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1
2/* pngpriv.h - private declarations for use inside libpng
3 *
4 * Copyright (c) 2018-2019 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#ifdef _MSC_VER
27# ifndef _CRT_SECURE_NO_DEPRECATE
28# define _CRT_SECURE_NO_DEPRECATE
29# endif
30#endif
31
32/* Feature Test Macros. The following are defined here to ensure that correctly
33 * implemented libraries reveal the APIs libpng needs to build and hide those
34 * that are not needed and potentially damaging to the compilation.
35 *
36 * Feature Test Macros must be defined before any system header is included (see
37 * POSIX 1003.1 2.8.2 "POSIX Symbols."
38 *
39 * These macros only have an effect if the operating system supports either
40 * POSIX 1003.1 or C99, or both. On other operating systems (particularly
41 * Windows/Visual Studio) there is no effect; the OS specific tests below are
42 * still required (as of 2011-05-02.)
43 */
44#ifndef _POSIX_SOURCE
45# define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */
46#endif
47
48#ifndef PNG_VERSION_INFO_ONLY
49/* Standard library headers not required by png.h: */
50# include <stdlib.h>
51# include <string.h>
52#endif
53
54#define PNGLIB_BUILD /*libpng is being built, not used*/
55
56/* If HAVE_CONFIG_H is defined during the build then the build system must
57 * provide an appropriate "config.h" file on the include path. The header file
58 * must provide definitions as required below (search for "HAVE_CONFIG_H");
59 * see configure.ac for more details of the requirements. The macro
60 * "PNG_NO_CONFIG_H" is provided for maintainers to test for dependencies on
61 * 'configure'; define this macro to prevent the configure build including the
62 * configure generated config.h. Libpng is expected to compile without *any*
63 * special build system support on a reasonably ANSI-C compliant system.
64 */
65#if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H)
66# include <config.h>
67
68 /* Pick up the definition of 'restrict' from config.h if it was read: */
69# define PNG_RESTRICT restrict
70#endif
71
72/* To support symbol prefixing it is necessary to know *before* including png.h
73 * whether the fixed point (and maybe other) APIs are exported, because if they
74 * are not internal definitions may be required. This is handled below just
75 * before png.h is included, but load the configuration now if it is available.
76 */
77#ifndef PNGLCONF_H
78# include "pnglibconf.h"
79#endif
80
81/* Local renames may change non-exported API functions from png.h */
82#if defined(PNG_PREFIX) && !defined(PNGPREFIX_H)
83# include "pngprefix.h"
84#endif
85
86#ifdef PNG_USER_CONFIG
87# include "pngusr.h"
88 /* These should have been defined in pngusr.h */
89# ifndef PNG_USER_PRIVATEBUILD
90# define PNG_USER_PRIVATEBUILD "Custom libpng build"
91# endif
92# ifndef PNG_USER_DLLFNAME_POSTFIX
93# define PNG_USER_DLLFNAME_POSTFIX "Cb"
94# endif
95#endif
96
97/* Compile time options.
98 * =====================
99 * In a multi-arch build the compiler may compile the code several times for the
100 * same object module, producing different binaries for different architectures.
101 * When this happens configure-time setting of the target host options cannot be
102 * done and this interferes with the handling of the ARM NEON optimizations, and
103 * possibly other similar optimizations. Put additional tests here; in general
104 * this is needed when the same option can be changed at both compile time and
105 * run time depending on the target OS (i.e. iOS vs Android.)
106 *
107 * NOTE: symbol prefixing does not pass $(CFLAGS) to the preprocessor, because
108 * this is not possible with certain compilers (Oracle SUN OS CC), as a result
109 * it is necessary to ensure that all extern functions that *might* be used
110 * regardless of $(CFLAGS) get declared in this file. The test on __ARM_NEON__
111 * below is one example of this behavior because it is controlled by the
112 * presence or not of -mfpu=neon on the GCC command line, it is possible to do
113 * this in $(CC), e.g. "CC=gcc -mfpu=neon", but people who build libpng rarely
114 * do this.
115 */
116#ifndef PNG_ARM_NEON_OPT
117 /* ARM NEON optimizations are being controlled by the compiler settings,
118 * typically the target FPU. If the FPU has been set to NEON (-mfpu=neon
119 * with GCC) then the compiler will define __ARM_NEON__ and we can rely
120 * unconditionally on NEON instructions not crashing, otherwise we must
121 * disable use of NEON instructions.
122 *
123 * NOTE: at present these optimizations depend on 'ALIGNED_MEMORY', so they
124 * can only be turned on automatically if that is supported too. If
125 * PNG_ARM_NEON_OPT is set in CPPFLAGS (to >0) then arm/arm_init.c will fail
126 * to compile with an appropriate #error if ALIGNED_MEMORY has been turned
127 * off.
128 *
129 * Note that gcc-4.9 defines __ARM_NEON instead of the deprecated
130 * __ARM_NEON__, so we check both variants.
131 *
132 * To disable ARM_NEON optimizations entirely, and skip compiling the
133 * associated assembler code, pass --enable-arm-neon=no to configure
134 * or put -DPNG_ARM_NEON_OPT=0 in CPPFLAGS.
135 */
136# if (defined(__ARM_NEON__) || defined(__ARM_NEON)) && \
137 defined(PNG_ALIGNED_MEMORY_SUPPORTED)
138# define PNG_ARM_NEON_OPT 2
139# else
140# define PNG_ARM_NEON_OPT 0
141# endif
142#endif
143
144#if PNG_ARM_NEON_OPT > 0
145 /* NEON optimizations are to be at least considered by libpng, so enable the
146 * callbacks to do this.
147 */
148# define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_neon
149
150 /* By default the 'intrinsics' code in arm/filter_neon_intrinsics.c is used
151 * if possible - if __ARM_NEON__ is set and the compiler version is not known
152 * to be broken. This is controlled by PNG_ARM_NEON_IMPLEMENTATION which can
153 * be:
154 *
155 * 1 The intrinsics code (the default with __ARM_NEON__)
156 * 2 The hand coded assembler (the default without __ARM_NEON__)
157 *
158 * It is possible to set PNG_ARM_NEON_IMPLEMENTATION in CPPFLAGS, however
159 * this is *NOT* supported and may cease to work even after a minor revision
160 * to libpng. It *is* valid to do this for testing purposes, e.g. speed
161 * testing or a new compiler, but the results should be communicated to the
162 * libpng implementation list for incorporation in the next minor release.
163 */
164# ifndef PNG_ARM_NEON_IMPLEMENTATION
165# if defined(__ARM_NEON__) || defined(__ARM_NEON)
166# if defined(__clang__)
167 /* At present it is unknown by the libpng developers which versions
168 * of clang support the intrinsics, however some or perhaps all
169 * versions do not work with the assembler so this may be
170 * irrelevant, so just use the default (do nothing here.)
171 */
172# elif defined(__GNUC__)
173 /* GCC 4.5.4 NEON support is known to be broken. 4.6.3 is known to
174 * work, so if this *is* GCC, or G++, look for a version >4.5
175 */
176# if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)
177# define PNG_ARM_NEON_IMPLEMENTATION 2
178# endif /* no GNUC support */
179# endif /* __GNUC__ */
180# else /* !defined __ARM_NEON__ */
181 /* The 'intrinsics' code simply won't compile without this -mfpu=neon:
182 */
183# if !defined(__aarch64__)
184 /* The assembler code currently does not work on ARM64 */
185# define PNG_ARM_NEON_IMPLEMENTATION 2
186# endif /* __aarch64__ */
187# endif /* __ARM_NEON__ */
188# endif /* !PNG_ARM_NEON_IMPLEMENTATION */
189
190# ifndef PNG_ARM_NEON_IMPLEMENTATION
191 /* Use the intrinsics code by default. */
192# define PNG_ARM_NEON_IMPLEMENTATION 1
193# endif
194#endif /* PNG_ARM_NEON_OPT > 0 */
195
196#ifndef PNG_MIPS_MSA_OPT
197# if defined(__mips_msa) && (__mips_isa_rev >= 5) && defined(PNG_ALIGNED_MEMORY_SUPPORTED)
198# define PNG_MIPS_MSA_OPT 2
199# else
200# define PNG_MIPS_MSA_OPT 0
201# endif
202#endif
203
204#ifndef PNG_POWERPC_VSX_OPT
205# if defined(__PPC64__) && defined(__ALTIVEC__) && defined(__VSX__)
206# define PNG_POWERPC_VSX_OPT 2
207# else
208# define PNG_POWERPC_VSX_OPT 0
209# endif
210#endif
211
212#ifndef PNG_INTEL_SSE_OPT
213# ifdef PNG_INTEL_SSE
214 /* Only check for SSE if the build configuration has been modified to
215 * enable SSE optimizations. This means that these optimizations will
216 * be off by default. See contrib/intel for more details.
217 */
218# if defined(__SSE4_1__) || defined(__AVX__) || defined(__SSSE3__) || \
219 defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \
220 (defined(_M_IX86_FP) && _M_IX86_FP >= 2)
221# define PNG_INTEL_SSE_OPT 1
222# else
223# define PNG_INTEL_SSE_OPT 0
224# endif
225# else
226# define PNG_INTEL_SSE_OPT 0
227# endif
228#endif
229
230#if PNG_INTEL_SSE_OPT > 0
231# ifndef PNG_INTEL_SSE_IMPLEMENTATION
232# if defined(__SSE4_1__) || defined(__AVX__)
233 /* We are not actually using AVX, but checking for AVX is the best
234 way we can detect SSE4.1 and SSSE3 on MSVC.
235 */
236# define PNG_INTEL_SSE_IMPLEMENTATION 3
237# elif defined(__SSSE3__)
238# define PNG_INTEL_SSE_IMPLEMENTATION 2
239# elif defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \
240 (defined(_M_IX86_FP) && _M_IX86_FP >= 2)
241# define PNG_INTEL_SSE_IMPLEMENTATION 1
242# else
243# define PNG_INTEL_SSE_IMPLEMENTATION 0
244# endif
245# endif
246
247# if PNG_INTEL_SSE_IMPLEMENTATION > 0
248# define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_sse2
249# endif
250#else
251# define PNG_INTEL_SSE_IMPLEMENTATION 0
252#endif
253
254#if PNG_MIPS_MSA_OPT > 0
255# define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_msa
256# ifndef PNG_MIPS_MSA_IMPLEMENTATION
257# if defined(__mips_msa)
258# if defined(__clang__)
259# elif defined(__GNUC__)
260# if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7)
261# define PNG_MIPS_MSA_IMPLEMENTATION 2
262# endif /* no GNUC support */
263# endif /* __GNUC__ */
264# else /* !defined __mips_msa */
265# define PNG_MIPS_MSA_IMPLEMENTATION 2
266# endif /* __mips_msa */
267# endif /* !PNG_MIPS_MSA_IMPLEMENTATION */
268
269# ifndef PNG_MIPS_MSA_IMPLEMENTATION
270# define PNG_MIPS_MSA_IMPLEMENTATION 1
271# endif
272#endif /* PNG_MIPS_MSA_OPT > 0 */
273
274#if PNG_POWERPC_VSX_OPT > 0
275# define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_vsx
276# define PNG_POWERPC_VSX_IMPLEMENTATION 1
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/* Modfied for usage in Qt: Do not export the libpng APIs */
318#ifdef PNG_BUILD_DLL
319#undef PNG_BUILD_DLL
320#endif
321
322/* See pngconf.h for more details: the builder of the library may set this on
323 * the command line to the right thing for the specific compilation system or it
324 * may be automagically set above (at present we know of no system where it does
325 * need to be set on the command line.)
326 *
327 * PNG_IMPEXP must be set here when building the library to prevent pngconf.h
328 * setting it to the "import" setting for a DLL build.
329 */
330#ifndef PNG_IMPEXP
331# ifdef PNG_BUILD_DLL
332# define PNG_IMPEXP PNG_DLL_EXPORT
333# else
334 /* Not building a DLL, or the DLL doesn't require specific export
335 * definitions.
336 */
337# define PNG_IMPEXP
338# endif
339#endif
340
341/* No warnings for private or deprecated functions in the build: */
342#ifndef PNG_DEPRECATED
343# define PNG_DEPRECATED
344#endif
345#ifndef PNG_PRIVATE
346# define PNG_PRIVATE
347#endif
348
349/* Symbol preprocessing support.
350 *
351 * To enable listing global, but internal, symbols the following macros should
352 * always be used to declare an extern data or function object in this file.
353 */
354#ifndef PNG_INTERNAL_DATA
355# define PNG_INTERNAL_DATA(type, name, array) PNG_LINKAGE_DATA type name array
356#endif
357
358#ifndef PNG_INTERNAL_FUNCTION
359# define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\
360 PNG_LINKAGE_FUNCTION PNG_FUNCTION(type, name, args, PNG_EMPTY attributes)
361#endif
362
363#ifndef PNG_INTERNAL_CALLBACK
364# define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\
365 PNG_LINKAGE_CALLBACK PNG_FUNCTION(type, (PNGCBAPI name), args,\
366 PNG_EMPTY attributes)
367#endif
368
369/* If floating or fixed point APIs are disabled they may still be compiled
370 * internally. To handle this make sure they are declared as the appropriate
371 * internal extern function (otherwise the symbol prefixing stuff won't work and
372 * the functions will be used without definitions.)
373 *
374 * NOTE: although all the API functions are declared here they are not all
375 * actually built! Because the declarations are still made it is necessary to
376 * fake out types that they depend on.
377 */
378#ifndef PNG_FP_EXPORT
379# ifndef PNG_FLOATING_POINT_SUPPORTED
380# define PNG_FP_EXPORT(ordinal, type, name, args)\
381 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
382# ifndef PNG_VERSION_INFO_ONLY
383 typedef struct png_incomplete png_double;
384 typedef png_double* png_doublep;
385 typedef const png_double* png_const_doublep;
386 typedef png_double** png_doublepp;
387# endif
388# endif
389#endif
390#ifndef PNG_FIXED_EXPORT
391# ifndef PNG_FIXED_POINT_SUPPORTED
392# define PNG_FIXED_EXPORT(ordinal, type, name, args)\
393 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
394# endif
395#endif
396
397#include "png.h"
398
399/* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */
400#ifndef PNG_DLL_EXPORT
401# define PNG_DLL_EXPORT
402#endif
403
404/* This is a global switch to set the compilation for an installed system
405 * (a release build). It can be set for testing debug builds to ensure that
406 * they will compile when the build type is switched to RC or STABLE, the
407 * default is just to use PNG_LIBPNG_BUILD_BASE_TYPE. Set this in CPPFLAGS
408 * with either:
409 *
410 * -DPNG_RELEASE_BUILD Turns on the release compile path
411 * -DPNG_RELEASE_BUILD=0 Turns it off
412 * or in your pngusr.h with
413 * #define PNG_RELEASE_BUILD=1 Turns on the release compile path
414 * #define PNG_RELEASE_BUILD=0 Turns it off
415 */
416#ifndef PNG_RELEASE_BUILD
417# define PNG_RELEASE_BUILD (PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC)
418#endif
419
420/* SECURITY and SAFETY:
421 *
422 * libpng is built with support for internal limits on image dimensions and
423 * memory usage. These are documented in scripts/pnglibconf.dfa of the
424 * source and recorded in the machine generated header file pnglibconf.h.
425 */
426
427/* If you are running on a machine where you cannot allocate more
428 * than 64K of memory at once, uncomment this. While libpng will not
429 * normally need that much memory in a chunk (unless you load up a very
430 * large file), zlib needs to know how big of a chunk it can use, and
431 * libpng thus makes sure to check any memory allocation to verify it
432 * will fit into memory.
433 *
434 * zlib provides 'MAXSEG_64K' which, if defined, indicates the
435 * same limit and pngconf.h (already included) sets the limit
436 * if certain operating systems are detected.
437 */
438#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
439# define PNG_MAX_MALLOC_64K
440#endif
441
442#ifndef PNG_UNUSED
443/* Unused formal parameter warnings are silenced using the following macro
444 * which is expected to have no bad effects on performance (optimizing
445 * compilers will probably remove it entirely). Note that if you replace
446 * it with something other than whitespace, you must include the terminating
447 * semicolon.
448 */
449# define PNG_UNUSED(param) (void)param;
450#endif
451
452/* Just a little check that someone hasn't tried to define something
453 * contradictory.
454 */
455#if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K)
456# undef PNG_ZBUF_SIZE
457# define PNG_ZBUF_SIZE 65536L
458#endif
459
460/* If warnings or errors are turned off the code is disabled or redirected here.
461 * From 1.5.4 functions have been added to allow very limited formatting of
462 * error and warning messages - this code will also be disabled here.
463 */
464#ifdef PNG_WARNINGS_SUPPORTED
465# define PNG_WARNING_PARAMETERS(p) png_warning_parameters p;
466#else
467# define png_warning_parameter(p,number,string) ((void)0)
468# define png_warning_parameter_unsigned(p,number,format,value) ((void)0)
469# define png_warning_parameter_signed(p,number,format,value) ((void)0)
470# define png_formatted_warning(pp,p,message) ((void)(pp))
471# define PNG_WARNING_PARAMETERS(p)
472#endif
473#ifndef PNG_ERROR_TEXT_SUPPORTED
474# define png_fixed_error(s1,s2) png_err(s1)
475#endif
476
477/* Some fixed point APIs are still required even if not exported because
478 * they get used by the corresponding floating point APIs. This magic
479 * deals with this:
480 */
481#ifdef PNG_FIXED_POINT_SUPPORTED
482# define PNGFAPI PNGAPI
483#else
484# define PNGFAPI /* PRIVATE */
485#endif
486
487#ifndef PNG_VERSION_INFO_ONLY
488/* Other defines specific to compilers can go here. Try to keep
489 * them inside an appropriate ifdef/endif pair for portability.
490 */
491
492/* C allows up-casts from (void*) to any pointer and (const void*) to any
493 * pointer to a const object. C++ regards this as a type error and requires an
494 * explicit, static, cast and provides the static_cast<> rune to ensure that
495 * const is not cast away.
496 */
497#ifdef __cplusplus
498# define png_voidcast(type, value) static_cast<type>(value)
499# define png_constcast(type, value) const_cast<type>(value)
500# define png_aligncast(type, value) \
501 static_cast<type>(static_cast<void*>(value))
502# define png_aligncastconst(type, value) \
503 static_cast<type>(static_cast<const void*>(value))
504#else
505# define png_voidcast(type, value) (value)
506# ifdef _WIN64
507# ifdef __GNUC__
508 typedef unsigned long long png_ptruint;
509# else
510 typedef unsigned __int64 png_ptruint;
511# endif
512# else
513 typedef unsigned long png_ptruint;
514# endif
515# define png_constcast(type, value) ((type)(png_ptruint)(const void*)(value))
516# define png_aligncast(type, value) ((void*)(value))
517# define png_aligncastconst(type, value) ((const void*)(value))
518#endif /* __cplusplus */
519
520#if defined(PNG_FLOATING_POINT_SUPPORTED) ||\
521 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
522 /* png.c requires the following ANSI-C constants if the conversion of
523 * floating point to ASCII is implemented therein:
524 *
525 * DBL_DIG Maximum number of decimal digits (can be set to any constant)
526 * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value)
527 * DBL_MAX Maximum floating point number (can be set to an arbitrary value)
528 */
529# include <float.h>
530
531# if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
532 defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
533 /* We need to check that <math.h> hasn't already been included earlier
534 * as it seems it doesn't agree with <fp.h>, yet we should really use
535 * <fp.h> if possible.
536 */
537# if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
538# include <fp.h>
539# endif
540# else
541# include <math.h>
542# endif
543# if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
544 /* Amiga SAS/C: We must include builtin FPU functions when compiling using
545 * MATH=68881
546 */
547# include <m68881.h>
548# endif
549#endif
550
551/* This provides the non-ANSI (far) memory allocation routines. */
552#if defined(__TURBOC__) && defined(__MSDOS__)
553# include <mem.h>
554# include <alloc.h>
555#endif
556
557#if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \
558 defined(_WIN32) || defined(__WIN32__)
559# include <windows.h> /* defines _WINDOWS_ macro */
560# if defined(WINAPI_FAMILY) && (WINAPI_FAMILY==WINAPI_FAMILY_APP || WINAPI_FAMILY==WINAPI_FAMILY_PHONE_APP)
561# define _WINRT_ /* Define a macro for Windows Runtime builds */
562# endif
563#endif
564#endif /* PNG_VERSION_INFO_ONLY */
565
566/* Moved here around 1.5.0beta36 from pngconf.h */
567/* Users may want to use these so they are not private. Any library
568 * functions that are passed far data must be model-independent.
569 */
570
571/* Memory model/platform independent fns */
572#ifndef PNG_ABORT
573# if (defined(_WINDOWS_) || defined(_WIN32_WCE)) && !defined(_WINRT_)
574# define PNG_ABORT() ExitProcess(0)
575# else
576# define PNG_ABORT() abort()
577# endif
578#endif
579
580/* These macros may need to be architecture dependent. */
581#define PNG_ALIGN_NONE 0 /* do not use data alignment */
582#define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */
583#ifdef offsetof
584# define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */
585#else
586# define PNG_ALIGN_OFFSET -1 /* prevent the use of this */
587#endif
588#define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */
589
590#ifndef PNG_ALIGN_TYPE
591 /* Default to using aligned access optimizations and requiring alignment to a
592 * multiple of the data type size. Override in a compiler specific fashion
593 * if necessary by inserting tests here:
594 */
595# define PNG_ALIGN_TYPE PNG_ALIGN_SIZE
596#endif
597
598#if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE
599 /* This is used because in some compiler implementations non-aligned
600 * structure members are supported, so the offsetof approach below fails.
601 * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access
602 * is good for performance. Do not do this unless you have tested the result
603 * and understand it.
604 */
605# define png_alignof(type) (sizeof (type))
606#else
607# if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET
608# define png_alignof(type) offsetof(struct{char c; type t;}, t)
609# else
610# if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS
611# define png_alignof(type) (1)
612# endif
613 /* Else leave png_alignof undefined to prevent use thereof */
614# endif
615#endif
616
617/* This implicitly assumes alignment is always to a power of 2. */
618#ifdef png_alignof
619# define png_isaligned(ptr, type)\
620 (((type)((const char*)ptr-(const char*)0) & \
621 (type)(png_alignof(type)-1)) == 0)
622#else
623# define png_isaligned(ptr, type) 0
624#endif
625
626/* End of memory model/platform independent support */
627/* End of 1.5.0beta36 move from pngconf.h */
628
629/* CONSTANTS and UTILITY MACROS
630 * These are used internally by libpng and not exposed in the API
631 */
632
633/* Various modes of operation. Note that after an init, mode is set to
634 * zero automatically when the structure is created. Three of these
635 * are defined in png.h because they need to be visible to applications
636 * that call png_set_unknown_chunk().
637 */
638/* #define PNG_HAVE_IHDR 0x01U (defined in png.h) */
639/* #define PNG_HAVE_PLTE 0x02U (defined in png.h) */
640#define PNG_HAVE_IDAT 0x04U
641/* #define PNG_AFTER_IDAT 0x08U (defined in png.h) */
642#define PNG_HAVE_IEND 0x10U
643 /* 0x20U (unused) */
644 /* 0x40U (unused) */
645 /* 0x80U (unused) */
646#define PNG_HAVE_CHUNK_HEADER 0x100U
647#define PNG_WROTE_tIME 0x200U
648#define PNG_WROTE_INFO_BEFORE_PLTE 0x400U
649#define PNG_BACKGROUND_IS_GRAY 0x800U
650#define PNG_HAVE_PNG_SIGNATURE 0x1000U
651#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000U /* Have another chunk after IDAT */
652 /* 0x4000U (unused) */
653#define PNG_IS_READ_STRUCT 0x8000U /* Else is a write struct */
654
655/* Flags for the transformations the PNG library does on the image data */
656#define PNG_BGR 0x0001U
657#define PNG_INTERLACE 0x0002U
658#define PNG_PACK 0x0004U
659#define PNG_SHIFT 0x0008U
660#define PNG_SWAP_BYTES 0x0010U
661#define PNG_INVERT_MONO 0x0020U
662#define PNG_QUANTIZE 0x0040U
663#define PNG_COMPOSE 0x0080U /* Was PNG_BACKGROUND */
664#define PNG_BACKGROUND_EXPAND 0x0100U
665#define PNG_EXPAND_16 0x0200U /* Added to libpng 1.5.2 */
666#define PNG_16_TO_8 0x0400U /* Becomes 'chop' in 1.5.4 */
667#define PNG_RGBA 0x0800U
668#define PNG_EXPAND 0x1000U
669#define PNG_GAMMA 0x2000U
670#define PNG_GRAY_TO_RGB 0x4000U
671#define PNG_FILLER 0x8000U
672#define PNG_PACKSWAP 0x10000U
673#define PNG_SWAP_ALPHA 0x20000U
674#define PNG_STRIP_ALPHA 0x40000U
675#define PNG_INVERT_ALPHA 0x80000U
676#define PNG_USER_TRANSFORM 0x100000U
677#define PNG_RGB_TO_GRAY_ERR 0x200000U
678#define PNG_RGB_TO_GRAY_WARN 0x400000U
679#define PNG_RGB_TO_GRAY 0x600000U /* two bits, RGB_TO_GRAY_ERR|WARN */
680#define PNG_ENCODE_ALPHA 0x800000U /* Added to libpng-1.5.4 */
681#define PNG_ADD_ALPHA 0x1000000U /* Added to libpng-1.2.7 */
682#define PNG_EXPAND_tRNS 0x2000000U /* Added to libpng-1.2.9 */
683#define PNG_SCALE_16_TO_8 0x4000000U /* Added to libpng-1.5.4 */
684 /* 0x8000000U unused */
685 /* 0x10000000U unused */
686 /* 0x20000000U unused */
687 /* 0x40000000U unused */
688/* Flags for png_create_struct */
689#define PNG_STRUCT_PNG 0x0001U
690#define PNG_STRUCT_INFO 0x0002U
691
692/* Flags for the png_ptr->flags rather than declaring a byte for each one */
693#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001U
694#define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002U /* Added to libpng-1.6.0 */
695 /* 0x0004U unused */
696#define PNG_FLAG_ZSTREAM_ENDED 0x0008U /* Added to libpng-1.6.0 */
697 /* 0x0010U unused */
698 /* 0x0020U unused */
699#define PNG_FLAG_ROW_INIT 0x0040U
700#define PNG_FLAG_FILLER_AFTER 0x0080U
701#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100U
702#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200U
703#define PNG_FLAG_CRC_CRITICAL_USE 0x0400U
704#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800U
705#define PNG_FLAG_ASSUME_sRGB 0x1000U /* Added to libpng-1.5.4 */
706#define PNG_FLAG_OPTIMIZE_ALPHA 0x2000U /* Added to libpng-1.5.4 */
707#define PNG_FLAG_DETECT_UNINITIALIZED 0x4000U /* Added to libpng-1.5.4 */
708/* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000U */
709/* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000U */
710#define PNG_FLAG_LIBRARY_MISMATCH 0x20000U
711#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000U
712#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000U
713#define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000U /* Added to libpng-1.4.0 */
714#define PNG_FLAG_APP_WARNINGS_WARN 0x200000U /* Added to libpng-1.6.0 */
715#define PNG_FLAG_APP_ERRORS_WARN 0x400000U /* Added to libpng-1.6.0 */
716 /* 0x800000U unused */
717 /* 0x1000000U unused */
718 /* 0x2000000U unused */
719 /* 0x4000000U unused */
720 /* 0x8000000U unused */
721 /* 0x10000000U unused */
722 /* 0x20000000U unused */
723 /* 0x40000000U unused */
724
725#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
726 PNG_FLAG_CRC_ANCILLARY_NOWARN)
727
728#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
729 PNG_FLAG_CRC_CRITICAL_IGNORE)
730
731#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
732 PNG_FLAG_CRC_CRITICAL_MASK)
733
734/* Save typing and make code easier to understand */
735
736#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
737 abs((int)((c1).green) - (int)((c2).green)) + \
738 abs((int)((c1).blue) - (int)((c2).blue)))
739
740/* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255
741 * by dividing by 257 *with rounding*. This macro is exact for the given range.
742 * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the
743 * macro were established by experiment (modifying the added value). The macro
744 * has a second variant that takes a value already scaled by 255 and divides by
745 * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it
746 * only gives off-by-one errors and only for 0.5% (1 in 200) of the values.
747 */
748#define PNG_DIV65535(v24) (((v24) + 32895) >> 16)
749#define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255)
750
751/* Added to libpng-1.2.6 JB */
752#define PNG_ROWBYTES(pixel_bits, width) \
753 ((pixel_bits) >= 8 ? \
754 ((size_t)(width) * (((size_t)(pixel_bits)) >> 3)) : \
755 (( ((size_t)(width) * ((size_t)(pixel_bits))) + 7) >> 3) )
756
757/* This returns the number of trailing bits in the last byte of a row, 0 if the
758 * last byte is completely full of pixels. It is, in principle, (pixel_bits x
759 * width) % 8, but that would overflow for large 'width'. The second macro is
760 * the same except that it returns the number of unused bits in the last byte;
761 * (8-TRAILBITS), but 0 when TRAILBITS is 0.
762 *
763 * NOTE: these macros are intended to be self-evidently correct and never
764 * overflow on the assumption that pixel_bits is in the range 0..255. The
765 * arguments are evaluated only once and they can be signed (e.g. as a result of
766 * the integral promotions). The result of the expression always has type
767 * (png_uint_32), however the compiler always knows it is in the range 0..7.
768 */
769#define PNG_TRAILBITS(pixel_bits, width) \
770 (((pixel_bits) * ((width) % (png_uint_32)8)) % 8)
771
772#define PNG_PADBITS(pixel_bits, width) \
773 ((8 - PNG_TRAILBITS(pixel_bits, width)) % 8)
774
775/* PNG_OUT_OF_RANGE returns true if value is outside the range
776 * ideal-delta..ideal+delta. Each argument is evaluated twice.
777 * "ideal" and "delta" should be constants, normally simple
778 * integers, "value" a variable. Added to libpng-1.2.6 JB
779 */
780#define PNG_OUT_OF_RANGE(value, ideal, delta) \
781 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
782
783/* Conversions between fixed and floating point, only defined if
784 * required (to make sure the code doesn't accidentally use float
785 * when it is supposedly disabled.)
786 */
787#ifdef PNG_FLOATING_POINT_SUPPORTED
788/* The floating point conversion can't overflow, though it can and
789 * does lose accuracy relative to the original fixed point value.
790 * In practice this doesn't matter because png_fixed_point only
791 * stores numbers with very low precision. The png_ptr and s
792 * arguments are unused by default but are there in case error
793 * checking becomes a requirement.
794 */
795#define png_float(png_ptr, fixed, s) (.00001 * (fixed))
796
797/* The fixed point conversion performs range checking and evaluates
798 * its argument multiple times, so must be used with care. The
799 * range checking uses the PNG specification values for a signed
800 * 32-bit fixed point value except that the values are deliberately
801 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly
802 * (2^31-1) * 100000). 's' is a string that describes the value being
803 * converted.
804 *
805 * NOTE: this macro will raise a png_error if the range check fails,
806 * therefore it is normally only appropriate to use this on values
807 * that come from API calls or other sources where an out of range
808 * error indicates a programming error, not a data error!
809 *
810 * NOTE: by default this is off - the macro is not used - because the
811 * function call saves a lot of code.
812 */
813#ifdef PNG_FIXED_POINT_MACRO_SUPPORTED
814#define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\
815 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0))
816#endif
817/* else the corresponding function is defined below, inside the scope of the
818 * cplusplus test.
819 */
820#endif
821
822/* Constants for known chunk types. If you need to add a chunk, define the name
823 * here. For historical reasons these constants have the form png_<name>; i.e.
824 * the prefix is lower case. Please use decimal values as the parameters to
825 * match the ISO PNG specification and to avoid relying on the C locale
826 * interpretation of character values.
827 *
828 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values
829 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string
830 * to be generated if required.
831 *
832 * PNG_32b correctly produces a value shifted by up to 24 bits, even on
833 * architectures where (int) is only 16 bits.
834 */
835#define PNG_32b(b,s) ((png_uint_32)(b) << (s))
836#define PNG_U32(b1,b2,b3,b4) \
837 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0))
838
839/* Constants for known chunk types.
840 *
841 * MAINTAINERS: If you need to add a chunk, define the name here.
842 * For historical reasons these constants have the form png_<name>; i.e.
843 * the prefix is lower case. Please use decimal values as the parameters to
844 * match the ISO PNG specification and to avoid relying on the C locale
845 * interpretation of character values. Please keep the list sorted.
846 *
847 * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk
848 * type. In fact the specification does not express chunk types this way,
849 * however using a 32-bit value means that the chunk type can be read from the
850 * stream using exactly the same code as used for a 32-bit unsigned value and
851 * can be examined far more efficiently (using one arithmetic compare).
852 *
853 * Prior to 1.5.6 the chunk type constants were expressed as C strings. The
854 * libpng API still uses strings for 'unknown' chunks and a macro,
855 * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice
856 * that for portable code numeric values must still be used; the string "IHDR"
857 * is not portable and neither is PNG_U32('I', 'H', 'D', 'R').
858 *
859 * In 1.7.0 the definitions will be made public in png.h to avoid having to
860 * duplicate the same definitions in application code.
861 */
862#define png_IDAT PNG_U32( 73, 68, 65, 84)
863#define png_IEND PNG_U32( 73, 69, 78, 68)
864#define png_IHDR PNG_U32( 73, 72, 68, 82)
865#define png_PLTE PNG_U32( 80, 76, 84, 69)
866#define png_bKGD PNG_U32( 98, 75, 71, 68)
867#define png_cHRM PNG_U32( 99, 72, 82, 77)
868#define png_eXIf PNG_U32(101, 88, 73, 102) /* registered July 2017 */
869#define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */
870#define png_gAMA PNG_U32(103, 65, 77, 65)
871#define png_gIFg PNG_U32(103, 73, 70, 103)
872#define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */
873#define png_gIFx PNG_U32(103, 73, 70, 120)
874#define png_hIST PNG_U32(104, 73, 83, 84)
875#define png_iCCP PNG_U32(105, 67, 67, 80)
876#define png_iTXt PNG_U32(105, 84, 88, 116)
877#define png_oFFs PNG_U32(111, 70, 70, 115)
878#define png_pCAL PNG_U32(112, 67, 65, 76)
879#define png_pHYs PNG_U32(112, 72, 89, 115)
880#define png_sBIT PNG_U32(115, 66, 73, 84)
881#define png_sCAL PNG_U32(115, 67, 65, 76)
882#define png_sPLT PNG_U32(115, 80, 76, 84)
883#define png_sRGB PNG_U32(115, 82, 71, 66)
884#define png_sTER PNG_U32(115, 84, 69, 82)
885#define png_tEXt PNG_U32(116, 69, 88, 116)
886#define png_tIME PNG_U32(116, 73, 77, 69)
887#define png_tRNS PNG_U32(116, 82, 78, 83)
888#define png_zTXt PNG_U32(122, 84, 88, 116)
889
890/* The following will work on (signed char*) strings, whereas the get_uint_32
891 * macro will fail on top-bit-set values because of the sign extension.
892 */
893#define PNG_CHUNK_FROM_STRING(s)\
894 PNG_U32(0xff & (s)[0], 0xff & (s)[1], 0xff & (s)[2], 0xff & (s)[3])
895
896/* This uses (char), not (png_byte) to avoid warnings on systems where (char) is
897 * signed and the argument is a (char[]) This macro will fail miserably on
898 * systems where (char) is more than 8 bits.
899 */
900#define PNG_STRING_FROM_CHUNK(s,c)\
901 (void)(((char*)(s))[0]=(char)(((c)>>24) & 0xff), \
902 ((char*)(s))[1]=(char)(((c)>>16) & 0xff),\
903 ((char*)(s))[2]=(char)(((c)>>8) & 0xff), \
904 ((char*)(s))[3]=(char)((c & 0xff)))
905
906/* Do the same but terminate with a null character. */
907#define PNG_CSTRING_FROM_CHUNK(s,c)\
908 (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0)
909
910/* Test on flag values as defined in the spec (section 5.4): */
911#define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29))
912#define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c))
913#define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21))
914#define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13))
915#define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5))
916
917/* Gamma values (new at libpng-1.5.4): */
918#define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */
919#define PNG_GAMMA_MAC_INVERSE 65909
920#define PNG_GAMMA_sRGB_INVERSE 45455
921
922/* Almost everything below is C specific; the #defines above can be used in
923 * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot.
924 */
925#ifndef PNG_VERSION_INFO_ONLY
926
927#include "pngstruct.h"
928#include "pnginfo.h"
929
930/* Validate the include paths - the include path used to generate pnglibconf.h
931 * must match that used in the build, or we must be using pnglibconf.h.prebuilt:
932 */
933#if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM
934# error ZLIB_VERNUM != PNG_ZLIB_VERNUM \
935 "-I (include path) error: see the notes in pngpriv.h"
936 /* This means that when pnglibconf.h was built the copy of zlib.h that it
937 * used is not the same as the one being used here. Because the build of
938 * libpng makes decisions to use inflateInit2 and inflateReset2 based on the
939 * zlib version number and because this affects handling of certain broken
940 * PNG files the -I directives must match.
941 *
942 * The most likely explanation is that you passed a -I in CFLAGS. This will
943 * not work; all the preprocessor directives and in particular all the -I
944 * directives must be in CPPFLAGS.
945 */
946#endif
947
948/* This is used for 16-bit gamma tables -- only the top level pointers are
949 * const; this could be changed:
950 */
951typedef const png_uint_16p * png_const_uint_16pp;
952
953/* Added to libpng-1.5.7: sRGB conversion tables */
954#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
955 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
956#ifdef PNG_SIMPLIFIED_READ_SUPPORTED
957PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]);
958 /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value,
959 * 0..65535. This table gives the closest 16-bit answers (no errors).
960 */
961#endif
962
963PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]);
964PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]);
965
966#define PNG_sRGB_FROM_LINEAR(linear) \
967 ((png_byte)(0xff & ((png_sRGB_base[(linear)>>15] \
968 + ((((linear) & 0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8)))
969 /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB
970 * encoded value with maximum error 0.646365. Note that the input is not a
971 * 16-bit value; it has been multiplied by 255! */
972#endif /* SIMPLIFIED_READ/WRITE */
973
974
975/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
976#ifdef __cplusplus
977extern "C" {
978#endif /* __cplusplus */
979
980/* Internal functions; these are not exported from a DLL however because they
981 * are used within several of the C source files they have to be C extern.
982 *
983 * All of these functions must be declared with PNG_INTERNAL_FUNCTION.
984 */
985
986/* Zlib support */
987#define PNG_UNEXPECTED_ZLIB_RETURN (-7)
988PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret),
989 PNG_EMPTY);
990 /* Used by the zlib handling functions to ensure that z_stream::msg is always
991 * set before they return.
992 */
993
994#ifdef PNG_WRITE_SUPPORTED
995PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr,
996 png_compression_bufferp *list),PNG_EMPTY);
997 /* Free the buffer list used by the compressed write code. */
998#endif
999
1000#if defined(PNG_FLOATING_POINT_SUPPORTED) && \
1001 !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \
1002 (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \
1003 defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \
1004 defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \
1005 (defined(PNG_sCAL_SUPPORTED) && \
1006 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED))
1007PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr,
1008 double fp, png_const_charp text),PNG_EMPTY);
1009#endif
1010
1011/* Check the user version string for compatibility, returns false if the version
1012 * numbers aren't compatible.
1013 */
1014PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr,
1015 png_const_charp user_png_ver),PNG_EMPTY);
1016
1017/* Internal base allocator - no messages, NULL on failure to allocate. This
1018 * does, however, call the application provided allocator and that could call
1019 * png_error (although that would be a bug in the application implementation.)
1020 */
1021PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr,
1022 png_alloc_size_t size),PNG_ALLOCATED);
1023
1024#if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\
1025 defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED)
1026/* Internal array allocator, outputs no error or warning messages on failure,
1027 * just returns NULL.
1028 */
1029PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr,
1030 int nelements, size_t element_size),PNG_ALLOCATED);
1031
1032/* The same but an existing array is extended by add_elements. This function
1033 * also memsets the new elements to 0 and copies the old elements. The old
1034 * array is not freed or altered.
1035 */
1036PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr,
1037 png_const_voidp array, int old_elements, int add_elements,
1038 size_t element_size),PNG_ALLOCATED);
1039#endif /* text, sPLT or unknown chunks */
1040
1041/* Magic to create a struct when there is no struct to call the user supplied
1042 * memory allocators. Because error handling has not been set up the memory
1043 * handlers can't safely call png_error, but this is an obscure and undocumented
1044 * restriction so libpng has to assume that the 'free' handler, at least, might
1045 * call png_error.
1046 */
1047PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct,
1048 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
1049 png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn,
1050 png_free_ptr free_fn),PNG_ALLOCATED);
1051
1052/* Free memory from internal libpng struct */
1053PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr),
1054 PNG_EMPTY);
1055
1056/* Free an allocated jmp_buf (always succeeds) */
1057PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY);
1058
1059/* Function to allocate memory for zlib. PNGAPI is disallowed. */
1060PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size),
1061 PNG_ALLOCATED);
1062
1063/* Function to free memory for zlib. PNGAPI is disallowed. */
1064PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY);
1065
1066/* Next four functions are used internally as callbacks. PNGCBAPI is required
1067 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to
1068 * PNGCBAPI at 1.5.0
1069 */
1070
1071PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr,
1072 png_bytep data, size_t length),PNG_EMPTY);
1073
1074#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1075PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr,
1076 png_bytep buffer, size_t length),PNG_EMPTY);
1077#endif
1078
1079PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr,
1080 png_bytep data, size_t length),PNG_EMPTY);
1081
1082#ifdef PNG_WRITE_FLUSH_SUPPORTED
1083# ifdef PNG_STDIO_SUPPORTED
1084PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr),
1085 PNG_EMPTY);
1086# endif
1087#endif
1088
1089/* Reset the CRC variable */
1090PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY);
1091
1092/* Write the "data" buffer to whatever output you are using */
1093PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr,
1094 png_const_bytep data, size_t length),PNG_EMPTY);
1095
1096/* Read and check the PNG file signature */
1097PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr,
1098 png_inforp info_ptr),PNG_EMPTY);
1099
1100/* Read the chunk header (length + type name) */
1101PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr),
1102 PNG_EMPTY);
1103
1104/* Read data from whatever input you are using into the "data" buffer */
1105PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data,
1106 size_t length),PNG_EMPTY);
1107
1108/* Read bytes into buf, and update png_ptr->crc */
1109PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf,
1110 png_uint_32 length),PNG_EMPTY);
1111
1112/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
1113PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr,
1114 png_uint_32 skip),PNG_EMPTY);
1115
1116/* Read the CRC from the file and compare it to the libpng calculated CRC */
1117PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY);
1118
1119/* Calculate the CRC over a section of data. Note that we are only
1120 * passing a maximum of 64K on systems that have this as a memory limit,
1121 * since this is the maximum buffer size we can specify.
1122 */
1123PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr,
1124 png_const_bytep ptr, size_t length),PNG_EMPTY);
1125
1126#ifdef PNG_WRITE_FLUSH_SUPPORTED
1127PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY);
1128#endif
1129
1130/* Write various chunks */
1131
1132/* Write the IHDR chunk, and update the png_struct with the necessary
1133 * information.
1134 */
1135PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr,
1136 png_uint_32 width, png_uint_32 height, int bit_depth, int color_type,
1137 int compression_method, int filter_method, int interlace_method),PNG_EMPTY);
1138
1139PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr,
1140 png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY);
1141
1142PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr,
1143 png_const_bytep row_data, png_alloc_size_t row_data_length, int flush),
1144 PNG_EMPTY);
1145
1146PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY);
1147
1148#ifdef PNG_WRITE_gAMA_SUPPORTED
1149PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr,
1150 png_fixed_point file_gamma),PNG_EMPTY);
1151#endif
1152
1153#ifdef PNG_WRITE_sBIT_SUPPORTED
1154PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr,
1155 png_const_color_8p sbit, int color_type),PNG_EMPTY);
1156#endif
1157
1158#ifdef PNG_WRITE_cHRM_SUPPORTED
1159PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr,
1160 const png_xy *xy), PNG_EMPTY);
1161 /* The xy value must have been previously validated */
1162#endif
1163
1164#ifdef PNG_WRITE_sRGB_SUPPORTED
1165PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr,
1166 int intent),PNG_EMPTY);
1167#endif
1168
1169#ifdef PNG_WRITE_eXIf_SUPPORTED
1170PNG_INTERNAL_FUNCTION(void,png_write_eXIf,(png_structrp png_ptr,
1171 png_bytep exif, int num_exif),PNG_EMPTY);
1172#endif
1173
1174#ifdef PNG_WRITE_iCCP_SUPPORTED
1175PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr,
1176 png_const_charp name, png_const_bytep profile), PNG_EMPTY);
1177 /* The profile must have been previously validated for correctness, the
1178 * length comes from the first four bytes. Only the base, deflate,
1179 * compression is supported.
1180 */
1181#endif
1182
1183#ifdef PNG_WRITE_sPLT_SUPPORTED
1184PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr,
1185 png_const_sPLT_tp palette),PNG_EMPTY);
1186#endif
1187
1188#ifdef PNG_WRITE_tRNS_SUPPORTED
1189PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr,
1190 png_const_bytep trans, png_const_color_16p values, int number,
1191 int color_type),PNG_EMPTY);
1192#endif
1193
1194#ifdef PNG_WRITE_bKGD_SUPPORTED
1195PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr,
1196 png_const_color_16p values, int color_type),PNG_EMPTY);
1197#endif
1198
1199#ifdef PNG_WRITE_hIST_SUPPORTED
1200PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr,
1201 png_const_uint_16p hist, int num_hist),PNG_EMPTY);
1202#endif
1203
1204/* Chunks that have keywords */
1205#ifdef PNG_WRITE_tEXt_SUPPORTED
1206PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr,
1207 png_const_charp key, png_const_charp text, size_t text_len),PNG_EMPTY);
1208#endif
1209
1210#ifdef PNG_WRITE_zTXt_SUPPORTED
1211PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp
1212 key, png_const_charp text, int compression),PNG_EMPTY);
1213#endif
1214
1215#ifdef PNG_WRITE_iTXt_SUPPORTED
1216PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr,
1217 int compression, png_const_charp key, png_const_charp lang,
1218 png_const_charp lang_key, png_const_charp text),PNG_EMPTY);
1219#endif
1220
1221#ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */
1222PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr,
1223 png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY);
1224#endif
1225
1226#ifdef PNG_WRITE_oFFs_SUPPORTED
1227PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr,
1228 png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY);
1229#endif
1230
1231#ifdef PNG_WRITE_pCAL_SUPPORTED
1232PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr,
1233 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
1234 png_const_charp units, png_charpp params),PNG_EMPTY);
1235#endif
1236
1237#ifdef PNG_WRITE_pHYs_SUPPORTED
1238PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr,
1239 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
1240 int unit_type),PNG_EMPTY);
1241#endif
1242
1243#ifdef PNG_WRITE_tIME_SUPPORTED
1244PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr,
1245 png_const_timep mod_time),PNG_EMPTY);
1246#endif
1247
1248#ifdef PNG_WRITE_sCAL_SUPPORTED
1249PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr,
1250 int unit, png_const_charp width, png_const_charp height),PNG_EMPTY);
1251#endif
1252
1253/* Called when finished processing a row of data */
1254PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr),
1255 PNG_EMPTY);
1256
1257/* Internal use only. Called before first row of data */
1258PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr),
1259 PNG_EMPTY);
1260
1261/* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an
1262 * array of png_ptr->width pixels. If the image is not interlaced or this
1263 * is the final pass this just does a memcpy, otherwise the "display" flag
1264 * is used to determine whether to copy pixels that are not in the current pass.
1265 *
1266 * Because 'png_do_read_interlace' (below) replicates pixels this allows this
1267 * function to achieve the documented 'blocky' appearance during interlaced read
1268 * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row'
1269 * are not changed if they are not in the current pass, when display is 0.
1270 *
1271 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless.
1272 *
1273 * The API always reads from the png_struct row buffer and always assumes that
1274 * it is full width (png_do_read_interlace has already been called.)
1275 *
1276 * This function is only ever used to write to row buffers provided by the
1277 * caller of the relevant libpng API and the row must have already been
1278 * transformed by the read transformations.
1279 *
1280 * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed
1281 * bitmasks for use within the code, otherwise runtime generated masks are used.
1282 * The default is compile time masks.
1283 */
1284#ifndef PNG_USE_COMPILE_TIME_MASKS
1285# define PNG_USE_COMPILE_TIME_MASKS 1
1286#endif
1287PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr,
1288 png_bytep row, int display),PNG_EMPTY);
1289
1290#ifdef PNG_READ_INTERLACING_SUPPORTED
1291/* Expand an interlaced row: the 'row_info' describes the pass data that has
1292 * been read in and must correspond to the pixels in 'row', the pixels are
1293 * expanded (moved apart) in 'row' to match the final layout, when doing this
1294 * the pixels are *replicated* to the intervening space. This is essential for
1295 * the correct operation of png_combine_row, above.
1296 */
1297PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info,
1298 png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY);
1299#endif
1300
1301/* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
1302
1303#ifdef PNG_WRITE_INTERLACING_SUPPORTED
1304/* Grab pixels out of a row for an interlaced pass */
1305PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info,
1306 png_bytep row, int pass),PNG_EMPTY);
1307#endif
1308
1309/* Unfilter a row: check the filter value before calling this, there is no point
1310 * calling it for PNG_FILTER_VALUE_NONE.
1311 */
1312PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop
1313 row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY);
1314
1315#if PNG_ARM_NEON_OPT > 0
1316PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info,
1317 png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1318PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop
1319 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1320PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop
1321 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1322PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop
1323 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1324PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop
1325 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1326PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop
1327 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1328PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop
1329 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1330#endif
1331
1332#if PNG_MIPS_MSA_OPT > 0
1333PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_msa,(png_row_infop row_info,
1334 png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1335PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_msa,(png_row_infop
1336 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1337PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_msa,(png_row_infop
1338 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1339PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_msa,(png_row_infop
1340 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1341PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_msa,(png_row_infop
1342 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1343PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_msa,(png_row_infop
1344 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1345PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_msa,(png_row_infop
1346 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1347#endif
1348
1349#if PNG_POWERPC_VSX_OPT > 0
1350PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_vsx,(png_row_infop row_info,
1351 png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1352PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_vsx,(png_row_infop
1353 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1354PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_vsx,(png_row_infop
1355 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1356PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_vsx,(png_row_infop
1357 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1358PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_vsx,(png_row_infop
1359 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1360PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_vsx,(png_row_infop
1361 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1362PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_vsx,(png_row_infop
1363 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1364#endif
1365
1366#if PNG_INTEL_SSE_IMPLEMENTATION > 0
1367PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_sse2,(png_row_infop
1368 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1369PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_sse2,(png_row_infop
1370 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1371PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_sse2,(png_row_infop
1372 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1373PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_sse2,(png_row_infop
1374 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1375PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_sse2,(png_row_infop
1376 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1377PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_sse2,(png_row_infop
1378 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1379#endif
1380
1381/* Choose the best filter to use and filter the row data */
1382PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr,
1383 png_row_infop row_info),PNG_EMPTY);
1384
1385#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1386PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr,
1387 png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY);
1388 /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer
1389 * is NULL the function checks, instead, for the end of the stream. In this
1390 * case a benign error will be issued if the stream end is not found or if
1391 * extra data has to be consumed.
1392 */
1393PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr),
1394 PNG_EMPTY);
1395 /* This cleans up when the IDAT LZ stream does not end when the last image
1396 * byte is read; there is still some pending input.
1397 */
1398
1399PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr),
1400 PNG_EMPTY);
1401 /* Finish a row while reading, dealing with interlacing passes, etc. */
1402#endif /* SEQUENTIAL_READ */
1403
1404/* Initialize the row buffers, etc. */
1405PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY);
1406
1407#if ZLIB_VERNUM >= 0x1240
1408PNG_INTERNAL_FUNCTION(int,png_zlib_inflate,(png_structrp png_ptr, int flush),
1409 PNG_EMPTY);
1410# define PNG_INFLATE(pp, flush) png_zlib_inflate(pp, flush)
1411#else /* Zlib < 1.2.4 */
1412# define PNG_INFLATE(pp, flush) inflate(&(pp)->zstream, flush)
1413#endif /* Zlib < 1.2.4 */
1414
1415#ifdef PNG_READ_TRANSFORMS_SUPPORTED
1416/* Optional call to update the users info structure */
1417PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr,
1418 png_inforp info_ptr),PNG_EMPTY);
1419#endif
1420
1421/* Shared transform functions, defined in pngtran.c */
1422#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
1423 defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
1424PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info,
1425 png_bytep row, int at_start),PNG_EMPTY);
1426#endif
1427
1428#ifdef PNG_16BIT_SUPPORTED
1429#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
1430PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info,
1431 png_bytep row),PNG_EMPTY);
1432#endif
1433#endif
1434
1435#if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
1436 defined(PNG_WRITE_PACKSWAP_SUPPORTED)
1437PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info,
1438 png_bytep row),PNG_EMPTY);
1439#endif
1440
1441#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
1442PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info,
1443 png_bytep row),PNG_EMPTY);
1444#endif
1445
1446#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
1447PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info,
1448 png_bytep row),PNG_EMPTY);
1449#endif
1450
1451/* The following decodes the appropriate chunks, and does error correction,
1452 * then calls the appropriate callback for the chunk if it is valid.
1453 */
1454
1455/* Decode the IHDR chunk */
1456PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr,
1457 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1458PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr,
1459 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1460PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr,
1461 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1462
1463#ifdef PNG_READ_bKGD_SUPPORTED
1464PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr,
1465 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1466#endif
1467
1468#ifdef PNG_READ_cHRM_SUPPORTED
1469PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr,
1470 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1471#endif
1472
1473#ifdef PNG_READ_eXIf_SUPPORTED
1474PNG_INTERNAL_FUNCTION(void,png_handle_eXIf,(png_structrp png_ptr,
1475 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1476#endif
1477
1478#ifdef PNG_READ_gAMA_SUPPORTED
1479PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr,
1480 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1481#endif
1482
1483#ifdef PNG_READ_hIST_SUPPORTED
1484PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr,
1485 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1486#endif
1487
1488#ifdef PNG_READ_iCCP_SUPPORTED
1489PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr,
1490 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1491#endif /* READ_iCCP */
1492
1493#ifdef PNG_READ_iTXt_SUPPORTED
1494PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr,
1495 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1496#endif
1497
1498#ifdef PNG_READ_oFFs_SUPPORTED
1499PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr,
1500 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1501#endif
1502
1503#ifdef PNG_READ_pCAL_SUPPORTED
1504PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr,
1505 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1506#endif
1507
1508#ifdef PNG_READ_pHYs_SUPPORTED
1509PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr,
1510 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1511#endif
1512
1513#ifdef PNG_READ_sBIT_SUPPORTED
1514PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr,
1515 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1516#endif
1517
1518#ifdef PNG_READ_sCAL_SUPPORTED
1519PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr,
1520 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1521#endif
1522
1523#ifdef PNG_READ_sPLT_SUPPORTED
1524PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr,
1525 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1526#endif /* READ_sPLT */
1527
1528#ifdef PNG_READ_sRGB_SUPPORTED
1529PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr,
1530 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1531#endif
1532
1533#ifdef PNG_READ_tEXt_SUPPORTED
1534PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr,
1535 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1536#endif
1537
1538#ifdef PNG_READ_tIME_SUPPORTED
1539PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr,
1540 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1541#endif
1542
1543#ifdef PNG_READ_tRNS_SUPPORTED
1544PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr,
1545 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1546#endif
1547
1548#ifdef PNG_READ_zTXt_SUPPORTED
1549PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr,
1550 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1551#endif
1552
1553PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_const_structrp png_ptr,
1554 png_uint_32 chunk_name),PNG_EMPTY);
1555
1556PNG_INTERNAL_FUNCTION(void,png_check_chunk_length,(png_const_structrp png_ptr,
1557 png_uint_32 chunk_length),PNG_EMPTY);
1558
1559PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr,
1560 png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY);
1561 /* This is the function that gets called for unknown chunks. The 'keep'
1562 * argument is either non-zero for a known chunk that has been set to be
1563 * handled as unknown or zero for an unknown chunk. By default the function
1564 * just skips the chunk or errors out if it is critical.
1565 */
1566
1567#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\
1568 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
1569PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling,
1570 (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY);
1571 /* Exactly as the API png_handle_as_unknown() except that the argument is a
1572 * 32-bit chunk name, not a string.
1573 */
1574#endif /* READ_UNKNOWN_CHUNKS || HANDLE_AS_UNKNOWN */
1575
1576/* Handle the transformations for reading and writing */
1577#ifdef PNG_READ_TRANSFORMS_SUPPORTED
1578PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr,
1579 png_row_infop row_info),PNG_EMPTY);
1580#endif
1581#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
1582PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr,
1583 png_row_infop row_info),PNG_EMPTY);
1584#endif
1585
1586#ifdef PNG_READ_TRANSFORMS_SUPPORTED
1587PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr),
1588 PNG_EMPTY);
1589#endif
1590
1591#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1592PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr,
1593 png_inforp info_ptr),PNG_EMPTY);
1594PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr,
1595 png_inforp info_ptr),PNG_EMPTY);
1596PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY);
1597PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr),
1598 PNG_EMPTY);
1599PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr,
1600 png_bytep buffer, size_t buffer_length),PNG_EMPTY);
1601PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY);
1602PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr,
1603 png_bytep buffer, size_t buffer_length),PNG_EMPTY);
1604PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr),
1605 PNG_EMPTY);
1606PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr,
1607 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1608PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr,
1609 png_inforp info_ptr),PNG_EMPTY);
1610PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr,
1611 png_inforp info_ptr),PNG_EMPTY);
1612PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr,
1613 png_bytep row),PNG_EMPTY);
1614PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr,
1615 png_inforp info_ptr),PNG_EMPTY);
1616PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr,
1617 png_inforp info_ptr),PNG_EMPTY);
1618PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr),
1619 PNG_EMPTY);
1620# ifdef PNG_READ_tEXt_SUPPORTED
1621PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr,
1622 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1623PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr,
1624 png_inforp info_ptr),PNG_EMPTY);
1625# endif
1626# ifdef PNG_READ_zTXt_SUPPORTED
1627PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr,
1628 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1629PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr,
1630 png_inforp info_ptr),PNG_EMPTY);
1631# endif
1632# ifdef PNG_READ_iTXt_SUPPORTED
1633PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr,
1634 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1635PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr,
1636 png_inforp info_ptr),PNG_EMPTY);
1637# endif
1638
1639#endif /* PROGRESSIVE_READ */
1640
1641/* Added at libpng version 1.6.0 */
1642#ifdef PNG_GAMMA_SUPPORTED
1643PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr,
1644 png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY);
1645 /* Set the colorspace gamma with a value provided by the application or by
1646 * the gAMA chunk on read. The value will override anything set by an ICC
1647 * profile.
1648 */
1649
1650PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr,
1651 png_inforp info_ptr), PNG_EMPTY);
1652 /* Synchronize the info 'valid' flags with the colorspace */
1653
1654PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr,
1655 png_inforp info_ptr), PNG_EMPTY);
1656 /* Copy the png_struct colorspace to the info_struct and call the above to
1657 * synchronize the flags. Checks for NULL info_ptr and does nothing.
1658 */
1659#endif
1660
1661/* Added at libpng version 1.4.0 */
1662#ifdef PNG_COLORSPACE_SUPPORTED
1663/* These internal functions are for maintaining the colorspace structure within
1664 * a png_info or png_struct (or, indeed, both).
1665 */
1666PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities,
1667 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy,
1668 int preferred), PNG_EMPTY);
1669
1670PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints,
1671 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ,
1672 int preferred), PNG_EMPTY);
1673
1674#ifdef PNG_sRGB_SUPPORTED
1675PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr,
1676 png_colorspacerp colorspace, int intent), PNG_EMPTY);
1677 /* This does set the colorspace gAMA and cHRM values too, but doesn't set the
1678 * flags to write them, if it returns false there was a problem and an error
1679 * message has already been output (but the colorspace may still need to be
1680 * synced to record the invalid flag).
1681 */
1682#endif /* sRGB */
1683
1684#ifdef PNG_iCCP_SUPPORTED
1685PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr,
1686 png_colorspacerp colorspace, png_const_charp name,
1687 png_uint_32 profile_length, png_const_bytep profile, int color_type),
1688 PNG_EMPTY);
1689 /* The 'name' is used for information only */
1690
1691/* Routines for checking parts of an ICC profile. */
1692#ifdef PNG_READ_iCCP_SUPPORTED
1693PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr,
1694 png_colorspacerp colorspace, png_const_charp name,
1695 png_uint_32 profile_length), PNG_EMPTY);
1696#endif /* READ_iCCP */
1697PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr,
1698 png_colorspacerp colorspace, png_const_charp name,
1699 png_uint_32 profile_length,
1700 png_const_bytep profile /* first 132 bytes only */, int color_type),
1701 PNG_EMPTY);
1702PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr,
1703 png_colorspacerp colorspace, png_const_charp name,
1704 png_uint_32 profile_length,
1705 png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY);
1706#ifdef PNG_sRGB_SUPPORTED
1707PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,(
1708 png_const_structrp png_ptr, png_colorspacerp colorspace,
1709 png_const_bytep profile, uLong adler), PNG_EMPTY);
1710 /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may
1711 * be zero to indicate that it is not available. It is used, if provided,
1712 * as a fast check on the profile when checking to see if it is sRGB.
1713 */
1714#endif
1715#endif /* iCCP */
1716
1717#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
1718PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients,
1719 (png_structrp png_ptr), PNG_EMPTY);
1720 /* Set the rgb_to_gray coefficients from the colorspace Y values */
1721#endif /* READ_RGB_TO_GRAY */
1722#endif /* COLORSPACE */
1723
1724/* Added at libpng version 1.4.0 */
1725PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr,
1726 png_uint_32 width, png_uint_32 height, int bit_depth,
1727 int color_type, int interlace_type, int compression_type,
1728 int filter_type),PNG_EMPTY);
1729
1730/* Added at libpng version 1.5.10 */
1731#if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \
1732 defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED)
1733PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes,
1734 (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY);
1735#endif
1736
1737#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
1738PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr,
1739 png_const_charp name),PNG_NORETURN);
1740#endif
1741
1742/* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite
1743 * the end. Always leaves the buffer nul terminated. Never errors out (and
1744 * there is no error code.)
1745 */
1746PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize,
1747 size_t pos, png_const_charp string),PNG_EMPTY);
1748
1749/* Various internal functions to handle formatted warning messages, currently
1750 * only implemented for warnings.
1751 */
1752#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)
1753/* Utility to dump an unsigned value into a buffer, given a start pointer and
1754 * and end pointer (which should point just *beyond* the end of the buffer!)
1755 * Returns the pointer to the start of the formatted string. This utility only
1756 * does unsigned values.
1757 */
1758PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start,
1759 png_charp end, int format, png_alloc_size_t number),PNG_EMPTY);
1760
1761/* Convenience macro that takes an array: */
1762#define PNG_FORMAT_NUMBER(buffer,format,number) \
1763 png_format_number(buffer, buffer + (sizeof buffer), format, number)
1764
1765/* Suggested size for a number buffer (enough for 64 bits and a sign!) */
1766#define PNG_NUMBER_BUFFER_SIZE 24
1767
1768/* These are the integer formats currently supported, the name is formed from
1769 * the standard printf(3) format string.
1770 */
1771#define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */
1772#define PNG_NUMBER_FORMAT_02u 2
1773#define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */
1774#define PNG_NUMBER_FORMAT_02d 2
1775#define PNG_NUMBER_FORMAT_x 3
1776#define PNG_NUMBER_FORMAT_02x 4
1777#define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */
1778#endif
1779
1780#ifdef PNG_WARNINGS_SUPPORTED
1781/* New defines and members adding in libpng-1.5.4 */
1782# define PNG_WARNING_PARAMETER_SIZE 32
1783# define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */
1784
1785/* An l-value of this type has to be passed to the APIs below to cache the
1786 * values of the parameters to a formatted warning message.
1787 */
1788typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][
1789 PNG_WARNING_PARAMETER_SIZE];
1790
1791PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p,
1792 int number, png_const_charp string),PNG_EMPTY);
1793 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters,
1794 * including the trailing '\0'.
1795 */
1796PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned,
1797 (png_warning_parameters p, int number, int format, png_alloc_size_t value),
1798 PNG_EMPTY);
1799 /* Use png_alloc_size_t because it is an unsigned type as big as any we
1800 * need to output. Use the following for a signed value.
1801 */
1802PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed,
1803 (png_warning_parameters p, int number, int format, png_int_32 value),
1804 PNG_EMPTY);
1805
1806PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr,
1807 png_warning_parameters p, png_const_charp message),PNG_EMPTY);
1808 /* 'message' follows the X/Open approach of using @1, @2 to insert
1809 * parameters previously supplied using the above functions. Errors in
1810 * specifying the parameters will simply result in garbage substitutions.
1811 */
1812#endif
1813
1814#ifdef PNG_BENIGN_ERRORS_SUPPORTED
1815/* Application errors (new in 1.6); use these functions (declared below) for
1816 * errors in the parameters or order of API function calls on read. The
1817 * 'warning' should be used for an error that can be handled completely; the
1818 * 'error' for one which can be handled safely but which may lose application
1819 * information or settings.
1820 *
1821 * By default these both result in a png_error call prior to release, while in a
1822 * released version the 'warning' is just a warning. However if the application
1823 * explicitly disables benign errors (explicitly permitting the code to lose
1824 * information) they both turn into warnings.
1825 *
1826 * If benign errors aren't supported they end up as the corresponding base call
1827 * (png_warning or png_error.)
1828 */
1829PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr,
1830 png_const_charp message),PNG_EMPTY);
1831 /* The application provided invalid parameters to an API function or called
1832 * an API function at the wrong time, libpng can completely recover.
1833 */
1834
1835PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr,
1836 png_const_charp message),PNG_EMPTY);
1837 /* As above but libpng will ignore the call, or attempt some other partial
1838 * recovery from the error.
1839 */
1840#else
1841# define png_app_warning(pp,s) png_warning(pp,s)
1842# define png_app_error(pp,s) png_error(pp,s)
1843#endif
1844
1845PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr,
1846 png_const_charp message, int error),PNG_EMPTY);
1847 /* Report a recoverable issue in chunk data. On read this is used to report
1848 * a problem found while reading a particular chunk and the
1849 * png_chunk_benign_error or png_chunk_warning function is used as
1850 * appropriate. On write this is used to report an error that comes from
1851 * data set via an application call to a png_set_ API and png_app_error or
1852 * png_app_warning is used as appropriate.
1853 *
1854 * The 'error' parameter must have one of the following values:
1855 */
1856#define PNG_CHUNK_WARNING 0 /* never an error */
1857#define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */
1858#define PNG_CHUNK_ERROR 2 /* always an error */
1859
1860/* ASCII to FP interfaces, currently only implemented if sCAL
1861 * support is required.
1862 */
1863#if defined(PNG_sCAL_SUPPORTED)
1864/* MAX_DIGITS is actually the maximum number of characters in an sCAL
1865 * width or height, derived from the precision (number of significant
1866 * digits - a build time settable option) and assumptions about the
1867 * maximum ridiculous exponent.
1868 */
1869#define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/)
1870
1871#ifdef PNG_FLOATING_POINT_SUPPORTED
1872PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr,
1873 png_charp ascii, size_t size, double fp, unsigned int precision),
1874 PNG_EMPTY);
1875#endif /* FLOATING_POINT */
1876
1877#ifdef PNG_FIXED_POINT_SUPPORTED
1878PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr,
1879 png_charp ascii, size_t size, png_fixed_point fp),PNG_EMPTY);
1880#endif /* FIXED_POINT */
1881#endif /* sCAL */
1882
1883#if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED)
1884/* An internal API to validate the format of a floating point number.
1885 * The result is the index of the next character. If the number is
1886 * not valid it will be the index of a character in the supposed number.
1887 *
1888 * The format of a number is defined in the PNG extensions specification
1889 * and this API is strictly conformant to that spec, not anyone elses!
1890 *
1891 * The format as a regular expression is:
1892 *
1893 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)?
1894 *
1895 * or:
1896 *
1897 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)?
1898 *
1899 * The complexity is that either integer or fraction must be present and the
1900 * fraction is permitted to have no digits only if the integer is present.
1901 *
1902 * NOTE: The dangling E problem.
1903 * There is a PNG valid floating point number in the following:
1904 *
1905 * PNG floating point numbers are not greedy.
1906 *
1907 * Working this out requires *TWO* character lookahead (because of the
1908 * sign), the parser does not do this - it will fail at the 'r' - this
1909 * doesn't matter for PNG sCAL chunk values, but it requires more care
1910 * if the value were ever to be embedded in something more complex. Use
1911 * ANSI-C strtod if you need the lookahead.
1912 */
1913/* State table for the parser. */
1914#define PNG_FP_INTEGER 0 /* before or in integer */
1915#define PNG_FP_FRACTION 1 /* before or in fraction */
1916#define PNG_FP_EXPONENT 2 /* before or in exponent */
1917#define PNG_FP_STATE 3 /* mask for the above */
1918#define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */
1919#define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */
1920#define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */
1921#define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */
1922#define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */
1923
1924/* These three values don't affect the parser. They are set but not used.
1925 */
1926#define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */
1927#define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */
1928#define PNG_FP_NONZERO 256 /* A non-zero value */
1929#define PNG_FP_STICKY 448 /* The above three flags */
1930
1931/* This is available for the caller to store in 'state' if required. Do not
1932 * call the parser after setting it (the parser sometimes clears it.)
1933 */
1934#define PNG_FP_INVALID 512 /* Available for callers as a distinct value */
1935
1936/* Result codes for the parser (boolean - true meants ok, false means
1937 * not ok yet.)
1938 */
1939#define PNG_FP_MAYBE 0 /* The number may be valid in the future */
1940#define PNG_FP_OK 1 /* The number is valid */
1941
1942/* Tests on the sticky non-zero and negative flags. To pass these checks
1943 * the state must also indicate that the whole number is valid - this is
1944 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this
1945 * is equivalent to PNG_FP_OK above.)
1946 */
1947#define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO)
1948 /* NZ_MASK: the string is valid and a non-zero negative value */
1949#define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO)
1950 /* Z MASK: the string is valid and a non-zero value. */
1951 /* PNG_FP_SAW_DIGIT: the string is valid. */
1952#define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT)
1953#define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK)
1954#define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK)
1955
1956/* The actual parser. This can be called repeatedly. It updates
1957 * the index into the string and the state variable (which must
1958 * be initialized to 0). It returns a result code, as above. There
1959 * is no point calling the parser any more if it fails to advance to
1960 * the end of the string - it is stuck on an invalid character (or
1961 * terminated by '\0').
1962 *
1963 * Note that the pointer will consume an E or even an E+ and then leave
1964 * a 'maybe' state even though a preceding integer.fraction is valid.
1965 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was
1966 * a valid number. It's possible to recover from this by calling
1967 * the parser again (from the start, with state 0) but with a string
1968 * that omits the last character (i.e. set the size to the index of
1969 * the problem character.) This has not been tested within libpng.
1970 */
1971PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string,
1972 size_t size, int *statep, png_size_tp whereami),PNG_EMPTY);
1973
1974/* This is the same but it checks a complete string and returns true
1975 * only if it just contains a floating point number. As of 1.5.4 this
1976 * function also returns the state at the end of parsing the number if
1977 * it was valid (otherwise it returns 0.) This can be used for testing
1978 * for negative or zero values using the sticky flag.
1979 */
1980PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string,
1981 size_t size),PNG_EMPTY);
1982#endif /* pCAL || sCAL */
1983
1984#if defined(PNG_GAMMA_SUPPORTED) ||\
1985 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED)
1986/* Added at libpng version 1.5.0 */
1987/* This is a utility to provide a*times/div (rounded) and indicate
1988 * if there is an overflow. The result is a boolean - false (0)
1989 * for overflow, true (1) if no overflow, in which case *res
1990 * holds the result.
1991 */
1992PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a,
1993 png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY);
1994#endif
1995
1996#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED)
1997/* Same deal, but issue a warning on overflow and return 0. */
1998PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn,
1999 (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by,
2000 png_int_32 divided_by),PNG_EMPTY);
2001#endif
2002
2003#ifdef PNG_GAMMA_SUPPORTED
2004/* Calculate a reciprocal - used for gamma values. This returns
2005 * 0 if the argument is 0 in order to maintain an undefined value;
2006 * there are no warnings.
2007 */
2008PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a),
2009 PNG_EMPTY);
2010
2011#ifdef PNG_READ_GAMMA_SUPPORTED
2012/* The same but gives a reciprocal of the product of two fixed point
2013 * values. Accuracy is suitable for gamma calculations but this is
2014 * not exact - use png_muldiv for that. Only required at present on read.
2015 */
2016PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a,
2017 png_fixed_point b),PNG_EMPTY);
2018#endif
2019
2020/* Return true if the gamma value is significantly different from 1.0 */
2021PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value),
2022 PNG_EMPTY);
2023#endif
2024
2025#ifdef PNG_READ_GAMMA_SUPPORTED
2026/* Internal fixed point gamma correction. These APIs are called as
2027 * required to convert single values - they don't need to be fast,
2028 * they are not used when processing image pixel values.
2029 *
2030 * While the input is an 'unsigned' value it must actually be the
2031 * correct bit value - 0..255 or 0..65535 as required.
2032 */
2033PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr,
2034 unsigned int value, png_fixed_point gamma_value),PNG_EMPTY);
2035PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value,
2036 png_fixed_point gamma_value),PNG_EMPTY);
2037PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value,
2038 png_fixed_point gamma_value),PNG_EMPTY);
2039PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr),
2040 PNG_EMPTY);
2041PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr,
2042 int bit_depth),PNG_EMPTY);
2043#endif
2044
2045/* SIMPLIFIED READ/WRITE SUPPORT */
2046#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
2047 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
2048/* The internal structure that png_image::opaque points to. */
2049typedef struct png_control
2050{
2051 png_structp png_ptr;
2052 png_infop info_ptr;
2053 png_voidp error_buf; /* Always a jmp_buf at present. */
2054
2055 png_const_bytep memory; /* Memory buffer. */
2056 size_t size; /* Size of the memory buffer. */
2057
2058 unsigned int for_write :1; /* Otherwise it is a read structure */
2059 unsigned int owned_file :1; /* We own the file in io_ptr */
2060} png_control;
2061
2062/* Return the pointer to the jmp_buf from a png_control: necessary because C
2063 * does not reveal the type of the elements of jmp_buf.
2064 */
2065#ifdef __cplusplus
2066# define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0])
2067#else
2068# define png_control_jmp_buf(pc) ((pc)->error_buf)
2069#endif
2070
2071/* Utility to safely execute a piece of libpng code catching and logging any
2072 * errors that might occur. Returns true on success, false on failure (either
2073 * of the function or as a result of a png_error.)
2074 */
2075PNG_INTERNAL_CALLBACK(void,png_safe_error,(png_structp png_ptr,
2076 png_const_charp error_message),PNG_NORETURN);
2077
2078#ifdef PNG_WARNINGS_SUPPORTED
2079PNG_INTERNAL_CALLBACK(void,png_safe_warning,(png_structp png_ptr,
2080 png_const_charp warning_message),PNG_EMPTY);
2081#else
2082# define png_safe_warning 0/*dummy argument*/
2083#endif
2084
2085PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image,
2086 int (*function)(png_voidp), png_voidp arg),PNG_EMPTY);
2087
2088/* Utility to log an error; this also cleans up the png_image; the function
2089 * always returns 0 (false).
2090 */
2091PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image,
2092 png_const_charp error_message),PNG_EMPTY);
2093
2094#ifndef PNG_SIMPLIFIED_READ_SUPPORTED
2095/* png_image_free is used by the write code but not exported */
2096PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY);
2097#endif /* !SIMPLIFIED_READ */
2098
2099#endif /* SIMPLIFIED READ/WRITE */
2100
2101/* These are initialization functions for hardware specific PNG filter
2102 * optimizations; list these here then select the appropriate one at compile
2103 * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined
2104 * the generic code is used.
2105 */
2106#ifdef PNG_FILTER_OPTIMIZATIONS
2107PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr,
2108 unsigned int bpp), PNG_EMPTY);
2109 /* Just declare the optimization that will be used */
2110#else
2111 /* List *all* the possible optimizations here - this branch is required if
2112 * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in
2113 * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing.
2114 */
2115# if PNG_ARM_NEON_OPT > 0
2116PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon,
2117 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
2118#endif
2119
2120#if PNG_MIPS_MSA_OPT > 0
2121PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_msa,
2122 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
2123#endif
2124
2125# if PNG_INTEL_SSE_IMPLEMENTATION > 0
2126PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_sse2,
2127 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
2128# endif
2129#endif
2130
2131PNG_INTERNAL_FUNCTION(png_uint_32, png_check_keyword, (png_structrp png_ptr,
2132 png_const_charp key, png_bytep new_key), PNG_EMPTY);
2133
2134#if PNG_ARM_NEON_IMPLEMENTATION == 1
2135PNG_INTERNAL_FUNCTION(void,
2136 png_riffle_palette_neon,
2137 (png_structrp),
2138 PNG_EMPTY);
2139PNG_INTERNAL_FUNCTION(int,
2140 png_do_expand_palette_rgba8_neon,
2141 (png_structrp,
2142 png_row_infop,
2143 png_const_bytep,
2144 const png_bytepp,
2145 const png_bytepp),
2146 PNG_EMPTY);
2147PNG_INTERNAL_FUNCTION(int,
2148 png_do_expand_palette_rgb8_neon,
2149 (png_structrp,
2150 png_row_infop,
2151 png_const_bytep,
2152 const png_bytepp,
2153 const png_bytepp),
2154 PNG_EMPTY);
2155#endif
2156
2157/* Maintainer: Put new private prototypes here ^ */
2158
2159#include "pngdebug.h"
2160
2161#ifdef __cplusplus
2162}
2163#endif
2164
2165#endif /* PNG_VERSION_INFO_ONLY */
2166#endif /* PNGPRIV_H */
2167

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