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 /* 111 * pdfium: This version of libpng does not contain the arm neon optimized code 112 * so we should never try to reference it. 113 */ 114 #if 0 115 #ifndef PNG_ARM_NEON_OPT 116 /* ARM NEON optimizations are being controlled by the compiler settings, 117 * typically the target FPU. If the FPU has been set to NEON (-mfpu=neon 118 * with GCC) then the compiler will define __ARM_NEON__ and we can rely 119 * unconditionally on NEON instructions not crashing, otherwise we must 120 * disable use of NEON instructions: 121 */ 122 # ifdef __ARM_NEON__ 123 # define PNG_ARM_NEON_OPT 2 124 # else 125 # define PNG_ARM_NEON_OPT 0 126 # endif 127 #endif 128 129 #if PNG_ARM_NEON_OPT > 0 130 /* NEON optimizations are to be at least considered by libpng, so enable the 131 * callbacks to do this. 132 */ 133 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_neon 134 #endif 135 #endif 136 137 /* Is this a build of a DLL where compilation of the object modules requires 138 * different preprocessor settings to those required for a simple library? If 139 * so PNG_BUILD_DLL must be set. 140 * 141 * If libpng is used inside a DLL but that DLL does not export the libpng APIs 142 * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a 143 * static library of libpng then link the DLL against that. 144 */ 145 #ifndef PNG_BUILD_DLL 146 # ifdef DLL_EXPORT 147 /* This is set by libtool when files are compiled for a DLL; libtool 148 * always compiles twice, even on systems where it isn't necessary. Set 149 * PNG_BUILD_DLL in case it is necessary: 150 */ 151 # define PNG_BUILD_DLL 152 # else 153 # ifdef _WINDLL 154 /* This is set by the Microsoft Visual Studio IDE in projects that 155 * build a DLL. It can't easily be removed from those projects (it 156 * isn't visible in the Visual Studio UI) so it is a fairly reliable 157 * indication that PNG_IMPEXP needs to be set to the DLL export 158 * attributes. 159 */ 160 # define PNG_BUILD_DLL 161 # else 162 # ifdef __DLL__ 163 /* This is set by the Borland C system when compiling for a DLL 164 * (as above.) 165 */ 166 # define PNG_BUILD_DLL 167 # else 168 /* Add additional compiler cases here. */ 169 # endif 170 # endif 171 # endif 172 #endif /* Setting PNG_BUILD_DLL if required */ 173 174 /* See pngconf.h for more details: the builder of the library may set this on 175 * the command line to the right thing for the specific compilation system or it 176 * may be automagically set above (at present we know of no system where it does 177 * need to be set on the command line.) 178 * 179 * PNG_IMPEXP must be set here when building the library to prevent pngconf.h 180 * setting it to the "import" setting for a DLL build. 181 */ 182 #ifndef PNG_IMPEXP 183 # ifdef PNG_BUILD_DLL 184 # define PNG_IMPEXP PNG_DLL_EXPORT 185 # else 186 /* Not building a DLL, or the DLL doesn't require specific export 187 * definitions. 188 */ 189 # define PNG_IMPEXP 190 # endif 191 #endif 192 193 /* No warnings for private or deprecated functions in the build: */ 194 #ifndef PNG_DEPRECATED 195 # define PNG_DEPRECATED 196 #endif 197 #ifndef PNG_PRIVATE 198 # define PNG_PRIVATE 199 #endif 200 201 /* Symbol preprocessing support. 202 * 203 * To enable listing global, but internal, symbols the following macros should 204 * always be used to declare an extern data or function object in this file. 205 */ 206 #ifndef PNG_INTERNAL_DATA 207 # define PNG_INTERNAL_DATA(type, name, array) extern type name array 208 #endif 209 210 #ifndef PNG_INTERNAL_FUNCTION 211 # define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\ 212 extern PNG_FUNCTION(type, name, args, PNG_EMPTY attributes) 213 #endif 214 215 /* If floating or fixed point APIs are disabled they may still be compiled 216 * internally. To handle this make sure they are declared as the appropriate 217 * internal extern function (otherwise the symbol prefixing stuff won't work and 218 * the functions will be used without definitions.) 219 * 220 * NOTE: although all the API functions are declared here they are not all 221 * actually built! Because the declarations are still made it is necessary to 222 * fake out types that they depend on. 223 */ 224 #ifndef PNG_FP_EXPORT 225 # ifndef PNG_FLOATING_POINT_SUPPORTED 226 # define PNG_FP_EXPORT(ordinal, type, name, args)\ 227 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 228 # ifndef PNG_VERSION_INFO_ONLY 229 typedef struct png_incomplete png_double; 230 typedef png_double* png_doublep; 231 typedef const png_double* png_const_doublep; 232 typedef png_double** png_doublepp; 233 # endif 234 # endif 235 #endif 236 #ifndef PNG_FIXED_EXPORT 237 # ifndef PNG_FIXED_POINT_SUPPORTED 238 # define PNG_FIXED_EXPORT(ordinal, type, name, args)\ 239 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 240 # endif 241 #endif 242 243 #include "png.h" 244 245 /* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */ 246 #ifndef PNG_DLL_EXPORT 247 # define PNG_DLL_EXPORT 248 #endif 249 250 /* SECURITY and SAFETY: 251 * 252 * By default libpng is built without any internal limits on image size, 253 * individual heap (png_malloc) allocations or the total amount of memory used. 254 * If PNG_SAFE_LIMITS_SUPPORTED is defined, however, the limits below are used 255 * (unless individually overridden). These limits are believed to be fairly 256 * safe, but builders of secure systems should verify the values against the 257 * real system capabilities. 258 */ 259 #ifdef PNG_SAFE_LIMITS_SUPPORTED 260 /* 'safe' limits */ 261 # ifndef PNG_USER_WIDTH_MAX 262 # define PNG_USER_WIDTH_MAX 1000000 263 # endif 264 # ifndef PNG_USER_HEIGHT_MAX 265 # define PNG_USER_HEIGHT_MAX 1000000 266 # endif 267 # ifndef PNG_USER_CHUNK_CACHE_MAX 268 # define PNG_USER_CHUNK_CACHE_MAX 128 269 # endif 270 # ifndef PNG_USER_CHUNK_MALLOC_MAX 271 # define PNG_USER_CHUNK_MALLOC_MAX 8000000 272 # endif 273 #else 274 /* values for no limits */ 275 # ifndef PNG_USER_WIDTH_MAX 276 # define PNG_USER_WIDTH_MAX 0x7fffffff 277 # endif 278 # ifndef PNG_USER_HEIGHT_MAX 279 # define PNG_USER_HEIGHT_MAX 0x7fffffff 280 # endif 281 # ifndef PNG_USER_CHUNK_CACHE_MAX 282 # define PNG_USER_CHUNK_CACHE_MAX 0 283 # endif 284 # ifndef PNG_USER_CHUNK_MALLOC_MAX 285 # define PNG_USER_CHUNK_MALLOC_MAX 0 286 # endif 287 #endif 288 289 /* Moved to pngpriv.h at libpng-1.5.0 */ 290 /* NOTE: some of these may have been used in external applications as 291 * these definitions were exposed in pngconf.h prior to 1.5. 292 */ 293 294 /* If you are running on a machine where you cannot allocate more 295 * than 64K of memory at once, uncomment this. While libpng will not 296 * normally need that much memory in a chunk (unless you load up a very 297 * large file), zlib needs to know how big of a chunk it can use, and 298 * libpng thus makes sure to check any memory allocation to verify it 299 * will fit into memory. 300 * 301 * zlib provides 'MAXSEG_64K' which, if defined, indicates the 302 * same limit and pngconf.h (already included) sets the limit 303 * if certain operating systems are detected. 304 */ 305 #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K) 306 # define PNG_MAX_MALLOC_64K 307 #endif 308 309 #ifndef PNG_UNUSED 310 /* Unused formal parameter warnings are silenced using the following macro 311 * which is expected to have no bad effects on performance (optimizing 312 * compilers will probably remove it entirely). Note that if you replace 313 * it with something other than whitespace, you must include the terminating 314 * semicolon. 315 */ 316 # define PNG_UNUSED(param) (void)param; 317 #endif 318 319 /* Just a little check that someone hasn't tried to define something 320 * contradictory. 321 */ 322 #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K) 323 # undef PNG_ZBUF_SIZE 324 # define PNG_ZBUF_SIZE 65536L 325 #endif 326 327 /* If warnings or errors are turned off the code is disabled or redirected here. 328 * From 1.5.4 functions have been added to allow very limited formatting of 329 * error and warning messages - this code will also be disabled here. 330 */ 331 #ifdef PNG_WARNINGS_SUPPORTED 332 # define PNG_WARNING_PARAMETERS(p) png_warning_parameters p; 333 #else 334 # define png_warning(s1,s2) ((void)(s1)) 335 # define png_chunk_warning(s1,s2) ((void)(s1)) 336 # define png_warning_parameter(p,number,string) ((void)0) 337 # define png_warning_parameter_unsigned(p,number,format,value) ((void)0) 338 # define png_warning_parameter_signed(p,number,format,value) ((void)0) 339 # define png_formatted_warning(pp,p,message) ((void)(pp)) 340 # define PNG_WARNING_PARAMETERS(p) 341 #endif 342 #ifndef PNG_ERROR_TEXT_SUPPORTED 343 # define png_error(s1,s2) png_err(s1) 344 # define png_chunk_error(s1,s2) png_err(s1) 345 # define png_fixed_error(s1,s2) png_err(s1) 346 #endif 347 348 /* C allows up-casts from (void*) to any pointer and (const void*) to any 349 * pointer to a const object. C++ regards this as a type error and requires an 350 * explicit, static, cast and provides the static_cast<> rune to ensure that 351 * const is not cast away. 352 */ 353 #ifdef __cplusplus 354 # define png_voidcast(type, value) static_cast<type>(value) 355 # define png_constcast(type, value) const_cast<type>(value) 356 # define png_aligncast(type, value) \ 357 static_cast<type>(static_cast<void*>(value)) 358 # define png_aligncastconst(type, value) \ 359 static_cast<type>(static_cast<const void*>(value)) 360 #else 361 # define png_voidcast(type, value) (value) 362 # define png_constcast(type, value) ((type)(value)) 363 # define png_aligncast(type, value) ((void*)(value)) 364 # define png_aligncastconst(type, value) ((const void*)(value)) 365 #endif /* __cplusplus */ 366 367 /* Some fixed point APIs are still required even if not exported because 368 * they get used by the corresponding floating point APIs. This magic 369 * deals with this: 370 */ 371 #ifdef PNG_FIXED_POINT_SUPPORTED 372 # define PNGFAPI PNGAPI 373 #else 374 # define PNGFAPI /* PRIVATE */ 375 #endif 376 377 #ifndef PNG_VERSION_INFO_ONLY 378 /* Other defines specific to compilers can go here. Try to keep 379 * them inside an appropriate ifdef/endif pair for portability. 380 */ 381 #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\ 382 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) 383 /* png.c requires the following ANSI-C constants if the conversion of 384 * floating point to ASCII is implemented therein: 385 * 386 * DBL_DIG Maximum number of decimal digits (can be set to any constant) 387 * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value) 388 * DBL_MAX Maximum floating point number (can be set to an arbitrary value) 389 */ 390 # include <float.h> 391 392 # if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \ 393 defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC) 394 /* We need to check that <math.h> hasn't already been included earlier 395 * as it seems it doesn't agree with <fp.h>, yet we should really use 396 * <fp.h> if possible. 397 */ 398 # if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__) 399 # include <fp.h> 400 # endif 401 # else 402 # include <math.h> 403 # endif 404 # if defined(_AMIGA) && defined(__SASC) && defined(_M68881) 405 /* Amiga SAS/C: We must include builtin FPU functions when compiling using 406 * MATH=68881 407 */ 408 # include <m68881.h> 409 # endif 410 #endif 411 412 /* This provides the non-ANSI (far) memory allocation routines. */ 413 #if defined(__TURBOC__) && defined(__MSDOS__) 414 # include <mem.h> 415 # include <alloc.h> 416 #endif 417 418 #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \ 419 defined(_WIN32) || defined(__WIN32__) 420 # include <windows.h> /* defines _WINDOWS_ macro */ 421 #endif 422 #endif /* PNG_VERSION_INFO_ONLY */ 423 424 /* Moved here around 1.5.0beta36 from pngconf.h */ 425 /* Users may want to use these so they are not private. Any library 426 * functions that are passed far data must be model-independent. 427 */ 428 429 /* Memory model/platform independent fns */ 430 #ifndef PNG_ABORT 431 # ifdef _WINDOWS_ 432 # define PNG_ABORT() ExitProcess(0) 433 # else 434 # define PNG_ABORT() abort() 435 # endif 436 #endif 437 438 /* These macros may need to be architecture dependent. */ 439 #define PNG_ALIGN_NONE 0 /* do not use data alignment */ 440 #define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */ 441 #ifdef offsetof 442 # define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */ 443 #else 444 # define PNG_ALIGN_OFFSET -1 /* prevent the use of this */ 445 #endif 446 #define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */ 447 448 #ifndef PNG_ALIGN_TYPE 449 /* Default to using aligned access optimizations and requiring alignment to a 450 * multiple of the data type size. Override in a compiler specific fashion 451 * if necessary by inserting tests here: 452 */ 453 # define PNG_ALIGN_TYPE PNG_ALIGN_SIZE 454 #endif 455 456 #if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE 457 /* This is used because in some compiler implementations non-aligned 458 * structure members are supported, so the offsetof approach below fails. 459 * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access 460 * is good for performance. Do not do this unless you have tested the result 461 * and understand it. 462 */ 463 # define png_alignof(type) (sizeof (type)) 464 #else 465 # if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET 466 # define png_alignof(type) offsetof(struct{char c; type t;}, t) 467 # else 468 # if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS 469 # define png_alignof(type) (1) 470 # endif 471 /* Else leave png_alignof undefined to prevent use thereof */ 472 # endif 473 #endif 474 475 /* This implicitly assumes alignment is always to a power of 2. */ 476 #ifdef png_alignof 477 # define png_isaligned(ptr, type)\ 478 ((((const char*)ptr-(const char*)0) & (png_alignof(type)-1)) == 0) 479 #else 480 # define png_isaligned(ptr, type) 0 481 #endif 482 483 /* End of memory model/platform independent support */ 484 /* End of 1.5.0beta36 move from pngconf.h */ 485 486 /* CONSTANTS and UTILITY MACROS 487 * These are used internally by libpng and not exposed in the API 488 */ 489 490 /* Various modes of operation. Note that after an init, mode is set to 491 * zero automatically when the structure is created. Three of these 492 * are defined in png.h because they need to be visible to applications 493 * that call png_set_unknown_chunk(). 494 */ 495 /* #define PNG_HAVE_IHDR 0x01 (defined in png.h) */ 496 /* #define PNG_HAVE_PLTE 0x02 (defined in png.h) */ 497 #define PNG_HAVE_IDAT 0x04 498 /* #define PNG_AFTER_IDAT 0x08 (defined in png.h) */ 499 #define PNG_HAVE_IEND 0x10 500 /* 0x20 (unused) */ 501 /* 0x40 (unused) */ 502 /* 0x80 (unused) */ 503 #define PNG_HAVE_CHUNK_HEADER 0x100 504 #define PNG_WROTE_tIME 0x200 505 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400 506 #define PNG_BACKGROUND_IS_GRAY 0x800 507 #define PNG_HAVE_PNG_SIGNATURE 0x1000 508 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ 509 /* 0x4000 (unused) */ 510 #define PNG_IS_READ_STRUCT 0x8000 /* Else is a write struct */ 511 512 /* Flags for the transformations the PNG library does on the image data */ 513 #define PNG_BGR 0x0001 514 #define PNG_INTERLACE 0x0002 515 #define PNG_PACK 0x0004 516 #define PNG_SHIFT 0x0008 517 #define PNG_SWAP_BYTES 0x0010 518 #define PNG_INVERT_MONO 0x0020 519 #define PNG_QUANTIZE 0x0040 520 #define PNG_COMPOSE 0x0080 /* Was PNG_BACKGROUND */ 521 #define PNG_BACKGROUND_EXPAND 0x0100 522 #define PNG_EXPAND_16 0x0200 /* Added to libpng 1.5.2 */ 523 #define PNG_16_TO_8 0x0400 /* Becomes 'chop' in 1.5.4 */ 524 #define PNG_RGBA 0x0800 525 #define PNG_EXPAND 0x1000 526 #define PNG_GAMMA 0x2000 527 #define PNG_GRAY_TO_RGB 0x4000 528 #define PNG_FILLER 0x8000 529 #define PNG_PACKSWAP 0x10000 530 #define PNG_SWAP_ALPHA 0x20000 531 #define PNG_STRIP_ALPHA 0x40000 532 #define PNG_INVERT_ALPHA 0x80000 533 #define PNG_USER_TRANSFORM 0x100000 534 #define PNG_RGB_TO_GRAY_ERR 0x200000 535 #define PNG_RGB_TO_GRAY_WARN 0x400000 536 #define PNG_RGB_TO_GRAY 0x600000 /* two bits, RGB_TO_GRAY_ERR|WARN */ 537 #define PNG_ENCODE_ALPHA 0x800000 /* Added to libpng-1.5.4 */ 538 #define PNG_ADD_ALPHA 0x1000000 /* Added to libpng-1.2.7 */ 539 #define PNG_EXPAND_tRNS 0x2000000 /* Added to libpng-1.2.9 */ 540 #define PNG_SCALE_16_TO_8 0x4000000 /* Added to libpng-1.5.4 */ 541 /* 0x8000000 unused */ 542 /* 0x10000000 unused */ 543 /* 0x20000000 unused */ 544 /* 0x40000000 unused */ 545 /* Flags for png_create_struct */ 546 #define PNG_STRUCT_PNG 0x0001 547 #define PNG_STRUCT_INFO 0x0002 548 549 /* Scaling factor for filter heuristic weighting calculations */ 550 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) 551 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) 552 553 /* Flags for the png_ptr->flags rather than declaring a byte for each one */ 554 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 555 #define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002 /* Added to libpng-1.6.0 */ 556 /* 0x0004 unused */ 557 #define PNG_FLAG_ZSTREAM_ENDED 0x0008 /* Added to libpng-1.6.0 */ 558 /* 0x0010 unused */ 559 /* 0x0020 unused */ 560 #define PNG_FLAG_ROW_INIT 0x0040 561 #define PNG_FLAG_FILLER_AFTER 0x0080 562 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 563 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 564 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 565 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 566 #define PNG_FLAG_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.4 */ 567 #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.4 */ 568 #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.4 */ 569 /* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000 */ 570 /* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000 */ 571 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000 572 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000 573 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000 574 #define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000 /* Added to libpng-1.4.0 */ 575 #define PNG_FLAG_APP_WARNINGS_WARN 0x200000 /* Added to libpng-1.6.0 */ 576 #define PNG_FLAG_APP_ERRORS_WARN 0x400000 /* Added to libpng-1.6.0 */ 577 /* 0x800000 unused */ 578 /* 0x1000000 unused */ 579 /* 0x2000000 unused */ 580 /* 0x4000000 unused */ 581 /* 0x8000000 unused */ 582 /* 0x10000000 unused */ 583 /* 0x20000000 unused */ 584 /* 0x40000000 unused */ 585 586 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 587 PNG_FLAG_CRC_ANCILLARY_NOWARN) 588 589 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 590 PNG_FLAG_CRC_CRITICAL_IGNORE) 591 592 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 593 PNG_FLAG_CRC_CRITICAL_MASK) 594 595 /* Save typing and make code easier to understand */ 596 597 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 598 abs((int)((c1).green) - (int)((c2).green)) + \ 599 abs((int)((c1).blue) - (int)((c2).blue))) 600 601 /* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255 602 * by dividing by 257 *with rounding*. This macro is exact for the given range. 603 * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the 604 * macro were established by experiment (modifying the added value). The macro 605 * has a second variant that takes a value already scaled by 255 and divides by 606 * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it 607 * only gives off-by-one errors and only for 0.5% (1 in 200) of the values. 608 */ 609 #define PNG_DIV65535(v24) (((v24) + 32895) >> 16) 610 #define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255) 611 612 /* Added to libpng-1.2.6 JB */ 613 #define PNG_ROWBYTES(pixel_bits, width) \ 614 ((pixel_bits) >= 8 ? \ 615 ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \ 616 (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) ) 617 618 /* PNG_OUT_OF_RANGE returns true if value is outside the range 619 * ideal-delta..ideal+delta. Each argument is evaluated twice. 620 * "ideal" and "delta" should be constants, normally simple 621 * integers, "value" a variable. Added to libpng-1.2.6 JB 622 */ 623 #define PNG_OUT_OF_RANGE(value, ideal, delta) \ 624 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 625 626 /* Conversions between fixed and floating point, only defined if 627 * required (to make sure the code doesn't accidentally use float 628 * when it is supposedly disabled.) 629 */ 630 #ifdef PNG_FLOATING_POINT_SUPPORTED 631 /* The floating point conversion can't overflow, though it can and 632 * does lose accuracy relative to the original fixed point value. 633 * In practice this doesn't matter because png_fixed_point only 634 * stores numbers with very low precision. The png_ptr and s 635 * arguments are unused by default but are there in case error 636 * checking becomes a requirement. 637 */ 638 #define png_float(png_ptr, fixed, s) (.00001 * (fixed)) 639 640 /* The fixed point conversion performs range checking and evaluates 641 * its argument multiple times, so must be used with care. The 642 * range checking uses the PNG specification values for a signed 643 * 32 bit fixed point value except that the values are deliberately 644 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly 645 * (2^31-1) * 100000). 's' is a string that describes the value being 646 * converted. 647 * 648 * NOTE: this macro will raise a png_error if the range check fails, 649 * therefore it is normally only appropriate to use this on values 650 * that come from API calls or other sources where an out of range 651 * error indicates a programming error, not a data error! 652 * 653 * NOTE: by default this is off - the macro is not used - because the 654 * function call saves a lot of code. 655 */ 656 #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED 657 #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\ 658 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0)) 659 #endif 660 /* else the corresponding function is defined below, inside the scope of the 661 * cplusplus test. 662 */ 663 #endif 664 665 /* Constants for known chunk types. If you need to add a chunk, define the name 666 * here. For historical reasons these constants have the form png_<name>; i.e. 667 * the prefix is lower case. Please use decimal values as the parameters to 668 * match the ISO PNG specification and to avoid relying on the C locale 669 * interpretation of character values. 670 * 671 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values 672 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string 673 * to be generated if required. 674 * 675 * PNG_32b correctly produces a value shifted by up to 24 bits, even on 676 * architectures where (int) is only 16 bits. 677 */ 678 #define PNG_32b(b,s) ((png_uint_32)(b) << (s)) 679 #define PNG_U32(b1,b2,b3,b4) \ 680 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0)) 681 682 /* Constants for known chunk types. 683 * 684 * MAINTAINERS: If you need to add a chunk, define the name here. 685 * For historical reasons these constants have the form png_<name>; i.e. 686 * the prefix is lower case. Please use decimal values as the parameters to 687 * match the ISO PNG specification and to avoid relying on the C locale 688 * interpretation of character values. Please keep the list sorted. 689 * 690 * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk 691 * type. In fact the specification does not express chunk types this way, 692 * however using a 32-bit value means that the chunk type can be read from the 693 * stream using exactly the same code as used for a 32-bit unsigned value and 694 * can be examined far more efficiently (using one arithmetic compare). 695 * 696 * Prior to 1.5.6 the chunk type constants were expressed as C strings. The 697 * libpng API still uses strings for 'unknown' chunks and a macro, 698 * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice 699 * that for portable code numeric values must still be used; the string "IHDR" 700 * is not portable and neither is PNG_U32('I', 'H', 'D', 'R'). 701 * 702 * In 1.7.0 the definitions will be made public in png.h to avoid having to 703 * duplicate the same definitions in application code. 704 */ 705 #define png_IDAT PNG_U32( 73, 68, 65, 84) 706 #define png_IEND PNG_U32( 73, 69, 78, 68) 707 #define png_IHDR PNG_U32( 73, 72, 68, 82) 708 #define png_PLTE PNG_U32( 80, 76, 84, 69) 709 #define png_bKGD PNG_U32( 98, 75, 71, 68) 710 #define png_cHRM PNG_U32( 99, 72, 82, 77) 711 #define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */ 712 #define png_gAMA PNG_U32(103, 65, 77, 65) 713 #define png_gIFg PNG_U32(103, 73, 70, 103) 714 #define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */ 715 #define png_gIFx PNG_U32(103, 73, 70, 120) 716 #define png_hIST PNG_U32(104, 73, 83, 84) 717 #define png_iCCP PNG_U32(105, 67, 67, 80) 718 #define png_iTXt PNG_U32(105, 84, 88, 116) 719 #define png_oFFs PNG_U32(111, 70, 70, 115) 720 #define png_pCAL PNG_U32(112, 67, 65, 76) 721 #define png_pHYs PNG_U32(112, 72, 89, 115) 722 #define png_sBIT PNG_U32(115, 66, 73, 84) 723 #define png_sCAL PNG_U32(115, 67, 65, 76) 724 #define png_sPLT PNG_U32(115, 80, 76, 84) 725 #define png_sRGB PNG_U32(115, 82, 71, 66) 726 #define png_sTER PNG_U32(115, 84, 69, 82) 727 #define png_tEXt PNG_U32(116, 69, 88, 116) 728 #define png_tIME PNG_U32(116, 73, 77, 69) 729 #define png_tRNS PNG_U32(116, 82, 78, 83) 730 #define png_zTXt PNG_U32(122, 84, 88, 116) 731 732 /* The following will work on (signed char*) strings, whereas the get_uint_32 733 * macro will fail on top-bit-set values because of the sign extension. 734 */ 735 #define PNG_CHUNK_FROM_STRING(s)\ 736 PNG_U32(0xff&(s)[0], 0xff&(s)[1], 0xff&(s)[2], 0xff&(s)[3]) 737 738 /* This uses (char), not (png_byte) to avoid warnings on systems where (char) is 739 * signed and the argument is a (char[]) This macro will fail miserably on 740 * systems where (char) is more than 8 bits. 741 */ 742 #define PNG_STRING_FROM_CHUNK(s,c)\ 743 (void)(((char*)(s))[0]=(char)((c)>>24), ((char*)(s))[1]=(char)((c)>>16),\ 744 ((char*)(s))[2]=(char)((c)>>8), ((char*)(s))[3]=(char)((c))) 745 746 /* Do the same but terminate with a null character. */ 747 #define PNG_CSTRING_FROM_CHUNK(s,c)\ 748 (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0) 749 750 /* Test on flag values as defined in the spec (section 5.4): */ 751 #define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29)) 752 #define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c)) 753 #define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21)) 754 #define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13)) 755 #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5)) 756 757 /* Gamma values (new at libpng-1.5.4): */ 758 #define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */ 759 #define PNG_GAMMA_MAC_INVERSE 65909 760 #define PNG_GAMMA_sRGB_INVERSE 45455 761 762 /* Almost everything below is C specific; the #defines above can be used in 763 * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot. 764 */ 765 #ifndef PNG_VERSION_INFO_ONLY 766 767 #include "pngstruct.h" 768 #include "pnginfo.h" 769 770 /* Validate the include paths - the include path used to generate pnglibconf.h 771 * must match that used in the build, or we must be using pnglibconf.h.prebuilt: 772 */ 773 #if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM 774 # error ZLIB_VERNUM != PNG_ZLIB_VERNUM \ 775 "-I (include path) error: see the notes in pngpriv.h" 776 /* This means that when pnglibconf.h was built the copy of zlib.h that it 777 * used is not the same as the one being used here. Because the build of 778 * libpng makes decisions to use inflateInit2 and inflateReset2 based on the 779 * zlib version number and because this affects handling of certain broken 780 * PNG files the -I directives must match. 781 * 782 * The most likely explanation is that you passed a -I in CFLAGS, this will 783 * not work; all the preprocessor directories and in particular all the -I 784 * directives must be in CPPFLAGS. 785 */ 786 #endif 787 788 /* This is used for 16 bit gamma tables -- only the top level pointers are 789 * const; this could be changed: 790 */ 791 typedef const png_uint_16p * png_const_uint_16pp; 792 793 /* Added to libpng-1.5.7: sRGB conversion tables */ 794 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 795 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 796 #ifdef PNG_SIMPLIFIED_READ_SUPPORTED 797 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]); 798 /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value, 799 * 0..65535. This table gives the closest 16-bit answers (no errors). 800 */ 801 #endif 802 803 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]); 804 PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]); 805 806 #define PNG_sRGB_FROM_LINEAR(linear) ((png_byte)((png_sRGB_base[(linear)>>15] +\ 807 ((((linear)&0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8)) 808 /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB 809 * encoded value with maximum error 0.646365. Note that the input is not a 810 * 16-bit value; it has been multiplied by 255! */ 811 #endif /* PNG_SIMPLIFIED_READ/WRITE */ 812 813 814 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 815 #ifdef __cplusplus 816 extern "C" { 817 #endif /* __cplusplus */ 818 819 /* Internal functions; these are not exported from a DLL however because they 820 * are used within several of the C source files they have to be C extern. 821 * 822 * All of these functions must be declared with PNG_INTERNAL_FUNCTION. 823 */ 824 825 /* Zlib support */ 826 #define PNG_UNEXPECTED_ZLIB_RETURN (-7) 827 PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret), 828 PNG_EMPTY); 829 /* Used by the zlib handling functions to ensure that z_stream::msg is always 830 * set before they return. 831 */ 832 833 #ifdef PNG_WRITE_SUPPORTED 834 PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr, 835 png_compression_bufferp *list),PNG_EMPTY); 836 /* Free the buffer list used by the compressed write code. */ 837 #endif 838 839 #if defined(PNG_FLOATING_POINT_SUPPORTED) && \ 840 !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \ 841 (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \ 842 defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \ 843 defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \ 844 (defined(PNG_sCAL_SUPPORTED) && \ 845 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)) 846 PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr, 847 double fp, png_const_charp text),PNG_EMPTY); 848 #endif 849 850 /* Check the user version string for compatibility, returns false if the version 851 * numbers aren't compatible. 852 */ 853 PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr, 854 png_const_charp user_png_ver),PNG_EMPTY); 855 856 /* Internal base allocator - no messages, NULL on failure to allocate. This 857 * does, however, call the application provided allocator and that could call 858 * png_error (although that would be a bug in the application implementation.) 859 */ 860 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr, 861 png_alloc_size_t size),PNG_ALLOCATED); 862 863 #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\ 864 defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED) 865 /* Internal array allocator, outputs no error or warning messages on failure, 866 * just returns NULL. 867 */ 868 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr, 869 int nelements, size_t element_size),PNG_ALLOCATED); 870 871 /* The same but an existing array is extended by add_elements. This function 872 * also memsets the new elements to 0 and copies the old elements. The old 873 * array is not freed or altered. 874 */ 875 PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr, 876 png_const_voidp array, int old_elements, int add_elements, 877 size_t element_size),PNG_ALLOCATED); 878 #endif /* text, sPLT or unknown chunks */ 879 880 /* Magic to create a struct when there is no struct to call the user supplied 881 * memory allocators. Because error handling has not been set up the memory 882 * handlers can't safely call png_error, but this is an obscure and undocumented 883 * restriction so libpng has to assume that the 'free' handler, at least, might 884 * call png_error. 885 */ 886 PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct, 887 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, 888 png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, 889 png_free_ptr free_fn),PNG_ALLOCATED); 890 891 /* Free memory from internal libpng struct */ 892 PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr), 893 PNG_EMPTY); 894 895 /* Free an allocated jmp_buf (always succeeds) */ 896 PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY); 897 898 /* Function to allocate memory for zlib. PNGAPI is disallowed. */ 899 PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size), 900 PNG_ALLOCATED); 901 902 /* Function to free memory for zlib. PNGAPI is disallowed. */ 903 PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY); 904 905 /* Next four functions are used internally as callbacks. PNGCBAPI is required 906 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to 907 * PNGCBAPI at 1.5.0 908 */ 909 910 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr, 911 png_bytep data, png_size_t length),PNG_EMPTY); 912 913 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 914 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr, 915 png_bytep buffer, png_size_t length),PNG_EMPTY); 916 #endif 917 918 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr, 919 png_bytep data, png_size_t length),PNG_EMPTY); 920 921 #ifdef PNG_WRITE_FLUSH_SUPPORTED 922 # ifdef PNG_STDIO_SUPPORTED 923 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr), 924 PNG_EMPTY); 925 # endif 926 #endif 927 928 /* Reset the CRC variable */ 929 PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY); 930 931 /* Write the "data" buffer to whatever output you are using */ 932 PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr, 933 png_const_bytep data, png_size_t length),PNG_EMPTY); 934 935 /* Read and check the PNG file signature */ 936 PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr, 937 png_inforp info_ptr),PNG_EMPTY); 938 939 /* Read the chunk header (length + type name) */ 940 PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr), 941 PNG_EMPTY); 942 943 /* Read data from whatever input you are using into the "data" buffer */ 944 PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data, 945 png_size_t length),PNG_EMPTY); 946 947 /* Read bytes into buf, and update png_ptr->crc */ 948 PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf, 949 png_uint_32 length),PNG_EMPTY); 950 951 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 952 PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr, 953 png_uint_32 skip),PNG_EMPTY); 954 955 /* Read the CRC from the file and compare it to the libpng calculated CRC */ 956 PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY); 957 958 /* Calculate the CRC over a section of data. Note that we are only 959 * passing a maximum of 64K on systems that have this as a memory limit, 960 * since this is the maximum buffer size we can specify. 961 */ 962 PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr, 963 png_const_bytep ptr, png_size_t length),PNG_EMPTY); 964 965 #ifdef PNG_WRITE_FLUSH_SUPPORTED 966 PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY); 967 #endif 968 969 /* Write various chunks */ 970 971 /* Write the IHDR chunk, and update the png_struct with the necessary 972 * information. 973 */ 974 PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr, 975 png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, 976 int compression_method, int filter_method, int interlace_method),PNG_EMPTY); 977 978 PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr, 979 png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY); 980 981 PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr, 982 png_const_bytep row_data, png_alloc_size_t row_data_length, int flush), 983 PNG_EMPTY); 984 985 PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY); 986 987 #ifdef PNG_WRITE_gAMA_SUPPORTED 988 PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr, 989 png_fixed_point file_gamma),PNG_EMPTY); 990 #endif 991 992 #ifdef PNG_WRITE_sBIT_SUPPORTED 993 PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr, 994 png_const_color_8p sbit, int color_type),PNG_EMPTY); 995 #endif 996 997 #ifdef PNG_WRITE_cHRM_SUPPORTED 998 PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr, 999 const png_xy *xy), PNG_EMPTY); 1000 /* The xy value must have been previously validated */ 1001 #endif 1002 1003 #ifdef PNG_WRITE_sRGB_SUPPORTED 1004 PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr, 1005 int intent),PNG_EMPTY); 1006 #endif 1007 1008 #ifdef PNG_WRITE_iCCP_SUPPORTED 1009 PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr, 1010 png_const_charp name, png_const_bytep profile), PNG_EMPTY); 1011 /* The profile must have been previously validated for correctness, the 1012 * length comes from the first four bytes. Only the base, deflate, 1013 * compression is supported. 1014 */ 1015 #endif 1016 1017 #ifdef PNG_WRITE_sPLT_SUPPORTED 1018 PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr, 1019 png_const_sPLT_tp palette),PNG_EMPTY); 1020 #endif 1021 1022 #ifdef PNG_WRITE_tRNS_SUPPORTED 1023 PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr, 1024 png_const_bytep trans, png_const_color_16p values, int number, 1025 int color_type),PNG_EMPTY); 1026 #endif 1027 1028 #ifdef PNG_WRITE_bKGD_SUPPORTED 1029 PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr, 1030 png_const_color_16p values, int color_type),PNG_EMPTY); 1031 #endif 1032 1033 #ifdef PNG_WRITE_hIST_SUPPORTED 1034 PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr, 1035 png_const_uint_16p hist, int num_hist),PNG_EMPTY); 1036 #endif 1037 1038 /* Chunks that have keywords */ 1039 #ifdef PNG_WRITE_tEXt_SUPPORTED 1040 PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr, 1041 png_const_charp key, png_const_charp text, png_size_t text_len),PNG_EMPTY); 1042 #endif 1043 1044 #ifdef PNG_WRITE_zTXt_SUPPORTED 1045 PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp 1046 key, png_const_charp text, png_size_t text_len, int compression),PNG_EMPTY); 1047 #endif 1048 1049 #ifdef PNG_WRITE_iTXt_SUPPORTED 1050 PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr, 1051 int compression, png_const_charp key, png_const_charp lang, 1052 png_const_charp lang_key, png_const_charp text),PNG_EMPTY); 1053 #endif 1054 1055 #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ 1056 PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr, 1057 png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY); 1058 #endif 1059 1060 #ifdef PNG_WRITE_oFFs_SUPPORTED 1061 PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr, 1062 png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY); 1063 #endif 1064 1065 #ifdef PNG_WRITE_pCAL_SUPPORTED 1066 PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr, 1067 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, 1068 png_const_charp units, png_charpp params),PNG_EMPTY); 1069 #endif 1070 1071 #ifdef PNG_WRITE_pHYs_SUPPORTED 1072 PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr, 1073 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 1074 int unit_type),PNG_EMPTY); 1075 #endif 1076 1077 #ifdef PNG_WRITE_tIME_SUPPORTED 1078 PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr, 1079 png_const_timep mod_time),PNG_EMPTY); 1080 #endif 1081 1082 #ifdef PNG_WRITE_sCAL_SUPPORTED 1083 PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr, 1084 int unit, png_const_charp width, png_const_charp height),PNG_EMPTY); 1085 #endif 1086 1087 /* Called when finished processing a row of data */ 1088 PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr), 1089 PNG_EMPTY); 1090 1091 /* Internal use only. Called before first row of data */ 1092 PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr), 1093 PNG_EMPTY); 1094 1095 /* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an 1096 * array of png_ptr->width pixels. If the image is not interlaced or this 1097 * is the final pass this just does a memcpy, otherwise the "display" flag 1098 * is used to determine whether to copy pixels that are not in the current pass. 1099 * 1100 * Because 'png_do_read_interlace' (below) replicates pixels this allows this 1101 * function to achieve the documented 'blocky' appearance during interlaced read 1102 * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row' 1103 * are not changed if they are not in the current pass, when display is 0. 1104 * 1105 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless. 1106 * 1107 * The API always reads from the png_struct row buffer and always assumes that 1108 * it is full width (png_do_read_interlace has already been called.) 1109 * 1110 * This function is only ever used to write to row buffers provided by the 1111 * caller of the relevant libpng API and the row must have already been 1112 * transformed by the read transformations. 1113 * 1114 * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed 1115 * bitmasks for use within the code, otherwise runtime generated masks are used. 1116 * The default is compile time masks. 1117 */ 1118 #ifndef PNG_USE_COMPILE_TIME_MASKS 1119 # define PNG_USE_COMPILE_TIME_MASKS 1 1120 #endif 1121 PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr, 1122 png_bytep row, int display),PNG_EMPTY); 1123 1124 #ifdef PNG_READ_INTERLACING_SUPPORTED 1125 /* Expand an interlaced row: the 'row_info' describes the pass data that has 1126 * been read in and must correspond to the pixels in 'row', the pixels are 1127 * expanded (moved apart) in 'row' to match the final layout, when doing this 1128 * the pixels are *replicated* to the intervening space. This is essential for 1129 * the correct operation of png_combine_row, above. 1130 */ 1131 PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info, 1132 png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY); 1133 #endif 1134 1135 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 1136 1137 #ifdef PNG_WRITE_INTERLACING_SUPPORTED 1138 /* Grab pixels out of a row for an interlaced pass */ 1139 PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info, 1140 png_bytep row, int pass),PNG_EMPTY); 1141 #endif 1142 1143 /* Unfilter a row: check the filter value before calling this, there is no point 1144 * calling it for PNG_FILTER_VALUE_NONE. 1145 */ 1146 PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop 1147 row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY); 1148 1149 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info, 1150 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1151 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_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_sub4_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_avg3_neon,(png_row_infop 1156 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1157 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop 1158 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1159 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop 1160 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1161 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop 1162 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1163 1164 /* Choose the best filter to use and filter the row data */ 1165 PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr, 1166 png_row_infop row_info),PNG_EMPTY); 1167 1168 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED 1169 PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr, 1170 png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY); 1171 /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer 1172 * is NULL the function checks, instead, for the end of the stream. In this 1173 * case a benign error will be issued if the stream end is not found or if 1174 * extra data has to be consumed. 1175 */ 1176 PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr), 1177 PNG_EMPTY); 1178 /* This cleans up when the IDAT LZ stream does not end when the last image 1179 * byte is read; there is still some pending input. 1180 */ 1181 1182 PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr), 1183 PNG_EMPTY); 1184 /* Finish a row while reading, dealing with interlacing passes, etc. */ 1185 #endif 1186 1187 /* Initialize the row buffers, etc. */ 1188 PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY); 1189 1190 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1191 /* Optional call to update the users info structure */ 1192 PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr, 1193 png_inforp info_ptr),PNG_EMPTY); 1194 #endif 1195 1196 /* These are the functions that do the transformations */ 1197 #ifdef PNG_READ_FILLER_SUPPORTED 1198 PNG_INTERNAL_FUNCTION(void,png_do_read_filler,(png_row_infop row_info, 1199 png_bytep row, png_uint_32 filler, png_uint_32 flags),PNG_EMPTY); 1200 #endif 1201 1202 #ifdef PNG_READ_SWAP_ALPHA_SUPPORTED 1203 PNG_INTERNAL_FUNCTION(void,png_do_read_swap_alpha,(png_row_infop row_info, 1204 png_bytep row),PNG_EMPTY); 1205 #endif 1206 1207 #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED 1208 PNG_INTERNAL_FUNCTION(void,png_do_write_swap_alpha,(png_row_infop row_info, 1209 png_bytep row),PNG_EMPTY); 1210 #endif 1211 1212 #ifdef PNG_READ_INVERT_ALPHA_SUPPORTED 1213 PNG_INTERNAL_FUNCTION(void,png_do_read_invert_alpha,(png_row_infop row_info, 1214 png_bytep row),PNG_EMPTY); 1215 #endif 1216 1217 #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED 1218 PNG_INTERNAL_FUNCTION(void,png_do_write_invert_alpha,(png_row_infop row_info, 1219 png_bytep row),PNG_EMPTY); 1220 #endif 1221 1222 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 1223 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 1224 PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info, 1225 png_bytep row, int at_start),PNG_EMPTY); 1226 #endif 1227 1228 #ifdef PNG_16BIT_SUPPORTED 1229 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 1230 PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info, 1231 png_bytep row),PNG_EMPTY); 1232 #endif 1233 #endif 1234 1235 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ 1236 defined(PNG_WRITE_PACKSWAP_SUPPORTED) 1237 PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info, 1238 png_bytep row),PNG_EMPTY); 1239 #endif 1240 1241 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1242 PNG_INTERNAL_FUNCTION(int,png_do_rgb_to_gray,(png_structrp png_ptr, 1243 png_row_infop row_info, png_bytep row),PNG_EMPTY); 1244 #endif 1245 1246 #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED 1247 PNG_INTERNAL_FUNCTION(void,png_do_gray_to_rgb,(png_row_infop row_info, 1248 png_bytep row),PNG_EMPTY); 1249 #endif 1250 1251 #ifdef PNG_READ_PACK_SUPPORTED 1252 PNG_INTERNAL_FUNCTION(void,png_do_unpack,(png_row_infop row_info, 1253 png_bytep row),PNG_EMPTY); 1254 #endif 1255 1256 #ifdef PNG_READ_SHIFT_SUPPORTED 1257 PNG_INTERNAL_FUNCTION(void,png_do_unshift,(png_row_infop row_info, 1258 png_bytep row, png_const_color_8p sig_bits),PNG_EMPTY); 1259 #endif 1260 1261 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 1262 PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info, 1263 png_bytep row),PNG_EMPTY); 1264 #endif 1265 1266 #ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED 1267 PNG_INTERNAL_FUNCTION(void,png_do_scale_16_to_8,(png_row_infop row_info, 1268 png_bytep row),PNG_EMPTY); 1269 #endif 1270 1271 #ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED 1272 PNG_INTERNAL_FUNCTION(void,png_do_chop,(png_row_infop row_info, 1273 png_bytep row),PNG_EMPTY); 1274 #endif 1275 1276 #ifdef PNG_READ_QUANTIZE_SUPPORTED 1277 PNG_INTERNAL_FUNCTION(void,png_do_quantize,(png_row_infop row_info, 1278 png_bytep row, png_const_bytep palette_lookup, 1279 png_const_bytep quantize_lookup),PNG_EMPTY); 1280 1281 # ifdef PNG_CORRECT_PALETTE_SUPPORTED 1282 PNG_INTERNAL_FUNCTION(void,png_correct_palette,(png_structrp png_ptr, 1283 png_colorp palette, int num_palette),PNG_EMPTY); 1284 # endif 1285 #endif 1286 1287 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1288 PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info, 1289 png_bytep row),PNG_EMPTY); 1290 #endif 1291 1292 #ifdef PNG_WRITE_PACK_SUPPORTED 1293 PNG_INTERNAL_FUNCTION(void,png_do_pack,(png_row_infop row_info, 1294 png_bytep row, png_uint_32 bit_depth),PNG_EMPTY); 1295 #endif 1296 1297 #ifdef PNG_WRITE_SHIFT_SUPPORTED 1298 PNG_INTERNAL_FUNCTION(void,png_do_shift,(png_row_infop row_info, 1299 png_bytep row, png_const_color_8p bit_depth),PNG_EMPTY); 1300 #endif 1301 1302 #if defined(PNG_READ_BACKGROUND_SUPPORTED) ||\ 1303 defined(PNG_READ_ALPHA_MODE_SUPPORTED) 1304 PNG_INTERNAL_FUNCTION(void,png_do_compose,(png_row_infop row_info, 1305 png_bytep row, png_structrp png_ptr),PNG_EMPTY); 1306 #endif 1307 1308 #ifdef PNG_READ_GAMMA_SUPPORTED 1309 PNG_INTERNAL_FUNCTION(void,png_do_gamma,(png_row_infop row_info, 1310 png_bytep row, png_structrp png_ptr),PNG_EMPTY); 1311 #endif 1312 1313 #ifdef PNG_READ_ALPHA_MODE_SUPPORTED 1314 PNG_INTERNAL_FUNCTION(void,png_do_encode_alpha,(png_row_infop row_info, 1315 png_bytep row, png_structrp png_ptr),PNG_EMPTY); 1316 #endif 1317 1318 #ifdef PNG_READ_EXPAND_SUPPORTED 1319 PNG_INTERNAL_FUNCTION(void,png_do_expand_palette,(png_row_infop row_info, 1320 png_bytep row, png_const_colorp palette, png_const_bytep trans, 1321 int num_trans),PNG_EMPTY); 1322 PNG_INTERNAL_FUNCTION(void,png_do_expand,(png_row_infop row_info, 1323 png_bytep row, png_const_color_16p trans_color),PNG_EMPTY); 1324 #endif 1325 1326 #ifdef PNG_READ_EXPAND_16_SUPPORTED 1327 PNG_INTERNAL_FUNCTION(void,png_do_expand_16,(png_row_infop row_info, 1328 png_bytep row),PNG_EMPTY); 1329 #endif 1330 1331 /* The following decodes the appropriate chunks, and does error correction, 1332 * then calls the appropriate callback for the chunk if it is valid. 1333 */ 1334 1335 /* Decode the IHDR chunk */ 1336 PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr, 1337 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1338 PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr, 1339 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1340 PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr, 1341 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1342 1343 #ifdef PNG_READ_bKGD_SUPPORTED 1344 PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr, 1345 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1346 #endif 1347 1348 #ifdef PNG_READ_cHRM_SUPPORTED 1349 PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr, 1350 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1351 #endif 1352 1353 #ifdef PNG_READ_gAMA_SUPPORTED 1354 PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr, 1355 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1356 #endif 1357 1358 #ifdef PNG_READ_hIST_SUPPORTED 1359 PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr, 1360 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1361 #endif 1362 1363 #ifdef PNG_READ_iCCP_SUPPORTED 1364 PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr, 1365 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1366 #endif /* PNG_READ_iCCP_SUPPORTED */ 1367 1368 #ifdef PNG_READ_iTXt_SUPPORTED 1369 PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr, 1370 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1371 #endif 1372 1373 #ifdef PNG_READ_oFFs_SUPPORTED 1374 PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr, 1375 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1376 #endif 1377 1378 #ifdef PNG_READ_pCAL_SUPPORTED 1379 PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr, 1380 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1381 #endif 1382 1383 #ifdef PNG_READ_pHYs_SUPPORTED 1384 PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr, 1385 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1386 #endif 1387 1388 #ifdef PNG_READ_sBIT_SUPPORTED 1389 PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr, 1390 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1391 #endif 1392 1393 #ifdef PNG_READ_sCAL_SUPPORTED 1394 PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr, 1395 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1396 #endif 1397 1398 #ifdef PNG_READ_sPLT_SUPPORTED 1399 PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr, 1400 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1401 #endif /* PNG_READ_sPLT_SUPPORTED */ 1402 1403 #ifdef PNG_READ_sRGB_SUPPORTED 1404 PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr, 1405 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1406 #endif 1407 1408 #ifdef PNG_READ_tEXt_SUPPORTED 1409 PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr, 1410 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1411 #endif 1412 1413 #ifdef PNG_READ_tIME_SUPPORTED 1414 PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr, 1415 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1416 #endif 1417 1418 #ifdef PNG_READ_tRNS_SUPPORTED 1419 PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr, 1420 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1421 #endif 1422 1423 #ifdef PNG_READ_zTXt_SUPPORTED 1424 PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr, 1425 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1426 #endif 1427 1428 PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_structrp png_ptr, 1429 png_uint_32 chunk_name),PNG_EMPTY); 1430 1431 #ifdef PNG_READ_SUPPORTED 1432 PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr, 1433 png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY); 1434 /* This is the function that gets called for unknown chunks. The 'keep' 1435 * argument is either non-zero for a known chunk that has been set to be 1436 * handled as unknown or zero for an unknown chunk. By default the function 1437 * just skips the chunk or errors out if it is critical. 1438 */ 1439 1440 #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED 1441 #ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED 1442 PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling, 1443 (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY); 1444 /* Exactly as the API png_handle_as_unknown() except that the argument is a 1445 * 32-bit chunk name, not a string. 1446 */ 1447 #endif 1448 #endif /* PNG_READ_UNKNOWN_CHUNKS_SUPPORTED */ 1449 #endif /* PNG_READ_SUPPORTED */ 1450 1451 /* Handle the transformations for reading and writing */ 1452 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1453 PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr, 1454 png_row_infop row_info),PNG_EMPTY); 1455 #endif 1456 #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED 1457 PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr, 1458 png_row_infop row_info),PNG_EMPTY); 1459 #endif 1460 1461 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1462 PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr), 1463 PNG_EMPTY); 1464 #endif 1465 1466 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1467 PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr, 1468 png_inforp info_ptr),PNG_EMPTY); 1469 PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr, 1470 png_inforp info_ptr),PNG_EMPTY); 1471 PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY); 1472 PNG_INTERNAL_FUNCTION(void,png_push_crc_skip,(png_structrp png_ptr, 1473 png_uint_32 length),PNG_EMPTY); 1474 PNG_INTERNAL_FUNCTION(void,png_push_crc_finish,(png_structrp png_ptr), 1475 PNG_EMPTY); 1476 PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr), 1477 PNG_EMPTY); 1478 PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr, 1479 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); 1480 PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY); 1481 PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr, 1482 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); 1483 PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr), 1484 PNG_EMPTY); 1485 PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr, 1486 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1487 PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr, 1488 png_inforp info_ptr),PNG_EMPTY); 1489 PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr, 1490 png_inforp info_ptr),PNG_EMPTY); 1491 PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr, 1492 png_bytep row),PNG_EMPTY); 1493 PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr, 1494 png_inforp info_ptr),PNG_EMPTY); 1495 PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr, 1496 png_inforp info_ptr),PNG_EMPTY); 1497 PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr), 1498 PNG_EMPTY); 1499 # ifdef PNG_READ_tEXt_SUPPORTED 1500 PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr, 1501 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1502 PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr, 1503 png_inforp info_ptr),PNG_EMPTY); 1504 # endif 1505 # ifdef PNG_READ_zTXt_SUPPORTED 1506 PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr, 1507 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1508 PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr, 1509 png_inforp info_ptr),PNG_EMPTY); 1510 # endif 1511 # ifdef PNG_READ_iTXt_SUPPORTED 1512 PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr, 1513 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1514 PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr, 1515 png_inforp info_ptr),PNG_EMPTY); 1516 # endif 1517 1518 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 1519 1520 #ifdef PNG_MNG_FEATURES_SUPPORTED 1521 PNG_INTERNAL_FUNCTION(void,png_do_read_intrapixel,(png_row_infop row_info, 1522 png_bytep row),PNG_EMPTY); 1523 PNG_INTERNAL_FUNCTION(void,png_do_write_intrapixel,(png_row_infop row_info, 1524 png_bytep row),PNG_EMPTY); 1525 #endif 1526 1527 /* Added at libpng version 1.6.0 */ 1528 #ifdef PNG_GAMMA_SUPPORTED 1529 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr, 1530 png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY); 1531 /* Set the colorspace gamma with a value provided by the application or by 1532 * the gAMA chunk on read. The value will override anything set by an ICC 1533 * profile. 1534 */ 1535 1536 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr, 1537 png_inforp info_ptr), PNG_EMPTY); 1538 /* Synchronize the info 'valid' flags with the colorspace */ 1539 1540 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr, 1541 png_inforp info_ptr), PNG_EMPTY); 1542 /* Copy the png_struct colorspace to the info_struct and call the above to 1543 * synchronize the flags. Checks for NULL info_ptr and does nothing. 1544 */ 1545 #endif 1546 1547 /* Added at libpng version 1.4.0 */ 1548 #ifdef PNG_COLORSPACE_SUPPORTED 1549 /* These internal functions are for maintaining the colorspace structure within 1550 * a png_info or png_struct (or, indeed, both). 1551 */ 1552 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities, 1553 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy, 1554 int preferred), PNG_EMPTY); 1555 1556 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints, 1557 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ, 1558 int preferred), PNG_EMPTY); 1559 1560 #ifdef PNG_sRGB_SUPPORTED 1561 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr, 1562 png_colorspacerp colorspace, int intent), PNG_EMPTY); 1563 /* This does set the colorspace gAMA and cHRM values too, but doesn't set the 1564 * flags to write them, if it returns false there was a problem and an error 1565 * message has already been output (but the colorspace may still need to be 1566 * synced to record the invalid flag). 1567 */ 1568 #endif /* sRGB */ 1569 1570 #ifdef PNG_iCCP_SUPPORTED 1571 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr, 1572 png_colorspacerp colorspace, png_const_charp name, 1573 png_uint_32 profile_length, png_const_bytep profile, int color_type), 1574 PNG_EMPTY); 1575 /* The 'name' is used for information only */ 1576 1577 /* Routines for checking parts of an ICC profile. */ 1578 PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr, 1579 png_colorspacerp colorspace, png_const_charp name, 1580 png_uint_32 profile_length), PNG_EMPTY); 1581 PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr, 1582 png_colorspacerp colorspace, png_const_charp name, 1583 png_uint_32 profile_length, 1584 png_const_bytep profile /* first 132 bytes only */, int color_type), 1585 PNG_EMPTY); 1586 PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr, 1587 png_colorspacerp colorspace, png_const_charp name, 1588 png_uint_32 profile_length, 1589 png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY); 1590 #ifdef PNG_sRGB_SUPPORTED 1591 PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,( 1592 png_const_structrp png_ptr, png_colorspacerp colorspace, 1593 png_const_bytep profile, uLong adler), PNG_EMPTY); 1594 /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may 1595 * be zero to indicate that it is not available. It is used, if provided, 1596 * as a fast check on the profile when checking to see if it is sRGB. 1597 */ 1598 #endif 1599 #endif /* iCCP */ 1600 1601 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1602 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients, 1603 (png_structrp png_ptr), PNG_EMPTY); 1604 /* Set the rgb_to_gray coefficients from the colorspace Y values */ 1605 #endif /* READ_RGB_TO_GRAY */ 1606 #endif /* COLORSPACE */ 1607 1608 /* Added at libpng version 1.4.0 */ 1609 PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr, 1610 png_uint_32 width, png_uint_32 height, int bit_depth, 1611 int color_type, int interlace_type, int compression_type, 1612 int filter_type),PNG_EMPTY); 1613 1614 /* Added at libpng version 1.5.10 */ 1615 #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \ 1616 defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED) 1617 PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes, 1618 (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY); 1619 #endif 1620 1621 #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) 1622 PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr, 1623 png_const_charp name),PNG_NORETURN); 1624 #endif 1625 1626 /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite 1627 * the end. Always leaves the buffer nul terminated. Never errors out (and 1628 * there is no error code.) 1629 */ 1630 PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize, 1631 size_t pos, png_const_charp string),PNG_EMPTY); 1632 1633 /* Various internal functions to handle formatted warning messages, currently 1634 * only implemented for warnings. 1635 */ 1636 #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) 1637 /* Utility to dump an unsigned value into a buffer, given a start pointer and 1638 * and end pointer (which should point just *beyond* the end of the buffer!) 1639 * Returns the pointer to the start of the formatted string. This utility only 1640 * does unsigned values. 1641 */ 1642 PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start, 1643 png_charp end, int format, png_alloc_size_t number),PNG_EMPTY); 1644 1645 /* Convenience macro that takes an array: */ 1646 #define PNG_FORMAT_NUMBER(buffer,format,number) \ 1647 png_format_number(buffer, buffer + (sizeof buffer), format, number) 1648 1649 /* Suggested size for a number buffer (enough for 64 bits and a sign!) */ 1650 #define PNG_NUMBER_BUFFER_SIZE 24 1651 1652 /* These are the integer formats currently supported, the name is formed from 1653 * the standard printf(3) format string. 1654 */ 1655 #define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */ 1656 #define PNG_NUMBER_FORMAT_02u 2 1657 #define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */ 1658 #define PNG_NUMBER_FORMAT_02d 2 1659 #define PNG_NUMBER_FORMAT_x 3 1660 #define PNG_NUMBER_FORMAT_02x 4 1661 #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */ 1662 #endif 1663 1664 #ifdef PNG_WARNINGS_SUPPORTED 1665 /* New defines and members adding in libpng-1.5.4 */ 1666 # define PNG_WARNING_PARAMETER_SIZE 32 1667 # define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */ 1668 1669 /* An l-value of this type has to be passed to the APIs below to cache the 1670 * values of the parameters to a formatted warning message. 1671 */ 1672 typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][ 1673 PNG_WARNING_PARAMETER_SIZE]; 1674 1675 PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p, 1676 int number, png_const_charp string),PNG_EMPTY); 1677 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters, 1678 * including the trailing '\0'. 1679 */ 1680 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned, 1681 (png_warning_parameters p, int number, int format, png_alloc_size_t value), 1682 PNG_EMPTY); 1683 /* Use png_alloc_size_t because it is an unsigned type as big as any we 1684 * need to output. Use the following for a signed value. 1685 */ 1686 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed, 1687 (png_warning_parameters p, int number, int format, png_int_32 value), 1688 PNG_EMPTY); 1689 1690 PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr, 1691 png_warning_parameters p, png_const_charp message),PNG_EMPTY); 1692 /* 'message' follows the X/Open approach of using @1, @2 to insert 1693 * parameters previously supplied using the above functions. Errors in 1694 * specifying the parameters will simply result in garbage substitutions. 1695 */ 1696 #endif 1697 1698 #ifdef PNG_BENIGN_ERRORS_SUPPORTED 1699 /* Application errors (new in 1.6); use these functions (declared below) for 1700 * errors in the parameters or order of API function calls on read. The 1701 * 'warning' should be used for an error that can be handled completely; the 1702 * 'error' for one which can be handled safely but which may lose application 1703 * information or settings. 1704 * 1705 * By default these both result in a png_error call prior to release, while in a 1706 * released version the 'warning' is just a warning. However if the application 1707 * explicitly disables benign errors (explicitly permitting the code to lose 1708 * information) they both turn into warnings. 1709 * 1710 * If benign errors aren't supported they end up as the corresponding base call 1711 * (png_warning or png_error.) 1712 */ 1713 PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr, 1714 png_const_charp message),PNG_EMPTY); 1715 /* The application provided invalid parameters to an API function or called 1716 * an API function at the wrong time, libpng can completely recover. 1717 */ 1718 1719 PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr, 1720 png_const_charp message),PNG_EMPTY); 1721 /* As above but libpng will ignore the call, or attempt some other partial 1722 * recovery from the error. 1723 */ 1724 #else 1725 # define png_app_warning(pp,s) png_warning(pp,s) 1726 # define png_app_error(pp,s) png_error(pp,s) 1727 #endif 1728 1729 PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr, 1730 png_const_charp message, int error),PNG_EMPTY); 1731 /* Report a recoverable issue in chunk data. On read this is used to report 1732 * a problem found while reading a particular chunk and the 1733 * png_chunk_benign_error or png_chunk_warning function is used as 1734 * appropriate. On write this is used to report an error that comes from 1735 * data set via an application call to a png_set_ API and png_app_error or 1736 * png_app_warning is used as appropriate. 1737 * 1738 * The 'error' parameter must have one of the following values: 1739 */ 1740 #define PNG_CHUNK_WARNING 0 /* never an error */ 1741 #define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */ 1742 #define PNG_CHUNK_ERROR 2 /* always an error */ 1743 1744 /* ASCII to FP interfaces, currently only implemented if sCAL 1745 * support is required. 1746 */ 1747 #if defined(PNG_sCAL_SUPPORTED) 1748 /* MAX_DIGITS is actually the maximum number of characters in an sCAL 1749 * width or height, derived from the precision (number of significant 1750 * digits - a build time settable option) and assumptions about the 1751 * maximum ridiculous exponent. 1752 */ 1753 #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/) 1754 1755 #ifdef PNG_FLOATING_POINT_SUPPORTED 1756 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr, 1757 png_charp ascii, png_size_t size, double fp, unsigned int precision), 1758 PNG_EMPTY); 1759 #endif /* FLOATING_POINT */ 1760 1761 #ifdef PNG_FIXED_POINT_SUPPORTED 1762 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr, 1763 png_charp ascii, png_size_t size, png_fixed_point fp),PNG_EMPTY); 1764 #endif /* FIXED_POINT */ 1765 #endif /* sCAL */ 1766 1767 #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) 1768 /* An internal API to validate the format of a floating point number. 1769 * The result is the index of the next character. If the number is 1770 * not valid it will be the index of a character in the supposed number. 1771 * 1772 * The format of a number is defined in the PNG extensions specification 1773 * and this API is strictly conformant to that spec, not anyone elses! 1774 * 1775 * The format as a regular expression is: 1776 * 1777 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)? 1778 * 1779 * or: 1780 * 1781 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)? 1782 * 1783 * The complexity is that either integer or fraction must be present and the 1784 * fraction is permitted to have no digits only if the integer is present. 1785 * 1786 * NOTE: The dangling E problem. 1787 * There is a PNG valid floating point number in the following: 1788 * 1789 * PNG floating point numbers are not greedy. 1790 * 1791 * Working this out requires *TWO* character lookahead (because of the 1792 * sign), the parser does not do this - it will fail at the 'r' - this 1793 * doesn't matter for PNG sCAL chunk values, but it requires more care 1794 * if the value were ever to be embedded in something more complex. Use 1795 * ANSI-C strtod if you need the lookahead. 1796 */ 1797 /* State table for the parser. */ 1798 #define PNG_FP_INTEGER 0 /* before or in integer */ 1799 #define PNG_FP_FRACTION 1 /* before or in fraction */ 1800 #define PNG_FP_EXPONENT 2 /* before or in exponent */ 1801 #define PNG_FP_STATE 3 /* mask for the above */ 1802 #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */ 1803 #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */ 1804 #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */ 1805 #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */ 1806 #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */ 1807 1808 /* These three values don't affect the parser. They are set but not used. 1809 */ 1810 #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */ 1811 #define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */ 1812 #define PNG_FP_NONZERO 256 /* A non-zero value */ 1813 #define PNG_FP_STICKY 448 /* The above three flags */ 1814 1815 /* This is available for the caller to store in 'state' if required. Do not 1816 * call the parser after setting it (the parser sometimes clears it.) 1817 */ 1818 #define PNG_FP_INVALID 512 /* Available for callers as a distinct value */ 1819 1820 /* Result codes for the parser (boolean - true meants ok, false means 1821 * not ok yet.) 1822 */ 1823 #define PNG_FP_MAYBE 0 /* The number may be valid in the future */ 1824 #define PNG_FP_OK 1 /* The number is valid */ 1825 1826 /* Tests on the sticky non-zero and negative flags. To pass these checks 1827 * the state must also indicate that the whole number is valid - this is 1828 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this 1829 * is equivalent to PNG_FP_OK above.) 1830 */ 1831 #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO) 1832 /* NZ_MASK: the string is valid and a non-zero negative value */ 1833 #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO) 1834 /* Z MASK: the string is valid and a non-zero value. */ 1835 /* PNG_FP_SAW_DIGIT: the string is valid. */ 1836 #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT) 1837 #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK) 1838 #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK) 1839 1840 /* The actual parser. This can be called repeatedly. It updates 1841 * the index into the string and the state variable (which must 1842 * be initialized to 0). It returns a result code, as above. There 1843 * is no point calling the parser any more if it fails to advance to 1844 * the end of the string - it is stuck on an invalid character (or 1845 * terminated by '\0'). 1846 * 1847 * Note that the pointer will consume an E or even an E+ and then leave 1848 * a 'maybe' state even though a preceding integer.fraction is valid. 1849 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was 1850 * a valid number. It's possible to recover from this by calling 1851 * the parser again (from the start, with state 0) but with a string 1852 * that omits the last character (i.e. set the size to the index of 1853 * the problem character.) This has not been tested within libpng. 1854 */ 1855 PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string, 1856 png_size_t size, int *statep, png_size_tp whereami),PNG_EMPTY); 1857 1858 /* This is the same but it checks a complete string and returns true 1859 * only if it just contains a floating point number. As of 1.5.4 this 1860 * function also returns the state at the end of parsing the number if 1861 * it was valid (otherwise it returns 0.) This can be used for testing 1862 * for negative or zero values using the sticky flag. 1863 */ 1864 PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string, 1865 png_size_t size),PNG_EMPTY); 1866 #endif /* pCAL || sCAL */ 1867 1868 #if defined(PNG_READ_GAMMA_SUPPORTED) ||\ 1869 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED) 1870 /* Added at libpng version 1.5.0 */ 1871 /* This is a utility to provide a*times/div (rounded) and indicate 1872 * if there is an overflow. The result is a boolean - false (0) 1873 * for overflow, true (1) if no overflow, in which case *res 1874 * holds the result. 1875 */ 1876 PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a, 1877 png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY); 1878 #endif 1879 1880 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED) 1881 /* Same deal, but issue a warning on overflow and return 0. */ 1882 PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn, 1883 (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by, 1884 png_int_32 divided_by),PNG_EMPTY); 1885 #endif 1886 1887 #ifdef PNG_GAMMA_SUPPORTED 1888 /* Calculate a reciprocal - used for gamma values. This returns 1889 * 0 if the argument is 0 in order to maintain an undefined value; 1890 * there are no warnings. 1891 */ 1892 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a), 1893 PNG_EMPTY); 1894 1895 #ifdef PNG_READ_GAMMA_SUPPORTED 1896 /* The same but gives a reciprocal of the product of two fixed point 1897 * values. Accuracy is suitable for gamma calculations but this is 1898 * not exact - use png_muldiv for that. Only required at present on read. 1899 */ 1900 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a, 1901 png_fixed_point b),PNG_EMPTY); 1902 #endif 1903 1904 /* Return true if the gamma value is significantly different from 1.0 */ 1905 PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value), 1906 PNG_EMPTY); 1907 #endif 1908 1909 #ifdef PNG_READ_GAMMA_SUPPORTED 1910 /* Internal fixed point gamma correction. These APIs are called as 1911 * required to convert single values - they don't need to be fast, 1912 * they are not used when processing image pixel values. 1913 * 1914 * While the input is an 'unsigned' value it must actually be the 1915 * correct bit value - 0..255 or 0..65535 as required. 1916 */ 1917 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr, 1918 unsigned int value, png_fixed_point gamma_value),PNG_EMPTY); 1919 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value, 1920 png_fixed_point gamma_value),PNG_EMPTY); 1921 PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value, 1922 png_fixed_point gamma_value),PNG_EMPTY); 1923 PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr), 1924 PNG_EMPTY); 1925 PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr, 1926 int bit_depth),PNG_EMPTY); 1927 #endif 1928 1929 /* SIMPLIFIED READ/WRITE SUPPORT */ 1930 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 1931 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 1932 /* The internal structure that png_image::opaque points to. */ 1933 typedef struct png_control 1934 { 1935 png_structp png_ptr; 1936 png_infop info_ptr; 1937 png_voidp error_buf; /* Always a jmp_buf at present. */ 1938 1939 png_const_bytep memory; /* Memory buffer. */ 1940 png_size_t size; /* Size of the memory buffer. */ 1941 1942 unsigned int for_write :1; /* Otherwise it is a read structure */ 1943 unsigned int owned_file :1; /* We own the file in io_ptr */ 1944 } png_control; 1945 1946 /* Return the pointer to the jmp_buf from a png_control: necessary because C 1947 * does not reveal the type of the elements of jmp_buf. 1948 */ 1949 #ifdef __cplusplus 1950 # define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0]) 1951 #else 1952 # define png_control_jmp_buf(pc) ((pc)->error_buf) 1953 #endif 1954 1955 /* Utility to safely execute a piece of libpng code catching and logging any 1956 * errors that might occur. Returns true on success, false on failure (either 1957 * of the function or as a result of a png_error.) 1958 */ 1959 PNG_INTERNAL_FUNCTION(void,png_safe_error,(png_structp png_ptr, 1960 png_const_charp error_message),PNG_NORETURN); 1961 1962 #ifdef PNG_WARNINGS_SUPPORTED 1963 PNG_INTERNAL_FUNCTION(void,png_safe_warning,(png_structp png_ptr, 1964 png_const_charp warning_message),PNG_EMPTY); 1965 #else 1966 # define png_safe_warning 0/*dummy argument*/ 1967 #endif 1968 1969 PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image, 1970 int (*function)(png_voidp), png_voidp arg),PNG_EMPTY); 1971 1972 /* Utility to log an error; this also cleans up the png_image; the function 1973 * always returns 0 (false). 1974 */ 1975 PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image, 1976 png_const_charp error_message),PNG_EMPTY); 1977 1978 #ifndef PNG_SIMPLIFIED_READ_SUPPORTED 1979 /* png_image_free is used by the write code but not exported */ 1980 PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY); 1981 #endif /* !SIMPLIFIED_READ */ 1982 1983 #endif /* SIMPLIFIED READ/WRITE */ 1984 1985 /* These are initialization functions for hardware specific PNG filter 1986 * optimizations; list these here then select the appropriate one at compile 1987 * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined 1988 * the generic code is used. 1989 */ 1990 #ifdef PNG_FILTER_OPTIMIZATIONS 1991 PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr, 1992 unsigned int bpp), PNG_EMPTY); 1993 /* Just declare the optimization that will be used */ 1994 #else 1995 /* List *all* the possible optimizations here - this branch is required if 1996 * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in 1997 * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing. 1998 */ 1999 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon, 2000 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 2001 #endif 2002 2003 /* Maintainer: Put new private prototypes here ^ */ 2004 2005 #include "pngdebug.h" 2006 2007 #ifdef __cplusplus 2008 } 2009 #endif 2010 2011 #endif /* PNG_VERSION_INFO_ONLY */ 2012 #endif /* PNGPRIV_H */ 2013