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) 1998-2013 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 1.6.3 [July 18, 2013] 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 # ifdef __ARM_NEON__ 118 # define PNG_ARM_NEON_OPT 2 119 # else 120 # define PNG_ARM_NEON_OPT 0 121 # endif 122 #endif 123 124 #if PNG_ARM_NEON_OPT > 0 125 /* NEON optimizations are to be at least considered by libpng, so enable the 126 * callbacks to do this. 127 */ 128 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_neon 129 #endif 130 131 /* Is this a build of a DLL where compilation of the object modules requires 132 * different preprocessor settings to those required for a simple library? If 133 * so PNG_BUILD_DLL must be set. 134 * 135 * If libpng is used inside a DLL but that DLL does not export the libpng APIs 136 * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a 137 * static library of libpng then link the DLL against that. 138 */ 139 #ifndef PNG_BUILD_DLL 140 # ifdef DLL_EXPORT 141 /* This is set by libtool when files are compiled for a DLL; libtool 142 * always compiles twice, even on systems where it isn't necessary. Set 143 * PNG_BUILD_DLL in case it is necessary: 144 */ 145 # define PNG_BUILD_DLL 146 # else 147 # ifdef _WINDLL 148 /* This is set by the Microsoft Visual Studio IDE in projects that 149 * build a DLL. It can't easily be removed from those projects (it 150 * isn't visible in the Visual Studio UI) so it is a fairly reliable 151 * indication that PNG_IMPEXP needs to be set to the DLL export 152 * attributes. 153 */ 154 # define PNG_BUILD_DLL 155 # else 156 # ifdef __DLL__ 157 /* This is set by the Borland C system when compiling for a DLL 158 * (as above.) 159 */ 160 # define PNG_BUILD_DLL 161 # else 162 /* Add additional compiler cases here. */ 163 # endif 164 # endif 165 # endif 166 #endif /* Setting PNG_BUILD_DLL if required */ 167 168 /* See pngconf.h for more details: the builder of the library may set this on 169 * the command line to the right thing for the specific compilation system or it 170 * may be automagically set above (at present we know of no system where it does 171 * need to be set on the command line.) 172 * 173 * PNG_IMPEXP must be set here when building the library to prevent pngconf.h 174 * setting it to the "import" setting for a DLL build. 175 */ 176 #ifndef PNG_IMPEXP 177 # ifdef PNG_BUILD_DLL 178 # define PNG_IMPEXP PNG_DLL_EXPORT 179 # else 180 /* Not building a DLL, or the DLL doesn't require specific export 181 * definitions. 182 */ 183 # define PNG_IMPEXP 184 # endif 185 #endif 186 187 /* No warnings for private or deprecated functions in the build: */ 188 #ifndef PNG_DEPRECATED 189 # define PNG_DEPRECATED 190 #endif 191 #ifndef PNG_PRIVATE 192 # define PNG_PRIVATE 193 #endif 194 195 /* Symbol preprocessing support. 196 * 197 * To enable listing global, but internal, symbols the following macros should 198 * always be used to declare an extern data or function object in this file. 199 */ 200 #ifndef PNG_INTERNAL_DATA 201 # define PNG_INTERNAL_DATA(type, name, array) extern type name array 202 #endif 203 204 #ifndef PNG_INTERNAL_FUNCTION 205 # define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\ 206 extern PNG_FUNCTION(type, name, args, PNG_EMPTY attributes) 207 #endif 208 209 /* If floating or fixed point APIs are disabled they may still be compiled 210 * internally. To handle this make sure they are declared as the appropriate 211 * internal extern function (otherwise the symbol prefixing stuff won't work and 212 * the functions will be used without definitions.) 213 * 214 * NOTE: although all the API functions are declared here they are not all 215 * actually built! Because the declarations are still made it is necessary to 216 * fake out types that they depend on. 217 */ 218 #ifndef PNG_FP_EXPORT 219 # ifndef PNG_FLOATING_POINT_SUPPORTED 220 # define PNG_FP_EXPORT(ordinal, type, name, args)\ 221 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 222 # ifndef PNG_VERSION_INFO_ONLY 223 typedef struct png_incomplete png_double; 224 typedef png_double* png_doublep; 225 typedef const png_double* png_const_doublep; 226 typedef png_double** png_doublepp; 227 # endif 228 # endif 229 #endif 230 #ifndef PNG_FIXED_EXPORT 231 # ifndef PNG_FIXED_POINT_SUPPORTED 232 # define PNG_FIXED_EXPORT(ordinal, type, name, args)\ 233 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 234 # endif 235 #endif 236 237 #include "png.h" 238 239 /* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */ 240 #ifndef PNG_DLL_EXPORT 241 # define PNG_DLL_EXPORT 242 #endif 243 244 /* SECURITY and SAFETY: 245 * 246 * By default libpng is built without any internal limits on image size, 247 * individual heap (png_malloc) allocations or the total amount of memory used. 248 * If PNG_SAFE_LIMITS_SUPPORTED is defined, however, the limits below are used 249 * (unless individually overridden). These limits are believed to be fairly 250 * safe, but builders of secure systems should verify the values against the 251 * real system capabilities. 252 */ 253 #ifdef PNG_SAFE_LIMITS_SUPPORTED 254 /* 'safe' limits */ 255 # ifndef PNG_USER_WIDTH_MAX 256 # define PNG_USER_WIDTH_MAX 1000000 257 # endif 258 # ifndef PNG_USER_HEIGHT_MAX 259 # define PNG_USER_HEIGHT_MAX 1000000 260 # endif 261 # ifndef PNG_USER_CHUNK_CACHE_MAX 262 # define PNG_USER_CHUNK_CACHE_MAX 128 263 # endif 264 # ifndef PNG_USER_CHUNK_MALLOC_MAX 265 # define PNG_USER_CHUNK_MALLOC_MAX 8000000 266 # endif 267 #else 268 /* values for no limits */ 269 # ifndef PNG_USER_WIDTH_MAX 270 # define PNG_USER_WIDTH_MAX 0x7fffffff 271 # endif 272 # ifndef PNG_USER_HEIGHT_MAX 273 # define PNG_USER_HEIGHT_MAX 0x7fffffff 274 # endif 275 # ifndef PNG_USER_CHUNK_CACHE_MAX 276 # define PNG_USER_CHUNK_CACHE_MAX 0 277 # endif 278 # ifndef PNG_USER_CHUNK_MALLOC_MAX 279 # define PNG_USER_CHUNK_MALLOC_MAX 0 280 # endif 281 #endif 282 283 /* Moved to pngpriv.h at libpng-1.5.0 */ 284 /* NOTE: some of these may have been used in external applications as 285 * these definitions were exposed in pngconf.h prior to 1.5. 286 */ 287 288 /* If you are running on a machine where you cannot allocate more 289 * than 64K of memory at once, uncomment this. While libpng will not 290 * normally need that much memory in a chunk (unless you load up a very 291 * large file), zlib needs to know how big of a chunk it can use, and 292 * libpng thus makes sure to check any memory allocation to verify it 293 * will fit into memory. 294 * 295 * zlib provides 'MAXSEG_64K' which, if defined, indicates the 296 * same limit and pngconf.h (already included) sets the limit 297 * if certain operating systems are detected. 298 */ 299 #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K) 300 # define PNG_MAX_MALLOC_64K 301 #endif 302 303 #ifndef PNG_UNUSED 304 /* Unused formal parameter warnings are silenced using the following macro 305 * which is expected to have no bad effects on performance (optimizing 306 * compilers will probably remove it entirely). Note that if you replace 307 * it with something other than whitespace, you must include the terminating 308 * semicolon. 309 */ 310 # define PNG_UNUSED(param) (void)param; 311 #endif 312 313 /* Just a little check that someone hasn't tried to define something 314 * contradictory. 315 */ 316 #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K) 317 # undef PNG_ZBUF_SIZE 318 # define PNG_ZBUF_SIZE 65536L 319 #endif 320 321 /* If warnings or errors are turned off the code is disabled or redirected here. 322 * From 1.5.4 functions have been added to allow very limited formatting of 323 * error and warning messages - this code will also be disabled here. 324 */ 325 #ifdef PNG_WARNINGS_SUPPORTED 326 # define PNG_WARNING_PARAMETERS(p) png_warning_parameters p; 327 #else 328 # define png_warning(s1,s2) ((void)(s1)) 329 # define png_chunk_warning(s1,s2) ((void)(s1)) 330 # define png_warning_parameter(p,number,string) ((void)0) 331 # define png_warning_parameter_unsigned(p,number,format,value) ((void)0) 332 # define png_warning_parameter_signed(p,number,format,value) ((void)0) 333 # define png_formatted_warning(pp,p,message) ((void)(pp)) 334 # define PNG_WARNING_PARAMETERS(p) 335 #endif 336 #ifndef PNG_ERROR_TEXT_SUPPORTED 337 # define png_error(s1,s2) png_err(s1) 338 # define png_chunk_error(s1,s2) png_err(s1) 339 # define png_fixed_error(s1,s2) png_err(s1) 340 #endif 341 342 /* C allows up-casts from (void*) to any pointer and (const void*) to any 343 * pointer to a const object. C++ regards this as a type error and requires an 344 * explicit, static, cast and provides the static_cast<> rune to ensure that 345 * const is not cast away. 346 */ 347 #ifdef __cplusplus 348 # define png_voidcast(type, value) static_cast<type>(value) 349 # define png_constcast(type, value) const_cast<type>(value) 350 # define png_aligncast(type, value) \ 351 static_cast<type>(static_cast<void*>(value)) 352 # define png_aligncastconst(type, value) \ 353 static_cast<type>(static_cast<const void*>(value)) 354 #else 355 # define png_voidcast(type, value) (value) 356 # define png_constcast(type, value) ((type)(value)) 357 # define png_aligncast(type, value) ((void*)(value)) 358 # define png_aligncastconst(type, value) ((const void*)(value)) 359 #endif /* __cplusplus */ 360 361 /* Some fixed point APIs are still required even if not exported because 362 * they get used by the corresponding floating point APIs. This magic 363 * deals with this: 364 */ 365 #ifdef PNG_FIXED_POINT_SUPPORTED 366 # define PNGFAPI PNGAPI 367 #else 368 # define PNGFAPI /* PRIVATE */ 369 #endif 370 371 #ifndef PNG_VERSION_INFO_ONLY 372 /* Other defines specific to compilers can go here. Try to keep 373 * them inside an appropriate ifdef/endif pair for portability. 374 */ 375 #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\ 376 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) 377 /* png.c requires the following ANSI-C constants if the conversion of 378 * floating point to ASCII is implemented therein: 379 * 380 * DBL_DIG Maximum number of decimal digits (can be set to any constant) 381 * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value) 382 * DBL_MAX Maximum floating point number (can be set to an arbitrary value) 383 */ 384 # include <float.h> 385 386 # if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \ 387 defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC) 388 /* We need to check that <math.h> hasn't already been included earlier 389 * as it seems it doesn't agree with <fp.h>, yet we should really use 390 * <fp.h> if possible. 391 */ 392 # if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__) 393 # include <fp.h> 394 # endif 395 # else 396 # include <math.h> 397 # endif 398 # if defined(_AMIGA) && defined(__SASC) && defined(_M68881) 399 /* Amiga SAS/C: We must include builtin FPU functions when compiling using 400 * MATH=68881 401 */ 402 # include <m68881.h> 403 # endif 404 #endif 405 406 /* This provides the non-ANSI (far) memory allocation routines. */ 407 #if defined(__TURBOC__) && defined(__MSDOS__) 408 # include <mem.h> 409 # include <alloc.h> 410 #endif 411 412 #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \ 413 defined(_WIN32) || defined(__WIN32__) 414 # include <windows.h> /* defines _WINDOWS_ macro */ 415 #endif 416 #endif /* PNG_VERSION_INFO_ONLY */ 417 418 /* Moved here around 1.5.0beta36 from pngconf.h */ 419 /* Users may want to use these so they are not private. Any library 420 * functions that are passed far data must be model-independent. 421 */ 422 423 /* Memory model/platform independent fns */ 424 #ifndef PNG_ABORT 425 # ifdef _WINDOWS_ 426 # define PNG_ABORT() ExitProcess(0) 427 # else 428 # define PNG_ABORT() abort() 429 # endif 430 #endif 431 432 /* These macros may need to be architecture dependent. */ 433 #define PNG_ALIGN_NONE 0 /* do not use data alignment */ 434 #define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */ 435 #ifdef offsetof 436 # define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */ 437 #else 438 # define PNG_ALIGN_OFFSET -1 /* prevent the use of this */ 439 #endif 440 #define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */ 441 442 #ifndef PNG_ALIGN_TYPE 443 /* Default to using aligned access optimizations and requiring alignment to a 444 * multiple of the data type size. Override in a compiler specific fashion 445 * if necessary by inserting tests here: 446 */ 447 # define PNG_ALIGN_TYPE PNG_ALIGN_SIZE 448 #endif 449 450 #if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE 451 /* This is used because in some compiler implementations non-aligned 452 * structure members are supported, so the offsetof approach below fails. 453 * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access 454 * is good for performance. Do not do this unless you have tested the result 455 * and understand it. 456 */ 457 # define png_alignof(type) (sizeof (type)) 458 #else 459 # if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET 460 # define png_alignof(type) offsetof(struct{char c; type t;}, t) 461 # else 462 # if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS 463 # define png_alignof(type) (1) 464 # endif 465 /* Else leave png_alignof undefined to prevent use thereof */ 466 # endif 467 #endif 468 469 /* This implicitly assumes alignment is always to a power of 2. */ 470 #ifdef png_alignof 471 # define png_isaligned(ptr, type)\ 472 ((((const char*)ptr-(const char*)0) & (png_alignof(type)-1)) == 0) 473 #else 474 # define png_isaligned(ptr, type) 0 475 #endif 476 477 /* End of memory model/platform independent support */ 478 /* End of 1.5.0beta36 move from pngconf.h */ 479 480 /* CONSTANTS and UTILITY MACROS 481 * These are used internally by libpng and not exposed in the API 482 */ 483 484 /* Various modes of operation. Note that after an init, mode is set to 485 * zero automatically when the structure is created. Three of these 486 * are defined in png.h because they need to be visible to applications 487 * that call png_set_unknown_chunk(). 488 */ 489 /* #define PNG_HAVE_IHDR 0x01 (defined in png.h) */ 490 /* #define PNG_HAVE_PLTE 0x02 (defined in png.h) */ 491 #define PNG_HAVE_IDAT 0x04 492 /* #define PNG_AFTER_IDAT 0x08 (defined in png.h) */ 493 #define PNG_HAVE_IEND 0x10 494 /* 0x20 (unused) */ 495 /* 0x40 (unused) */ 496 /* 0x80 (unused) */ 497 #define PNG_HAVE_CHUNK_HEADER 0x100 498 #define PNG_WROTE_tIME 0x200 499 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400 500 #define PNG_BACKGROUND_IS_GRAY 0x800 501 #define PNG_HAVE_PNG_SIGNATURE 0x1000 502 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ 503 /* 0x4000 (unused) */ 504 #define PNG_IS_READ_STRUCT 0x8000 /* Else is a write struct */ 505 506 /* Flags for the transformations the PNG library does on the image data */ 507 #define PNG_BGR 0x0001 508 #define PNG_INTERLACE 0x0002 509 #define PNG_PACK 0x0004 510 #define PNG_SHIFT 0x0008 511 #define PNG_SWAP_BYTES 0x0010 512 #define PNG_INVERT_MONO 0x0020 513 #define PNG_QUANTIZE 0x0040 514 #define PNG_COMPOSE 0x0080 /* Was PNG_BACKGROUND */ 515 #define PNG_BACKGROUND_EXPAND 0x0100 516 #define PNG_EXPAND_16 0x0200 /* Added to libpng 1.5.2 */ 517 #define PNG_16_TO_8 0x0400 /* Becomes 'chop' in 1.5.4 */ 518 #define PNG_RGBA 0x0800 519 #define PNG_EXPAND 0x1000 520 #define PNG_GAMMA 0x2000 521 #define PNG_GRAY_TO_RGB 0x4000 522 #define PNG_FILLER 0x8000 523 #define PNG_PACKSWAP 0x10000 524 #define PNG_SWAP_ALPHA 0x20000 525 #define PNG_STRIP_ALPHA 0x40000 526 #define PNG_INVERT_ALPHA 0x80000 527 #define PNG_USER_TRANSFORM 0x100000 528 #define PNG_RGB_TO_GRAY_ERR 0x200000 529 #define PNG_RGB_TO_GRAY_WARN 0x400000 530 #define PNG_RGB_TO_GRAY 0x600000 /* two bits, RGB_TO_GRAY_ERR|WARN */ 531 #define PNG_ENCODE_ALPHA 0x800000 /* Added to libpng-1.5.4 */ 532 #define PNG_ADD_ALPHA 0x1000000 /* Added to libpng-1.2.7 */ 533 #define PNG_EXPAND_tRNS 0x2000000 /* Added to libpng-1.2.9 */ 534 #define PNG_SCALE_16_TO_8 0x4000000 /* Added to libpng-1.5.4 */ 535 /* 0x8000000 unused */ 536 /* 0x10000000 unused */ 537 /* 0x20000000 unused */ 538 /* 0x40000000 unused */ 539 /* Flags for png_create_struct */ 540 #define PNG_STRUCT_PNG 0x0001 541 #define PNG_STRUCT_INFO 0x0002 542 543 /* Scaling factor for filter heuristic weighting calculations */ 544 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) 545 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) 546 547 /* Flags for the png_ptr->flags rather than declaring a byte for each one */ 548 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 549 #define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002 /* Added to libpng-1.6.0 */ 550 /* 0x0004 unused */ 551 #define PNG_FLAG_ZSTREAM_ENDED 0x0008 /* Added to libpng-1.6.0 */ 552 /* 0x0010 unused */ 553 /* 0x0020 unused */ 554 #define PNG_FLAG_ROW_INIT 0x0040 555 #define PNG_FLAG_FILLER_AFTER 0x0080 556 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 557 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 558 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 559 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 560 #define PNG_FLAG_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.4 */ 561 #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.4 */ 562 #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.4 */ 563 /* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000 */ 564 /* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000 */ 565 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000 566 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000 567 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000 568 #define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000 /* Added to libpng-1.4.0 */ 569 #define PNG_FLAG_APP_WARNINGS_WARN 0x200000 /* Added to libpng-1.6.0 */ 570 #define PNG_FLAG_APP_ERRORS_WARN 0x400000 /* Added to libpng-1.6.0 */ 571 /* 0x800000 unused */ 572 /* 0x1000000 unused */ 573 /* 0x2000000 unused */ 574 /* 0x4000000 unused */ 575 /* 0x8000000 unused */ 576 /* 0x10000000 unused */ 577 /* 0x20000000 unused */ 578 /* 0x40000000 unused */ 579 580 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 581 PNG_FLAG_CRC_ANCILLARY_NOWARN) 582 583 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 584 PNG_FLAG_CRC_CRITICAL_IGNORE) 585 586 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 587 PNG_FLAG_CRC_CRITICAL_MASK) 588 589 /* Save typing and make code easier to understand */ 590 591 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 592 abs((int)((c1).green) - (int)((c2).green)) + \ 593 abs((int)((c1).blue) - (int)((c2).blue))) 594 595 /* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255 596 * by dividing by 257 *with rounding*. This macro is exact for the given range. 597 * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the 598 * macro were established by experiment (modifying the added value). The macro 599 * has a second variant that takes a value already scaled by 255 and divides by 600 * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it 601 * only gives off-by-one errors and only for 0.5% (1 in 200) of the values. 602 */ 603 #define PNG_DIV65535(v24) (((v24) + 32895) >> 16) 604 #define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255) 605 606 /* Added to libpng-1.2.6 JB */ 607 #define PNG_ROWBYTES(pixel_bits, width) \ 608 ((pixel_bits) >= 8 ? \ 609 ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \ 610 (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) ) 611 612 /* PNG_OUT_OF_RANGE returns true if value is outside the range 613 * ideal-delta..ideal+delta. Each argument is evaluated twice. 614 * "ideal" and "delta" should be constants, normally simple 615 * integers, "value" a variable. Added to libpng-1.2.6 JB 616 */ 617 #define PNG_OUT_OF_RANGE(value, ideal, delta) \ 618 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 619 620 /* Conversions between fixed and floating point, only defined if 621 * required (to make sure the code doesn't accidentally use float 622 * when it is supposedly disabled.) 623 */ 624 #ifdef PNG_FLOATING_POINT_SUPPORTED 625 /* The floating point conversion can't overflow, though it can and 626 * does lose accuracy relative to the original fixed point value. 627 * In practice this doesn't matter because png_fixed_point only 628 * stores numbers with very low precision. The png_ptr and s 629 * arguments are unused by default but are there in case error 630 * checking becomes a requirement. 631 */ 632 #define png_float(png_ptr, fixed, s) (.00001 * (fixed)) 633 634 /* The fixed point conversion performs range checking and evaluates 635 * its argument multiple times, so must be used with care. The 636 * range checking uses the PNG specification values for a signed 637 * 32 bit fixed point value except that the values are deliberately 638 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly 639 * (2^31-1) * 100000). 's' is a string that describes the value being 640 * converted. 641 * 642 * NOTE: this macro will raise a png_error if the range check fails, 643 * therefore it is normally only appropriate to use this on values 644 * that come from API calls or other sources where an out of range 645 * error indicates a programming error, not a data error! 646 * 647 * NOTE: by default this is off - the macro is not used - because the 648 * function call saves a lot of code. 649 */ 650 #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED 651 #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\ 652 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0)) 653 #endif 654 /* else the corresponding function is defined below, inside the scope of the 655 * cplusplus test. 656 */ 657 #endif 658 659 /* Constants for known chunk types. If you need to add a chunk, define the name 660 * here. For historical reasons these constants have the form png_<name>; i.e. 661 * the prefix is lower case. Please use decimal values as the parameters to 662 * match the ISO PNG specification and to avoid relying on the C locale 663 * interpretation of character values. 664 * 665 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values 666 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string 667 * to be generated if required. 668 * 669 * PNG_32b correctly produces a value shifted by up to 24 bits, even on 670 * architectures where (int) is only 16 bits. 671 */ 672 #define PNG_32b(b,s) ((png_uint_32)(b) << (s)) 673 #define PNG_U32(b1,b2,b3,b4) \ 674 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0)) 675 676 /* Constants for known chunk types. 677 * 678 * MAINTAINERS: If you need to add a chunk, define the name here. 679 * For historical reasons these constants have the form png_<name>; i.e. 680 * the prefix is lower case. Please use decimal values as the parameters to 681 * match the ISO PNG specification and to avoid relying on the C locale 682 * interpretation of character values. Please keep the list sorted. 683 * 684 * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk 685 * type. In fact the specification does not express chunk types this way, 686 * however using a 32-bit value means that the chunk type can be read from the 687 * stream using exactly the same code as used for a 32-bit unsigned value and 688 * can be examined far more efficiently (using one arithmetic compare). 689 * 690 * Prior to 1.5.6 the chunk type constants were expressed as C strings. The 691 * libpng API still uses strings for 'unknown' chunks and a macro, 692 * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice 693 * that for portable code numeric values must still be used; the string "IHDR" 694 * is not portable and neither is PNG_U32('I', 'H', 'D', 'R'). 695 * 696 * In 1.7.0 the definitions will be made public in png.h to avoid having to 697 * duplicate the same definitions in application code. 698 */ 699 #define png_IDAT PNG_U32( 73, 68, 65, 84) 700 #define png_IEND PNG_U32( 73, 69, 78, 68) 701 #define png_IHDR PNG_U32( 73, 72, 68, 82) 702 #define png_PLTE PNG_U32( 80, 76, 84, 69) 703 #define png_bKGD PNG_U32( 98, 75, 71, 68) 704 #define png_cHRM PNG_U32( 99, 72, 82, 77) 705 #define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */ 706 #define png_gAMA PNG_U32(103, 65, 77, 65) 707 #define png_gIFg PNG_U32(103, 73, 70, 103) 708 #define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */ 709 #define png_gIFx PNG_U32(103, 73, 70, 120) 710 #define png_hIST PNG_U32(104, 73, 83, 84) 711 #define png_iCCP PNG_U32(105, 67, 67, 80) 712 #define png_iTXt PNG_U32(105, 84, 88, 116) 713 #define png_oFFs PNG_U32(111, 70, 70, 115) 714 #define png_pCAL PNG_U32(112, 67, 65, 76) 715 #define png_pHYs PNG_U32(112, 72, 89, 115) 716 #define png_sBIT PNG_U32(115, 66, 73, 84) 717 #define png_sCAL PNG_U32(115, 67, 65, 76) 718 #define png_sPLT PNG_U32(115, 80, 76, 84) 719 #define png_sRGB PNG_U32(115, 82, 71, 66) 720 #define png_sTER PNG_U32(115, 84, 69, 82) 721 #define png_tEXt PNG_U32(116, 69, 88, 116) 722 #define png_tIME PNG_U32(116, 73, 77, 69) 723 #define png_tRNS PNG_U32(116, 82, 78, 83) 724 #define png_zTXt PNG_U32(122, 84, 88, 116) 725 726 /* The following will work on (signed char*) strings, whereas the get_uint_32 727 * macro will fail on top-bit-set values because of the sign extension. 728 */ 729 #define PNG_CHUNK_FROM_STRING(s)\ 730 PNG_U32(0xff&(s)[0], 0xff&(s)[1], 0xff&(s)[2], 0xff&(s)[3]) 731 732 /* This uses (char), not (png_byte) to avoid warnings on systems where (char) is 733 * signed and the argument is a (char[]) This macro will fail miserably on 734 * systems where (char) is more than 8 bits. 735 */ 736 #define PNG_STRING_FROM_CHUNK(s,c)\ 737 (void)(((char*)(s))[0]=(char)((c)>>24), ((char*)(s))[1]=(char)((c)>>16),\ 738 ((char*)(s))[2]=(char)((c)>>8), ((char*)(s))[3]=(char)((c))) 739 740 /* Do the same but terminate with a null character. */ 741 #define PNG_CSTRING_FROM_CHUNK(s,c)\ 742 (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0) 743 744 /* Test on flag values as defined in the spec (section 5.4): */ 745 #define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29)) 746 #define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c)) 747 #define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21)) 748 #define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13)) 749 #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5)) 750 751 /* Gamma values (new at libpng-1.5.4): */ 752 #define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */ 753 #define PNG_GAMMA_MAC_INVERSE 65909 754 #define PNG_GAMMA_sRGB_INVERSE 45455 755 756 /* Almost everything below is C specific; the #defines above can be used in 757 * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot. 758 */ 759 #ifndef PNG_VERSION_INFO_ONLY 760 761 #include "pngstruct.h" 762 #include "pnginfo.h" 763 764 /* Validate the include paths - the include path used to generate pnglibconf.h 765 * must match that used in the build, or we must be using pnglibconf.h.prebuilt: 766 */ 767 #if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM 768 # error ZLIB_VERNUM != PNG_ZLIB_VERNUM \ 769 "-I (include path) error: see the notes in pngpriv.h" 770 /* This means that when pnglibconf.h was built the copy of zlib.h that it 771 * used is not the same as the one being used here. Because the build of 772 * libpng makes decisions to use inflateInit2 and inflateReset2 based on the 773 * zlib version number and because this affects handling of certain broken 774 * PNG files the -I directives must match. 775 * 776 * The most likely explanation is that you passed a -I in CFLAGS, this will 777 * not work; all the preprocessor directories and in particular all the -I 778 * directives must be in CPPFLAGS. 779 */ 780 #endif 781 782 /* This is used for 16 bit gamma tables -- only the top level pointers are 783 * const; this could be changed: 784 */ 785 typedef const png_uint_16p * png_const_uint_16pp; 786 787 /* Added to libpng-1.5.7: sRGB conversion tables */ 788 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 789 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 790 #ifdef PNG_SIMPLIFIED_READ_SUPPORTED 791 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]); 792 /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value, 793 * 0..65535. This table gives the closest 16-bit answers (no errors). 794 */ 795 #endif 796 797 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]); 798 PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]); 799 800 #define PNG_sRGB_FROM_LINEAR(linear) ((png_byte)((png_sRGB_base[(linear)>>15] +\ 801 ((((linear)&0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8)) 802 /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB 803 * encoded value with maximum error 0.646365. Note that the input is not a 804 * 16-bit value; it has been multiplied by 255! */ 805 #endif /* PNG_SIMPLIFIED_READ/WRITE */ 806 807 808 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 809 #ifdef __cplusplus 810 extern "C" { 811 #endif /* __cplusplus */ 812 813 /* Internal functions; these are not exported from a DLL however because they 814 * are used within several of the C source files they have to be C extern. 815 * 816 * All of these functions must be declared with PNG_INTERNAL_FUNCTION. 817 */ 818 819 /* Zlib support */ 820 #define PNG_UNEXPECTED_ZLIB_RETURN (-7) 821 PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret), 822 PNG_EMPTY); 823 /* Used by the zlib handling functions to ensure that z_stream::msg is always 824 * set before they return. 825 */ 826 827 #ifdef PNG_WRITE_SUPPORTED 828 PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr, 829 png_compression_bufferp *list),PNG_EMPTY); 830 /* Free the buffer list used by the compressed write code. */ 831 #endif 832 833 #if defined(PNG_FLOATING_POINT_SUPPORTED) && \ 834 !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \ 835 (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \ 836 defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \ 837 defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \ 838 (defined(PNG_sCAL_SUPPORTED) && \ 839 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)) 840 PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr, 841 double fp, png_const_charp text),PNG_EMPTY); 842 #endif 843 844 /* Check the user version string for compatibility, returns false if the version 845 * numbers aren't compatible. 846 */ 847 PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr, 848 png_const_charp user_png_ver),PNG_EMPTY); 849 850 /* Internal base allocator - no messages, NULL on failure to allocate. This 851 * does, however, call the application provided allocator and that could call 852 * png_error (although that would be a bug in the application implementation.) 853 */ 854 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr, 855 png_alloc_size_t size),PNG_ALLOCATED); 856 857 #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\ 858 defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED) 859 /* Internal array allocator, outputs no error or warning messages on failure, 860 * just returns NULL. 861 */ 862 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr, 863 int nelements, size_t element_size),PNG_ALLOCATED); 864 865 /* The same but an existing array is extended by add_elements. This function 866 * also memsets the new elements to 0 and copies the old elements. The old 867 * array is not freed or altered. 868 */ 869 PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr, 870 png_const_voidp array, int old_elements, int add_elements, 871 size_t element_size),PNG_ALLOCATED); 872 #endif /* text, sPLT or unknown chunks */ 873 874 /* Magic to create a struct when there is no struct to call the user supplied 875 * memory allocators. Because error handling has not been set up the memory 876 * handlers can't safely call png_error, but this is an obscure and undocumented 877 * restriction so libpng has to assume that the 'free' handler, at least, might 878 * call png_error. 879 */ 880 PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct, 881 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, 882 png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, 883 png_free_ptr free_fn),PNG_ALLOCATED); 884 885 /* Free memory from internal libpng struct */ 886 PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr), 887 PNG_EMPTY); 888 889 /* Free an allocated jmp_buf (always succeeds) */ 890 PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY); 891 892 /* Function to allocate memory for zlib. PNGAPI is disallowed. */ 893 PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size), 894 PNG_ALLOCATED); 895 896 /* Function to free memory for zlib. PNGAPI is disallowed. */ 897 PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY); 898 899 /* Next four functions are used internally as callbacks. PNGCBAPI is required 900 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to 901 * PNGCBAPI at 1.5.0 902 */ 903 904 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr, 905 png_bytep data, png_size_t length),PNG_EMPTY); 906 907 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 908 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr, 909 png_bytep buffer, png_size_t length),PNG_EMPTY); 910 #endif 911 912 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr, 913 png_bytep data, png_size_t length),PNG_EMPTY); 914 915 #ifdef PNG_WRITE_FLUSH_SUPPORTED 916 # ifdef PNG_STDIO_SUPPORTED 917 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr), 918 PNG_EMPTY); 919 # endif 920 #endif 921 922 /* Reset the CRC variable */ 923 PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY); 924 925 /* Write the "data" buffer to whatever output you are using */ 926 PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr, 927 png_const_bytep data, png_size_t length),PNG_EMPTY); 928 929 /* Read and check the PNG file signature */ 930 PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr, 931 png_inforp info_ptr),PNG_EMPTY); 932 933 /* Read the chunk header (length + type name) */ 934 PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr), 935 PNG_EMPTY); 936 937 /* Read data from whatever input you are using into the "data" buffer */ 938 PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data, 939 png_size_t length),PNG_EMPTY); 940 941 /* Read bytes into buf, and update png_ptr->crc */ 942 PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf, 943 png_uint_32 length),PNG_EMPTY); 944 945 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 946 PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr, 947 png_uint_32 skip),PNG_EMPTY); 948 949 /* Read the CRC from the file and compare it to the libpng calculated CRC */ 950 PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY); 951 952 /* Calculate the CRC over a section of data. Note that we are only 953 * passing a maximum of 64K on systems that have this as a memory limit, 954 * since this is the maximum buffer size we can specify. 955 */ 956 PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr, 957 png_const_bytep ptr, png_size_t length),PNG_EMPTY); 958 959 #ifdef PNG_WRITE_FLUSH_SUPPORTED 960 PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY); 961 #endif 962 963 /* Write various chunks */ 964 965 /* Write the IHDR chunk, and update the png_struct with the necessary 966 * information. 967 */ 968 PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr, 969 png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, 970 int compression_method, int filter_method, int interlace_method),PNG_EMPTY); 971 972 PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr, 973 png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY); 974 975 PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr, 976 png_const_bytep row_data, png_alloc_size_t row_data_length, int flush), 977 PNG_EMPTY); 978 979 PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY); 980 981 #ifdef PNG_WRITE_gAMA_SUPPORTED 982 PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr, 983 png_fixed_point file_gamma),PNG_EMPTY); 984 #endif 985 986 #ifdef PNG_WRITE_sBIT_SUPPORTED 987 PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr, 988 png_const_color_8p sbit, int color_type),PNG_EMPTY); 989 #endif 990 991 #ifdef PNG_WRITE_cHRM_SUPPORTED 992 PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr, 993 const png_xy *xy), PNG_EMPTY); 994 /* The xy value must have been previously validated */ 995 #endif 996 997 #ifdef PNG_WRITE_sRGB_SUPPORTED 998 PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr, 999 int intent),PNG_EMPTY); 1000 #endif 1001 1002 #ifdef PNG_WRITE_iCCP_SUPPORTED 1003 PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr, 1004 png_const_charp name, png_const_bytep profile), PNG_EMPTY); 1005 /* The profile must have been previously validated for correctness, the 1006 * length comes from the first four bytes. Only the base, deflate, 1007 * compression is supported. 1008 */ 1009 #endif 1010 1011 #ifdef PNG_WRITE_sPLT_SUPPORTED 1012 PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr, 1013 png_const_sPLT_tp palette),PNG_EMPTY); 1014 #endif 1015 1016 #ifdef PNG_WRITE_tRNS_SUPPORTED 1017 PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr, 1018 png_const_bytep trans, png_const_color_16p values, int number, 1019 int color_type),PNG_EMPTY); 1020 #endif 1021 1022 #ifdef PNG_WRITE_bKGD_SUPPORTED 1023 PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr, 1024 png_const_color_16p values, int color_type),PNG_EMPTY); 1025 #endif 1026 1027 #ifdef PNG_WRITE_hIST_SUPPORTED 1028 PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr, 1029 png_const_uint_16p hist, int num_hist),PNG_EMPTY); 1030 #endif 1031 1032 /* Chunks that have keywords */ 1033 #ifdef PNG_WRITE_tEXt_SUPPORTED 1034 PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr, 1035 png_const_charp key, png_const_charp text, png_size_t text_len),PNG_EMPTY); 1036 #endif 1037 1038 #ifdef PNG_WRITE_zTXt_SUPPORTED 1039 PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp 1040 key, png_const_charp text, png_size_t text_len, int compression),PNG_EMPTY); 1041 #endif 1042 1043 #ifdef PNG_WRITE_iTXt_SUPPORTED 1044 PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr, 1045 int compression, png_const_charp key, png_const_charp lang, 1046 png_const_charp lang_key, png_const_charp text),PNG_EMPTY); 1047 #endif 1048 1049 #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ 1050 PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr, 1051 png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY); 1052 #endif 1053 1054 #ifdef PNG_WRITE_oFFs_SUPPORTED 1055 PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr, 1056 png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY); 1057 #endif 1058 1059 #ifdef PNG_WRITE_pCAL_SUPPORTED 1060 PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr, 1061 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, 1062 png_const_charp units, png_charpp params),PNG_EMPTY); 1063 #endif 1064 1065 #ifdef PNG_WRITE_pHYs_SUPPORTED 1066 PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr, 1067 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 1068 int unit_type),PNG_EMPTY); 1069 #endif 1070 1071 #ifdef PNG_WRITE_tIME_SUPPORTED 1072 PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr, 1073 png_const_timep mod_time),PNG_EMPTY); 1074 #endif 1075 1076 #ifdef PNG_WRITE_sCAL_SUPPORTED 1077 PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr, 1078 int unit, png_const_charp width, png_const_charp height),PNG_EMPTY); 1079 #endif 1080 1081 /* Called when finished processing a row of data */ 1082 PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr), 1083 PNG_EMPTY); 1084 1085 /* Internal use only. Called before first row of data */ 1086 PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr), 1087 PNG_EMPTY); 1088 1089 /* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an 1090 * array of png_ptr->width pixels. If the image is not interlaced or this 1091 * is the final pass this just does a memcpy, otherwise the "display" flag 1092 * is used to determine whether to copy pixels that are not in the current pass. 1093 * 1094 * Because 'png_do_read_interlace' (below) replicates pixels this allows this 1095 * function to achieve the documented 'blocky' appearance during interlaced read 1096 * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row' 1097 * are not changed if they are not in the current pass, when display is 0. 1098 * 1099 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless. 1100 * 1101 * The API always reads from the png_struct row buffer and always assumes that 1102 * it is full width (png_do_read_interlace has already been called.) 1103 * 1104 * This function is only ever used to write to row buffers provided by the 1105 * caller of the relevant libpng API and the row must have already been 1106 * transformed by the read transformations. 1107 * 1108 * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed 1109 * bitmasks for use within the code, otherwise runtime generated masks are used. 1110 * The default is compile time masks. 1111 */ 1112 #ifndef PNG_USE_COMPILE_TIME_MASKS 1113 # define PNG_USE_COMPILE_TIME_MASKS 1 1114 #endif 1115 PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr, 1116 png_bytep row, int display),PNG_EMPTY); 1117 1118 #ifdef PNG_READ_INTERLACING_SUPPORTED 1119 /* Expand an interlaced row: the 'row_info' describes the pass data that has 1120 * been read in and must correspond to the pixels in 'row', the pixels are 1121 * expanded (moved apart) in 'row' to match the final layout, when doing this 1122 * the pixels are *replicated* to the intervening space. This is essential for 1123 * the correct operation of png_combine_row, above. 1124 */ 1125 PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info, 1126 png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY); 1127 #endif 1128 1129 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 1130 1131 #ifdef PNG_WRITE_INTERLACING_SUPPORTED 1132 /* Grab pixels out of a row for an interlaced pass */ 1133 PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info, 1134 png_bytep row, int pass),PNG_EMPTY); 1135 #endif 1136 1137 /* Unfilter a row: check the filter value before calling this, there is no point 1138 * calling it for PNG_FILTER_VALUE_NONE. 1139 */ 1140 PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop 1141 row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY); 1142 1143 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info, 1144 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1145 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop 1146 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1147 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop 1148 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1149 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop 1150 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1151 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop 1152 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1153 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop 1154 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1155 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop 1156 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1157 1158 /* Choose the best filter to use and filter the row data */ 1159 PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr, 1160 png_row_infop row_info),PNG_EMPTY); 1161 1162 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED 1163 PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr, 1164 png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY); 1165 /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer 1166 * is NULL the function checks, instead, for the end of the stream. In this 1167 * case a benign error will be issued if the stream end is not found or if 1168 * extra data has to be consumed. 1169 */ 1170 PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr), 1171 PNG_EMPTY); 1172 /* This cleans up when the IDAT LZ stream does not end when the last image 1173 * byte is read; there is still some pending input. 1174 */ 1175 1176 PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr), 1177 PNG_EMPTY); 1178 /* Finish a row while reading, dealing with interlacing passes, etc. */ 1179 #endif 1180 1181 /* Initialize the row buffers, etc. */ 1182 PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY); 1183 1184 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1185 /* Optional call to update the users info structure */ 1186 PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr, 1187 png_inforp info_ptr),PNG_EMPTY); 1188 #endif 1189 1190 /* These are the functions that do the transformations */ 1191 #ifdef PNG_READ_FILLER_SUPPORTED 1192 PNG_INTERNAL_FUNCTION(void,png_do_read_filler,(png_row_infop row_info, 1193 png_bytep row, png_uint_32 filler, png_uint_32 flags),PNG_EMPTY); 1194 #endif 1195 1196 #ifdef PNG_READ_SWAP_ALPHA_SUPPORTED 1197 PNG_INTERNAL_FUNCTION(void,png_do_read_swap_alpha,(png_row_infop row_info, 1198 png_bytep row),PNG_EMPTY); 1199 #endif 1200 1201 #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED 1202 PNG_INTERNAL_FUNCTION(void,png_do_write_swap_alpha,(png_row_infop row_info, 1203 png_bytep row),PNG_EMPTY); 1204 #endif 1205 1206 #ifdef PNG_READ_INVERT_ALPHA_SUPPORTED 1207 PNG_INTERNAL_FUNCTION(void,png_do_read_invert_alpha,(png_row_infop row_info, 1208 png_bytep row),PNG_EMPTY); 1209 #endif 1210 1211 #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED 1212 PNG_INTERNAL_FUNCTION(void,png_do_write_invert_alpha,(png_row_infop row_info, 1213 png_bytep row),PNG_EMPTY); 1214 #endif 1215 1216 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 1217 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 1218 PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info, 1219 png_bytep row, int at_start),PNG_EMPTY); 1220 #endif 1221 1222 #ifdef PNG_16BIT_SUPPORTED 1223 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 1224 PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info, 1225 png_bytep row),PNG_EMPTY); 1226 #endif 1227 #endif 1228 1229 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ 1230 defined(PNG_WRITE_PACKSWAP_SUPPORTED) 1231 PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info, 1232 png_bytep row),PNG_EMPTY); 1233 #endif 1234 1235 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1236 PNG_INTERNAL_FUNCTION(int,png_do_rgb_to_gray,(png_structrp png_ptr, 1237 png_row_infop row_info, png_bytep row),PNG_EMPTY); 1238 #endif 1239 1240 #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED 1241 PNG_INTERNAL_FUNCTION(void,png_do_gray_to_rgb,(png_row_infop row_info, 1242 png_bytep row),PNG_EMPTY); 1243 #endif 1244 1245 #ifdef PNG_READ_PACK_SUPPORTED 1246 PNG_INTERNAL_FUNCTION(void,png_do_unpack,(png_row_infop row_info, 1247 png_bytep row),PNG_EMPTY); 1248 #endif 1249 1250 #ifdef PNG_READ_SHIFT_SUPPORTED 1251 PNG_INTERNAL_FUNCTION(void,png_do_unshift,(png_row_infop row_info, 1252 png_bytep row, png_const_color_8p sig_bits),PNG_EMPTY); 1253 #endif 1254 1255 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 1256 PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info, 1257 png_bytep row),PNG_EMPTY); 1258 #endif 1259 1260 #ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED 1261 PNG_INTERNAL_FUNCTION(void,png_do_scale_16_to_8,(png_row_infop row_info, 1262 png_bytep row),PNG_EMPTY); 1263 #endif 1264 1265 #ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED 1266 PNG_INTERNAL_FUNCTION(void,png_do_chop,(png_row_infop row_info, 1267 png_bytep row),PNG_EMPTY); 1268 #endif 1269 1270 #ifdef PNG_READ_QUANTIZE_SUPPORTED 1271 PNG_INTERNAL_FUNCTION(void,png_do_quantize,(png_row_infop row_info, 1272 png_bytep row, png_const_bytep palette_lookup, 1273 png_const_bytep quantize_lookup),PNG_EMPTY); 1274 1275 # ifdef PNG_CORRECT_PALETTE_SUPPORTED 1276 PNG_INTERNAL_FUNCTION(void,png_correct_palette,(png_structrp png_ptr, 1277 png_colorp palette, int num_palette),PNG_EMPTY); 1278 # endif 1279 #endif 1280 1281 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1282 PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info, 1283 png_bytep row),PNG_EMPTY); 1284 #endif 1285 1286 #ifdef PNG_WRITE_PACK_SUPPORTED 1287 PNG_INTERNAL_FUNCTION(void,png_do_pack,(png_row_infop row_info, 1288 png_bytep row, png_uint_32 bit_depth),PNG_EMPTY); 1289 #endif 1290 1291 #ifdef PNG_WRITE_SHIFT_SUPPORTED 1292 PNG_INTERNAL_FUNCTION(void,png_do_shift,(png_row_infop row_info, 1293 png_bytep row, png_const_color_8p bit_depth),PNG_EMPTY); 1294 #endif 1295 1296 #if defined(PNG_READ_BACKGROUND_SUPPORTED) ||\ 1297 defined(PNG_READ_ALPHA_MODE_SUPPORTED) 1298 PNG_INTERNAL_FUNCTION(void,png_do_compose,(png_row_infop row_info, 1299 png_bytep row, png_structrp png_ptr),PNG_EMPTY); 1300 #endif 1301 1302 #ifdef PNG_READ_GAMMA_SUPPORTED 1303 PNG_INTERNAL_FUNCTION(void,png_do_gamma,(png_row_infop row_info, 1304 png_bytep row, png_structrp png_ptr),PNG_EMPTY); 1305 #endif 1306 1307 #ifdef PNG_READ_ALPHA_MODE_SUPPORTED 1308 PNG_INTERNAL_FUNCTION(void,png_do_encode_alpha,(png_row_infop row_info, 1309 png_bytep row, png_structrp png_ptr),PNG_EMPTY); 1310 #endif 1311 1312 #ifdef PNG_READ_EXPAND_SUPPORTED 1313 PNG_INTERNAL_FUNCTION(void,png_do_expand_palette,(png_row_infop row_info, 1314 png_bytep row, png_const_colorp palette, png_const_bytep trans, 1315 int num_trans),PNG_EMPTY); 1316 PNG_INTERNAL_FUNCTION(void,png_do_expand,(png_row_infop row_info, 1317 png_bytep row, png_const_color_16p trans_color),PNG_EMPTY); 1318 #endif 1319 1320 #ifdef PNG_READ_EXPAND_16_SUPPORTED 1321 PNG_INTERNAL_FUNCTION(void,png_do_expand_16,(png_row_infop row_info, 1322 png_bytep row),PNG_EMPTY); 1323 #endif 1324 1325 /* The following decodes the appropriate chunks, and does error correction, 1326 * then calls the appropriate callback for the chunk if it is valid. 1327 */ 1328 1329 /* Decode the IHDR chunk */ 1330 PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr, 1331 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1332 PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr, 1333 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1334 PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr, 1335 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1336 1337 #ifdef PNG_READ_bKGD_SUPPORTED 1338 PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr, 1339 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1340 #endif 1341 1342 #ifdef PNG_READ_cHRM_SUPPORTED 1343 PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr, 1344 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1345 #endif 1346 1347 #ifdef PNG_READ_gAMA_SUPPORTED 1348 PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr, 1349 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1350 #endif 1351 1352 #ifdef PNG_READ_hIST_SUPPORTED 1353 PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr, 1354 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1355 #endif 1356 1357 #ifdef PNG_READ_iCCP_SUPPORTED 1358 PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr, 1359 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1360 #endif /* PNG_READ_iCCP_SUPPORTED */ 1361 1362 #ifdef PNG_READ_iTXt_SUPPORTED 1363 PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr, 1364 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1365 #endif 1366 1367 #ifdef PNG_READ_oFFs_SUPPORTED 1368 PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr, 1369 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1370 #endif 1371 1372 #ifdef PNG_READ_pCAL_SUPPORTED 1373 PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr, 1374 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1375 #endif 1376 1377 #ifdef PNG_READ_pHYs_SUPPORTED 1378 PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr, 1379 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1380 #endif 1381 1382 #ifdef PNG_READ_sBIT_SUPPORTED 1383 PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr, 1384 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1385 #endif 1386 1387 #ifdef PNG_READ_sCAL_SUPPORTED 1388 PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr, 1389 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1390 #endif 1391 1392 #ifdef PNG_READ_sPLT_SUPPORTED 1393 PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr, 1394 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1395 #endif /* PNG_READ_sPLT_SUPPORTED */ 1396 1397 #ifdef PNG_READ_sRGB_SUPPORTED 1398 PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr, 1399 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1400 #endif 1401 1402 #ifdef PNG_READ_tEXt_SUPPORTED 1403 PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr, 1404 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1405 #endif 1406 1407 #ifdef PNG_READ_tIME_SUPPORTED 1408 PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr, 1409 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1410 #endif 1411 1412 #ifdef PNG_READ_tRNS_SUPPORTED 1413 PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr, 1414 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1415 #endif 1416 1417 #ifdef PNG_READ_zTXt_SUPPORTED 1418 PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr, 1419 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1420 #endif 1421 1422 PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_structrp png_ptr, 1423 png_uint_32 chunk_name),PNG_EMPTY); 1424 1425 #ifdef PNG_READ_SUPPORTED 1426 PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr, 1427 png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY); 1428 /* This is the function that gets called for unknown chunks. The 'keep' 1429 * argument is either non-zero for a known chunk that has been set to be 1430 * handled as unknown or zero for an unknown chunk. By default the function 1431 * just skips the chunk or errors out if it is critical. 1432 */ 1433 1434 #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED 1435 #ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED 1436 PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling, 1437 (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY); 1438 /* Exactly as the API png_handle_as_unknown() except that the argument is a 1439 * 32-bit chunk name, not a string. 1440 */ 1441 #endif 1442 #endif /* PNG_READ_UNKNOWN_CHUNKS_SUPPORTED */ 1443 #endif /* PNG_READ_SUPPORTED */ 1444 1445 /* Handle the transformations for reading and writing */ 1446 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1447 PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr, 1448 png_row_infop row_info),PNG_EMPTY); 1449 #endif 1450 #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED 1451 PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr, 1452 png_row_infop row_info),PNG_EMPTY); 1453 #endif 1454 1455 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1456 PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr), 1457 PNG_EMPTY); 1458 #endif 1459 1460 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1461 PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr, 1462 png_inforp info_ptr),PNG_EMPTY); 1463 PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr, 1464 png_inforp info_ptr),PNG_EMPTY); 1465 PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY); 1466 PNG_INTERNAL_FUNCTION(void,png_push_crc_skip,(png_structrp png_ptr, 1467 png_uint_32 length),PNG_EMPTY); 1468 PNG_INTERNAL_FUNCTION(void,png_push_crc_finish,(png_structrp png_ptr), 1469 PNG_EMPTY); 1470 PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr), 1471 PNG_EMPTY); 1472 PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr, 1473 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); 1474 PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY); 1475 PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr, 1476 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); 1477 PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr), 1478 PNG_EMPTY); 1479 PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr, 1480 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1481 PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr, 1482 png_inforp info_ptr),PNG_EMPTY); 1483 PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr, 1484 png_inforp info_ptr),PNG_EMPTY); 1485 PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr, 1486 png_bytep row),PNG_EMPTY); 1487 PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr, 1488 png_inforp info_ptr),PNG_EMPTY); 1489 PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr, 1490 png_inforp info_ptr),PNG_EMPTY); 1491 PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr), 1492 PNG_EMPTY); 1493 # ifdef PNG_READ_tEXt_SUPPORTED 1494 PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr, 1495 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1496 PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr, 1497 png_inforp info_ptr),PNG_EMPTY); 1498 # endif 1499 # ifdef PNG_READ_zTXt_SUPPORTED 1500 PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr, 1501 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1502 PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr, 1503 png_inforp info_ptr),PNG_EMPTY); 1504 # endif 1505 # ifdef PNG_READ_iTXt_SUPPORTED 1506 PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr, 1507 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1508 PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr, 1509 png_inforp info_ptr),PNG_EMPTY); 1510 # endif 1511 1512 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 1513 1514 #ifdef PNG_MNG_FEATURES_SUPPORTED 1515 PNG_INTERNAL_FUNCTION(void,png_do_read_intrapixel,(png_row_infop row_info, 1516 png_bytep row),PNG_EMPTY); 1517 PNG_INTERNAL_FUNCTION(void,png_do_write_intrapixel,(png_row_infop row_info, 1518 png_bytep row),PNG_EMPTY); 1519 #endif 1520 1521 /* Added at libpng version 1.6.0 */ 1522 #ifdef PNG_GAMMA_SUPPORTED 1523 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr, 1524 png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY); 1525 /* Set the colorspace gamma with a value provided by the application or by 1526 * the gAMA chunk on read. The value will override anything set by an ICC 1527 * profile. 1528 */ 1529 1530 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr, 1531 png_inforp info_ptr), PNG_EMPTY); 1532 /* Synchronize the info 'valid' flags with the colorspace */ 1533 1534 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr, 1535 png_inforp info_ptr), PNG_EMPTY); 1536 /* Copy the png_struct colorspace to the info_struct and call the above to 1537 * synchronize the flags. Checks for NULL info_ptr and does nothing. 1538 */ 1539 #endif 1540 1541 /* Added at libpng version 1.4.0 */ 1542 #ifdef PNG_COLORSPACE_SUPPORTED 1543 /* These internal functions are for maintaining the colorspace structure within 1544 * a png_info or png_struct (or, indeed, both). 1545 */ 1546 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities, 1547 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy, 1548 int preferred), PNG_EMPTY); 1549 1550 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints, 1551 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ, 1552 int preferred), PNG_EMPTY); 1553 1554 #ifdef PNG_sRGB_SUPPORTED 1555 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr, 1556 png_colorspacerp colorspace, int intent), PNG_EMPTY); 1557 /* This does set the colorspace gAMA and cHRM values too, but doesn't set the 1558 * flags to write them, if it returns false there was a problem and an error 1559 * message has already been output (but the colorspace may still need to be 1560 * synced to record the invalid flag). 1561 */ 1562 #endif /* sRGB */ 1563 1564 #ifdef PNG_iCCP_SUPPORTED 1565 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr, 1566 png_colorspacerp colorspace, png_const_charp name, 1567 png_uint_32 profile_length, png_const_bytep profile, int color_type), 1568 PNG_EMPTY); 1569 /* The 'name' is used for information only */ 1570 1571 /* Routines for checking parts of an ICC profile. */ 1572 PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr, 1573 png_colorspacerp colorspace, png_const_charp name, 1574 png_uint_32 profile_length), PNG_EMPTY); 1575 PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr, 1576 png_colorspacerp colorspace, png_const_charp name, 1577 png_uint_32 profile_length, 1578 png_const_bytep profile /* first 132 bytes only */, int color_type), 1579 PNG_EMPTY); 1580 PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr, 1581 png_colorspacerp colorspace, png_const_charp name, 1582 png_uint_32 profile_length, 1583 png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY); 1584 #ifdef PNG_sRGB_SUPPORTED 1585 PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,( 1586 png_const_structrp png_ptr, png_colorspacerp colorspace, 1587 png_const_bytep profile, uLong adler), PNG_EMPTY); 1588 /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may 1589 * be zero to indicate that it is not available. It is used, if provided, 1590 * as a fast check on the profile when checking to see if it is sRGB. 1591 */ 1592 #endif 1593 #endif /* iCCP */ 1594 1595 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1596 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients, 1597 (png_structrp png_ptr), PNG_EMPTY); 1598 /* Set the rgb_to_gray coefficients from the colorspace Y values */ 1599 #endif /* READ_RGB_TO_GRAY */ 1600 #endif /* COLORSPACE */ 1601 1602 /* Added at libpng version 1.4.0 */ 1603 PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr, 1604 png_uint_32 width, png_uint_32 height, int bit_depth, 1605 int color_type, int interlace_type, int compression_type, 1606 int filter_type),PNG_EMPTY); 1607 1608 /* Added at libpng version 1.5.10 */ 1609 #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \ 1610 defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED) 1611 PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes, 1612 (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY); 1613 #endif 1614 1615 #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) 1616 PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr, 1617 png_const_charp name),PNG_NORETURN); 1618 #endif 1619 1620 /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite 1621 * the end. Always leaves the buffer nul terminated. Never errors out (and 1622 * there is no error code.) 1623 */ 1624 PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize, 1625 size_t pos, png_const_charp string),PNG_EMPTY); 1626 1627 /* Various internal functions to handle formatted warning messages, currently 1628 * only implemented for warnings. 1629 */ 1630 #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) 1631 /* Utility to dump an unsigned value into a buffer, given a start pointer and 1632 * and end pointer (which should point just *beyond* the end of the buffer!) 1633 * Returns the pointer to the start of the formatted string. This utility only 1634 * does unsigned values. 1635 */ 1636 PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start, 1637 png_charp end, int format, png_alloc_size_t number),PNG_EMPTY); 1638 1639 /* Convenience macro that takes an array: */ 1640 #define PNG_FORMAT_NUMBER(buffer,format,number) \ 1641 png_format_number(buffer, buffer + (sizeof buffer), format, number) 1642 1643 /* Suggested size for a number buffer (enough for 64 bits and a sign!) */ 1644 #define PNG_NUMBER_BUFFER_SIZE 24 1645 1646 /* These are the integer formats currently supported, the name is formed from 1647 * the standard printf(3) format string. 1648 */ 1649 #define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */ 1650 #define PNG_NUMBER_FORMAT_02u 2 1651 #define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */ 1652 #define PNG_NUMBER_FORMAT_02d 2 1653 #define PNG_NUMBER_FORMAT_x 3 1654 #define PNG_NUMBER_FORMAT_02x 4 1655 #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */ 1656 #endif 1657 1658 #ifdef PNG_WARNINGS_SUPPORTED 1659 /* New defines and members adding in libpng-1.5.4 */ 1660 # define PNG_WARNING_PARAMETER_SIZE 32 1661 # define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */ 1662 1663 /* An l-value of this type has to be passed to the APIs below to cache the 1664 * values of the parameters to a formatted warning message. 1665 */ 1666 typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][ 1667 PNG_WARNING_PARAMETER_SIZE]; 1668 1669 PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p, 1670 int number, png_const_charp string),PNG_EMPTY); 1671 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters, 1672 * including the trailing '\0'. 1673 */ 1674 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned, 1675 (png_warning_parameters p, int number, int format, png_alloc_size_t value), 1676 PNG_EMPTY); 1677 /* Use png_alloc_size_t because it is an unsigned type as big as any we 1678 * need to output. Use the following for a signed value. 1679 */ 1680 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed, 1681 (png_warning_parameters p, int number, int format, png_int_32 value), 1682 PNG_EMPTY); 1683 1684 PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr, 1685 png_warning_parameters p, png_const_charp message),PNG_EMPTY); 1686 /* 'message' follows the X/Open approach of using @1, @2 to insert 1687 * parameters previously supplied using the above functions. Errors in 1688 * specifying the parameters will simply result in garbage substitutions. 1689 */ 1690 #endif 1691 1692 #ifdef PNG_BENIGN_ERRORS_SUPPORTED 1693 /* Application errors (new in 1.6); use these functions (declared below) for 1694 * errors in the parameters or order of API function calls on read. The 1695 * 'warning' should be used for an error that can be handled completely; the 1696 * 'error' for one which can be handled safely but which may lose application 1697 * information or settings. 1698 * 1699 * By default these both result in a png_error call prior to release, while in a 1700 * released version the 'warning' is just a warning. However if the application 1701 * explicitly disables benign errors (explicitly permitting the code to lose 1702 * information) they both turn into warnings. 1703 * 1704 * If benign errors aren't supported they end up as the corresponding base call 1705 * (png_warning or png_error.) 1706 */ 1707 PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr, 1708 png_const_charp message),PNG_EMPTY); 1709 /* The application provided invalid parameters to an API function or called 1710 * an API function at the wrong time, libpng can completely recover. 1711 */ 1712 1713 PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr, 1714 png_const_charp message),PNG_EMPTY); 1715 /* As above but libpng will ignore the call, or attempt some other partial 1716 * recovery from the error. 1717 */ 1718 #else 1719 # define png_app_warning(pp,s) png_warning(pp,s) 1720 # define png_app_error(pp,s) png_error(pp,s) 1721 #endif 1722 1723 PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr, 1724 png_const_charp message, int error),PNG_EMPTY); 1725 /* Report a recoverable issue in chunk data. On read this is used to report 1726 * a problem found while reading a particular chunk and the 1727 * png_chunk_benign_error or png_chunk_warning function is used as 1728 * appropriate. On write this is used to report an error that comes from 1729 * data set via an application call to a png_set_ API and png_app_error or 1730 * png_app_warning is used as appropriate. 1731 * 1732 * The 'error' parameter must have one of the following values: 1733 */ 1734 #define PNG_CHUNK_WARNING 0 /* never an error */ 1735 #define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */ 1736 #define PNG_CHUNK_ERROR 2 /* always an error */ 1737 1738 /* ASCII to FP interfaces, currently only implemented if sCAL 1739 * support is required. 1740 */ 1741 #if defined(PNG_sCAL_SUPPORTED) 1742 /* MAX_DIGITS is actually the maximum number of characters in an sCAL 1743 * width or height, derived from the precision (number of significant 1744 * digits - a build time settable option) and assumptions about the 1745 * maximum ridiculous exponent. 1746 */ 1747 #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/) 1748 1749 #ifdef PNG_FLOATING_POINT_SUPPORTED 1750 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr, 1751 png_charp ascii, png_size_t size, double fp, unsigned int precision), 1752 PNG_EMPTY); 1753 #endif /* FLOATING_POINT */ 1754 1755 #ifdef PNG_FIXED_POINT_SUPPORTED 1756 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr, 1757 png_charp ascii, png_size_t size, png_fixed_point fp),PNG_EMPTY); 1758 #endif /* FIXED_POINT */ 1759 #endif /* sCAL */ 1760 1761 #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) 1762 /* An internal API to validate the format of a floating point number. 1763 * The result is the index of the next character. If the number is 1764 * not valid it will be the index of a character in the supposed number. 1765 * 1766 * The format of a number is defined in the PNG extensions specification 1767 * and this API is strictly conformant to that spec, not anyone elses! 1768 * 1769 * The format as a regular expression is: 1770 * 1771 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)? 1772 * 1773 * or: 1774 * 1775 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)? 1776 * 1777 * The complexity is that either integer or fraction must be present and the 1778 * fraction is permitted to have no digits only if the integer is present. 1779 * 1780 * NOTE: The dangling E problem. 1781 * There is a PNG valid floating point number in the following: 1782 * 1783 * PNG floating point numbers are not greedy. 1784 * 1785 * Working this out requires *TWO* character lookahead (because of the 1786 * sign), the parser does not do this - it will fail at the 'r' - this 1787 * doesn't matter for PNG sCAL chunk values, but it requires more care 1788 * if the value were ever to be embedded in something more complex. Use 1789 * ANSI-C strtod if you need the lookahead. 1790 */ 1791 /* State table for the parser. */ 1792 #define PNG_FP_INTEGER 0 /* before or in integer */ 1793 #define PNG_FP_FRACTION 1 /* before or in fraction */ 1794 #define PNG_FP_EXPONENT 2 /* before or in exponent */ 1795 #define PNG_FP_STATE 3 /* mask for the above */ 1796 #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */ 1797 #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */ 1798 #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */ 1799 #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */ 1800 #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */ 1801 1802 /* These three values don't affect the parser. They are set but not used. 1803 */ 1804 #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */ 1805 #define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */ 1806 #define PNG_FP_NONZERO 256 /* A non-zero value */ 1807 #define PNG_FP_STICKY 448 /* The above three flags */ 1808 1809 /* This is available for the caller to store in 'state' if required. Do not 1810 * call the parser after setting it (the parser sometimes clears it.) 1811 */ 1812 #define PNG_FP_INVALID 512 /* Available for callers as a distinct value */ 1813 1814 /* Result codes for the parser (boolean - true meants ok, false means 1815 * not ok yet.) 1816 */ 1817 #define PNG_FP_MAYBE 0 /* The number may be valid in the future */ 1818 #define PNG_FP_OK 1 /* The number is valid */ 1819 1820 /* Tests on the sticky non-zero and negative flags. To pass these checks 1821 * the state must also indicate that the whole number is valid - this is 1822 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this 1823 * is equivalent to PNG_FP_OK above.) 1824 */ 1825 #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO) 1826 /* NZ_MASK: the string is valid and a non-zero negative value */ 1827 #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO) 1828 /* Z MASK: the string is valid and a non-zero value. */ 1829 /* PNG_FP_SAW_DIGIT: the string is valid. */ 1830 #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT) 1831 #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK) 1832 #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK) 1833 1834 /* The actual parser. This can be called repeatedly. It updates 1835 * the index into the string and the state variable (which must 1836 * be initialized to 0). It returns a result code, as above. There 1837 * is no point calling the parser any more if it fails to advance to 1838 * the end of the string - it is stuck on an invalid character (or 1839 * terminated by '\0'). 1840 * 1841 * Note that the pointer will consume an E or even an E+ and then leave 1842 * a 'maybe' state even though a preceding integer.fraction is valid. 1843 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was 1844 * a valid number. It's possible to recover from this by calling 1845 * the parser again (from the start, with state 0) but with a string 1846 * that omits the last character (i.e. set the size to the index of 1847 * the problem character.) This has not been tested within libpng. 1848 */ 1849 PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string, 1850 png_size_t size, int *statep, png_size_tp whereami),PNG_EMPTY); 1851 1852 /* This is the same but it checks a complete string and returns true 1853 * only if it just contains a floating point number. As of 1.5.4 this 1854 * function also returns the state at the end of parsing the number if 1855 * it was valid (otherwise it returns 0.) This can be used for testing 1856 * for negative or zero values using the sticky flag. 1857 */ 1858 PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string, 1859 png_size_t size),PNG_EMPTY); 1860 #endif /* pCAL || sCAL */ 1861 1862 #if defined(PNG_READ_GAMMA_SUPPORTED) ||\ 1863 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED) 1864 /* Added at libpng version 1.5.0 */ 1865 /* This is a utility to provide a*times/div (rounded) and indicate 1866 * if there is an overflow. The result is a boolean - false (0) 1867 * for overflow, true (1) if no overflow, in which case *res 1868 * holds the result. 1869 */ 1870 PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a, 1871 png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY); 1872 #endif 1873 1874 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED) 1875 /* Same deal, but issue a warning on overflow and return 0. */ 1876 PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn, 1877 (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by, 1878 png_int_32 divided_by),PNG_EMPTY); 1879 #endif 1880 1881 #ifdef PNG_GAMMA_SUPPORTED 1882 /* Calculate a reciprocal - used for gamma values. This returns 1883 * 0 if the argument is 0 in order to maintain an undefined value; 1884 * there are no warnings. 1885 */ 1886 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a), 1887 PNG_EMPTY); 1888 1889 #ifdef PNG_READ_GAMMA_SUPPORTED 1890 /* The same but gives a reciprocal of the product of two fixed point 1891 * values. Accuracy is suitable for gamma calculations but this is 1892 * not exact - use png_muldiv for that. Only required at present on read. 1893 */ 1894 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a, 1895 png_fixed_point b),PNG_EMPTY); 1896 #endif 1897 1898 /* Return true if the gamma value is significantly different from 1.0 */ 1899 PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value), 1900 PNG_EMPTY); 1901 #endif 1902 1903 #ifdef PNG_READ_GAMMA_SUPPORTED 1904 /* Internal fixed point gamma correction. These APIs are called as 1905 * required to convert single values - they don't need to be fast, 1906 * they are not used when processing image pixel values. 1907 * 1908 * While the input is an 'unsigned' value it must actually be the 1909 * correct bit value - 0..255 or 0..65535 as required. 1910 */ 1911 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr, 1912 unsigned int value, png_fixed_point gamma_value),PNG_EMPTY); 1913 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value, 1914 png_fixed_point gamma_value),PNG_EMPTY); 1915 PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value, 1916 png_fixed_point gamma_value),PNG_EMPTY); 1917 PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr), 1918 PNG_EMPTY); 1919 PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr, 1920 int bit_depth),PNG_EMPTY); 1921 #endif 1922 1923 /* SIMPLIFIED READ/WRITE SUPPORT */ 1924 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 1925 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 1926 /* The internal structure that png_image::opaque points to. */ 1927 typedef struct png_control 1928 { 1929 png_structp png_ptr; 1930 png_infop info_ptr; 1931 png_voidp error_buf; /* Always a jmp_buf at present. */ 1932 1933 png_const_bytep memory; /* Memory buffer. */ 1934 png_size_t size; /* Size of the memory buffer. */ 1935 1936 unsigned int for_write :1; /* Otherwise it is a read structure */ 1937 unsigned int owned_file :1; /* We own the file in io_ptr */ 1938 } png_control; 1939 1940 /* Return the pointer to the jmp_buf from a png_control: necessary because C 1941 * does not reveal the type of the elements of jmp_buf. 1942 */ 1943 #ifdef __cplusplus 1944 # define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0]) 1945 #else 1946 # define png_control_jmp_buf(pc) ((pc)->error_buf) 1947 #endif 1948 1949 /* Utility to safely execute a piece of libpng code catching and logging any 1950 * errors that might occur. Returns true on success, false on failure (either 1951 * of the function or as a result of a png_error.) 1952 */ 1953 PNG_INTERNAL_FUNCTION(void,png_safe_error,(png_structp png_ptr, 1954 png_const_charp error_message),PNG_NORETURN); 1955 1956 #ifdef PNG_WARNINGS_SUPPORTED 1957 PNG_INTERNAL_FUNCTION(void,png_safe_warning,(png_structp png_ptr, 1958 png_const_charp warning_message),PNG_EMPTY); 1959 #else 1960 # define png_safe_warning 0/*dummy argument*/ 1961 #endif 1962 1963 PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image, 1964 int (*function)(png_voidp), png_voidp arg),PNG_EMPTY); 1965 1966 /* Utility to log an error; this also cleans up the png_image; the function 1967 * always returns 0 (false). 1968 */ 1969 PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image, 1970 png_const_charp error_message),PNG_EMPTY); 1971 1972 #ifndef PNG_SIMPLIFIED_READ_SUPPORTED 1973 /* png_image_free is used by the write code but not exported */ 1974 PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY); 1975 #endif /* !SIMPLIFIED_READ */ 1976 1977 #endif /* SIMPLIFIED READ/WRITE */ 1978 1979 /* These are initialization functions for hardware specific PNG filter 1980 * optimizations; list these here then select the appropriate one at compile 1981 * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined 1982 * the generic code is used. 1983 */ 1984 #ifdef PNG_FILTER_OPTIMIZATIONS 1985 PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr, 1986 unsigned int bpp), PNG_EMPTY); 1987 /* Just declare the optimization that will be used */ 1988 #else 1989 /* List *all* the possible optimizations here - this branch is required if 1990 * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in 1991 * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing. 1992 */ 1993 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon, 1994 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 1995 #endif 1996 1997 /* Maintainer: Put new private prototypes here ^ */ 1998 1999 #include "pngdebug.h" 2000 2001 #ifdef __cplusplus 2002 } 2003 #endif 2004 2005 #endif /* PNG_VERSION_INFO_ONLY */ 2006 #endif /* PNGPRIV_H */ 2007
