1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation. Oracle designates this
7 * particular file as subject to the "Classpath" exception as provided
8 * by Oracle in the LICENSE file that accompanied this code.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 */
24
25 /* pngpriv.h - private declarations for use inside libpng
26 *
27 * This file is available under and governed by the GNU General Public
28 * License version 2 only, as published by the Free Software Foundation.
29 * However, the following notice accompanied the original version of this
30 * file and, per its terms, should not be removed:
31 *
32 * Copyright (c) 2018-2019 Cosmin Truta
33 * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
34 * Copyright (c) 1996-1997 Andreas Dilger
35 * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
36 *
37 * This code is released under the libpng license.
38 * For conditions of distribution and use, see the disclaimer
39 * and license in png.h
40 */
41
42 /* The symbols declared in this file (including the functions declared
43 * as extern) are PRIVATE. They are not part of the libpng public
44 * interface, and are not recommended for use by regular applications.
45 * Some of them may become public in the future; others may stay private,
46 * change in an incompatible way, or even disappear.
47 * Although the libpng users are not forbidden to include this header,
48 * they should be well aware of the issues that may arise from doing so.
49 */
50
51 #ifndef PNGPRIV_H
52 #define PNGPRIV_H
53
54 /* Feature Test Macros. The following are defined here to ensure that correctly
55 * implemented libraries reveal the APIs libpng needs to build and hide those
56 * that are not needed and potentially damaging to the compilation.
57 *
58 * Feature Test Macros must be defined before any system header is included (see
59 * POSIX 1003.1 2.8.2 "POSIX Symbols."
60 *
61 * These macros only have an effect if the operating system supports either
62 * POSIX 1003.1 or C99, or both. On other operating systems (particularly
63 * Windows/Visual Studio) there is no effect; the OS specific tests below are
64 * still required (as of 2011-05-02.)
65 */
66 #ifndef _POSIX_SOURCE
67 # define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */
68 #endif
69
70 #ifndef PNG_VERSION_INFO_ONLY
71 /* Standard library headers not required by png.h: */
72 # include <stdlib.h>
73 # include <string.h>
74 #endif
75
76 #define PNGLIB_BUILD /*libpng is being built, not used*/
77
78 /* If HAVE_CONFIG_H is defined during the build then the build system must
79 * provide an appropriate "config.h" file on the include path. The header file
80 * must provide definitions as required below (search for "HAVE_CONFIG_H");
81 * see configure.ac for more details of the requirements. The macro
82 * "PNG_NO_CONFIG_H" is provided for maintainers to test for dependencies on
83 * 'configure'; define this macro to prevent the configure build including the
84 * configure generated config.h. Libpng is expected to compile without *any*
85 * special build system support on a reasonably ANSI-C compliant system.
86 */
87 #if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H)
88 # include <config.h>
89
90 /* Pick up the definition of 'restrict' from config.h if it was read: */
91 # define PNG_RESTRICT restrict
92 #endif
93
94 /* To support symbol prefixing it is necessary to know *before* including png.h
95 * whether the fixed point (and maybe other) APIs are exported, because if they
96 * are not internal definitions may be required. This is handled below just
97 * before png.h is included, but load the configuration now if it is available.
98 */
99 #ifndef PNGLCONF_H
100 # include "pnglibconf.h"
101 #endif
102
103 /* Local renames may change non-exported API functions from png.h */
104 #if defined(PNG_PREFIX) && !defined(PNGPREFIX_H)
105 # include "pngprefix.h"
106 #endif
107
108 #ifdef PNG_USER_CONFIG
109 # include "pngusr.h"
110 /* These should have been defined in pngusr.h */
111 # ifndef PNG_USER_PRIVATEBUILD
112 # define PNG_USER_PRIVATEBUILD "Custom libpng build"
113 # endif
114 # ifndef PNG_USER_DLLFNAME_POSTFIX
115 # define PNG_USER_DLLFNAME_POSTFIX "Cb"
116 # endif
117 #endif
118
119 /* Compile time options.
120 * =====================
121 * In a multi-arch build the compiler may compile the code several times for the
122 * same object module, producing different binaries for different architectures.
123 * When this happens configure-time setting of the target host options cannot be
124 * done and this interferes with the handling of the ARM NEON optimizations, and
125 * possibly other similar optimizations. Put additional tests here; in general
126 * this is needed when the same option can be changed at both compile time and
127 * run time depending on the target OS (i.e. iOS vs Android.)
128 *
129 * NOTE: symbol prefixing does not pass $(CFLAGS) to the preprocessor, because
130 * this is not possible with certain compilers (Oracle SUN OS CC), as a result
131 * it is necessary to ensure that all extern functions that *might* be used
132 * regardless of $(CFLAGS) get declared in this file. The test on __ARM_NEON__
133 * below is one example of this behavior because it is controlled by the
134 * presence or not of -mfpu=neon on the GCC command line, it is possible to do
135 * this in $(CC), e.g. "CC=gcc -mfpu=neon", but people who build libpng rarely
136 * do this.
137 */
138 #ifndef PNG_ARM_NEON_OPT
139 /* ARM NEON optimizations are being controlled by the compiler settings,
140 * typically the target FPU. If the FPU has been set to NEON (-mfpu=neon
141 * with GCC) then the compiler will define __ARM_NEON__ and we can rely
142 * unconditionally on NEON instructions not crashing, otherwise we must
143 * disable use of NEON instructions.
144 *
145 * NOTE: at present these optimizations depend on 'ALIGNED_MEMORY', so they
146 * can only be turned on automatically if that is supported too. If
147 * PNG_ARM_NEON_OPT is set in CPPFLAGS (to >0) then arm/arm_init.c will fail
148 * to compile with an appropriate #error if ALIGNED_MEMORY has been turned
149 * off.
150 *
151 * Note that gcc-4.9 defines __ARM_NEON instead of the deprecated
152 * __ARM_NEON__, so we check both variants.
153 *
154 * To disable ARM_NEON optimizations entirely, and skip compiling the
155 * associated assembler code, pass --enable-arm-neon=no to configure
156 * or put -DPNG_ARM_NEON_OPT=0 in CPPFLAGS.
157 */
158 # if (defined(__ARM_NEON__) || defined(__ARM_NEON)) && \
159 defined(PNG_ALIGNED_MEMORY_SUPPORTED)
160 # define PNG_ARM_NEON_OPT 2
161 # else
162 # define PNG_ARM_NEON_OPT 0
163 # endif
164 #endif
165
166 #if PNG_ARM_NEON_OPT > 0
167 /* NEON optimizations are to be at least considered by libpng, so enable the
168 * callbacks to do this.
169 */
170 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_neon
171
172 /* By default the 'intrinsics' code in arm/filter_neon_intrinsics.c is used
173 * if possible - if __ARM_NEON__ is set and the compiler version is not known
174 * to be broken. This is controlled by PNG_ARM_NEON_IMPLEMENTATION which can
175 * be:
176 *
177 * 1 The intrinsics code (the default with __ARM_NEON__)
178 * 2 The hand coded assembler (the default without __ARM_NEON__)
179 *
180 * It is possible to set PNG_ARM_NEON_IMPLEMENTATION in CPPFLAGS, however
181 * this is *NOT* supported and may cease to work even after a minor revision
182 * to libpng. It *is* valid to do this for testing purposes, e.g. speed
183 * testing or a new compiler, but the results should be communicated to the
184 * libpng implementation list for incorporation in the next minor release.
185 */
186 # ifndef PNG_ARM_NEON_IMPLEMENTATION
187 # if defined(__ARM_NEON__) || defined(__ARM_NEON)
188 # if defined(__clang__)
189 /* At present it is unknown by the libpng developers which versions
190 * of clang support the intrinsics, however some or perhaps all
191 * versions do not work with the assembler so this may be
192 * irrelevant, so just use the default (do nothing here.)
193 */
194 # elif defined(__GNUC__)
195 /* GCC 4.5.4 NEON support is known to be broken. 4.6.3 is known to
196 * work, so if this *is* GCC, or G++, look for a version >4.5
197 */
198 # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)
199 # define PNG_ARM_NEON_IMPLEMENTATION 2
200 # endif /* no GNUC support */
201 # endif /* __GNUC__ */
202 # else /* !defined __ARM_NEON__ */
203 /* The 'intrinsics' code simply won't compile without this -mfpu=neon:
204 */
205 # if !defined(__aarch64__)
206 /* The assembler code currently does not work on ARM64 */
207 # define PNG_ARM_NEON_IMPLEMENTATION 2
208 # endif /* __aarch64__ */
209 # endif /* __ARM_NEON__ */
210 # endif /* !PNG_ARM_NEON_IMPLEMENTATION */
211
212 # ifndef PNG_ARM_NEON_IMPLEMENTATION
213 /* Use the intrinsics code by default. */
214 # define PNG_ARM_NEON_IMPLEMENTATION 1
215 # endif
216 #endif /* PNG_ARM_NEON_OPT > 0 */
217
218 #ifndef PNG_MIPS_MSA_OPT
219 # if defined(__mips_msa) && (__mips_isa_rev >= 5) && defined(PNG_ALIGNED_MEMORY_SUPPORTED)
220 # define PNG_MIPS_MSA_OPT 2
221 # else
222 # define PNG_MIPS_MSA_OPT 0
223 # endif
224 #endif
225
226 #ifndef PNG_POWERPC_VSX_OPT
227 # if defined(__PPC64__) && defined(__ALTIVEC__) && defined(__VSX__)
228 # define PNG_POWERPC_VSX_OPT 2
229 # else
230 # define PNG_POWERPC_VSX_OPT 0
231 # endif
232 #endif
233
234 #ifndef PNG_INTEL_SSE_OPT
235 # ifdef PNG_INTEL_SSE
236 /* Only check for SSE if the build configuration has been modified to
237 * enable SSE optimizations. This means that these optimizations will
238 * be off by default. See contrib/intel for more details.
239 */
240 # if defined(__SSE4_1__) || defined(__AVX__) || defined(__SSSE3__) || \
241 defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \
242 (defined(_M_IX86_FP) && _M_IX86_FP >= 2)
243 # define PNG_INTEL_SSE_OPT 1
244 # else
245 # define PNG_INTEL_SSE_OPT 0
246 # endif
247 # else
248 # define PNG_INTEL_SSE_OPT 0
249 # endif
250 #endif
251
252 #if PNG_INTEL_SSE_OPT > 0
253 # ifndef PNG_INTEL_SSE_IMPLEMENTATION
254 # if defined(__SSE4_1__) || defined(__AVX__)
255 /* We are not actually using AVX, but checking for AVX is the best
256 way we can detect SSE4.1 and SSSE3 on MSVC.
257 */
258 # define PNG_INTEL_SSE_IMPLEMENTATION 3
259 # elif defined(__SSSE3__)
260 # define PNG_INTEL_SSE_IMPLEMENTATION 2
261 # elif defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \
262 (defined(_M_IX86_FP) && _M_IX86_FP >= 2)
263 # define PNG_INTEL_SSE_IMPLEMENTATION 1
264 # else
265 # define PNG_INTEL_SSE_IMPLEMENTATION 0
266 # endif
267 # endif
268
269 # if PNG_INTEL_SSE_IMPLEMENTATION > 0
270 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_sse2
271 # endif
272 #else
273 # define PNG_INTEL_SSE_IMPLEMENTATION 0
274 #endif
275
276 #if PNG_MIPS_MSA_OPT > 0
277 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_msa
278 # ifndef PNG_MIPS_MSA_IMPLEMENTATION
279 # if defined(__mips_msa)
280 # if defined(__clang__)
281 # elif defined(__GNUC__)
282 # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7)
283 # define PNG_MIPS_MSA_IMPLEMENTATION 2
284 # endif /* no GNUC support */
285 # endif /* __GNUC__ */
286 # else /* !defined __mips_msa */
287 # define PNG_MIPS_MSA_IMPLEMENTATION 2
288 # endif /* __mips_msa */
289 # endif /* !PNG_MIPS_MSA_IMPLEMENTATION */
290
291 # ifndef PNG_MIPS_MSA_IMPLEMENTATION
292 # define PNG_MIPS_MSA_IMPLEMENTATION 1
293 # endif
294 #endif /* PNG_MIPS_MSA_OPT > 0 */
295
296 #if PNG_POWERPC_VSX_OPT > 0
297 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_vsx
298 # define PNG_POWERPC_VSX_IMPLEMENTATION 1
299 #endif
300
301
302 /* Is this a build of a DLL where compilation of the object modules requires
303 * different preprocessor settings to those required for a simple library? If
304 * so PNG_BUILD_DLL must be set.
305 *
306 * If libpng is used inside a DLL but that DLL does not export the libpng APIs
307 * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a
308 * static library of libpng then link the DLL against that.
309 */
310 #ifndef PNG_BUILD_DLL
311 # ifdef DLL_EXPORT
312 /* This is set by libtool when files are compiled for a DLL; libtool
313 * always compiles twice, even on systems where it isn't necessary. Set
314 * PNG_BUILD_DLL in case it is necessary:
315 */
316 # define PNG_BUILD_DLL
317 # else
318 # ifdef _WINDLL
319 /* This is set by the Microsoft Visual Studio IDE in projects that
320 * build a DLL. It can't easily be removed from those projects (it
321 * isn't visible in the Visual Studio UI) so it is a fairly reliable
322 * indication that PNG_IMPEXP needs to be set to the DLL export
323 * attributes.
324 */
325 # define PNG_BUILD_DLL
326 # else
327 # ifdef __DLL__
328 /* This is set by the Borland C system when compiling for a DLL
329 * (as above.)
330 */
331 # define PNG_BUILD_DLL
332 # else
333 /* Add additional compiler cases here. */
334 # endif
335 # endif
336 # endif
337 #endif /* Setting PNG_BUILD_DLL if required */
338
339 /* See pngconf.h for more details: the builder of the library may set this on
340 * the command line to the right thing for the specific compilation system or it
341 * may be automagically set above (at present we know of no system where it does
342 * need to be set on the command line.)
343 *
344 * PNG_IMPEXP must be set here when building the library to prevent pngconf.h
345 * setting it to the "import" setting for a DLL build.
346 */
347 #ifndef PNG_IMPEXP
348 # ifdef PNG_BUILD_DLL
349 # define PNG_IMPEXP PNG_DLL_EXPORT
350 # else
351 /* Not building a DLL, or the DLL doesn't require specific export
352 * definitions.
353 */
354 # define PNG_IMPEXP
355 # endif
356 #endif
357
358 /* No warnings for private or deprecated functions in the build: */
359 #ifndef PNG_DEPRECATED
360 # define PNG_DEPRECATED
361 #endif
362 #ifndef PNG_PRIVATE
363 # define PNG_PRIVATE
364 #endif
365
366 /* Symbol preprocessing support.
367 *
368 * To enable listing global, but internal, symbols the following macros should
369 * always be used to declare an extern data or function object in this file.
370 */
371 #ifndef PNG_INTERNAL_DATA
372 # define PNG_INTERNAL_DATA(type, name, array) PNG_LINKAGE_DATA type name array
373 #endif
374
375 #ifndef PNG_INTERNAL_FUNCTION
376 # define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\
377 PNG_LINKAGE_FUNCTION PNG_FUNCTION(type, name, args, PNG_EMPTY attributes)
378 #endif
379
380 #ifndef PNG_INTERNAL_CALLBACK
381 # define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\
382 PNG_LINKAGE_CALLBACK PNG_FUNCTION(type, (PNGCBAPI name), args,\
383 PNG_EMPTY attributes)
384 #endif
385
386 /* If floating or fixed point APIs are disabled they may still be compiled
387 * internally. To handle this make sure they are declared as the appropriate
388 * internal extern function (otherwise the symbol prefixing stuff won't work and
389 * the functions will be used without definitions.)
390 *
391 * NOTE: although all the API functions are declared here they are not all
392 * actually built! Because the declarations are still made it is necessary to
393 * fake out types that they depend on.
394 */
395 #ifndef PNG_FP_EXPORT
396 # ifndef PNG_FLOATING_POINT_SUPPORTED
397 # define PNG_FP_EXPORT(ordinal, type, name, args)\
398 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
399 # ifndef PNG_VERSION_INFO_ONLY
400 typedef struct png_incomplete png_double;
401 typedef png_double* png_doublep;
402 typedef const png_double* png_const_doublep;
403 typedef png_double** png_doublepp;
404 # endif
405 # endif
406 #endif
407 #ifndef PNG_FIXED_EXPORT
408 # ifndef PNG_FIXED_POINT_SUPPORTED
409 # define PNG_FIXED_EXPORT(ordinal, type, name, args)\
410 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
411 # endif
412 #endif
413
414 #include "png.h"
415
416 /* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */
417 #ifndef PNG_DLL_EXPORT
418 # define PNG_DLL_EXPORT
419 #endif
420
421 /* This is a global switch to set the compilation for an installed system
422 * (a release build). It can be set for testing debug builds to ensure that
423 * they will compile when the build type is switched to RC or STABLE, the
424 * default is just to use PNG_LIBPNG_BUILD_BASE_TYPE. Set this in CPPFLAGS
425 * with either:
426 *
427 * -DPNG_RELEASE_BUILD Turns on the release compile path
428 * -DPNG_RELEASE_BUILD=0 Turns it off
429 * or in your pngusr.h with
430 * #define PNG_RELEASE_BUILD=1 Turns on the release compile path
431 * #define PNG_RELEASE_BUILD=0 Turns it off
432 */
433 #ifndef PNG_RELEASE_BUILD
434 # define PNG_RELEASE_BUILD (PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC)
435 #endif
436
437 /* SECURITY and SAFETY:
438 *
439 * libpng is built with support for internal limits on image dimensions and
440 * memory usage. These are documented in scripts/pnglibconf.dfa of the
441 * source and recorded in the machine generated header file pnglibconf.h.
442 */
443
444 /* If you are running on a machine where you cannot allocate more
445 * than 64K of memory at once, uncomment this. While libpng will not
446 * normally need that much memory in a chunk (unless you load up a very
447 * large file), zlib needs to know how big of a chunk it can use, and
448 * libpng thus makes sure to check any memory allocation to verify it
449 * will fit into memory.
450 *
451 * zlib provides 'MAXSEG_64K' which, if defined, indicates the
452 * same limit and pngconf.h (already included) sets the limit
453 * if certain operating systems are detected.
454 */
455 #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
456 # define PNG_MAX_MALLOC_64K
457 #endif
458
459 #ifndef PNG_UNUSED
460 /* Unused formal parameter warnings are silenced using the following macro
461 * which is expected to have no bad effects on performance (optimizing
462 * compilers will probably remove it entirely). Note that if you replace
463 * it with something other than whitespace, you must include the terminating
464 * semicolon.
465 */
466 # define PNG_UNUSED(param) (void)param;
467 #endif
468
469 /* Just a little check that someone hasn't tried to define something
470 * contradictory.
471 */
472 #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K)
473 # undef PNG_ZBUF_SIZE
474 # define PNG_ZBUF_SIZE 65536L
475 #endif
476
477 /* If warnings or errors are turned off the code is disabled or redirected here.
478 * From 1.5.4 functions have been added to allow very limited formatting of
479 * error and warning messages - this code will also be disabled here.
480 */
481 #ifdef PNG_WARNINGS_SUPPORTED
482 # define PNG_WARNING_PARAMETERS(p) png_warning_parameters p;
483 #else
484 # define png_warning_parameter(p,number,string) ((void)0)
485 # define png_warning_parameter_unsigned(p,number,format,value) ((void)0)
486 # define png_warning_parameter_signed(p,number,format,value) ((void)0)
487 # define png_formatted_warning(pp,p,message) ((void)(pp))
488 # define PNG_WARNING_PARAMETERS(p)
489 #endif
490 #ifndef PNG_ERROR_TEXT_SUPPORTED
491 # define png_fixed_error(s1,s2) png_err(s1)
492 #endif
493
494 /* Some fixed point APIs are still required even if not exported because
495 * they get used by the corresponding floating point APIs. This magic
496 * deals with this:
497 */
498 #ifdef PNG_FIXED_POINT_SUPPORTED
499 # define PNGFAPI PNGAPI
500 #else
501 # define PNGFAPI /* PRIVATE */
502 #endif
503
504 #ifndef PNG_VERSION_INFO_ONLY
505 /* Other defines specific to compilers can go here. Try to keep
506 * them inside an appropriate ifdef/endif pair for portability.
507 */
508
509 /* C allows up-casts from (void*) to any pointer and (const void*) to any
510 * pointer to a const object. C++ regards this as a type error and requires an
511 * explicit, static, cast and provides the static_cast<> rune to ensure that
512 * const is not cast away.
513 */
514 #ifdef __cplusplus
515 # define png_voidcast(type, value) static_cast<type>(value)
516 # define png_constcast(type, value) const_cast<type>(value)
517 # define png_aligncast(type, value) \
518 static_cast<type>(static_cast<void*>(value))
519 # define png_aligncastconst(type, value) \
520 static_cast<type>(static_cast<const void*>(value))
521 #else
522 # define png_voidcast(type, value) (value)
523 # ifdef _WIN64
524 # ifdef __GNUC__
525 typedef unsigned long long png_ptruint;
526 # else
527 typedef unsigned __int64 png_ptruint;
528 # endif
529 # else
530 typedef unsigned long png_ptruint;
531 # endif
532 # define png_constcast(type, value) ((type)(png_ptruint)(const void*)(value))
533 # define png_aligncast(type, value) ((void*)(value))
534 # define png_aligncastconst(type, value) ((const void*)(value))
535 #endif /* __cplusplus */
536
537 #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\
538 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
539 /* png.c requires the following ANSI-C constants if the conversion of
540 * floating point to ASCII is implemented therein:
541 *
542 * DBL_DIG Maximum number of decimal digits (can be set to any constant)
543 * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value)
544 * DBL_MAX Maximum floating point number (can be set to an arbitrary value)
545 */
546 # include <float.h>
547
548 # if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
549 defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
550 /* We need to check that <math.h> hasn't already been included earlier
551 * as it seems it doesn't agree with <fp.h>, yet we should really use
552 * <fp.h> if possible.
553 */
554 # if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
555 # include <fp.h>
556 # endif
557 # else
558 # include <math.h>
559 # endif
560 # if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
561 /* Amiga SAS/C: We must include builtin FPU functions when compiling using
562 * MATH=68881
563 */
564 # include <m68881.h>
565 # endif
566 #endif
567
568 /* This provides the non-ANSI (far) memory allocation routines. */
569 #if defined(__TURBOC__) && defined(__MSDOS__)
570 # include <mem.h>
571 # include <alloc.h>
572 #endif
573
574 #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \
575 defined(_WIN32) || defined(__WIN32__)
576 # include <windows.h> /* defines _WINDOWS_ macro */
577 #endif
578 #endif /* PNG_VERSION_INFO_ONLY */
579
580 /* Moved here around 1.5.0beta36 from pngconf.h */
581 /* Users may want to use these so they are not private. Any library
582 * functions that are passed far data must be model-independent.
583 */
584
585 /* Memory model/platform independent fns */
586 #ifndef PNG_ABORT
587 # ifdef _WINDOWS_
588 # define PNG_ABORT() ExitProcess(0)
589 # else
590 # define PNG_ABORT() abort()
591 # endif
592 #endif
593
594 /* These macros may need to be architecture dependent. */
595 #define PNG_ALIGN_NONE 0 /* do not use data alignment */
596 #define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */
597 #ifdef offsetof
598 # define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */
599 #else
600 # define PNG_ALIGN_OFFSET -1 /* prevent the use of this */
601 #endif
602 #define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */
603
604 #ifndef PNG_ALIGN_TYPE
605 /* Default to using aligned access optimizations and requiring alignment to a
606 * multiple of the data type size. Override in a compiler specific fashion
607 * if necessary by inserting tests here:
608 */
609 # define PNG_ALIGN_TYPE PNG_ALIGN_SIZE
610 #endif
611
612 #if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE
613 /* This is used because in some compiler implementations non-aligned
614 * structure members are supported, so the offsetof approach below fails.
615 * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access
616 * is good for performance. Do not do this unless you have tested the result
617 * and understand it.
618 */
619 # define png_alignof(type) (sizeof (type))
620 #else
621 # if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET
622 # define png_alignof(type) offsetof(struct{char c; type t;}, t)
623 # else
624 # if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS
625 # define png_alignof(type) (1)
626 # endif
627 /* Else leave png_alignof undefined to prevent use thereof */
628 # endif
629 #endif
630
631 /* This implicitly assumes alignment is always to a power of 2. */
632 #ifdef png_alignof
633 # define png_isaligned(ptr, type)\
634 (((type)((const char*)ptr-(const char*)0) & \
635 (type)(png_alignof(type)-1)) == 0)
636 #else
637 # define png_isaligned(ptr, type) 0
638 #endif
639
640 /* End of memory model/platform independent support */
641 /* End of 1.5.0beta36 move from pngconf.h */
642
643 /* CONSTANTS and UTILITY MACROS
644 * These are used internally by libpng and not exposed in the API
645 */
646
647 /* Various modes of operation. Note that after an init, mode is set to
648 * zero automatically when the structure is created. Three of these
649 * are defined in png.h because they need to be visible to applications
650 * that call png_set_unknown_chunk().
651 */
652 /* #define PNG_HAVE_IHDR 0x01U (defined in png.h) */
653 /* #define PNG_HAVE_PLTE 0x02U (defined in png.h) */
654 #define PNG_HAVE_IDAT 0x04U
655 /* #define PNG_AFTER_IDAT 0x08U (defined in png.h) */
656 #define PNG_HAVE_IEND 0x10U
657 /* 0x20U (unused) */
658 /* 0x40U (unused) */
659 /* 0x80U (unused) */
660 #define PNG_HAVE_CHUNK_HEADER 0x100U
661 #define PNG_WROTE_tIME 0x200U
662 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400U
663 #define PNG_BACKGROUND_IS_GRAY 0x800U
664 #define PNG_HAVE_PNG_SIGNATURE 0x1000U
665 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000U /* Have another chunk after IDAT */
666 /* 0x4000U (unused) */
667 #define PNG_IS_READ_STRUCT 0x8000U /* Else is a write struct */
668
669 /* Flags for the transformations the PNG library does on the image data */
670 #define PNG_BGR 0x0001U
671 #define PNG_INTERLACE 0x0002U
672 #define PNG_PACK 0x0004U
673 #define PNG_SHIFT 0x0008U
674 #define PNG_SWAP_BYTES 0x0010U
675 #define PNG_INVERT_MONO 0x0020U
676 #define PNG_QUANTIZE 0x0040U
677 #define PNG_COMPOSE 0x0080U /* Was PNG_BACKGROUND */
678 #define PNG_BACKGROUND_EXPAND 0x0100U
679 #define PNG_EXPAND_16 0x0200U /* Added to libpng 1.5.2 */
680 #define PNG_16_TO_8 0x0400U /* Becomes 'chop' in 1.5.4 */
681 #define PNG_RGBA 0x0800U
682 #define PNG_EXPAND 0x1000U
683 #define PNG_GAMMA 0x2000U
684 #define PNG_GRAY_TO_RGB 0x4000U
685 #define PNG_FILLER 0x8000U
686 #define PNG_PACKSWAP 0x10000U
687 #define PNG_SWAP_ALPHA 0x20000U
688 #define PNG_STRIP_ALPHA 0x40000U
689 #define PNG_INVERT_ALPHA 0x80000U
690 #define PNG_USER_TRANSFORM 0x100000U
691 #define PNG_RGB_TO_GRAY_ERR 0x200000U
692 #define PNG_RGB_TO_GRAY_WARN 0x400000U
693 #define PNG_RGB_TO_GRAY 0x600000U /* two bits, RGB_TO_GRAY_ERR|WARN */
694 #define PNG_ENCODE_ALPHA 0x800000U /* Added to libpng-1.5.4 */
695 #define PNG_ADD_ALPHA 0x1000000U /* Added to libpng-1.2.7 */
696 #define PNG_EXPAND_tRNS 0x2000000U /* Added to libpng-1.2.9 */
697 #define PNG_SCALE_16_TO_8 0x4000000U /* Added to libpng-1.5.4 */
698 /* 0x8000000U unused */
699 /* 0x10000000U unused */
700 /* 0x20000000U unused */
701 /* 0x40000000U unused */
702 /* Flags for png_create_struct */
703 #define PNG_STRUCT_PNG 0x0001U
704 #define PNG_STRUCT_INFO 0x0002U
705
706 /* Flags for the png_ptr->flags rather than declaring a byte for each one */
707 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001U
708 #define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002U /* Added to libpng-1.6.0 */
709 /* 0x0004U unused */
710 #define PNG_FLAG_ZSTREAM_ENDED 0x0008U /* Added to libpng-1.6.0 */
711 /* 0x0010U unused */
712 /* 0x0020U unused */
713 #define PNG_FLAG_ROW_INIT 0x0040U
714 #define PNG_FLAG_FILLER_AFTER 0x0080U
715 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100U
716 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200U
717 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400U
718 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800U
719 #define PNG_FLAG_ASSUME_sRGB 0x1000U /* Added to libpng-1.5.4 */
720 #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000U /* Added to libpng-1.5.4 */
721 #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000U /* Added to libpng-1.5.4 */
722 /* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000U */
723 /* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000U */
724 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000U
725 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000U
726 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000U
727 #define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000U /* Added to libpng-1.4.0 */
728 #define PNG_FLAG_APP_WARNINGS_WARN 0x200000U /* Added to libpng-1.6.0 */
729 #define PNG_FLAG_APP_ERRORS_WARN 0x400000U /* Added to libpng-1.6.0 */
730 /* 0x800000U unused */
731 /* 0x1000000U unused */
732 /* 0x2000000U unused */
733 /* 0x4000000U unused */
734 /* 0x8000000U unused */
735 /* 0x10000000U unused */
736 /* 0x20000000U unused */
737 /* 0x40000000U unused */
738
739 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
740 PNG_FLAG_CRC_ANCILLARY_NOWARN)
741
742 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
743 PNG_FLAG_CRC_CRITICAL_IGNORE)
744
745 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
746 PNG_FLAG_CRC_CRITICAL_MASK)
747
748 /* Save typing and make code easier to understand */
749
750 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
751 abs((int)((c1).green) - (int)((c2).green)) + \
752 abs((int)((c1).blue) - (int)((c2).blue)))
753
754 /* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255
755 * by dividing by 257 *with rounding*. This macro is exact for the given range.
756 * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the
757 * macro were established by experiment (modifying the added value). The macro
758 * has a second variant that takes a value already scaled by 255 and divides by
759 * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it
760 * only gives off-by-one errors and only for 0.5% (1 in 200) of the values.
761 */
762 #define PNG_DIV65535(v24) (((v24) + 32895) >> 16)
763 #define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255)
764
765 /* Added to libpng-1.2.6 JB */
766 #define PNG_ROWBYTES(pixel_bits, width) \
767 ((pixel_bits) >= 8 ? \
768 ((size_t)(width) * (((size_t)(pixel_bits)) >> 3)) : \
769 (( ((size_t)(width) * ((size_t)(pixel_bits))) + 7) >> 3) )
770
771 /* This returns the number of trailing bits in the last byte of a row, 0 if the
772 * last byte is completely full of pixels. It is, in principle, (pixel_bits x
773 * width) % 8, but that would overflow for large 'width'. The second macro is
774 * the same except that it returns the number of unused bits in the last byte;
775 * (8-TRAILBITS), but 0 when TRAILBITS is 0.
776 *
777 * NOTE: these macros are intended to be self-evidently correct and never
778 * overflow on the assumption that pixel_bits is in the range 0..255. The
779 * arguments are evaluated only once and they can be signed (e.g. as a result of
780 * the integral promotions). The result of the expression always has type
781 * (png_uint_32), however the compiler always knows it is in the range 0..7.
782 */
783 #define PNG_TRAILBITS(pixel_bits, width) \
784 (((pixel_bits) * ((width) % (png_uint_32)8)) % 8)
785
786 #define PNG_PADBITS(pixel_bits, width) \
787 ((8 - PNG_TRAILBITS(pixel_bits, width)) % 8)
788
789 /* PNG_OUT_OF_RANGE returns true if value is outside the range
790 * ideal-delta..ideal+delta. Each argument is evaluated twice.
791 * "ideal" and "delta" should be constants, normally simple
792 * integers, "value" a variable. Added to libpng-1.2.6 JB
793 */
794 #define PNG_OUT_OF_RANGE(value, ideal, delta) \
795 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
796
797 /* Conversions between fixed and floating point, only defined if
798 * required (to make sure the code doesn't accidentally use float
799 * when it is supposedly disabled.)
800 */
801 #ifdef PNG_FLOATING_POINT_SUPPORTED
802 /* The floating point conversion can't overflow, though it can and
803 * does lose accuracy relative to the original fixed point value.
804 * In practice this doesn't matter because png_fixed_point only
805 * stores numbers with very low precision. The png_ptr and s
806 * arguments are unused by default but are there in case error
807 * checking becomes a requirement.
808 */
809 #define png_float(png_ptr, fixed, s) (.00001 * (fixed))
810
811 /* The fixed point conversion performs range checking and evaluates
812 * its argument multiple times, so must be used with care. The
813 * range checking uses the PNG specification values for a signed
814 * 32-bit fixed point value except that the values are deliberately
815 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly
816 * (2^31-1) * 100000). 's' is a string that describes the value being
817 * converted.
818 *
819 * NOTE: this macro will raise a png_error if the range check fails,
820 * therefore it is normally only appropriate to use this on values
821 * that come from API calls or other sources where an out of range
822 * error indicates a programming error, not a data error!
823 *
824 * NOTE: by default this is off - the macro is not used - because the
825 * function call saves a lot of code.
826 */
827 #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED
828 #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\
829 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0))
830 #endif
831 /* else the corresponding function is defined below, inside the scope of the
832 * cplusplus test.
833 */
834 #endif
835
836 /* Constants for known chunk types. If you need to add a chunk, define the name
837 * here. For historical reasons these constants have the form png_<name>; i.e.
838 * the prefix is lower case. Please use decimal values as the parameters to
839 * match the ISO PNG specification and to avoid relying on the C locale
840 * interpretation of character values.
841 *
842 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values
843 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string
844 * to be generated if required.
845 *
846 * PNG_32b correctly produces a value shifted by up to 24 bits, even on
847 * architectures where (int) is only 16 bits.
848 */
849 #define PNG_32b(b,s) ((png_uint_32)(b) << (s))
850 #define PNG_U32(b1,b2,b3,b4) \
851 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0))
852
853 /* Constants for known chunk types.
854 *
855 * MAINTAINERS: If you need to add a chunk, define the name here.
856 * For historical reasons these constants have the form png_<name>; i.e.
857 * the prefix is lower case. Please use decimal values as the parameters to
858 * match the ISO PNG specification and to avoid relying on the C locale
859 * interpretation of character values. Please keep the list sorted.
860 *
861 * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk
862 * type. In fact the specification does not express chunk types this way,
863 * however using a 32-bit value means that the chunk type can be read from the
864 * stream using exactly the same code as used for a 32-bit unsigned value and
865 * can be examined far more efficiently (using one arithmetic compare).
866 *
867 * Prior to 1.5.6 the chunk type constants were expressed as C strings. The
868 * libpng API still uses strings for 'unknown' chunks and a macro,
869 * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice
870 * that for portable code numeric values must still be used; the string "IHDR"
871 * is not portable and neither is PNG_U32('I', 'H', 'D', 'R').
872 *
873 * In 1.7.0 the definitions will be made public in png.h to avoid having to
874 * duplicate the same definitions in application code.
875 */
876 #define png_IDAT PNG_U32( 73, 68, 65, 84)
877 #define png_IEND PNG_U32( 73, 69, 78, 68)
878 #define png_IHDR PNG_U32( 73, 72, 68, 82)
879 #define png_PLTE PNG_U32( 80, 76, 84, 69)
880 #define png_bKGD PNG_U32( 98, 75, 71, 68)
881 #define png_cHRM PNG_U32( 99, 72, 82, 77)
882 #define png_eXIf PNG_U32(101, 88, 73, 102) /* registered July 2017 */
883 #define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */
884 #define png_gAMA PNG_U32(103, 65, 77, 65)
885 #define png_gIFg PNG_U32(103, 73, 70, 103)
886 #define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */
887 #define png_gIFx PNG_U32(103, 73, 70, 120)
888 #define png_hIST PNG_U32(104, 73, 83, 84)
889 #define png_iCCP PNG_U32(105, 67, 67, 80)
890 #define png_iTXt PNG_U32(105, 84, 88, 116)
891 #define png_oFFs PNG_U32(111, 70, 70, 115)
892 #define png_pCAL PNG_U32(112, 67, 65, 76)
893 #define png_pHYs PNG_U32(112, 72, 89, 115)
894 #define png_sBIT PNG_U32(115, 66, 73, 84)
895 #define png_sCAL PNG_U32(115, 67, 65, 76)
896 #define png_sPLT PNG_U32(115, 80, 76, 84)
897 #define png_sRGB PNG_U32(115, 82, 71, 66)
898 #define png_sTER PNG_U32(115, 84, 69, 82)
899 #define png_tEXt PNG_U32(116, 69, 88, 116)
900 #define png_tIME PNG_U32(116, 73, 77, 69)
901 #define png_tRNS PNG_U32(116, 82, 78, 83)
902 #define png_zTXt PNG_U32(122, 84, 88, 116)
903
904 /* The following will work on (signed char*) strings, whereas the get_uint_32
905 * macro will fail on top-bit-set values because of the sign extension.
906 */
907 #define PNG_CHUNK_FROM_STRING(s)\
908 PNG_U32(0xff & (s)[0], 0xff & (s)[1], 0xff & (s)[2], 0xff & (s)[3])
909
910 /* This uses (char), not (png_byte) to avoid warnings on systems where (char) is
911 * signed and the argument is a (char[]) This macro will fail miserably on
912 * systems where (char) is more than 8 bits.
913 */
914 #define PNG_STRING_FROM_CHUNK(s,c)\
915 (void)(((char*)(s))[0]=(char)(((c)>>24) & 0xff), \
916 ((char*)(s))[1]=(char)(((c)>>16) & 0xff),\
917 ((char*)(s))[2]=(char)(((c)>>8) & 0xff), \
918 ((char*)(s))[3]=(char)((c & 0xff)))
919
920 /* Do the same but terminate with a null character. */
921 #define PNG_CSTRING_FROM_CHUNK(s,c)\
922 (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0)
923
924 /* Test on flag values as defined in the spec (section 5.4): */
925 #define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29))
926 #define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c))
927 #define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21))
928 #define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13))
929 #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5))
930
931 /* Gamma values (new at libpng-1.5.4): */
932 #define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */
933 #define PNG_GAMMA_MAC_INVERSE 65909
934 #define PNG_GAMMA_sRGB_INVERSE 45455
935
936 /* Almost everything below is C specific; the #defines above can be used in
937 * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot.
938 */
939 #ifndef PNG_VERSION_INFO_ONLY
940
941 #include "pngstruct.h"
942 #include "pnginfo.h"
943
944 /* Validate the include paths - the include path used to generate pnglibconf.h
945 * must match that used in the build, or we must be using pnglibconf.h.prebuilt:
946 */
947 #if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM
948 # error ZLIB_VERNUM != PNG_ZLIB_VERNUM \
949 "-I (include path) error: see the notes in pngpriv.h"
950 /* This means that when pnglibconf.h was built the copy of zlib.h that it
951 * used is not the same as the one being used here. Because the build of
952 * libpng makes decisions to use inflateInit2 and inflateReset2 based on the
953 * zlib version number and because this affects handling of certain broken
954 * PNG files the -I directives must match.
955 *
956 * The most likely explanation is that you passed a -I in CFLAGS. This will
957 * not work; all the preprocessor directives and in particular all the -I
958 * directives must be in CPPFLAGS.
959 */
960 #endif
961
962 /* This is used for 16-bit gamma tables -- only the top level pointers are
963 * const; this could be changed:
964 */
965 typedef const png_uint_16p * png_const_uint_16pp;
966
967 /* Added to libpng-1.5.7: sRGB conversion tables */
968 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
969 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
970 #ifdef PNG_SIMPLIFIED_READ_SUPPORTED
971 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]);
972 /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value,
973 * 0..65535. This table gives the closest 16-bit answers (no errors).
974 */
975 #endif
976
977 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]);
978 PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]);
979
980 #define PNG_sRGB_FROM_LINEAR(linear) \
981 ((png_byte)(0xff & ((png_sRGB_base[(linear)>>15] \
982 + ((((linear) & 0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8)))
983 /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB
984 * encoded value with maximum error 0.646365. Note that the input is not a
985 * 16-bit value; it has been multiplied by 255! */
986 #endif /* SIMPLIFIED_READ/WRITE */
987
988
989 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */
990 #ifdef __cplusplus
991 extern "C" {
992 #endif /* __cplusplus */
993
994 /* Internal functions; these are not exported from a DLL however because they
995 * are used within several of the C source files they have to be C extern.
996 *
997 * All of these functions must be declared with PNG_INTERNAL_FUNCTION.
998 */
999
1000 /* Zlib support */
1001 #define PNG_UNEXPECTED_ZLIB_RETURN (-7)
1002 PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret),
1003 PNG_EMPTY);
1004 /* Used by the zlib handling functions to ensure that z_stream::msg is always
1005 * set before they return.
1006 */
1007
1008 #ifdef PNG_WRITE_SUPPORTED
1009 PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr,
1010 png_compression_bufferp *list),PNG_EMPTY);
1011 /* Free the buffer list used by the compressed write code. */
1012 #endif
1013
1014 #if defined(PNG_FLOATING_POINT_SUPPORTED) && \
1015 !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \
1016 (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \
1017 defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \
1018 defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \
1019 (defined(PNG_sCAL_SUPPORTED) && \
1020 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED))
1021 PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr,
1022 double fp, png_const_charp text),PNG_EMPTY);
1023 #endif
1024
1025 /* Check the user version string for compatibility, returns false if the version
1026 * numbers aren't compatible.
1027 */
1028 PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr,
1029 png_const_charp user_png_ver),PNG_EMPTY);
1030
1031 /* Internal base allocator - no messages, NULL on failure to allocate. This
1032 * does, however, call the application provided allocator and that could call
1033 * png_error (although that would be a bug in the application implementation.)
1034 */
1035 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr,
1036 png_alloc_size_t size),PNG_ALLOCATED);
1037
1038 #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\
1039 defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED)
1040 /* Internal array allocator, outputs no error or warning messages on failure,
1041 * just returns NULL.
1042 */
1043 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr,
1044 int nelements, size_t element_size),PNG_ALLOCATED);
1045
1046 /* The same but an existing array is extended by add_elements. This function
1047 * also memsets the new elements to 0 and copies the old elements. The old
1048 * array is not freed or altered.
1049 */
1050 PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr,
1051 png_const_voidp array, int old_elements, int add_elements,
1052 size_t element_size),PNG_ALLOCATED);
1053 #endif /* text, sPLT or unknown chunks */
1054
1055 /* Magic to create a struct when there is no struct to call the user supplied
1056 * memory allocators. Because error handling has not been set up the memory
1057 * handlers can't safely call png_error, but this is an obscure and undocumented
1058 * restriction so libpng has to assume that the 'free' handler, at least, might
1059 * call png_error.
1060 */
1061 PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct,
1062 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
1063 png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn,
1064 png_free_ptr free_fn),PNG_ALLOCATED);
1065
1066 /* Free memory from internal libpng struct */
1067 PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr),
1068 PNG_EMPTY);
1069
1070 /* Free an allocated jmp_buf (always succeeds) */
1071 PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY);
1072
1073 /* Function to allocate memory for zlib. PNGAPI is disallowed. */
1074 PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size),
1075 PNG_ALLOCATED);
1076
1077 /* Function to free memory for zlib. PNGAPI is disallowed. */
1078 PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY);
1079
1080 /* Next four functions are used internally as callbacks. PNGCBAPI is required
1081 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to
1082 * PNGCBAPI at 1.5.0
1083 */
1084
1085 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr,
1086 png_bytep data, size_t length),PNG_EMPTY);
1087
1088 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1089 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr,
1090 png_bytep buffer, size_t length),PNG_EMPTY);
1091 #endif
1092
1093 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr,
1094 png_bytep data, size_t length),PNG_EMPTY);
1095
1096 #ifdef PNG_WRITE_FLUSH_SUPPORTED
1097 # ifdef PNG_STDIO_SUPPORTED
1098 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr),
1099 PNG_EMPTY);
1100 # endif
1101 #endif
1102
1103 /* Reset the CRC variable */
1104 PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY);
1105
1106 /* Write the "data" buffer to whatever output you are using */
1107 PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr,
1108 png_const_bytep data, size_t length),PNG_EMPTY);
1109
1110 /* Read and check the PNG file signature */
1111 PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr,
1112 png_inforp info_ptr),PNG_EMPTY);
1113
1114 /* Read the chunk header (length + type name) */
1115 PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr),
1116 PNG_EMPTY);
1117
1118 /* Read data from whatever input you are using into the "data" buffer */
1119 PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data,
1120 size_t length),PNG_EMPTY);
1121
1122 /* Read bytes into buf, and update png_ptr->crc */
1123 PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf,
1124 png_uint_32 length),PNG_EMPTY);
1125
1126 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
1127 PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr,
1128 png_uint_32 skip),PNG_EMPTY);
1129
1130 /* Read the CRC from the file and compare it to the libpng calculated CRC */
1131 PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY);
1132
1133 /* Calculate the CRC over a section of data. Note that we are only
1134 * passing a maximum of 64K on systems that have this as a memory limit,
1135 * since this is the maximum buffer size we can specify.
1136 */
1137 PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr,
1138 png_const_bytep ptr, size_t length),PNG_EMPTY);
1139
1140 #ifdef PNG_WRITE_FLUSH_SUPPORTED
1141 PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY);
1142 #endif
1143
1144 /* Write various chunks */
1145
1146 /* Write the IHDR chunk, and update the png_struct with the necessary
1147 * information.
1148 */
1149 PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr,
1150 png_uint_32 width, png_uint_32 height, int bit_depth, int color_type,
1151 int compression_method, int filter_method, int interlace_method),PNG_EMPTY);
1152
1153 PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr,
1154 png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY);
1155
1156 PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr,
1157 png_const_bytep row_data, png_alloc_size_t row_data_length, int flush),
1158 PNG_EMPTY);
1159
1160 PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY);
1161
1162 #ifdef PNG_WRITE_gAMA_SUPPORTED
1163 PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr,
1164 png_fixed_point file_gamma),PNG_EMPTY);
1165 #endif
1166
1167 #ifdef PNG_WRITE_sBIT_SUPPORTED
1168 PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr,
1169 png_const_color_8p sbit, int color_type),PNG_EMPTY);
1170 #endif
1171
1172 #ifdef PNG_WRITE_cHRM_SUPPORTED
1173 PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr,
1174 const png_xy *xy), PNG_EMPTY);
1175 /* The xy value must have been previously validated */
1176 #endif
1177
1178 #ifdef PNG_WRITE_sRGB_SUPPORTED
1179 PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr,
1180 int intent),PNG_EMPTY);
1181 #endif
1182
1183 #ifdef PNG_WRITE_eXIf_SUPPORTED
1184 PNG_INTERNAL_FUNCTION(void,png_write_eXIf,(png_structrp png_ptr,
1185 png_bytep exif, int num_exif),PNG_EMPTY);
1186 #endif
1187
1188 #ifdef PNG_WRITE_iCCP_SUPPORTED
1189 PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr,
1190 png_const_charp name, png_const_bytep profile), PNG_EMPTY);
1191 /* The profile must have been previously validated for correctness, the
1192 * length comes from the first four bytes. Only the base, deflate,
1193 * compression is supported.
1194 */
1195 #endif
1196
1197 #ifdef PNG_WRITE_sPLT_SUPPORTED
1198 PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr,
1199 png_const_sPLT_tp palette),PNG_EMPTY);
1200 #endif
1201
1202 #ifdef PNG_WRITE_tRNS_SUPPORTED
1203 PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr,
1204 png_const_bytep trans, png_const_color_16p values, int number,
1205 int color_type),PNG_EMPTY);
1206 #endif
1207
1208 #ifdef PNG_WRITE_bKGD_SUPPORTED
1209 PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr,
1210 png_const_color_16p values, int color_type),PNG_EMPTY);
1211 #endif
1212
1213 #ifdef PNG_WRITE_hIST_SUPPORTED
1214 PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr,
1215 png_const_uint_16p hist, int num_hist),PNG_EMPTY);
1216 #endif
1217
1218 /* Chunks that have keywords */
1219 #ifdef PNG_WRITE_tEXt_SUPPORTED
1220 PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr,
1221 png_const_charp key, png_const_charp text, size_t text_len),PNG_EMPTY);
1222 #endif
1223
1224 #ifdef PNG_WRITE_zTXt_SUPPORTED
1225 PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp
1226 key, png_const_charp text, int compression),PNG_EMPTY);
1227 #endif
1228
1229 #ifdef PNG_WRITE_iTXt_SUPPORTED
1230 PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr,
1231 int compression, png_const_charp key, png_const_charp lang,
1232 png_const_charp lang_key, png_const_charp text),PNG_EMPTY);
1233 #endif
1234
1235 #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */
1236 PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr,
1237 png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY);
1238 #endif
1239
1240 #ifdef PNG_WRITE_oFFs_SUPPORTED
1241 PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr,
1242 png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY);
1243 #endif
1244
1245 #ifdef PNG_WRITE_pCAL_SUPPORTED
1246 PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr,
1247 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
1248 png_const_charp units, png_charpp params),PNG_EMPTY);
1249 #endif
1250
1251 #ifdef PNG_WRITE_pHYs_SUPPORTED
1252 PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr,
1253 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
1254 int unit_type),PNG_EMPTY);
1255 #endif
1256
1257 #ifdef PNG_WRITE_tIME_SUPPORTED
1258 PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr,
1259 png_const_timep mod_time),PNG_EMPTY);
1260 #endif
1261
1262 #ifdef PNG_WRITE_sCAL_SUPPORTED
1263 PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr,
1264 int unit, png_const_charp width, png_const_charp height),PNG_EMPTY);
1265 #endif
1266
1267 /* Called when finished processing a row of data */
1268 PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr),
1269 PNG_EMPTY);
1270
1271 /* Internal use only. Called before first row of data */
1272 PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr),
1273 PNG_EMPTY);
1274
1275 /* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an
1276 * array of png_ptr->width pixels. If the image is not interlaced or this
1277 * is the final pass this just does a memcpy, otherwise the "display" flag
1278 * is used to determine whether to copy pixels that are not in the current pass.
1279 *
1280 * Because 'png_do_read_interlace' (below) replicates pixels this allows this
1281 * function to achieve the documented 'blocky' appearance during interlaced read
1282 * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row'
1283 * are not changed if they are not in the current pass, when display is 0.
1284 *
1285 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless.
1286 *
1287 * The API always reads from the png_struct row buffer and always assumes that
1288 * it is full width (png_do_read_interlace has already been called.)
1289 *
1290 * This function is only ever used to write to row buffers provided by the
1291 * caller of the relevant libpng API and the row must have already been
1292 * transformed by the read transformations.
1293 *
1294 * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed
1295 * bitmasks for use within the code, otherwise runtime generated masks are used.
1296 * The default is compile time masks.
1297 */
1298 #ifndef PNG_USE_COMPILE_TIME_MASKS
1299 # define PNG_USE_COMPILE_TIME_MASKS 1
1300 #endif
1301 PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr,
1302 png_bytep row, int display),PNG_EMPTY);
1303
1304 #ifdef PNG_READ_INTERLACING_SUPPORTED
1305 /* Expand an interlaced row: the 'row_info' describes the pass data that has
1306 * been read in and must correspond to the pixels in 'row', the pixels are
1307 * expanded (moved apart) in 'row' to match the final layout, when doing this
1308 * the pixels are *replicated* to the intervening space. This is essential for
1309 * the correct operation of png_combine_row, above.
1310 */
1311 PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info,
1312 png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY);
1313 #endif
1314
1315 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
1316
1317 #ifdef PNG_WRITE_INTERLACING_SUPPORTED
1318 /* Grab pixels out of a row for an interlaced pass */
1319 PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info,
1320 png_bytep row, int pass),PNG_EMPTY);
1321 #endif
1322
1323 /* Unfilter a row: check the filter value before calling this, there is no point
1324 * calling it for PNG_FILTER_VALUE_NONE.
1325 */
1326 PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop
1327 row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY);
1328
1329 #if PNG_ARM_NEON_OPT > 0
1330 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info,
1331 png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1332 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop
1333 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1334 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop
1335 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1336 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop
1337 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1338 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop
1339 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1340 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(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_paeth4_neon,(png_row_infop
1343 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1344 #endif
1345
1346 #if PNG_MIPS_MSA_OPT > 0
1347 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_msa,(png_row_infop row_info,
1348 png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1349 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_msa,(png_row_infop
1350 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1351 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_msa,(png_row_infop
1352 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1353 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_msa,(png_row_infop
1354 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1355 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_msa,(png_row_infop
1356 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1357 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_msa,(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_paeth4_msa,(png_row_infop
1360 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1361 #endif
1362
1363 #if PNG_POWERPC_VSX_OPT > 0
1364 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_vsx,(png_row_infop row_info,
1365 png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1366 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_vsx,(png_row_infop
1367 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1368 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_vsx,(png_row_infop
1369 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1370 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_vsx,(png_row_infop
1371 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1372 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_vsx,(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_paeth3_vsx,(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_paeth4_vsx,(png_row_infop
1377 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1378 #endif
1379
1380 #if PNG_INTEL_SSE_IMPLEMENTATION > 0
1381 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_sse2,(png_row_infop
1382 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1383 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_sse2,(png_row_infop
1384 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1385 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_sse2,(png_row_infop
1386 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1387 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_sse2,(png_row_infop
1388 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1389 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_sse2,(png_row_infop
1390 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1391 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_sse2,(png_row_infop
1392 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1393 #endif
1394
1395 /* Choose the best filter to use and filter the row data */
1396 PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr,
1397 png_row_infop row_info),PNG_EMPTY);
1398
1399 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1400 PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr,
1401 png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY);
1402 /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer
1403 * is NULL the function checks, instead, for the end of the stream. In this
1404 * case a benign error will be issued if the stream end is not found or if
1405 * extra data has to be consumed.
1406 */
1407 PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr),
1408 PNG_EMPTY);
1409 /* This cleans up when the IDAT LZ stream does not end when the last image
1410 * byte is read; there is still some pending input.
1411 */
1412
1413 PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr),
1414 PNG_EMPTY);
1415 /* Finish a row while reading, dealing with interlacing passes, etc. */
1416 #endif /* SEQUENTIAL_READ */
1417
1418 /* Initialize the row buffers, etc. */
1419 PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY);
1420
1421 #if ZLIB_VERNUM >= 0x1240
1422 PNG_INTERNAL_FUNCTION(int,png_zlib_inflate,(png_structrp png_ptr, int flush),
1423 PNG_EMPTY);
1424 # define PNG_INFLATE(pp, flush) png_zlib_inflate(pp, flush)
1425 #else /* Zlib < 1.2.4 */
1426 # define PNG_INFLATE(pp, flush) inflate(&(pp)->zstream, flush)
1427 #endif /* Zlib < 1.2.4 */
1428
1429 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
1430 /* Optional call to update the users info structure */
1431 PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr,
1432 png_inforp info_ptr),PNG_EMPTY);
1433 #endif
1434
1435 /* Shared transform functions, defined in pngtran.c */
1436 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
1437 defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
1438 PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info,
1439 png_bytep row, int at_start),PNG_EMPTY);
1440 #endif
1441
1442 #ifdef PNG_16BIT_SUPPORTED
1443 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
1444 PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info,
1445 png_bytep row),PNG_EMPTY);
1446 #endif
1447 #endif
1448
1449 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
1450 defined(PNG_WRITE_PACKSWAP_SUPPORTED)
1451 PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info,
1452 png_bytep row),PNG_EMPTY);
1453 #endif
1454
1455 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
1456 PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info,
1457 png_bytep row),PNG_EMPTY);
1458 #endif
1459
1460 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
1461 PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info,
1462 png_bytep row),PNG_EMPTY);
1463 #endif
1464
1465 /* The following decodes the appropriate chunks, and does error correction,
1466 * then calls the appropriate callback for the chunk if it is valid.
1467 */
1468
1469 /* Decode the IHDR chunk */
1470 PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr,
1471 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1472 PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr,
1473 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1474 PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr,
1475 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1476
1477 #ifdef PNG_READ_bKGD_SUPPORTED
1478 PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr,
1479 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1480 #endif
1481
1482 #ifdef PNG_READ_cHRM_SUPPORTED
1483 PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr,
1484 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1485 #endif
1486
1487 #ifdef PNG_READ_eXIf_SUPPORTED
1488 PNG_INTERNAL_FUNCTION(void,png_handle_eXIf,(png_structrp png_ptr,
1489 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1490 #endif
1491
1492 #ifdef PNG_READ_gAMA_SUPPORTED
1493 PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr,
1494 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1495 #endif
1496
1497 #ifdef PNG_READ_hIST_SUPPORTED
1498 PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr,
1499 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1500 #endif
1501
1502 #ifdef PNG_READ_iCCP_SUPPORTED
1503 PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr,
1504 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1505 #endif /* READ_iCCP */
1506
1507 #ifdef PNG_READ_iTXt_SUPPORTED
1508 PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr,
1509 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1510 #endif
1511
1512 #ifdef PNG_READ_oFFs_SUPPORTED
1513 PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr,
1514 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1515 #endif
1516
1517 #ifdef PNG_READ_pCAL_SUPPORTED
1518 PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr,
1519 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1520 #endif
1521
1522 #ifdef PNG_READ_pHYs_SUPPORTED
1523 PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr,
1524 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1525 #endif
1526
1527 #ifdef PNG_READ_sBIT_SUPPORTED
1528 PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr,
1529 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1530 #endif
1531
1532 #ifdef PNG_READ_sCAL_SUPPORTED
1533 PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr,
1534 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1535 #endif
1536
1537 #ifdef PNG_READ_sPLT_SUPPORTED
1538 PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr,
1539 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1540 #endif /* READ_sPLT */
1541
1542 #ifdef PNG_READ_sRGB_SUPPORTED
1543 PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr,
1544 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1545 #endif
1546
1547 #ifdef PNG_READ_tEXt_SUPPORTED
1548 PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr,
1549 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1550 #endif
1551
1552 #ifdef PNG_READ_tIME_SUPPORTED
1553 PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr,
1554 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1555 #endif
1556
1557 #ifdef PNG_READ_tRNS_SUPPORTED
1558 PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr,
1559 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1560 #endif
1561
1562 #ifdef PNG_READ_zTXt_SUPPORTED
1563 PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr,
1564 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1565 #endif
1566
1567 PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_const_structrp png_ptr,
1568 png_uint_32 chunk_name),PNG_EMPTY);
1569
1570 PNG_INTERNAL_FUNCTION(void,png_check_chunk_length,(png_const_structrp png_ptr,
1571 png_uint_32 chunk_length),PNG_EMPTY);
1572
1573 PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr,
1574 png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY);
1575 /* This is the function that gets called for unknown chunks. The 'keep'
1576 * argument is either non-zero for a known chunk that has been set to be
1577 * handled as unknown or zero for an unknown chunk. By default the function
1578 * just skips the chunk or errors out if it is critical.
1579 */
1580
1581 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\
1582 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
1583 PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling,
1584 (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY);
1585 /* Exactly as the API png_handle_as_unknown() except that the argument is a
1586 * 32-bit chunk name, not a string.
1587 */
1588 #endif /* READ_UNKNOWN_CHUNKS || HANDLE_AS_UNKNOWN */
1589
1590 /* Handle the transformations for reading and writing */
1591 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
1592 PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr,
1593 png_row_infop row_info),PNG_EMPTY);
1594 #endif
1595 #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
1596 PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr,
1597 png_row_infop row_info),PNG_EMPTY);
1598 #endif
1599
1600 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
1601 PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr),
1602 PNG_EMPTY);
1603 #endif
1604
1605 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1606 PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr,
1607 png_inforp info_ptr),PNG_EMPTY);
1608 PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr,
1609 png_inforp info_ptr),PNG_EMPTY);
1610 PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY);
1611 PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr),
1612 PNG_EMPTY);
1613 PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr,
1614 png_bytep buffer, size_t buffer_length),PNG_EMPTY);
1615 PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY);
1616 PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr,
1617 png_bytep buffer, size_t buffer_length),PNG_EMPTY);
1618 PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr),
1619 PNG_EMPTY);
1620 PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr,
1621 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1622 PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr,
1623 png_inforp info_ptr),PNG_EMPTY);
1624 PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr,
1625 png_inforp info_ptr),PNG_EMPTY);
1626 PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr,
1627 png_bytep row),PNG_EMPTY);
1628 PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr,
1629 png_inforp info_ptr),PNG_EMPTY);
1630 PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr,
1631 png_inforp info_ptr),PNG_EMPTY);
1632 PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr),
1633 PNG_EMPTY);
1634 # ifdef PNG_READ_tEXt_SUPPORTED
1635 PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr,
1636 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1637 PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr,
1638 png_inforp info_ptr),PNG_EMPTY);
1639 # endif
1640 # ifdef PNG_READ_zTXt_SUPPORTED
1641 PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr,
1642 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1643 PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr,
1644 png_inforp info_ptr),PNG_EMPTY);
1645 # endif
1646 # ifdef PNG_READ_iTXt_SUPPORTED
1647 PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr,
1648 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1649 PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr,
1650 png_inforp info_ptr),PNG_EMPTY);
1651 # endif
1652
1653 #endif /* PROGRESSIVE_READ */
1654
1655 /* Added at libpng version 1.6.0 */
1656 #ifdef PNG_GAMMA_SUPPORTED
1657 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr,
1658 png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY);
1659 /* Set the colorspace gamma with a value provided by the application or by
1660 * the gAMA chunk on read. The value will override anything set by an ICC
1661 * profile.
1662 */
1663
1664 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr,
1665 png_inforp info_ptr), PNG_EMPTY);
1666 /* Synchronize the info 'valid' flags with the colorspace */
1667
1668 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr,
1669 png_inforp info_ptr), PNG_EMPTY);
1670 /* Copy the png_struct colorspace to the info_struct and call the above to
1671 * synchronize the flags. Checks for NULL info_ptr and does nothing.
1672 */
1673 #endif
1674
1675 /* Added at libpng version 1.4.0 */
1676 #ifdef PNG_COLORSPACE_SUPPORTED
1677 /* These internal functions are for maintaining the colorspace structure within
1678 * a png_info or png_struct (or, indeed, both).
1679 */
1680 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities,
1681 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy,
1682 int preferred), PNG_EMPTY);
1683
1684 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints,
1685 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ,
1686 int preferred), PNG_EMPTY);
1687
1688 #ifdef PNG_sRGB_SUPPORTED
1689 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr,
1690 png_colorspacerp colorspace, int intent), PNG_EMPTY);
1691 /* This does set the colorspace gAMA and cHRM values too, but doesn't set the
1692 * flags to write them, if it returns false there was a problem and an error
1693 * message has already been output (but the colorspace may still need to be
1694 * synced to record the invalid flag).
1695 */
1696 #endif /* sRGB */
1697
1698 #ifdef PNG_iCCP_SUPPORTED
1699 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr,
1700 png_colorspacerp colorspace, png_const_charp name,
1701 png_uint_32 profile_length, png_const_bytep profile, int color_type),
1702 PNG_EMPTY);
1703 /* The 'name' is used for information only */
1704
1705 /* Routines for checking parts of an ICC profile. */
1706 #ifdef PNG_READ_iCCP_SUPPORTED
1707 PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr,
1708 png_colorspacerp colorspace, png_const_charp name,
1709 png_uint_32 profile_length), PNG_EMPTY);
1710 #endif /* READ_iCCP */
1711 PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr,
1712 png_colorspacerp colorspace, png_const_charp name,
1713 png_uint_32 profile_length,
1714 png_const_bytep profile /* first 132 bytes only */, int color_type),
1715 PNG_EMPTY);
1716 PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr,
1717 png_colorspacerp colorspace, png_const_charp name,
1718 png_uint_32 profile_length,
1719 png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY);
1720 #ifdef PNG_sRGB_SUPPORTED
1721 PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,(
1722 png_const_structrp png_ptr, png_colorspacerp colorspace,
1723 png_const_bytep profile, uLong adler), PNG_EMPTY);
1724 /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may
1725 * be zero to indicate that it is not available. It is used, if provided,
1726 * as a fast check on the profile when checking to see if it is sRGB.
1727 */
1728 #endif
1729 #endif /* iCCP */
1730
1731 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
1732 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients,
1733 (png_structrp png_ptr), PNG_EMPTY);
1734 /* Set the rgb_to_gray coefficients from the colorspace Y values */
1735 #endif /* READ_RGB_TO_GRAY */
1736 #endif /* COLORSPACE */
1737
1738 /* Added at libpng version 1.4.0 */
1739 PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr,
1740 png_uint_32 width, png_uint_32 height, int bit_depth,
1741 int color_type, int interlace_type, int compression_type,
1742 int filter_type),PNG_EMPTY);
1743
1744 /* Added at libpng version 1.5.10 */
1745 #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \
1746 defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED)
1747 PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes,
1748 (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY);
1749 #endif
1750
1751 #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
1752 PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr,
1753 png_const_charp name),PNG_NORETURN);
1754 #endif
1755
1756 /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite
1757 * the end. Always leaves the buffer nul terminated. Never errors out (and
1758 * there is no error code.)
1759 */
1760 PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize,
1761 size_t pos, png_const_charp string),PNG_EMPTY);
1762
1763 /* Various internal functions to handle formatted warning messages, currently
1764 * only implemented for warnings.
1765 */
1766 #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)
1767 /* Utility to dump an unsigned value into a buffer, given a start pointer and
1768 * and end pointer (which should point just *beyond* the end of the buffer!)
1769 * Returns the pointer to the start of the formatted string. This utility only
1770 * does unsigned values.
1771 */
1772 PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start,
1773 png_charp end, int format, png_alloc_size_t number),PNG_EMPTY);
1774
1775 /* Convenience macro that takes an array: */
1776 #define PNG_FORMAT_NUMBER(buffer,format,number) \
1777 png_format_number(buffer, buffer + (sizeof buffer), format, number)
1778
1779 /* Suggested size for a number buffer (enough for 64 bits and a sign!) */
1780 #define PNG_NUMBER_BUFFER_SIZE 24
1781
1782 /* These are the integer formats currently supported, the name is formed from
1783 * the standard printf(3) format string.
1784 */
1785 #define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */
1786 #define PNG_NUMBER_FORMAT_02u 2
1787 #define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */
1788 #define PNG_NUMBER_FORMAT_02d 2
1789 #define PNG_NUMBER_FORMAT_x 3
1790 #define PNG_NUMBER_FORMAT_02x 4
1791 #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */
1792 #endif
1793
1794 #ifdef PNG_WARNINGS_SUPPORTED
1795 /* New defines and members adding in libpng-1.5.4 */
1796 # define PNG_WARNING_PARAMETER_SIZE 32
1797 # define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */
1798
1799 /* An l-value of this type has to be passed to the APIs below to cache the
1800 * values of the parameters to a formatted warning message.
1801 */
1802 typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][
1803 PNG_WARNING_PARAMETER_SIZE];
1804
1805 PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p,
1806 int number, png_const_charp string),PNG_EMPTY);
1807 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters,
1808 * including the trailing '\0'.
1809 */
1810 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned,
1811 (png_warning_parameters p, int number, int format, png_alloc_size_t value),
1812 PNG_EMPTY);
1813 /* Use png_alloc_size_t because it is an unsigned type as big as any we
1814 * need to output. Use the following for a signed value.
1815 */
1816 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed,
1817 (png_warning_parameters p, int number, int format, png_int_32 value),
1818 PNG_EMPTY);
1819
1820 PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr,
1821 png_warning_parameters p, png_const_charp message),PNG_EMPTY);
1822 /* 'message' follows the X/Open approach of using @1, @2 to insert
1823 * parameters previously supplied using the above functions. Errors in
1824 * specifying the parameters will simply result in garbage substitutions.
1825 */
1826 #endif
1827
1828 #ifdef PNG_BENIGN_ERRORS_SUPPORTED
1829 /* Application errors (new in 1.6); use these functions (declared below) for
1830 * errors in the parameters or order of API function calls on read. The
1831 * 'warning' should be used for an error that can be handled completely; the
1832 * 'error' for one which can be handled safely but which may lose application
1833 * information or settings.
1834 *
1835 * By default these both result in a png_error call prior to release, while in a
1836 * released version the 'warning' is just a warning. However if the application
1837 * explicitly disables benign errors (explicitly permitting the code to lose
1838 * information) they both turn into warnings.
1839 *
1840 * If benign errors aren't supported they end up as the corresponding base call
1841 * (png_warning or png_error.)
1842 */
1843 PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr,
1844 png_const_charp message),PNG_EMPTY);
1845 /* The application provided invalid parameters to an API function or called
1846 * an API function at the wrong time, libpng can completely recover.
1847 */
1848
1849 PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr,
1850 png_const_charp message),PNG_EMPTY);
1851 /* As above but libpng will ignore the call, or attempt some other partial
1852 * recovery from the error.
1853 */
1854 #else
1855 # define png_app_warning(pp,s) png_warning(pp,s)
1856 # define png_app_error(pp,s) png_error(pp,s)
1857 #endif
1858
1859 PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr,
1860 png_const_charp message, int error),PNG_EMPTY);
1861 /* Report a recoverable issue in chunk data. On read this is used to report
1862 * a problem found while reading a particular chunk and the
1863 * png_chunk_benign_error or png_chunk_warning function is used as
1864 * appropriate. On write this is used to report an error that comes from
1865 * data set via an application call to a png_set_ API and png_app_error or
1866 * png_app_warning is used as appropriate.
1867 *
1868 * The 'error' parameter must have one of the following values:
1869 */
1870 #define PNG_CHUNK_WARNING 0 /* never an error */
1871 #define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */
1872 #define PNG_CHUNK_ERROR 2 /* always an error */
1873
1874 /* ASCII to FP interfaces, currently only implemented if sCAL
1875 * support is required.
1876 */
1877 #if defined(PNG_sCAL_SUPPORTED)
1878 /* MAX_DIGITS is actually the maximum number of characters in an sCAL
1879 * width or height, derived from the precision (number of significant
1880 * digits - a build time settable option) and assumptions about the
1881 * maximum ridiculous exponent.
1882 */
1883 #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/)
1884
1885 #ifdef PNG_FLOATING_POINT_SUPPORTED
1886 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr,
1887 png_charp ascii, size_t size, double fp, unsigned int precision),
1888 PNG_EMPTY);
1889 #endif /* FLOATING_POINT */
1890
1891 #ifdef PNG_FIXED_POINT_SUPPORTED
1892 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr,
1893 png_charp ascii, size_t size, png_fixed_point fp),PNG_EMPTY);
1894 #endif /* FIXED_POINT */
1895 #endif /* sCAL */
1896
1897 #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED)
1898 /* An internal API to validate the format of a floating point number.
1899 * The result is the index of the next character. If the number is
1900 * not valid it will be the index of a character in the supposed number.
1901 *
1902 * The format of a number is defined in the PNG extensions specification
1903 * and this API is strictly conformant to that spec, not anyone elses!
1904 *
1905 * The format as a regular expression is:
1906 *
1907 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)?
1908 *
1909 * or:
1910 *
1911 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)?
1912 *
1913 * The complexity is that either integer or fraction must be present and the
1914 * fraction is permitted to have no digits only if the integer is present.
1915 *
1916 * NOTE: The dangling E problem.
1917 * There is a PNG valid floating point number in the following:
1918 *
1919 * PNG floating point numbers are not greedy.
1920 *
1921 * Working this out requires *TWO* character lookahead (because of the
1922 * sign), the parser does not do this - it will fail at the 'r' - this
1923 * doesn't matter for PNG sCAL chunk values, but it requires more care
1924 * if the value were ever to be embedded in something more complex. Use
1925 * ANSI-C strtod if you need the lookahead.
1926 */
1927 /* State table for the parser. */
1928 #define PNG_FP_INTEGER 0 /* before or in integer */
1929 #define PNG_FP_FRACTION 1 /* before or in fraction */
1930 #define PNG_FP_EXPONENT 2 /* before or in exponent */
1931 #define PNG_FP_STATE 3 /* mask for the above */
1932 #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */
1933 #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */
1934 #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */
1935 #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */
1936 #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */
1937
1938 /* These three values don't affect the parser. They are set but not used.
1939 */
1940 #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */
1941 #define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */
1942 #define PNG_FP_NONZERO 256 /* A non-zero value */
1943 #define PNG_FP_STICKY 448 /* The above three flags */
1944
1945 /* This is available for the caller to store in 'state' if required. Do not
1946 * call the parser after setting it (the parser sometimes clears it.)
1947 */
1948 #define PNG_FP_INVALID 512 /* Available for callers as a distinct value */
1949
1950 /* Result codes for the parser (boolean - true meants ok, false means
1951 * not ok yet.)
1952 */
1953 #define PNG_FP_MAYBE 0 /* The number may be valid in the future */
1954 #define PNG_FP_OK 1 /* The number is valid */
1955
1956 /* Tests on the sticky non-zero and negative flags. To pass these checks
1957 * the state must also indicate that the whole number is valid - this is
1958 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this
1959 * is equivalent to PNG_FP_OK above.)
1960 */
1961 #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO)
1962 /* NZ_MASK: the string is valid and a non-zero negative value */
1963 #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO)
1964 /* Z MASK: the string is valid and a non-zero value. */
1965 /* PNG_FP_SAW_DIGIT: the string is valid. */
1966 #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT)
1967 #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK)
1968 #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK)
1969
1970 /* The actual parser. This can be called repeatedly. It updates
1971 * the index into the string and the state variable (which must
1972 * be initialized to 0). It returns a result code, as above. There
1973 * is no point calling the parser any more if it fails to advance to
1974 * the end of the string - it is stuck on an invalid character (or
1975 * terminated by '\0').
1976 *
1977 * Note that the pointer will consume an E or even an E+ and then leave
1978 * a 'maybe' state even though a preceding integer.fraction is valid.
1979 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was
1980 * a valid number. It's possible to recover from this by calling
1981 * the parser again (from the start, with state 0) but with a string
1982 * that omits the last character (i.e. set the size to the index of
1983 * the problem character.) This has not been tested within libpng.
1984 */
1985 PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string,
1986 size_t size, int *statep, png_size_tp whereami),PNG_EMPTY);
1987
1988 /* This is the same but it checks a complete string and returns true
1989 * only if it just contains a floating point number. As of 1.5.4 this
1990 * function also returns the state at the end of parsing the number if
1991 * it was valid (otherwise it returns 0.) This can be used for testing
1992 * for negative or zero values using the sticky flag.
1993 */
1994 PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string,
1995 size_t size),PNG_EMPTY);
1996 #endif /* pCAL || sCAL */
1997
1998 #if defined(PNG_GAMMA_SUPPORTED) ||\
1999 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED)
2000 /* Added at libpng version 1.5.0 */
2001 /* This is a utility to provide a*times/div (rounded) and indicate
2002 * if there is an overflow. The result is a boolean - false (0)
2003 * for overflow, true (1) if no overflow, in which case *res
2004 * holds the result.
2005 */
2006 PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a,
2007 png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY);
2008 #endif
2009
2010 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED)
2011 /* Same deal, but issue a warning on overflow and return 0. */
2012 PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn,
2013 (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by,
2014 png_int_32 divided_by),PNG_EMPTY);
2015 #endif
2016
2017 #ifdef PNG_GAMMA_SUPPORTED
2018 /* Calculate a reciprocal - used for gamma values. This returns
2019 * 0 if the argument is 0 in order to maintain an undefined value;
2020 * there are no warnings.
2021 */
2022 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a),
2023 PNG_EMPTY);
2024
2025 #ifdef PNG_READ_GAMMA_SUPPORTED
2026 /* The same but gives a reciprocal of the product of two fixed point
2027 * values. Accuracy is suitable for gamma calculations but this is
2028 * not exact - use png_muldiv for that. Only required at present on read.
2029 */
2030 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a,
2031 png_fixed_point b),PNG_EMPTY);
2032 #endif
2033
2034 /* Return true if the gamma value is significantly different from 1.0 */
2035 PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value),
2036 PNG_EMPTY);
2037 #endif
2038
2039 #ifdef PNG_READ_GAMMA_SUPPORTED
2040 /* Internal fixed point gamma correction. These APIs are called as
2041 * required to convert single values - they don't need to be fast,
2042 * they are not used when processing image pixel values.
2043 *
2044 * While the input is an 'unsigned' value it must actually be the
2045 * correct bit value - 0..255 or 0..65535 as required.
2046 */
2047 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr,
2048 unsigned int value, png_fixed_point gamma_value),PNG_EMPTY);
2049 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value,
2050 png_fixed_point gamma_value),PNG_EMPTY);
2051 PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value,
2052 png_fixed_point gamma_value),PNG_EMPTY);
2053 PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr),
2054 PNG_EMPTY);
2055 PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr,
2056 int bit_depth),PNG_EMPTY);
2057 #endif
2058
2059 /* SIMPLIFIED READ/WRITE SUPPORT */
2060 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
2061 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
2062 /* The internal structure that png_image::opaque points to. */
2063 typedef struct png_control
2064 {
2065 png_structp png_ptr;
2066 png_infop info_ptr;
2067 png_voidp error_buf; /* Always a jmp_buf at present. */
2068
2069 png_const_bytep memory; /* Memory buffer. */
2070 size_t size; /* Size of the memory buffer. */
2071
2072 unsigned int for_write :1; /* Otherwise it is a read structure */
2073 unsigned int owned_file :1; /* We own the file in io_ptr */
2074 } png_control;
2075
2076 /* Return the pointer to the jmp_buf from a png_control: necessary because C
2077 * does not reveal the type of the elements of jmp_buf.
2078 */
2079 #ifdef __cplusplus
2080 # define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0])
2081 #else
2082 # define png_control_jmp_buf(pc) ((pc)->error_buf)
2083 #endif
2084
2085 /* Utility to safely execute a piece of libpng code catching and logging any
2086 * errors that might occur. Returns true on success, false on failure (either
2087 * of the function or as a result of a png_error.)
2088 */
2089 PNG_INTERNAL_CALLBACK(void,png_safe_error,(png_structp png_ptr,
2090 png_const_charp error_message),PNG_NORETURN);
2091
2092 #ifdef PNG_WARNINGS_SUPPORTED
2093 PNG_INTERNAL_CALLBACK(void,png_safe_warning,(png_structp png_ptr,
2094 png_const_charp warning_message),PNG_EMPTY);
2095 #else
2096 # define png_safe_warning 0/*dummy argument*/
2097 #endif
2098
2099 PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image,
2100 int (*function)(png_voidp), png_voidp arg),PNG_EMPTY);
2101
2102 /* Utility to log an error; this also cleans up the png_image; the function
2103 * always returns 0 (false).
2104 */
2105 PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image,
2106 png_const_charp error_message),PNG_EMPTY);
2107
2108 #ifndef PNG_SIMPLIFIED_READ_SUPPORTED
2109 /* png_image_free is used by the write code but not exported */
2110 PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY);
2111 #endif /* !SIMPLIFIED_READ */
2112
2113 #endif /* SIMPLIFIED READ/WRITE */
2114
2115 /* These are initialization functions for hardware specific PNG filter
2116 * optimizations; list these here then select the appropriate one at compile
2117 * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined
2118 * the generic code is used.
2119 */
2120 #ifdef PNG_FILTER_OPTIMIZATIONS
2121 PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr,
2122 unsigned int bpp), PNG_EMPTY);
2123 /* Just declare the optimization that will be used */
2124 #else
2125 /* List *all* the possible optimizations here - this branch is required if
2126 * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in
2127 * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing.
2128 */
2129 # if PNG_ARM_NEON_OPT > 0
2130 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon,
2131 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
2132 #endif
2133
2134 #if PNG_MIPS_MSA_OPT > 0
2135 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_msa,
2136 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
2137 #endif
2138
2139 # if PNG_INTEL_SSE_IMPLEMENTATION > 0
2140 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_sse2,
2141 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
2142 # endif
2143 #endif
2144
2145 PNG_INTERNAL_FUNCTION(png_uint_32, png_check_keyword, (png_structrp png_ptr,
2146 png_const_charp key, png_bytep new_key), PNG_EMPTY);
2147
2148 #if PNG_ARM_NEON_IMPLEMENTATION == 1
2149 PNG_INTERNAL_FUNCTION(void,
2150 png_riffle_palette_neon,
2151 (png_structrp),
2152 PNG_EMPTY);
2153 PNG_INTERNAL_FUNCTION(int,
2154 png_do_expand_palette_rgba8_neon,
2155 (png_structrp,
2156 png_row_infop,
2157 png_const_bytep,
2158 const png_bytepp,
2159 const png_bytepp),
2160 PNG_EMPTY);
2161 PNG_INTERNAL_FUNCTION(int,
2162 png_do_expand_palette_rgb8_neon,
2163 (png_structrp,
2164 png_row_infop,
2165 png_const_bytep,
2166 const png_bytepp,
2167 const png_bytepp),
2168 PNG_EMPTY);
2169 #endif
2170
2171 /* Maintainer: Put new private prototypes here ^ */
2172
2173 #include "pngdebug.h"
2174
2175 #ifdef __cplusplus
2176 }
2177 #endif
2178
2179 #endif /* PNG_VERSION_INFO_ONLY */
2180 #endif /* PNGPRIV_H */