1 2/* pngpriv.h - private declarations for use inside libpng 3 * 4 * For conditions of distribution and use, see copyright notice in png.h 5 * Copyright (c) 1998-2014 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 * Last changed in libpng 1.6.10 [March 6, 2014] 10 * 11 * This code is released under the libpng license. 12 * For conditions of distribution and use, see the disclaimer 13 * and license in png.h 14 */ 15 16/* The symbols declared in this file (including the functions declared 17 * as extern) are PRIVATE. They are not part of the libpng public 18 * interface, and are not recommended for use by regular applications. 19 * Some of them may become public in the future; others may stay private, 20 * change in an incompatible way, or even disappear. 21 * Although the libpng users are not forbidden to include this header, 22 * they should be well aware of the issues that may arise from doing so. 23 */ 24 25#ifndef PNGPRIV_H 26#define PNGPRIV_H 27 28/* Feature Test Macros. The following are defined here to ensure that correctly 29 * implemented libraries reveal the APIs libpng needs to build and hide those 30 * that are not needed and potentially damaging to the compilation. 31 * 32 * Feature Test Macros must be defined before any system header is included (see 33 * POSIX 1003.1 2.8.2 "POSIX Symbols." 34 * 35 * These macros only have an effect if the operating system supports either 36 * POSIX 1003.1 or C99, or both. On other operating systems (particularly 37 * Windows/Visual Studio) there is no effect; the OS specific tests below are 38 * still required (as of 2011-05-02.) 39 */ 40#define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */ 41 42#ifndef PNG_VERSION_INFO_ONLY 43/* Standard library headers not required by png.h: */ 44# include <stdlib.h> 45# include <string.h> 46#endif 47 48#define PNGLIB_BUILD /*libpng is being built, not used*/ 49 50/* If HAVE_CONFIG_H is defined during the build then the build system must 51 * provide an appropriate "config.h" file on the include path. The header file 52 * must provide definitions as required below (search for "HAVE_CONFIG_H"); 53 * see configure.ac for more details of the requirements. The macro 54 * "PNG_NO_CONFIG_H" is provided for maintainers to test for dependencies on 55 * 'configure'; define this macro to prevent the configure build including the 56 * configure generated config.h. Libpng is expected to compile without *any* 57 * special build system support on a reasonably ANSI-C compliant system. 58 */ 59#if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H) 60# include <config.h> 61 62 /* Pick up the definition of 'restrict' from config.h if it was read: */ 63# define PNG_RESTRICT restrict 64#endif 65 66/* To support symbol prefixing it is necessary to know *before* including png.h 67 * whether the fixed point (and maybe other) APIs are exported, because if they 68 * are not internal definitions may be required. This is handled below just 69 * before png.h is included, but load the configuration now if it is available. 70 */ 71#ifndef PNGLCONF_H 72# include "pnglibconf.h" 73#endif 74 75/* Local renames may change non-exported API functions from png.h */ 76#if defined(PNG_PREFIX) && !defined(PNGPREFIX_H) 77# include "pngprefix.h" 78#endif 79 80#ifdef PNG_USER_CONFIG 81# include "pngusr.h" 82 /* These should have been defined in pngusr.h */ 83# ifndef PNG_USER_PRIVATEBUILD 84# define PNG_USER_PRIVATEBUILD "Custom libpng build" 85# endif 86# ifndef PNG_USER_DLLFNAME_POSTFIX 87# define PNG_USER_DLLFNAME_POSTFIX "Cb" 88# endif 89#endif 90 91/* Compile time options. 92 * ===================== 93 * In a multi-arch build the compiler may compile the code several times for the 94 * same object module, producing different binaries for different architectures. 95 * When this happens configure-time setting of the target host options cannot be 96 * done and this interferes with the handling of the ARM NEON optimizations, and 97 * possibly other similar optimizations. Put additional tests here; in general 98 * this is needed when the same option can be changed at both compile time and 99 * run time depending on the target OS (i.e. iOS vs Android.) 100 * 101 * NOTE: symbol prefixing does not pass $(CFLAGS) to the preprocessor, because 102 * this is not possible with certain compilers (Oracle SUN OS CC), as a result 103 * it is necessary to ensure that all extern functions that *might* be used 104 * regardless of $(CFLAGS) get declared in this file. The test on __ARM_NEON__ 105 * below is one example of this behavior because it is controlled by the 106 * presence or not of -mfpu=neon on the GCC command line, it is possible to do 107 * this in $(CC), e.g. "CC=gcc -mfpu=neon", but people who build libpng rarely 108 * do this. 109 */ 110#ifndef PNG_ARM_NEON_OPT 111 /* ARM NEON optimizations are being controlled by the compiler settings, 112 * typically the target FPU. If the FPU has been set to NEON (-mfpu=neon 113 * with GCC) then the compiler will define __ARM_NEON__ and we can rely 114 * unconditionally on NEON instructions not crashing, otherwise we must 115 * disable use of NEON instructions. 116 * 117 * NOTE: at present these optimizations depend on 'ALIGNED_MEMORY', so they 118 * can only be turned on automatically if that is supported too. If 119 * PNG_ARM_NEON_OPT is set in CPPFLAGS (to >0) then arm/arm_init.c will fail 120 * to compile with an appropriate #error if ALIGNED_MEMORY has been turned 121 * off. 122 * 123 * Note that gcc-4.9 defines __ARM_NEON instead of __ARM_NEON__, so we 124 * check both variants. 125 */ 126# if (defined(__ARM_NEON__) || defined(__ARM_NEON)) && \ 127 defined(PNG_ALIGNED_MEMORY_SUPPORTED) 128# define PNG_ARM_NEON_OPT 2 129# else 130# define PNG_ARM_NEON_OPT 0 131# endif 132#endif 133 134#if PNG_ARM_NEON_OPT > 0 135 /* NEON optimizations are to be at least considered by libpng, so enable the 136 * callbacks to do this. 137 */ 138# define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_neon 139 140 /* By default the 'intrinsics' code in arm/filter_neon_intrinsics.c is used 141 * if possible - if __ARM_NEON__ is set and the compiler version is not known 142 * to be broken. This is controlled by PNG_ARM_NEON_IMPLEMENTATION which can 143 * be: 144 * 145 * 1 The intrinsics code (the default with __ARM_NEON__) 146 * 2 The hand coded assembler (the default without __ARM_NEON__) 147 * 148 * It is possible to set PNG_ARM_NEON_IMPLEMENTATION in CPPFLAGS, however 149 * this is *NOT* supported and may cease to work even after a minor revision 150 * to libpng. It *is* valid to do this for testing purposes, e.g. speed 151 * testing or a new compiler, but the results should be communicated to the 152 * libpng implementation list for incorporation in the next minor release. 153 */ 154# ifndef PNG_ARM_NEON_IMPLEMENTATION 155# if defined(__ARM_NEON__) || defined(__ARM_NEON) 156# if defined(__clang__) 157 /* At present it is unknown by the libpng developers which versions 158 * of clang support the intrinsics, however some or perhaps all 159 * versions do not work with the assembler so this may be 160 * irrelevant, so just use the default (do nothing here.) 161 */ 162# elif defined(__GNUC__) 163 /* GCC 4.5.4 NEON support is known to be broken. 4.6.3 is known to 164 * work, so if this *is* GCC, or G++, look for a version >4.5 165 */ 166# if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6) 167# define PNG_ARM_NEON_IMPLEMENTATION 2 168# endif /* no GNUC support */ 169# endif /* __GNUC__ */ 170# else /* !defined __ARM_NEON__ */ 171 /* The 'intrinsics' code simply won't compile without this -mfpu=neon: 172 */ 173# define PNG_ARM_NEON_IMPLEMENTATION 2 174# endif /* __ARM_NEON__ */ 175# endif /* !defined PNG_ARM_NEON_IMPLEMENTATION */ 176 177# ifndef PNG_ARM_NEON_IMPLEMENTATION 178 /* Use the intrinsics code by default. */ 179# define PNG_ARM_NEON_IMPLEMENTATION 1 180# endif 181#endif /* PNG_ARM_NEON_OPT > 0 */ 182 183/* Is this a build of a DLL where compilation of the object modules requires 184 * different preprocessor settings to those required for a simple library? If 185 * so PNG_BUILD_DLL must be set. 186 * 187 * If libpng is used inside a DLL but that DLL does not export the libpng APIs 188 * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a 189 * static library of libpng then link the DLL against that. 190 */ 191#ifndef PNG_BUILD_DLL 192# ifdef DLL_EXPORT 193 /* This is set by libtool when files are compiled for a DLL; libtool 194 * always compiles twice, even on systems where it isn't necessary. Set 195 * PNG_BUILD_DLL in case it is necessary: 196 */ 197# define PNG_BUILD_DLL 198# else 199# ifdef _WINDLL 200 /* This is set by the Microsoft Visual Studio IDE in projects that 201 * build a DLL. It can't easily be removed from those projects (it 202 * isn't visible in the Visual Studio UI) so it is a fairly reliable 203 * indication that PNG_IMPEXP needs to be set to the DLL export 204 * attributes. 205 */ 206# define PNG_BUILD_DLL 207# else 208# ifdef __DLL__ 209 /* This is set by the Borland C system when compiling for a DLL 210 * (as above.) 211 */ 212# define PNG_BUILD_DLL 213# else 214 /* Add additional compiler cases here. */ 215# endif 216# endif 217# endif 218#endif /* Setting PNG_BUILD_DLL if required */ 219 220/* See pngconf.h for more details: the builder of the library may set this on 221 * the command line to the right thing for the specific compilation system or it 222 * may be automagically set above (at present we know of no system where it does 223 * need to be set on the command line.) 224 * 225 * PNG_IMPEXP must be set here when building the library to prevent pngconf.h 226 * setting it to the "import" setting for a DLL build. 227 */ 228#ifndef PNG_IMPEXP 229# ifdef PNG_BUILD_DLL 230# define PNG_IMPEXP PNG_DLL_EXPORT 231# else 232 /* Not building a DLL, or the DLL doesn't require specific export 233 * definitions. 234 */ 235# define PNG_IMPEXP 236# endif 237#endif 238 239/* No warnings for private or deprecated functions in the build: */ 240#ifndef PNG_DEPRECATED 241# define PNG_DEPRECATED 242#endif 243#ifndef PNG_PRIVATE 244# define PNG_PRIVATE 245#endif 246 247/* Symbol preprocessing support. 248 * 249 * To enable listing global, but internal, symbols the following macros should 250 * always be used to declare an extern data or function object in this file. 251 */ 252#ifndef PNG_INTERNAL_DATA 253# define PNG_INTERNAL_DATA(type, name, array) extern type name array 254#endif 255 256#ifndef PNG_INTERNAL_FUNCTION 257# define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\ 258 extern PNG_FUNCTION(type, name, args, PNG_EMPTY attributes) 259#endif 260 261#ifndef PNG_INTERNAL_CALLBACK 262# define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\ 263 extern PNG_FUNCTION(type, (PNGCBAPI name), args, PNG_EMPTY attributes) 264#endif 265 266/* If floating or fixed point APIs are disabled they may still be compiled 267 * internally. To handle this make sure they are declared as the appropriate 268 * internal extern function (otherwise the symbol prefixing stuff won't work and 269 * the functions will be used without definitions.) 270 * 271 * NOTE: although all the API functions are declared here they are not all 272 * actually built! Because the declarations are still made it is necessary to 273 * fake out types that they depend on. 274 */ 275#ifndef PNG_FP_EXPORT 276# ifndef PNG_FLOATING_POINT_SUPPORTED 277# define PNG_FP_EXPORT(ordinal, type, name, args)\ 278 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 279# ifndef PNG_VERSION_INFO_ONLY 280 typedef struct png_incomplete png_double; 281 typedef png_double* png_doublep; 282 typedef const png_double* png_const_doublep; 283 typedef png_double** png_doublepp; 284# endif 285# endif 286#endif 287#ifndef PNG_FIXED_EXPORT 288# ifndef PNG_FIXED_POINT_SUPPORTED 289# define PNG_FIXED_EXPORT(ordinal, type, name, args)\ 290 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 291# endif 292#endif 293 294#include "png.h" 295 296/* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */ 297#ifndef PNG_DLL_EXPORT 298# define PNG_DLL_EXPORT 299#endif 300 301/* SECURITY and SAFETY: 302 * 303 * By default libpng is built without any internal limits on image size, 304 * individual heap (png_malloc) allocations or the total amount of memory used. 305 * If PNG_SAFE_LIMITS_SUPPORTED is defined, however, the limits below are used 306 * (unless individually overridden). These limits are believed to be fairly 307 * safe, but builders of secure systems should verify the values against the 308 * real system capabilities. 309 */ 310#ifdef PNG_SAFE_LIMITS_SUPPORTED 311 /* 'safe' limits */ 312# ifndef PNG_USER_WIDTH_MAX 313# define PNG_USER_WIDTH_MAX 1000000 314# endif 315# ifndef PNG_USER_HEIGHT_MAX 316# define PNG_USER_HEIGHT_MAX 1000000 317# endif 318# ifndef PNG_USER_CHUNK_CACHE_MAX 319# define PNG_USER_CHUNK_CACHE_MAX 128 320# endif 321# ifndef PNG_USER_CHUNK_MALLOC_MAX 322# define PNG_USER_CHUNK_MALLOC_MAX 8000000 323# endif 324#else 325 /* values for no limits */ 326# ifndef PNG_USER_WIDTH_MAX 327# define PNG_USER_WIDTH_MAX 0x7fffffff 328# endif 329# ifndef PNG_USER_HEIGHT_MAX 330# define PNG_USER_HEIGHT_MAX 0x7fffffff 331# endif 332# ifndef PNG_USER_CHUNK_CACHE_MAX 333# define PNG_USER_CHUNK_CACHE_MAX 0 334# endif 335# ifndef PNG_USER_CHUNK_MALLOC_MAX 336# define PNG_USER_CHUNK_MALLOC_MAX 0 337# endif 338#endif 339 340/* Moved to pngpriv.h at libpng-1.5.0 */ 341/* NOTE: some of these may have been used in external applications as 342 * these definitions were exposed in pngconf.h prior to 1.5. 343 */ 344 345/* If you are running on a machine where you cannot allocate more 346 * than 64K of memory at once, uncomment this. While libpng will not 347 * normally need that much memory in a chunk (unless you load up a very 348 * large file), zlib needs to know how big of a chunk it can use, and 349 * libpng thus makes sure to check any memory allocation to verify it 350 * will fit into memory. 351 * 352 * zlib provides 'MAXSEG_64K' which, if defined, indicates the 353 * same limit and pngconf.h (already included) sets the limit 354 * if certain operating systems are detected. 355 */ 356#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K) 357# define PNG_MAX_MALLOC_64K 358#endif 359 360#ifndef PNG_UNUSED 361/* Unused formal parameter warnings are silenced using the following macro 362 * which is expected to have no bad effects on performance (optimizing 363 * compilers will probably remove it entirely). Note that if you replace 364 * it with something other than whitespace, you must include the terminating 365 * semicolon. 366 */ 367# define PNG_UNUSED(param) (void)param; 368#endif 369 370/* Just a little check that someone hasn't tried to define something 371 * contradictory. 372 */ 373#if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K) 374# undef PNG_ZBUF_SIZE 375# define PNG_ZBUF_SIZE 65536L 376#endif 377 378/* If warnings or errors are turned off the code is disabled or redirected here. 379 * From 1.5.4 functions have been added to allow very limited formatting of 380 * error and warning messages - this code will also be disabled here. 381 */ 382#ifdef PNG_WARNINGS_SUPPORTED 383# define PNG_WARNING_PARAMETERS(p) png_warning_parameters p; 384#else 385# define png_warning_parameter(p,number,string) ((void)0) 386# define png_warning_parameter_unsigned(p,number,format,value) ((void)0) 387# define png_warning_parameter_signed(p,number,format,value) ((void)0) 388# define png_formatted_warning(pp,p,message) ((void)(pp)) 389# define PNG_WARNING_PARAMETERS(p) 390#endif 391#ifndef PNG_ERROR_TEXT_SUPPORTED 392# define png_fixed_error(s1,s2) png_err(s1) 393#endif 394 395/* C allows up-casts from (void*) to any pointer and (const void*) to any 396 * pointer to a const object. C++ regards this as a type error and requires an 397 * explicit, static, cast and provides the static_cast<> rune to ensure that 398 * const is not cast away. 399 */ 400#ifdef __cplusplus 401# define png_voidcast(type, value) static_cast<type>(value) 402# define png_constcast(type, value) const_cast<type>(value) 403# define png_aligncast(type, value) \ 404 static_cast<type>(static_cast<void*>(value)) 405# define png_aligncastconst(type, value) \ 406 static_cast<type>(static_cast<const void*>(value)) 407#else 408# define png_voidcast(type, value) (value) 409# define png_constcast(type, value) ((type)(value)) 410# define png_aligncast(type, value) ((void*)(value)) 411# define png_aligncastconst(type, value) ((const void*)(value)) 412#endif /* __cplusplus */ 413 414/* Some fixed point APIs are still required even if not exported because 415 * they get used by the corresponding floating point APIs. This magic 416 * deals with this: 417 */ 418#ifdef PNG_FIXED_POINT_SUPPORTED 419# define PNGFAPI PNGAPI 420#else 421# define PNGFAPI /* PRIVATE */ 422#endif 423 424#ifndef PNG_VERSION_INFO_ONLY 425/* Other defines specific to compilers can go here. Try to keep 426 * them inside an appropriate ifdef/endif pair for portability. 427 */ 428#if defined(PNG_FLOATING_POINT_SUPPORTED) ||\ 429 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) 430 /* png.c requires the following ANSI-C constants if the conversion of 431 * floating point to ASCII is implemented therein: 432 * 433 * DBL_DIG Maximum number of decimal digits (can be set to any constant) 434 * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value) 435 * DBL_MAX Maximum floating point number (can be set to an arbitrary value) 436 */ 437# include <float.h> 438 439# if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \ 440 defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC) 441 /* We need to check that <math.h> hasn't already been included earlier 442 * as it seems it doesn't agree with <fp.h>, yet we should really use 443 * <fp.h> if possible. 444 */ 445# if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__) 446# include <fp.h> 447# endif 448# else 449# include <math.h> 450# endif 451# if defined(_AMIGA) && defined(__SASC) && defined(_M68881) 452 /* Amiga SAS/C: We must include builtin FPU functions when compiling using 453 * MATH=68881 454 */ 455# include <m68881.h> 456# endif 457#endif 458 459/* This provides the non-ANSI (far) memory allocation routines. */ 460#if defined(__TURBOC__) && defined(__MSDOS__) 461# include <mem.h> 462# include <alloc.h> 463#endif 464 465#if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \ 466 defined(_WIN32) || defined(__WIN32__) 467# include <windows.h> /* defines _WINDOWS_ macro */ 468#endif 469#endif /* PNG_VERSION_INFO_ONLY */ 470 471/* Moved here around 1.5.0beta36 from pngconf.h */ 472/* Users may want to use these so they are not private. Any library 473 * functions that are passed far data must be model-independent. 474 */ 475 476/* Memory model/platform independent fns */ 477#ifndef PNG_ABORT 478# ifdef _WINDOWS_ 479# define PNG_ABORT() ExitProcess(0) 480# else 481# define PNG_ABORT() abort() 482# endif 483#endif 484 485/* These macros may need to be architecture dependent. */ 486#define PNG_ALIGN_NONE 0 /* do not use data alignment */ 487#define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */ 488#ifdef offsetof 489# define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */ 490#else 491# define PNG_ALIGN_OFFSET -1 /* prevent the use of this */ 492#endif 493#define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */ 494 495#ifndef PNG_ALIGN_TYPE 496 /* Default to using aligned access optimizations and requiring alignment to a 497 * multiple of the data type size. Override in a compiler specific fashion 498 * if necessary by inserting tests here: 499 */ 500# define PNG_ALIGN_TYPE PNG_ALIGN_SIZE 501#endif 502 503#if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE 504 /* This is used because in some compiler implementations non-aligned 505 * structure members are supported, so the offsetof approach below fails. 506 * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access 507 * is good for performance. Do not do this unless you have tested the result 508 * and understand it. 509 */ 510# define png_alignof(type) (sizeof (type)) 511#else 512# if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET 513# define png_alignof(type) offsetof(struct{char c; type t;}, t) 514# else 515# if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS 516# define png_alignof(type) (1) 517# endif 518 /* Else leave png_alignof undefined to prevent use thereof */ 519# endif 520#endif 521 522/* This implicitly assumes alignment is always to a power of 2. */ 523#ifdef png_alignof 524# define png_isaligned(ptr, type)\ 525 ((((const char*)ptr-(const char*)0) & (png_alignof(type)-1)) == 0) 526#else 527# define png_isaligned(ptr, type) 0 528#endif 529 530/* End of memory model/platform independent support */ 531/* End of 1.5.0beta36 move from pngconf.h */ 532 533/* CONSTANTS and UTILITY MACROS 534 * These are used internally by libpng and not exposed in the API 535 */ 536 537/* Various modes of operation. Note that after an init, mode is set to 538 * zero automatically when the structure is created. Three of these 539 * are defined in png.h because they need to be visible to applications 540 * that call png_set_unknown_chunk(). 541 */ 542/* #define PNG_HAVE_IHDR 0x01 (defined in png.h) */ 543/* #define PNG_HAVE_PLTE 0x02 (defined in png.h) */ 544#define PNG_HAVE_IDAT 0x04 545/* #define PNG_AFTER_IDAT 0x08 (defined in png.h) */ 546#define PNG_HAVE_IEND 0x10 547 /* 0x20 (unused) */ 548 /* 0x40 (unused) */ 549 /* 0x80 (unused) */ 550#define PNG_HAVE_CHUNK_HEADER 0x100 551#define PNG_WROTE_tIME 0x200 552#define PNG_WROTE_INFO_BEFORE_PLTE 0x400 553#define PNG_BACKGROUND_IS_GRAY 0x800 554#define PNG_HAVE_PNG_SIGNATURE 0x1000 555#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ 556 /* 0x4000 (unused) */ 557#define PNG_IS_READ_STRUCT 0x8000 /* Else is a write struct */ 558 559/* Flags for the transformations the PNG library does on the image data */ 560#define PNG_BGR 0x0001 561#define PNG_INTERLACE 0x0002 562#define PNG_PACK 0x0004 563#define PNG_SHIFT 0x0008 564#define PNG_SWAP_BYTES 0x0010 565#define PNG_INVERT_MONO 0x0020 566#define PNG_QUANTIZE 0x0040 567#define PNG_COMPOSE 0x0080 /* Was PNG_BACKGROUND */ 568#define PNG_BACKGROUND_EXPAND 0x0100 569#define PNG_EXPAND_16 0x0200 /* Added to libpng 1.5.2 */ 570#define PNG_16_TO_8 0x0400 /* Becomes 'chop' in 1.5.4 */ 571#define PNG_RGBA 0x0800 572#define PNG_EXPAND 0x1000 573#define PNG_GAMMA 0x2000 574#define PNG_GRAY_TO_RGB 0x4000 575#define PNG_FILLER 0x8000 576#define PNG_PACKSWAP 0x10000 577#define PNG_SWAP_ALPHA 0x20000 578#define PNG_STRIP_ALPHA 0x40000 579#define PNG_INVERT_ALPHA 0x80000 580#define PNG_USER_TRANSFORM 0x100000 581#define PNG_RGB_TO_GRAY_ERR 0x200000 582#define PNG_RGB_TO_GRAY_WARN 0x400000 583#define PNG_RGB_TO_GRAY 0x600000 /* two bits, RGB_TO_GRAY_ERR|WARN */ 584#define PNG_ENCODE_ALPHA 0x800000 /* Added to libpng-1.5.4 */ 585#define PNG_ADD_ALPHA 0x1000000 /* Added to libpng-1.2.7 */ 586#define PNG_EXPAND_tRNS 0x2000000 /* Added to libpng-1.2.9 */ 587#define PNG_SCALE_16_TO_8 0x4000000 /* Added to libpng-1.5.4 */ 588 /* 0x8000000 unused */ 589 /* 0x10000000 unused */ 590 /* 0x20000000 unused */ 591 /* 0x40000000 unused */ 592/* Flags for png_create_struct */ 593#define PNG_STRUCT_PNG 0x0001 594#define PNG_STRUCT_INFO 0x0002 595 596/* Scaling factor for filter heuristic weighting calculations */ 597#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) 598#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) 599 600/* Flags for the png_ptr->flags rather than declaring a byte for each one */ 601#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 602#define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002 /* Added to libpng-1.6.0 */ 603 /* 0x0004 unused */ 604#define PNG_FLAG_ZSTREAM_ENDED 0x0008 /* Added to libpng-1.6.0 */ 605 /* 0x0010 unused */ 606 /* 0x0020 unused */ 607#define PNG_FLAG_ROW_INIT 0x0040 608#define PNG_FLAG_FILLER_AFTER 0x0080 609#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 610#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 611#define PNG_FLAG_CRC_CRITICAL_USE 0x0400 612#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 613#define PNG_FLAG_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.4 */ 614#define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.4 */ 615#define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.4 */ 616/* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000 */ 617/* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000 */ 618#define PNG_FLAG_LIBRARY_MISMATCH 0x20000 619#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000 620#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000 621#define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000 /* Added to libpng-1.4.0 */ 622#define PNG_FLAG_APP_WARNINGS_WARN 0x200000 /* Added to libpng-1.6.0 */ 623#define PNG_FLAG_APP_ERRORS_WARN 0x400000 /* Added to libpng-1.6.0 */ 624 /* 0x800000 unused */ 625 /* 0x1000000 unused */ 626 /* 0x2000000 unused */ 627 /* 0x4000000 unused */ 628 /* 0x8000000 unused */ 629 /* 0x10000000 unused */ 630 /* 0x20000000 unused */ 631 /* 0x40000000 unused */ 632 633#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 634 PNG_FLAG_CRC_ANCILLARY_NOWARN) 635 636#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 637 PNG_FLAG_CRC_CRITICAL_IGNORE) 638 639#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 640 PNG_FLAG_CRC_CRITICAL_MASK) 641 642/* Save typing and make code easier to understand */ 643 644#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 645 abs((int)((c1).green) - (int)((c2).green)) + \ 646 abs((int)((c1).blue) - (int)((c2).blue))) 647 648/* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255 649 * by dividing by 257 *with rounding*. This macro is exact for the given range. 650 * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the 651 * macro were established by experiment (modifying the added value). The macro 652 * has a second variant that takes a value already scaled by 255 and divides by 653 * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it 654 * only gives off-by-one errors and only for 0.5% (1 in 200) of the values. 655 */ 656#define PNG_DIV65535(v24) (((v24) + 32895) >> 16) 657#define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255) 658 659/* Added to libpng-1.2.6 JB */ 660#define PNG_ROWBYTES(pixel_bits, width) \ 661 ((pixel_bits) >= 8 ? \ 662 ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \ 663 (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) ) 664 665/* PNG_OUT_OF_RANGE returns true if value is outside the range 666 * ideal-delta..ideal+delta. Each argument is evaluated twice. 667 * "ideal" and "delta" should be constants, normally simple 668 * integers, "value" a variable. Added to libpng-1.2.6 JB 669 */ 670#define PNG_OUT_OF_RANGE(value, ideal, delta) \ 671 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 672 673/* Conversions between fixed and floating point, only defined if 674 * required (to make sure the code doesn't accidentally use float 675 * when it is supposedly disabled.) 676 */ 677#ifdef PNG_FLOATING_POINT_SUPPORTED 678/* The floating point conversion can't overflow, though it can and 679 * does lose accuracy relative to the original fixed point value. 680 * In practice this doesn't matter because png_fixed_point only 681 * stores numbers with very low precision. The png_ptr and s 682 * arguments are unused by default but are there in case error 683 * checking becomes a requirement. 684 */ 685#define png_float(png_ptr, fixed, s) (.00001 * (fixed)) 686 687/* The fixed point conversion performs range checking and evaluates 688 * its argument multiple times, so must be used with care. The 689 * range checking uses the PNG specification values for a signed 690 * 32 bit fixed point value except that the values are deliberately 691 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly 692 * (2^31-1) * 100000). 's' is a string that describes the value being 693 * converted. 694 * 695 * NOTE: this macro will raise a png_error if the range check fails, 696 * therefore it is normally only appropriate to use this on values 697 * that come from API calls or other sources where an out of range 698 * error indicates a programming error, not a data error! 699 * 700 * NOTE: by default this is off - the macro is not used - because the 701 * function call saves a lot of code. 702 */ 703#ifdef PNG_FIXED_POINT_MACRO_SUPPORTED 704#define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\ 705 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0)) 706#endif 707/* else the corresponding function is defined below, inside the scope of the 708 * cplusplus test. 709 */ 710#endif 711 712/* Constants for known chunk types. If you need to add a chunk, define the name 713 * here. For historical reasons these constants have the form png_<name>; i.e. 714 * the prefix is lower case. Please use decimal values as the parameters to 715 * match the ISO PNG specification and to avoid relying on the C locale 716 * interpretation of character values. 717 * 718 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values 719 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string 720 * to be generated if required. 721 * 722 * PNG_32b correctly produces a value shifted by up to 24 bits, even on 723 * architectures where (int) is only 16 bits. 724 */ 725#define PNG_32b(b,s) ((png_uint_32)(b) << (s)) 726#define PNG_U32(b1,b2,b3,b4) \ 727 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0)) 728 729/* Constants for known chunk types. 730 * 731 * MAINTAINERS: If you need to add a chunk, define the name here. 732 * For historical reasons these constants have the form png_<name>; i.e. 733 * the prefix is lower case. Please use decimal values as the parameters to 734 * match the ISO PNG specification and to avoid relying on the C locale 735 * interpretation of character values. Please keep the list sorted. 736 * 737 * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk 738 * type. In fact the specification does not express chunk types this way, 739 * however using a 32-bit value means that the chunk type can be read from the 740 * stream using exactly the same code as used for a 32-bit unsigned value and 741 * can be examined far more efficiently (using one arithmetic compare). 742 * 743 * Prior to 1.5.6 the chunk type constants were expressed as C strings. The 744 * libpng API still uses strings for 'unknown' chunks and a macro, 745 * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice 746 * that for portable code numeric values must still be used; the string "IHDR" 747 * is not portable and neither is PNG_U32('I', 'H', 'D', 'R'). 748 * 749 * In 1.7.0 the definitions will be made public in png.h to avoid having to 750 * duplicate the same definitions in application code. 751 */ 752#define png_IDAT PNG_U32( 73, 68, 65, 84) 753#define png_IEND PNG_U32( 73, 69, 78, 68) 754#define png_IHDR PNG_U32( 73, 72, 68, 82) 755#define png_PLTE PNG_U32( 80, 76, 84, 69) 756#define png_bKGD PNG_U32( 98, 75, 71, 68) 757#define png_cHRM PNG_U32( 99, 72, 82, 77) 758#define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */ 759#define png_gAMA PNG_U32(103, 65, 77, 65) 760#define png_gIFg PNG_U32(103, 73, 70, 103) 761#define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */ 762#define png_gIFx PNG_U32(103, 73, 70, 120) 763#define png_hIST PNG_U32(104, 73, 83, 84) 764#define png_iCCP PNG_U32(105, 67, 67, 80) 765#define png_iTXt PNG_U32(105, 84, 88, 116) 766#define png_oFFs PNG_U32(111, 70, 70, 115) 767#define png_pCAL PNG_U32(112, 67, 65, 76) 768#define png_pHYs PNG_U32(112, 72, 89, 115) 769#define png_sBIT PNG_U32(115, 66, 73, 84) 770#define png_sCAL PNG_U32(115, 67, 65, 76) 771#define png_sPLT PNG_U32(115, 80, 76, 84) 772#define png_sRGB PNG_U32(115, 82, 71, 66) 773#define png_sTER PNG_U32(115, 84, 69, 82) 774#define png_tEXt PNG_U32(116, 69, 88, 116) 775#define png_tIME PNG_U32(116, 73, 77, 69) 776#define png_tRNS PNG_U32(116, 82, 78, 83) 777#define png_zTXt PNG_U32(122, 84, 88, 116) 778 779/* The following will work on (signed char*) strings, whereas the get_uint_32 780 * macro will fail on top-bit-set values because of the sign extension. 781 */ 782#define PNG_CHUNK_FROM_STRING(s)\ 783 PNG_U32(0xff&(s)[0], 0xff&(s)[1], 0xff&(s)[2], 0xff&(s)[3]) 784 785/* This uses (char), not (png_byte) to avoid warnings on systems where (char) is 786 * signed and the argument is a (char[]) This macro will fail miserably on 787 * systems where (char) is more than 8 bits. 788 */ 789#define PNG_STRING_FROM_CHUNK(s,c)\ 790 (void)(((char*)(s))[0]=(char)((c)>>24), ((char*)(s))[1]=(char)((c)>>16),\ 791 ((char*)(s))[2]=(char)((c)>>8), ((char*)(s))[3]=(char)((c))) 792 793/* Do the same but terminate with a null character. */ 794#define PNG_CSTRING_FROM_CHUNK(s,c)\ 795 (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0) 796 797/* Test on flag values as defined in the spec (section 5.4): */ 798#define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29)) 799#define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c)) 800#define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21)) 801#define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13)) 802#define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5)) 803 804/* Gamma values (new at libpng-1.5.4): */ 805#define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */ 806#define PNG_GAMMA_MAC_INVERSE 65909 807#define PNG_GAMMA_sRGB_INVERSE 45455 808 809/* Almost everything below is C specific; the #defines above can be used in 810 * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot. 811 */ 812#ifndef PNG_VERSION_INFO_ONLY 813 814#include "pngstruct.h" 815#include "pnginfo.h" 816 817/* Validate the include paths - the include path used to generate pnglibconf.h 818 * must match that used in the build, or we must be using pnglibconf.h.prebuilt: 819 */ 820#if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM 821# error ZLIB_VERNUM != PNG_ZLIB_VERNUM \ 822 "-I (include path) error: see the notes in pngpriv.h" 823 /* This means that when pnglibconf.h was built the copy of zlib.h that it 824 * used is not the same as the one being used here. Because the build of 825 * libpng makes decisions to use inflateInit2 and inflateReset2 based on the 826 * zlib version number and because this affects handling of certain broken 827 * PNG files the -I directives must match. 828 * 829 * The most likely explanation is that you passed a -I in CFLAGS, this will 830 * not work; all the preprocessor directories and in particular all the -I 831 * directives must be in CPPFLAGS. 832 */ 833#endif 834 835/* This is used for 16 bit gamma tables -- only the top level pointers are 836 * const; this could be changed: 837 */ 838typedef const png_uint_16p * png_const_uint_16pp; 839 840/* Added to libpng-1.5.7: sRGB conversion tables */ 841#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 842 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 843#ifdef PNG_SIMPLIFIED_READ_SUPPORTED 844PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]); 845 /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value, 846 * 0..65535. This table gives the closest 16-bit answers (no errors). 847 */ 848#endif 849 850PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]); 851PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]); 852 853#define PNG_sRGB_FROM_LINEAR(linear) ((png_byte)((png_sRGB_base[(linear)>>15] +\ 854 ((((linear)&0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8)) 855 /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB 856 * encoded value with maximum error 0.646365. Note that the input is not a 857 * 16-bit value; it has been multiplied by 255! */ 858#endif /* PNG_SIMPLIFIED_READ/WRITE */ 859 860 861/* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 862#ifdef __cplusplus 863extern "C" { 864#endif /* __cplusplus */ 865 866/* Internal functions; these are not exported from a DLL however because they 867 * are used within several of the C source files they have to be C extern. 868 * 869 * All of these functions must be declared with PNG_INTERNAL_FUNCTION. 870 */ 871 872/* Zlib support */ 873#define PNG_UNEXPECTED_ZLIB_RETURN (-7) 874PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret), 875 PNG_EMPTY); 876 /* Used by the zlib handling functions to ensure that z_stream::msg is always 877 * set before they return. 878 */ 879 880#ifdef PNG_WRITE_SUPPORTED 881PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr, 882 png_compression_bufferp *list),PNG_EMPTY); 883 /* Free the buffer list used by the compressed write code. */ 884#endif 885 886#if defined(PNG_FLOATING_POINT_SUPPORTED) && \ 887 !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \ 888 (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \ 889 defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \ 890 defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \ 891 (defined(PNG_sCAL_SUPPORTED) && \ 892 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)) 893PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr, 894 double fp, png_const_charp text),PNG_EMPTY); 895#endif 896 897/* Check the user version string for compatibility, returns false if the version 898 * numbers aren't compatible. 899 */ 900PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr, 901 png_const_charp user_png_ver),PNG_EMPTY); 902 903/* Internal base allocator - no messages, NULL on failure to allocate. This 904 * does, however, call the application provided allocator and that could call 905 * png_error (although that would be a bug in the application implementation.) 906 */ 907PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr, 908 png_alloc_size_t size),PNG_ALLOCATED); 909 910#if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\ 911 defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED) 912/* Internal array allocator, outputs no error or warning messages on failure, 913 * just returns NULL. 914 */ 915PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr, 916 int nelements, size_t element_size),PNG_ALLOCATED); 917 918/* The same but an existing array is extended by add_elements. This function 919 * also memsets the new elements to 0 and copies the old elements. The old 920 * array is not freed or altered. 921 */ 922PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr, 923 png_const_voidp array, int old_elements, int add_elements, 924 size_t element_size),PNG_ALLOCATED); 925#endif /* text, sPLT or unknown chunks */ 926 927/* Magic to create a struct when there is no struct to call the user supplied 928 * memory allocators. Because error handling has not been set up the memory 929 * handlers can't safely call png_error, but this is an obscure and undocumented 930 * restriction so libpng has to assume that the 'free' handler, at least, might 931 * call png_error. 932 */ 933PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct, 934 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, 935 png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, 936 png_free_ptr free_fn),PNG_ALLOCATED); 937 938/* Free memory from internal libpng struct */ 939PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr), 940 PNG_EMPTY); 941 942/* Free an allocated jmp_buf (always succeeds) */ 943PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY); 944 945/* Function to allocate memory for zlib. PNGAPI is disallowed. */ 946PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size), 947 PNG_ALLOCATED); 948 949/* Function to free memory for zlib. PNGAPI is disallowed. */ 950PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY); 951 952/* Next four functions are used internally as callbacks. PNGCBAPI is required 953 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to 954 * PNGCBAPI at 1.5.0 955 */ 956 957PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr, 958 png_bytep data, png_size_t length),PNG_EMPTY); 959 960#ifdef PNG_PROGRESSIVE_READ_SUPPORTED 961PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr, 962 png_bytep buffer, png_size_t length),PNG_EMPTY); 963#endif 964 965PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr, 966 png_bytep data, png_size_t length),PNG_EMPTY); 967 968#ifdef PNG_WRITE_FLUSH_SUPPORTED 969# ifdef PNG_STDIO_SUPPORTED 970PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr), 971 PNG_EMPTY); 972# endif 973#endif 974 975/* Reset the CRC variable */ 976PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY); 977 978/* Write the "data" buffer to whatever output you are using */ 979PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr, 980 png_const_bytep data, png_size_t length),PNG_EMPTY); 981 982/* Read and check the PNG file signature */ 983PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr, 984 png_inforp info_ptr),PNG_EMPTY); 985 986/* Read the chunk header (length + type name) */ 987PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr), 988 PNG_EMPTY); 989 990/* Read data from whatever input you are using into the "data" buffer */ 991PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data, 992 png_size_t length),PNG_EMPTY); 993 994/* Read bytes into buf, and update png_ptr->crc */ 995PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf, 996 png_uint_32 length),PNG_EMPTY); 997 998/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 999PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr, 1000 png_uint_32 skip),PNG_EMPTY); 1001 1002/* Read the CRC from the file and compare it to the libpng calculated CRC */ 1003PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY); 1004 1005/* Calculate the CRC over a section of data. Note that we are only 1006 * passing a maximum of 64K on systems that have this as a memory limit, 1007 * since this is the maximum buffer size we can specify. 1008 */ 1009PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr, 1010 png_const_bytep ptr, png_size_t length),PNG_EMPTY); 1011 1012#ifdef PNG_WRITE_FLUSH_SUPPORTED 1013PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY); 1014#endif 1015 1016/* Write various chunks */ 1017 1018/* Write the IHDR chunk, and update the png_struct with the necessary 1019 * information. 1020 */ 1021PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr, 1022 png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, 1023 int compression_method, int filter_method, int interlace_method),PNG_EMPTY); 1024 1025PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr, 1026 png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY); 1027 1028PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr, 1029 png_const_bytep row_data, png_alloc_size_t row_data_length, int flush), 1030 PNG_EMPTY); 1031 1032PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY); 1033 1034#ifdef PNG_WRITE_gAMA_SUPPORTED 1035PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr, 1036 png_fixed_point file_gamma),PNG_EMPTY); 1037#endif 1038 1039#ifdef PNG_WRITE_sBIT_SUPPORTED 1040PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr, 1041 png_const_color_8p sbit, int color_type),PNG_EMPTY); 1042#endif 1043 1044#ifdef PNG_WRITE_cHRM_SUPPORTED 1045PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr, 1046 const png_xy *xy), PNG_EMPTY); 1047 /* The xy value must have been previously validated */ 1048#endif 1049 1050#ifdef PNG_WRITE_sRGB_SUPPORTED 1051PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr, 1052 int intent),PNG_EMPTY); 1053#endif 1054 1055#ifdef PNG_WRITE_iCCP_SUPPORTED 1056PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr, 1057 png_const_charp name, png_const_bytep profile), PNG_EMPTY); 1058 /* The profile must have been previously validated for correctness, the 1059 * length comes from the first four bytes. Only the base, deflate, 1060 * compression is supported. 1061 */ 1062#endif 1063 1064#ifdef PNG_WRITE_sPLT_SUPPORTED 1065PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr, 1066 png_const_sPLT_tp palette),PNG_EMPTY); 1067#endif 1068 1069#ifdef PNG_WRITE_tRNS_SUPPORTED 1070PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr, 1071 png_const_bytep trans, png_const_color_16p values, int number, 1072 int color_type),PNG_EMPTY); 1073#endif 1074 1075#ifdef PNG_WRITE_bKGD_SUPPORTED 1076PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr, 1077 png_const_color_16p values, int color_type),PNG_EMPTY); 1078#endif 1079 1080#ifdef PNG_WRITE_hIST_SUPPORTED 1081PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr, 1082 png_const_uint_16p hist, int num_hist),PNG_EMPTY); 1083#endif 1084 1085/* Chunks that have keywords */ 1086#ifdef PNG_WRITE_tEXt_SUPPORTED 1087PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr, 1088 png_const_charp key, png_const_charp text, png_size_t text_len),PNG_EMPTY); 1089#endif 1090 1091#ifdef PNG_WRITE_zTXt_SUPPORTED 1092PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp 1093 key, png_const_charp text, png_size_t text_len, int compression),PNG_EMPTY); 1094#endif 1095 1096#ifdef PNG_WRITE_iTXt_SUPPORTED 1097PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr, 1098 int compression, png_const_charp key, png_const_charp lang, 1099 png_const_charp lang_key, png_const_charp text),PNG_EMPTY); 1100#endif 1101 1102#ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ 1103PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr, 1104 png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY); 1105#endif 1106 1107#ifdef PNG_WRITE_oFFs_SUPPORTED 1108PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr, 1109 png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY); 1110#endif 1111 1112#ifdef PNG_WRITE_pCAL_SUPPORTED 1113PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr, 1114 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, 1115 png_const_charp units, png_charpp params),PNG_EMPTY); 1116#endif 1117 1118#ifdef PNG_WRITE_pHYs_SUPPORTED 1119PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr, 1120 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 1121 int unit_type),PNG_EMPTY); 1122#endif 1123 1124#ifdef PNG_WRITE_tIME_SUPPORTED 1125PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr, 1126 png_const_timep mod_time),PNG_EMPTY); 1127#endif 1128 1129#ifdef PNG_WRITE_sCAL_SUPPORTED 1130PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr, 1131 int unit, png_const_charp width, png_const_charp height),PNG_EMPTY); 1132#endif 1133 1134/* Called when finished processing a row of data */ 1135PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr), 1136 PNG_EMPTY); 1137 1138/* Internal use only. Called before first row of data */ 1139PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr), 1140 PNG_EMPTY); 1141 1142/* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an 1143 * array of png_ptr->width pixels. If the image is not interlaced or this 1144 * is the final pass this just does a memcpy, otherwise the "display" flag 1145 * is used to determine whether to copy pixels that are not in the current pass. 1146 * 1147 * Because 'png_do_read_interlace' (below) replicates pixels this allows this 1148 * function to achieve the documented 'blocky' appearance during interlaced read 1149 * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row' 1150 * are not changed if they are not in the current pass, when display is 0. 1151 * 1152 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless. 1153 * 1154 * The API always reads from the png_struct row buffer and always assumes that 1155 * it is full width (png_do_read_interlace has already been called.) 1156 * 1157 * This function is only ever used to write to row buffers provided by the 1158 * caller of the relevant libpng API and the row must have already been 1159 * transformed by the read transformations. 1160 * 1161 * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed 1162 * bitmasks for use within the code, otherwise runtime generated masks are used. 1163 * The default is compile time masks. 1164 */ 1165#ifndef PNG_USE_COMPILE_TIME_MASKS 1166# define PNG_USE_COMPILE_TIME_MASKS 1 1167#endif 1168PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr, 1169 png_bytep row, int display),PNG_EMPTY); 1170 1171#ifdef PNG_READ_INTERLACING_SUPPORTED 1172/* Expand an interlaced row: the 'row_info' describes the pass data that has 1173 * been read in and must correspond to the pixels in 'row', the pixels are 1174 * expanded (moved apart) in 'row' to match the final layout, when doing this 1175 * the pixels are *replicated* to the intervening space. This is essential for 1176 * the correct operation of png_combine_row, above. 1177 */ 1178PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info, 1179 png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY); 1180#endif 1181 1182/* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 1183 1184#ifdef PNG_WRITE_INTERLACING_SUPPORTED 1185/* Grab pixels out of a row for an interlaced pass */ 1186PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info, 1187 png_bytep row, int pass),PNG_EMPTY); 1188#endif 1189 1190/* Unfilter a row: check the filter value before calling this, there is no point 1191 * calling it for PNG_FILTER_VALUE_NONE. 1192 */ 1193PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop 1194 row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY); 1195 1196PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info, 1197 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1198PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop 1199 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1200PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop 1201 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1202PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop 1203 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1204PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop 1205 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1206PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop 1207 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1208PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop 1209 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1210 1211/* Choose the best filter to use and filter the row data */ 1212PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr, 1213 png_row_infop row_info),PNG_EMPTY); 1214 1215#ifdef PNG_SEQUENTIAL_READ_SUPPORTED 1216PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr, 1217 png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY); 1218 /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer 1219 * is NULL the function checks, instead, for the end of the stream. In this 1220 * case a benign error will be issued if the stream end is not found or if 1221 * extra data has to be consumed. 1222 */ 1223PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr), 1224 PNG_EMPTY); 1225 /* This cleans up when the IDAT LZ stream does not end when the last image 1226 * byte is read; there is still some pending input. 1227 */ 1228 1229PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr), 1230 PNG_EMPTY); 1231 /* Finish a row while reading, dealing with interlacing passes, etc. */ 1232#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ 1233 1234/* Initialize the row buffers, etc. */ 1235PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY); 1236 1237#ifdef PNG_READ_TRANSFORMS_SUPPORTED 1238/* Optional call to update the users info structure */ 1239PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr, 1240 png_inforp info_ptr),PNG_EMPTY); 1241#endif 1242 1243/* Shared transform functions, defined in pngtran.c */ 1244#if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 1245 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 1246PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info, 1247 png_bytep row, int at_start),PNG_EMPTY); 1248#endif 1249 1250#ifdef PNG_16BIT_SUPPORTED 1251#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 1252PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info, 1253 png_bytep row),PNG_EMPTY); 1254#endif 1255#endif 1256 1257#if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ 1258 defined(PNG_WRITE_PACKSWAP_SUPPORTED) 1259PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info, 1260 png_bytep row),PNG_EMPTY); 1261#endif 1262 1263#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 1264PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info, 1265 png_bytep row),PNG_EMPTY); 1266#endif 1267 1268#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1269PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info, 1270 png_bytep row),PNG_EMPTY); 1271#endif 1272 1273/* The following decodes the appropriate chunks, and does error correction, 1274 * then calls the appropriate callback for the chunk if it is valid. 1275 */ 1276 1277/* Decode the IHDR chunk */ 1278PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr, 1279 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1280PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr, 1281 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1282PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr, 1283 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1284 1285#ifdef PNG_READ_bKGD_SUPPORTED 1286PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr, 1287 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1288#endif 1289 1290#ifdef PNG_READ_cHRM_SUPPORTED 1291PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr, 1292 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1293#endif 1294 1295#ifdef PNG_READ_gAMA_SUPPORTED 1296PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr, 1297 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1298#endif 1299 1300#ifdef PNG_READ_hIST_SUPPORTED 1301PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr, 1302 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1303#endif 1304 1305#ifdef PNG_READ_iCCP_SUPPORTED 1306PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr, 1307 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1308#endif /* PNG_READ_iCCP_SUPPORTED */ 1309 1310#ifdef PNG_READ_iTXt_SUPPORTED 1311PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr, 1312 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1313#endif 1314 1315#ifdef PNG_READ_oFFs_SUPPORTED 1316PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr, 1317 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1318#endif 1319 1320#ifdef PNG_READ_pCAL_SUPPORTED 1321PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr, 1322 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1323#endif 1324 1325#ifdef PNG_READ_pHYs_SUPPORTED 1326PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr, 1327 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1328#endif 1329 1330#ifdef PNG_READ_sBIT_SUPPORTED 1331PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr, 1332 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1333#endif 1334 1335#ifdef PNG_READ_sCAL_SUPPORTED 1336PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr, 1337 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1338#endif 1339 1340#ifdef PNG_READ_sPLT_SUPPORTED 1341PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr, 1342 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1343#endif /* PNG_READ_sPLT_SUPPORTED */ 1344 1345#ifdef PNG_READ_sRGB_SUPPORTED 1346PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr, 1347 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1348#endif 1349 1350#ifdef PNG_READ_tEXt_SUPPORTED 1351PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr, 1352 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1353#endif 1354 1355#ifdef PNG_READ_tIME_SUPPORTED 1356PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr, 1357 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1358#endif 1359 1360#ifdef PNG_READ_tRNS_SUPPORTED 1361PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr, 1362 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1363#endif 1364 1365#ifdef PNG_READ_zTXt_SUPPORTED 1366PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr, 1367 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1368#endif 1369 1370PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_structrp png_ptr, 1371 png_uint_32 chunk_name),PNG_EMPTY); 1372 1373PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr, 1374 png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY); 1375 /* This is the function that gets called for unknown chunks. The 'keep' 1376 * argument is either non-zero for a known chunk that has been set to be 1377 * handled as unknown or zero for an unknown chunk. By default the function 1378 * just skips the chunk or errors out if it is critical. 1379 */ 1380 1381#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\ 1382 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 1383PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling, 1384 (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY); 1385 /* Exactly as the API png_handle_as_unknown() except that the argument is a 1386 * 32-bit chunk name, not a string. 1387 */ 1388#endif /* READ_UNKNOWN_CHUNKS || HANDLE_AS_UNKNOWN */ 1389 1390/* Handle the transformations for reading and writing */ 1391#ifdef PNG_READ_TRANSFORMS_SUPPORTED 1392PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr, 1393 png_row_infop row_info),PNG_EMPTY); 1394#endif 1395#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED 1396PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr, 1397 png_row_infop row_info),PNG_EMPTY); 1398#endif 1399 1400#ifdef PNG_READ_TRANSFORMS_SUPPORTED 1401PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr), 1402 PNG_EMPTY); 1403#endif 1404 1405#ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1406PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr, 1407 png_inforp info_ptr),PNG_EMPTY); 1408PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr, 1409 png_inforp info_ptr),PNG_EMPTY); 1410PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY); 1411PNG_INTERNAL_FUNCTION(void,png_push_crc_skip,(png_structrp png_ptr, 1412 png_uint_32 length),PNG_EMPTY); 1413PNG_INTERNAL_FUNCTION(void,png_push_crc_finish,(png_structrp png_ptr), 1414 PNG_EMPTY); 1415PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr), 1416 PNG_EMPTY); 1417PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr, 1418 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); 1419PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY); 1420PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr, 1421 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); 1422PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr), 1423 PNG_EMPTY); 1424PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr, 1425 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1426PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr, 1427 png_inforp info_ptr),PNG_EMPTY); 1428PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr, 1429 png_inforp info_ptr),PNG_EMPTY); 1430PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr, 1431 png_bytep row),PNG_EMPTY); 1432PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr, 1433 png_inforp info_ptr),PNG_EMPTY); 1434PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr, 1435 png_inforp info_ptr),PNG_EMPTY); 1436PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr), 1437 PNG_EMPTY); 1438# ifdef PNG_READ_tEXt_SUPPORTED 1439PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr, 1440 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1441PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr, 1442 png_inforp info_ptr),PNG_EMPTY); 1443# endif 1444# ifdef PNG_READ_zTXt_SUPPORTED 1445PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr, 1446 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1447PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr, 1448 png_inforp info_ptr),PNG_EMPTY); 1449# endif 1450# ifdef PNG_READ_iTXt_SUPPORTED 1451PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr, 1452 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1453PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr, 1454 png_inforp info_ptr),PNG_EMPTY); 1455# endif 1456 1457#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 1458 1459/* Added at libpng version 1.6.0 */ 1460#ifdef PNG_GAMMA_SUPPORTED 1461PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr, 1462 png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY); 1463 /* Set the colorspace gamma with a value provided by the application or by 1464 * the gAMA chunk on read. The value will override anything set by an ICC 1465 * profile. 1466 */ 1467 1468PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr, 1469 png_inforp info_ptr), PNG_EMPTY); 1470 /* Synchronize the info 'valid' flags with the colorspace */ 1471 1472PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr, 1473 png_inforp info_ptr), PNG_EMPTY); 1474 /* Copy the png_struct colorspace to the info_struct and call the above to 1475 * synchronize the flags. Checks for NULL info_ptr and does nothing. 1476 */ 1477#endif 1478 1479/* Added at libpng version 1.4.0 */ 1480#ifdef PNG_COLORSPACE_SUPPORTED 1481/* These internal functions are for maintaining the colorspace structure within 1482 * a png_info or png_struct (or, indeed, both). 1483 */ 1484PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities, 1485 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy, 1486 int preferred), PNG_EMPTY); 1487 1488PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints, 1489 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ, 1490 int preferred), PNG_EMPTY); 1491 1492#ifdef PNG_sRGB_SUPPORTED 1493PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr, 1494 png_colorspacerp colorspace, int intent), PNG_EMPTY); 1495 /* This does set the colorspace gAMA and cHRM values too, but doesn't set the 1496 * flags to write them, if it returns false there was a problem and an error 1497 * message has already been output (but the colorspace may still need to be 1498 * synced to record the invalid flag). 1499 */ 1500#endif /* sRGB */ 1501 1502#ifdef PNG_iCCP_SUPPORTED 1503PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr, 1504 png_colorspacerp colorspace, png_const_charp name, 1505 png_uint_32 profile_length, png_const_bytep profile, int color_type), 1506 PNG_EMPTY); 1507 /* The 'name' is used for information only */ 1508 1509/* Routines for checking parts of an ICC profile. */ 1510PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr, 1511 png_colorspacerp colorspace, png_const_charp name, 1512 png_uint_32 profile_length), PNG_EMPTY); 1513PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr, 1514 png_colorspacerp colorspace, png_const_charp name, 1515 png_uint_32 profile_length, 1516 png_const_bytep profile /* first 132 bytes only */, int color_type), 1517 PNG_EMPTY); 1518PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr, 1519 png_colorspacerp colorspace, png_const_charp name, 1520 png_uint_32 profile_length, 1521 png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY); 1522#ifdef PNG_sRGB_SUPPORTED 1523PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,( 1524 png_const_structrp png_ptr, png_colorspacerp colorspace, 1525 png_const_bytep profile, uLong adler), PNG_EMPTY); 1526 /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may 1527 * be zero to indicate that it is not available. It is used, if provided, 1528 * as a fast check on the profile when checking to see if it is sRGB. 1529 */ 1530#endif 1531#endif /* iCCP */ 1532 1533#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1534PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients, 1535 (png_structrp png_ptr), PNG_EMPTY); 1536 /* Set the rgb_to_gray coefficients from the colorspace Y values */ 1537#endif /* READ_RGB_TO_GRAY */ 1538#endif /* COLORSPACE */ 1539 1540/* Added at libpng version 1.4.0 */ 1541PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr, 1542 png_uint_32 width, png_uint_32 height, int bit_depth, 1543 int color_type, int interlace_type, int compression_type, 1544 int filter_type),PNG_EMPTY); 1545 1546/* Added at libpng version 1.5.10 */ 1547#if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \ 1548 defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED) 1549PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes, 1550 (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY); 1551#endif 1552 1553#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) 1554PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr, 1555 png_const_charp name),PNG_NORETURN); 1556#endif 1557 1558/* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite 1559 * the end. Always leaves the buffer nul terminated. Never errors out (and 1560 * there is no error code.) 1561 */ 1562PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize, 1563 size_t pos, png_const_charp string),PNG_EMPTY); 1564 1565/* Various internal functions to handle formatted warning messages, currently 1566 * only implemented for warnings. 1567 */ 1568#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) 1569/* Utility to dump an unsigned value into a buffer, given a start pointer and 1570 * and end pointer (which should point just *beyond* the end of the buffer!) 1571 * Returns the pointer to the start of the formatted string. This utility only 1572 * does unsigned values. 1573 */ 1574PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start, 1575 png_charp end, int format, png_alloc_size_t number),PNG_EMPTY); 1576 1577/* Convenience macro that takes an array: */ 1578#define PNG_FORMAT_NUMBER(buffer,format,number) \ 1579 png_format_number(buffer, buffer + (sizeof buffer), format, number) 1580 1581/* Suggested size for a number buffer (enough for 64 bits and a sign!) */ 1582#define PNG_NUMBER_BUFFER_SIZE 24 1583 1584/* These are the integer formats currently supported, the name is formed from 1585 * the standard printf(3) format string. 1586 */ 1587#define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */ 1588#define PNG_NUMBER_FORMAT_02u 2 1589#define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */ 1590#define PNG_NUMBER_FORMAT_02d 2 1591#define PNG_NUMBER_FORMAT_x 3 1592#define PNG_NUMBER_FORMAT_02x 4 1593#define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */ 1594#endif 1595 1596#ifdef PNG_WARNINGS_SUPPORTED 1597/* New defines and members adding in libpng-1.5.4 */ 1598# define PNG_WARNING_PARAMETER_SIZE 32 1599# define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */ 1600 1601/* An l-value of this type has to be passed to the APIs below to cache the 1602 * values of the parameters to a formatted warning message. 1603 */ 1604typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][ 1605 PNG_WARNING_PARAMETER_SIZE]; 1606 1607PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p, 1608 int number, png_const_charp string),PNG_EMPTY); 1609 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters, 1610 * including the trailing '\0'. 1611 */ 1612PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned, 1613 (png_warning_parameters p, int number, int format, png_alloc_size_t value), 1614 PNG_EMPTY); 1615 /* Use png_alloc_size_t because it is an unsigned type as big as any we 1616 * need to output. Use the following for a signed value. 1617 */ 1618PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed, 1619 (png_warning_parameters p, int number, int format, png_int_32 value), 1620 PNG_EMPTY); 1621 1622PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr, 1623 png_warning_parameters p, png_const_charp message),PNG_EMPTY); 1624 /* 'message' follows the X/Open approach of using @1, @2 to insert 1625 * parameters previously supplied using the above functions. Errors in 1626 * specifying the parameters will simply result in garbage substitutions. 1627 */ 1628#endif 1629 1630#ifdef PNG_BENIGN_ERRORS_SUPPORTED 1631/* Application errors (new in 1.6); use these functions (declared below) for 1632 * errors in the parameters or order of API function calls on read. The 1633 * 'warning' should be used for an error that can be handled completely; the 1634 * 'error' for one which can be handled safely but which may lose application 1635 * information or settings. 1636 * 1637 * By default these both result in a png_error call prior to release, while in a 1638 * released version the 'warning' is just a warning. However if the application 1639 * explicitly disables benign errors (explicitly permitting the code to lose 1640 * information) they both turn into warnings. 1641 * 1642 * If benign errors aren't supported they end up as the corresponding base call 1643 * (png_warning or png_error.) 1644 */ 1645PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr, 1646 png_const_charp message),PNG_EMPTY); 1647 /* The application provided invalid parameters to an API function or called 1648 * an API function at the wrong time, libpng can completely recover. 1649 */ 1650 1651PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr, 1652 png_const_charp message),PNG_EMPTY); 1653 /* As above but libpng will ignore the call, or attempt some other partial 1654 * recovery from the error. 1655 */ 1656#else 1657# define png_app_warning(pp,s) png_warning(pp,s) 1658# define png_app_error(pp,s) png_error(pp,s) 1659#endif 1660 1661PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr, 1662 png_const_charp message, int error),PNG_EMPTY); 1663 /* Report a recoverable issue in chunk data. On read this is used to report 1664 * a problem found while reading a particular chunk and the 1665 * png_chunk_benign_error or png_chunk_warning function is used as 1666 * appropriate. On write this is used to report an error that comes from 1667 * data set via an application call to a png_set_ API and png_app_error or 1668 * png_app_warning is used as appropriate. 1669 * 1670 * The 'error' parameter must have one of the following values: 1671 */ 1672#define PNG_CHUNK_WARNING 0 /* never an error */ 1673#define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */ 1674#define PNG_CHUNK_ERROR 2 /* always an error */ 1675 1676/* ASCII to FP interfaces, currently only implemented if sCAL 1677 * support is required. 1678 */ 1679#if defined(PNG_sCAL_SUPPORTED) 1680/* MAX_DIGITS is actually the maximum number of characters in an sCAL 1681 * width or height, derived from the precision (number of significant 1682 * digits - a build time settable option) and assumptions about the 1683 * maximum ridiculous exponent. 1684 */ 1685#define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/) 1686 1687#ifdef PNG_FLOATING_POINT_SUPPORTED 1688PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr, 1689 png_charp ascii, png_size_t size, double fp, unsigned int precision), 1690 PNG_EMPTY); 1691#endif /* FLOATING_POINT */ 1692 1693#ifdef PNG_FIXED_POINT_SUPPORTED 1694PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr, 1695 png_charp ascii, png_size_t size, png_fixed_point fp),PNG_EMPTY); 1696#endif /* FIXED_POINT */ 1697#endif /* sCAL */ 1698 1699#if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) 1700/* An internal API to validate the format of a floating point number. 1701 * The result is the index of the next character. If the number is 1702 * not valid it will be the index of a character in the supposed number. 1703 * 1704 * The format of a number is defined in the PNG extensions specification 1705 * and this API is strictly conformant to that spec, not anyone elses! 1706 * 1707 * The format as a regular expression is: 1708 * 1709 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)? 1710 * 1711 * or: 1712 * 1713 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)? 1714 * 1715 * The complexity is that either integer or fraction must be present and the 1716 * fraction is permitted to have no digits only if the integer is present. 1717 * 1718 * NOTE: The dangling E problem. 1719 * There is a PNG valid floating point number in the following: 1720 * 1721 * PNG floating point numbers are not greedy. 1722 * 1723 * Working this out requires *TWO* character lookahead (because of the 1724 * sign), the parser does not do this - it will fail at the 'r' - this 1725 * doesn't matter for PNG sCAL chunk values, but it requires more care 1726 * if the value were ever to be embedded in something more complex. Use 1727 * ANSI-C strtod if you need the lookahead. 1728 */ 1729/* State table for the parser. */ 1730#define PNG_FP_INTEGER 0 /* before or in integer */ 1731#define PNG_FP_FRACTION 1 /* before or in fraction */ 1732#define PNG_FP_EXPONENT 2 /* before or in exponent */ 1733#define PNG_FP_STATE 3 /* mask for the above */ 1734#define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */ 1735#define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */ 1736#define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */ 1737#define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */ 1738#define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */ 1739 1740/* These three values don't affect the parser. They are set but not used. 1741 */ 1742#define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */ 1743#define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */ 1744#define PNG_FP_NONZERO 256 /* A non-zero value */ 1745#define PNG_FP_STICKY 448 /* The above three flags */ 1746 1747/* This is available for the caller to store in 'state' if required. Do not 1748 * call the parser after setting it (the parser sometimes clears it.) 1749 */ 1750#define PNG_FP_INVALID 512 /* Available for callers as a distinct value */ 1751 1752/* Result codes for the parser (boolean - true meants ok, false means 1753 * not ok yet.) 1754 */ 1755#define PNG_FP_MAYBE 0 /* The number may be valid in the future */ 1756#define PNG_FP_OK 1 /* The number is valid */ 1757 1758/* Tests on the sticky non-zero and negative flags. To pass these checks 1759 * the state must also indicate that the whole number is valid - this is 1760 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this 1761 * is equivalent to PNG_FP_OK above.) 1762 */ 1763#define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO) 1764 /* NZ_MASK: the string is valid and a non-zero negative value */ 1765#define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO) 1766 /* Z MASK: the string is valid and a non-zero value. */ 1767 /* PNG_FP_SAW_DIGIT: the string is valid. */ 1768#define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT) 1769#define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK) 1770#define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK) 1771 1772/* The actual parser. This can be called repeatedly. It updates 1773 * the index into the string and the state variable (which must 1774 * be initialized to 0). It returns a result code, as above. There 1775 * is no point calling the parser any more if it fails to advance to 1776 * the end of the string - it is stuck on an invalid character (or 1777 * terminated by '\0'). 1778 * 1779 * Note that the pointer will consume an E or even an E+ and then leave 1780 * a 'maybe' state even though a preceding integer.fraction is valid. 1781 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was 1782 * a valid number. It's possible to recover from this by calling 1783 * the parser again (from the start, with state 0) but with a string 1784 * that omits the last character (i.e. set the size to the index of 1785 * the problem character.) This has not been tested within libpng. 1786 */ 1787PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string, 1788 png_size_t size, int *statep, png_size_tp whereami),PNG_EMPTY); 1789 1790/* This is the same but it checks a complete string and returns true 1791 * only if it just contains a floating point number. As of 1.5.4 this 1792 * function also returns the state at the end of parsing the number if 1793 * it was valid (otherwise it returns 0.) This can be used for testing 1794 * for negative or zero values using the sticky flag. 1795 */ 1796PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string, 1797 png_size_t size),PNG_EMPTY); 1798#endif /* pCAL || sCAL */ 1799 1800#if defined(PNG_GAMMA_SUPPORTED) ||\ 1801 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED) 1802/* Added at libpng version 1.5.0 */ 1803/* This is a utility to provide a*times/div (rounded) and indicate 1804 * if there is an overflow. The result is a boolean - false (0) 1805 * for overflow, true (1) if no overflow, in which case *res 1806 * holds the result. 1807 */ 1808PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a, 1809 png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY); 1810#endif 1811 1812#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED) 1813/* Same deal, but issue a warning on overflow and return 0. */ 1814PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn, 1815 (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by, 1816 png_int_32 divided_by),PNG_EMPTY); 1817#endif 1818 1819#ifdef PNG_GAMMA_SUPPORTED 1820/* Calculate a reciprocal - used for gamma values. This returns 1821 * 0 if the argument is 0 in order to maintain an undefined value; 1822 * there are no warnings. 1823 */ 1824PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a), 1825 PNG_EMPTY); 1826 1827#ifdef PNG_READ_GAMMA_SUPPORTED 1828/* The same but gives a reciprocal of the product of two fixed point 1829 * values. Accuracy is suitable for gamma calculations but this is 1830 * not exact - use png_muldiv for that. Only required at present on read. 1831 */ 1832PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a, 1833 png_fixed_point b),PNG_EMPTY); 1834#endif 1835 1836/* Return true if the gamma value is significantly different from 1.0 */ 1837PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value), 1838 PNG_EMPTY); 1839#endif 1840 1841#ifdef PNG_READ_GAMMA_SUPPORTED 1842/* Internal fixed point gamma correction. These APIs are called as 1843 * required to convert single values - they don't need to be fast, 1844 * they are not used when processing image pixel values. 1845 * 1846 * While the input is an 'unsigned' value it must actually be the 1847 * correct bit value - 0..255 or 0..65535 as required. 1848 */ 1849PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr, 1850 unsigned int value, png_fixed_point gamma_value),PNG_EMPTY); 1851PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value, 1852 png_fixed_point gamma_value),PNG_EMPTY); 1853PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value, 1854 png_fixed_point gamma_value),PNG_EMPTY); 1855PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr), 1856 PNG_EMPTY); 1857PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr, 1858 int bit_depth),PNG_EMPTY); 1859#endif 1860 1861/* SIMPLIFIED READ/WRITE SUPPORT */ 1862#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 1863 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 1864/* The internal structure that png_image::opaque points to. */ 1865typedef struct png_control 1866{ 1867 png_structp png_ptr; 1868 png_infop info_ptr; 1869 png_voidp error_buf; /* Always a jmp_buf at present. */ 1870 1871 png_const_bytep memory; /* Memory buffer. */ 1872 png_size_t size; /* Size of the memory buffer. */ 1873 1874 unsigned int for_write :1; /* Otherwise it is a read structure */ 1875 unsigned int owned_file :1; /* We own the file in io_ptr */ 1876} png_control; 1877 1878/* Return the pointer to the jmp_buf from a png_control: necessary because C 1879 * does not reveal the type of the elements of jmp_buf. 1880 */ 1881#ifdef __cplusplus 1882# define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0]) 1883#else 1884# define png_control_jmp_buf(pc) ((pc)->error_buf) 1885#endif 1886 1887/* Utility to safely execute a piece of libpng code catching and logging any 1888 * errors that might occur. Returns true on success, false on failure (either 1889 * of the function or as a result of a png_error.) 1890 */ 1891PNG_INTERNAL_CALLBACK(void,png_safe_error,(png_structp png_ptr, 1892 png_const_charp error_message),PNG_NORETURN); 1893 1894#ifdef PNG_WARNINGS_SUPPORTED 1895PNG_INTERNAL_CALLBACK(void,png_safe_warning,(png_structp png_ptr, 1896 png_const_charp warning_message),PNG_EMPTY); 1897#else 1898# define png_safe_warning 0/*dummy argument*/ 1899#endif 1900 1901PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image, 1902 int (*function)(png_voidp), png_voidp arg),PNG_EMPTY); 1903 1904/* Utility to log an error; this also cleans up the png_image; the function 1905 * always returns 0 (false). 1906 */ 1907PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image, 1908 png_const_charp error_message),PNG_EMPTY); 1909 1910#ifndef PNG_SIMPLIFIED_READ_SUPPORTED 1911/* png_image_free is used by the write code but not exported */ 1912PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY); 1913#endif /* !SIMPLIFIED_READ */ 1914 1915#endif /* SIMPLIFIED READ/WRITE */ 1916 1917/* These are initialization functions for hardware specific PNG filter 1918 * optimizations; list these here then select the appropriate one at compile 1919 * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined 1920 * the generic code is used. 1921 */ 1922#ifdef PNG_FILTER_OPTIMIZATIONS 1923PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr, 1924 unsigned int bpp), PNG_EMPTY); 1925 /* Just declare the optimization that will be used */ 1926#else 1927 /* List *all* the possible optimizations here - this branch is required if 1928 * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in 1929 * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing. 1930 */ 1931PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon, 1932 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 1933#endif 1934 1935#ifdef PNG_INDEX_SUPPORTED 1936PNG_INTERNAL_FUNCTION(void, png_seek_data, (png_structp png_ptr, 1937 png_uint_32 length), PNG_EMPTY); 1938PNG_INTERNAL_FUNCTION(int, png_opt_crc_finish,(png_structrp png_ptr, 1939 png_uint_32 skip), PNG_EMPTY); 1940PNG_INTERNAL_FUNCTION(void, png_set_interlaced_pass,(png_structrp png_ptr, 1941 int pass), PNG_EMPTY); 1942#endif 1943 1944/* Maintainer: Put new private prototypes here ^ */ 1945 1946#include "pngdebug.h" 1947 1948#ifdef __cplusplus 1949} 1950#endif 1951 1952#endif /* PNG_VERSION_INFO_ONLY */ 1953#endif /* PNGPRIV_H */ 1954