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 * Copyright (c) 2018-2019 Cosmin Truta
33 * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
34 * Copyright (c) 1996-1997 Andreas Dilger
35 * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
36 *
37 * This code is released under the libpng license.
38 * For conditions of distribution and use, see the disclaimer
39 * and license in png.h
40 */
41
42 /* The symbols declared in this file (including the functions declared
43 * as extern) are PRIVATE. They are not part of the libpng public
44 * interface, and are not recommended for use by regular applications.
45 * Some of them may become public in the future; others may stay private,
46 * change in an incompatible way, or even disappear.
47 * Although the libpng users are not forbidden to include this header,
48 * they should be well aware of the issues that may arise from doing so.
49 */
50
51 #ifndef PNGPRIV_H
52 #define PNGPRIV_H
53
54 /* Feature Test Macros. The following are defined here to ensure that correctly
55 * implemented libraries reveal the APIs libpng needs to build and hide those
56 * that are not needed and potentially damaging to the compilation.
57 *
58 * Feature Test Macros must be defined before any system header is included (see
59 * POSIX 1003.1 2.8.2 "POSIX Symbols."
60 *
61 * These macros only have an effect if the operating system supports either
62 * POSIX 1003.1 or C99, or both. On other operating systems (particularly
63 * Windows/Visual Studio) there is no effect; the OS specific tests below are
64 * still required (as of 2011-05-02.)
65 */
66 #ifndef _POSIX_SOURCE
67 # define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */
68 #endif
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 the deprecated
152 * __ARM_NEON__, so we check both variants.
153 *
154 * To disable ARM_NEON optimizations entirely, and skip compiling the
155 * associated assembler code, pass --enable-arm-neon=no to configure
156 * or put -DPNG_ARM_NEON_OPT=0 in CPPFLAGS.
157 */
158 # if (defined(__ARM_NEON__) || defined(__ARM_NEON)) && \
159 defined(PNG_ALIGNED_MEMORY_SUPPORTED)
160 # define PNG_ARM_NEON_OPT 2
161 # else
162 # define PNG_ARM_NEON_OPT 0
163 # endif
164 #endif
165
166 #if PNG_ARM_NEON_OPT > 0
167 /* NEON optimizations are to be at least considered by libpng, so enable the
168 * callbacks to do this.
169 */
170 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_neon
171
172 /* By default the 'intrinsics' code in arm/filter_neon_intrinsics.c is used
173 * if possible - if __ARM_NEON__ is set and the compiler version is not known
174 * to be broken. This is controlled by PNG_ARM_NEON_IMPLEMENTATION which can
175 * be:
176 *
177 * 1 The intrinsics code (the default with __ARM_NEON__)
178 * 2 The hand coded assembler (the default without __ARM_NEON__)
179 *
180 * It is possible to set PNG_ARM_NEON_IMPLEMENTATION in CPPFLAGS, however
181 * this is *NOT* supported and may cease to work even after a minor revision
182 * to libpng. It *is* valid to do this for testing purposes, e.g. speed
183 * testing or a new compiler, but the results should be communicated to the
184 * libpng implementation list for incorporation in the next minor release.
185 */
186 # ifndef PNG_ARM_NEON_IMPLEMENTATION
187 # if defined(__ARM_NEON__) || defined(__ARM_NEON)
188 # if defined(__clang__)
189 /* At present it is unknown by the libpng developers which versions
190 * of clang support the intrinsics, however some or perhaps all
191 * versions do not work with the assembler so this may be
192 * irrelevant, so just use the default (do nothing here.)
193 */
194 # elif defined(__GNUC__)
195 /* GCC 4.5.4 NEON support is known to be broken. 4.6.3 is known to
196 * work, so if this *is* GCC, or G++, look for a version >4.5
197 */
198 # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)
199 # define PNG_ARM_NEON_IMPLEMENTATION 2
200 # endif /* no GNUC support */
201 # endif /* __GNUC__ */
202 # else /* !defined __ARM_NEON__ */
203 /* The 'intrinsics' code simply won't compile without this -mfpu=neon:
204 */
205 # if !defined(__aarch64__)
206 /* The assembler code currently does not work on ARM64 */
207 # define PNG_ARM_NEON_IMPLEMENTATION 2
208 # endif /* __aarch64__ */
209 # endif /* __ARM_NEON__ */
210 # endif /* !PNG_ARM_NEON_IMPLEMENTATION */
211
212 # ifndef PNG_ARM_NEON_IMPLEMENTATION
213 /* Use the intrinsics code by default. */
214 # define PNG_ARM_NEON_IMPLEMENTATION 1
215 # endif
216 #endif /* PNG_ARM_NEON_OPT > 0 */
217
218 #ifndef PNG_MIPS_MSA_OPT
219 # if defined(__mips_msa) && (__mips_isa_rev >= 5) && defined(PNG_ALIGNED_MEMORY_SUPPORTED)
220 # define PNG_MIPS_MSA_OPT 2
221 # else
222 # define PNG_MIPS_MSA_OPT 0
223 # endif
224 #endif
225
226 #ifndef PNG_POWERPC_VSX_OPT
227 # if defined(__PPC64__) && defined(__ALTIVEC__) && defined(__VSX__)
228 # define PNG_POWERPC_VSX_OPT 2
229 # else
230 # define PNG_POWERPC_VSX_OPT 0
231 # endif
232 #endif
233
234 #ifndef PNG_INTEL_SSE_OPT
235 # ifdef PNG_INTEL_SSE
236 /* Only check for SSE if the build configuration has been modified to
237 * enable SSE optimizations. This means that these optimizations will
238 * be off by default. See contrib/intel for more details.
239 */
240 # if defined(__SSE4_1__) || defined(__AVX__) || defined(__SSSE3__) || \
241 defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \
242 (defined(_M_IX86_FP) && _M_IX86_FP >= 2)
243 # define PNG_INTEL_SSE_OPT 1
244 # else
245 # define PNG_INTEL_SSE_OPT 0
246 # endif
247 # else
248 # define PNG_INTEL_SSE_OPT 0
249 # endif
250 #endif
251
252 #if PNG_INTEL_SSE_OPT > 0
253 # ifndef PNG_INTEL_SSE_IMPLEMENTATION
254 # if defined(__SSE4_1__) || defined(__AVX__)
255 /* We are not actually using AVX, but checking for AVX is the best
256 way we can detect SSE4.1 and SSSE3 on MSVC.
257 */
258 # define PNG_INTEL_SSE_IMPLEMENTATION 3
259 # elif defined(__SSSE3__)
260 # define PNG_INTEL_SSE_IMPLEMENTATION 2
261 # elif defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \
262 (defined(_M_IX86_FP) && _M_IX86_FP >= 2)
263 # define PNG_INTEL_SSE_IMPLEMENTATION 1
264 # else
265 # define PNG_INTEL_SSE_IMPLEMENTATION 0
266 # endif
267 # endif
268
269 # if PNG_INTEL_SSE_IMPLEMENTATION > 0
270 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_sse2
271 # endif
272 #else
273 # define PNG_INTEL_SSE_IMPLEMENTATION 0
274 #endif
275
276 #if PNG_MIPS_MSA_OPT > 0
277 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_msa
278 # ifndef PNG_MIPS_MSA_IMPLEMENTATION
279 # if defined(__mips_msa)
280 # if defined(__clang__)
281 # elif defined(__GNUC__)
282 # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7)
283 # define PNG_MIPS_MSA_IMPLEMENTATION 2
284 # endif /* no GNUC support */
285 # endif /* __GNUC__ */
286 # else /* !defined __mips_msa */
287 # define PNG_MIPS_MSA_IMPLEMENTATION 2
288 # endif /* __mips_msa */
289 # endif /* !PNG_MIPS_MSA_IMPLEMENTATION */
290
291 # ifndef PNG_MIPS_MSA_IMPLEMENTATION
292 # define PNG_MIPS_MSA_IMPLEMENTATION 1
293 # endif
294 #endif /* PNG_MIPS_MSA_OPT > 0 */
295
296 #ifdef PNG_POWERPC_VSX_API_SUPPORTED
297 #if PNG_POWERPC_VSX_OPT > 0
298 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_vsx
299 # define PNG_POWERPC_VSX_IMPLEMENTATION 1
300 #endif
301 #endif
302
303
304
305 /* Is this a build of a DLL where compilation of the object modules requires
306 * different preprocessor settings to those required for a simple library? If
307 * so PNG_BUILD_DLL must be set.
308 *
309 * If libpng is used inside a DLL but that DLL does not export the libpng APIs
310 * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a
311 * static library of libpng then link the DLL against that.
312 */
313 #ifndef PNG_BUILD_DLL
314 # ifdef DLL_EXPORT
315 /* This is set by libtool when files are compiled for a DLL; libtool
316 * always compiles twice, even on systems where it isn't necessary. Set
317 * PNG_BUILD_DLL in case it is necessary:
318 */
319 # define PNG_BUILD_DLL
320 # else
321 # ifdef _WINDLL
322 /* This is set by the Microsoft Visual Studio IDE in projects that
323 * build a DLL. It can't easily be removed from those projects (it
324 * isn't visible in the Visual Studio UI) so it is a fairly reliable
325 * indication that PNG_IMPEXP needs to be set to the DLL export
326 * attributes.
327 */
328 # define PNG_BUILD_DLL
329 # else
330 # ifdef __DLL__
331 /* This is set by the Borland C system when compiling for a DLL
332 * (as above.)
333 */
334 # define PNG_BUILD_DLL
335 # else
336 /* Add additional compiler cases here. */
337 # endif
338 # endif
339 # endif
340 #endif /* Setting PNG_BUILD_DLL if required */
341
342 /* See pngconf.h for more details: the builder of the library may set this on
343 * the command line to the right thing for the specific compilation system or it
344 * may be automagically set above (at present we know of no system where it does
345 * need to be set on the command line.)
346 *
347 * PNG_IMPEXP must be set here when building the library to prevent pngconf.h
348 * setting it to the "import" setting for a DLL build.
349 */
350 #ifndef PNG_IMPEXP
351 # ifdef PNG_BUILD_DLL
352 # define PNG_IMPEXP PNG_DLL_EXPORT
353 # else
354 /* Not building a DLL, or the DLL doesn't require specific export
355 * definitions.
356 */
357 # define PNG_IMPEXP
358 # endif
359 #endif
360
361 /* No warnings for private or deprecated functions in the build: */
362 #ifndef PNG_DEPRECATED
363 # define PNG_DEPRECATED
364 #endif
365 #ifndef PNG_PRIVATE
366 # define PNG_PRIVATE
367 #endif
368
369 /* Symbol preprocessing support.
370 *
371 * To enable listing global, but internal, symbols the following macros should
372 * always be used to declare an extern data or function object in this file.
373 */
374 #ifndef PNG_INTERNAL_DATA
375 # define PNG_INTERNAL_DATA(type, name, array) PNG_LINKAGE_DATA type name array
376 #endif
377
378 #ifndef PNG_INTERNAL_FUNCTION
379 # define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\
380 PNG_LINKAGE_FUNCTION PNG_FUNCTION(type, name, args, PNG_EMPTY attributes)
381 #endif
382
383 #ifndef PNG_INTERNAL_CALLBACK
384 # define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\
385 PNG_LINKAGE_CALLBACK PNG_FUNCTION(type, (PNGCBAPI name), args,\
386 PNG_EMPTY attributes)
387 #endif
388
389 /* If floating or fixed point APIs are disabled they may still be compiled
390 * internally. To handle this make sure they are declared as the appropriate
391 * internal extern function (otherwise the symbol prefixing stuff won't work and
392 * the functions will be used without definitions.)
393 *
394 * NOTE: although all the API functions are declared here they are not all
395 * actually built! Because the declarations are still made it is necessary to
396 * fake out types that they depend on.
397 */
398 #ifndef PNG_FP_EXPORT
399 # ifndef PNG_FLOATING_POINT_SUPPORTED
400 # define PNG_FP_EXPORT(ordinal, type, name, args)\
401 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
402 # ifndef PNG_VERSION_INFO_ONLY
403 typedef struct png_incomplete png_double;
404 typedef png_double* png_doublep;
405 typedef const png_double* png_const_doublep;
406 typedef png_double** png_doublepp;
407 # endif
408 # endif
409 #endif
410 #ifndef PNG_FIXED_EXPORT
411 # ifndef PNG_FIXED_POINT_SUPPORTED
412 # define PNG_FIXED_EXPORT(ordinal, type, name, args)\
413 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
414 # endif
415 #endif
416
417 #include "png.h"
418
419 /* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */
420 #ifndef PNG_DLL_EXPORT
421 # define PNG_DLL_EXPORT
422 #endif
423
424 /* This is a global switch to set the compilation for an installed system
425 * (a release build). It can be set for testing debug builds to ensure that
426 * they will compile when the build type is switched to RC or STABLE, the
427 * default is just to use PNG_LIBPNG_BUILD_BASE_TYPE. Set this in CPPFLAGS
428 * with either:
429 *
430 * -DPNG_RELEASE_BUILD Turns on the release compile path
431 * -DPNG_RELEASE_BUILD=0 Turns it off
432 * or in your pngusr.h with
433 * #define PNG_RELEASE_BUILD=1 Turns on the release compile path
434 * #define PNG_RELEASE_BUILD=0 Turns it off
435 */
436 #ifndef PNG_RELEASE_BUILD
437 # define PNG_RELEASE_BUILD (PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC)
438 #endif
439
440 /* SECURITY and SAFETY:
441 *
442 * libpng is built with support for internal limits on image dimensions and
443 * memory usage. These are documented in scripts/pnglibconf.dfa of the
444 * source and recorded in the machine generated header file pnglibconf.h.
445 */
446
447 /* If you are running on a machine where you cannot allocate more
448 * than 64K of memory at once, uncomment this. While libpng will not
449 * normally need that much memory in a chunk (unless you load up a very
450 * large file), zlib needs to know how big of a chunk it can use, and
451 * libpng thus makes sure to check any memory allocation to verify it
452 * will fit into memory.
453 *
454 * zlib provides 'MAXSEG_64K' which, if defined, indicates the
455 * same limit and pngconf.h (already included) sets the limit
456 * if certain operating systems are detected.
457 */
458 #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
459 # define PNG_MAX_MALLOC_64K
460 #endif
461
462 #ifndef PNG_UNUSED
463 /* Unused formal parameter warnings are silenced using the following macro
464 * which is expected to have no bad effects on performance (optimizing
465 * compilers will probably remove it entirely). Note that if you replace
466 * it with something other than whitespace, you must include the terminating
467 * semicolon.
468 */
469 # define PNG_UNUSED(param) (void)param;
470 #endif
471
472 /* Just a little check that someone hasn't tried to define something
473 * contradictory.
474 */
475 #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K)
476 # undef PNG_ZBUF_SIZE
477 # define PNG_ZBUF_SIZE 65536L
478 #endif
479
480 /* If warnings or errors are turned off the code is disabled or redirected here.
481 * From 1.5.4 functions have been added to allow very limited formatting of
482 * error and warning messages - this code will also be disabled here.
483 */
484 #ifdef PNG_WARNINGS_SUPPORTED
485 # define PNG_WARNING_PARAMETERS(p) png_warning_parameters p;
486 #else
487 # define png_warning_parameter(p,number,string) ((void)0)
488 # define png_warning_parameter_unsigned(p,number,format,value) ((void)0)
489 # define png_warning_parameter_signed(p,number,format,value) ((void)0)
490 # define png_formatted_warning(pp,p,message) ((void)(pp))
491 # define PNG_WARNING_PARAMETERS(p)
492 #endif
493 #ifndef PNG_ERROR_TEXT_SUPPORTED
494 # define png_fixed_error(s1,s2) png_err(s1)
495 #endif
496
497 /* Some fixed point APIs are still required even if not exported because
498 * they get used by the corresponding floating point APIs. This magic
499 * deals with this:
500 */
501 #ifdef PNG_FIXED_POINT_SUPPORTED
502 # define PNGFAPI PNGAPI
503 #else
504 # define PNGFAPI /* PRIVATE */
505 #endif
506
507 #ifndef PNG_VERSION_INFO_ONLY
508 /* Other defines specific to compilers can go here. Try to keep
509 * them inside an appropriate ifdef/endif pair for portability.
510 */
511
512 /* C allows up-casts from (void*) to any pointer and (const void*) to any
513 * pointer to a const object. C++ regards this as a type error and requires an
514 * explicit, static, cast and provides the static_cast<> rune to ensure that
515 * const is not cast away.
516 */
517 #ifdef __cplusplus
518 # define png_voidcast(type, value) static_cast<type>(value)
519 # define png_constcast(type, value) const_cast<type>(value)
520 # define png_aligncast(type, value) \
521 static_cast<type>(static_cast<void*>(value))
522 # define png_aligncastconst(type, value) \
523 static_cast<type>(static_cast<const void*>(value))
524 #else
525 # define png_voidcast(type, value) (value)
526 # ifdef _WIN64
527 # ifdef __GNUC__
528 typedef unsigned long long png_ptruint;
529 # else
530 typedef unsigned __int64 png_ptruint;
531 # endif
532 # else
533 typedef unsigned long png_ptruint;
534 # endif
535 # define png_constcast(type, value) ((type)(png_ptruint)(const void*)(value))
536 # define png_aligncast(type, value) ((void*)(value))
537 # define png_aligncastconst(type, value) ((const void*)(value))
538 #endif /* __cplusplus */
539
540 #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\
541 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
542 /* png.c requires the following ANSI-C constants if the conversion of
543 * floating point to ASCII is implemented therein:
544 *
545 * DBL_DIG Maximum number of decimal digits (can be set to any constant)
546 * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value)
547 * DBL_MAX Maximum floating point number (can be set to an arbitrary value)
548 */
549 # include <float.h>
550
551 # if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
552 defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
553 /* We need to check that <math.h> hasn't already been included earlier
554 * as it seems it doesn't agree with <fp.h>, yet we should really use
555 * <fp.h> if possible.
556 */
557 # if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
558 # include <fp.h>
559 # endif
560 # else
561 # include <math.h>
562 # endif
563 # if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
564 /* Amiga SAS/C: We must include builtin FPU functions when compiling using
565 * MATH=68881
566 */
567 # include <m68881.h>
568 # endif
569 #endif
570
571 /* This provides the non-ANSI (far) memory allocation routines. */
572 #if defined(__TURBOC__) && defined(__MSDOS__)
573 # include <mem.h>
574 # include <alloc.h>
575 #endif
576
577 #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \
578 defined(_WIN32) || defined(__WIN32__)
579 # include <windows.h> /* defines _WINDOWS_ macro */
580 #endif
581 #endif /* PNG_VERSION_INFO_ONLY */
582
583 /* Moved here around 1.5.0beta36 from pngconf.h */
584 /* Users may want to use these so they are not private. Any library
585 * functions that are passed far data must be model-independent.
586 */
587
588 /* Memory model/platform independent fns */
589 #ifndef PNG_ABORT
590 # ifdef _WINDOWS_
591 # define PNG_ABORT() ExitProcess(0)
592 # else
593 # define PNG_ABORT() abort()
594 # endif
595 #endif
596
597 /* These macros may need to be architecture dependent. */
598 #define PNG_ALIGN_NONE 0 /* do not use data alignment */
599 #define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */
600 #ifdef offsetof
601 # define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */
602 #else
603 # define PNG_ALIGN_OFFSET -1 /* prevent the use of this */
604 #endif
605 #define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */
606
607 #ifndef PNG_ALIGN_TYPE
608 /* Default to using aligned access optimizations and requiring alignment to a
609 * multiple of the data type size. Override in a compiler specific fashion
610 * if necessary by inserting tests here:
611 */
612 # define PNG_ALIGN_TYPE PNG_ALIGN_SIZE
613 #endif
614
615 #if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE
616 /* This is used because in some compiler implementations non-aligned
617 * structure members are supported, so the offsetof approach below fails.
618 * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access
619 * is good for performance. Do not do this unless you have tested the result
620 * and understand it.
621 */
622 # define png_alignof(type) (sizeof (type))
623 #else
624 # if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET
625 # define png_alignof(type) offsetof(struct{char c; type t;}, t)
626 # else
627 # if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS
628 # define png_alignof(type) (1)
629 # endif
630 /* Else leave png_alignof undefined to prevent use thereof */
631 # endif
632 #endif
633
634 /* This implicitly assumes alignment is always to a power of 2. */
635 #ifdef png_alignof
636 # define png_isaligned(ptr, type)\
637 (((type)((const char*)ptr-(const char*)0) & \
638 (type)(png_alignof(type)-1)) == 0)
639 #else
640 # define png_isaligned(ptr, type) 0
641 #endif
642
643 /* End of memory model/platform independent support */
644 /* End of 1.5.0beta36 move from pngconf.h */
645
646 /* CONSTANTS and UTILITY MACROS
647 * These are used internally by libpng and not exposed in the API
648 */
649
650 /* Various modes of operation. Note that after an init, mode is set to
651 * zero automatically when the structure is created. Three of these
652 * are defined in png.h because they need to be visible to applications
653 * that call png_set_unknown_chunk().
654 */
655 /* #define PNG_HAVE_IHDR 0x01U (defined in png.h) */
656 /* #define PNG_HAVE_PLTE 0x02U (defined in png.h) */
657 #define PNG_HAVE_IDAT 0x04U
658 /* #define PNG_AFTER_IDAT 0x08U (defined in png.h) */
659 #define PNG_HAVE_IEND 0x10U
660 /* 0x20U (unused) */
661 /* 0x40U (unused) */
662 /* 0x80U (unused) */
663 #define PNG_HAVE_CHUNK_HEADER 0x100U
664 #define PNG_WROTE_tIME 0x200U
665 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400U
666 #define PNG_BACKGROUND_IS_GRAY 0x800U
667 #define PNG_HAVE_PNG_SIGNATURE 0x1000U
668 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000U /* Have another chunk after IDAT */
669 /* 0x4000U (unused) */
670 #define PNG_IS_READ_STRUCT 0x8000U /* Else is a write struct */
671
672 /* Flags for the transformations the PNG library does on the image data */
673 #define PNG_BGR 0x0001U
674 #define PNG_INTERLACE 0x0002U
675 #define PNG_PACK 0x0004U
676 #define PNG_SHIFT 0x0008U
677 #define PNG_SWAP_BYTES 0x0010U
678 #define PNG_INVERT_MONO 0x0020U
679 #define PNG_QUANTIZE 0x0040U
680 #define PNG_COMPOSE 0x0080U /* Was PNG_BACKGROUND */
681 #define PNG_BACKGROUND_EXPAND 0x0100U
682 #define PNG_EXPAND_16 0x0200U /* Added to libpng 1.5.2 */
683 #define PNG_16_TO_8 0x0400U /* Becomes 'chop' in 1.5.4 */
684 #define PNG_RGBA 0x0800U
685 #define PNG_EXPAND 0x1000U
686 #define PNG_GAMMA 0x2000U
687 #define PNG_GRAY_TO_RGB 0x4000U
688 #define PNG_FILLER 0x8000U
689 #define PNG_PACKSWAP 0x10000U
690 #define PNG_SWAP_ALPHA 0x20000U
691 #define PNG_STRIP_ALPHA 0x40000U
692 #define PNG_INVERT_ALPHA 0x80000U
693 #define PNG_USER_TRANSFORM 0x100000U
694 #define PNG_RGB_TO_GRAY_ERR 0x200000U
695 #define PNG_RGB_TO_GRAY_WARN 0x400000U
696 #define PNG_RGB_TO_GRAY 0x600000U /* two bits, RGB_TO_GRAY_ERR|WARN */
697 #define PNG_ENCODE_ALPHA 0x800000U /* Added to libpng-1.5.4 */
698 #define PNG_ADD_ALPHA 0x1000000U /* Added to libpng-1.2.7 */
699 #define PNG_EXPAND_tRNS 0x2000000U /* Added to libpng-1.2.9 */
700 #define PNG_SCALE_16_TO_8 0x4000000U /* Added to libpng-1.5.4 */
701 /* 0x8000000U unused */
702 /* 0x10000000U unused */
703 /* 0x20000000U unused */
704 /* 0x40000000U unused */
705 /* Flags for png_create_struct */
706 #define PNG_STRUCT_PNG 0x0001U
707 #define PNG_STRUCT_INFO 0x0002U
708
709 /* Flags for the png_ptr->flags rather than declaring a byte for each one */
710 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001U
711 #define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002U /* Added to libpng-1.6.0 */
712 /* 0x0004U unused */
713 #define PNG_FLAG_ZSTREAM_ENDED 0x0008U /* Added to libpng-1.6.0 */
714 /* 0x0010U unused */
715 /* 0x0020U unused */
716 #define PNG_FLAG_ROW_INIT 0x0040U
717 #define PNG_FLAG_FILLER_AFTER 0x0080U
718 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100U
719 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200U
720 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400U
721 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800U
722 #define PNG_FLAG_ASSUME_sRGB 0x1000U /* Added to libpng-1.5.4 */
723 #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000U /* Added to libpng-1.5.4 */
724 #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000U /* Added to libpng-1.5.4 */
725 /* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000U */
726 /* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000U */
727 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000U
728 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000U
729 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000U
730 #define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000U /* Added to libpng-1.4.0 */
731 #define PNG_FLAG_APP_WARNINGS_WARN 0x200000U /* Added to libpng-1.6.0 */
732 #define PNG_FLAG_APP_ERRORS_WARN 0x400000U /* Added to libpng-1.6.0 */
733 /* 0x800000U unused */
734 /* 0x1000000U unused */
735 /* 0x2000000U unused */
736 /* 0x4000000U unused */
737 /* 0x8000000U unused */
738 /* 0x10000000U unused */
739 /* 0x20000000U unused */
740 /* 0x40000000U unused */
741
742 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
743 PNG_FLAG_CRC_ANCILLARY_NOWARN)
744
745 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
746 PNG_FLAG_CRC_CRITICAL_IGNORE)
747
748 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
749 PNG_FLAG_CRC_CRITICAL_MASK)
750
751 /* Save typing and make code easier to understand */
752
753 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
754 abs((int)((c1).green) - (int)((c2).green)) + \
755 abs((int)((c1).blue) - (int)((c2).blue)))
756
757 /* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255
758 * by dividing by 257 *with rounding*. This macro is exact for the given range.
759 * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the
760 * macro were established by experiment (modifying the added value). The macro
761 * has a second variant that takes a value already scaled by 255 and divides by
762 * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it
763 * only gives off-by-one errors and only for 0.5% (1 in 200) of the values.
764 */
765 #define PNG_DIV65535(v24) (((v24) + 32895) >> 16)
766 #define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255)
767
768 /* Added to libpng-1.2.6 JB */
769 #define PNG_ROWBYTES(pixel_bits, width) \
770 ((pixel_bits) >= 8 ? \
771 ((size_t)(width) * (((size_t)(pixel_bits)) >> 3)) : \
772 (( ((size_t)(width) * ((size_t)(pixel_bits))) + 7) >> 3) )
773
774 /* This returns the number of trailing bits in the last byte of a row, 0 if the
775 * last byte is completely full of pixels. It is, in principle, (pixel_bits x
776 * width) % 8, but that would overflow for large 'width'. The second macro is
777 * the same except that it returns the number of unused bits in the last byte;
778 * (8-TRAILBITS), but 0 when TRAILBITS is 0.
779 *
780 * NOTE: these macros are intended to be self-evidently correct and never
781 * overflow on the assumption that pixel_bits is in the range 0..255. The
782 * arguments are evaluated only once and they can be signed (e.g. as a result of
783 * the integral promotions). The result of the expression always has type
784 * (png_uint_32), however the compiler always knows it is in the range 0..7.
785 */
786 #define PNG_TRAILBITS(pixel_bits, width) \
787 (((pixel_bits) * ((width) % (png_uint_32)8)) % 8)
788
789 #define PNG_PADBITS(pixel_bits, width) \
790 ((8 - PNG_TRAILBITS(pixel_bits, width)) % 8)
791
792 /* PNG_OUT_OF_RANGE returns true if value is outside the range
793 * ideal-delta..ideal+delta. Each argument is evaluated twice.
794 * "ideal" and "delta" should be constants, normally simple
795 * integers, "value" a variable. Added to libpng-1.2.6 JB
796 */
797 #define PNG_OUT_OF_RANGE(value, ideal, delta) \
798 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
799
800 /* Conversions between fixed and floating point, only defined if
801 * required (to make sure the code doesn't accidentally use float
802 * when it is supposedly disabled.)
803 */
804 #ifdef PNG_FLOATING_POINT_SUPPORTED
805 /* The floating point conversion can't overflow, though it can and
806 * does lose accuracy relative to the original fixed point value.
807 * In practice this doesn't matter because png_fixed_point only
808 * stores numbers with very low precision. The png_ptr and s
809 * arguments are unused by default but are there in case error
810 * checking becomes a requirement.
811 */
812 #define png_float(png_ptr, fixed, s) (.00001 * (fixed))
813
814 /* The fixed point conversion performs range checking and evaluates
815 * its argument multiple times, so must be used with care. The
816 * range checking uses the PNG specification values for a signed
817 * 32-bit fixed point value except that the values are deliberately
818 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly
819 * (2^31-1) * 100000). 's' is a string that describes the value being
820 * converted.
821 *
822 * NOTE: this macro will raise a png_error if the range check fails,
823 * therefore it is normally only appropriate to use this on values
824 * that come from API calls or other sources where an out of range
825 * error indicates a programming error, not a data error!
826 *
827 * NOTE: by default this is off - the macro is not used - because the
828 * function call saves a lot of code.
829 */
830 #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED
831 #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\
832 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0))
833 #endif
834 /* else the corresponding function is defined below, inside the scope of the
835 * cplusplus test.
836 */
837 #endif
838
839 /* Constants for known chunk types. If you need to add a chunk, define the name
840 * here. For historical reasons these constants have the form png_<name>; i.e.
841 * the prefix is lower case. Please use decimal values as the parameters to
842 * match the ISO PNG specification and to avoid relying on the C locale
843 * interpretation of character values.
844 *
845 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values
846 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string
847 * to be generated if required.
848 *
849 * PNG_32b correctly produces a value shifted by up to 24 bits, even on
850 * architectures where (int) is only 16 bits.
851 */
852 #define PNG_32b(b,s) ((png_uint_32)(b) << (s))
853 #define PNG_U32(b1,b2,b3,b4) \
854 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0))
855
856 /* Constants for known chunk types.
857 *
858 * MAINTAINERS: If you need to add a chunk, define the name here.
859 * For historical reasons these constants have the form png_<name>; i.e.
860 * the prefix is lower case. Please use decimal values as the parameters to
861 * match the ISO PNG specification and to avoid relying on the C locale
862 * interpretation of character values. Please keep the list sorted.
863 *
864 * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk
865 * type. In fact the specification does not express chunk types this way,
866 * however using a 32-bit value means that the chunk type can be read from the
867 * stream using exactly the same code as used for a 32-bit unsigned value and
868 * can be examined far more efficiently (using one arithmetic compare).
869 *
870 * Prior to 1.5.6 the chunk type constants were expressed as C strings. The
871 * libpng API still uses strings for 'unknown' chunks and a macro,
872 * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice
873 * that for portable code numeric values must still be used; the string "IHDR"
874 * is not portable and neither is PNG_U32('I', 'H', 'D', 'R').
875 *
876 * In 1.7.0 the definitions will be made public in png.h to avoid having to
877 * duplicate the same definitions in application code.
878 */
879 #define png_IDAT PNG_U32( 73, 68, 65, 84)
880 #define png_IEND PNG_U32( 73, 69, 78, 68)
881 #define png_IHDR PNG_U32( 73, 72, 68, 82)
882 #define png_PLTE PNG_U32( 80, 76, 84, 69)
883 #define png_bKGD PNG_U32( 98, 75, 71, 68)
884 #define png_cHRM PNG_U32( 99, 72, 82, 77)
885 #define png_eXIf PNG_U32(101, 88, 73, 102) /* registered July 2017 */
886 #define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */
887 #define png_gAMA PNG_U32(103, 65, 77, 65)
888 #define png_gIFg PNG_U32(103, 73, 70, 103)
889 #define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */
890 #define png_gIFx PNG_U32(103, 73, 70, 120)
891 #define png_hIST PNG_U32(104, 73, 83, 84)
892 #define png_iCCP PNG_U32(105, 67, 67, 80)
893 #define png_iTXt PNG_U32(105, 84, 88, 116)
894 #define png_oFFs PNG_U32(111, 70, 70, 115)
895 #define png_pCAL PNG_U32(112, 67, 65, 76)
896 #define png_pHYs PNG_U32(112, 72, 89, 115)
897 #define png_sBIT PNG_U32(115, 66, 73, 84)
898 #define png_sCAL PNG_U32(115, 67, 65, 76)
899 #define png_sPLT PNG_U32(115, 80, 76, 84)
900 #define png_sRGB PNG_U32(115, 82, 71, 66)
901 #define png_sTER PNG_U32(115, 84, 69, 82)
902 #define png_tEXt PNG_U32(116, 69, 88, 116)
903 #define png_tIME PNG_U32(116, 73, 77, 69)
904 #define png_tRNS PNG_U32(116, 82, 78, 83)
905 #define png_zTXt PNG_U32(122, 84, 88, 116)
906
907 /* The following will work on (signed char*) strings, whereas the get_uint_32
908 * macro will fail on top-bit-set values because of the sign extension.
909 */
910 #define PNG_CHUNK_FROM_STRING(s)\
911 PNG_U32(0xff & (s)[0], 0xff & (s)[1], 0xff & (s)[2], 0xff & (s)[3])
912
913 /* This uses (char), not (png_byte) to avoid warnings on systems where (char) is
914 * signed and the argument is a (char[]) This macro will fail miserably on
915 * systems where (char) is more than 8 bits.
916 */
917 #define PNG_STRING_FROM_CHUNK(s,c)\
918 (void)(((char*)(s))[0]=(char)(((c)>>24) & 0xff), \
919 ((char*)(s))[1]=(char)(((c)>>16) & 0xff),\
920 ((char*)(s))[2]=(char)(((c)>>8) & 0xff), \
921 ((char*)(s))[3]=(char)((c & 0xff)))
922
923 /* Do the same but terminate with a null character. */
924 #define PNG_CSTRING_FROM_CHUNK(s,c)\
925 (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0)
926
927 /* Test on flag values as defined in the spec (section 5.4): */
928 #define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29))
929 #define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c))
930 #define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21))
931 #define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13))
932 #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5))
933
934 /* Gamma values (new at libpng-1.5.4): */
935 #define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */
936 #define PNG_GAMMA_MAC_INVERSE 65909
937 #define PNG_GAMMA_sRGB_INVERSE 45455
938
939 /* Almost everything below is C specific; the #defines above can be used in
940 * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot.
941 */
942 #ifndef PNG_VERSION_INFO_ONLY
943
944 #include "pngstruct.h"
945 #include "pnginfo.h"
946
947 /* Validate the include paths - the include path used to generate pnglibconf.h
948 * must match that used in the build, or we must be using pnglibconf.h.prebuilt:
949 */
950 #if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM
951 # error ZLIB_VERNUM != PNG_ZLIB_VERNUM \
952 "-I (include path) error: see the notes in pngpriv.h"
953 /* This means that when pnglibconf.h was built the copy of zlib.h that it
954 * used is not the same as the one being used here. Because the build of
955 * libpng makes decisions to use inflateInit2 and inflateReset2 based on the
956 * zlib version number and because this affects handling of certain broken
957 * PNG files the -I directives must match.
958 *
959 * The most likely explanation is that you passed a -I in CFLAGS. This will
960 * not work; all the preprocessor directives and in particular all the -I
961 * directives must be in CPPFLAGS.
962 */
963 #endif
964
965 /* This is used for 16-bit gamma tables -- only the top level pointers are
966 * const; this could be changed:
967 */
968 typedef const png_uint_16p * png_const_uint_16pp;
969
970 /* Added to libpng-1.5.7: sRGB conversion tables */
971 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
972 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
973 #ifdef PNG_SIMPLIFIED_READ_SUPPORTED
974 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]);
975 /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value,
976 * 0..65535. This table gives the closest 16-bit answers (no errors).
977 */
978 #endif
979
980 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]);
981 PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]);
982
983 #define PNG_sRGB_FROM_LINEAR(linear) \
984 ((png_byte)(0xff & ((png_sRGB_base[(linear)>>15] \
985 + ((((linear) & 0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8)))
986 /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB
987 * encoded value with maximum error 0.646365. Note that the input is not a
988 * 16-bit value; it has been multiplied by 255! */
989 #endif /* SIMPLIFIED_READ/WRITE */
990
991
992 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */
993 #ifdef __cplusplus
994 extern "C" {
995 #endif /* __cplusplus */
996
997 /* Internal functions; these are not exported from a DLL however because they
998 * are used within several of the C source files they have to be C extern.
999 *
1000 * All of these functions must be declared with PNG_INTERNAL_FUNCTION.
1001 */
1002
1003 /* Zlib support */
1004 #define PNG_UNEXPECTED_ZLIB_RETURN (-7)
1005 PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret),
1006 PNG_EMPTY);
1007 /* Used by the zlib handling functions to ensure that z_stream::msg is always
1008 * set before they return.
1009 */
1010
1011 #ifdef PNG_WRITE_SUPPORTED
1012 PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr,
1013 png_compression_bufferp *list),PNG_EMPTY);
1014 /* Free the buffer list used by the compressed write code. */
1015 #endif
1016
1017 #if defined(PNG_FLOATING_POINT_SUPPORTED) && \
1018 !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \
1019 (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \
1020 defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \
1021 defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \
1022 (defined(PNG_sCAL_SUPPORTED) && \
1023 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED))
1024 PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr,
1025 double fp, png_const_charp text),PNG_EMPTY);
1026 #endif
1027
1028 /* Check the user version string for compatibility, returns false if the version
1029 * numbers aren't compatible.
1030 */
1031 PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr,
1032 png_const_charp user_png_ver),PNG_EMPTY);
1033
1034 /* Internal base allocator - no messages, NULL on failure to allocate. This
1035 * does, however, call the application provided allocator and that could call
1036 * png_error (although that would be a bug in the application implementation.)
1037 */
1038 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr,
1039 png_alloc_size_t size),PNG_ALLOCATED);
1040
1041 #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\
1042 defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED)
1043 /* Internal array allocator, outputs no error or warning messages on failure,
1044 * just returns NULL.
1045 */
1046 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr,
1047 int nelements, size_t element_size),PNG_ALLOCATED);
1048
1049 /* The same but an existing array is extended by add_elements. This function
1050 * also memsets the new elements to 0 and copies the old elements. The old
1051 * array is not freed or altered.
1052 */
1053 PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr,
1054 png_const_voidp array, int old_elements, int add_elements,
1055 size_t element_size),PNG_ALLOCATED);
1056 #endif /* text, sPLT or unknown chunks */
1057
1058 /* Magic to create a struct when there is no struct to call the user supplied
1059 * memory allocators. Because error handling has not been set up the memory
1060 * handlers can't safely call png_error, but this is an obscure and undocumented
1061 * restriction so libpng has to assume that the 'free' handler, at least, might
1062 * call png_error.
1063 */
1064 PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct,
1065 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
1066 png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn,
1067 png_free_ptr free_fn),PNG_ALLOCATED);
1068
1069 /* Free memory from internal libpng struct */
1070 PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr),
1071 PNG_EMPTY);
1072
1073 /* Free an allocated jmp_buf (always succeeds) */
1074 PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY);
1075
1076 /* Function to allocate memory for zlib. PNGAPI is disallowed. */
1077 PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size),
1078 PNG_ALLOCATED);
1079
1080 /* Function to free memory for zlib. PNGAPI is disallowed. */
1081 PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY);
1082
1083 /* Next four functions are used internally as callbacks. PNGCBAPI is required
1084 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to
1085 * PNGCBAPI at 1.5.0
1086 */
1087
1088 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr,
1089 png_bytep data, size_t length),PNG_EMPTY);
1090
1091 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1092 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr,
1093 png_bytep buffer, size_t length),PNG_EMPTY);
1094 #endif
1095
1096 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr,
1097 png_bytep data, size_t length),PNG_EMPTY);
1098
1099 #ifdef PNG_WRITE_FLUSH_SUPPORTED
1100 # ifdef PNG_STDIO_SUPPORTED
1101 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr),
1102 PNG_EMPTY);
1103 # endif
1104 #endif
1105
1106 /* Reset the CRC variable */
1107 PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY);
1108
1109 /* Write the "data" buffer to whatever output you are using */
1110 PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr,
1111 png_const_bytep data, size_t length),PNG_EMPTY);
1112
1113 /* Read and check the PNG file signature */
1114 PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr,
1115 png_inforp info_ptr),PNG_EMPTY);
1116
1117 /* Read the chunk header (length + type name) */
1118 PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr),
1119 PNG_EMPTY);
1120
1121 /* Read data from whatever input you are using into the "data" buffer */
1122 PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data,
1123 size_t length),PNG_EMPTY);
1124
1125 /* Read bytes into buf, and update png_ptr->crc */
1126 PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf,
1127 png_uint_32 length),PNG_EMPTY);
1128
1129 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
1130 PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr,
1131 png_uint_32 skip),PNG_EMPTY);
1132
1133 /* Read the CRC from the file and compare it to the libpng calculated CRC */
1134 PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY);
1135
1136 /* Calculate the CRC over a section of data. Note that we are only
1137 * passing a maximum of 64K on systems that have this as a memory limit,
1138 * since this is the maximum buffer size we can specify.
1139 */
1140 PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr,
1141 png_const_bytep ptr, size_t length),PNG_EMPTY);
1142
1143 #ifdef PNG_WRITE_FLUSH_SUPPORTED
1144 PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY);
1145 #endif
1146
1147 /* Write various chunks */
1148
1149 /* Write the IHDR chunk, and update the png_struct with the necessary
1150 * information.
1151 */
1152 PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr,
1153 png_uint_32 width, png_uint_32 height, int bit_depth, int color_type,
1154 int compression_method, int filter_method, int interlace_method),PNG_EMPTY);
1155
1156 PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr,
1157 png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY);
1158
1159 PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr,
1160 png_const_bytep row_data, png_alloc_size_t row_data_length, int flush),
1161 PNG_EMPTY);
1162
1163 PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY);
1164
1165 #ifdef PNG_WRITE_gAMA_SUPPORTED
1166 PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr,
1167 png_fixed_point file_gamma),PNG_EMPTY);
1168 #endif
1169
1170 #ifdef PNG_WRITE_sBIT_SUPPORTED
1171 PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr,
1172 png_const_color_8p sbit, int color_type),PNG_EMPTY);
1173 #endif
1174
1175 #ifdef PNG_WRITE_cHRM_SUPPORTED
1176 PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr,
1177 const png_xy *xy), PNG_EMPTY);
1178 /* The xy value must have been previously validated */
1179 #endif
1180
1181 #ifdef PNG_WRITE_sRGB_SUPPORTED
1182 PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr,
1183 int intent),PNG_EMPTY);
1184 #endif
1185
1186 #ifdef PNG_WRITE_eXIf_SUPPORTED
1187 PNG_INTERNAL_FUNCTION(void,png_write_eXIf,(png_structrp png_ptr,
1188 png_bytep exif, int num_exif),PNG_EMPTY);
1189 #endif
1190
1191 #ifdef PNG_WRITE_iCCP_SUPPORTED
1192 PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr,
1193 png_const_charp name, png_const_bytep profile), PNG_EMPTY);
1194 /* The profile must have been previously validated for correctness, the
1195 * length comes from the first four bytes. Only the base, deflate,
1196 * compression is supported.
1197 */
1198 #endif
1199
1200 #ifdef PNG_WRITE_sPLT_SUPPORTED
1201 PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr,
1202 png_const_sPLT_tp palette),PNG_EMPTY);
1203 #endif
1204
1205 #ifdef PNG_WRITE_tRNS_SUPPORTED
1206 PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr,
1207 png_const_bytep trans, png_const_color_16p values, int number,
1208 int color_type),PNG_EMPTY);
1209 #endif
1210
1211 #ifdef PNG_WRITE_bKGD_SUPPORTED
1212 PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr,
1213 png_const_color_16p values, int color_type),PNG_EMPTY);
1214 #endif
1215
1216 #ifdef PNG_WRITE_hIST_SUPPORTED
1217 PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr,
1218 png_const_uint_16p hist, int num_hist),PNG_EMPTY);
1219 #endif
1220
1221 /* Chunks that have keywords */
1222 #ifdef PNG_WRITE_tEXt_SUPPORTED
1223 PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr,
1224 png_const_charp key, png_const_charp text, size_t text_len),PNG_EMPTY);
1225 #endif
1226
1227 #ifdef PNG_WRITE_zTXt_SUPPORTED
1228 PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp
1229 key, png_const_charp text, int compression),PNG_EMPTY);
1230 #endif
1231
1232 #ifdef PNG_WRITE_iTXt_SUPPORTED
1233 PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr,
1234 int compression, png_const_charp key, png_const_charp lang,
1235 png_const_charp lang_key, png_const_charp text),PNG_EMPTY);
1236 #endif
1237
1238 #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */
1239 PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr,
1240 png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY);
1241 #endif
1242
1243 #ifdef PNG_WRITE_oFFs_SUPPORTED
1244 PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr,
1245 png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY);
1246 #endif
1247
1248 #ifdef PNG_WRITE_pCAL_SUPPORTED
1249 PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr,
1250 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
1251 png_const_charp units, png_charpp params),PNG_EMPTY);
1252 #endif
1253
1254 #ifdef PNG_WRITE_pHYs_SUPPORTED
1255 PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr,
1256 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
1257 int unit_type),PNG_EMPTY);
1258 #endif
1259
1260 #ifdef PNG_WRITE_tIME_SUPPORTED
1261 PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr,
1262 png_const_timep mod_time),PNG_EMPTY);
1263 #endif
1264
1265 #ifdef PNG_WRITE_sCAL_SUPPORTED
1266 PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr,
1267 int unit, png_const_charp width, png_const_charp height),PNG_EMPTY);
1268 #endif
1269
1270 /* Called when finished processing a row of data */
1271 PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr),
1272 PNG_EMPTY);
1273
1274 /* Internal use only. Called before first row of data */
1275 PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr),
1276 PNG_EMPTY);
1277
1278 /* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an
1279 * array of png_ptr->width pixels. If the image is not interlaced or this
1280 * is the final pass this just does a memcpy, otherwise the "display" flag
1281 * is used to determine whether to copy pixels that are not in the current pass.
1282 *
1283 * Because 'png_do_read_interlace' (below) replicates pixels this allows this
1284 * function to achieve the documented 'blocky' appearance during interlaced read
1285 * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row'
1286 * are not changed if they are not in the current pass, when display is 0.
1287 *
1288 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless.
1289 *
1290 * The API always reads from the png_struct row buffer and always assumes that
1291 * it is full width (png_do_read_interlace has already been called.)
1292 *
1293 * This function is only ever used to write to row buffers provided by the
1294 * caller of the relevant libpng API and the row must have already been
1295 * transformed by the read transformations.
1296 *
1297 * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed
1298 * bitmasks for use within the code, otherwise runtime generated masks are used.
1299 * The default is compile time masks.
1300 */
1301 #ifndef PNG_USE_COMPILE_TIME_MASKS
1302 # define PNG_USE_COMPILE_TIME_MASKS 1
1303 #endif
1304 PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr,
1305 png_bytep row, int display),PNG_EMPTY);
1306
1307 #ifdef PNG_READ_INTERLACING_SUPPORTED
1308 /* Expand an interlaced row: the 'row_info' describes the pass data that has
1309 * been read in and must correspond to the pixels in 'row', the pixels are
1310 * expanded (moved apart) in 'row' to match the final layout, when doing this
1311 * the pixels are *replicated* to the intervening space. This is essential for
1312 * the correct operation of png_combine_row, above.
1313 */
1314 PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info,
1315 png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY);
1316 #endif
1317
1318 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
1319
1320 #ifdef PNG_WRITE_INTERLACING_SUPPORTED
1321 /* Grab pixels out of a row for an interlaced pass */
1322 PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info,
1323 png_bytep row, int pass),PNG_EMPTY);
1324 #endif
1325
1326 /* Unfilter a row: check the filter value before calling this, there is no point
1327 * calling it for PNG_FILTER_VALUE_NONE.
1328 */
1329 PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop
1330 row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY);
1331
1332 #if PNG_ARM_NEON_OPT > 0
1333 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info,
1334 png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1335 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop
1336 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1337 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop
1338 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1339 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop
1340 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1341 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop
1342 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1343 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop
1344 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1345 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop
1346 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1347 #endif
1348
1349 #if PNG_MIPS_MSA_OPT > 0
1350 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_msa,(png_row_infop row_info,
1351 png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1352 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_msa,(png_row_infop
1353 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1354 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_msa,(png_row_infop
1355 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1356 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_msa,(png_row_infop
1357 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1358 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_msa,(png_row_infop
1359 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1360 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_msa,(png_row_infop
1361 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1362 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_msa,(png_row_infop
1363 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1364 #endif
1365
1366 #if PNG_POWERPC_VSX_OPT > 0
1367 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_vsx,(png_row_infop row_info,
1368 png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1369 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_vsx,(png_row_infop
1370 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1371 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_vsx,(png_row_infop
1372 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1373 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_vsx,(png_row_infop
1374 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1375 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_vsx,(png_row_infop
1376 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1377 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_vsx,(png_row_infop
1378 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1379 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_vsx,(png_row_infop
1380 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1381 #endif
1382
1383 #if PNG_INTEL_SSE_IMPLEMENTATION > 0
1384 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_sse2,(png_row_infop
1385 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1386 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_sse2,(png_row_infop
1387 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1388 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_sse2,(png_row_infop
1389 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1390 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_sse2,(png_row_infop
1391 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1392 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_sse2,(png_row_infop
1393 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1394 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_sse2,(png_row_infop
1395 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1396 #endif
1397
1398 /* Choose the best filter to use and filter the row data */
1399 PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr,
1400 png_row_infop row_info),PNG_EMPTY);
1401
1402 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1403 PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr,
1404 png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY);
1405 /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer
1406 * is NULL the function checks, instead, for the end of the stream. In this
1407 * case a benign error will be issued if the stream end is not found or if
1408 * extra data has to be consumed.
1409 */
1410 PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr),
1411 PNG_EMPTY);
1412 /* This cleans up when the IDAT LZ stream does not end when the last image
1413 * byte is read; there is still some pending input.
1414 */
1415
1416 PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr),
1417 PNG_EMPTY);
1418 /* Finish a row while reading, dealing with interlacing passes, etc. */
1419 #endif /* SEQUENTIAL_READ */
1420
1421 /* Initialize the row buffers, etc. */
1422 PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY);
1423
1424 #if ZLIB_VERNUM >= 0x1240
1425 PNG_INTERNAL_FUNCTION(int,png_zlib_inflate,(png_structrp png_ptr, int flush),
1426 PNG_EMPTY);
1427 # define PNG_INFLATE(pp, flush) png_zlib_inflate(pp, flush)
1428 #else /* Zlib < 1.2.4 */
1429 # define PNG_INFLATE(pp, flush) inflate(&(pp)->zstream, flush)
1430 #endif /* Zlib < 1.2.4 */
1431
1432 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
1433 /* Optional call to update the users info structure */
1434 PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr,
1435 png_inforp info_ptr),PNG_EMPTY);
1436 #endif
1437
1438 /* Shared transform functions, defined in pngtran.c */
1439 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
1440 defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
1441 PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info,
1442 png_bytep row, int at_start),PNG_EMPTY);
1443 #endif
1444
1445 #ifdef PNG_16BIT_SUPPORTED
1446 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
1447 PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info,
1448 png_bytep row),PNG_EMPTY);
1449 #endif
1450 #endif
1451
1452 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
1453 defined(PNG_WRITE_PACKSWAP_SUPPORTED)
1454 PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info,
1455 png_bytep row),PNG_EMPTY);
1456 #endif
1457
1458 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
1459 PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info,
1460 png_bytep row),PNG_EMPTY);
1461 #endif
1462
1463 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
1464 PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info,
1465 png_bytep row),PNG_EMPTY);
1466 #endif
1467
1468 /* The following decodes the appropriate chunks, and does error correction,
1469 * then calls the appropriate callback for the chunk if it is valid.
1470 */
1471
1472 /* Decode the IHDR chunk */
1473 PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr,
1474 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1475 PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr,
1476 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1477 PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr,
1478 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1479
1480 #ifdef PNG_READ_bKGD_SUPPORTED
1481 PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr,
1482 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1483 #endif
1484
1485 #ifdef PNG_READ_cHRM_SUPPORTED
1486 PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr,
1487 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1488 #endif
1489
1490 #ifdef PNG_READ_eXIf_SUPPORTED
1491 PNG_INTERNAL_FUNCTION(void,png_handle_eXIf,(png_structrp png_ptr,
1492 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1493 #endif
1494
1495 #ifdef PNG_READ_gAMA_SUPPORTED
1496 PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr,
1497 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1498 #endif
1499
1500 #ifdef PNG_READ_hIST_SUPPORTED
1501 PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr,
1502 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1503 #endif
1504
1505 #ifdef PNG_READ_iCCP_SUPPORTED
1506 PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr,
1507 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1508 #endif /* READ_iCCP */
1509
1510 #ifdef PNG_READ_iTXt_SUPPORTED
1511 PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr,
1512 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1513 #endif
1514
1515 #ifdef PNG_READ_oFFs_SUPPORTED
1516 PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr,
1517 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1518 #endif
1519
1520 #ifdef PNG_READ_pCAL_SUPPORTED
1521 PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr,
1522 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1523 #endif
1524
1525 #ifdef PNG_READ_pHYs_SUPPORTED
1526 PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr,
1527 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1528 #endif
1529
1530 #ifdef PNG_READ_sBIT_SUPPORTED
1531 PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr,
1532 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1533 #endif
1534
1535 #ifdef PNG_READ_sCAL_SUPPORTED
1536 PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr,
1537 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1538 #endif
1539
1540 #ifdef PNG_READ_sPLT_SUPPORTED
1541 PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr,
1542 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1543 #endif /* READ_sPLT */
1544
1545 #ifdef PNG_READ_sRGB_SUPPORTED
1546 PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr,
1547 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1548 #endif
1549
1550 #ifdef PNG_READ_tEXt_SUPPORTED
1551 PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr,
1552 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1553 #endif
1554
1555 #ifdef PNG_READ_tIME_SUPPORTED
1556 PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr,
1557 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1558 #endif
1559
1560 #ifdef PNG_READ_tRNS_SUPPORTED
1561 PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr,
1562 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1563 #endif
1564
1565 #ifdef PNG_READ_zTXt_SUPPORTED
1566 PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr,
1567 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1568 #endif
1569
1570 PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_const_structrp png_ptr,
1571 png_uint_32 chunk_name),PNG_EMPTY);
1572
1573 PNG_INTERNAL_FUNCTION(void,png_check_chunk_length,(png_const_structrp png_ptr,
1574 png_uint_32 chunk_length),PNG_EMPTY);
1575
1576 PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr,
1577 png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY);
1578 /* This is the function that gets called for unknown chunks. The 'keep'
1579 * argument is either non-zero for a known chunk that has been set to be
1580 * handled as unknown or zero for an unknown chunk. By default the function
1581 * just skips the chunk or errors out if it is critical.
1582 */
1583
1584 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\
1585 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
1586 PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling,
1587 (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY);
1588 /* Exactly as the API png_handle_as_unknown() except that the argument is a
1589 * 32-bit chunk name, not a string.
1590 */
1591 #endif /* READ_UNKNOWN_CHUNKS || HANDLE_AS_UNKNOWN */
1592
1593 /* Handle the transformations for reading and writing */
1594 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
1595 PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr,
1596 png_row_infop row_info),PNG_EMPTY);
1597 #endif
1598 #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
1599 PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr,
1600 png_row_infop row_info),PNG_EMPTY);
1601 #endif
1602
1603 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
1604 PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr),
1605 PNG_EMPTY);
1606 #endif
1607
1608 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1609 PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr,
1610 png_inforp info_ptr),PNG_EMPTY);
1611 PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr,
1612 png_inforp info_ptr),PNG_EMPTY);
1613 PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY);
1614 PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr),
1615 PNG_EMPTY);
1616 PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr,
1617 png_bytep buffer, size_t buffer_length),PNG_EMPTY);
1618 PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY);
1619 PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr,
1620 png_bytep buffer, size_t buffer_length),PNG_EMPTY);
1621 PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr),
1622 PNG_EMPTY);
1623 PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr,
1624 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1625 PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr,
1626 png_inforp info_ptr),PNG_EMPTY);
1627 PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr,
1628 png_inforp info_ptr),PNG_EMPTY);
1629 PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr,
1630 png_bytep row),PNG_EMPTY);
1631 PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr,
1632 png_inforp info_ptr),PNG_EMPTY);
1633 PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr,
1634 png_inforp info_ptr),PNG_EMPTY);
1635 PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr),
1636 PNG_EMPTY);
1637 # ifdef PNG_READ_tEXt_SUPPORTED
1638 PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr,
1639 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1640 PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr,
1641 png_inforp info_ptr),PNG_EMPTY);
1642 # endif
1643 # ifdef PNG_READ_zTXt_SUPPORTED
1644 PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr,
1645 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1646 PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr,
1647 png_inforp info_ptr),PNG_EMPTY);
1648 # endif
1649 # ifdef PNG_READ_iTXt_SUPPORTED
1650 PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr,
1651 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1652 PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr,
1653 png_inforp info_ptr),PNG_EMPTY);
1654 # endif
1655
1656 #endif /* PROGRESSIVE_READ */
1657
1658 /* Added at libpng version 1.6.0 */
1659 #ifdef PNG_GAMMA_SUPPORTED
1660 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr,
1661 png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY);
1662 /* Set the colorspace gamma with a value provided by the application or by
1663 * the gAMA chunk on read. The value will override anything set by an ICC
1664 * profile.
1665 */
1666
1667 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr,
1668 png_inforp info_ptr), PNG_EMPTY);
1669 /* Synchronize the info 'valid' flags with the colorspace */
1670
1671 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr,
1672 png_inforp info_ptr), PNG_EMPTY);
1673 /* Copy the png_struct colorspace to the info_struct and call the above to
1674 * synchronize the flags. Checks for NULL info_ptr and does nothing.
1675 */
1676 #endif
1677
1678 /* Added at libpng version 1.4.0 */
1679 #ifdef PNG_COLORSPACE_SUPPORTED
1680 /* These internal functions are for maintaining the colorspace structure within
1681 * a png_info or png_struct (or, indeed, both).
1682 */
1683 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities,
1684 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy,
1685 int preferred), PNG_EMPTY);
1686
1687 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints,
1688 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ,
1689 int preferred), PNG_EMPTY);
1690
1691 #ifdef PNG_sRGB_SUPPORTED
1692 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr,
1693 png_colorspacerp colorspace, int intent), PNG_EMPTY);
1694 /* This does set the colorspace gAMA and cHRM values too, but doesn't set the
1695 * flags to write them, if it returns false there was a problem and an error
1696 * message has already been output (but the colorspace may still need to be
1697 * synced to record the invalid flag).
1698 */
1699 #endif /* sRGB */
1700
1701 #ifdef PNG_iCCP_SUPPORTED
1702 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr,
1703 png_colorspacerp colorspace, png_const_charp name,
1704 png_uint_32 profile_length, png_const_bytep profile, int color_type),
1705 PNG_EMPTY);
1706 /* The 'name' is used for information only */
1707
1708 /* Routines for checking parts of an ICC profile. */
1709 #ifdef PNG_READ_iCCP_SUPPORTED
1710 PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr,
1711 png_colorspacerp colorspace, png_const_charp name,
1712 png_uint_32 profile_length), PNG_EMPTY);
1713 #endif /* READ_iCCP */
1714 PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr,
1715 png_colorspacerp colorspace, png_const_charp name,
1716 png_uint_32 profile_length,
1717 png_const_bytep profile /* first 132 bytes only */, int color_type),
1718 PNG_EMPTY);
1719 PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr,
1720 png_colorspacerp colorspace, png_const_charp name,
1721 png_uint_32 profile_length,
1722 png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY);
1723 #ifdef PNG_sRGB_SUPPORTED
1724 PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,(
1725 png_const_structrp png_ptr, png_colorspacerp colorspace,
1726 png_const_bytep profile, uLong adler), PNG_EMPTY);
1727 /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may
1728 * be zero to indicate that it is not available. It is used, if provided,
1729 * as a fast check on the profile when checking to see if it is sRGB.
1730 */
1731 #endif
1732 #endif /* iCCP */
1733
1734 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
1735 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients,
1736 (png_structrp png_ptr), PNG_EMPTY);
1737 /* Set the rgb_to_gray coefficients from the colorspace Y values */
1738 #endif /* READ_RGB_TO_GRAY */
1739 #endif /* COLORSPACE */
1740
1741 /* Added at libpng version 1.4.0 */
1742 PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr,
1743 png_uint_32 width, png_uint_32 height, int bit_depth,
1744 int color_type, int interlace_type, int compression_type,
1745 int filter_type),PNG_EMPTY);
1746
1747 /* Added at libpng version 1.5.10 */
1748 #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \
1749 defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED)
1750 PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes,
1751 (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY);
1752 #endif
1753
1754 #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
1755 PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr,
1756 png_const_charp name),PNG_NORETURN);
1757 #endif
1758
1759 /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite
1760 * the end. Always leaves the buffer nul terminated. Never errors out (and
1761 * there is no error code.)
1762 */
1763 PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize,
1764 size_t pos, png_const_charp string),PNG_EMPTY);
1765
1766 /* Various internal functions to handle formatted warning messages, currently
1767 * only implemented for warnings.
1768 */
1769 #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)
1770 /* Utility to dump an unsigned value into a buffer, given a start pointer and
1771 * and end pointer (which should point just *beyond* the end of the buffer!)
1772 * Returns the pointer to the start of the formatted string. This utility only
1773 * does unsigned values.
1774 */
1775 PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start,
1776 png_charp end, int format, png_alloc_size_t number),PNG_EMPTY);
1777
1778 /* Convenience macro that takes an array: */
1779 #define PNG_FORMAT_NUMBER(buffer,format,number) \
1780 png_format_number(buffer, buffer + (sizeof buffer), format, number)
1781
1782 /* Suggested size for a number buffer (enough for 64 bits and a sign!) */
1783 #define PNG_NUMBER_BUFFER_SIZE 24
1784
1785 /* These are the integer formats currently supported, the name is formed from
1786 * the standard printf(3) format string.
1787 */
1788 #define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */
1789 #define PNG_NUMBER_FORMAT_02u 2
1790 #define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */
1791 #define PNG_NUMBER_FORMAT_02d 2
1792 #define PNG_NUMBER_FORMAT_x 3
1793 #define PNG_NUMBER_FORMAT_02x 4
1794 #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */
1795 #endif
1796
1797 #ifdef PNG_WARNINGS_SUPPORTED
1798 /* New defines and members adding in libpng-1.5.4 */
1799 # define PNG_WARNING_PARAMETER_SIZE 32
1800 # define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */
1801
1802 /* An l-value of this type has to be passed to the APIs below to cache the
1803 * values of the parameters to a formatted warning message.
1804 */
1805 typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][
1806 PNG_WARNING_PARAMETER_SIZE];
1807
1808 PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p,
1809 int number, png_const_charp string),PNG_EMPTY);
1810 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters,
1811 * including the trailing '\0'.
1812 */
1813 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned,
1814 (png_warning_parameters p, int number, int format, png_alloc_size_t value),
1815 PNG_EMPTY);
1816 /* Use png_alloc_size_t because it is an unsigned type as big as any we
1817 * need to output. Use the following for a signed value.
1818 */
1819 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed,
1820 (png_warning_parameters p, int number, int format, png_int_32 value),
1821 PNG_EMPTY);
1822
1823 PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr,
1824 png_warning_parameters p, png_const_charp message),PNG_EMPTY);
1825 /* 'message' follows the X/Open approach of using @1, @2 to insert
1826 * parameters previously supplied using the above functions. Errors in
1827 * specifying the parameters will simply result in garbage substitutions.
1828 */
1829 #endif
1830
1831 #ifdef PNG_BENIGN_ERRORS_SUPPORTED
1832 /* Application errors (new in 1.6); use these functions (declared below) for
1833 * errors in the parameters or order of API function calls on read. The
1834 * 'warning' should be used for an error that can be handled completely; the
1835 * 'error' for one which can be handled safely but which may lose application
1836 * information or settings.
1837 *
1838 * By default these both result in a png_error call prior to release, while in a
1839 * released version the 'warning' is just a warning. However if the application
1840 * explicitly disables benign errors (explicitly permitting the code to lose
1841 * information) they both turn into warnings.
1842 *
1843 * If benign errors aren't supported they end up as the corresponding base call
1844 * (png_warning or png_error.)
1845 */
1846 PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr,
1847 png_const_charp message),PNG_EMPTY);
1848 /* The application provided invalid parameters to an API function or called
1849 * an API function at the wrong time, libpng can completely recover.
1850 */
1851
1852 PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr,
1853 png_const_charp message),PNG_EMPTY);
1854 /* As above but libpng will ignore the call, or attempt some other partial
1855 * recovery from the error.
1856 */
1857 #else
1858 # define png_app_warning(pp,s) png_warning(pp,s)
1859 # define png_app_error(pp,s) png_error(pp,s)
1860 #endif
1861
1862 PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr,
1863 png_const_charp message, int error),PNG_EMPTY);
1864 /* Report a recoverable issue in chunk data. On read this is used to report
1865 * a problem found while reading a particular chunk and the
1866 * png_chunk_benign_error or png_chunk_warning function is used as
1867 * appropriate. On write this is used to report an error that comes from
1868 * data set via an application call to a png_set_ API and png_app_error or
1869 * png_app_warning is used as appropriate.
1870 *
1871 * The 'error' parameter must have one of the following values:
1872 */
1873 #define PNG_CHUNK_WARNING 0 /* never an error */
1874 #define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */
1875 #define PNG_CHUNK_ERROR 2 /* always an error */
1876
1877 /* ASCII to FP interfaces, currently only implemented if sCAL
1878 * support is required.
1879 */
1880 #if defined(PNG_sCAL_SUPPORTED)
1881 /* MAX_DIGITS is actually the maximum number of characters in an sCAL
1882 * width or height, derived from the precision (number of significant
1883 * digits - a build time settable option) and assumptions about the
1884 * maximum ridiculous exponent.
1885 */
1886 #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/)
1887
1888 #ifdef PNG_FLOATING_POINT_SUPPORTED
1889 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr,
1890 png_charp ascii, size_t size, double fp, unsigned int precision),
1891 PNG_EMPTY);
1892 #endif /* FLOATING_POINT */
1893
1894 #ifdef PNG_FIXED_POINT_SUPPORTED
1895 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr,
1896 png_charp ascii, size_t size, png_fixed_point fp),PNG_EMPTY);
1897 #endif /* FIXED_POINT */
1898 #endif /* sCAL */
1899
1900 #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED)
1901 /* An internal API to validate the format of a floating point number.
1902 * The result is the index of the next character. If the number is
1903 * not valid it will be the index of a character in the supposed number.
1904 *
1905 * The format of a number is defined in the PNG extensions specification
1906 * and this API is strictly conformant to that spec, not anyone elses!
1907 *
1908 * The format as a regular expression is:
1909 *
1910 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)?
1911 *
1912 * or:
1913 *
1914 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)?
1915 *
1916 * The complexity is that either integer or fraction must be present and the
1917 * fraction is permitted to have no digits only if the integer is present.
1918 *
1919 * NOTE: The dangling E problem.
1920 * There is a PNG valid floating point number in the following:
1921 *
1922 * PNG floating point numbers are not greedy.
1923 *
1924 * Working this out requires *TWO* character lookahead (because of the
1925 * sign), the parser does not do this - it will fail at the 'r' - this
1926 * doesn't matter for PNG sCAL chunk values, but it requires more care
1927 * if the value were ever to be embedded in something more complex. Use
1928 * ANSI-C strtod if you need the lookahead.
1929 */
1930 /* State table for the parser. */
1931 #define PNG_FP_INTEGER 0 /* before or in integer */
1932 #define PNG_FP_FRACTION 1 /* before or in fraction */
1933 #define PNG_FP_EXPONENT 2 /* before or in exponent */
1934 #define PNG_FP_STATE 3 /* mask for the above */
1935 #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */
1936 #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */
1937 #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */
1938 #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */
1939 #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */
1940
1941 /* These three values don't affect the parser. They are set but not used.
1942 */
1943 #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */
1944 #define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */
1945 #define PNG_FP_NONZERO 256 /* A non-zero value */
1946 #define PNG_FP_STICKY 448 /* The above three flags */
1947
1948 /* This is available for the caller to store in 'state' if required. Do not
1949 * call the parser after setting it (the parser sometimes clears it.)
1950 */
1951 #define PNG_FP_INVALID 512 /* Available for callers as a distinct value */
1952
1953 /* Result codes for the parser (boolean - true meants ok, false means
1954 * not ok yet.)
1955 */
1956 #define PNG_FP_MAYBE 0 /* The number may be valid in the future */
1957 #define PNG_FP_OK 1 /* The number is valid */
1958
1959 /* Tests on the sticky non-zero and negative flags. To pass these checks
1960 * the state must also indicate that the whole number is valid - this is
1961 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this
1962 * is equivalent to PNG_FP_OK above.)
1963 */
1964 #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO)
1965 /* NZ_MASK: the string is valid and a non-zero negative value */
1966 #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO)
1967 /* Z MASK: the string is valid and a non-zero value. */
1968 /* PNG_FP_SAW_DIGIT: the string is valid. */
1969 #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT)
1970 #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK)
1971 #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK)
1972
1973 /* The actual parser. This can be called repeatedly. It updates
1974 * the index into the string and the state variable (which must
1975 * be initialized to 0). It returns a result code, as above. There
1976 * is no point calling the parser any more if it fails to advance to
1977 * the end of the string - it is stuck on an invalid character (or
1978 * terminated by '\0').
1979 *
1980 * Note that the pointer will consume an E or even an E+ and then leave
1981 * a 'maybe' state even though a preceding integer.fraction is valid.
1982 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was
1983 * a valid number. It's possible to recover from this by calling
1984 * the parser again (from the start, with state 0) but with a string
1985 * that omits the last character (i.e. set the size to the index of
1986 * the problem character.) This has not been tested within libpng.
1987 */
1988 PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string,
1989 size_t size, int *statep, png_size_tp whereami),PNG_EMPTY);
1990
1991 /* This is the same but it checks a complete string and returns true
1992 * only if it just contains a floating point number. As of 1.5.4 this
1993 * function also returns the state at the end of parsing the number if
1994 * it was valid (otherwise it returns 0.) This can be used for testing
1995 * for negative or zero values using the sticky flag.
1996 */
1997 PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string,
1998 size_t size),PNG_EMPTY);
1999 #endif /* pCAL || sCAL */
2000
2001 #if defined(PNG_GAMMA_SUPPORTED) ||\
2002 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED)
2003 /* Added at libpng version 1.5.0 */
2004 /* This is a utility to provide a*times/div (rounded) and indicate
2005 * if there is an overflow. The result is a boolean - false (0)
2006 * for overflow, true (1) if no overflow, in which case *res
2007 * holds the result.
2008 */
2009 PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a,
2010 png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY);
2011 #endif
2012
2013 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED)
2014 /* Same deal, but issue a warning on overflow and return 0. */
2015 PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn,
2016 (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by,
2017 png_int_32 divided_by),PNG_EMPTY);
2018 #endif
2019
2020 #ifdef PNG_GAMMA_SUPPORTED
2021 /* Calculate a reciprocal - used for gamma values. This returns
2022 * 0 if the argument is 0 in order to maintain an undefined value;
2023 * there are no warnings.
2024 */
2025 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a),
2026 PNG_EMPTY);
2027
2028 #ifdef PNG_READ_GAMMA_SUPPORTED
2029 /* The same but gives a reciprocal of the product of two fixed point
2030 * values. Accuracy is suitable for gamma calculations but this is
2031 * not exact - use png_muldiv for that. Only required at present on read.
2032 */
2033 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a,
2034 png_fixed_point b),PNG_EMPTY);
2035 #endif
2036
2037 /* Return true if the gamma value is significantly different from 1.0 */
2038 PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value),
2039 PNG_EMPTY);
2040 #endif
2041
2042 #ifdef PNG_READ_GAMMA_SUPPORTED
2043 /* Internal fixed point gamma correction. These APIs are called as
2044 * required to convert single values - they don't need to be fast,
2045 * they are not used when processing image pixel values.
2046 *
2047 * While the input is an 'unsigned' value it must actually be the
2048 * correct bit value - 0..255 or 0..65535 as required.
2049 */
2050 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr,
2051 unsigned int value, png_fixed_point gamma_value),PNG_EMPTY);
2052 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value,
2053 png_fixed_point gamma_value),PNG_EMPTY);
2054 PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value,
2055 png_fixed_point gamma_value),PNG_EMPTY);
2056 PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr),
2057 PNG_EMPTY);
2058 PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr,
2059 int bit_depth),PNG_EMPTY);
2060 #endif
2061
2062 /* SIMPLIFIED READ/WRITE SUPPORT */
2063 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
2064 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
2065 /* The internal structure that png_image::opaque points to. */
2066 typedef struct png_control
2067 {
2068 png_structp png_ptr;
2069 png_infop info_ptr;
2070 png_voidp error_buf; /* Always a jmp_buf at present. */
2071
2072 png_const_bytep memory; /* Memory buffer. */
2073 size_t size; /* Size of the memory buffer. */
2074
2075 unsigned int for_write :1; /* Otherwise it is a read structure */
2076 unsigned int owned_file :1; /* We own the file in io_ptr */
2077 } png_control;
2078
2079 /* Return the pointer to the jmp_buf from a png_control: necessary because C
2080 * does not reveal the type of the elements of jmp_buf.
2081 */
2082 #ifdef __cplusplus
2083 # define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0])
2084 #else
2085 # define png_control_jmp_buf(pc) ((pc)->error_buf)
2086 #endif
2087
2088 /* Utility to safely execute a piece of libpng code catching and logging any
2089 * errors that might occur. Returns true on success, false on failure (either
2090 * of the function or as a result of a png_error.)
2091 */
2092 PNG_INTERNAL_CALLBACK(void,png_safe_error,(png_structp png_ptr,
2093 png_const_charp error_message),PNG_NORETURN);
2094
2095 #ifdef PNG_WARNINGS_SUPPORTED
2096 PNG_INTERNAL_CALLBACK(void,png_safe_warning,(png_structp png_ptr,
2097 png_const_charp warning_message),PNG_EMPTY);
2098 #else
2099 # define png_safe_warning 0/*dummy argument*/
2100 #endif
2101
2102 PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image,
2103 int (*function)(png_voidp), png_voidp arg),PNG_EMPTY);
2104
2105 /* Utility to log an error; this also cleans up the png_image; the function
2106 * always returns 0 (false).
2107 */
2108 PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image,
2109 png_const_charp error_message),PNG_EMPTY);
2110
2111 #ifndef PNG_SIMPLIFIED_READ_SUPPORTED
2112 /* png_image_free is used by the write code but not exported */
2113 PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY);
2114 #endif /* !SIMPLIFIED_READ */
2115
2116 #endif /* SIMPLIFIED READ/WRITE */
2117
2118 /* These are initialization functions for hardware specific PNG filter
2119 * optimizations; list these here then select the appropriate one at compile
2120 * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined
2121 * the generic code is used.
2122 */
2123 #ifdef PNG_FILTER_OPTIMIZATIONS
2124 PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr,
2125 unsigned int bpp), PNG_EMPTY);
2126 /* Just declare the optimization that will be used */
2127 #else
2128 /* List *all* the possible optimizations here - this branch is required if
2129 * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in
2130 * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing.
2131 */
2132 # if PNG_ARM_NEON_OPT > 0
2133 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon,
2134 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
2135 #endif
2136
2137 #if PNG_MIPS_MSA_OPT > 0
2138 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_msa,
2139 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
2140 #endif
2141
2142 # if PNG_INTEL_SSE_IMPLEMENTATION > 0
2143 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_sse2,
2144 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
2145 # endif
2146 #endif
2147
2148 PNG_INTERNAL_FUNCTION(png_uint_32, png_check_keyword, (png_structrp png_ptr,
2149 png_const_charp key, png_bytep new_key), PNG_EMPTY);
2150
2151 #if PNG_ARM_NEON_IMPLEMENTATION == 1
2152 PNG_INTERNAL_FUNCTION(void,
2153 png_riffle_palette_neon,
2154 (png_structrp),
2155 PNG_EMPTY);
2156 PNG_INTERNAL_FUNCTION(int,
2157 png_do_expand_palette_rgba8_neon,
2158 (png_structrp,
2159 png_row_infop,
2160 png_const_bytep,
2161 const png_bytepp,
2162 const png_bytepp),
2163 PNG_EMPTY);
2164 PNG_INTERNAL_FUNCTION(int,
2165 png_do_expand_palette_rgb8_neon,
2166 (png_structrp,
2167 png_row_infop,
2168 png_const_bytep,
2169 const png_bytepp,
2170 const png_bytepp),
2171 PNG_EMPTY);
2172 #endif
2173
2174 /* Maintainer: Put new private prototypes here ^ */
2175
2176 #include "pngdebug.h"
2177
2178 #ifdef __cplusplus
2179 }
2180 #endif
2181
2182 #endif /* PNG_VERSION_INFO_ONLY */
2183 #endif /* PNGPRIV_H */