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  1. /* pngpriv.h - private declarations for use inside libpng
  2. *
  3. * For conditions of distribution and use, see copyright notice in png.h
  4. * Copyright (c) 1998-2013 Glenn Randers-Pehrson
  5. * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  6. * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  7. *
  8. * Last changed in libpng 1.6.1 [March 28, 2013]
  9. *
  10. * This code is released under the libpng license.
  11. * For conditions of distribution and use, see the disclaimer
  12. * and license in png.h
  13. */
  14. /* The symbols declared in this file (including the functions declared
  15. * as extern) are PRIVATE. They are not part of the libpng public
  16. * interface, and are not recommended for use by regular applications.
  17. * Some of them may become public in the future; others may stay private,
  18. * change in an incompatible way, or even disappear.
  19. * Although the libpng users are not forbidden to include this header,
  20. * they should be well aware of the issues that may arise from doing so.
  21. */
  22. #ifndef PNGPRIV_H
  23. #define PNGPRIV_H
  24. /* Feature Test Macros. The following are defined here to ensure that correctly
  25. * implemented libraries reveal the APIs libpng needs to build and hide those
  26. * that are not needed and potentially damaging to the compilation.
  27. *
  28. * Feature Test Macros must be defined before any system header is included (see
  29. * POSIX 1003.1 2.8.2 "POSIX Symbols."
  30. *
  31. * These macros only have an effect if the operating system supports either
  32. * POSIX 1003.1 or C99, or both. On other operating systems (particularly
  33. * Windows/Visual Studio) there is no effect; the OS specific tests below are
  34. * still required (as of 2011-05-02.)
  35. */
  36. #define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */
  37. #ifndef PNG_VERSION_INFO_ONLY
  38. /* Standard library headers not required by png.h: */
  39. # include <stdlib.h>
  40. # include <string.h>
  41. #endif
  42. #define PNGLIB_BUILD /*libpng is being built, not used*/
  43. /* If HAVE_CONFIG_H is defined during the build then the build system must
  44. * provide an appropriate "config.h" file on the include path. The header file
  45. * must provide definitions as required below (search for "HAVE_CONFIG_H");
  46. * see configure.ac for more details of the requirements. The macro
  47. * "PNG_NO_CONFIG_H" is provided for maintainers to test for dependencies on
  48. * 'configure'; define this macro to prevent the configure build including the
  49. * configure generated config.h. Libpng is expected to compile without *any*
  50. * special build system support on a reasonably ANSI-C compliant system.
  51. */
  52. #if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H)
  53. # include <config.h>
  54. /* Pick up the definition of 'restrict' from config.h if it was read: */
  55. # define PNG_RESTRICT restrict
  56. #endif
  57. /* To support symbol prefixing it is necessary to know *before* including png.h
  58. * whether the fixed point (and maybe other) APIs are exported, because if they
  59. * are not internal definitions may be required. This is handled below just
  60. * before png.h is included, but load the configuration now if it is available.
  61. */
  62. #ifndef PNGLCONF_H
  63. # include "pnglibconf.h"
  64. #endif
  65. /* Local renames may change non-exported API functions from png.h */
  66. #if defined(PNG_PREFIX) && !defined(PNGPREFIX_H)
  67. # include "pngprefix.h"
  68. #endif
  69. #ifdef PNG_USER_CONFIG
  70. # include "pngusr.h"
  71. /* These should have been defined in pngusr.h */
  72. # ifndef PNG_USER_PRIVATEBUILD
  73. # define PNG_USER_PRIVATEBUILD "Custom libpng build"
  74. # endif
  75. # ifndef PNG_USER_DLLFNAME_POSTFIX
  76. # define PNG_USER_DLLFNAME_POSTFIX "Cb"
  77. # endif
  78. #endif
  79. /* Is this a build of a DLL where compilation of the object modules requires
  80. * different preprocessor settings to those required for a simple library? If
  81. * so PNG_BUILD_DLL must be set.
  82. *
  83. * If libpng is used inside a DLL but that DLL does not export the libpng APIs
  84. * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a
  85. * static library of libpng then link the DLL against that.
  86. */
  87. #ifndef PNG_BUILD_DLL
  88. # ifdef DLL_EXPORT
  89. /* This is set by libtool when files are compiled for a DLL; libtool
  90. * always compiles twice, even on systems where it isn't necessary. Set
  91. * PNG_BUILD_DLL in case it is necessary:
  92. */
  93. # define PNG_BUILD_DLL
  94. # else
  95. # ifdef _WINDLL
  96. /* This is set by the Microsoft Visual Studio IDE in projects that
  97. * build a DLL. It can't easily be removed from those projects (it
  98. * isn't visible in the Visual Studio UI) so it is a fairly reliable
  99. * indication that PNG_IMPEXP needs to be set to the DLL export
  100. * attributes.
  101. */
  102. # define PNG_BUILD_DLL
  103. # else
  104. # ifdef __DLL__
  105. /* This is set by the Borland C system when compiling for a DLL
  106. * (as above.)
  107. */
  108. # define PNG_BUILD_DLL
  109. # else
  110. /* Add additional compiler cases here. */
  111. # endif
  112. # endif
  113. # endif
  114. #endif /* Setting PNG_BUILD_DLL if required */
  115. /* See pngconf.h for more details: the builder of the library may set this on
  116. * the command line to the right thing for the specific compilation system or it
  117. * may be automagically set above (at present we know of no system where it does
  118. * need to be set on the command line.)
  119. *
  120. * PNG_IMPEXP must be set here when building the library to prevent pngconf.h
  121. * setting it to the "import" setting for a DLL build.
  122. */
  123. #ifndef PNG_IMPEXP
  124. # ifdef PNG_BUILD_DLL
  125. # define PNG_IMPEXP PNG_DLL_EXPORT
  126. # else
  127. /* Not building a DLL, or the DLL doesn't require specific export
  128. * definitions.
  129. */
  130. # define PNG_IMPEXP
  131. # endif
  132. #endif
  133. /* No warnings for private or deprecated functions in the build: */
  134. #ifndef PNG_DEPRECATED
  135. # define PNG_DEPRECATED
  136. #endif
  137. #ifndef PNG_PRIVATE
  138. # define PNG_PRIVATE
  139. #endif
  140. /* Symbol preprocessing support.
  141. *
  142. * To enable listing global, but internal, symbols the following macros should
  143. * always be used to declare an extern data or function object in this file.
  144. */
  145. #ifndef PNG_INTERNAL_DATA
  146. # define PNG_INTERNAL_DATA(type, name, array) extern type name array
  147. #endif
  148. #ifndef PNG_INTERNAL_FUNCTION
  149. # define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\
  150. extern PNG_FUNCTION(type, name, args, PNG_EMPTY attributes)
  151. #endif
  152. /* If floating or fixed point APIs are disabled they may still be compiled
  153. * internally. To handle this make sure they are declared as the appropriate
  154. * internal extern function (otherwise the symbol prefixing stuff won't work and
  155. * the functions will be used without definitions.)
  156. *
  157. * NOTE: although all the API functions are declared here they are not all
  158. * actually built! Because the declarations are still made it is necessary to
  159. * fake out types that they depend on.
  160. */
  161. #ifndef PNG_FP_EXPORT
  162. # ifndef PNG_FLOATING_POINT_SUPPORTED
  163. # define PNG_FP_EXPORT(ordinal, type, name, args)\
  164. PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
  165. # ifndef PNG_VERSION_INFO_ONLY
  166. typedef struct png_incomplete png_double;
  167. typedef png_double* png_doublep;
  168. typedef const png_double* png_const_doublep;
  169. typedef png_double** png_doublepp;
  170. # endif
  171. # endif
  172. #endif
  173. #ifndef PNG_FIXED_EXPORT
  174. # ifndef PNG_FIXED_POINT_SUPPORTED
  175. # define PNG_FIXED_EXPORT(ordinal, type, name, args)\
  176. PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
  177. # endif
  178. #endif
  179. #include "png.h"
  180. /* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */
  181. #ifndef PNG_DLL_EXPORT
  182. # define PNG_DLL_EXPORT
  183. #endif
  184. /* SECURITY and SAFETY:
  185. *
  186. * By default libpng is built without any internal limits on image size,
  187. * individual heap (png_malloc) allocations or the total amount of memory used.
  188. * If PNG_SAFE_LIMITS_SUPPORTED is defined, however, the limits below are used
  189. * (unless individually overridden). These limits are believed to be fairly
  190. * safe, but builders of secure systems should verify the values against the
  191. * real system capabilities.
  192. */
  193. #ifdef PNG_SAFE_LIMITS_SUPPORTED
  194. /* 'safe' limits */
  195. # ifndef PNG_USER_WIDTH_MAX
  196. # define PNG_USER_WIDTH_MAX 1000000
  197. # endif
  198. # ifndef PNG_USER_HEIGHT_MAX
  199. # define PNG_USER_HEIGHT_MAX 1000000
  200. # endif
  201. # ifndef PNG_USER_CHUNK_CACHE_MAX
  202. # define PNG_USER_CHUNK_CACHE_MAX 128
  203. # endif
  204. # ifndef PNG_USER_CHUNK_MALLOC_MAX
  205. # define PNG_USER_CHUNK_MALLOC_MAX 8000000
  206. # endif
  207. #else
  208. /* values for no limits */
  209. # ifndef PNG_USER_WIDTH_MAX
  210. # define PNG_USER_WIDTH_MAX 0x7fffffff
  211. # endif
  212. # ifndef PNG_USER_HEIGHT_MAX
  213. # define PNG_USER_HEIGHT_MAX 0x7fffffff
  214. # endif
  215. # ifndef PNG_USER_CHUNK_CACHE_MAX
  216. # define PNG_USER_CHUNK_CACHE_MAX 0
  217. # endif
  218. # ifndef PNG_USER_CHUNK_MALLOC_MAX
  219. # define PNG_USER_CHUNK_MALLOC_MAX 0
  220. # endif
  221. #endif
  222. /* Moved to pngpriv.h at libpng-1.5.0 */
  223. /* NOTE: some of these may have been used in external applications as
  224. * these definitions were exposed in pngconf.h prior to 1.5.
  225. */
  226. /* If you are running on a machine where you cannot allocate more
  227. * than 64K of memory at once, uncomment this. While libpng will not
  228. * normally need that much memory in a chunk (unless you load up a very
  229. * large file), zlib needs to know how big of a chunk it can use, and
  230. * libpng thus makes sure to check any memory allocation to verify it
  231. * will fit into memory.
  232. *
  233. * zlib provides 'MAXSEG_64K' which, if defined, indicates the
  234. * same limit and pngconf.h (already included) sets the limit
  235. * if certain operating systems are detected.
  236. */
  237. #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
  238. # define PNG_MAX_MALLOC_64K
  239. #endif
  240. #ifndef PNG_UNUSED
  241. /* Unused formal parameter warnings are silenced using the following macro
  242. * which is expected to have no bad effects on performance (optimizing
  243. * compilers will probably remove it entirely). Note that if you replace
  244. * it with something other than whitespace, you must include the terminating
  245. * semicolon.
  246. */
  247. # define PNG_UNUSED(param) (void)param;
  248. #endif
  249. /* Just a little check that someone hasn't tried to define something
  250. * contradictory.
  251. */
  252. #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K)
  253. # undef PNG_ZBUF_SIZE
  254. # define PNG_ZBUF_SIZE 65536L
  255. #endif
  256. /* If warnings or errors are turned off the code is disabled or redirected here.
  257. * From 1.5.4 functions have been added to allow very limited formatting of
  258. * error and warning messages - this code will also be disabled here.
  259. */
  260. #ifdef PNG_WARNINGS_SUPPORTED
  261. # define PNG_WARNING_PARAMETERS(p) png_warning_parameters p;
  262. #else
  263. # define png_warning(s1,s2) ((void)(s1))
  264. # define png_chunk_warning(s1,s2) ((void)(s1))
  265. # define png_warning_parameter(p,number,string) ((void)0)
  266. # define png_warning_parameter_unsigned(p,number,format,value) ((void)0)
  267. # define png_warning_parameter_signed(p,number,format,value) ((void)0)
  268. # define png_formatted_warning(pp,p,message) ((void)(pp))
  269. # define PNG_WARNING_PARAMETERS(p)
  270. #endif
  271. #ifndef PNG_ERROR_TEXT_SUPPORTED
  272. # define png_error(s1,s2) png_err(s1)
  273. # define png_chunk_error(s1,s2) png_err(s1)
  274. # define png_fixed_error(s1,s2) png_err(s1)
  275. #endif
  276. /* C allows up-casts from (void*) to any pointer and (const void*) to any
  277. * pointer to a const object. C++ regards this as a type error and requires an
  278. * explicit, static, cast and provides the static_cast<> rune to ensure that
  279. * const is not cast away.
  280. */
  281. #ifdef __cplusplus
  282. # define png_voidcast(type, value) static_cast<type>(value)
  283. # define png_constcast(type, value) const_cast<type>(value)
  284. # define png_aligncast(type, value) \
  285. static_cast<type>(static_cast<void*>(value))
  286. # define png_aligncastconst(type, value) \
  287. static_cast<type>(static_cast<const void*>(value))
  288. #else
  289. # define png_voidcast(type, value) (value)
  290. # define png_constcast(type, value) ((type)(value))
  291. # define png_aligncast(type, value) ((void*)(value))
  292. # define png_aligncastconst(type, value) ((const void*)(value))
  293. #endif /* __cplusplus */
  294. /* Some fixed point APIs are still required even if not exported because
  295. * they get used by the corresponding floating point APIs. This magic
  296. * deals with this:
  297. */
  298. #ifdef PNG_FIXED_POINT_SUPPORTED
  299. # define PNGFAPI PNGAPI
  300. #else
  301. # define PNGFAPI /* PRIVATE */
  302. #endif
  303. #ifndef PNG_VERSION_INFO_ONLY
  304. /* Other defines specific to compilers can go here. Try to keep
  305. * them inside an appropriate ifdef/endif pair for portability.
  306. */
  307. #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\
  308. defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
  309. /* png.c requires the following ANSI-C constants if the conversion of
  310. * floating point to ASCII is implemented therein:
  311. *
  312. * DBL_DIG Maximum number of decimal digits (can be set to any constant)
  313. * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value)
  314. * DBL_MAX Maximum floating point number (can be set to an arbitrary value)
  315. */
  316. # include <float.h>
  317. # if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
  318. defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
  319. /* We need to check that <math.h> hasn't already been included earlier
  320. * as it seems it doesn't agree with <fp.h>, yet we should really use
  321. * <fp.h> if possible.
  322. */
  323. # if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
  324. # include <fp.h>
  325. # endif
  326. # else
  327. # include <math.h>
  328. # endif
  329. # if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
  330. /* Amiga SAS/C: We must include builtin FPU functions when compiling using
  331. * MATH=68881
  332. */
  333. # include <m68881.h>
  334. # endif
  335. #endif
  336. /* This provides the non-ANSI (far) memory allocation routines. */
  337. #if defined(__TURBOC__) && defined(__MSDOS__)
  338. # include <mem.h>
  339. # include <alloc.h>
  340. #endif
  341. #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \
  342. defined(_WIN32) || defined(__WIN32__)
  343. # include <windows.h> /* defines _WINDOWS_ macro */
  344. #endif
  345. #endif /* PNG_VERSION_INFO_ONLY */
  346. /* Moved here around 1.5.0beta36 from pngconf.h */
  347. /* Users may want to use these so they are not private. Any library
  348. * functions that are passed far data must be model-independent.
  349. */
  350. /* Memory model/platform independent fns */
  351. #ifndef PNG_ABORT
  352. # ifdef _WINDOWS_
  353. # define PNG_ABORT() ExitProcess(0)
  354. # else
  355. # define PNG_ABORT() abort()
  356. # endif
  357. #endif
  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. #ifndef PNG_ALIGN_TYPE
  368. /* Default to using aligned access optimizations and requiring alignment to a
  369. * multiple of the data type size. Override in a compiler specific fashion
  370. * if necessary by inserting tests here:
  371. */
  372. # define PNG_ALIGN_TYPE PNG_ALIGN_SIZE
  373. #endif
  374. #if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE
  375. /* This is used because in some compiler implementations non-aligned
  376. * structure members are supported, so the offsetof approach below fails.
  377. * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access
  378. * is good for performance. Do not do this unless you have tested the result
  379. * and understand it.
  380. */
  381. # define png_alignof(type) (sizeof (type))
  382. #else
  383. # if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET
  384. # define png_alignof(type) offsetof(struct{char c; type t;}, t)
  385. # else
  386. # if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS
  387. # define png_alignof(type) (1)
  388. # endif
  389. /* Else leave png_alignof undefined to prevent use thereof */
  390. # endif
  391. #endif
  392. /* This implicitly assumes alignment is always to a power of 2. */
  393. #ifdef png_alignof
  394. # define png_isaligned(ptr, type)\
  395. ((((const char*)ptr-(const char*)0) & (png_alignof(type)-1)) == 0)
  396. #else
  397. # define png_isaligned(ptr, type) 0
  398. #endif
  399. /* End of memory model/platform independent support */
  400. /* End of 1.5.0beta36 move from pngconf.h */
  401. /* CONSTANTS and UTILITY MACROS
  402. * These are used internally by libpng and not exposed in the API
  403. */
  404. /* Various modes of operation. Note that after an init, mode is set to
  405. * zero automatically when the structure is created. Three of these
  406. * are defined in png.h because they need to be visible to applications
  407. * that call png_set_unknown_chunk().
  408. */
  409. /* #define PNG_HAVE_IHDR 0x01 (defined in png.h) */
  410. /* #define PNG_HAVE_PLTE 0x02 (defined in png.h) */
  411. #define PNG_HAVE_IDAT 0x04
  412. /* #define PNG_AFTER_IDAT 0x08 (defined in png.h) */
  413. #define PNG_HAVE_IEND 0x10
  414. /* 0x20 (unused) */
  415. /* 0x40 (unused) */
  416. /* 0x80 (unused) */
  417. #define PNG_HAVE_CHUNK_HEADER 0x100
  418. #define PNG_WROTE_tIME 0x200
  419. #define PNG_WROTE_INFO_BEFORE_PLTE 0x400
  420. #define PNG_BACKGROUND_IS_GRAY 0x800
  421. #define PNG_HAVE_PNG_SIGNATURE 0x1000
  422. #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
  423. /* 0x4000 (unused) */
  424. #define PNG_IS_READ_STRUCT 0x8000 /* Else is a write struct */
  425. /* Flags for the transformations the PNG library does on the image data */
  426. #define PNG_BGR 0x0001
  427. #define PNG_INTERLACE 0x0002
  428. #define PNG_PACK 0x0004
  429. #define PNG_SHIFT 0x0008
  430. #define PNG_SWAP_BYTES 0x0010
  431. #define PNG_INVERT_MONO 0x0020
  432. #define PNG_QUANTIZE 0x0040
  433. #define PNG_COMPOSE 0x0080 /* Was PNG_BACKGROUND */
  434. #define PNG_BACKGROUND_EXPAND 0x0100
  435. #define PNG_EXPAND_16 0x0200 /* Added to libpng 1.5.2 */
  436. #define PNG_16_TO_8 0x0400 /* Becomes 'chop' in 1.5.4 */
  437. #define PNG_RGBA 0x0800
  438. #define PNG_EXPAND 0x1000
  439. #define PNG_GAMMA 0x2000
  440. #define PNG_GRAY_TO_RGB 0x4000
  441. #define PNG_FILLER 0x8000
  442. #define PNG_PACKSWAP 0x10000
  443. #define PNG_SWAP_ALPHA 0x20000
  444. #define PNG_STRIP_ALPHA 0x40000
  445. #define PNG_INVERT_ALPHA 0x80000
  446. #define PNG_USER_TRANSFORM 0x100000
  447. #define PNG_RGB_TO_GRAY_ERR 0x200000
  448. #define PNG_RGB_TO_GRAY_WARN 0x400000
  449. #define PNG_RGB_TO_GRAY 0x600000 /* two bits, RGB_TO_GRAY_ERR|WARN */
  450. #define PNG_ENCODE_ALPHA 0x800000 /* Added to libpng-1.5.4 */
  451. #define PNG_ADD_ALPHA 0x1000000 /* Added to libpng-1.2.7 */
  452. #define PNG_EXPAND_tRNS 0x2000000 /* Added to libpng-1.2.9 */
  453. #define PNG_SCALE_16_TO_8 0x4000000 /* Added to libpng-1.5.4 */
  454. /* 0x8000000 unused */
  455. /* 0x10000000 unused */
  456. /* 0x20000000 unused */
  457. /* 0x40000000 unused */
  458. /* Flags for png_create_struct */
  459. #define PNG_STRUCT_PNG 0x0001
  460. #define PNG_STRUCT_INFO 0x0002
  461. /* Scaling factor for filter heuristic weighting calculations */
  462. #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
  463. #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
  464. /* Flags for the png_ptr->flags rather than declaring a byte for each one */
  465. #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
  466. #define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002 /* Added to libpng-1.6.0 */
  467. /* 0x0004 unused */
  468. #define PNG_FLAG_ZSTREAM_ENDED 0x0008 /* Added to libpng-1.6.0 */
  469. /* 0x0010 unused */
  470. /* 0x0020 unused */
  471. #define PNG_FLAG_ROW_INIT 0x0040
  472. #define PNG_FLAG_FILLER_AFTER 0x0080
  473. #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
  474. #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
  475. #define PNG_FLAG_CRC_CRITICAL_USE 0x0400
  476. #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
  477. #define PNG_FLAG_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.4 */
  478. #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.4 */
  479. #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.4 */
  480. /* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000 */
  481. /* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000 */
  482. #define PNG_FLAG_LIBRARY_MISMATCH 0x20000
  483. #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000
  484. #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000
  485. #define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000 /* Added to libpng-1.4.0 */
  486. #define PNG_FLAG_APP_WARNINGS_WARN 0x200000 /* Added to libpng-1.6.0 */
  487. #define PNG_FLAG_APP_ERRORS_WARN 0x400000 /* Added to libpng-1.6.0 */
  488. /* 0x800000 unused */
  489. /* 0x1000000 unused */
  490. /* 0x2000000 unused */
  491. /* 0x4000000 unused */
  492. /* 0x8000000 unused */
  493. /* 0x10000000 unused */
  494. /* 0x20000000 unused */
  495. /* 0x40000000 unused */
  496. #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
  497. PNG_FLAG_CRC_ANCILLARY_NOWARN)
  498. #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
  499. PNG_FLAG_CRC_CRITICAL_IGNORE)
  500. #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
  501. PNG_FLAG_CRC_CRITICAL_MASK)
  502. /* Save typing and make code easier to understand */
  503. #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
  504. abs((int)((c1).green) - (int)((c2).green)) + \
  505. abs((int)((c1).blue) - (int)((c2).blue)))
  506. /* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255
  507. * by dividing by 257 *with rounding*. This macro is exact for the given range.
  508. * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the
  509. * macro were established by experiment (modifying the added value). The macro
  510. * has a second variant that takes a value already scaled by 255 and divides by
  511. * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it
  512. * only gives off-by-one errors and only for 0.5% (1 in 200) of the values.
  513. */
  514. #define PNG_DIV65535(v24) (((v24) + 32895) >> 16)
  515. #define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255)
  516. /* Added to libpng-1.2.6 JB */
  517. #define PNG_ROWBYTES(pixel_bits, width) \
  518. ((pixel_bits) >= 8 ? \
  519. ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \
  520. (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) )
  521. /* PNG_OUT_OF_RANGE returns true if value is outside the range
  522. * ideal-delta..ideal+delta. Each argument is evaluated twice.
  523. * "ideal" and "delta" should be constants, normally simple
  524. * integers, "value" a variable. Added to libpng-1.2.6 JB
  525. */
  526. #define PNG_OUT_OF_RANGE(value, ideal, delta) \
  527. ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
  528. /* Conversions between fixed and floating point, only defined if
  529. * required (to make sure the code doesn't accidentally use float
  530. * when it is supposedly disabled.)
  531. */
  532. #ifdef PNG_FLOATING_POINT_SUPPORTED
  533. /* The floating point conversion can't overflow, though it can and
  534. * does lose accuracy relative to the original fixed point value.
  535. * In practice this doesn't matter because png_fixed_point only
  536. * stores numbers with very low precision. The png_ptr and s
  537. * arguments are unused by default but are there in case error
  538. * checking becomes a requirement.
  539. */
  540. #define png_float(png_ptr, fixed, s) (.00001 * (fixed))
  541. /* The fixed point conversion performs range checking and evaluates
  542. * its argument multiple times, so must be used with care. The
  543. * range checking uses the PNG specification values for a signed
  544. * 32 bit fixed point value except that the values are deliberately
  545. * rounded-to-zero to an integral value - 21474 (21474.83 is roughly
  546. * (2^31-1) * 100000). 's' is a string that describes the value being
  547. * converted.
  548. *
  549. * NOTE: this macro will raise a png_error if the range check fails,
  550. * therefore it is normally only appropriate to use this on values
  551. * that come from API calls or other sources where an out of range
  552. * error indicates a programming error, not a data error!
  553. *
  554. * NOTE: by default this is off - the macro is not used - because the
  555. * function call saves a lot of code.
  556. */
  557. #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED
  558. #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\
  559. ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0))
  560. #endif
  561. /* else the corresponding function is defined below, inside the scope of the
  562. * cplusplus test.
  563. */
  564. #endif
  565. /* Constants for known chunk types. If you need to add a chunk, define the name
  566. * here. For historical reasons these constants have the form png_<name>; i.e.
  567. * the prefix is lower case. Please use decimal values as the parameters to
  568. * match the ISO PNG specification and to avoid relying on the C locale
  569. * interpretation of character values.
  570. *
  571. * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values
  572. * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string
  573. * to be generated if required.
  574. *
  575. * PNG_32b correctly produces a value shifted by up to 24 bits, even on
  576. * architectures where (int) is only 16 bits.
  577. */
  578. #define PNG_32b(b,s) ((png_uint_32)(b) << (s))
  579. #define PNG_CHUNK(b1,b2,b3,b4) \
  580. (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0))
  581. #define png_IHDR PNG_CHUNK( 73, 72, 68, 82)
  582. #define png_IDAT PNG_CHUNK( 73, 68, 65, 84)
  583. #define png_IEND PNG_CHUNK( 73, 69, 78, 68)
  584. #define png_PLTE PNG_CHUNK( 80, 76, 84, 69)
  585. #define png_bKGD PNG_CHUNK( 98, 75, 71, 68)
  586. #define png_cHRM PNG_CHUNK( 99, 72, 82, 77)
  587. #define png_gAMA PNG_CHUNK(103, 65, 77, 65)
  588. #define png_hIST PNG_CHUNK(104, 73, 83, 84)
  589. #define png_iCCP PNG_CHUNK(105, 67, 67, 80)
  590. #define png_iTXt PNG_CHUNK(105, 84, 88, 116)
  591. #define png_oFFs PNG_CHUNK(111, 70, 70, 115)
  592. #define png_pCAL PNG_CHUNK(112, 67, 65, 76)
  593. #define png_sCAL PNG_CHUNK(115, 67, 65, 76)
  594. #define png_pHYs PNG_CHUNK(112, 72, 89, 115)
  595. #define png_sBIT PNG_CHUNK(115, 66, 73, 84)
  596. #define png_sPLT PNG_CHUNK(115, 80, 76, 84)
  597. #define png_sRGB PNG_CHUNK(115, 82, 71, 66)
  598. #define png_sTER PNG_CHUNK(115, 84, 69, 82)
  599. #define png_tEXt PNG_CHUNK(116, 69, 88, 116)
  600. #define png_tIME PNG_CHUNK(116, 73, 77, 69)
  601. #define png_tRNS PNG_CHUNK(116, 82, 78, 83)
  602. #define png_zTXt PNG_CHUNK(122, 84, 88, 116)
  603. /* The following will work on (signed char*) strings, whereas the get_uint_32
  604. * macro will fail on top-bit-set values because of the sign extension.
  605. */
  606. #define PNG_CHUNK_FROM_STRING(s)\
  607. PNG_CHUNK(0xff&(s)[0], 0xff&(s)[1], 0xff&(s)[2], 0xff&(s)[3])
  608. /* This uses (char), not (png_byte) to avoid warnings on systems where (char) is
  609. * signed and the argument is a (char[]) This macro will fail miserably on
  610. * systems where (char) is more than 8 bits.
  611. */
  612. #define PNG_STRING_FROM_CHUNK(s,c)\
  613. (void)(((char*)(s))[0]=(char)((c)>>24), ((char*)(s))[1]=(char)((c)>>16),\
  614. ((char*)(s))[2]=(char)((c)>>8), ((char*)(s))[3]=(char)((c)))
  615. /* Do the same but terminate with a null character. */
  616. #define PNG_CSTRING_FROM_CHUNK(s,c)\
  617. (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0)
  618. /* Test on flag values as defined in the spec (section 5.4): */
  619. #define PNG_CHUNK_ANCILLIARY(c) (1 & ((c) >> 29))
  620. #define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLIARY(c))
  621. #define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21))
  622. #define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13))
  623. #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5))
  624. /* Gamma values (new at libpng-1.5.4): */
  625. #define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */
  626. #define PNG_GAMMA_MAC_INVERSE 65909
  627. #define PNG_GAMMA_sRGB_INVERSE 45455
  628. /* Almost everything below is C specific; the #defines above can be used in
  629. * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot.
  630. */
  631. #ifndef PNG_VERSION_INFO_ONLY
  632. #include "pngstruct.h"
  633. #include "pnginfo.h"
  634. /* This is used for 16 bit gamma tables -- only the top level pointers are
  635. * const; this could be changed:
  636. */
  637. typedef const png_uint_16p * png_const_uint_16pp;
  638. /* Added to libpng-1.5.7: sRGB conversion tables */
  639. #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
  640. defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
  641. #ifdef PNG_SIMPLIFIED_READ_SUPPORTED
  642. PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]);
  643. /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value,
  644. * 0..65535. This table gives the closest 16-bit answers (no errors).
  645. */
  646. #endif
  647. PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]);
  648. PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]);
  649. #define PNG_sRGB_FROM_LINEAR(linear) ((png_byte)((png_sRGB_base[(linear)>>15] +\
  650. ((((linear)&0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8))
  651. /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB
  652. * encoded value with maximum error 0.646365. Note that the input is not a
  653. * 16-bit value; it has been multiplied by 255! */
  654. #endif /* PNG_SIMPLIFIED_READ/WRITE */
  655. /* Internal functions; these are not exported from a DLL however because they
  656. * are used within several of the C source files they have to be C extern.
  657. *
  658. * All of these functions must be declared with PNG_INTERNAL_FUNCTION.
  659. */
  660. /* Zlib support */
  661. #define PNG_UNEXPECTED_ZLIB_RETURN (-7)
  662. PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret),
  663. PNG_EMPTY);
  664. /* Used by the zlib handling functions to ensure that z_stream::msg is always
  665. * set before they return.
  666. */
  667. #ifdef PNG_WRITE_SUPPORTED
  668. PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr,
  669. png_compression_bufferp *list),PNG_EMPTY);
  670. /* Free the buffer list used by the compressed write code. */
  671. #endif
  672. #if defined(PNG_FLOATING_POINT_SUPPORTED) && \
  673. !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \
  674. (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \
  675. defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \
  676. defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \
  677. (defined(PNG_sCAL_SUPPORTED) && \
  678. defined(PNG_FLOATING_ARITHMETIC_SUPPORTED))
  679. PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr,
  680. double fp, png_const_charp text),PNG_EMPTY);
  681. #endif
  682. /* Check the user version string for compatibility, returns false if the version
  683. * numbers aren't compatible.
  684. */
  685. PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr,
  686. png_const_charp user_png_ver),PNG_EMPTY);
  687. /* Internal base allocator - no messages, NULL on failure to allocate. This
  688. * does, however, call the application provided allocator and that could call
  689. * png_error (although that would be a bug in the application implementation.)
  690. */
  691. PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr,
  692. png_alloc_size_t size),PNG_ALLOCATED);
  693. #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\
  694. defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED)
  695. /* Internal array allocator, outputs no error or warning messages on failure,
  696. * just returns NULL.
  697. */
  698. PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr,
  699. int nelements, size_t element_size),PNG_ALLOCATED);
  700. /* The same but an existing array is extended by add_elements. This function
  701. * also memsets the new elements to 0 and copies the old elements. The old
  702. * array is not freed or altered.
  703. */
  704. PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr,
  705. png_const_voidp array, int old_elements, int add_elements,
  706. size_t element_size),PNG_ALLOCATED);
  707. #endif /* text, sPLT or unknown chunks */
  708. /* Magic to create a struct when there is no struct to call the user supplied
  709. * memory allocators. Because error handling has not been set up the memory
  710. * handlers can't safely call png_error, but this is an obscure and undocumented
  711. * restriction so libpng has to assume that the 'free' handler, at least, might
  712. * call png_error.
  713. */
  714. PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct,
  715. (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
  716. png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn,
  717. png_free_ptr free_fn),PNG_ALLOCATED);
  718. /* Free memory from internal libpng struct */
  719. PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr),
  720. PNG_EMPTY);
  721. /* Free an allocated jmp_buf (always succeeds) */
  722. PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY);
  723. /* Function to allocate memory for zlib. PNGAPI is disallowed. */
  724. PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size),
  725. PNG_ALLOCATED);
  726. /* Function to free memory for zlib. PNGAPI is disallowed. */
  727. PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY);
  728. /* Next four functions are used internally as callbacks. PNGCBAPI is required
  729. * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to
  730. * PNGCBAPI at 1.5.0
  731. */
  732. PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr,
  733. png_bytep data, png_size_t length),PNG_EMPTY);
  734. #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
  735. PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr,
  736. png_bytep buffer, png_size_t length),PNG_EMPTY);
  737. #endif
  738. PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr,
  739. png_bytep data, png_size_t length),PNG_EMPTY);
  740. #ifdef PNG_WRITE_FLUSH_SUPPORTED
  741. # ifdef PNG_STDIO_SUPPORTED
  742. PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr),
  743. PNG_EMPTY);
  744. # endif
  745. #endif
  746. /* Reset the CRC variable */
  747. PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY);
  748. /* Write the "data" buffer to whatever output you are using */
  749. PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr,
  750. png_const_bytep data, png_size_t length),PNG_EMPTY);
  751. /* Read and check the PNG file signature */
  752. PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr,
  753. png_inforp info_ptr),PNG_EMPTY);
  754. /* Read the chunk header (length + type name) */
  755. PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr),
  756. PNG_EMPTY);
  757. /* Read data from whatever input you are using into the "data" buffer */
  758. PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data,
  759. png_size_t length),PNG_EMPTY);
  760. /* Read bytes into buf, and update png_ptr->crc */
  761. PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf,
  762. png_uint_32 length),PNG_EMPTY);
  763. /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
  764. PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr,
  765. png_uint_32 skip),PNG_EMPTY);
  766. /* Read the CRC from the file and compare it to the libpng calculated CRC */
  767. PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY);
  768. /* Calculate the CRC over a section of data. Note that we are only
  769. * passing a maximum of 64K on systems that have this as a memory limit,
  770. * since this is the maximum buffer size we can specify.
  771. */
  772. PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr,
  773. png_const_bytep ptr, png_size_t length),PNG_EMPTY);
  774. #ifdef PNG_WRITE_FLUSH_SUPPORTED
  775. PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY);
  776. #endif
  777. /* Write various chunks */
  778. /* Write the IHDR chunk, and update the png_struct with the necessary
  779. * information.
  780. */
  781. PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr,
  782. png_uint_32 width, png_uint_32 height, int bit_depth, int color_type,
  783. int compression_method, int filter_method, int interlace_method),PNG_EMPTY);
  784. PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr,
  785. png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY);
  786. PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr,
  787. png_const_bytep row_data, png_alloc_size_t row_data_length, int flush),
  788. PNG_EMPTY);
  789. PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY);
  790. #ifdef PNG_WRITE_gAMA_SUPPORTED
  791. PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr,
  792. png_fixed_point file_gamma),PNG_EMPTY);
  793. #endif
  794. #ifdef PNG_WRITE_sBIT_SUPPORTED
  795. PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr,
  796. png_const_color_8p sbit, int color_type),PNG_EMPTY);
  797. #endif
  798. #ifdef PNG_WRITE_cHRM_SUPPORTED
  799. PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr,
  800. const png_xy *xy), PNG_EMPTY);
  801. /* The xy value must have been previously validated */
  802. #endif
  803. #ifdef PNG_WRITE_sRGB_SUPPORTED
  804. PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr,
  805. int intent),PNG_EMPTY);
  806. #endif
  807. #ifdef PNG_WRITE_iCCP_SUPPORTED
  808. PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr,
  809. png_const_charp name, png_const_bytep profile), PNG_EMPTY);
  810. /* The profile must have been previously validated for correctness, the
  811. * length comes from the first four bytes. Only the base, deflate,
  812. * compression is supported.
  813. */
  814. #endif
  815. #ifdef PNG_WRITE_sPLT_SUPPORTED
  816. PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr,
  817. png_const_sPLT_tp palette),PNG_EMPTY);
  818. #endif
  819. #ifdef PNG_WRITE_tRNS_SUPPORTED
  820. PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr,
  821. png_const_bytep trans, png_const_color_16p values, int number,
  822. int color_type),PNG_EMPTY);
  823. #endif
  824. #ifdef PNG_WRITE_bKGD_SUPPORTED
  825. PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr,
  826. png_const_color_16p values, int color_type),PNG_EMPTY);
  827. #endif
  828. #ifdef PNG_WRITE_hIST_SUPPORTED
  829. PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr,
  830. png_const_uint_16p hist, int num_hist),PNG_EMPTY);
  831. #endif
  832. /* Chunks that have keywords */
  833. #ifdef PNG_WRITE_tEXt_SUPPORTED
  834. PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr,
  835. png_const_charp key, png_const_charp text, png_size_t text_len),PNG_EMPTY);
  836. #endif
  837. #ifdef PNG_WRITE_zTXt_SUPPORTED
  838. PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp
  839. key, png_const_charp text, png_size_t text_len, int compression),PNG_EMPTY);
  840. #endif
  841. #ifdef PNG_WRITE_iTXt_SUPPORTED
  842. PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr,
  843. int compression, png_const_charp key, png_const_charp lang,
  844. png_const_charp lang_key, png_const_charp text),PNG_EMPTY);
  845. #endif
  846. #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */
  847. PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr,
  848. png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY);
  849. #endif
  850. #ifdef PNG_WRITE_oFFs_SUPPORTED
  851. PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr,
  852. png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY);
  853. #endif
  854. #ifdef PNG_WRITE_pCAL_SUPPORTED
  855. PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr,
  856. png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
  857. png_const_charp units, png_charpp params),PNG_EMPTY);
  858. #endif
  859. #ifdef PNG_WRITE_pHYs_SUPPORTED
  860. PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr,
  861. png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
  862. int unit_type),PNG_EMPTY);
  863. #endif
  864. #ifdef PNG_WRITE_tIME_SUPPORTED
  865. PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr,
  866. png_const_timep mod_time),PNG_EMPTY);
  867. #endif
  868. #ifdef PNG_WRITE_sCAL_SUPPORTED
  869. PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr,
  870. int unit, png_const_charp width, png_const_charp height),PNG_EMPTY);
  871. #endif
  872. /* Called when finished processing a row of data */
  873. PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr),
  874. PNG_EMPTY);
  875. /* Internal use only. Called before first row of data */
  876. PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr),
  877. PNG_EMPTY);
  878. /* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an
  879. * array of png_ptr->width pixels. If the image is not interlaced or this
  880. * is the final pass this just does a memcpy, otherwise the "display" flag
  881. * is used to determine whether to copy pixels that are not in the current pass.
  882. *
  883. * Because 'png_do_read_interlace' (below) replicates pixels this allows this
  884. * function to achieve the documented 'blocky' appearance during interlaced read
  885. * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row'
  886. * are not changed if they are not in the current pass, when display is 0.
  887. *
  888. * 'display' must be 0 or 1, otherwise the memcpy will be done regardless.
  889. *
  890. * The API always reads from the png_struct row buffer and always assumes that
  891. * it is full width (png_do_read_interlace has already been called.)
  892. *
  893. * This function is only ever used to write to row buffers provided by the
  894. * caller of the relevant libpng API and the row must have already been
  895. * transformed by the read transformations.
  896. *
  897. * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed
  898. * bitmasks for use within the code, otherwise runtime generated masks are used.
  899. * The default is compile time masks.
  900. */
  901. #ifndef PNG_USE_COMPILE_TIME_MASKS
  902. # define PNG_USE_COMPILE_TIME_MASKS 1
  903. #endif
  904. PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr,
  905. png_bytep row, int display),PNG_EMPTY);
  906. #ifdef PNG_READ_INTERLACING_SUPPORTED
  907. /* Expand an interlaced row: the 'row_info' describes the pass data that has
  908. * been read in and must correspond to the pixels in 'row', the pixels are
  909. * expanded (moved apart) in 'row' to match the final layout, when doing this
  910. * the pixels are *replicated* to the intervening space. This is essential for
  911. * the correct operation of png_combine_row, above.
  912. */
  913. PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info,
  914. png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY);
  915. #endif
  916. /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
  917. #ifdef PNG_WRITE_INTERLACING_SUPPORTED
  918. /* Grab pixels out of a row for an interlaced pass */
  919. PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info,
  920. png_bytep row, int pass),PNG_EMPTY);
  921. #endif
  922. /* Unfilter a row: check the filter value before calling this, there is no point
  923. * calling it for PNG_FILTER_VALUE_NONE.
  924. */
  925. PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop
  926. row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY);
  927. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info,
  928. png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  929. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop
  930. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  931. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop
  932. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  933. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop
  934. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  935. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop
  936. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  937. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop
  938. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  939. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop
  940. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  941. /* Choose the best filter to use and filter the row data */
  942. PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr,
  943. png_row_infop row_info),PNG_EMPTY);
  944. #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
  945. PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr,
  946. png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY);
  947. /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer
  948. * is NULL the function checks, instead, for the end of the stream. In this
  949. * case a benign error will be issued if the stream end is not found or if
  950. * extra data has to be consumed.
  951. */
  952. PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr),
  953. PNG_EMPTY);
  954. /* This cleans up when the IDAT LZ stream does not end when the last image
  955. * byte is read; there is still some pending input.
  956. */
  957. PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr),
  958. PNG_EMPTY);
  959. /* Finish a row while reading, dealing with interlacing passes, etc. */
  960. #endif
  961. /* Initialize the row buffers, etc. */
  962. PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY);
  963. #ifdef PNG_READ_TRANSFORMS_SUPPORTED
  964. /* Optional call to update the users info structure */
  965. PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr,
  966. png_inforp info_ptr),PNG_EMPTY);
  967. #endif
  968. /* These are the functions that do the transformations */
  969. #ifdef PNG_READ_FILLER_SUPPORTED
  970. PNG_INTERNAL_FUNCTION(void,png_do_read_filler,(png_row_infop row_info,
  971. png_bytep row, png_uint_32 filler, png_uint_32 flags),PNG_EMPTY);
  972. #endif
  973. #ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
  974. PNG_INTERNAL_FUNCTION(void,png_do_read_swap_alpha,(png_row_infop row_info,
  975. png_bytep row),PNG_EMPTY);
  976. #endif
  977. #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
  978. PNG_INTERNAL_FUNCTION(void,png_do_write_swap_alpha,(png_row_infop row_info,
  979. png_bytep row),PNG_EMPTY);
  980. #endif
  981. #ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
  982. PNG_INTERNAL_FUNCTION(void,png_do_read_invert_alpha,(png_row_infop row_info,
  983. png_bytep row),PNG_EMPTY);
  984. #endif
  985. #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
  986. PNG_INTERNAL_FUNCTION(void,png_do_write_invert_alpha,(png_row_infop row_info,
  987. png_bytep row),PNG_EMPTY);
  988. #endif
  989. #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
  990. defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
  991. PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info,
  992. png_bytep row, int at_start),PNG_EMPTY);
  993. #endif
  994. #ifdef PNG_16BIT_SUPPORTED
  995. #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
  996. PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info,
  997. png_bytep row),PNG_EMPTY);
  998. #endif
  999. #endif
  1000. #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
  1001. defined(PNG_WRITE_PACKSWAP_SUPPORTED)
  1002. PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info,
  1003. png_bytep row),PNG_EMPTY);
  1004. #endif
  1005. #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
  1006. PNG_INTERNAL_FUNCTION(int,png_do_rgb_to_gray,(png_structrp png_ptr,
  1007. png_row_infop row_info, png_bytep row),PNG_EMPTY);
  1008. #endif
  1009. #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
  1010. PNG_INTERNAL_FUNCTION(void,png_do_gray_to_rgb,(png_row_infop row_info,
  1011. png_bytep row),PNG_EMPTY);
  1012. #endif
  1013. #ifdef PNG_READ_PACK_SUPPORTED
  1014. PNG_INTERNAL_FUNCTION(void,png_do_unpack,(png_row_infop row_info,
  1015. png_bytep row),PNG_EMPTY);
  1016. #endif
  1017. #ifdef PNG_READ_SHIFT_SUPPORTED
  1018. PNG_INTERNAL_FUNCTION(void,png_do_unshift,(png_row_infop row_info,
  1019. png_bytep row, png_const_color_8p sig_bits),PNG_EMPTY);
  1020. #endif
  1021. #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
  1022. PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info,
  1023. png_bytep row),PNG_EMPTY);
  1024. #endif
  1025. #ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
  1026. PNG_INTERNAL_FUNCTION(void,png_do_scale_16_to_8,(png_row_infop row_info,
  1027. png_bytep row),PNG_EMPTY);
  1028. #endif
  1029. #ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED
  1030. PNG_INTERNAL_FUNCTION(void,png_do_chop,(png_row_infop row_info,
  1031. png_bytep row),PNG_EMPTY);
  1032. #endif
  1033. #ifdef PNG_READ_QUANTIZE_SUPPORTED
  1034. PNG_INTERNAL_FUNCTION(void,png_do_quantize,(png_row_infop row_info,
  1035. png_bytep row, png_const_bytep palette_lookup,
  1036. png_const_bytep quantize_lookup),PNG_EMPTY);
  1037. # ifdef PNG_CORRECT_PALETTE_SUPPORTED
  1038. PNG_INTERNAL_FUNCTION(void,png_correct_palette,(png_structrp png_ptr,
  1039. png_colorp palette, int num_palette),PNG_EMPTY);
  1040. # endif
  1041. #endif
  1042. #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
  1043. PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info,
  1044. png_bytep row),PNG_EMPTY);
  1045. #endif
  1046. #ifdef PNG_WRITE_PACK_SUPPORTED
  1047. PNG_INTERNAL_FUNCTION(void,png_do_pack,(png_row_infop row_info,
  1048. png_bytep row, png_uint_32 bit_depth),PNG_EMPTY);
  1049. #endif
  1050. #ifdef PNG_WRITE_SHIFT_SUPPORTED
  1051. PNG_INTERNAL_FUNCTION(void,png_do_shift,(png_row_infop row_info,
  1052. png_bytep row, png_const_color_8p bit_depth),PNG_EMPTY);
  1053. #endif
  1054. #if defined(PNG_READ_BACKGROUND_SUPPORTED) ||\
  1055. defined(PNG_READ_ALPHA_MODE_SUPPORTED)
  1056. PNG_INTERNAL_FUNCTION(void,png_do_compose,(png_row_infop row_info,
  1057. png_bytep row, png_structrp png_ptr),PNG_EMPTY);
  1058. #endif
  1059. #ifdef PNG_READ_GAMMA_SUPPORTED
  1060. PNG_INTERNAL_FUNCTION(void,png_do_gamma,(png_row_infop row_info,
  1061. png_bytep row, png_structrp png_ptr),PNG_EMPTY);
  1062. #endif
  1063. #ifdef PNG_READ_ALPHA_MODE_SUPPORTED
  1064. PNG_INTERNAL_FUNCTION(void,png_do_encode_alpha,(png_row_infop row_info,
  1065. png_bytep row, png_structrp png_ptr),PNG_EMPTY);
  1066. #endif
  1067. #ifdef PNG_READ_EXPAND_SUPPORTED
  1068. PNG_INTERNAL_FUNCTION(void,png_do_expand_palette,(png_row_infop row_info,
  1069. png_bytep row, png_const_colorp palette, png_const_bytep trans,
  1070. int num_trans),PNG_EMPTY);
  1071. PNG_INTERNAL_FUNCTION(void,png_do_expand,(png_row_infop row_info,
  1072. png_bytep row, png_const_color_16p trans_color),PNG_EMPTY);
  1073. #endif
  1074. #ifdef PNG_READ_EXPAND_16_SUPPORTED
  1075. PNG_INTERNAL_FUNCTION(void,png_do_expand_16,(png_row_infop row_info,
  1076. png_bytep row),PNG_EMPTY);
  1077. #endif
  1078. /* The following decodes the appropriate chunks, and does error correction,
  1079. * then calls the appropriate callback for the chunk if it is valid.
  1080. */
  1081. /* Decode the IHDR chunk */
  1082. PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr,
  1083. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1084. PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr,
  1085. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1086. PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr,
  1087. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1088. #ifdef PNG_READ_bKGD_SUPPORTED
  1089. PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr,
  1090. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1091. #endif
  1092. #ifdef PNG_READ_cHRM_SUPPORTED
  1093. PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr,
  1094. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1095. #endif
  1096. #ifdef PNG_READ_gAMA_SUPPORTED
  1097. PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr,
  1098. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1099. #endif
  1100. #ifdef PNG_READ_hIST_SUPPORTED
  1101. PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr,
  1102. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1103. #endif
  1104. #ifdef PNG_READ_iCCP_SUPPORTED
  1105. PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr,
  1106. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1107. #endif /* PNG_READ_iCCP_SUPPORTED */
  1108. #ifdef PNG_READ_iTXt_SUPPORTED
  1109. PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr,
  1110. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1111. #endif
  1112. #ifdef PNG_READ_oFFs_SUPPORTED
  1113. PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr,
  1114. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1115. #endif
  1116. #ifdef PNG_READ_pCAL_SUPPORTED
  1117. PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr,
  1118. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1119. #endif
  1120. #ifdef PNG_READ_pHYs_SUPPORTED
  1121. PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr,
  1122. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1123. #endif
  1124. #ifdef PNG_READ_sBIT_SUPPORTED
  1125. PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr,
  1126. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1127. #endif
  1128. #ifdef PNG_READ_sCAL_SUPPORTED
  1129. PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr,
  1130. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1131. #endif
  1132. #ifdef PNG_READ_sPLT_SUPPORTED
  1133. PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr,
  1134. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1135. #endif /* PNG_READ_sPLT_SUPPORTED */
  1136. #ifdef PNG_READ_sRGB_SUPPORTED
  1137. PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr,
  1138. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1139. #endif
  1140. #ifdef PNG_READ_tEXt_SUPPORTED
  1141. PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr,
  1142. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1143. #endif
  1144. #ifdef PNG_READ_tIME_SUPPORTED
  1145. PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr,
  1146. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1147. #endif
  1148. #ifdef PNG_READ_tRNS_SUPPORTED
  1149. PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr,
  1150. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1151. #endif
  1152. #ifdef PNG_READ_zTXt_SUPPORTED
  1153. PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr,
  1154. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1155. #endif
  1156. PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_structrp png_ptr,
  1157. png_uint_32 chunk_name),PNG_EMPTY);
  1158. #ifdef PNG_READ_SUPPORTED
  1159. PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr,
  1160. png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY);
  1161. /* This is the function that gets called for unknown chunks. The 'keep'
  1162. * argument is either non-zero for a known chunk that has been set to be
  1163. * handled as unknown or zero for an unknown chunk. By default the function
  1164. * just skips the chunk or errors out if it is critical.
  1165. */
  1166. #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
  1167. #ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
  1168. PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling,
  1169. (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY);
  1170. /* Exactly as the API png_handle_as_unknown() except that the argument is a
  1171. * 32-bit chunk name, not a string.
  1172. */
  1173. #endif
  1174. #endif /* PNG_READ_UNKNOWN_CHUNKS_SUPPORTED */
  1175. #endif /* PNG_READ_SUPPORTED */
  1176. /* Handle the transformations for reading and writing */
  1177. #ifdef PNG_READ_TRANSFORMS_SUPPORTED
  1178. PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr,
  1179. png_row_infop row_info),PNG_EMPTY);
  1180. #endif
  1181. #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
  1182. PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr,
  1183. png_row_infop row_info),PNG_EMPTY);
  1184. #endif
  1185. #ifdef PNG_READ_TRANSFORMS_SUPPORTED
  1186. PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr),
  1187. PNG_EMPTY);
  1188. #endif
  1189. #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
  1190. PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr,
  1191. png_inforp info_ptr),PNG_EMPTY);
  1192. PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr,
  1193. png_inforp info_ptr),PNG_EMPTY);
  1194. PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY);
  1195. PNG_INTERNAL_FUNCTION(void,png_push_crc_skip,(png_structrp png_ptr,
  1196. png_uint_32 length),PNG_EMPTY);
  1197. PNG_INTERNAL_FUNCTION(void,png_push_crc_finish,(png_structrp png_ptr),
  1198. PNG_EMPTY);
  1199. PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr),
  1200. PNG_EMPTY);
  1201. PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr,
  1202. png_bytep buffer, png_size_t buffer_length),PNG_EMPTY);
  1203. PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY);
  1204. PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr,
  1205. png_bytep buffer, png_size_t buffer_length),PNG_EMPTY);
  1206. PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr),
  1207. PNG_EMPTY);
  1208. PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr,
  1209. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1210. PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr,
  1211. png_inforp info_ptr),PNG_EMPTY);
  1212. PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr,
  1213. png_inforp info_ptr),PNG_EMPTY);
  1214. PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr,
  1215. png_bytep row),PNG_EMPTY);
  1216. PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr,
  1217. png_inforp info_ptr),PNG_EMPTY);
  1218. PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr,
  1219. png_inforp info_ptr),PNG_EMPTY);
  1220. PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr),
  1221. PNG_EMPTY);
  1222. # ifdef PNG_READ_tEXt_SUPPORTED
  1223. PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr,
  1224. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1225. PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr,
  1226. png_inforp info_ptr),PNG_EMPTY);
  1227. # endif
  1228. # ifdef PNG_READ_zTXt_SUPPORTED
  1229. PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr,
  1230. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1231. PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr,
  1232. png_inforp info_ptr),PNG_EMPTY);
  1233. # endif
  1234. # ifdef PNG_READ_iTXt_SUPPORTED
  1235. PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr,
  1236. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1237. PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr,
  1238. png_inforp info_ptr),PNG_EMPTY);
  1239. # endif
  1240. #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
  1241. #ifdef PNG_MNG_FEATURES_SUPPORTED
  1242. PNG_INTERNAL_FUNCTION(void,png_do_read_intrapixel,(png_row_infop row_info,
  1243. png_bytep row),PNG_EMPTY);
  1244. PNG_INTERNAL_FUNCTION(void,png_do_write_intrapixel,(png_row_infop row_info,
  1245. png_bytep row),PNG_EMPTY);
  1246. #endif
  1247. /* Added at libpng version 1.6.0 */
  1248. #ifdef PNG_GAMMA_SUPPORTED
  1249. PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr,
  1250. png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY);
  1251. /* Set the colorspace gamma with a value provided by the application or by
  1252. * the gAMA chunk on read. The value will override anything set by an ICC
  1253. * profile.
  1254. */
  1255. PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr,
  1256. png_inforp info_ptr), PNG_EMPTY);
  1257. /* Synchronize the info 'valid' flags with the colorspace */
  1258. PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr,
  1259. png_inforp info_ptr), PNG_EMPTY);
  1260. /* Copy the png_struct colorspace to the info_struct and call the above to
  1261. * synchronize the flags. Checks for NULL info_ptr and does nothing.
  1262. */
  1263. #endif
  1264. /* Added at libpng version 1.4.0 */
  1265. #ifdef PNG_COLORSPACE_SUPPORTED
  1266. /* These internal functions are for maintaining the colorspace structure within
  1267. * a png_info or png_struct (or, indeed, both).
  1268. */
  1269. PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities,
  1270. (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy,
  1271. int preferred), PNG_EMPTY);
  1272. PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints,
  1273. (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ,
  1274. int preferred), PNG_EMPTY);
  1275. #ifdef PNG_sRGB_SUPPORTED
  1276. PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr,
  1277. png_colorspacerp colorspace, int intent), PNG_EMPTY);
  1278. /* This does set the colorspace gAMA and cHRM values too, but doesn't set the
  1279. * flags to write them, if it returns false there was a problem and an error
  1280. * message has already been output (but the colorspace may still need to be
  1281. * synced to record the invalid flag).
  1282. */
  1283. #endif /* sRGB */
  1284. #ifdef PNG_iCCP_SUPPORTED
  1285. PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr,
  1286. png_colorspacerp colorspace, png_const_charp name,
  1287. png_uint_32 profile_length, png_const_bytep profile, int color_type),
  1288. PNG_EMPTY);
  1289. /* The 'name' is used for information only */
  1290. /* Routines for checking parts of an ICC profile. */
  1291. PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr,
  1292. png_colorspacerp colorspace, png_const_charp name,
  1293. png_uint_32 profile_length), PNG_EMPTY);
  1294. PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr,
  1295. png_colorspacerp colorspace, png_const_charp name,
  1296. png_uint_32 profile_length,
  1297. png_const_bytep profile /* first 132 bytes only */, int color_type),
  1298. PNG_EMPTY);
  1299. PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr,
  1300. png_colorspacerp colorspace, png_const_charp name,
  1301. png_uint_32 profile_length,
  1302. png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY);
  1303. #ifdef PNG_sRGB_SUPPORTED
  1304. PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,(
  1305. png_const_structrp png_ptr, png_colorspacerp colorspace,
  1306. png_const_bytep profile, uLong adler), PNG_EMPTY);
  1307. /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may
  1308. * be zero to indicate that it is not available. It is used, if provided,
  1309. * as a fast check on the profile when checking to see if it is sRGB.
  1310. */
  1311. #endif
  1312. #endif /* iCCP */
  1313. #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
  1314. PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients,
  1315. (png_structrp png_ptr), PNG_EMPTY);
  1316. /* Set the rgb_to_gray coefficients from the colorspace Y values */
  1317. #endif /* READ_RGB_TO_GRAY */
  1318. #endif /* COLORSPACE */
  1319. /* Added at libpng version 1.4.0 */
  1320. PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr,
  1321. png_uint_32 width, png_uint_32 height, int bit_depth,
  1322. int color_type, int interlace_type, int compression_type,
  1323. int filter_type),PNG_EMPTY);
  1324. /* Added at libpng version 1.5.10 */
  1325. #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \
  1326. defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED)
  1327. PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes,
  1328. (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY);
  1329. #endif
  1330. #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
  1331. PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr,
  1332. png_const_charp name),PNG_NORETURN);
  1333. #endif
  1334. /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite
  1335. * the end. Always leaves the buffer nul terminated. Never errors out (and
  1336. * there is no error code.)
  1337. */
  1338. PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize,
  1339. size_t pos, png_const_charp string),PNG_EMPTY);
  1340. /* Various internal functions to handle formatted warning messages, currently
  1341. * only implemented for warnings.
  1342. */
  1343. #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)
  1344. /* Utility to dump an unsigned value into a buffer, given a start pointer and
  1345. * and end pointer (which should point just *beyond* the end of the buffer!)
  1346. * Returns the pointer to the start of the formatted string. This utility only
  1347. * does unsigned values.
  1348. */
  1349. PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start,
  1350. png_charp end, int format, png_alloc_size_t number),PNG_EMPTY);
  1351. /* Convenience macro that takes an array: */
  1352. #define PNG_FORMAT_NUMBER(buffer,format,number) \
  1353. png_format_number(buffer, buffer + (sizeof buffer), format, number)
  1354. /* Suggested size for a number buffer (enough for 64 bits and a sign!) */
  1355. #define PNG_NUMBER_BUFFER_SIZE 24
  1356. /* These are the integer formats currently supported, the name is formed from
  1357. * the standard printf(3) format string.
  1358. */
  1359. #define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */
  1360. #define PNG_NUMBER_FORMAT_02u 2
  1361. #define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */
  1362. #define PNG_NUMBER_FORMAT_02d 2
  1363. #define PNG_NUMBER_FORMAT_x 3
  1364. #define PNG_NUMBER_FORMAT_02x 4
  1365. #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */
  1366. #endif
  1367. #ifdef PNG_WARNINGS_SUPPORTED
  1368. /* New defines and members adding in libpng-1.5.4 */
  1369. # define PNG_WARNING_PARAMETER_SIZE 32
  1370. # define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */
  1371. /* An l-value of this type has to be passed to the APIs below to cache the
  1372. * values of the parameters to a formatted warning message.
  1373. */
  1374. typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][
  1375. PNG_WARNING_PARAMETER_SIZE];
  1376. PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p,
  1377. int number, png_const_charp string),PNG_EMPTY);
  1378. /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters,
  1379. * including the trailing '\0'.
  1380. */
  1381. PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned,
  1382. (png_warning_parameters p, int number, int format, png_alloc_size_t value),
  1383. PNG_EMPTY);
  1384. /* Use png_alloc_size_t because it is an unsigned type as big as any we
  1385. * need to output. Use the following for a signed value.
  1386. */
  1387. PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed,
  1388. (png_warning_parameters p, int number, int format, png_int_32 value),
  1389. PNG_EMPTY);
  1390. PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr,
  1391. png_warning_parameters p, png_const_charp message),PNG_EMPTY);
  1392. /* 'message' follows the X/Open approach of using @1, @2 to insert
  1393. * parameters previously supplied using the above functions. Errors in
  1394. * specifying the parameters will simply result in garbage substitutions.
  1395. */
  1396. #endif
  1397. #ifdef PNG_BENIGN_ERRORS_SUPPORTED
  1398. /* Application errors (new in 1.6); use these functions (declared below) for
  1399. * errors in the parameters or order of API function calls on read. The
  1400. * 'warning' should be used for an error that can be handled completely; the
  1401. * 'error' for one which can be handled safely but which may lose application
  1402. * information or settings.
  1403. *
  1404. * By default these both result in a png_error call prior to release, while in a
  1405. * released version the 'warning' is just a warning. However if the application
  1406. * explicitly disables benign errors (explicitly permitting the code to lose
  1407. * information) they both turn into warnings.
  1408. *
  1409. * If benign errors aren't supported they end up as the corresponding base call
  1410. * (png_warning or png_error.)
  1411. */
  1412. PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr,
  1413. png_const_charp message),PNG_EMPTY);
  1414. /* The application provided invalid parameters to an API function or called
  1415. * an API function at the wrong time, libpng can completely recover.
  1416. */
  1417. PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr,
  1418. png_const_charp message),PNG_EMPTY);
  1419. /* As above but libpng will ignore the call, or attempt some other partial
  1420. * recovery from the error.
  1421. */
  1422. #else
  1423. # define png_app_warning(pp,s) png_warning(pp,s)
  1424. # define png_app_error(pp,s) png_error(pp,s)
  1425. #endif
  1426. PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr,
  1427. png_const_charp message, int error),PNG_EMPTY);
  1428. /* Report a recoverable issue in chunk data. On read this is used to report
  1429. * a problem found while reading a particular chunk and the
  1430. * png_chunk_benign_error or png_chunk_warning function is used as
  1431. * appropriate. On write this is used to report an error that comes from
  1432. * data set via an application call to a png_set_ API and png_app_error or
  1433. * png_app_warning is used as appropriate.
  1434. *
  1435. * The 'error' parameter must have one of the following values:
  1436. */
  1437. #define PNG_CHUNK_WARNING 0 /* never an error */
  1438. #define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */
  1439. #define PNG_CHUNK_ERROR 2 /* always an error */
  1440. /* ASCII to FP interfaces, currently only implemented if sCAL
  1441. * support is required.
  1442. */
  1443. #if defined(PNG_sCAL_SUPPORTED)
  1444. /* MAX_DIGITS is actually the maximum number of characters in an sCAL
  1445. * width or height, derived from the precision (number of significant
  1446. * digits - a build time settable option) and assumptions about the
  1447. * maximum ridiculous exponent.
  1448. */
  1449. #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/)
  1450. #ifdef PNG_FLOATING_POINT_SUPPORTED
  1451. PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr,
  1452. png_charp ascii, png_size_t size, double fp, unsigned int precision),
  1453. PNG_EMPTY);
  1454. #endif /* FLOATING_POINT */
  1455. #ifdef PNG_FIXED_POINT_SUPPORTED
  1456. PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr,
  1457. png_charp ascii, png_size_t size, png_fixed_point fp),PNG_EMPTY);
  1458. #endif /* FIXED_POINT */
  1459. #endif /* sCAL */
  1460. #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED)
  1461. /* An internal API to validate the format of a floating point number.
  1462. * The result is the index of the next character. If the number is
  1463. * not valid it will be the index of a character in the supposed number.
  1464. *
  1465. * The format of a number is defined in the PNG extensions specification
  1466. * and this API is strictly conformant to that spec, not anyone elses!
  1467. *
  1468. * The format as a regular expression is:
  1469. *
  1470. * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)?
  1471. *
  1472. * or:
  1473. *
  1474. * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)?
  1475. *
  1476. * The complexity is that either integer or fraction must be present and the
  1477. * fraction is permitted to have no digits only if the integer is present.
  1478. *
  1479. * NOTE: The dangling E problem.
  1480. * There is a PNG valid floating point number in the following:
  1481. *
  1482. * PNG floating point numbers are not greedy.
  1483. *
  1484. * Working this out requires *TWO* character lookahead (because of the
  1485. * sign), the parser does not do this - it will fail at the 'r' - this
  1486. * doesn't matter for PNG sCAL chunk values, but it requires more care
  1487. * if the value were ever to be embedded in something more complex. Use
  1488. * ANSI-C strtod if you need the lookahead.
  1489. */
  1490. /* State table for the parser. */
  1491. #define PNG_FP_INTEGER 0 /* before or in integer */
  1492. #define PNG_FP_FRACTION 1 /* before or in fraction */
  1493. #define PNG_FP_EXPONENT 2 /* before or in exponent */
  1494. #define PNG_FP_STATE 3 /* mask for the above */
  1495. #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */
  1496. #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */
  1497. #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */
  1498. #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */
  1499. #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */
  1500. /* These three values don't affect the parser. They are set but not used.
  1501. */
  1502. #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */
  1503. #define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */
  1504. #define PNG_FP_NONZERO 256 /* A non-zero value */
  1505. #define PNG_FP_STICKY 448 /* The above three flags */
  1506. /* This is available for the caller to store in 'state' if required. Do not
  1507. * call the parser after setting it (the parser sometimes clears it.)
  1508. */
  1509. #define PNG_FP_INVALID 512 /* Available for callers as a distinct value */
  1510. /* Result codes for the parser (boolean - true meants ok, false means
  1511. * not ok yet.)
  1512. */
  1513. #define PNG_FP_MAYBE 0 /* The number may be valid in the future */
  1514. #define PNG_FP_OK 1 /* The number is valid */
  1515. /* Tests on the sticky non-zero and negative flags. To pass these checks
  1516. * the state must also indicate that the whole number is valid - this is
  1517. * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this
  1518. * is equivalent to PNG_FP_OK above.)
  1519. */
  1520. #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO)
  1521. /* NZ_MASK: the string is valid and a non-zero negative value */
  1522. #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO)
  1523. /* Z MASK: the string is valid and a non-zero value. */
  1524. /* PNG_FP_SAW_DIGIT: the string is valid. */
  1525. #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT)
  1526. #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK)
  1527. #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK)
  1528. /* The actual parser. This can be called repeatedly. It updates
  1529. * the index into the string and the state variable (which must
  1530. * be initialized to 0). It returns a result code, as above. There
  1531. * is no point calling the parser any more if it fails to advance to
  1532. * the end of the string - it is stuck on an invalid character (or
  1533. * terminated by '\0').
  1534. *
  1535. * Note that the pointer will consume an E or even an E+ and then leave
  1536. * a 'maybe' state even though a preceding integer.fraction is valid.
  1537. * The PNG_FP_WAS_VALID flag indicates that a preceding substring was
  1538. * a valid number. It's possible to recover from this by calling
  1539. * the parser again (from the start, with state 0) but with a string
  1540. * that omits the last character (i.e. set the size to the index of
  1541. * the problem character.) This has not been tested within libpng.
  1542. */
  1543. PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string,
  1544. png_size_t size, int *statep, png_size_tp whereami),PNG_EMPTY);
  1545. /* This is the same but it checks a complete string and returns true
  1546. * only if it just contains a floating point number. As of 1.5.4 this
  1547. * function also returns the state at the end of parsing the number if
  1548. * it was valid (otherwise it returns 0.) This can be used for testing
  1549. * for negative or zero values using the sticky flag.
  1550. */
  1551. PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string,
  1552. png_size_t size),PNG_EMPTY);
  1553. #endif /* pCAL || sCAL */
  1554. #if defined(PNG_READ_GAMMA_SUPPORTED) ||\
  1555. defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED)
  1556. /* Added at libpng version 1.5.0 */
  1557. /* This is a utility to provide a*times/div (rounded) and indicate
  1558. * if there is an overflow. The result is a boolean - false (0)
  1559. * for overflow, true (1) if no overflow, in which case *res
  1560. * holds the result.
  1561. */
  1562. PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a,
  1563. png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY);
  1564. #endif
  1565. #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED)
  1566. /* Same deal, but issue a warning on overflow and return 0. */
  1567. PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn,
  1568. (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by,
  1569. png_int_32 divided_by),PNG_EMPTY);
  1570. #endif
  1571. #ifdef PNG_GAMMA_SUPPORTED
  1572. /* Calculate a reciprocal - used for gamma values. This returns
  1573. * 0 if the argument is 0 in order to maintain an undefined value;
  1574. * there are no warnings.
  1575. */
  1576. PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a),
  1577. PNG_EMPTY);
  1578. #ifdef PNG_READ_GAMMA_SUPPORTED
  1579. /* The same but gives a reciprocal of the product of two fixed point
  1580. * values. Accuracy is suitable for gamma calculations but this is
  1581. * not exact - use png_muldiv for that. Only required at present on read.
  1582. */
  1583. PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a,
  1584. png_fixed_point b),PNG_EMPTY);
  1585. #endif
  1586. /* Return true if the gamma value is significantly different from 1.0 */
  1587. PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value),
  1588. PNG_EMPTY);
  1589. #endif
  1590. #ifdef PNG_READ_GAMMA_SUPPORTED
  1591. /* Internal fixed point gamma correction. These APIs are called as
  1592. * required to convert single values - they don't need to be fast,
  1593. * they are not used when processing image pixel values.
  1594. *
  1595. * While the input is an 'unsigned' value it must actually be the
  1596. * correct bit value - 0..255 or 0..65535 as required.
  1597. */
  1598. PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr,
  1599. unsigned int value, png_fixed_point gamma_value),PNG_EMPTY);
  1600. PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value,
  1601. png_fixed_point gamma_value),PNG_EMPTY);
  1602. PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value,
  1603. png_fixed_point gamma_value),PNG_EMPTY);
  1604. PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr),
  1605. PNG_EMPTY);
  1606. PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr,
  1607. int bit_depth),PNG_EMPTY);
  1608. #endif
  1609. /* SIMPLIFIED READ/WRITE SUPPORT */
  1610. #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
  1611. defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
  1612. /* The internal structure that png_image::opaque points to. */
  1613. typedef struct png_control
  1614. {
  1615. png_structp png_ptr;
  1616. png_infop info_ptr;
  1617. png_voidp error_buf; /* Always a jmp_buf at present. */
  1618. png_const_bytep memory; /* Memory buffer. */
  1619. png_size_t size; /* Size of the memory buffer. */
  1620. unsigned int for_write :1; /* Otherwise it is a read structure */
  1621. unsigned int owned_file :1; /* We own the file in io_ptr */
  1622. } png_control;
  1623. /* Return the pointer to the jmp_buf from a png_control: necessary because C
  1624. * does not reveal the type of the elements of jmp_buf.
  1625. */
  1626. #ifdef __cplusplus
  1627. # define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0])
  1628. #else
  1629. # define png_control_jmp_buf(pc) ((pc)->error_buf)
  1630. #endif
  1631. /* Utility to safely execute a piece of libpng code catching and logging any
  1632. * errors that might occur. Returns true on success, false on failure (either
  1633. * of the function or as a result of a png_error.)
  1634. */
  1635. PNG_INTERNAL_FUNCTION(void,png_safe_error,(png_structp png_ptr,
  1636. png_const_charp error_message),PNG_NORETURN);
  1637. #ifdef PNG_WARNINGS_SUPPORTED
  1638. PNG_INTERNAL_FUNCTION(void,png_safe_warning,(png_structp png_ptr,
  1639. png_const_charp warning_message),PNG_EMPTY);
  1640. #else
  1641. # define png_safe_warning 0/*dummy argument*/
  1642. #endif
  1643. PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image,
  1644. int (*function)(png_voidp), png_voidp arg),PNG_EMPTY);
  1645. /* Utility to log an error; this also cleans up the png_image; the function
  1646. * always returns 0 (false).
  1647. */
  1648. PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image,
  1649. png_const_charp error_message),PNG_EMPTY);
  1650. #ifndef PNG_SIMPLIFIED_READ_SUPPORTED
  1651. /* png_image_free is used by the write code but not exported */
  1652. PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY);
  1653. #endif /* !SIMPLIFIED_READ */
  1654. #endif /* SIMPLIFIED READ/WRITE */
  1655. #ifdef PNG_FILTER_OPTIMIZATIONS
  1656. PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr,
  1657. unsigned int bpp), PNG_EMPTY);
  1658. /* This is the initialization function for hardware specific optimizations,
  1659. * one implementation (for ARM NEON machines) is contained in
  1660. * arm/filter_neon.c. It need not be defined - the generic code will be used
  1661. * if not.
  1662. */
  1663. #endif
  1664. /* Maintainer: Put new private prototypes here ^ */
  1665. //#include "pngdebug.h"
  1666. #endif /* PNG_VERSION_INFO_ONLY */
  1667. #endif /* PNGPRIV_H */