blob: 313f0fe461b9935fa7d696793aa52066159cf3eb [file] [log] [blame]
Glenn Randers-Pehrsond60b8fa2006-04-20 21:31:14 -05001
Glenn Randers-Pehrsonbeb572e2006-08-19 13:59:24 -05002/* pngpriv.h - private declarations for use inside libpng
Glenn Randers-Pehrsond60b8fa2006-04-20 21:31:14 -05003 *
Glenn Randers-Pehrsond60b8fa2006-04-20 21:31:14 -05004 * For conditions of distribution and use, see copyright notice in png.h
Glenn Randers-Pehrson1531bd62012-01-01 14:45:04 -06005 * Copyright (c) 1998-2012 Glenn Randers-Pehrson
Glenn Randers-Pehrsond60b8fa2006-04-20 21:31:14 -05006 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
7 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
Glenn Randers-Pehrson3e61d792009-06-24 09:31:28 -05008 *
Glenn Randers-Pehrson13831bc2011-12-21 08:28:28 -06009 * Last changed in libpng 1.6.0 [(PENDING RELEASE)]
Glenn Randers-Pehrsonf5ea1b72011-01-06 06:42:51 -060010 *
Glenn Randers-Pehrsonbfbf8652009-06-26 21:46:52 -050011 * This code is released under the libpng license.
Glenn Randers-Pehrsonc332bbc2009-06-25 13:43:50 -050012 * For conditions of distribution and use, see the disclaimer
Glenn Randers-Pehrson037023b2009-06-24 10:27:36 -050013 * and license in png.h
Glenn Randers-Pehrsond60b8fa2006-04-20 21:31:14 -050014 */
15
Glenn Randers-Pehrsonbeb572e2006-08-19 13:59:24 -050016/* The symbols declared in this file (including the functions declared
John Bowler572b0782012-01-31 07:09:34 -060017 * as extern) are PRIVATE. They are not part of the libpng public
Glenn Randers-Pehrsonbeb572e2006-08-19 13:59:24 -050018 * interface, and are not recommended for use by regular applications.
19 * Some of them may become public in the future; others may stay private,
20 * change in an incompatible way, or even disappear.
21 * Although the libpng users are not forbidden to include this header,
22 * they should be well aware of the issues that may arise from doing so.
23 */
24
25#ifndef PNGPRIV_H
26#define PNGPRIV_H
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -050027
Glenn Randers-Pehrsonb3b71682011-05-03 22:30:19 -050028/* Feature Test Macros. The following are defined here to ensure that correctly
29 * implemented libraries reveal the APIs libpng needs to build and hide those
30 * that are not needed and potentially damaging to the compilation.
31 *
32 * Feature Test Macros must be defined before any system header is included (see
33 * POSIX 1003.1 2.8.2 "POSIX Symbols."
34 *
35 * These macros only have an effect if the operating system supports either
36 * POSIX 1003.1 or C99, or both. On other operating systems (particularly
37 * Windows/Visual Studio) there is no effect; the OS specific tests below are
38 * still required (as of 2011-05-02.)
39 */
40#define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */
Glenn Randers-Pehrsonb3b71682011-05-03 22:30:19 -050041
John Bowlerbaeb6d12011-11-26 18:21:02 -060042/* Standard library headers not required by png.h: */
Glenn Randers-Pehrsone600c512010-08-18 07:25:46 -050043#include <stdlib.h>
John Bowlerbaeb6d12011-11-26 18:21:02 -060044#include <string.h>
Glenn Randers-Pehrson65c03392011-10-06 21:54:17 -050045
John Bowler7b979652011-08-16 22:36:43 -050046#define PNGLIB_BUILD /*libpng is being built, not used*/
47
John Bowler5d567862011-12-24 09:12:00 -060048/* If HAVE_CONFIG_H is defined during the build then the build system must
49 * provide an appropriate "config.h" file on the include path. The header file
50 * must provide definitions as required below (search for "HAVE_CONFIG_H");
51 * see configure.ac for more details of the requirements. The macro
52 * "PNG_NO_CONFIG_H" is provided for maintainers to test for dependencies on
53 * 'configure'; define this macro to prevent the configure build including the
54 * configure generated config.h. Libpng is expected to compile without *any*
55 * special build system support on a reasonably ANSI-C compliant system.
56 */
57#if (defined HAVE_CONFIG_H) && !(defined PNG_NO_CONFIG_H)
58# include <config.h>
59
60 /* Pick up the definition of 'restrict' from config.h if it was read: */
61# define PNG_RESTRICT restrict
62#endif
63
John Bowlerbce79882012-02-13 11:45:22 -060064/* To support symbol prefixing it is necessary to know *before* including png.h
65 * whether the fixed point (and maybe other) APIs are exported, because if they
66 * are not internal definitions may be required. This is handled below just
67 * before png.h is included, but load the configuration now if it is available.
68 */
69#ifndef PNGLCONF_H
70# include "pnglibconf.h"
71#endif
72
73/* Local renames may change non-exported API functions from png.h */
74#if defined PNG_PREFIX && !defined PNGPREFIX_H
75# include "pngprefix.h"
76#endif
77
Glenn Randers-Pehrsonaecef092010-04-17 18:03:02 -050078#ifdef PNG_USER_CONFIG
79# include "pngusr.h"
Glenn Randers-Pehrson4f108d82010-08-24 21:05:43 -050080 /* These should have been defined in pngusr.h */
81# ifndef PNG_USER_PRIVATEBUILD
82# define PNG_USER_PRIVATEBUILD "Custom libpng build"
83# endif
84# ifndef PNG_USER_DLLFNAME_POSTFIX
85# define PNG_USER_DLLFNAME_POSTFIX "Cb"
86# endif
Glenn Randers-Pehrsonaecef092010-04-17 18:03:02 -050087#endif
John Bowler7b979652011-08-16 22:36:43 -050088
89/* Is this a build of a DLL where compilation of the object modules requires
90 * different preprocessor settings to those required for a simple library? If
91 * so PNG_BUILD_DLL must be set.
92 *
93 * If libpng is used inside a DLL but that DLL does not export the libpng APIs
94 * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a
95 * static library of libpng then link the DLL against that.
96 */
97#ifndef PNG_BUILD_DLL
98# ifdef DLL_EXPORT
99 /* This is set by libtool when files are compiled for a DLL; libtool
100 * always compiles twice, even on systems where it isn't necessary. Set
101 * PNG_BUILD_DLL in case it is necessary:
102 */
103# define PNG_BUILD_DLL
104# else
105# ifdef _WINDLL
106 /* This is set by the Microsoft Visual Studio IDE in projects that
107 * build a DLL. It can't easily be removed from those projects (it
108 * isn't visible in the Visual Studio UI) so it is a fairly reliable
109 * indication that PNG_IMPEXP needs to be set to the DLL export
110 * attributes.
111 */
112# define PNG_BUILD_DLL
113# else
114# ifdef __DLL__
115 /* This is set by the Borland C system when compiling for a DLL
116 * (as above.)
117 */
118# define PNG_BUILD_DLL
119# else
120 /* Add additional compiler cases here. */
121# endif
122# endif
123# endif
124#endif /* Setting PNG_BUILD_DLL if required */
125
126/* See pngconf.h for more details: the builder of the library may set this on
127 * the command line to the right thing for the specific compilation system or it
128 * may be automagically set above (at present we know of no system where it does
129 * need to be set on the command line.)
130 *
131 * PNG_IMPEXP must be set here when building the library to prevent pngconf.h
132 * setting it to the "import" setting for a DLL build.
133 */
134#ifndef PNG_IMPEXP
135# ifdef PNG_BUILD_DLL
136# define PNG_IMPEXP PNG_DLL_EXPORT
137# else
138 /* Not building a DLL, or the DLL doesn't require specific export
139 * definitions.
140 */
141# define PNG_IMPEXP
142# endif
143#endif
144
145/* No warnings for private or deprecated functions in the build: */
146#ifndef PNG_DEPRECATED
147# define PNG_DEPRECATED
148#endif
149#ifndef PNG_PRIVATE
150# define PNG_PRIVATE
151#endif
152
John Bowlerbce79882012-02-13 11:45:22 -0600153/* Symbol preprocessing support.
154 *
155 * To enable listing global, but internal, symbols the following macros should
156 * always be used to declare an extern data or function object in this file.
157 */
158#ifndef PNG_INTERNAL_DATA
159# define PNG_INTERNAL_DATA(type, name, array) extern type name array
160#endif
161
162#ifndef PNG_INTERNAL_FUNCTION
163# define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\
164 extern PNG_FUNCTION(type, name, args, PNG_EMPTY attributes)
165#endif
166
167/* If floating or fixed point APIs are disabled they may still be compiled
168 * internally. To handle this make sure they are declared as the appropriate
169 * internal extern function (otherwise the symbol prefixing stuff won't work and
170 * the functions will be used without definitions.)
171 *
172 * NOTE: although all the API functions are declared here they are not all
173 * actually built!
174 */
175#ifndef PNG_FP_EXPORT
176# ifndef PNG_FLOATING_POINT_SUPPORTED
177# define PNG_FP_EXPORT(ordinal, type, name, args)\
178 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
179# endif
180#endif
181#ifndef PNG_FIXED_EXPORT
182# ifndef PNG_FIXED_POINT_SUPPORTED
183# define PNG_FIXED_EXPORT(ordinal, type, name, args)\
184 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
185# endif
186#endif
187
Glenn Randers-Pehrsonc3cd22b2010-03-08 21:10:25 -0600188#include "png.h"
189#include "pnginfo.h"
190#include "pngstruct.h"
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500191
John Bowler7b979652011-08-16 22:36:43 -0500192/* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */
193#ifndef PNG_DLL_EXPORT
194# define PNG_DLL_EXPORT
195#endif
196
Glenn Randers-Pehrson4690b892012-02-24 11:43:31 -0600197/* SECURITY and SAFETY:
198 *
199 * By default libpng is built without any internal limits on image size,
200 * individual heap (png_malloc) allocations or the total amount of memory used.
201 * If PNG_SAFE_LIMITS_SUPPORTED is defined, however, the limits below are used
202 * (unless individually overridden). These limits are believed to be fairly
203 * safe, but builders of secure systems should verify the values against the
204 * real system capabilities.
205 */
206#ifdef PNG_SAFE_LIMITS_SUPPORTED
207 /* 'safe' limits */
208# ifndef PNG_USER_WIDTH_MAX
209# define PNG_USER_WIDTH_MAX 1000000
210# endif
211# ifndef PNG_USER_HEIGHT_MAX
212# define PNG_USER_HEIGHT_MAX 1000000
213# endif
214# ifndef PNG_USER_CHUNK_CACHE_MAX
215# define PNG_USER_CHUNK_CACHE_MAX 128
216# endif
217# ifndef PNG_USER_CHUNK_MALLOC_MAX
218# define PNG_USER_CHUNK_MALLOC_MAX 8000000
219# endif
220#else
221 /* values for no limits */
222# ifndef PNG_USER_WIDTH_MAX
223# define PNG_USER_WIDTH_MAX 0x7fffffff
224# endif
225# ifndef PNG_USER_HEIGHT_MAX
226# define PNG_USER_HEIGHT_MAX 0x7fffffff
227# endif
228# ifndef PNG_USER_CHUNK_CACHE_MAX
229# define PNG_USER_CHUNK_CACHE_MAX 0
230# endif
231# ifndef PNG_USER_CHUNK_MALLOC_MAX
232# define PNG_USER_CHUNK_MALLOC_MAX 0
233# endif
234#endif
235
Glenn Randers-Pehrson4c7e8202011-11-26 19:00:01 -0600236/* This is used for 16 bit gamma tables -- only the top level pointers are
237 * const; this could be changed:
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500238 */
John Bowlerbaeb6d12011-11-26 18:21:02 -0600239typedef const png_uint_16p * png_const_uint_16pp;
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500240
Glenn Randers-Pehrson862cb202010-04-16 22:12:51 -0500241/* Moved to pngpriv.h at libpng-1.5.0 */
Glenn Randers-Pehrson9f044c12010-12-07 14:59:43 -0600242/* NOTE: some of these may have been used in external applications as
243 * these definitions were exposed in pngconf.h prior to 1.5.
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500244 */
Glenn Randers-Pehrson9f044c12010-12-07 14:59:43 -0600245
Glenn Randers-Pehrson862cb202010-04-16 22:12:51 -0500246/* If you are running on a machine where you cannot allocate more
247 * than 64K of memory at once, uncomment this. While libpng will not
248 * normally need that much memory in a chunk (unless you load up a very
249 * large file), zlib needs to know how big of a chunk it can use, and
250 * libpng thus makes sure to check any memory allocation to verify it
251 * will fit into memory.
252 *
253 * zlib provides 'MAXSEG_64K' which, if defined, indicates the
254 * same limit and pngconf.h (already included) sets the limit
255 * if certain operating systems are detected.
256 */
257#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
258# define PNG_MAX_MALLOC_64K
259#endif
260
Glenn Randers-Pehrsonf3dd1cc2011-03-18 22:02:20 -0500261#ifndef PNG_UNUSED
Glenn Randers-Pehrson25d2d472011-01-31 10:25:10 -0600262/* Unused formal parameter warnings are silenced using the following macro
263 * which is expected to have no bad effects on performance (optimizing
264 * compilers will probably remove it entirely). Note that if you replace
265 * it with something other than whitespace, you must include the terminating
266 * semicolon.
Glenn Randers-Pehrsond546f432010-12-04 20:41:36 -0600267 */
Glenn Randers-Pehrsonf3dd1cc2011-03-18 22:02:20 -0500268# define PNG_UNUSED(param) (void)param;
269#endif
Glenn Randers-Pehrsonbf3293a2011-01-28 15:14:43 -0600270
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500271/* Just a little check that someone hasn't tried to define something
272 * contradictory.
Glenn Randers-Pehrson862cb202010-04-16 22:12:51 -0500273 */
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500274#if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K)
275# undef PNG_ZBUF_SIZE
276# define PNG_ZBUF_SIZE 65536L
Glenn Randers-Pehrson862cb202010-04-16 22:12:51 -0500277#endif
278
John Bowler8d261262011-06-18 13:37:11 -0500279/* PNG_STATIC is used to mark internal file scope functions if they need to be
280 * accessed for implementation tests (see the code in tests/?*).
281 */
282#ifndef PNG_STATIC
283# define PNG_STATIC static
284#endif
285
John Bowler88b77cc2011-05-05 06:49:55 -0500286/* If warnings or errors are turned off the code is disabled or redirected here.
Glenn Randers-Pehrsonef217b72011-06-15 12:58:27 -0500287 * From 1.5.4 functions have been added to allow very limited formatting of
John Bowler88b77cc2011-05-05 06:49:55 -0500288 * error and warning messages - this code will also be disabled here.
Glenn Randers-Pehrsonaecef092010-04-17 18:03:02 -0500289 */
John Bowler88b77cc2011-05-05 06:49:55 -0500290#ifdef PNG_WARNINGS_SUPPORTED
291# define PNG_WARNING_PARAMETERS(p) png_warning_parameters p;
292#else
293# define png_warning(s1,s2) ((void)(s1))
294# define png_chunk_warning(s1,s2) ((void)(s1))
295# define png_warning_parameter(p,number,string) ((void)0)
296# define png_warning_parameter_unsigned(p,number,format,value) ((void)0)
297# define png_warning_parameter_signed(p,number,format,value) ((void)0)
298# define png_formatted_warning(pp,p,message) ((void)(pp))
Glenn Randers-Pehrsonaf855e42011-05-07 10:52:49 -0500299# define PNG_WARNING_PARAMETERS(p)
Glenn Randers-Pehrsonaecef092010-04-17 18:03:02 -0500300#endif
301#ifndef PNG_ERROR_TEXT_SUPPORTED
302# define png_error(s1,s2) png_err(s1)
303# define png_chunk_error(s1,s2) png_err(s1)
Glenn Randers-Pehrson48dc6eb2010-07-31 07:09:58 -0500304# define png_fixed_error(s1,s2) png_err(s1)
Glenn Randers-Pehrson862cb202010-04-16 22:12:51 -0500305#endif
306
John Bowler4fa96a42011-11-16 16:39:16 -0600307/* C allows up-casts from (void*) to any pointer and (const void*) to any
308 * pointer to a const object. C++ regards this as a type error and requires an
309 * explicit, static, cast and provides the static_cast<> rune to ensure that
310 * const is not cast away.
311 */
312#ifdef __cplusplus
313# define png_voidcast(type, value) static_cast<type>(value)
John Bowler40b26032011-12-22 08:09:15 -0600314# define png_constcast(type, value) const_cast<type>(value)
John Bowler4fa96a42011-11-16 16:39:16 -0600315#else
316# define png_voidcast(type, value) (value)
John Bowler40b26032011-12-22 08:09:15 -0600317# define png_constcast(type, value) ((type)(value))
John Bowler4fa96a42011-11-16 16:39:16 -0600318#endif /* __cplusplus */
319
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500320/* Some fixed point APIs are still required even if not exported because
321 * they get used by the corresponding floating point APIs. This magic
322 * deals with this:
323 */
324#ifdef PNG_FIXED_POINT_SUPPORTED
325# define PNGFAPI PNGAPI
326#else
327# define PNGFAPI /* PRIVATE */
328#endif
329
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500330/* Other defines specific to compilers can go here. Try to keep
331 * them inside an appropriate ifdef/endif pair for portability.
332 */
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500333#if defined(PNG_FLOATING_POINT_SUPPORTED) ||\
334 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
Glenn Randers-Pehrson233357e2010-07-29 21:49:38 -0500335 /* png.c requires the following ANSI-C constants if the conversion of
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500336 * floating point to ASCII is implemented therein:
Glenn Randers-Pehrsonc36bb792011-02-12 09:49:07 -0600337 *
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500338 * DBL_DIG Maximum number of decimal digits (can be set to any constant)
Glenn Randers-Pehrson233357e2010-07-29 21:49:38 -0500339 * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value)
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500340 * DBL_MAX Maximum floating point number (can be set to an arbitrary value)
341 */
342# include <float.h>
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500343
Glenn Randers-Pehrsond00bbb22010-03-14 09:15:49 -0500344# if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
345 defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500346 /* We need to check that <math.h> hasn't already been included earlier
347 * as it seems it doesn't agree with <fp.h>, yet we should really use
348 * <fp.h> if possible.
349 */
350# if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
351# include <fp.h>
352# endif
353# else
354# include <math.h>
355# endif
356# if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
357 /* Amiga SAS/C: We must include builtin FPU functions when compiling using
358 * MATH=68881
359 */
360# include <m68881.h>
361# endif
362#endif
363
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500364/* This provides the non-ANSI (far) memory allocation routines. */
365#if defined(__TURBOC__) && defined(__MSDOS__)
366# include <mem.h>
367# include <alloc.h>
368#endif
369
370#if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \
Glenn Randers-Pehrsonf74c5ac2009-09-20 07:27:34 -0500371 defined(_WIN32) || defined(__WIN32__)
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500372# include <windows.h> /* defines _WINDOWS_ macro */
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500373#endif
374
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500375/* Moved here around 1.5.0beta36 from pngconf.h */
376/* Users may want to use these so they are not private. Any library
377 * functions that are passed far data must be model-independent.
Glenn Randers-Pehrson862cb202010-04-16 22:12:51 -0500378 */
379
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500380/* Memory model/platform independent fns */
381#ifndef PNG_ABORT
382# ifdef _WINDOWS_
383# define PNG_ABORT() ExitProcess(0)
384# else
385# define PNG_ABORT() abort()
386# endif
Glenn Randers-Pehrson862cb202010-04-16 22:12:51 -0500387#endif
388
John Bowlerbaeb6d12011-11-26 18:21:02 -0600389/* Prior to 1.6.0 if _WINDOWS_ was defined 'lstrlenA' and 'CopyMemory' were used
Glenn Randers-Pehrson4c7e8202011-11-26 19:00:01 -0600390 * in place of the ISOC90 functions; this is no longer done in 1.6.0, however
John Bowlerbaeb6d12011-11-26 18:21:02 -0600391 * the use of png_foo as a macro defined to the C function is retained.
392 */
393#define png_strlen strlen
394#define png_memcmp memcmp
395#define png_memcpy memcpy
396#define png_memset memset
Glenn Randers-Pehrson65c03392011-10-06 21:54:17 -0500397
John Bowler4e68aa72011-10-11 16:01:33 -0500398/* These macros may need to be architecture dependent. */
399#define PNG_ALIGN_NONE 0 /* do not use data alignment */
400#define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */
Glenn Randers-Pehrson65c03392011-10-06 21:54:17 -0500401#ifdef offsetof
John Bowler4e68aa72011-10-11 16:01:33 -0500402# define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */
403#else
404# define PNG_ALIGN_OFFSET -1 /* prevent the use of this */
405#endif
406#define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */
407
408#ifndef PNG_ALIGN_TYPE
409 /* Default to using aligned access optimizations and requiring alignment to a
410 * multiple of the data type size. Override in a compiler specific fashion
411 * if necessary by inserting tests here:
412 */
413# define PNG_ALIGN_TYPE PNG_ALIGN_SIZE
414#endif
415
416#if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE
417 /* This is used because in some compiler implementations non-aligned
418 * structure members are supported, so the offsetof approach below fails.
419 * Set PNG_ALIGN_TO_SIZE=0 for compiler combinations where unaligned access
420 * is good for performance. Do not do this unless you have tested the result
421 * and understand it.
422 */
423# define png_alignof(type) (sizeof (type))
424#else
425# if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET
426# define png_alignof(type) offsetof(struct{char c; type t;}, t)
427# else
428# if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS
429# define png_alignof(type) (1)
430# endif
431 /* Else leave png_alignof undefined to prevent use thereof */
432# endif
Glenn Randers-Pehrson65c03392011-10-06 21:54:17 -0500433#endif
434
435/* This implicitly assumes alignment is always to a power of 2. */
436#ifdef png_alignof
437# define png_isaligned(ptr, type)\
John Bowler4e68aa72011-10-11 16:01:33 -0500438 ((((const char*)ptr-(const char*)0) & (png_alignof(type)-1)) == 0)
Glenn Randers-Pehrson65c03392011-10-06 21:54:17 -0500439#else
440# define png_isaligned(ptr, type) 0
441#endif
442
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500443/* End of memory model/platform independent support */
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500444/* End of 1.5.0beta36 move from pngconf.h */
445
446/* CONSTANTS and UTILITY MACROS
447 * These are used internally by libpng and not exposed in the API
Glenn Randers-Pehrson862cb202010-04-16 22:12:51 -0500448 */
Glenn Randers-Pehrson9f044c12010-12-07 14:59:43 -0600449
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500450/* Various modes of operation. Note that after an init, mode is set to
Glenn Randers-Pehrson2d3fc1c2011-05-10 23:48:00 -0500451 * zero automatically when the structure is created. Three of these
452 * are defined in png.h because they need to be visible to applications
453 * that call png_set_unknown_chunk().
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500454 */
Glenn Randers-Pehrson2d3fc1c2011-05-10 23:48:00 -0500455/* #define PNG_HAVE_IHDR 0x01 (defined in png.h) */
456/* #define PNG_HAVE_PLTE 0x02 (defined in png.h) */
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500457#define PNG_HAVE_IDAT 0x04
Glenn Randers-Pehrson2d3fc1c2011-05-10 23:48:00 -0500458/* #define PNG_AFTER_IDAT 0x08 (defined in png.h) */
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500459#define PNG_HAVE_IEND 0x10
460#define PNG_HAVE_gAMA 0x20
461#define PNG_HAVE_cHRM 0x40
462#define PNG_HAVE_sRGB 0x80
463#define PNG_HAVE_CHUNK_HEADER 0x100
464#define PNG_WROTE_tIME 0x200
465#define PNG_WROTE_INFO_BEFORE_PLTE 0x400
466#define PNG_BACKGROUND_IS_GRAY 0x800
467#define PNG_HAVE_PNG_SIGNATURE 0x1000
Glenn Randers-Pehrson6bc53be2006-06-16 07:52:03 -0500468#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
Glenn Randers-Pehrson6038b802012-03-08 10:40:07 -0600469#define PNG_HAVE_iCCP 0x4000
John Bowlerb5d00512012-03-09 09:15:18 -0600470#define PNG_IS_READ_STRUCT 0x8000 /* Else is a write struct */
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500471
Glenn Randers-Pehrson6c7a09a2009-06-15 21:57:39 -0500472/* Flags for the transformations the PNG library does on the image data */
Glenn Randers-Pehrson1916f6a2008-08-14 13:44:49 -0500473#define PNG_BGR 0x0001
474#define PNG_INTERLACE 0x0002
475#define PNG_PACK 0x0004
476#define PNG_SHIFT 0x0008
477#define PNG_SWAP_BYTES 0x0010
478#define PNG_INVERT_MONO 0x0020
Glenn Randers-Pehrson3cd7cff2010-04-16 19:27:08 -0500479#define PNG_QUANTIZE 0x0040
John Bowlerd273ad22011-05-07 21:00:28 -0500480#define PNG_COMPOSE 0x0080 /* Was PNG_BACKGROUND */
Glenn Randers-Pehrson1916f6a2008-08-14 13:44:49 -0500481#define PNG_BACKGROUND_EXPAND 0x0100
John Bowler4d562962011-02-12 09:01:20 -0600482#define PNG_EXPAND_16 0x0200 /* Added to libpng 1.5.2 */
John Bowler8d261262011-06-18 13:37:11 -0500483#define PNG_16_TO_8 0x0400 /* Becomes 'chop' in 1.5.4 */
Glenn Randers-Pehrson1916f6a2008-08-14 13:44:49 -0500484#define PNG_RGBA 0x0800
485#define PNG_EXPAND 0x1000
486#define PNG_GAMMA 0x2000
487#define PNG_GRAY_TO_RGB 0x4000
Glenn Randers-Pehrsond3261112011-09-15 08:12:08 -0500488#define PNG_FILLER 0x8000
489#define PNG_PACKSWAP 0x10000
490#define PNG_SWAP_ALPHA 0x20000
491#define PNG_STRIP_ALPHA 0x40000
492#define PNG_INVERT_ALPHA 0x80000
493#define PNG_USER_TRANSFORM 0x100000
494#define PNG_RGB_TO_GRAY_ERR 0x200000
495#define PNG_RGB_TO_GRAY_WARN 0x400000
496#define PNG_RGB_TO_GRAY 0x600000 /* two bits, RGB_TO_GRAY_ERR|WARN */
497#define PNG_ENCODE_ALPHA 0x800000 /* Added to libpng-1.5.4 */
498#define PNG_ADD_ALPHA 0x1000000 /* Added to libpng-1.2.7 */
499#define PNG_EXPAND_tRNS 0x2000000 /* Added to libpng-1.2.9 */
500#define PNG_SCALE_16_TO_8 0x4000000 /* Added to libpng-1.5.4 */
501 /* 0x8000000 unused */
502 /* 0x10000000 unused */
503 /* 0x20000000 unused */
504 /* 0x40000000 unused */
Glenn Randers-Pehrson6c7a09a2009-06-15 21:57:39 -0500505/* Flags for png_create_struct */
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500506#define PNG_STRUCT_PNG 0x0001
507#define PNG_STRUCT_INFO 0x0002
508
509/* Scaling factor for filter heuristic weighting calculations */
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500510#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500511#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
512
Glenn Randers-Pehrson6c7a09a2009-06-15 21:57:39 -0500513/* Flags for the png_ptr->flags rather than declaring a byte for each one */
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500514#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
John Bowler42a2b552012-03-05 20:57:40 -0600515#define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002 /* Added to libpng-1.6.0 */
John Bowlerb5d00512012-03-09 09:15:18 -0600516 /* 0x0004 unused */
John Bowler42a2b552012-03-05 20:57:40 -0600517#define PNG_FLAG_ZSTREAM_ENDED 0x0008 /* Added to libpng-1.6.0 */
John Bowlerb5d00512012-03-09 09:15:18 -0600518 /* 0x0010 unused */
John Bowler42a2b552012-03-05 20:57:40 -0600519 /* 0x0020 unused */
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500520#define PNG_FLAG_ROW_INIT 0x0040
521#define PNG_FLAG_FILLER_AFTER 0x0080
522#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
523#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
524#define PNG_FLAG_CRC_CRITICAL_USE 0x0400
525#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
John Bowler42a2b552012-03-05 20:57:40 -0600526#define PNG_FLAG_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.4 */
527#define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.4 */
528#define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.4 */
John Bowlerf3f7e142011-09-09 07:32:37 -0500529#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000
John Bowler42a2b552012-03-05 20:57:40 -0600530#define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000
531#define PNG_FLAG_LIBRARY_MISMATCH 0x20000
532#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000
533#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000
534#define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000 /* Added to libpng-1.4.0 */
535 /* 0x200000 unused */
536 /* 0x400000 unused */
537 /* 0x800000 unused */
538 /* 0x1000000 unused */
539 /* 0x2000000 unused */
540 /* 0x4000000 unused */
541 /* 0x8000000 unused */
542 /* 0x10000000 unused */
543 /* 0x20000000 unused */
544 /* 0x40000000 unused */
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500545
546#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
547 PNG_FLAG_CRC_ANCILLARY_NOWARN)
548
549#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
550 PNG_FLAG_CRC_CRITICAL_IGNORE)
551
552#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
553 PNG_FLAG_CRC_CRITICAL_MASK)
554
Glenn Randers-Pehrson6c7a09a2009-06-15 21:57:39 -0500555/* Save typing and make code easier to understand */
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500556
557#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
558 abs((int)((c1).green) - (int)((c2).green)) + \
559 abs((int)((c1).blue) - (int)((c2).blue)))
560
Glenn Randers-Pehrsonefc4b692011-11-07 23:31:34 -0600561/* Added to libpng-1.5.7: sRGB conversion tables */
Glenn Randers-Pehrson85964682011-11-16 08:52:36 -0600562#if defined PNG_SIMPLIFIED_READ_SUPPORTED ||\
563 defined PNG_SIMPLIFIED_WRITE_SUPPORTED
John Bowler7875d532011-11-07 22:33:49 -0600564#ifdef PNG_SIMPLIFIED_READ_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -0600565PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]);
John Bowler7875d532011-11-07 22:33:49 -0600566 /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value,
John Bowler5bc90382012-01-23 22:43:22 -0600567 * 0..65535. This table gives the closest 16-bit answers (no errors).
John Bowler7875d532011-11-07 22:33:49 -0600568 */
569#endif
570
John Bowler572b0782012-01-31 07:09:34 -0600571PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]);
572PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]);
John Bowler7875d532011-11-07 22:33:49 -0600573
John Bowler5bc90382012-01-23 22:43:22 -0600574#define PNG_sRGB_FROM_LINEAR(linear) ((png_byte)((png_sRGB_base[(linear)>>15] +\
575 ((((linear)&0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8))
John Bowler7875d532011-11-07 22:33:49 -0600576 /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB
577 * encoded value with maximum error 0.646365. Note that the input is not a
578 * 16-bit value; it has been multiplied by 255! */
Glenn Randers-Pehrson85964682011-11-16 08:52:36 -0600579#endif /* PNG_SIMPLIFIED_READ/WRITE */
John Bowler7875d532011-11-07 22:33:49 -0600580
John Bowler5bc90382012-01-23 22:43:22 -0600581/* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255
582 * by dividing by 257 *with rounding*. This macro is exact for the given range.
583 * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the
584 * macro were established by experiment (modifying the added value). The macro
585 * has a second variant that takes a value already scaled by 255 and divides by
586 * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it
587 * only gives off-by-one errors and only for 0.5% (1 in 200) of the values.
588 */
589#define PNG_DIV65535(v24) (((v24) + 32895) >> 16)
590#define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255)
591
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500592/* Added to libpng-1.2.6 JB */
593#define PNG_ROWBYTES(pixel_bits, width) \
594 ((pixel_bits) >= 8 ? \
Glenn Randers-Pehrsonbeb572e2006-08-19 13:59:24 -0500595 ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \
596 (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) )
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500597
598/* PNG_OUT_OF_RANGE returns true if value is outside the range
Glenn Randers-Pehrson9bf60832009-09-20 13:37:50 -0500599 * ideal-delta..ideal+delta. Each argument is evaluated twice.
600 * "ideal" and "delta" should be constants, normally simple
601 * integers, "value" a variable. Added to libpng-1.2.6 JB
602 */
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500603#define PNG_OUT_OF_RANGE(value, ideal, delta) \
Glenn Randers-Pehrsone8b1aa02010-03-06 11:39:29 -0600604 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500605
Glenn Randers-Pehrson363f96e2010-08-11 09:00:26 -0500606/* Conversions between fixed and floating point, only defined if
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500607 * required (to make sure the code doesn't accidentally use float
608 * when it is supposedly disabled.)
609 */
610#ifdef PNG_FLOATING_POINT_SUPPORTED
Glenn Randers-Pehrson233357e2010-07-29 21:49:38 -0500611/* The floating point conversion can't overflow, though it can and
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500612 * does lose accuracy relative to the original fixed point value.
613 * In practice this doesn't matter because png_fixed_point only
614 * stores numbers with very low precision. The png_ptr and s
615 * arguments are unused by default but are there in case error
616 * checking becomes a requirement.
617 */
618#define png_float(png_ptr, fixed, s) (.00001 * (fixed))
619
Glenn Randers-Pehrson233357e2010-07-29 21:49:38 -0500620/* The fixed point conversion performs range checking and evaluates
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500621 * its argument multiple times, so must be used with care. The
622 * range checking uses the PNG specification values for a signed
623 * 32 bit fixed point value except that the values are deliberately
Glenn Randers-Pehrson9f044c12010-12-07 14:59:43 -0600624 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly
625 * (2^31-1) * 100000). 's' is a string that describes the value being
626 * converted.
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500627 *
628 * NOTE: this macro will raise a png_error if the range check fails,
629 * therefore it is normally only appropriate to use this on values
630 * that come from API calls or other sources where an out of range
631 * error indicates a programming error, not a data error!
632 *
633 * NOTE: by default this is off - the macro is not used - because the
634 * function call saves a lot of code.
635 */
636#ifdef PNG_FIXED_POINT_MACRO_SUPPORTED
637#define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\
Glenn Randers-Pehrson48dc6eb2010-07-31 07:09:58 -0500638 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0))
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500639#endif
John Bowlerbce79882012-02-13 11:45:22 -0600640/* else the corresponding function is defined below, inside the scope of the
John Bowler572b0782012-01-31 07:09:34 -0600641 * cplusplus test.
642 */
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500643#endif
644
Glenn Randers-Pehrsonbb5cb142011-09-22 12:41:58 -0500645/* Constants for known chunk types. If you need to add a chunk, define the name
646 * here. For historical reasons these constants have the form png_<name>; i.e.
647 * the prefix is lower case. Please use decimal values as the parameters to
648 * match the ISO PNG specification and to avoid relying on the C locale
649 * interpretation of character values.
650 *
651 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values
652 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string
653 * to be generated if required.
654 *
655 * PNG_32b correctly produces a value shifted by up to 24 bits, even on
656 * architectures where (int) is only 16 bits.
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500657 */
Glenn Randers-Pehrsonbb5cb142011-09-22 12:41:58 -0500658#define PNG_32b(b,s) ((png_uint_32)(b) << (s))
659#define PNG_CHUNK(b1,b2,b3,b4) \
660 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0))
661
662#define png_IHDR PNG_CHUNK( 73, 72, 68, 82)
663#define png_IDAT PNG_CHUNK( 73, 68, 65, 84)
664#define png_IEND PNG_CHUNK( 73, 69, 78, 68)
665#define png_PLTE PNG_CHUNK( 80, 76, 84, 69)
666#define png_bKGD PNG_CHUNK( 98, 75, 71, 68)
667#define png_cHRM PNG_CHUNK( 99, 72, 82, 77)
668#define png_gAMA PNG_CHUNK(103, 65, 77, 65)
669#define png_hIST PNG_CHUNK(104, 73, 83, 84)
670#define png_iCCP PNG_CHUNK(105, 67, 67, 80)
671#define png_iTXt PNG_CHUNK(105, 84, 88, 116)
672#define png_oFFs PNG_CHUNK(111, 70, 70, 115)
673#define png_pCAL PNG_CHUNK(112, 67, 65, 76)
674#define png_sCAL PNG_CHUNK(115, 67, 65, 76)
675#define png_pHYs PNG_CHUNK(112, 72, 89, 115)
676#define png_sBIT PNG_CHUNK(115, 66, 73, 84)
677#define png_sPLT PNG_CHUNK(115, 80, 76, 84)
678#define png_sRGB PNG_CHUNK(115, 82, 71, 66)
679#define png_sTER PNG_CHUNK(115, 84, 69, 82)
680#define png_tEXt PNG_CHUNK(116, 69, 88, 116)
681#define png_tIME PNG_CHUNK(116, 73, 77, 69)
682#define png_tRNS PNG_CHUNK(116, 82, 78, 83)
683#define png_zTXt PNG_CHUNK(122, 84, 88, 116)
684
685/* The following will work on (signed char*) strings, whereas the get_uint_32
686 * macro will fail on top-bit-set values because of the sign extension.
687 */
688#define PNG_CHUNK_FROM_STRING(s)\
689 PNG_CHUNK(0xff&(s)[0], 0xff&(s)[1], 0xff&(s)[2], 0xff&(s)[3])
690
691/* This uses (char), not (png_byte) to avoid warnings on systems where (char) is
692 * signed and the argument is a (char[]) This macro will fail miserably on
693 * systems where (char) is more than 8 bits.
694 */
695#define PNG_STRING_FROM_CHUNK(s,c)\
696 (void)(((char*)(s))[0]=(char)((c)>>24), ((char*)(s))[1]=(char)((c)>>16),\
Glenn Randers-Pehrsond02d6a12011-09-26 16:43:08 -0500697 ((char*)(s))[2]=(char)((c)>>8), ((char*)(s))[3]=(char)((c)))
Glenn Randers-Pehrsonbb5cb142011-09-22 12:41:58 -0500698
699/* Do the same but terminate with a null character. */
700#define PNG_CSTRING_FROM_CHUNK(s,c)\
701 (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0)
702
703/* Test on flag values as defined in the spec (section 5.4): */
704#define PNG_CHUNK_ANCILLIARY(c) (1 & ((c) >> 29))
705#define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLIARY(c))
706#define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21))
707#define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13))
708#define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5))
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500709
Glenn Randers-Pehrsonef217b72011-06-15 12:58:27 -0500710/* Gamma values (new at libpng-1.5.4): */
John Bowlerf70c7d02011-05-10 22:54:37 -0500711#define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */
712#define PNG_GAMMA_MAC_INVERSE 65909
713#define PNG_GAMMA_sRGB_INVERSE 45455
714
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500715
716/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
717#ifdef __cplusplus
718extern "C" {
719#endif /* __cplusplus */
720
John Bowlerd332c672011-12-21 17:36:12 -0600721/* Internal functions; these are not exported from a DLL however because they
722 * are used within several of the C source files they have to be C extern.
John Bowler572b0782012-01-31 07:09:34 -0600723 *
724 * All of these functions must be declared with PNG_INTERNAL_FUNCTION.
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500725 */
726
John Bowler42a2b552012-03-05 20:57:40 -0600727/* Zlib support */
John Bowlerb5d00512012-03-09 09:15:18 -0600728#define PNG_UNEXPECTED_ZLIB_RETURN (-7)
729PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret),
730 PNG_EMPTY);
731 /* Used by the zlib handling functions to ensure that z_stream::msg is always
732 * set before they return.
733 */
734
735#ifdef PNG_WRITE_SUPPORTED
736PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr,
737 png_compression_bufferp *list),PNG_EMPTY);
738 /* Free the buffer list used by the compressed write code. */
739#endif
John Bowler42a2b552012-03-05 20:57:40 -0600740
John Bowler572b0782012-01-31 07:09:34 -0600741#if defined PNG_FLOATING_POINT_SUPPORTED &&\
742 !defined PNG_FIXED_POINT_MACRO_SUPPORTED
743PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr,
744 double fp, png_const_charp text),PNG_EMPTY);
745#endif
746
John Bowler88b77cc2011-05-05 06:49:55 -0500747/* Check the user version string for compatibility, returns false if the version
748 * numbers aren't compatible.
749 */
John Bowler572b0782012-01-31 07:09:34 -0600750PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr,
751 png_const_charp user_png_ver),PNG_EMPTY);
John Bowler88b77cc2011-05-05 06:49:55 -0500752
John Bowlerd332c672011-12-21 17:36:12 -0600753/* Internal base allocator - no messages, NULL on failure to allocate. This
754 * does, however, call the application provided allocator and that could call
755 * png_error (although that would be a bug in the application implementation.)
756 */
John Bowler572b0782012-01-31 07:09:34 -0600757PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr,
758 png_alloc_size_t size),PNG_ALLOCATED);
John Bowlerd332c672011-12-21 17:36:12 -0600759
760/* Magic to create a struct when there is no struct to call the user supplied
761 * memory allocators. Because error handling has not been set up the memory
762 * handlers can't safely call png_error, but this is an obscure and undocumented
763 * restriction so libpng has to assume that the 'free' handler, at least, might
764 * call png_error.
765 */
John Bowler572b0782012-01-31 07:09:34 -0600766PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct,
767 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
768 png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn,
769 png_free_ptr free_fn),PNG_ALLOCATED);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500770
771/* Free memory from internal libpng struct */
John Bowler572b0782012-01-31 07:09:34 -0600772PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr),
773 PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500774
John Bowlerd332c672011-12-21 17:36:12 -0600775/* Free an allocated jmp_buf (always succeeds) */
John Bowler572b0782012-01-31 07:09:34 -0600776PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY);
John Bowlerd332c672011-12-21 17:36:12 -0600777
Glenn Randers-Pehrsonbeb572e2006-08-19 13:59:24 -0500778/* Function to allocate memory for zlib. PNGAPI is disallowed. */
John Bowler572b0782012-01-31 07:09:34 -0600779PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size),
780 PNG_ALLOCATED);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500781
Glenn Randers-Pehrsonbeb572e2006-08-19 13:59:24 -0500782/* Function to free memory for zlib. PNGAPI is disallowed. */
John Bowler572b0782012-01-31 07:09:34 -0600783PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500784
Glenn Randers-Pehrsoneae8e362010-03-12 17:36:53 -0600785/* Next four functions are used internally as callbacks. PNGCBAPI is required
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500786 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to
787 * PNGCBAPI at 1.5.0
Glenn Randers-Pehrsoneae8e362010-03-12 17:36:53 -0600788 */
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500789
John Bowler572b0782012-01-31 07:09:34 -0600790PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr,
791 png_bytep data, png_size_t length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500792
793#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -0600794PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr,
795 png_bytep buffer, png_size_t length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500796#endif
797
John Bowler572b0782012-01-31 07:09:34 -0600798PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr,
799 png_bytep data, png_size_t length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500800
Glenn Randers-Pehrsondbd40142009-08-31 08:42:02 -0500801#ifdef PNG_WRITE_FLUSH_SUPPORTED
Glenn Randers-Pehrsond4df36c2010-03-06 10:45:55 -0600802# ifdef PNG_STDIO_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -0600803PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr),
804 PNG_EMPTY);
Glenn Randers-Pehrsond4df36c2010-03-06 10:45:55 -0600805# endif
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500806#endif
807
808/* Reset the CRC variable */
John Bowler572b0782012-01-31 07:09:34 -0600809PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500810
Glenn Randers-Pehrsonbeb572e2006-08-19 13:59:24 -0500811/* Write the "data" buffer to whatever output you are using */
John Bowler572b0782012-01-31 07:09:34 -0600812PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr,
813 png_const_bytep data, png_size_t length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500814
Glenn Randers-Pehrsona5815562010-11-20 21:48:29 -0600815/* Read and check the PNG file signature */
John Bowler572b0782012-01-31 07:09:34 -0600816PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr,
817 png_inforp info_ptr),PNG_EMPTY);
Glenn Randers-Pehrsona5815562010-11-20 21:48:29 -0600818
Glenn Randers-Pehrsonbeb572e2006-08-19 13:59:24 -0500819/* Read the chunk header (length + type name) */
John Bowler572b0782012-01-31 07:09:34 -0600820PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr),
821 PNG_EMPTY);
Glenn Randers-Pehrsonbeb572e2006-08-19 13:59:24 -0500822
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500823/* Read data from whatever input you are using into the "data" buffer */
John Bowler572b0782012-01-31 07:09:34 -0600824PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data,
825 png_size_t length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500826
827/* Read bytes into buf, and update png_ptr->crc */
John Bowler572b0782012-01-31 07:09:34 -0600828PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf,
John Bowler0ae4f7b2012-03-03 21:10:26 -0600829 png_uint_32 length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500830
831/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
John Bowler572b0782012-01-31 07:09:34 -0600832PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr,
833 png_uint_32 skip),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500834
835/* Read the CRC from the file and compare it to the libpng calculated CRC */
John Bowler572b0782012-01-31 07:09:34 -0600836PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500837
838/* Calculate the CRC over a section of data. Note that we are only
839 * passing a maximum of 64K on systems that have this as a memory limit,
840 * since this is the maximum buffer size we can specify.
841 */
John Bowler572b0782012-01-31 07:09:34 -0600842PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr,
843 png_const_bytep ptr, png_size_t length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500844
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -0500845#ifdef PNG_WRITE_FLUSH_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -0600846PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500847#endif
848
Glenn Randers-Pehrson6c7a09a2009-06-15 21:57:39 -0500849/* Write various chunks */
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500850
851/* Write the IHDR chunk, and update the png_struct with the necessary
852 * information.
853 */
John Bowlerb5d00512012-03-09 09:15:18 -0600854PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr,
855 png_uint_32 width, png_uint_32 height, int bit_depth, int color_type,
856 int compression_method, int filter_method, int interlace_method),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500857
John Bowler572b0782012-01-31 07:09:34 -0600858PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr,
859 png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500860
John Bowlerb5d00512012-03-09 09:15:18 -0600861PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr,
862 png_const_bytep row_data, png_alloc_size_t row_data_length, int flush),
863 PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500864
John Bowler572b0782012-01-31 07:09:34 -0600865PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500866
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -0500867#ifdef PNG_WRITE_gAMA_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -0600868PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr,
869 png_fixed_point file_gamma),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500870#endif
871
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -0500872#ifdef PNG_WRITE_sBIT_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -0600873PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr,
874 png_const_color_8p sbit, int color_type),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500875#endif
876
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -0500877#ifdef PNG_WRITE_cHRM_SUPPORTED
Glenn Randers-Pehrsond4df36c2010-03-06 10:45:55 -0600878# ifdef PNG_FLOATING_POINT_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -0600879PNG_INTERNAL_FUNCTION(void,png_write_cHRM,(png_structrp png_ptr,
Glenn Randers-Pehrsone8b1aa02010-03-06 11:39:29 -0600880 double white_x, double white_y,
881 double red_x, double red_y, double green_x, double green_y,
John Bowler572b0782012-01-31 07:09:34 -0600882 double blue_x, double blue_y),PNG_EMPTY);
Glenn Randers-Pehrsond4df36c2010-03-06 10:45:55 -0600883# endif
John Bowler572b0782012-01-31 07:09:34 -0600884PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr,
Glenn Randers-Pehrsone8b1aa02010-03-06 11:39:29 -0600885 png_fixed_point int_white_x, png_fixed_point int_white_y,
886 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
887 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
John Bowler572b0782012-01-31 07:09:34 -0600888 png_fixed_point int_blue_y),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500889#endif
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500890
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -0500891#ifdef PNG_WRITE_sRGB_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -0600892PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr,
893 int intent),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500894#endif
895
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -0500896#ifdef PNG_WRITE_iCCP_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -0600897PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr,
Glenn Randers-Pehrsone600c512010-08-18 07:25:46 -0500898 png_const_charp name, int compression_type,
John Bowlercf499192012-03-01 21:54:07 -0600899 png_const_bytep profile, png_uint_32 proflen),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500900 /* Note to maintainer: profile should be png_bytep */
901#endif
902
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -0500903#ifdef PNG_WRITE_sPLT_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -0600904PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr,
905 png_const_sPLT_tp palette),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500906#endif
907
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -0500908#ifdef PNG_WRITE_tRNS_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -0600909PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr,
Glenn Randers-Pehrsone600c512010-08-18 07:25:46 -0500910 png_const_bytep trans, png_const_color_16p values, int number,
John Bowler572b0782012-01-31 07:09:34 -0600911 int color_type),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500912#endif
913
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -0500914#ifdef PNG_WRITE_bKGD_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -0600915PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr,
916 png_const_color_16p values, int color_type),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500917#endif
918
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -0500919#ifdef PNG_WRITE_hIST_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -0600920PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr,
921 png_const_uint_16p hist, int num_hist),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500922#endif
923
Glenn Randers-Pehrson205483d2011-04-01 12:33:42 -0500924/* Chunks that have keywords */
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -0500925#ifdef PNG_WRITE_tEXt_SUPPORTED
John Bowlerb5d00512012-03-09 09:15:18 -0600926PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr,
927 png_const_charp key, png_const_charp text, png_size_t text_len),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500928#endif
929
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -0500930#ifdef PNG_WRITE_zTXt_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -0600931PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp key,
932 png_const_charp text, png_size_t text_len, int compression),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500933#endif
934
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -0500935#ifdef PNG_WRITE_iTXt_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -0600936PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr,
Glenn Randers-Pehrsone600c512010-08-18 07:25:46 -0500937 int compression, png_const_charp key, png_const_charp lang,
John Bowler572b0782012-01-31 07:09:34 -0600938 png_const_charp lang_key, png_const_charp text),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500939#endif
940
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -0500941#ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */
John Bowler572b0782012-01-31 07:09:34 -0600942PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr,
943 png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500944#endif
945
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -0500946#ifdef PNG_WRITE_oFFs_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -0600947PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr,
948 png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500949#endif
950
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -0500951#ifdef PNG_WRITE_pCAL_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -0600952PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr, png_charp purpose,
Glenn Randers-Pehrsone8b1aa02010-03-06 11:39:29 -0600953 png_int_32 X0, png_int_32 X1, int type, int nparams,
John Bowler572b0782012-01-31 07:09:34 -0600954 png_const_charp units, png_charpp params),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500955#endif
956
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -0500957#ifdef PNG_WRITE_pHYs_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -0600958PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr,
Glenn Randers-Pehrsone8b1aa02010-03-06 11:39:29 -0600959 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
John Bowler572b0782012-01-31 07:09:34 -0600960 int unit_type),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500961#endif
962
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -0500963#ifdef PNG_WRITE_tIME_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -0600964PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr,
965 png_const_timep mod_time),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500966#endif
967
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -0500968#ifdef PNG_WRITE_sCAL_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -0600969PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr,
970 int unit, png_const_charp width, png_const_charp height),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500971#endif
972
973/* Called when finished processing a row of data */
John Bowler572b0782012-01-31 07:09:34 -0600974PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500975
976/* Internal use only. Called before first row of data */
John Bowler572b0782012-01-31 07:09:34 -0600977PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500978
Glenn Randers-Pehrsonbb5cb142011-09-22 12:41:58 -0500979/* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an
Glenn Randers-Pehrson65c03392011-10-06 21:54:17 -0500980 * array of png_ptr->width pixels. If the image is not interlaced or this
981 * is the final pass this just does a png_memcpy, otherwise the "display" flag
982 * is used to determine whether to copy pixels that are not in the current pass.
983 *
984 * Because 'png_do_read_interlace' (below) replicates pixels this allows this
985 * function to achieve the documented 'blocky' appearance during interlaced read
986 * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row'
987 * are not changed if they are not in the current pass, when display is 0.
988 *
989 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless.
990 *
991 * The API always reads from the png_struct row buffer and always assumes that
992 * it is full width (png_do_read_interlace has already been called.)
993 *
994 * This function is only ever used to write to row buffers provided by the
995 * caller of the relevant libpng API and the row must have already been
996 * transformed by the read transformations.
John Bowler4e68aa72011-10-11 16:01:33 -0500997 *
998 * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed
999 * bitmasks for use within the code, otherwise runtime generated masks are used.
1000 * The default is compile time masks.
Glenn Randers-Pehrsonbb5cb142011-09-22 12:41:58 -05001001 */
John Bowler4e68aa72011-10-11 16:01:33 -05001002#ifndef PNG_USE_COMPILE_TIME_MASKS
1003# define PNG_USE_COMPILE_TIME_MASKS 1
1004#endif
John Bowler572b0782012-01-31 07:09:34 -06001005PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr,
1006 png_bytep row, int display),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001007
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001008#ifdef PNG_READ_INTERLACING_SUPPORTED
Glenn Randers-Pehrson65c03392011-10-06 21:54:17 -05001009/* Expand an interlaced row: the 'row_info' describes the pass data that has
1010 * been read in and must correspond to the pixels in 'row', the pixels are
1011 * expanded (moved apart) in 'row' to match the final layout, when doing this
1012 * the pixels are *replicated* to the intervening space. This is essential for
1013 * the correct operation of png_combine_row, above.
1014 */
John Bowler572b0782012-01-31 07:09:34 -06001015PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info,
1016 png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001017#endif
1018
1019/* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
1020
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001021#ifdef PNG_WRITE_INTERLACING_SUPPORTED
Glenn Randers-Pehrson6c7a09a2009-06-15 21:57:39 -05001022/* Grab pixels out of a row for an interlaced pass */
John Bowler572b0782012-01-31 07:09:34 -06001023PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info,
1024 png_bytep row, int pass),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001025#endif
1026
Glenn Randers-Pehrsonbb5cb142011-09-22 12:41:58 -05001027/* Unfilter a row: check the filter value before calling this, there is no point
1028 * calling it for PNG_FILTER_VALUE_NONE.
1029 */
John Bowler572b0782012-01-31 07:09:34 -06001030PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop row_info,
1031 png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001032
John Bowler572b0782012-01-31 07:09:34 -06001033PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info,
1034 png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1035PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop row_info,
1036 png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1037PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop row_info,
1038 png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1039PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop row_info,
1040 png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1041PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop row_info,
1042 png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1043PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop row_info,
1044 png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1045PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop row_info,
1046 png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
Mans Rullgardd3a94802011-11-03 00:47:55 -05001047
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001048/* Choose the best filter to use and filter the row data */
John Bowler572b0782012-01-31 07:09:34 -06001049PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr,
1050 png_row_infop row_info),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001051
John Bowlerb5d00512012-03-09 09:15:18 -06001052#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1053PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr,
1054 png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY);
1055 /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer
1056 * is NULL the function checks, instead, for the end of the stream. In this
1057 * case a benign error will be issued if the stream end is not found or if
1058 * extra data has to be consumed.
1059 */
1060PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr),
1061 PNG_EMPTY);
1062 /* This cleans up when the IDAT LZ stream does not end when the last image
1063 * byte is read; there is still some pending input.
1064 */
1065
1066PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr),
1067 PNG_EMPTY);
1068 /* Finish a row while reading, dealing with interlacing passes, etc. */
1069#endif
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001070
Glenn Randers-Pehrson6c7a09a2009-06-15 21:57:39 -05001071/* Initialize the row buffers, etc. */
John Bowler572b0782012-01-31 07:09:34 -06001072PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY);
John Bowler4a12f4a2011-04-17 18:34:22 -05001073
1074#ifdef PNG_READ_TRANSFORMS_SUPPORTED
Glenn Randers-Pehrson6c7a09a2009-06-15 21:57:39 -05001075/* Optional call to update the users info structure */
John Bowler572b0782012-01-31 07:09:34 -06001076PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr,
1077 png_inforp info_ptr),PNG_EMPTY);
John Bowler4a12f4a2011-04-17 18:34:22 -05001078#endif
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001079
Glenn Randers-Pehrson6c7a09a2009-06-15 21:57:39 -05001080/* These are the functions that do the transformations */
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001081#ifdef PNG_READ_FILLER_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001082PNG_INTERNAL_FUNCTION(void,png_do_read_filler,(png_row_infop row_info,
1083 png_bytep row, png_uint_32 filler, png_uint_32 flags),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001084#endif
1085
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001086#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001087PNG_INTERNAL_FUNCTION(void,png_do_read_swap_alpha,(png_row_infop row_info,
1088 png_bytep row),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001089#endif
1090
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001091#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001092PNG_INTERNAL_FUNCTION(void,png_do_write_swap_alpha,(png_row_infop row_info,
1093 png_bytep row),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001094#endif
1095
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001096#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001097PNG_INTERNAL_FUNCTION(void,png_do_read_invert_alpha,(png_row_infop row_info,
1098 png_bytep row),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001099#endif
1100
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001101#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001102PNG_INTERNAL_FUNCTION(void,png_do_write_invert_alpha,(png_row_infop row_info,
1103 png_bytep row),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001104#endif
1105
1106#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
1107 defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
John Bowler572b0782012-01-31 07:09:34 -06001108PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info,
1109 png_bytep row, int at_start),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001110#endif
1111
Glenn Randers-Pehrson39515c92010-08-28 06:21:35 -05001112#ifdef PNG_16BIT_SUPPORTED
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001113#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
John Bowler572b0782012-01-31 07:09:34 -06001114PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info,
1115 png_bytep row),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001116#endif
Glenn Randers-Pehrson39515c92010-08-28 06:21:35 -05001117#endif
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001118
Glenn Randers-Pehrsone3f3c4e2010-02-07 18:08:50 -06001119#if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
1120 defined(PNG_WRITE_PACKSWAP_SUPPORTED)
John Bowler572b0782012-01-31 07:09:34 -06001121PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info,
1122 png_bytep row),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001123#endif
1124
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001125#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001126PNG_INTERNAL_FUNCTION(int,png_do_rgb_to_gray,(png_structrp png_ptr,
1127 png_row_infop row_info, png_bytep row),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001128#endif
1129
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001130#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001131PNG_INTERNAL_FUNCTION(void,png_do_gray_to_rgb,(png_row_infop row_info,
1132 png_bytep row),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001133#endif
1134
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001135#ifdef PNG_READ_PACK_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001136PNG_INTERNAL_FUNCTION(void,png_do_unpack,(png_row_infop row_info,
1137 png_bytep row),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001138#endif
1139
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001140#ifdef PNG_READ_SHIFT_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001141PNG_INTERNAL_FUNCTION(void,png_do_unshift,(png_row_infop row_info,
1142 png_bytep row, png_const_color_8p sig_bits),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001143#endif
1144
1145#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
John Bowler572b0782012-01-31 07:09:34 -06001146PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info,
1147 png_bytep row),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001148#endif
1149
John Bowler8d261262011-06-18 13:37:11 -05001150#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001151PNG_INTERNAL_FUNCTION(void,png_do_scale_16_to_8,(png_row_infop row_info,
1152 png_bytep row),PNG_EMPTY);
Glenn Randers-Pehrson5f0b9272011-06-16 09:05:40 -05001153#endif
John Bowler550bab02011-06-14 06:17:26 -05001154
Glenn Randers-Pehrsonab63dd02011-06-17 20:04:17 -05001155#ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001156PNG_INTERNAL_FUNCTION(void,png_do_chop,(png_row_infop row_info,
1157 png_bytep row),PNG_EMPTY);
Glenn Randers-Pehrson2232baa2011-06-14 06:59:46 -05001158#endif
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001159
Glenn Randers-Pehrson3cd7cff2010-04-16 19:27:08 -05001160#ifdef PNG_READ_QUANTIZE_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001161PNG_INTERNAL_FUNCTION(void,png_do_quantize,(png_row_infop row_info,
Glenn Randers-Pehrsone600c512010-08-18 07:25:46 -05001162 png_bytep row, png_const_bytep palette_lookup,
John Bowler572b0782012-01-31 07:09:34 -06001163 png_const_bytep quantize_lookup),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001164
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001165# ifdef PNG_CORRECT_PALETTE_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001166PNG_INTERNAL_FUNCTION(void,png_correct_palette,(png_structrp png_ptr,
1167 png_colorp palette, int num_palette),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001168# endif
1169#endif
1170
1171#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
John Bowler572b0782012-01-31 07:09:34 -06001172PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info,
1173 png_bytep row),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001174#endif
1175
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001176#ifdef PNG_WRITE_PACK_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001177PNG_INTERNAL_FUNCTION(void,png_do_pack,(png_row_infop row_info,
1178 png_bytep row, png_uint_32 bit_depth),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001179#endif
1180
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001181#ifdef PNG_WRITE_SHIFT_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001182PNG_INTERNAL_FUNCTION(void,png_do_shift,(png_row_infop row_info,
1183 png_bytep row, png_const_color_8p bit_depth),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001184#endif
1185
John Bowlerd273ad22011-05-07 21:00:28 -05001186#if defined(PNG_READ_BACKGROUND_SUPPORTED) ||\
1187 defined(PNG_READ_ALPHA_MODE_SUPPORTED)
John Bowler572b0782012-01-31 07:09:34 -06001188PNG_INTERNAL_FUNCTION(void,png_do_compose,(png_row_infop row_info,
1189 png_bytep row, png_structrp png_ptr),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001190#endif
1191
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001192#ifdef PNG_READ_GAMMA_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001193PNG_INTERNAL_FUNCTION(void,png_do_gamma,(png_row_infop row_info,
1194 png_bytep row, png_structrp png_ptr),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001195#endif
1196
John Bowlerd273ad22011-05-07 21:00:28 -05001197#ifdef PNG_READ_ALPHA_MODE_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001198PNG_INTERNAL_FUNCTION(void,png_do_encode_alpha,(png_row_infop row_info,
1199 png_bytep row, png_structrp png_ptr),PNG_EMPTY);
John Bowlerd273ad22011-05-07 21:00:28 -05001200#endif
1201
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001202#ifdef PNG_READ_EXPAND_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001203PNG_INTERNAL_FUNCTION(void,png_do_expand_palette,(png_row_infop row_info,
Glenn Randers-Pehrsone600c512010-08-18 07:25:46 -05001204 png_bytep row, png_const_colorp palette, png_const_bytep trans,
John Bowler572b0782012-01-31 07:09:34 -06001205 int num_trans),PNG_EMPTY);
1206PNG_INTERNAL_FUNCTION(void,png_do_expand,(png_row_infop row_info,
1207 png_bytep row, png_const_color_16p trans_color),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001208#endif
1209
John Bowler4d562962011-02-12 09:01:20 -06001210#ifdef PNG_READ_EXPAND_16_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001211PNG_INTERNAL_FUNCTION(void,png_do_expand_16,(png_row_infop row_info,
1212 png_bytep row),PNG_EMPTY);
John Bowler4d562962011-02-12 09:01:20 -06001213#endif
1214
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001215/* The following decodes the appropriate chunks, and does error correction,
1216 * then calls the appropriate callback for the chunk if it is valid.
1217 */
1218
Glenn Randers-Pehrson6c7a09a2009-06-15 21:57:39 -05001219/* Decode the IHDR chunk */
John Bowler572b0782012-01-31 07:09:34 -06001220PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr, png_inforp info_ptr,
1221 png_uint_32 length),PNG_EMPTY);
1222PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr, png_inforp info_ptr,
1223 png_uint_32 length),PNG_EMPTY);
1224PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr, png_inforp info_ptr,
1225 png_uint_32 length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001226
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001227#ifdef PNG_READ_bKGD_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001228PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr, png_inforp info_ptr,
1229 png_uint_32 length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001230#endif
1231
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001232#ifdef PNG_READ_cHRM_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001233PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr, png_inforp info_ptr,
1234 png_uint_32 length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001235#endif
1236
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001237#ifdef PNG_READ_gAMA_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001238PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr, png_inforp info_ptr,
1239 png_uint_32 length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001240#endif
1241
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001242#ifdef PNG_READ_hIST_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001243PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr, png_inforp info_ptr,
1244 png_uint_32 length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001245#endif
1246
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001247#ifdef PNG_READ_iCCP_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001248PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr, png_inforp info_ptr,
1249 png_uint_32 length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001250#endif /* PNG_READ_iCCP_SUPPORTED */
1251
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001252#ifdef PNG_READ_iTXt_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001253PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr, png_inforp info_ptr,
1254 png_uint_32 length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001255#endif
1256
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001257#ifdef PNG_READ_oFFs_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001258PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr, png_inforp info_ptr,
1259 png_uint_32 length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001260#endif
1261
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001262#ifdef PNG_READ_pCAL_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001263PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr, png_inforp info_ptr,
1264 png_uint_32 length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001265#endif
1266
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001267#ifdef PNG_READ_pHYs_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001268PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr, png_inforp info_ptr,
1269 png_uint_32 length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001270#endif
1271
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001272#ifdef PNG_READ_sBIT_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001273PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr, png_inforp info_ptr,
1274 png_uint_32 length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001275#endif
1276
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001277#ifdef PNG_READ_sCAL_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001278PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr, png_inforp info_ptr,
1279 png_uint_32 length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001280#endif
1281
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001282#ifdef PNG_READ_sPLT_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001283PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr, png_inforp info_ptr,
1284 png_uint_32 length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001285#endif /* PNG_READ_sPLT_SUPPORTED */
1286
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001287#ifdef PNG_READ_sRGB_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001288PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr, png_inforp info_ptr,
1289 png_uint_32 length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001290#endif
1291
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001292#ifdef PNG_READ_tEXt_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001293PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr, png_inforp info_ptr,
1294 png_uint_32 length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001295#endif
1296
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001297#ifdef PNG_READ_tIME_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001298PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr, png_inforp info_ptr,
1299 png_uint_32 length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001300#endif
1301
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001302#ifdef PNG_READ_tRNS_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001303PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr, png_inforp info_ptr,
1304 png_uint_32 length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001305#endif
1306
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -05001307#ifdef PNG_READ_zTXt_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001308PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr, png_inforp info_ptr,
1309 png_uint_32 length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001310#endif
1311
Glenn Randers-Pehrsonbb5cb142011-09-22 12:41:58 -05001312#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001313PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr,
1314 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
Glenn Randers-Pehrsonbb5cb142011-09-22 12:41:58 -05001315#endif
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001316
John Bowler572b0782012-01-31 07:09:34 -06001317PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_structrp png_ptr,
1318 png_uint_32 chunk_name),PNG_EMPTY);
Glenn Randers-Pehrsonbb5cb142011-09-22 12:41:58 -05001319
1320#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
1321/* Exactly as png_handle_as_unknown() except that the argument is a 32-bit chunk
1322 * name, not a string.
1323 */
John Bowler572b0782012-01-31 07:09:34 -06001324PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling,(png_structrp png_ptr,
1325 png_uint_32 chunk_name),PNG_EMPTY);
Glenn Randers-Pehrsonbb5cb142011-09-22 12:41:58 -05001326#endif
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001327
Glenn Randers-Pehrson6c7a09a2009-06-15 21:57:39 -05001328/* Handle the transformations for reading and writing */
John Bowler4a12f4a2011-04-17 18:34:22 -05001329#ifdef PNG_READ_TRANSFORMS_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001330PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr,
1331 png_row_infop row_info),PNG_EMPTY);
John Bowler4a12f4a2011-04-17 18:34:22 -05001332#endif
1333#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001334PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr,
1335 png_row_infop row_info),PNG_EMPTY);
John Bowler4a12f4a2011-04-17 18:34:22 -05001336#endif
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001337
John Bowler4a12f4a2011-04-17 18:34:22 -05001338#ifdef PNG_READ_TRANSFORMS_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001339PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr),PNG_EMPTY);
John Bowler4a12f4a2011-04-17 18:34:22 -05001340#endif
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001341
1342#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001343PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr,
1344 png_inforp info_ptr),PNG_EMPTY);
1345PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr,
1346 png_inforp info_ptr),PNG_EMPTY);
1347PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY);
1348PNG_INTERNAL_FUNCTION(void,png_push_crc_skip,(png_structrp png_ptr,
1349 png_uint_32 length),PNG_EMPTY);
1350PNG_INTERNAL_FUNCTION(void,png_push_crc_finish,(png_structrp png_ptr),PNG_EMPTY);
1351PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr),PNG_EMPTY);
1352PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr,
1353 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY);
1354PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY);
1355PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr,
1356 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY);
1357PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr),PNG_EMPTY);
1358PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr,
1359 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1360PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr,
1361 png_inforp info_ptr),PNG_EMPTY);
1362PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr,
1363 png_inforp info_ptr),PNG_EMPTY);
1364PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr, png_bytep row),PNG_EMPTY);
1365PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr,
1366 png_inforp info_ptr),PNG_EMPTY);
1367PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr,
1368 png_inforp info_ptr),PNG_EMPTY);
1369PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr),PNG_EMPTY);
Glenn Randers-Pehrsond4df36c2010-03-06 10:45:55 -06001370# ifdef PNG_READ_tEXt_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001371PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr,
1372 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1373PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr,
1374 png_inforp info_ptr),PNG_EMPTY);
Glenn Randers-Pehrsond4df36c2010-03-06 10:45:55 -06001375# endif
1376# ifdef PNG_READ_zTXt_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001377PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr,
1378 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1379PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr,
1380 png_inforp info_ptr),PNG_EMPTY);
Glenn Randers-Pehrsond4df36c2010-03-06 10:45:55 -06001381# endif
1382# ifdef PNG_READ_iTXt_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001383PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr,
1384 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1385PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr,
1386 png_inforp info_ptr),PNG_EMPTY);
Glenn Randers-Pehrsond4df36c2010-03-06 10:45:55 -06001387# endif
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001388
1389#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1390
1391#ifdef PNG_MNG_FEATURES_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001392PNG_INTERNAL_FUNCTION(void,png_do_read_intrapixel,(png_row_infop row_info,
1393 png_bytep row),PNG_EMPTY);
1394PNG_INTERNAL_FUNCTION(void,png_do_write_intrapixel,(png_row_infop row_info,
1395 png_bytep row),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001396#endif
1397
Glenn Randers-Pehrsonf7831012008-11-13 06:05:13 -06001398/* Added at libpng version 1.4.0 */
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001399#ifdef PNG_CHECK_cHRM_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001400PNG_INTERNAL_FUNCTION(int,png_check_cHRM_fixed,(png_const_structrp png_ptr,
Glenn Randers-Pehrsone8b1aa02010-03-06 11:39:29 -06001401 png_fixed_point int_white_x, png_fixed_point int_white_y,
1402 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
1403 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
John Bowler572b0782012-01-31 07:09:34 -06001404 png_fixed_point int_blue_y),PNG_EMPTY);
Glenn Randers-Pehrsonf7831012008-11-13 06:05:13 -06001405#endif
Glenn Randers-Pehrsonf7831012008-11-13 06:05:13 -06001406
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001407#ifdef PNG_CHECK_cHRM_SUPPORTED
Glenn Randers-Pehrson7ec330d2009-09-25 11:45:42 -05001408/* Added at libpng version 1.2.34 and 1.4.0 */
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001409/* Currently only used by png_check_cHRM_fixed */
John Bowler572b0782012-01-31 07:09:34 -06001410PNG_INTERNAL_FUNCTION(void,png_64bit_product,(long v1, long v2,
1411 unsigned long *hi_product, unsigned long *lo_product),PNG_EMPTY);
Glenn Randers-Pehrson7ec330d2009-09-25 11:45:42 -05001412#endif
1413
John Bowler7b979652011-08-16 22:36:43 -05001414#ifdef PNG_cHRM_SUPPORTED
John Bowler9b979b12011-08-16 22:58:33 -05001415/* Added at libpng version 1.5.5 */
1416typedef struct png_xy
1417{
1418 png_fixed_point redx, redy;
1419 png_fixed_point greenx, greeny;
1420 png_fixed_point bluex, bluey;
1421 png_fixed_point whitex, whitey;
1422} png_xy;
1423
1424typedef struct png_XYZ
1425{
1426 png_fixed_point redX, redY, redZ;
1427 png_fixed_point greenX, greenY, greenZ;
1428 png_fixed_point blueX, blueY, blueZ;
1429} png_XYZ;
1430
John Bowler736f40f2011-08-25 16:19:44 -05001431/* The conversion APIs return 0 on success, non-zero on a parameter error. They
1432 * allow conversion between the above representations of a color encoding. When
1433 * converting from XYZ end points to chromaticities the absolute magnitude of
1434 * the end points is lost, when converting back the sum of the Y values of the
1435 * three end points will be 1.0
1436 */
John Bowler572b0782012-01-31 07:09:34 -06001437PNG_INTERNAL_FUNCTION(int,png_xy_from_XYZ,(png_xy *xy, png_XYZ XYZ),PNG_EMPTY);
1438PNG_INTERNAL_FUNCTION(int,png_XYZ_from_xy,(png_XYZ *XYZ, png_xy xy),PNG_EMPTY);
1439PNG_INTERNAL_FUNCTION(int,png_XYZ_from_xy_checked,(png_const_structrp png_ptr,
1440 png_XYZ *XYZ, png_xy xy),PNG_EMPTY);
John Bowler9b979b12011-08-16 22:58:33 -05001441#endif
1442
Glenn Randers-Pehrson134bbe42009-09-24 18:10:49 -05001443/* Added at libpng version 1.4.0 */
John Bowler572b0782012-01-31 07:09:34 -06001444PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr,
Glenn Randers-Pehrsone8b1aa02010-03-06 11:39:29 -06001445 png_uint_32 width, png_uint_32 height, int bit_depth,
1446 int color_type, int interlace_type, int compression_type,
John Bowler572b0782012-01-31 07:09:34 -06001447 int filter_type),PNG_EMPTY);
Glenn Randers-Pehrson134bbe42009-09-24 18:10:49 -05001448
Glenn Randers-Pehrsoneeb1bb62012-03-02 22:10:15 -06001449/* Added at libpng version 1.5.10 */
1450#if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \
1451 defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED)
1452PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes,
1453 (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY);
1454#endif
1455
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001456#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
John Bowler572b0782012-01-31 07:09:34 -06001457PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr,
Glenn Randers-Pehrson77396b62010-08-02 08:00:10 -05001458 png_const_charp name),PNG_NORETURN);
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001459#endif
1460
John Bowler88b77cc2011-05-05 06:49:55 -05001461/* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite
1462 * the end. Always leaves the buffer nul terminated. Never errors out (and
1463 * there is no error code.)
1464 */
John Bowler572b0782012-01-31 07:09:34 -06001465PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize,
1466 size_t pos, png_const_charp string),PNG_EMPTY);
John Bowler88b77cc2011-05-05 06:49:55 -05001467
John Bowlerc5bef942011-05-05 17:35:39 -05001468/* Various internal functions to handle formatted warning messages, currently
1469 * only implemented for warnings.
1470 */
1471#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)
John Bowler88b77cc2011-05-05 06:49:55 -05001472/* Utility to dump an unsigned value into a buffer, given a start pointer and
1473 * and end pointer (which should point just *beyond* the end of the buffer!)
1474 * Returns the pointer to the start of the formatted string. This utility only
1475 * does unsigned values.
1476 */
John Bowler572b0782012-01-31 07:09:34 -06001477PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start,
1478 png_charp end, int format, png_alloc_size_t number),PNG_EMPTY);
John Bowler88b77cc2011-05-05 06:49:55 -05001479
1480/* Convenience macro that takes an array: */
1481#define PNG_FORMAT_NUMBER(buffer,format,number) \
1482 png_format_number(buffer, buffer + (sizeof buffer), format, number)
1483
1484/* Suggested size for a number buffer (enough for 64 bits and a sign!) */
1485#define PNG_NUMBER_BUFFER_SIZE 24
1486
1487/* These are the integer formats currently supported, the name is formed from
1488 * the standard printf(3) format string.
1489 */
1490#define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */
1491#define PNG_NUMBER_FORMAT_02u 2
1492#define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */
1493#define PNG_NUMBER_FORMAT_02d 2
1494#define PNG_NUMBER_FORMAT_x 3
1495#define PNG_NUMBER_FORMAT_02x 4
1496#define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */
1497#endif
1498
1499#ifdef PNG_WARNINGS_SUPPORTED
Glenn Randers-Pehrsonef217b72011-06-15 12:58:27 -05001500/* New defines and members adding in libpng-1.5.4 */
John Bowler88b77cc2011-05-05 06:49:55 -05001501# define PNG_WARNING_PARAMETER_SIZE 32
John Bowler00c6a9a2012-01-14 19:44:43 -06001502# define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */
John Bowler88b77cc2011-05-05 06:49:55 -05001503
1504/* An l-value of this type has to be passed to the APIs below to cache the
1505 * values of the parameters to a formatted warning message.
1506 */
1507typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][
1508 PNG_WARNING_PARAMETER_SIZE];
1509
John Bowler572b0782012-01-31 07:09:34 -06001510PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p,
1511 int number, png_const_charp string),PNG_EMPTY);
1512 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters,
1513 * including the trailing '\0'.
1514 */
1515PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned,
1516 (png_warning_parameters p, int number, int format, png_alloc_size_t value),
1517 PNG_EMPTY);
1518 /* Use png_alloc_size_t because it is an unsigned type as big as any we
1519 * need to output. Use the following for a signed value.
1520 */
1521PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed,
1522 (png_warning_parameters p, int number, int format, png_int_32 value),
1523 PNG_EMPTY);
John Bowler88b77cc2011-05-05 06:49:55 -05001524
John Bowler572b0782012-01-31 07:09:34 -06001525PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr,
1526 png_warning_parameters p, png_const_charp message),PNG_EMPTY);
1527 /* 'message' follows the X/Open approach of using @1, @2 to insert
1528 * parameters previously supplied using the above functions. Errors in
1529 * specifying the parameters will simple result in garbage substitutions.
1530 */
John Bowler88b77cc2011-05-05 06:49:55 -05001531#endif
1532
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001533/* ASCII to FP interfaces, currently only implemented if sCAL
1534 * support is required.
1535 */
Glenn Randers-Pehrson48dc6eb2010-07-31 07:09:58 -05001536#if defined(PNG_READ_sCAL_SUPPORTED)
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001537/* MAX_DIGITS is actually the maximum number of characters in an sCAL
1538 * width or height, derived from the precision (number of significant
Glenn Randers-Pehrson665031e2012-01-13 22:03:10 -06001539 * digits - a build time settable option) and assumptions about the
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001540 * maximum ridiculous exponent.
1541 */
1542#define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/)
Glenn Randers-Pehrson48dc6eb2010-07-31 07:09:58 -05001543
1544#ifdef PNG_FLOATING_POINT_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001545PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr,
1546 png_charp ascii, png_size_t size, double fp, unsigned int precision),
1547 PNG_EMPTY);
Glenn Randers-Pehrson48dc6eb2010-07-31 07:09:58 -05001548#endif /* FLOATING_POINT */
1549
1550#ifdef PNG_FIXED_POINT_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001551PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr,
1552 png_charp ascii, png_size_t size, png_fixed_point fp),PNG_EMPTY);
Glenn Randers-Pehrson48dc6eb2010-07-31 07:09:58 -05001553#endif /* FIXED_POINT */
1554#endif /* READ_sCAL */
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001555
1556#if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED)
1557/* An internal API to validate the format of a floating point number.
1558 * The result is the index of the next character. If the number is
1559 * not valid it will be the index of a character in the supposed number.
1560 *
1561 * The format of a number is defined in the PNG extensions specification
1562 * and this API is strictly conformant to that spec, not anyone elses!
1563 *
1564 * The format as a regular expression is:
1565 *
1566 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)?
1567 *
1568 * or:
1569 *
1570 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)?
1571 *
1572 * The complexity is that either integer or fraction must be present and the
1573 * fraction is permitted to have no digits only if the integer is present.
1574 *
1575 * NOTE: The dangling E problem.
1576 * There is a PNG valid floating point number in the following:
1577 *
1578 * PNG floating point numb1.ers are not greedy.
1579 *
1580 * Working this out requires *TWO* character lookahead (because of the
1581 * sign), the parser does not do this - it will fail at the 'r' - this
1582 * doesn't matter for PNG sCAL chunk values, but it requires more care
1583 * if the value were ever to be embedded in something more complex. Use
1584 * ANSI-C strtod if you need the lookahead.
1585 */
1586/* State table for the parser. */
1587#define PNG_FP_INTEGER 0 /* before or in integer */
1588#define PNG_FP_FRACTION 1 /* before or in fraction */
1589#define PNG_FP_EXPONENT 2 /* before or in exponent */
1590#define PNG_FP_STATE 3 /* mask for the above */
1591#define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */
1592#define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */
1593#define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */
1594#define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */
1595#define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */
John Bowler8d261262011-06-18 13:37:11 -05001596
1597/* These three values don't affect the parser. They are set but not used.
1598 */
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001599#define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */
John Bowler8d261262011-06-18 13:37:11 -05001600#define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */
1601#define PNG_FP_NONZERO 256 /* A non-zero value */
1602#define PNG_FP_STICKY 448 /* The above three flags */
1603
1604/* This is available for the caller to store in 'state' if required. Do not
1605 * call the parser after setting it (the parser sometimes clears it.)
1606 */
1607#define PNG_FP_INVALID 512 /* Available for callers as a distinct value */
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001608
1609/* Result codes for the parser (boolean - true meants ok, false means
1610 * not ok yet.)
1611 */
1612#define PNG_FP_MAYBE 0 /* The number may be valid in the future */
1613#define PNG_FP_OK 1 /* The number is valid */
1614
John Bowler8d261262011-06-18 13:37:11 -05001615/* Tests on the sticky non-zero and negative flags. To pass these checks
1616 * the state must also indicate that the whole number is valid - this is
1617 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this
1618 * is equivalent to PNG_FP_OK above.)
1619 */
1620#define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO)
1621 /* NZ_MASK: the string is valid and a non-zero negative value */
1622#define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO)
1623 /* Z MASK: the string is valid and a non-zero value. */
1624 /* PNG_FP_SAW_DIGIT: the string is valid. */
1625#define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT)
1626#define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK)
1627#define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK)
John Bowler6f237b62012-03-02 13:13:15 -06001628
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001629/* The actual parser. This can be called repeatedly, it updates
1630 * the index into the string and the state variable (which must
1631 * be initialzed to 0). It returns a result code, as above. There
1632 * is no point calling the parser any more if it fails to advance to
1633 * the end of the string - it is stuck on an invalid character (or
1634 * terminated by '\0').
1635 *
1636 * Note that the pointer will consume an E or even an E+ then leave
1637 * a 'maybe' state even though a preceding integer.fraction is valid.
1638 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was
1639 * a valid number. It's possible to recover from this by calling
1640 * the parser again (from the start, with state 0) but with a string
1641 * that omits the last character (i.e. set the size to the index of
1642 * the problem character.) This has not been tested within libpng.
1643 */
John Bowler572b0782012-01-31 07:09:34 -06001644PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string,
1645 png_size_t size, int *statep, png_size_tp whereami),PNG_EMPTY);
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001646
1647/* This is the same but it checks a complete string and returns true
John Bowler8d261262011-06-18 13:37:11 -05001648 * only if it just contains a floating point number. As of 1.5.4 this
1649 * function also returns the state at the end of parsing the number if
1650 * it was valid (otherwise it returns 0.) This can be used for testing
1651 * for negative or zero values using the sticky flag.
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001652 */
John Bowler572b0782012-01-31 07:09:34 -06001653PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string,
1654 png_size_t size),PNG_EMPTY);
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001655#endif /* pCAL || sCAL */
1656
Glenn Randers-Pehrson48dc6eb2010-07-31 07:09:58 -05001657#if defined(PNG_READ_GAMMA_SUPPORTED) ||\
1658 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED)
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001659/* Added at libpng version 1.5.0 */
1660/* This is a utility to provide a*times/div (rounded) and indicate
1661 * if there is an overflow. The result is a boolean - false (0)
1662 * for overflow, true (1) if no overflow, in which case *res
1663 * holds the result.
1664 */
John Bowler572b0782012-01-31 07:09:34 -06001665PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a,
1666 png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY);
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001667#endif
1668
1669#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED)
1670/* Same deal, but issue a warning on overflow and return 0. */
John Bowler572b0782012-01-31 07:09:34 -06001671PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn,
1672 (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by,
1673 png_int_32 divided_by),PNG_EMPTY);
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001674#endif
1675
1676#ifdef PNG_READ_GAMMA_SUPPORTED
1677/* Calculate a reciprocal - used for gamma values. This returns
1678 * 0 if the argument is 0 in order to maintain an undefined value,
1679 * there are no warnings.
1680 */
John Bowler572b0782012-01-31 07:09:34 -06001681PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a),
1682 PNG_EMPTY);
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001683
1684/* The same but gives a reciprocal of the product of two fixed point
1685 * values. Accuracy is suitable for gamma calculations but this is
1686 * not exact - use png_muldiv for that.
1687 */
John Bowler572b0782012-01-31 07:09:34 -06001688PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a,
1689 png_fixed_point b),PNG_EMPTY);
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001690#endif
1691
1692#ifdef PNG_READ_GAMMA_SUPPORTED
1693/* Internal fixed point gamma correction. These APIs are called as
1694 * required to convert single values - they don't need to be fast,
1695 * they are not used when processing image pixel values.
1696 *
1697 * While the input is an 'unsigned' value it must actually be the
1698 * correct bit value - 0..255 or 0..65535 as required.
1699 */
John Bowler572b0782012-01-31 07:09:34 -06001700PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr,
1701 unsigned int value, png_fixed_point gamma_value),PNG_EMPTY);
1702PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value),
1703 PNG_EMPTY);
1704PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value,
1705 png_fixed_point gamma_value),PNG_EMPTY);
1706PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value,
1707 png_fixed_point gamma_value),PNG_EMPTY);
1708PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr),
1709 PNG_EMPTY);
1710PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr,
1711 int bit_depth),PNG_EMPTY);
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001712#endif
Glenn Randers-Pehrsond29033f2009-11-07 10:46:42 -06001713
John Bowler7875d532011-11-07 22:33:49 -06001714/* SIMPLIFIED READ/WRITE SUPPORT */
1715#if defined PNG_SIMPLIFIED_READ_SUPPORTED ||\
1716 defined PNG_SIMPLIFIED_WRITE_SUPPORTED
1717/* The internal structure that png_image::opaque points to. */
1718typedef struct png_control
1719{
John Bowler5bc90382012-01-23 22:43:22 -06001720 png_structp png_ptr;
1721 png_infop info_ptr;
1722 png_voidp error_buf; /* Always a jmp_buf at present. */
John Bowler7875d532011-11-07 22:33:49 -06001723
John Bowler5bc90382012-01-23 22:43:22 -06001724 png_const_bytep memory; /* Memory buffer. */
1725 png_size_t size; /* Size of the memory buffer. */
John Bowler7875d532011-11-07 22:33:49 -06001726
John Bowler5bc90382012-01-23 22:43:22 -06001727 unsigned int for_write :1; /* Otherwise it is a read structure */
1728 unsigned int owned_file :1; /* We own the file in io_ptr */
John Bowler7875d532011-11-07 22:33:49 -06001729} png_control;
1730
John Bowler4fa96a42011-11-16 16:39:16 -06001731/* Return the pointer to the jmp_buf from a png_control: necessary because C
1732 * does not reveal the type of the elements of jmp_buf.
1733 */
1734#ifdef __cplusplus
1735# define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0])
1736#else
1737# define png_control_jmp_buf(pc) ((pc)->error_buf)
1738#endif
1739
John Bowler7875d532011-11-07 22:33:49 -06001740/* Utility to safely execute a piece of libpng code catching and logging any
1741 * errors that might occur. Returns true on success, false on failure (either
1742 * of the function or as a result of a png_error.)
1743 */
John Bowler572b0782012-01-31 07:09:34 -06001744PNG_INTERNAL_FUNCTION(void,png_safe_error,(png_structp png_ptr,
1745 png_const_charp error_message),PNG_NORETURN);
John Bowler7875d532011-11-07 22:33:49 -06001746
1747#ifdef PNG_WARNINGS_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001748PNG_INTERNAL_FUNCTION(void,png_safe_warning,(png_structp png_ptr,
1749 png_const_charp warning_message),PNG_EMPTY);
John Bowler7875d532011-11-07 22:33:49 -06001750#else
1751# define png_safe_warning 0/*dummy argument*/
1752#endif
1753
John Bowler572b0782012-01-31 07:09:34 -06001754PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image,
1755 int (*function)(png_voidp), png_voidp arg),PNG_EMPTY);
John Bowler7875d532011-11-07 22:33:49 -06001756
1757/* Utility to log an error, this also cleans up the png_image, the function
1758 * always returns 0 (false).
1759 */
John Bowler572b0782012-01-31 07:09:34 -06001760PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image,
1761 png_const_charp error_message),PNG_EMPTY);
John Bowler7875d532011-11-07 22:33:49 -06001762
1763#endif /* SIMPLIFIED READ/WRITE */
1764
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001765/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
1766
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001767#include "pngdebug.h"
1768
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001769#ifdef __cplusplus
1770}
1771#endif
1772
Glenn Randers-Pehrsonbeb572e2006-08-19 13:59:24 -05001773#endif /* PNGPRIV_H */