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