1 2/* pngpriv.h - private declarations for use inside libpng 3 * 4 * Last changed in libpng 1.6.22 [May 26, 2016] 5 * Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson 6 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) 7 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) 8 * 9 * This code is released under the libpng license. 10 * For conditions of distribution and use, see the disclaimer 11 * and license in png.h 12 */ 13 14/* The symbols declared in this file (including the functions declared 15 * as extern) are PRIVATE. They are not part of the libpng public 16 * interface, and are not recommended for use by regular applications. 17 * Some of them may become public in the future; others may stay private, 18 * change in an incompatible way, or even disappear. 19 * Although the libpng users are not forbidden to include this header, 20 * they should be well aware of the issues that may arise from doing so. 21 */ 22 23#ifndef PNGPRIV_H 24#define PNGPRIV_H 25 26/* Feature Test Macros. The following are defined here to ensure that correctly 27 * implemented libraries reveal the APIs libpng needs to build and hide those 28 * that are not needed and potentially damaging to the compilation. 29 * 30 * Feature Test Macros must be defined before any system header is included (see 31 * POSIX 1003.1 2.8.2 "POSIX Symbols." 32 * 33 * These macros only have an effect if the operating system supports either 34 * POSIX 1003.1 or C99, or both. On other operating systems (particularly 35 * Windows/Visual Studio) there is no effect; the OS specific tests below are 36 * still required (as of 2011-05-02.) 37 */ 38#define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */ 39 40#ifndef PNG_VERSION_INFO_ONLY 41/* Standard library headers not required by png.h: */ 42# include <stdlib.h> 43# include <string.h> 44#endif 45 46#define PNGLIB_BUILD /*libpng is being built, not used*/ 47 48/* If HAVE_CONFIG_H is defined during the build then the build system must 49 * provide an appropriate "config.h" file on the include path. The header file 50 * must provide definitions as required below (search for "HAVE_CONFIG_H"); 51 * see configure.ac for more details of the requirements. The macro 52 * "PNG_NO_CONFIG_H" is provided for maintainers to test for dependencies on 53 * 'configure'; define this macro to prevent the configure build including the 54 * configure generated config.h. Libpng is expected to compile without *any* 55 * special build system support on a reasonably ANSI-C compliant system. 56 */ 57#if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H) 58# include <config.h> 59 60 /* Pick up the definition of 'restrict' from config.h if it was read: */ 61# define PNG_RESTRICT restrict 62#endif 63 64/* To support symbol prefixing it is necessary to know *before* including png.h 65 * whether the fixed point (and maybe other) APIs are exported, because if they 66 * are not internal definitions may be required. This is handled below just 67 * before png.h is included, but load the configuration now if it is available. 68 */ 69#ifndef PNGLCONF_H 70# include "pnglibconf.h" 71#endif 72 73/* Local renames may change non-exported API functions from png.h */ 74#if defined(PNG_PREFIX) && !defined(PNGPREFIX_H) 75# include "pngprefix.h" 76#endif 77 78#ifdef PNG_USER_CONFIG 79# include "pngusr.h" 80 /* These should have been defined in pngusr.h */ 81# ifndef PNG_USER_PRIVATEBUILD 82# define PNG_USER_PRIVATEBUILD "Custom libpng build" 83# endif 84# ifndef PNG_USER_DLLFNAME_POSTFIX 85# define PNG_USER_DLLFNAME_POSTFIX "Cb" 86# endif 87#endif 88 89/* Compile time options. 90 * ===================== 91 * In a multi-arch build the compiler may compile the code several times for the 92 * same object module, producing different binaries for different architectures. 93 * When this happens configure-time setting of the target host options cannot be 94 * done and this interferes with the handling of the ARM NEON optimizations, and 95 * possibly other similar optimizations. Put additional tests here; in general 96 * this is needed when the same option can be changed at both compile time and 97 * run time depending on the target OS (i.e. iOS vs Android.) 98 * 99 * NOTE: symbol prefixing does not pass $(CFLAGS) to the preprocessor, because 100 * this is not possible with certain compilers (Oracle SUN OS CC), as a result 101 * it is necessary to ensure that all extern functions that *might* be used 102 * regardless of $(CFLAGS) get declared in this file. The test on __ARM_NEON__ 103 * below is one example of this behavior because it is controlled by the 104 * presence or not of -mfpu=neon on the GCC command line, it is possible to do 105 * this in $(CC), e.g. "CC=gcc -mfpu=neon", but people who build libpng rarely 106 * do this. 107 */ 108#ifndef PNG_ARM_NEON_OPT 109 /* ARM NEON optimizations are being controlled by the compiler settings, 110 * typically the target FPU. If the FPU has been set to NEON (-mfpu=neon 111 * with GCC) then the compiler will define __ARM_NEON__ and we can rely 112 * unconditionally on NEON instructions not crashing, otherwise we must 113 * disable use of NEON instructions. 114 * 115 * NOTE: at present these optimizations depend on 'ALIGNED_MEMORY', so they 116 * can only be turned on automatically if that is supported too. If 117 * PNG_ARM_NEON_OPT is set in CPPFLAGS (to >0) then arm/arm_init.c will fail 118 * to compile with an appropriate #error if ALIGNED_MEMORY has been turned 119 * off. 120 * 121 * Note that gcc-4.9 defines __ARM_NEON instead of the deprecated 122 * __ARM_NEON__, so we check both variants. 123 * 124 * To disable ARM_NEON optimizations entirely, and skip compiling the 125 * associated assembler code, pass --enable-arm-neon=no to configure 126 * or put -DPNG_ARM_NEON_OPT=0 in CPPFLAGS. 127 */ 128# if (defined(__ARM_NEON__) || defined(__ARM_NEON)) && \ 129 defined(PNG_ALIGNED_MEMORY_SUPPORTED) 130# define PNG_ARM_NEON_OPT 2 131# else 132# define PNG_ARM_NEON_OPT 0 133# endif 134#endif 135 136#if PNG_ARM_NEON_OPT > 0 137 /* NEON optimizations are to be at least considered by libpng, so enable the 138 * callbacks to do this. 139 */ 140# define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_neon 141 142 /* By default the 'intrinsics' code in arm/filter_neon_intrinsics.c is used 143 * if possible - if __ARM_NEON__ is set and the compiler version is not known 144 * to be broken. This is controlled by PNG_ARM_NEON_IMPLEMENTATION which can 145 * be: 146 * 147 * 1 The intrinsics code (the default with __ARM_NEON__) 148 * 2 The hand coded assembler (the default without __ARM_NEON__) 149 * 150 * It is possible to set PNG_ARM_NEON_IMPLEMENTATION in CPPFLAGS, however 151 * this is *NOT* supported and may cease to work even after a minor revision 152 * to libpng. It *is* valid to do this for testing purposes, e.g. speed 153 * testing or a new compiler, but the results should be communicated to the 154 * libpng implementation list for incorporation in the next minor release. 155 */ 156# ifndef PNG_ARM_NEON_IMPLEMENTATION 157# if defined(__ARM_NEON__) || defined(__ARM_NEON) 158# if defined(__clang__) 159 /* At present it is unknown by the libpng developers which versions 160 * of clang support the intrinsics, however some or perhaps all 161 * versions do not work with the assembler so this may be 162 * irrelevant, so just use the default (do nothing here.) 163 */ 164# elif defined(__GNUC__) 165 /* GCC 4.5.4 NEON support is known to be broken. 4.6.3 is known to 166 * work, so if this *is* GCC, or G++, look for a version >4.5 167 */ 168# if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6) 169# define PNG_ARM_NEON_IMPLEMENTATION 2 170# endif /* no GNUC support */ 171# endif /* __GNUC__ */ 172# else /* !defined __ARM_NEON__ */ 173 /* The 'intrinsics' code simply won't compile without this -mfpu=neon: 174 */ 175# define PNG_ARM_NEON_IMPLEMENTATION 2 176# endif /* __ARM_NEON__ */ 177# endif /* !PNG_ARM_NEON_IMPLEMENTATION */ 178 179# ifndef PNG_ARM_NEON_IMPLEMENTATION 180 /* Use the intrinsics code by default. */ 181# define PNG_ARM_NEON_IMPLEMENTATION 1 182# endif 183#endif /* PNG_ARM_NEON_OPT > 0 */ 184 185#ifndef PNG_INTEL_SSE_OPT 186# ifdef PNG_INTEL_SSE 187 /* Only check for SSE if the build configuration has been modified to 188 * enable SSE optimizations. This means that these optimizations will 189 * be off by default. See contrib/intel for more details. 190 */ 191# if defined(__SSE4_1__) || defined(__AVX__) || defined(__SSSE3__) || \ 192 defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \ 193 (defined(_M_IX86_FP) && _M_IX86_FP >= 2) 194# define PNG_INTEL_SSE_OPT 1 195# endif 196# endif 197#endif 198 199#if PNG_INTEL_SSE_OPT > 0 200# ifndef PNG_INTEL_SSE_IMPLEMENTATION 201# if defined(__SSE4_1__) || defined(__AVX__) 202 /* We are not actually using AVX, but checking for AVX is the best 203 way we can detect SSE4.1 and SSSE3 on MSVC. 204 */ 205# define PNG_INTEL_SSE_IMPLEMENTATION 3 206# elif defined(__SSSE3__) 207# define PNG_INTEL_SSE_IMPLEMENTATION 2 208# elif defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \ 209 (defined(_M_IX86_FP) && _M_IX86_FP >= 2) 210# define PNG_INTEL_SSE_IMPLEMENTATION 1 211# else 212# define PNG_INTEL_SSE_IMPLEMENTATION 0 213# endif 214# endif 215 216# if PNG_INTEL_SSE_IMPLEMENTATION > 0 217# define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_sse2 218# endif 219#endif 220 221/* Is this a build of a DLL where compilation of the object modules requires 222 * different preprocessor settings to those required for a simple library? If 223 * so PNG_BUILD_DLL must be set. 224 * 225 * If libpng is used inside a DLL but that DLL does not export the libpng APIs 226 * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a 227 * static library of libpng then link the DLL against that. 228 */ 229#ifndef PNG_BUILD_DLL 230# ifdef DLL_EXPORT 231 /* This is set by libtool when files are compiled for a DLL; libtool 232 * always compiles twice, even on systems where it isn't necessary. Set 233 * PNG_BUILD_DLL in case it is necessary: 234 */ 235# define PNG_BUILD_DLL 236# else 237# ifdef _WINDLL 238 /* This is set by the Microsoft Visual Studio IDE in projects that 239 * build a DLL. It can't easily be removed from those projects (it 240 * isn't visible in the Visual Studio UI) so it is a fairly reliable 241 * indication that PNG_IMPEXP needs to be set to the DLL export 242 * attributes. 243 */ 244# define PNG_BUILD_DLL 245# else 246# ifdef __DLL__ 247 /* This is set by the Borland C system when compiling for a DLL 248 * (as above.) 249 */ 250# define PNG_BUILD_DLL 251# else 252 /* Add additional compiler cases here. */ 253# endif 254# endif 255# endif 256#endif /* Setting PNG_BUILD_DLL if required */ 257 258/* See pngconf.h for more details: the builder of the library may set this on 259 * the command line to the right thing for the specific compilation system or it 260 * may be automagically set above (at present we know of no system where it does 261 * need to be set on the command line.) 262 * 263 * PNG_IMPEXP must be set here when building the library to prevent pngconf.h 264 * setting it to the "import" setting for a DLL build. 265 */ 266#ifndef PNG_IMPEXP 267# ifdef PNG_BUILD_DLL 268# define PNG_IMPEXP PNG_DLL_EXPORT 269# else 270 /* Not building a DLL, or the DLL doesn't require specific export 271 * definitions. 272 */ 273# define PNG_IMPEXP 274# endif 275#endif 276 277/* No warnings for private or deprecated functions in the build: */ 278#ifndef PNG_DEPRECATED 279# define PNG_DEPRECATED 280#endif 281#ifndef PNG_PRIVATE 282# define PNG_PRIVATE 283#endif 284 285/* Symbol preprocessing support. 286 * 287 * To enable listing global, but internal, symbols the following macros should 288 * always be used to declare an extern data or function object in this file. 289 */ 290#ifndef PNG_INTERNAL_DATA 291# define PNG_INTERNAL_DATA(type, name, array) PNG_LINKAGE_DATA type name array 292#endif 293 294#ifndef PNG_INTERNAL_FUNCTION 295# define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\ 296 PNG_LINKAGE_FUNCTION PNG_FUNCTION(type, name, args, PNG_EMPTY attributes) 297#endif 298 299#ifndef PNG_INTERNAL_CALLBACK 300# define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\ 301 PNG_LINKAGE_CALLBACK PNG_FUNCTION(type, (PNGCBAPI name), args,\ 302 PNG_EMPTY attributes) 303#endif 304 305/* If floating or fixed point APIs are disabled they may still be compiled 306 * internally. To handle this make sure they are declared as the appropriate 307 * internal extern function (otherwise the symbol prefixing stuff won't work and 308 * the functions will be used without definitions.) 309 * 310 * NOTE: although all the API functions are declared here they are not all 311 * actually built! Because the declarations are still made it is necessary to 312 * fake out types that they depend on. 313 */ 314#ifndef PNG_FP_EXPORT 315# ifndef PNG_FLOATING_POINT_SUPPORTED 316# define PNG_FP_EXPORT(ordinal, type, name, args)\ 317 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 318# ifndef PNG_VERSION_INFO_ONLY 319 typedef struct png_incomplete png_double; 320 typedef png_double* png_doublep; 321 typedef const png_double* png_const_doublep; 322 typedef png_double** png_doublepp; 323# endif 324# endif 325#endif 326#ifndef PNG_FIXED_EXPORT 327# ifndef PNG_FIXED_POINT_SUPPORTED 328# define PNG_FIXED_EXPORT(ordinal, type, name, args)\ 329 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 330# endif 331#endif 332 333#include "png.h" 334 335/* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */ 336#ifndef PNG_DLL_EXPORT 337# define PNG_DLL_EXPORT 338#endif 339 340/* This is a global switch to set the compilation for an installed system 341 * (a release build). It can be set for testing debug builds to ensure that 342 * they will compile when the build type is switched to RC or STABLE, the 343 * default is just to use PNG_LIBPNG_BUILD_BASE_TYPE. Set this in CPPFLAGS 344 * with either: 345 * 346 * -DPNG_RELEASE_BUILD Turns on the release compile path 347 * -DPNG_RELEASE_BUILD=0 Turns it off 348 * or in your pngusr.h with 349 * #define PNG_RELEASE_BUILD=1 Turns on the release compile path 350 * #define PNG_RELEASE_BUILD=0 Turns it off 351 */ 352#ifndef PNG_RELEASE_BUILD 353# define PNG_RELEASE_BUILD (PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC) 354#endif 355 356/* SECURITY and SAFETY: 357 * 358 * libpng is built with support for internal limits on image dimensions and 359 * memory usage. These are documented in scripts/pnglibconf.dfa of the 360 * source and recorded in the machine generated header file pnglibconf.h. 361 */ 362 363/* If you are running on a machine where you cannot allocate more 364 * than 64K of memory at once, uncomment this. While libpng will not 365 * normally need that much memory in a chunk (unless you load up a very 366 * large file), zlib needs to know how big of a chunk it can use, and 367 * libpng thus makes sure to check any memory allocation to verify it 368 * will fit into memory. 369 * 370 * zlib provides 'MAXSEG_64K' which, if defined, indicates the 371 * same limit and pngconf.h (already included) sets the limit 372 * if certain operating systems are detected. 373 */ 374#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K) 375# define PNG_MAX_MALLOC_64K 376#endif 377 378#ifndef PNG_UNUSED 379/* Unused formal parameter warnings are silenced using the following macro 380 * which is expected to have no bad effects on performance (optimizing 381 * compilers will probably remove it entirely). Note that if you replace 382 * it with something other than whitespace, you must include the terminating 383 * semicolon. 384 */ 385# define PNG_UNUSED(param) (void)param; 386#endif 387 388/* Just a little check that someone hasn't tried to define something 389 * contradictory. 390 */ 391#if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K) 392# undef PNG_ZBUF_SIZE 393# define PNG_ZBUF_SIZE 65536L 394#endif 395 396/* If warnings or errors are turned off the code is disabled or redirected here. 397 * From 1.5.4 functions have been added to allow very limited formatting of 398 * error and warning messages - this code will also be disabled here. 399 */ 400#ifdef PNG_WARNINGS_SUPPORTED 401# define PNG_WARNING_PARAMETERS(p) png_warning_parameters p; 402#else 403# define png_warning_parameter(p,number,string) ((void)0) 404# define png_warning_parameter_unsigned(p,number,format,value) ((void)0) 405# define png_warning_parameter_signed(p,number,format,value) ((void)0) 406# define png_formatted_warning(pp,p,message) ((void)(pp)) 407# define PNG_WARNING_PARAMETERS(p) 408#endif 409#ifndef PNG_ERROR_TEXT_SUPPORTED 410# define png_fixed_error(s1,s2) png_err(s1) 411#endif 412 413/* C allows up-casts from (void*) to any pointer and (const void*) to any 414 * pointer to a const object. C++ regards this as a type error and requires an 415 * explicit, static, cast and provides the static_cast<> rune to ensure that 416 * const is not cast away. 417 */ 418#ifdef __cplusplus 419# define png_voidcast(type, value) static_cast<type>(value) 420# define png_constcast(type, value) const_cast<type>(value) 421# define png_aligncast(type, value) \ 422 static_cast<type>(static_cast<void*>(value)) 423# define png_aligncastconst(type, value) \ 424 static_cast<type>(static_cast<const void*>(value)) 425#else 426# define png_voidcast(type, value) (value) 427# define png_constcast(type, value) ((type)(value)) 428# define png_aligncast(type, value) ((void*)(value)) 429# define png_aligncastconst(type, value) ((const void*)(value)) 430#endif /* __cplusplus */ 431 432/* Some fixed point APIs are still required even if not exported because 433 * they get used by the corresponding floating point APIs. This magic 434 * deals with this: 435 */ 436#ifdef PNG_FIXED_POINT_SUPPORTED 437# define PNGFAPI PNGAPI 438#else 439# define PNGFAPI /* PRIVATE */ 440#endif 441 442#ifndef PNG_VERSION_INFO_ONLY 443/* Other defines specific to compilers can go here. Try to keep 444 * them inside an appropriate ifdef/endif pair for portability. 445 */ 446#if defined(PNG_FLOATING_POINT_SUPPORTED) ||\ 447 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) 448 /* png.c requires the following ANSI-C constants if the conversion of 449 * floating point to ASCII is implemented therein: 450 * 451 * DBL_DIG Maximum number of decimal digits (can be set to any constant) 452 * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value) 453 * DBL_MAX Maximum floating point number (can be set to an arbitrary value) 454 */ 455# include <float.h> 456 457# if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \ 458 defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC) 459 /* We need to check that <math.h> hasn't already been included earlier 460 * as it seems it doesn't agree with <fp.h>, yet we should really use 461 * <fp.h> if possible. 462 */ 463# if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__) 464# include <fp.h> 465# endif 466# else 467# include <math.h> 468# endif 469# if defined(_AMIGA) && defined(__SASC) && defined(_M68881) 470 /* Amiga SAS/C: We must include builtin FPU functions when compiling using 471 * MATH=68881 472 */ 473# include <m68881.h> 474# endif 475#endif 476 477/* This provides the non-ANSI (far) memory allocation routines. */ 478#if defined(__TURBOC__) && defined(__MSDOS__) 479# include <mem.h> 480# include <alloc.h> 481#endif 482 483#if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \ 484 defined(_WIN32) || defined(__WIN32__) 485# include <windows.h> /* defines _WINDOWS_ macro */ 486#endif 487#endif /* PNG_VERSION_INFO_ONLY */ 488 489/* Moved here around 1.5.0beta36 from pngconf.h */ 490/* Users may want to use these so they are not private. Any library 491 * functions that are passed far data must be model-independent. 492 */ 493 494/* Memory model/platform independent fns */ 495#ifndef PNG_ABORT 496# ifdef _WINDOWS_ 497# define PNG_ABORT() ExitProcess(0) 498# else 499# define PNG_ABORT() abort() 500# endif 501#endif 502 503/* These macros may need to be architecture dependent. */ 504#define PNG_ALIGN_NONE 0 /* do not use data alignment */ 505#define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */ 506#ifdef offsetof 507# define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */ 508#else 509# define PNG_ALIGN_OFFSET -1 /* prevent the use of this */ 510#endif 511#define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */ 512 513#ifndef PNG_ALIGN_TYPE 514 /* Default to using aligned access optimizations and requiring alignment to a 515 * multiple of the data type size. Override in a compiler specific fashion 516 * if necessary by inserting tests here: 517 */ 518# define PNG_ALIGN_TYPE PNG_ALIGN_SIZE 519#endif 520 521#if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE 522 /* This is used because in some compiler implementations non-aligned 523 * structure members are supported, so the offsetof approach below fails. 524 * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access 525 * is good for performance. Do not do this unless you have tested the result 526 * and understand it. 527 */ 528# define png_alignof(type) (sizeof (type)) 529#else 530# if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET 531# define png_alignof(type) offsetof(struct{char c; type t;}, t) 532# else 533# if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS 534# define png_alignof(type) (1) 535# endif 536 /* Else leave png_alignof undefined to prevent use thereof */ 537# endif 538#endif 539 540/* This implicitly assumes alignment is always to a power of 2. */ 541#ifdef png_alignof 542# define png_isaligned(ptr, type)\ 543 ((((const char*)ptr-(const char*)0) & (png_alignof(type)-1)) == 0) 544#else 545# define png_isaligned(ptr, type) 0 546#endif 547 548/* End of memory model/platform independent support */ 549/* End of 1.5.0beta36 move from pngconf.h */ 550 551/* CONSTANTS and UTILITY MACROS 552 * These are used internally by libpng and not exposed in the API 553 */ 554 555/* Various modes of operation. Note that after an init, mode is set to 556 * zero automatically when the structure is created. Three of these 557 * are defined in png.h because they need to be visible to applications 558 * that call png_set_unknown_chunk(). 559 */ 560/* #define PNG_HAVE_IHDR 0x01 (defined in png.h) */ 561/* #define PNG_HAVE_PLTE 0x02 (defined in png.h) */ 562#define PNG_HAVE_IDAT 0x04 563/* #define PNG_AFTER_IDAT 0x08 (defined in png.h) */ 564#define PNG_HAVE_IEND 0x10 565 /* 0x20 (unused) */ 566 /* 0x40 (unused) */ 567 /* 0x80 (unused) */ 568#define PNG_HAVE_CHUNK_HEADER 0x100 569#define PNG_WROTE_tIME 0x200 570#define PNG_WROTE_INFO_BEFORE_PLTE 0x400 571#define PNG_BACKGROUND_IS_GRAY 0x800 572#define PNG_HAVE_PNG_SIGNATURE 0x1000 573#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ 574 /* 0x4000 (unused) */ 575#define PNG_IS_READ_STRUCT 0x8000 /* Else is a write struct */ 576 577/* Flags for the transformations the PNG library does on the image data */ 578#define PNG_BGR 0x0001 579#define PNG_INTERLACE 0x0002 580#define PNG_PACK 0x0004 581#define PNG_SHIFT 0x0008 582#define PNG_SWAP_BYTES 0x0010 583#define PNG_INVERT_MONO 0x0020 584#define PNG_QUANTIZE 0x0040 585#define PNG_COMPOSE 0x0080 /* Was PNG_BACKGROUND */ 586#define PNG_BACKGROUND_EXPAND 0x0100 587#define PNG_EXPAND_16 0x0200 /* Added to libpng 1.5.2 */ 588#define PNG_16_TO_8 0x0400 /* Becomes 'chop' in 1.5.4 */ 589#define PNG_RGBA 0x0800 590#define PNG_EXPAND 0x1000 591#define PNG_GAMMA 0x2000 592#define PNG_GRAY_TO_RGB 0x4000 593#define PNG_FILLER 0x8000 594#define PNG_PACKSWAP 0x10000 595#define PNG_SWAP_ALPHA 0x20000 596#define PNG_STRIP_ALPHA 0x40000 597#define PNG_INVERT_ALPHA 0x80000 598#define PNG_USER_TRANSFORM 0x100000 599#define PNG_RGB_TO_GRAY_ERR 0x200000 600#define PNG_RGB_TO_GRAY_WARN 0x400000 601#define PNG_RGB_TO_GRAY 0x600000 /* two bits, RGB_TO_GRAY_ERR|WARN */ 602#define PNG_ENCODE_ALPHA 0x800000 /* Added to libpng-1.5.4 */ 603#define PNG_ADD_ALPHA 0x1000000 /* Added to libpng-1.2.7 */ 604#define PNG_EXPAND_tRNS 0x2000000 /* Added to libpng-1.2.9 */ 605#define PNG_SCALE_16_TO_8 0x4000000 /* Added to libpng-1.5.4 */ 606 /* 0x8000000 unused */ 607 /* 0x10000000 unused */ 608 /* 0x20000000 unused */ 609 /* 0x40000000 unused */ 610/* Flags for png_create_struct */ 611#define PNG_STRUCT_PNG 0x0001 612#define PNG_STRUCT_INFO 0x0002 613 614/* Flags for the png_ptr->flags rather than declaring a byte for each one */ 615#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 616#define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002 /* Added to libpng-1.6.0 */ 617 /* 0x0004 unused */ 618#define PNG_FLAG_ZSTREAM_ENDED 0x0008 /* Added to libpng-1.6.0 */ 619 /* 0x0010 unused */ 620 /* 0x0020 unused */ 621#define PNG_FLAG_ROW_INIT 0x0040 622#define PNG_FLAG_FILLER_AFTER 0x0080 623#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 624#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 625#define PNG_FLAG_CRC_CRITICAL_USE 0x0400 626#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 627#define PNG_FLAG_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.4 */ 628#define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.4 */ 629#define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.4 */ 630/* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000 */ 631/* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000 */ 632#define PNG_FLAG_LIBRARY_MISMATCH 0x20000 633#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000 634#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000 635#define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000 /* Added to libpng-1.4.0 */ 636#define PNG_FLAG_APP_WARNINGS_WARN 0x200000 /* Added to libpng-1.6.0 */ 637#define PNG_FLAG_APP_ERRORS_WARN 0x400000 /* Added to libpng-1.6.0 */ 638 /* 0x800000 unused */ 639 /* 0x1000000 unused */ 640 /* 0x2000000 unused */ 641 /* 0x4000000 unused */ 642 /* 0x8000000 unused */ 643 /* 0x10000000 unused */ 644 /* 0x20000000 unused */ 645 /* 0x40000000 unused */ 646 647#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 648 PNG_FLAG_CRC_ANCILLARY_NOWARN) 649 650#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 651 PNG_FLAG_CRC_CRITICAL_IGNORE) 652 653#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 654 PNG_FLAG_CRC_CRITICAL_MASK) 655 656/* Save typing and make code easier to understand */ 657 658#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 659 abs((int)((c1).green) - (int)((c2).green)) + \ 660 abs((int)((c1).blue) - (int)((c2).blue))) 661 662/* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255 663 * by dividing by 257 *with rounding*. This macro is exact for the given range. 664 * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the 665 * macro were established by experiment (modifying the added value). The macro 666 * has a second variant that takes a value already scaled by 255 and divides by 667 * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it 668 * only gives off-by-one errors and only for 0.5% (1 in 200) of the values. 669 */ 670#define PNG_DIV65535(v24) (((v24) + 32895) >> 16) 671#define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255) 672 673/* Added to libpng-1.2.6 JB */ 674#define PNG_ROWBYTES(pixel_bits, width) \ 675 ((pixel_bits) >= 8 ? \ 676 ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \ 677 (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) ) 678 679/* PNG_OUT_OF_RANGE returns true if value is outside the range 680 * ideal-delta..ideal+delta. Each argument is evaluated twice. 681 * "ideal" and "delta" should be constants, normally simple 682 * integers, "value" a variable. Added to libpng-1.2.6 JB 683 */ 684#define PNG_OUT_OF_RANGE(value, ideal, delta) \ 685 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 686 687/* Conversions between fixed and floating point, only defined if 688 * required (to make sure the code doesn't accidentally use float 689 * when it is supposedly disabled.) 690 */ 691#ifdef PNG_FLOATING_POINT_SUPPORTED 692/* The floating point conversion can't overflow, though it can and 693 * does lose accuracy relative to the original fixed point value. 694 * In practice this doesn't matter because png_fixed_point only 695 * stores numbers with very low precision. The png_ptr and s 696 * arguments are unused by default but are there in case error 697 * checking becomes a requirement. 698 */ 699#define png_float(png_ptr, fixed, s) (.00001 * (fixed)) 700 701/* The fixed point conversion performs range checking and evaluates 702 * its argument multiple times, so must be used with care. The 703 * range checking uses the PNG specification values for a signed 704 * 32-bit fixed point value except that the values are deliberately 705 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly 706 * (2^31-1) * 100000). 's' is a string that describes the value being 707 * converted. 708 * 709 * NOTE: this macro will raise a png_error if the range check fails, 710 * therefore it is normally only appropriate to use this on values 711 * that come from API calls or other sources where an out of range 712 * error indicates a programming error, not a data error! 713 * 714 * NOTE: by default this is off - the macro is not used - because the 715 * function call saves a lot of code. 716 */ 717#ifdef PNG_FIXED_POINT_MACRO_SUPPORTED 718#define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\ 719 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0)) 720#endif 721/* else the corresponding function is defined below, inside the scope of the 722 * cplusplus test. 723 */ 724#endif 725 726/* Constants for known chunk types. If you need to add a chunk, define the name 727 * here. For historical reasons these constants have the form png_<name>; i.e. 728 * the prefix is lower case. Please use decimal values as the parameters to 729 * match the ISO PNG specification and to avoid relying on the C locale 730 * interpretation of character values. 731 * 732 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values 733 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string 734 * to be generated if required. 735 * 736 * PNG_32b correctly produces a value shifted by up to 24 bits, even on 737 * architectures where (int) is only 16 bits. 738 */ 739#define PNG_32b(b,s) ((png_uint_32)(b) << (s)) 740#define PNG_U32(b1,b2,b3,b4) \ 741 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0)) 742 743/* Constants for known chunk types. 744 * 745 * MAINTAINERS: If you need to add a chunk, define the name here. 746 * For historical reasons these constants have the form png_<name>; i.e. 747 * the prefix is lower case. Please use decimal values as the parameters to 748 * match the ISO PNG specification and to avoid relying on the C locale 749 * interpretation of character values. Please keep the list sorted. 750 * 751 * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk 752 * type. In fact the specification does not express chunk types this way, 753 * however using a 32-bit value means that the chunk type can be read from the 754 * stream using exactly the same code as used for a 32-bit unsigned value and 755 * can be examined far more efficiently (using one arithmetic compare). 756 * 757 * Prior to 1.5.6 the chunk type constants were expressed as C strings. The 758 * libpng API still uses strings for 'unknown' chunks and a macro, 759 * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice 760 * that for portable code numeric values must still be used; the string "IHDR" 761 * is not portable and neither is PNG_U32('I', 'H', 'D', 'R'). 762 * 763 * In 1.7.0 the definitions will be made public in png.h to avoid having to 764 * duplicate the same definitions in application code. 765 */ 766#define png_IDAT PNG_U32( 73, 68, 65, 84) 767#define png_IEND PNG_U32( 73, 69, 78, 68) 768#define png_IHDR PNG_U32( 73, 72, 68, 82) 769#define png_PLTE PNG_U32( 80, 76, 84, 69) 770#define png_bKGD PNG_U32( 98, 75, 71, 68) 771#define png_cHRM PNG_U32( 99, 72, 82, 77) 772#define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */ 773#define png_gAMA PNG_U32(103, 65, 77, 65) 774#define png_gIFg PNG_U32(103, 73, 70, 103) 775#define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */ 776#define png_gIFx PNG_U32(103, 73, 70, 120) 777#define png_hIST PNG_U32(104, 73, 83, 84) 778#define png_iCCP PNG_U32(105, 67, 67, 80) 779#define png_iTXt PNG_U32(105, 84, 88, 116) 780#define png_oFFs PNG_U32(111, 70, 70, 115) 781#define png_pCAL PNG_U32(112, 67, 65, 76) 782#define png_pHYs PNG_U32(112, 72, 89, 115) 783#define png_sBIT PNG_U32(115, 66, 73, 84) 784#define png_sCAL PNG_U32(115, 67, 65, 76) 785#define png_sPLT PNG_U32(115, 80, 76, 84) 786#define png_sRGB PNG_U32(115, 82, 71, 66) 787#define png_sTER PNG_U32(115, 84, 69, 82) 788#define png_tEXt PNG_U32(116, 69, 88, 116) 789#define png_tIME PNG_U32(116, 73, 77, 69) 790#define png_tRNS PNG_U32(116, 82, 78, 83) 791#define png_zTXt PNG_U32(122, 84, 88, 116) 792 793/* The following will work on (signed char*) strings, whereas the get_uint_32 794 * macro will fail on top-bit-set values because of the sign extension. 795 */ 796#define PNG_CHUNK_FROM_STRING(s)\ 797 PNG_U32(0xff & (s)[0], 0xff & (s)[1], 0xff & (s)[2], 0xff & (s)[3]) 798 799/* This uses (char), not (png_byte) to avoid warnings on systems where (char) is 800 * signed and the argument is a (char[]) This macro will fail miserably on 801 * systems where (char) is more than 8 bits. 802 */ 803#define PNG_STRING_FROM_CHUNK(s,c)\ 804 (void)(((char*)(s))[0]=(char)(((c)>>24) & 0xff), \ 805 ((char*)(s))[1]=(char)(((c)>>16) & 0xff),\ 806 ((char*)(s))[2]=(char)(((c)>>8) & 0xff), \ 807 ((char*)(s))[3]=(char)((c & 0xff))) 808 809/* Do the same but terminate with a null character. */ 810#define PNG_CSTRING_FROM_CHUNK(s,c)\ 811 (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0) 812 813/* Test on flag values as defined in the spec (section 5.4): */ 814#define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29)) 815#define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c)) 816#define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21)) 817#define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13)) 818#define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5)) 819 820/* Gamma values (new at libpng-1.5.4): */ 821#define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */ 822#define PNG_GAMMA_MAC_INVERSE 65909 823#define PNG_GAMMA_sRGB_INVERSE 45455 824 825/* Almost everything below is C specific; the #defines above can be used in 826 * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot. 827 */ 828#ifndef PNG_VERSION_INFO_ONLY 829 830#include "pngstruct.h" 831#include "pnginfo.h" 832 833/* Validate the include paths - the include path used to generate pnglibconf.h 834 * must match that used in the build, or we must be using pnglibconf.h.prebuilt: 835 */ 836#if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM 837# error ZLIB_VERNUM != PNG_ZLIB_VERNUM \ 838 "-I (include path) error: see the notes in pngpriv.h" 839 /* This means that when pnglibconf.h was built the copy of zlib.h that it 840 * used is not the same as the one being used here. Because the build of 841 * libpng makes decisions to use inflateInit2 and inflateReset2 based on the 842 * zlib version number and because this affects handling of certain broken 843 * PNG files the -I directives must match. 844 * 845 * The most likely explanation is that you passed a -I in CFLAGS. This will 846 * not work; all the preprocessor directories and in particular all the -I 847 * directives must be in CPPFLAGS. 848 */ 849#endif 850 851/* This is used for 16-bit gamma tables -- only the top level pointers are 852 * const; this could be changed: 853 */ 854typedef const png_uint_16p * png_const_uint_16pp; 855 856/* Added to libpng-1.5.7: sRGB conversion tables */ 857#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 858 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 859#ifdef PNG_SIMPLIFIED_READ_SUPPORTED 860PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]); 861 /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value, 862 * 0..65535. This table gives the closest 16-bit answers (no errors). 863 */ 864#endif 865 866PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]); 867PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]); 868 869#define PNG_sRGB_FROM_LINEAR(linear) \ 870 ((png_byte)(0xff & ((png_sRGB_base[(linear)>>15] \ 871 + ((((linear) & 0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8))) 872 /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB 873 * encoded value with maximum error 0.646365. Note that the input is not a 874 * 16-bit value; it has been multiplied by 255! */ 875#endif /* SIMPLIFIED_READ/WRITE */ 876 877 878/* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 879#ifdef __cplusplus 880extern "C" { 881#endif /* __cplusplus */ 882 883/* Internal functions; these are not exported from a DLL however because they 884 * are used within several of the C source files they have to be C extern. 885 * 886 * All of these functions must be declared with PNG_INTERNAL_FUNCTION. 887 */ 888 889/* Zlib support */ 890#define PNG_UNEXPECTED_ZLIB_RETURN (-7) 891PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret), 892 PNG_EMPTY); 893 /* Used by the zlib handling functions to ensure that z_stream::msg is always 894 * set before they return. 895 */ 896 897#ifdef PNG_WRITE_SUPPORTED 898PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr, 899 png_compression_bufferp *list),PNG_EMPTY); 900 /* Free the buffer list used by the compressed write code. */ 901#endif 902 903#if defined(PNG_FLOATING_POINT_SUPPORTED) && \ 904 !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \ 905 (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \ 906 defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \ 907 defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \ 908 (defined(PNG_sCAL_SUPPORTED) && \ 909 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)) 910PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr, 911 double fp, png_const_charp text),PNG_EMPTY); 912#endif 913 914/* Check the user version string for compatibility, returns false if the version 915 * numbers aren't compatible. 916 */ 917PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr, 918 png_const_charp user_png_ver),PNG_EMPTY); 919 920/* Internal base allocator - no messages, NULL on failure to allocate. This 921 * does, however, call the application provided allocator and that could call 922 * png_error (although that would be a bug in the application implementation.) 923 */ 924PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr, 925 png_alloc_size_t size),PNG_ALLOCATED); 926 927#if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\ 928 defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED) 929/* Internal array allocator, outputs no error or warning messages on failure, 930 * just returns NULL. 931 */ 932PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr, 933 int nelements, size_t element_size),PNG_ALLOCATED); 934 935/* The same but an existing array is extended by add_elements. This function 936 * also memsets the new elements to 0 and copies the old elements. The old 937 * array is not freed or altered. 938 */ 939PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr, 940 png_const_voidp array, int old_elements, int add_elements, 941 size_t element_size),PNG_ALLOCATED); 942#endif /* text, sPLT or unknown chunks */ 943 944/* Magic to create a struct when there is no struct to call the user supplied 945 * memory allocators. Because error handling has not been set up the memory 946 * handlers can't safely call png_error, but this is an obscure and undocumented 947 * restriction so libpng has to assume that the 'free' handler, at least, might 948 * call png_error. 949 */ 950PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct, 951 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, 952 png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, 953 png_free_ptr free_fn),PNG_ALLOCATED); 954 955/* Free memory from internal libpng struct */ 956PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr), 957 PNG_EMPTY); 958 959/* Free an allocated jmp_buf (always succeeds) */ 960PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY); 961 962/* Function to allocate memory for zlib. PNGAPI is disallowed. */ 963PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size), 964 PNG_ALLOCATED); 965 966/* Function to free memory for zlib. PNGAPI is disallowed. */ 967PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY); 968 969/* Next four functions are used internally as callbacks. PNGCBAPI is required 970 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to 971 * PNGCBAPI at 1.5.0 972 */ 973 974PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr, 975 png_bytep data, png_size_t length),PNG_EMPTY); 976 977#ifdef PNG_PROGRESSIVE_READ_SUPPORTED 978PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr, 979 png_bytep buffer, png_size_t length),PNG_EMPTY); 980#endif 981 982PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr, 983 png_bytep data, png_size_t length),PNG_EMPTY); 984 985#ifdef PNG_WRITE_FLUSH_SUPPORTED 986# ifdef PNG_STDIO_SUPPORTED 987PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr), 988 PNG_EMPTY); 989# endif 990#endif 991 992/* Reset the CRC variable */ 993PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY); 994 995/* Write the "data" buffer to whatever output you are using */ 996PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr, 997 png_const_bytep data, png_size_t length),PNG_EMPTY); 998 999/* Read and check the PNG file signature */ 1000PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr, 1001 png_inforp info_ptr),PNG_EMPTY); 1002 1003/* Read the chunk header (length + type name) */ 1004PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr), 1005 PNG_EMPTY); 1006 1007/* Read data from whatever input you are using into the "data" buffer */ 1008PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data, 1009 png_size_t length),PNG_EMPTY); 1010 1011/* Read bytes into buf, and update png_ptr->crc */ 1012PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf, 1013 png_uint_32 length),PNG_EMPTY); 1014 1015/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 1016PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr, 1017 png_uint_32 skip),PNG_EMPTY); 1018 1019/* Read the CRC from the file and compare it to the libpng calculated CRC */ 1020PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY); 1021 1022/* Calculate the CRC over a section of data. Note that we are only 1023 * passing a maximum of 64K on systems that have this as a memory limit, 1024 * since this is the maximum buffer size we can specify. 1025 */ 1026PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr, 1027 png_const_bytep ptr, png_size_t length),PNG_EMPTY); 1028 1029#ifdef PNG_WRITE_FLUSH_SUPPORTED 1030PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY); 1031#endif 1032 1033/* Write various chunks */ 1034 1035/* Write the IHDR chunk, and update the png_struct with the necessary 1036 * information. 1037 */ 1038PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr, 1039 png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, 1040 int compression_method, int filter_method, int interlace_method),PNG_EMPTY); 1041 1042PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr, 1043 png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY); 1044 1045PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr, 1046 png_const_bytep row_data, png_alloc_size_t row_data_length, int flush), 1047 PNG_EMPTY); 1048 1049PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY); 1050 1051#ifdef PNG_WRITE_gAMA_SUPPORTED 1052PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr, 1053 png_fixed_point file_gamma),PNG_EMPTY); 1054#endif 1055 1056#ifdef PNG_WRITE_sBIT_SUPPORTED 1057PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr, 1058 png_const_color_8p sbit, int color_type),PNG_EMPTY); 1059#endif 1060 1061#ifdef PNG_WRITE_cHRM_SUPPORTED 1062PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr, 1063 const png_xy *xy), PNG_EMPTY); 1064 /* The xy value must have been previously validated */ 1065#endif 1066 1067#ifdef PNG_WRITE_sRGB_SUPPORTED 1068PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr, 1069 int intent),PNG_EMPTY); 1070#endif 1071 1072#ifdef PNG_WRITE_iCCP_SUPPORTED 1073PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr, 1074 png_const_charp name, png_const_bytep profile), PNG_EMPTY); 1075 /* The profile must have been previously validated for correctness, the 1076 * length comes from the first four bytes. Only the base, deflate, 1077 * compression is supported. 1078 */ 1079#endif 1080 1081#ifdef PNG_WRITE_sPLT_SUPPORTED 1082PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr, 1083 png_const_sPLT_tp palette),PNG_EMPTY); 1084#endif 1085 1086#ifdef PNG_WRITE_tRNS_SUPPORTED 1087PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr, 1088 png_const_bytep trans, png_const_color_16p values, int number, 1089 int color_type),PNG_EMPTY); 1090#endif 1091 1092#ifdef PNG_WRITE_bKGD_SUPPORTED 1093PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr, 1094 png_const_color_16p values, int color_type),PNG_EMPTY); 1095#endif 1096 1097#ifdef PNG_WRITE_hIST_SUPPORTED 1098PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr, 1099 png_const_uint_16p hist, int num_hist),PNG_EMPTY); 1100#endif 1101 1102/* Chunks that have keywords */ 1103#ifdef PNG_WRITE_tEXt_SUPPORTED 1104PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr, 1105 png_const_charp key, png_const_charp text, png_size_t text_len),PNG_EMPTY); 1106#endif 1107 1108#ifdef PNG_WRITE_zTXt_SUPPORTED 1109PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp 1110 key, png_const_charp text, int compression),PNG_EMPTY); 1111#endif 1112 1113#ifdef PNG_WRITE_iTXt_SUPPORTED 1114PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr, 1115 int compression, png_const_charp key, png_const_charp lang, 1116 png_const_charp lang_key, png_const_charp text),PNG_EMPTY); 1117#endif 1118 1119#ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ 1120PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr, 1121 png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY); 1122#endif 1123 1124#ifdef PNG_WRITE_oFFs_SUPPORTED 1125PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr, 1126 png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY); 1127#endif 1128 1129#ifdef PNG_WRITE_pCAL_SUPPORTED 1130PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr, 1131 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, 1132 png_const_charp units, png_charpp params),PNG_EMPTY); 1133#endif 1134 1135#ifdef PNG_WRITE_pHYs_SUPPORTED 1136PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr, 1137 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 1138 int unit_type),PNG_EMPTY); 1139#endif 1140 1141#ifdef PNG_WRITE_tIME_SUPPORTED 1142PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr, 1143 png_const_timep mod_time),PNG_EMPTY); 1144#endif 1145 1146#ifdef PNG_WRITE_sCAL_SUPPORTED 1147PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr, 1148 int unit, png_const_charp width, png_const_charp height),PNG_EMPTY); 1149#endif 1150 1151/* Called when finished processing a row of data */ 1152PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr), 1153 PNG_EMPTY); 1154 1155/* Internal use only. Called before first row of data */ 1156PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr), 1157 PNG_EMPTY); 1158 1159/* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an 1160 * array of png_ptr->width pixels. If the image is not interlaced or this 1161 * is the final pass this just does a memcpy, otherwise the "display" flag 1162 * is used to determine whether to copy pixels that are not in the current pass. 1163 * 1164 * Because 'png_do_read_interlace' (below) replicates pixels this allows this 1165 * function to achieve the documented 'blocky' appearance during interlaced read 1166 * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row' 1167 * are not changed if they are not in the current pass, when display is 0. 1168 * 1169 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless. 1170 * 1171 * The API always reads from the png_struct row buffer and always assumes that 1172 * it is full width (png_do_read_interlace has already been called.) 1173 * 1174 * This function is only ever used to write to row buffers provided by the 1175 * caller of the relevant libpng API and the row must have already been 1176 * transformed by the read transformations. 1177 * 1178 * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed 1179 * bitmasks for use within the code, otherwise runtime generated masks are used. 1180 * The default is compile time masks. 1181 */ 1182#ifndef PNG_USE_COMPILE_TIME_MASKS 1183# define PNG_USE_COMPILE_TIME_MASKS 1 1184#endif 1185PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr, 1186 png_bytep row, int display),PNG_EMPTY); 1187 1188#ifdef PNG_READ_INTERLACING_SUPPORTED 1189/* Expand an interlaced row: the 'row_info' describes the pass data that has 1190 * been read in and must correspond to the pixels in 'row', the pixels are 1191 * expanded (moved apart) in 'row' to match the final layout, when doing this 1192 * the pixels are *replicated* to the intervening space. This is essential for 1193 * the correct operation of png_combine_row, above. 1194 */ 1195PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info, 1196 png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY); 1197#endif 1198 1199/* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 1200 1201#ifdef PNG_WRITE_INTERLACING_SUPPORTED 1202/* Grab pixels out of a row for an interlaced pass */ 1203PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info, 1204 png_bytep row, int pass),PNG_EMPTY); 1205#endif 1206 1207/* Unfilter a row: check the filter value before calling this, there is no point 1208 * calling it for PNG_FILTER_VALUE_NONE. 1209 */ 1210PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop 1211 row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY); 1212 1213PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info, 1214 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1215PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop 1216 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1217PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop 1218 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1219PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop 1220 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1221PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop 1222 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1223PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop 1224 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1225PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop 1226 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1227 1228PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_sse2,(png_row_infop 1229 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1230PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_sse2,(png_row_infop 1231 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1232PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_sse2,(png_row_infop 1233 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1234PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_sse2,(png_row_infop 1235 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1236PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_sse2,(png_row_infop 1237 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1238PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_sse2,(png_row_infop 1239 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1240 1241/* Choose the best filter to use and filter the row data */ 1242PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr, 1243 png_row_infop row_info),PNG_EMPTY); 1244 1245#ifdef PNG_SEQUENTIAL_READ_SUPPORTED 1246PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr, 1247 png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY); 1248 /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer 1249 * is NULL the function checks, instead, for the end of the stream. In this 1250 * case a benign error will be issued if the stream end is not found or if 1251 * extra data has to be consumed. 1252 */ 1253PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr), 1254 PNG_EMPTY); 1255 /* This cleans up when the IDAT LZ stream does not end when the last image 1256 * byte is read; there is still some pending input. 1257 */ 1258 1259PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr), 1260 PNG_EMPTY); 1261 /* Finish a row while reading, dealing with interlacing passes, etc. */ 1262#endif /* SEQUENTIAL_READ */ 1263 1264/* Initialize the row buffers, etc. */ 1265PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY); 1266 1267#if PNG_ZLIB_VERNUM >= 0x1240 1268PNG_INTERNAL_FUNCTION(int,png_zlib_inflate,(png_structrp png_ptr, int flush), 1269 PNG_EMPTY); 1270# define PNG_INFLATE(pp, flush) png_zlib_inflate(pp, flush) 1271#else /* Zlib < 1.2.4 */ 1272# define PNG_INFLATE(pp, flush) inflate(&(pp)->zstream, flush) 1273#endif /* Zlib < 1.2.4 */ 1274 1275#ifdef PNG_READ_TRANSFORMS_SUPPORTED 1276/* Optional call to update the users info structure */ 1277PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr, 1278 png_inforp info_ptr),PNG_EMPTY); 1279#endif 1280 1281/* Shared transform functions, defined in pngtran.c */ 1282#if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 1283 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 1284PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info, 1285 png_bytep row, int at_start),PNG_EMPTY); 1286#endif 1287 1288#ifdef PNG_16BIT_SUPPORTED 1289#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 1290PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info, 1291 png_bytep row),PNG_EMPTY); 1292#endif 1293#endif 1294 1295#if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ 1296 defined(PNG_WRITE_PACKSWAP_SUPPORTED) 1297PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info, 1298 png_bytep row),PNG_EMPTY); 1299#endif 1300 1301#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 1302PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info, 1303 png_bytep row),PNG_EMPTY); 1304#endif 1305 1306#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1307PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info, 1308 png_bytep row),PNG_EMPTY); 1309#endif 1310 1311/* The following decodes the appropriate chunks, and does error correction, 1312 * then calls the appropriate callback for the chunk if it is valid. 1313 */ 1314 1315/* Decode the IHDR chunk */ 1316PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr, 1317 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1318PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr, 1319 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1320PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr, 1321 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1322 1323#ifdef PNG_READ_bKGD_SUPPORTED 1324PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr, 1325 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1326#endif 1327 1328#ifdef PNG_READ_cHRM_SUPPORTED 1329PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr, 1330 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1331#endif 1332 1333#ifdef PNG_READ_gAMA_SUPPORTED 1334PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr, 1335 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1336#endif 1337 1338#ifdef PNG_READ_hIST_SUPPORTED 1339PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr, 1340 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1341#endif 1342 1343#ifdef PNG_READ_iCCP_SUPPORTED 1344PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr, 1345 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1346#endif /* READ_iCCP */ 1347 1348#ifdef PNG_READ_iTXt_SUPPORTED 1349PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr, 1350 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1351#endif 1352 1353#ifdef PNG_READ_oFFs_SUPPORTED 1354PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr, 1355 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1356#endif 1357 1358#ifdef PNG_READ_pCAL_SUPPORTED 1359PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr, 1360 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1361#endif 1362 1363#ifdef PNG_READ_pHYs_SUPPORTED 1364PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr, 1365 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1366#endif 1367 1368#ifdef PNG_READ_sBIT_SUPPORTED 1369PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr, 1370 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1371#endif 1372 1373#ifdef PNG_READ_sCAL_SUPPORTED 1374PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr, 1375 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1376#endif 1377 1378#ifdef PNG_READ_sPLT_SUPPORTED 1379PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr, 1380 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1381#endif /* READ_sPLT */ 1382 1383#ifdef PNG_READ_sRGB_SUPPORTED 1384PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr, 1385 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1386#endif 1387 1388#ifdef PNG_READ_tEXt_SUPPORTED 1389PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr, 1390 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1391#endif 1392 1393#ifdef PNG_READ_tIME_SUPPORTED 1394PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr, 1395 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1396#endif 1397 1398#ifdef PNG_READ_tRNS_SUPPORTED 1399PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr, 1400 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1401#endif 1402 1403#ifdef PNG_READ_zTXt_SUPPORTED 1404PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr, 1405 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1406#endif 1407 1408PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_structrp png_ptr, 1409 png_uint_32 chunk_name),PNG_EMPTY); 1410 1411PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr, 1412 png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY); 1413 /* This is the function that gets called for unknown chunks. The 'keep' 1414 * argument is either non-zero for a known chunk that has been set to be 1415 * handled as unknown or zero for an unknown chunk. By default the function 1416 * just skips the chunk or errors out if it is critical. 1417 */ 1418 1419#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\ 1420 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 1421PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling, 1422 (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY); 1423 /* Exactly as the API png_handle_as_unknown() except that the argument is a 1424 * 32-bit chunk name, not a string. 1425 */ 1426#endif /* READ_UNKNOWN_CHUNKS || HANDLE_AS_UNKNOWN */ 1427 1428/* Handle the transformations for reading and writing */ 1429#ifdef PNG_READ_TRANSFORMS_SUPPORTED 1430PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr, 1431 png_row_infop row_info),PNG_EMPTY); 1432#endif 1433#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED 1434PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr, 1435 png_row_infop row_info),PNG_EMPTY); 1436#endif 1437 1438#ifdef PNG_READ_TRANSFORMS_SUPPORTED 1439PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr), 1440 PNG_EMPTY); 1441#endif 1442 1443#ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1444PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr, 1445 png_inforp info_ptr),PNG_EMPTY); 1446PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr, 1447 png_inforp info_ptr),PNG_EMPTY); 1448PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY); 1449PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr), 1450 PNG_EMPTY); 1451PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr, 1452 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); 1453PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY); 1454PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr, 1455 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); 1456PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr), 1457 PNG_EMPTY); 1458PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr, 1459 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1460PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr, 1461 png_inforp info_ptr),PNG_EMPTY); 1462PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr, 1463 png_inforp info_ptr),PNG_EMPTY); 1464PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr, 1465 png_bytep row),PNG_EMPTY); 1466PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr, 1467 png_inforp info_ptr),PNG_EMPTY); 1468PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr, 1469 png_inforp info_ptr),PNG_EMPTY); 1470PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr), 1471 PNG_EMPTY); 1472# ifdef PNG_READ_tEXt_SUPPORTED 1473PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr, 1474 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1475PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr, 1476 png_inforp info_ptr),PNG_EMPTY); 1477# endif 1478# ifdef PNG_READ_zTXt_SUPPORTED 1479PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr, 1480 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1481PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr, 1482 png_inforp info_ptr),PNG_EMPTY); 1483# endif 1484# ifdef PNG_READ_iTXt_SUPPORTED 1485PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr, 1486 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1487PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr, 1488 png_inforp info_ptr),PNG_EMPTY); 1489# endif 1490 1491#endif /* PROGRESSIVE_READ */ 1492 1493/* Added at libpng version 1.6.0 */ 1494#ifdef PNG_GAMMA_SUPPORTED 1495PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr, 1496 png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY); 1497 /* Set the colorspace gamma with a value provided by the application or by 1498 * the gAMA chunk on read. The value will override anything set by an ICC 1499 * profile. 1500 */ 1501 1502PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr, 1503 png_inforp info_ptr), PNG_EMPTY); 1504 /* Synchronize the info 'valid' flags with the colorspace */ 1505 1506PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr, 1507 png_inforp info_ptr), PNG_EMPTY); 1508 /* Copy the png_struct colorspace to the info_struct and call the above to 1509 * synchronize the flags. Checks for NULL info_ptr and does nothing. 1510 */ 1511#endif 1512 1513/* Added at libpng version 1.4.0 */ 1514#ifdef PNG_COLORSPACE_SUPPORTED 1515/* These internal functions are for maintaining the colorspace structure within 1516 * a png_info or png_struct (or, indeed, both). 1517 */ 1518PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities, 1519 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy, 1520 int preferred), PNG_EMPTY); 1521 1522PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints, 1523 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ, 1524 int preferred), PNG_EMPTY); 1525 1526#ifdef PNG_sRGB_SUPPORTED 1527PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr, 1528 png_colorspacerp colorspace, int intent), PNG_EMPTY); 1529 /* This does set the colorspace gAMA and cHRM values too, but doesn't set the 1530 * flags to write them, if it returns false there was a problem and an error 1531 * message has already been output (but the colorspace may still need to be 1532 * synced to record the invalid flag). 1533 */ 1534#endif /* sRGB */ 1535 1536#ifdef PNG_iCCP_SUPPORTED 1537PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr, 1538 png_colorspacerp colorspace, png_const_charp name, 1539 png_uint_32 profile_length, png_const_bytep profile, int color_type), 1540 PNG_EMPTY); 1541 /* The 'name' is used for information only */ 1542 1543/* Routines for checking parts of an ICC profile. */ 1544PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr, 1545 png_colorspacerp colorspace, png_const_charp name, 1546 png_uint_32 profile_length), PNG_EMPTY); 1547PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr, 1548 png_colorspacerp colorspace, png_const_charp name, 1549 png_uint_32 profile_length, 1550 png_const_bytep profile /* first 132 bytes only */, int color_type), 1551 PNG_EMPTY); 1552PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr, 1553 png_colorspacerp colorspace, png_const_charp name, 1554 png_uint_32 profile_length, 1555 png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY); 1556#ifdef PNG_sRGB_SUPPORTED 1557PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,( 1558 png_const_structrp png_ptr, png_colorspacerp colorspace, 1559 png_const_bytep profile, uLong adler), PNG_EMPTY); 1560 /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may 1561 * be zero to indicate that it is not available. It is used, if provided, 1562 * as a fast check on the profile when checking to see if it is sRGB. 1563 */ 1564#endif 1565#endif /* iCCP */ 1566 1567#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1568PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients, 1569 (png_structrp png_ptr), PNG_EMPTY); 1570 /* Set the rgb_to_gray coefficients from the colorspace Y values */ 1571#endif /* READ_RGB_TO_GRAY */ 1572#endif /* COLORSPACE */ 1573 1574/* Added at libpng version 1.4.0 */ 1575PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr, 1576 png_uint_32 width, png_uint_32 height, int bit_depth, 1577 int color_type, int interlace_type, int compression_type, 1578 int filter_type),PNG_EMPTY); 1579 1580/* Added at libpng version 1.5.10 */ 1581#if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \ 1582 defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED) 1583PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes, 1584 (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY); 1585#endif 1586 1587#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) 1588PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr, 1589 png_const_charp name),PNG_NORETURN); 1590#endif 1591 1592/* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite 1593 * the end. Always leaves the buffer nul terminated. Never errors out (and 1594 * there is no error code.) 1595 */ 1596PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize, 1597 size_t pos, png_const_charp string),PNG_EMPTY); 1598 1599/* Various internal functions to handle formatted warning messages, currently 1600 * only implemented for warnings. 1601 */ 1602#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) 1603/* Utility to dump an unsigned value into a buffer, given a start pointer and 1604 * and end pointer (which should point just *beyond* the end of the buffer!) 1605 * Returns the pointer to the start of the formatted string. This utility only 1606 * does unsigned values. 1607 */ 1608PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start, 1609 png_charp end, int format, png_alloc_size_t number),PNG_EMPTY); 1610 1611/* Convenience macro that takes an array: */ 1612#define PNG_FORMAT_NUMBER(buffer,format,number) \ 1613 png_format_number(buffer, buffer + (sizeof buffer), format, number) 1614 1615/* Suggested size for a number buffer (enough for 64 bits and a sign!) */ 1616#define PNG_NUMBER_BUFFER_SIZE 24 1617 1618/* These are the integer formats currently supported, the name is formed from 1619 * the standard printf(3) format string. 1620 */ 1621#define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */ 1622#define PNG_NUMBER_FORMAT_02u 2 1623#define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */ 1624#define PNG_NUMBER_FORMAT_02d 2 1625#define PNG_NUMBER_FORMAT_x 3 1626#define PNG_NUMBER_FORMAT_02x 4 1627#define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */ 1628#endif 1629 1630#ifdef PNG_WARNINGS_SUPPORTED 1631/* New defines and members adding in libpng-1.5.4 */ 1632# define PNG_WARNING_PARAMETER_SIZE 32 1633# define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */ 1634 1635/* An l-value of this type has to be passed to the APIs below to cache the 1636 * values of the parameters to a formatted warning message. 1637 */ 1638typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][ 1639 PNG_WARNING_PARAMETER_SIZE]; 1640 1641PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p, 1642 int number, png_const_charp string),PNG_EMPTY); 1643 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters, 1644 * including the trailing '\0'. 1645 */ 1646PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned, 1647 (png_warning_parameters p, int number, int format, png_alloc_size_t value), 1648 PNG_EMPTY); 1649 /* Use png_alloc_size_t because it is an unsigned type as big as any we 1650 * need to output. Use the following for a signed value. 1651 */ 1652PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed, 1653 (png_warning_parameters p, int number, int format, png_int_32 value), 1654 PNG_EMPTY); 1655 1656PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr, 1657 png_warning_parameters p, png_const_charp message),PNG_EMPTY); 1658 /* 'message' follows the X/Open approach of using @1, @2 to insert 1659 * parameters previously supplied using the above functions. Errors in 1660 * specifying the parameters will simply result in garbage substitutions. 1661 */ 1662#endif 1663 1664#ifdef PNG_BENIGN_ERRORS_SUPPORTED 1665/* Application errors (new in 1.6); use these functions (declared below) for 1666 * errors in the parameters or order of API function calls on read. The 1667 * 'warning' should be used for an error that can be handled completely; the 1668 * 'error' for one which can be handled safely but which may lose application 1669 * information or settings. 1670 * 1671 * By default these both result in a png_error call prior to release, while in a 1672 * released version the 'warning' is just a warning. However if the application 1673 * explicitly disables benign errors (explicitly permitting the code to lose 1674 * information) they both turn into warnings. 1675 * 1676 * If benign errors aren't supported they end up as the corresponding base call 1677 * (png_warning or png_error.) 1678 */ 1679PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr, 1680 png_const_charp message),PNG_EMPTY); 1681 /* The application provided invalid parameters to an API function or called 1682 * an API function at the wrong time, libpng can completely recover. 1683 */ 1684 1685PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr, 1686 png_const_charp message),PNG_EMPTY); 1687 /* As above but libpng will ignore the call, or attempt some other partial 1688 * recovery from the error. 1689 */ 1690#else 1691# define png_app_warning(pp,s) png_warning(pp,s) 1692# define png_app_error(pp,s) png_error(pp,s) 1693#endif 1694 1695PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr, 1696 png_const_charp message, int error),PNG_EMPTY); 1697 /* Report a recoverable issue in chunk data. On read this is used to report 1698 * a problem found while reading a particular chunk and the 1699 * png_chunk_benign_error or png_chunk_warning function is used as 1700 * appropriate. On write this is used to report an error that comes from 1701 * data set via an application call to a png_set_ API and png_app_error or 1702 * png_app_warning is used as appropriate. 1703 * 1704 * The 'error' parameter must have one of the following values: 1705 */ 1706#define PNG_CHUNK_WARNING 0 /* never an error */ 1707#define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */ 1708#define PNG_CHUNK_ERROR 2 /* always an error */ 1709 1710/* ASCII to FP interfaces, currently only implemented if sCAL 1711 * support is required. 1712 */ 1713#if defined(PNG_sCAL_SUPPORTED) 1714/* MAX_DIGITS is actually the maximum number of characters in an sCAL 1715 * width or height, derived from the precision (number of significant 1716 * digits - a build time settable option) and assumptions about the 1717 * maximum ridiculous exponent. 1718 */ 1719#define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/) 1720 1721#ifdef PNG_FLOATING_POINT_SUPPORTED 1722PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr, 1723 png_charp ascii, png_size_t size, double fp, unsigned int precision), 1724 PNG_EMPTY); 1725#endif /* FLOATING_POINT */ 1726 1727#ifdef PNG_FIXED_POINT_SUPPORTED 1728PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr, 1729 png_charp ascii, png_size_t size, png_fixed_point fp),PNG_EMPTY); 1730#endif /* FIXED_POINT */ 1731#endif /* sCAL */ 1732 1733#if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) 1734/* An internal API to validate the format of a floating point number. 1735 * The result is the index of the next character. If the number is 1736 * not valid it will be the index of a character in the supposed number. 1737 * 1738 * The format of a number is defined in the PNG extensions specification 1739 * and this API is strictly conformant to that spec, not anyone elses! 1740 * 1741 * The format as a regular expression is: 1742 * 1743 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)? 1744 * 1745 * or: 1746 * 1747 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)? 1748 * 1749 * The complexity is that either integer or fraction must be present and the 1750 * fraction is permitted to have no digits only if the integer is present. 1751 * 1752 * NOTE: The dangling E problem. 1753 * There is a PNG valid floating point number in the following: 1754 * 1755 * PNG floating point numbers are not greedy. 1756 * 1757 * Working this out requires *TWO* character lookahead (because of the 1758 * sign), the parser does not do this - it will fail at the 'r' - this 1759 * doesn't matter for PNG sCAL chunk values, but it requires more care 1760 * if the value were ever to be embedded in something more complex. Use 1761 * ANSI-C strtod if you need the lookahead. 1762 */ 1763/* State table for the parser. */ 1764#define PNG_FP_INTEGER 0 /* before or in integer */ 1765#define PNG_FP_FRACTION 1 /* before or in fraction */ 1766#define PNG_FP_EXPONENT 2 /* before or in exponent */ 1767#define PNG_FP_STATE 3 /* mask for the above */ 1768#define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */ 1769#define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */ 1770#define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */ 1771#define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */ 1772#define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */ 1773 1774/* These three values don't affect the parser. They are set but not used. 1775 */ 1776#define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */ 1777#define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */ 1778#define PNG_FP_NONZERO 256 /* A non-zero value */ 1779#define PNG_FP_STICKY 448 /* The above three flags */ 1780 1781/* This is available for the caller to store in 'state' if required. Do not 1782 * call the parser after setting it (the parser sometimes clears it.) 1783 */ 1784#define PNG_FP_INVALID 512 /* Available for callers as a distinct value */ 1785 1786/* Result codes for the parser (boolean - true meants ok, false means 1787 * not ok yet.) 1788 */ 1789#define PNG_FP_MAYBE 0 /* The number may be valid in the future */ 1790#define PNG_FP_OK 1 /* The number is valid */ 1791 1792/* Tests on the sticky non-zero and negative flags. To pass these checks 1793 * the state must also indicate that the whole number is valid - this is 1794 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this 1795 * is equivalent to PNG_FP_OK above.) 1796 */ 1797#define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO) 1798 /* NZ_MASK: the string is valid and a non-zero negative value */ 1799#define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO) 1800 /* Z MASK: the string is valid and a non-zero value. */ 1801 /* PNG_FP_SAW_DIGIT: the string is valid. */ 1802#define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT) 1803#define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK) 1804#define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK) 1805 1806/* The actual parser. This can be called repeatedly. It updates 1807 * the index into the string and the state variable (which must 1808 * be initialized to 0). It returns a result code, as above. There 1809 * is no point calling the parser any more if it fails to advance to 1810 * the end of the string - it is stuck on an invalid character (or 1811 * terminated by '\0'). 1812 * 1813 * Note that the pointer will consume an E or even an E+ and then leave 1814 * a 'maybe' state even though a preceding integer.fraction is valid. 1815 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was 1816 * a valid number. It's possible to recover from this by calling 1817 * the parser again (from the start, with state 0) but with a string 1818 * that omits the last character (i.e. set the size to the index of 1819 * the problem character.) This has not been tested within libpng. 1820 */ 1821PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string, 1822 png_size_t size, int *statep, png_size_tp whereami),PNG_EMPTY); 1823 1824/* This is the same but it checks a complete string and returns true 1825 * only if it just contains a floating point number. As of 1.5.4 this 1826 * function also returns the state at the end of parsing the number if 1827 * it was valid (otherwise it returns 0.) This can be used for testing 1828 * for negative or zero values using the sticky flag. 1829 */ 1830PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string, 1831 png_size_t size),PNG_EMPTY); 1832#endif /* pCAL || sCAL */ 1833 1834#if defined(PNG_GAMMA_SUPPORTED) ||\ 1835 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED) 1836/* Added at libpng version 1.5.0 */ 1837/* This is a utility to provide a*times/div (rounded) and indicate 1838 * if there is an overflow. The result is a boolean - false (0) 1839 * for overflow, true (1) if no overflow, in which case *res 1840 * holds the result. 1841 */ 1842PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a, 1843 png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY); 1844#endif 1845 1846#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED) 1847/* Same deal, but issue a warning on overflow and return 0. */ 1848PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn, 1849 (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by, 1850 png_int_32 divided_by),PNG_EMPTY); 1851#endif 1852 1853#ifdef PNG_GAMMA_SUPPORTED 1854/* Calculate a reciprocal - used for gamma values. This returns 1855 * 0 if the argument is 0 in order to maintain an undefined value; 1856 * there are no warnings. 1857 */ 1858PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a), 1859 PNG_EMPTY); 1860 1861#ifdef PNG_READ_GAMMA_SUPPORTED 1862/* The same but gives a reciprocal of the product of two fixed point 1863 * values. Accuracy is suitable for gamma calculations but this is 1864 * not exact - use png_muldiv for that. Only required at present on read. 1865 */ 1866PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a, 1867 png_fixed_point b),PNG_EMPTY); 1868#endif 1869 1870/* Return true if the gamma value is significantly different from 1.0 */ 1871PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value), 1872 PNG_EMPTY); 1873#endif 1874 1875#ifdef PNG_READ_GAMMA_SUPPORTED 1876/* Internal fixed point gamma correction. These APIs are called as 1877 * required to convert single values - they don't need to be fast, 1878 * they are not used when processing image pixel values. 1879 * 1880 * While the input is an 'unsigned' value it must actually be the 1881 * correct bit value - 0..255 or 0..65535 as required. 1882 */ 1883PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr, 1884 unsigned int value, png_fixed_point gamma_value),PNG_EMPTY); 1885PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value, 1886 png_fixed_point gamma_value),PNG_EMPTY); 1887PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value, 1888 png_fixed_point gamma_value),PNG_EMPTY); 1889PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr), 1890 PNG_EMPTY); 1891PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr, 1892 int bit_depth),PNG_EMPTY); 1893#endif 1894 1895/* SIMPLIFIED READ/WRITE SUPPORT */ 1896#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 1897 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 1898/* The internal structure that png_image::opaque points to. */ 1899typedef struct png_control 1900{ 1901 png_structp png_ptr; 1902 png_infop info_ptr; 1903 png_voidp error_buf; /* Always a jmp_buf at present. */ 1904 1905 png_const_bytep memory; /* Memory buffer. */ 1906 png_size_t size; /* Size of the memory buffer. */ 1907 1908 unsigned int for_write :1; /* Otherwise it is a read structure */ 1909 unsigned int owned_file :1; /* We own the file in io_ptr */ 1910} png_control; 1911 1912/* Return the pointer to the jmp_buf from a png_control: necessary because C 1913 * does not reveal the type of the elements of jmp_buf. 1914 */ 1915#ifdef __cplusplus 1916# define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0]) 1917#else 1918# define png_control_jmp_buf(pc) ((pc)->error_buf) 1919#endif 1920 1921/* Utility to safely execute a piece of libpng code catching and logging any 1922 * errors that might occur. Returns true on success, false on failure (either 1923 * of the function or as a result of a png_error.) 1924 */ 1925PNG_INTERNAL_CALLBACK(void,png_safe_error,(png_structp png_ptr, 1926 png_const_charp error_message),PNG_NORETURN); 1927 1928#ifdef PNG_WARNINGS_SUPPORTED 1929PNG_INTERNAL_CALLBACK(void,png_safe_warning,(png_structp png_ptr, 1930 png_const_charp warning_message),PNG_EMPTY); 1931#else 1932# define png_safe_warning 0/*dummy argument*/ 1933#endif 1934 1935PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image, 1936 int (*function)(png_voidp), png_voidp arg),PNG_EMPTY); 1937 1938/* Utility to log an error; this also cleans up the png_image; the function 1939 * always returns 0 (false). 1940 */ 1941PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image, 1942 png_const_charp error_message),PNG_EMPTY); 1943 1944#ifndef PNG_SIMPLIFIED_READ_SUPPORTED 1945/* png_image_free is used by the write code but not exported */ 1946PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY); 1947#endif /* !SIMPLIFIED_READ */ 1948 1949#endif /* SIMPLIFIED READ/WRITE */ 1950 1951/* These are initialization functions for hardware specific PNG filter 1952 * optimizations; list these here then select the appropriate one at compile 1953 * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined 1954 * the generic code is used. 1955 */ 1956#ifdef PNG_FILTER_OPTIMIZATIONS 1957PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr, 1958 unsigned int bpp), PNG_EMPTY); 1959 /* Just declare the optimization that will be used */ 1960#else 1961 /* List *all* the possible optimizations here - this branch is required if 1962 * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in 1963 * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing. 1964 */ 1965PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon, 1966 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 1967PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_sse2, 1968 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 1969#endif 1970 1971PNG_INTERNAL_FUNCTION(png_uint_32, png_check_keyword, (png_structrp png_ptr, 1972 png_const_charp key, png_bytep new_key), PNG_EMPTY); 1973 1974/* Maintainer: Put new private prototypes here ^ */ 1975 1976#include "pngdebug.h" 1977 1978#ifdef __cplusplus 1979} 1980#endif 1981 1982#endif /* PNG_VERSION_INFO_ONLY */ 1983#endif /* PNGPRIV_H */ 1984