pngpriv.h 88 KB

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  1. /* pngpriv.h - private declarations for use inside libpng
  2. *
  3. * Copyright (c) 2018-2019 Cosmin Truta
  4. * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
  5. * Copyright (c) 1996-1997 Andreas Dilger
  6. * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
  7. *
  8. * This code is released under the libpng license.
  9. * For conditions of distribution and use, see the disclaimer
  10. * and license in png.h
  11. */
  12. /* The symbols declared in this file (including the functions declared
  13. * as extern) are PRIVATE. They are not part of the libpng public
  14. * interface, and are not recommended for use by regular applications.
  15. * Some of them may become public in the future; others may stay private,
  16. * change in an incompatible way, or even disappear.
  17. * Although the libpng users are not forbidden to include this header,
  18. * they should be well aware of the issues that may arise from doing so.
  19. */
  20. #ifndef PNGPRIV_H
  21. #define PNGPRIV_H
  22. /* Feature Test Macros. The following are defined here to ensure that correctly
  23. * implemented libraries reveal the APIs libpng needs to build and hide those
  24. * that are not needed and potentially damaging to the compilation.
  25. *
  26. * Feature Test Macros must be defined before any system header is included (see
  27. * POSIX 1003.1 2.8.2 "POSIX Symbols."
  28. *
  29. * These macros only have an effect if the operating system supports either
  30. * POSIX 1003.1 or C99, or both. On other operating systems (particularly
  31. * Windows/Visual Studio) there is no effect; the OS specific tests below are
  32. * still required (as of 2011-05-02.)
  33. */
  34. #ifndef _POSIX_SOURCE
  35. # define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */
  36. #endif
  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. /* Compile time options.
  80. * =====================
  81. * In a multi-arch build the compiler may compile the code several times for the
  82. * same object module, producing different binaries for different architectures.
  83. * When this happens configure-time setting of the target host options cannot be
  84. * done and this interferes with the handling of the ARM NEON optimizations, and
  85. * possibly other similar optimizations. Put additional tests here; in general
  86. * this is needed when the same option can be changed at both compile time and
  87. * run time depending on the target OS (i.e. iOS vs Android.)
  88. *
  89. * NOTE: symbol prefixing does not pass $(CFLAGS) to the preprocessor, because
  90. * this is not possible with certain compilers (Oracle SUN OS CC), as a result
  91. * it is necessary to ensure that all extern functions that *might* be used
  92. * regardless of $(CFLAGS) get declared in this file. The test on __ARM_NEON__
  93. * below is one example of this behavior because it is controlled by the
  94. * presence or not of -mfpu=neon on the GCC command line, it is possible to do
  95. * this in $(CC), e.g. "CC=gcc -mfpu=neon", but people who build libpng rarely
  96. * do this.
  97. */
  98. #ifndef PNG_ARM_NEON_OPT
  99. /* ARM NEON optimizations are being controlled by the compiler settings,
  100. * typically the target FPU. If the FPU has been set to NEON (-mfpu=neon
  101. * with GCC) then the compiler will define __ARM_NEON__ and we can rely
  102. * unconditionally on NEON instructions not crashing, otherwise we must
  103. * disable use of NEON instructions.
  104. *
  105. * NOTE: at present these optimizations depend on 'ALIGNED_MEMORY', so they
  106. * can only be turned on automatically if that is supported too. If
  107. * PNG_ARM_NEON_OPT is set in CPPFLAGS (to >0) then arm/arm_init.c will fail
  108. * to compile with an appropriate #error if ALIGNED_MEMORY has been turned
  109. * off.
  110. *
  111. * Note that gcc-4.9 defines __ARM_NEON instead of the deprecated
  112. * __ARM_NEON__, so we check both variants.
  113. *
  114. * To disable ARM_NEON optimizations entirely, and skip compiling the
  115. * associated assembler code, pass --enable-arm-neon=no to configure
  116. * or put -DPNG_ARM_NEON_OPT=0 in CPPFLAGS.
  117. */
  118. # if (defined(__ARM_NEON__) || defined(__ARM_NEON)) && \
  119. defined(PNG_ALIGNED_MEMORY_SUPPORTED)
  120. # define PNG_ARM_NEON_OPT 2
  121. # else
  122. # define PNG_ARM_NEON_OPT 0
  123. # endif
  124. #endif
  125. #if PNG_ARM_NEON_OPT > 0
  126. /* NEON optimizations are to be at least considered by libpng, so enable the
  127. * callbacks to do this.
  128. */
  129. # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_neon
  130. /* By default the 'intrinsics' code in arm/filter_neon_intrinsics.c is used
  131. * if possible - if __ARM_NEON__ is set and the compiler version is not known
  132. * to be broken. This is controlled by PNG_ARM_NEON_IMPLEMENTATION which can
  133. * be:
  134. *
  135. * 1 The intrinsics code (the default with __ARM_NEON__)
  136. * 2 The hand coded assembler (the default without __ARM_NEON__)
  137. *
  138. * It is possible to set PNG_ARM_NEON_IMPLEMENTATION in CPPFLAGS, however
  139. * this is *NOT* supported and may cease to work even after a minor revision
  140. * to libpng. It *is* valid to do this for testing purposes, e.g. speed
  141. * testing or a new compiler, but the results should be communicated to the
  142. * libpng implementation list for incorporation in the next minor release.
  143. */
  144. # ifndef PNG_ARM_NEON_IMPLEMENTATION
  145. # if defined(__ARM_NEON__) || defined(__ARM_NEON)
  146. # if defined(__clang__)
  147. /* At present it is unknown by the libpng developers which versions
  148. * of clang support the intrinsics, however some or perhaps all
  149. * versions do not work with the assembler so this may be
  150. * irrelevant, so just use the default (do nothing here.)
  151. */
  152. # elif defined(__GNUC__)
  153. /* GCC 4.5.4 NEON support is known to be broken. 4.6.3 is known to
  154. * work, so if this *is* GCC, or G++, look for a version >4.5
  155. */
  156. # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)
  157. # define PNG_ARM_NEON_IMPLEMENTATION 2
  158. # endif /* no GNUC support */
  159. # endif /* __GNUC__ */
  160. # else /* !defined __ARM_NEON__ */
  161. /* The 'intrinsics' code simply won't compile without this -mfpu=neon:
  162. */
  163. # if !defined(__aarch64__)
  164. /* The assembler code currently does not work on ARM64 */
  165. # define PNG_ARM_NEON_IMPLEMENTATION 2
  166. # endif /* __aarch64__ */
  167. # endif /* __ARM_NEON__ */
  168. # endif /* !PNG_ARM_NEON_IMPLEMENTATION */
  169. # ifndef PNG_ARM_NEON_IMPLEMENTATION
  170. /* Use the intrinsics code by default. */
  171. # define PNG_ARM_NEON_IMPLEMENTATION 1
  172. # endif
  173. #endif /* PNG_ARM_NEON_OPT > 0 */
  174. #ifndef PNG_MIPS_MSA_OPT
  175. # if defined(__mips_msa) && (__mips_isa_rev >= 5) && defined(PNG_ALIGNED_MEMORY_SUPPORTED)
  176. # define PNG_MIPS_MSA_OPT 2
  177. # else
  178. # define PNG_MIPS_MSA_OPT 0
  179. # endif
  180. #endif
  181. #ifndef PNG_POWERPC_VSX_OPT
  182. # if defined(__PPC64__) && defined(__ALTIVEC__) && defined(__VSX__)
  183. # define PNG_POWERPC_VSX_OPT 2
  184. # else
  185. # define PNG_POWERPC_VSX_OPT 0
  186. # endif
  187. #endif
  188. #ifndef PNG_INTEL_SSE_OPT
  189. # ifdef PNG_INTEL_SSE
  190. /* Only check for SSE if the build configuration has been modified to
  191. * enable SSE optimizations. This means that these optimizations will
  192. * be off by default. See contrib/intel for more details.
  193. */
  194. # if defined(__SSE4_1__) || defined(__AVX__) || defined(__SSSE3__) || \
  195. defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \
  196. (defined(_M_IX86_FP) && _M_IX86_FP >= 2)
  197. # define PNG_INTEL_SSE_OPT 1
  198. # else
  199. # define PNG_INTEL_SSE_OPT 0
  200. # endif
  201. # else
  202. # define PNG_INTEL_SSE_OPT 0
  203. # endif
  204. #endif
  205. #if PNG_INTEL_SSE_OPT > 0
  206. # ifndef PNG_INTEL_SSE_IMPLEMENTATION
  207. # if defined(__SSE4_1__) || defined(__AVX__)
  208. /* We are not actually using AVX, but checking for AVX is the best
  209. way we can detect SSE4.1 and SSSE3 on MSVC.
  210. */
  211. # define PNG_INTEL_SSE_IMPLEMENTATION 3
  212. # elif defined(__SSSE3__)
  213. # define PNG_INTEL_SSE_IMPLEMENTATION 2
  214. # elif defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \
  215. (defined(_M_IX86_FP) && _M_IX86_FP >= 2)
  216. # define PNG_INTEL_SSE_IMPLEMENTATION 1
  217. # else
  218. # define PNG_INTEL_SSE_IMPLEMENTATION 0
  219. # endif
  220. # endif
  221. # if PNG_INTEL_SSE_IMPLEMENTATION > 0
  222. # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_sse2
  223. # endif
  224. #else
  225. # define PNG_INTEL_SSE_IMPLEMENTATION 0
  226. #endif
  227. #if PNG_MIPS_MSA_OPT > 0
  228. # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_msa
  229. # ifndef PNG_MIPS_MSA_IMPLEMENTATION
  230. # if defined(__mips_msa)
  231. # if defined(__clang__)
  232. # elif defined(__GNUC__)
  233. # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7)
  234. # define PNG_MIPS_MSA_IMPLEMENTATION 2
  235. # endif /* no GNUC support */
  236. # endif /* __GNUC__ */
  237. # else /* !defined __mips_msa */
  238. # define PNG_MIPS_MSA_IMPLEMENTATION 2
  239. # endif /* __mips_msa */
  240. # endif /* !PNG_MIPS_MSA_IMPLEMENTATION */
  241. # ifndef PNG_MIPS_MSA_IMPLEMENTATION
  242. # define PNG_MIPS_MSA_IMPLEMENTATION 1
  243. # endif
  244. #endif /* PNG_MIPS_MSA_OPT > 0 */
  245. #if PNG_POWERPC_VSX_OPT > 0
  246. # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_vsx
  247. # define PNG_POWERPC_VSX_IMPLEMENTATION 1
  248. #endif
  249. /* Is this a build of a DLL where compilation of the object modules requires
  250. * different preprocessor settings to those required for a simple library? If
  251. * so PNG_BUILD_DLL must be set.
  252. *
  253. * If libpng is used inside a DLL but that DLL does not export the libpng APIs
  254. * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a
  255. * static library of libpng then link the DLL against that.
  256. */
  257. #ifndef PNG_BUILD_DLL
  258. # ifdef DLL_EXPORT
  259. /* This is set by libtool when files are compiled for a DLL; libtool
  260. * always compiles twice, even on systems where it isn't necessary. Set
  261. * PNG_BUILD_DLL in case it is necessary:
  262. */
  263. # define PNG_BUILD_DLL
  264. # else
  265. # ifdef _WINDLL
  266. /* This is set by the Microsoft Visual Studio IDE in projects that
  267. * build a DLL. It can't easily be removed from those projects (it
  268. * isn't visible in the Visual Studio UI) so it is a fairly reliable
  269. * indication that PNG_IMPEXP needs to be set to the DLL export
  270. * attributes.
  271. */
  272. # define PNG_BUILD_DLL
  273. # else
  274. # ifdef __DLL__
  275. /* This is set by the Borland C system when compiling for a DLL
  276. * (as above.)
  277. */
  278. # define PNG_BUILD_DLL
  279. # else
  280. /* Add additional compiler cases here. */
  281. # endif
  282. # endif
  283. # endif
  284. #endif /* Setting PNG_BUILD_DLL if required */
  285. /* See pngconf.h for more details: the builder of the library may set this on
  286. * the command line to the right thing for the specific compilation system or it
  287. * may be automagically set above (at present we know of no system where it does
  288. * need to be set on the command line.)
  289. *
  290. * PNG_IMPEXP must be set here when building the library to prevent pngconf.h
  291. * setting it to the "import" setting for a DLL build.
  292. */
  293. #ifndef PNG_IMPEXP
  294. # ifdef PNG_BUILD_DLL
  295. # define PNG_IMPEXP PNG_DLL_EXPORT
  296. # else
  297. /* Not building a DLL, or the DLL doesn't require specific export
  298. * definitions.
  299. */
  300. # define PNG_IMPEXP
  301. # endif
  302. #endif
  303. /* No warnings for private or deprecated functions in the build: */
  304. #ifndef PNG_DEPRECATED
  305. # define PNG_DEPRECATED
  306. #endif
  307. #ifndef PNG_PRIVATE
  308. # define PNG_PRIVATE
  309. #endif
  310. /* Symbol preprocessing support.
  311. *
  312. * To enable listing global, but internal, symbols the following macros should
  313. * always be used to declare an extern data or function object in this file.
  314. */
  315. #ifndef PNG_INTERNAL_DATA
  316. # define PNG_INTERNAL_DATA(type, name, array) PNG_LINKAGE_DATA type name array
  317. #endif
  318. #ifndef PNG_INTERNAL_FUNCTION
  319. # define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\
  320. PNG_LINKAGE_FUNCTION PNG_FUNCTION(type, name, args, PNG_EMPTY attributes)
  321. #endif
  322. #ifndef PNG_INTERNAL_CALLBACK
  323. # define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\
  324. PNG_LINKAGE_CALLBACK PNG_FUNCTION(type, (PNGCBAPI name), args,\
  325. PNG_EMPTY attributes)
  326. #endif
  327. /* If floating or fixed point APIs are disabled they may still be compiled
  328. * internally. To handle this make sure they are declared as the appropriate
  329. * internal extern function (otherwise the symbol prefixing stuff won't work and
  330. * the functions will be used without definitions.)
  331. *
  332. * NOTE: although all the API functions are declared here they are not all
  333. * actually built! Because the declarations are still made it is necessary to
  334. * fake out types that they depend on.
  335. */
  336. #ifndef PNG_FP_EXPORT
  337. # ifndef PNG_FLOATING_POINT_SUPPORTED
  338. # define PNG_FP_EXPORT(ordinal, type, name, args)\
  339. PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
  340. # ifndef PNG_VERSION_INFO_ONLY
  341. typedef struct png_incomplete png_double;
  342. typedef png_double* png_doublep;
  343. typedef const png_double* png_const_doublep;
  344. typedef png_double** png_doublepp;
  345. # endif
  346. # endif
  347. #endif
  348. #ifndef PNG_FIXED_EXPORT
  349. # ifndef PNG_FIXED_POINT_SUPPORTED
  350. # define PNG_FIXED_EXPORT(ordinal, type, name, args)\
  351. PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
  352. # endif
  353. #endif
  354. #include "png.h"
  355. /* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */
  356. #ifndef PNG_DLL_EXPORT
  357. # define PNG_DLL_EXPORT
  358. #endif
  359. /* This is a global switch to set the compilation for an installed system
  360. * (a release build). It can be set for testing debug builds to ensure that
  361. * they will compile when the build type is switched to RC or STABLE, the
  362. * default is just to use PNG_LIBPNG_BUILD_BASE_TYPE. Set this in CPPFLAGS
  363. * with either:
  364. *
  365. * -DPNG_RELEASE_BUILD Turns on the release compile path
  366. * -DPNG_RELEASE_BUILD=0 Turns it off
  367. * or in your pngusr.h with
  368. * #define PNG_RELEASE_BUILD=1 Turns on the release compile path
  369. * #define PNG_RELEASE_BUILD=0 Turns it off
  370. */
  371. #ifndef PNG_RELEASE_BUILD
  372. # define PNG_RELEASE_BUILD (PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC)
  373. #endif
  374. /* SECURITY and SAFETY:
  375. *
  376. * libpng is built with support for internal limits on image dimensions and
  377. * memory usage. These are documented in scripts/pnglibconf.dfa of the
  378. * source and recorded in the machine generated header file pnglibconf.h.
  379. */
  380. /* If you are running on a machine where you cannot allocate more
  381. * than 64K of memory at once, uncomment this. While libpng will not
  382. * normally need that much memory in a chunk (unless you load up a very
  383. * large file), zlib needs to know how big of a chunk it can use, and
  384. * libpng thus makes sure to check any memory allocation to verify it
  385. * will fit into memory.
  386. *
  387. * zlib provides 'MAXSEG_64K' which, if defined, indicates the
  388. * same limit and pngconf.h (already included) sets the limit
  389. * if certain operating systems are detected.
  390. */
  391. #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
  392. # define PNG_MAX_MALLOC_64K
  393. #endif
  394. #ifndef PNG_UNUSED
  395. /* Unused formal parameter warnings are silenced using the following macro
  396. * which is expected to have no bad effects on performance (optimizing
  397. * compilers will probably remove it entirely). Note that if you replace
  398. * it with something other than whitespace, you must include the terminating
  399. * semicolon.
  400. */
  401. # define PNG_UNUSED(param) (void)param;
  402. #endif
  403. /* Just a little check that someone hasn't tried to define something
  404. * contradictory.
  405. */
  406. #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K)
  407. # undef PNG_ZBUF_SIZE
  408. # define PNG_ZBUF_SIZE 65536L
  409. #endif
  410. /* If warnings or errors are turned off the code is disabled or redirected here.
  411. * From 1.5.4 functions have been added to allow very limited formatting of
  412. * error and warning messages - this code will also be disabled here.
  413. */
  414. #ifdef PNG_WARNINGS_SUPPORTED
  415. # define PNG_WARNING_PARAMETERS(p) png_warning_parameters p;
  416. #else
  417. # define png_warning_parameter(p,number,string) ((void)0)
  418. # define png_warning_parameter_unsigned(p,number,format,value) ((void)0)
  419. # define png_warning_parameter_signed(p,number,format,value) ((void)0)
  420. # define png_formatted_warning(pp,p,message) ((void)(pp))
  421. # define PNG_WARNING_PARAMETERS(p)
  422. #endif
  423. #ifndef PNG_ERROR_TEXT_SUPPORTED
  424. # define png_fixed_error(s1,s2) png_err(s1)
  425. #endif
  426. /* Some fixed point APIs are still required even if not exported because
  427. * they get used by the corresponding floating point APIs. This magic
  428. * deals with this:
  429. */
  430. #ifdef PNG_FIXED_POINT_SUPPORTED
  431. # define PNGFAPI PNGAPI
  432. #else
  433. # define PNGFAPI /* PRIVATE */
  434. #endif
  435. #ifndef PNG_VERSION_INFO_ONLY
  436. /* Other defines specific to compilers can go here. Try to keep
  437. * them inside an appropriate ifdef/endif pair for portability.
  438. */
  439. /* C allows up-casts from (void*) to any pointer and (const void*) to any
  440. * pointer to a const object. C++ regards this as a type error and requires an
  441. * explicit, static, cast and provides the static_cast<> rune to ensure that
  442. * const is not cast away.
  443. */
  444. #ifdef __cplusplus
  445. # define png_voidcast(type, value) static_cast<type>(value)
  446. # define png_constcast(type, value) const_cast<type>(value)
  447. # define png_aligncast(type, value) \
  448. static_cast<type>(static_cast<void*>(value))
  449. # define png_aligncastconst(type, value) \
  450. static_cast<type>(static_cast<const void*>(value))
  451. #else
  452. # define png_voidcast(type, value) (value)
  453. # ifdef _WIN64
  454. # ifdef __GNUC__
  455. typedef unsigned long long png_ptruint;
  456. # else
  457. typedef unsigned __int64 png_ptruint;
  458. # endif
  459. # else
  460. typedef unsigned long png_ptruint;
  461. # endif
  462. # define png_constcast(type, value) ((type)(png_ptruint)(const void*)(value))
  463. # define png_aligncast(type, value) ((void*)(value))
  464. # define png_aligncastconst(type, value) ((const void*)(value))
  465. #endif /* __cplusplus */
  466. #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\
  467. defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
  468. /* png.c requires the following ANSI-C constants if the conversion of
  469. * floating point to ASCII is implemented therein:
  470. *
  471. * DBL_DIG Maximum number of decimal digits (can be set to any constant)
  472. * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value)
  473. * DBL_MAX Maximum floating point number (can be set to an arbitrary value)
  474. */
  475. # include <float.h>
  476. # if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
  477. defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
  478. /* We need to check that <math.h> hasn't already been included earlier
  479. * as it seems it doesn't agree with <fp.h>, yet we should really use
  480. * <fp.h> if possible.
  481. */
  482. # if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
  483. # include <fp.h>
  484. # endif
  485. # else
  486. # include <math.h>
  487. # endif
  488. # if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
  489. /* Amiga SAS/C: We must include builtin FPU functions when compiling using
  490. * MATH=68881
  491. */
  492. # include <m68881.h>
  493. # endif
  494. #endif
  495. /* This provides the non-ANSI (far) memory allocation routines. */
  496. #if defined(__TURBOC__) && defined(__MSDOS__)
  497. # include <mem.h>
  498. # include <alloc.h>
  499. #endif
  500. #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \
  501. defined(_WIN32) || defined(__WIN32__)
  502. # include <windows.h> /* defines _WINDOWS_ macro */
  503. #endif
  504. #endif /* PNG_VERSION_INFO_ONLY */
  505. /* Moved here around 1.5.0beta36 from pngconf.h */
  506. /* Users may want to use these so they are not private. Any library
  507. * functions that are passed far data must be model-independent.
  508. */
  509. /* Memory model/platform independent fns */
  510. #ifndef PNG_ABORT
  511. # ifdef _WINDOWS_
  512. # define PNG_ABORT() ExitProcess(0)
  513. # else
  514. # define PNG_ABORT() abort()
  515. # endif
  516. #endif
  517. /* These macros may need to be architecture dependent. */
  518. #define PNG_ALIGN_NONE 0 /* do not use data alignment */
  519. #define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */
  520. #ifdef offsetof
  521. # define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */
  522. #else
  523. # define PNG_ALIGN_OFFSET -1 /* prevent the use of this */
  524. #endif
  525. #define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */
  526. #ifndef PNG_ALIGN_TYPE
  527. /* Default to using aligned access optimizations and requiring alignment to a
  528. * multiple of the data type size. Override in a compiler specific fashion
  529. * if necessary by inserting tests here:
  530. */
  531. # define PNG_ALIGN_TYPE PNG_ALIGN_SIZE
  532. #endif
  533. #if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE
  534. /* This is used because in some compiler implementations non-aligned
  535. * structure members are supported, so the offsetof approach below fails.
  536. * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access
  537. * is good for performance. Do not do this unless you have tested the result
  538. * and understand it.
  539. */
  540. # define png_alignof(type) (sizeof (type))
  541. #else
  542. # if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET
  543. # define png_alignof(type) offsetof(struct{char c; type t;}, t)
  544. # else
  545. # if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS
  546. # define png_alignof(type) (1)
  547. # endif
  548. /* Else leave png_alignof undefined to prevent use thereof */
  549. # endif
  550. #endif
  551. /* This implicitly assumes alignment is always to a power of 2. */
  552. #ifdef png_alignof
  553. # define png_isaligned(ptr, type)\
  554. (((type)((const char*)ptr-(const char*)0) & \
  555. (type)(png_alignof(type)-1)) == 0)
  556. #else
  557. # define png_isaligned(ptr, type) 0
  558. #endif
  559. /* End of memory model/platform independent support */
  560. /* End of 1.5.0beta36 move from pngconf.h */
  561. /* CONSTANTS and UTILITY MACROS
  562. * These are used internally by libpng and not exposed in the API
  563. */
  564. /* Various modes of operation. Note that after an init, mode is set to
  565. * zero automatically when the structure is created. Three of these
  566. * are defined in png.h because they need to be visible to applications
  567. * that call png_set_unknown_chunk().
  568. */
  569. /* #define PNG_HAVE_IHDR 0x01U (defined in png.h) */
  570. /* #define PNG_HAVE_PLTE 0x02U (defined in png.h) */
  571. #define PNG_HAVE_IDAT 0x04U
  572. /* #define PNG_AFTER_IDAT 0x08U (defined in png.h) */
  573. #define PNG_HAVE_IEND 0x10U
  574. /* 0x20U (unused) */
  575. /* 0x40U (unused) */
  576. /* 0x80U (unused) */
  577. #define PNG_HAVE_CHUNK_HEADER 0x100U
  578. #define PNG_WROTE_tIME 0x200U
  579. #define PNG_WROTE_INFO_BEFORE_PLTE 0x400U
  580. #define PNG_BACKGROUND_IS_GRAY 0x800U
  581. #define PNG_HAVE_PNG_SIGNATURE 0x1000U
  582. #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000U /* Have another chunk after IDAT */
  583. /* 0x4000U (unused) */
  584. #define PNG_IS_READ_STRUCT 0x8000U /* Else is a write struct */
  585. /* Flags for the transformations the PNG library does on the image data */
  586. #define PNG_BGR 0x0001U
  587. #define PNG_INTERLACE 0x0002U
  588. #define PNG_PACK 0x0004U
  589. #define PNG_SHIFT 0x0008U
  590. #define PNG_SWAP_BYTES 0x0010U
  591. #define PNG_INVERT_MONO 0x0020U
  592. #define PNG_QUANTIZE 0x0040U
  593. #define PNG_COMPOSE 0x0080U /* Was PNG_BACKGROUND */
  594. #define PNG_BACKGROUND_EXPAND 0x0100U
  595. #define PNG_EXPAND_16 0x0200U /* Added to libpng 1.5.2 */
  596. #define PNG_16_TO_8 0x0400U /* Becomes 'chop' in 1.5.4 */
  597. #define PNG_RGBA 0x0800U
  598. #define PNG_EXPAND 0x1000U
  599. #define PNG_GAMMA 0x2000U
  600. #define PNG_GRAY_TO_RGB 0x4000U
  601. #define PNG_FILLER 0x8000U
  602. #define PNG_PACKSWAP 0x10000U
  603. #define PNG_SWAP_ALPHA 0x20000U
  604. #define PNG_STRIP_ALPHA 0x40000U
  605. #define PNG_INVERT_ALPHA 0x80000U
  606. #define PNG_USER_TRANSFORM 0x100000U
  607. #define PNG_RGB_TO_GRAY_ERR 0x200000U
  608. #define PNG_RGB_TO_GRAY_WARN 0x400000U
  609. #define PNG_RGB_TO_GRAY 0x600000U /* two bits, RGB_TO_GRAY_ERR|WARN */
  610. #define PNG_ENCODE_ALPHA 0x800000U /* Added to libpng-1.5.4 */
  611. #define PNG_ADD_ALPHA 0x1000000U /* Added to libpng-1.2.7 */
  612. #define PNG_EXPAND_tRNS 0x2000000U /* Added to libpng-1.2.9 */
  613. #define PNG_SCALE_16_TO_8 0x4000000U /* Added to libpng-1.5.4 */
  614. /* 0x8000000U unused */
  615. /* 0x10000000U unused */
  616. /* 0x20000000U unused */
  617. /* 0x40000000U unused */
  618. /* Flags for png_create_struct */
  619. #define PNG_STRUCT_PNG 0x0001U
  620. #define PNG_STRUCT_INFO 0x0002U
  621. /* Flags for the png_ptr->flags rather than declaring a byte for each one */
  622. #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001U
  623. #define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002U /* Added to libpng-1.6.0 */
  624. /* 0x0004U unused */
  625. #define PNG_FLAG_ZSTREAM_ENDED 0x0008U /* Added to libpng-1.6.0 */
  626. /* 0x0010U unused */
  627. /* 0x0020U unused */
  628. #define PNG_FLAG_ROW_INIT 0x0040U
  629. #define PNG_FLAG_FILLER_AFTER 0x0080U
  630. #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100U
  631. #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200U
  632. #define PNG_FLAG_CRC_CRITICAL_USE 0x0400U
  633. #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800U
  634. #define PNG_FLAG_ASSUME_sRGB 0x1000U /* Added to libpng-1.5.4 */
  635. #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000U /* Added to libpng-1.5.4 */
  636. #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000U /* Added to libpng-1.5.4 */
  637. /* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000U */
  638. /* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000U */
  639. #define PNG_FLAG_LIBRARY_MISMATCH 0x20000U
  640. #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000U
  641. #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000U
  642. #define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000U /* Added to libpng-1.4.0 */
  643. #define PNG_FLAG_APP_WARNINGS_WARN 0x200000U /* Added to libpng-1.6.0 */
  644. #define PNG_FLAG_APP_ERRORS_WARN 0x400000U /* Added to libpng-1.6.0 */
  645. /* 0x800000U unused */
  646. /* 0x1000000U unused */
  647. /* 0x2000000U unused */
  648. /* 0x4000000U unused */
  649. /* 0x8000000U unused */
  650. /* 0x10000000U unused */
  651. /* 0x20000000U unused */
  652. /* 0x40000000U unused */
  653. #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
  654. PNG_FLAG_CRC_ANCILLARY_NOWARN)
  655. #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
  656. PNG_FLAG_CRC_CRITICAL_IGNORE)
  657. #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
  658. PNG_FLAG_CRC_CRITICAL_MASK)
  659. /* Save typing and make code easier to understand */
  660. #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
  661. abs((int)((c1).green) - (int)((c2).green)) + \
  662. abs((int)((c1).blue) - (int)((c2).blue)))
  663. /* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255
  664. * by dividing by 257 *with rounding*. This macro is exact for the given range.
  665. * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the
  666. * macro were established by experiment (modifying the added value). The macro
  667. * has a second variant that takes a value already scaled by 255 and divides by
  668. * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it
  669. * only gives off-by-one errors and only for 0.5% (1 in 200) of the values.
  670. */
  671. #define PNG_DIV65535(v24) (((v24) + 32895) >> 16)
  672. #define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255)
  673. /* Added to libpng-1.2.6 JB */
  674. #define PNG_ROWBYTES(pixel_bits, width) \
  675. ((pixel_bits) >= 8 ? \
  676. ((size_t)(width) * (((size_t)(pixel_bits)) >> 3)) : \
  677. (( ((size_t)(width) * ((size_t)(pixel_bits))) + 7) >> 3) )
  678. /* This returns the number of trailing bits in the last byte of a row, 0 if the
  679. * last byte is completely full of pixels. It is, in principle, (pixel_bits x
  680. * width) % 8, but that would overflow for large 'width'. The second macro is
  681. * the same except that it returns the number of unused bits in the last byte;
  682. * (8-TRAILBITS), but 0 when TRAILBITS is 0.
  683. *
  684. * NOTE: these macros are intended to be self-evidently correct and never
  685. * overflow on the assumption that pixel_bits is in the range 0..255. The
  686. * arguments are evaluated only once and they can be signed (e.g. as a result of
  687. * the integral promotions). The result of the expression always has type
  688. * (png_uint_32), however the compiler always knows it is in the range 0..7.
  689. */
  690. #define PNG_TRAILBITS(pixel_bits, width) \
  691. (((pixel_bits) * ((width) % (png_uint_32)8)) % 8)
  692. #define PNG_PADBITS(pixel_bits, width) \
  693. ((8 - PNG_TRAILBITS(pixel_bits, width)) % 8)
  694. /* PNG_OUT_OF_RANGE returns true if value is outside the range
  695. * ideal-delta..ideal+delta. Each argument is evaluated twice.
  696. * "ideal" and "delta" should be constants, normally simple
  697. * integers, "value" a variable. Added to libpng-1.2.6 JB
  698. */
  699. #define PNG_OUT_OF_RANGE(value, ideal, delta) \
  700. ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
  701. /* Conversions between fixed and floating point, only defined if
  702. * required (to make sure the code doesn't accidentally use float
  703. * when it is supposedly disabled.)
  704. */
  705. #ifdef PNG_FLOATING_POINT_SUPPORTED
  706. /* The floating point conversion can't overflow, though it can and
  707. * does lose accuracy relative to the original fixed point value.
  708. * In practice this doesn't matter because png_fixed_point only
  709. * stores numbers with very low precision. The png_ptr and s
  710. * arguments are unused by default but are there in case error
  711. * checking becomes a requirement.
  712. */
  713. #define png_float(png_ptr, fixed, s) (.00001 * (fixed))
  714. /* The fixed point conversion performs range checking and evaluates
  715. * its argument multiple times, so must be used with care. The
  716. * range checking uses the PNG specification values for a signed
  717. * 32-bit fixed point value except that the values are deliberately
  718. * rounded-to-zero to an integral value - 21474 (21474.83 is roughly
  719. * (2^31-1) * 100000). 's' is a string that describes the value being
  720. * converted.
  721. *
  722. * NOTE: this macro will raise a png_error if the range check fails,
  723. * therefore it is normally only appropriate to use this on values
  724. * that come from API calls or other sources where an out of range
  725. * error indicates a programming error, not a data error!
  726. *
  727. * NOTE: by default this is off - the macro is not used - because the
  728. * function call saves a lot of code.
  729. */
  730. #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED
  731. #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\
  732. ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0))
  733. #endif
  734. /* else the corresponding function is defined below, inside the scope of the
  735. * cplusplus test.
  736. */
  737. #endif
  738. /* Constants for known chunk types. If you need to add a chunk, define the name
  739. * here. For historical reasons these constants have the form png_<name>; i.e.
  740. * the prefix is lower case. Please use decimal values as the parameters to
  741. * match the ISO PNG specification and to avoid relying on the C locale
  742. * interpretation of character values.
  743. *
  744. * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values
  745. * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string
  746. * to be generated if required.
  747. *
  748. * PNG_32b correctly produces a value shifted by up to 24 bits, even on
  749. * architectures where (int) is only 16 bits.
  750. */
  751. #define PNG_32b(b,s) ((png_uint_32)(b) << (s))
  752. #define PNG_U32(b1,b2,b3,b4) \
  753. (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0))
  754. /* Constants for known chunk types.
  755. *
  756. * MAINTAINERS: If you need to add a chunk, define the name here.
  757. * For historical reasons these constants have the form png_<name>; i.e.
  758. * the prefix is lower case. Please use decimal values as the parameters to
  759. * match the ISO PNG specification and to avoid relying on the C locale
  760. * interpretation of character values. Please keep the list sorted.
  761. *
  762. * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk
  763. * type. In fact the specification does not express chunk types this way,
  764. * however using a 32-bit value means that the chunk type can be read from the
  765. * stream using exactly the same code as used for a 32-bit unsigned value and
  766. * can be examined far more efficiently (using one arithmetic compare).
  767. *
  768. * Prior to 1.5.6 the chunk type constants were expressed as C strings. The
  769. * libpng API still uses strings for 'unknown' chunks and a macro,
  770. * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice
  771. * that for portable code numeric values must still be used; the string "IHDR"
  772. * is not portable and neither is PNG_U32('I', 'H', 'D', 'R').
  773. *
  774. * In 1.7.0 the definitions will be made public in png.h to avoid having to
  775. * duplicate the same definitions in application code.
  776. */
  777. #define png_IDAT PNG_U32( 73, 68, 65, 84)
  778. #define png_IEND PNG_U32( 73, 69, 78, 68)
  779. #define png_IHDR PNG_U32( 73, 72, 68, 82)
  780. #define png_PLTE PNG_U32( 80, 76, 84, 69)
  781. #define png_bKGD PNG_U32( 98, 75, 71, 68)
  782. #define png_cHRM PNG_U32( 99, 72, 82, 77)
  783. #define png_eXIf PNG_U32(101, 88, 73, 102) /* registered July 2017 */
  784. #define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */
  785. #define png_gAMA PNG_U32(103, 65, 77, 65)
  786. #define png_gIFg PNG_U32(103, 73, 70, 103)
  787. #define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */
  788. #define png_gIFx PNG_U32(103, 73, 70, 120)
  789. #define png_hIST PNG_U32(104, 73, 83, 84)
  790. #define png_iCCP PNG_U32(105, 67, 67, 80)
  791. #define png_iTXt PNG_U32(105, 84, 88, 116)
  792. #define png_oFFs PNG_U32(111, 70, 70, 115)
  793. #define png_pCAL PNG_U32(112, 67, 65, 76)
  794. #define png_pHYs PNG_U32(112, 72, 89, 115)
  795. #define png_sBIT PNG_U32(115, 66, 73, 84)
  796. #define png_sCAL PNG_U32(115, 67, 65, 76)
  797. #define png_sPLT PNG_U32(115, 80, 76, 84)
  798. #define png_sRGB PNG_U32(115, 82, 71, 66)
  799. #define png_sTER PNG_U32(115, 84, 69, 82)
  800. #define png_tEXt PNG_U32(116, 69, 88, 116)
  801. #define png_tIME PNG_U32(116, 73, 77, 69)
  802. #define png_tRNS PNG_U32(116, 82, 78, 83)
  803. #define png_zTXt PNG_U32(122, 84, 88, 116)
  804. /* The following will work on (signed char*) strings, whereas the get_uint_32
  805. * macro will fail on top-bit-set values because of the sign extension.
  806. */
  807. #define PNG_CHUNK_FROM_STRING(s)\
  808. PNG_U32(0xff & (s)[0], 0xff & (s)[1], 0xff & (s)[2], 0xff & (s)[3])
  809. /* This uses (char), not (png_byte) to avoid warnings on systems where (char) is
  810. * signed and the argument is a (char[]) This macro will fail miserably on
  811. * systems where (char) is more than 8 bits.
  812. */
  813. #define PNG_STRING_FROM_CHUNK(s,c)\
  814. (void)(((char*)(s))[0]=(char)(((c)>>24) & 0xff), \
  815. ((char*)(s))[1]=(char)(((c)>>16) & 0xff),\
  816. ((char*)(s))[2]=(char)(((c)>>8) & 0xff), \
  817. ((char*)(s))[3]=(char)((c & 0xff)))
  818. /* Do the same but terminate with a null character. */
  819. #define PNG_CSTRING_FROM_CHUNK(s,c)\
  820. (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0)
  821. /* Test on flag values as defined in the spec (section 5.4): */
  822. #define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29))
  823. #define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c))
  824. #define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21))
  825. #define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13))
  826. #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5))
  827. /* Gamma values (new at libpng-1.5.4): */
  828. #define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */
  829. #define PNG_GAMMA_MAC_INVERSE 65909
  830. #define PNG_GAMMA_sRGB_INVERSE 45455
  831. /* Almost everything below is C specific; the #defines above can be used in
  832. * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot.
  833. */
  834. #ifndef PNG_VERSION_INFO_ONLY
  835. #include "pngstruct.h"
  836. #include "pnginfo.h"
  837. /* Validate the include paths - the include path used to generate pnglibconf.h
  838. * must match that used in the build, or we must be using pnglibconf.h.prebuilt:
  839. */
  840. #if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM
  841. # error ZLIB_VERNUM != PNG_ZLIB_VERNUM \
  842. "-I (include path) error: see the notes in pngpriv.h"
  843. /* This means that when pnglibconf.h was built the copy of zlib.h that it
  844. * used is not the same as the one being used here. Because the build of
  845. * libpng makes decisions to use inflateInit2 and inflateReset2 based on the
  846. * zlib version number and because this affects handling of certain broken
  847. * PNG files the -I directives must match.
  848. *
  849. * The most likely explanation is that you passed a -I in CFLAGS. This will
  850. * not work; all the preprocessor directives and in particular all the -I
  851. * directives must be in CPPFLAGS.
  852. */
  853. #endif
  854. /* This is used for 16-bit gamma tables -- only the top level pointers are
  855. * const; this could be changed:
  856. */
  857. typedef const png_uint_16p * png_const_uint_16pp;
  858. /* Added to libpng-1.5.7: sRGB conversion tables */
  859. #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
  860. defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
  861. #ifdef PNG_SIMPLIFIED_READ_SUPPORTED
  862. PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]);
  863. /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value,
  864. * 0..65535. This table gives the closest 16-bit answers (no errors).
  865. */
  866. #endif
  867. PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]);
  868. PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]);
  869. #define PNG_sRGB_FROM_LINEAR(linear) \
  870. ((png_byte)(0xff & ((png_sRGB_base[(linear)>>15] \
  871. + ((((linear) & 0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8)))
  872. /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB
  873. * encoded value with maximum error 0.646365. Note that the input is not a
  874. * 16-bit value; it has been multiplied by 255! */
  875. #endif /* SIMPLIFIED_READ/WRITE */
  876. /* Inhibit C++ name-mangling for libpng functions but not for system calls. */
  877. #ifdef __cplusplus
  878. extern "C" {
  879. #endif /* __cplusplus */
  880. /* Internal functions; these are not exported from a DLL however because they
  881. * are used within several of the C source files they have to be C extern.
  882. *
  883. * All of these functions must be declared with PNG_INTERNAL_FUNCTION.
  884. */
  885. /* Zlib support */
  886. #define PNG_UNEXPECTED_ZLIB_RETURN (-7)
  887. PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret),
  888. PNG_EMPTY);
  889. /* Used by the zlib handling functions to ensure that z_stream::msg is always
  890. * set before they return.
  891. */
  892. #ifdef PNG_WRITE_SUPPORTED
  893. PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr,
  894. png_compression_bufferp *list),PNG_EMPTY);
  895. /* Free the buffer list used by the compressed write code. */
  896. #endif
  897. #if defined(PNG_FLOATING_POINT_SUPPORTED) && \
  898. !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \
  899. (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \
  900. defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \
  901. defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \
  902. (defined(PNG_sCAL_SUPPORTED) && \
  903. defined(PNG_FLOATING_ARITHMETIC_SUPPORTED))
  904. PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr,
  905. double fp, png_const_charp text),PNG_EMPTY);
  906. #endif
  907. /* Check the user version string for compatibility, returns false if the version
  908. * numbers aren't compatible.
  909. */
  910. PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr,
  911. png_const_charp user_png_ver),PNG_EMPTY);
  912. /* Internal base allocator - no messages, NULL on failure to allocate. This
  913. * does, however, call the application provided allocator and that could call
  914. * png_error (although that would be a bug in the application implementation.)
  915. */
  916. PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr,
  917. png_alloc_size_t size),PNG_ALLOCATED);
  918. #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\
  919. defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED)
  920. /* Internal array allocator, outputs no error or warning messages on failure,
  921. * just returns NULL.
  922. */
  923. PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr,
  924. int nelements, size_t element_size),PNG_ALLOCATED);
  925. /* The same but an existing array is extended by add_elements. This function
  926. * also memsets the new elements to 0 and copies the old elements. The old
  927. * array is not freed or altered.
  928. */
  929. PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr,
  930. png_const_voidp array, int old_elements, int add_elements,
  931. size_t element_size),PNG_ALLOCATED);
  932. #endif /* text, sPLT or unknown chunks */
  933. /* Magic to create a struct when there is no struct to call the user supplied
  934. * memory allocators. Because error handling has not been set up the memory
  935. * handlers can't safely call png_error, but this is an obscure and undocumented
  936. * restriction so libpng has to assume that the 'free' handler, at least, might
  937. * call png_error.
  938. */
  939. PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct,
  940. (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
  941. png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn,
  942. png_free_ptr free_fn),PNG_ALLOCATED);
  943. /* Free memory from internal libpng struct */
  944. PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr),
  945. PNG_EMPTY);
  946. /* Free an allocated jmp_buf (always succeeds) */
  947. PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY);
  948. /* Function to allocate memory for zlib. PNGAPI is disallowed. */
  949. PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size),
  950. PNG_ALLOCATED);
  951. /* Function to free memory for zlib. PNGAPI is disallowed. */
  952. PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY);
  953. /* Next four functions are used internally as callbacks. PNGCBAPI is required
  954. * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to
  955. * PNGCBAPI at 1.5.0
  956. */
  957. PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr,
  958. png_bytep data, size_t length),PNG_EMPTY);
  959. #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
  960. PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr,
  961. png_bytep buffer, size_t length),PNG_EMPTY);
  962. #endif
  963. PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr,
  964. png_bytep data, size_t length),PNG_EMPTY);
  965. #ifdef PNG_WRITE_FLUSH_SUPPORTED
  966. # ifdef PNG_STDIO_SUPPORTED
  967. PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr),
  968. PNG_EMPTY);
  969. # endif
  970. #endif
  971. /* Reset the CRC variable */
  972. PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY);
  973. /* Write the "data" buffer to whatever output you are using */
  974. PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr,
  975. png_const_bytep data, size_t length),PNG_EMPTY);
  976. /* Read and check the PNG file signature */
  977. PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr,
  978. png_inforp info_ptr),PNG_EMPTY);
  979. /* Read the chunk header (length + type name) */
  980. PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr),
  981. PNG_EMPTY);
  982. /* Read data from whatever input you are using into the "data" buffer */
  983. PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data,
  984. size_t length),PNG_EMPTY);
  985. /* Read bytes into buf, and update png_ptr->crc */
  986. PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf,
  987. png_uint_32 length),PNG_EMPTY);
  988. /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
  989. PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr,
  990. png_uint_32 skip),PNG_EMPTY);
  991. /* Read the CRC from the file and compare it to the libpng calculated CRC */
  992. PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY);
  993. /* Calculate the CRC over a section of data. Note that we are only
  994. * passing a maximum of 64K on systems that have this as a memory limit,
  995. * since this is the maximum buffer size we can specify.
  996. */
  997. PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr,
  998. png_const_bytep ptr, size_t length),PNG_EMPTY);
  999. #ifdef PNG_WRITE_FLUSH_SUPPORTED
  1000. PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY);
  1001. #endif
  1002. /* Write various chunks */
  1003. /* Write the IHDR chunk, and update the png_struct with the necessary
  1004. * information.
  1005. */
  1006. PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr,
  1007. png_uint_32 width, png_uint_32 height, int bit_depth, int color_type,
  1008. int compression_method, int filter_method, int interlace_method),PNG_EMPTY);
  1009. PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr,
  1010. png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY);
  1011. PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr,
  1012. png_const_bytep row_data, png_alloc_size_t row_data_length, int flush),
  1013. PNG_EMPTY);
  1014. PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY);
  1015. #ifdef PNG_WRITE_gAMA_SUPPORTED
  1016. PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr,
  1017. png_fixed_point file_gamma),PNG_EMPTY);
  1018. #endif
  1019. #ifdef PNG_WRITE_sBIT_SUPPORTED
  1020. PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr,
  1021. png_const_color_8p sbit, int color_type),PNG_EMPTY);
  1022. #endif
  1023. #ifdef PNG_WRITE_cHRM_SUPPORTED
  1024. PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr,
  1025. const png_xy *xy), PNG_EMPTY);
  1026. /* The xy value must have been previously validated */
  1027. #endif
  1028. #ifdef PNG_WRITE_sRGB_SUPPORTED
  1029. PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr,
  1030. int intent),PNG_EMPTY);
  1031. #endif
  1032. #ifdef PNG_WRITE_eXIf_SUPPORTED
  1033. PNG_INTERNAL_FUNCTION(void,png_write_eXIf,(png_structrp png_ptr,
  1034. png_bytep exif, int num_exif),PNG_EMPTY);
  1035. #endif
  1036. #ifdef PNG_WRITE_iCCP_SUPPORTED
  1037. PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr,
  1038. png_const_charp name, png_const_bytep profile), PNG_EMPTY);
  1039. /* The profile must have been previously validated for correctness, the
  1040. * length comes from the first four bytes. Only the base, deflate,
  1041. * compression is supported.
  1042. */
  1043. #endif
  1044. #ifdef PNG_WRITE_sPLT_SUPPORTED
  1045. PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr,
  1046. png_const_sPLT_tp palette),PNG_EMPTY);
  1047. #endif
  1048. #ifdef PNG_WRITE_tRNS_SUPPORTED
  1049. PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr,
  1050. png_const_bytep trans, png_const_color_16p values, int number,
  1051. int color_type),PNG_EMPTY);
  1052. #endif
  1053. #ifdef PNG_WRITE_bKGD_SUPPORTED
  1054. PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr,
  1055. png_const_color_16p values, int color_type),PNG_EMPTY);
  1056. #endif
  1057. #ifdef PNG_WRITE_hIST_SUPPORTED
  1058. PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr,
  1059. png_const_uint_16p hist, int num_hist),PNG_EMPTY);
  1060. #endif
  1061. /* Chunks that have keywords */
  1062. #ifdef PNG_WRITE_tEXt_SUPPORTED
  1063. PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr,
  1064. png_const_charp key, png_const_charp text, size_t text_len),PNG_EMPTY);
  1065. #endif
  1066. #ifdef PNG_WRITE_zTXt_SUPPORTED
  1067. PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp
  1068. key, png_const_charp text, int compression),PNG_EMPTY);
  1069. #endif
  1070. #ifdef PNG_WRITE_iTXt_SUPPORTED
  1071. PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr,
  1072. int compression, png_const_charp key, png_const_charp lang,
  1073. png_const_charp lang_key, png_const_charp text),PNG_EMPTY);
  1074. #endif
  1075. #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */
  1076. PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr,
  1077. png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY);
  1078. #endif
  1079. #ifdef PNG_WRITE_oFFs_SUPPORTED
  1080. PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr,
  1081. png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY);
  1082. #endif
  1083. #ifdef PNG_WRITE_pCAL_SUPPORTED
  1084. PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr,
  1085. png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
  1086. png_const_charp units, png_charpp params),PNG_EMPTY);
  1087. #endif
  1088. #ifdef PNG_WRITE_pHYs_SUPPORTED
  1089. PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr,
  1090. png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
  1091. int unit_type),PNG_EMPTY);
  1092. #endif
  1093. #ifdef PNG_WRITE_tIME_SUPPORTED
  1094. PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr,
  1095. png_const_timep mod_time),PNG_EMPTY);
  1096. #endif
  1097. #ifdef PNG_WRITE_sCAL_SUPPORTED
  1098. PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr,
  1099. int unit, png_const_charp width, png_const_charp height),PNG_EMPTY);
  1100. #endif
  1101. /* Called when finished processing a row of data */
  1102. PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr),
  1103. PNG_EMPTY);
  1104. /* Internal use only. Called before first row of data */
  1105. PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr),
  1106. PNG_EMPTY);
  1107. /* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an
  1108. * array of png_ptr->width pixels. If the image is not interlaced or this
  1109. * is the final pass this just does a memcpy, otherwise the "display" flag
  1110. * is used to determine whether to copy pixels that are not in the current pass.
  1111. *
  1112. * Because 'png_do_read_interlace' (below) replicates pixels this allows this
  1113. * function to achieve the documented 'blocky' appearance during interlaced read
  1114. * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row'
  1115. * are not changed if they are not in the current pass, when display is 0.
  1116. *
  1117. * 'display' must be 0 or 1, otherwise the memcpy will be done regardless.
  1118. *
  1119. * The API always reads from the png_struct row buffer and always assumes that
  1120. * it is full width (png_do_read_interlace has already been called.)
  1121. *
  1122. * This function is only ever used to write to row buffers provided by the
  1123. * caller of the relevant libpng API and the row must have already been
  1124. * transformed by the read transformations.
  1125. *
  1126. * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed
  1127. * bitmasks for use within the code, otherwise runtime generated masks are used.
  1128. * The default is compile time masks.
  1129. */
  1130. #ifndef PNG_USE_COMPILE_TIME_MASKS
  1131. # define PNG_USE_COMPILE_TIME_MASKS 1
  1132. #endif
  1133. PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr,
  1134. png_bytep row, int display),PNG_EMPTY);
  1135. #ifdef PNG_READ_INTERLACING_SUPPORTED
  1136. /* Expand an interlaced row: the 'row_info' describes the pass data that has
  1137. * been read in and must correspond to the pixels in 'row', the pixels are
  1138. * expanded (moved apart) in 'row' to match the final layout, when doing this
  1139. * the pixels are *replicated* to the intervening space. This is essential for
  1140. * the correct operation of png_combine_row, above.
  1141. */
  1142. PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info,
  1143. png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY);
  1144. #endif
  1145. /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
  1146. #ifdef PNG_WRITE_INTERLACING_SUPPORTED
  1147. /* Grab pixels out of a row for an interlaced pass */
  1148. PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info,
  1149. png_bytep row, int pass),PNG_EMPTY);
  1150. #endif
  1151. /* Unfilter a row: check the filter value before calling this, there is no point
  1152. * calling it for PNG_FILTER_VALUE_NONE.
  1153. */
  1154. PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop
  1155. row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY);
  1156. #if PNG_ARM_NEON_OPT > 0
  1157. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info,
  1158. png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  1159. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop
  1160. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  1161. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop
  1162. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  1163. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop
  1164. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  1165. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop
  1166. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  1167. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop
  1168. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  1169. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop
  1170. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  1171. #endif
  1172. #if PNG_MIPS_MSA_OPT > 0
  1173. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_msa,(png_row_infop row_info,
  1174. png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  1175. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_msa,(png_row_infop
  1176. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  1177. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_msa,(png_row_infop
  1178. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  1179. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_msa,(png_row_infop
  1180. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  1181. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_msa,(png_row_infop
  1182. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  1183. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_msa,(png_row_infop
  1184. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  1185. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_msa,(png_row_infop
  1186. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  1187. #endif
  1188. #if PNG_POWERPC_VSX_OPT > 0
  1189. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_vsx,(png_row_infop row_info,
  1190. png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  1191. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_vsx,(png_row_infop
  1192. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  1193. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_vsx,(png_row_infop
  1194. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  1195. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_vsx,(png_row_infop
  1196. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  1197. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_vsx,(png_row_infop
  1198. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  1199. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_vsx,(png_row_infop
  1200. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  1201. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_vsx,(png_row_infop
  1202. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  1203. #endif
  1204. #if PNG_INTEL_SSE_IMPLEMENTATION > 0
  1205. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_sse2,(png_row_infop
  1206. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  1207. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_sse2,(png_row_infop
  1208. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  1209. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_sse2,(png_row_infop
  1210. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  1211. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_sse2,(png_row_infop
  1212. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  1213. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_sse2,(png_row_infop
  1214. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  1215. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_sse2,(png_row_infop
  1216. row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
  1217. #endif
  1218. /* Choose the best filter to use and filter the row data */
  1219. PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr,
  1220. png_row_infop row_info),PNG_EMPTY);
  1221. #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
  1222. PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr,
  1223. png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY);
  1224. /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer
  1225. * is NULL the function checks, instead, for the end of the stream. In this
  1226. * case a benign error will be issued if the stream end is not found or if
  1227. * extra data has to be consumed.
  1228. */
  1229. PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr),
  1230. PNG_EMPTY);
  1231. /* This cleans up when the IDAT LZ stream does not end when the last image
  1232. * byte is read; there is still some pending input.
  1233. */
  1234. PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr),
  1235. PNG_EMPTY);
  1236. /* Finish a row while reading, dealing with interlacing passes, etc. */
  1237. #endif /* SEQUENTIAL_READ */
  1238. /* Initialize the row buffers, etc. */
  1239. PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY);
  1240. #if ZLIB_VERNUM >= 0x1240
  1241. PNG_INTERNAL_FUNCTION(int,png_zlib_inflate,(png_structrp png_ptr, int flush),
  1242. PNG_EMPTY);
  1243. # define PNG_INFLATE(pp, flush) png_zlib_inflate(pp, flush)
  1244. #else /* Zlib < 1.2.4 */
  1245. # define PNG_INFLATE(pp, flush) inflate(&(pp)->zstream, flush)
  1246. #endif /* Zlib < 1.2.4 */
  1247. #ifdef PNG_READ_TRANSFORMS_SUPPORTED
  1248. /* Optional call to update the users info structure */
  1249. PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr,
  1250. png_inforp info_ptr),PNG_EMPTY);
  1251. #endif
  1252. /* Shared transform functions, defined in pngtran.c */
  1253. #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
  1254. defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
  1255. PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info,
  1256. png_bytep row, int at_start),PNG_EMPTY);
  1257. #endif
  1258. #ifdef PNG_16BIT_SUPPORTED
  1259. #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
  1260. PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info,
  1261. png_bytep row),PNG_EMPTY);
  1262. #endif
  1263. #endif
  1264. #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
  1265. defined(PNG_WRITE_PACKSWAP_SUPPORTED)
  1266. PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info,
  1267. png_bytep row),PNG_EMPTY);
  1268. #endif
  1269. #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
  1270. PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info,
  1271. png_bytep row),PNG_EMPTY);
  1272. #endif
  1273. #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
  1274. PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info,
  1275. png_bytep row),PNG_EMPTY);
  1276. #endif
  1277. /* The following decodes the appropriate chunks, and does error correction,
  1278. * then calls the appropriate callback for the chunk if it is valid.
  1279. */
  1280. /* Decode the IHDR chunk */
  1281. PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr,
  1282. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1283. PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr,
  1284. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1285. PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr,
  1286. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1287. #ifdef PNG_READ_bKGD_SUPPORTED
  1288. PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr,
  1289. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1290. #endif
  1291. #ifdef PNG_READ_cHRM_SUPPORTED
  1292. PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr,
  1293. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1294. #endif
  1295. #ifdef PNG_READ_eXIf_SUPPORTED
  1296. PNG_INTERNAL_FUNCTION(void,png_handle_eXIf,(png_structrp png_ptr,
  1297. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1298. #endif
  1299. #ifdef PNG_READ_gAMA_SUPPORTED
  1300. PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr,
  1301. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1302. #endif
  1303. #ifdef PNG_READ_hIST_SUPPORTED
  1304. PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr,
  1305. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1306. #endif
  1307. #ifdef PNG_READ_iCCP_SUPPORTED
  1308. PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr,
  1309. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1310. #endif /* READ_iCCP */
  1311. #ifdef PNG_READ_iTXt_SUPPORTED
  1312. PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr,
  1313. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1314. #endif
  1315. #ifdef PNG_READ_oFFs_SUPPORTED
  1316. PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr,
  1317. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1318. #endif
  1319. #ifdef PNG_READ_pCAL_SUPPORTED
  1320. PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr,
  1321. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1322. #endif
  1323. #ifdef PNG_READ_pHYs_SUPPORTED
  1324. PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr,
  1325. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1326. #endif
  1327. #ifdef PNG_READ_sBIT_SUPPORTED
  1328. PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr,
  1329. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1330. #endif
  1331. #ifdef PNG_READ_sCAL_SUPPORTED
  1332. PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr,
  1333. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1334. #endif
  1335. #ifdef PNG_READ_sPLT_SUPPORTED
  1336. PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr,
  1337. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1338. #endif /* READ_sPLT */
  1339. #ifdef PNG_READ_sRGB_SUPPORTED
  1340. PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr,
  1341. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1342. #endif
  1343. #ifdef PNG_READ_tEXt_SUPPORTED
  1344. PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr,
  1345. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1346. #endif
  1347. #ifdef PNG_READ_tIME_SUPPORTED
  1348. PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr,
  1349. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1350. #endif
  1351. #ifdef PNG_READ_tRNS_SUPPORTED
  1352. PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr,
  1353. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1354. #endif
  1355. #ifdef PNG_READ_zTXt_SUPPORTED
  1356. PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr,
  1357. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1358. #endif
  1359. PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_const_structrp png_ptr,
  1360. png_uint_32 chunk_name),PNG_EMPTY);
  1361. PNG_INTERNAL_FUNCTION(void,png_check_chunk_length,(png_const_structrp png_ptr,
  1362. png_uint_32 chunk_length),PNG_EMPTY);
  1363. PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr,
  1364. png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY);
  1365. /* This is the function that gets called for unknown chunks. The 'keep'
  1366. * argument is either non-zero for a known chunk that has been set to be
  1367. * handled as unknown or zero for an unknown chunk. By default the function
  1368. * just skips the chunk or errors out if it is critical.
  1369. */
  1370. #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\
  1371. defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
  1372. PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling,
  1373. (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY);
  1374. /* Exactly as the API png_handle_as_unknown() except that the argument is a
  1375. * 32-bit chunk name, not a string.
  1376. */
  1377. #endif /* READ_UNKNOWN_CHUNKS || HANDLE_AS_UNKNOWN */
  1378. /* Handle the transformations for reading and writing */
  1379. #ifdef PNG_READ_TRANSFORMS_SUPPORTED
  1380. PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr,
  1381. png_row_infop row_info),PNG_EMPTY);
  1382. #endif
  1383. #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
  1384. PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr,
  1385. png_row_infop row_info),PNG_EMPTY);
  1386. #endif
  1387. #ifdef PNG_READ_TRANSFORMS_SUPPORTED
  1388. PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr),
  1389. PNG_EMPTY);
  1390. #endif
  1391. #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
  1392. PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr,
  1393. png_inforp info_ptr),PNG_EMPTY);
  1394. PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr,
  1395. png_inforp info_ptr),PNG_EMPTY);
  1396. PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY);
  1397. PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr),
  1398. PNG_EMPTY);
  1399. PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr,
  1400. png_bytep buffer, size_t buffer_length),PNG_EMPTY);
  1401. PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY);
  1402. PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr,
  1403. png_bytep buffer, size_t buffer_length),PNG_EMPTY);
  1404. PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr),
  1405. PNG_EMPTY);
  1406. PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr,
  1407. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1408. PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr,
  1409. png_inforp info_ptr),PNG_EMPTY);
  1410. PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr,
  1411. png_inforp info_ptr),PNG_EMPTY);
  1412. PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr,
  1413. png_bytep row),PNG_EMPTY);
  1414. PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr,
  1415. png_inforp info_ptr),PNG_EMPTY);
  1416. PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr,
  1417. png_inforp info_ptr),PNG_EMPTY);
  1418. PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr),
  1419. PNG_EMPTY);
  1420. # ifdef PNG_READ_tEXt_SUPPORTED
  1421. PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr,
  1422. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1423. PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr,
  1424. png_inforp info_ptr),PNG_EMPTY);
  1425. # endif
  1426. # ifdef PNG_READ_zTXt_SUPPORTED
  1427. PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr,
  1428. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1429. PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr,
  1430. png_inforp info_ptr),PNG_EMPTY);
  1431. # endif
  1432. # ifdef PNG_READ_iTXt_SUPPORTED
  1433. PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr,
  1434. png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
  1435. PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr,
  1436. png_inforp info_ptr),PNG_EMPTY);
  1437. # endif
  1438. #endif /* PROGRESSIVE_READ */
  1439. /* Added at libpng version 1.6.0 */
  1440. #ifdef PNG_GAMMA_SUPPORTED
  1441. PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr,
  1442. png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY);
  1443. /* Set the colorspace gamma with a value provided by the application or by
  1444. * the gAMA chunk on read. The value will override anything set by an ICC
  1445. * profile.
  1446. */
  1447. PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr,
  1448. png_inforp info_ptr), PNG_EMPTY);
  1449. /* Synchronize the info 'valid' flags with the colorspace */
  1450. PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr,
  1451. png_inforp info_ptr), PNG_EMPTY);
  1452. /* Copy the png_struct colorspace to the info_struct and call the above to
  1453. * synchronize the flags. Checks for NULL info_ptr and does nothing.
  1454. */
  1455. #endif
  1456. /* Added at libpng version 1.4.0 */
  1457. #ifdef PNG_COLORSPACE_SUPPORTED
  1458. /* These internal functions are for maintaining the colorspace structure within
  1459. * a png_info or png_struct (or, indeed, both).
  1460. */
  1461. PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities,
  1462. (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy,
  1463. int preferred), PNG_EMPTY);
  1464. PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints,
  1465. (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ,
  1466. int preferred), PNG_EMPTY);
  1467. #ifdef PNG_sRGB_SUPPORTED
  1468. PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr,
  1469. png_colorspacerp colorspace, int intent), PNG_EMPTY);
  1470. /* This does set the colorspace gAMA and cHRM values too, but doesn't set the
  1471. * flags to write them, if it returns false there was a problem and an error
  1472. * message has already been output (but the colorspace may still need to be
  1473. * synced to record the invalid flag).
  1474. */
  1475. #endif /* sRGB */
  1476. #ifdef PNG_iCCP_SUPPORTED
  1477. PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr,
  1478. png_colorspacerp colorspace, png_const_charp name,
  1479. png_uint_32 profile_length, png_const_bytep profile, int color_type),
  1480. PNG_EMPTY);
  1481. /* The 'name' is used for information only */
  1482. /* Routines for checking parts of an ICC profile. */
  1483. #ifdef PNG_READ_iCCP_SUPPORTED
  1484. PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr,
  1485. png_colorspacerp colorspace, png_const_charp name,
  1486. png_uint_32 profile_length), PNG_EMPTY);
  1487. #endif /* READ_iCCP */
  1488. PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr,
  1489. png_colorspacerp colorspace, png_const_charp name,
  1490. png_uint_32 profile_length,
  1491. png_const_bytep profile /* first 132 bytes only */, int color_type),
  1492. PNG_EMPTY);
  1493. PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr,
  1494. png_colorspacerp colorspace, png_const_charp name,
  1495. png_uint_32 profile_length,
  1496. png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY);
  1497. #ifdef PNG_sRGB_SUPPORTED
  1498. PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,(
  1499. png_const_structrp png_ptr, png_colorspacerp colorspace,
  1500. png_const_bytep profile, uLong adler), PNG_EMPTY);
  1501. /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may
  1502. * be zero to indicate that it is not available. It is used, if provided,
  1503. * as a fast check on the profile when checking to see if it is sRGB.
  1504. */
  1505. #endif
  1506. #endif /* iCCP */
  1507. #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
  1508. PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients,
  1509. (png_structrp png_ptr), PNG_EMPTY);
  1510. /* Set the rgb_to_gray coefficients from the colorspace Y values */
  1511. #endif /* READ_RGB_TO_GRAY */
  1512. #endif /* COLORSPACE */
  1513. /* Added at libpng version 1.4.0 */
  1514. PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr,
  1515. png_uint_32 width, png_uint_32 height, int bit_depth,
  1516. int color_type, int interlace_type, int compression_type,
  1517. int filter_type),PNG_EMPTY);
  1518. /* Added at libpng version 1.5.10 */
  1519. #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \
  1520. defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED)
  1521. PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes,
  1522. (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY);
  1523. #endif
  1524. #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
  1525. PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr,
  1526. png_const_charp name),PNG_NORETURN);
  1527. #endif
  1528. /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite
  1529. * the end. Always leaves the buffer nul terminated. Never errors out (and
  1530. * there is no error code.)
  1531. */
  1532. PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize,
  1533. size_t pos, png_const_charp string),PNG_EMPTY);
  1534. /* Various internal functions to handle formatted warning messages, currently
  1535. * only implemented for warnings.
  1536. */
  1537. #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)
  1538. /* Utility to dump an unsigned value into a buffer, given a start pointer and
  1539. * and end pointer (which should point just *beyond* the end of the buffer!)
  1540. * Returns the pointer to the start of the formatted string. This utility only
  1541. * does unsigned values.
  1542. */
  1543. PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start,
  1544. png_charp end, int format, png_alloc_size_t number),PNG_EMPTY);
  1545. /* Convenience macro that takes an array: */
  1546. #define PNG_FORMAT_NUMBER(buffer,format,number) \
  1547. png_format_number(buffer, buffer + (sizeof buffer), format, number)
  1548. /* Suggested size for a number buffer (enough for 64 bits and a sign!) */
  1549. #define PNG_NUMBER_BUFFER_SIZE 24
  1550. /* These are the integer formats currently supported, the name is formed from
  1551. * the standard printf(3) format string.
  1552. */
  1553. #define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */
  1554. #define PNG_NUMBER_FORMAT_02u 2
  1555. #define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */
  1556. #define PNG_NUMBER_FORMAT_02d 2
  1557. #define PNG_NUMBER_FORMAT_x 3
  1558. #define PNG_NUMBER_FORMAT_02x 4
  1559. #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */
  1560. #endif
  1561. #ifdef PNG_WARNINGS_SUPPORTED
  1562. /* New defines and members adding in libpng-1.5.4 */
  1563. # define PNG_WARNING_PARAMETER_SIZE 32
  1564. # define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */
  1565. /* An l-value of this type has to be passed to the APIs below to cache the
  1566. * values of the parameters to a formatted warning message.
  1567. */
  1568. typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][
  1569. PNG_WARNING_PARAMETER_SIZE];
  1570. PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p,
  1571. int number, png_const_charp string),PNG_EMPTY);
  1572. /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters,
  1573. * including the trailing '\0'.
  1574. */
  1575. PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned,
  1576. (png_warning_parameters p, int number, int format, png_alloc_size_t value),
  1577. PNG_EMPTY);
  1578. /* Use png_alloc_size_t because it is an unsigned type as big as any we
  1579. * need to output. Use the following for a signed value.
  1580. */
  1581. PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed,
  1582. (png_warning_parameters p, int number, int format, png_int_32 value),
  1583. PNG_EMPTY);
  1584. PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr,
  1585. png_warning_parameters p, png_const_charp message),PNG_EMPTY);
  1586. /* 'message' follows the X/Open approach of using @1, @2 to insert
  1587. * parameters previously supplied using the above functions. Errors in
  1588. * specifying the parameters will simply result in garbage substitutions.
  1589. */
  1590. #endif
  1591. #ifdef PNG_BENIGN_ERRORS_SUPPORTED
  1592. /* Application errors (new in 1.6); use these functions (declared below) for
  1593. * errors in the parameters or order of API function calls on read. The
  1594. * 'warning' should be used for an error that can be handled completely; the
  1595. * 'error' for one which can be handled safely but which may lose application
  1596. * information or settings.
  1597. *
  1598. * By default these both result in a png_error call prior to release, while in a
  1599. * released version the 'warning' is just a warning. However if the application
  1600. * explicitly disables benign errors (explicitly permitting the code to lose
  1601. * information) they both turn into warnings.
  1602. *
  1603. * If benign errors aren't supported they end up as the corresponding base call
  1604. * (png_warning or png_error.)
  1605. */
  1606. PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr,
  1607. png_const_charp message),PNG_EMPTY);
  1608. /* The application provided invalid parameters to an API function or called
  1609. * an API function at the wrong time, libpng can completely recover.
  1610. */
  1611. PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr,
  1612. png_const_charp message),PNG_EMPTY);
  1613. /* As above but libpng will ignore the call, or attempt some other partial
  1614. * recovery from the error.
  1615. */
  1616. #else
  1617. # define png_app_warning(pp,s) png_warning(pp,s)
  1618. # define png_app_error(pp,s) png_error(pp,s)
  1619. #endif
  1620. PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr,
  1621. png_const_charp message, int error),PNG_EMPTY);
  1622. /* Report a recoverable issue in chunk data. On read this is used to report
  1623. * a problem found while reading a particular chunk and the
  1624. * png_chunk_benign_error or png_chunk_warning function is used as
  1625. * appropriate. On write this is used to report an error that comes from
  1626. * data set via an application call to a png_set_ API and png_app_error or
  1627. * png_app_warning is used as appropriate.
  1628. *
  1629. * The 'error' parameter must have one of the following values:
  1630. */
  1631. #define PNG_CHUNK_WARNING 0 /* never an error */
  1632. #define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */
  1633. #define PNG_CHUNK_ERROR 2 /* always an error */
  1634. /* ASCII to FP interfaces, currently only implemented if sCAL
  1635. * support is required.
  1636. */
  1637. #if defined(PNG_sCAL_SUPPORTED)
  1638. /* MAX_DIGITS is actually the maximum number of characters in an sCAL
  1639. * width or height, derived from the precision (number of significant
  1640. * digits - a build time settable option) and assumptions about the
  1641. * maximum ridiculous exponent.
  1642. */
  1643. #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/)
  1644. #ifdef PNG_FLOATING_POINT_SUPPORTED
  1645. PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr,
  1646. png_charp ascii, size_t size, double fp, unsigned int precision),
  1647. PNG_EMPTY);
  1648. #endif /* FLOATING_POINT */
  1649. #ifdef PNG_FIXED_POINT_SUPPORTED
  1650. PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr,
  1651. png_charp ascii, size_t size, png_fixed_point fp),PNG_EMPTY);
  1652. #endif /* FIXED_POINT */
  1653. #endif /* sCAL */
  1654. #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED)
  1655. /* An internal API to validate the format of a floating point number.
  1656. * The result is the index of the next character. If the number is
  1657. * not valid it will be the index of a character in the supposed number.
  1658. *
  1659. * The format of a number is defined in the PNG extensions specification
  1660. * and this API is strictly conformant to that spec, not anyone elses!
  1661. *
  1662. * The format as a regular expression is:
  1663. *
  1664. * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)?
  1665. *
  1666. * or:
  1667. *
  1668. * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)?
  1669. *
  1670. * The complexity is that either integer or fraction must be present and the
  1671. * fraction is permitted to have no digits only if the integer is present.
  1672. *
  1673. * NOTE: The dangling E problem.
  1674. * There is a PNG valid floating point number in the following:
  1675. *
  1676. * PNG floating point numbers are not greedy.
  1677. *
  1678. * Working this out requires *TWO* character lookahead (because of the
  1679. * sign), the parser does not do this - it will fail at the 'r' - this
  1680. * doesn't matter for PNG sCAL chunk values, but it requires more care
  1681. * if the value were ever to be embedded in something more complex. Use
  1682. * ANSI-C strtod if you need the lookahead.
  1683. */
  1684. /* State table for the parser. */
  1685. #define PNG_FP_INTEGER 0 /* before or in integer */
  1686. #define PNG_FP_FRACTION 1 /* before or in fraction */
  1687. #define PNG_FP_EXPONENT 2 /* before or in exponent */
  1688. #define PNG_FP_STATE 3 /* mask for the above */
  1689. #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */
  1690. #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */
  1691. #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */
  1692. #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */
  1693. #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */
  1694. /* These three values don't affect the parser. They are set but not used.
  1695. */
  1696. #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */
  1697. #define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */
  1698. #define PNG_FP_NONZERO 256 /* A non-zero value */
  1699. #define PNG_FP_STICKY 448 /* The above three flags */
  1700. /* This is available for the caller to store in 'state' if required. Do not
  1701. * call the parser after setting it (the parser sometimes clears it.)
  1702. */
  1703. #define PNG_FP_INVALID 512 /* Available for callers as a distinct value */
  1704. /* Result codes for the parser (boolean - true meants ok, false means
  1705. * not ok yet.)
  1706. */
  1707. #define PNG_FP_MAYBE 0 /* The number may be valid in the future */
  1708. #define PNG_FP_OK 1 /* The number is valid */
  1709. /* Tests on the sticky non-zero and negative flags. To pass these checks
  1710. * the state must also indicate that the whole number is valid - this is
  1711. * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this
  1712. * is equivalent to PNG_FP_OK above.)
  1713. */
  1714. #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO)
  1715. /* NZ_MASK: the string is valid and a non-zero negative value */
  1716. #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO)
  1717. /* Z MASK: the string is valid and a non-zero value. */
  1718. /* PNG_FP_SAW_DIGIT: the string is valid. */
  1719. #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT)
  1720. #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK)
  1721. #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK)
  1722. /* The actual parser. This can be called repeatedly. It updates
  1723. * the index into the string and the state variable (which must
  1724. * be initialized to 0). It returns a result code, as above. There
  1725. * is no point calling the parser any more if it fails to advance to
  1726. * the end of the string - it is stuck on an invalid character (or
  1727. * terminated by '\0').
  1728. *
  1729. * Note that the pointer will consume an E or even an E+ and then leave
  1730. * a 'maybe' state even though a preceding integer.fraction is valid.
  1731. * The PNG_FP_WAS_VALID flag indicates that a preceding substring was
  1732. * a valid number. It's possible to recover from this by calling
  1733. * the parser again (from the start, with state 0) but with a string
  1734. * that omits the last character (i.e. set the size to the index of
  1735. * the problem character.) This has not been tested within libpng.
  1736. */
  1737. PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string,
  1738. size_t size, int *statep, png_size_tp whereami),PNG_EMPTY);
  1739. /* This is the same but it checks a complete string and returns true
  1740. * only if it just contains a floating point number. As of 1.5.4 this
  1741. * function also returns the state at the end of parsing the number if
  1742. * it was valid (otherwise it returns 0.) This can be used for testing
  1743. * for negative or zero values using the sticky flag.
  1744. */
  1745. PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string,
  1746. size_t size),PNG_EMPTY);
  1747. #endif /* pCAL || sCAL */
  1748. #if defined(PNG_GAMMA_SUPPORTED) ||\
  1749. defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED)
  1750. /* Added at libpng version 1.5.0 */
  1751. /* This is a utility to provide a*times/div (rounded) and indicate
  1752. * if there is an overflow. The result is a boolean - false (0)
  1753. * for overflow, true (1) if no overflow, in which case *res
  1754. * holds the result.
  1755. */
  1756. PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a,
  1757. png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY);
  1758. #endif
  1759. #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED)
  1760. /* Same deal, but issue a warning on overflow and return 0. */
  1761. PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn,
  1762. (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by,
  1763. png_int_32 divided_by),PNG_EMPTY);
  1764. #endif
  1765. #ifdef PNG_GAMMA_SUPPORTED
  1766. /* Calculate a reciprocal - used for gamma values. This returns
  1767. * 0 if the argument is 0 in order to maintain an undefined value;
  1768. * there are no warnings.
  1769. */
  1770. PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a),
  1771. PNG_EMPTY);
  1772. #ifdef PNG_READ_GAMMA_SUPPORTED
  1773. /* The same but gives a reciprocal of the product of two fixed point
  1774. * values. Accuracy is suitable for gamma calculations but this is
  1775. * not exact - use png_muldiv for that. Only required at present on read.
  1776. */
  1777. PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a,
  1778. png_fixed_point b),PNG_EMPTY);
  1779. #endif
  1780. /* Return true if the gamma value is significantly different from 1.0 */
  1781. PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value),
  1782. PNG_EMPTY);
  1783. #endif
  1784. #ifdef PNG_READ_GAMMA_SUPPORTED
  1785. /* Internal fixed point gamma correction. These APIs are called as
  1786. * required to convert single values - they don't need to be fast,
  1787. * they are not used when processing image pixel values.
  1788. *
  1789. * While the input is an 'unsigned' value it must actually be the
  1790. * correct bit value - 0..255 or 0..65535 as required.
  1791. */
  1792. PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr,
  1793. unsigned int value, png_fixed_point gamma_value),PNG_EMPTY);
  1794. PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value,
  1795. png_fixed_point gamma_value),PNG_EMPTY);
  1796. PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value,
  1797. png_fixed_point gamma_value),PNG_EMPTY);
  1798. PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr),
  1799. PNG_EMPTY);
  1800. PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr,
  1801. int bit_depth),PNG_EMPTY);
  1802. #endif
  1803. /* SIMPLIFIED READ/WRITE SUPPORT */
  1804. #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
  1805. defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
  1806. /* The internal structure that png_image::opaque points to. */
  1807. typedef struct png_control
  1808. {
  1809. png_structp png_ptr;
  1810. png_infop info_ptr;
  1811. png_voidp error_buf; /* Always a jmp_buf at present. */
  1812. png_const_bytep memory; /* Memory buffer. */
  1813. size_t size; /* Size of the memory buffer. */
  1814. unsigned int for_write :1; /* Otherwise it is a read structure */
  1815. unsigned int owned_file :1; /* We own the file in io_ptr */
  1816. } png_control;
  1817. /* Return the pointer to the jmp_buf from a png_control: necessary because C
  1818. * does not reveal the type of the elements of jmp_buf.
  1819. */
  1820. #ifdef __cplusplus
  1821. # define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0])
  1822. #else
  1823. # define png_control_jmp_buf(pc) ((pc)->error_buf)
  1824. #endif
  1825. /* Utility to safely execute a piece of libpng code catching and logging any
  1826. * errors that might occur. Returns true on success, false on failure (either
  1827. * of the function or as a result of a png_error.)
  1828. */
  1829. PNG_INTERNAL_CALLBACK(void,png_safe_error,(png_structp png_ptr,
  1830. png_const_charp error_message),PNG_NORETURN);
  1831. #ifdef PNG_WARNINGS_SUPPORTED
  1832. PNG_INTERNAL_CALLBACK(void,png_safe_warning,(png_structp png_ptr,
  1833. png_const_charp warning_message),PNG_EMPTY);
  1834. #else
  1835. # define png_safe_warning 0/*dummy argument*/
  1836. #endif
  1837. PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image,
  1838. int (*function)(png_voidp), png_voidp arg),PNG_EMPTY);
  1839. /* Utility to log an error; this also cleans up the png_image; the function
  1840. * always returns 0 (false).
  1841. */
  1842. PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image,
  1843. png_const_charp error_message),PNG_EMPTY);
  1844. #ifndef PNG_SIMPLIFIED_READ_SUPPORTED
  1845. /* png_image_free is used by the write code but not exported */
  1846. PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY);
  1847. #endif /* !SIMPLIFIED_READ */
  1848. #endif /* SIMPLIFIED READ/WRITE */
  1849. /* These are initialization functions for hardware specific PNG filter
  1850. * optimizations; list these here then select the appropriate one at compile
  1851. * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined
  1852. * the generic code is used.
  1853. */
  1854. #ifdef PNG_FILTER_OPTIMIZATIONS
  1855. PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr,
  1856. unsigned int bpp), PNG_EMPTY);
  1857. /* Just declare the optimization that will be used */
  1858. #else
  1859. /* List *all* the possible optimizations here - this branch is required if
  1860. * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in
  1861. * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing.
  1862. */
  1863. # if PNG_ARM_NEON_OPT > 0
  1864. PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon,
  1865. (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
  1866. #endif
  1867. #if PNG_MIPS_MSA_OPT > 0
  1868. PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_msa,
  1869. (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
  1870. #endif
  1871. # if PNG_INTEL_SSE_IMPLEMENTATION > 0
  1872. PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_sse2,
  1873. (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
  1874. # endif
  1875. #endif
  1876. PNG_INTERNAL_FUNCTION(png_uint_32, png_check_keyword, (png_structrp png_ptr,
  1877. png_const_charp key, png_bytep new_key), PNG_EMPTY);
  1878. #if PNG_ARM_NEON_IMPLEMENTATION == 1
  1879. PNG_INTERNAL_FUNCTION(void,
  1880. png_riffle_palette_neon,
  1881. (png_structrp),
  1882. PNG_EMPTY);
  1883. PNG_INTERNAL_FUNCTION(int,
  1884. png_do_expand_palette_rgba8_neon,
  1885. (png_structrp,
  1886. png_row_infop,
  1887. png_const_bytep,
  1888. const png_bytepp,
  1889. const png_bytepp),
  1890. PNG_EMPTY);
  1891. PNG_INTERNAL_FUNCTION(int,
  1892. png_do_expand_palette_rgb8_neon,
  1893. (png_structrp,
  1894. png_row_infop,
  1895. png_const_bytep,
  1896. const png_bytepp,
  1897. const png_bytepp),
  1898. PNG_EMPTY);
  1899. #endif
  1900. /* Maintainer: Put new private prototypes here ^ */
  1901. #include "pngdebug.h"
  1902. #ifdef __cplusplus
  1903. }
  1904. #endif
  1905. #endif /* PNG_VERSION_INFO_ONLY */
  1906. #endif /* PNGPRIV_H */