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 * Last changed in libpng 1.6.35 [July 15, 2018]
33 * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
34 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
35 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
36 *
37 * 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 # define PNG_ARM_NEON_IMPLEMENTATION 2
206 # endif /* __ARM_NEON__ */
207 # endif /* !PNG_ARM_NEON_IMPLEMENTATION */
208
209 # ifndef PNG_ARM_NEON_IMPLEMENTATION
210 /* Use the intrinsics code by default. */
211 # define PNG_ARM_NEON_IMPLEMENTATION 1
212 # endif
213 #endif /* PNG_ARM_NEON_OPT > 0 */
214
215 #ifndef PNG_MIPS_MSA_OPT
216 # if defined(__mips_msa) && (__mips_isa_rev >= 5) && defined(PNG_ALIGNED_MEMORY_SUPPORTED)
217 # define PNG_MIPS_MSA_OPT 2
218 # else
219 # define PNG_MIPS_MSA_OPT 0
220 # endif
221 #endif
222
223 #ifndef PNG_POWERPC_VSX_OPT
224 # if defined(__PPC64__) && defined(__ALTIVEC__) && defined(__VSX__)
225 # define PNG_POWERPC_VSX_OPT 2
226 # else
227 # define PNG_POWERPC_VSX_OPT 0
228 # endif
229 #endif
230
231 #ifndef PNG_INTEL_SSE_OPT
232 # ifdef PNG_INTEL_SSE
233 /* Only check for SSE if the build configuration has been modified to
234 * enable SSE optimizations. This means that these optimizations will
235 * be off by default. See contrib/intel for more details.
236 */
237 # if defined(__SSE4_1__) || defined(__AVX__) || defined(__SSSE3__) || \
238 defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \
239 (defined(_M_IX86_FP) && _M_IX86_FP >= 2)
240 # define PNG_INTEL_SSE_OPT 1
241 # else
242 # define PNG_INTEL_SSE_OPT 0
243 # endif
244 # else
245 # define PNG_INTEL_SSE_OPT 0
246 # endif
247 #endif
248
249 #if PNG_INTEL_SSE_OPT > 0
250 # ifndef PNG_INTEL_SSE_IMPLEMENTATION
251 # if defined(__SSE4_1__) || defined(__AVX__)
252 /* We are not actually using AVX, but checking for AVX is the best
253 way we can detect SSE4.1 and SSSE3 on MSVC.
254 */
255 # define PNG_INTEL_SSE_IMPLEMENTATION 3
256 # elif defined(__SSSE3__)
257 # define PNG_INTEL_SSE_IMPLEMENTATION 2
258 # elif defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \
259 (defined(_M_IX86_FP) && _M_IX86_FP >= 2)
260 # define PNG_INTEL_SSE_IMPLEMENTATION 1
261 # else
262 # define PNG_INTEL_SSE_IMPLEMENTATION 0
263 # endif
264 # endif
265
266 # if PNG_INTEL_SSE_IMPLEMENTATION > 0
267 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_sse2
268 # endif
269 #else
270 # define PNG_INTEL_SSE_IMPLEMENTATION 0
271 #endif
272
273 #if PNG_MIPS_MSA_OPT > 0
274 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_msa
275 # ifndef PNG_MIPS_MSA_IMPLEMENTATION
276 # if defined(__mips_msa)
277 # if defined(__clang__)
278 # elif defined(__GNUC__)
279 # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7)
280 # define PNG_MIPS_MSA_IMPLEMENTATION 2
281 # endif /* no GNUC support */
282 # endif /* __GNUC__ */
283 # else /* !defined __mips_msa */
284 # define PNG_MIPS_MSA_IMPLEMENTATION 2
285 # endif /* __mips_msa */
286 # endif /* !PNG_MIPS_MSA_IMPLEMENTATION */
287
288 # ifndef PNG_MIPS_MSA_IMPLEMENTATION
289 # define PNG_MIPS_MSA_IMPLEMENTATION 1
290 # endif
291 #endif /* PNG_MIPS_MSA_OPT > 0 */
292
293 #ifdef PNG_POWERPC_VSX_API_SUPPORTED
294 #if PNG_POWERPC_VSX_OPT > 0
295 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_vsx
296 # define PNG_POWERPC_VSX_IMPLEMENTATION 1
297 #endif
298 #endif
299
300
301 /* Is this a build of a DLL where compilation of the object modules requires
302 * different preprocessor settings to those required for a simple library? If
303 * so PNG_BUILD_DLL must be set.
304 *
305 * If libpng is used inside a DLL but that DLL does not export the libpng APIs
306 * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a
307 * static library of libpng then link the DLL against that.
308 */
309 #ifndef PNG_BUILD_DLL
310 # ifdef DLL_EXPORT
311 /* This is set by libtool when files are compiled for a DLL; libtool
312 * always compiles twice, even on systems where it isn't necessary. Set
313 * PNG_BUILD_DLL in case it is necessary:
314 */
315 # define PNG_BUILD_DLL
316 # else
317 # ifdef _WINDLL
318 /* This is set by the Microsoft Visual Studio IDE in projects that
319 * build a DLL. It can't easily be removed from those projects (it
320 * isn't visible in the Visual Studio UI) so it is a fairly reliable
321 * indication that PNG_IMPEXP needs to be set to the DLL export
322 * attributes.
323 */
324 # define PNG_BUILD_DLL
325 # else
326 # ifdef __DLL__
327 /* This is set by the Borland C system when compiling for a DLL
328 * (as above.)
329 */
330 # define PNG_BUILD_DLL
331 # else
332 /* Add additional compiler cases here. */
333 # endif
334 # endif
335 # endif
336 #endif /* Setting PNG_BUILD_DLL if required */
337
338 /* See pngconf.h for more details: the builder of the library may set this on
339 * the command line to the right thing for the specific compilation system or it
340 * may be automagically set above (at present we know of no system where it does
341 * need to be set on the command line.)
342 *
343 * PNG_IMPEXP must be set here when building the library to prevent pngconf.h
344 * setting it to the "import" setting for a DLL build.
345 */
346 #ifndef PNG_IMPEXP
347 # ifdef PNG_BUILD_DLL
348 # define PNG_IMPEXP PNG_DLL_EXPORT
349 # else
350 /* Not building a DLL, or the DLL doesn't require specific export
351 * definitions.
352 */
353 # define PNG_IMPEXP
354 # endif
355 #endif
356
357 /* No warnings for private or deprecated functions in the build: */
358 #ifndef PNG_DEPRECATED
359 # define PNG_DEPRECATED
360 #endif
361 #ifndef PNG_PRIVATE
362 # define PNG_PRIVATE
363 #endif
364
365 /* Symbol preprocessing support.
366 *
367 * To enable listing global, but internal, symbols the following macros should
368 * always be used to declare an extern data or function object in this file.
369 */
370 #ifndef PNG_INTERNAL_DATA
371 # define PNG_INTERNAL_DATA(type, name, array) PNG_LINKAGE_DATA type name array
372 #endif
373
374 #ifndef PNG_INTERNAL_FUNCTION
375 # define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\
376 PNG_LINKAGE_FUNCTION PNG_FUNCTION(type, name, args, PNG_EMPTY attributes)
377 #endif
378
379 #ifndef PNG_INTERNAL_CALLBACK
380 # define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\
381 PNG_LINKAGE_CALLBACK PNG_FUNCTION(type, (PNGCBAPI name), args,\
382 PNG_EMPTY attributes)
383 #endif
384
385 /* If floating or fixed point APIs are disabled they may still be compiled
386 * internally. To handle this make sure they are declared as the appropriate
387 * internal extern function (otherwise the symbol prefixing stuff won't work and
388 * the functions will be used without definitions.)
389 *
390 * NOTE: although all the API functions are declared here they are not all
391 * actually built! Because the declarations are still made it is necessary to
392 * fake out types that they depend on.
393 */
394 #ifndef PNG_FP_EXPORT
395 # ifndef PNG_FLOATING_POINT_SUPPORTED
396 # define PNG_FP_EXPORT(ordinal, type, name, args)\
397 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
398 # ifndef PNG_VERSION_INFO_ONLY
399 typedef struct png_incomplete png_double;
400 typedef png_double* png_doublep;
401 typedef const png_double* png_const_doublep;
402 typedef png_double** png_doublepp;
403 # endif
404 # endif
405 #endif
406 #ifndef PNG_FIXED_EXPORT
407 # ifndef PNG_FIXED_POINT_SUPPORTED
408 # define PNG_FIXED_EXPORT(ordinal, type, name, args)\
409 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
410 # endif
411 #endif
412
413 #include "png.h"
414
415 /* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */
416 #ifndef PNG_DLL_EXPORT
417 # define PNG_DLL_EXPORT
418 #endif
419
420 /* This is a global switch to set the compilation for an installed system
421 * (a release build). It can be set for testing debug builds to ensure that
422 * they will compile when the build type is switched to RC or STABLE, the
423 * default is just to use PNG_LIBPNG_BUILD_BASE_TYPE. Set this in CPPFLAGS
424 * with either:
425 *
426 * -DPNG_RELEASE_BUILD Turns on the release compile path
427 * -DPNG_RELEASE_BUILD=0 Turns it off
428 * or in your pngusr.h with
429 * #define PNG_RELEASE_BUILD=1 Turns on the release compile path
430 * #define PNG_RELEASE_BUILD=0 Turns it off
431 */
432 #ifndef PNG_RELEASE_BUILD
433 # define PNG_RELEASE_BUILD (PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC)
434 #endif
435
436 /* SECURITY and SAFETY:
437 *
438 * libpng is built with support for internal limits on image dimensions and
439 * memory usage. These are documented in scripts/pnglibconf.dfa of the
440 * source and recorded in the machine generated header file pnglibconf.h.
441 */
442
443 /* If you are running on a machine where you cannot allocate more
444 * than 64K of memory at once, uncomment this. While libpng will not
445 * normally need that much memory in a chunk (unless you load up a very
446 * large file), zlib needs to know how big of a chunk it can use, and
447 * libpng thus makes sure to check any memory allocation to verify it
448 * will fit into memory.
449 *
450 * zlib provides 'MAXSEG_64K' which, if defined, indicates the
451 * same limit and pngconf.h (already included) sets the limit
452 * if certain operating systems are detected.
453 */
454 #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
455 # define PNG_MAX_MALLOC_64K
456 #endif
457
458 #ifndef PNG_UNUSED
459 /* Unused formal parameter warnings are silenced using the following macro
460 * which is expected to have no bad effects on performance (optimizing
461 * compilers will probably remove it entirely). Note that if you replace
462 * it with something other than whitespace, you must include the terminating
463 * semicolon.
464 */
465 # define PNG_UNUSED(param) (void)param;
466 #endif
467
468 /* Just a little check that someone hasn't tried to define something
469 * contradictory.
470 */
471 #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K)
472 # undef PNG_ZBUF_SIZE
473 # define PNG_ZBUF_SIZE 65536L
474 #endif
475
476 /* If warnings or errors are turned off the code is disabled or redirected here.
477 * From 1.5.4 functions have been added to allow very limited formatting of
478 * error and warning messages - this code will also be disabled here.
479 */
480 #ifdef PNG_WARNINGS_SUPPORTED
481 # define PNG_WARNING_PARAMETERS(p) png_warning_parameters p;
482 #else
483 # define png_warning_parameter(p,number,string) ((void)0)
484 # define png_warning_parameter_unsigned(p,number,format,value) ((void)0)
485 # define png_warning_parameter_signed(p,number,format,value) ((void)0)
486 # define png_formatted_warning(pp,p,message) ((void)(pp))
487 # define PNG_WARNING_PARAMETERS(p)
488 #endif
489 #ifndef PNG_ERROR_TEXT_SUPPORTED
490 # define png_fixed_error(s1,s2) png_err(s1)
491 #endif
492
493 /* Some fixed point APIs are still required even if not exported because
494 * they get used by the corresponding floating point APIs. This magic
495 * deals with this:
496 */
497 #ifdef PNG_FIXED_POINT_SUPPORTED
498 # define PNGFAPI PNGAPI
499 #else
500 # define PNGFAPI /* PRIVATE */
501 #endif
502
503 #ifndef PNG_VERSION_INFO_ONLY
504 /* Other defines specific to compilers can go here. Try to keep
505 * them inside an appropriate ifdef/endif pair for portability.
506 */
507
508 /* C allows up-casts from (void*) to any pointer and (const void*) to any
509 * pointer to a const object. C++ regards this as a type error and requires an
510 * explicit, static, cast and provides the static_cast<> rune to ensure that
511 * const is not cast away.
512 */
513 #ifdef __cplusplus
514 # define png_voidcast(type, value) static_cast<type>(value)
515 # define png_constcast(type, value) const_cast<type>(value)
516 # define png_aligncast(type, value) \
517 static_cast<type>(static_cast<void*>(value))
518 # define png_aligncastconst(type, value) \
519 static_cast<type>(static_cast<const void*>(value))
520 #else
521 # define png_voidcast(type, value) (value)
522 # ifdef _WIN64
523 # ifdef __GNUC__
524 typedef unsigned long long png_ptruint;
525 # else
526 typedef unsigned __int64 png_ptruint;
527 # endif
528 # else
529 typedef unsigned long png_ptruint;
530 # endif
531 # define png_constcast(type, value) ((type)(png_ptruint)(const void*)(value))
532 # define png_aligncast(type, value) ((void*)(value))
533 # define png_aligncastconst(type, value) ((const void*)(value))
534 #endif /* __cplusplus */
535
536 #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\
537 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
538 /* png.c requires the following ANSI-C constants if the conversion of
539 * floating point to ASCII is implemented therein:
540 *
541 * DBL_DIG Maximum number of decimal digits (can be set to any constant)
542 * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value)
543 * DBL_MAX Maximum floating point number (can be set to an arbitrary value)
544 */
545 # include <float.h>
546
547 # if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
548 defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
549 /* We need to check that <math.h> hasn't already been included earlier
550 * as it seems it doesn't agree with <fp.h>, yet we should really use
551 * <fp.h> if possible.
552 */
553 # if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
554 # include <fp.h>
555 # endif
556 # else
557 # include <math.h>
558 # endif
559 # if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
560 /* Amiga SAS/C: We must include builtin FPU functions when compiling using
561 * MATH=68881
562 */
563 # include <m68881.h>
564 # endif
565 #endif
566
567 /* This provides the non-ANSI (far) memory allocation routines. */
568 #if defined(__TURBOC__) && defined(__MSDOS__)
569 # include <mem.h>
570 # include <alloc.h>
571 #endif
572
573 #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \
574 defined(_WIN32) || defined(__WIN32__)
575 # include <windows.h> /* defines _WINDOWS_ macro */
576 #endif
577 #endif /* PNG_VERSION_INFO_ONLY */
578
579 /* Moved here around 1.5.0beta36 from pngconf.h */
580 /* Users may want to use these so they are not private. Any library
581 * functions that are passed far data must be model-independent.
582 */
583
584 /* Memory model/platform independent fns */
585 #ifndef PNG_ABORT
586 # ifdef _WINDOWS_
587 # define PNG_ABORT() ExitProcess(0)
588 # else
589 # define PNG_ABORT() abort()
590 # endif
591 #endif
592
593 /* These macros may need to be architecture dependent. */
594 #define PNG_ALIGN_NONE 0 /* do not use data alignment */
595 #define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */
596 #ifdef offsetof
597 # define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */
598 #else
599 # define PNG_ALIGN_OFFSET -1 /* prevent the use of this */
600 #endif
601 #define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */
602
603 #ifndef PNG_ALIGN_TYPE
604 /* Default to using aligned access optimizations and requiring alignment to a
605 * multiple of the data type size. Override in a compiler specific fashion
606 * if necessary by inserting tests here:
607 */
608 # define PNG_ALIGN_TYPE PNG_ALIGN_SIZE
609 #endif
610
611 #if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE
612 /* This is used because in some compiler implementations non-aligned
613 * structure members are supported, so the offsetof approach below fails.
614 * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access
615 * is good for performance. Do not do this unless you have tested the result
616 * and understand it.
617 */
618 # define png_alignof(type) (sizeof (type))
619 #else
620 # if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET
621 # define png_alignof(type) offsetof(struct{char c; type t;}, t)
622 # else
623 # if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS
624 # define png_alignof(type) (1)
625 # endif
626 /* Else leave png_alignof undefined to prevent use thereof */
627 # endif
628 #endif
629
630 /* This implicitly assumes alignment is always to a power of 2. */
631 #ifdef png_alignof
632 # define png_isaligned(ptr, type)\
633 (((type)((const char*)ptr-(const char*)0) & \
634 (type)(png_alignof(type)-1)) == 0)
635 #else
636 # define png_isaligned(ptr, type) 0
637 #endif
638
639 /* End of memory model/platform independent support */
640 /* End of 1.5.0beta36 move from pngconf.h */
641
642 /* CONSTANTS and UTILITY MACROS
643 * These are used internally by libpng and not exposed in the API
644 */
645
646 /* Various modes of operation. Note that after an init, mode is set to
647 * zero automatically when the structure is created. Three of these
648 * are defined in png.h because they need to be visible to applications
649 * that call png_set_unknown_chunk().
650 */
651 /* #define PNG_HAVE_IHDR 0x01U (defined in png.h) */
652 /* #define PNG_HAVE_PLTE 0x02U (defined in png.h) */
653 #define PNG_HAVE_IDAT 0x04U
654 /* #define PNG_AFTER_IDAT 0x08U (defined in png.h) */
655 #define PNG_HAVE_IEND 0x10U
656 /* 0x20U (unused) */
657 /* 0x40U (unused) */
658 /* 0x80U (unused) */
659 #define PNG_HAVE_CHUNK_HEADER 0x100U
660 #define PNG_WROTE_tIME 0x200U
661 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400U
662 #define PNG_BACKGROUND_IS_GRAY 0x800U
663 #define PNG_HAVE_PNG_SIGNATURE 0x1000U
664 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000U /* Have another chunk after IDAT */
665 /* 0x4000U (unused) */
666 #define PNG_IS_READ_STRUCT 0x8000U /* Else is a write struct */
667
668 /* Flags for the transformations the PNG library does on the image data */
669 #define PNG_BGR 0x0001U
670 #define PNG_INTERLACE 0x0002U
671 #define PNG_PACK 0x0004U
672 #define PNG_SHIFT 0x0008U
673 #define PNG_SWAP_BYTES 0x0010U
674 #define PNG_INVERT_MONO 0x0020U
675 #define PNG_QUANTIZE 0x0040U
676 #define PNG_COMPOSE 0x0080U /* Was PNG_BACKGROUND */
677 #define PNG_BACKGROUND_EXPAND 0x0100U
678 #define PNG_EXPAND_16 0x0200U /* Added to libpng 1.5.2 */
679 #define PNG_16_TO_8 0x0400U /* Becomes 'chop' in 1.5.4 */
680 #define PNG_RGBA 0x0800U
681 #define PNG_EXPAND 0x1000U
682 #define PNG_GAMMA 0x2000U
683 #define PNG_GRAY_TO_RGB 0x4000U
684 #define PNG_FILLER 0x8000U
685 #define PNG_PACKSWAP 0x10000U
686 #define PNG_SWAP_ALPHA 0x20000U
687 #define PNG_STRIP_ALPHA 0x40000U
688 #define PNG_INVERT_ALPHA 0x80000U
689 #define PNG_USER_TRANSFORM 0x100000U
690 #define PNG_RGB_TO_GRAY_ERR 0x200000U
691 #define PNG_RGB_TO_GRAY_WARN 0x400000U
692 #define PNG_RGB_TO_GRAY 0x600000U /* two bits, RGB_TO_GRAY_ERR|WARN */
693 #define PNG_ENCODE_ALPHA 0x800000U /* Added to libpng-1.5.4 */
694 #define PNG_ADD_ALPHA 0x1000000U /* Added to libpng-1.2.7 */
695 #define PNG_EXPAND_tRNS 0x2000000U /* Added to libpng-1.2.9 */
696 #define PNG_SCALE_16_TO_8 0x4000000U /* Added to libpng-1.5.4 */
697 /* 0x8000000U unused */
698 /* 0x10000000U unused */
699 /* 0x20000000U unused */
700 /* 0x40000000U unused */
701 /* Flags for png_create_struct */
702 #define PNG_STRUCT_PNG 0x0001U
703 #define PNG_STRUCT_INFO 0x0002U
704
705 /* Flags for the png_ptr->flags rather than declaring a byte for each one */
706 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001U
707 #define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002U /* Added to libpng-1.6.0 */
708 /* 0x0004U unused */
709 #define PNG_FLAG_ZSTREAM_ENDED 0x0008U /* Added to libpng-1.6.0 */
710 /* 0x0010U unused */
711 /* 0x0020U unused */
712 #define PNG_FLAG_ROW_INIT 0x0040U
713 #define PNG_FLAG_FILLER_AFTER 0x0080U
714 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100U
715 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200U
716 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400U
717 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800U
718 #define PNG_FLAG_ASSUME_sRGB 0x1000U /* Added to libpng-1.5.4 */
719 #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000U /* Added to libpng-1.5.4 */
720 #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000U /* Added to libpng-1.5.4 */
721 /* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000U */
722 /* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000U */
723 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000U
724 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000U
725 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000U
726 #define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000U /* Added to libpng-1.4.0 */
727 #define PNG_FLAG_APP_WARNINGS_WARN 0x200000U /* Added to libpng-1.6.0 */
728 #define PNG_FLAG_APP_ERRORS_WARN 0x400000U /* Added to libpng-1.6.0 */
729 /* 0x800000U unused */
730 /* 0x1000000U unused */
731 /* 0x2000000U unused */
732 /* 0x4000000U unused */
733 /* 0x8000000U unused */
734 /* 0x10000000U unused */
735 /* 0x20000000U unused */
736 /* 0x40000000U unused */
737
738 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
739 PNG_FLAG_CRC_ANCILLARY_NOWARN)
740
741 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
742 PNG_FLAG_CRC_CRITICAL_IGNORE)
743
744 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
745 PNG_FLAG_CRC_CRITICAL_MASK)
746
747 /* Save typing and make code easier to understand */
748
749 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
750 abs((int)((c1).green) - (int)((c2).green)) + \
751 abs((int)((c1).blue) - (int)((c2).blue)))
752
753 /* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255
754 * by dividing by 257 *with rounding*. This macro is exact for the given range.
755 * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the
756 * macro were established by experiment (modifying the added value). The macro
757 * has a second variant that takes a value already scaled by 255 and divides by
758 * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it
759 * only gives off-by-one errors and only for 0.5% (1 in 200) of the values.
760 */
761 #define PNG_DIV65535(v24) (((v24) + 32895) >> 16)
762 #define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255)
763
764 /* Added to libpng-1.2.6 JB */
765 #define PNG_ROWBYTES(pixel_bits, width) \
766 ((pixel_bits) >= 8 ? \
767 ((size_t)(width) * (((size_t)(pixel_bits)) >> 3)) : \
768 (( ((size_t)(width) * ((size_t)(pixel_bits))) + 7) >> 3) )
769
770 /* This returns the number of trailing bits in the last byte of a row, 0 if the
771 * last byte is completely full of pixels. It is, in principle, (pixel_bits x
772 * width) % 8, but that would overflow for large 'width'. The second macro is
773 * the same except that it returns the number of unused bits in the last byte;
774 * (8-TRAILBITS), but 0 when TRAILBITS is 0.
775 *
776 * NOTE: these macros are intended to be self-evidently correct and never
777 * overflow on the assumption that pixel_bits is in the range 0..255. The
778 * arguments are evaluated only once and they can be signed (e.g. as a result of
779 * the integral promotions). The result of the expression always has type
780 * (png_uint_32), however the compiler always knows it is in the range 0..7.
781 */
782 #define PNG_TRAILBITS(pixel_bits, width) \
783 (((pixel_bits) * ((width) % (png_uint_32)8)) % 8)
784
785 #define PNG_PADBITS(pixel_bits, width) \
786 ((8 - PNG_TRAILBITS(pixel_bits, width)) % 8)
787
788 /* PNG_OUT_OF_RANGE returns true if value is outside the range
789 * ideal-delta..ideal+delta. Each argument is evaluated twice.
790 * "ideal" and "delta" should be constants, normally simple
791 * integers, "value" a variable. Added to libpng-1.2.6 JB
792 */
793 #define PNG_OUT_OF_RANGE(value, ideal, delta) \
794 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
795
796 /* Conversions between fixed and floating point, only defined if
797 * required (to make sure the code doesn't accidentally use float
798 * when it is supposedly disabled.)
799 */
800 #ifdef PNG_FLOATING_POINT_SUPPORTED
801 /* The floating point conversion can't overflow, though it can and
802 * does lose accuracy relative to the original fixed point value.
803 * In practice this doesn't matter because png_fixed_point only
804 * stores numbers with very low precision. The png_ptr and s
805 * arguments are unused by default but are there in case error
806 * checking becomes a requirement.
807 */
808 #define png_float(png_ptr, fixed, s) (.00001 * (fixed))
809
810 /* The fixed point conversion performs range checking and evaluates
811 * its argument multiple times, so must be used with care. The
812 * range checking uses the PNG specification values for a signed
813 * 32-bit fixed point value except that the values are deliberately
814 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly
815 * (2^31-1) * 100000). 's' is a string that describes the value being
816 * converted.
817 *
818 * NOTE: this macro will raise a png_error if the range check fails,
819 * therefore it is normally only appropriate to use this on values
820 * that come from API calls or other sources where an out of range
821 * error indicates a programming error, not a data error!
822 *
823 * NOTE: by default this is off - the macro is not used - because the
824 * function call saves a lot of code.
825 */
826 #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED
827 #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\
828 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0))
829 #endif
830 /* else the corresponding function is defined below, inside the scope of the
831 * cplusplus test.
832 */
833 #endif
834
835 /* Constants for known chunk types. If you need to add a chunk, define the name
836 * here. For historical reasons these constants have the form png_<name>; i.e.
837 * the prefix is lower case. Please use decimal values as the parameters to
838 * match the ISO PNG specification and to avoid relying on the C locale
839 * interpretation of character values.
840 *
841 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values
842 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string
843 * to be generated if required.
844 *
845 * PNG_32b correctly produces a value shifted by up to 24 bits, even on
846 * architectures where (int) is only 16 bits.
847 */
848 #define PNG_32b(b,s) ((png_uint_32)(b) << (s))
849 #define PNG_U32(b1,b2,b3,b4) \
850 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0))
851
852 /* Constants for known chunk types.
853 *
854 * MAINTAINERS: If you need to add a chunk, define the name here.
855 * For historical reasons these constants have the form png_<name>; i.e.
856 * the prefix is lower case. Please use decimal values as the parameters to
857 * match the ISO PNG specification and to avoid relying on the C locale
858 * interpretation of character values. Please keep the list sorted.
859 *
860 * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk
861 * type. In fact the specification does not express chunk types this way,
862 * however using a 32-bit value means that the chunk type can be read from the
863 * stream using exactly the same code as used for a 32-bit unsigned value and
864 * can be examined far more efficiently (using one arithmetic compare).
865 *
866 * Prior to 1.5.6 the chunk type constants were expressed as C strings. The
867 * libpng API still uses strings for 'unknown' chunks and a macro,
868 * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice
869 * that for portable code numeric values must still be used; the string "IHDR"
870 * is not portable and neither is PNG_U32('I', 'H', 'D', 'R').
871 *
872 * In 1.7.0 the definitions will be made public in png.h to avoid having to
873 * duplicate the same definitions in application code.
874 */
875 #define png_IDAT PNG_U32( 73, 68, 65, 84)
876 #define png_IEND PNG_U32( 73, 69, 78, 68)
877 #define png_IHDR PNG_U32( 73, 72, 68, 82)
878 #define png_PLTE PNG_U32( 80, 76, 84, 69)
879 #define png_bKGD PNG_U32( 98, 75, 71, 68)
880 #define png_cHRM PNG_U32( 99, 72, 82, 77)
881 #define png_eXIf PNG_U32(101, 88, 73, 102) /* registered July 2017 */
882 #define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */
883 #define png_gAMA PNG_U32(103, 65, 77, 65)
884 #define png_gIFg PNG_U32(103, 73, 70, 103)
885 #define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */
886 #define png_gIFx PNG_U32(103, 73, 70, 120)
887 #define png_hIST PNG_U32(104, 73, 83, 84)
888 #define png_iCCP PNG_U32(105, 67, 67, 80)
889 #define png_iTXt PNG_U32(105, 84, 88, 116)
890 #define png_oFFs PNG_U32(111, 70, 70, 115)
891 #define png_pCAL PNG_U32(112, 67, 65, 76)
892 #define png_pHYs PNG_U32(112, 72, 89, 115)
893 #define png_sBIT PNG_U32(115, 66, 73, 84)
894 #define png_sCAL PNG_U32(115, 67, 65, 76)
895 #define png_sPLT PNG_U32(115, 80, 76, 84)
896 #define png_sRGB PNG_U32(115, 82, 71, 66)
897 #define png_sTER PNG_U32(115, 84, 69, 82)
898 #define png_tEXt PNG_U32(116, 69, 88, 116)
899 #define png_tIME PNG_U32(116, 73, 77, 69)
900 #define png_tRNS PNG_U32(116, 82, 78, 83)
901 #define png_zTXt PNG_U32(122, 84, 88, 116)
902
903 /* The following will work on (signed char*) strings, whereas the get_uint_32
904 * macro will fail on top-bit-set values because of the sign extension.
905 */
906 #define PNG_CHUNK_FROM_STRING(s)\
907 PNG_U32(0xff & (s)[0], 0xff & (s)[1], 0xff & (s)[2], 0xff & (s)[3])
908
909 /* This uses (char), not (png_byte) to avoid warnings on systems where (char) is
910 * signed and the argument is a (char[]) This macro will fail miserably on
911 * systems where (char) is more than 8 bits.
912 */
913 #define PNG_STRING_FROM_CHUNK(s,c)\
914 (void)(((char*)(s))[0]=(char)(((c)>>24) & 0xff), \
915 ((char*)(s))[1]=(char)(((c)>>16) & 0xff),\
916 ((char*)(s))[2]=(char)(((c)>>8) & 0xff), \
917 ((char*)(s))[3]=(char)((c & 0xff)))
918
919 /* Do the same but terminate with a null character. */
920 #define PNG_CSTRING_FROM_CHUNK(s,c)\
921 (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0)
922
923 /* Test on flag values as defined in the spec (section 5.4): */
924 #define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29))
925 #define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c))
926 #define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21))
927 #define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13))
928 #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5))
929
930 /* Gamma values (new at libpng-1.5.4): */
931 #define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */
932 #define PNG_GAMMA_MAC_INVERSE 65909
933 #define PNG_GAMMA_sRGB_INVERSE 45455
934
935 /* Almost everything below is C specific; the #defines above can be used in
936 * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot.
937 */
938 #ifndef PNG_VERSION_INFO_ONLY
939
940 #include "pngstruct.h"
941 #include "pnginfo.h"
942
943 /* Validate the include paths - the include path used to generate pnglibconf.h
944 * must match that used in the build, or we must be using pnglibconf.h.prebuilt:
945 */
946 #if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM
947 # error ZLIB_VERNUM != PNG_ZLIB_VERNUM \
948 "-I (include path) error: see the notes in pngpriv.h"
949 /* This means that when pnglibconf.h was built the copy of zlib.h that it
950 * used is not the same as the one being used here. Because the build of
951 * libpng makes decisions to use inflateInit2 and inflateReset2 based on the
952 * zlib version number and because this affects handling of certain broken
953 * PNG files the -I directives must match.
954 *
955 * The most likely explanation is that you passed a -I in CFLAGS. This will
956 * not work; all the preprocessor directives and in particular all the -I
957 * directives must be in CPPFLAGS.
958 */
959 #endif
960
961 /* This is used for 16-bit gamma tables -- only the top level pointers are
962 * const; this could be changed:
963 */
964 typedef const png_uint_16p * png_const_uint_16pp;
965
966 /* Added to libpng-1.5.7: sRGB conversion tables */
967 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
968 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
969 #ifdef PNG_SIMPLIFIED_READ_SUPPORTED
970 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]);
971 /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value,
972 * 0..65535. This table gives the closest 16-bit answers (no errors).
973 */
974 #endif
975
976 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]);
977 PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]);
978
979 #define PNG_sRGB_FROM_LINEAR(linear) \
980 ((png_byte)(0xff & ((png_sRGB_base[(linear)>>15] \
981 + ((((linear) & 0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8)))
982 /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB
983 * encoded value with maximum error 0.646365. Note that the input is not a
984 * 16-bit value; it has been multiplied by 255! */
985 #endif /* SIMPLIFIED_READ/WRITE */
986
987
988 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */
989 #ifdef __cplusplus
990 extern "C" {
991 #endif /* __cplusplus */
992
993 /* Internal functions; these are not exported from a DLL however because they
994 * are used within several of the C source files they have to be C extern.
995 *
996 * All of these functions must be declared with PNG_INTERNAL_FUNCTION.
997 */
998
999 /* Zlib support */
1000 #define PNG_UNEXPECTED_ZLIB_RETURN (-7)
1001 PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret),
1002 PNG_EMPTY);
1003 /* Used by the zlib handling functions to ensure that z_stream::msg is always
1004 * set before they return.
1005 */
1006
1007 #ifdef PNG_WRITE_SUPPORTED
1008 PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr,
1009 png_compression_bufferp *list),PNG_EMPTY);
1010 /* Free the buffer list used by the compressed write code. */
1011 #endif
1012
1013 #if defined(PNG_FLOATING_POINT_SUPPORTED) && \
1014 !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \
1015 (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \
1016 defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \
1017 defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \
1018 (defined(PNG_sCAL_SUPPORTED) && \
1019 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED))
1020 PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr,
1021 double fp, png_const_charp text),PNG_EMPTY);
1022 #endif
1023
1024 /* Check the user version string for compatibility, returns false if the version
1025 * numbers aren't compatible.
1026 */
1027 PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr,
1028 png_const_charp user_png_ver),PNG_EMPTY);
1029
1030 /* Internal base allocator - no messages, NULL on failure to allocate. This
1031 * does, however, call the application provided allocator and that could call
1032 * png_error (although that would be a bug in the application implementation.)
1033 */
1034 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr,
1035 png_alloc_size_t size),PNG_ALLOCATED);
1036
1037 #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\
1038 defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED)
1039 /* Internal array allocator, outputs no error or warning messages on failure,
1040 * just returns NULL.
1041 */
1042 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr,
1043 int nelements, size_t element_size),PNG_ALLOCATED);
1044
1045 /* The same but an existing array is extended by add_elements. This function
1046 * also memsets the new elements to 0 and copies the old elements. The old
1047 * array is not freed or altered.
1048 */
1049 PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr,
1050 png_const_voidp array, int old_elements, int add_elements,
1051 size_t element_size),PNG_ALLOCATED);
1052 #endif /* text, sPLT or unknown chunks */
1053
1054 /* Magic to create a struct when there is no struct to call the user supplied
1055 * memory allocators. Because error handling has not been set up the memory
1056 * handlers can't safely call png_error, but this is an obscure and undocumented
1057 * restriction so libpng has to assume that the 'free' handler, at least, might
1058 * call png_error.
1059 */
1060 PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct,
1061 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
1062 png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn,
1063 png_free_ptr free_fn),PNG_ALLOCATED);
1064
1065 /* Free memory from internal libpng struct */
1066 PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr),
1067 PNG_EMPTY);
1068
1069 /* Free an allocated jmp_buf (always succeeds) */
1070 PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY);
1071
1072 /* Function to allocate memory for zlib. PNGAPI is disallowed. */
1073 PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size),
1074 PNG_ALLOCATED);
1075
1076 /* Function to free memory for zlib. PNGAPI is disallowed. */
1077 PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY);
1078
1079 /* Next four functions are used internally as callbacks. PNGCBAPI is required
1080 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to
1081 * PNGCBAPI at 1.5.0
1082 */
1083
1084 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr,
1085 png_bytep data, size_t length),PNG_EMPTY);
1086
1087 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1088 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr,
1089 png_bytep buffer, size_t length),PNG_EMPTY);
1090 #endif
1091
1092 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr,
1093 png_bytep data, size_t length),PNG_EMPTY);
1094
1095 #ifdef PNG_WRITE_FLUSH_SUPPORTED
1096 # ifdef PNG_STDIO_SUPPORTED
1097 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr),
1098 PNG_EMPTY);
1099 # endif
1100 #endif
1101
1102 /* Reset the CRC variable */
1103 PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY);
1104
1105 /* Write the "data" buffer to whatever output you are using */
1106 PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr,
1107 png_const_bytep data, size_t length),PNG_EMPTY);
1108
1109 /* Read and check the PNG file signature */
1110 PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr,
1111 png_inforp info_ptr),PNG_EMPTY);
1112
1113 /* Read the chunk header (length + type name) */
1114 PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr),
1115 PNG_EMPTY);
1116
1117 /* Read data from whatever input you are using into the "data" buffer */
1118 PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data,
1119 size_t length),PNG_EMPTY);
1120
1121 /* Read bytes into buf, and update png_ptr->crc */
1122 PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf,
1123 png_uint_32 length),PNG_EMPTY);
1124
1125 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
1126 PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr,
1127 png_uint_32 skip),PNG_EMPTY);
1128
1129 /* Read the CRC from the file and compare it to the libpng calculated CRC */
1130 PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY);
1131
1132 /* Calculate the CRC over a section of data. Note that we are only
1133 * passing a maximum of 64K on systems that have this as a memory limit,
1134 * since this is the maximum buffer size we can specify.
1135 */
1136 PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr,
1137 png_const_bytep ptr, size_t length),PNG_EMPTY);
1138
1139 #ifdef PNG_WRITE_FLUSH_SUPPORTED
1140 PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY);
1141 #endif
1142
1143 /* Write various chunks */
1144
1145 /* Write the IHDR chunk, and update the png_struct with the necessary
1146 * information.
1147 */
1148 PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr,
1149 png_uint_32 width, png_uint_32 height, int bit_depth, int color_type,
1150 int compression_method, int filter_method, int interlace_method),PNG_EMPTY);
1151
1152 PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr,
1153 png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY);
1154
1155 PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr,
1156 png_const_bytep row_data, png_alloc_size_t row_data_length, int flush),
1157 PNG_EMPTY);
1158
1159 PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY);
1160
1161 #ifdef PNG_WRITE_gAMA_SUPPORTED
1162 PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr,
1163 png_fixed_point file_gamma),PNG_EMPTY);
1164 #endif
1165
1166 #ifdef PNG_WRITE_sBIT_SUPPORTED
1167 PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr,
1168 png_const_color_8p sbit, int color_type),PNG_EMPTY);
1169 #endif
1170
1171 #ifdef PNG_WRITE_cHRM_SUPPORTED
1172 PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr,
1173 const png_xy *xy), PNG_EMPTY);
1174 /* The xy value must have been previously validated */
1175 #endif
1176
1177 #ifdef PNG_WRITE_sRGB_SUPPORTED
1178 PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr,
1179 int intent),PNG_EMPTY);
1180 #endif
1181
1182 #ifdef PNG_WRITE_eXIf_SUPPORTED
1183 PNG_INTERNAL_FUNCTION(void,png_write_eXIf,(png_structrp png_ptr,
1184 png_bytep exif, int num_exif),PNG_EMPTY);
1185 #endif
1186
1187 #ifdef PNG_WRITE_iCCP_SUPPORTED
1188 PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr,
1189 png_const_charp name, png_const_bytep profile), PNG_EMPTY);
1190 /* The profile must have been previously validated for correctness, the
1191 * length comes from the first four bytes. Only the base, deflate,
1192 * compression is supported.
1193 */
1194 #endif
1195
1196 #ifdef PNG_WRITE_sPLT_SUPPORTED
1197 PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr,
1198 png_const_sPLT_tp palette),PNG_EMPTY);
1199 #endif
1200
1201 #ifdef PNG_WRITE_tRNS_SUPPORTED
1202 PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr,
1203 png_const_bytep trans, png_const_color_16p values, int number,
1204 int color_type),PNG_EMPTY);
1205 #endif
1206
1207 #ifdef PNG_WRITE_bKGD_SUPPORTED
1208 PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr,
1209 png_const_color_16p values, int color_type),PNG_EMPTY);
1210 #endif
1211
1212 #ifdef PNG_WRITE_hIST_SUPPORTED
1213 PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr,
1214 png_const_uint_16p hist, int num_hist),PNG_EMPTY);
1215 #endif
1216
1217 /* Chunks that have keywords */
1218 #ifdef PNG_WRITE_tEXt_SUPPORTED
1219 PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr,
1220 png_const_charp key, png_const_charp text, size_t text_len),PNG_EMPTY);
1221 #endif
1222
1223 #ifdef PNG_WRITE_zTXt_SUPPORTED
1224 PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp
1225 key, png_const_charp text, int compression),PNG_EMPTY);
1226 #endif
1227
1228 #ifdef PNG_WRITE_iTXt_SUPPORTED
1229 PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr,
1230 int compression, png_const_charp key, png_const_charp lang,
1231 png_const_charp lang_key, png_const_charp text),PNG_EMPTY);
1232 #endif
1233
1234 #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */
1235 PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr,
1236 png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY);
1237 #endif
1238
1239 #ifdef PNG_WRITE_oFFs_SUPPORTED
1240 PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr,
1241 png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY);
1242 #endif
1243
1244 #ifdef PNG_WRITE_pCAL_SUPPORTED
1245 PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr,
1246 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
1247 png_const_charp units, png_charpp params),PNG_EMPTY);
1248 #endif
1249
1250 #ifdef PNG_WRITE_pHYs_SUPPORTED
1251 PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr,
1252 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
1253 int unit_type),PNG_EMPTY);
1254 #endif
1255
1256 #ifdef PNG_WRITE_tIME_SUPPORTED
1257 PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr,
1258 png_const_timep mod_time),PNG_EMPTY);
1259 #endif
1260
1261 #ifdef PNG_WRITE_sCAL_SUPPORTED
1262 PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr,
1263 int unit, png_const_charp width, png_const_charp height),PNG_EMPTY);
1264 #endif
1265
1266 /* Called when finished processing a row of data */
1267 PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr),
1268 PNG_EMPTY);
1269
1270 /* Internal use only. Called before first row of data */
1271 PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr),
1272 PNG_EMPTY);
1273
1274 /* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an
1275 * array of png_ptr->width pixels. If the image is not interlaced or this
1276 * is the final pass this just does a memcpy, otherwise the "display" flag
1277 * is used to determine whether to copy pixels that are not in the current pass.
1278 *
1279 * Because 'png_do_read_interlace' (below) replicates pixels this allows this
1280 * function to achieve the documented 'blocky' appearance during interlaced read
1281 * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row'
1282 * are not changed if they are not in the current pass, when display is 0.
1283 *
1284 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless.
1285 *
1286 * The API always reads from the png_struct row buffer and always assumes that
1287 * it is full width (png_do_read_interlace has already been called.)
1288 *
1289 * This function is only ever used to write to row buffers provided by the
1290 * caller of the relevant libpng API and the row must have already been
1291 * transformed by the read transformations.
1292 *
1293 * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed
1294 * bitmasks for use within the code, otherwise runtime generated masks are used.
1295 * The default is compile time masks.
1296 */
1297 #ifndef PNG_USE_COMPILE_TIME_MASKS
1298 # define PNG_USE_COMPILE_TIME_MASKS 1
1299 #endif
1300 PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr,
1301 png_bytep row, int display),PNG_EMPTY);
1302
1303 #ifdef PNG_READ_INTERLACING_SUPPORTED
1304 /* Expand an interlaced row: the 'row_info' describes the pass data that has
1305 * been read in and must correspond to the pixels in 'row', the pixels are
1306 * expanded (moved apart) in 'row' to match the final layout, when doing this
1307 * the pixels are *replicated* to the intervening space. This is essential for
1308 * the correct operation of png_combine_row, above.
1309 */
1310 PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info,
1311 png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY);
1312 #endif
1313
1314 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
1315
1316 #ifdef PNG_WRITE_INTERLACING_SUPPORTED
1317 /* Grab pixels out of a row for an interlaced pass */
1318 PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info,
1319 png_bytep row, int pass),PNG_EMPTY);
1320 #endif
1321
1322 /* Unfilter a row: check the filter value before calling this, there is no point
1323 * calling it for PNG_FILTER_VALUE_NONE.
1324 */
1325 PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop
1326 row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY);
1327
1328 #if PNG_ARM_NEON_OPT > 0
1329 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info,
1330 png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1331 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop
1332 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1333 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop
1334 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1335 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_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_avg4_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_paeth3_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_paeth4_neon,(png_row_infop
1342 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1343 #endif
1344
1345 #if PNG_MIPS_MSA_OPT > 0
1346 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_msa,(png_row_infop row_info,
1347 png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1348 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_msa,(png_row_infop
1349 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1350 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_msa,(png_row_infop
1351 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1352 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_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_avg4_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_paeth3_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_paeth4_msa,(png_row_infop
1359 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1360 #endif
1361
1362 #if PNG_POWERPC_VSX_OPT > 0
1363 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_vsx,(png_row_infop row_info,
1364 png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1365 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_vsx,(png_row_infop
1366 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1367 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_vsx,(png_row_infop
1368 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1369 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_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_avg4_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_paeth3_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_paeth4_vsx,(png_row_infop
1376 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1377 #endif
1378
1379 #if PNG_INTEL_SSE_IMPLEMENTATION > 0
1380 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_sse2,(png_row_infop
1381 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1382 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_sse2,(png_row_infop
1383 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1384 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_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_avg4_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_paeth3_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_paeth4_sse2,(png_row_infop
1391 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1392 #endif
1393
1394 /* Choose the best filter to use and filter the row data */
1395 PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr,
1396 png_row_infop row_info),PNG_EMPTY);
1397
1398 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1399 PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr,
1400 png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY);
1401 /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer
1402 * is NULL the function checks, instead, for the end of the stream. In this
1403 * case a benign error will be issued if the stream end is not found or if
1404 * extra data has to be consumed.
1405 */
1406 PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr),
1407 PNG_EMPTY);
1408 /* This cleans up when the IDAT LZ stream does not end when the last image
1409 * byte is read; there is still some pending input.
1410 */
1411
1412 PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr),
1413 PNG_EMPTY);
1414 /* Finish a row while reading, dealing with interlacing passes, etc. */
1415 #endif /* SEQUENTIAL_READ */
1416
1417 /* Initialize the row buffers, etc. */
1418 PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY);
1419
1420 #if ZLIB_VERNUM >= 0x1240
1421 PNG_INTERNAL_FUNCTION(int,png_zlib_inflate,(png_structrp png_ptr, int flush),
1422 PNG_EMPTY);
1423 # define PNG_INFLATE(pp, flush) png_zlib_inflate(pp, flush)
1424 #else /* Zlib < 1.2.4 */
1425 # define PNG_INFLATE(pp, flush) inflate(&(pp)->zstream, flush)
1426 #endif /* Zlib < 1.2.4 */
1427
1428 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
1429 /* Optional call to update the users info structure */
1430 PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr,
1431 png_inforp info_ptr),PNG_EMPTY);
1432 #endif
1433
1434 /* Shared transform functions, defined in pngtran.c */
1435 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
1436 defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
1437 PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info,
1438 png_bytep row, int at_start),PNG_EMPTY);
1439 #endif
1440
1441 #ifdef PNG_16BIT_SUPPORTED
1442 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
1443 PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info,
1444 png_bytep row),PNG_EMPTY);
1445 #endif
1446 #endif
1447
1448 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
1449 defined(PNG_WRITE_PACKSWAP_SUPPORTED)
1450 PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info,
1451 png_bytep row),PNG_EMPTY);
1452 #endif
1453
1454 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
1455 PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info,
1456 png_bytep row),PNG_EMPTY);
1457 #endif
1458
1459 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
1460 PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info,
1461 png_bytep row),PNG_EMPTY);
1462 #endif
1463
1464 /* The following decodes the appropriate chunks, and does error correction,
1465 * then calls the appropriate callback for the chunk if it is valid.
1466 */
1467
1468 /* Decode the IHDR chunk */
1469 PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr,
1470 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1471 PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr,
1472 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1473 PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr,
1474 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1475
1476 #ifdef PNG_READ_bKGD_SUPPORTED
1477 PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr,
1478 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1479 #endif
1480
1481 #ifdef PNG_READ_cHRM_SUPPORTED
1482 PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr,
1483 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1484 #endif
1485
1486 #ifdef PNG_READ_eXIf_SUPPORTED
1487 PNG_INTERNAL_FUNCTION(void,png_handle_eXIf,(png_structrp png_ptr,
1488 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1489 #endif
1490
1491 #ifdef PNG_READ_gAMA_SUPPORTED
1492 PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr,
1493 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1494 #endif
1495
1496 #ifdef PNG_READ_hIST_SUPPORTED
1497 PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr,
1498 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1499 #endif
1500
1501 #ifdef PNG_READ_iCCP_SUPPORTED
1502 PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr,
1503 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1504 #endif /* READ_iCCP */
1505
1506 #ifdef PNG_READ_iTXt_SUPPORTED
1507 PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr,
1508 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1509 #endif
1510
1511 #ifdef PNG_READ_oFFs_SUPPORTED
1512 PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr,
1513 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1514 #endif
1515
1516 #ifdef PNG_READ_pCAL_SUPPORTED
1517 PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr,
1518 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1519 #endif
1520
1521 #ifdef PNG_READ_pHYs_SUPPORTED
1522 PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr,
1523 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1524 #endif
1525
1526 #ifdef PNG_READ_sBIT_SUPPORTED
1527 PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr,
1528 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1529 #endif
1530
1531 #ifdef PNG_READ_sCAL_SUPPORTED
1532 PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr,
1533 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1534 #endif
1535
1536 #ifdef PNG_READ_sPLT_SUPPORTED
1537 PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr,
1538 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1539 #endif /* READ_sPLT */
1540
1541 #ifdef PNG_READ_sRGB_SUPPORTED
1542 PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr,
1543 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1544 #endif
1545
1546 #ifdef PNG_READ_tEXt_SUPPORTED
1547 PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr,
1548 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1549 #endif
1550
1551 #ifdef PNG_READ_tIME_SUPPORTED
1552 PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr,
1553 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1554 #endif
1555
1556 #ifdef PNG_READ_tRNS_SUPPORTED
1557 PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr,
1558 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1559 #endif
1560
1561 #ifdef PNG_READ_zTXt_SUPPORTED
1562 PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr,
1563 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1564 #endif
1565
1566 PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_const_structrp png_ptr,
1567 const png_uint_32 chunk_name),PNG_EMPTY);
1568
1569 PNG_INTERNAL_FUNCTION(void,png_check_chunk_length,(png_const_structrp png_ptr,
1570 const png_uint_32 chunk_length),PNG_EMPTY);
1571
1572 PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr,
1573 png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY);
1574 /* This is the function that gets called for unknown chunks. The 'keep'
1575 * argument is either non-zero for a known chunk that has been set to be
1576 * handled as unknown or zero for an unknown chunk. By default the function
1577 * just skips the chunk or errors out if it is critical.
1578 */
1579
1580 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\
1581 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
1582 PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling,
1583 (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY);
1584 /* Exactly as the API png_handle_as_unknown() except that the argument is a
1585 * 32-bit chunk name, not a string.
1586 */
1587 #endif /* READ_UNKNOWN_CHUNKS || HANDLE_AS_UNKNOWN */
1588
1589 /* Handle the transformations for reading and writing */
1590 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
1591 PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr,
1592 png_row_infop row_info),PNG_EMPTY);
1593 #endif
1594 #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
1595 PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr,
1596 png_row_infop row_info),PNG_EMPTY);
1597 #endif
1598
1599 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
1600 PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr),
1601 PNG_EMPTY);
1602 #endif
1603
1604 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1605 PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr,
1606 png_inforp info_ptr),PNG_EMPTY);
1607 PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr,
1608 png_inforp info_ptr),PNG_EMPTY);
1609 PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY);
1610 PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr),
1611 PNG_EMPTY);
1612 PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr,
1613 png_bytep buffer, size_t buffer_length),PNG_EMPTY);
1614 PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY);
1615 PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr,
1616 png_bytep buffer, size_t buffer_length),PNG_EMPTY);
1617 PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr),
1618 PNG_EMPTY);
1619 PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr,
1620 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1621 PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr,
1622 png_inforp info_ptr),PNG_EMPTY);
1623 PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr,
1624 png_inforp info_ptr),PNG_EMPTY);
1625 PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr,
1626 png_bytep row),PNG_EMPTY);
1627 PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr,
1628 png_inforp info_ptr),PNG_EMPTY);
1629 PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr,
1630 png_inforp info_ptr),PNG_EMPTY);
1631 PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr),
1632 PNG_EMPTY);
1633 # ifdef PNG_READ_tEXt_SUPPORTED
1634 PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr,
1635 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1636 PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr,
1637 png_inforp info_ptr),PNG_EMPTY);
1638 # endif
1639 # ifdef PNG_READ_zTXt_SUPPORTED
1640 PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr,
1641 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1642 PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr,
1643 png_inforp info_ptr),PNG_EMPTY);
1644 # endif
1645 # ifdef PNG_READ_iTXt_SUPPORTED
1646 PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr,
1647 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1648 PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr,
1649 png_inforp info_ptr),PNG_EMPTY);
1650 # endif
1651
1652 #endif /* PROGRESSIVE_READ */
1653
1654 /* Added at libpng version 1.6.0 */
1655 #ifdef PNG_GAMMA_SUPPORTED
1656 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr,
1657 png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY);
1658 /* Set the colorspace gamma with a value provided by the application or by
1659 * the gAMA chunk on read. The value will override anything set by an ICC
1660 * profile.
1661 */
1662
1663 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr,
1664 png_inforp info_ptr), PNG_EMPTY);
1665 /* Synchronize the info 'valid' flags with the colorspace */
1666
1667 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr,
1668 png_inforp info_ptr), PNG_EMPTY);
1669 /* Copy the png_struct colorspace to the info_struct and call the above to
1670 * synchronize the flags. Checks for NULL info_ptr and does nothing.
1671 */
1672 #endif
1673
1674 /* Added at libpng version 1.4.0 */
1675 #ifdef PNG_COLORSPACE_SUPPORTED
1676 /* These internal functions are for maintaining the colorspace structure within
1677 * a png_info or png_struct (or, indeed, both).
1678 */
1679 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities,
1680 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy,
1681 int preferred), PNG_EMPTY);
1682
1683 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints,
1684 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ,
1685 int preferred), PNG_EMPTY);
1686
1687 #ifdef PNG_sRGB_SUPPORTED
1688 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr,
1689 png_colorspacerp colorspace, int intent), PNG_EMPTY);
1690 /* This does set the colorspace gAMA and cHRM values too, but doesn't set the
1691 * flags to write them, if it returns false there was a problem and an error
1692 * message has already been output (but the colorspace may still need to be
1693 * synced to record the invalid flag).
1694 */
1695 #endif /* sRGB */
1696
1697 #ifdef PNG_iCCP_SUPPORTED
1698 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr,
1699 png_colorspacerp colorspace, png_const_charp name,
1700 png_uint_32 profile_length, png_const_bytep profile, int color_type),
1701 PNG_EMPTY);
1702 /* The 'name' is used for information only */
1703
1704 /* Routines for checking parts of an ICC profile. */
1705 #ifdef PNG_READ_iCCP_SUPPORTED
1706 PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr,
1707 png_colorspacerp colorspace, png_const_charp name,
1708 png_uint_32 profile_length), PNG_EMPTY);
1709 #endif /* READ_iCCP */
1710 PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr,
1711 png_colorspacerp colorspace, png_const_charp name,
1712 png_uint_32 profile_length,
1713 png_const_bytep profile /* first 132 bytes only */, int color_type),
1714 PNG_EMPTY);
1715 PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr,
1716 png_colorspacerp colorspace, png_const_charp name,
1717 png_uint_32 profile_length,
1718 png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY);
1719 #ifdef PNG_sRGB_SUPPORTED
1720 PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,(
1721 png_const_structrp png_ptr, png_colorspacerp colorspace,
1722 png_const_bytep profile, uLong adler), PNG_EMPTY);
1723 /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may
1724 * be zero to indicate that it is not available. It is used, if provided,
1725 * as a fast check on the profile when checking to see if it is sRGB.
1726 */
1727 #endif
1728 #endif /* iCCP */
1729
1730 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
1731 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients,
1732 (png_structrp png_ptr), PNG_EMPTY);
1733 /* Set the rgb_to_gray coefficients from the colorspace Y values */
1734 #endif /* READ_RGB_TO_GRAY */
1735 #endif /* COLORSPACE */
1736
1737 /* Added at libpng version 1.4.0 */
1738 PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr,
1739 png_uint_32 width, png_uint_32 height, int bit_depth,
1740 int color_type, int interlace_type, int compression_type,
1741 int filter_type),PNG_EMPTY);
1742
1743 /* Added at libpng version 1.5.10 */
1744 #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \
1745 defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED)
1746 PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes,
1747 (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY);
1748 #endif
1749
1750 #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
1751 PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr,
1752 png_const_charp name),PNG_NORETURN);
1753 #endif
1754
1755 /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite
1756 * the end. Always leaves the buffer nul terminated. Never errors out (and
1757 * there is no error code.)
1758 */
1759 PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize,
1760 size_t pos, png_const_charp string),PNG_EMPTY);
1761
1762 /* Various internal functions to handle formatted warning messages, currently
1763 * only implemented for warnings.
1764 */
1765 #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)
1766 /* Utility to dump an unsigned value into a buffer, given a start pointer and
1767 * and end pointer (which should point just *beyond* the end of the buffer!)
1768 * Returns the pointer to the start of the formatted string. This utility only
1769 * does unsigned values.
1770 */
1771 PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start,
1772 png_charp end, int format, png_alloc_size_t number),PNG_EMPTY);
1773
1774 /* Convenience macro that takes an array: */
1775 #define PNG_FORMAT_NUMBER(buffer,format,number) \
1776 png_format_number(buffer, buffer + (sizeof buffer), format, number)
1777
1778 /* Suggested size for a number buffer (enough for 64 bits and a sign!) */
1779 #define PNG_NUMBER_BUFFER_SIZE 24
1780
1781 /* These are the integer formats currently supported, the name is formed from
1782 * the standard printf(3) format string.
1783 */
1784 #define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */
1785 #define PNG_NUMBER_FORMAT_02u 2
1786 #define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */
1787 #define PNG_NUMBER_FORMAT_02d 2
1788 #define PNG_NUMBER_FORMAT_x 3
1789 #define PNG_NUMBER_FORMAT_02x 4
1790 #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */
1791 #endif
1792
1793 #ifdef PNG_WARNINGS_SUPPORTED
1794 /* New defines and members adding in libpng-1.5.4 */
1795 # define PNG_WARNING_PARAMETER_SIZE 32
1796 # define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */
1797
1798 /* An l-value of this type has to be passed to the APIs below to cache the
1799 * values of the parameters to a formatted warning message.
1800 */
1801 typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][
1802 PNG_WARNING_PARAMETER_SIZE];
1803
1804 PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p,
1805 int number, png_const_charp string),PNG_EMPTY);
1806 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters,
1807 * including the trailing '\0'.
1808 */
1809 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned,
1810 (png_warning_parameters p, int number, int format, png_alloc_size_t value),
1811 PNG_EMPTY);
1812 /* Use png_alloc_size_t because it is an unsigned type as big as any we
1813 * need to output. Use the following for a signed value.
1814 */
1815 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed,
1816 (png_warning_parameters p, int number, int format, png_int_32 value),
1817 PNG_EMPTY);
1818
1819 PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr,
1820 png_warning_parameters p, png_const_charp message),PNG_EMPTY);
1821 /* 'message' follows the X/Open approach of using @1, @2 to insert
1822 * parameters previously supplied using the above functions. Errors in
1823 * specifying the parameters will simply result in garbage substitutions.
1824 */
1825 #endif
1826
1827 #ifdef PNG_BENIGN_ERRORS_SUPPORTED
1828 /* Application errors (new in 1.6); use these functions (declared below) for
1829 * errors in the parameters or order of API function calls on read. The
1830 * 'warning' should be used for an error that can be handled completely; the
1831 * 'error' for one which can be handled safely but which may lose application
1832 * information or settings.
1833 *
1834 * By default these both result in a png_error call prior to release, while in a
1835 * released version the 'warning' is just a warning. However if the application
1836 * explicitly disables benign errors (explicitly permitting the code to lose
1837 * information) they both turn into warnings.
1838 *
1839 * If benign errors aren't supported they end up as the corresponding base call
1840 * (png_warning or png_error.)
1841 */
1842 PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr,
1843 png_const_charp message),PNG_EMPTY);
1844 /* The application provided invalid parameters to an API function or called
1845 * an API function at the wrong time, libpng can completely recover.
1846 */
1847
1848 PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr,
1849 png_const_charp message),PNG_EMPTY);
1850 /* As above but libpng will ignore the call, or attempt some other partial
1851 * recovery from the error.
1852 */
1853 #else
1854 # define png_app_warning(pp,s) png_warning(pp,s)
1855 # define png_app_error(pp,s) png_error(pp,s)
1856 #endif
1857
1858 PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr,
1859 png_const_charp message, int error),PNG_EMPTY);
1860 /* Report a recoverable issue in chunk data. On read this is used to report
1861 * a problem found while reading a particular chunk and the
1862 * png_chunk_benign_error or png_chunk_warning function is used as
1863 * appropriate. On write this is used to report an error that comes from
1864 * data set via an application call to a png_set_ API and png_app_error or
1865 * png_app_warning is used as appropriate.
1866 *
1867 * The 'error' parameter must have one of the following values:
1868 */
1869 #define PNG_CHUNK_WARNING 0 /* never an error */
1870 #define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */
1871 #define PNG_CHUNK_ERROR 2 /* always an error */
1872
1873 /* ASCII to FP interfaces, currently only implemented if sCAL
1874 * support is required.
1875 */
1876 #if defined(PNG_sCAL_SUPPORTED)
1877 /* MAX_DIGITS is actually the maximum number of characters in an sCAL
1878 * width or height, derived from the precision (number of significant
1879 * digits - a build time settable option) and assumptions about the
1880 * maximum ridiculous exponent.
1881 */
1882 #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/)
1883
1884 #ifdef PNG_FLOATING_POINT_SUPPORTED
1885 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr,
1886 png_charp ascii, size_t size, double fp, unsigned int precision),
1887 PNG_EMPTY);
1888 #endif /* FLOATING_POINT */
1889
1890 #ifdef PNG_FIXED_POINT_SUPPORTED
1891 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr,
1892 png_charp ascii, size_t size, png_fixed_point fp),PNG_EMPTY);
1893 #endif /* FIXED_POINT */
1894 #endif /* sCAL */
1895
1896 #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED)
1897 /* An internal API to validate the format of a floating point number.
1898 * The result is the index of the next character. If the number is
1899 * not valid it will be the index of a character in the supposed number.
1900 *
1901 * The format of a number is defined in the PNG extensions specification
1902 * and this API is strictly conformant to that spec, not anyone elses!
1903 *
1904 * The format as a regular expression is:
1905 *
1906 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)?
1907 *
1908 * or:
1909 *
1910 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)?
1911 *
1912 * The complexity is that either integer or fraction must be present and the
1913 * fraction is permitted to have no digits only if the integer is present.
1914 *
1915 * NOTE: The dangling E problem.
1916 * There is a PNG valid floating point number in the following:
1917 *
1918 * PNG floating point numbers are not greedy.
1919 *
1920 * Working this out requires *TWO* character lookahead (because of the
1921 * sign), the parser does not do this - it will fail at the 'r' - this
1922 * doesn't matter for PNG sCAL chunk values, but it requires more care
1923 * if the value were ever to be embedded in something more complex. Use
1924 * ANSI-C strtod if you need the lookahead.
1925 */
1926 /* State table for the parser. */
1927 #define PNG_FP_INTEGER 0 /* before or in integer */
1928 #define PNG_FP_FRACTION 1 /* before or in fraction */
1929 #define PNG_FP_EXPONENT 2 /* before or in exponent */
1930 #define PNG_FP_STATE 3 /* mask for the above */
1931 #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */
1932 #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */
1933 #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */
1934 #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */
1935 #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */
1936
1937 /* These three values don't affect the parser. They are set but not used.
1938 */
1939 #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */
1940 #define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */
1941 #define PNG_FP_NONZERO 256 /* A non-zero value */
1942 #define PNG_FP_STICKY 448 /* The above three flags */
1943
1944 /* This is available for the caller to store in 'state' if required. Do not
1945 * call the parser after setting it (the parser sometimes clears it.)
1946 */
1947 #define PNG_FP_INVALID 512 /* Available for callers as a distinct value */
1948
1949 /* Result codes for the parser (boolean - true meants ok, false means
1950 * not ok yet.)
1951 */
1952 #define PNG_FP_MAYBE 0 /* The number may be valid in the future */
1953 #define PNG_FP_OK 1 /* The number is valid */
1954
1955 /* Tests on the sticky non-zero and negative flags. To pass these checks
1956 * the state must also indicate that the whole number is valid - this is
1957 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this
1958 * is equivalent to PNG_FP_OK above.)
1959 */
1960 #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO)
1961 /* NZ_MASK: the string is valid and a non-zero negative value */
1962 #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO)
1963 /* Z MASK: the string is valid and a non-zero value. */
1964 /* PNG_FP_SAW_DIGIT: the string is valid. */
1965 #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT)
1966 #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK)
1967 #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK)
1968
1969 /* The actual parser. This can be called repeatedly. It updates
1970 * the index into the string and the state variable (which must
1971 * be initialized to 0). It returns a result code, as above. There
1972 * is no point calling the parser any more if it fails to advance to
1973 * the end of the string - it is stuck on an invalid character (or
1974 * terminated by '\0').
1975 *
1976 * Note that the pointer will consume an E or even an E+ and then leave
1977 * a 'maybe' state even though a preceding integer.fraction is valid.
1978 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was
1979 * a valid number. It's possible to recover from this by calling
1980 * the parser again (from the start, with state 0) but with a string
1981 * that omits the last character (i.e. set the size to the index of
1982 * the problem character.) This has not been tested within libpng.
1983 */
1984 PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string,
1985 size_t size, int *statep, png_size_tp whereami),PNG_EMPTY);
1986
1987 /* This is the same but it checks a complete string and returns true
1988 * only if it just contains a floating point number. As of 1.5.4 this
1989 * function also returns the state at the end of parsing the number if
1990 * it was valid (otherwise it returns 0.) This can be used for testing
1991 * for negative or zero values using the sticky flag.
1992 */
1993 PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string,
1994 size_t size),PNG_EMPTY);
1995 #endif /* pCAL || sCAL */
1996
1997 #if defined(PNG_GAMMA_SUPPORTED) ||\
1998 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED)
1999 /* Added at libpng version 1.5.0 */
2000 /* This is a utility to provide a*times/div (rounded) and indicate
2001 * if there is an overflow. The result is a boolean - false (0)
2002 * for overflow, true (1) if no overflow, in which case *res
2003 * holds the result.
2004 */
2005 PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a,
2006 png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY);
2007 #endif
2008
2009 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED)
2010 /* Same deal, but issue a warning on overflow and return 0. */
2011 PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn,
2012 (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by,
2013 png_int_32 divided_by),PNG_EMPTY);
2014 #endif
2015
2016 #ifdef PNG_GAMMA_SUPPORTED
2017 /* Calculate a reciprocal - used for gamma values. This returns
2018 * 0 if the argument is 0 in order to maintain an undefined value;
2019 * there are no warnings.
2020 */
2021 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a),
2022 PNG_EMPTY);
2023
2024 #ifdef PNG_READ_GAMMA_SUPPORTED
2025 /* The same but gives a reciprocal of the product of two fixed point
2026 * values. Accuracy is suitable for gamma calculations but this is
2027 * not exact - use png_muldiv for that. Only required at present on read.
2028 */
2029 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a,
2030 png_fixed_point b),PNG_EMPTY);
2031 #endif
2032
2033 /* Return true if the gamma value is significantly different from 1.0 */
2034 PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value),
2035 PNG_EMPTY);
2036 #endif
2037
2038 #ifdef PNG_READ_GAMMA_SUPPORTED
2039 /* Internal fixed point gamma correction. These APIs are called as
2040 * required to convert single values - they don't need to be fast,
2041 * they are not used when processing image pixel values.
2042 *
2043 * While the input is an 'unsigned' value it must actually be the
2044 * correct bit value - 0..255 or 0..65535 as required.
2045 */
2046 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr,
2047 unsigned int value, png_fixed_point gamma_value),PNG_EMPTY);
2048 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value,
2049 png_fixed_point gamma_value),PNG_EMPTY);
2050 PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value,
2051 png_fixed_point gamma_value),PNG_EMPTY);
2052 PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr),
2053 PNG_EMPTY);
2054 PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr,
2055 int bit_depth),PNG_EMPTY);
2056 #endif
2057
2058 /* SIMPLIFIED READ/WRITE SUPPORT */
2059 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
2060 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
2061 /* The internal structure that png_image::opaque points to. */
2062 typedef struct png_control
2063 {
2064 png_structp png_ptr;
2065 png_infop info_ptr;
2066 png_voidp error_buf; /* Always a jmp_buf at present. */
2067
2068 png_const_bytep memory; /* Memory buffer. */
2069 size_t size; /* Size of the memory buffer. */
2070
2071 unsigned int for_write :1; /* Otherwise it is a read structure */
2072 unsigned int owned_file :1; /* We own the file in io_ptr */
2073 } png_control;
2074
2075 /* Return the pointer to the jmp_buf from a png_control: necessary because C
2076 * does not reveal the type of the elements of jmp_buf.
2077 */
2078 #ifdef __cplusplus
2079 # define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0])
2080 #else
2081 # define png_control_jmp_buf(pc) ((pc)->error_buf)
2082 #endif
2083
2084 /* Utility to safely execute a piece of libpng code catching and logging any
2085 * errors that might occur. Returns true on success, false on failure (either
2086 * of the function or as a result of a png_error.)
2087 */
2088 PNG_INTERNAL_CALLBACK(void,png_safe_error,(png_structp png_ptr,
2089 png_const_charp error_message),PNG_NORETURN);
2090
2091 #ifdef PNG_WARNINGS_SUPPORTED
2092 PNG_INTERNAL_CALLBACK(void,png_safe_warning,(png_structp png_ptr,
2093 png_const_charp warning_message),PNG_EMPTY);
2094 #else
2095 # define png_safe_warning 0/*dummy argument*/
2096 #endif
2097
2098 PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image,
2099 int (*function)(png_voidp), png_voidp arg),PNG_EMPTY);
2100
2101 /* Utility to log an error; this also cleans up the png_image; the function
2102 * always returns 0 (false).
2103 */
2104 PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image,
2105 png_const_charp error_message),PNG_EMPTY);
2106
2107 #ifndef PNG_SIMPLIFIED_READ_SUPPORTED
2108 /* png_image_free is used by the write code but not exported */
2109 PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY);
2110 #endif /* !SIMPLIFIED_READ */
2111
2112 #endif /* SIMPLIFIED READ/WRITE */
2113
2114 /* These are initialization functions for hardware specific PNG filter
2115 * optimizations; list these here then select the appropriate one at compile
2116 * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined
2117 * the generic code is used.
2118 */
2119 #ifdef PNG_FILTER_OPTIMIZATIONS
2120 PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr,
2121 unsigned int bpp), PNG_EMPTY);
2122 /* Just declare the optimization that will be used */
2123 #else
2124 /* List *all* the possible optimizations here - this branch is required if
2125 * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in
2126 * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing.
2127 */
2128 # if PNG_ARM_NEON_OPT > 0
2129 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon,
2130 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
2131 #endif
2132
2133 #if PNG_MIPS_MSA_OPT > 0
2134 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_msa,
2135 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
2136 #endif
2137
2138 # if PNG_INTEL_SSE_IMPLEMENTATION > 0
2139 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_sse2,
2140 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
2141 # endif
2142 #endif
2143
2144 PNG_INTERNAL_FUNCTION(png_uint_32, png_check_keyword, (png_structrp png_ptr,
2145 png_const_charp key, png_bytep new_key), PNG_EMPTY);
2146
2147 /* Maintainer: Put new private prototypes here ^ */
2148
2149 #include "pngdebug.h"
2150
2151 #ifdef __cplusplus
2152 }
2153 #endif
2154
2155 #endif /* PNG_VERSION_INFO_ONLY */
2156 #endif /* PNGPRIV_H */