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pngpriv.h
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1 
2 /* pngpriv.h - private declarations for use inside libpng
3  *
4  * Copyright (c) 2018-2022 Cosmin Truta
5  * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
6  * Copyright (c) 1996-1997 Andreas Dilger
7  * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
8  *
9  * This code is released under the libpng license.
10  * For conditions of distribution and use, see the disclaimer
11  * and license in png.h
12  */
13 
14 /* The symbols declared in this file (including the functions declared
15  * as extern) are PRIVATE. They are not part of the libpng public
16  * interface, and are not recommended for use by regular applications.
17  * Some of them may become public in the future; others may stay private,
18  * change in an incompatible way, or even disappear.
19  * Although the libpng users are not forbidden to include this header,
20  * they should be well aware of the issues that may arise from doing so.
21  */
22 
23 #ifndef PNGPRIV_H
24 #define PNGPRIV_H
25 
26 /* Feature Test Macros. The following are defined here to ensure that correctly
27  * implemented libraries reveal the APIs libpng needs to build and hide those
28  * that are not needed and potentially damaging to the compilation.
29  *
30  * Feature Test Macros must be defined before any system header is included (see
31  * POSIX 1003.1 2.8.2 "POSIX Symbols."
32  *
33  * These macros only have an effect if the operating system supports either
34  * POSIX 1003.1 or C99, or both. On other operating systems (particularly
35  * Windows/Visual Studio) there is no effect; the OS specific tests below are
36  * still required (as of 2011-05-02.)
37  */
38 #ifndef _POSIX_SOURCE
39 # define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */
40 #endif
41 
42 #ifndef PNG_VERSION_INFO_ONLY
43 /* Standard library headers not required by png.h: */
44 # include <stdlib.h>
45 # include <string.h>
46 #endif
47 
48 #define PNGLIB_BUILD /*libpng is being built, not used*/
49 
50 /* If HAVE_CONFIG_H is defined during the build then the build system must
51  * provide an appropriate "config.h" file on the include path. The header file
52  * must provide definitions as required below (search for "HAVE_CONFIG_H");
53  * see configure.ac for more details of the requirements. The macro
54  * "PNG_NO_CONFIG_H" is provided for maintainers to test for dependencies on
55  * 'configure'; define this macro to prevent the configure build including the
56  * configure generated config.h. Libpng is expected to compile without *any*
57  * special build system support on a reasonably ANSI-C compliant system.
58  */
59 #if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H)
60 # include <config.h>
61 
62  /* Pick up the definition of 'restrict' from config.h if it was read: */
63 # define PNG_RESTRICT restrict
64 #endif
65 
66 /* To support symbol prefixing it is necessary to know *before* including png.h
67  * whether the fixed point (and maybe other) APIs are exported, because if they
68  * are not internal definitions may be required. This is handled below just
69  * before png.h is included, but load the configuration now if it is available.
70  */
71 #ifndef PNGLCONF_H
72 # include "pnglibconf.h"
73 #endif
74 
75 /* Local renames may change non-exported API functions from png.h */
76 #if defined(PNG_PREFIX) && !defined(PNGPREFIX_H)
77 # include "pngprefix.h"
78 #endif
79 
80 #ifdef PNG_USER_CONFIG
81 # include "pngusr.h"
82  /* These should have been defined in pngusr.h */
83 # ifndef PNG_USER_PRIVATEBUILD
84 # define PNG_USER_PRIVATEBUILD "Custom libpng build"
85 # endif
86 # ifndef PNG_USER_DLLFNAME_POSTFIX
87 # define PNG_USER_DLLFNAME_POSTFIX "Cb"
88 # endif
89 #endif
90 
91 /* Compile time options.
92  * =====================
93  * In a multi-arch build the compiler may compile the code several times for the
94  * same object module, producing different binaries for different architectures.
95  * When this happens configure-time setting of the target host options cannot be
96  * done and this interferes with the handling of the ARM NEON optimizations, and
97  * possibly other similar optimizations. Put additional tests here; in general
98  * this is needed when the same option can be changed at both compile time and
99  * run time depending on the target OS (i.e. iOS vs Android.)
100  *
101  * NOTE: symbol prefixing does not pass $(CFLAGS) to the preprocessor, because
102  * this is not possible with certain compilers (Oracle SUN OS CC), as a result
103  * it is necessary to ensure that all extern functions that *might* be used
104  * regardless of $(CFLAGS) get declared in this file. The test on __ARM_NEON__
105  * below is one example of this behavior because it is controlled by the
106  * presence or not of -mfpu=neon on the GCC command line, it is possible to do
107  * this in $(CC), e.g. "CC=gcc -mfpu=neon", but people who build libpng rarely
108  * do this.
109  */
110 #ifndef PNG_ARM_NEON_OPT
111  /* ARM NEON optimizations are being controlled by the compiler settings,
112  * typically the target FPU. If the FPU has been set to NEON (-mfpu=neon
113  * with GCC) then the compiler will define __ARM_NEON__ and we can rely
114  * unconditionally on NEON instructions not crashing, otherwise we must
115  * disable use of NEON instructions.
116  *
117  * NOTE: at present these optimizations depend on 'ALIGNED_MEMORY', so they
118  * can only be turned on automatically if that is supported too. If
119  * PNG_ARM_NEON_OPT is set in CPPFLAGS (to >0) then arm/arm_init.c will fail
120  * to compile with an appropriate #error if ALIGNED_MEMORY has been turned
121  * off.
122  *
123  * Note that gcc-4.9 defines __ARM_NEON instead of the deprecated
124  * __ARM_NEON__, so we check both variants.
125  *
126  * To disable ARM_NEON optimizations entirely, and skip compiling the
127  * associated assembler code, pass --enable-arm-neon=no to configure
128  * or put -DPNG_ARM_NEON_OPT=0 in CPPFLAGS.
129  */
130 # if (defined(__ARM_NEON__) || defined(__ARM_NEON)) && \
131  defined(PNG_ALIGNED_MEMORY_SUPPORTED)
132 # define PNG_ARM_NEON_OPT 2
133 # else
134 # define PNG_ARM_NEON_OPT 0
135 # endif
136 #endif
137 
138 #if PNG_ARM_NEON_OPT > 0
139  /* NEON optimizations are to be at least considered by libpng, so enable the
140  * callbacks to do this.
141  */
142 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_neon
143 
144  /* By default the 'intrinsics' code in arm/filter_neon_intrinsics.c is used
145  * if possible - if __ARM_NEON__ is set and the compiler version is not known
146  * to be broken. This is controlled by PNG_ARM_NEON_IMPLEMENTATION which can
147  * be:
148  *
149  * 1 The intrinsics code (the default with __ARM_NEON__)
150  * 2 The hand coded assembler (the default without __ARM_NEON__)
151  *
152  * It is possible to set PNG_ARM_NEON_IMPLEMENTATION in CPPFLAGS, however
153  * this is *NOT* supported and may cease to work even after a minor revision
154  * to libpng. It *is* valid to do this for testing purposes, e.g. speed
155  * testing or a new compiler, but the results should be communicated to the
156  * libpng implementation list for incorporation in the next minor release.
157  */
158 # ifndef PNG_ARM_NEON_IMPLEMENTATION
159 # if defined(__ARM_NEON__) || defined(__ARM_NEON)
160 # if defined(__clang__)
161  /* At present it is unknown by the libpng developers which versions
162  * of clang support the intrinsics, however some or perhaps all
163  * versions do not work with the assembler so this may be
164  * irrelevant, so just use the default (do nothing here.)
165  */
166 # elif defined(__GNUC__)
167  /* GCC 4.5.4 NEON support is known to be broken. 4.6.3 is known to
168  * work, so if this *is* GCC, or G++, look for a version >4.5
169  */
170 # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)
171 # define PNG_ARM_NEON_IMPLEMENTATION 2
172 # endif /* no GNUC support */
173 # endif /* __GNUC__ */
174 # else /* !defined __ARM_NEON__ */
175  /* The 'intrinsics' code simply won't compile without this -mfpu=neon:
176  */
177 # if !defined(__aarch64__) && !defined(_M_ARM64)
178  /* The assembler code currently does not work on ARM64 */
179 # define PNG_ARM_NEON_IMPLEMENTATION 2
180 # endif /* __aarch64__ */
181 # endif /* __ARM_NEON__ */
182 # endif /* !PNG_ARM_NEON_IMPLEMENTATION */
183 
184 # ifndef PNG_ARM_NEON_IMPLEMENTATION
185  /* Use the intrinsics code by default. */
186 # define PNG_ARM_NEON_IMPLEMENTATION 1
187 # endif
188 #else /* PNG_ARM_NEON_OPT == 0 */
189 # define PNG_ARM_NEON_IMPLEMENTATION 0
190 #endif /* PNG_ARM_NEON_OPT > 0 */
191 
192 #ifndef PNG_MIPS_MSA_OPT
193 # if defined(__mips_msa) && (__mips_isa_rev >= 5) && defined(PNG_ALIGNED_MEMORY_SUPPORTED)
194 # define PNG_MIPS_MSA_OPT 2
195 # else
196 # define PNG_MIPS_MSA_OPT 0
197 # endif
198 #endif
199 
200 #ifndef PNG_POWERPC_VSX_OPT
201 # if defined(__PPC64__) && defined(__ALTIVEC__) && defined(__VSX__)
202 # define PNG_POWERPC_VSX_OPT 2
203 # else
204 # define PNG_POWERPC_VSX_OPT 0
205 # endif
206 #endif
207 
208 #ifndef PNG_INTEL_SSE_OPT
209 # ifdef PNG_INTEL_SSE
210  /* Only check for SSE if the build configuration has been modified to
211  * enable SSE optimizations. This means that these optimizations will
212  * be off by default. See contrib/intel for more details.
213  */
214 # if defined(__SSE4_1__) || defined(__AVX__) || defined(__SSSE3__) || \
215  defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \
216  (defined(_M_IX86_FP) && _M_IX86_FP >= 2)
217 # define PNG_INTEL_SSE_OPT 1
218 # else
219 # define PNG_INTEL_SSE_OPT 0
220 # endif
221 # else
222 # define PNG_INTEL_SSE_OPT 0
223 # endif
224 #endif
225 
226 #if PNG_INTEL_SSE_OPT > 0
227 # ifndef PNG_INTEL_SSE_IMPLEMENTATION
228 # if defined(__SSE4_1__) || defined(__AVX__)
229  /* We are not actually using AVX, but checking for AVX is the best
230  way we can detect SSE4.1 and SSSE3 on MSVC.
231  */
232 # define PNG_INTEL_SSE_IMPLEMENTATION 3
233 # elif defined(__SSSE3__)
234 # define PNG_INTEL_SSE_IMPLEMENTATION 2
235 # elif defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \
236  (defined(_M_IX86_FP) && _M_IX86_FP >= 2)
237 # define PNG_INTEL_SSE_IMPLEMENTATION 1
238 # else
239 # define PNG_INTEL_SSE_IMPLEMENTATION 0
240 # endif
241 # endif
242 
243 # if PNG_INTEL_SSE_IMPLEMENTATION > 0
244 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_sse2
245 # endif
246 #else
247 # define PNG_INTEL_SSE_IMPLEMENTATION 0
248 #endif
249 
250 #if PNG_MIPS_MSA_OPT > 0
251 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_msa
252 # ifndef PNG_MIPS_MSA_IMPLEMENTATION
253 # if defined(__mips_msa)
254 # if defined(__clang__)
255 # elif defined(__GNUC__)
256 # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7)
257 # define PNG_MIPS_MSA_IMPLEMENTATION 2
258 # endif /* no GNUC support */
259 # endif /* __GNUC__ */
260 # else /* !defined __mips_msa */
261 # define PNG_MIPS_MSA_IMPLEMENTATION 2
262 # endif /* __mips_msa */
263 # endif /* !PNG_MIPS_MSA_IMPLEMENTATION */
264 
265 # ifndef PNG_MIPS_MSA_IMPLEMENTATION
266 # define PNG_MIPS_MSA_IMPLEMENTATION 1
267 # endif
268 #else
269 # define PNG_MIPS_MSA_IMPLEMENTATION 0
270 #endif /* PNG_MIPS_MSA_OPT > 0 */
271 
272 #if PNG_POWERPC_VSX_OPT > 0
273 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_vsx
274 # define PNG_POWERPC_VSX_IMPLEMENTATION 1
275 #else
276 # define PNG_POWERPC_VSX_IMPLEMENTATION 0
277 #endif
278 
279 
280 /* Is this a build of a DLL where compilation of the object modules requires
281  * different preprocessor settings to those required for a simple library? If
282  * so PNG_BUILD_DLL must be set.
283  *
284  * If libpng is used inside a DLL but that DLL does not export the libpng APIs
285  * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a
286  * static library of libpng then link the DLL against that.
287  */
288 #ifndef PNG_BUILD_DLL
289 # ifdef DLL_EXPORT
290  /* This is set by libtool when files are compiled for a DLL; libtool
291  * always compiles twice, even on systems where it isn't necessary. Set
292  * PNG_BUILD_DLL in case it is necessary:
293  */
294 # define PNG_BUILD_DLL
295 # else
296 # ifdef _WINDLL
297  /* This is set by the Microsoft Visual Studio IDE in projects that
298  * build a DLL. It can't easily be removed from those projects (it
299  * isn't visible in the Visual Studio UI) so it is a fairly reliable
300  * indication that PNG_IMPEXP needs to be set to the DLL export
301  * attributes.
302  */
303 # define PNG_BUILD_DLL
304 # else
305 # ifdef __DLL__
306  /* This is set by the Borland C system when compiling for a DLL
307  * (as above.)
308  */
309 # define PNG_BUILD_DLL
310 # else
311  /* Add additional compiler cases here. */
312 # endif
313 # endif
314 # endif
315 #endif /* Setting PNG_BUILD_DLL if required */
316 
317 /* See pngconf.h for more details: the builder of the library may set this on
318  * the command line to the right thing for the specific compilation system or it
319  * may be automagically set above (at present we know of no system where it does
320  * need to be set on the command line.)
321  *
322  * PNG_IMPEXP must be set here when building the library to prevent pngconf.h
323  * setting it to the "import" setting for a DLL build.
324  */
325 #ifndef PNG_IMPEXP
326 # ifdef PNG_BUILD_DLL
327 # define PNG_IMPEXP PNG_DLL_EXPORT
328 # else
329  /* Not building a DLL, or the DLL doesn't require specific export
330  * definitions.
331  */
332 # define PNG_IMPEXP
333 # endif
334 #endif
335 
336 /* No warnings for private or deprecated functions in the build: */
337 #ifndef PNG_DEPRECATED
338 # define PNG_DEPRECATED
339 #endif
340 #ifndef PNG_PRIVATE
341 # define PNG_PRIVATE
342 #endif
343 
344 /* Symbol preprocessing support.
345  *
346  * To enable listing global, but internal, symbols the following macros should
347  * always be used to declare an extern data or function object in this file.
348  */
349 #ifndef PNG_INTERNAL_DATA
350 # define PNG_INTERNAL_DATA(type, name, array) PNG_LINKAGE_DATA type name array
351 #endif
352 
353 #ifndef PNG_INTERNAL_FUNCTION
354 # define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\
355  PNG_LINKAGE_FUNCTION PNG_FUNCTION(type, name, args, PNG_EMPTY attributes)
356 #endif
357 
358 #ifndef PNG_INTERNAL_CALLBACK
359 # define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\
360  PNG_LINKAGE_CALLBACK PNG_FUNCTION(type, (PNGCBAPI name), args,\
361  PNG_EMPTY attributes)
362 #endif
363 
364 /* If floating or fixed point APIs are disabled they may still be compiled
365  * internally. To handle this make sure they are declared as the appropriate
366  * internal extern function (otherwise the symbol prefixing stuff won't work and
367  * the functions will be used without definitions.)
368  *
369  * NOTE: although all the API functions are declared here they are not all
370  * actually built! Because the declarations are still made it is necessary to
371  * fake out types that they depend on.
372  */
373 #ifndef PNG_FP_EXPORT
374 # ifndef PNG_FLOATING_POINT_SUPPORTED
375 # define PNG_FP_EXPORT(ordinal, type, name, args)\
376  PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
377 # ifndef PNG_VERSION_INFO_ONLY
378  typedef struct png_incomplete png_double;
382 # endif
383 # endif
384 #endif
385 #ifndef PNG_FIXED_EXPORT
386 # ifndef PNG_FIXED_POINT_SUPPORTED
387 # define PNG_FIXED_EXPORT(ordinal, type, name, args)\
388  PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
389 # endif
390 #endif
391 
392 #include "png.h"
393 
394 /* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */
395 #ifndef PNG_DLL_EXPORT
396 # define PNG_DLL_EXPORT
397 #endif
398 
399 /* This is a global switch to set the compilation for an installed system
400  * (a release build). It can be set for testing debug builds to ensure that
401  * they will compile when the build type is switched to RC or STABLE, the
402  * default is just to use PNG_LIBPNG_BUILD_BASE_TYPE. Set this in CPPFLAGS
403  * with either:
404  *
405  * -DPNG_RELEASE_BUILD Turns on the release compile path
406  * -DPNG_RELEASE_BUILD=0 Turns it off
407  * or in your pngusr.h with
408  * #define PNG_RELEASE_BUILD=1 Turns on the release compile path
409  * #define PNG_RELEASE_BUILD=0 Turns it off
410  */
411 #ifndef PNG_RELEASE_BUILD
412 # define PNG_RELEASE_BUILD (PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC)
413 #endif
414 
415 /* SECURITY and SAFETY:
416  *
417  * libpng is built with support for internal limits on image dimensions and
418  * memory usage. These are documented in scripts/pnglibconf.dfa of the
419  * source and recorded in the machine generated header file pnglibconf.h.
420  */
421 
422 /* If you are running on a machine where you cannot allocate more
423  * than 64K of memory at once, uncomment this. While libpng will not
424  * normally need that much memory in a chunk (unless you load up a very
425  * large file), zlib needs to know how big of a chunk it can use, and
426  * libpng thus makes sure to check any memory allocation to verify it
427  * will fit into memory.
428  *
429  * zlib provides 'MAXSEG_64K' which, if defined, indicates the
430  * same limit and pngconf.h (already included) sets the limit
431  * if certain operating systems are detected.
432  */
433 #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
434 # define PNG_MAX_MALLOC_64K
435 #endif
436 
437 #ifndef PNG_UNUSED
438 /* Unused formal parameter warnings are silenced using the following macro
439  * which is expected to have no bad effects on performance (optimizing
440  * compilers will probably remove it entirely). Note that if you replace
441  * it with something other than whitespace, you must include the terminating
442  * semicolon.
443  */
444 # define PNG_UNUSED(param) (void)param;
445 #endif
446 
447 /* Just a little check that someone hasn't tried to define something
448  * contradictory.
449  */
450 #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K)
451 # undef PNG_ZBUF_SIZE
452 # define PNG_ZBUF_SIZE 65536L
453 #endif
454 
455 /* If warnings or errors are turned off the code is disabled or redirected here.
456  * From 1.5.4 functions have been added to allow very limited formatting of
457  * error and warning messages - this code will also be disabled here.
458  */
459 #ifdef PNG_WARNINGS_SUPPORTED
460 # define PNG_WARNING_PARAMETERS(p) png_warning_parameters p;
461 #else
462 # define png_warning_parameter(p,number,string) ((void)0)
463 # define png_warning_parameter_unsigned(p,number,format,value) ((void)0)
464 # define png_warning_parameter_signed(p,number,format,value) ((void)0)
465 # define png_formatted_warning(pp,p,message) ((void)(pp))
466 # define PNG_WARNING_PARAMETERS(p)
467 #endif
468 #ifndef PNG_ERROR_TEXT_SUPPORTED
469 # define png_fixed_error(s1,s2) png_err(s1)
470 #endif
471 
472 /* Some fixed point APIs are still required even if not exported because
473  * they get used by the corresponding floating point APIs. This magic
474  * deals with this:
475  */
476 #ifdef PNG_FIXED_POINT_SUPPORTED
477 # define PNGFAPI PNGAPI
478 #else
479 # define PNGFAPI /* PRIVATE */
480 #endif
481 
482 #ifndef PNG_VERSION_INFO_ONLY
483 /* Other defines specific to compilers can go here. Try to keep
484  * them inside an appropriate ifdef/endif pair for portability.
485  */
486 
487 /* C allows up-casts from (void*) to any pointer and (const void*) to any
488  * pointer to a const object. C++ regards this as a type error and requires an
489  * explicit, static, cast and provides the static_cast<> rune to ensure that
490  * const is not cast away.
491  */
492 #ifdef __cplusplus
493 # define png_voidcast(type, value) static_cast<type>(value)
494 # define png_constcast(type, value) const_cast<type>(value)
495 # define png_aligncast(type, value) \
496  static_cast<type>(static_cast<void*>(value))
497 # define png_aligncastconst(type, value) \
498  static_cast<type>(static_cast<const void*>(value))
499 #else
500 # define png_voidcast(type, value) (value)
501 # define png_constcast(type, value) ((type)(void*)(const void*)(value))
502 # define png_aligncast(type, value) ((void*)(value))
503 # define png_aligncastconst(type, value) ((const void*)(value))
504 #endif /* __cplusplus */
505 
506 #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\
507  defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
508  /* png.c requires the following ANSI-C constants if the conversion of
509  * floating point to ASCII is implemented therein:
510  *
511  * DBL_DIG Maximum number of decimal digits (can be set to any constant)
512  * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value)
513  * DBL_MAX Maximum floating point number (can be set to an arbitrary value)
514  */
515 # include <float.h>
516 
517 # if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
518  defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
519  /* We need to check that <math.h> hasn't already been included earlier
520  * as it seems it doesn't agree with <fp.h>, yet we should really use
521  * <fp.h> if possible.
522  */
523 # if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
524 # include <fp.h>
525 # endif
526 # else
527 # include <math.h>
528 # endif
529 # if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
530  /* Amiga SAS/C: We must include builtin FPU functions when compiling using
531  * MATH=68881
532  */
533 # include <m68881.h>
534 # endif
535 #endif
536 
537 /* This provides the non-ANSI (far) memory allocation routines. */
538 #if defined(__TURBOC__) && defined(__MSDOS__)
539 # include <mem.h>
540 # include <alloc.h>
541 #endif
542 
543 #if defined(_WIN32) || defined(__WIN32__) || defined(__NT__)
544 # include <windows.h>
545 #endif
546 #endif /* PNG_VERSION_INFO_ONLY */
547 
548 /* Moved here around 1.5.0beta36 from pngconf.h */
549 /* Users may want to use these so they are not private. Any library
550  * functions that are passed far data must be model-independent.
551  */
552 
553 /* Platform-independent functions */
554 #ifndef PNG_ABORT
555 # define PNG_ABORT() abort()
556 #endif
557 
558 /* These macros may need to be architecture dependent. */
559 #define PNG_ALIGN_NONE 0 /* do not use data alignment */
560 #define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */
561 #ifdef offsetof
562 # define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */
563 #else
564 # define PNG_ALIGN_OFFSET -1 /* prevent the use of this */
565 #endif
566 #define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */
567 
568 #ifndef PNG_ALIGN_TYPE
569  /* Default to using aligned access optimizations and requiring alignment to a
570  * multiple of the data type size. Override in a compiler specific fashion
571  * if necessary by inserting tests here:
572  */
573 # define PNG_ALIGN_TYPE PNG_ALIGN_SIZE
574 #endif
575 
576 #if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE
577  /* This is used because in some compiler implementations non-aligned
578  * structure members are supported, so the offsetof approach below fails.
579  * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access
580  * is good for performance. Do not do this unless you have tested the
581  * result and understand it.
582  */
583 # define png_alignof(type) (sizeof(type))
584 #else
585 # if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET
586 # define png_alignof(type) offsetof(struct{char c; type t;}, t)
587 # else
588 # if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS
589 # define png_alignof(type) 1
590 # endif
591  /* Else leave png_alignof undefined to prevent use thereof */
592 # endif
593 #endif
594 
595 /* This implicitly assumes alignment is always a multiple of 2. */
596 #ifdef png_alignof
597 # define png_isaligned(ptr, type) \
598  (((type)(size_t)((const void*)(ptr)) & (type)(png_alignof(type)-1)) == 0)
599 #else
600 # define png_isaligned(ptr, type) 0
601 #endif
602 
603 /* End of memory model/platform independent support */
604 /* End of 1.5.0beta36 move from pngconf.h */
605 
606 /* CONSTANTS and UTILITY MACROS
607  * These are used internally by libpng and not exposed in the API
608  */
609 
610 /* Various modes of operation. Note that after an init, mode is set to
611  * zero automatically when the structure is created. Three of these
612  * are defined in png.h because they need to be visible to applications
613  * that call png_set_unknown_chunk().
614  */
615 /* #define PNG_HAVE_IHDR 0x01U (defined in png.h) */
616 /* #define PNG_HAVE_PLTE 0x02U (defined in png.h) */
617 #define PNG_HAVE_IDAT 0x04U
618 /* #define PNG_AFTER_IDAT 0x08U (defined in png.h) */
619 #define PNG_HAVE_IEND 0x10U
620  /* 0x20U (unused) */
621  /* 0x40U (unused) */
622  /* 0x80U (unused) */
623 #define PNG_HAVE_CHUNK_HEADER 0x100U
624 #define PNG_WROTE_tIME 0x200U
625 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400U
626 #define PNG_BACKGROUND_IS_GRAY 0x800U
627 #define PNG_HAVE_PNG_SIGNATURE 0x1000U
628 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000U /* Have another chunk after IDAT */
629  /* 0x4000U (unused) */
630 #define PNG_IS_READ_STRUCT 0x8000U /* Else is a write struct */
631 
632 /* Flags for the transformations the PNG library does on the image data */
633 #define PNG_BGR 0x0001U
634 #define PNG_INTERLACE 0x0002U
635 #define PNG_PACK 0x0004U
636 #define PNG_SHIFT 0x0008U
637 #define PNG_SWAP_BYTES 0x0010U
638 #define PNG_INVERT_MONO 0x0020U
639 #define PNG_QUANTIZE 0x0040U
640 #define PNG_COMPOSE 0x0080U /* Was PNG_BACKGROUND */
641 #define PNG_BACKGROUND_EXPAND 0x0100U
642 #define PNG_EXPAND_16 0x0200U /* Added to libpng 1.5.2 */
643 #define PNG_16_TO_8 0x0400U /* Becomes 'chop' in 1.5.4 */
644 #define PNG_RGBA 0x0800U
645 #define PNG_EXPAND 0x1000U
646 #define PNG_GAMMA 0x2000U
647 #define PNG_GRAY_TO_RGB 0x4000U
648 #define PNG_FILLER 0x8000U
649 #define PNG_PACKSWAP 0x10000U
650 #define PNG_SWAP_ALPHA 0x20000U
651 #define PNG_STRIP_ALPHA 0x40000U
652 #define PNG_INVERT_ALPHA 0x80000U
653 #define PNG_USER_TRANSFORM 0x100000U
654 #define PNG_RGB_TO_GRAY_ERR 0x200000U
655 #define PNG_RGB_TO_GRAY_WARN 0x400000U
656 #define PNG_RGB_TO_GRAY 0x600000U /* two bits, RGB_TO_GRAY_ERR|WARN */
657 #define PNG_ENCODE_ALPHA 0x800000U /* Added to libpng-1.5.4 */
658 #define PNG_ADD_ALPHA 0x1000000U /* Added to libpng-1.2.7 */
659 #define PNG_EXPAND_tRNS 0x2000000U /* Added to libpng-1.2.9 */
660 #define PNG_SCALE_16_TO_8 0x4000000U /* Added to libpng-1.5.4 */
661  /* 0x8000000U unused */
662  /* 0x10000000U unused */
663  /* 0x20000000U unused */
664  /* 0x40000000U unused */
665 /* Flags for png_create_struct */
666 #define PNG_STRUCT_PNG 0x0001U
667 #define PNG_STRUCT_INFO 0x0002U
668 
669 /* Flags for the png_ptr->flags rather than declaring a byte for each one */
670 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001U
671 #define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002U /* Added to libpng-1.6.0 */
672  /* 0x0004U unused */
673 #define PNG_FLAG_ZSTREAM_ENDED 0x0008U /* Added to libpng-1.6.0 */
674  /* 0x0010U unused */
675  /* 0x0020U unused */
676 #define PNG_FLAG_ROW_INIT 0x0040U
677 #define PNG_FLAG_FILLER_AFTER 0x0080U
678 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100U
679 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200U
680 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400U
681 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800U
682 #define PNG_FLAG_ASSUME_sRGB 0x1000U /* Added to libpng-1.5.4 */
683 #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000U /* Added to libpng-1.5.4 */
684 #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000U /* Added to libpng-1.5.4 */
685 /* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000U */
686 /* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000U */
687 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000U
688 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000U
689 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000U
690 #define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000U /* Added to libpng-1.4.0 */
691 #define PNG_FLAG_APP_WARNINGS_WARN 0x200000U /* Added to libpng-1.6.0 */
692 #define PNG_FLAG_APP_ERRORS_WARN 0x400000U /* Added to libpng-1.6.0 */
693  /* 0x800000U unused */
694  /* 0x1000000U unused */
695  /* 0x2000000U unused */
696  /* 0x4000000U unused */
697  /* 0x8000000U unused */
698  /* 0x10000000U unused */
699  /* 0x20000000U unused */
700  /* 0x40000000U unused */
701 
702 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
703  PNG_FLAG_CRC_ANCILLARY_NOWARN)
704 
705 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
706  PNG_FLAG_CRC_CRITICAL_IGNORE)
707 
708 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
709  PNG_FLAG_CRC_CRITICAL_MASK)
710 
711 /* Save typing and make code easier to understand */
712 
713 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
714  abs((int)((c1).green) - (int)((c2).green)) + \
715  abs((int)((c1).blue) - (int)((c2).blue)))
716 
717 /* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255
718  * by dividing by 257 *with rounding*. This macro is exact for the given range.
719  * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the
720  * macro were established by experiment (modifying the added value). The macro
721  * has a second variant that takes a value already scaled by 255 and divides by
722  * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it
723  * only gives off-by-one errors and only for 0.5% (1 in 200) of the values.
724  */
725 #define PNG_DIV65535(v24) (((v24) + 32895) >> 16)
726 #define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255)
727 
728 /* Added to libpng-1.2.6 JB */
729 #define PNG_ROWBYTES(pixel_bits, width) \
730  ((pixel_bits) >= 8 ? \
731  ((size_t)(width) * (((size_t)(pixel_bits)) >> 3)) : \
732  (( ((size_t)(width) * ((size_t)(pixel_bits))) + 7) >> 3) )
733 
734 /* This returns the number of trailing bits in the last byte of a row, 0 if the
735  * last byte is completely full of pixels. It is, in principle, (pixel_bits x
736  * width) % 8, but that would overflow for large 'width'. The second macro is
737  * the same except that it returns the number of unused bits in the last byte;
738  * (8-TRAILBITS), but 0 when TRAILBITS is 0.
739  *
740  * NOTE: these macros are intended to be self-evidently correct and never
741  * overflow on the assumption that pixel_bits is in the range 0..255. The
742  * arguments are evaluated only once and they can be signed (e.g. as a result of
743  * the integral promotions). The result of the expression always has type
744  * (png_uint_32), however the compiler always knows it is in the range 0..7.
745  */
746 #define PNG_TRAILBITS(pixel_bits, width) \
747  (((pixel_bits) * ((width) % (png_uint_32)8)) % 8)
748 
749 #define PNG_PADBITS(pixel_bits, width) \
750  ((8 - PNG_TRAILBITS(pixel_bits, width)) % 8)
751 
752 /* PNG_OUT_OF_RANGE returns true if value is outside the range
753  * ideal-delta..ideal+delta. Each argument is evaluated twice.
754  * "ideal" and "delta" should be constants, normally simple
755  * integers, "value" a variable. Added to libpng-1.2.6 JB
756  */
757 #define PNG_OUT_OF_RANGE(value, ideal, delta) \
758  ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
759 
760 /* Conversions between fixed and floating point, only defined if
761  * required (to make sure the code doesn't accidentally use float
762  * when it is supposedly disabled.)
763  */
764 #ifdef PNG_FLOATING_POINT_SUPPORTED
765 /* The floating point conversion can't overflow, though it can and
766  * does lose accuracy relative to the original fixed point value.
767  * In practice this doesn't matter because png_fixed_point only
768  * stores numbers with very low precision. The png_ptr and s
769  * arguments are unused by default but are there in case error
770  * checking becomes a requirement.
771  */
772 #define png_float(png_ptr, fixed, s) (.00001 * (fixed))
773 
774 /* The fixed point conversion performs range checking and evaluates
775  * its argument multiple times, so must be used with care. The
776  * range checking uses the PNG specification values for a signed
777  * 32-bit fixed point value except that the values are deliberately
778  * rounded-to-zero to an integral value - 21474 (21474.83 is roughly
779  * (2^31-1) * 100000). 's' is a string that describes the value being
780  * converted.
781  *
782  * NOTE: this macro will raise a png_error if the range check fails,
783  * therefore it is normally only appropriate to use this on values
784  * that come from API calls or other sources where an out of range
785  * error indicates a programming error, not a data error!
786  *
787  * NOTE: by default this is off - the macro is not used - because the
788  * function call saves a lot of code.
789  */
790 #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED
791 #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\
792  ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0))
793 #endif
794 /* else the corresponding function is defined below, inside the scope of the
795  * cplusplus test.
796  */
797 #endif
798 
799 /* Constants for known chunk types. If you need to add a chunk, define the name
800  * here. For historical reasons these constants have the form png_<name>; i.e.
801  * the prefix is lower case. Please use decimal values as the parameters to
802  * match the ISO PNG specification and to avoid relying on the C locale
803  * interpretation of character values.
804  *
805  * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values
806  * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string
807  * to be generated if required.
808  *
809  * PNG_32b correctly produces a value shifted by up to 24 bits, even on
810  * architectures where (int) is only 16 bits.
811  */
812 #define PNG_32b(b,s) ((png_uint_32)(b) << (s))
813 #define PNG_U32(b1,b2,b3,b4) \
814  (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0))
815 
816 /* Constants for known chunk types.
817  *
818  * MAINTAINERS: If you need to add a chunk, define the name here.
819  * For historical reasons these constants have the form png_<name>; i.e.
820  * the prefix is lower case. Please use decimal values as the parameters to
821  * match the ISO PNG specification and to avoid relying on the C locale
822  * interpretation of character values. Please keep the list sorted.
823  *
824  * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk
825  * type. In fact the specification does not express chunk types this way,
826  * however using a 32-bit value means that the chunk type can be read from the
827  * stream using exactly the same code as used for a 32-bit unsigned value and
828  * can be examined far more efficiently (using one arithmetic compare).
829  *
830  * Prior to 1.5.6 the chunk type constants were expressed as C strings. The
831  * libpng API still uses strings for 'unknown' chunks and a macro,
832  * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice
833  * that for portable code numeric values must still be used; the string "IHDR"
834  * is not portable and neither is PNG_U32('I', 'H', 'D', 'R').
835  *
836  * In 1.7.0 the definitions will be made public in png.h to avoid having to
837  * duplicate the same definitions in application code.
838  */
839 #define png_IDAT PNG_U32( 73, 68, 65, 84)
840 #define png_IEND PNG_U32( 73, 69, 78, 68)
841 #define png_IHDR PNG_U32( 73, 72, 68, 82)
842 #define png_PLTE PNG_U32( 80, 76, 84, 69)
843 #define png_bKGD PNG_U32( 98, 75, 71, 68)
844 #define png_cHRM PNG_U32( 99, 72, 82, 77)
845 #define png_eXIf PNG_U32(101, 88, 73, 102) /* registered July 2017 */
846 #define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */
847 #define png_gAMA PNG_U32(103, 65, 77, 65)
848 #define png_gIFg PNG_U32(103, 73, 70, 103)
849 #define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */
850 #define png_gIFx PNG_U32(103, 73, 70, 120)
851 #define png_hIST PNG_U32(104, 73, 83, 84)
852 #define png_iCCP PNG_U32(105, 67, 67, 80)
853 #define png_iTXt PNG_U32(105, 84, 88, 116)
854 #define png_oFFs PNG_U32(111, 70, 70, 115)
855 #define png_pCAL PNG_U32(112, 67, 65, 76)
856 #define png_pHYs PNG_U32(112, 72, 89, 115)
857 #define png_sBIT PNG_U32(115, 66, 73, 84)
858 #define png_sCAL PNG_U32(115, 67, 65, 76)
859 #define png_sPLT PNG_U32(115, 80, 76, 84)
860 #define png_sRGB PNG_U32(115, 82, 71, 66)
861 #define png_sTER PNG_U32(115, 84, 69, 82)
862 #define png_tEXt PNG_U32(116, 69, 88, 116)
863 #define png_tIME PNG_U32(116, 73, 77, 69)
864 #define png_tRNS PNG_U32(116, 82, 78, 83)
865 #define png_zTXt PNG_U32(122, 84, 88, 116)
866 
867 /* The following will work on (signed char*) strings, whereas the get_uint_32
868  * macro will fail on top-bit-set values because of the sign extension.
869  */
870 #define PNG_CHUNK_FROM_STRING(s)\
871  PNG_U32(0xff & (s)[0], 0xff & (s)[1], 0xff & (s)[2], 0xff & (s)[3])
872 
873 /* This uses (char), not (png_byte) to avoid warnings on systems where (char) is
874  * signed and the argument is a (char[]) This macro will fail miserably on
875  * systems where (char) is more than 8 bits.
876  */
877 #define PNG_STRING_FROM_CHUNK(s,c)\
878  (void)(((char*)(s))[0]=(char)(((c)>>24) & 0xff), \
879  ((char*)(s))[1]=(char)(((c)>>16) & 0xff),\
880  ((char*)(s))[2]=(char)(((c)>>8) & 0xff), \
881  ((char*)(s))[3]=(char)((c & 0xff)))
882 
883 /* Do the same but terminate with a null character. */
884 #define PNG_CSTRING_FROM_CHUNK(s,c)\
885  (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0)
886 
887 /* Test on flag values as defined in the spec (section 5.4): */
888 #define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29))
889 #define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c))
890 #define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21))
891 #define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13))
892 #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5))
893 
894 /* Gamma values (new at libpng-1.5.4): */
895 #define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */
896 #define PNG_GAMMA_MAC_INVERSE 65909
897 #define PNG_GAMMA_sRGB_INVERSE 45455
898 
899 /* Almost everything below is C specific; the #defines above can be used in
900  * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot.
901  */
902 #ifndef PNG_VERSION_INFO_ONLY
903 
904 #include "pngstruct.h"
905 #include "pnginfo.h"
906 
907 /* Validate the include paths - the include path used to generate pnglibconf.h
908  * must match that used in the build, or we must be using pnglibconf.h.prebuilt:
909  */
910 #if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM
911 # error ZLIB_VERNUM != PNG_ZLIB_VERNUM \
912  "-I (include path) error: see the notes in pngpriv.h"
913  /* This means that when pnglibconf.h was built the copy of zlib.h that it
914  * used is not the same as the one being used here. Because the build of
915  * libpng makes decisions to use inflateInit2 and inflateReset2 based on the
916  * zlib version number and because this affects handling of certain broken
917  * PNG files the -I directives must match.
918  *
919  * The most likely explanation is that you passed a -I in CFLAGS. This will
920  * not work; all the preprocessor directives and in particular all the -I
921  * directives must be in CPPFLAGS.
922  */
923 #endif
924 
925 /* This is used for 16-bit gamma tables -- only the top level pointers are
926  * const; this could be changed:
927  */
929 
930 /* Added to libpng-1.5.7: sRGB conversion tables */
931 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
932  defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
933 #ifdef PNG_SIMPLIFIED_READ_SUPPORTED
934 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]);
935  /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value,
936  * 0..65535. This table gives the closest 16-bit answers (no errors).
937  */
938 #endif
939 
940 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]);
941 PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]);
942 
943 #define PNG_sRGB_FROM_LINEAR(linear) \
944  ((png_byte)(0xff & ((png_sRGB_base[(linear)>>15] \
945  + ((((linear) & 0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8)))
946  /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB
947  * encoded value with maximum error 0.646365. Note that the input is not a
948  * 16-bit value; it has been multiplied by 255! */
949 #endif /* SIMPLIFIED_READ/WRITE */
950 
951 
952 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */
953 #ifdef __cplusplus
954 extern "C" {
955 #endif /* __cplusplus */
956 
957 /* Internal functions; these are not exported from a DLL however because they
958  * are used within several of the C source files they have to be C extern.
959  *
960  * All of these functions must be declared with PNG_INTERNAL_FUNCTION.
961  */
962 
963 /* Zlib support */
964 #define PNG_UNEXPECTED_ZLIB_RETURN (-7)
965 PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret),
966  PNG_EMPTY);
967  /* Used by the zlib handling functions to ensure that z_stream::msg is always
968  * set before they return.
969  */
970 
971 #ifdef PNG_WRITE_SUPPORTED
972 PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr,
973  png_compression_bufferp *list),PNG_EMPTY);
974  /* Free the buffer list used by the compressed write code. */
975 #endif
976 
977 #if defined(PNG_FLOATING_POINT_SUPPORTED) && \
978  !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \
979  (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \
980  defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \
981  defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \
982  (defined(PNG_sCAL_SUPPORTED) && \
983  defined(PNG_FLOATING_ARITHMETIC_SUPPORTED))
985  double fp, png_const_charp text),PNG_EMPTY);
986 #endif
987 
988 /* Check the user version string for compatibility, returns false if the version
989  * numbers aren't compatible.
990  */
991 PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr,
992  png_const_charp user_png_ver),PNG_EMPTY);
993 
994 /* Internal base allocator - no messages, NULL on failure to allocate. This
995  * does, however, call the application provided allocator and that could call
996  * png_error (although that would be a bug in the application implementation.)
997  */
1000 
1001 #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\
1002  defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED)
1003 /* Internal array allocator, outputs no error or warning messages on failure,
1004  * just returns NULL.
1005  */
1007  int nelements, size_t element_size),PNG_ALLOCATED);
1008 
1009 /* The same but an existing array is extended by add_elements. This function
1010  * also memsets the new elements to 0 and copies the old elements. The old
1011  * array is not freed or altered.
1012  */
1014  png_const_voidp array, int old_elements, int add_elements,
1015  size_t element_size),PNG_ALLOCATED);
1016 #endif /* text, sPLT or unknown chunks */
1017 
1018 /* Magic to create a struct when there is no struct to call the user supplied
1019  * memory allocators. Because error handling has not been set up the memory
1020  * handlers can't safely call png_error, but this is an obscure and undocumented
1021  * restriction so libpng has to assume that the 'free' handler, at least, might
1022  * call png_error.
1023  */
1024 PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct,
1025  (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
1026  png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn,
1027  png_free_ptr free_fn),PNG_ALLOCATED);
1028 
1029 /* Free memory from internal libpng struct */
1030 PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr),
1031  PNG_EMPTY);
1032 
1033 /* Free an allocated jmp_buf (always succeeds) */
1034 PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY);
1035 
1036 /* Function to allocate memory for zlib. PNGAPI is disallowed. */
1038  PNG_ALLOCATED);
1039 
1040 /* Function to free memory for zlib. PNGAPI is disallowed. */
1042 
1043 /* Next four functions are used internally as callbacks. PNGCBAPI is required
1044  * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to
1045  * PNGCBAPI at 1.5.0
1046  */
1047 
1048 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr,
1049  png_bytep data, size_t length),PNG_EMPTY);
1050 
1051 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1052 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr,
1053  png_bytep buffer, size_t length),PNG_EMPTY);
1054 #endif
1055 
1056 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr,
1057  png_bytep data, size_t length),PNG_EMPTY);
1058 
1059 #ifdef PNG_WRITE_FLUSH_SUPPORTED
1060 # ifdef PNG_STDIO_SUPPORTED
1061 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr),
1062  PNG_EMPTY);
1063 # endif
1064 #endif
1065 
1066 /* Reset the CRC variable */
1067 PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY);
1068 
1069 /* Write the "data" buffer to whatever output you are using */
1070 PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr,
1072 
1073 /* Read and check the PNG file signature */
1074 PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr,
1076 
1077 /* Read the chunk header (length + type name) */
1078 PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr),
1079  PNG_EMPTY);
1080 
1081 /* Read data from whatever input you are using into the "data" buffer */
1083  size_t length),PNG_EMPTY);
1084 
1085 /* Read bytes into buf, and update png_ptr->crc */
1088 
1089 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
1090 PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr,
1092 
1093 /* Read the CRC from the file and compare it to the libpng calculated CRC */
1095 
1096 /* Calculate the CRC over a section of data. Note that we are only
1097  * passing a maximum of 64K on systems that have this as a memory limit,
1098  * since this is the maximum buffer size we can specify.
1099  */
1100 PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr,
1101  png_const_bytep ptr, size_t length),PNG_EMPTY);
1102 
1103 #ifdef PNG_WRITE_FLUSH_SUPPORTED
1105 #endif
1106 
1107 /* Write various chunks */
1108 
1109 /* Write the IHDR chunk, and update the png_struct with the necessary
1110  * information.
1111  */
1112 PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr,
1113  png_uint_32 width, png_uint_32 height, int bit_depth, int color_type,
1114  int compression_method, int filter_method, int interlace_method),PNG_EMPTY);
1115 
1116 PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr,
1118 
1119 PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr,
1120  png_const_bytep row_data, png_alloc_size_t row_data_length, int flush),
1121  PNG_EMPTY);
1122 
1123 PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY);
1124 
1125 #ifdef PNG_WRITE_gAMA_SUPPORTED
1126 PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr,
1127  png_fixed_point file_gamma),PNG_EMPTY);
1128 #endif
1129 
1130 #ifdef PNG_WRITE_sBIT_SUPPORTED
1131 PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr,
1132  png_const_color_8p sbit, int color_type),PNG_EMPTY);
1133 #endif
1134 
1135 #ifdef PNG_WRITE_cHRM_SUPPORTED
1136 PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr,
1137  const png_xy *xy), PNG_EMPTY);
1138  /* The xy value must have been previously validated */
1139 #endif
1140 
1141 #ifdef PNG_WRITE_sRGB_SUPPORTED
1142 PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr,
1143  int intent),PNG_EMPTY);
1144 #endif
1145 
1146 #ifdef PNG_WRITE_eXIf_SUPPORTED
1147 PNG_INTERNAL_FUNCTION(void,png_write_eXIf,(png_structrp png_ptr,
1148  png_bytep exif, int num_exif),PNG_EMPTY);
1149 #endif
1150 
1151 #ifdef PNG_WRITE_iCCP_SUPPORTED
1152 PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr,
1154  /* The profile must have been previously validated for correctness, the
1155  * length comes from the first four bytes. Only the base, deflate,
1156  * compression is supported.
1157  */
1158 #endif
1159 
1160 #ifdef PNG_WRITE_sPLT_SUPPORTED
1161 PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr,
1163 #endif
1164 
1165 #ifdef PNG_WRITE_tRNS_SUPPORTED
1166 PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr,
1168  int color_type),PNG_EMPTY);
1169 #endif
1170 
1171 #ifdef PNG_WRITE_bKGD_SUPPORTED
1172 PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr,
1173  png_const_color_16p values, int color_type),PNG_EMPTY);
1174 #endif
1175 
1176 #ifdef PNG_WRITE_hIST_SUPPORTED
1177 PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr,
1178  png_const_uint_16p hist, int num_hist),PNG_EMPTY);
1179 #endif
1180 
1181 /* Chunks that have keywords */
1182 #ifdef PNG_WRITE_tEXt_SUPPORTED
1183 PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr,
1184  png_const_charp key, png_const_charp text, size_t text_len),PNG_EMPTY);
1185 #endif
1186 
1187 #ifdef PNG_WRITE_zTXt_SUPPORTED
1190 #endif
1191 
1192 #ifdef PNG_WRITE_iTXt_SUPPORTED
1193 PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr,
1196 #endif
1197 
1198 #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */
1200  png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY);
1201 #endif
1202 
1203 #ifdef PNG_WRITE_oFFs_SUPPORTED
1204 PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr,
1205  png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY);
1206 #endif
1207 
1208 #ifdef PNG_WRITE_pCAL_SUPPORTED
1209 PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr,
1210  png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
1212 #endif
1213 
1214 #ifdef PNG_WRITE_pHYs_SUPPORTED
1215 PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr,
1216  png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
1217  int unit_type),PNG_EMPTY);
1218 #endif
1219 
1220 #ifdef PNG_WRITE_tIME_SUPPORTED
1221 PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr,
1222  png_const_timep mod_time),PNG_EMPTY);
1223 #endif
1224 
1225 #ifdef PNG_WRITE_sCAL_SUPPORTED
1226 PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr,
1228 #endif
1229 
1230 /* Called when finished processing a row of data */
1231 PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr),
1232  PNG_EMPTY);
1233 
1234 /* Internal use only. Called before first row of data */
1235 PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr),
1236  PNG_EMPTY);
1237 
1238 /* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an
1239  * array of png_ptr->width pixels. If the image is not interlaced or this
1240  * is the final pass this just does a memcpy, otherwise the "display" flag
1241  * is used to determine whether to copy pixels that are not in the current pass.
1242  *
1243  * Because 'png_do_read_interlace' (below) replicates pixels this allows this
1244  * function to achieve the documented 'blocky' appearance during interlaced read
1245  * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row'
1246  * are not changed if they are not in the current pass, when display is 0.
1247  *
1248  * 'display' must be 0 or 1, otherwise the memcpy will be done regardless.
1249  *
1250  * The API always reads from the png_struct row buffer and always assumes that
1251  * it is full width (png_do_read_interlace has already been called.)
1252  *
1253  * This function is only ever used to write to row buffers provided by the
1254  * caller of the relevant libpng API and the row must have already been
1255  * transformed by the read transformations.
1256  *
1257  * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed
1258  * bitmasks for use within the code, otherwise runtime generated masks are used.
1259  * The default is compile time masks.
1260  */
1261 #ifndef PNG_USE_COMPILE_TIME_MASKS
1262 # define PNG_USE_COMPILE_TIME_MASKS 1
1263 #endif
1264 PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr,
1265  png_bytep row, int display),PNG_EMPTY);
1266 
1267 #ifdef PNG_READ_INTERLACING_SUPPORTED
1268 /* Expand an interlaced row: the 'row_info' describes the pass data that has
1269  * been read in and must correspond to the pixels in 'row', the pixels are
1270  * expanded (moved apart) in 'row' to match the final layout, when doing this
1271  * the pixels are *replicated* to the intervening space. This is essential for
1272  * the correct operation of png_combine_row, above.
1273  */
1274 PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info,
1275  png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY);
1276 #endif
1277 
1278 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
1279 
1280 #ifdef PNG_WRITE_INTERLACING_SUPPORTED
1281 /* Grab pixels out of a row for an interlaced pass */
1282 PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info,
1283  png_bytep row, int pass),PNG_EMPTY);
1284 #endif
1285 
1286 /* Unfilter a row: check the filter value before calling this, there is no point
1287  * calling it for PNG_FILTER_VALUE_NONE.
1288  */
1289 PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop
1290  row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY);
1291 
1292 #if PNG_ARM_NEON_OPT > 0
1293 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info,
1294  png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1295 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop
1296  row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1297 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop
1298  row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1299 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop
1300  row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1301 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop
1302  row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1303 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop
1304  row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1305 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop
1306  row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1307 #endif
1308 
1309 #if PNG_MIPS_MSA_OPT > 0
1310 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_msa,(png_row_infop row_info,
1311  png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1312 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_msa,(png_row_infop
1313  row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1314 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_msa,(png_row_infop
1315  row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1316 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_msa,(png_row_infop
1317  row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1318 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_msa,(png_row_infop
1319  row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1320 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_msa,(png_row_infop
1321  row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1322 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_msa,(png_row_infop
1323  row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1324 #endif
1325 
1326 #if PNG_POWERPC_VSX_OPT > 0
1327 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_vsx,(png_row_infop row_info,
1328  png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1329 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_vsx,(png_row_infop
1330  row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1331 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_vsx,(png_row_infop
1332  row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1333 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_vsx,(png_row_infop
1334  row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1335 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_vsx,(png_row_infop
1336  row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1337 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_vsx,(png_row_infop
1338  row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1339 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_vsx,(png_row_infop
1340  row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1341 #endif
1342 
1343 #if PNG_INTEL_SSE_IMPLEMENTATION > 0
1344 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_sse2,(png_row_infop
1345  row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1346 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_sse2,(png_row_infop
1347  row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1348 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_sse2,(png_row_infop
1349  row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1350 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_sse2,(png_row_infop
1351  row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1352 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_sse2,(png_row_infop
1353  row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1354 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_sse2,(png_row_infop
1355  row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1356 #endif
1357 
1358 /* Choose the best filter to use and filter the row data */
1359 PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr,
1360  png_row_infop row_info),PNG_EMPTY);
1361 
1362 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1363 PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr,
1364  png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY);
1365  /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer
1366  * is NULL the function checks, instead, for the end of the stream. In this
1367  * case a benign error will be issued if the stream end is not found or if
1368  * extra data has to be consumed.
1369  */
1370 PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr),
1371  PNG_EMPTY);
1372  /* This cleans up when the IDAT LZ stream does not end when the last image
1373  * byte is read; there is still some pending input.
1374  */
1375 
1376 PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr),
1377  PNG_EMPTY);
1378  /* Finish a row while reading, dealing with interlacing passes, etc. */
1379 #endif /* SEQUENTIAL_READ */
1380 
1381 /* Initialize the row buffers, etc. */
1382 PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY);
1383 
1384 #if ZLIB_VERNUM >= 0x1240
1385 PNG_INTERNAL_FUNCTION(int,png_zlib_inflate,(png_structrp png_ptr, int flush),
1386  PNG_EMPTY);
1387 # define PNG_INFLATE(pp, flush) png_zlib_inflate(pp, flush)
1388 #else /* Zlib < 1.2.4 */
1389 # define PNG_INFLATE(pp, flush) inflate(&(pp)->zstream, flush)
1390 #endif /* Zlib < 1.2.4 */
1391 
1392 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
1393 /* Optional call to update the users info structure */
1394 PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr,
1396 #endif
1397 
1398 /* Shared transform functions, defined in pngtran.c */
1399 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
1400  defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
1401 PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info,
1402  png_bytep row, int at_start),PNG_EMPTY);
1403 #endif
1404 
1405 #ifdef PNG_16BIT_SUPPORTED
1406 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
1407 PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info,
1409 #endif
1410 #endif
1411 
1412 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
1413  defined(PNG_WRITE_PACKSWAP_SUPPORTED)
1414 PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info,
1416 #endif
1417 
1418 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
1419 PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info,
1421 #endif
1422 
1423 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
1424 PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info,
1426 #endif
1427 
1428 /* The following decodes the appropriate chunks, and does error correction,
1429  * then calls the appropriate callback for the chunk if it is valid.
1430  */
1431 
1432 /* Decode the IHDR chunk */
1433 PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr,
1435 PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr,
1437 PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr,
1439 
1440 #ifdef PNG_READ_bKGD_SUPPORTED
1441 PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr,
1443 #endif
1444 
1445 #ifdef PNG_READ_cHRM_SUPPORTED
1446 PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr,
1448 #endif
1449 
1450 #ifdef PNG_READ_eXIf_SUPPORTED
1451 PNG_INTERNAL_FUNCTION(void,png_handle_eXIf,(png_structrp png_ptr,
1453 #endif
1454 
1455 #ifdef PNG_READ_gAMA_SUPPORTED
1456 PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr,
1458 #endif
1459 
1460 #ifdef PNG_READ_hIST_SUPPORTED
1461 PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr,
1463 #endif
1464 
1465 #ifdef PNG_READ_iCCP_SUPPORTED
1466 PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr,
1468 #endif /* READ_iCCP */
1469 
1470 #ifdef PNG_READ_iTXt_SUPPORTED
1471 PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr,
1473 #endif
1474 
1475 #ifdef PNG_READ_oFFs_SUPPORTED
1476 PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr,
1478 #endif
1479 
1480 #ifdef PNG_READ_pCAL_SUPPORTED
1481 PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr,
1483 #endif
1484 
1485 #ifdef PNG_READ_pHYs_SUPPORTED
1486 PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr,
1488 #endif
1489 
1490 #ifdef PNG_READ_sBIT_SUPPORTED
1491 PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr,
1493 #endif
1494 
1495 #ifdef PNG_READ_sCAL_SUPPORTED
1496 PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr,
1498 #endif
1499 
1500 #ifdef PNG_READ_sPLT_SUPPORTED
1501 PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr,
1503 #endif /* READ_sPLT */
1504 
1505 #ifdef PNG_READ_sRGB_SUPPORTED
1506 PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr,
1508 #endif
1509 
1510 #ifdef PNG_READ_tEXt_SUPPORTED
1511 PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr,
1513 #endif
1514 
1515 #ifdef PNG_READ_tIME_SUPPORTED
1516 PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr,
1518 #endif
1519 
1520 #ifdef PNG_READ_tRNS_SUPPORTED
1521 PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr,
1523 #endif
1524 
1525 #ifdef PNG_READ_zTXt_SUPPORTED
1526 PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr,
1528 #endif
1529 
1530 PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_const_structrp png_ptr,
1531  png_uint_32 chunk_name),PNG_EMPTY);
1532 
1533 PNG_INTERNAL_FUNCTION(void,png_check_chunk_length,(png_const_structrp png_ptr,
1534  png_uint_32 chunk_length),PNG_EMPTY);
1535 
1536 PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr,
1538  /* This is the function that gets called for unknown chunks. The 'keep'
1539  * argument is either non-zero for a known chunk that has been set to be
1540  * handled as unknown or zero for an unknown chunk. By default the function
1541  * just skips the chunk or errors out if it is critical.
1542  */
1543 
1544 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\
1545  defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
1546 PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling,
1548  /* Exactly as the API png_handle_as_unknown() except that the argument is a
1549  * 32-bit chunk name, not a string.
1550  */
1551 #endif /* READ_UNKNOWN_CHUNKS || HANDLE_AS_UNKNOWN */
1552 
1553 /* Handle the transformations for reading and writing */
1554 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
1555 PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr,
1556  png_row_infop row_info),PNG_EMPTY);
1557 #endif
1558 #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
1559 PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr,
1560  png_row_infop row_info),PNG_EMPTY);
1561 #endif
1562 
1563 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
1564 PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr),
1565  PNG_EMPTY);
1566 #endif
1567 
1568 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1569 PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr,
1571 PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr,
1573 PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY);
1574 PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr),
1575  PNG_EMPTY);
1576 PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr,
1577  png_bytep buffer, size_t buffer_length),PNG_EMPTY);
1578 PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY);
1579 PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr,
1580  png_bytep buffer, size_t buffer_length),PNG_EMPTY);
1581 PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr),
1582  PNG_EMPTY);
1583 PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr,
1585 PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr,
1587 PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr,
1589 PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr,
1591 PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr,
1593 PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr,
1595 PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr),
1596  PNG_EMPTY);
1597 # ifdef PNG_READ_tEXt_SUPPORTED
1598 PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr,
1600 PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr,
1602 # endif
1603 # ifdef PNG_READ_zTXt_SUPPORTED
1604 PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr,
1606 PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr,
1608 # endif
1609 # ifdef PNG_READ_iTXt_SUPPORTED
1610 PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr,
1612 PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr,
1614 # endif
1615 
1616 #endif /* PROGRESSIVE_READ */
1617 
1618 /* Added at libpng version 1.6.0 */
1619 #ifdef PNG_GAMMA_SUPPORTED
1620 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr,
1621  png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY);
1622  /* Set the colorspace gamma with a value provided by the application or by
1623  * the gAMA chunk on read. The value will override anything set by an ICC
1624  * profile.
1625  */
1626 
1627 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr,
1629  /* Synchronize the info 'valid' flags with the colorspace */
1630 
1631 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr,
1633  /* Copy the png_struct colorspace to the info_struct and call the above to
1634  * synchronize the flags. Checks for NULL info_ptr and does nothing.
1635  */
1636 #endif
1637 
1638 /* Added at libpng version 1.4.0 */
1639 #ifdef PNG_COLORSPACE_SUPPORTED
1640 /* These internal functions are for maintaining the colorspace structure within
1641  * a png_info or png_struct (or, indeed, both).
1642  */
1643 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities,
1644  (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy,
1645  int preferred), PNG_EMPTY);
1646 
1647 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints,
1648  (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ,
1649  int preferred), PNG_EMPTY);
1650 
1651 #ifdef PNG_sRGB_SUPPORTED
1652 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr,
1653  png_colorspacerp colorspace, int intent), PNG_EMPTY);
1654  /* This does set the colorspace gAMA and cHRM values too, but doesn't set the
1655  * flags to write them, if it returns false there was a problem and an error
1656  * message has already been output (but the colorspace may still need to be
1657  * synced to record the invalid flag).
1658  */
1659 #endif /* sRGB */
1660 
1661 #ifdef PNG_iCCP_SUPPORTED
1662 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr,
1663  png_colorspacerp colorspace, png_const_charp name,
1664  png_uint_32 profile_length, png_const_bytep profile, int color_type),
1665  PNG_EMPTY);
1666  /* The 'name' is used for information only */
1667 
1668 /* Routines for checking parts of an ICC profile. */
1669 #ifdef PNG_READ_iCCP_SUPPORTED
1670 PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr,
1671  png_colorspacerp colorspace, png_const_charp name,
1672  png_uint_32 profile_length), PNG_EMPTY);
1673 #endif /* READ_iCCP */
1674 PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr,
1675  png_colorspacerp colorspace, png_const_charp name,
1676  png_uint_32 profile_length,
1677  png_const_bytep profile /* first 132 bytes only */, int color_type),
1678  PNG_EMPTY);
1679 PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr,
1680  png_colorspacerp colorspace, png_const_charp name,
1681  png_uint_32 profile_length,
1682  png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY);
1683 #ifdef PNG_sRGB_SUPPORTED
1684 PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,(
1685  png_const_structrp png_ptr, png_colorspacerp colorspace,
1687  /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may
1688  * be zero to indicate that it is not available. It is used, if provided,
1689  * as a fast check on the profile when checking to see if it is sRGB.
1690  */
1691 #endif
1692 #endif /* iCCP */
1693 
1694 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
1695 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients,
1697  /* Set the rgb_to_gray coefficients from the colorspace Y values */
1698 #endif /* READ_RGB_TO_GRAY */
1699 #endif /* COLORSPACE */
1700 
1701 /* Added at libpng version 1.4.0 */
1702 PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr,
1703  png_uint_32 width, png_uint_32 height, int bit_depth,
1704  int color_type, int interlace_type, int compression_type,
1705  int filter_type),PNG_EMPTY);
1706 
1707 /* Added at libpng version 1.5.10 */
1708 #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \
1709  defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED)
1710 PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes,
1712 #endif
1713 
1714 #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
1717 #endif
1718 
1719 /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite
1720  * the end. Always leaves the buffer nul terminated. Never errors out (and
1721  * there is no error code.)
1722  */
1723 PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize,
1724  size_t pos, png_const_charp string),PNG_EMPTY);
1725 
1726 /* Various internal functions to handle formatted warning messages, currently
1727  * only implemented for warnings.
1728  */
1729 #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)
1730 /* Utility to dump an unsigned value into a buffer, given a start pointer and
1731  * and end pointer (which should point just *beyond* the end of the buffer!)
1732  * Returns the pointer to the start of the formatted string. This utility only
1733  * does unsigned values.
1734  */
1737 
1738 /* Convenience macro that takes an array: */
1739 #define PNG_FORMAT_NUMBER(buffer,format,number) \
1740  png_format_number(buffer, buffer + (sizeof buffer), format, number)
1741 
1742 /* Suggested size for a number buffer (enough for 64 bits and a sign!) */
1743 #define PNG_NUMBER_BUFFER_SIZE 24
1744 
1745 /* These are the integer formats currently supported, the name is formed from
1746  * the standard printf(3) format string.
1747  */
1748 #define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */
1749 #define PNG_NUMBER_FORMAT_02u 2
1750 #define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */
1751 #define PNG_NUMBER_FORMAT_02d 2
1752 #define PNG_NUMBER_FORMAT_x 3
1753 #define PNG_NUMBER_FORMAT_02x 4
1754 #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */
1755 #endif
1756 
1757 #ifdef PNG_WARNINGS_SUPPORTED
1758 /* New defines and members adding in libpng-1.5.4 */
1759 # define PNG_WARNING_PARAMETER_SIZE 32
1760 # define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */
1761 
1762 /* An l-value of this type has to be passed to the APIs below to cache the
1763  * values of the parameters to a formatted warning message.
1764  */
1765 typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][
1766  PNG_WARNING_PARAMETER_SIZE];
1767 
1768 PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p,
1769  int number, png_const_charp string),PNG_EMPTY);
1770  /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters,
1771  * including the trailing '\0'.
1772  */
1774  (png_warning_parameters p, int number, int format, png_alloc_size_t value),
1775  PNG_EMPTY);
1776  /* Use png_alloc_size_t because it is an unsigned type as big as any we
1777  * need to output. Use the following for a signed value.
1778  */
1780  (png_warning_parameters p, int number, int format, png_int_32 value),
1781  PNG_EMPTY);
1782 
1784  png_warning_parameters p, png_const_charp message),PNG_EMPTY);
1785  /* 'message' follows the X/Open approach of using @1, @2 to insert
1786  * parameters previously supplied using the above functions. Errors in
1787  * specifying the parameters will simply result in garbage substitutions.
1788  */
1789 #endif
1790 
1791 #ifdef PNG_BENIGN_ERRORS_SUPPORTED
1792 /* Application errors (new in 1.6); use these functions (declared below) for
1793  * errors in the parameters or order of API function calls on read. The
1794  * 'warning' should be used for an error that can be handled completely; the
1795  * 'error' for one which can be handled safely but which may lose application
1796  * information or settings.
1797  *
1798  * By default these both result in a png_error call prior to release, while in a
1799  * released version the 'warning' is just a warning. However if the application
1800  * explicitly disables benign errors (explicitly permitting the code to lose
1801  * information) they both turn into warnings.
1802  *
1803  * If benign errors aren't supported they end up as the corresponding base call
1804  * (png_warning or png_error.)
1805  */
1808  /* The application provided invalid parameters to an API function or called
1809  * an API function at the wrong time, libpng can completely recover.
1810  */
1811 
1814  /* As above but libpng will ignore the call, or attempt some other partial
1815  * recovery from the error.
1816  */
1817 #else
1818 # define png_app_warning(pp,s) png_warning(pp,s)
1819 # define png_app_error(pp,s) png_error(pp,s)
1820 #endif
1821 
1822 PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr,
1824  /* Report a recoverable issue in chunk data. On read this is used to report
1825  * a problem found while reading a particular chunk and the
1826  * png_chunk_benign_error or png_chunk_warning function is used as
1827  * appropriate. On write this is used to report an error that comes from
1828  * data set via an application call to a png_set_ API and png_app_error or
1829  * png_app_warning is used as appropriate.
1830  *
1831  * The 'error' parameter must have one of the following values:
1832  */
1833 #define PNG_CHUNK_WARNING 0 /* never an error */
1834 #define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */
1835 #define PNG_CHUNK_ERROR 2 /* always an error */
1836 
1837 /* ASCII to FP interfaces, currently only implemented if sCAL
1838  * support is required.
1839  */
1840 #if defined(PNG_sCAL_SUPPORTED)
1841 /* MAX_DIGITS is actually the maximum number of characters in an sCAL
1842  * width or height, derived from the precision (number of significant
1843  * digits - a build time settable option) and assumptions about the
1844  * maximum ridiculous exponent.
1845  */
1846 #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/)
1847 
1848 #ifdef PNG_FLOATING_POINT_SUPPORTED
1849 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr,
1850  png_charp ascii, size_t size, double fp, unsigned int precision),
1851  PNG_EMPTY);
1852 #endif /* FLOATING_POINT */
1853 
1854 #ifdef PNG_FIXED_POINT_SUPPORTED
1855 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr,
1856  png_charp ascii, size_t size, png_fixed_point fp),PNG_EMPTY);
1857 #endif /* FIXED_POINT */
1858 #endif /* sCAL */
1859 
1860 #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED)
1861 /* An internal API to validate the format of a floating point number.
1862  * The result is the index of the next character. If the number is
1863  * not valid it will be the index of a character in the supposed number.
1864  *
1865  * The format of a number is defined in the PNG extensions specification
1866  * and this API is strictly conformant to that spec, not anyone elses!
1867  *
1868  * The format as a regular expression is:
1869  *
1870  * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)?
1871  *
1872  * or:
1873  *
1874  * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)?
1875  *
1876  * The complexity is that either integer or fraction must be present and the
1877  * fraction is permitted to have no digits only if the integer is present.
1878  *
1879  * NOTE: The dangling E problem.
1880  * There is a PNG valid floating point number in the following:
1881  *
1882  * PNG floating point numbers are not greedy.
1883  *
1884  * Working this out requires *TWO* character lookahead (because of the
1885  * sign), the parser does not do this - it will fail at the 'r' - this
1886  * doesn't matter for PNG sCAL chunk values, but it requires more care
1887  * if the value were ever to be embedded in something more complex. Use
1888  * ANSI-C strtod if you need the lookahead.
1889  */
1890 /* State table for the parser. */
1891 #define PNG_FP_INTEGER 0 /* before or in integer */
1892 #define PNG_FP_FRACTION 1 /* before or in fraction */
1893 #define PNG_FP_EXPONENT 2 /* before or in exponent */
1894 #define PNG_FP_STATE 3 /* mask for the above */
1895 #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */
1896 #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */
1897 #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */
1898 #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */
1899 #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */
1900 
1901 /* These three values don't affect the parser. They are set but not used.
1902  */
1903 #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */
1904 #define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */
1905 #define PNG_FP_NONZERO 256 /* A non-zero value */
1906 #define PNG_FP_STICKY 448 /* The above three flags */
1907 
1908 /* This is available for the caller to store in 'state' if required. Do not
1909  * call the parser after setting it (the parser sometimes clears it.)
1910  */
1911 #define PNG_FP_INVALID 512 /* Available for callers as a distinct value */
1912 
1913 /* Result codes for the parser (boolean - true meants ok, false means
1914  * not ok yet.)
1915  */
1916 #define PNG_FP_MAYBE 0 /* The number may be valid in the future */
1917 #define PNG_FP_OK 1 /* The number is valid */
1918 
1919 /* Tests on the sticky non-zero and negative flags. To pass these checks
1920  * the state must also indicate that the whole number is valid - this is
1921  * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this
1922  * is equivalent to PNG_FP_OK above.)
1923  */
1924 #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO)
1925  /* NZ_MASK: the string is valid and a non-zero negative value */
1926 #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO)
1927  /* Z MASK: the string is valid and a non-zero value. */
1928  /* PNG_FP_SAW_DIGIT: the string is valid. */
1929 #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT)
1930 #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK)
1931 #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK)
1932 
1933 /* The actual parser. This can be called repeatedly. It updates
1934  * the index into the string and the state variable (which must
1935  * be initialized to 0). It returns a result code, as above. There
1936  * is no point calling the parser any more if it fails to advance to
1937  * the end of the string - it is stuck on an invalid character (or
1938  * terminated by '\0').
1939  *
1940  * Note that the pointer will consume an E or even an E+ and then leave
1941  * a 'maybe' state even though a preceding integer.fraction is valid.
1942  * The PNG_FP_WAS_VALID flag indicates that a preceding substring was
1943  * a valid number. It's possible to recover from this by calling
1944  * the parser again (from the start, with state 0) but with a string
1945  * that omits the last character (i.e. set the size to the index of
1946  * the problem character.) This has not been tested within libpng.
1947  */
1948 PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string,
1949  size_t size, int *statep, size_t *whereami),PNG_EMPTY);
1950 
1951 /* This is the same but it checks a complete string and returns true
1952  * only if it just contains a floating point number. As of 1.5.4 this
1953  * function also returns the state at the end of parsing the number if
1954  * it was valid (otherwise it returns 0.) This can be used for testing
1955  * for negative or zero values using the sticky flag.
1956  */
1957 PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string,
1958  size_t size),PNG_EMPTY);
1959 #endif /* pCAL || sCAL */
1960 
1961 #if defined(PNG_GAMMA_SUPPORTED) ||\
1962  defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED)
1963 /* Added at libpng version 1.5.0 */
1964 /* This is a utility to provide a*times/div (rounded) and indicate
1965  * if there is an overflow. The result is a boolean - false (0)
1966  * for overflow, true (1) if no overflow, in which case *res
1967  * holds the result.
1968  */
1970  png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY);
1971 #endif
1972 
1973 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED)
1974 /* Same deal, but issue a warning on overflow and return 0. */
1975 PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn,
1976  (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by,
1977  png_int_32 divided_by),PNG_EMPTY);
1978 #endif
1979 
1980 #ifdef PNG_GAMMA_SUPPORTED
1981 /* Calculate a reciprocal - used for gamma values. This returns
1982  * 0 if the argument is 0 in order to maintain an undefined value;
1983  * there are no warnings.
1984  */
1986  PNG_EMPTY);
1987 
1988 #ifdef PNG_READ_GAMMA_SUPPORTED
1989 /* The same but gives a reciprocal of the product of two fixed point
1990  * values. Accuracy is suitable for gamma calculations but this is
1991  * not exact - use png_muldiv for that. Only required at present on read.
1992  */
1995 #endif
1996 
1997 /* Return true if the gamma value is significantly different from 1.0 */
1998 PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value),
1999  PNG_EMPTY);
2000 #endif
2001 
2002 #ifdef PNG_READ_GAMMA_SUPPORTED
2003 /* Internal fixed point gamma correction. These APIs are called as
2004  * required to convert single values - they don't need to be fast,
2005  * they are not used when processing image pixel values.
2006  *
2007  * While the input is an 'unsigned' value it must actually be the
2008  * correct bit value - 0..255 or 0..65535 as required.
2009  */
2010 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr,
2011  unsigned int value, png_fixed_point gamma_value),PNG_EMPTY);
2012 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value,
2013  png_fixed_point gamma_value),PNG_EMPTY);
2014 PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value,
2015  png_fixed_point gamma_value),PNG_EMPTY);
2016 PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr),
2017  PNG_EMPTY);
2018 PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr,
2019  int bit_depth),PNG_EMPTY);
2020 #endif
2021 
2022 /* SIMPLIFIED READ/WRITE SUPPORT */
2023 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
2024  defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
2025 /* The internal structure that png_image::opaque points to. */
2026 typedef struct png_control
2027 {
2030  png_voidp error_buf; /* Always a jmp_buf at present. */
2031 
2032  png_const_bytep memory; /* Memory buffer. */
2033  size_t size; /* Size of the memory buffer. */
2034 
2035  unsigned int for_write :1; /* Otherwise it is a read structure */
2036  unsigned int owned_file :1; /* We own the file in io_ptr */
2037 } png_control;
2038 
2039 /* Return the pointer to the jmp_buf from a png_control: necessary because C
2040  * does not reveal the type of the elements of jmp_buf.
2041  */
2042 #ifdef __cplusplus
2043 # define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0])
2044 #else
2045 # define png_control_jmp_buf(pc) ((pc)->error_buf)
2046 #endif
2047 
2048 /* Utility to safely execute a piece of libpng code catching and logging any
2049  * errors that might occur. Returns true on success, false on failure (either
2050  * of the function or as a result of a png_error.)
2051  */
2052 PNG_INTERNAL_CALLBACK(void,png_safe_error,(png_structp png_ptr,
2054 
2055 #ifdef PNG_WARNINGS_SUPPORTED
2056 PNG_INTERNAL_CALLBACK(void,png_safe_warning,(png_structp png_ptr,
2057  png_const_charp warning_message),PNG_EMPTY);
2058 #else
2059 # define png_safe_warning 0/*dummy argument*/
2060 #endif
2061 
2062 PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image,
2063  int (*function)(png_voidp), png_voidp arg),PNG_EMPTY);
2064 
2065 /* Utility to log an error; this also cleans up the png_image; the function
2066  * always returns 0 (false).
2067  */
2068 PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image,
2070 
2071 #ifndef PNG_SIMPLIFIED_READ_SUPPORTED
2072 /* png_image_free is used by the write code but not exported */
2073 PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY);
2074 #endif /* !SIMPLIFIED_READ */
2075 
2076 #endif /* SIMPLIFIED READ/WRITE */
2077 
2078 /* These are initialization functions for hardware specific PNG filter
2079  * optimizations; list these here then select the appropriate one at compile
2080  * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined
2081  * the generic code is used.
2082  */
2083 #ifdef PNG_FILTER_OPTIMIZATIONS
2084 PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr,
2085  unsigned int bpp), PNG_EMPTY);
2086  /* Just declare the optimization that will be used */
2087 #else
2088  /* List *all* the possible optimizations here - this branch is required if
2089  * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in
2090  * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing.
2091  */
2092 # if PNG_ARM_NEON_OPT > 0
2093 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon,
2094  (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
2095 #endif
2096 
2097 #if PNG_MIPS_MSA_OPT > 0
2098 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_msa,
2099  (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
2100 #endif
2101 
2102 # if PNG_INTEL_SSE_IMPLEMENTATION > 0
2103 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_sse2,
2104  (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
2105 # endif
2106 #endif
2107 
2110 
2111 #if PNG_ARM_NEON_IMPLEMENTATION == 1
2113  png_riffle_palette_neon,
2114  (png_structrp),
2115  PNG_EMPTY);
2117  png_do_expand_palette_rgba8_neon,
2118  (png_structrp,
2119  png_row_infop,
2121  const png_bytepp,
2122  const png_bytepp),
2123  PNG_EMPTY);
2125  png_do_expand_palette_rgb8_neon,
2126  (png_structrp,
2127  png_row_infop,
2129  const png_bytepp,
2130  const png_bytepp),
2131  PNG_EMPTY);
2132 #endif
2133 
2134 /* Maintainer: Put new private prototypes here ^ */
2135 
2136 #include "pngdebug.h"
2137 
2138 #ifdef __cplusplus
2139 }
2140 #endif
2141 
2142 #endif /* PNG_VERSION_INFO_ONLY */
2143 #endif /* PNGPRIV_H */
#define png_warning_parameter_unsigned(p, number, format, value)
Definition: pngpriv.h:463
GLint GLint GLsizei width
Definition: gl.h:1546
Definition: tftpd.h:59
Definition: pdh_main.c:93
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Definition: pngpriv.h:465
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Definition: pngpriv.h:1819
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Definition: pngconf.h:436
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Definition: pngconf.h:590
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Definition: zlib.h:42
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Definition: pngpriv.h:928
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Definition: glext.h:5666
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#define PNGCBAPI
Definition: pngconf.h:258
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Definition: pngconf.h:579
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Definition: glext.h:5915
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Definition: pngconf.h:589
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Definition: process.c:116
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Definition: pngpriv.h:359
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Definition: pngpriv.h:379
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Definition: zlib.h:39
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Definition: pngconf.h:439
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Definition: glext.h:7751
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Definition: btrfs_drv.h:1364
pass
Definition: typegen.h:24
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Definition: main.cpp:783
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Definition: pngpriv.h:378
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Definition: glext.h:5645
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Definition: printf.c:71
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Definition: glext.h:5579
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Definition: dispmode.c:27
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Definition: png.h:2161
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Definition: png.h:470
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Definition: pngpriv.h:464
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Definition: textedit.cpp:22
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Definition: wbemdisp.c:287
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Definition: pngpriv.h:469
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Definition: zlib.h:309
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Definition: glext.h:5919
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Definition: pngconf.h:580
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Definition: pngconf.h:586
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Definition: png.h:1939
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Definition: pngpriv.h:380
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Definition: pngconf.h:612
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Definition: gl.h:1950
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Definition: gl.h:1545
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Definition: png.h:469
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Definition: pngpriv.h:1818
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Definition: _list.h:228
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Definition: pngconf.h:308
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Definition: clipboard.c:1345
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Definition: atltest.h:64
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Definition: glext.h:9613
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Definition: pngpriv.h:354
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Definition: glext.h:8902
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Definition: page1.c:45
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struct png_info_def *typedef unsigned char **typedef struct png_info_def *typedef struct png_info_def *typedef struct png_info_def *typedef unsigned char ** row
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