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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) 1998-2011 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 1.5.7 [December 15, 2011]
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 PNG_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/* This is required for the definition of abort(), used as a last ditch
43 * error handler when all else fails.
44 */
45#include <stdlib.h>
46
47/* This is used to find 'offsetof', used below for alignment tests. */
48#include <stddef.h>
49
50#define PNGLIB_BUILD /*libpng is being built, not used*/
51
52#ifdef PNG_USER_CONFIG
53# include "pngusr.h"
54 /* These should have been defined in pngusr.h */
55# ifndef PNG_USER_PRIVATEBUILD
56# define PNG_USER_PRIVATEBUILD "Custom libpng build"
57# endif
58# ifndef PNG_USER_DLLFNAME_POSTFIX
59# define PNG_USER_DLLFNAME_POSTFIX "Cb"
60# endif
61#endif
62
63/* Is this a build of a DLL where compilation of the object modules requires
64 * different preprocessor settings to those required for a simple library? If
65 * so PNG_BUILD_DLL must be set.
66 *
67 * If libpng is used inside a DLL but that DLL does not export the libpng APIs
68 * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a
69 * static library of libpng then link the DLL against that.
70 */
71#ifndef PNG_BUILD_DLL
72# ifdef DLL_EXPORT
73 /* This is set by libtool when files are compiled for a DLL; libtool
74 * always compiles twice, even on systems where it isn't necessary. Set
75 * PNG_BUILD_DLL in case it is necessary:
76 */
77# define PNG_BUILD_DLL
78# else
79# ifdef _WINDLL
80 /* This is set by the Microsoft Visual Studio IDE in projects that
81 * build a DLL. It can't easily be removed from those projects (it
82 * isn't visible in the Visual Studio UI) so it is a fairly reliable
83 * indication that PNG_IMPEXP needs to be set to the DLL export
84 * attributes.
85 */
86# define PNG_BUILD_DLL
87# else
88# ifdef __DLL__
89 /* This is set by the Borland C system when compiling for a DLL
90 * (as above.)
91 */
92# define PNG_BUILD_DLL
93# else
94 /* Add additional compiler cases here. */
95# endif
96# endif
97# endif
98#endif /* Setting PNG_BUILD_DLL if required */
99
100/* See pngconf.h for more details: the builder of the library may set this on
101 * the command line to the right thing for the specific compilation system or it
102 * may be automagically set above (at present we know of no system where it does
103 * need to be set on the command line.)
104 *
105 * PNG_IMPEXP must be set here when building the library to prevent pngconf.h
106 * setting it to the "import" setting for a DLL build.
107 */
108#ifndef PNG_IMPEXP
109# ifdef PNG_BUILD_DLL
110# define PNG_IMPEXP PNG_DLL_EXPORT
111# else
112 /* Not building a DLL, or the DLL doesn't require specific export
113 * definitions.
114 */
115# define PNG_IMPEXP
116# endif
117#endif
118
119/* No warnings for private or deprecated functions in the build: */
120#ifndef PNG_DEPRECATED
121# define PNG_DEPRECATED
122#endif
123#ifndef PNG_PRIVATE
124# define PNG_PRIVATE
125#endif
126
127#include "png.h"
128#include "pnginfo.h"
129#include "pngstruct.h"
130
131/* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */
132#ifndef PNG_DLL_EXPORT
133# define PNG_DLL_EXPORT
134#endif
135
136/* This is used for 16 bit gamma tables - only the top level pointers are const,
137 * this could be changed:
138 */
139typedef PNG_CONST png_uint_16p FAR * png_const_uint_16pp;
140
141/* Added at libpng-1.2.9 */
142/* Moved to pngpriv.h at libpng-1.5.0 */
143
144/* config.h is created by and PNG_CONFIGURE_LIBPNG is set by the "configure"
145 * script. We may need it here to get the correct configuration on things
146 * like limits.
147 */
148#ifdef PNG_CONFIGURE_LIBPNG
149# ifdef HAVE_CONFIG_H
150# include "config.h"
151# endif
152#endif
153
154/* Moved to pngpriv.h at libpng-1.5.0 */
155/* NOTE: some of these may have been used in external applications as
156 * these definitions were exposed in pngconf.h prior to 1.5.
157 */
158
159/* If you are running on a machine where you cannot allocate more
160 * than 64K of memory at once, uncomment this. While libpng will not
161 * normally need that much memory in a chunk (unless you load up a very
162 * large file), zlib needs to know how big of a chunk it can use, and
163 * libpng thus makes sure to check any memory allocation to verify it
164 * will fit into memory.
165 *
166 * zlib provides 'MAXSEG_64K' which, if defined, indicates the
167 * same limit and pngconf.h (already included) sets the limit
168 * if certain operating systems are detected.
169 */
170#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
171# define PNG_MAX_MALLOC_64K
172#endif
173
174#ifndef PNG_UNUSED
175/* Unused formal parameter warnings are silenced using the following macro
176 * which is expected to have no bad effects on performance (optimizing
177 * compilers will probably remove it entirely). Note that if you replace
178 * it with something other than whitespace, you must include the terminating
179 * semicolon.
180 */
181# define PNG_UNUSED(param) (void)param;
182#endif
183
184/* Just a little check that someone hasn't tried to define something
185 * contradictory.
186 */
187#if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K)
188# undef PNG_ZBUF_SIZE
189# define PNG_ZBUF_SIZE 65536L
190#endif
191
192/* PNG_STATIC is used to mark internal file scope functions if they need to be
193 * accessed for implementation tests (see the code in tests/?*).
194 */
195#ifndef PNG_STATIC
196# define PNG_STATIC static
197#endif
198
199/* C99 restrict is used where possible, to do this 'restrict' is defined as
200 * empty if we can't be sure it is supported. configure builds have already
201 * done this work.
202 */
203#ifdef PNG_CONFIGURE_LIBPNG
204# define PNG_RESTRICT restrict
205#else
206 /* Modern compilers support restrict, but assume not for anything not
207 * recognized here:
208 */
209# if defined __GNUC__ || defined _MSC_VER || defined __WATCOMC__
210# define PNG_RESTRICT restrict
211# else
212# define PNG_RESTRICT
213# endif
214#endif
215
216/* If warnings or errors are turned off the code is disabled or redirected here.
217 * From 1.5.4 functions have been added to allow very limited formatting of
218 * error and warning messages - this code will also be disabled here.
219 */
220#ifdef PNG_WARNINGS_SUPPORTED
221# define PNG_WARNING_PARAMETERS(p) png_warning_parameters p;
222#else
223# define png_warning(s1,s2) ((void)(s1))
224# define png_chunk_warning(s1,s2) ((void)(s1))
225# define png_warning_parameter(p,number,string) ((void)0)
226# define png_warning_parameter_unsigned(p,number,format,value) ((void)0)
227# define png_warning_parameter_signed(p,number,format,value) ((void)0)
228# define png_formatted_warning(pp,p,message) ((void)(pp))
229# define PNG_WARNING_PARAMETERS(p)
230#endif
231#ifndef PNG_ERROR_TEXT_SUPPORTED
232# define png_error(s1,s2) png_err(s1)
233# define png_chunk_error(s1,s2) png_err(s1)
234# define png_fixed_error(s1,s2) png_err(s1)
235#endif
236
237/* C allows up-casts from (void*) to any pointer and (const void*) to any
238 * pointer to a const object. C++ regards this as a type error and requires an
239 * explicit, static, cast and provides the static_cast<> rune to ensure that
240 * const is not cast away.
241 */
242#ifdef __cplusplus
243# define png_voidcast(type, value) static_cast<type>(value)
244#else
245# define png_voidcast(type, value) (value)
246#endif /* __cplusplus */
247
248#ifndef PNG_EXTERN
249/* The functions exported by PNG_EXTERN are internal functions, which
250 * aren't usually used outside the library (as far as I know), so it is
251 * debatable if they should be exported at all. In the future, when it
252 * is possible to have run-time registry of chunk-handling functions,
253 * some of these might be made available again.
254 *
255 * 1.5.7: turned the use of 'extern' back on, since it is localized to pngpriv.h
256 * it should be safe now (it is unclear why it was turned off.)
257 */
258# define PNG_EXTERN extern
259#endif
260
261/* Some fixed point APIs are still required even if not exported because
262 * they get used by the corresponding floating point APIs. This magic
263 * deals with this:
264 */
265#ifdef PNG_FIXED_POINT_SUPPORTED
266# define PNGFAPI PNGAPI
267#else
268# define PNGFAPI /* PRIVATE */
269#endif
270
271/* Other defines specific to compilers can go here. Try to keep
272 * them inside an appropriate ifdef/endif pair for portability.
273 */
274#if defined(PNG_FLOATING_POINT_SUPPORTED) ||\
275 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
276 /* png.c requires the following ANSI-C constants if the conversion of
277 * floating point to ASCII is implemented therein:
278 *
279 * DBL_DIG Maximum number of decimal digits (can be set to any constant)
280 * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value)
281 * DBL_MAX Maximum floating point number (can be set to an arbitrary value)
282 */
283# include <float.h>
284
285# if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
286 defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
287 /* We need to check that <math.h> hasn't already been included earlier
288 * as it seems it doesn't agree with <fp.h>, yet we should really use
289 * <fp.h> if possible.
290 */
291# if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
292# include <fp.h>
293# endif
294# else
295# include <math.h>
296# endif
297# if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
298 /* Amiga SAS/C: We must include builtin FPU functions when compiling using
299 * MATH=68881
300 */
301# include <m68881.h>
302# endif
303#endif
304
305/* This provides the non-ANSI (far) memory allocation routines. */
306#if defined(__TURBOC__) && defined(__MSDOS__)
307# include <mem.h>
308# include <alloc.h>
309#endif
310
311#if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \
312 defined(_WIN32) || defined(__WIN32__)
313# include <windows.h> /* defines _WINDOWS_ macro */
314#endif
315
316/* Moved here around 1.5.0beta36 from pngconf.h */
317/* Users may want to use these so they are not private. Any library
318 * functions that are passed far data must be model-independent.
319 */
320
321/* Memory model/platform independent fns */
322#ifndef PNG_ABORT
323# ifdef _WINDOWS_
324# define PNG_ABORT() ExitProcess(0)
325# else
326# define PNG_ABORT() abort()
327# endif
328#endif
329
330#ifdef USE_FAR_KEYWORD
331/* Use this to make far-to-near assignments */
332# define CHECK 1
333# define NOCHECK 0
334# define CVT_PTR(ptr) (png_far_to_near(png_ptr,ptr,CHECK))
335# define CVT_PTR_NOCHECK(ptr) (png_far_to_near(png_ptr,ptr,NOCHECK))
336# define png_strlen _fstrlen
337# define png_memcmp _fmemcmp /* SJT: added */
338# define png_memcpy _fmemcpy
339# define png_memset _fmemset
340#else
341# ifdef _WINDOWS_ /* Favor Windows over C runtime fns */
342# define CVT_PTR(ptr) (ptr)
343# define CVT_PTR_NOCHECK(ptr) (ptr)
344# define png_strlen lstrlenA
345# define png_memcmp memcmp
346# define png_memcpy CopyMemory
347# define png_memset memset
348# else
349# define CVT_PTR(ptr) (ptr)
350# define CVT_PTR_NOCHECK(ptr) (ptr)
351# define png_strlen strlen
352# define png_memcmp memcmp /* SJT: added */
353# define png_memcpy memcpy
354# define png_memset memset
355# endif
356#endif
357
358/* These macros may need to be architecture dependent. */
359#define PNG_ALIGN_NONE 0 /* do not use data alignment */
360#define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */
361#ifdef offsetof
362# define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */
363#else
364# define PNG_ALIGN_OFFSET -1 /* prevent the use of this */
365#endif
366#define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */
367
368#ifndef PNG_ALIGN_TYPE
369 /* Default to using aligned access optimizations and requiring alignment to a
370 * multiple of the data type size. Override in a compiler specific fashion
371 * if necessary by inserting tests here:
372 */
373# define PNG_ALIGN_TYPE PNG_ALIGN_SIZE
374#endif
375
376#if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE
377 /* This is used because in some compiler implementations non-aligned
378 * structure members are supported, so the offsetof approach below fails.
379 * Set PNG_ALIGN_TO_SIZE=0 for compiler combinations where unaligned access
380 * is good for performance. Do not do this unless you have tested the result
381 * and understand it.
382 */
383# define png_alignof(type) (sizeof (type))
384#else
385# if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET
386# define png_alignof(type) offsetof(struct{char c; type t;}, t)
387# else
388# if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS
389# define png_alignof(type) (1)
390# endif
391 /* Else leave png_alignof undefined to prevent use thereof */
392# endif
393#endif
394
395/* This implicitly assumes alignment is always to a power of 2. */
396#ifdef png_alignof
397# define png_isaligned(ptr, type)\
398 ((((const char*)ptr-(const char*)0) & (png_alignof(type)-1)) == 0)
399#else
400# define png_isaligned(ptr, type) 0
401#endif
402
403/* End of memory model/platform independent support */
404/* End of 1.5.0beta36 move from pngconf.h */
405
406/* CONSTANTS and UTILITY MACROS
407 * These are used internally by libpng and not exposed in the API
408 */
409
410/* Various modes of operation. Note that after an init, mode is set to
411 * zero automatically when the structure is created. Three of these
412 * are defined in png.h because they need to be visible to applications
413 * that call png_set_unknown_chunk().
414 */
415/* #define PNG_HAVE_IHDR 0x01 (defined in png.h) */
416/* #define PNG_HAVE_PLTE 0x02 (defined in png.h) */
417#define PNG_HAVE_IDAT 0x04
418/* #define PNG_AFTER_IDAT 0x08 (defined in png.h) */
419#define PNG_HAVE_IEND 0x10
420#define PNG_HAVE_gAMA 0x20
421#define PNG_HAVE_cHRM 0x40
422#define PNG_HAVE_sRGB 0x80
423#define PNG_HAVE_CHUNK_HEADER 0x100
424#define PNG_WROTE_tIME 0x200
425#define PNG_WROTE_INFO_BEFORE_PLTE 0x400
426#define PNG_BACKGROUND_IS_GRAY 0x800
427#define PNG_HAVE_PNG_SIGNATURE 0x1000
428#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
429
430/* Flags for the transformations the PNG library does on the image data */
431#define PNG_BGR 0x0001
432#define PNG_INTERLACE 0x0002
433#define PNG_PACK 0x0004
434#define PNG_SHIFT 0x0008
435#define PNG_SWAP_BYTES 0x0010
436#define PNG_INVERT_MONO 0x0020
437#define PNG_QUANTIZE 0x0040
438#define PNG_COMPOSE 0x0080 /* Was PNG_BACKGROUND */
439#define PNG_BACKGROUND_EXPAND 0x0100
440#define PNG_EXPAND_16 0x0200 /* Added to libpng 1.5.2 */
441#define PNG_16_TO_8 0x0400 /* Becomes 'chop' in 1.5.4 */
442#define PNG_RGBA 0x0800
443#define PNG_EXPAND 0x1000
444#define PNG_GAMMA 0x2000
445#define PNG_GRAY_TO_RGB 0x4000
446#define PNG_FILLER 0x8000
447#define PNG_PACKSWAP 0x10000
448#define PNG_SWAP_ALPHA 0x20000
449#define PNG_STRIP_ALPHA 0x40000
450#define PNG_INVERT_ALPHA 0x80000
451#define PNG_USER_TRANSFORM 0x100000
452#define PNG_RGB_TO_GRAY_ERR 0x200000
453#define PNG_RGB_TO_GRAY_WARN 0x400000
454#define PNG_RGB_TO_GRAY 0x600000 /* two bits, RGB_TO_GRAY_ERR|WARN */
455#define PNG_ENCODE_ALPHA 0x800000 /* Added to libpng-1.5.4 */
456#define PNG_ADD_ALPHA 0x1000000 /* Added to libpng-1.2.7 */
457#define PNG_EXPAND_tRNS 0x2000000 /* Added to libpng-1.2.9 */
458#define PNG_SCALE_16_TO_8 0x4000000 /* Added to libpng-1.5.4 */
459 /* 0x8000000 unused */
460 /* 0x10000000 unused */
461 /* 0x20000000 unused */
462 /* 0x40000000 unused */
463/* Flags for png_create_struct */
464#define PNG_STRUCT_PNG 0x0001
465#define PNG_STRUCT_INFO 0x0002
466
467/* Scaling factor for filter heuristic weighting calculations */
468#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
469#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
470
471/* Flags for the png_ptr->flags rather than declaring a byte for each one */
472#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
473#define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002
474#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004
475#define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008
476#define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010
477#define PNG_FLAG_ZLIB_FINISHED 0x0020
478#define PNG_FLAG_ROW_INIT 0x0040
479#define PNG_FLAG_FILLER_AFTER 0x0080
480#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
481#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
482#define PNG_FLAG_CRC_CRITICAL_USE 0x0400
483#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
484#define PNG_FLAG_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.4 */
485#define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.4 */
486#define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.4 */
487#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000
488#define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000
489#define PNG_FLAG_LIBRARY_MISMATCH 0x20000
490#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000
491#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000
492#define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000
493 /* 0x200000 unused */
494 /* 0x400000 unused */
495#define PNG_FLAG_BENIGN_ERRORS_WARN 0x800000 /* Added to libpng-1.4.0 */
496#define PNG_FLAG_ZTXT_CUSTOM_STRATEGY 0x1000000 /* 5 lines added */
497#define PNG_FLAG_ZTXT_CUSTOM_LEVEL 0x2000000 /* to libpng-1.5.4 */
498#define PNG_FLAG_ZTXT_CUSTOM_MEM_LEVEL 0x4000000
499#define PNG_FLAG_ZTXT_CUSTOM_WINDOW_BITS 0x8000000
500#define PNG_FLAG_ZTXT_CUSTOM_METHOD 0x10000000
501 /* 0x20000000 unused */
502 /* 0x40000000 unused */
503
504#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
505 PNG_FLAG_CRC_ANCILLARY_NOWARN)
506
507#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
508 PNG_FLAG_CRC_CRITICAL_IGNORE)
509
510#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
511 PNG_FLAG_CRC_CRITICAL_MASK)
512
513/* zlib.h declares a magic type 'uInt' that limits the amount of data that zlib
514 * can handle at once. This type need be no larger than 16 bits (so maximum of
515 * 65535), this define allows us to discover how big it is, but limited by the
516 * maximuum for png_size_t. The value can be overriden in a library build
517 * (pngusr.h, or set it in CPPFLAGS) and it works to set it to a considerably
518 * lower value (e.g. 255 works). A lower value may help memory usage (slightly)
519 * and may even improve performance on some systems (and degrade it on others.)
520 */
521#ifndef ZLIB_IO_MAX
522# define ZLIB_IO_MAX ((uInt)-1)
523#endif
524
525/* Save typing and make code easier to understand */
526
527#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
528 abs((int)((c1).green) - (int)((c2).green)) + \
529 abs((int)((c1).blue) - (int)((c2).blue)))
530
531/* Added to libpng-1.2.6 JB */
532#define PNG_ROWBYTES(pixel_bits, width) \
533 ((pixel_bits) >= 8 ? \
534 ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \
535 (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) )
536
537/* PNG_OUT_OF_RANGE returns true if value is outside the range
538 * ideal-delta..ideal+delta. Each argument is evaluated twice.
539 * "ideal" and "delta" should be constants, normally simple
540 * integers, "value" a variable. Added to libpng-1.2.6 JB
541 */
542#define PNG_OUT_OF_RANGE(value, ideal, delta) \
543 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
544
545/* Conversions between fixed and floating point, only defined if
546 * required (to make sure the code doesn't accidentally use float
547 * when it is supposedly disabled.)
548 */
549#ifdef PNG_FLOATING_POINT_SUPPORTED
550/* The floating point conversion can't overflow, though it can and
551 * does lose accuracy relative to the original fixed point value.
552 * In practice this doesn't matter because png_fixed_point only
553 * stores numbers with very low precision. The png_ptr and s
554 * arguments are unused by default but are there in case error
555 * checking becomes a requirement.
556 */
557#define png_float(png_ptr, fixed, s) (.00001 * (fixed))
558
559/* The fixed point conversion performs range checking and evaluates
560 * its argument multiple times, so must be used with care. The
561 * range checking uses the PNG specification values for a signed
562 * 32 bit fixed point value except that the values are deliberately
563 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly
564 * (2^31-1) * 100000). 's' is a string that describes the value being
565 * converted.
566 *
567 * NOTE: this macro will raise a png_error if the range check fails,
568 * therefore it is normally only appropriate to use this on values
569 * that come from API calls or other sources where an out of range
570 * error indicates a programming error, not a data error!
571 *
572 * NOTE: by default this is off - the macro is not used - because the
573 * function call saves a lot of code.
574 */
575#ifdef PNG_FIXED_POINT_MACRO_SUPPORTED
576#define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\
577 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0))
578#else
579PNG_EXTERN png_fixed_point png_fixed PNGARG((png_structp png_ptr, double fp,
580 png_const_charp text));
581#endif
582#endif
583
584/* Constants for known chunk types. If you need to add a chunk, define the name
585 * here. For historical reasons these constants have the form png_<name>; i.e.
586 * the prefix is lower case. Please use decimal values as the parameters to
587 * match the ISO PNG specification and to avoid relying on the C locale
588 * interpretation of character values.
589 *
590 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values
591 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string
592 * to be generated if required.
593 *
594 * PNG_32b correctly produces a value shifted by up to 24 bits, even on
595 * architectures where (int) is only 16 bits.
596 */
597#define PNG_32b(b,s) ((png_uint_32)(b) << (s))
598#define PNG_CHUNK(b1,b2,b3,b4) \
599 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0))
600
601#define png_IHDR PNG_CHUNK( 73, 72, 68, 82)
602#define png_IDAT PNG_CHUNK( 73, 68, 65, 84)
603#define png_IEND PNG_CHUNK( 73, 69, 78, 68)
604#define png_PLTE PNG_CHUNK( 80, 76, 84, 69)
605#define png_bKGD PNG_CHUNK( 98, 75, 71, 68)
606#define png_cHRM PNG_CHUNK( 99, 72, 82, 77)
607#define png_gAMA PNG_CHUNK(103, 65, 77, 65)
608#define png_hIST PNG_CHUNK(104, 73, 83, 84)
609#define png_iCCP PNG_CHUNK(105, 67, 67, 80)
610#define png_iTXt PNG_CHUNK(105, 84, 88, 116)
611#define png_oFFs PNG_CHUNK(111, 70, 70, 115)
612#define png_pCAL PNG_CHUNK(112, 67, 65, 76)
613#define png_sCAL PNG_CHUNK(115, 67, 65, 76)
614#define png_pHYs PNG_CHUNK(112, 72, 89, 115)
615#define png_sBIT PNG_CHUNK(115, 66, 73, 84)
616#define png_sPLT PNG_CHUNK(115, 80, 76, 84)
617#define png_sRGB PNG_CHUNK(115, 82, 71, 66)
618#define png_sTER PNG_CHUNK(115, 84, 69, 82)
619#define png_tEXt PNG_CHUNK(116, 69, 88, 116)
620#define png_tIME PNG_CHUNK(116, 73, 77, 69)
621#define png_tRNS PNG_CHUNK(116, 82, 78, 83)
622#define png_zTXt PNG_CHUNK(122, 84, 88, 116)
623
624/* The following will work on (signed char*) strings, whereas the get_uint_32
625 * macro will fail on top-bit-set values because of the sign extension.
626 */
627#define PNG_CHUNK_FROM_STRING(s)\
628 PNG_CHUNK(0xff&(s)[0], 0xff&(s)[1], 0xff&(s)[2], 0xff&(s)[3])
629
630/* This uses (char), not (png_byte) to avoid warnings on systems where (char) is
631 * signed and the argument is a (char[]) This macro will fail miserably on
632 * systems where (char) is more than 8 bits.
633 */
634#define PNG_STRING_FROM_CHUNK(s,c)\
635 (void)(((char*)(s))[0]=(char)((c)>>24), ((char*)(s))[1]=(char)((c)>>16),\
636 ((char*)(s))[2]=(char)((c)>>8), ((char*)(s))[3]=(char)((c)))
637
638/* Do the same but terminate with a null character. */
639#define PNG_CSTRING_FROM_CHUNK(s,c)\
640 (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0)
641
642/* Test on flag values as defined in the spec (section 5.4): */
643#define PNG_CHUNK_ANCILLIARY(c) (1 & ((c) >> 29))
644#define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLIARY(c))
645#define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21))
646#define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13))
647#define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5))
648
649/* Gamma values (new at libpng-1.5.4): */
650#define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */
651#define PNG_GAMMA_MAC_INVERSE 65909
652#define PNG_GAMMA_sRGB_INVERSE 45455
653
654
655/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
656#ifdef __cplusplus
657extern "C" {
658#endif /* __cplusplus */
659
660/* These functions are used internally in the code. They generally
661 * shouldn't be used unless you are writing code to add or replace some
662 * functionality in libpng. More information about most functions can
663 * be found in the files where the functions are located.
664 */
665
666/* Check the user version string for compatibility, returns false if the version
667 * numbers aren't compatible.
668 */
669PNG_EXTERN int png_user_version_check(png_structp png_ptr,
670 png_const_charp user_png_ver);
671
672/* Allocate memory for an internal libpng struct */
673PNG_EXTERN PNG_FUNCTION(png_voidp,png_create_struct,PNGARG((int type)),
674 PNG_ALLOCATED);
675
676/* Free memory from internal libpng struct */
677PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));
678
679PNG_EXTERN PNG_FUNCTION(png_voidp,png_create_struct_2,
680 PNGARG((int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)),
681 PNG_ALLOCATED);
682PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
683 png_free_ptr free_fn, png_voidp mem_ptr));
684
685/* Free any memory that info_ptr points to and reset struct. */
686PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
687 png_infop info_ptr));
688
689/* Function to allocate memory for zlib. PNGAPI is disallowed. */
690PNG_EXTERN PNG_FUNCTION(voidpf,png_zalloc,PNGARG((voidpf png_ptr, uInt items,
691 uInt size)),PNG_ALLOCATED);
692
693/* Function to free memory for zlib. PNGAPI is disallowed. */
694PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
695
696/* Next four functions are used internally as callbacks. PNGCBAPI is required
697 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to
698 * PNGCBAPI at 1.5.0
699 */
700
701PNG_EXTERN void PNGCBAPI png_default_read_data PNGARG((png_structp png_ptr,
702 png_bytep data, png_size_t length));
703
704#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
705PNG_EXTERN void PNGCBAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
706 png_bytep buffer, png_size_t length));
707#endif
708
709PNG_EXTERN void PNGCBAPI png_default_write_data PNGARG((png_structp png_ptr,
710 png_bytep data, png_size_t length));
711
712#ifdef PNG_WRITE_FLUSH_SUPPORTED
713# ifdef PNG_STDIO_SUPPORTED
714PNG_EXTERN void PNGCBAPI png_default_flush PNGARG((png_structp png_ptr));
715# endif
716#endif
717
718/* Reset the CRC variable */
719PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));
720
721/* Write the "data" buffer to whatever output you are using */
722PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr,
723 png_const_bytep data, png_size_t length));
724
725/* Read and check the PNG file signature */
726PNG_EXTERN void png_read_sig PNGARG((png_structp png_ptr, png_infop info_ptr));
727
728/* Read the chunk header (length + type name) */
729PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr));
730
731/* Read data from whatever input you are using into the "data" buffer */
732PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
733 png_size_t length));
734
735/* Read bytes into buf, and update png_ptr->crc */
736PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
737 png_size_t length));
738
739/* Decompress data in a chunk that uses compression */
740#if defined(PNG_READ_COMPRESSED_TEXT_SUPPORTED)
741PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,
742 int comp_type, png_size_t chunklength, png_size_t prefix_length,
743 png_size_t *data_length));
744#endif
745
746/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
747PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));
748
749/* Read the CRC from the file and compare it to the libpng calculated CRC */
750PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));
751
752/* Calculate the CRC over a section of data. Note that we are only
753 * passing a maximum of 64K on systems that have this as a memory limit,
754 * since this is the maximum buffer size we can specify.
755 */
756PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr,
757 png_const_bytep ptr, png_size_t length));
758
759#ifdef PNG_WRITE_FLUSH_SUPPORTED
760PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
761#endif
762
763/* Write various chunks */
764
765/* Write the IHDR chunk, and update the png_struct with the necessary
766 * information.
767 */
768PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
769 png_uint_32 height,
770 int bit_depth, int color_type, int compression_method, int filter_method,
771 int interlace_method));
772
773PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr,
774 png_const_colorp palette, png_uint_32 num_pal));
775
776PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
777 png_size_t length));
778
779PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));
780
781#ifdef PNG_WRITE_gAMA_SUPPORTED
782# ifdef PNG_FLOATING_POINT_SUPPORTED
783PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
784# endif
785# ifdef PNG_FIXED_POINT_SUPPORTED
786PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr,
787 png_fixed_point file_gamma));
788# endif
789#endif
790
791#ifdef PNG_WRITE_sBIT_SUPPORTED
792PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr,
793 png_const_color_8p sbit, int color_type));
794#endif
795
796#ifdef PNG_WRITE_cHRM_SUPPORTED
797# ifdef PNG_FLOATING_POINT_SUPPORTED
798PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
799 double white_x, double white_y,
800 double red_x, double red_y, double green_x, double green_y,
801 double blue_x, double blue_y));
802# endif
803PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
804 png_fixed_point int_white_x, png_fixed_point int_white_y,
805 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
806 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
807 png_fixed_point int_blue_y));
808#endif
809
810#ifdef PNG_WRITE_sRGB_SUPPORTED
811PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
812 int intent));
813#endif
814
815#ifdef PNG_WRITE_iCCP_SUPPORTED
816PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
817 png_const_charp name, int compression_type,
818 png_const_charp profile, int proflen));
819 /* Note to maintainer: profile should be png_bytep */
820#endif
821
822#ifdef PNG_WRITE_sPLT_SUPPORTED
823PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
824 png_const_sPLT_tp palette));
825#endif
826
827#ifdef PNG_WRITE_tRNS_SUPPORTED
828PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr,
829 png_const_bytep trans, png_const_color_16p values, int number,
830 int color_type));
831#endif
832
833#ifdef PNG_WRITE_bKGD_SUPPORTED
834PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
835 png_const_color_16p values, int color_type));
836#endif
837
838#ifdef PNG_WRITE_hIST_SUPPORTED
839PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr,
840 png_const_uint_16p hist, int num_hist));
841#endif
842
843/* Chunks that have keywords */
844#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
845 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
846PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
847 png_const_charp key, png_charpp new_key));
848#endif
849
850#ifdef PNG_WRITE_tEXt_SUPPORTED
851PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_const_charp key,
852 png_const_charp text, png_size_t text_len));
853#endif
854
855#ifdef PNG_WRITE_zTXt_SUPPORTED
856PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_const_charp key,
857 png_const_charp text, png_size_t text_len, int compression));
858#endif
859
860#ifdef PNG_WRITE_iTXt_SUPPORTED
861PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
862 int compression, png_const_charp key, png_const_charp lang,
863 png_const_charp lang_key, png_const_charp text));
864#endif
865
866#ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */
867PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
868 png_infop info_ptr, png_const_textp text_ptr, int num_text));
869#endif
870
871#ifdef PNG_WRITE_oFFs_SUPPORTED
872PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
873 png_int_32 x_offset, png_int_32 y_offset, int unit_type));
874#endif
875
876#ifdef PNG_WRITE_pCAL_SUPPORTED
877PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
878 png_int_32 X0, png_int_32 X1, int type, int nparams,
879 png_const_charp units, png_charpp params));
880#endif
881
882#ifdef PNG_WRITE_pHYs_SUPPORTED
883PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
884 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
885 int unit_type));
886#endif
887
888#ifdef PNG_WRITE_tIME_SUPPORTED
889PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
890 png_const_timep mod_time));
891#endif
892
893#ifdef PNG_WRITE_sCAL_SUPPORTED
894PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
895 int unit, png_const_charp width, png_const_charp height));
896#endif
897
898/* Called when finished processing a row of data */
899PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
900
901/* Internal use only. Called before first row of data */
902PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));
903
904/* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an
905 * array of png_ptr->width pixels. If the image is not interlaced or this
906 * is the final pass this just does a png_memcpy, otherwise the "display" flag
907 * is used to determine whether to copy pixels that are not in the current pass.
908 *
909 * Because 'png_do_read_interlace' (below) replicates pixels this allows this
910 * function to achieve the documented 'blocky' appearance during interlaced read
911 * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row'
912 * are not changed if they are not in the current pass, when display is 0.
913 *
914 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless.
915 *
916 * The API always reads from the png_struct row buffer and always assumes that
917 * it is full width (png_do_read_interlace has already been called.)
918 *
919 * This function is only ever used to write to row buffers provided by the
920 * caller of the relevant libpng API and the row must have already been
921 * transformed by the read transformations.
922 *
923 * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed
924 * bitmasks for use within the code, otherwise runtime generated masks are used.
925 * The default is compile time masks.
926 */
927#ifndef PNG_USE_COMPILE_TIME_MASKS
928# define PNG_USE_COMPILE_TIME_MASKS 1
929#endif
930PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
931 int display));
932
933#ifdef PNG_READ_INTERLACING_SUPPORTED
934/* Expand an interlaced row: the 'row_info' describes the pass data that has
935 * been read in and must correspond to the pixels in 'row', the pixels are
936 * expanded (moved apart) in 'row' to match the final layout, when doing this
937 * the pixels are *replicated* to the intervening space. This is essential for
938 * the correct operation of png_combine_row, above.
939 */
940PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
941 png_bytep row, int pass, png_uint_32 transformations));
942#endif
943
944/* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
945
946#ifdef PNG_WRITE_INTERLACING_SUPPORTED
947/* Grab pixels out of a row for an interlaced pass */
948PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
949 png_bytep row, int pass));
950#endif
951
952/* Unfilter a row: check the filter value before calling this, there is no point
953 * calling it for PNG_FILTER_VALUE_NONE.
954 */
955PNG_EXTERN void png_read_filter_row PNGARG((png_structp pp, png_row_infop row_info,
956 png_bytep row, png_const_bytep prev_row, int filter));
957
958PNG_EXTERN void png_read_filter_row_up_neon PNGARG((png_row_infop row_info,
959 png_bytep row, png_const_bytep prev_row));
960PNG_EXTERN void png_read_filter_row_sub3_neon PNGARG((png_row_infop row_info,
961 png_bytep row, png_const_bytep prev_row));
962PNG_EXTERN void png_read_filter_row_sub4_neon PNGARG((png_row_infop row_info,
963 png_bytep row, png_const_bytep prev_row));
964PNG_EXTERN void png_read_filter_row_avg3_neon PNGARG((png_row_infop row_info,
965 png_bytep row, png_const_bytep prev_row));
966PNG_EXTERN void png_read_filter_row_avg4_neon PNGARG((png_row_infop row_info,
967 png_bytep row, png_const_bytep prev_row));
968PNG_EXTERN void png_read_filter_row_paeth3_neon PNGARG((png_row_infop row_info,
969 png_bytep row, png_const_bytep prev_row));
970PNG_EXTERN void png_read_filter_row_paeth4_neon PNGARG((png_row_infop row_info,
971 png_bytep row, png_const_bytep prev_row));
972
973/* Choose the best filter to use and filter the row data */
974PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
975 png_row_infop row_info));
976
977/* Finish a row while reading, dealing with interlacing passes, etc. */
978PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
979
980/* Initialize the row buffers, etc. */
981PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
982
983#ifdef PNG_READ_TRANSFORMS_SUPPORTED
984/* Optional call to update the users info structure */
985PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
986 png_infop info_ptr));
987#endif
988
989/* These are the functions that do the transformations */
990#ifdef PNG_READ_FILLER_SUPPORTED
991PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
992 png_bytep row, png_uint_32 filler, png_uint_32 flags));
993#endif
994
995#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
996PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
997 png_bytep row));
998#endif
999
1000#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
1001PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
1002 png_bytep row));
1003#endif
1004
1005#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
1006PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
1007 png_bytep row));
1008#endif
1009
1010#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
1011PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
1012 png_bytep row));
1013#endif
1014
1015#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
1016 defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
1017PNG_EXTERN void png_do_strip_channel PNGARG((png_row_infop row_info,
1018 png_bytep row, int at_start));
1019#endif
1020
1021#ifdef PNG_16BIT_SUPPORTED
1022#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
1023PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info,
1024 png_bytep row));
1025#endif
1026#endif
1027
1028#if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
1029 defined(PNG_WRITE_PACKSWAP_SUPPORTED)
1030PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info,
1031 png_bytep row));
1032#endif
1033
1034#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
1035PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr,
1036 png_row_infop row_info, png_bytep row));
1037#endif
1038
1039#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
1040PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
1041 png_bytep row));
1042#endif
1043
1044#ifdef PNG_READ_PACK_SUPPORTED
1045PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info,
1046 png_bytep row));
1047#endif
1048
1049#ifdef PNG_READ_SHIFT_SUPPORTED
1050PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info,
1051 png_bytep row, png_const_color_8p sig_bits));
1052#endif
1053
1054#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
1055PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info,
1056 png_bytep row));
1057#endif
1058
1059#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
1060PNG_EXTERN void png_do_scale_16_to_8 PNGARG((png_row_infop row_info,
1061 png_bytep row));
1062#endif
1063
1064#ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED
1065PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info,
1066 png_bytep row));
1067#endif
1068
1069#ifdef PNG_READ_QUANTIZE_SUPPORTED
1070PNG_EXTERN void png_do_quantize PNGARG((png_row_infop row_info,
1071 png_bytep row, png_const_bytep palette_lookup,
1072 png_const_bytep quantize_lookup));
1073
1074# ifdef PNG_CORRECT_PALETTE_SUPPORTED
1075PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
1076 png_colorp palette, int num_palette));
1077# endif
1078#endif
1079
1080#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
1081PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info,
1082 png_bytep row));
1083#endif
1084
1085#ifdef PNG_WRITE_PACK_SUPPORTED
1086PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
1087 png_bytep row, png_uint_32 bit_depth));
1088#endif
1089
1090#ifdef PNG_WRITE_SHIFT_SUPPORTED
1091PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info,
1092 png_bytep row, png_const_color_8p bit_depth));
1093#endif
1094
1095#if defined(PNG_READ_BACKGROUND_SUPPORTED) ||\
1096 defined(PNG_READ_ALPHA_MODE_SUPPORTED)
1097PNG_EXTERN void png_do_compose PNGARG((png_row_infop row_info,
1098 png_bytep row, png_structp png_ptr));
1099#endif
1100
1101#ifdef PNG_READ_GAMMA_SUPPORTED
1102PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info,
1103 png_bytep row, png_structp png_ptr));
1104#endif
1105
1106#ifdef PNG_READ_ALPHA_MODE_SUPPORTED
1107PNG_EXTERN void png_do_encode_alpha PNGARG((png_row_infop row_info,
1108 png_bytep row, png_structp png_ptr));
1109#endif
1110
1111#ifdef PNG_READ_EXPAND_SUPPORTED
1112PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
1113 png_bytep row, png_const_colorp palette, png_const_bytep trans,
1114 int num_trans));
1115PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
1116 png_bytep row, png_const_color_16p trans_color));
1117#endif
1118
1119#ifdef PNG_READ_EXPAND_16_SUPPORTED
1120PNG_EXTERN void png_do_expand_16 PNGARG((png_row_infop row_info,
1121 png_bytep row));
1122#endif
1123
1124/* The following decodes the appropriate chunks, and does error correction,
1125 * then calls the appropriate callback for the chunk if it is valid.
1126 */
1127
1128/* Decode the IHDR chunk */
1129PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
1130 png_uint_32 length));
1131PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
1132 png_uint_32 length));
1133PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
1134 png_uint_32 length));
1135
1136#ifdef PNG_READ_bKGD_SUPPORTED
1137PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
1138 png_uint_32 length));
1139#endif
1140
1141#ifdef PNG_READ_cHRM_SUPPORTED
1142PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
1143 png_uint_32 length));
1144#endif
1145
1146#ifdef PNG_READ_gAMA_SUPPORTED
1147PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
1148 png_uint_32 length));
1149#endif
1150
1151#ifdef PNG_READ_hIST_SUPPORTED
1152PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
1153 png_uint_32 length));
1154#endif
1155
1156#ifdef PNG_READ_iCCP_SUPPORTED
1157PNG_EXTERN void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
1158 png_uint_32 length));
1159#endif /* PNG_READ_iCCP_SUPPORTED */
1160
1161#ifdef PNG_READ_iTXt_SUPPORTED
1162PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
1163 png_uint_32 length));
1164#endif
1165
1166#ifdef PNG_READ_oFFs_SUPPORTED
1167PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
1168 png_uint_32 length));
1169#endif
1170
1171#ifdef PNG_READ_pCAL_SUPPORTED
1172PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
1173 png_uint_32 length));
1174#endif
1175
1176#ifdef PNG_READ_pHYs_SUPPORTED
1177PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
1178 png_uint_32 length));
1179#endif
1180
1181#ifdef PNG_READ_sBIT_SUPPORTED
1182PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
1183 png_uint_32 length));
1184#endif
1185
1186#ifdef PNG_READ_sCAL_SUPPORTED
1187PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
1188 png_uint_32 length));
1189#endif
1190
1191#ifdef PNG_READ_sPLT_SUPPORTED
1192PNG_EXTERN void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
1193 png_uint_32 length));
1194#endif /* PNG_READ_sPLT_SUPPORTED */
1195
1196#ifdef PNG_READ_sRGB_SUPPORTED
1197PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
1198 png_uint_32 length));
1199#endif
1200
1201#ifdef PNG_READ_tEXt_SUPPORTED
1202PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
1203 png_uint_32 length));
1204#endif
1205
1206#ifdef PNG_READ_tIME_SUPPORTED
1207PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
1208 png_uint_32 length));
1209#endif
1210
1211#ifdef PNG_READ_tRNS_SUPPORTED
1212PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
1213 png_uint_32 length));
1214#endif
1215
1216#ifdef PNG_READ_zTXt_SUPPORTED
1217PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
1218 png_uint_32 length));
1219#endif
1220
1221#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
1222PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
1223 png_infop info_ptr, png_uint_32 length));
1224#endif
1225
1226PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
1227 png_uint_32 chunk_name));
1228
1229#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
1230/* Exactly as png_handle_as_unknown() except that the argument is a 32-bit chunk
1231 * name, not a string.
1232 */
1233PNG_EXTERN int png_chunk_unknown_handling PNGARG((png_structp png_ptr,
1234 png_uint_32 chunk_name));
1235#endif
1236
1237/* Handle the transformations for reading and writing */
1238#ifdef PNG_READ_TRANSFORMS_SUPPORTED
1239PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr,
1240 png_row_infop row_info));
1241#endif
1242#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
1243PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr,
1244 png_row_infop row_info));
1245#endif
1246
1247#ifdef PNG_READ_TRANSFORMS_SUPPORTED
1248PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));
1249#endif
1250
1251#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1252PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
1253 png_infop info_ptr));
1254PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
1255 png_infop info_ptr));
1256PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));
1257PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
1258 png_uint_32 length));
1259PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
1260PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
1261PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
1262 png_bytep buffer, png_size_t buffer_length));
1263PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));
1264PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
1265 png_bytep buffer, png_size_t buffer_length));
1266PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));
1267PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
1268 png_infop info_ptr, png_uint_32 length));
1269PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
1270 png_infop info_ptr));
1271PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
1272 png_infop info_ptr));
1273PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));
1274PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
1275 png_infop info_ptr));
1276PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
1277 png_infop info_ptr));
1278PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));
1279# ifdef PNG_READ_tEXt_SUPPORTED
1280PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
1281 png_infop info_ptr, png_uint_32 length));
1282PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
1283 png_infop info_ptr));
1284# endif
1285# ifdef PNG_READ_zTXt_SUPPORTED
1286PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
1287 png_infop info_ptr, png_uint_32 length));
1288PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
1289 png_infop info_ptr));
1290# endif
1291# ifdef PNG_READ_iTXt_SUPPORTED
1292PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
1293 png_infop info_ptr, png_uint_32 length));
1294PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
1295 png_infop info_ptr));
1296# endif
1297
1298#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1299
1300#ifdef PNG_MNG_FEATURES_SUPPORTED
1301PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
1302 png_bytep row));
1303PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
1304 png_bytep row));
1305#endif
1306
1307/* Added at libpng version 1.4.0 */
1308#ifdef PNG_CHECK_cHRM_SUPPORTED
1309PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr,
1310 png_fixed_point int_white_x, png_fixed_point int_white_y,
1311 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
1312 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
1313 png_fixed_point int_blue_y));
1314#endif
1315
1316#ifdef PNG_CHECK_cHRM_SUPPORTED
1317/* Added at libpng version 1.2.34 and 1.4.0 */
1318/* Currently only used by png_check_cHRM_fixed */
1319PNG_EXTERN void png_64bit_product PNGARG((long v1, long v2,
1320 unsigned long *hi_product, unsigned long *lo_product));
1321#endif
1322
1323#ifdef PNG_cHRM_SUPPORTED
1324/* Added at libpng version 1.5.5 */
1325typedef struct png_xy
1326{
1327 png_fixed_point redx, redy;
1328 png_fixed_point greenx, greeny;
1329 png_fixed_point bluex, bluey;
1330 png_fixed_point whitex, whitey;
1331} png_xy;
1332
1333typedef struct png_XYZ
1334{
1335 png_fixed_point redX, redY, redZ;
1336 png_fixed_point greenX, greenY, greenZ;
1337 png_fixed_point blueX, blueY, blueZ;
1338} png_XYZ;
1339
1340/* The conversion APIs return 0 on success, non-zero on a parameter error. They
1341 * allow conversion between the above representations of a color encoding. When
1342 * converting from XYZ end points to chromaticities the absolute magnitude of
1343 * the end points is lost, when converting back the sum of the Y values of the
1344 * three end points will be 1.0
1345 */
1346PNG_EXTERN int png_xy_from_XYZ PNGARG((png_xy *xy, png_XYZ XYZ));
1347PNG_EXTERN int png_XYZ_from_xy PNGARG((png_XYZ *XYZ, png_xy xy));
1348PNG_EXTERN int png_XYZ_from_xy_checked PNGARG((png_structp png_ptr,
1349 png_XYZ *XYZ, png_xy xy));
1350#endif
1351
1352/* Added at libpng version 1.4.0 */
1353PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr,
1354 png_uint_32 width, png_uint_32 height, int bit_depth,
1355 int color_type, int interlace_type, int compression_type,
1356 int filter_type));
1357
1358/* Free all memory used by the read (old method - NOT DLL EXPORTED) */
1359PNG_EXTERN void png_read_destroy PNGARG((png_structp png_ptr,
1360 png_infop info_ptr, png_infop end_info_ptr));
1361
1362/* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
1363PNG_EXTERN void png_write_destroy PNGARG((png_structp png_ptr));
1364
1365#ifdef USE_FAR_KEYWORD /* memory model conversion function */
1366PNG_EXTERN void *png_far_to_near PNGARG((png_structp png_ptr, png_voidp ptr,
1367 int check));
1368#endif /* USE_FAR_KEYWORD */
1369
1370#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
1371PNG_EXTERN PNG_FUNCTION(void, png_fixed_error, (png_structp png_ptr,
1372 png_const_charp name),PNG_NORETURN);
1373#endif
1374
1375/* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite
1376 * the end. Always leaves the buffer nul terminated. Never errors out (and
1377 * there is no error code.)
1378 */
1379PNG_EXTERN size_t png_safecat(png_charp buffer, size_t bufsize, size_t pos,
1380 png_const_charp string);
1381
1382/* Various internal functions to handle formatted warning messages, currently
1383 * only implemented for warnings.
1384 */
1385#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)
1386/* Utility to dump an unsigned value into a buffer, given a start pointer and
1387 * and end pointer (which should point just *beyond* the end of the buffer!)
1388 * Returns the pointer to the start of the formatted string. This utility only
1389 * does unsigned values.
1390 */
1391PNG_EXTERN png_charp png_format_number(png_const_charp start, png_charp end,
1392 int format, png_alloc_size_t number);
1393
1394/* Convenience macro that takes an array: */
1395#define PNG_FORMAT_NUMBER(buffer,format,number) \
1396 png_format_number(buffer, buffer + (sizeof buffer), format, number)
1397
1398/* Suggested size for a number buffer (enough for 64 bits and a sign!) */
1399#define PNG_NUMBER_BUFFER_SIZE 24
1400
1401/* These are the integer formats currently supported, the name is formed from
1402 * the standard printf(3) format string.
1403 */
1404#define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */
1405#define PNG_NUMBER_FORMAT_02u 2
1406#define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */
1407#define PNG_NUMBER_FORMAT_02d 2
1408#define PNG_NUMBER_FORMAT_x 3
1409#define PNG_NUMBER_FORMAT_02x 4
1410#define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */
1411#endif
1412
1413#ifdef PNG_WARNINGS_SUPPORTED
1414/* New defines and members adding in libpng-1.5.4 */
1415# define PNG_WARNING_PARAMETER_SIZE 32
1416# define PNG_WARNING_PARAMETER_COUNT 8
1417
1418/* An l-value of this type has to be passed to the APIs below to cache the
1419 * values of the parameters to a formatted warning message.
1420 */
1421typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][
1422 PNG_WARNING_PARAMETER_SIZE];
1423
1424PNG_EXTERN void png_warning_parameter(png_warning_parameters p, int number,
1425 png_const_charp string);
1426 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters,
1427 * including the trailing '\0'.
1428 */
1429PNG_EXTERN void png_warning_parameter_unsigned(png_warning_parameters p,
1430 int number, int format, png_alloc_size_t value);
1431 /* Use png_alloc_size_t because it is an unsigned type as big as any we
1432 * need to output. Use the following for a signed value.
1433 */
1434PNG_EXTERN void png_warning_parameter_signed(png_warning_parameters p,
1435 int number, int format, png_int_32 value);
1436
1437PNG_EXTERN void png_formatted_warning(png_structp png_ptr,
1438 png_warning_parameters p, png_const_charp message);
1439 /* 'message' follows the X/Open approach of using @1, @2 to insert
1440 * parameters previously supplied using the above functions. Errors in
1441 * specifying the paramters will simple result in garbage substitutions.
1442 */
1443#endif
1444
1445/* ASCII to FP interfaces, currently only implemented if sCAL
1446 * support is required.
1447 */
1448#if defined(PNG_READ_sCAL_SUPPORTED)
1449/* MAX_DIGITS is actually the maximum number of characters in an sCAL
1450 * width or height, derived from the precision (number of significant
1451 * digits - a build time settable option) and assumpitions about the
1452 * maximum ridiculous exponent.
1453 */
1454#define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/)
1455
1456#ifdef PNG_FLOATING_POINT_SUPPORTED
1457PNG_EXTERN void png_ascii_from_fp PNGARG((png_structp png_ptr, png_charp ascii,
1458 png_size_t size, double fp, unsigned int precision));
1459#endif /* FLOATING_POINT */
1460
1461#ifdef PNG_FIXED_POINT_SUPPORTED
1462PNG_EXTERN void png_ascii_from_fixed PNGARG((png_structp png_ptr,
1463 png_charp ascii, png_size_t size, png_fixed_point fp));
1464#endif /* FIXED_POINT */
1465#endif /* READ_sCAL */
1466
1467#if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED)
1468/* An internal API to validate the format of a floating point number.
1469 * The result is the index of the next character. If the number is
1470 * not valid it will be the index of a character in the supposed number.
1471 *
1472 * The format of a number is defined in the PNG extensions specification
1473 * and this API is strictly conformant to that spec, not anyone elses!
1474 *
1475 * The format as a regular expression is:
1476 *
1477 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)?
1478 *
1479 * or:
1480 *
1481 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)?
1482 *
1483 * The complexity is that either integer or fraction must be present and the
1484 * fraction is permitted to have no digits only if the integer is present.
1485 *
1486 * NOTE: The dangling E problem.
1487 * There is a PNG valid floating point number in the following:
1488 *
1489 * PNG floating point numb1.ers are not greedy.
1490 *
1491 * Working this out requires *TWO* character lookahead (because of the
1492 * sign), the parser does not do this - it will fail at the 'r' - this
1493 * doesn't matter for PNG sCAL chunk values, but it requires more care
1494 * if the value were ever to be embedded in something more complex. Use
1495 * ANSI-C strtod if you need the lookahead.
1496 */
1497/* State table for the parser. */
1498#define PNG_FP_INTEGER 0 /* before or in integer */
1499#define PNG_FP_FRACTION 1 /* before or in fraction */
1500#define PNG_FP_EXPONENT 2 /* before or in exponent */
1501#define PNG_FP_STATE 3 /* mask for the above */
1502#define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */
1503#define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */
1504#define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */
1505#define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */
1506#define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */
1507
1508/* These three values don't affect the parser. They are set but not used.
1509 */
1510#define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */
1511#define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */
1512#define PNG_FP_NONZERO 256 /* A non-zero value */
1513#define PNG_FP_STICKY 448 /* The above three flags */
1514
1515/* This is available for the caller to store in 'state' if required. Do not
1516 * call the parser after setting it (the parser sometimes clears it.)
1517 */
1518#define PNG_FP_INVALID 512 /* Available for callers as a distinct value */
1519
1520/* Result codes for the parser (boolean - true meants ok, false means
1521 * not ok yet.)
1522 */
1523#define PNG_FP_MAYBE 0 /* The number may be valid in the future */
1524#define PNG_FP_OK 1 /* The number is valid */
1525
1526/* Tests on the sticky non-zero and negative flags. To pass these checks
1527 * the state must also indicate that the whole number is valid - this is
1528 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this
1529 * is equivalent to PNG_FP_OK above.)
1530 */
1531#define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO)
1532 /* NZ_MASK: the string is valid and a non-zero negative value */
1533#define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO)
1534 /* Z MASK: the string is valid and a non-zero value. */
1535 /* PNG_FP_SAW_DIGIT: the string is valid. */
1536#define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT)
1537#define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK)
1538#define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK)
1539
1540/* The actual parser. This can be called repeatedly, it updates
1541 * the index into the string and the state variable (which must
1542 * be initialzed to 0). It returns a result code, as above. There
1543 * is no point calling the parser any more if it fails to advance to
1544 * the end of the string - it is stuck on an invalid character (or
1545 * terminated by '\0').
1546 *
1547 * Note that the pointer will consume an E or even an E+ then leave
1548 * a 'maybe' state even though a preceding integer.fraction is valid.
1549 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was
1550 * a valid number. It's possible to recover from this by calling
1551 * the parser again (from the start, with state 0) but with a string
1552 * that omits the last character (i.e. set the size to the index of
1553 * the problem character.) This has not been tested within libpng.
1554 */
1555PNG_EXTERN int png_check_fp_number PNGARG((png_const_charp string,
1556 png_size_t size, int *statep, png_size_tp whereami));
1557
1558/* This is the same but it checks a complete string and returns true
1559 * only if it just contains a floating point number. As of 1.5.4 this
1560 * function also returns the state at the end of parsing the number if
1561 * it was valid (otherwise it returns 0.) This can be used for testing
1562 * for negative or zero values using the sticky flag.
1563 */
1564PNG_EXTERN int png_check_fp_string PNGARG((png_const_charp string,
1565 png_size_t size));
1566#endif /* pCAL || sCAL */
1567
1568#if defined(PNG_READ_GAMMA_SUPPORTED) ||\
1569 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED)
1570/* Added at libpng version 1.5.0 */
1571/* This is a utility to provide a*times/div (rounded) and indicate
1572 * if there is an overflow. The result is a boolean - false (0)
1573 * for overflow, true (1) if no overflow, in which case *res
1574 * holds the result.
1575 */
1576PNG_EXTERN int png_muldiv PNGARG((png_fixed_point_p res, png_fixed_point a,
1577 png_int_32 multiplied_by, png_int_32 divided_by));
1578#endif
1579
1580#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED)
1581/* Same deal, but issue a warning on overflow and return 0. */
1582PNG_EXTERN png_fixed_point png_muldiv_warn PNGARG((png_structp png_ptr,
1583 png_fixed_point a, png_int_32 multiplied_by, png_int_32 divided_by));
1584#endif
1585
1586#ifdef PNG_READ_GAMMA_SUPPORTED
1587/* Calculate a reciprocal - used for gamma values. This returns
1588 * 0 if the argument is 0 in order to maintain an undefined value,
1589 * there are no warnings.
1590 */
1591PNG_EXTERN png_fixed_point png_reciprocal PNGARG((png_fixed_point a));
1592
1593/* The same but gives a reciprocal of the product of two fixed point
1594 * values. Accuracy is suitable for gamma calculations but this is
1595 * not exact - use png_muldiv for that.
1596 */
1597PNG_EXTERN png_fixed_point png_reciprocal2 PNGARG((png_fixed_point a,
1598 png_fixed_point b));
1599#endif
1600
1601#ifdef PNG_READ_GAMMA_SUPPORTED
1602/* Internal fixed point gamma correction. These APIs are called as
1603 * required to convert single values - they don't need to be fast,
1604 * they are not used when processing image pixel values.
1605 *
1606 * While the input is an 'unsigned' value it must actually be the
1607 * correct bit value - 0..255 or 0..65535 as required.
1608 */
1609PNG_EXTERN png_uint_16 png_gamma_correct PNGARG((png_structp png_ptr,
1610 unsigned int value, png_fixed_point gamma_value));
1611PNG_EXTERN int png_gamma_significant PNGARG((png_fixed_point gamma_value));
1612PNG_EXTERN png_uint_16 png_gamma_16bit_correct PNGARG((unsigned int value,
1613 png_fixed_point gamma_value));
1614PNG_EXTERN png_byte png_gamma_8bit_correct PNGARG((unsigned int value,
1615 png_fixed_point gamma_value));
1616PNG_EXTERN void png_destroy_gamma_table(png_structp png_ptr);
1617PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr,
1618 int bit_depth));
1619#endif
1620
1621/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
1622
1623#include "pngdebug.h"
1624
1625#ifdef __cplusplus
1626}
1627#endif
1628
1629#endif /* PNGPRIV_H */
generated by cgit v1.1 at 2024-07-12 02:21:38 +0000