1 /* 2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. Oracle designates this 7 * particular file as subject to the "Classpath" exception as provided 8 * by Oracle in the LICENSE file that accompanied this code. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 */ 24 25 /* pngpriv.h - private declarations for use inside libpng 26 * 27 * This file is available under and governed by the GNU General Public 28 * License version 2 only, as published by the Free Software Foundation. 29 * However, the following notice accompanied the original version of this 30 * file and, per its terms, should not be removed: 31 * 32 * For conditions of distribution and use, see copyright notice in png.h 33 * Copyright (c) 1998-2014 Glenn Randers-Pehrson 34 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) 35 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) 36 * 37 * Last changed in libpng 1.6.10 [March 6, 1014]] 38 * 39 * This code is released under the libpng license. 40 * For conditions of distribution and use, see the disclaimer 41 * and license in png.h 42 */ 43 44 /* The symbols declared in this file (including the functions declared 45 * as extern) are PRIVATE. They are not part of the libpng public 46 * interface, and are not recommended for use by regular applications. 47 * Some of them may become public in the future; others may stay private, 48 * change in an incompatible way, or even disappear. 49 * Although the libpng users are not forbidden to include this header, 50 * they should be well aware of the issues that may arise from doing so. 51 */ 52 53 #ifndef PNGPRIV_H 54 #define PNGPRIV_H 55 56 /* Feature Test Macros. The following are defined here to ensure that correctly 57 * implemented libraries reveal the APIs libpng needs to build and hide those 58 * that are not needed and potentially damaging to the compilation. 59 * 60 * Feature Test Macros must be defined before any system header is included (see 61 * POSIX 1003.1 2.8.2 "POSIX Symbols." 62 * 63 * These macros only have an effect if the operating system supports either 64 * POSIX 1003.1 or C99, or both. On other operating systems (particularly 65 * Windows/Visual Studio) there is no effect; the OS specific tests below are 66 * still required (as of 2011-05-02.) 67 */ 68 #define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */ 69 70 #ifndef PNG_VERSION_INFO_ONLY 71 /* Standard library headers not required by png.h: */ 72 # include <stdlib.h> 73 # include <string.h> 74 #endif 75 76 #define PNGLIB_BUILD /*libpng is being built, not used*/ 77 78 /* If HAVE_CONFIG_H is defined during the build then the build system must 79 * provide an appropriate "config.h" file on the include path. The header file 80 * must provide definitions as required below (search for "HAVE_CONFIG_H"); 81 * see configure.ac for more details of the requirements. The macro 82 * "PNG_NO_CONFIG_H" is provided for maintainers to test for dependencies on 83 * 'configure'; define this macro to prevent the configure build including the 84 * configure generated config.h. Libpng is expected to compile without *any* 85 * special build system support on a reasonably ANSI-C compliant system. 86 */ 87 #if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H) 88 # include <config.h> 89 90 /* Pick up the definition of 'restrict' from config.h if it was read: */ 91 # define PNG_RESTRICT restrict 92 #endif 93 94 /* To support symbol prefixing it is necessary to know *before* including png.h 95 * whether the fixed point (and maybe other) APIs are exported, because if they 96 * are not internal definitions may be required. This is handled below just 97 * before png.h is included, but load the configuration now if it is available. 98 */ 99 #ifndef PNGLCONF_H 100 # include "pnglibconf.h" 101 #endif 102 103 /* Local renames may change non-exported API functions from png.h */ 104 #if defined(PNG_PREFIX) && !defined(PNGPREFIX_H) 105 # include "pngprefix.h" 106 #endif 107 108 #ifdef PNG_USER_CONFIG 109 # include "pngusr.h" 110 /* These should have been defined in pngusr.h */ 111 # ifndef PNG_USER_PRIVATEBUILD 112 # define PNG_USER_PRIVATEBUILD "Custom libpng build" 113 # endif 114 # ifndef PNG_USER_DLLFNAME_POSTFIX 115 # define PNG_USER_DLLFNAME_POSTFIX "Cb" 116 # endif 117 #endif 118 119 /* Compile time options. 120 * ===================== 121 * In a multi-arch build the compiler may compile the code several times for the 122 * same object module, producing different binaries for different architectures. 123 * When this happens configure-time setting of the target host options cannot be 124 * done and this interferes with the handling of the ARM NEON optimizations, and 125 * possibly other similar optimizations. Put additional tests here; in general 126 * this is needed when the same option can be changed at both compile time and 127 * run time depending on the target OS (i.e. iOS vs Android.) 128 * 129 * NOTE: symbol prefixing does not pass $(CFLAGS) to the preprocessor, because 130 * this is not possible with certain compilers (Oracle SUN OS CC), as a result 131 * it is necessary to ensure that all extern functions that *might* be used 132 * regardless of $(CFLAGS) get declared in this file. The test on __ARM_NEON__ 133 * below is one example of this behavior because it is controlled by the 134 * presence or not of -mfpu=neon on the GCC command line, it is possible to do 135 * this in $(CC), e.g. "CC=gcc -mfpu=neon", but people who build libpng rarely 136 * do this. 137 */ 138 #ifndef PNG_ARM_NEON_OPT 139 /* ARM NEON optimizations are being controlled by the compiler settings, 140 * typically the target FPU. If the FPU has been set to NEON (-mfpu=neon 141 * with GCC) then the compiler will define __ARM_NEON__ and we can rely 142 * unconditionally on NEON instructions not crashing, otherwise we must 143 * disable use of NEON instructions. 144 * 145 * NOTE: at present these optimizations depend on 'ALIGNED_MEMORY', so they 146 * can only be turned on automatically if that is supported too. If 147 * PNG_ARM_NEON_OPT is set in CPPFLAGS (to >0) then arm/arm_init.c will fail 148 * to compile with an appropriate #error if ALIGNED_MEMORY has been turned 149 * off. 150 * 151 * Note that gcc-4.9 defines __ARM_NEON instead of __ARM_NEON__, so we 152 * check both variants. 153 */ 154 # if (defined(__ARM_NEON__) || defined(__ARM_NEON)) && \ 155 defined(PNG_ALIGNED_MEMORY_SUPPORTED) 156 # define PNG_ARM_NEON_OPT 2 157 # else 158 # define PNG_ARM_NEON_OPT 0 159 # endif 160 #endif 161 162 #if PNG_ARM_NEON_OPT > 0 163 /* NEON optimizations are to be at least considered by libpng, so enable the 164 * callbacks to do this. 165 */ 166 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_neon 167 168 /* By default the 'intrinsics' code in arm/filter_neon_intrinsics.c is used 169 * if possible - if __ARM_NEON__ is set and the compiler version is not known 170 * to be broken. This is controlled by PNG_ARM_NEON_IMPLEMENTATION which can 171 * be: 172 * 173 * 1 The intrinsics code (the default with __ARM_NEON__) 174 * 2 The hand coded assembler (the default without __ARM_NEON__) 175 * 176 * It is possible to set PNG_ARM_NEON_IMPLEMENTATION in CPPFLAGS, however 177 * this is *NOT* supported and may cease to work even after a minor revision 178 * to libpng. It *is* valid to do this for testing purposes, e.g. speed 179 * testing or a new compiler, but the results should be communicated to the 180 * libpng implementation list for incorporation in the next minor release. 181 */ 182 # ifndef PNG_ARM_NEON_IMPLEMENTATION 183 # if defined(__ARM_NEON__) || defined(__ARM_NEON) 184 # if defined(__clang__) 185 /* At present it is unknown by the libpng developers which versions 186 * of clang support the intrinsics, however some or perhaps all 187 * versions do not work with the assembler so this may be 188 * irrelevant, so just use the default (do nothing here.) 189 */ 190 # elif defined(__GNUC__) 191 /* GCC 4.5.4 NEON support is known to be broken. 4.6.3 is known to 192 * work, so if this *is* GCC, or G++, look for a version >4.5 193 */ 194 # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6) 195 # define PNG_ARM_NEON_IMPLEMENTATION 2 196 # endif /* no GNUC support */ 197 # endif /* __GNUC__ */ 198 # else /* !defined __ARM_NEON__ */ 199 /* The 'intrinsics' code simply won't compile without this -mfpu=neon: 200 */ 201 # define PNG_ARM_NEON_IMPLEMENTATION 2 202 # endif /* __ARM_NEON__ */ 203 # endif /* !PNG_ARM_NEON_IMPLEMENTATION */ 204 205 # ifndef PNG_ARM_NEON_IMPLEMENTATION 206 /* Use the intrinsics code by default. */ 207 # define PNG_ARM_NEON_IMPLEMENTATION 1 208 # endif 209 #endif /* PNG_ARM_NEON_OPT > 0 */ 210 211 /* Is this a build of a DLL where compilation of the object modules requires 212 * different preprocessor settings to those required for a simple library? If 213 * so PNG_BUILD_DLL must be set. 214 * 215 * If libpng is used inside a DLL but that DLL does not export the libpng APIs 216 * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a 217 * static library of libpng then link the DLL against that. 218 */ 219 #ifndef PNG_BUILD_DLL 220 # ifdef DLL_EXPORT 221 /* This is set by libtool when files are compiled for a DLL; libtool 222 * always compiles twice, even on systems where it isn't necessary. Set 223 * PNG_BUILD_DLL in case it is necessary: 224 */ 225 # define PNG_BUILD_DLL 226 # else 227 # ifdef _WINDLL 228 /* This is set by the Microsoft Visual Studio IDE in projects that 229 * build a DLL. It can't easily be removed from those projects (it 230 * isn't visible in the Visual Studio UI) so it is a fairly reliable 231 * indication that PNG_IMPEXP needs to be set to the DLL export 232 * attributes. 233 */ 234 # define PNG_BUILD_DLL 235 # else 236 # ifdef __DLL__ 237 /* This is set by the Borland C system when compiling for a DLL 238 * (as above.) 239 */ 240 # define PNG_BUILD_DLL 241 # else 242 /* Add additional compiler cases here. */ 243 # endif 244 # endif 245 # endif 246 #endif /* Setting PNG_BUILD_DLL if required */ 247 248 /* See pngconf.h for more details: the builder of the library may set this on 249 * the command line to the right thing for the specific compilation system or it 250 * may be automagically set above (at present we know of no system where it does 251 * need to be set on the command line.) 252 * 253 * PNG_IMPEXP must be set here when building the library to prevent pngconf.h 254 * setting it to the "import" setting for a DLL build. 255 */ 256 #ifndef PNG_IMPEXP 257 # ifdef PNG_BUILD_DLL 258 # define PNG_IMPEXP PNG_DLL_EXPORT 259 # else 260 /* Not building a DLL, or the DLL doesn't require specific export 261 * definitions. 262 */ 263 # define PNG_IMPEXP 264 # endif 265 #endif 266 267 /* No warnings for private or deprecated functions in the build: */ 268 #ifndef PNG_DEPRECATED 269 # define PNG_DEPRECATED 270 #endif 271 #ifndef PNG_PRIVATE 272 # define PNG_PRIVATE 273 #endif 274 275 /* Symbol preprocessing support. 276 * 277 * To enable listing global, but internal, symbols the following macros should 278 * always be used to declare an extern data or function object in this file. 279 */ 280 #ifndef PNG_INTERNAL_DATA 281 # define PNG_INTERNAL_DATA(type, name, array) extern type name array 282 #endif 283 284 #ifndef PNG_INTERNAL_FUNCTION 285 # define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\ 286 extern PNG_FUNCTION(type, name, args, PNG_EMPTY attributes) 287 #endif 288 289 #ifndef PNG_INTERNAL_CALLBACK 290 # define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\ 291 extern PNG_FUNCTION(type, (PNGCBAPI name), args, PNG_EMPTY attributes) 292 #endif 293 294 /* If floating or fixed point APIs are disabled they may still be compiled 295 * internally. To handle this make sure they are declared as the appropriate 296 * internal extern function (otherwise the symbol prefixing stuff won't work and 297 * the functions will be used without definitions.) 298 * 299 * NOTE: although all the API functions are declared here they are not all 300 * actually built! Because the declarations are still made it is necessary to 301 * fake out types that they depend on. 302 */ 303 #ifndef PNG_FP_EXPORT 304 # ifndef PNG_FLOATING_POINT_SUPPORTED 305 # define PNG_FP_EXPORT(ordinal, type, name, args)\ 306 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 307 # ifndef PNG_VERSION_INFO_ONLY 308 typedef struct png_incomplete png_double; 309 typedef png_double* png_doublep; 310 typedef const png_double* png_const_doublep; 311 typedef png_double** png_doublepp; 312 # endif 313 # endif 314 #endif 315 #ifndef PNG_FIXED_EXPORT 316 # ifndef PNG_FIXED_POINT_SUPPORTED 317 # define PNG_FIXED_EXPORT(ordinal, type, name, args)\ 318 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 319 # endif 320 #endif 321 322 #include "png.h" 323 324 /* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */ 325 #ifndef PNG_DLL_EXPORT 326 # define PNG_DLL_EXPORT 327 #endif 328 329 /* SECURITY and SAFETY: 330 * 331 * By default libpng is built without any internal limits on image size, 332 * individual heap (png_malloc) allocations or the total amount of memory used. 333 * If PNG_SAFE_LIMITS_SUPPORTED is defined, however, the limits below are used 334 * (unless individually overridden). These limits are believed to be fairly 335 * safe, but builders of secure systems should verify the values against the 336 * real system capabilities. 337 */ 338 #ifdef PNG_SAFE_LIMITS_SUPPORTED 339 /* 'safe' limits */ 340 # ifndef PNG_USER_WIDTH_MAX 341 # define PNG_USER_WIDTH_MAX 1000000 342 # endif 343 # ifndef PNG_USER_HEIGHT_MAX 344 # define PNG_USER_HEIGHT_MAX 1000000 345 # endif 346 # ifndef PNG_USER_CHUNK_CACHE_MAX 347 # define PNG_USER_CHUNK_CACHE_MAX 128 348 # endif 349 # ifndef PNG_USER_CHUNK_MALLOC_MAX 350 # define PNG_USER_CHUNK_MALLOC_MAX 8000000 351 # endif 352 #else 353 /* values for no limits */ 354 # ifndef PNG_USER_WIDTH_MAX 355 # define PNG_USER_WIDTH_MAX 0x7fffffff 356 # endif 357 # ifndef PNG_USER_HEIGHT_MAX 358 # define PNG_USER_HEIGHT_MAX 0x7fffffff 359 # endif 360 # ifndef PNG_USER_CHUNK_CACHE_MAX 361 # define PNG_USER_CHUNK_CACHE_MAX 0 362 # endif 363 # ifndef PNG_USER_CHUNK_MALLOC_MAX 364 # define PNG_USER_CHUNK_MALLOC_MAX 0 365 # endif 366 #endif 367 368 /* Moved to pngpriv.h at libpng-1.5.0 */ 369 /* NOTE: some of these may have been used in external applications as 370 * these definitions were exposed in pngconf.h prior to 1.5. 371 */ 372 373 /* If you are running on a machine where you cannot allocate more 374 * than 64K of memory at once, uncomment this. While libpng will not 375 * normally need that much memory in a chunk (unless you load up a very 376 * large file), zlib needs to know how big of a chunk it can use, and 377 * libpng thus makes sure to check any memory allocation to verify it 378 * will fit into memory. 379 * 380 * zlib provides 'MAXSEG_64K' which, if defined, indicates the 381 * same limit and pngconf.h (already included) sets the limit 382 * if certain operating systems are detected. 383 */ 384 #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K) 385 # define PNG_MAX_MALLOC_64K 386 #endif 387 388 #ifndef PNG_UNUSED 389 /* Unused formal parameter warnings are silenced using the following macro 390 * which is expected to have no bad effects on performance (optimizing 391 * compilers will probably remove it entirely). Note that if you replace 392 * it with something other than whitespace, you must include the terminating 393 * semicolon. 394 */ 395 # define PNG_UNUSED(param) (void)param; 396 #endif 397 398 /* Just a little check that someone hasn't tried to define something 399 * contradictory. 400 */ 401 #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K) 402 # undef PNG_ZBUF_SIZE 403 # define PNG_ZBUF_SIZE 65536L 404 #endif 405 406 /* If warnings or errors are turned off the code is disabled or redirected here. 407 * From 1.5.4 functions have been added to allow very limited formatting of 408 * error and warning messages - this code will also be disabled here. 409 */ 410 #ifdef PNG_WARNINGS_SUPPORTED 411 # define PNG_WARNING_PARAMETERS(p) png_warning_parameters p; 412 #else 413 # define png_warning_parameter(p,number,string) ((void)0) 414 # define png_warning_parameter_unsigned(p,number,format,value) ((void)0) 415 # define png_warning_parameter_signed(p,number,format,value) ((void)0) 416 # define png_formatted_warning(pp,p,message) ((void)(pp)) 417 # define PNG_WARNING_PARAMETERS(p) 418 #endif 419 #ifndef PNG_ERROR_TEXT_SUPPORTED 420 # define png_fixed_error(s1,s2) png_err(s1) 421 #endif 422 423 /* C allows up-casts from (void*) to any pointer and (const void*) to any 424 * pointer to a const object. C++ regards this as a type error and requires an 425 * explicit, static, cast and provides the static_cast<> rune to ensure that 426 * const is not cast away. 427 */ 428 #ifdef __cplusplus 429 # define png_voidcast(type, value) static_cast<type>(value) 430 # define png_constcast(type, value) const_cast<type>(value) 431 # define png_aligncast(type, value) \ 432 static_cast<type>(static_cast<void*>(value)) 433 # define png_aligncastconst(type, value) \ 434 static_cast<type>(static_cast<const void*>(value)) 435 #else 436 # define png_voidcast(type, value) (value) 437 # define png_constcast(type, value) ((type)(value)) 438 # define png_aligncast(type, value) ((void*)(value)) 439 # define png_aligncastconst(type, value) ((const void*)(value)) 440 #endif /* __cplusplus */ 441 442 /* Some fixed point APIs are still required even if not exported because 443 * they get used by the corresponding floating point APIs. This magic 444 * deals with this: 445 */ 446 #ifdef PNG_FIXED_POINT_SUPPORTED 447 # define PNGFAPI PNGAPI 448 #else 449 # define PNGFAPI /* PRIVATE */ 450 #endif 451 452 #ifndef PNG_VERSION_INFO_ONLY 453 /* Other defines specific to compilers can go here. Try to keep 454 * them inside an appropriate ifdef/endif pair for portability. 455 */ 456 #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\ 457 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) 458 /* png.c requires the following ANSI-C constants if the conversion of 459 * floating point to ASCII is implemented therein: 460 * 461 * DBL_DIG Maximum number of decimal digits (can be set to any constant) 462 * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value) 463 * DBL_MAX Maximum floating point number (can be set to an arbitrary value) 464 */ 465 # include <float.h> 466 467 # if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \ 468 defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC) 469 /* We need to check that <math.h> hasn't already been included earlier 470 * as it seems it doesn't agree with <fp.h>, yet we should really use 471 * <fp.h> if possible. 472 */ 473 # if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__) 474 # include <fp.h> 475 # endif 476 # else 477 # include <math.h> 478 # endif 479 # if defined(_AMIGA) && defined(__SASC) && defined(_M68881) 480 /* Amiga SAS/C: We must include builtin FPU functions when compiling using 481 * MATH=68881 482 */ 483 # include <m68881.h> 484 # endif 485 #endif 486 487 /* This provides the non-ANSI (far) memory allocation routines. */ 488 #if defined(__TURBOC__) && defined(__MSDOS__) 489 # include <mem.h> 490 # include <alloc.h> 491 #endif 492 493 #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \ 494 defined(_WIN32) || defined(__WIN32__) 495 # include <windows.h> /* defines _WINDOWS_ macro */ 496 #endif 497 #endif /* PNG_VERSION_INFO_ONLY */ 498 499 /* Moved here around 1.5.0beta36 from pngconf.h */ 500 /* Users may want to use these so they are not private. Any library 501 * functions that are passed far data must be model-independent. 502 */ 503 504 /* Memory model/platform independent fns */ 505 #ifndef PNG_ABORT 506 # ifdef _WINDOWS_ 507 # define PNG_ABORT() ExitProcess(0) 508 # else 509 # define PNG_ABORT() abort() 510 # endif 511 #endif 512 513 /* These macros may need to be architecture dependent. */ 514 #define PNG_ALIGN_NONE 0 /* do not use data alignment */ 515 #define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */ 516 #ifdef offsetof 517 # define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */ 518 #else 519 # define PNG_ALIGN_OFFSET -1 /* prevent the use of this */ 520 #endif 521 #define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */ 522 523 #ifndef PNG_ALIGN_TYPE 524 /* Default to using aligned access optimizations and requiring alignment to a 525 * multiple of the data type size. Override in a compiler specific fashion 526 * if necessary by inserting tests here: 527 */ 528 # define PNG_ALIGN_TYPE PNG_ALIGN_SIZE 529 #endif 530 531 #if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE 532 /* This is used because in some compiler implementations non-aligned 533 * structure members are supported, so the offsetof approach below fails. 534 * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access 535 * is good for performance. Do not do this unless you have tested the result 536 * and understand it. 537 */ 538 # define png_alignof(type) (sizeof (type)) 539 #else 540 # if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET 541 # define png_alignof(type) offsetof(struct{char c; type t;}, t) 542 # else 543 # if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS 544 # define png_alignof(type) (1) 545 # endif 546 /* Else leave png_alignof undefined to prevent use thereof */ 547 # endif 548 #endif 549 550 /* This implicitly assumes alignment is always to a power of 2. */ 551 #ifdef png_alignof 552 # define png_isaligned(ptr, type)\ 553 ((((const char*)ptr-(const char*)0) & (png_alignof(type)-1)) == 0) 554 #else 555 # define png_isaligned(ptr, type) 0 556 #endif 557 558 /* End of memory model/platform independent support */ 559 /* End of 1.5.0beta36 move from pngconf.h */ 560 561 /* CONSTANTS and UTILITY MACROS 562 * These are used internally by libpng and not exposed in the API 563 */ 564 565 /* Various modes of operation. Note that after an init, mode is set to 566 * zero automatically when the structure is created. Three of these 567 * are defined in png.h because they need to be visible to applications 568 * that call png_set_unknown_chunk(). 569 */ 570 /* #define PNG_HAVE_IHDR 0x01 (defined in png.h) */ 571 /* #define PNG_HAVE_PLTE 0x02 (defined in png.h) */ 572 #define PNG_HAVE_IDAT 0x04 573 /* #define PNG_AFTER_IDAT 0x08 (defined in png.h) */ 574 #define PNG_HAVE_IEND 0x10 575 /* 0x20 (unused) */ 576 /* 0x40 (unused) */ 577 /* 0x80 (unused) */ 578 #define PNG_HAVE_CHUNK_HEADER 0x100 579 #define PNG_WROTE_tIME 0x200 580 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400 581 #define PNG_BACKGROUND_IS_GRAY 0x800 582 #define PNG_HAVE_PNG_SIGNATURE 0x1000 583 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ 584 /* 0x4000 (unused) */ 585 #define PNG_IS_READ_STRUCT 0x8000 /* Else is a write struct */ 586 587 /* Flags for the transformations the PNG library does on the image data */ 588 #define PNG_BGR 0x0001 589 #define PNG_INTERLACE 0x0002 590 #define PNG_PACK 0x0004 591 #define PNG_SHIFT 0x0008 592 #define PNG_SWAP_BYTES 0x0010 593 #define PNG_INVERT_MONO 0x0020 594 #define PNG_QUANTIZE 0x0040 595 #define PNG_COMPOSE 0x0080 /* Was PNG_BACKGROUND */ 596 #define PNG_BACKGROUND_EXPAND 0x0100 597 #define PNG_EXPAND_16 0x0200 /* Added to libpng 1.5.2 */ 598 #define PNG_16_TO_8 0x0400 /* Becomes 'chop' in 1.5.4 */ 599 #define PNG_RGBA 0x0800 600 #define PNG_EXPAND 0x1000 601 #define PNG_GAMMA 0x2000 602 #define PNG_GRAY_TO_RGB 0x4000 603 #define PNG_FILLER 0x8000 604 #define PNG_PACKSWAP 0x10000 605 #define PNG_SWAP_ALPHA 0x20000 606 #define PNG_STRIP_ALPHA 0x40000 607 #define PNG_INVERT_ALPHA 0x80000 608 #define PNG_USER_TRANSFORM 0x100000 609 #define PNG_RGB_TO_GRAY_ERR 0x200000 610 #define PNG_RGB_TO_GRAY_WARN 0x400000 611 #define PNG_RGB_TO_GRAY 0x600000 /* two bits, RGB_TO_GRAY_ERR|WARN */ 612 #define PNG_ENCODE_ALPHA 0x800000 /* Added to libpng-1.5.4 */ 613 #define PNG_ADD_ALPHA 0x1000000 /* Added to libpng-1.2.7 */ 614 #define PNG_EXPAND_tRNS 0x2000000 /* Added to libpng-1.2.9 */ 615 #define PNG_SCALE_16_TO_8 0x4000000 /* Added to libpng-1.5.4 */ 616 /* 0x8000000 unused */ 617 /* 0x10000000 unused */ 618 /* 0x20000000 unused */ 619 /* 0x40000000 unused */ 620 /* Flags for png_create_struct */ 621 #define PNG_STRUCT_PNG 0x0001 622 #define PNG_STRUCT_INFO 0x0002 623 624 /* Scaling factor for filter heuristic weighting calculations */ 625 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) 626 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) 627 628 /* Flags for the png_ptr->flags rather than declaring a byte for each one */ 629 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 630 #define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002 /* Added to libpng-1.6.0 */ 631 /* 0x0004 unused */ 632 #define PNG_FLAG_ZSTREAM_ENDED 0x0008 /* Added to libpng-1.6.0 */ 633 /* 0x0010 unused */ 634 /* 0x0020 unused */ 635 #define PNG_FLAG_ROW_INIT 0x0040 636 #define PNG_FLAG_FILLER_AFTER 0x0080 637 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 638 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 639 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 640 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 641 #define PNG_FLAG_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.4 */ 642 #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.4 */ 643 #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.4 */ 644 /* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000 */ 645 /* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000 */ 646 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000 647 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000 648 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000 649 #define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000 /* Added to libpng-1.4.0 */ 650 #define PNG_FLAG_APP_WARNINGS_WARN 0x200000 /* Added to libpng-1.6.0 */ 651 #define PNG_FLAG_APP_ERRORS_WARN 0x400000 /* Added to libpng-1.6.0 */ 652 /* 0x800000 unused */ 653 /* 0x1000000 unused */ 654 /* 0x2000000 unused */ 655 /* 0x4000000 unused */ 656 /* 0x8000000 unused */ 657 /* 0x10000000 unused */ 658 /* 0x20000000 unused */ 659 /* 0x40000000 unused */ 660 661 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 662 PNG_FLAG_CRC_ANCILLARY_NOWARN) 663 664 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 665 PNG_FLAG_CRC_CRITICAL_IGNORE) 666 667 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 668 PNG_FLAG_CRC_CRITICAL_MASK) 669 670 /* Save typing and make code easier to understand */ 671 672 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 673 abs((int)((c1).green) - (int)((c2).green)) + \ 674 abs((int)((c1).blue) - (int)((c2).blue))) 675 676 /* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255 677 * by dividing by 257 *with rounding*. This macro is exact for the given range. 678 * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the 679 * macro were established by experiment (modifying the added value). The macro 680 * has a second variant that takes a value already scaled by 255 and divides by 681 * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it 682 * only gives off-by-one errors and only for 0.5% (1 in 200) of the values. 683 */ 684 #define PNG_DIV65535(v24) (((v24) + 32895) >> 16) 685 #define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255) 686 687 /* Added to libpng-1.2.6 JB */ 688 #define PNG_ROWBYTES(pixel_bits, width) \ 689 ((pixel_bits) >= 8 ? \ 690 ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \ 691 (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) ) 692 693 /* PNG_OUT_OF_RANGE returns true if value is outside the range 694 * ideal-delta..ideal+delta. Each argument is evaluated twice. 695 * "ideal" and "delta" should be constants, normally simple 696 * integers, "value" a variable. Added to libpng-1.2.6 JB 697 */ 698 #define PNG_OUT_OF_RANGE(value, ideal, delta) \ 699 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 700 701 /* Conversions between fixed and floating point, only defined if 702 * required (to make sure the code doesn't accidentally use float 703 * when it is supposedly disabled.) 704 */ 705 #ifdef PNG_FLOATING_POINT_SUPPORTED 706 /* The floating point conversion can't overflow, though it can and 707 * does lose accuracy relative to the original fixed point value. 708 * In practice this doesn't matter because png_fixed_point only 709 * stores numbers with very low precision. The png_ptr and s 710 * arguments are unused by default but are there in case error 711 * checking becomes a requirement. 712 */ 713 #define png_float(png_ptr, fixed, s) (.00001 * (fixed)) 714 715 /* The fixed point conversion performs range checking and evaluates 716 * its argument multiple times, so must be used with care. The 717 * range checking uses the PNG specification values for a signed 718 * 32 bit fixed point value except that the values are deliberately 719 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly 720 * (2^31-1) * 100000). 's' is a string that describes the value being 721 * converted. 722 * 723 * NOTE: this macro will raise a png_error if the range check fails, 724 * therefore it is normally only appropriate to use this on values 725 * that come from API calls or other sources where an out of range 726 * error indicates a programming error, not a data error! 727 * 728 * NOTE: by default this is off - the macro is not used - because the 729 * function call saves a lot of code. 730 */ 731 #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED 732 #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\ 733 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0)) 734 #endif 735 /* else the corresponding function is defined below, inside the scope of the 736 * cplusplus test. 737 */ 738 #endif 739 740 /* Constants for known chunk types. If you need to add a chunk, define the name 741 * here. For historical reasons these constants have the form png_<name>; i.e. 742 * the prefix is lower case. Please use decimal values as the parameters to 743 * match the ISO PNG specification and to avoid relying on the C locale 744 * interpretation of character values. 745 * 746 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values 747 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string 748 * to be generated if required. 749 * 750 * PNG_32b correctly produces a value shifted by up to 24 bits, even on 751 * architectures where (int) is only 16 bits. 752 */ 753 #define PNG_32b(b,s) ((png_uint_32)(b) << (s)) 754 #define PNG_U32(b1,b2,b3,b4) \ 755 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0)) 756 757 /* Constants for known chunk types. 758 * 759 * MAINTAINERS: If you need to add a chunk, define the name here. 760 * For historical reasons these constants have the form png_<name>; i.e. 761 * the prefix is lower case. Please use decimal values as the parameters to 762 * match the ISO PNG specification and to avoid relying on the C locale 763 * interpretation of character values. Please keep the list sorted. 764 * 765 * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk 766 * type. In fact the specification does not express chunk types this way, 767 * however using a 32-bit value means that the chunk type can be read from the 768 * stream using exactly the same code as used for a 32-bit unsigned value and 769 * can be examined far more efficiently (using one arithmetic compare). 770 * 771 * Prior to 1.5.6 the chunk type constants were expressed as C strings. The 772 * libpng API still uses strings for 'unknown' chunks and a macro, 773 * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice 774 * that for portable code numeric values must still be used; the string "IHDR" 775 * is not portable and neither is PNG_U32('I', 'H', 'D', 'R'). 776 * 777 * In 1.7.0 the definitions will be made public in png.h to avoid having to 778 * duplicate the same definitions in application code. 779 */ 780 #define png_IDAT PNG_U32( 73, 68, 65, 84) 781 #define png_IEND PNG_U32( 73, 69, 78, 68) 782 #define png_IHDR PNG_U32( 73, 72, 68, 82) 783 #define png_PLTE PNG_U32( 80, 76, 84, 69) 784 #define png_bKGD PNG_U32( 98, 75, 71, 68) 785 #define png_cHRM PNG_U32( 99, 72, 82, 77) 786 #define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */ 787 #define png_gAMA PNG_U32(103, 65, 77, 65) 788 #define png_gIFg PNG_U32(103, 73, 70, 103) 789 #define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */ 790 #define png_gIFx PNG_U32(103, 73, 70, 120) 791 #define png_hIST PNG_U32(104, 73, 83, 84) 792 #define png_iCCP PNG_U32(105, 67, 67, 80) 793 #define png_iTXt PNG_U32(105, 84, 88, 116) 794 #define png_oFFs PNG_U32(111, 70, 70, 115) 795 #define png_pCAL PNG_U32(112, 67, 65, 76) 796 #define png_pHYs PNG_U32(112, 72, 89, 115) 797 #define png_sBIT PNG_U32(115, 66, 73, 84) 798 #define png_sCAL PNG_U32(115, 67, 65, 76) 799 #define png_sPLT PNG_U32(115, 80, 76, 84) 800 #define png_sRGB PNG_U32(115, 82, 71, 66) 801 #define png_sTER PNG_U32(115, 84, 69, 82) 802 #define png_tEXt PNG_U32(116, 69, 88, 116) 803 #define png_tIME PNG_U32(116, 73, 77, 69) 804 #define png_tRNS PNG_U32(116, 82, 78, 83) 805 #define png_zTXt PNG_U32(122, 84, 88, 116) 806 807 /* The following will work on (signed char*) strings, whereas the get_uint_32 808 * macro will fail on top-bit-set values because of the sign extension. 809 */ 810 #define PNG_CHUNK_FROM_STRING(s)\ 811 PNG_U32(0xff&(s)[0], 0xff&(s)[1], 0xff&(s)[2], 0xff&(s)[3]) 812 813 /* This uses (char), not (png_byte) to avoid warnings on systems where (char) is 814 * signed and the argument is a (char[]) This macro will fail miserably on 815 * systems where (char) is more than 8 bits. 816 */ 817 #define PNG_STRING_FROM_CHUNK(s,c)\ 818 (void)(((char*)(s))[0]=(char)((c)>>24), ((char*)(s))[1]=(char)((c)>>16),\ 819 ((char*)(s))[2]=(char)((c)>>8), ((char*)(s))[3]=(char)((c))) 820 821 /* Do the same but terminate with a null character. */ 822 #define PNG_CSTRING_FROM_CHUNK(s,c)\ 823 (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0) 824 825 /* Test on flag values as defined in the spec (section 5.4): */ 826 #define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29)) 827 #define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c)) 828 #define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21)) 829 #define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13)) 830 #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5)) 831 832 /* Gamma values (new at libpng-1.5.4): */ 833 #define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */ 834 #define PNG_GAMMA_MAC_INVERSE 65909 835 #define PNG_GAMMA_sRGB_INVERSE 45455 836 837 /* Almost everything below is C specific; the #defines above can be used in 838 * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot. 839 */ 840 #ifndef PNG_VERSION_INFO_ONLY 841 842 #include "pngstruct.h" 843 #include "pnginfo.h" 844 845 /* Validate the include paths - the include path used to generate pnglibconf.h 846 * must match that used in the build, or we must be using pnglibconf.h.prebuilt: 847 */ 848 #if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM 849 # error ZLIB_VERNUM != PNG_ZLIB_VERNUM \ 850 "-I (include path) error: see the notes in pngpriv.h" 851 /* This means that when pnglibconf.h was built the copy of zlib.h that it 852 * used is not the same as the one being used here. Because the build of 853 * libpng makes decisions to use inflateInit2 and inflateReset2 based on the 854 * zlib version number and because this affects handling of certain broken 855 * PNG files the -I directives must match. 856 * 857 * The most likely explanation is that you passed a -I in CFLAGS. This will 858 * not work; all the preprocessor directories and in particular all the -I 859 * directives must be in CPPFLAGS. 860 */ 861 #endif 862 863 /* This is used for 16 bit gamma tables -- only the top level pointers are 864 * const; this could be changed: 865 */ 866 typedef const png_uint_16p * png_const_uint_16pp; 867 868 /* Added to libpng-1.5.7: sRGB conversion tables */ 869 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 870 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 871 #ifdef PNG_SIMPLIFIED_READ_SUPPORTED 872 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]); 873 /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value, 874 * 0..65535. This table gives the closest 16-bit answers (no errors). 875 */ 876 #endif 877 878 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]); 879 PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]); 880 881 #define PNG_sRGB_FROM_LINEAR(linear) ((png_byte)((png_sRGB_base[(linear)>>15] +\ 882 ((((linear)&0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8)) 883 /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB 884 * encoded value with maximum error 0.646365. Note that the input is not a 885 * 16-bit value; it has been multiplied by 255! */ 886 #endif /* SIMPLIFIED_READ/WRITE */ 887 888 889 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 890 #ifdef __cplusplus 891 extern "C" { 892 #endif /* __cplusplus */ 893 894 /* Internal functions; these are not exported from a DLL however because they 895 * are used within several of the C source files they have to be C extern. 896 * 897 * All of these functions must be declared with PNG_INTERNAL_FUNCTION. 898 */ 899 900 /* Zlib support */ 901 #define PNG_UNEXPECTED_ZLIB_RETURN (-7) 902 PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret), 903 PNG_EMPTY); 904 /* Used by the zlib handling functions to ensure that z_stream::msg is always 905 * set before they return. 906 */ 907 908 #ifdef PNG_WRITE_SUPPORTED 909 PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr, 910 png_compression_bufferp *list),PNG_EMPTY); 911 /* Free the buffer list used by the compressed write code. */ 912 #endif 913 914 #if defined(PNG_FLOATING_POINT_SUPPORTED) && \ 915 !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \ 916 (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \ 917 defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \ 918 defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \ 919 (defined(PNG_sCAL_SUPPORTED) && \ 920 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)) 921 PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr, 922 double fp, png_const_charp text),PNG_EMPTY); 923 #endif 924 925 /* Check the user version string for compatibility, returns false if the version 926 * numbers aren't compatible. 927 */ 928 PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr, 929 png_const_charp user_png_ver),PNG_EMPTY); 930 931 /* Internal base allocator - no messages, NULL on failure to allocate. This 932 * does, however, call the application provided allocator and that could call 933 * png_error (although that would be a bug in the application implementation.) 934 */ 935 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr, 936 png_alloc_size_t size),PNG_ALLOCATED); 937 938 #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\ 939 defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED) 940 /* Internal array allocator, outputs no error or warning messages on failure, 941 * just returns NULL. 942 */ 943 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr, 944 int nelements, size_t element_size),PNG_ALLOCATED); 945 946 /* The same but an existing array is extended by add_elements. This function 947 * also memsets the new elements to 0 and copies the old elements. The old 948 * array is not freed or altered. 949 */ 950 PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr, 951 png_const_voidp array, int old_elements, int add_elements, 952 size_t element_size),PNG_ALLOCATED); 953 #endif /* text, sPLT or unknown chunks */ 954 955 /* Magic to create a struct when there is no struct to call the user supplied 956 * memory allocators. Because error handling has not been set up the memory 957 * handlers can't safely call png_error, but this is an obscure and undocumented 958 * restriction so libpng has to assume that the 'free' handler, at least, might 959 * call png_error. 960 */ 961 PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct, 962 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, 963 png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, 964 png_free_ptr free_fn),PNG_ALLOCATED); 965 966 /* Free memory from internal libpng struct */ 967 PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr), 968 PNG_EMPTY); 969 970 /* Free an allocated jmp_buf (always succeeds) */ 971 PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY); 972 973 /* Function to allocate memory for zlib. PNGAPI is disallowed. */ 974 PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size), 975 PNG_ALLOCATED); 976 977 /* Function to free memory for zlib. PNGAPI is disallowed. */ 978 PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY); 979 980 /* Next four functions are used internally as callbacks. PNGCBAPI is required 981 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to 982 * PNGCBAPI at 1.5.0 983 */ 984 985 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr, 986 png_bytep data, png_size_t length),PNG_EMPTY); 987 988 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 989 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr, 990 png_bytep buffer, png_size_t length),PNG_EMPTY); 991 #endif 992 993 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr, 994 png_bytep data, png_size_t length),PNG_EMPTY); 995 996 #ifdef PNG_WRITE_FLUSH_SUPPORTED 997 # ifdef PNG_STDIO_SUPPORTED 998 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr), 999 PNG_EMPTY); 1000 # endif 1001 #endif 1002 1003 /* Reset the CRC variable */ 1004 PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY); 1005 1006 /* Write the "data" buffer to whatever output you are using */ 1007 PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr, 1008 png_const_bytep data, png_size_t length),PNG_EMPTY); 1009 1010 /* Read and check the PNG file signature */ 1011 PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr, 1012 png_inforp info_ptr),PNG_EMPTY); 1013 1014 /* Read the chunk header (length + type name) */ 1015 PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr), 1016 PNG_EMPTY); 1017 1018 /* Read data from whatever input you are using into the "data" buffer */ 1019 PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data, 1020 png_size_t length),PNG_EMPTY); 1021 1022 /* Read bytes into buf, and update png_ptr->crc */ 1023 PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf, 1024 png_uint_32 length),PNG_EMPTY); 1025 1026 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 1027 PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr, 1028 png_uint_32 skip),PNG_EMPTY); 1029 1030 /* Read the CRC from the file and compare it to the libpng calculated CRC */ 1031 PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY); 1032 1033 /* Calculate the CRC over a section of data. Note that we are only 1034 * passing a maximum of 64K on systems that have this as a memory limit, 1035 * since this is the maximum buffer size we can specify. 1036 */ 1037 PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr, 1038 png_const_bytep ptr, png_size_t length),PNG_EMPTY); 1039 1040 #ifdef PNG_WRITE_FLUSH_SUPPORTED 1041 PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY); 1042 #endif 1043 1044 /* Write various chunks */ 1045 1046 /* Write the IHDR chunk, and update the png_struct with the necessary 1047 * information. 1048 */ 1049 PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr, 1050 png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, 1051 int compression_method, int filter_method, int interlace_method),PNG_EMPTY); 1052 1053 PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr, 1054 png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY); 1055 1056 PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr, 1057 png_const_bytep row_data, png_alloc_size_t row_data_length, int flush), 1058 PNG_EMPTY); 1059 1060 PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY); 1061 1062 #ifdef PNG_WRITE_gAMA_SUPPORTED 1063 PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr, 1064 png_fixed_point file_gamma),PNG_EMPTY); 1065 #endif 1066 1067 #ifdef PNG_WRITE_sBIT_SUPPORTED 1068 PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr, 1069 png_const_color_8p sbit, int color_type),PNG_EMPTY); 1070 #endif 1071 1072 #ifdef PNG_WRITE_cHRM_SUPPORTED 1073 PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr, 1074 const png_xy *xy), PNG_EMPTY); 1075 /* The xy value must have been previously validated */ 1076 #endif 1077 1078 #ifdef PNG_WRITE_sRGB_SUPPORTED 1079 PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr, 1080 int intent),PNG_EMPTY); 1081 #endif 1082 1083 #ifdef PNG_WRITE_iCCP_SUPPORTED 1084 PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr, 1085 png_const_charp name, png_const_bytep profile), PNG_EMPTY); 1086 /* The profile must have been previously validated for correctness, the 1087 * length comes from the first four bytes. Only the base, deflate, 1088 * compression is supported. 1089 */ 1090 #endif 1091 1092 #ifdef PNG_WRITE_sPLT_SUPPORTED 1093 PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr, 1094 png_const_sPLT_tp palette),PNG_EMPTY); 1095 #endif 1096 1097 #ifdef PNG_WRITE_tRNS_SUPPORTED 1098 PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr, 1099 png_const_bytep trans, png_const_color_16p values, int number, 1100 int color_type),PNG_EMPTY); 1101 #endif 1102 1103 #ifdef PNG_WRITE_bKGD_SUPPORTED 1104 PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr, 1105 png_const_color_16p values, int color_type),PNG_EMPTY); 1106 #endif 1107 1108 #ifdef PNG_WRITE_hIST_SUPPORTED 1109 PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr, 1110 png_const_uint_16p hist, int num_hist),PNG_EMPTY); 1111 #endif 1112 1113 /* Chunks that have keywords */ 1114 #ifdef PNG_WRITE_tEXt_SUPPORTED 1115 PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr, 1116 png_const_charp key, png_const_charp text, png_size_t text_len),PNG_EMPTY); 1117 #endif 1118 1119 #ifdef PNG_WRITE_zTXt_SUPPORTED 1120 PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp 1121 key, png_const_charp text, int compression),PNG_EMPTY); 1122 #endif 1123 1124 #ifdef PNG_WRITE_iTXt_SUPPORTED 1125 PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr, 1126 int compression, png_const_charp key, png_const_charp lang, 1127 png_const_charp lang_key, png_const_charp text),PNG_EMPTY); 1128 #endif 1129 1130 #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ 1131 PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr, 1132 png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY); 1133 #endif 1134 1135 #ifdef PNG_WRITE_oFFs_SUPPORTED 1136 PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr, 1137 png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY); 1138 #endif 1139 1140 #ifdef PNG_WRITE_pCAL_SUPPORTED 1141 PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr, 1142 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, 1143 png_const_charp units, png_charpp params),PNG_EMPTY); 1144 #endif 1145 1146 #ifdef PNG_WRITE_pHYs_SUPPORTED 1147 PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr, 1148 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 1149 int unit_type),PNG_EMPTY); 1150 #endif 1151 1152 #ifdef PNG_WRITE_tIME_SUPPORTED 1153 PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr, 1154 png_const_timep mod_time),PNG_EMPTY); 1155 #endif 1156 1157 #ifdef PNG_WRITE_sCAL_SUPPORTED 1158 PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr, 1159 int unit, png_const_charp width, png_const_charp height),PNG_EMPTY); 1160 #endif 1161 1162 /* Called when finished processing a row of data */ 1163 PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr), 1164 PNG_EMPTY); 1165 1166 /* Internal use only. Called before first row of data */ 1167 PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr), 1168 PNG_EMPTY); 1169 1170 /* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an 1171 * array of png_ptr->width pixels. If the image is not interlaced or this 1172 * is the final pass this just does a memcpy, otherwise the "display" flag 1173 * is used to determine whether to copy pixels that are not in the current pass. 1174 * 1175 * Because 'png_do_read_interlace' (below) replicates pixels this allows this 1176 * function to achieve the documented 'blocky' appearance during interlaced read 1177 * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row' 1178 * are not changed if they are not in the current pass, when display is 0. 1179 * 1180 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless. 1181 * 1182 * The API always reads from the png_struct row buffer and always assumes that 1183 * it is full width (png_do_read_interlace has already been called.) 1184 * 1185 * This function is only ever used to write to row buffers provided by the 1186 * caller of the relevant libpng API and the row must have already been 1187 * transformed by the read transformations. 1188 * 1189 * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed 1190 * bitmasks for use within the code, otherwise runtime generated masks are used. 1191 * The default is compile time masks. 1192 */ 1193 #ifndef PNG_USE_COMPILE_TIME_MASKS 1194 # define PNG_USE_COMPILE_TIME_MASKS 1 1195 #endif 1196 PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr, 1197 png_bytep row, int display),PNG_EMPTY); 1198 1199 #ifdef PNG_READ_INTERLACING_SUPPORTED 1200 /* Expand an interlaced row: the 'row_info' describes the pass data that has 1201 * been read in and must correspond to the pixels in 'row', the pixels are 1202 * expanded (moved apart) in 'row' to match the final layout, when doing this 1203 * the pixels are *replicated* to the intervening space. This is essential for 1204 * the correct operation of png_combine_row, above. 1205 */ 1206 PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info, 1207 png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY); 1208 #endif 1209 1210 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 1211 1212 #ifdef PNG_WRITE_INTERLACING_SUPPORTED 1213 /* Grab pixels out of a row for an interlaced pass */ 1214 PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info, 1215 png_bytep row, int pass),PNG_EMPTY); 1216 #endif 1217 1218 /* Unfilter a row: check the filter value before calling this, there is no point 1219 * calling it for PNG_FILTER_VALUE_NONE. 1220 */ 1221 PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop 1222 row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY); 1223 1224 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info, 1225 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1226 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop 1227 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1228 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop 1229 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1230 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop 1231 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1232 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop 1233 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1234 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop 1235 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1236 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop 1237 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1238 1239 /* Choose the best filter to use and filter the row data */ 1240 PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr, 1241 png_row_infop row_info),PNG_EMPTY); 1242 1243 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED 1244 PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr, 1245 png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY); 1246 /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer 1247 * is NULL the function checks, instead, for the end of the stream. In this 1248 * case a benign error will be issued if the stream end is not found or if 1249 * extra data has to be consumed. 1250 */ 1251 PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr), 1252 PNG_EMPTY); 1253 /* This cleans up when the IDAT LZ stream does not end when the last image 1254 * byte is read; there is still some pending input. 1255 */ 1256 1257 PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr), 1258 PNG_EMPTY); 1259 /* Finish a row while reading, dealing with interlacing passes, etc. */ 1260 #endif /* SEQUENTIAL_READ */ 1261 1262 /* Initialize the row buffers, etc. */ 1263 PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY); 1264 1265 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1266 /* Optional call to update the users info structure */ 1267 PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr, 1268 png_inforp info_ptr),PNG_EMPTY); 1269 #endif 1270 1271 /* Shared transform functions, defined in pngtran.c */ 1272 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 1273 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 1274 PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info, 1275 png_bytep row, int at_start),PNG_EMPTY); 1276 #endif 1277 1278 #ifdef PNG_16BIT_SUPPORTED 1279 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 1280 PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info, 1281 png_bytep row),PNG_EMPTY); 1282 #endif 1283 #endif 1284 1285 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ 1286 defined(PNG_WRITE_PACKSWAP_SUPPORTED) 1287 PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info, 1288 png_bytep row),PNG_EMPTY); 1289 #endif 1290 1291 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 1292 PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info, 1293 png_bytep row),PNG_EMPTY); 1294 #endif 1295 1296 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1297 PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info, 1298 png_bytep row),PNG_EMPTY); 1299 #endif 1300 1301 /* The following decodes the appropriate chunks, and does error correction, 1302 * then calls the appropriate callback for the chunk if it is valid. 1303 */ 1304 1305 /* Decode the IHDR chunk */ 1306 PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr, 1307 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1308 PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr, 1309 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1310 PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr, 1311 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1312 1313 #ifdef PNG_READ_bKGD_SUPPORTED 1314 PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr, 1315 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1316 #endif 1317 1318 #ifdef PNG_READ_cHRM_SUPPORTED 1319 PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr, 1320 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1321 #endif 1322 1323 #ifdef PNG_READ_gAMA_SUPPORTED 1324 PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr, 1325 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1326 #endif 1327 1328 #ifdef PNG_READ_hIST_SUPPORTED 1329 PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr, 1330 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1331 #endif 1332 1333 #ifdef PNG_READ_iCCP_SUPPORTED 1334 PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr, 1335 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1336 #endif /* READ_iCCP */ 1337 1338 #ifdef PNG_READ_iTXt_SUPPORTED 1339 PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr, 1340 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1341 #endif 1342 1343 #ifdef PNG_READ_oFFs_SUPPORTED 1344 PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr, 1345 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1346 #endif 1347 1348 #ifdef PNG_READ_pCAL_SUPPORTED 1349 PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr, 1350 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1351 #endif 1352 1353 #ifdef PNG_READ_pHYs_SUPPORTED 1354 PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr, 1355 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1356 #endif 1357 1358 #ifdef PNG_READ_sBIT_SUPPORTED 1359 PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr, 1360 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1361 #endif 1362 1363 #ifdef PNG_READ_sCAL_SUPPORTED 1364 PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr, 1365 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1366 #endif 1367 1368 #ifdef PNG_READ_sPLT_SUPPORTED 1369 PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr, 1370 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1371 #endif /* READ_sPLT */ 1372 1373 #ifdef PNG_READ_sRGB_SUPPORTED 1374 PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr, 1375 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1376 #endif 1377 1378 #ifdef PNG_READ_tEXt_SUPPORTED 1379 PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr, 1380 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1381 #endif 1382 1383 #ifdef PNG_READ_tIME_SUPPORTED 1384 PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr, 1385 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1386 #endif 1387 1388 #ifdef PNG_READ_tRNS_SUPPORTED 1389 PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr, 1390 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1391 #endif 1392 1393 #ifdef PNG_READ_zTXt_SUPPORTED 1394 PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr, 1395 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1396 #endif 1397 1398 PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_structrp png_ptr, 1399 png_uint_32 chunk_name),PNG_EMPTY); 1400 1401 PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr, 1402 png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY); 1403 /* This is the function that gets called for unknown chunks. The 'keep' 1404 * argument is either non-zero for a known chunk that has been set to be 1405 * handled as unknown or zero for an unknown chunk. By default the function 1406 * just skips the chunk or errors out if it is critical. 1407 */ 1408 1409 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\ 1410 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 1411 PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling, 1412 (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY); 1413 /* Exactly as the API png_handle_as_unknown() except that the argument is a 1414 * 32-bit chunk name, not a string. 1415 */ 1416 #endif /* READ_UNKNOWN_CHUNKS || HANDLE_AS_UNKNOWN */ 1417 1418 /* Handle the transformations for reading and writing */ 1419 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1420 PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr, 1421 png_row_infop row_info),PNG_EMPTY); 1422 #endif 1423 #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED 1424 PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr, 1425 png_row_infop row_info),PNG_EMPTY); 1426 #endif 1427 1428 #ifdef PNG_READ_TRANSFORMS_SUPPORTED 1429 PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr), 1430 PNG_EMPTY); 1431 #endif 1432 1433 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1434 PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr, 1435 png_inforp info_ptr),PNG_EMPTY); 1436 PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr, 1437 png_inforp info_ptr),PNG_EMPTY); 1438 PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY); 1439 PNG_INTERNAL_FUNCTION(void,png_push_crc_skip,(png_structrp png_ptr, 1440 png_uint_32 length),PNG_EMPTY); 1441 PNG_INTERNAL_FUNCTION(void,png_push_crc_finish,(png_structrp png_ptr), 1442 PNG_EMPTY); 1443 PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr), 1444 PNG_EMPTY); 1445 PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr, 1446 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); 1447 PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY); 1448 PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr, 1449 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); 1450 PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr), 1451 PNG_EMPTY); 1452 PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr, 1453 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1454 PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr, 1455 png_inforp info_ptr),PNG_EMPTY); 1456 PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr, 1457 png_inforp info_ptr),PNG_EMPTY); 1458 PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr, 1459 png_bytep row),PNG_EMPTY); 1460 PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr, 1461 png_inforp info_ptr),PNG_EMPTY); 1462 PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr, 1463 png_inforp info_ptr),PNG_EMPTY); 1464 PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr), 1465 PNG_EMPTY); 1466 # ifdef PNG_READ_tEXt_SUPPORTED 1467 PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr, 1468 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1469 PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr, 1470 png_inforp info_ptr),PNG_EMPTY); 1471 # endif 1472 # ifdef PNG_READ_zTXt_SUPPORTED 1473 PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr, 1474 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1475 PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr, 1476 png_inforp info_ptr),PNG_EMPTY); 1477 # endif 1478 # ifdef PNG_READ_iTXt_SUPPORTED 1479 PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr, 1480 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1481 PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr, 1482 png_inforp info_ptr),PNG_EMPTY); 1483 # endif 1484 1485 #endif /* PROGRESSIVE_READ */ 1486 1487 /* Added at libpng version 1.6.0 */ 1488 #ifdef PNG_GAMMA_SUPPORTED 1489 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr, 1490 png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY); 1491 /* Set the colorspace gamma with a value provided by the application or by 1492 * the gAMA chunk on read. The value will override anything set by an ICC 1493 * profile. 1494 */ 1495 1496 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr, 1497 png_inforp info_ptr), PNG_EMPTY); 1498 /* Synchronize the info 'valid' flags with the colorspace */ 1499 1500 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr, 1501 png_inforp info_ptr), PNG_EMPTY); 1502 /* Copy the png_struct colorspace to the info_struct and call the above to 1503 * synchronize the flags. Checks for NULL info_ptr and does nothing. 1504 */ 1505 #endif 1506 1507 /* Added at libpng version 1.4.0 */ 1508 #ifdef PNG_COLORSPACE_SUPPORTED 1509 /* These internal functions are for maintaining the colorspace structure within 1510 * a png_info or png_struct (or, indeed, both). 1511 */ 1512 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities, 1513 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy, 1514 int preferred), PNG_EMPTY); 1515 1516 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints, 1517 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ, 1518 int preferred), PNG_EMPTY); 1519 1520 #ifdef PNG_sRGB_SUPPORTED 1521 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr, 1522 png_colorspacerp colorspace, int intent), PNG_EMPTY); 1523 /* This does set the colorspace gAMA and cHRM values too, but doesn't set the 1524 * flags to write them, if it returns false there was a problem and an error 1525 * message has already been output (but the colorspace may still need to be 1526 * synced to record the invalid flag). 1527 */ 1528 #endif /* sRGB */ 1529 1530 #ifdef PNG_iCCP_SUPPORTED 1531 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr, 1532 png_colorspacerp colorspace, png_const_charp name, 1533 png_uint_32 profile_length, png_const_bytep profile, int color_type), 1534 PNG_EMPTY); 1535 /* The 'name' is used for information only */ 1536 1537 /* Routines for checking parts of an ICC profile. */ 1538 PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr, 1539 png_colorspacerp colorspace, png_const_charp name, 1540 png_uint_32 profile_length), PNG_EMPTY); 1541 PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr, 1542 png_colorspacerp colorspace, png_const_charp name, 1543 png_uint_32 profile_length, 1544 png_const_bytep profile /* first 132 bytes only */, int color_type), 1545 PNG_EMPTY); 1546 PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr, 1547 png_colorspacerp colorspace, png_const_charp name, 1548 png_uint_32 profile_length, 1549 png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY); 1550 #ifdef PNG_sRGB_SUPPORTED 1551 PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,( 1552 png_const_structrp png_ptr, png_colorspacerp colorspace, 1553 png_const_bytep profile, uLong adler), PNG_EMPTY); 1554 /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may 1555 * be zero to indicate that it is not available. It is used, if provided, 1556 * as a fast check on the profile when checking to see if it is sRGB. 1557 */ 1558 #endif 1559 #endif /* iCCP */ 1560 1561 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1562 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients, 1563 (png_structrp png_ptr), PNG_EMPTY); 1564 /* Set the rgb_to_gray coefficients from the colorspace Y values */ 1565 #endif /* READ_RGB_TO_GRAY */ 1566 #endif /* COLORSPACE */ 1567 1568 /* Added at libpng version 1.4.0 */ 1569 PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr, 1570 png_uint_32 width, png_uint_32 height, int bit_depth, 1571 int color_type, int interlace_type, int compression_type, 1572 int filter_type),PNG_EMPTY); 1573 1574 /* Added at libpng version 1.5.10 */ 1575 #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \ 1576 defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED) 1577 PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes, 1578 (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY); 1579 #endif 1580 1581 #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) 1582 PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr, 1583 png_const_charp name),PNG_NORETURN); 1584 #endif 1585 1586 /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite 1587 * the end. Always leaves the buffer nul terminated. Never errors out (and 1588 * there is no error code.) 1589 */ 1590 PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize, 1591 size_t pos, png_const_charp string),PNG_EMPTY); 1592 1593 /* Various internal functions to handle formatted warning messages, currently 1594 * only implemented for warnings. 1595 */ 1596 #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) 1597 /* Utility to dump an unsigned value into a buffer, given a start pointer and 1598 * and end pointer (which should point just *beyond* the end of the buffer!) 1599 * Returns the pointer to the start of the formatted string. This utility only 1600 * does unsigned values. 1601 */ 1602 PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start, 1603 png_charp end, int format, png_alloc_size_t number),PNG_EMPTY); 1604 1605 /* Convenience macro that takes an array: */ 1606 #define PNG_FORMAT_NUMBER(buffer,format,number) \ 1607 png_format_number(buffer, buffer + (sizeof buffer), format, number) 1608 1609 /* Suggested size for a number buffer (enough for 64 bits and a sign!) */ 1610 #define PNG_NUMBER_BUFFER_SIZE 24 1611 1612 /* These are the integer formats currently supported, the name is formed from 1613 * the standard printf(3) format string. 1614 */ 1615 #define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */ 1616 #define PNG_NUMBER_FORMAT_02u 2 1617 #define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */ 1618 #define PNG_NUMBER_FORMAT_02d 2 1619 #define PNG_NUMBER_FORMAT_x 3 1620 #define PNG_NUMBER_FORMAT_02x 4 1621 #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */ 1622 #endif 1623 1624 #ifdef PNG_WARNINGS_SUPPORTED 1625 /* New defines and members adding in libpng-1.5.4 */ 1626 # define PNG_WARNING_PARAMETER_SIZE 32 1627 # define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */ 1628 1629 /* An l-value of this type has to be passed to the APIs below to cache the 1630 * values of the parameters to a formatted warning message. 1631 */ 1632 typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][ 1633 PNG_WARNING_PARAMETER_SIZE]; 1634 1635 PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p, 1636 int number, png_const_charp string),PNG_EMPTY); 1637 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters, 1638 * including the trailing '\0'. 1639 */ 1640 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned, 1641 (png_warning_parameters p, int number, int format, png_alloc_size_t value), 1642 PNG_EMPTY); 1643 /* Use png_alloc_size_t because it is an unsigned type as big as any we 1644 * need to output. Use the following for a signed value. 1645 */ 1646 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed, 1647 (png_warning_parameters p, int number, int format, png_int_32 value), 1648 PNG_EMPTY); 1649 1650 PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr, 1651 png_warning_parameters p, png_const_charp message),PNG_EMPTY); 1652 /* 'message' follows the X/Open approach of using @1, @2 to insert 1653 * parameters previously supplied using the above functions. Errors in 1654 * specifying the parameters will simply result in garbage substitutions. 1655 */ 1656 #endif 1657 1658 #ifdef PNG_BENIGN_ERRORS_SUPPORTED 1659 /* Application errors (new in 1.6); use these functions (declared below) for 1660 * errors in the parameters or order of API function calls on read. The 1661 * 'warning' should be used for an error that can be handled completely; the 1662 * 'error' for one which can be handled safely but which may lose application 1663 * information or settings. 1664 * 1665 * By default these both result in a png_error call prior to release, while in a 1666 * released version the 'warning' is just a warning. However if the application 1667 * explicitly disables benign errors (explicitly permitting the code to lose 1668 * information) they both turn into warnings. 1669 * 1670 * If benign errors aren't supported they end up as the corresponding base call 1671 * (png_warning or png_error.) 1672 */ 1673 PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr, 1674 png_const_charp message),PNG_EMPTY); 1675 /* The application provided invalid parameters to an API function or called 1676 * an API function at the wrong time, libpng can completely recover. 1677 */ 1678 1679 PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr, 1680 png_const_charp message),PNG_EMPTY); 1681 /* As above but libpng will ignore the call, or attempt some other partial 1682 * recovery from the error. 1683 */ 1684 #else 1685 # define png_app_warning(pp,s) png_warning(pp,s) 1686 # define png_app_error(pp,s) png_error(pp,s) 1687 #endif 1688 1689 PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr, 1690 png_const_charp message, int error),PNG_EMPTY); 1691 /* Report a recoverable issue in chunk data. On read this is used to report 1692 * a problem found while reading a particular chunk and the 1693 * png_chunk_benign_error or png_chunk_warning function is used as 1694 * appropriate. On write this is used to report an error that comes from 1695 * data set via an application call to a png_set_ API and png_app_error or 1696 * png_app_warning is used as appropriate. 1697 * 1698 * The 'error' parameter must have one of the following values: 1699 */ 1700 #define PNG_CHUNK_WARNING 0 /* never an error */ 1701 #define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */ 1702 #define PNG_CHUNK_ERROR 2 /* always an error */ 1703 1704 /* ASCII to FP interfaces, currently only implemented if sCAL 1705 * support is required. 1706 */ 1707 #if defined(PNG_sCAL_SUPPORTED) 1708 /* MAX_DIGITS is actually the maximum number of characters in an sCAL 1709 * width or height, derived from the precision (number of significant 1710 * digits - a build time settable option) and assumptions about the 1711 * maximum ridiculous exponent. 1712 */ 1713 #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/) 1714 1715 #ifdef PNG_FLOATING_POINT_SUPPORTED 1716 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr, 1717 png_charp ascii, png_size_t size, double fp, unsigned int precision), 1718 PNG_EMPTY); 1719 #endif /* FLOATING_POINT */ 1720 1721 #ifdef PNG_FIXED_POINT_SUPPORTED 1722 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr, 1723 png_charp ascii, png_size_t size, png_fixed_point fp),PNG_EMPTY); 1724 #endif /* FIXED_POINT */ 1725 #endif /* sCAL */ 1726 1727 #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) 1728 /* An internal API to validate the format of a floating point number. 1729 * The result is the index of the next character. If the number is 1730 * not valid it will be the index of a character in the supposed number. 1731 * 1732 * The format of a number is defined in the PNG extensions specification 1733 * and this API is strictly conformant to that spec, not anyone elses! 1734 * 1735 * The format as a regular expression is: 1736 * 1737 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)? 1738 * 1739 * or: 1740 * 1741 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)? 1742 * 1743 * The complexity is that either integer or fraction must be present and the 1744 * fraction is permitted to have no digits only if the integer is present. 1745 * 1746 * NOTE: The dangling E problem. 1747 * There is a PNG valid floating point number in the following: 1748 * 1749 * PNG floating point numbers are not greedy. 1750 * 1751 * Working this out requires *TWO* character lookahead (because of the 1752 * sign), the parser does not do this - it will fail at the 'r' - this 1753 * doesn't matter for PNG sCAL chunk values, but it requires more care 1754 * if the value were ever to be embedded in something more complex. Use 1755 * ANSI-C strtod if you need the lookahead. 1756 */ 1757 /* State table for the parser. */ 1758 #define PNG_FP_INTEGER 0 /* before or in integer */ 1759 #define PNG_FP_FRACTION 1 /* before or in fraction */ 1760 #define PNG_FP_EXPONENT 2 /* before or in exponent */ 1761 #define PNG_FP_STATE 3 /* mask for the above */ 1762 #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */ 1763 #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */ 1764 #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */ 1765 #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */ 1766 #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */ 1767 1768 /* These three values don't affect the parser. They are set but not used. 1769 */ 1770 #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */ 1771 #define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */ 1772 #define PNG_FP_NONZERO 256 /* A non-zero value */ 1773 #define PNG_FP_STICKY 448 /* The above three flags */ 1774 1775 /* This is available for the caller to store in 'state' if required. Do not 1776 * call the parser after setting it (the parser sometimes clears it.) 1777 */ 1778 #define PNG_FP_INVALID 512 /* Available for callers as a distinct value */ 1779 1780 /* Result codes for the parser (boolean - true meants ok, false means 1781 * not ok yet.) 1782 */ 1783 #define PNG_FP_MAYBE 0 /* The number may be valid in the future */ 1784 #define PNG_FP_OK 1 /* The number is valid */ 1785 1786 /* Tests on the sticky non-zero and negative flags. To pass these checks 1787 * the state must also indicate that the whole number is valid - this is 1788 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this 1789 * is equivalent to PNG_FP_OK above.) 1790 */ 1791 #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO) 1792 /* NZ_MASK: the string is valid and a non-zero negative value */ 1793 #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO) 1794 /* Z MASK: the string is valid and a non-zero value. */ 1795 /* PNG_FP_SAW_DIGIT: the string is valid. */ 1796 #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT) 1797 #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK) 1798 #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK) 1799 1800 /* The actual parser. This can be called repeatedly. It updates 1801 * the index into the string and the state variable (which must 1802 * be initialized to 0). It returns a result code, as above. There 1803 * is no point calling the parser any more if it fails to advance to 1804 * the end of the string - it is stuck on an invalid character (or 1805 * terminated by '\0'). 1806 * 1807 * Note that the pointer will consume an E or even an E+ and then leave 1808 * a 'maybe' state even though a preceding integer.fraction is valid. 1809 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was 1810 * a valid number. It's possible to recover from this by calling 1811 * the parser again (from the start, with state 0) but with a string 1812 * that omits the last character (i.e. set the size to the index of 1813 * the problem character.) This has not been tested within libpng. 1814 */ 1815 PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string, 1816 png_size_t size, int *statep, png_size_tp whereami),PNG_EMPTY); 1817 1818 /* This is the same but it checks a complete string and returns true 1819 * only if it just contains a floating point number. As of 1.5.4 this 1820 * function also returns the state at the end of parsing the number if 1821 * it was valid (otherwise it returns 0.) This can be used for testing 1822 * for negative or zero values using the sticky flag. 1823 */ 1824 PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string, 1825 png_size_t size),PNG_EMPTY); 1826 #endif /* pCAL || sCAL */ 1827 1828 #if defined(PNG_GAMMA_SUPPORTED) ||\ 1829 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED) 1830 /* Added at libpng version 1.5.0 */ 1831 /* This is a utility to provide a*times/div (rounded) and indicate 1832 * if there is an overflow. The result is a boolean - false (0) 1833 * for overflow, true (1) if no overflow, in which case *res 1834 * holds the result. 1835 */ 1836 PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a, 1837 png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY); 1838 #endif 1839 1840 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED) 1841 /* Same deal, but issue a warning on overflow and return 0. */ 1842 PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn, 1843 (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by, 1844 png_int_32 divided_by),PNG_EMPTY); 1845 #endif 1846 1847 #ifdef PNG_GAMMA_SUPPORTED 1848 /* Calculate a reciprocal - used for gamma values. This returns 1849 * 0 if the argument is 0 in order to maintain an undefined value; 1850 * there are no warnings. 1851 */ 1852 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a), 1853 PNG_EMPTY); 1854 1855 #ifdef PNG_READ_GAMMA_SUPPORTED 1856 /* The same but gives a reciprocal of the product of two fixed point 1857 * values. Accuracy is suitable for gamma calculations but this is 1858 * not exact - use png_muldiv for that. Only required at present on read. 1859 */ 1860 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a, 1861 png_fixed_point b),PNG_EMPTY); 1862 #endif 1863 1864 /* Return true if the gamma value is significantly different from 1.0 */ 1865 PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value), 1866 PNG_EMPTY); 1867 #endif 1868 1869 #ifdef PNG_READ_GAMMA_SUPPORTED 1870 /* Internal fixed point gamma correction. These APIs are called as 1871 * required to convert single values - they don't need to be fast, 1872 * they are not used when processing image pixel values. 1873 * 1874 * While the input is an 'unsigned' value it must actually be the 1875 * correct bit value - 0..255 or 0..65535 as required. 1876 */ 1877 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr, 1878 unsigned int value, png_fixed_point gamma_value),PNG_EMPTY); 1879 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value, 1880 png_fixed_point gamma_value),PNG_EMPTY); 1881 PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value, 1882 png_fixed_point gamma_value),PNG_EMPTY); 1883 PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr), 1884 PNG_EMPTY); 1885 PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr, 1886 int bit_depth),PNG_EMPTY); 1887 #endif 1888 1889 /* SIMPLIFIED READ/WRITE SUPPORT */ 1890 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 1891 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 1892 /* The internal structure that png_image::opaque points to. */ 1893 typedef struct png_control 1894 { 1895 png_structp png_ptr; 1896 png_infop info_ptr; 1897 png_voidp error_buf; /* Always a jmp_buf at present. */ 1898 1899 png_const_bytep memory; /* Memory buffer. */ 1900 png_size_t size; /* Size of the memory buffer. */ 1901 1902 unsigned int for_write :1; /* Otherwise it is a read structure */ 1903 unsigned int owned_file :1; /* We own the file in io_ptr */ 1904 } png_control; 1905 1906 /* Return the pointer to the jmp_buf from a png_control: necessary because C 1907 * does not reveal the type of the elements of jmp_buf. 1908 */ 1909 #ifdef __cplusplus 1910 # define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0]) 1911 #else 1912 # define png_control_jmp_buf(pc) ((pc)->error_buf) 1913 #endif 1914 1915 /* Utility to safely execute a piece of libpng code catching and logging any 1916 * errors that might occur. Returns true on success, false on failure (either 1917 * of the function or as a result of a png_error.) 1918 */ 1919 PNG_INTERNAL_CALLBACK(void,png_safe_error,(png_structp png_ptr, 1920 png_const_charp error_message),PNG_NORETURN); 1921 1922 #ifdef PNG_WARNINGS_SUPPORTED 1923 PNG_INTERNAL_CALLBACK(void,png_safe_warning,(png_structp png_ptr, 1924 png_const_charp warning_message),PNG_EMPTY); 1925 #else 1926 # define png_safe_warning 0/*dummy argument*/ 1927 #endif 1928 1929 PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image, 1930 int (*function)(png_voidp), png_voidp arg),PNG_EMPTY); 1931 1932 /* Utility to log an error; this also cleans up the png_image; the function 1933 * always returns 0 (false). 1934 */ 1935 PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image, 1936 png_const_charp error_message),PNG_EMPTY); 1937 1938 #ifndef PNG_SIMPLIFIED_READ_SUPPORTED 1939 /* png_image_free is used by the write code but not exported */ 1940 PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY); 1941 #endif /* !SIMPLIFIED_READ */ 1942 1943 #endif /* SIMPLIFIED READ/WRITE */ 1944 1945 /* These are initialization functions for hardware specific PNG filter 1946 * optimizations; list these here then select the appropriate one at compile 1947 * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined 1948 * the generic code is used. 1949 */ 1950 #ifdef PNG_FILTER_OPTIMIZATIONS 1951 PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr, 1952 unsigned int bpp), PNG_EMPTY); 1953 /* Just declare the optimization that will be used */ 1954 #else 1955 /* List *all* the possible optimizations here - this branch is required if 1956 * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in 1957 * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing. 1958 */ 1959 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon, 1960 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 1961 #endif 1962 1963 /* Maintainer: Put new private prototypes here ^ */ 1964 1965 #include "pngdebug.h" 1966 1967 #ifdef __cplusplus 1968 } 1969 #endif 1970 1971 #endif /* PNG_VERSION_INFO_ONLY */ 1972 #endif /* PNGPRIV_H */