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 1.6.32 [August 24, 2017]
33 * Copyright (c) 1998-2002,2004,2006-2017 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 # endif
242 # endif
243 #endif
244
245 #if PNG_INTEL_SSE_OPT > 0
246 # ifndef PNG_INTEL_SSE_IMPLEMENTATION
247 # if defined(__SSE4_1__) || defined(__AVX__)
248 /* We are not actually using AVX, but checking for AVX is the best
249 way we can detect SSE4.1 and SSSE3 on MSVC.
250 */
251 # define PNG_INTEL_SSE_IMPLEMENTATION 3
252 # elif defined(__SSSE3__)
253 # define PNG_INTEL_SSE_IMPLEMENTATION 2
254 # elif defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \
255 (defined(_M_IX86_FP) && _M_IX86_FP >= 2)
256 # define PNG_INTEL_SSE_IMPLEMENTATION 1
257 # else
258 # define PNG_INTEL_SSE_IMPLEMENTATION 0
259 # endif
260 # endif
261
262 # if PNG_INTEL_SSE_IMPLEMENTATION > 0
263 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_sse2
264 # endif
265 #endif
266
267 #if PNG_MIPS_MSA_OPT > 0
268 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_msa
269 # ifndef PNG_MIPS_MSA_IMPLEMENTATION
270 # if defined(__mips_msa)
271 # if defined(__clang__)
272 # elif defined(__GNUC__)
273 # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7)
274 # define PNG_MIPS_MSA_IMPLEMENTATION 2
275 # endif /* no GNUC support */
276 # endif /* __GNUC__ */
277 # else /* !defined __mips_msa */
278 # define PNG_MIPS_MSA_IMPLEMENTATION 2
279 # endif /* __mips_msa */
280 # endif /* !PNG_MIPS_MSA_IMPLEMENTATION */
281
282 # ifndef PNG_MIPS_MSA_IMPLEMENTATION
283 # define PNG_MIPS_MSA_IMPLEMENTATION 1
284 # endif
285 #endif /* PNG_MIPS_MSA_OPT > 0 */
286
287 #if PNG_POWERPC_VSX_OPT > 0
288 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_vsx
289 # define PNG_POWERPC_VSX_IMPLEMENTATION 1
290 #endif
291
292
293 /* Is this a build of a DLL where compilation of the object modules requires
294 * different preprocessor settings to those required for a simple library? If
295 * so PNG_BUILD_DLL must be set.
296 *
297 * If libpng is used inside a DLL but that DLL does not export the libpng APIs
298 * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a
299 * static library of libpng then link the DLL against that.
300 */
301 #ifndef PNG_BUILD_DLL
302 # ifdef DLL_EXPORT
303 /* This is set by libtool when files are compiled for a DLL; libtool
304 * always compiles twice, even on systems where it isn't necessary. Set
305 * PNG_BUILD_DLL in case it is necessary:
306 */
307 # define PNG_BUILD_DLL
308 # else
309 # ifdef _WINDLL
310 /* This is set by the Microsoft Visual Studio IDE in projects that
311 * build a DLL. It can't easily be removed from those projects (it
312 * isn't visible in the Visual Studio UI) so it is a fairly reliable
313 * indication that PNG_IMPEXP needs to be set to the DLL export
314 * attributes.
315 */
316 # define PNG_BUILD_DLL
317 # else
318 # ifdef __DLL__
319 /* This is set by the Borland C system when compiling for a DLL
320 * (as above.)
321 */
322 # define PNG_BUILD_DLL
323 # else
324 /* Add additional compiler cases here. */
325 # endif
326 # endif
327 # endif
328 #endif /* Setting PNG_BUILD_DLL if required */
329
330 /* See pngconf.h for more details: the builder of the library may set this on
331 * the command line to the right thing for the specific compilation system or it
332 * may be automagically set above (at present we know of no system where it does
333 * need to be set on the command line.)
334 *
335 * PNG_IMPEXP must be set here when building the library to prevent pngconf.h
336 * setting it to the "import" setting for a DLL build.
337 */
338 #ifndef PNG_IMPEXP
339 # ifdef PNG_BUILD_DLL
340 # define PNG_IMPEXP PNG_DLL_EXPORT
341 # else
342 /* Not building a DLL, or the DLL doesn't require specific export
343 * definitions.
344 */
345 # define PNG_IMPEXP
346 # endif
347 #endif
348
349 /* No warnings for private or deprecated functions in the build: */
350 #ifndef PNG_DEPRECATED
351 # define PNG_DEPRECATED
352 #endif
353 #ifndef PNG_PRIVATE
354 # define PNG_PRIVATE
355 #endif
356
357 /* Symbol preprocessing support.
358 *
359 * To enable listing global, but internal, symbols the following macros should
360 * always be used to declare an extern data or function object in this file.
361 */
362 #ifndef PNG_INTERNAL_DATA
363 # define PNG_INTERNAL_DATA(type, name, array) PNG_LINKAGE_DATA type name array
364 #endif
365
366 #ifndef PNG_INTERNAL_FUNCTION
367 # define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\
368 PNG_LINKAGE_FUNCTION PNG_FUNCTION(type, name, args, PNG_EMPTY attributes)
369 #endif
370
371 #ifndef PNG_INTERNAL_CALLBACK
372 # define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\
373 PNG_LINKAGE_CALLBACK PNG_FUNCTION(type, (PNGCBAPI name), args,\
374 PNG_EMPTY attributes)
375 #endif
376
377 /* If floating or fixed point APIs are disabled they may still be compiled
378 * internally. To handle this make sure they are declared as the appropriate
379 * internal extern function (otherwise the symbol prefixing stuff won't work and
380 * the functions will be used without definitions.)
381 *
382 * NOTE: although all the API functions are declared here they are not all
383 * actually built! Because the declarations are still made it is necessary to
384 * fake out types that they depend on.
385 */
386 #ifndef PNG_FP_EXPORT
387 # ifndef PNG_FLOATING_POINT_SUPPORTED
388 # define PNG_FP_EXPORT(ordinal, type, name, args)\
389 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
390 # ifndef PNG_VERSION_INFO_ONLY
391 typedef struct png_incomplete png_double;
392 typedef png_double* png_doublep;
393 typedef const png_double* png_const_doublep;
394 typedef png_double** png_doublepp;
395 # endif
396 # endif
397 #endif
398 #ifndef PNG_FIXED_EXPORT
399 # ifndef PNG_FIXED_POINT_SUPPORTED
400 # define PNG_FIXED_EXPORT(ordinal, type, name, args)\
401 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
402 # endif
403 #endif
404
405 #include "png.h"
406
407 /* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */
408 #ifndef PNG_DLL_EXPORT
409 # define PNG_DLL_EXPORT
410 #endif
411
412 /* This is a global switch to set the compilation for an installed system
413 * (a release build). It can be set for testing debug builds to ensure that
414 * they will compile when the build type is switched to RC or STABLE, the
415 * default is just to use PNG_LIBPNG_BUILD_BASE_TYPE. Set this in CPPFLAGS
416 * with either:
417 *
418 * -DPNG_RELEASE_BUILD Turns on the release compile path
419 * -DPNG_RELEASE_BUILD=0 Turns it off
420 * or in your pngusr.h with
421 * #define PNG_RELEASE_BUILD=1 Turns on the release compile path
422 * #define PNG_RELEASE_BUILD=0 Turns it off
423 */
424 #ifndef PNG_RELEASE_BUILD
425 # define PNG_RELEASE_BUILD (PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC)
426 #endif
427
428 /* SECURITY and SAFETY:
429 *
430 * libpng is built with support for internal limits on image dimensions and
431 * memory usage. These are documented in scripts/pnglibconf.dfa of the
432 * source and recorded in the machine generated header file pnglibconf.h.
433 */
434
435 /* If you are running on a machine where you cannot allocate more
436 * than 64K of memory at once, uncomment this. While libpng will not
437 * normally need that much memory in a chunk (unless you load up a very
438 * large file), zlib needs to know how big of a chunk it can use, and
439 * libpng thus makes sure to check any memory allocation to verify it
440 * will fit into memory.
441 *
442 * zlib provides 'MAXSEG_64K' which, if defined, indicates the
443 * same limit and pngconf.h (already included) sets the limit
444 * if certain operating systems are detected.
445 */
446 #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
447 # define PNG_MAX_MALLOC_64K
448 #endif
449
450 #ifndef PNG_UNUSED
451 /* Unused formal parameter warnings are silenced using the following macro
452 * which is expected to have no bad effects on performance (optimizing
453 * compilers will probably remove it entirely). Note that if you replace
454 * it with something other than whitespace, you must include the terminating
455 * semicolon.
456 */
457 # define PNG_UNUSED(param) (void)param;
458 #endif
459
460 /* Just a little check that someone hasn't tried to define something
461 * contradictory.
462 */
463 #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K)
464 # undef PNG_ZBUF_SIZE
465 # define PNG_ZBUF_SIZE 65536L
466 #endif
467
468 /* If warnings or errors are turned off the code is disabled or redirected here.
469 * From 1.5.4 functions have been added to allow very limited formatting of
470 * error and warning messages - this code will also be disabled here.
471 */
472 #ifdef PNG_WARNINGS_SUPPORTED
473 # define PNG_WARNING_PARAMETERS(p) png_warning_parameters p;
474 #else
475 # define png_warning_parameter(p,number,string) ((void)0)
476 # define png_warning_parameter_unsigned(p,number,format,value) ((void)0)
477 # define png_warning_parameter_signed(p,number,format,value) ((void)0)
478 # define png_formatted_warning(pp,p,message) ((void)(pp))
479 # define PNG_WARNING_PARAMETERS(p)
480 #endif
481 #ifndef PNG_ERROR_TEXT_SUPPORTED
482 # define png_fixed_error(s1,s2) png_err(s1)
483 #endif
484
485 /* Some fixed point APIs are still required even if not exported because
486 * they get used by the corresponding floating point APIs. This magic
487 * deals with this:
488 */
489 #ifdef PNG_FIXED_POINT_SUPPORTED
490 # define PNGFAPI PNGAPI
491 #else
492 # define PNGFAPI /* PRIVATE */
493 #endif
494
495 #ifndef PNG_VERSION_INFO_ONLY
496 /* Other defines specific to compilers can go here. Try to keep
497 * them inside an appropriate ifdef/endif pair for portability.
498 */
499
500 /* C allows up-casts from (void*) to any pointer and (const void*) to any
501 * pointer to a const object. C++ regards this as a type error and requires an
502 * explicit, static, cast and provides the static_cast<> rune to ensure that
503 * const is not cast away.
504 */
505 #ifdef __cplusplus
506 # define png_voidcast(type, value) static_cast<type>(value)
507 # define png_constcast(type, value) const_cast<type>(value)
508 # define png_aligncast(type, value) \
509 static_cast<type>(static_cast<void*>(value))
510 # define png_aligncastconst(type, value) \
511 static_cast<type>(static_cast<const void*>(value))
512 #else
513 # define png_voidcast(type, value) (value)
514 # ifdef _WIN64
515 # ifdef __GNUC__
516 typedef unsigned long long png_ptruint;
517 # else
518 typedef unsigned __int64 png_ptruint;
519 # endif
520 # else
521 typedef unsigned long png_ptruint;
522 # endif
523 # define png_constcast(type, value) ((type)(png_ptruint)(const void*)(value))
524 # define png_aligncast(type, value) ((void*)(value))
525 # define png_aligncastconst(type, value) ((const void*)(value))
526 #endif /* __cplusplus */
527
528 #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\
529 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
530 /* png.c requires the following ANSI-C constants if the conversion of
531 * floating point to ASCII is implemented therein:
532 *
533 * DBL_DIG Maximum number of decimal digits (can be set to any constant)
534 * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value)
535 * DBL_MAX Maximum floating point number (can be set to an arbitrary value)
536 */
537 # include <float.h>
538
539 # if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
540 defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
541 /* We need to check that <math.h> hasn't already been included earlier
542 * as it seems it doesn't agree with <fp.h>, yet we should really use
543 * <fp.h> if possible.
544 */
545 # if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
546 # include <fp.h>
547 # endif
548 # else
549 # include <math.h>
550 # endif
551 # if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
552 /* Amiga SAS/C: We must include builtin FPU functions when compiling using
553 * MATH=68881
554 */
555 # include <m68881.h>
556 # endif
557 #endif
558
559 /* This provides the non-ANSI (far) memory allocation routines. */
560 #if defined(__TURBOC__) && defined(__MSDOS__)
561 # include <mem.h>
562 # include <alloc.h>
563 #endif
564
565 #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \
566 defined(_WIN32) || defined(__WIN32__)
567 # include <windows.h> /* defines _WINDOWS_ macro */
568 #endif
569 #endif /* PNG_VERSION_INFO_ONLY */
570
571 /* Moved here around 1.5.0beta36 from pngconf.h */
572 /* Users may want to use these so they are not private. Any library
573 * functions that are passed far data must be model-independent.
574 */
575
576 /* Memory model/platform independent fns */
577 #ifndef PNG_ABORT
578 # ifdef _WINDOWS_
579 # define PNG_ABORT() ExitProcess(0)
580 # else
581 # define PNG_ABORT() abort()
582 # endif
583 #endif
584
585 /* These macros may need to be architecture dependent. */
586 #define PNG_ALIGN_NONE 0 /* do not use data alignment */
587 #define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */
588 #ifdef offsetof
589 # define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */
590 #else
591 # define PNG_ALIGN_OFFSET -1 /* prevent the use of this */
592 #endif
593 #define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */
594
595 #ifndef PNG_ALIGN_TYPE
596 /* Default to using aligned access optimizations and requiring alignment to a
597 * multiple of the data type size. Override in a compiler specific fashion
598 * if necessary by inserting tests here:
599 */
600 # define PNG_ALIGN_TYPE PNG_ALIGN_SIZE
601 #endif
602
603 #if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE
604 /* This is used because in some compiler implementations non-aligned
605 * structure members are supported, so the offsetof approach below fails.
606 * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access
607 * is good for performance. Do not do this unless you have tested the result
608 * and understand it.
609 */
610 # define png_alignof(type) (sizeof (type))
611 #else
612 # if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET
613 # define png_alignof(type) offsetof(struct{char c; type t;}, t)
614 # else
615 # if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS
616 # define png_alignof(type) (1)
617 # endif
618 /* Else leave png_alignof undefined to prevent use thereof */
619 # endif
620 #endif
621
622 /* This implicitly assumes alignment is always to a power of 2. */
623 #ifdef png_alignof
624 # define png_isaligned(ptr, type)\
625 (((type)((const char*)ptr-(const char*)0) & \
626 (type)(png_alignof(type)-1)) == 0)
627 #else
628 # define png_isaligned(ptr, type) 0
629 #endif
630
631 /* End of memory model/platform independent support */
632 /* End of 1.5.0beta36 move from pngconf.h */
633
634 /* CONSTANTS and UTILITY MACROS
635 * These are used internally by libpng and not exposed in the API
636 */
637
638 /* Various modes of operation. Note that after an init, mode is set to
639 * zero automatically when the structure is created. Three of these
640 * are defined in png.h because they need to be visible to applications
641 * that call png_set_unknown_chunk().
642 */
643 /* #define PNG_HAVE_IHDR 0x01U (defined in png.h) */
644 /* #define PNG_HAVE_PLTE 0x02U (defined in png.h) */
645 #define PNG_HAVE_IDAT 0x04U
646 /* #define PNG_AFTER_IDAT 0x08U (defined in png.h) */
647 #define PNG_HAVE_IEND 0x10U
648 /* 0x20U (unused) */
649 /* 0x40U (unused) */
650 /* 0x80U (unused) */
651 #define PNG_HAVE_CHUNK_HEADER 0x100U
652 #define PNG_WROTE_tIME 0x200U
653 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400U
654 #define PNG_BACKGROUND_IS_GRAY 0x800U
655 #define PNG_HAVE_PNG_SIGNATURE 0x1000U
656 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000U /* Have another chunk after IDAT */
657 /* 0x4000U (unused) */
658 #define PNG_IS_READ_STRUCT 0x8000U /* Else is a write struct */
659
660 /* Flags for the transformations the PNG library does on the image data */
661 #define PNG_BGR 0x0001U
662 #define PNG_INTERLACE 0x0002U
663 #define PNG_PACK 0x0004U
664 #define PNG_SHIFT 0x0008U
665 #define PNG_SWAP_BYTES 0x0010U
666 #define PNG_INVERT_MONO 0x0020U
667 #define PNG_QUANTIZE 0x0040U
668 #define PNG_COMPOSE 0x0080U /* Was PNG_BACKGROUND */
669 #define PNG_BACKGROUND_EXPAND 0x0100U
670 #define PNG_EXPAND_16 0x0200U /* Added to libpng 1.5.2 */
671 #define PNG_16_TO_8 0x0400U /* Becomes 'chop' in 1.5.4 */
672 #define PNG_RGBA 0x0800U
673 #define PNG_EXPAND 0x1000U
674 #define PNG_GAMMA 0x2000U
675 #define PNG_GRAY_TO_RGB 0x4000U
676 #define PNG_FILLER 0x8000U
677 #define PNG_PACKSWAP 0x10000U
678 #define PNG_SWAP_ALPHA 0x20000U
679 #define PNG_STRIP_ALPHA 0x40000U
680 #define PNG_INVERT_ALPHA 0x80000U
681 #define PNG_USER_TRANSFORM 0x100000U
682 #define PNG_RGB_TO_GRAY_ERR 0x200000U
683 #define PNG_RGB_TO_GRAY_WARN 0x400000U
684 #define PNG_RGB_TO_GRAY 0x600000U /* two bits, RGB_TO_GRAY_ERR|WARN */
685 #define PNG_ENCODE_ALPHA 0x800000U /* Added to libpng-1.5.4 */
686 #define PNG_ADD_ALPHA 0x1000000U /* Added to libpng-1.2.7 */
687 #define PNG_EXPAND_tRNS 0x2000000U /* Added to libpng-1.2.9 */
688 #define PNG_SCALE_16_TO_8 0x4000000U /* Added to libpng-1.5.4 */
689 /* 0x8000000U unused */
690 /* 0x10000000U unused */
691 /* 0x20000000U unused */
692 /* 0x40000000U unused */
693 /* Flags for png_create_struct */
694 #define PNG_STRUCT_PNG 0x0001U
695 #define PNG_STRUCT_INFO 0x0002U
696
697 /* Flags for the png_ptr->flags rather than declaring a byte for each one */
698 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001U
699 #define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002U /* Added to libpng-1.6.0 */
700 /* 0x0004U unused */
701 #define PNG_FLAG_ZSTREAM_ENDED 0x0008U /* Added to libpng-1.6.0 */
702 /* 0x0010U unused */
703 /* 0x0020U unused */
704 #define PNG_FLAG_ROW_INIT 0x0040U
705 #define PNG_FLAG_FILLER_AFTER 0x0080U
706 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100U
707 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200U
708 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400U
709 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800U
710 #define PNG_FLAG_ASSUME_sRGB 0x1000U /* Added to libpng-1.5.4 */
711 #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000U /* Added to libpng-1.5.4 */
712 #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000U /* Added to libpng-1.5.4 */
713 /* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000U */
714 /* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000U */
715 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000U
716 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000U
717 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000U
718 #define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000U /* Added to libpng-1.4.0 */
719 #define PNG_FLAG_APP_WARNINGS_WARN 0x200000U /* Added to libpng-1.6.0 */
720 #define PNG_FLAG_APP_ERRORS_WARN 0x400000U /* Added to libpng-1.6.0 */
721 /* 0x800000U unused */
722 /* 0x1000000U unused */
723 /* 0x2000000U unused */
724 /* 0x4000000U unused */
725 /* 0x8000000U unused */
726 /* 0x10000000U unused */
727 /* 0x20000000U unused */
728 /* 0x40000000U unused */
729
730 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
731 PNG_FLAG_CRC_ANCILLARY_NOWARN)
732
733 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
734 PNG_FLAG_CRC_CRITICAL_IGNORE)
735
736 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
737 PNG_FLAG_CRC_CRITICAL_MASK)
738
739 /* Save typing and make code easier to understand */
740
741 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
742 abs((int)((c1).green) - (int)((c2).green)) + \
743 abs((int)((c1).blue) - (int)((c2).blue)))
744
745 /* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255
746 * by dividing by 257 *with rounding*. This macro is exact for the given range.
747 * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the
748 * macro were established by experiment (modifying the added value). The macro
749 * has a second variant that takes a value already scaled by 255 and divides by
750 * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it
751 * only gives off-by-one errors and only for 0.5% (1 in 200) of the values.
752 */
753 #define PNG_DIV65535(v24) (((v24) + 32895) >> 16)
754 #define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255)
755
756 /* Added to libpng-1.2.6 JB */
757 #define PNG_ROWBYTES(pixel_bits, width) \
758 ((pixel_bits) >= 8 ? \
759 ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \
760 (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) )
761
762 /* This returns the number of trailing bits in the last byte of a row, 0 if the
763 * last byte is completely full of pixels. It is, in principle, (pixel_bits x
764 * width) % 8, but that would overflow for large 'width'. The second macro is
765 * the same except that it returns the number of unused bits in the last byte;
766 * (8-TRAILBITS), but 0 when TRAILBITS is 0.
767 *
768 * NOTE: these macros are intended to be self-evidently correct and never
769 * overflow on the assumption that pixel_bits is in the range 0..255. The
770 * arguments are evaluated only once and they can be signed (e.g. as a result of
771 * the integral promotions). The result of the expression always has type
772 * (png_uint_32), however the compiler always knows it is in the range 0..7.
773 */
774 #define PNG_TRAILBITS(pixel_bits, width) \
775 (((pixel_bits) * ((width) % (png_uint_32)8)) % 8)
776
777 #define PNG_PADBITS(pixel_bits, width) \
778 ((8 - PNG_TRAILBITS(pixel_bits, width)) % 8)
779
780 /* PNG_OUT_OF_RANGE returns true if value is outside the range
781 * ideal-delta..ideal+delta. Each argument is evaluated twice.
782 * "ideal" and "delta" should be constants, normally simple
783 * integers, "value" a variable. Added to libpng-1.2.6 JB
784 */
785 #define PNG_OUT_OF_RANGE(value, ideal, delta) \
786 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
787
788 /* Conversions between fixed and floating point, only defined if
789 * required (to make sure the code doesn't accidentally use float
790 * when it is supposedly disabled.)
791 */
792 #ifdef PNG_FLOATING_POINT_SUPPORTED
793 /* The floating point conversion can't overflow, though it can and
794 * does lose accuracy relative to the original fixed point value.
795 * In practice this doesn't matter because png_fixed_point only
796 * stores numbers with very low precision. The png_ptr and s
797 * arguments are unused by default but are there in case error
798 * checking becomes a requirement.
799 */
800 #define png_float(png_ptr, fixed, s) (.00001 * (fixed))
801
802 /* The fixed point conversion performs range checking and evaluates
803 * its argument multiple times, so must be used with care. The
804 * range checking uses the PNG specification values for a signed
805 * 32-bit fixed point value except that the values are deliberately
806 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly
807 * (2^31-1) * 100000). 's' is a string that describes the value being
808 * converted.
809 *
810 * NOTE: this macro will raise a png_error if the range check fails,
811 * therefore it is normally only appropriate to use this on values
812 * that come from API calls or other sources where an out of range
813 * error indicates a programming error, not a data error!
814 *
815 * NOTE: by default this is off - the macro is not used - because the
816 * function call saves a lot of code.
817 */
818 #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED
819 #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\
820 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0))
821 #endif
822 /* else the corresponding function is defined below, inside the scope of the
823 * cplusplus test.
824 */
825 #endif
826
827 /* Constants for known chunk types. If you need to add a chunk, define the name
828 * here. For historical reasons these constants have the form png_<name>; i.e.
829 * the prefix is lower case. Please use decimal values as the parameters to
830 * match the ISO PNG specification and to avoid relying on the C locale
831 * interpretation of character values.
832 *
833 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values
834 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string
835 * to be generated if required.
836 *
837 * PNG_32b correctly produces a value shifted by up to 24 bits, even on
838 * architectures where (int) is only 16 bits.
839 */
840 #define PNG_32b(b,s) ((png_uint_32)(b) << (s))
841 #define PNG_U32(b1,b2,b3,b4) \
842 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0))
843
844 /* Constants for known chunk types.
845 *
846 * MAINTAINERS: If you need to add a chunk, define the name here.
847 * For historical reasons these constants have the form png_<name>; i.e.
848 * the prefix is lower case. Please use decimal values as the parameters to
849 * match the ISO PNG specification and to avoid relying on the C locale
850 * interpretation of character values. Please keep the list sorted.
851 *
852 * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk
853 * type. In fact the specification does not express chunk types this way,
854 * however using a 32-bit value means that the chunk type can be read from the
855 * stream using exactly the same code as used for a 32-bit unsigned value and
856 * can be examined far more efficiently (using one arithmetic compare).
857 *
858 * Prior to 1.5.6 the chunk type constants were expressed as C strings. The
859 * libpng API still uses strings for 'unknown' chunks and a macro,
860 * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice
861 * that for portable code numeric values must still be used; the string "IHDR"
862 * is not portable and neither is PNG_U32('I', 'H', 'D', 'R').
863 *
864 * In 1.7.0 the definitions will be made public in png.h to avoid having to
865 * duplicate the same definitions in application code.
866 */
867 #define png_IDAT PNG_U32( 73, 68, 65, 84)
868 #define png_IEND PNG_U32( 73, 69, 78, 68)
869 #define png_IHDR PNG_U32( 73, 72, 68, 82)
870 #define png_PLTE PNG_U32( 80, 76, 84, 69)
871 #define png_bKGD PNG_U32( 98, 75, 71, 68)
872 #define png_cHRM PNG_U32( 99, 72, 82, 77)
873 #define png_eXIf PNG_U32(101, 88, 73, 102) /* registered July 2017 */
874 #define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */
875 #define png_gAMA PNG_U32(103, 65, 77, 65)
876 #define png_gIFg PNG_U32(103, 73, 70, 103)
877 #define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */
878 #define png_gIFx PNG_U32(103, 73, 70, 120)
879 #define png_hIST PNG_U32(104, 73, 83, 84)
880 #define png_iCCP PNG_U32(105, 67, 67, 80)
881 #define png_iTXt PNG_U32(105, 84, 88, 116)
882 #define png_oFFs PNG_U32(111, 70, 70, 115)
883 #define png_pCAL PNG_U32(112, 67, 65, 76)
884 #define png_pHYs PNG_U32(112, 72, 89, 115)
885 #define png_sBIT PNG_U32(115, 66, 73, 84)
886 #define png_sCAL PNG_U32(115, 67, 65, 76)
887 #define png_sPLT PNG_U32(115, 80, 76, 84)
888 #define png_sRGB PNG_U32(115, 82, 71, 66)
889 #define png_sTER PNG_U32(115, 84, 69, 82)
890 #define png_tEXt PNG_U32(116, 69, 88, 116)
891 #define png_tIME PNG_U32(116, 73, 77, 69)
892 #define png_tRNS PNG_U32(116, 82, 78, 83)
893 #define png_zTXt PNG_U32(122, 84, 88, 116)
894
895 /* The following will work on (signed char*) strings, whereas the get_uint_32
896 * macro will fail on top-bit-set values because of the sign extension.
897 */
898 #define PNG_CHUNK_FROM_STRING(s)\
899 PNG_U32(0xff & (s)[0], 0xff & (s)[1], 0xff & (s)[2], 0xff & (s)[3])
900
901 /* This uses (char), not (png_byte) to avoid warnings on systems where (char) is
902 * signed and the argument is a (char[]) This macro will fail miserably on
903 * systems where (char) is more than 8 bits.
904 */
905 #define PNG_STRING_FROM_CHUNK(s,c)\
906 (void)(((char*)(s))[0]=(char)(((c)>>24) & 0xff), \
907 ((char*)(s))[1]=(char)(((c)>>16) & 0xff),\
908 ((char*)(s))[2]=(char)(((c)>>8) & 0xff), \
909 ((char*)(s))[3]=(char)((c & 0xff)))
910
911 /* Do the same but terminate with a null character. */
912 #define PNG_CSTRING_FROM_CHUNK(s,c)\
913 (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0)
914
915 /* Test on flag values as defined in the spec (section 5.4): */
916 #define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29))
917 #define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c))
918 #define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21))
919 #define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13))
920 #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5))
921
922 /* Gamma values (new at libpng-1.5.4): */
923 #define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */
924 #define PNG_GAMMA_MAC_INVERSE 65909
925 #define PNG_GAMMA_sRGB_INVERSE 45455
926
927 /* Almost everything below is C specific; the #defines above can be used in
928 * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot.
929 */
930 #ifndef PNG_VERSION_INFO_ONLY
931
932 #include "pngstruct.h"
933 #include "pnginfo.h"
934
935 /* Validate the include paths - the include path used to generate pnglibconf.h
936 * must match that used in the build, or we must be using pnglibconf.h.prebuilt:
937 */
938 #if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM
939 # error ZLIB_VERNUM != PNG_ZLIB_VERNUM \
940 "-I (include path) error: see the notes in pngpriv.h"
941 /* This means that when pnglibconf.h was built the copy of zlib.h that it
942 * used is not the same as the one being used here. Because the build of
943 * libpng makes decisions to use inflateInit2 and inflateReset2 based on the
944 * zlib version number and because this affects handling of certain broken
945 * PNG files the -I directives must match.
946 *
947 * The most likely explanation is that you passed a -I in CFLAGS. This will
948 * not work; all the preprocessor directories and in particular all the -I
949 * directives must be in CPPFLAGS.
950 */
951 #endif
952
953 /* This is used for 16-bit gamma tables -- only the top level pointers are
954 * const; this could be changed:
955 */
956 typedef const png_uint_16p * png_const_uint_16pp;
957
958 /* Added to libpng-1.5.7: sRGB conversion tables */
959 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
960 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
961 #ifdef PNG_SIMPLIFIED_READ_SUPPORTED
962 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]);
963 /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value,
964 * 0..65535. This table gives the closest 16-bit answers (no errors).
965 */
966 #endif
967
968 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]);
969 PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]);
970
971 #define PNG_sRGB_FROM_LINEAR(linear) \
972 ((png_byte)(0xff & ((png_sRGB_base[(linear)>>15] \
973 + ((((linear) & 0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8)))
974 /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB
975 * encoded value with maximum error 0.646365. Note that the input is not a
976 * 16-bit value; it has been multiplied by 255! */
977 #endif /* SIMPLIFIED_READ/WRITE */
978
979
980 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */
981 #ifdef __cplusplus
982 extern "C" {
983 #endif /* __cplusplus */
984
985 /* Internal functions; these are not exported from a DLL however because they
986 * are used within several of the C source files they have to be C extern.
987 *
988 * All of these functions must be declared with PNG_INTERNAL_FUNCTION.
989 */
990
991 /* Zlib support */
992 #define PNG_UNEXPECTED_ZLIB_RETURN (-7)
993 PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret),
994 PNG_EMPTY);
995 /* Used by the zlib handling functions to ensure that z_stream::msg is always
996 * set before they return.
997 */
998
999 #ifdef PNG_WRITE_SUPPORTED
1000 PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr,
1001 png_compression_bufferp *list),PNG_EMPTY);
1002 /* Free the buffer list used by the compressed write code. */
1003 #endif
1004
1005 #if defined(PNG_FLOATING_POINT_SUPPORTED) && \
1006 !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \
1007 (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \
1008 defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \
1009 defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \
1010 (defined(PNG_sCAL_SUPPORTED) && \
1011 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED))
1012 PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr,
1013 double fp, png_const_charp text),PNG_EMPTY);
1014 #endif
1015
1016 /* Check the user version string for compatibility, returns false if the version
1017 * numbers aren't compatible.
1018 */
1019 PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr,
1020 png_const_charp user_png_ver),PNG_EMPTY);
1021
1022 /* Internal base allocator - no messages, NULL on failure to allocate. This
1023 * does, however, call the application provided allocator and that could call
1024 * png_error (although that would be a bug in the application implementation.)
1025 */
1026 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr,
1027 png_alloc_size_t size),PNG_ALLOCATED);
1028
1029 #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\
1030 defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED)
1031 /* Internal array allocator, outputs no error or warning messages on failure,
1032 * just returns NULL.
1033 */
1034 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr,
1035 int nelements, size_t element_size),PNG_ALLOCATED);
1036
1037 /* The same but an existing array is extended by add_elements. This function
1038 * also memsets the new elements to 0 and copies the old elements. The old
1039 * array is not freed or altered.
1040 */
1041 PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr,
1042 png_const_voidp array, int old_elements, int add_elements,
1043 size_t element_size),PNG_ALLOCATED);
1044 #endif /* text, sPLT or unknown chunks */
1045
1046 /* Magic to create a struct when there is no struct to call the user supplied
1047 * memory allocators. Because error handling has not been set up the memory
1048 * handlers can't safely call png_error, but this is an obscure and undocumented
1049 * restriction so libpng has to assume that the 'free' handler, at least, might
1050 * call png_error.
1051 */
1052 PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct,
1053 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
1054 png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn,
1055 png_free_ptr free_fn),PNG_ALLOCATED);
1056
1057 /* Free memory from internal libpng struct */
1058 PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr),
1059 PNG_EMPTY);
1060
1061 /* Free an allocated jmp_buf (always succeeds) */
1062 PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY);
1063
1064 /* Function to allocate memory for zlib. PNGAPI is disallowed. */
1065 PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size),
1066 PNG_ALLOCATED);
1067
1068 /* Function to free memory for zlib. PNGAPI is disallowed. */
1069 PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY);
1070
1071 /* Next four functions are used internally as callbacks. PNGCBAPI is required
1072 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to
1073 * PNGCBAPI at 1.5.0
1074 */
1075
1076 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr,
1077 png_bytep data, png_size_t length),PNG_EMPTY);
1078
1079 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1080 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr,
1081 png_bytep buffer, png_size_t length),PNG_EMPTY);
1082 #endif
1083
1084 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr,
1085 png_bytep data, png_size_t length),PNG_EMPTY);
1086
1087 #ifdef PNG_WRITE_FLUSH_SUPPORTED
1088 # ifdef PNG_STDIO_SUPPORTED
1089 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr),
1090 PNG_EMPTY);
1091 # endif
1092 #endif
1093
1094 /* Reset the CRC variable */
1095 PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY);
1096
1097 /* Write the "data" buffer to whatever output you are using */
1098 PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr,
1099 png_const_bytep data, png_size_t length),PNG_EMPTY);
1100
1101 /* Read and check the PNG file signature */
1102 PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr,
1103 png_inforp info_ptr),PNG_EMPTY);
1104
1105 /* Read the chunk header (length + type name) */
1106 PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr),
1107 PNG_EMPTY);
1108
1109 /* Read data from whatever input you are using into the "data" buffer */
1110 PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data,
1111 png_size_t length),PNG_EMPTY);
1112
1113 /* Read bytes into buf, and update png_ptr->crc */
1114 PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf,
1115 png_uint_32 length),PNG_EMPTY);
1116
1117 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
1118 PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr,
1119 png_uint_32 skip),PNG_EMPTY);
1120
1121 /* Read the CRC from the file and compare it to the libpng calculated CRC */
1122 PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY);
1123
1124 /* Calculate the CRC over a section of data. Note that we are only
1125 * passing a maximum of 64K on systems that have this as a memory limit,
1126 * since this is the maximum buffer size we can specify.
1127 */
1128 PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr,
1129 png_const_bytep ptr, png_size_t length),PNG_EMPTY);
1130
1131 #ifdef PNG_WRITE_FLUSH_SUPPORTED
1132 PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY);
1133 #endif
1134
1135 /* Write various chunks */
1136
1137 /* Write the IHDR chunk, and update the png_struct with the necessary
1138 * information.
1139 */
1140 PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr,
1141 png_uint_32 width, png_uint_32 height, int bit_depth, int color_type,
1142 int compression_method, int filter_method, int interlace_method),PNG_EMPTY);
1143
1144 PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr,
1145 png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY);
1146
1147 PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr,
1148 png_const_bytep row_data, png_alloc_size_t row_data_length, int flush),
1149 PNG_EMPTY);
1150
1151 PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY);
1152
1153 #ifdef PNG_WRITE_gAMA_SUPPORTED
1154 PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr,
1155 png_fixed_point file_gamma),PNG_EMPTY);
1156 #endif
1157
1158 #ifdef PNG_WRITE_sBIT_SUPPORTED
1159 PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr,
1160 png_const_color_8p sbit, int color_type),PNG_EMPTY);
1161 #endif
1162
1163 #ifdef PNG_WRITE_cHRM_SUPPORTED
1164 PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr,
1165 const png_xy *xy), PNG_EMPTY);
1166 /* The xy value must have been previously validated */
1167 #endif
1168
1169 #ifdef PNG_WRITE_sRGB_SUPPORTED
1170 PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr,
1171 int intent),PNG_EMPTY);
1172 #endif
1173
1174 #ifdef PNG_WRITE_eXIf_SUPPORTED
1175 PNG_INTERNAL_FUNCTION(void,png_write_eXIf,(png_structrp png_ptr,
1176 png_bytep exif, int num_exif),PNG_EMPTY);
1177 #endif
1178
1179 #ifdef PNG_WRITE_iCCP_SUPPORTED
1180 PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr,
1181 png_const_charp name, png_const_bytep profile), PNG_EMPTY);
1182 /* The profile must have been previously validated for correctness, the
1183 * length comes from the first four bytes. Only the base, deflate,
1184 * compression is supported.
1185 */
1186 #endif
1187
1188 #ifdef PNG_WRITE_sPLT_SUPPORTED
1189 PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr,
1190 png_const_sPLT_tp palette),PNG_EMPTY);
1191 #endif
1192
1193 #ifdef PNG_WRITE_tRNS_SUPPORTED
1194 PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr,
1195 png_const_bytep trans, png_const_color_16p values, int number,
1196 int color_type),PNG_EMPTY);
1197 #endif
1198
1199 #ifdef PNG_WRITE_bKGD_SUPPORTED
1200 PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr,
1201 png_const_color_16p values, int color_type),PNG_EMPTY);
1202 #endif
1203
1204 #ifdef PNG_WRITE_hIST_SUPPORTED
1205 PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr,
1206 png_const_uint_16p hist, int num_hist),PNG_EMPTY);
1207 #endif
1208
1209 /* Chunks that have keywords */
1210 #ifdef PNG_WRITE_tEXt_SUPPORTED
1211 PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr,
1212 png_const_charp key, png_const_charp text, png_size_t text_len),PNG_EMPTY);
1213 #endif
1214
1215 #ifdef PNG_WRITE_zTXt_SUPPORTED
1216 PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp
1217 key, png_const_charp text, int compression),PNG_EMPTY);
1218 #endif
1219
1220 #ifdef PNG_WRITE_iTXt_SUPPORTED
1221 PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr,
1222 int compression, png_const_charp key, png_const_charp lang,
1223 png_const_charp lang_key, png_const_charp text),PNG_EMPTY);
1224 #endif
1225
1226 #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */
1227 PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr,
1228 png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY);
1229 #endif
1230
1231 #ifdef PNG_WRITE_oFFs_SUPPORTED
1232 PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr,
1233 png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY);
1234 #endif
1235
1236 #ifdef PNG_WRITE_pCAL_SUPPORTED
1237 PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr,
1238 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
1239 png_const_charp units, png_charpp params),PNG_EMPTY);
1240 #endif
1241
1242 #ifdef PNG_WRITE_pHYs_SUPPORTED
1243 PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr,
1244 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
1245 int unit_type),PNG_EMPTY);
1246 #endif
1247
1248 #ifdef PNG_WRITE_tIME_SUPPORTED
1249 PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr,
1250 png_const_timep mod_time),PNG_EMPTY);
1251 #endif
1252
1253 #ifdef PNG_WRITE_sCAL_SUPPORTED
1254 PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr,
1255 int unit, png_const_charp width, png_const_charp height),PNG_EMPTY);
1256 #endif
1257
1258 /* Called when finished processing a row of data */
1259 PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr),
1260 PNG_EMPTY);
1261
1262 /* Internal use only. Called before first row of data */
1263 PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr),
1264 PNG_EMPTY);
1265
1266 /* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an
1267 * array of png_ptr->width pixels. If the image is not interlaced or this
1268 * is the final pass this just does a memcpy, otherwise the "display" flag
1269 * is used to determine whether to copy pixels that are not in the current pass.
1270 *
1271 * Because 'png_do_read_interlace' (below) replicates pixels this allows this
1272 * function to achieve the documented 'blocky' appearance during interlaced read
1273 * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row'
1274 * are not changed if they are not in the current pass, when display is 0.
1275 *
1276 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless.
1277 *
1278 * The API always reads from the png_struct row buffer and always assumes that
1279 * it is full width (png_do_read_interlace has already been called.)
1280 *
1281 * This function is only ever used to write to row buffers provided by the
1282 * caller of the relevant libpng API and the row must have already been
1283 * transformed by the read transformations.
1284 *
1285 * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed
1286 * bitmasks for use within the code, otherwise runtime generated masks are used.
1287 * The default is compile time masks.
1288 */
1289 #ifndef PNG_USE_COMPILE_TIME_MASKS
1290 # define PNG_USE_COMPILE_TIME_MASKS 1
1291 #endif
1292 PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr,
1293 png_bytep row, int display),PNG_EMPTY);
1294
1295 #ifdef PNG_READ_INTERLACING_SUPPORTED
1296 /* Expand an interlaced row: the 'row_info' describes the pass data that has
1297 * been read in and must correspond to the pixels in 'row', the pixels are
1298 * expanded (moved apart) in 'row' to match the final layout, when doing this
1299 * the pixels are *replicated* to the intervening space. This is essential for
1300 * the correct operation of png_combine_row, above.
1301 */
1302 PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info,
1303 png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY);
1304 #endif
1305
1306 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
1307
1308 #ifdef PNG_WRITE_INTERLACING_SUPPORTED
1309 /* Grab pixels out of a row for an interlaced pass */
1310 PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info,
1311 png_bytep row, int pass),PNG_EMPTY);
1312 #endif
1313
1314 /* Unfilter a row: check the filter value before calling this, there is no point
1315 * calling it for PNG_FILTER_VALUE_NONE.
1316 */
1317 PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop
1318 row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY);
1319
1320 #if PNG_ARM_NEON_OPT > 0
1321 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info,
1322 png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1323 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop
1324 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1325 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop
1326 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1327 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop
1328 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1329 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop
1330 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1331 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_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_paeth4_neon,(png_row_infop
1334 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1335 #endif
1336
1337 #if PNG_MIPS_MSA_OPT > 0
1338 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_msa,(png_row_infop row_info,
1339 png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1340 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_msa,(png_row_infop
1341 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1342 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_msa,(png_row_infop
1343 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1344 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_msa,(png_row_infop
1345 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1346 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_msa,(png_row_infop
1347 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1348 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_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_paeth4_msa,(png_row_infop
1351 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1352 #endif
1353
1354 #if PNG_POWERPC_VSX_OPT > 0
1355 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_vsx,(png_row_infop row_info,
1356 png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1357 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_vsx,(png_row_infop
1358 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1359 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_vsx,(png_row_infop
1360 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1361 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_vsx,(png_row_infop
1362 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1363 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_vsx,(png_row_infop
1364 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1365 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_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_paeth4_vsx,(png_row_infop
1368 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1369 #endif
1370
1371 #if PNG_INTEL_SSE_IMPLEMENTATION > 0
1372 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_sse2,(png_row_infop
1373 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1374 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_sse2,(png_row_infop
1375 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1376 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_sse2,(png_row_infop
1377 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1378 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_sse2,(png_row_infop
1379 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1380 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_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_paeth4_sse2,(png_row_infop
1383 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1384 #endif
1385
1386 /* Choose the best filter to use and filter the row data */
1387 PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr,
1388 png_row_infop row_info),PNG_EMPTY);
1389
1390 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1391 PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr,
1392 png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY);
1393 /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer
1394 * is NULL the function checks, instead, for the end of the stream. In this
1395 * case a benign error will be issued if the stream end is not found or if
1396 * extra data has to be consumed.
1397 */
1398 PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr),
1399 PNG_EMPTY);
1400 /* This cleans up when the IDAT LZ stream does not end when the last image
1401 * byte is read; there is still some pending input.
1402 */
1403
1404 PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr),
1405 PNG_EMPTY);
1406 /* Finish a row while reading, dealing with interlacing passes, etc. */
1407 #endif /* SEQUENTIAL_READ */
1408
1409 /* Initialize the row buffers, etc. */
1410 PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY);
1411
1412 #if ZLIB_VERNUM >= 0x1240
1413 PNG_INTERNAL_FUNCTION(int,png_zlib_inflate,(png_structrp png_ptr, int flush),
1414 PNG_EMPTY);
1415 # define PNG_INFLATE(pp, flush) png_zlib_inflate(pp, flush)
1416 #else /* Zlib < 1.2.4 */
1417 # define PNG_INFLATE(pp, flush) inflate(&(pp)->zstream, flush)
1418 #endif /* Zlib < 1.2.4 */
1419
1420 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
1421 /* Optional call to update the users info structure */
1422 PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr,
1423 png_inforp info_ptr),PNG_EMPTY);
1424 #endif
1425
1426 /* Shared transform functions, defined in pngtran.c */
1427 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
1428 defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
1429 PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info,
1430 png_bytep row, int at_start),PNG_EMPTY);
1431 #endif
1432
1433 #ifdef PNG_16BIT_SUPPORTED
1434 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
1435 PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info,
1436 png_bytep row),PNG_EMPTY);
1437 #endif
1438 #endif
1439
1440 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
1441 defined(PNG_WRITE_PACKSWAP_SUPPORTED)
1442 PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info,
1443 png_bytep row),PNG_EMPTY);
1444 #endif
1445
1446 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
1447 PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info,
1448 png_bytep row),PNG_EMPTY);
1449 #endif
1450
1451 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
1452 PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info,
1453 png_bytep row),PNG_EMPTY);
1454 #endif
1455
1456 /* The following decodes the appropriate chunks, and does error correction,
1457 * then calls the appropriate callback for the chunk if it is valid.
1458 */
1459
1460 /* Decode the IHDR chunk */
1461 PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr,
1462 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1463 PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr,
1464 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1465 PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr,
1466 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1467
1468 #ifdef PNG_READ_bKGD_SUPPORTED
1469 PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr,
1470 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1471 #endif
1472
1473 #ifdef PNG_READ_cHRM_SUPPORTED
1474 PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr,
1475 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1476 #endif
1477
1478 #ifdef PNG_READ_eXIf_SUPPORTED
1479 PNG_INTERNAL_FUNCTION(void,png_handle_eXIf,(png_structrp png_ptr,
1480 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1481 #endif
1482
1483 #ifdef PNG_READ_gAMA_SUPPORTED
1484 PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr,
1485 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1486 #endif
1487
1488 #ifdef PNG_READ_hIST_SUPPORTED
1489 PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr,
1490 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1491 #endif
1492
1493 #ifdef PNG_READ_iCCP_SUPPORTED
1494 PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr,
1495 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1496 #endif /* READ_iCCP */
1497
1498 #ifdef PNG_READ_iTXt_SUPPORTED
1499 PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr,
1500 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1501 #endif
1502
1503 #ifdef PNG_READ_oFFs_SUPPORTED
1504 PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr,
1505 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1506 #endif
1507
1508 #ifdef PNG_READ_pCAL_SUPPORTED
1509 PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr,
1510 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1511 #endif
1512
1513 #ifdef PNG_READ_pHYs_SUPPORTED
1514 PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr,
1515 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1516 #endif
1517
1518 #ifdef PNG_READ_sBIT_SUPPORTED
1519 PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr,
1520 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1521 #endif
1522
1523 #ifdef PNG_READ_sCAL_SUPPORTED
1524 PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr,
1525 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1526 #endif
1527
1528 #ifdef PNG_READ_sPLT_SUPPORTED
1529 PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr,
1530 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1531 #endif /* READ_sPLT */
1532
1533 #ifdef PNG_READ_sRGB_SUPPORTED
1534 PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr,
1535 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1536 #endif
1537
1538 #ifdef PNG_READ_tEXt_SUPPORTED
1539 PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr,
1540 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1541 #endif
1542
1543 #ifdef PNG_READ_tIME_SUPPORTED
1544 PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr,
1545 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1546 #endif
1547
1548 #ifdef PNG_READ_tRNS_SUPPORTED
1549 PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr,
1550 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1551 #endif
1552
1553 #ifdef PNG_READ_zTXt_SUPPORTED
1554 PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr,
1555 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1556 #endif
1557
1558 PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_const_structrp png_ptr,
1559 const png_uint_32 chunk_name),PNG_EMPTY);
1560
1561 PNG_INTERNAL_FUNCTION(void,png_check_chunk_length,(png_const_structrp png_ptr,
1562 const png_uint_32 chunk_length),PNG_EMPTY);
1563
1564 PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr,
1565 png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY);
1566 /* This is the function that gets called for unknown chunks. The 'keep'
1567 * argument is either non-zero for a known chunk that has been set to be
1568 * handled as unknown or zero for an unknown chunk. By default the function
1569 * just skips the chunk or errors out if it is critical.
1570 */
1571
1572 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\
1573 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
1574 PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling,
1575 (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY);
1576 /* Exactly as the API png_handle_as_unknown() except that the argument is a
1577 * 32-bit chunk name, not a string.
1578 */
1579 #endif /* READ_UNKNOWN_CHUNKS || HANDLE_AS_UNKNOWN */
1580
1581 /* Handle the transformations for reading and writing */
1582 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
1583 PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr,
1584 png_row_infop row_info),PNG_EMPTY);
1585 #endif
1586 #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
1587 PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr,
1588 png_row_infop row_info),PNG_EMPTY);
1589 #endif
1590
1591 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
1592 PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr),
1593 PNG_EMPTY);
1594 #endif
1595
1596 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1597 PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr,
1598 png_inforp info_ptr),PNG_EMPTY);
1599 PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr,
1600 png_inforp info_ptr),PNG_EMPTY);
1601 PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY);
1602 PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr),
1603 PNG_EMPTY);
1604 PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr,
1605 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY);
1606 PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY);
1607 PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr,
1608 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY);
1609 PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr),
1610 PNG_EMPTY);
1611 PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr,
1612 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1613 PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr,
1614 png_inforp info_ptr),PNG_EMPTY);
1615 PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr,
1616 png_inforp info_ptr),PNG_EMPTY);
1617 PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr,
1618 png_bytep row),PNG_EMPTY);
1619 PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr,
1620 png_inforp info_ptr),PNG_EMPTY);
1621 PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr,
1622 png_inforp info_ptr),PNG_EMPTY);
1623 PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr),
1624 PNG_EMPTY);
1625 # ifdef PNG_READ_tEXt_SUPPORTED
1626 PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr,
1627 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1628 PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr,
1629 png_inforp info_ptr),PNG_EMPTY);
1630 # endif
1631 # ifdef PNG_READ_zTXt_SUPPORTED
1632 PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr,
1633 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1634 PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr,
1635 png_inforp info_ptr),PNG_EMPTY);
1636 # endif
1637 # ifdef PNG_READ_iTXt_SUPPORTED
1638 PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr,
1639 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1640 PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr,
1641 png_inforp info_ptr),PNG_EMPTY);
1642 # endif
1643
1644 #endif /* PROGRESSIVE_READ */
1645
1646 /* Added at libpng version 1.6.0 */
1647 #ifdef PNG_GAMMA_SUPPORTED
1648 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr,
1649 png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY);
1650 /* Set the colorspace gamma with a value provided by the application or by
1651 * the gAMA chunk on read. The value will override anything set by an ICC
1652 * profile.
1653 */
1654
1655 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr,
1656 png_inforp info_ptr), PNG_EMPTY);
1657 /* Synchronize the info 'valid' flags with the colorspace */
1658
1659 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr,
1660 png_inforp info_ptr), PNG_EMPTY);
1661 /* Copy the png_struct colorspace to the info_struct and call the above to
1662 * synchronize the flags. Checks for NULL info_ptr and does nothing.
1663 */
1664 #endif
1665
1666 /* Added at libpng version 1.4.0 */
1667 #ifdef PNG_COLORSPACE_SUPPORTED
1668 /* These internal functions are for maintaining the colorspace structure within
1669 * a png_info or png_struct (or, indeed, both).
1670 */
1671 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities,
1672 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy,
1673 int preferred), PNG_EMPTY);
1674
1675 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints,
1676 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ,
1677 int preferred), PNG_EMPTY);
1678
1679 #ifdef PNG_sRGB_SUPPORTED
1680 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr,
1681 png_colorspacerp colorspace, int intent), PNG_EMPTY);
1682 /* This does set the colorspace gAMA and cHRM values too, but doesn't set the
1683 * flags to write them, if it returns false there was a problem and an error
1684 * message has already been output (but the colorspace may still need to be
1685 * synced to record the invalid flag).
1686 */
1687 #endif /* sRGB */
1688
1689 #ifdef PNG_iCCP_SUPPORTED
1690 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr,
1691 png_colorspacerp colorspace, png_const_charp name,
1692 png_uint_32 profile_length, png_const_bytep profile, int color_type),
1693 PNG_EMPTY);
1694 /* The 'name' is used for information only */
1695
1696 /* Routines for checking parts of an ICC profile. */
1697 #ifdef PNG_READ_iCCP_SUPPORTED
1698 PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr,
1699 png_colorspacerp colorspace, png_const_charp name,
1700 png_uint_32 profile_length), PNG_EMPTY);
1701 #endif /* READ_iCCP */
1702 PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr,
1703 png_colorspacerp colorspace, png_const_charp name,
1704 png_uint_32 profile_length,
1705 png_const_bytep profile /* first 132 bytes only */, int color_type),
1706 PNG_EMPTY);
1707 PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr,
1708 png_colorspacerp colorspace, png_const_charp name,
1709 png_uint_32 profile_length,
1710 png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY);
1711 #ifdef PNG_sRGB_SUPPORTED
1712 PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,(
1713 png_const_structrp png_ptr, png_colorspacerp colorspace,
1714 png_const_bytep profile, uLong adler), PNG_EMPTY);
1715 /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may
1716 * be zero to indicate that it is not available. It is used, if provided,
1717 * as a fast check on the profile when checking to see if it is sRGB.
1718 */
1719 #endif
1720 #endif /* iCCP */
1721
1722 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
1723 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients,
1724 (png_structrp png_ptr), PNG_EMPTY);
1725 /* Set the rgb_to_gray coefficients from the colorspace Y values */
1726 #endif /* READ_RGB_TO_GRAY */
1727 #endif /* COLORSPACE */
1728
1729 /* Added at libpng version 1.4.0 */
1730 PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr,
1731 png_uint_32 width, png_uint_32 height, int bit_depth,
1732 int color_type, int interlace_type, int compression_type,
1733 int filter_type),PNG_EMPTY);
1734
1735 /* Added at libpng version 1.5.10 */
1736 #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \
1737 defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED)
1738 PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes,
1739 (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY);
1740 #endif
1741
1742 #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
1743 PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr,
1744 png_const_charp name),PNG_NORETURN);
1745 #endif
1746
1747 /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite
1748 * the end. Always leaves the buffer nul terminated. Never errors out (and
1749 * there is no error code.)
1750 */
1751 PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize,
1752 size_t pos, png_const_charp string),PNG_EMPTY);
1753
1754 /* Various internal functions to handle formatted warning messages, currently
1755 * only implemented for warnings.
1756 */
1757 #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)
1758 /* Utility to dump an unsigned value into a buffer, given a start pointer and
1759 * and end pointer (which should point just *beyond* the end of the buffer!)
1760 * Returns the pointer to the start of the formatted string. This utility only
1761 * does unsigned values.
1762 */
1763 PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start,
1764 png_charp end, int format, png_alloc_size_t number),PNG_EMPTY);
1765
1766 /* Convenience macro that takes an array: */
1767 #define PNG_FORMAT_NUMBER(buffer,format,number) \
1768 png_format_number(buffer, buffer + (sizeof buffer), format, number)
1769
1770 /* Suggested size for a number buffer (enough for 64 bits and a sign!) */
1771 #define PNG_NUMBER_BUFFER_SIZE 24
1772
1773 /* These are the integer formats currently supported, the name is formed from
1774 * the standard printf(3) format string.
1775 */
1776 #define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */
1777 #define PNG_NUMBER_FORMAT_02u 2
1778 #define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */
1779 #define PNG_NUMBER_FORMAT_02d 2
1780 #define PNG_NUMBER_FORMAT_x 3
1781 #define PNG_NUMBER_FORMAT_02x 4
1782 #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */
1783 #endif
1784
1785 #ifdef PNG_WARNINGS_SUPPORTED
1786 /* New defines and members adding in libpng-1.5.4 */
1787 # define PNG_WARNING_PARAMETER_SIZE 32
1788 # define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */
1789
1790 /* An l-value of this type has to be passed to the APIs below to cache the
1791 * values of the parameters to a formatted warning message.
1792 */
1793 typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][
1794 PNG_WARNING_PARAMETER_SIZE];
1795
1796 PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p,
1797 int number, png_const_charp string),PNG_EMPTY);
1798 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters,
1799 * including the trailing '\0'.
1800 */
1801 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned,
1802 (png_warning_parameters p, int number, int format, png_alloc_size_t value),
1803 PNG_EMPTY);
1804 /* Use png_alloc_size_t because it is an unsigned type as big as any we
1805 * need to output. Use the following for a signed value.
1806 */
1807 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed,
1808 (png_warning_parameters p, int number, int format, png_int_32 value),
1809 PNG_EMPTY);
1810
1811 PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr,
1812 png_warning_parameters p, png_const_charp message),PNG_EMPTY);
1813 /* 'message' follows the X/Open approach of using @1, @2 to insert
1814 * parameters previously supplied using the above functions. Errors in
1815 * specifying the parameters will simply result in garbage substitutions.
1816 */
1817 #endif
1818
1819 #ifdef PNG_BENIGN_ERRORS_SUPPORTED
1820 /* Application errors (new in 1.6); use these functions (declared below) for
1821 * errors in the parameters or order of API function calls on read. The
1822 * 'warning' should be used for an error that can be handled completely; the
1823 * 'error' for one which can be handled safely but which may lose application
1824 * information or settings.
1825 *
1826 * By default these both result in a png_error call prior to release, while in a
1827 * released version the 'warning' is just a warning. However if the application
1828 * explicitly disables benign errors (explicitly permitting the code to lose
1829 * information) they both turn into warnings.
1830 *
1831 * If benign errors aren't supported they end up as the corresponding base call
1832 * (png_warning or png_error.)
1833 */
1834 PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr,
1835 png_const_charp message),PNG_EMPTY);
1836 /* The application provided invalid parameters to an API function or called
1837 * an API function at the wrong time, libpng can completely recover.
1838 */
1839
1840 PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr,
1841 png_const_charp message),PNG_EMPTY);
1842 /* As above but libpng will ignore the call, or attempt some other partial
1843 * recovery from the error.
1844 */
1845 #else
1846 # define png_app_warning(pp,s) png_warning(pp,s)
1847 # define png_app_error(pp,s) png_error(pp,s)
1848 #endif
1849
1850 PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr,
1851 png_const_charp message, int error),PNG_EMPTY);
1852 /* Report a recoverable issue in chunk data. On read this is used to report
1853 * a problem found while reading a particular chunk and the
1854 * png_chunk_benign_error or png_chunk_warning function is used as
1855 * appropriate. On write this is used to report an error that comes from
1856 * data set via an application call to a png_set_ API and png_app_error or
1857 * png_app_warning is used as appropriate.
1858 *
1859 * The 'error' parameter must have one of the following values:
1860 */
1861 #define PNG_CHUNK_WARNING 0 /* never an error */
1862 #define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */
1863 #define PNG_CHUNK_ERROR 2 /* always an error */
1864
1865 /* ASCII to FP interfaces, currently only implemented if sCAL
1866 * support is required.
1867 */
1868 #if defined(PNG_sCAL_SUPPORTED)
1869 /* MAX_DIGITS is actually the maximum number of characters in an sCAL
1870 * width or height, derived from the precision (number of significant
1871 * digits - a build time settable option) and assumptions about the
1872 * maximum ridiculous exponent.
1873 */
1874 #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/)
1875
1876 #ifdef PNG_FLOATING_POINT_SUPPORTED
1877 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr,
1878 png_charp ascii, png_size_t size, double fp, unsigned int precision),
1879 PNG_EMPTY);
1880 #endif /* FLOATING_POINT */
1881
1882 #ifdef PNG_FIXED_POINT_SUPPORTED
1883 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr,
1884 png_charp ascii, png_size_t size, png_fixed_point fp),PNG_EMPTY);
1885 #endif /* FIXED_POINT */
1886 #endif /* sCAL */
1887
1888 #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED)
1889 /* An internal API to validate the format of a floating point number.
1890 * The result is the index of the next character. If the number is
1891 * not valid it will be the index of a character in the supposed number.
1892 *
1893 * The format of a number is defined in the PNG extensions specification
1894 * and this API is strictly conformant to that spec, not anyone elses!
1895 *
1896 * The format as a regular expression is:
1897 *
1898 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)?
1899 *
1900 * or:
1901 *
1902 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)?
1903 *
1904 * The complexity is that either integer or fraction must be present and the
1905 * fraction is permitted to have no digits only if the integer is present.
1906 *
1907 * NOTE: The dangling E problem.
1908 * There is a PNG valid floating point number in the following:
1909 *
1910 * PNG floating point numbers are not greedy.
1911 *
1912 * Working this out requires *TWO* character lookahead (because of the
1913 * sign), the parser does not do this - it will fail at the 'r' - this
1914 * doesn't matter for PNG sCAL chunk values, but it requires more care
1915 * if the value were ever to be embedded in something more complex. Use
1916 * ANSI-C strtod if you need the lookahead.
1917 */
1918 /* State table for the parser. */
1919 #define PNG_FP_INTEGER 0 /* before or in integer */
1920 #define PNG_FP_FRACTION 1 /* before or in fraction */
1921 #define PNG_FP_EXPONENT 2 /* before or in exponent */
1922 #define PNG_FP_STATE 3 /* mask for the above */
1923 #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */
1924 #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */
1925 #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */
1926 #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */
1927 #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */
1928
1929 /* These three values don't affect the parser. They are set but not used.
1930 */
1931 #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */
1932 #define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */
1933 #define PNG_FP_NONZERO 256 /* A non-zero value */
1934 #define PNG_FP_STICKY 448 /* The above three flags */
1935
1936 /* This is available for the caller to store in 'state' if required. Do not
1937 * call the parser after setting it (the parser sometimes clears it.)
1938 */
1939 #define PNG_FP_INVALID 512 /* Available for callers as a distinct value */
1940
1941 /* Result codes for the parser (boolean - true meants ok, false means
1942 * not ok yet.)
1943 */
1944 #define PNG_FP_MAYBE 0 /* The number may be valid in the future */
1945 #define PNG_FP_OK 1 /* The number is valid */
1946
1947 /* Tests on the sticky non-zero and negative flags. To pass these checks
1948 * the state must also indicate that the whole number is valid - this is
1949 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this
1950 * is equivalent to PNG_FP_OK above.)
1951 */
1952 #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO)
1953 /* NZ_MASK: the string is valid and a non-zero negative value */
1954 #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO)
1955 /* Z MASK: the string is valid and a non-zero value. */
1956 /* PNG_FP_SAW_DIGIT: the string is valid. */
1957 #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT)
1958 #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK)
1959 #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK)
1960
1961 /* The actual parser. This can be called repeatedly. It updates
1962 * the index into the string and the state variable (which must
1963 * be initialized to 0). It returns a result code, as above. There
1964 * is no point calling the parser any more if it fails to advance to
1965 * the end of the string - it is stuck on an invalid character (or
1966 * terminated by '\0').
1967 *
1968 * Note that the pointer will consume an E or even an E+ and then leave
1969 * a 'maybe' state even though a preceding integer.fraction is valid.
1970 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was
1971 * a valid number. It's possible to recover from this by calling
1972 * the parser again (from the start, with state 0) but with a string
1973 * that omits the last character (i.e. set the size to the index of
1974 * the problem character.) This has not been tested within libpng.
1975 */
1976 PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string,
1977 png_size_t size, int *statep, png_size_tp whereami),PNG_EMPTY);
1978
1979 /* This is the same but it checks a complete string and returns true
1980 * only if it just contains a floating point number. As of 1.5.4 this
1981 * function also returns the state at the end of parsing the number if
1982 * it was valid (otherwise it returns 0.) This can be used for testing
1983 * for negative or zero values using the sticky flag.
1984 */
1985 PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string,
1986 png_size_t size),PNG_EMPTY);
1987 #endif /* pCAL || sCAL */
1988
1989 #if defined(PNG_GAMMA_SUPPORTED) ||\
1990 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED)
1991 /* Added at libpng version 1.5.0 */
1992 /* This is a utility to provide a*times/div (rounded) and indicate
1993 * if there is an overflow. The result is a boolean - false (0)
1994 * for overflow, true (1) if no overflow, in which case *res
1995 * holds the result.
1996 */
1997 PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a,
1998 png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY);
1999 #endif
2000
2001 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED)
2002 /* Same deal, but issue a warning on overflow and return 0. */
2003 PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn,
2004 (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by,
2005 png_int_32 divided_by),PNG_EMPTY);
2006 #endif
2007
2008 #ifdef PNG_GAMMA_SUPPORTED
2009 /* Calculate a reciprocal - used for gamma values. This returns
2010 * 0 if the argument is 0 in order to maintain an undefined value;
2011 * there are no warnings.
2012 */
2013 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a),
2014 PNG_EMPTY);
2015
2016 #ifdef PNG_READ_GAMMA_SUPPORTED
2017 /* The same but gives a reciprocal of the product of two fixed point
2018 * values. Accuracy is suitable for gamma calculations but this is
2019 * not exact - use png_muldiv for that. Only required at present on read.
2020 */
2021 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a,
2022 png_fixed_point b),PNG_EMPTY);
2023 #endif
2024
2025 /* Return true if the gamma value is significantly different from 1.0 */
2026 PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value),
2027 PNG_EMPTY);
2028 #endif
2029
2030 #ifdef PNG_READ_GAMMA_SUPPORTED
2031 /* Internal fixed point gamma correction. These APIs are called as
2032 * required to convert single values - they don't need to be fast,
2033 * they are not used when processing image pixel values.
2034 *
2035 * While the input is an 'unsigned' value it must actually be the
2036 * correct bit value - 0..255 or 0..65535 as required.
2037 */
2038 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr,
2039 unsigned int value, png_fixed_point gamma_value),PNG_EMPTY);
2040 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value,
2041 png_fixed_point gamma_value),PNG_EMPTY);
2042 PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value,
2043 png_fixed_point gamma_value),PNG_EMPTY);
2044 PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr),
2045 PNG_EMPTY);
2046 PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr,
2047 int bit_depth),PNG_EMPTY);
2048 #endif
2049
2050 /* SIMPLIFIED READ/WRITE SUPPORT */
2051 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
2052 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
2053 /* The internal structure that png_image::opaque points to. */
2054 typedef struct png_control
2055 {
2056 png_structp png_ptr;
2057 png_infop info_ptr;
2058 png_voidp error_buf; /* Always a jmp_buf at present. */
2059
2060 png_const_bytep memory; /* Memory buffer. */
2061 png_size_t size; /* Size of the memory buffer. */
2062
2063 unsigned int for_write :1; /* Otherwise it is a read structure */
2064 unsigned int owned_file :1; /* We own the file in io_ptr */
2065 } png_control;
2066
2067 /* Return the pointer to the jmp_buf from a png_control: necessary because C
2068 * does not reveal the type of the elements of jmp_buf.
2069 */
2070 #ifdef __cplusplus
2071 # define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0])
2072 #else
2073 # define png_control_jmp_buf(pc) ((pc)->error_buf)
2074 #endif
2075
2076 /* Utility to safely execute a piece of libpng code catching and logging any
2077 * errors that might occur. Returns true on success, false on failure (either
2078 * of the function or as a result of a png_error.)
2079 */
2080 PNG_INTERNAL_CALLBACK(void,png_safe_error,(png_structp png_ptr,
2081 png_const_charp error_message),PNG_NORETURN);
2082
2083 #ifdef PNG_WARNINGS_SUPPORTED
2084 PNG_INTERNAL_CALLBACK(void,png_safe_warning,(png_structp png_ptr,
2085 png_const_charp warning_message),PNG_EMPTY);
2086 #else
2087 # define png_safe_warning 0/*dummy argument*/
2088 #endif
2089
2090 PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image,
2091 int (*function)(png_voidp), png_voidp arg),PNG_EMPTY);
2092
2093 /* Utility to log an error; this also cleans up the png_image; the function
2094 * always returns 0 (false).
2095 */
2096 PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image,
2097 png_const_charp error_message),PNG_EMPTY);
2098
2099 #ifndef PNG_SIMPLIFIED_READ_SUPPORTED
2100 /* png_image_free is used by the write code but not exported */
2101 PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY);
2102 #endif /* !SIMPLIFIED_READ */
2103
2104 #endif /* SIMPLIFIED READ/WRITE */
2105
2106 /* These are initialization functions for hardware specific PNG filter
2107 * optimizations; list these here then select the appropriate one at compile
2108 * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined
2109 * the generic code is used.
2110 */
2111 #ifdef PNG_FILTER_OPTIMIZATIONS
2112 PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr,
2113 unsigned int bpp), PNG_EMPTY);
2114 /* Just declare the optimization that will be used */
2115 #else
2116 /* List *all* the possible optimizations here - this branch is required if
2117 * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in
2118 * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing.
2119 */
2120 # if PNG_ARM_NEON_OPT > 0
2121 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon,
2122 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
2123 #endif
2124
2125 #if PNG_MIPS_MSA_OPT > 0
2126 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_msa,
2127 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
2128 #endif
2129
2130 # if PNG_INTEL_SSE_IMPLEMENTATION > 0
2131 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_sse2,
2132 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
2133 # endif
2134 #endif
2135
2136 PNG_INTERNAL_FUNCTION(png_uint_32, png_check_keyword, (png_structrp png_ptr,
2137 png_const_charp key, png_bytep new_key), PNG_EMPTY);
2138
2139 /* Maintainer: Put new private prototypes here ^ */
2140
2141 #include "pngdebug.h"
2142
2143 #ifdef __cplusplus
2144 }
2145 #endif
2146
2147 #endif /* PNG_VERSION_INFO_ONLY */
2148 #endif /* PNGPRIV_H */