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1 | |
2 /* pngpriv.h - private declarations for use inside libpng | |
3 * | |
4 * For conditions of distribution and use, see copyright notice in png.h | |
5 * Copyright (c) 1998-2013 Glenn Randers-Pehrson | |
6 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) | |
7 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) | |
8 * | |
9 * Last changed in libpng 1.6.3 [July 18, 2013] | |
10 * | |
11 * This code is released under the libpng license. | |
12 * For conditions of distribution and use, see the disclaimer | |
13 * and license in png.h | |
14 */ | |
15 | |
16 /* The symbols declared in this file (including the functions declared | |
17 * as extern) are PRIVATE. They are not part of the libpng public | |
18 * 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 | |
27 | |
28 /* 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 */ | |
41 | |
42 #ifndef PNG_VERSION_INFO_ONLY | |
43 /* Standard library headers not required by png.h: */ | |
44 # include <stdlib.h> | |
45 # include <string.h> | |
46 #endif | |
47 | |
48 #define PNGLIB_BUILD /*libpng is being built, not used*/ | |
49 | |
50 /* If HAVE_CONFIG_H is defined during the build then the build system must | |
51 * provide an appropriate "config.h" file on the include path. The header file | |
52 * must provide definitions as required below (search for "HAVE_CONFIG_H"); | |
53 * see configure.ac for more details of the requirements. The macro | |
54 * "PNG_NO_CONFIG_H" is provided for maintainers to test for dependencies on | |
55 * 'configure'; define this macro to prevent the configure build including the | |
56 * configure generated config.h. Libpng is expected to compile without *any* | |
57 * special build system support on a reasonably ANSI-C compliant system. | |
58 */ | |
59 #if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H) | |
60 # include <config.h> | |
61 | |
62 /* Pick up the definition of 'restrict' from config.h if it was read: */ | |
63 # define PNG_RESTRICT restrict | |
64 #endif | |
65 | |
66 /* To support symbol prefixing it is necessary to know *before* including png.h | |
67 * whether the fixed point (and maybe other) APIs are exported, because if they | |
68 * are not internal definitions may be required. This is handled below just | |
69 * before png.h is included, but load the configuration now if it is available. | |
70 */ | |
71 #ifndef PNGLCONF_H | |
72 # include "pnglibconf.h" | |
73 #endif | |
74 | |
75 /* Local renames may change non-exported API functions from png.h */ | |
76 #if defined(PNG_PREFIX) && !defined(PNGPREFIX_H) | |
77 # include "pngprefix.h" | |
78 #endif | |
79 | |
80 #ifdef PNG_USER_CONFIG | |
81 # include "pngusr.h" | |
82 /* These should have been defined in pngusr.h */ | |
83 # ifndef PNG_USER_PRIVATEBUILD | |
84 # define PNG_USER_PRIVATEBUILD "Custom libpng build" | |
85 # endif | |
86 # ifndef PNG_USER_DLLFNAME_POSTFIX | |
87 # define PNG_USER_DLLFNAME_POSTFIX "Cb" | |
88 # endif | |
89 #endif | |
90 | |
91 /* Compile time options. | |
92 * ===================== | |
93 * In a multi-arch build the compiler may compile the code several times for the | |
94 * same object module, producing different binaries for different architectures. | |
95 * When this happens configure-time setting of the target host options cannot be | |
96 * done and this interferes with the handling of the ARM NEON optimizations, and | |
97 * possibly other similar optimizations. Put additional tests here; in general | |
98 * this is needed when the same option can be changed at both compile time and | |
99 * run time depending on the target OS (i.e. iOS vs Android.) | |
100 * | |
101 * NOTE: symbol prefixing does not pass $(CFLAGS) to the preprocessor, because | |
102 * this is not possible with certain compilers (Oracle SUN OS CC), as a result | |
103 * it is necessary to ensure that all extern functions that *might* be used | |
104 * regardless of $(CFLAGS) get declared in this file. The test on __ARM_NEON__ | |
105 * below is one example of this behavior because it is controlled by the | |
106 * presence or not of -mfpu=neon on the GCC command line, it is possible to do | |
107 * this in $(CC), e.g. "CC=gcc -mfpu=neon", but people who build libpng rarely | |
108 * do this. | |
109 */ | |
110 #ifndef PNG_ARM_NEON_OPT | |
111 /* ARM NEON optimizations are being controlled by the compiler settings, | |
112 * typically the target FPU. If the FPU has been set to NEON (-mfpu=neon | |
113 * with GCC) then the compiler will define __ARM_NEON__ and we can rely | |
114 * unconditionally on NEON instructions not crashing, otherwise we must | |
115 * disable use of NEON instructions: | |
116 */ | |
117 # ifdef __ARM_NEON__ | |
118 # define PNG_ARM_NEON_OPT 2 | |
119 # else | |
120 # define PNG_ARM_NEON_OPT 0 | |
121 # endif | |
122 #endif | |
123 | |
124 #if PNG_ARM_NEON_OPT > 0 | |
125 /* NEON optimizations are to be at least considered by libpng, so enable the | |
126 * callbacks to do this. | |
127 */ | |
128 /* | |
129 * Disabled by sbc since this copy of libpng doesn't contains the arm | |
130 * specific code (e.g. arm/arm_init.c) | |
131 */ | |
132 /*# define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_neon*/ | |
133 #endif | |
134 | |
135 /* Is this a build of a DLL where compilation of the object modules requires | |
136 * different preprocessor settings to those required for a simple library? If | |
137 * so PNG_BUILD_DLL must be set. | |
138 * | |
139 * If libpng is used inside a DLL but that DLL does not export the libpng APIs | |
140 * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a | |
141 * static library of libpng then link the DLL against that. | |
142 */ | |
143 #ifndef PNG_BUILD_DLL | |
144 # ifdef DLL_EXPORT | |
145 /* This is set by libtool when files are compiled for a DLL; libtool | |
146 * always compiles twice, even on systems where it isn't necessary. Set | |
147 * PNG_BUILD_DLL in case it is necessary: | |
148 */ | |
149 # define PNG_BUILD_DLL | |
150 # else | |
151 # ifdef _WINDLL | |
152 /* This is set by the Microsoft Visual Studio IDE in projects that | |
153 * build a DLL. It can't easily be removed from those projects (it | |
154 * isn't visible in the Visual Studio UI) so it is a fairly reliable | |
155 * indication that PNG_IMPEXP needs to be set to the DLL export | |
156 * attributes. | |
157 */ | |
158 # define PNG_BUILD_DLL | |
159 # else | |
160 # ifdef __DLL__ | |
161 /* This is set by the Borland C system when compiling for a DLL | |
162 * (as above.) | |
163 */ | |
164 # define PNG_BUILD_DLL | |
165 # else | |
166 /* Add additional compiler cases here. */ | |
167 # endif | |
168 # endif | |
169 # endif | |
170 #endif /* Setting PNG_BUILD_DLL if required */ | |
171 | |
172 /* See pngconf.h for more details: the builder of the library may set this on | |
173 * the command line to the right thing for the specific compilation system or it | |
174 * may be automagically set above (at present we know of no system where it does | |
175 * need to be set on the command line.) | |
176 * | |
177 * PNG_IMPEXP must be set here when building the library to prevent pngconf.h | |
178 * setting it to the "import" setting for a DLL build. | |
179 */ | |
180 #ifndef PNG_IMPEXP | |
181 # ifdef PNG_BUILD_DLL | |
182 # define PNG_IMPEXP PNG_DLL_EXPORT | |
183 # else | |
184 /* Not building a DLL, or the DLL doesn't require specific export | |
185 * definitions. | |
186 */ | |
187 # define PNG_IMPEXP | |
188 # endif | |
189 #endif | |
190 | |
191 /* No warnings for private or deprecated functions in the build: */ | |
192 #ifndef PNG_DEPRECATED | |
193 # define PNG_DEPRECATED | |
194 #endif | |
195 #ifndef PNG_PRIVATE | |
196 # define PNG_PRIVATE | |
197 #endif | |
198 | |
199 /* Symbol preprocessing support. | |
200 * | |
201 * To enable listing global, but internal, symbols the following macros should | |
202 * always be used to declare an extern data or function object in this file. | |
203 */ | |
204 #ifndef PNG_INTERNAL_DATA | |
205 # define PNG_INTERNAL_DATA(type, name, array) extern type name array | |
206 #endif | |
207 | |
208 #ifndef PNG_INTERNAL_FUNCTION | |
209 # define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\ | |
210 extern PNG_FUNCTION(type, name, args, PNG_EMPTY attributes) | |
211 #endif | |
212 | |
213 /* If floating or fixed point APIs are disabled they may still be compiled | |
214 * internally. To handle this make sure they are declared as the appropriate | |
215 * internal extern function (otherwise the symbol prefixing stuff won't work and | |
216 * the functions will be used without definitions.) | |
217 * | |
218 * NOTE: although all the API functions are declared here they are not all | |
219 * actually built! Because the declarations are still made it is necessary to | |
220 * fake out types that they depend on. | |
221 */ | |
222 #ifndef PNG_FP_EXPORT | |
223 # ifndef PNG_FLOATING_POINT_SUPPORTED | |
224 # define PNG_FP_EXPORT(ordinal, type, name, args)\ | |
225 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); | |
226 # ifndef PNG_VERSION_INFO_ONLY | |
227 typedef struct png_incomplete png_double; | |
228 typedef png_double* png_doublep; | |
229 typedef const png_double* png_const_doublep; | |
230 typedef png_double** png_doublepp; | |
231 # endif | |
232 # endif | |
233 #endif | |
234 #ifndef PNG_FIXED_EXPORT | |
235 # ifndef PNG_FIXED_POINT_SUPPORTED | |
236 # define PNG_FIXED_EXPORT(ordinal, type, name, args)\ | |
237 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); | |
238 # endif | |
239 #endif | |
240 | |
241 #include "png.h" | |
242 | |
243 /* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */ | |
244 #ifndef PNG_DLL_EXPORT | |
245 # define PNG_DLL_EXPORT | |
246 #endif | |
247 | |
248 /* SECURITY and SAFETY: | |
249 * | |
250 * By default libpng is built without any internal limits on image size, | |
251 * individual heap (png_malloc) allocations or the total amount of memory used. | |
252 * If PNG_SAFE_LIMITS_SUPPORTED is defined, however, the limits below are used | |
253 * (unless individually overridden). These limits are believed to be fairly | |
254 * safe, but builders of secure systems should verify the values against the | |
255 * real system capabilities. | |
256 */ | |
257 #ifdef PNG_SAFE_LIMITS_SUPPORTED | |
258 /* 'safe' limits */ | |
259 # ifndef PNG_USER_WIDTH_MAX | |
260 # define PNG_USER_WIDTH_MAX 1000000 | |
261 # endif | |
262 # ifndef PNG_USER_HEIGHT_MAX | |
263 # define PNG_USER_HEIGHT_MAX 1000000 | |
264 # endif | |
265 # ifndef PNG_USER_CHUNK_CACHE_MAX | |
266 # define PNG_USER_CHUNK_CACHE_MAX 128 | |
267 # endif | |
268 # ifndef PNG_USER_CHUNK_MALLOC_MAX | |
269 # define PNG_USER_CHUNK_MALLOC_MAX 8000000 | |
270 # endif | |
271 #else | |
272 /* values for no limits */ | |
273 # ifndef PNG_USER_WIDTH_MAX | |
274 # define PNG_USER_WIDTH_MAX 0x7fffffff | |
275 # endif | |
276 # ifndef PNG_USER_HEIGHT_MAX | |
277 # define PNG_USER_HEIGHT_MAX 0x7fffffff | |
278 # endif | |
279 # ifndef PNG_USER_CHUNK_CACHE_MAX | |
280 # define PNG_USER_CHUNK_CACHE_MAX 0 | |
281 # endif | |
282 # ifndef PNG_USER_CHUNK_MALLOC_MAX | |
283 # define PNG_USER_CHUNK_MALLOC_MAX 0 | |
284 # endif | |
285 #endif | |
286 | |
287 /* Moved to pngpriv.h at libpng-1.5.0 */ | |
288 /* NOTE: some of these may have been used in external applications as | |
289 * these definitions were exposed in pngconf.h prior to 1.5. | |
290 */ | |
291 | |
292 /* If you are running on a machine where you cannot allocate more | |
293 * than 64K of memory at once, uncomment this. While libpng will not | |
294 * normally need that much memory in a chunk (unless you load up a very | |
295 * large file), zlib needs to know how big of a chunk it can use, and | |
296 * libpng thus makes sure to check any memory allocation to verify it | |
297 * will fit into memory. | |
298 * | |
299 * zlib provides 'MAXSEG_64K' which, if defined, indicates the | |
300 * same limit and pngconf.h (already included) sets the limit | |
301 * if certain operating systems are detected. | |
302 */ | |
303 #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K) | |
304 # define PNG_MAX_MALLOC_64K | |
305 #endif | |
306 | |
307 #ifndef PNG_UNUSED | |
308 /* Unused formal parameter warnings are silenced using the following macro | |
309 * which is expected to have no bad effects on performance (optimizing | |
310 * compilers will probably remove it entirely). Note that if you replace | |
311 * it with something other than whitespace, you must include the terminating | |
312 * semicolon. | |
313 */ | |
314 # define PNG_UNUSED(param) (void)param; | |
315 #endif | |
316 | |
317 /* Just a little check that someone hasn't tried to define something | |
318 * contradictory. | |
319 */ | |
320 #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K) | |
321 # undef PNG_ZBUF_SIZE | |
322 # define PNG_ZBUF_SIZE 65536L | |
323 #endif | |
324 | |
325 /* If warnings or errors are turned off the code is disabled or redirected here. | |
326 * From 1.5.4 functions have been added to allow very limited formatting of | |
327 * error and warning messages - this code will also be disabled here. | |
328 */ | |
329 #ifdef PNG_WARNINGS_SUPPORTED | |
330 # define PNG_WARNING_PARAMETERS(p) png_warning_parameters p; | |
331 #else | |
332 # define png_warning(s1,s2) ((void)(s1)) | |
333 # define png_chunk_warning(s1,s2) ((void)(s1)) | |
334 # define png_warning_parameter(p,number,string) ((void)0) | |
335 # define png_warning_parameter_unsigned(p,number,format,value) ((void)0) | |
336 # define png_warning_parameter_signed(p,number,format,value) ((void)0) | |
337 # define png_formatted_warning(pp,p,message) ((void)(pp)) | |
338 # define PNG_WARNING_PARAMETERS(p) | |
339 #endif | |
340 #ifndef PNG_ERROR_TEXT_SUPPORTED | |
341 # define png_error(s1,s2) png_err(s1) | |
342 # define png_chunk_error(s1,s2) png_err(s1) | |
343 # define png_fixed_error(s1,s2) png_err(s1) | |
344 #endif | |
345 | |
346 /* C allows up-casts from (void*) to any pointer and (const void*) to any | |
347 * pointer to a const object. C++ regards this as a type error and requires an | |
348 * explicit, static, cast and provides the static_cast<> rune to ensure that | |
349 * const is not cast away. | |
350 */ | |
351 #ifdef __cplusplus | |
352 # define png_voidcast(type, value) static_cast<type>(value) | |
353 # define png_constcast(type, value) const_cast<type>(value) | |
354 # define png_aligncast(type, value) \ | |
355 static_cast<type>(static_cast<void*>(value)) | |
356 # define png_aligncastconst(type, value) \ | |
357 static_cast<type>(static_cast<const void*>(value)) | |
358 #else | |
359 # define png_voidcast(type, value) (value) | |
360 # define png_constcast(type, value) ((type)(value)) | |
361 # define png_aligncast(type, value) ((void*)(value)) | |
362 # define png_aligncastconst(type, value) ((const void*)(value)) | |
363 #endif /* __cplusplus */ | |
364 | |
365 /* Some fixed point APIs are still required even if not exported because | |
366 * they get used by the corresponding floating point APIs. This magic | |
367 * deals with this: | |
368 */ | |
369 #ifdef PNG_FIXED_POINT_SUPPORTED | |
370 # define PNGFAPI PNGAPI | |
371 #else | |
372 # define PNGFAPI /* PRIVATE */ | |
373 #endif | |
374 | |
375 #ifndef PNG_VERSION_INFO_ONLY | |
376 /* Other defines specific to compilers can go here. Try to keep | |
377 * them inside an appropriate ifdef/endif pair for portability. | |
378 */ | |
379 #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\ | |
380 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) | |
381 /* png.c requires the following ANSI-C constants if the conversion of | |
382 * floating point to ASCII is implemented therein: | |
383 * | |
384 * DBL_DIG Maximum number of decimal digits (can be set to any constant) | |
385 * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value) | |
386 * DBL_MAX Maximum floating point number (can be set to an arbitrary value) | |
387 */ | |
388 # include <float.h> | |
389 | |
390 # if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \ | |
391 defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC) | |
392 /* We need to check that <math.h> hasn't already been included earlier | |
393 * as it seems it doesn't agree with <fp.h>, yet we should really use | |
394 * <fp.h> if possible. | |
395 */ | |
396 # if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__) | |
397 # include <fp.h> | |
398 # endif | |
399 # else | |
400 # include <math.h> | |
401 # endif | |
402 # if defined(_AMIGA) && defined(__SASC) && defined(_M68881) | |
403 /* Amiga SAS/C: We must include builtin FPU functions when compiling using | |
404 * MATH=68881 | |
405 */ | |
406 # include <m68881.h> | |
407 # endif | |
408 #endif | |
409 | |
410 /* This provides the non-ANSI (far) memory allocation routines. */ | |
411 #if defined(__TURBOC__) && defined(__MSDOS__) | |
412 # include <mem.h> | |
413 # include <alloc.h> | |
414 #endif | |
415 | |
416 #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \ | |
417 defined(_WIN32) || defined(__WIN32__) | |
418 # include <windows.h> /* defines _WINDOWS_ macro */ | |
419 #endif | |
420 #endif /* PNG_VERSION_INFO_ONLY */ | |
421 | |
422 /* Moved here around 1.5.0beta36 from pngconf.h */ | |
423 /* Users may want to use these so they are not private. Any library | |
424 * functions that are passed far data must be model-independent. | |
425 */ | |
426 | |
427 /* Memory model/platform independent fns */ | |
428 #ifndef PNG_ABORT | |
429 # ifdef _WINDOWS_ | |
430 # define PNG_ABORT() ExitProcess(0) | |
431 # else | |
432 # define PNG_ABORT() abort() | |
433 # endif | |
434 #endif | |
435 | |
436 /* These macros may need to be architecture dependent. */ | |
437 #define PNG_ALIGN_NONE 0 /* do not use data alignment */ | |
438 #define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */ | |
439 #ifdef offsetof | |
440 # define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */ | |
441 #else | |
442 # define PNG_ALIGN_OFFSET -1 /* prevent the use of this */ | |
443 #endif | |
444 #define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */ | |
445 | |
446 #ifndef PNG_ALIGN_TYPE | |
447 /* Default to using aligned access optimizations and requiring alignment to a | |
448 * multiple of the data type size. Override in a compiler specific fashion | |
449 * if necessary by inserting tests here: | |
450 */ | |
451 # define PNG_ALIGN_TYPE PNG_ALIGN_SIZE | |
452 #endif | |
453 | |
454 #if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE | |
455 /* This is used because in some compiler implementations non-aligned | |
456 * structure members are supported, so the offsetof approach below fails. | |
457 * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access | |
458 * is good for performance. Do not do this unless you have tested the result | |
459 * and understand it. | |
460 */ | |
461 # define png_alignof(type) (sizeof (type)) | |
462 #else | |
463 # if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET | |
464 # define png_alignof(type) offsetof(struct{char c; type t;}, t) | |
465 # else | |
466 # if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS | |
467 # define png_alignof(type) (1) | |
468 # endif | |
469 /* Else leave png_alignof undefined to prevent use thereof */ | |
470 # endif | |
471 #endif | |
472 | |
473 /* This implicitly assumes alignment is always to a power of 2. */ | |
474 #ifdef png_alignof | |
475 # define png_isaligned(ptr, type)\ | |
476 ((((const char*)ptr-(const char*)0) & (png_alignof(type)-1)) == 0) | |
477 #else | |
478 # define png_isaligned(ptr, type) 0 | |
479 #endif | |
480 | |
481 /* End of memory model/platform independent support */ | |
482 /* End of 1.5.0beta36 move from pngconf.h */ | |
483 | |
484 /* CONSTANTS and UTILITY MACROS | |
485 * These are used internally by libpng and not exposed in the API | |
486 */ | |
487 | |
488 /* Various modes of operation. Note that after an init, mode is set to | |
489 * zero automatically when the structure is created. Three of these | |
490 * are defined in png.h because they need to be visible to applications | |
491 * that call png_set_unknown_chunk(). | |
492 */ | |
493 /* #define PNG_HAVE_IHDR 0x01 (defined in png.h) */ | |
494 /* #define PNG_HAVE_PLTE 0x02 (defined in png.h) */ | |
495 #define PNG_HAVE_IDAT 0x04 | |
496 /* #define PNG_AFTER_IDAT 0x08 (defined in png.h) */ | |
497 #define PNG_HAVE_IEND 0x10 | |
498 /* 0x20 (unused) */ | |
499 /* 0x40 (unused) */ | |
500 /* 0x80 (unused) */ | |
501 #define PNG_HAVE_CHUNK_HEADER 0x100 | |
502 #define PNG_WROTE_tIME 0x200 | |
503 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400 | |
504 #define PNG_BACKGROUND_IS_GRAY 0x800 | |
505 #define PNG_HAVE_PNG_SIGNATURE 0x1000 | |
506 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ | |
507 /* 0x4000 (unused) */ | |
508 #define PNG_IS_READ_STRUCT 0x8000 /* Else is a write struct */ | |
509 | |
510 /* Flags for the transformations the PNG library does on the image data */ | |
511 #define PNG_BGR 0x0001 | |
512 #define PNG_INTERLACE 0x0002 | |
513 #define PNG_PACK 0x0004 | |
514 #define PNG_SHIFT 0x0008 | |
515 #define PNG_SWAP_BYTES 0x0010 | |
516 #define PNG_INVERT_MONO 0x0020 | |
517 #define PNG_QUANTIZE 0x0040 | |
518 #define PNG_COMPOSE 0x0080 /* Was PNG_BACKGROUND */ | |
519 #define PNG_BACKGROUND_EXPAND 0x0100 | |
520 #define PNG_EXPAND_16 0x0200 /* Added to libpng 1.5.2 */ | |
521 #define PNG_16_TO_8 0x0400 /* Becomes 'chop' in 1.5.4 */ | |
522 #define PNG_RGBA 0x0800 | |
523 #define PNG_EXPAND 0x1000 | |
524 #define PNG_GAMMA 0x2000 | |
525 #define PNG_GRAY_TO_RGB 0x4000 | |
526 #define PNG_FILLER 0x8000 | |
527 #define PNG_PACKSWAP 0x10000 | |
528 #define PNG_SWAP_ALPHA 0x20000 | |
529 #define PNG_STRIP_ALPHA 0x40000 | |
530 #define PNG_INVERT_ALPHA 0x80000 | |
531 #define PNG_USER_TRANSFORM 0x100000 | |
532 #define PNG_RGB_TO_GRAY_ERR 0x200000 | |
533 #define PNG_RGB_TO_GRAY_WARN 0x400000 | |
534 #define PNG_RGB_TO_GRAY 0x600000 /* two bits, RGB_TO_GRAY_ERR|WARN */ | |
535 #define PNG_ENCODE_ALPHA 0x800000 /* Added to libpng-1.5.4 */ | |
536 #define PNG_ADD_ALPHA 0x1000000 /* Added to libpng-1.2.7 */ | |
537 #define PNG_EXPAND_tRNS 0x2000000 /* Added to libpng-1.2.9 */ | |
538 #define PNG_SCALE_16_TO_8 0x4000000 /* Added to libpng-1.5.4 */ | |
539 /* 0x8000000 unused */ | |
540 /* 0x10000000 unused */ | |
541 /* 0x20000000 unused */ | |
542 /* 0x40000000 unused */ | |
543 /* Flags for png_create_struct */ | |
544 #define PNG_STRUCT_PNG 0x0001 | |
545 #define PNG_STRUCT_INFO 0x0002 | |
546 | |
547 /* Scaling factor for filter heuristic weighting calculations */ | |
548 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) | |
549 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) | |
550 | |
551 /* Flags for the png_ptr->flags rather than declaring a byte for each one */ | |
552 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 | |
553 #define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002 /* Added to libpng-1.6.0 */ | |
554 /* 0x0004 unused */ | |
555 #define PNG_FLAG_ZSTREAM_ENDED 0x0008 /* Added to libpng-1.6.0 */ | |
556 /* 0x0010 unused */ | |
557 /* 0x0020 unused */ | |
558 #define PNG_FLAG_ROW_INIT 0x0040 | |
559 #define PNG_FLAG_FILLER_AFTER 0x0080 | |
560 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 | |
561 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 | |
562 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 | |
563 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 | |
564 #define PNG_FLAG_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.4 */ | |
565 #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.4 */ | |
566 #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.4 */ | |
567 /* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000 */ | |
568 /* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000 */ | |
569 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000 | |
570 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000 | |
571 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000 | |
572 #define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000 /* Added to libpng-1.4.0 */ | |
573 #define PNG_FLAG_APP_WARNINGS_WARN 0x200000 /* Added to libpng-1.6.0 */ | |
574 #define PNG_FLAG_APP_ERRORS_WARN 0x400000 /* Added to libpng-1.6.0 */ | |
575 /* 0x800000 unused */ | |
576 /* 0x1000000 unused */ | |
577 /* 0x2000000 unused */ | |
578 /* 0x4000000 unused */ | |
579 /* 0x8000000 unused */ | |
580 /* 0x10000000 unused */ | |
581 /* 0x20000000 unused */ | |
582 /* 0x40000000 unused */ | |
583 | |
584 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ | |
585 PNG_FLAG_CRC_ANCILLARY_NOWARN) | |
586 | |
587 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ | |
588 PNG_FLAG_CRC_CRITICAL_IGNORE) | |
589 | |
590 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ | |
591 PNG_FLAG_CRC_CRITICAL_MASK) | |
592 | |
593 /* Save typing and make code easier to understand */ | |
594 | |
595 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ | |
596 abs((int)((c1).green) - (int)((c2).green)) + \ | |
597 abs((int)((c1).blue) - (int)((c2).blue))) | |
598 | |
599 /* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255 | |
600 * by dividing by 257 *with rounding*. This macro is exact for the given range. | |
601 * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the | |
602 * macro were established by experiment (modifying the added value). The macro | |
603 * has a second variant that takes a value already scaled by 255 and divides by | |
604 * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it | |
605 * only gives off-by-one errors and only for 0.5% (1 in 200) of the values. | |
606 */ | |
607 #define PNG_DIV65535(v24) (((v24) + 32895) >> 16) | |
608 #define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255) | |
609 | |
610 /* Added to libpng-1.2.6 JB */ | |
611 #define PNG_ROWBYTES(pixel_bits, width) \ | |
612 ((pixel_bits) >= 8 ? \ | |
613 ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \ | |
614 (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) ) | |
615 | |
616 /* PNG_OUT_OF_RANGE returns true if value is outside the range | |
617 * ideal-delta..ideal+delta. Each argument is evaluated twice. | |
618 * "ideal" and "delta" should be constants, normally simple | |
619 * integers, "value" a variable. Added to libpng-1.2.6 JB | |
620 */ | |
621 #define PNG_OUT_OF_RANGE(value, ideal, delta) \ | |
622 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) | |
623 | |
624 /* Conversions between fixed and floating point, only defined if | |
625 * required (to make sure the code doesn't accidentally use float | |
626 * when it is supposedly disabled.) | |
627 */ | |
628 #ifdef PNG_FLOATING_POINT_SUPPORTED | |
629 /* The floating point conversion can't overflow, though it can and | |
630 * does lose accuracy relative to the original fixed point value. | |
631 * In practice this doesn't matter because png_fixed_point only | |
632 * stores numbers with very low precision. The png_ptr and s | |
633 * arguments are unused by default but are there in case error | |
634 * checking becomes a requirement. | |
635 */ | |
636 #define png_float(png_ptr, fixed, s) (.00001 * (fixed)) | |
637 | |
638 /* The fixed point conversion performs range checking and evaluates | |
639 * its argument multiple times, so must be used with care. The | |
640 * range checking uses the PNG specification values for a signed | |
641 * 32 bit fixed point value except that the values are deliberately | |
642 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly | |
643 * (2^31-1) * 100000). 's' is a string that describes the value being | |
644 * converted. | |
645 * | |
646 * NOTE: this macro will raise a png_error if the range check fails, | |
647 * therefore it is normally only appropriate to use this on values | |
648 * that come from API calls or other sources where an out of range | |
649 * error indicates a programming error, not a data error! | |
650 * | |
651 * NOTE: by default this is off - the macro is not used - because the | |
652 * function call saves a lot of code. | |
653 */ | |
654 #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED | |
655 #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\ | |
656 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0)) | |
657 #endif | |
658 /* else the corresponding function is defined below, inside the scope of the | |
659 * cplusplus test. | |
660 */ | |
661 #endif | |
662 | |
663 /* Constants for known chunk types. If you need to add a chunk, define the name | |
664 * here. For historical reasons these constants have the form png_<name>; i.e. | |
665 * the prefix is lower case. Please use decimal values as the parameters to | |
666 * match the ISO PNG specification and to avoid relying on the C locale | |
667 * interpretation of character values. | |
668 * | |
669 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values | |
670 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string | |
671 * to be generated if required. | |
672 * | |
673 * PNG_32b correctly produces a value shifted by up to 24 bits, even on | |
674 * architectures where (int) is only 16 bits. | |
675 */ | |
676 #define PNG_32b(b,s) ((png_uint_32)(b) << (s)) | |
677 #define PNG_U32(b1,b2,b3,b4) \ | |
678 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0)) | |
679 | |
680 /* Constants for known chunk types. | |
681 * | |
682 * MAINTAINERS: If you need to add a chunk, define the name here. | |
683 * For historical reasons these constants have the form png_<name>; i.e. | |
684 * the prefix is lower case. Please use decimal values as the parameters to | |
685 * match the ISO PNG specification and to avoid relying on the C locale | |
686 * interpretation of character values. Please keep the list sorted. | |
687 * | |
688 * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk | |
689 * type. In fact the specification does not express chunk types this way, | |
690 * however using a 32-bit value means that the chunk type can be read from the | |
691 * stream using exactly the same code as used for a 32-bit unsigned value and | |
692 * can be examined far more efficiently (using one arithmetic compare). | |
693 * | |
694 * Prior to 1.5.6 the chunk type constants were expressed as C strings. The | |
695 * libpng API still uses strings for 'unknown' chunks and a macro, | |
696 * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice | |
697 * that for portable code numeric values must still be used; the string "IHDR" | |
698 * is not portable and neither is PNG_U32('I', 'H', 'D', 'R'). | |
699 * | |
700 * In 1.7.0 the definitions will be made public in png.h to avoid having to | |
701 * duplicate the same definitions in application code. | |
702 */ | |
703 #define png_IDAT PNG_U32( 73, 68, 65, 84) | |
704 #define png_IEND PNG_U32( 73, 69, 78, 68) | |
705 #define png_IHDR PNG_U32( 73, 72, 68, 82) | |
706 #define png_PLTE PNG_U32( 80, 76, 84, 69) | |
707 #define png_bKGD PNG_U32( 98, 75, 71, 68) | |
708 #define png_cHRM PNG_U32( 99, 72, 82, 77) | |
709 #define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */ | |
710 #define png_gAMA PNG_U32(103, 65, 77, 65) | |
711 #define png_gIFg PNG_U32(103, 73, 70, 103) | |
712 #define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */ | |
713 #define png_gIFx PNG_U32(103, 73, 70, 120) | |
714 #define png_hIST PNG_U32(104, 73, 83, 84) | |
715 #define png_iCCP PNG_U32(105, 67, 67, 80) | |
716 #define png_iTXt PNG_U32(105, 84, 88, 116) | |
717 #define png_oFFs PNG_U32(111, 70, 70, 115) | |
718 #define png_pCAL PNG_U32(112, 67, 65, 76) | |
719 #define png_pHYs PNG_U32(112, 72, 89, 115) | |
720 #define png_sBIT PNG_U32(115, 66, 73, 84) | |
721 #define png_sCAL PNG_U32(115, 67, 65, 76) | |
722 #define png_sPLT PNG_U32(115, 80, 76, 84) | |
723 #define png_sRGB PNG_U32(115, 82, 71, 66) | |
724 #define png_sTER PNG_U32(115, 84, 69, 82) | |
725 #define png_tEXt PNG_U32(116, 69, 88, 116) | |
726 #define png_tIME PNG_U32(116, 73, 77, 69) | |
727 #define png_tRNS PNG_U32(116, 82, 78, 83) | |
728 #define png_zTXt PNG_U32(122, 84, 88, 116) | |
729 | |
730 /* The following will work on (signed char*) strings, whereas the get_uint_32 | |
731 * macro will fail on top-bit-set values because of the sign extension. | |
732 */ | |
733 #define PNG_CHUNK_FROM_STRING(s)\ | |
734 PNG_U32(0xff&(s)[0], 0xff&(s)[1], 0xff&(s)[2], 0xff&(s)[3]) | |
735 | |
736 /* This uses (char), not (png_byte) to avoid warnings on systems where (char) is | |
737 * signed and the argument is a (char[]) This macro will fail miserably on | |
738 * systems where (char) is more than 8 bits. | |
739 */ | |
740 #define PNG_STRING_FROM_CHUNK(s,c)\ | |
741 (void)(((char*)(s))[0]=(char)((c)>>24), ((char*)(s))[1]=(char)((c)>>16),\ | |
742 ((char*)(s))[2]=(char)((c)>>8), ((char*)(s))[3]=(char)((c))) | |
743 | |
744 /* Do the same but terminate with a null character. */ | |
745 #define PNG_CSTRING_FROM_CHUNK(s,c)\ | |
746 (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0) | |
747 | |
748 /* Test on flag values as defined in the spec (section 5.4): */ | |
749 #define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29)) | |
750 #define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c)) | |
751 #define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21)) | |
752 #define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13)) | |
753 #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5)) | |
754 | |
755 /* Gamma values (new at libpng-1.5.4): */ | |
756 #define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */ | |
757 #define PNG_GAMMA_MAC_INVERSE 65909 | |
758 #define PNG_GAMMA_sRGB_INVERSE 45455 | |
759 | |
760 /* Almost everything below is C specific; the #defines above can be used in | |
761 * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot. | |
762 */ | |
763 #ifndef PNG_VERSION_INFO_ONLY | |
764 | |
765 #include "pngstruct.h" | |
766 #include "pnginfo.h" | |
767 | |
768 /* Validate the include paths - the include path used to generate pnglibconf.h | |
769 * must match that used in the build, or we must be using pnglibconf.h.prebuilt: | |
770 */ | |
771 #if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM | |
772 # error ZLIB_VERNUM != PNG_ZLIB_VERNUM \ | |
773 "-I (include path) error: see the notes in pngpriv.h" | |
774 /* This means that when pnglibconf.h was built the copy of zlib.h that it | |
775 * used is not the same as the one being used here. Because the build of | |
776 * libpng makes decisions to use inflateInit2 and inflateReset2 based on the | |
777 * zlib version number and because this affects handling of certain broken | |
778 * PNG files the -I directives must match. | |
779 * | |
780 * The most likely explanation is that you passed a -I in CFLAGS, this will | |
781 * not work; all the preprocessor directories and in particular all the -I | |
782 * directives must be in CPPFLAGS. | |
783 */ | |
784 #endif | |
785 | |
786 /* This is used for 16 bit gamma tables -- only the top level pointers are | |
787 * const; this could be changed: | |
788 */ | |
789 typedef const png_uint_16p * png_const_uint_16pp; | |
790 | |
791 /* Added to libpng-1.5.7: sRGB conversion tables */ | |
792 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ | |
793 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) | |
794 #ifdef PNG_SIMPLIFIED_READ_SUPPORTED | |
795 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]); | |
796 /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value, | |
797 * 0..65535. This table gives the closest 16-bit answers (no errors). | |
798 */ | |
799 #endif | |
800 | |
801 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]); | |
802 PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]); | |
803 | |
804 #define PNG_sRGB_FROM_LINEAR(linear) ((png_byte)((png_sRGB_base[(linear)>>15] +\ | |
805 ((((linear)&0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8)) | |
806 /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB | |
807 * encoded value with maximum error 0.646365. Note that the input is not a | |
808 * 16-bit value; it has been multiplied by 255! */ | |
809 #endif /* PNG_SIMPLIFIED_READ/WRITE */ | |
810 | |
811 | |
812 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ | |
813 #ifdef __cplusplus | |
814 extern "C" { | |
815 #endif /* __cplusplus */ | |
816 | |
817 /* Internal functions; these are not exported from a DLL however because they | |
818 * are used within several of the C source files they have to be C extern. | |
819 * | |
820 * All of these functions must be declared with PNG_INTERNAL_FUNCTION. | |
821 */ | |
822 | |
823 /* Zlib support */ | |
824 #define PNG_UNEXPECTED_ZLIB_RETURN (-7) | |
825 PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret), | |
826 PNG_EMPTY); | |
827 /* Used by the zlib handling functions to ensure that z_stream::msg is always | |
828 * set before they return. | |
829 */ | |
830 | |
831 #ifdef PNG_WRITE_SUPPORTED | |
832 PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr, | |
833 png_compression_bufferp *list),PNG_EMPTY); | |
834 /* Free the buffer list used by the compressed write code. */ | |
835 #endif | |
836 | |
837 #if defined(PNG_FLOATING_POINT_SUPPORTED) && \ | |
838 !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \ | |
839 (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \ | |
840 defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \ | |
841 defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \ | |
842 (defined(PNG_sCAL_SUPPORTED) && \ | |
843 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)) | |
844 PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr, | |
845 double fp, png_const_charp text),PNG_EMPTY); | |
846 #endif | |
847 | |
848 /* Check the user version string for compatibility, returns false if the version | |
849 * numbers aren't compatible. | |
850 */ | |
851 PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr, | |
852 png_const_charp user_png_ver),PNG_EMPTY); | |
853 | |
854 /* Internal base allocator - no messages, NULL on failure to allocate. This | |
855 * does, however, call the application provided allocator and that could call | |
856 * png_error (although that would be a bug in the application implementation.) | |
857 */ | |
858 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr, | |
859 png_alloc_size_t size),PNG_ALLOCATED); | |
860 | |
861 #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\ | |
862 defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED) | |
863 /* Internal array allocator, outputs no error or warning messages on failure, | |
864 * just returns NULL. | |
865 */ | |
866 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr, | |
867 int nelements, size_t element_size),PNG_ALLOCATED); | |
868 | |
869 /* The same but an existing array is extended by add_elements. This function | |
870 * also memsets the new elements to 0 and copies the old elements. The old | |
871 * array is not freed or altered. | |
872 */ | |
873 PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr, | |
874 png_const_voidp array, int old_elements, int add_elements, | |
875 size_t element_size),PNG_ALLOCATED); | |
876 #endif /* text, sPLT or unknown chunks */ | |
877 | |
878 /* Magic to create a struct when there is no struct to call the user supplied | |
879 * memory allocators. Because error handling has not been set up the memory | |
880 * handlers can't safely call png_error, but this is an obscure and undocumented | |
881 * restriction so libpng has to assume that the 'free' handler, at least, might | |
882 * call png_error. | |
883 */ | |
884 PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct, | |
885 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, | |
886 png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, | |
887 png_free_ptr free_fn),PNG_ALLOCATED); | |
888 | |
889 /* Free memory from internal libpng struct */ | |
890 PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr), | |
891 PNG_EMPTY); | |
892 | |
893 /* Free an allocated jmp_buf (always succeeds) */ | |
894 PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY); | |
895 | |
896 /* Function to allocate memory for zlib. PNGAPI is disallowed. */ | |
897 PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size), | |
898 PNG_ALLOCATED); | |
899 | |
900 /* Function to free memory for zlib. PNGAPI is disallowed. */ | |
901 PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY); | |
902 | |
903 /* Next four functions are used internally as callbacks. PNGCBAPI is required | |
904 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to | |
905 * PNGCBAPI at 1.5.0 | |
906 */ | |
907 | |
908 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr, | |
909 png_bytep data, png_size_t length),PNG_EMPTY); | |
910 | |
911 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED | |
912 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr, | |
913 png_bytep buffer, png_size_t length),PNG_EMPTY); | |
914 #endif | |
915 | |
916 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr, | |
917 png_bytep data, png_size_t length),PNG_EMPTY); | |
918 | |
919 #ifdef PNG_WRITE_FLUSH_SUPPORTED | |
920 # ifdef PNG_STDIO_SUPPORTED | |
921 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr), | |
922 PNG_EMPTY); | |
923 # endif | |
924 #endif | |
925 | |
926 /* Reset the CRC variable */ | |
927 PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY); | |
928 | |
929 /* Write the "data" buffer to whatever output you are using */ | |
930 PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr, | |
931 png_const_bytep data, png_size_t length),PNG_EMPTY); | |
932 | |
933 /* Read and check the PNG file signature */ | |
934 PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr, | |
935 png_inforp info_ptr),PNG_EMPTY); | |
936 | |
937 /* Read the chunk header (length + type name) */ | |
938 PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr), | |
939 PNG_EMPTY); | |
940 | |
941 /* Read data from whatever input you are using into the "data" buffer */ | |
942 PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data, | |
943 png_size_t length),PNG_EMPTY); | |
944 | |
945 /* Read bytes into buf, and update png_ptr->crc */ | |
946 PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf, | |
947 png_uint_32 length),PNG_EMPTY); | |
948 | |
949 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ | |
950 PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr, | |
951 png_uint_32 skip),PNG_EMPTY); | |
952 | |
953 /* Read the CRC from the file and compare it to the libpng calculated CRC */ | |
954 PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY); | |
955 | |
956 /* Calculate the CRC over a section of data. Note that we are only | |
957 * passing a maximum of 64K on systems that have this as a memory limit, | |
958 * since this is the maximum buffer size we can specify. | |
959 */ | |
960 PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr, | |
961 png_const_bytep ptr, png_size_t length),PNG_EMPTY); | |
962 | |
963 #ifdef PNG_WRITE_FLUSH_SUPPORTED | |
964 PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY); | |
965 #endif | |
966 | |
967 /* Write various chunks */ | |
968 | |
969 /* Write the IHDR chunk, and update the png_struct with the necessary | |
970 * information. | |
971 */ | |
972 PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr, | |
973 png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, | |
974 int compression_method, int filter_method, int interlace_method),PNG_EMPTY); | |
975 | |
976 PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr, | |
977 png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY); | |
978 | |
979 PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr, | |
980 png_const_bytep row_data, png_alloc_size_t row_data_length, int flush), | |
981 PNG_EMPTY); | |
982 | |
983 PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY); | |
984 | |
985 #ifdef PNG_WRITE_gAMA_SUPPORTED | |
986 PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr, | |
987 png_fixed_point file_gamma),PNG_EMPTY); | |
988 #endif | |
989 | |
990 #ifdef PNG_WRITE_sBIT_SUPPORTED | |
991 PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr, | |
992 png_const_color_8p sbit, int color_type),PNG_EMPTY); | |
993 #endif | |
994 | |
995 #ifdef PNG_WRITE_cHRM_SUPPORTED | |
996 PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr, | |
997 const png_xy *xy), PNG_EMPTY); | |
998 /* The xy value must have been previously validated */ | |
999 #endif | |
1000 | |
1001 #ifdef PNG_WRITE_sRGB_SUPPORTED | |
1002 PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr, | |
1003 int intent),PNG_EMPTY); | |
1004 #endif | |
1005 | |
1006 #ifdef PNG_WRITE_iCCP_SUPPORTED | |
1007 PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr, | |
1008 png_const_charp name, png_const_bytep profile), PNG_EMPTY); | |
1009 /* The profile must have been previously validated for correctness, the | |
1010 * length comes from the first four bytes. Only the base, deflate, | |
1011 * compression is supported. | |
1012 */ | |
1013 #endif | |
1014 | |
1015 #ifdef PNG_WRITE_sPLT_SUPPORTED | |
1016 PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr, | |
1017 png_const_sPLT_tp palette),PNG_EMPTY); | |
1018 #endif | |
1019 | |
1020 #ifdef PNG_WRITE_tRNS_SUPPORTED | |
1021 PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr, | |
1022 png_const_bytep trans, png_const_color_16p values, int number, | |
1023 int color_type),PNG_EMPTY); | |
1024 #endif | |
1025 | |
1026 #ifdef PNG_WRITE_bKGD_SUPPORTED | |
1027 PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr, | |
1028 png_const_color_16p values, int color_type),PNG_EMPTY); | |
1029 #endif | |
1030 | |
1031 #ifdef PNG_WRITE_hIST_SUPPORTED | |
1032 PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr, | |
1033 png_const_uint_16p hist, int num_hist),PNG_EMPTY); | |
1034 #endif | |
1035 | |
1036 /* Chunks that have keywords */ | |
1037 #ifdef PNG_WRITE_tEXt_SUPPORTED | |
1038 PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr, | |
1039 png_const_charp key, png_const_charp text, png_size_t text_len),PNG_EMPTY); | |
1040 #endif | |
1041 | |
1042 #ifdef PNG_WRITE_zTXt_SUPPORTED | |
1043 PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp | |
1044 key, png_const_charp text, png_size_t text_len, int compression),PNG_EMPTY); | |
1045 #endif | |
1046 | |
1047 #ifdef PNG_WRITE_iTXt_SUPPORTED | |
1048 PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr, | |
1049 int compression, png_const_charp key, png_const_charp lang, | |
1050 png_const_charp lang_key, png_const_charp text),PNG_EMPTY); | |
1051 #endif | |
1052 | |
1053 #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ | |
1054 PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr, | |
1055 png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY); | |
1056 #endif | |
1057 | |
1058 #ifdef PNG_WRITE_oFFs_SUPPORTED | |
1059 PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr, | |
1060 png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY); | |
1061 #endif | |
1062 | |
1063 #ifdef PNG_WRITE_pCAL_SUPPORTED | |
1064 PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr, | |
1065 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, | |
1066 png_const_charp units, png_charpp params),PNG_EMPTY); | |
1067 #endif | |
1068 | |
1069 #ifdef PNG_WRITE_pHYs_SUPPORTED | |
1070 PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr, | |
1071 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, | |
1072 int unit_type),PNG_EMPTY); | |
1073 #endif | |
1074 | |
1075 #ifdef PNG_WRITE_tIME_SUPPORTED | |
1076 PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr, | |
1077 png_const_timep mod_time),PNG_EMPTY); | |
1078 #endif | |
1079 | |
1080 #ifdef PNG_WRITE_sCAL_SUPPORTED | |
1081 PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr, | |
1082 int unit, png_const_charp width, png_const_charp height),PNG_EMPTY); | |
1083 #endif | |
1084 | |
1085 /* Called when finished processing a row of data */ | |
1086 PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr), | |
1087 PNG_EMPTY); | |
1088 | |
1089 /* Internal use only. Called before first row of data */ | |
1090 PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr), | |
1091 PNG_EMPTY); | |
1092 | |
1093 /* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an | |
1094 * array of png_ptr->width pixels. If the image is not interlaced or this | |
1095 * is the final pass this just does a memcpy, otherwise the "display" flag | |
1096 * is used to determine whether to copy pixels that are not in the current pass. | |
1097 * | |
1098 * Because 'png_do_read_interlace' (below) replicates pixels this allows this | |
1099 * function to achieve the documented 'blocky' appearance during interlaced read | |
1100 * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row' | |
1101 * are not changed if they are not in the current pass, when display is 0. | |
1102 * | |
1103 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless. | |
1104 * | |
1105 * The API always reads from the png_struct row buffer and always assumes that | |
1106 * it is full width (png_do_read_interlace has already been called.) | |
1107 * | |
1108 * This function is only ever used to write to row buffers provided by the | |
1109 * caller of the relevant libpng API and the row must have already been | |
1110 * transformed by the read transformations. | |
1111 * | |
1112 * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed | |
1113 * bitmasks for use within the code, otherwise runtime generated masks are used. | |
1114 * The default is compile time masks. | |
1115 */ | |
1116 #ifndef PNG_USE_COMPILE_TIME_MASKS | |
1117 # define PNG_USE_COMPILE_TIME_MASKS 1 | |
1118 #endif | |
1119 PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr, | |
1120 png_bytep row, int display),PNG_EMPTY); | |
1121 | |
1122 #ifdef PNG_READ_INTERLACING_SUPPORTED | |
1123 /* Expand an interlaced row: the 'row_info' describes the pass data that has | |
1124 * been read in and must correspond to the pixels in 'row', the pixels are | |
1125 * expanded (moved apart) in 'row' to match the final layout, when doing this | |
1126 * the pixels are *replicated* to the intervening space. This is essential for | |
1127 * the correct operation of png_combine_row, above. | |
1128 */ | |
1129 PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info, | |
1130 png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY); | |
1131 #endif | |
1132 | |
1133 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ | |
1134 | |
1135 #ifdef PNG_WRITE_INTERLACING_SUPPORTED | |
1136 /* Grab pixels out of a row for an interlaced pass */ | |
1137 PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info, | |
1138 png_bytep row, int pass),PNG_EMPTY); | |
1139 #endif | |
1140 | |
1141 /* Unfilter a row: check the filter value before calling this, there is no point | |
1142 * calling it for PNG_FILTER_VALUE_NONE. | |
1143 */ | |
1144 PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop | |
1145 row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY); | |
1146 | |
1147 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info, | |
1148 png_bytep row, png_const_bytep prev_row),PNG_EMPTY); | |
1149 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop | |
1150 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); | |
1151 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop | |
1152 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); | |
1153 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop | |
1154 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); | |
1155 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop | |
1156 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); | |
1157 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop | |
1158 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); | |
1159 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop | |
1160 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); | |
1161 | |
1162 /* Choose the best filter to use and filter the row data */ | |
1163 PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr, | |
1164 png_row_infop row_info),PNG_EMPTY); | |
1165 | |
1166 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED | |
1167 PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr, | |
1168 png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY); | |
1169 /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer | |
1170 * is NULL the function checks, instead, for the end of the stream. In this | |
1171 * case a benign error will be issued if the stream end is not found or if | |
1172 * extra data has to be consumed. | |
1173 */ | |
1174 PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr), | |
1175 PNG_EMPTY); | |
1176 /* This cleans up when the IDAT LZ stream does not end when the last image | |
1177 * byte is read; there is still some pending input. | |
1178 */ | |
1179 | |
1180 PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr), | |
1181 PNG_EMPTY); | |
1182 /* Finish a row while reading, dealing with interlacing passes, etc. */ | |
1183 #endif | |
1184 | |
1185 /* Initialize the row buffers, etc. */ | |
1186 PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY); | |
1187 | |
1188 #ifdef PNG_READ_TRANSFORMS_SUPPORTED | |
1189 /* Optional call to update the users info structure */ | |
1190 PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr, | |
1191 png_inforp info_ptr),PNG_EMPTY); | |
1192 #endif | |
1193 | |
1194 /* These are the functions that do the transformations */ | |
1195 #ifdef PNG_READ_FILLER_SUPPORTED | |
1196 PNG_INTERNAL_FUNCTION(void,png_do_read_filler,(png_row_infop row_info, | |
1197 png_bytep row, png_uint_32 filler, png_uint_32 flags),PNG_EMPTY); | |
1198 #endif | |
1199 | |
1200 #ifdef PNG_READ_SWAP_ALPHA_SUPPORTED | |
1201 PNG_INTERNAL_FUNCTION(void,png_do_read_swap_alpha,(png_row_infop row_info, | |
1202 png_bytep row),PNG_EMPTY); | |
1203 #endif | |
1204 | |
1205 #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED | |
1206 PNG_INTERNAL_FUNCTION(void,png_do_write_swap_alpha,(png_row_infop row_info, | |
1207 png_bytep row),PNG_EMPTY); | |
1208 #endif | |
1209 | |
1210 #ifdef PNG_READ_INVERT_ALPHA_SUPPORTED | |
1211 PNG_INTERNAL_FUNCTION(void,png_do_read_invert_alpha,(png_row_infop row_info, | |
1212 png_bytep row),PNG_EMPTY); | |
1213 #endif | |
1214 | |
1215 #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED | |
1216 PNG_INTERNAL_FUNCTION(void,png_do_write_invert_alpha,(png_row_infop row_info, | |
1217 png_bytep row),PNG_EMPTY); | |
1218 #endif | |
1219 | |
1220 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ | |
1221 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) | |
1222 PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info, | |
1223 png_bytep row, int at_start),PNG_EMPTY); | |
1224 #endif | |
1225 | |
1226 #ifdef PNG_16BIT_SUPPORTED | |
1227 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) | |
1228 PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info, | |
1229 png_bytep row),PNG_EMPTY); | |
1230 #endif | |
1231 #endif | |
1232 | |
1233 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ | |
1234 defined(PNG_WRITE_PACKSWAP_SUPPORTED) | |
1235 PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info, | |
1236 png_bytep row),PNG_EMPTY); | |
1237 #endif | |
1238 | |
1239 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED | |
1240 PNG_INTERNAL_FUNCTION(int,png_do_rgb_to_gray,(png_structrp png_ptr, | |
1241 png_row_infop row_info, png_bytep row),PNG_EMPTY); | |
1242 #endif | |
1243 | |
1244 #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED | |
1245 PNG_INTERNAL_FUNCTION(void,png_do_gray_to_rgb,(png_row_infop row_info, | |
1246 png_bytep row),PNG_EMPTY); | |
1247 #endif | |
1248 | |
1249 #ifdef PNG_READ_PACK_SUPPORTED | |
1250 PNG_INTERNAL_FUNCTION(void,png_do_unpack,(png_row_infop row_info, | |
1251 png_bytep row),PNG_EMPTY); | |
1252 #endif | |
1253 | |
1254 #ifdef PNG_READ_SHIFT_SUPPORTED | |
1255 PNG_INTERNAL_FUNCTION(void,png_do_unshift,(png_row_infop row_info, | |
1256 png_bytep row, png_const_color_8p sig_bits),PNG_EMPTY); | |
1257 #endif | |
1258 | |
1259 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) | |
1260 PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info, | |
1261 png_bytep row),PNG_EMPTY); | |
1262 #endif | |
1263 | |
1264 #ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED | |
1265 PNG_INTERNAL_FUNCTION(void,png_do_scale_16_to_8,(png_row_infop row_info, | |
1266 png_bytep row),PNG_EMPTY); | |
1267 #endif | |
1268 | |
1269 #ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED | |
1270 PNG_INTERNAL_FUNCTION(void,png_do_chop,(png_row_infop row_info, | |
1271 png_bytep row),PNG_EMPTY); | |
1272 #endif | |
1273 | |
1274 #ifdef PNG_READ_QUANTIZE_SUPPORTED | |
1275 PNG_INTERNAL_FUNCTION(void,png_do_quantize,(png_row_infop row_info, | |
1276 png_bytep row, png_const_bytep palette_lookup, | |
1277 png_const_bytep quantize_lookup),PNG_EMPTY); | |
1278 | |
1279 # ifdef PNG_CORRECT_PALETTE_SUPPORTED | |
1280 PNG_INTERNAL_FUNCTION(void,png_correct_palette,(png_structrp png_ptr, | |
1281 png_colorp palette, int num_palette),PNG_EMPTY); | |
1282 # endif | |
1283 #endif | |
1284 | |
1285 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) | |
1286 PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info, | |
1287 png_bytep row),PNG_EMPTY); | |
1288 #endif | |
1289 | |
1290 #ifdef PNG_WRITE_PACK_SUPPORTED | |
1291 PNG_INTERNAL_FUNCTION(void,png_do_pack,(png_row_infop row_info, | |
1292 png_bytep row, png_uint_32 bit_depth),PNG_EMPTY); | |
1293 #endif | |
1294 | |
1295 #ifdef PNG_WRITE_SHIFT_SUPPORTED | |
1296 PNG_INTERNAL_FUNCTION(void,png_do_shift,(png_row_infop row_info, | |
1297 png_bytep row, png_const_color_8p bit_depth),PNG_EMPTY); | |
1298 #endif | |
1299 | |
1300 #if defined(PNG_READ_BACKGROUND_SUPPORTED) ||\ | |
1301 defined(PNG_READ_ALPHA_MODE_SUPPORTED) | |
1302 PNG_INTERNAL_FUNCTION(void,png_do_compose,(png_row_infop row_info, | |
1303 png_bytep row, png_structrp png_ptr),PNG_EMPTY); | |
1304 #endif | |
1305 | |
1306 #ifdef PNG_READ_GAMMA_SUPPORTED | |
1307 PNG_INTERNAL_FUNCTION(void,png_do_gamma,(png_row_infop row_info, | |
1308 png_bytep row, png_structrp png_ptr),PNG_EMPTY); | |
1309 #endif | |
1310 | |
1311 #ifdef PNG_READ_ALPHA_MODE_SUPPORTED | |
1312 PNG_INTERNAL_FUNCTION(void,png_do_encode_alpha,(png_row_infop row_info, | |
1313 png_bytep row, png_structrp png_ptr),PNG_EMPTY); | |
1314 #endif | |
1315 | |
1316 #ifdef PNG_READ_EXPAND_SUPPORTED | |
1317 PNG_INTERNAL_FUNCTION(void,png_do_expand_palette,(png_row_infop row_info, | |
1318 png_bytep row, png_const_colorp palette, png_const_bytep trans, | |
1319 int num_trans),PNG_EMPTY); | |
1320 PNG_INTERNAL_FUNCTION(void,png_do_expand,(png_row_infop row_info, | |
1321 png_bytep row, png_const_color_16p trans_color),PNG_EMPTY); | |
1322 #endif | |
1323 | |
1324 #ifdef PNG_READ_EXPAND_16_SUPPORTED | |
1325 PNG_INTERNAL_FUNCTION(void,png_do_expand_16,(png_row_infop row_info, | |
1326 png_bytep row),PNG_EMPTY); | |
1327 #endif | |
1328 | |
1329 /* The following decodes the appropriate chunks, and does error correction, | |
1330 * then calls the appropriate callback for the chunk if it is valid. | |
1331 */ | |
1332 | |
1333 /* Decode the IHDR chunk */ | |
1334 PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr, | |
1335 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
1336 PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr, | |
1337 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
1338 PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr, | |
1339 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
1340 | |
1341 #ifdef PNG_READ_bKGD_SUPPORTED | |
1342 PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr, | |
1343 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
1344 #endif | |
1345 | |
1346 #ifdef PNG_READ_cHRM_SUPPORTED | |
1347 PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr, | |
1348 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
1349 #endif | |
1350 | |
1351 #ifdef PNG_READ_gAMA_SUPPORTED | |
1352 PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr, | |
1353 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
1354 #endif | |
1355 | |
1356 #ifdef PNG_READ_hIST_SUPPORTED | |
1357 PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr, | |
1358 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
1359 #endif | |
1360 | |
1361 #ifdef PNG_READ_iCCP_SUPPORTED | |
1362 PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr, | |
1363 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
1364 #endif /* PNG_READ_iCCP_SUPPORTED */ | |
1365 | |
1366 #ifdef PNG_READ_iTXt_SUPPORTED | |
1367 PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr, | |
1368 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
1369 #endif | |
1370 | |
1371 #ifdef PNG_READ_oFFs_SUPPORTED | |
1372 PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr, | |
1373 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
1374 #endif | |
1375 | |
1376 #ifdef PNG_READ_pCAL_SUPPORTED | |
1377 PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr, | |
1378 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
1379 #endif | |
1380 | |
1381 #ifdef PNG_READ_pHYs_SUPPORTED | |
1382 PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr, | |
1383 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
1384 #endif | |
1385 | |
1386 #ifdef PNG_READ_sBIT_SUPPORTED | |
1387 PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr, | |
1388 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
1389 #endif | |
1390 | |
1391 #ifdef PNG_READ_sCAL_SUPPORTED | |
1392 PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr, | |
1393 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
1394 #endif | |
1395 | |
1396 #ifdef PNG_READ_sPLT_SUPPORTED | |
1397 PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr, | |
1398 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
1399 #endif /* PNG_READ_sPLT_SUPPORTED */ | |
1400 | |
1401 #ifdef PNG_READ_sRGB_SUPPORTED | |
1402 PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr, | |
1403 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
1404 #endif | |
1405 | |
1406 #ifdef PNG_READ_tEXt_SUPPORTED | |
1407 PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr, | |
1408 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
1409 #endif | |
1410 | |
1411 #ifdef PNG_READ_tIME_SUPPORTED | |
1412 PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr, | |
1413 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
1414 #endif | |
1415 | |
1416 #ifdef PNG_READ_tRNS_SUPPORTED | |
1417 PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr, | |
1418 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
1419 #endif | |
1420 | |
1421 #ifdef PNG_READ_zTXt_SUPPORTED | |
1422 PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr, | |
1423 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
1424 #endif | |
1425 | |
1426 PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_structrp png_ptr, | |
1427 png_uint_32 chunk_name),PNG_EMPTY); | |
1428 | |
1429 #ifdef PNG_READ_SUPPORTED | |
1430 PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr, | |
1431 png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY); | |
1432 /* This is the function that gets called for unknown chunks. The 'keep' | |
1433 * argument is either non-zero for a known chunk that has been set to be | |
1434 * handled as unknown or zero for an unknown chunk. By default the function | |
1435 * just skips the chunk or errors out if it is critical. | |
1436 */ | |
1437 | |
1438 #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED | |
1439 #ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED | |
1440 PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling, | |
1441 (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY); | |
1442 /* Exactly as the API png_handle_as_unknown() except that the argument is a | |
1443 * 32-bit chunk name, not a string. | |
1444 */ | |
1445 #endif | |
1446 #endif /* PNG_READ_UNKNOWN_CHUNKS_SUPPORTED */ | |
1447 #endif /* PNG_READ_SUPPORTED */ | |
1448 | |
1449 /* Handle the transformations for reading and writing */ | |
1450 #ifdef PNG_READ_TRANSFORMS_SUPPORTED | |
1451 PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr, | |
1452 png_row_infop row_info),PNG_EMPTY); | |
1453 #endif | |
1454 #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED | |
1455 PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr, | |
1456 png_row_infop row_info),PNG_EMPTY); | |
1457 #endif | |
1458 | |
1459 #ifdef PNG_READ_TRANSFORMS_SUPPORTED | |
1460 PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr), | |
1461 PNG_EMPTY); | |
1462 #endif | |
1463 | |
1464 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED | |
1465 PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr, | |
1466 png_inforp info_ptr),PNG_EMPTY); | |
1467 PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr, | |
1468 png_inforp info_ptr),PNG_EMPTY); | |
1469 PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY); | |
1470 PNG_INTERNAL_FUNCTION(void,png_push_crc_skip,(png_structrp png_ptr, | |
1471 png_uint_32 length),PNG_EMPTY); | |
1472 PNG_INTERNAL_FUNCTION(void,png_push_crc_finish,(png_structrp png_ptr), | |
1473 PNG_EMPTY); | |
1474 PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr), | |
1475 PNG_EMPTY); | |
1476 PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr, | |
1477 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); | |
1478 PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY); | |
1479 PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr, | |
1480 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); | |
1481 PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr), | |
1482 PNG_EMPTY); | |
1483 PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr, | |
1484 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
1485 PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr, | |
1486 png_inforp info_ptr),PNG_EMPTY); | |
1487 PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr, | |
1488 png_inforp info_ptr),PNG_EMPTY); | |
1489 PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr, | |
1490 png_bytep row),PNG_EMPTY); | |
1491 PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr, | |
1492 png_inforp info_ptr),PNG_EMPTY); | |
1493 PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr, | |
1494 png_inforp info_ptr),PNG_EMPTY); | |
1495 PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr), | |
1496 PNG_EMPTY); | |
1497 # ifdef PNG_READ_tEXt_SUPPORTED | |
1498 PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr, | |
1499 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
1500 PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr, | |
1501 png_inforp info_ptr),PNG_EMPTY); | |
1502 # endif | |
1503 # ifdef PNG_READ_zTXt_SUPPORTED | |
1504 PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr, | |
1505 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
1506 PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr, | |
1507 png_inforp info_ptr),PNG_EMPTY); | |
1508 # endif | |
1509 # ifdef PNG_READ_iTXt_SUPPORTED | |
1510 PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr, | |
1511 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
1512 PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr, | |
1513 png_inforp info_ptr),PNG_EMPTY); | |
1514 # endif | |
1515 | |
1516 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ | |
1517 | |
1518 #ifdef PNG_MNG_FEATURES_SUPPORTED | |
1519 PNG_INTERNAL_FUNCTION(void,png_do_read_intrapixel,(png_row_infop row_info, | |
1520 png_bytep row),PNG_EMPTY); | |
1521 PNG_INTERNAL_FUNCTION(void,png_do_write_intrapixel,(png_row_infop row_info, | |
1522 png_bytep row),PNG_EMPTY); | |
1523 #endif | |
1524 | |
1525 /* Added at libpng version 1.6.0 */ | |
1526 #ifdef PNG_GAMMA_SUPPORTED | |
1527 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr, | |
1528 png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY); | |
1529 /* Set the colorspace gamma with a value provided by the application or by | |
1530 * the gAMA chunk on read. The value will override anything set by an ICC | |
1531 * profile. | |
1532 */ | |
1533 | |
1534 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr, | |
1535 png_inforp info_ptr), PNG_EMPTY); | |
1536 /* Synchronize the info 'valid' flags with the colorspace */ | |
1537 | |
1538 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr, | |
1539 png_inforp info_ptr), PNG_EMPTY); | |
1540 /* Copy the png_struct colorspace to the info_struct and call the above to | |
1541 * synchronize the flags. Checks for NULL info_ptr and does nothing. | |
1542 */ | |
1543 #endif | |
1544 | |
1545 /* Added at libpng version 1.4.0 */ | |
1546 #ifdef PNG_COLORSPACE_SUPPORTED | |
1547 /* These internal functions are for maintaining the colorspace structure within | |
1548 * a png_info or png_struct (or, indeed, both). | |
1549 */ | |
1550 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities, | |
1551 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy, | |
1552 int preferred), PNG_EMPTY); | |
1553 | |
1554 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints, | |
1555 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ, | |
1556 int preferred), PNG_EMPTY); | |
1557 | |
1558 #ifdef PNG_sRGB_SUPPORTED | |
1559 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr, | |
1560 png_colorspacerp colorspace, int intent), PNG_EMPTY); | |
1561 /* This does set the colorspace gAMA and cHRM values too, but doesn't set the | |
1562 * flags to write them, if it returns false there was a problem and an error | |
1563 * message has already been output (but the colorspace may still need to be | |
1564 * synced to record the invalid flag). | |
1565 */ | |
1566 #endif /* sRGB */ | |
1567 | |
1568 #ifdef PNG_iCCP_SUPPORTED | |
1569 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr, | |
1570 png_colorspacerp colorspace, png_const_charp name, | |
1571 png_uint_32 profile_length, png_const_bytep profile, int color_type), | |
1572 PNG_EMPTY); | |
1573 /* The 'name' is used for information only */ | |
1574 | |
1575 /* Routines for checking parts of an ICC profile. */ | |
1576 PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr, | |
1577 png_colorspacerp colorspace, png_const_charp name, | |
1578 png_uint_32 profile_length), PNG_EMPTY); | |
1579 PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr, | |
1580 png_colorspacerp colorspace, png_const_charp name, | |
1581 png_uint_32 profile_length, | |
1582 png_const_bytep profile /* first 132 bytes only */, int color_type), | |
1583 PNG_EMPTY); | |
1584 PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr, | |
1585 png_colorspacerp colorspace, png_const_charp name, | |
1586 png_uint_32 profile_length, | |
1587 png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY); | |
1588 #ifdef PNG_sRGB_SUPPORTED | |
1589 PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,( | |
1590 png_const_structrp png_ptr, png_colorspacerp colorspace, | |
1591 png_const_bytep profile, uLong adler), PNG_EMPTY); | |
1592 /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may | |
1593 * be zero to indicate that it is not available. It is used, if provided, | |
1594 * as a fast check on the profile when checking to see if it is sRGB. | |
1595 */ | |
1596 #endif | |
1597 #endif /* iCCP */ | |
1598 | |
1599 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED | |
1600 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients, | |
1601 (png_structrp png_ptr), PNG_EMPTY); | |
1602 /* Set the rgb_to_gray coefficients from the colorspace Y values */ | |
1603 #endif /* READ_RGB_TO_GRAY */ | |
1604 #endif /* COLORSPACE */ | |
1605 | |
1606 /* Added at libpng version 1.4.0 */ | |
1607 PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr, | |
1608 png_uint_32 width, png_uint_32 height, int bit_depth, | |
1609 int color_type, int interlace_type, int compression_type, | |
1610 int filter_type),PNG_EMPTY); | |
1611 | |
1612 /* Added at libpng version 1.5.10 */ | |
1613 #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \ | |
1614 defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED) | |
1615 PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes, | |
1616 (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY); | |
1617 #endif | |
1618 | |
1619 #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) | |
1620 PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr, | |
1621 png_const_charp name),PNG_NORETURN); | |
1622 #endif | |
1623 | |
1624 /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite | |
1625 * the end. Always leaves the buffer nul terminated. Never errors out (and | |
1626 * there is no error code.) | |
1627 */ | |
1628 PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize, | |
1629 size_t pos, png_const_charp string),PNG_EMPTY); | |
1630 | |
1631 /* Various internal functions to handle formatted warning messages, currently | |
1632 * only implemented for warnings. | |
1633 */ | |
1634 #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) | |
1635 /* Utility to dump an unsigned value into a buffer, given a start pointer and | |
1636 * and end pointer (which should point just *beyond* the end of the buffer!) | |
1637 * Returns the pointer to the start of the formatted string. This utility only | |
1638 * does unsigned values. | |
1639 */ | |
1640 PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start, | |
1641 png_charp end, int format, png_alloc_size_t number),PNG_EMPTY); | |
1642 | |
1643 /* Convenience macro that takes an array: */ | |
1644 #define PNG_FORMAT_NUMBER(buffer,format,number) \ | |
1645 png_format_number(buffer, buffer + (sizeof buffer), format, number) | |
1646 | |
1647 /* Suggested size for a number buffer (enough for 64 bits and a sign!) */ | |
1648 #define PNG_NUMBER_BUFFER_SIZE 24 | |
1649 | |
1650 /* These are the integer formats currently supported, the name is formed from | |
1651 * the standard printf(3) format string. | |
1652 */ | |
1653 #define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */ | |
1654 #define PNG_NUMBER_FORMAT_02u 2 | |
1655 #define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */ | |
1656 #define PNG_NUMBER_FORMAT_02d 2 | |
1657 #define PNG_NUMBER_FORMAT_x 3 | |
1658 #define PNG_NUMBER_FORMAT_02x 4 | |
1659 #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */ | |
1660 #endif | |
1661 | |
1662 #ifdef PNG_WARNINGS_SUPPORTED | |
1663 /* New defines and members adding in libpng-1.5.4 */ | |
1664 # define PNG_WARNING_PARAMETER_SIZE 32 | |
1665 # define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */ | |
1666 | |
1667 /* An l-value of this type has to be passed to the APIs below to cache the | |
1668 * values of the parameters to a formatted warning message. | |
1669 */ | |
1670 typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][ | |
1671 PNG_WARNING_PARAMETER_SIZE]; | |
1672 | |
1673 PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p, | |
1674 int number, png_const_charp string),PNG_EMPTY); | |
1675 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters, | |
1676 * including the trailing '\0'. | |
1677 */ | |
1678 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned, | |
1679 (png_warning_parameters p, int number, int format, png_alloc_size_t value), | |
1680 PNG_EMPTY); | |
1681 /* Use png_alloc_size_t because it is an unsigned type as big as any we | |
1682 * need to output. Use the following for a signed value. | |
1683 */ | |
1684 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed, | |
1685 (png_warning_parameters p, int number, int format, png_int_32 value), | |
1686 PNG_EMPTY); | |
1687 | |
1688 PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr, | |
1689 png_warning_parameters p, png_const_charp message),PNG_EMPTY); | |
1690 /* 'message' follows the X/Open approach of using @1, @2 to insert | |
1691 * parameters previously supplied using the above functions. Errors in | |
1692 * specifying the parameters will simply result in garbage substitutions. | |
1693 */ | |
1694 #endif | |
1695 | |
1696 #ifdef PNG_BENIGN_ERRORS_SUPPORTED | |
1697 /* Application errors (new in 1.6); use these functions (declared below) for | |
1698 * errors in the parameters or order of API function calls on read. The | |
1699 * 'warning' should be used for an error that can be handled completely; the | |
1700 * 'error' for one which can be handled safely but which may lose application | |
1701 * information or settings. | |
1702 * | |
1703 * By default these both result in a png_error call prior to release, while in a | |
1704 * released version the 'warning' is just a warning. However if the application | |
1705 * explicitly disables benign errors (explicitly permitting the code to lose | |
1706 * information) they both turn into warnings. | |
1707 * | |
1708 * If benign errors aren't supported they end up as the corresponding base call | |
1709 * (png_warning or png_error.) | |
1710 */ | |
1711 PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr, | |
1712 png_const_charp message),PNG_EMPTY); | |
1713 /* The application provided invalid parameters to an API function or called | |
1714 * an API function at the wrong time, libpng can completely recover. | |
1715 */ | |
1716 | |
1717 PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr, | |
1718 png_const_charp message),PNG_EMPTY); | |
1719 /* As above but libpng will ignore the call, or attempt some other partial | |
1720 * recovery from the error. | |
1721 */ | |
1722 #else | |
1723 # define png_app_warning(pp,s) png_warning(pp,s) | |
1724 # define png_app_error(pp,s) png_error(pp,s) | |
1725 #endif | |
1726 | |
1727 PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr, | |
1728 png_const_charp message, int error),PNG_EMPTY); | |
1729 /* Report a recoverable issue in chunk data. On read this is used to report | |
1730 * a problem found while reading a particular chunk and the | |
1731 * png_chunk_benign_error or png_chunk_warning function is used as | |
1732 * appropriate. On write this is used to report an error that comes from | |
1733 * data set via an application call to a png_set_ API and png_app_error or | |
1734 * png_app_warning is used as appropriate. | |
1735 * | |
1736 * The 'error' parameter must have one of the following values: | |
1737 */ | |
1738 #define PNG_CHUNK_WARNING 0 /* never an error */ | |
1739 #define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */ | |
1740 #define PNG_CHUNK_ERROR 2 /* always an error */ | |
1741 | |
1742 /* ASCII to FP interfaces, currently only implemented if sCAL | |
1743 * support is required. | |
1744 */ | |
1745 #if defined(PNG_sCAL_SUPPORTED) | |
1746 /* MAX_DIGITS is actually the maximum number of characters in an sCAL | |
1747 * width or height, derived from the precision (number of significant | |
1748 * digits - a build time settable option) and assumptions about the | |
1749 * maximum ridiculous exponent. | |
1750 */ | |
1751 #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/) | |
1752 | |
1753 #ifdef PNG_FLOATING_POINT_SUPPORTED | |
1754 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr, | |
1755 png_charp ascii, png_size_t size, double fp, unsigned int precision), | |
1756 PNG_EMPTY); | |
1757 #endif /* FLOATING_POINT */ | |
1758 | |
1759 #ifdef PNG_FIXED_POINT_SUPPORTED | |
1760 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr, | |
1761 png_charp ascii, png_size_t size, png_fixed_point fp),PNG_EMPTY); | |
1762 #endif /* FIXED_POINT */ | |
1763 #endif /* sCAL */ | |
1764 | |
1765 #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) | |
1766 /* An internal API to validate the format of a floating point number. | |
1767 * The result is the index of the next character. If the number is | |
1768 * not valid it will be the index of a character in the supposed number. | |
1769 * | |
1770 * The format of a number is defined in the PNG extensions specification | |
1771 * and this API is strictly conformant to that spec, not anyone elses! | |
1772 * | |
1773 * The format as a regular expression is: | |
1774 * | |
1775 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)? | |
1776 * | |
1777 * or: | |
1778 * | |
1779 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)? | |
1780 * | |
1781 * The complexity is that either integer or fraction must be present and the | |
1782 * fraction is permitted to have no digits only if the integer is present. | |
1783 * | |
1784 * NOTE: The dangling E problem. | |
1785 * There is a PNG valid floating point number in the following: | |
1786 * | |
1787 * PNG floating point numbers are not greedy. | |
1788 * | |
1789 * Working this out requires *TWO* character lookahead (because of the | |
1790 * sign), the parser does not do this - it will fail at the 'r' - this | |
1791 * doesn't matter for PNG sCAL chunk values, but it requires more care | |
1792 * if the value were ever to be embedded in something more complex. Use | |
1793 * ANSI-C strtod if you need the lookahead. | |
1794 */ | |
1795 /* State table for the parser. */ | |
1796 #define PNG_FP_INTEGER 0 /* before or in integer */ | |
1797 #define PNG_FP_FRACTION 1 /* before or in fraction */ | |
1798 #define PNG_FP_EXPONENT 2 /* before or in exponent */ | |
1799 #define PNG_FP_STATE 3 /* mask for the above */ | |
1800 #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */ | |
1801 #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */ | |
1802 #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */ | |
1803 #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */ | |
1804 #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */ | |
1805 | |
1806 /* These three values don't affect the parser. They are set but not used. | |
1807 */ | |
1808 #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */ | |
1809 #define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */ | |
1810 #define PNG_FP_NONZERO 256 /* A non-zero value */ | |
1811 #define PNG_FP_STICKY 448 /* The above three flags */ | |
1812 | |
1813 /* This is available for the caller to store in 'state' if required. Do not | |
1814 * call the parser after setting it (the parser sometimes clears it.) | |
1815 */ | |
1816 #define PNG_FP_INVALID 512 /* Available for callers as a distinct value */ | |
1817 | |
1818 /* Result codes for the parser (boolean - true meants ok, false means | |
1819 * not ok yet.) | |
1820 */ | |
1821 #define PNG_FP_MAYBE 0 /* The number may be valid in the future */ | |
1822 #define PNG_FP_OK 1 /* The number is valid */ | |
1823 | |
1824 /* Tests on the sticky non-zero and negative flags. To pass these checks | |
1825 * the state must also indicate that the whole number is valid - this is | |
1826 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this | |
1827 * is equivalent to PNG_FP_OK above.) | |
1828 */ | |
1829 #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO) | |
1830 /* NZ_MASK: the string is valid and a non-zero negative value */ | |
1831 #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO) | |
1832 /* Z MASK: the string is valid and a non-zero value. */ | |
1833 /* PNG_FP_SAW_DIGIT: the string is valid. */ | |
1834 #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT) | |
1835 #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK) | |
1836 #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK) | |
1837 | |
1838 /* The actual parser. This can be called repeatedly. It updates | |
1839 * the index into the string and the state variable (which must | |
1840 * be initialized to 0). It returns a result code, as above. There | |
1841 * is no point calling the parser any more if it fails to advance to | |
1842 * the end of the string - it is stuck on an invalid character (or | |
1843 * terminated by '\0'). | |
1844 * | |
1845 * Note that the pointer will consume an E or even an E+ and then leave | |
1846 * a 'maybe' state even though a preceding integer.fraction is valid. | |
1847 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was | |
1848 * a valid number. It's possible to recover from this by calling | |
1849 * the parser again (from the start, with state 0) but with a string | |
1850 * that omits the last character (i.e. set the size to the index of | |
1851 * the problem character.) This has not been tested within libpng. | |
1852 */ | |
1853 PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string, | |
1854 png_size_t size, int *statep, png_size_tp whereami),PNG_EMPTY); | |
1855 | |
1856 /* This is the same but it checks a complete string and returns true | |
1857 * only if it just contains a floating point number. As of 1.5.4 this | |
1858 * function also returns the state at the end of parsing the number if | |
1859 * it was valid (otherwise it returns 0.) This can be used for testing | |
1860 * for negative or zero values using the sticky flag. | |
1861 */ | |
1862 PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string, | |
1863 png_size_t size),PNG_EMPTY); | |
1864 #endif /* pCAL || sCAL */ | |
1865 | |
1866 #if defined(PNG_READ_GAMMA_SUPPORTED) ||\ | |
1867 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED) | |
1868 /* Added at libpng version 1.5.0 */ | |
1869 /* This is a utility to provide a*times/div (rounded) and indicate | |
1870 * if there is an overflow. The result is a boolean - false (0) | |
1871 * for overflow, true (1) if no overflow, in which case *res | |
1872 * holds the result. | |
1873 */ | |
1874 PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a, | |
1875 png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY); | |
1876 #endif | |
1877 | |
1878 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED) | |
1879 /* Same deal, but issue a warning on overflow and return 0. */ | |
1880 PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn, | |
1881 (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by, | |
1882 png_int_32 divided_by),PNG_EMPTY); | |
1883 #endif | |
1884 | |
1885 #ifdef PNG_GAMMA_SUPPORTED | |
1886 /* Calculate a reciprocal - used for gamma values. This returns | |
1887 * 0 if the argument is 0 in order to maintain an undefined value; | |
1888 * there are no warnings. | |
1889 */ | |
1890 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a), | |
1891 PNG_EMPTY); | |
1892 | |
1893 #ifdef PNG_READ_GAMMA_SUPPORTED | |
1894 /* The same but gives a reciprocal of the product of two fixed point | |
1895 * values. Accuracy is suitable for gamma calculations but this is | |
1896 * not exact - use png_muldiv for that. Only required at present on read. | |
1897 */ | |
1898 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a, | |
1899 png_fixed_point b),PNG_EMPTY); | |
1900 #endif | |
1901 | |
1902 /* Return true if the gamma value is significantly different from 1.0 */ | |
1903 PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value), | |
1904 PNG_EMPTY); | |
1905 #endif | |
1906 | |
1907 #ifdef PNG_READ_GAMMA_SUPPORTED | |
1908 /* Internal fixed point gamma correction. These APIs are called as | |
1909 * required to convert single values - they don't need to be fast, | |
1910 * they are not used when processing image pixel values. | |
1911 * | |
1912 * While the input is an 'unsigned' value it must actually be the | |
1913 * correct bit value - 0..255 or 0..65535 as required. | |
1914 */ | |
1915 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr, | |
1916 unsigned int value, png_fixed_point gamma_value),PNG_EMPTY); | |
1917 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value, | |
1918 png_fixed_point gamma_value),PNG_EMPTY); | |
1919 PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value, | |
1920 png_fixed_point gamma_value),PNG_EMPTY); | |
1921 PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr), | |
1922 PNG_EMPTY); | |
1923 PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr, | |
1924 int bit_depth),PNG_EMPTY); | |
1925 #endif | |
1926 | |
1927 /* SIMPLIFIED READ/WRITE SUPPORT */ | |
1928 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ | |
1929 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) | |
1930 /* The internal structure that png_image::opaque points to. */ | |
1931 typedef struct png_control | |
1932 { | |
1933 png_structp png_ptr; | |
1934 png_infop info_ptr; | |
1935 png_voidp error_buf; /* Always a jmp_buf at present. */ | |
1936 | |
1937 png_const_bytep memory; /* Memory buffer. */ | |
1938 png_size_t size; /* Size of the memory buffer. */ | |
1939 | |
1940 unsigned int for_write :1; /* Otherwise it is a read structure */ | |
1941 unsigned int owned_file :1; /* We own the file in io_ptr */ | |
1942 } png_control; | |
1943 | |
1944 /* Return the pointer to the jmp_buf from a png_control: necessary because C | |
1945 * does not reveal the type of the elements of jmp_buf. | |
1946 */ | |
1947 #ifdef __cplusplus | |
1948 # define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0]) | |
1949 #else | |
1950 # define png_control_jmp_buf(pc) ((pc)->error_buf) | |
1951 #endif | |
1952 | |
1953 /* Utility to safely execute a piece of libpng code catching and logging any | |
1954 * errors that might occur. Returns true on success, false on failure (either | |
1955 * of the function or as a result of a png_error.) | |
1956 */ | |
1957 PNG_INTERNAL_FUNCTION(void,png_safe_error,(png_structp png_ptr, | |
1958 png_const_charp error_message),PNG_NORETURN); | |
1959 | |
1960 #ifdef PNG_WARNINGS_SUPPORTED | |
1961 PNG_INTERNAL_FUNCTION(void,png_safe_warning,(png_structp png_ptr, | |
1962 png_const_charp warning_message),PNG_EMPTY); | |
1963 #else | |
1964 # define png_safe_warning 0/*dummy argument*/ | |
1965 #endif | |
1966 | |
1967 PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image, | |
1968 int (*function)(png_voidp), png_voidp arg),PNG_EMPTY); | |
1969 | |
1970 /* Utility to log an error; this also cleans up the png_image; the function | |
1971 * always returns 0 (false). | |
1972 */ | |
1973 PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image, | |
1974 png_const_charp error_message),PNG_EMPTY); | |
1975 | |
1976 #ifndef PNG_SIMPLIFIED_READ_SUPPORTED | |
1977 /* png_image_free is used by the write code but not exported */ | |
1978 PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY); | |
1979 #endif /* !SIMPLIFIED_READ */ | |
1980 | |
1981 #endif /* SIMPLIFIED READ/WRITE */ | |
1982 | |
1983 /* These are initialization functions for hardware specific PNG filter | |
1984 * optimizations; list these here then select the appropriate one at compile | |
1985 * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined | |
1986 * the generic code is used. | |
1987 */ | |
1988 #ifdef PNG_FILTER_OPTIMIZATIONS | |
1989 PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr, | |
1990 unsigned int bpp), PNG_EMPTY); | |
1991 /* Just declare the optimization that will be used */ | |
1992 #else | |
1993 /* List *all* the possible optimizations here - this branch is required if | |
1994 * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in | |
1995 * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing. | |
1996 */ | |
1997 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon, | |
1998 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); | |
1999 #endif | |
2000 | |
2001 /* Maintainer: Put new private prototypes here ^ */ | |
2002 | |
2003 #include "pngdebug.h" | |
2004 | |
2005 #ifdef __cplusplus | |
2006 } | |
2007 #endif | |
2008 | |
2009 #endif /* PNG_VERSION_INFO_ONLY */ | |
2010 #endif /* PNGPRIV_H */ | |
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