fixed)) 802 803 /* The fixed point conversion performs range checking and evaluates 804 * its argument multiple times, so must be used with care. The 805 * range checking uses the PNG specification values for a signed 806 * 32-bit fixed point value except that the values are deliberately 807 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly 808 * (2^31-1) * 100000). 's' is a string that describes the value being 809 * converted. 810 * 811 * NOTE: this macro will raise a png_error if the range check fails, 812 * therefore it is normally only appropriate to use this on values 813 * that come from API calls or other sources where an out of range 814 * error indicates a programming error, not a data error! 815 * 816 * NOTE: by default this is off - the macro is not used - because the 817 * function call saves a lot of code. 818 */ 819 #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED 820 #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\ 821 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0)) 822 #endif 823 /* else the corresponding function is defined below, inside the scope of the 824 * cplusplus test. 825 */ 826 #endif 827 828 /* Constants for known chunk types. If you need to add a chunk, define the name 829 * here. For historical reasons these constants have the form png_<name>; i.e. 830 * the prefix is lower case. Please use decimal values as the parameters to 831 * match the ISO PNG specification and to avoid relying on the C locale 832 * interpretation of character values. 833 * 834 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values 835 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string 836 * to be generated if required. 837 * 838 * PNG_32b correctly produces a value shifted by up to 24 bits, even on 839 * architectures where (int) is only 16 bits. 840 */ 841 #define PNG_32b(b,s) ((png_uint_32)(b) << (s)) 842 #define PNG_U32(b1,b2,b3,b4) \ 843 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0)) 844 845 /* Constants for known chunk types. 846 * 847 * MAINTAINERS: If you need to add a chunk, define the name here. 848 * For historical reasons these constants have the form png_<name>; i.e. 849 * the prefix is lower case. Please use decimal values as the parameters to 850 * match the ISO PNG specification and to avoid relying on the C locale 851 * interpretation of character values. Please keep the list sorted. 852 * 853 * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk 854 * type. In fact the specification does not express chunk types this way, 855 * however using a 32-bit value means that the chunk type can be read from the 856 * stream using exactly the same code as used for a 32-bit unsigned value and 857 * can be examined far more efficiently (using one arithmetic compare). 858 * 859 * Prior to 1.5.6 the chunk type constants were expressed as C strings. The 860 * libpng API still uses strings for 'unknown' chunks and a macro, 861 * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice 862 * that for portable code numeric values must still be used; the string "IHDR" 863 * is not portable and neither is PNG_U32('I', 'H', 'D', 'R'). 864 * 865 * In 1.7.0 the definitions will be made public in png.h to avoid having to 866 * duplicate the same definitions in application code. 867 */ 868 #define png_IDAT PNG_U32( 73, 68, 65, 84) 869 #define png_IEND PNG_U32( 73, 69, 78, 68) 870 #define png_IHDR PNG_U32( 73, 72, 68, 82) 871 #define png_PLTE PNG_U32( 80, 76, 84, 69) 872 #define png_bKGD PNG_U32( 98, 75, 71, 68) 873 #define png_cHRM PNG_U32( 99, 72, 82, 77) 874 #define png_eXIf PNG_U32(101, 88, 73, 102) /* registered July 2017 */ 875 #define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */ 876 #define png_gAMA PNG_U32(103, 65, 77, 65) 877 #define png_gIFg PNG_U32(103, 73, 70, 103) 878 #define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */ 879 #define png_gIFx PNG_U32(103, 73, 70, 120) 880 #define png_hIST PNG_U32(104, 73, 83, 84) 881 #define png_iCCP PNG_U32(105, 67, 67, 80) 882 #define png_iTXt PNG_U32(105, 84, 88, 116) 883 #define png_oFFs PNG_U32(111, 70, 70, 115) 884 #define png_pCAL PNG_U32(112, 67, 65, 76) 885 #define png_pHYs PNG_U32(112, 72, 89, 115) 886 #define png_sBIT PNG_U32(115, 66, 73, 84) 887 #define png_sCAL PNG_U32(115, 67, 65, 76) 888 #define png_sPLT PNG_U32(115, 80, 76, 84) 889 #define png_sRGB PNG_U32(115, 82, 71, 66) 890 #define png_sTER PNG_U32(115, 84, 69, 82) 891 #define png_tEXt PNG_U32(116, 69, 88, 116) 892 #define png_tIME PNG_U32(116, 73, 77, 69) 893 #define png_tRNS PNG_U32(116, 82, 78, 83) 894 #define png_zTXt PNG_U32(122, 84, 88, 116) 895 896 /* The following will work on (signed char*) strings, whereas the get_uint_32 897 * macro will fail on top-bit-set values because of the sign extension. 898 */ 899 #define PNG_CHUNK_FROM_STRING(s)\ 900 PNG_U32(0xff & (s)[0], 0xff & (s)[1], 0xff & (s)[2], 0xff & (s)[3]) 901 902 /* This uses (char), not (png_byte) to avoid warnings on systems where (char) is 903 * signed and the argument is a (char[]) This macro will fail miserably on 904 * systems where (char) is more than 8 bits. 905 */ 906 #define PNG_STRING_FROM_CHUNK(s,c)\ 907 (void)(((char*)(s))[0]=(char)(((c)>>24) & 0xff), \ 908 ((char*)(s))[1]=(char)(((c)>>16) & 0xff),\ 909 ((char*)(s))[2]=(char)(((c)>>8) & 0xff), \ 910 ((char*)(s))[3]=(char)((c & 0xff))) 911 912 /* Do the same but terminate with a null character. */ 913 #define PNG_CSTRING_FROM_CHUNK(s,c)\ 914 (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0) 915 916 /* Test on flag values as defined in the spec (section 5.4): */ 917 #define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29)) 918 #define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c)) 919 #define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21)) 920 #define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13)) 921 #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5)) 922 923 /* Gamma values (new at libpng-1.5.4): */ 924 #define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */ 925 #define PNG_GAMMA_MAC_INVERSE 65909 926 #define PNG_GAMMA_sRGB_INVERSE 45455 927 928 /* Almost everything below is C specific; the #defines above can be used in 929 * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot. 930 */ 931 #ifndef PNG_VERSION_INFO_ONLY 932 933 #include "pngstruct.h" 934 #include "pnginfo.h" 935 936 /* Validate the include paths - the include path used to generate pnglibconf.h 937 * must match that used in the build, or we must be using pnglibconf.h.prebuilt: 938 */ 939 #if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM 940 # error ZLIB_VERNUM != PNG_ZLIB_VERNUM \ 941 "-I (include path) error: see the notes in pngpriv.h" 942 /* This means that when pnglibconf.h was built the copy of zlib.h that it 943 * used is not the same as the one being used here. Because the build of 944 * libpng makes decisions to use inflateInit2 and inflateReset2 based on the 945 * zlib version number and because this affects handling of certain broken 946 * PNG files the -I directives must match. 947 * 948 * The most likely explanation is that you passed a -I in CFLAGS. This will 949 * not work; all the preprocessor directories and in particular all the -I 950 * directives must be in CPPFLAGS. 951 */ 952 #endif 953 954 /* This is used for 16-bit gamma tables -- only the top level pointers are 955 * const; this could be changed: 956 */ 957 typedef const png_uint_16p * png_const_uint_16pp; 958 959 /* Added to libpng-1.5.7: sRGB conversion tables */ 960 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 961 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 962 #ifdef PNG_SIMPLIFIED_READ_SUPPORTED 963 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]); 964 /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value, 965 * 0..65535. This table gives the closest 16-bit answers (no errors). 966 */ 967 #endif 968 969 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]); 970 PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]); 971 972 #define PNG_sRGB_FROM_LINEAR(linear) \ 973 ((png_byte)(0xff & ((png_sRGB_base[(linear)>>15] \ 974 + ((((linear) & 0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8))) 975 /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB 976 * encoded value with maximum error 0.646365. Note that the input is not a 977 * 16-bit value; it has been multiplied by 255! */ 978 #endif /* SIMPLIFIED_READ/WRITE */ 979 980 981 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 982 #ifdef __cplusplus 983 extern "C" { 984 #endif /* __cplusplus */ 985 986 /* Internal functions; these are not exported from a DLL however because they 987 * are used within several of the C source files they have to be C extern. 988 * 989 * All of these functions must be declared with PNG_INTERNAL_FUNCTION. 990 */ 991 992 /* Zlib support */ 993 #define PNG_UNEXPECTED_ZLIB_RETURN (-7) 994 PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret), 995 PNG_EMPTY); 996 /* Used by the zlib handling functions to ensure that z_stream::msg is always 997 * set before they return. 998 */ 999 1000 #ifdef PNG_WRITE_SUPPORTED 1001 PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr, 1002 png_compression_bufferp *list),PNG_EMPTY); 1003 /* Free the buffer list used by the compressed write code. */ 1004 #endif 1005 1006 #if defined(PNG_FLOATING_POINT_SUPPORTED) && \ 1007 !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \ 1008 (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \ 1009 defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \ 1010 defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \ 1011 (defined(PNG_sCAL_SUPPORTED) && \ 1012 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)) 1013 PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr, 1014 double fp, png_const_charp text),PNG_EMPTY); 1015 #endif 1016 1017 /* Check the user version string for compatibility, returns false if the version 1018 * numbers aren't compatible. 1019 */ 1020 PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr, 1021 png_const_charp user_png_ver),PNG_EMPTY); 1022 1023 /* Internal base allocator - no messages, NULL on failure to allocate. This 1024 * does, however, call the application provided allocator and that could call 1025 * png_error (although that would be a bug in the application implementation.) 1026 */ 1027 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr, 1028 png_alloc_size_t size),PNG_ALLOCATED); 1029 1030 #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\ 1031 defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED) 1032 /* Internal array allocator, outputs no error or warning messages on failure, 1033 * just returns NULL. 1034 */ 1035 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr, 1036 int nelements, size_t element_size),PNG_ALLOCATED); 1037 1038 /* The same but an existing array is extended by add_elements. This function 1039 * also memsets the new elements to 0 and copies the old elements. The old 1040 * array is not freed or altered. 1041 */ 1042 PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr, 1043 png_const_voidp array, int old_elements, int add_elements, 1044 size_t element_size),PNG_ALLOCATED); 1045 #endif /* text, sPLT or unknown chunks */ 1046 1047 /* Magic to create a struct when there is no struct to call the user supplied 1048 * memory allocators. Because error handling has not been set up the memory 1049 * handlers can't safely call png_error, but this is an obscure and undocumented 1050 * restriction so libpng has to assume that the 'free' handler, at least, might 1051 * call png_error. 1052 */ 1053 PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct, 1054 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, 1055 png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, 1056 png_free_ptr free_fn),PNG_ALLOCATED); 1057 1058 /* Free memory from internal libpng struct */ 1059 PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr), 1060 PNG_EMPTY); 1061 1062 /* Free an allocated jmp_buf (always succeeds) */ 1063 PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY); 1064 1065 /* Function to allocate memory for zlib. PNGAPI is disallowed. */ 1066 PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size), 1067 PNG_ALLOCATED); 1068 1069 /* Function to free memory for zlib. PNGAPI is disallowed. */ 1070 PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY); 1071 1072 /* Next four functions are used internally as callbacks. PNGCBAPI is required 1073 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to 1074 * PNGCBAPI at 1.5.0 1075 */ 1076 1077 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr, 1078 png_bytep data, png_size_t length),PNG_EMPTY); 1079 1080 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1081 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr, 1082 png_bytep buffer, png_size_t length),PNG_EMPTY); 1083 #endif 1084 1085 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr, 1086 png_bytep data, png_size_t length),PNG_EMPTY); 1087 1088 #ifdef PNG_WRITE_FLUSH_SUPPORTED 1089 # ifdef PNG_STDIO_SUPPORTED 1090 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr), 1091 PNG_EMPTY); 1092 # endif 1093 #endif 1094 1095 /* Reset the CRC variable */ 1096 PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY); 1097 1098 /* Write the "data" buffer to whatever output you are using */ 1099 PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr, 1100 png_const_bytep data, png_size_t length),PNG_EMPTY); 1101 1102 /* Read and check the PNG file signature */ 1103 PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr, 1104 png_inforp info_ptr),PNG_EMPTY); 1105 1106 /* Read the chunk header (length + type name) */ 1107 PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr), 1108 PNG_EMPTY); 1109 1110 /* Read data from whatever input you are using into the "data" buffer */ 1111 PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data, 1112 png_size_t length),PNG_EMPTY); 1113 1114 /* Read bytes into buf, and update png_ptr->crc */ 1115 PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf, 1116 png_uint_32 length),PNG_EMPTY); 1117 1118 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 1119 PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr, 1120 png_uint_32 skip),PNG_EMPTY); 1121 1122 /* Read the CRC from the file and compare it to the libpng calculated CRC */ 1123 PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY); 1124 1125 /* Calculate the CRC over a section of data. Note that we are only 1126 * passing a maximum of 64K on systems that have this as a memory limit, 1127 * since this is the maximum buffer size we can specify. 1128 */ 1129 PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr, 1130 png_const_bytep ptr, png_size_t length),PNG_EMPTY); 1131 1132 #ifdef PNG_WRITE_FLUSH_SUPPORTED 1133 PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY); 1134 #endif 1135 1136 /* Write various chunks */ 1137 1138 /* Write the IHDR chunk, and update the png_struct with the necessary 1139 * information. 1140 */ 1141 PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr, 1142 png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, 1143 int compression_method, int filter_method, int interlace_method),PNG_EMPTY); 1144 1145 PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr, 1146 png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY); 1147 1148 PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr, 1149 png_const_bytep row_data, png_alloc_size_t row_data_length, int flush), 1150 PNG_EMPTY); 1151 1152 PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY); 1153 1154 #ifdef PNG_WRITE_gAMA_SUPPORTED 1155 PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr, 1156 png_fixed_point file_gamma),PNG_EMPTY); 1157 #endif 1158 1159 #ifdef PNG_WRITE_sBIT_SUPPORTED 1160 PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr, 1161 png_const_color_8p sbit, int color_type),PNG_EMPTY); 1162 #endif 1163 1164 #ifdef PNG_WRITE_cHRM_SUPPORTED 1165 PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr, 1166 const png_xy *xy), PNG_EMPTY); 1167 /* The xy value must have been previously validated */ 1168 #endif 1169 1170 #ifdef PNG_WRITE_sRGB_SUPPORTED 1171 PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr, 1172 int intent),PNG_EMPTY); 1173 #endif 1174 1175 #ifdef PNG_WRITE_eXIf_SUPPORTED 1176 PNG_INTERNAL_FUNCTION(void,png_write_eXIf,(png_structrp png_ptr, 1177 png_bytep exif, int num_exif),PNG_EMPTY); 1178 #endif 1179 1180 #ifdef PNG_WRITE_iCCP_SUPPORTED 1181 PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr, 1182 png_const_charp name, png_const_bytep profile), PNG_EMPTY); 1183 /* The profile must have been previously validated for correctness, the 1184 * length comes from the first four bytes. Only the base, deflate, 1185 * compression is supported. 1186 */ 1187 #endif 1188 1189 #ifdef PNG_WRITE_sPLT_SUPPORTED 1190 PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr, 1191 png_const_sPLT_tp palette),PNG_EMPTY); 1192 #endif 1193 1194 #ifdef PNG_WRITE_tRNS_SUPPORTED 1195 PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr, 1196 png_const_bytep trans, png_const_color_16p values, int number, 1197 int color_type),PNG_EMPTY); 1198 #endif 1199 1200 #ifdef PNG_WRITE_bKGD_SUPPORTED 1201 PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr, 1202 png_const_color_16p values, int color_type),PNG_EMPTY); 1203 #endif 1204 1205 #ifdef PNG_WRITE_hIST_SUPPORTED 1206 PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr, 1207 png_const_uint_16p hist, int num_hist),PNG_EMPTY); 1208 #endif 1209 1210 /* Chunks that have keywords */ 1211 #ifdef PNG_WRITE_tEXt_SUPPORTED 1212 PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr, 1213 png_const_charp key, png_const_charp text, png_size_t text_len),PNG_EMPTY); 1214 #endif 1215 1216 #ifdef PNG_WRITE_zTXt_SUPPORTED 1217 PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp 1218 key, png_const_charp text, int compression),PNG_EMPTY); 1219 #endif 1220 1221 #ifdef PNG_WRITE_iTXt_SUPPORTED 1222 PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr, 1223 int compression, png_const_charp key, png_const_charp lang, 1224 png_const_charp lang_key, png_const_charp text),PNG_EMPTY); 1225 #endif 1226 1227 #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ 1228 PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr, 1229 png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY); 1230 #endif 1231 1232 #ifdef PNG_WRITE_oFFs_SUPPORTED 1233 PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr, 1234 png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY); 1235 #endif 1236 1237 #ifdef PNG_WRITE_pCAL_SUPPORTED 1238 PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr, 1239 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, 1240 png_const_charp units, png_charpp params),PNG_EMPTY); 1241 #endif 1242 1243 #ifdef PNG_WRITE_pHYs_SUPPORTED 1244 PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr, 1245 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 1246 int unit_type),PNG_EMPTY); 1247 #endif 1248 1249 #ifdef PNG_WRITE_tIME_SUPPORTED 1250 PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr, 1251 png_const_timep mod_time),PNG_EMPTY); 1252 #endif 1253 1254 #ifdef PNG_WRITE_sCAL_SUPPORTED 1255 PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr, 1256 int unit, png_const_charp width, png_const_charp height),PNG_EMPTY); 1257 #endif 1258 1259 /* Called when finished processing a row of data */ 1260 PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr), 1261 PNG_EMPTY); 1262 1263 /* Internal use only. Called before first row of data */ 1264 PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr), 1265 PNG_EMPTY); 1266 1267 /* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an 1268 * array of png_ptr->width pixels. If the image is not interlaced or this 1269 * is the final pass this just does a memcpy, otherwise the "display" flag 1270 * is used to determine whether to copy pixels that are not in the current pass. 1271 * 1272 * Because 'png_do_read_interlace' (below) replicates pixels this allows this 1273 * function to achieve the documented 'blocky' appearance during interlaced read 1274 * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row' 1275 * are not changed if they are not in the current pass, when display is 0. 1276 * 1277 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless. 1278 * 1279 * The API always reads from the png_struct row buffer and always assumes that 1280 * it is full width (png_do_read_interlace has already been called.) 1281 * 1282 * This function is only ever used to write to row buffers provided by the 1283 * caller of the relevant libpng API and the row must have already been 1284 * transformed by the read transformations. 1285 * 1286 * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed 1287 * bitmasks for use within the code, otherwise runtime generated masks are used. 1288 * The default is compile time masks. 1289 */ 1290 #ifndef PNG_USE_COMPILE_TIME_MASKS 1291 # define PNG_USE_COMPILE_TIME_MASKS 1 1292 #endif 1293 PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr, 1294 png_bytep row, int display),PNG_EMPTY); 1295 1296 #ifdef PNG_READ_INTERLACING_SUPPORTED 1297 /* Expand an interlaced row: the 'row_info' describes the pass data that has 1298 * been read in and must correspond to the pixels in 'row', the pixels are 1299 * expanded (moved apart) in 'row' to match the final layout, when doing this 1300 * the pixels are *replicated* to the intervening space. This is essential for 1301 * the correct operation of png_combine_row, above. 1302 */ 1303 PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info, 1304 png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY); 1305 #endif 1306 1307 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 1308 1309 #ifdef PNG_WRITE_INTERLACING_SUPPORTED 1310 /* Grab pixels out of a row for an interlaced pass */ 1311 PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info, 1312 png_bytep row, int pass),PNG_EMPTY); 1313 #endif 1314 1315 /* Unfilter a row: check the filter value before calling this, there is no point 1316 * calling it for PNG_FILTER_VALUE_NONE. 1317 */ 1318 PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop 1319 row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY); 1320 1321 #if PNG_ARM_NEON_OPT > 0 1322 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info, 1323 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1324 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop 1325 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1326 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop 1327 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1328 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop 1329 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1330 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop 1331 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1332 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_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_paeth4_neon,(png_row_infop 1335 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1336 #endif 1337 1338 #if PNG_MIPS_MSA_OPT > 0 1339 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_msa,(png_row_infop row_info, 1340 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1341 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_msa,(png_row_infop 1342 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1343 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_msa,(png_row_infop 1344 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1345 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_msa,(png_row_infop 1346 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1347 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_msa,(png_row_infop 1348 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1349 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_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_paeth4_msa,(png_row_infop 1352 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1353 #endif 1354 1355 #if PNG_POWERPC_VSX_OPT > 0 1356 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_vsx,(png_row_infop row_info, 1357 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1358 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_vsx,(png_row_infop 1359 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1360 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_vsx,(png_row_infop 1361 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1362 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_vsx,(png_row_infop 1363 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1364 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_vsx,(png_row_infop 1365 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1366 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_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_paeth4_vsx,(png_row_infop 1369 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1370 #endif 1371 1372 #if PNG_INTEL_SSE_IMPLEMENTATION > 0 1373 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_sse2,(png_row_infop 1374 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1375 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_sse2,(png_row_infop 1376 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1377 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_sse2,(png_row_infop 1378 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1379 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_sse2,(png_row_infop 1380 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1381 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_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_paeth4_sse2,(png_row_infop 1384 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1385 #endif 1386 1387 /* Choose the best filter to use and filter the row data */ 1388 PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr, 1389 png_row_infop row_info),PNG_EMPTY); 1390 1391 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED 1392 PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr, 1393 png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY); 1394 /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer 1395 * is NULL the function checks, instead, for the end of the stream. In this 1396 * case a benign error will be issued if the stream end is not found or if 1397 * extra data has to be consumed. 1398 */ 1399 PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr), 1400 PNG_EMPTY); 1401 /* This cleans up when the IDAT LZ stream does not end when the last image 1402 * byte is read; there is still some pending input. 1403 */ 1404 1405 PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr), 1406 PNG_EMPTY); 1407 /* Finish a row while reading, dealing with interlacing passes, etc. */ 1408 #endif /* SEQUENTIAL_READ */ 1409 1410 /* Initialize the row buffers, etc. */ 1411 PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY); 1412 1413 #if ZLIB_VERNUM >= 0x1240 1414 PNG_INTERNAL_FUNCTION(int,png_zlib_inflate,(png_structrp png_ptr, int flush), 1415 PNG_EMPTY); 1416 # define PNG_INFLATE(pp, flush) png_zlib_inflate(pp, flush) 1417 #else /* Zlib < 1.2.4 */ 1418 # define PNG_INFLATE(pp, flush) inflate(&(pp)->zstream, flush) 1419 #endif /* Zlib < 1.2.4 */ 1420 1421 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1422 /* Optional call to update the users info structure */ 1423 PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr, 1424 png_inforp info_ptr),PNG_EMPTY); 1425 #endif 1426 1427 /* Shared transform functions, defined in pngtran.c */ 1428 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 1429 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 1430 PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info, 1431 png_bytep row, int at_start),PNG_EMPTY); 1432 #endif 1433 1434 #ifdef PNG_16BIT_SUPPORTED 1435 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 1436 PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info, 1437 png_bytep row),PNG_EMPTY); 1438 #endif 1439 #endif 1440 1441 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ 1442 defined(PNG_WRITE_PACKSWAP_SUPPORTED) 1443 PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info, 1444 png_bytep row),PNG_EMPTY); 1445 #endif 1446 1447 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 1448 PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info, 1449 png_bytep row),PNG_EMPTY); 1450 #endif 1451 1452 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1453 PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info, 1454 png_bytep row),PNG_EMPTY); 1455 #endif 1456 1457 /* The following decodes the appropriate chunks, and does error correction, 1458 * then calls the appropriate callback for the chunk if it is valid. 1459 */ 1460 1461 /* Decode the IHDR chunk */ 1462 PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr, 1463 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1464 PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr, 1465 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1466 PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr, 1467 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1468 1469 #ifdef PNG_READ_bKGD_SUPPORTED 1470 PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr, 1471 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1472 #endif 1473 1474 #ifdef PNG_READ_cHRM_SUPPORTED 1475 PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr, 1476 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1477 #endif 1478 1479 #ifdef PNG_READ_eXIf_SUPPORTED 1480 PNG_INTERNAL_FUNCTION(void,png_handle_eXIf,(png_structrp png_ptr, 1481 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1482 #endif 1483 1484 #ifdef PNG_READ_gAMA_SUPPORTED 1485 PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr, 1486 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1487 #endif 1488 1489 #ifdef PNG_READ_hIST_SUPPORTED 1490 PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr, 1491 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1492 #endif 1493 1494 #ifdef PNG_READ_iCCP_SUPPORTED 1495 PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr, 1496 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1497 #endif /* READ_iCCP */ 1498 1499 #ifdef PNG_READ_iTXt_SUPPORTED 1500 PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr, 1501 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1502 #endif 1503 1504 #ifdef PNG_READ_oFFs_SUPPORTED 1505 PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr, 1506 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1507 #endif 1508 1509 #ifdef PNG_READ_pCAL_SUPPORTED 1510 PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr, 1511 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1512 #endif 1513 1514 #ifdef PNG_READ_pHYs_SUPPORTED 1515 PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr, 1516 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1517 #endif 1518 1519 #ifdef PNG_READ_sBIT_SUPPORTED 1520 PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr, 1521 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1522 #endif 1523 1524 #ifdef PNG_READ_sCAL_SUPPORTED 1525 PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr, 1526 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1527 #endif 1528 1529 #ifdef PNG_READ_sPLT_SUPPORTED 1530 PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr, 1531 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1532 #endif /* READ_sPLT */ 1533 1534 #ifdef PNG_READ_sRGB_SUPPORTED 1535 PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr, 1536 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1537 #endif 1538 1539 #ifdef PNG_READ_tEXt_SUPPORTED 1540 PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr, 1541 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1542 #endif 1543 1544 #ifdef PNG_READ_tIME_SUPPORTED 1545 PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr, 1546 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1547 #endif 1548 1549 #ifdef PNG_READ_tRNS_SUPPORTED 1550 PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr, 1551 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1552 #endif 1553 1554 #ifdef PNG_READ_zTXt_SUPPORTED 1555 PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr, 1556 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1557 #endif 1558 1559 PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_const_structrp png_ptr, 1560 const png_uint_32 chunk_name),PNG_EMPTY); 1561 1562 PNG_INTERNAL_FUNCTION(void,png_check_chunk_length,(png_const_structrp png_ptr, 1563 const png_uint_32 chunk_length),PNG_EMPTY); 1564 1565 PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr, 1566 png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY); 1567 /* This is the function that gets called for unknown chunks. The 'keep' 1568 * argument is either non-zero for a known chunk that has been set to be 1569 * handled as unknown or zero for an unknown chunk. By default the function 1570 * just skips the chunk or errors out if it is critical. 1571 */ 1572 1573 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\ 1574 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 1575 PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling, 1576 (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY); 1577 /* Exactly as the API png_handle_as_unknown() except that the argument is a 1578 * 32-bit chunk name, not a string. 1579 */ 1580 #endif /* READ_UNKNOWN_CHUNKS || HANDLE_AS_UNKNOWN */ 1581 1582 /* Handle the transformations for reading and writing */ 1583 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1584 PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr, 1585 png_row_infop row_info),PNG_EMPTY); 1586 #endif 1587 #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED 1588 PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr, 1589 png_row_infop row_info),PNG_EMPTY); 1590 #endif 1591 1592 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1593 PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr), 1594 PNG_EMPTY); 1595 #endif 1596 1597 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1598 PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr, 1599 png_inforp info_ptr),PNG_EMPTY); 1600 PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr, 1601 png_inforp info_ptr),PNG_EMPTY); 1602 PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY); 1603 PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr), 1604 PNG_EMPTY); 1605 PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr, 1606 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); 1607 PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY); 1608 PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr, 1609 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); 1610 PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr), 1611 PNG_EMPTY); 1612 PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr, 1613 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1614 PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr, 1615 png_inforp info_ptr),PNG_EMPTY); 1616 PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr, 1617 png_inforp info_ptr),PNG_EMPTY); 1618 PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr, 1619 png_bytep row),PNG_EMPTY); 1620 PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr, 1621 png_inforp info_ptr),PNG_EMPTY); 1622 PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr, 1623 png_inforp info_ptr),PNG_EMPTY); 1624 PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr), 1625 PNG_EMPTY); 1626 # ifdef PNG_READ_tEXt_SUPPORTED 1627 PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr, 1628 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1629 PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr, 1630 png_inforp info_ptr),PNG_EMPTY); 1631 # endif 1632 # ifdef PNG_READ_zTXt_SUPPORTED 1633 PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr, 1634 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1635 PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr, 1636 png_inforp info_ptr),PNG_EMPTY); 1637 # endif 1638 # ifdef PNG_READ_iTXt_SUPPORTED 1639 PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr, 1640 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1641 PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr, 1642 png_inforp info_ptr),PNG_EMPTY); 1643 # endif 1644 1645 #endif /* PROGRESSIVE_READ */ 1646 1647 /* Added at libpng version 1.6.0 */ 1648 #ifdef PNG_GAMMA_SUPPORTED 1649 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr, 1650 png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY); 1651 /* Set the colorspace gamma with a value provided by the application or by 1652 * the gAMA chunk on read. The value will override anything set by an ICC 1653 * profile. 1654 */ 1655 1656 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr, 1657 png_inforp info_ptr), PNG_EMPTY); 1658 /* Synchronize the info 'valid' flags with the colorspace */ 1659 1660 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr, 1661 png_inforp info_ptr), PNG_EMPTY); 1662 /* Copy the png_struct colorspace to the info_struct and call the above to 1663 * synchronize the flags. Checks for NULL info_ptr and does nothing. 1664 */ 1665 #endif 1666 1667 /* Added at libpng version 1.4.0 */ 1668 #ifdef PNG_COLORSPACE_SUPPORTED 1669 /* These internal functions are for maintaining the colorspace structure within 1670 * a png_info or png_struct (or, indeed, both). 1671 */ 1672 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities, 1673 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy, 1674 int preferred), PNG_EMPTY); 1675 1676 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints, 1677 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ, 1678 int preferred), PNG_EMPTY); 1679 1680 #ifdef PNG_sRGB_SUPPORTED 1681 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr, 1682 png_colorspacerp colorspace, int intent), PNG_EMPTY); 1683 /* This does set the colorspace gAMA and cHRM values too, but doesn't set the 1684 * flags to write them, if it returns false there was a problem and an error 1685 * message has already been output (but the colorspace may still need to be 1686 * synced to record the invalid flag). 1687 */ 1688 #endif /* sRGB */ 1689 1690 #ifdef PNG_iCCP_SUPPORTED 1691 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr, 1692 png_colorspacerp colorspace, png_const_charp name, 1693 png_uint_32 profile_length, png_const_bytep profile, int color_type), 1694 PNG_EMPTY); 1695 /* The 'name' is used for information only */ 1696 1697 /* Routines for checking parts of an ICC profile. */ 1698 #ifdef PNG_READ_iCCP_SUPPORTED 1699 PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr, 1700 png_colorspacerp colorspace, png_const_charp name, 1701 png_uint_32 profile_length), PNG_EMPTY); 1702 #endif /* READ_iCCP */ 1703 PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr, 1704 png_colorspacerp colorspace, png_const_charp name, 1705 png_uint_32 profile_length, 1706 png_const_bytep profile /* first 132 bytes only */, int color_type), 1707 PNG_EMPTY); 1708 PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr, 1709 png_colorspacerp colorspace, png_const_charp name, 1710 png_uint_32 profile_length, 1711 png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY); 1712 #ifdef PNG_sRGB_SUPPORTED 1713 PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,( 1714 png_const_structrp png_ptr, png_colorspacerp colorspace, 1715 png_const_bytep profile, uLong adler), PNG_EMPTY); 1716 /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may 1717 * be zero to indicate that it is not available. It is used, if provided, 1718 * as a fast check on the profile when checking to see if it is sRGB. 1719 */ 1720 #endif 1721 #endif /* iCCP */ 1722 1723 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1724 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients, 1725 (png_structrp png_ptr), PNG_EMPTY); 1726 /* Set the rgb_to_gray coefficients from the colorspace Y values */ 1727 #endif /* READ_RGB_TO_GRAY */ 1728 #endif /* COLORSPACE */ 1729 1730 /* Added at libpng version 1.4.0 */ 1731 PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr, 1732 png_uint_32 width, png_uint_32 height, int bit_depth, 1733 int color_type, int interlace_type, int compression_type, 1734 int filter_type),PNG_EMPTY); 1735 1736 /* Added at libpng version 1.5.10 */ 1737 #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \ 1738 defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED) 1739 PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes, 1740 (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY); 1741 #endif 1742 1743 #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) 1744 PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr, 1745 png_const_charp name),PNG_NORETURN); 1746 #endif 1747 1748 /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite 1749 * the end. Always leaves the buffer nul terminated. Never errors out (and 1750 * there is no error code.) 1751 */ 1752 PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize, 1753 size_t pos, png_const_charp string),PNG_EMPTY); 1754 1755 /* Various internal functions to handle formatted warning messages, currently 1756 * only implemented for warnings. 1757 */ 1758 #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) 1759 /* Utility to dump an unsigned value into a buffer, given a start pointer and 1760 * and end pointer (which should point just *beyond* the end of the buffer!) 1761 * Returns the pointer to the start of the formatted string. This utility only 1762 * does unsigned values. 1763 */ 1764 PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start, 1765 png_charp end, int format, png_alloc_size_t number),PNG_EMPTY); 1766 1767 /* Convenience macro that takes an array: */ 1768 #define PNG_FORMAT_NUMBER(buffer,format,number) \ 1769 png_format_number(buffer, buffer + (sizeof buffer), format, number) 1770 1771 /* Suggested size for a number buffer (enough for 64 bits and a sign!) */ 1772 #define PNG_NUMBER_BUFFER_SIZE 24 1773 1774 /* These are the integer formats currently supported, the name is formed from 1775 * the standard printf(3) format string. 1776 */ 1777 #define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */ 1778 #define PNG_NUMBER_FORMAT_02u 2 1779 #define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */ 1780 #define PNG_NUMBER_FORMAT_02d 2 1781 #define PNG_NUMBER_FORMAT_x 3 1782 #define PNG_NUMBER_FORMAT_02x 4 1783 #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */ 1784 #endif 1785 1786 #ifdef PNG_WARNINGS_SUPPORTED 1787 /* New defines and members adding in libpng-1.5.4 */ 1788 # define PNG_WARNING_PARAMETER_SIZE 32 1789 # define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */ 1790 1791 /* An l-value of this type has to be passed to the APIs below to cache the 1792 * values of the parameters to a formatted warning message. 1793 */ 1794 typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][ 1795 PNG_WARNING_PARAMETER_SIZE]; 1796 1797 PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p, 1798 int number, png_const_charp string),PNG_EMPTY); 1799 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters, 1800 * including the trailing '\0'. 1801 */ 1802 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned, 1803 (png_warning_parameters p, int number, int format, png_alloc_size_t value), 1804 PNG_EMPTY); 1805 /* Use png_alloc_size_t because it is an unsigned type as big as any we 1806 * need to output. Use the following for a signed value. 1807 */ 1808 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed, 1809 (png_warning_parameters p, int number, int format, png_int_32 value), 1810 PNG_EMPTY); 1811 1812 PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr, 1813 png_warning_parameters p, png_const_charp message),PNG_EMPTY); 1814 /* 'message' follows the X/Open approach of using @1, @2 to insert 1815 * parameters previously supplied using the above functions. Errors in 1816 * specifying the parameters will simply result in garbage substitutions. 1817 */ 1818 #endif 1819 1820 #ifdef PNG_BENIGN_ERRORS_SUPPORTED 1821 /* Application errors (new in 1.6); use these functions (declared below) for 1822 * errors in the parameters or order of API function calls on read. The 1823 * 'warning' should be used for an error that can be handled completely; the 1824 * 'error' for one which can be handled safely but which may lose application 1825 * information or settings. 1826 * 1827 * By default these both result in a png_error call prior to release, while in a 1828 * released version the 'warning' is just a warning. However if the application 1829 * explicitly disables benign errors (explicitly permitting the code to lose 1830 * information) they both turn into warnings. 1831 * 1832 * If benign errors aren't supported they end up as the corresponding base call 1833 * (png_warning or png_error.) 1834 */ 1835 PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr, 1836 png_const_charp message),PNG_EMPTY); 1837 /* The application provided invalid parameters to an API function or called 1838 * an API function at the wrong time, libpng can completely recover. 1839 */ 1840 1841 PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr, 1842 png_const_charp message),PNG_EMPTY); 1843 /* As above but libpng will ignore the call, or attempt some other partial 1844 * recovery from the error. 1845 */ 1846 #else 1847 # define png_app_warning(pp,s) png_warning(pp,s) 1848 # define png_app_error(pp,s) png_error(pp,s) 1849 #endif 1850 1851 PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr, 1852 png_const_charp message, int error),PNG_EMPTY); 1853 /* Report a recoverable issue in chunk data. On read this is used to report 1854 * a problem found while reading a particular chunk and the 1855 * png_chunk_benign_error or png_chunk_warning function is used as 1856 * appropriate. On write this is used to report an error that comes from 1857 * data set via an application call to a png_set_ API and png_app_error or 1858 * png_app_warning is used as appropriate. 1859 * 1860 * The 'error' parameter must have one of the following values: 1861 */ 1862 #define PNG_CHUNK_WARNING 0 /* never an error */ 1863 #define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */ 1864 #define PNG_CHUNK_ERROR 2 /* always an error */ 1865 1866 /* ASCII to FP interfaces, currently only implemented if sCAL 1867 * support is required. 1868 */ 1869 #if defined(PNG_sCAL_SUPPORTED) 1870 /* MAX_DIGITS is actually the maximum number of characters in an sCAL 1871 * width or height, derived from the precision (number of significant 1872 * digits - a build time settable option) and assumptions about the 1873 * maximum ridiculous exponent. 1874 */ 1875 #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/) 1876 1877 #ifdef PNG_FLOATING_POINT_SUPPORTED 1878 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr, 1879 png_charp ascii, png_size_t size, double fp, unsigned int precision), 1880 PNG_EMPTY); 1881 #endif /* FLOATING_POINT */ 1882 1883 #ifdef PNG_FIXED_POINT_SUPPORTED 1884 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr, 1885 png_charp ascii, png_size_t size, png_fixed_point fp),PNG_EMPTY); 1886 #endif /* FIXED_POINT */ 1887 #endif /* sCAL */ 1888 1889 #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) 1890 /* An internal API to validate the format of a floating point number. 1891 * The result is the index of the next character. If the number is 1892 * not valid it will be the index of a character in the supposed number. 1893 * 1894 * The format of a number is defined in the PNG extensions specification 1895 * and this API is strictly conformant to that spec, not anyone elses! 1896 * 1897 * The format as a regular expression is: 1898 * 1899 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)? 1900 * 1901 * or: 1902 * 1903 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)? 1904 * 1905 * The complexity is that either integer or fraction must be present and the 1906 * fraction is permitted to have no digits only if the integer is present. 1907 * 1908 * NOTE: The dangling E problem. 1909 * There is a PNG valid floating point number in the following: 1910 * 1911 * PNG floating point numbers are not greedy. 1912 * 1913 * Working this out requires *TWO* character lookahead (because of the 1914 * sign), the parser does not do this - it will fail at the 'r' - this 1915 * doesn't matter for PNG sCAL chunk values, but it requires more care 1916 * if the value were ever to be embedded in something more complex. Use 1917 * ANSI-C strtod if you need the lookahead. 1918 */ 1919 /* State table for the parser. */ 1920 #define PNG_FP_INTEGER 0 /* before or in integer */ 1921 #define PNG_FP_FRACTION 1 /* before or in fraction */ 1922 #define PNG_FP_EXPONENT 2 /* before or in exponent */ 1923 #define PNG_FP_STATE 3 /* mask for the above */ 1924 #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */ 1925 #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */ 1926 #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */ 1927 #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */ 1928 #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */ 1929 1930 /* These three values don't affect the parser. They are set but not used. 1931 */ 1932 #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */ 1933 #define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */ 1934 #define PNG_FP_NONZERO 256 /* A non-zero value */ 1935 #define PNG_FP_STICKY 448 /* The above three flags */ 1936 1937 /* This is available for the caller to store in 'state' if required. Do not 1938 * call the parser after setting it (the parser sometimes clears it.) 1939 */ 1940 #define PNG_FP_INVALID 512 /* Available for callers as a distinct value */ 1941 1942 /* Result codes for the parser (boolean - true meants ok, false means 1943 * not ok yet.) 1944 */ 1945 #define PNG_FP_MAYBE 0 /* The number may be valid in the future */ 1946 #define PNG_FP_OK 1 /* The number is valid */ 1947 1948 /* Tests on the sticky non-zero and negative flags. To pass these checks 1949 * the state must also indicate that the whole number is valid - this is 1950 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this 1951 * is equivalent to PNG_FP_OK above.) 1952 */ 1953 #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO) 1954 /* NZ_MASK: the string is valid and a non-zero negative value */ 1955 #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO) 1956 /* Z MASK: the string is valid and a non-zero value. */ 1957 /* PNG_FP_SAW_DIGIT: the string is valid. */ 1958 #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT) 1959 #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK) 1960 #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK) 1961 1962 /* The actual parser. This can be called repeatedly. It updates 1963 * the index into the string and the state variable (which must 1964 * be initialized to 0). It returns a result code, as above. There 1965 * is no point calling the parser any more if it fails to advance to 1966 * the end of the string - it is stuck on an invalid character (or 1967 * terminated by '\0'). 1968 * 1969 * Note that the pointer will consume an E or even an E+ and then leave 1970 * a 'maybe' state even though a preceding integer.fraction is valid. 1971 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was 1972 * a valid number. It's possible to recover from this by calling 1973 * the parser again (from the start, with state 0) but with a string 1974 * that omits the last character (i.e. set the size to the index of 1975 * the problem character.) This has not been tested within libpng. 1976 */ 1977 PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string, 1978 png_size_t size, int *statep, png_size_tp whereami),PNG_EMPTY); 1979 1980 /* This is the same but it checks a complete string and returns true 1981 * only if it just contains a floating point number. As of 1.5.4 this 1982 * function also returns the state at the end of parsing the number if 1983 * it was valid (otherwise it returns 0.) This can be used for testing 1984 * for negative or zero values using the sticky flag. 1985 */ 1986 PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string, 1987 png_size_t size),PNG_EMPTY); 1988 #endif /* pCAL || sCAL */ 1989 1990 #if defined(PNG_GAMMA_SUPPORTED) ||\ 1991 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED) 1992 /* Added at libpng version 1.5.0 */ 1993 /* This is a utility to provide a*times/div (rounded) and indicate 1994 * if there is an overflow. The result is a boolean - false (0) 1995 * for overflow, true (1) if no overflow, in which case *res 1996 * holds the result. 1997 */ 1998 PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a, 1999 png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY); 2000 #endif 2001 2002 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED) 2003 /* Same deal, but issue a warning on overflow and return 0. */ 2004 PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn, 2005 (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by, 2006 png_int_32 divided_by),PNG_EMPTY); 2007 #endif 2008 2009 #ifdef PNG_GAMMA_SUPPORTED 2010 /* Calculate a reciprocal - used for gamma values. This returns 2011 * 0 if the argument is 0 in order to maintain an undefined value; 2012 * there are no warnings. 2013 */ 2014 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a), 2015 PNG_EMPTY); 2016 2017 #ifdef PNG_READ_GAMMA_SUPPORTED 2018 /* The same but gives a reciprocal of the product of two fixed point 2019 * values. Accuracy is suitable for gamma calculations but this is 2020 * not exact - use png_muldiv for that. Only required at present on read. 2021 */ 2022 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a, 2023 png_fixed_point b),PNG_EMPTY); 2024 #endif 2025 2026 /* Return true if the gamma value is significantly different from 1.0 */ 2027 PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value), 2028 PNG_EMPTY); 2029 #endif 2030 2031 #ifdef PNG_READ_GAMMA_SUPPORTED 2032 /* Internal fixed point gamma correction. These APIs are called as 2033 * required to convert single values - they don't need to be fast, 2034 * they are not used when processing image pixel values. 2035 * 2036 * While the input is an 'unsigned' value it must actually be the 2037 * correct bit value - 0..255 or 0..65535 as required. 2038 */ 2039 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr, 2040 unsigned int value, png_fixed_point gamma_value),PNG_EMPTY); 2041 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value, 2042 png_fixed_point gamma_value),PNG_EMPTY); 2043 PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value, 2044 png_fixed_point gamma_value),PNG_EMPTY); 2045 PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr), 2046 PNG_EMPTY); 2047 PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr, 2048 int bit_depth),PNG_EMPTY); 2049 #endif 2050 2051 /* SIMPLIFIED READ/WRITE SUPPORT */ 2052 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 2053 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 2054 /* The internal structure that png_image::opaque points to. */ 2055 typedef struct png_control 2056 { 2057 png_structp png_ptr; 2058 png_infop info_ptr; 2059 png_voidp error_buf; /* Always a jmp_buf at present. */ 2060 2061 png_const_bytep memory; /* Memory buffer. */ 2062 png_size_t size; /* Size of the memory buffer. */ 2063 2064 unsigned int for_write :1; /* Otherwise it is a read structure */ 2065 unsigned int owned_file :1; /* We own the file in io_ptr */ 2066 } png_control; 2067 2068 /* Return the pointer to the jmp_buf from a png_control: necessary because C 2069 * does not reveal the type of the elements of jmp_buf. 2070 */ 2071 #ifdef __cplusplus 2072 # define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0]) 2073 #else 2074 # define png_control_jmp_buf(pc) ((pc)->error_buf) 2075 #endif 2076 2077 /* Utility to safely execute a piece of libpng code catching and logging any 2078 * errors that might occur. Returns true on success, false on failure (either 2079 * of the function or as a result of a png_error.) 2080 */ 2081 PNG_INTERNAL_CALLBACK(void,png_safe_error,(png_structp png_ptr, 2082 png_const_charp error_message),PNG_NORETURN); 2083 2084 #ifdef PNG_WARNINGS_SUPPORTED 2085 PNG_INTERNAL_CALLBACK(void,png_safe_warning,(png_structp png_ptr, 2086 png_const_charp warning_message),PNG_EMPTY); 2087 #else 2088 # define png_safe_warning 0/*dummy argument*/ 2089 #endif 2090 2091 PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image, 2092 int (*function)(png_voidp), png_voidp arg),PNG_EMPTY); 2093 2094 /* Utility to log an error; this also cleans up the png_image; the function 2095 * always returns 0 (false). 2096 */ 2097 PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image, 2098 png_const_charp error_message),PNG_EMPTY); 2099 2100 #ifndef PNG_SIMPLIFIED_READ_SUPPORTED 2101 /* png_image_free is used by the write code but not exported */ 2102 PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY); 2103 #endif /* !SIMPLIFIED_READ */ 2104 2105 #endif /* SIMPLIFIED READ/WRITE */ 2106 2107 /* These are initialization functions for hardware specific PNG filter 2108 * optimizations; list these here then select the appropriate one at compile 2109 * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined 2110 * the generic code is used. 2111 */ 2112 #ifdef PNG_FILTER_OPTIMIZATIONS 2113 PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr, 2114 unsigned int bpp), PNG_EMPTY); 2115 /* Just declare the optimization that will be used */ 2116 #else 2117 /* List *all* the possible optimizations here - this branch is required if 2118 * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in 2119 * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing. 2120 */ 2121 # if PNG_ARM_NEON_OPT > 0 2122 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon, 2123 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2124 #endif 2125 2126 #if PNG_MIPS_MSA_OPT > 0 2127 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_msa, 2128 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2129 #endif 2130 2131 # if PNG_INTEL_SSE_IMPLEMENTATION > 0 2132 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_sse2, 2133 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2134 # endif 2135 #endif 2136 2137 PNG_INTERNAL_FUNCTION(png_uint_32, png_check_keyword, (png_structrp png_ptr, 2138 png_const_charp key, png_bytep new_key), PNG_EMPTY); 2139 2140 /* Maintainer: Put new private prototypes here ^ */ 2141 2142 #include "pngdebug.h" 2143 2144 #ifdef __cplusplus 2145 } 2146 #endif 2147 2148 #endif /* PNG_VERSION_INFO_ONLY */ 2149 #endif /* PNGPRIV_H */