blob: e09a10e4d9df656a27fb99dd363e03aa3b9db0e6 [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"
Glenn Randers-Pehrsonc3cd22b2010-03-08 21:10:25 -0600189#include "pngstruct.h"
John Bowlerb11b31a2012-03-21 07:55:46 -0500190#include "pnginfo.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 Bowlerb4541692012-04-30 06:31:54 -0500315# define png_aligncast(type, value) \
316 static_cast<type>(static_cast<void*>(value))
317# define png_aligncastconst(type, value) \
318 static_cast<type>(static_cast<const void*>(value))
John Bowler4fa96a42011-11-16 16:39:16 -0600319#else
320# define png_voidcast(type, value) (value)
John Bowler40b26032011-12-22 08:09:15 -0600321# define png_constcast(type, value) ((type)(value))
John Bowlerb4541692012-04-30 06:31:54 -0500322# define png_aligncast(type, value) ((void*)(value))
323# define png_aligncastconst(type, value) ((const void*)(value))
John Bowler4fa96a42011-11-16 16:39:16 -0600324#endif /* __cplusplus */
325
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500326/* Some fixed point APIs are still required even if not exported because
327 * they get used by the corresponding floating point APIs. This magic
328 * deals with this:
329 */
330#ifdef PNG_FIXED_POINT_SUPPORTED
331# define PNGFAPI PNGAPI
332#else
333# define PNGFAPI /* PRIVATE */
334#endif
335
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500336/* Other defines specific to compilers can go here. Try to keep
337 * them inside an appropriate ifdef/endif pair for portability.
338 */
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500339#if defined(PNG_FLOATING_POINT_SUPPORTED) ||\
340 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
Glenn Randers-Pehrson233357e2010-07-29 21:49:38 -0500341 /* png.c requires the following ANSI-C constants if the conversion of
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500342 * floating point to ASCII is implemented therein:
Glenn Randers-Pehrsonc36bb792011-02-12 09:49:07 -0600343 *
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500344 * DBL_DIG Maximum number of decimal digits (can be set to any constant)
Glenn Randers-Pehrson233357e2010-07-29 21:49:38 -0500345 * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value)
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500346 * DBL_MAX Maximum floating point number (can be set to an arbitrary value)
347 */
348# include <float.h>
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500349
Glenn Randers-Pehrsond00bbb22010-03-14 09:15:49 -0500350# if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
351 defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500352 /* We need to check that <math.h> hasn't already been included earlier
353 * as it seems it doesn't agree with <fp.h>, yet we should really use
354 * <fp.h> if possible.
355 */
356# if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
357# include <fp.h>
358# endif
359# else
360# include <math.h>
361# endif
362# if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
363 /* Amiga SAS/C: We must include builtin FPU functions when compiling using
364 * MATH=68881
365 */
366# include <m68881.h>
367# endif
368#endif
369
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500370/* This provides the non-ANSI (far) memory allocation routines. */
371#if defined(__TURBOC__) && defined(__MSDOS__)
372# include <mem.h>
373# include <alloc.h>
374#endif
375
376#if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \
Glenn Randers-Pehrsonf74c5ac2009-09-20 07:27:34 -0500377 defined(_WIN32) || defined(__WIN32__)
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500378# include <windows.h> /* defines _WINDOWS_ macro */
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500379#endif
380
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500381/* Moved here around 1.5.0beta36 from pngconf.h */
382/* Users may want to use these so they are not private. Any library
383 * functions that are passed far data must be model-independent.
Glenn Randers-Pehrson862cb202010-04-16 22:12:51 -0500384 */
385
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500386/* Memory model/platform independent fns */
387#ifndef PNG_ABORT
388# ifdef _WINDOWS_
389# define PNG_ABORT() ExitProcess(0)
390# else
391# define PNG_ABORT() abort()
392# endif
Glenn Randers-Pehrson862cb202010-04-16 22:12:51 -0500393#endif
394
John Bowlerbaeb6d12011-11-26 18:21:02 -0600395/* Prior to 1.6.0 if _WINDOWS_ was defined 'lstrlenA' and 'CopyMemory' were used
Glenn Randers-Pehrson4c7e8202011-11-26 19:00:01 -0600396 * in place of the ISOC90 functions; this is no longer done in 1.6.0, however
John Bowlerbaeb6d12011-11-26 18:21:02 -0600397 * the use of png_foo as a macro defined to the C function is retained.
398 */
399#define png_strlen strlen
400#define png_memcmp memcmp
401#define png_memcpy memcpy
402#define png_memset memset
Glenn Randers-Pehrson65c03392011-10-06 21:54:17 -0500403
John Bowler4e68aa72011-10-11 16:01:33 -0500404/* These macros may need to be architecture dependent. */
405#define PNG_ALIGN_NONE 0 /* do not use data alignment */
406#define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */
Glenn Randers-Pehrson65c03392011-10-06 21:54:17 -0500407#ifdef offsetof
John Bowler4e68aa72011-10-11 16:01:33 -0500408# define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */
409#else
410# define PNG_ALIGN_OFFSET -1 /* prevent the use of this */
411#endif
412#define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */
413
414#ifndef PNG_ALIGN_TYPE
415 /* Default to using aligned access optimizations and requiring alignment to a
416 * multiple of the data type size. Override in a compiler specific fashion
417 * if necessary by inserting tests here:
418 */
419# define PNG_ALIGN_TYPE PNG_ALIGN_SIZE
420#endif
421
422#if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE
423 /* This is used because in some compiler implementations non-aligned
424 * structure members are supported, so the offsetof approach below fails.
425 * Set PNG_ALIGN_TO_SIZE=0 for compiler combinations where unaligned access
426 * is good for performance. Do not do this unless you have tested the result
427 * and understand it.
428 */
429# define png_alignof(type) (sizeof (type))
430#else
431# if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET
432# define png_alignof(type) offsetof(struct{char c; type t;}, t)
433# else
434# if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS
435# define png_alignof(type) (1)
436# endif
437 /* Else leave png_alignof undefined to prevent use thereof */
438# endif
Glenn Randers-Pehrson65c03392011-10-06 21:54:17 -0500439#endif
440
441/* This implicitly assumes alignment is always to a power of 2. */
442#ifdef png_alignof
443# define png_isaligned(ptr, type)\
John Bowler4e68aa72011-10-11 16:01:33 -0500444 ((((const char*)ptr-(const char*)0) & (png_alignof(type)-1)) == 0)
Glenn Randers-Pehrson65c03392011-10-06 21:54:17 -0500445#else
446# define png_isaligned(ptr, type) 0
447#endif
448
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500449/* End of memory model/platform independent support */
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500450/* End of 1.5.0beta36 move from pngconf.h */
451
452/* CONSTANTS and UTILITY MACROS
453 * These are used internally by libpng and not exposed in the API
Glenn Randers-Pehrson862cb202010-04-16 22:12:51 -0500454 */
Glenn Randers-Pehrson9f044c12010-12-07 14:59:43 -0600455
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500456/* Various modes of operation. Note that after an init, mode is set to
Glenn Randers-Pehrson2d3fc1c2011-05-10 23:48:00 -0500457 * zero automatically when the structure is created. Three of these
458 * are defined in png.h because they need to be visible to applications
459 * that call png_set_unknown_chunk().
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500460 */
Glenn Randers-Pehrson2d3fc1c2011-05-10 23:48:00 -0500461/* #define PNG_HAVE_IHDR 0x01 (defined in png.h) */
462/* #define PNG_HAVE_PLTE 0x02 (defined in png.h) */
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500463#define PNG_HAVE_IDAT 0x04
Glenn Randers-Pehrson2d3fc1c2011-05-10 23:48:00 -0500464/* #define PNG_AFTER_IDAT 0x08 (defined in png.h) */
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500465#define PNG_HAVE_IEND 0x10
John Bowlerb11b31a2012-03-21 07:55:46 -0500466 /* 0x20 (unused) */
467 /* 0x40 (unused) */
468 /* 0x80 (unused) */
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500469#define PNG_HAVE_CHUNK_HEADER 0x100
470#define PNG_WROTE_tIME 0x200
471#define PNG_WROTE_INFO_BEFORE_PLTE 0x400
472#define PNG_BACKGROUND_IS_GRAY 0x800
473#define PNG_HAVE_PNG_SIGNATURE 0x1000
Glenn Randers-Pehrson6bc53be2006-06-16 07:52:03 -0500474#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
John Bowlerb11b31a2012-03-21 07:55:46 -0500475 /* 0x4000 (unused) */
John Bowlerb5d00512012-03-09 09:15:18 -0600476#define PNG_IS_READ_STRUCT 0x8000 /* Else is a write struct */
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500477
Glenn Randers-Pehrson6c7a09a2009-06-15 21:57:39 -0500478/* Flags for the transformations the PNG library does on the image data */
Glenn Randers-Pehrson1916f6a2008-08-14 13:44:49 -0500479#define PNG_BGR 0x0001
480#define PNG_INTERLACE 0x0002
481#define PNG_PACK 0x0004
482#define PNG_SHIFT 0x0008
483#define PNG_SWAP_BYTES 0x0010
484#define PNG_INVERT_MONO 0x0020
Glenn Randers-Pehrson3cd7cff2010-04-16 19:27:08 -0500485#define PNG_QUANTIZE 0x0040
John Bowlerd273ad22011-05-07 21:00:28 -0500486#define PNG_COMPOSE 0x0080 /* Was PNG_BACKGROUND */
Glenn Randers-Pehrson1916f6a2008-08-14 13:44:49 -0500487#define PNG_BACKGROUND_EXPAND 0x0100
John Bowler4d562962011-02-12 09:01:20 -0600488#define PNG_EXPAND_16 0x0200 /* Added to libpng 1.5.2 */
John Bowler8d261262011-06-18 13:37:11 -0500489#define PNG_16_TO_8 0x0400 /* Becomes 'chop' in 1.5.4 */
Glenn Randers-Pehrson1916f6a2008-08-14 13:44:49 -0500490#define PNG_RGBA 0x0800
491#define PNG_EXPAND 0x1000
492#define PNG_GAMMA 0x2000
493#define PNG_GRAY_TO_RGB 0x4000
Glenn Randers-Pehrsond3261112011-09-15 08:12:08 -0500494#define PNG_FILLER 0x8000
495#define PNG_PACKSWAP 0x10000
496#define PNG_SWAP_ALPHA 0x20000
497#define PNG_STRIP_ALPHA 0x40000
498#define PNG_INVERT_ALPHA 0x80000
499#define PNG_USER_TRANSFORM 0x100000
500#define PNG_RGB_TO_GRAY_ERR 0x200000
501#define PNG_RGB_TO_GRAY_WARN 0x400000
502#define PNG_RGB_TO_GRAY 0x600000 /* two bits, RGB_TO_GRAY_ERR|WARN */
503#define PNG_ENCODE_ALPHA 0x800000 /* Added to libpng-1.5.4 */
504#define PNG_ADD_ALPHA 0x1000000 /* Added to libpng-1.2.7 */
505#define PNG_EXPAND_tRNS 0x2000000 /* Added to libpng-1.2.9 */
506#define PNG_SCALE_16_TO_8 0x4000000 /* Added to libpng-1.5.4 */
507 /* 0x8000000 unused */
508 /* 0x10000000 unused */
509 /* 0x20000000 unused */
510 /* 0x40000000 unused */
Glenn Randers-Pehrson6c7a09a2009-06-15 21:57:39 -0500511/* Flags for png_create_struct */
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500512#define PNG_STRUCT_PNG 0x0001
513#define PNG_STRUCT_INFO 0x0002
514
515/* Scaling factor for filter heuristic weighting calculations */
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500516#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500517#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
518
Glenn Randers-Pehrson6c7a09a2009-06-15 21:57:39 -0500519/* Flags for the png_ptr->flags rather than declaring a byte for each one */
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500520#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
John Bowler42a2b552012-03-05 20:57:40 -0600521#define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002 /* Added to libpng-1.6.0 */
John Bowlerb5d00512012-03-09 09:15:18 -0600522 /* 0x0004 unused */
John Bowler42a2b552012-03-05 20:57:40 -0600523#define PNG_FLAG_ZSTREAM_ENDED 0x0008 /* Added to libpng-1.6.0 */
John Bowlerb5d00512012-03-09 09:15:18 -0600524 /* 0x0010 unused */
John Bowler42a2b552012-03-05 20:57:40 -0600525 /* 0x0020 unused */
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500526#define PNG_FLAG_ROW_INIT 0x0040
527#define PNG_FLAG_FILLER_AFTER 0x0080
528#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
529#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
530#define PNG_FLAG_CRC_CRITICAL_USE 0x0400
531#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
John Bowler42a2b552012-03-05 20:57:40 -0600532#define PNG_FLAG_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.4 */
533#define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.4 */
534#define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.4 */
John Bowlerf3f7e142011-09-09 07:32:37 -0500535#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000
John Bowler42a2b552012-03-05 20:57:40 -0600536#define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000
537#define PNG_FLAG_LIBRARY_MISMATCH 0x20000
538#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000
539#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000
540#define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000 /* Added to libpng-1.4.0 */
John Bowler2bc76ff2012-03-18 22:37:25 -0500541#define PNG_FLAG_APP_WARNINGS_WARN 0x200000 /* Added to libpng-1.6.0 */
542#define PNG_FLAG_APP_ERRORS_WARN 0x400000 /* Added to libpng-1.6.0 */
John Bowler42a2b552012-03-05 20:57:40 -0600543 /* 0x800000 unused */
544 /* 0x1000000 unused */
545 /* 0x2000000 unused */
546 /* 0x4000000 unused */
547 /* 0x8000000 unused */
548 /* 0x10000000 unused */
549 /* 0x20000000 unused */
550 /* 0x40000000 unused */
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500551
552#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
553 PNG_FLAG_CRC_ANCILLARY_NOWARN)
554
555#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
556 PNG_FLAG_CRC_CRITICAL_IGNORE)
557
558#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
559 PNG_FLAG_CRC_CRITICAL_MASK)
560
Glenn Randers-Pehrson6c7a09a2009-06-15 21:57:39 -0500561/* Save typing and make code easier to understand */
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500562
563#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
564 abs((int)((c1).green) - (int)((c2).green)) + \
565 abs((int)((c1).blue) - (int)((c2).blue)))
566
Glenn Randers-Pehrsonefc4b692011-11-07 23:31:34 -0600567/* Added to libpng-1.5.7: sRGB conversion tables */
Glenn Randers-Pehrson85964682011-11-16 08:52:36 -0600568#if defined PNG_SIMPLIFIED_READ_SUPPORTED ||\
569 defined PNG_SIMPLIFIED_WRITE_SUPPORTED
John Bowler7875d532011-11-07 22:33:49 -0600570#ifdef PNG_SIMPLIFIED_READ_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -0600571PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]);
John Bowler7875d532011-11-07 22:33:49 -0600572 /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value,
John Bowler5bc90382012-01-23 22:43:22 -0600573 * 0..65535. This table gives the closest 16-bit answers (no errors).
John Bowler7875d532011-11-07 22:33:49 -0600574 */
575#endif
576
John Bowler572b0782012-01-31 07:09:34 -0600577PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]);
578PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]);
John Bowler7875d532011-11-07 22:33:49 -0600579
John Bowler5bc90382012-01-23 22:43:22 -0600580#define PNG_sRGB_FROM_LINEAR(linear) ((png_byte)((png_sRGB_base[(linear)>>15] +\
581 ((((linear)&0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8))
John Bowler7875d532011-11-07 22:33:49 -0600582 /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB
583 * encoded value with maximum error 0.646365. Note that the input is not a
584 * 16-bit value; it has been multiplied by 255! */
Glenn Randers-Pehrson85964682011-11-16 08:52:36 -0600585#endif /* PNG_SIMPLIFIED_READ/WRITE */
John Bowler7875d532011-11-07 22:33:49 -0600586
John Bowler5bc90382012-01-23 22:43:22 -0600587/* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255
588 * by dividing by 257 *with rounding*. This macro is exact for the given range.
589 * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the
590 * macro were established by experiment (modifying the added value). The macro
591 * has a second variant that takes a value already scaled by 255 and divides by
592 * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it
593 * only gives off-by-one errors and only for 0.5% (1 in 200) of the values.
594 */
595#define PNG_DIV65535(v24) (((v24) + 32895) >> 16)
596#define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255)
597
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500598/* Added to libpng-1.2.6 JB */
599#define PNG_ROWBYTES(pixel_bits, width) \
600 ((pixel_bits) >= 8 ? \
Glenn Randers-Pehrsonbeb572e2006-08-19 13:59:24 -0500601 ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \
602 (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) )
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500603
604/* PNG_OUT_OF_RANGE returns true if value is outside the range
Glenn Randers-Pehrson9bf60832009-09-20 13:37:50 -0500605 * ideal-delta..ideal+delta. Each argument is evaluated twice.
606 * "ideal" and "delta" should be constants, normally simple
607 * integers, "value" a variable. Added to libpng-1.2.6 JB
608 */
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500609#define PNG_OUT_OF_RANGE(value, ideal, delta) \
Glenn Randers-Pehrsone8b1aa02010-03-06 11:39:29 -0600610 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500611
Glenn Randers-Pehrson363f96e2010-08-11 09:00:26 -0500612/* Conversions between fixed and floating point, only defined if
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500613 * required (to make sure the code doesn't accidentally use float
614 * when it is supposedly disabled.)
615 */
616#ifdef PNG_FLOATING_POINT_SUPPORTED
Glenn Randers-Pehrson233357e2010-07-29 21:49:38 -0500617/* The floating point conversion can't overflow, though it can and
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500618 * does lose accuracy relative to the original fixed point value.
619 * In practice this doesn't matter because png_fixed_point only
620 * stores numbers with very low precision. The png_ptr and s
621 * arguments are unused by default but are there in case error
622 * checking becomes a requirement.
623 */
624#define png_float(png_ptr, fixed, s) (.00001 * (fixed))
625
Glenn Randers-Pehrson233357e2010-07-29 21:49:38 -0500626/* The fixed point conversion performs range checking and evaluates
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500627 * its argument multiple times, so must be used with care. The
628 * range checking uses the PNG specification values for a signed
629 * 32 bit fixed point value except that the values are deliberately
Glenn Randers-Pehrson9f044c12010-12-07 14:59:43 -0600630 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly
631 * (2^31-1) * 100000). 's' is a string that describes the value being
632 * converted.
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500633 *
634 * NOTE: this macro will raise a png_error if the range check fails,
635 * therefore it is normally only appropriate to use this on values
636 * that come from API calls or other sources where an out of range
637 * error indicates a programming error, not a data error!
638 *
639 * NOTE: by default this is off - the macro is not used - because the
640 * function call saves a lot of code.
641 */
642#ifdef PNG_FIXED_POINT_MACRO_SUPPORTED
643#define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\
Glenn Randers-Pehrson48dc6eb2010-07-31 07:09:58 -0500644 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0))
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500645#endif
John Bowlerbce79882012-02-13 11:45:22 -0600646/* else the corresponding function is defined below, inside the scope of the
John Bowler572b0782012-01-31 07:09:34 -0600647 * cplusplus test.
648 */
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500649#endif
650
Glenn Randers-Pehrsonbb5cb142011-09-22 12:41:58 -0500651/* Constants for known chunk types. If you need to add a chunk, define the name
652 * here. For historical reasons these constants have the form png_<name>; i.e.
653 * the prefix is lower case. Please use decimal values as the parameters to
654 * match the ISO PNG specification and to avoid relying on the C locale
655 * interpretation of character values.
656 *
657 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values
658 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string
659 * to be generated if required.
660 *
661 * PNG_32b correctly produces a value shifted by up to 24 bits, even on
662 * architectures where (int) is only 16 bits.
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500663 */
Glenn Randers-Pehrsonbb5cb142011-09-22 12:41:58 -0500664#define PNG_32b(b,s) ((png_uint_32)(b) << (s))
665#define PNG_CHUNK(b1,b2,b3,b4) \
666 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0))
667
668#define png_IHDR PNG_CHUNK( 73, 72, 68, 82)
669#define png_IDAT PNG_CHUNK( 73, 68, 65, 84)
670#define png_IEND PNG_CHUNK( 73, 69, 78, 68)
671#define png_PLTE PNG_CHUNK( 80, 76, 84, 69)
672#define png_bKGD PNG_CHUNK( 98, 75, 71, 68)
673#define png_cHRM PNG_CHUNK( 99, 72, 82, 77)
674#define png_gAMA PNG_CHUNK(103, 65, 77, 65)
675#define png_hIST PNG_CHUNK(104, 73, 83, 84)
676#define png_iCCP PNG_CHUNK(105, 67, 67, 80)
677#define png_iTXt PNG_CHUNK(105, 84, 88, 116)
678#define png_oFFs PNG_CHUNK(111, 70, 70, 115)
679#define png_pCAL PNG_CHUNK(112, 67, 65, 76)
680#define png_sCAL PNG_CHUNK(115, 67, 65, 76)
681#define png_pHYs PNG_CHUNK(112, 72, 89, 115)
682#define png_sBIT PNG_CHUNK(115, 66, 73, 84)
683#define png_sPLT PNG_CHUNK(115, 80, 76, 84)
684#define png_sRGB PNG_CHUNK(115, 82, 71, 66)
685#define png_sTER PNG_CHUNK(115, 84, 69, 82)
686#define png_tEXt PNG_CHUNK(116, 69, 88, 116)
687#define png_tIME PNG_CHUNK(116, 73, 77, 69)
688#define png_tRNS PNG_CHUNK(116, 82, 78, 83)
689#define png_zTXt PNG_CHUNK(122, 84, 88, 116)
690
691/* The following will work on (signed char*) strings, whereas the get_uint_32
692 * macro will fail on top-bit-set values because of the sign extension.
693 */
694#define PNG_CHUNK_FROM_STRING(s)\
695 PNG_CHUNK(0xff&(s)[0], 0xff&(s)[1], 0xff&(s)[2], 0xff&(s)[3])
696
697/* This uses (char), not (png_byte) to avoid warnings on systems where (char) is
698 * signed and the argument is a (char[]) This macro will fail miserably on
699 * systems where (char) is more than 8 bits.
700 */
701#define PNG_STRING_FROM_CHUNK(s,c)\
702 (void)(((char*)(s))[0]=(char)((c)>>24), ((char*)(s))[1]=(char)((c)>>16),\
Glenn Randers-Pehrsond02d6a12011-09-26 16:43:08 -0500703 ((char*)(s))[2]=(char)((c)>>8), ((char*)(s))[3]=(char)((c)))
Glenn Randers-Pehrsonbb5cb142011-09-22 12:41:58 -0500704
705/* Do the same but terminate with a null character. */
706#define PNG_CSTRING_FROM_CHUNK(s,c)\
707 (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0)
708
709/* Test on flag values as defined in the spec (section 5.4): */
710#define PNG_CHUNK_ANCILLIARY(c) (1 & ((c) >> 29))
711#define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLIARY(c))
712#define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21))
713#define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13))
714#define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5))
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500715
Glenn Randers-Pehrsonef217b72011-06-15 12:58:27 -0500716/* Gamma values (new at libpng-1.5.4): */
John Bowlerf70c7d02011-05-10 22:54:37 -0500717#define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */
718#define PNG_GAMMA_MAC_INVERSE 65909
719#define PNG_GAMMA_sRGB_INVERSE 45455
720
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500721
722/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
723#ifdef __cplusplus
724extern "C" {
725#endif /* __cplusplus */
726
John Bowlerd332c672011-12-21 17:36:12 -0600727/* Internal functions; these are not exported from a DLL however because they
728 * are used within several of the C source files they have to be C extern.
John Bowler572b0782012-01-31 07:09:34 -0600729 *
730 * All of these functions must be declared with PNG_INTERNAL_FUNCTION.
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500731 */
732
John Bowler42a2b552012-03-05 20:57:40 -0600733/* Zlib support */
John Bowlerb5d00512012-03-09 09:15:18 -0600734#define PNG_UNEXPECTED_ZLIB_RETURN (-7)
735PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret),
736 PNG_EMPTY);
737 /* Used by the zlib handling functions to ensure that z_stream::msg is always
738 * set before they return.
739 */
740
741#ifdef PNG_WRITE_SUPPORTED
742PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr,
743 png_compression_bufferp *list),PNG_EMPTY);
744 /* Free the buffer list used by the compressed write code. */
745#endif
John Bowler42a2b552012-03-05 20:57:40 -0600746
John Bowler572b0782012-01-31 07:09:34 -0600747#if defined PNG_FLOATING_POINT_SUPPORTED &&\
748 !defined PNG_FIXED_POINT_MACRO_SUPPORTED
749PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr,
750 double fp, png_const_charp text),PNG_EMPTY);
751#endif
752
John Bowler88b77cc2011-05-05 06:49:55 -0500753/* Check the user version string for compatibility, returns false if the version
754 * numbers aren't compatible.
755 */
John Bowler572b0782012-01-31 07:09:34 -0600756PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr,
757 png_const_charp user_png_ver),PNG_EMPTY);
John Bowler88b77cc2011-05-05 06:49:55 -0500758
John Bowlerd332c672011-12-21 17:36:12 -0600759/* Internal base allocator - no messages, NULL on failure to allocate. This
760 * does, however, call the application provided allocator and that could call
761 * png_error (although that would be a bug in the application implementation.)
762 */
John Bowler572b0782012-01-31 07:09:34 -0600763PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr,
764 png_alloc_size_t size),PNG_ALLOCATED);
John Bowlerd332c672011-12-21 17:36:12 -0600765
766/* Magic to create a struct when there is no struct to call the user supplied
767 * memory allocators. Because error handling has not been set up the memory
768 * handlers can't safely call png_error, but this is an obscure and undocumented
769 * restriction so libpng has to assume that the 'free' handler, at least, might
770 * call png_error.
771 */
John Bowler572b0782012-01-31 07:09:34 -0600772PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct,
773 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
774 png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn,
775 png_free_ptr free_fn),PNG_ALLOCATED);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500776
777/* Free memory from internal libpng struct */
John Bowler572b0782012-01-31 07:09:34 -0600778PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr),
779 PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500780
John Bowlerd332c672011-12-21 17:36:12 -0600781/* Free an allocated jmp_buf (always succeeds) */
John Bowler572b0782012-01-31 07:09:34 -0600782PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY);
John Bowlerd332c672011-12-21 17:36:12 -0600783
Glenn Randers-Pehrsonbeb572e2006-08-19 13:59:24 -0500784/* Function to allocate memory for zlib. PNGAPI is disallowed. */
John Bowler572b0782012-01-31 07:09:34 -0600785PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size),
786 PNG_ALLOCATED);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500787
Glenn Randers-Pehrsonbeb572e2006-08-19 13:59:24 -0500788/* Function to free memory for zlib. PNGAPI is disallowed. */
John Bowler572b0782012-01-31 07:09:34 -0600789PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500790
Glenn Randers-Pehrsoneae8e362010-03-12 17:36:53 -0600791/* Next four functions are used internally as callbacks. PNGCBAPI is required
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -0500792 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to
793 * PNGCBAPI at 1.5.0
Glenn Randers-Pehrsoneae8e362010-03-12 17:36:53 -0600794 */
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500795
John Bowler572b0782012-01-31 07:09:34 -0600796PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr,
797 png_bytep data, png_size_t length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500798
799#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -0600800PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr,
801 png_bytep buffer, png_size_t length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500802#endif
803
John Bowler572b0782012-01-31 07:09:34 -0600804PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr,
805 png_bytep data, png_size_t length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500806
Glenn Randers-Pehrsondbd40142009-08-31 08:42:02 -0500807#ifdef PNG_WRITE_FLUSH_SUPPORTED
Glenn Randers-Pehrsond4df36c2010-03-06 10:45:55 -0600808# ifdef PNG_STDIO_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -0600809PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr),
810 PNG_EMPTY);
Glenn Randers-Pehrsond4df36c2010-03-06 10:45:55 -0600811# endif
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500812#endif
813
814/* Reset the CRC variable */
John Bowler572b0782012-01-31 07:09:34 -0600815PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500816
Glenn Randers-Pehrsonbeb572e2006-08-19 13:59:24 -0500817/* Write the "data" buffer to whatever output you are using */
John Bowler572b0782012-01-31 07:09:34 -0600818PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr,
819 png_const_bytep data, png_size_t length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500820
Glenn Randers-Pehrsona5815562010-11-20 21:48:29 -0600821/* Read and check the PNG file signature */
John Bowler572b0782012-01-31 07:09:34 -0600822PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr,
823 png_inforp info_ptr),PNG_EMPTY);
Glenn Randers-Pehrsona5815562010-11-20 21:48:29 -0600824
Glenn Randers-Pehrsonbeb572e2006-08-19 13:59:24 -0500825/* Read the chunk header (length + type name) */
John Bowler572b0782012-01-31 07:09:34 -0600826PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr),
827 PNG_EMPTY);
Glenn Randers-Pehrsonbeb572e2006-08-19 13:59:24 -0500828
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500829/* Read data from whatever input you are using into the "data" buffer */
John Bowler572b0782012-01-31 07:09:34 -0600830PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data,
831 png_size_t length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500832
833/* Read bytes into buf, and update png_ptr->crc */
John Bowler572b0782012-01-31 07:09:34 -0600834PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf,
John Bowler0ae4f7b2012-03-03 21:10:26 -0600835 png_uint_32 length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500836
837/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
John Bowler572b0782012-01-31 07:09:34 -0600838PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr,
839 png_uint_32 skip),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500840
841/* Read the CRC from the file and compare it to the libpng calculated CRC */
John Bowler572b0782012-01-31 07:09:34 -0600842PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500843
844/* Calculate the CRC over a section of data. Note that we are only
845 * passing a maximum of 64K on systems that have this as a memory limit,
846 * since this is the maximum buffer size we can specify.
847 */
John Bowler572b0782012-01-31 07:09:34 -0600848PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr,
849 png_const_bytep ptr, png_size_t length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500850
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -0500851#ifdef PNG_WRITE_FLUSH_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -0600852PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500853#endif
854
Glenn Randers-Pehrson6c7a09a2009-06-15 21:57:39 -0500855/* Write various chunks */
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500856
857/* Write the IHDR chunk, and update the png_struct with the necessary
858 * information.
859 */
John Bowlerb5d00512012-03-09 09:15:18 -0600860PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr,
861 png_uint_32 width, png_uint_32 height, int bit_depth, int color_type,
862 int compression_method, int filter_method, int interlace_method),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500863
John Bowler572b0782012-01-31 07:09:34 -0600864PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr,
865 png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500866
John Bowlerb5d00512012-03-09 09:15:18 -0600867PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr,
868 png_const_bytep row_data, png_alloc_size_t row_data_length, int flush),
869 PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500870
John Bowler572b0782012-01-31 07:09:34 -0600871PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500872
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -0500873#ifdef PNG_WRITE_gAMA_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -0600874PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr,
875 png_fixed_point file_gamma),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500876#endif
877
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -0500878#ifdef PNG_WRITE_sBIT_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -0600879PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr,
880 png_const_color_8p sbit, int color_type),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500881#endif
882
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -0500883#ifdef PNG_WRITE_cHRM_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -0600884PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr,
John Bowlerb11b31a2012-03-21 07:55:46 -0500885 const png_xy *xy), PNG_EMPTY);
886 /* The xy value must have been previously validated */
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500887#endif
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500888
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -0500889#ifdef PNG_WRITE_sRGB_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -0600890PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr,
891 int intent),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500892#endif
893
Glenn Randers-Pehrson4e6b5e92009-09-23 10:24:53 -0500894#ifdef PNG_WRITE_iCCP_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -0600895PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr,
John Bowlerb11b31a2012-03-21 07:55:46 -0500896 png_const_charp name, png_const_bytep profile), PNG_EMPTY);
897 /* The profile must have been previously validated for correctness, the
898 * length comes from the first four bytes. Only the base, deflate,
899 * compression is supported.
900 */
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -0500901#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
John Bowler572b0782012-01-31 07:09:34 -06001312PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr,
1313 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001314
John Bowler572b0782012-01-31 07:09:34 -06001315PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_structrp png_ptr,
1316 png_uint_32 chunk_name),PNG_EMPTY);
Glenn Randers-Pehrsonbb5cb142011-09-22 12:41:58 -05001317
1318#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
1319/* Exactly as png_handle_as_unknown() except that the argument is a 32-bit chunk
1320 * name, not a string.
1321 */
John Bowler572b0782012-01-31 07:09:34 -06001322PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling,(png_structrp png_ptr,
1323 png_uint_32 chunk_name),PNG_EMPTY);
Glenn Randers-Pehrsonbb5cb142011-09-22 12:41:58 -05001324#endif
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001325
Glenn Randers-Pehrson6c7a09a2009-06-15 21:57:39 -05001326/* Handle the transformations for reading and writing */
John Bowler4a12f4a2011-04-17 18:34:22 -05001327#ifdef PNG_READ_TRANSFORMS_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001328PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr,
1329 png_row_infop row_info),PNG_EMPTY);
John Bowler4a12f4a2011-04-17 18:34:22 -05001330#endif
1331#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001332PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr,
1333 png_row_infop row_info),PNG_EMPTY);
John Bowler4a12f4a2011-04-17 18:34:22 -05001334#endif
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001335
John Bowler4a12f4a2011-04-17 18:34:22 -05001336#ifdef PNG_READ_TRANSFORMS_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001337PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr),PNG_EMPTY);
John Bowler4a12f4a2011-04-17 18:34:22 -05001338#endif
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001339
1340#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001341PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr,
1342 png_inforp info_ptr),PNG_EMPTY);
1343PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr,
1344 png_inforp info_ptr),PNG_EMPTY);
1345PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY);
1346PNG_INTERNAL_FUNCTION(void,png_push_crc_skip,(png_structrp png_ptr,
1347 png_uint_32 length),PNG_EMPTY);
1348PNG_INTERNAL_FUNCTION(void,png_push_crc_finish,(png_structrp png_ptr),PNG_EMPTY);
1349PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr),PNG_EMPTY);
1350PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr,
1351 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY);
1352PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY);
1353PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr,
1354 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY);
1355PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr),PNG_EMPTY);
1356PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr,
1357 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1358PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr,
1359 png_inforp info_ptr),PNG_EMPTY);
1360PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr,
1361 png_inforp info_ptr),PNG_EMPTY);
1362PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr, png_bytep row),PNG_EMPTY);
1363PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr,
1364 png_inforp info_ptr),PNG_EMPTY);
1365PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr,
1366 png_inforp info_ptr),PNG_EMPTY);
1367PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr),PNG_EMPTY);
Glenn Randers-Pehrsond4df36c2010-03-06 10:45:55 -06001368# ifdef PNG_READ_tEXt_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001369PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr,
1370 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1371PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr,
1372 png_inforp info_ptr),PNG_EMPTY);
Glenn Randers-Pehrsond4df36c2010-03-06 10:45:55 -06001373# endif
1374# ifdef PNG_READ_zTXt_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001375PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr,
1376 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1377PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr,
1378 png_inforp info_ptr),PNG_EMPTY);
Glenn Randers-Pehrsond4df36c2010-03-06 10:45:55 -06001379# endif
1380# ifdef PNG_READ_iTXt_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001381PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr,
1382 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1383PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr,
1384 png_inforp info_ptr),PNG_EMPTY);
Glenn Randers-Pehrsond4df36c2010-03-06 10:45:55 -06001385# endif
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001386
1387#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1388
1389#ifdef PNG_MNG_FEATURES_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001390PNG_INTERNAL_FUNCTION(void,png_do_read_intrapixel,(png_row_infop row_info,
1391 png_bytep row),PNG_EMPTY);
1392PNG_INTERNAL_FUNCTION(void,png_do_write_intrapixel,(png_row_infop row_info,
1393 png_bytep row),PNG_EMPTY);
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001394#endif
1395
John Bowlerb11b31a2012-03-21 07:55:46 -05001396/* Added at libpng version 1.6.0 */
1397#ifdef PNG_GAMMA_SUPPORTED
1398PNG_INTERNAL_FUNCTION(int,png_colorspace_set_gamma,(png_const_structrp png_ptr,
1399 png_colorspacerp colorspace, png_fixed_point gAMA, int preferred),
1400 PNG_EMPTY);
1401
1402PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr,
1403 png_inforp info_ptr), PNG_EMPTY);
1404 /* Synchronize the info 'valid' flags with the colorspace */
1405
1406PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr,
1407 png_inforp info_ptr), PNG_EMPTY);
1408 /* Copy the png_struct colorspace to the info_struct and call the above to
1409 * synchronize the flags. Checks for NULL info_ptr and does nothing.
1410 */
1411#endif
1412
Glenn Randers-Pehrsonf7831012008-11-13 06:05:13 -06001413/* Added at libpng version 1.4.0 */
John Bowlerb11b31a2012-03-21 07:55:46 -05001414#ifdef PNG_COLORSPACE_SUPPORTED
1415/* These internal functions are for maintaining the colorspace structure within
1416 * a png_info or png_struct (or, indeed, both).
John Bowler736f40f2011-08-25 16:19:44 -05001417 */
John Bowlerb11b31a2012-03-21 07:55:46 -05001418PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities,
1419 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy,
1420 int preferred), PNG_EMPTY);
1421
1422PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints,
1423 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ,
1424 int preferred), PNG_EMPTY);
1425
1426#ifdef PNG_sRGB_SUPPORTED
1427PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr,
1428 png_colorspacerp colorspace, int intent, int preferred), PNG_EMPTY);
1429#endif /* sRGB */
1430
1431#ifdef PNG_iCCP_SUPPORTED
1432PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr,
1433 png_colorspacerp colorspace, png_const_charp name,
1434 png_uint_32 profile_length, png_const_bytep profile, int preferred),
1435 PNG_EMPTY);
1436 /* The 'name' is used for information only */
1437
1438/* Routines for checking parts of an ICC profile. */
1439PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr,
1440 png_colorspacerp colorspace, png_const_charp name,
1441 png_uint_32 profile_length), PNG_EMPTY);
1442PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr,
1443 png_colorspacerp colorspace, png_const_charp name,
1444 png_uint_32 profile_length,
1445 png_const_bytep profile /* first 132 bytes only */), PNG_EMPTY);
1446PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr,
1447 png_colorspacerp colorspace, png_const_charp name,
1448 png_uint_32 profile_length,
1449 png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY);
John Bowler921648a2012-03-28 23:36:12 -05001450PNG_INTERNAL_FUNCTION(int,png_icc_set_gAMA_and_cHRM,(
John Bowlerb11b31a2012-03-21 07:55:46 -05001451 png_const_structrp png_ptr, png_colorspacerp colorspace,
John Bowler921648a2012-03-28 23:36:12 -05001452 png_const_charp name, png_const_bytep profile, uLong adler, int preferred),
1453 PNG_EMPTY);
1454 /* 'adler' is the Adler32 checksum of the uncompressed profile data, it may
1455 * be 0 to indicate that it is not available. It is used, if provided, as a
1456 * fast check on the profile when checking to see if it is sRGB.
1457 */
John Bowlerb11b31a2012-03-21 07:55:46 -05001458#endif /* iCCP */
1459
1460#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
1461PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients,
1462 (png_structrp png_ptr), PNG_EMPTY);
1463 /* Set the rgb_to_gray coefficients from the colorspace Y values */
1464#endif /* READ_RGB_TO_GRAY */
1465#endif /* COLORSPACE */
John Bowler9b979b12011-08-16 22:58:33 -05001466
Glenn Randers-Pehrson134bbe42009-09-24 18:10:49 -05001467/* Added at libpng version 1.4.0 */
John Bowler572b0782012-01-31 07:09:34 -06001468PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr,
Glenn Randers-Pehrsone8b1aa02010-03-06 11:39:29 -06001469 png_uint_32 width, png_uint_32 height, int bit_depth,
1470 int color_type, int interlace_type, int compression_type,
John Bowler572b0782012-01-31 07:09:34 -06001471 int filter_type),PNG_EMPTY);
Glenn Randers-Pehrson134bbe42009-09-24 18:10:49 -05001472
Glenn Randers-Pehrsoneeb1bb62012-03-02 22:10:15 -06001473/* Added at libpng version 1.5.10 */
1474#if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \
1475 defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED)
1476PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes,
1477 (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY);
1478#endif
1479
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001480#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
John Bowler572b0782012-01-31 07:09:34 -06001481PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr,
Glenn Randers-Pehrson77396b62010-08-02 08:00:10 -05001482 png_const_charp name),PNG_NORETURN);
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001483#endif
1484
John Bowler88b77cc2011-05-05 06:49:55 -05001485/* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite
1486 * the end. Always leaves the buffer nul terminated. Never errors out (and
1487 * there is no error code.)
1488 */
John Bowler572b0782012-01-31 07:09:34 -06001489PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize,
1490 size_t pos, png_const_charp string),PNG_EMPTY);
John Bowler88b77cc2011-05-05 06:49:55 -05001491
John Bowlerc5bef942011-05-05 17:35:39 -05001492/* Various internal functions to handle formatted warning messages, currently
1493 * only implemented for warnings.
1494 */
1495#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)
John Bowler88b77cc2011-05-05 06:49:55 -05001496/* Utility to dump an unsigned value into a buffer, given a start pointer and
1497 * and end pointer (which should point just *beyond* the end of the buffer!)
1498 * Returns the pointer to the start of the formatted string. This utility only
1499 * does unsigned values.
1500 */
John Bowler572b0782012-01-31 07:09:34 -06001501PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start,
1502 png_charp end, int format, png_alloc_size_t number),PNG_EMPTY);
John Bowler88b77cc2011-05-05 06:49:55 -05001503
1504/* Convenience macro that takes an array: */
1505#define PNG_FORMAT_NUMBER(buffer,format,number) \
1506 png_format_number(buffer, buffer + (sizeof buffer), format, number)
1507
1508/* Suggested size for a number buffer (enough for 64 bits and a sign!) */
1509#define PNG_NUMBER_BUFFER_SIZE 24
1510
1511/* These are the integer formats currently supported, the name is formed from
1512 * the standard printf(3) format string.
1513 */
1514#define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */
1515#define PNG_NUMBER_FORMAT_02u 2
1516#define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */
1517#define PNG_NUMBER_FORMAT_02d 2
1518#define PNG_NUMBER_FORMAT_x 3
1519#define PNG_NUMBER_FORMAT_02x 4
1520#define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */
1521#endif
1522
1523#ifdef PNG_WARNINGS_SUPPORTED
Glenn Randers-Pehrsonef217b72011-06-15 12:58:27 -05001524/* New defines and members adding in libpng-1.5.4 */
John Bowler88b77cc2011-05-05 06:49:55 -05001525# define PNG_WARNING_PARAMETER_SIZE 32
John Bowler00c6a9a2012-01-14 19:44:43 -06001526# define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */
John Bowler88b77cc2011-05-05 06:49:55 -05001527
1528/* An l-value of this type has to be passed to the APIs below to cache the
1529 * values of the parameters to a formatted warning message.
1530 */
1531typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][
1532 PNG_WARNING_PARAMETER_SIZE];
1533
John Bowler572b0782012-01-31 07:09:34 -06001534PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p,
1535 int number, png_const_charp string),PNG_EMPTY);
1536 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters,
1537 * including the trailing '\0'.
1538 */
1539PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned,
1540 (png_warning_parameters p, int number, int format, png_alloc_size_t value),
1541 PNG_EMPTY);
1542 /* Use png_alloc_size_t because it is an unsigned type as big as any we
1543 * need to output. Use the following for a signed value.
1544 */
1545PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed,
1546 (png_warning_parameters p, int number, int format, png_int_32 value),
1547 PNG_EMPTY);
John Bowler88b77cc2011-05-05 06:49:55 -05001548
John Bowler572b0782012-01-31 07:09:34 -06001549PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr,
1550 png_warning_parameters p, png_const_charp message),PNG_EMPTY);
1551 /* 'message' follows the X/Open approach of using @1, @2 to insert
1552 * parameters previously supplied using the above functions. Errors in
1553 * specifying the parameters will simple result in garbage substitutions.
1554 */
John Bowler88b77cc2011-05-05 06:49:55 -05001555#endif
1556
John Bowler2bc76ff2012-03-18 22:37:25 -05001557#ifdef PNG_BENIGN_ERRORS_SUPPORTED
1558/* Application errors (new in 1.6); use these functions (declared below) for
1559 * errors in the parameters or order of API function calls on read. The
1560 * 'warning' should be used for an error that can be handled completely, the
1561 * 'error' for one which can be handled safely but which may lose application
1562 * information or settings.
1563 *
1564 * By default these both result in a png_error call prior to release, while in a
1565 * released version the 'warning' is just a warning. However if the application
1566 * explicitly disables benign errors (explicitly permitting the code to lose
1567 * information) they both turn into warnings.
1568 *
1569 * If benign errors aren't supported they end up as the corresponding base call
1570 * (png_warning or png_error.)
1571 */
1572PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr,
1573 png_const_charp message),PNG_EMPTY);
1574 /* The application provided invalid parameters to an API function or called
1575 * an API function at the wrong time, libpng can completely recovered.
1576 */
1577
1578PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr,
1579 png_const_charp message),PNG_EMPTY);
1580 /* As above but libpng will ignore the call, or attempt some other partial
1581 * recovery from the error.
1582 */
1583#else
1584# define png_app_warning(pp,s) png_warning(pp,s)
1585# define png_app_error(pp,s) png_error(pp,s)
1586#endif
1587
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001588/* ASCII to FP interfaces, currently only implemented if sCAL
1589 * support is required.
1590 */
Glenn Randers-Pehrson48dc6eb2010-07-31 07:09:58 -05001591#if defined(PNG_READ_sCAL_SUPPORTED)
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001592/* MAX_DIGITS is actually the maximum number of characters in an sCAL
1593 * width or height, derived from the precision (number of significant
Glenn Randers-Pehrson665031e2012-01-13 22:03:10 -06001594 * digits - a build time settable option) and assumptions about the
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001595 * maximum ridiculous exponent.
1596 */
1597#define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/)
Glenn Randers-Pehrson48dc6eb2010-07-31 07:09:58 -05001598
1599#ifdef PNG_FLOATING_POINT_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001600PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr,
1601 png_charp ascii, png_size_t size, double fp, unsigned int precision),
1602 PNG_EMPTY);
Glenn Randers-Pehrson48dc6eb2010-07-31 07:09:58 -05001603#endif /* FLOATING_POINT */
1604
1605#ifdef PNG_FIXED_POINT_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001606PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr,
1607 png_charp ascii, png_size_t size, png_fixed_point fp),PNG_EMPTY);
Glenn Randers-Pehrson48dc6eb2010-07-31 07:09:58 -05001608#endif /* FIXED_POINT */
1609#endif /* READ_sCAL */
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001610
1611#if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED)
1612/* An internal API to validate the format of a floating point number.
1613 * The result is the index of the next character. If the number is
1614 * not valid it will be the index of a character in the supposed number.
1615 *
1616 * The format of a number is defined in the PNG extensions specification
1617 * and this API is strictly conformant to that spec, not anyone elses!
1618 *
1619 * The format as a regular expression is:
1620 *
1621 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)?
1622 *
1623 * or:
1624 *
1625 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)?
1626 *
1627 * The complexity is that either integer or fraction must be present and the
1628 * fraction is permitted to have no digits only if the integer is present.
1629 *
1630 * NOTE: The dangling E problem.
1631 * There is a PNG valid floating point number in the following:
1632 *
1633 * PNG floating point numb1.ers are not greedy.
1634 *
1635 * Working this out requires *TWO* character lookahead (because of the
1636 * sign), the parser does not do this - it will fail at the 'r' - this
1637 * doesn't matter for PNG sCAL chunk values, but it requires more care
1638 * if the value were ever to be embedded in something more complex. Use
1639 * ANSI-C strtod if you need the lookahead.
1640 */
1641/* State table for the parser. */
1642#define PNG_FP_INTEGER 0 /* before or in integer */
1643#define PNG_FP_FRACTION 1 /* before or in fraction */
1644#define PNG_FP_EXPONENT 2 /* before or in exponent */
1645#define PNG_FP_STATE 3 /* mask for the above */
1646#define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */
1647#define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */
1648#define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */
1649#define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */
1650#define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */
John Bowler8d261262011-06-18 13:37:11 -05001651
1652/* These three values don't affect the parser. They are set but not used.
1653 */
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001654#define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */
John Bowler8d261262011-06-18 13:37:11 -05001655#define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */
1656#define PNG_FP_NONZERO 256 /* A non-zero value */
1657#define PNG_FP_STICKY 448 /* The above three flags */
1658
1659/* This is available for the caller to store in 'state' if required. Do not
1660 * call the parser after setting it (the parser sometimes clears it.)
1661 */
1662#define PNG_FP_INVALID 512 /* Available for callers as a distinct value */
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001663
1664/* Result codes for the parser (boolean - true meants ok, false means
1665 * not ok yet.)
1666 */
1667#define PNG_FP_MAYBE 0 /* The number may be valid in the future */
1668#define PNG_FP_OK 1 /* The number is valid */
1669
John Bowler8d261262011-06-18 13:37:11 -05001670/* Tests on the sticky non-zero and negative flags. To pass these checks
1671 * the state must also indicate that the whole number is valid - this is
1672 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this
1673 * is equivalent to PNG_FP_OK above.)
1674 */
1675#define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO)
1676 /* NZ_MASK: the string is valid and a non-zero negative value */
1677#define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO)
1678 /* Z MASK: the string is valid and a non-zero value. */
1679 /* PNG_FP_SAW_DIGIT: the string is valid. */
1680#define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT)
1681#define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK)
1682#define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK)
John Bowler6f237b62012-03-02 13:13:15 -06001683
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001684/* The actual parser. This can be called repeatedly, it updates
1685 * the index into the string and the state variable (which must
1686 * be initialzed to 0). It returns a result code, as above. There
1687 * is no point calling the parser any more if it fails to advance to
1688 * the end of the string - it is stuck on an invalid character (or
1689 * terminated by '\0').
1690 *
1691 * Note that the pointer will consume an E or even an E+ then leave
1692 * a 'maybe' state even though a preceding integer.fraction is valid.
1693 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was
1694 * a valid number. It's possible to recover from this by calling
1695 * the parser again (from the start, with state 0) but with a string
1696 * that omits the last character (i.e. set the size to the index of
1697 * the problem character.) This has not been tested within libpng.
1698 */
John Bowler572b0782012-01-31 07:09:34 -06001699PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string,
1700 png_size_t size, int *statep, png_size_tp whereami),PNG_EMPTY);
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001701
1702/* This is the same but it checks a complete string and returns true
John Bowler8d261262011-06-18 13:37:11 -05001703 * only if it just contains a floating point number. As of 1.5.4 this
1704 * function also returns the state at the end of parsing the number if
1705 * it was valid (otherwise it returns 0.) This can be used for testing
1706 * for negative or zero values using the sticky flag.
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001707 */
John Bowler572b0782012-01-31 07:09:34 -06001708PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string,
1709 png_size_t size),PNG_EMPTY);
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001710#endif /* pCAL || sCAL */
1711
Glenn Randers-Pehrson48dc6eb2010-07-31 07:09:58 -05001712#if defined(PNG_READ_GAMMA_SUPPORTED) ||\
1713 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED)
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001714/* Added at libpng version 1.5.0 */
1715/* This is a utility to provide a*times/div (rounded) and indicate
1716 * if there is an overflow. The result is a boolean - false (0)
1717 * for overflow, true (1) if no overflow, in which case *res
1718 * holds the result.
1719 */
John Bowler572b0782012-01-31 07:09:34 -06001720PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a,
1721 png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY);
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001722#endif
1723
1724#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED)
1725/* Same deal, but issue a warning on overflow and return 0. */
John Bowler572b0782012-01-31 07:09:34 -06001726PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn,
1727 (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by,
1728 png_int_32 divided_by),PNG_EMPTY);
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001729#endif
1730
1731#ifdef PNG_READ_GAMMA_SUPPORTED
1732/* Calculate a reciprocal - used for gamma values. This returns
1733 * 0 if the argument is 0 in order to maintain an undefined value,
1734 * there are no warnings.
1735 */
John Bowler572b0782012-01-31 07:09:34 -06001736PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a),
1737 PNG_EMPTY);
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001738
1739/* The same but gives a reciprocal of the product of two fixed point
1740 * values. Accuracy is suitable for gamma calculations but this is
1741 * not exact - use png_muldiv for that.
1742 */
John Bowler572b0782012-01-31 07:09:34 -06001743PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a,
1744 png_fixed_point b),PNG_EMPTY);
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001745#endif
1746
1747#ifdef PNG_READ_GAMMA_SUPPORTED
1748/* Internal fixed point gamma correction. These APIs are called as
1749 * required to convert single values - they don't need to be fast,
1750 * they are not used when processing image pixel values.
1751 *
1752 * While the input is an 'unsigned' value it must actually be the
1753 * correct bit value - 0..255 or 0..65535 as required.
1754 */
John Bowler572b0782012-01-31 07:09:34 -06001755PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr,
1756 unsigned int value, png_fixed_point gamma_value),PNG_EMPTY);
1757PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value),
1758 PNG_EMPTY);
1759PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value,
1760 png_fixed_point gamma_value),PNG_EMPTY);
1761PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value,
1762 png_fixed_point gamma_value),PNG_EMPTY);
1763PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr),
1764 PNG_EMPTY);
1765PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr,
1766 int bit_depth),PNG_EMPTY);
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001767#endif
Glenn Randers-Pehrsond29033f2009-11-07 10:46:42 -06001768
John Bowler7875d532011-11-07 22:33:49 -06001769/* SIMPLIFIED READ/WRITE SUPPORT */
1770#if defined PNG_SIMPLIFIED_READ_SUPPORTED ||\
1771 defined PNG_SIMPLIFIED_WRITE_SUPPORTED
1772/* The internal structure that png_image::opaque points to. */
1773typedef struct png_control
1774{
John Bowler5bc90382012-01-23 22:43:22 -06001775 png_structp png_ptr;
1776 png_infop info_ptr;
1777 png_voidp error_buf; /* Always a jmp_buf at present. */
John Bowler7875d532011-11-07 22:33:49 -06001778
John Bowler5bc90382012-01-23 22:43:22 -06001779 png_const_bytep memory; /* Memory buffer. */
1780 png_size_t size; /* Size of the memory buffer. */
John Bowler7875d532011-11-07 22:33:49 -06001781
John Bowler5bc90382012-01-23 22:43:22 -06001782 unsigned int for_write :1; /* Otherwise it is a read structure */
1783 unsigned int owned_file :1; /* We own the file in io_ptr */
John Bowler7875d532011-11-07 22:33:49 -06001784} png_control;
1785
John Bowler4fa96a42011-11-16 16:39:16 -06001786/* Return the pointer to the jmp_buf from a png_control: necessary because C
1787 * does not reveal the type of the elements of jmp_buf.
1788 */
1789#ifdef __cplusplus
1790# define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0])
1791#else
1792# define png_control_jmp_buf(pc) ((pc)->error_buf)
1793#endif
1794
John Bowler7875d532011-11-07 22:33:49 -06001795/* Utility to safely execute a piece of libpng code catching and logging any
1796 * errors that might occur. Returns true on success, false on failure (either
1797 * of the function or as a result of a png_error.)
1798 */
John Bowler572b0782012-01-31 07:09:34 -06001799PNG_INTERNAL_FUNCTION(void,png_safe_error,(png_structp png_ptr,
1800 png_const_charp error_message),PNG_NORETURN);
John Bowler7875d532011-11-07 22:33:49 -06001801
1802#ifdef PNG_WARNINGS_SUPPORTED
John Bowler572b0782012-01-31 07:09:34 -06001803PNG_INTERNAL_FUNCTION(void,png_safe_warning,(png_structp png_ptr,
1804 png_const_charp warning_message),PNG_EMPTY);
John Bowler7875d532011-11-07 22:33:49 -06001805#else
1806# define png_safe_warning 0/*dummy argument*/
1807#endif
1808
John Bowler572b0782012-01-31 07:09:34 -06001809PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image,
1810 int (*function)(png_voidp), png_voidp arg),PNG_EMPTY);
John Bowler7875d532011-11-07 22:33:49 -06001811
1812/* Utility to log an error, this also cleans up the png_image, the function
1813 * always returns 0 (false).
1814 */
John Bowler572b0782012-01-31 07:09:34 -06001815PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image,
1816 png_const_charp error_message),PNG_EMPTY);
John Bowler7875d532011-11-07 22:33:49 -06001817
1818#endif /* SIMPLIFIED READ/WRITE */
1819
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001820/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
1821
Glenn Randers-Pehrson31aee0d2010-07-29 17:39:14 -05001822#include "pngdebug.h"
1823
Glenn Randers-Pehrson17218292006-04-20 07:20:46 -05001824#ifdef __cplusplus
1825}
1826#endif
1827
Glenn Randers-Pehrsonbeb572e2006-08-19 13:59:24 -05001828#endif /* PNGPRIV_H */