michael@0: michael@0: /* pngpriv.h - private declarations for use inside libpng michael@0: * michael@0: * For conditions of distribution and use, see copyright notice in png.h michael@0: * Copyright (c) 1998-2014 Glenn Randers-Pehrson michael@0: * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) michael@0: * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) michael@0: * michael@0: * Last changed in libpng 1.6.10 [March 6, 2014] michael@0: * michael@0: * This code is released under the libpng license. michael@0: * For conditions of distribution and use, see the disclaimer michael@0: * and license in png.h michael@0: */ michael@0: michael@0: /* The symbols declared in this file (including the functions declared michael@0: * as extern) are PRIVATE. They are not part of the libpng public michael@0: * interface, and are not recommended for use by regular applications. michael@0: * Some of them may become public in the future; others may stay private, michael@0: * change in an incompatible way, or even disappear. michael@0: * Although the libpng users are not forbidden to include this header, michael@0: * they should be well aware of the issues that may arise from doing so. michael@0: */ michael@0: michael@0: #ifndef PNGPRIV_H michael@0: #define PNGPRIV_H michael@0: michael@0: /* Feature Test Macros. The following are defined here to ensure that correctly michael@0: * implemented libraries reveal the APIs libpng needs to build and hide those michael@0: * that are not needed and potentially damaging to the compilation. michael@0: * michael@0: * Feature Test Macros must be defined before any system header is included (see michael@0: * POSIX 1003.1 2.8.2 "POSIX Symbols." michael@0: * michael@0: * These macros only have an effect if the operating system supports either michael@0: * POSIX 1003.1 or C99, or both. On other operating systems (particularly michael@0: * Windows/Visual Studio) there is no effect; the OS specific tests below are michael@0: * still required (as of 2011-05-02.) michael@0: */ michael@0: #define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */ michael@0: michael@0: #ifndef PNG_VERSION_INFO_ONLY michael@0: /* Standard library headers not required by png.h: */ michael@0: # include michael@0: # include michael@0: #endif michael@0: michael@0: #define PNGLIB_BUILD /*libpng is being built, not used*/ michael@0: michael@0: /* If HAVE_CONFIG_H is defined during the build then the build system must michael@0: * provide an appropriate "config.h" file on the include path. The header file michael@0: * must provide definitions as required below (search for "HAVE_CONFIG_H"); michael@0: * see configure.ac for more details of the requirements. The macro michael@0: * "PNG_NO_CONFIG_H" is provided for maintainers to test for dependencies on michael@0: * 'configure'; define this macro to prevent the configure build including the michael@0: * configure generated config.h. Libpng is expected to compile without *any* michael@0: * special build system support on a reasonably ANSI-C compliant system. michael@0: */ michael@0: #if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H) michael@0: # include michael@0: michael@0: /* Pick up the definition of 'restrict' from config.h if it was read: */ michael@0: # define PNG_RESTRICT restrict michael@0: #endif michael@0: michael@0: #include "mozpngconf.h" michael@0: michael@0: /* To support symbol prefixing it is necessary to know *before* including png.h michael@0: * whether the fixed point (and maybe other) APIs are exported, because if they michael@0: * are not internal definitions may be required. This is handled below just michael@0: * before png.h is included, but load the configuration now if it is available. michael@0: */ michael@0: #ifndef PNGLCONF_H michael@0: # include "pnglibconf.h" michael@0: #endif michael@0: michael@0: /* Local renames may change non-exported API functions from png.h */ michael@0: #if defined(PNG_PREFIX) && !defined(PNGPREFIX_H) michael@0: # include "pngprefix.h" michael@0: #endif michael@0: michael@0: #ifdef PNG_USER_CONFIG michael@0: # include "pngusr.h" michael@0: /* These should have been defined in pngusr.h */ michael@0: # ifndef PNG_USER_PRIVATEBUILD michael@0: # define PNG_USER_PRIVATEBUILD "Custom libpng build" michael@0: # endif michael@0: # ifndef PNG_USER_DLLFNAME_POSTFIX michael@0: # define PNG_USER_DLLFNAME_POSTFIX "Cb" michael@0: # endif michael@0: #endif michael@0: michael@0: /* Compile time options. michael@0: * ===================== michael@0: * In a multi-arch build the compiler may compile the code several times for the michael@0: * same object module, producing different binaries for different architectures. michael@0: * When this happens configure-time setting of the target host options cannot be michael@0: * done and this interferes with the handling of the ARM NEON optimizations, and michael@0: * possibly other similar optimizations. Put additional tests here; in general michael@0: * this is needed when the same option can be changed at both compile time and michael@0: * run time depending on the target OS (i.e. iOS vs Android.) michael@0: * michael@0: * NOTE: symbol prefixing does not pass $(CFLAGS) to the preprocessor, because michael@0: * this is not possible with certain compilers (Oracle SUN OS CC), as a result michael@0: * it is necessary to ensure that all extern functions that *might* be used michael@0: * regardless of $(CFLAGS) get declared in this file. The test on __ARM_NEON__ michael@0: * below is one example of this behavior because it is controlled by the michael@0: * presence or not of -mfpu=neon on the GCC command line, it is possible to do michael@0: * this in $(CC), e.g. "CC=gcc -mfpu=neon", but people who build libpng rarely michael@0: * do this. michael@0: */ michael@0: #ifndef PNG_ARM_NEON_OPT michael@0: /* ARM NEON optimizations are being controlled by the compiler settings, michael@0: * typically the target FPU. If the FPU has been set to NEON (-mfpu=neon michael@0: * with GCC) then the compiler will define __ARM_NEON__ and we can rely michael@0: * unconditionally on NEON instructions not crashing, otherwise we must michael@0: * disable use of NEON instructions. michael@0: * michael@0: * NOTE: at present these optimizations depend on 'ALIGNED_MEMORY', so they michael@0: * can only be turned on automatically if that is supported too. If michael@0: * PNG_ARM_NEON_OPT is set in CPPFLAGS (to >0) then arm/arm_init.c will fail michael@0: * to compile with an appropriate #error if ALIGNED_MEMORY has been turned michael@0: * off. michael@0: */ michael@0: # if defined(__ARM_NEON__) && defined(PNG_ALIGNED_MEMORY_SUPPORTED) michael@0: # define PNG_ARM_NEON_OPT 2 michael@0: # else michael@0: # define PNG_ARM_NEON_OPT 0 michael@0: # endif michael@0: #endif michael@0: michael@0: #if PNG_ARM_NEON_OPT > 0 michael@0: /* NEON optimizations are to be at least considered by libpng, so enable the michael@0: * callbacks to do this. michael@0: */ michael@0: # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_neon michael@0: michael@0: /* By default the 'intrinsics' code in arm/filter_neon_intrinsics.c is used michael@0: * if possible - if __ARM_NEON__ is set and the compiler version is not known michael@0: * to be broken. This is controlled by PNG_ARM_NEON_IMPLEMENTATION which can michael@0: * be: michael@0: * michael@0: * 1 The intrinsics code (the default with __ARM_NEON__) michael@0: * 2 The hand coded assembler (the default without __ARM_NEON__) michael@0: * michael@0: * It is possible to set PNG_ARM_NEON_IMPLEMENTATION in CPPFLAGS, however michael@0: * this is *NOT* supported and may cease to work even after a minor revision michael@0: * to libpng. It *is* valid to do this for testing purposes, e.g. speed michael@0: * testing or a new compiler, but the results should be communicated to the michael@0: * libpng implementation list for incorporation in the next minor release. michael@0: */ michael@0: # ifndef PNG_ARM_NEON_IMPLEMENTATION michael@0: # ifdef __ARM_NEON__ michael@0: # if defined(__clang__) michael@0: /* At present it is unknown by the libpng developers which versions michael@0: * of clang support the intrinsics, however some or perhaps all michael@0: * versions do not work with the assembler so this may be michael@0: * irrelevant, so just use the default (do nothing here.) michael@0: */ michael@0: # elif defined(__GNUC__) michael@0: /* GCC 4.5.4 NEON support is known to be broken. 4.6.3 is known to michael@0: * work, so if this *is* GCC, or G++, look for a version >4.5 michael@0: */ michael@0: # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6) michael@0: # define PNG_ARM_NEON_IMPLEMENTATION 2 michael@0: # endif /* no GNUC support */ michael@0: # endif /* __GNUC__ */ michael@0: # else /* !defined __ARM_NEON__ */ michael@0: /* The 'intrinsics' code simply won't compile without this -mfpu=neon: michael@0: */ michael@0: # define PNG_ARM_NEON_IMPLEMENTATION 2 michael@0: # endif /* __ARM_NEON__ */ michael@0: # endif /* !defined PNG_ARM_NEON_IMPLEMENTATION */ michael@0: michael@0: # ifndef PNG_ARM_NEON_IMPLEMENTATION michael@0: /* Use the intrinsics code by default. */ michael@0: # define PNG_ARM_NEON_IMPLEMENTATION 1 michael@0: # endif michael@0: #endif /* PNG_ARM_NEON_OPT > 0 */ michael@0: michael@0: /* Is this a build of a DLL where compilation of the object modules requires michael@0: * different preprocessor settings to those required for a simple library? If michael@0: * so PNG_BUILD_DLL must be set. michael@0: * michael@0: * If libpng is used inside a DLL but that DLL does not export the libpng APIs michael@0: * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a michael@0: * static library of libpng then link the DLL against that. michael@0: */ michael@0: #ifndef PNG_BUILD_DLL michael@0: # ifdef DLL_EXPORT michael@0: /* This is set by libtool when files are compiled for a DLL; libtool michael@0: * always compiles twice, even on systems where it isn't necessary. Set michael@0: * PNG_BUILD_DLL in case it is necessary: michael@0: */ michael@0: # define PNG_BUILD_DLL michael@0: # else michael@0: # ifdef _WINDLL michael@0: /* This is set by the Microsoft Visual Studio IDE in projects that michael@0: * build a DLL. It can't easily be removed from those projects (it michael@0: * isn't visible in the Visual Studio UI) so it is a fairly reliable michael@0: * indication that PNG_IMPEXP needs to be set to the DLL export michael@0: * attributes. michael@0: */ michael@0: # define PNG_BUILD_DLL michael@0: # else michael@0: # ifdef __DLL__ michael@0: /* This is set by the Borland C system when compiling for a DLL michael@0: * (as above.) michael@0: */ michael@0: # define PNG_BUILD_DLL michael@0: # else michael@0: /* Add additional compiler cases here. */ michael@0: # endif michael@0: # endif michael@0: # endif michael@0: #endif /* Setting PNG_BUILD_DLL if required */ michael@0: michael@0: /* See pngconf.h for more details: the builder of the library may set this on michael@0: * the command line to the right thing for the specific compilation system or it michael@0: * may be automagically set above (at present we know of no system where it does michael@0: * need to be set on the command line.) michael@0: * michael@0: * PNG_IMPEXP must be set here when building the library to prevent pngconf.h michael@0: * setting it to the "import" setting for a DLL build. michael@0: */ michael@0: #ifndef PNG_IMPEXP michael@0: # ifdef PNG_BUILD_DLL michael@0: # define PNG_IMPEXP PNG_DLL_EXPORT michael@0: # else michael@0: /* Not building a DLL, or the DLL doesn't require specific export michael@0: * definitions. michael@0: */ michael@0: # define PNG_IMPEXP michael@0: # endif michael@0: #endif michael@0: michael@0: /* No warnings for private or deprecated functions in the build: */ michael@0: #ifndef PNG_DEPRECATED michael@0: # define PNG_DEPRECATED michael@0: #endif michael@0: #ifndef PNG_PRIVATE michael@0: # define PNG_PRIVATE michael@0: #endif michael@0: michael@0: /* Symbol preprocessing support. michael@0: * michael@0: * To enable listing global, but internal, symbols the following macros should michael@0: * always be used to declare an extern data or function object in this file. michael@0: */ michael@0: #ifndef PNG_INTERNAL_DATA michael@0: # define PNG_INTERNAL_DATA(type, name, array) extern type name array michael@0: #endif michael@0: michael@0: #ifndef PNG_INTERNAL_FUNCTION michael@0: # define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\ michael@0: extern PNG_FUNCTION(type, name, args, PNG_EMPTY attributes) michael@0: #endif michael@0: michael@0: #ifndef PNG_INTERNAL_CALLBACK michael@0: # define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\ michael@0: extern PNG_FUNCTION(type, (PNGCBAPI name), args, PNG_EMPTY attributes) michael@0: #endif michael@0: michael@0: /* If floating or fixed point APIs are disabled they may still be compiled michael@0: * internally. To handle this make sure they are declared as the appropriate michael@0: * internal extern function (otherwise the symbol prefixing stuff won't work and michael@0: * the functions will be used without definitions.) michael@0: * michael@0: * NOTE: although all the API functions are declared here they are not all michael@0: * actually built! Because the declarations are still made it is necessary to michael@0: * fake out types that they depend on. michael@0: */ michael@0: #ifndef PNG_FP_EXPORT michael@0: # ifndef PNG_FLOATING_POINT_SUPPORTED michael@0: # define PNG_FP_EXPORT(ordinal, type, name, args)\ michael@0: PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); michael@0: # ifndef PNG_VERSION_INFO_ONLY michael@0: typedef struct png_incomplete png_double; michael@0: typedef png_double* png_doublep; michael@0: typedef const png_double* png_const_doublep; michael@0: typedef png_double** png_doublepp; michael@0: # endif michael@0: # endif michael@0: #endif michael@0: #ifndef PNG_FIXED_EXPORT michael@0: # ifndef PNG_FIXED_POINT_SUPPORTED michael@0: # define PNG_FIXED_EXPORT(ordinal, type, name, args)\ michael@0: PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); michael@0: # endif michael@0: #endif michael@0: michael@0: #include "png.h" michael@0: michael@0: /* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */ michael@0: #ifndef PNG_DLL_EXPORT michael@0: # define PNG_DLL_EXPORT michael@0: #endif michael@0: michael@0: /* SECURITY and SAFETY: michael@0: * michael@0: * By default libpng is built without any internal limits on image size, michael@0: * individual heap (png_malloc) allocations or the total amount of memory used. michael@0: * If PNG_SAFE_LIMITS_SUPPORTED is defined, however, the limits below are used michael@0: * (unless individually overridden). These limits are believed to be fairly michael@0: * safe, but builders of secure systems should verify the values against the michael@0: * real system capabilities. michael@0: */ michael@0: #ifdef PNG_SAFE_LIMITS_SUPPORTED michael@0: /* 'safe' limits */ michael@0: # ifndef PNG_USER_WIDTH_MAX michael@0: # define PNG_USER_WIDTH_MAX 1000000 michael@0: # endif michael@0: # ifndef PNG_USER_HEIGHT_MAX michael@0: # define PNG_USER_HEIGHT_MAX 1000000 michael@0: # endif michael@0: # ifndef PNG_USER_CHUNK_CACHE_MAX michael@0: # define PNG_USER_CHUNK_CACHE_MAX 128 michael@0: # endif michael@0: # ifndef PNG_USER_CHUNK_MALLOC_MAX michael@0: # define PNG_USER_CHUNK_MALLOC_MAX 8000000 michael@0: # endif michael@0: #else michael@0: /* values for no limits */ michael@0: # ifndef PNG_USER_WIDTH_MAX michael@0: # define PNG_USER_WIDTH_MAX 0x7fffffff michael@0: # endif michael@0: # ifndef PNG_USER_HEIGHT_MAX michael@0: # define PNG_USER_HEIGHT_MAX 0x7fffffff michael@0: # endif michael@0: # ifndef PNG_USER_CHUNK_CACHE_MAX michael@0: # define PNG_USER_CHUNK_CACHE_MAX 0 michael@0: # endif michael@0: # ifndef PNG_USER_CHUNK_MALLOC_MAX michael@0: # define PNG_USER_CHUNK_MALLOC_MAX 0 michael@0: # endif michael@0: #endif michael@0: michael@0: /* Moved to pngpriv.h at libpng-1.5.0 */ michael@0: /* NOTE: some of these may have been used in external applications as michael@0: * these definitions were exposed in pngconf.h prior to 1.5. michael@0: */ michael@0: michael@0: /* If you are running on a machine where you cannot allocate more michael@0: * than 64K of memory at once, uncomment this. While libpng will not michael@0: * normally need that much memory in a chunk (unless you load up a very michael@0: * large file), zlib needs to know how big of a chunk it can use, and michael@0: * libpng thus makes sure to check any memory allocation to verify it michael@0: * will fit into memory. michael@0: * michael@0: * zlib provides 'MAXSEG_64K' which, if defined, indicates the michael@0: * same limit and pngconf.h (already included) sets the limit michael@0: * if certain operating systems are detected. michael@0: */ michael@0: #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K) michael@0: # define PNG_MAX_MALLOC_64K michael@0: #endif michael@0: michael@0: #ifndef PNG_UNUSED michael@0: /* Unused formal parameter warnings are silenced using the following macro michael@0: * which is expected to have no bad effects on performance (optimizing michael@0: * compilers will probably remove it entirely). Note that if you replace michael@0: * it with something other than whitespace, you must include the terminating michael@0: * semicolon. michael@0: */ michael@0: # define PNG_UNUSED(param) (void)param; michael@0: #endif michael@0: michael@0: /* Just a little check that someone hasn't tried to define something michael@0: * contradictory. michael@0: */ michael@0: #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K) michael@0: # undef PNG_ZBUF_SIZE michael@0: # define PNG_ZBUF_SIZE 65536L michael@0: #endif michael@0: michael@0: /* If warnings or errors are turned off the code is disabled or redirected here. michael@0: * From 1.5.4 functions have been added to allow very limited formatting of michael@0: * error and warning messages - this code will also be disabled here. michael@0: */ michael@0: #ifdef PNG_WARNINGS_SUPPORTED michael@0: # define PNG_WARNING_PARAMETERS(p) png_warning_parameters p; michael@0: #else michael@0: # define png_warning_parameter(p,number,string) ((void)0) michael@0: # define png_warning_parameter_unsigned(p,number,format,value) ((void)0) michael@0: # define png_warning_parameter_signed(p,number,format,value) ((void)0) michael@0: # define png_formatted_warning(pp,p,message) ((void)(pp)) michael@0: # define PNG_WARNING_PARAMETERS(p) michael@0: #endif michael@0: #ifndef PNG_ERROR_TEXT_SUPPORTED michael@0: # define png_fixed_error(s1,s2) png_err(s1) michael@0: #endif michael@0: michael@0: /* C allows up-casts from (void*) to any pointer and (const void*) to any michael@0: * pointer to a const object. C++ regards this as a type error and requires an michael@0: * explicit, static, cast and provides the static_cast<> rune to ensure that michael@0: * const is not cast away. michael@0: */ michael@0: #ifdef __cplusplus michael@0: # define png_voidcast(type, value) static_cast(value) michael@0: # define png_constcast(type, value) const_cast(value) michael@0: # define png_aligncast(type, value) \ michael@0: static_cast(static_cast(value)) michael@0: # define png_aligncastconst(type, value) \ michael@0: static_cast(static_cast(value)) michael@0: #else michael@0: # define png_voidcast(type, value) (value) michael@0: # define png_constcast(type, value) ((type)(value)) michael@0: # define png_aligncast(type, value) ((void*)(value)) michael@0: # define png_aligncastconst(type, value) ((const void*)(value)) michael@0: #endif /* __cplusplus */ michael@0: michael@0: /* Some fixed point APIs are still required even if not exported because michael@0: * they get used by the corresponding floating point APIs. This magic michael@0: * deals with this: michael@0: */ michael@0: #ifdef PNG_FIXED_POINT_SUPPORTED michael@0: # define PNGFAPI PNGAPI michael@0: #else michael@0: # define PNGFAPI /* PRIVATE */ michael@0: #endif michael@0: michael@0: #ifndef PNG_VERSION_INFO_ONLY michael@0: /* Other defines specific to compilers can go here. Try to keep michael@0: * them inside an appropriate ifdef/endif pair for portability. michael@0: */ michael@0: #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\ michael@0: defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) michael@0: /* png.c requires the following ANSI-C constants if the conversion of michael@0: * floating point to ASCII is implemented therein: michael@0: * michael@0: * DBL_DIG Maximum number of decimal digits (can be set to any constant) michael@0: * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value) michael@0: * DBL_MAX Maximum floating point number (can be set to an arbitrary value) michael@0: */ michael@0: # include michael@0: michael@0: # if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \ michael@0: defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC) michael@0: /* We need to check that hasn't already been included earlier michael@0: * as it seems it doesn't agree with , yet we should really use michael@0: * if possible. michael@0: */ michael@0: # if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__) michael@0: # include michael@0: # endif michael@0: # else michael@0: # include michael@0: # endif michael@0: # if defined(_AMIGA) && defined(__SASC) && defined(_M68881) michael@0: /* Amiga SAS/C: We must include builtin FPU functions when compiling using michael@0: * MATH=68881 michael@0: */ michael@0: # include michael@0: # endif michael@0: #endif michael@0: michael@0: /* This provides the non-ANSI (far) memory allocation routines. */ michael@0: #if defined(__TURBOC__) && defined(__MSDOS__) michael@0: # include michael@0: # include michael@0: #endif michael@0: michael@0: #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \ michael@0: defined(_WIN32) || defined(__WIN32__) michael@0: # include /* defines _WINDOWS_ macro */ michael@0: #endif michael@0: #endif /* PNG_VERSION_INFO_ONLY */ michael@0: michael@0: /* Moved here around 1.5.0beta36 from pngconf.h */ michael@0: /* Users may want to use these so they are not private. Any library michael@0: * functions that are passed far data must be model-independent. michael@0: */ michael@0: michael@0: /* Memory model/platform independent fns */ michael@0: #ifndef PNG_ABORT michael@0: # ifdef _WINDOWS_ michael@0: # define PNG_ABORT() ExitProcess(0) michael@0: # else michael@0: # define PNG_ABORT() abort() michael@0: # endif michael@0: #endif michael@0: michael@0: /* These macros may need to be architecture dependent. */ michael@0: #define PNG_ALIGN_NONE 0 /* do not use data alignment */ michael@0: #define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */ michael@0: #ifdef offsetof michael@0: # define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */ michael@0: #else michael@0: # define PNG_ALIGN_OFFSET -1 /* prevent the use of this */ michael@0: #endif michael@0: #define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */ michael@0: michael@0: #ifndef PNG_ALIGN_TYPE michael@0: /* Default to using aligned access optimizations and requiring alignment to a michael@0: * multiple of the data type size. Override in a compiler specific fashion michael@0: * if necessary by inserting tests here: michael@0: */ michael@0: # define PNG_ALIGN_TYPE PNG_ALIGN_SIZE michael@0: #endif michael@0: michael@0: #if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE michael@0: /* This is used because in some compiler implementations non-aligned michael@0: * structure members are supported, so the offsetof approach below fails. michael@0: * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access michael@0: * is good for performance. Do not do this unless you have tested the result michael@0: * and understand it. michael@0: */ michael@0: # define png_alignof(type) (sizeof (type)) michael@0: #else michael@0: # if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET michael@0: # define png_alignof(type) offsetof(struct{char c; type t;}, t) michael@0: # else michael@0: # if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS michael@0: # define png_alignof(type) (1) michael@0: # endif michael@0: /* Else leave png_alignof undefined to prevent use thereof */ michael@0: # endif michael@0: #endif michael@0: michael@0: /* This implicitly assumes alignment is always to a power of 2. */ michael@0: #ifdef png_alignof michael@0: # define png_isaligned(ptr, type)\ michael@0: ((((const char*)ptr-(const char*)0) & (png_alignof(type)-1)) == 0) michael@0: #else michael@0: # define png_isaligned(ptr, type) 0 michael@0: #endif michael@0: michael@0: /* End of memory model/platform independent support */ michael@0: /* End of 1.5.0beta36 move from pngconf.h */ michael@0: michael@0: /* CONSTANTS and UTILITY MACROS michael@0: * These are used internally by libpng and not exposed in the API michael@0: */ michael@0: michael@0: /* Various modes of operation. Note that after an init, mode is set to michael@0: * zero automatically when the structure is created. Three of these michael@0: * are defined in png.h because they need to be visible to applications michael@0: * that call png_set_unknown_chunk(). michael@0: */ michael@0: /* #define PNG_HAVE_IHDR 0x01 (defined in png.h) */ michael@0: /* #define PNG_HAVE_PLTE 0x02 (defined in png.h) */ michael@0: #define PNG_HAVE_IDAT 0x04 michael@0: /* #define PNG_AFTER_IDAT 0x08 (defined in png.h) */ michael@0: #define PNG_HAVE_IEND 0x10 michael@0: /* 0x20 (unused) */ michael@0: /* 0x40 (unused) */ michael@0: /* 0x80 (unused) */ michael@0: #define PNG_HAVE_CHUNK_HEADER 0x100 michael@0: #define PNG_WROTE_tIME 0x200 michael@0: #define PNG_WROTE_INFO_BEFORE_PLTE 0x400 michael@0: #define PNG_BACKGROUND_IS_GRAY 0x800 michael@0: #define PNG_HAVE_PNG_SIGNATURE 0x1000 michael@0: #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ michael@0: /* 0x4000 (unused) */ michael@0: #define PNG_IS_READ_STRUCT 0x8000 /* Else is a write struct */ michael@0: #ifdef PNG_APNG_SUPPORTED michael@0: #define PNG_HAVE_acTL 0x10000 michael@0: #define PNG_HAVE_fcTL 0x20000 michael@0: #endif michael@0: michael@0: /* Flags for the transformations the PNG library does on the image data */ michael@0: #define PNG_BGR 0x0001 michael@0: #define PNG_INTERLACE 0x0002 michael@0: #define PNG_PACK 0x0004 michael@0: #define PNG_SHIFT 0x0008 michael@0: #define PNG_SWAP_BYTES 0x0010 michael@0: #define PNG_INVERT_MONO 0x0020 michael@0: #define PNG_QUANTIZE 0x0040 michael@0: #define PNG_COMPOSE 0x0080 /* Was PNG_BACKGROUND */ michael@0: #define PNG_BACKGROUND_EXPAND 0x0100 michael@0: #define PNG_EXPAND_16 0x0200 /* Added to libpng 1.5.2 */ michael@0: #define PNG_16_TO_8 0x0400 /* Becomes 'chop' in 1.5.4 */ michael@0: #define PNG_RGBA 0x0800 michael@0: #define PNG_EXPAND 0x1000 michael@0: #define PNG_GAMMA 0x2000 michael@0: #define PNG_GRAY_TO_RGB 0x4000 michael@0: #define PNG_FILLER 0x8000 michael@0: #define PNG_PACKSWAP 0x10000 michael@0: #define PNG_SWAP_ALPHA 0x20000 michael@0: #define PNG_STRIP_ALPHA 0x40000 michael@0: #define PNG_INVERT_ALPHA 0x80000 michael@0: #define PNG_USER_TRANSFORM 0x100000 michael@0: #define PNG_RGB_TO_GRAY_ERR 0x200000 michael@0: #define PNG_RGB_TO_GRAY_WARN 0x400000 michael@0: #define PNG_RGB_TO_GRAY 0x600000 /* two bits, RGB_TO_GRAY_ERR|WARN */ michael@0: #define PNG_ENCODE_ALPHA 0x800000 /* Added to libpng-1.5.4 */ michael@0: #define PNG_ADD_ALPHA 0x1000000 /* Added to libpng-1.2.7 */ michael@0: #define PNG_EXPAND_tRNS 0x2000000 /* Added to libpng-1.2.9 */ michael@0: #define PNG_SCALE_16_TO_8 0x4000000 /* Added to libpng-1.5.4 */ michael@0: /* 0x8000000 unused */ michael@0: /* 0x10000000 unused */ michael@0: /* 0x20000000 unused */ michael@0: /* 0x40000000 unused */ michael@0: /* Flags for png_create_struct */ michael@0: #define PNG_STRUCT_PNG 0x0001 michael@0: #define PNG_STRUCT_INFO 0x0002 michael@0: michael@0: /* Scaling factor for filter heuristic weighting calculations */ michael@0: #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) michael@0: #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) michael@0: michael@0: /* Flags for the png_ptr->flags rather than declaring a byte for each one */ michael@0: #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 michael@0: #define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002 /* Added to libpng-1.6.0 */ michael@0: /* 0x0004 unused */ michael@0: #define PNG_FLAG_ZSTREAM_ENDED 0x0008 /* Added to libpng-1.6.0 */ michael@0: /* 0x0010 unused */ michael@0: /* 0x0020 unused */ michael@0: #define PNG_FLAG_ROW_INIT 0x0040 michael@0: #define PNG_FLAG_FILLER_AFTER 0x0080 michael@0: #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 michael@0: #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 michael@0: #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 michael@0: #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 michael@0: #define PNG_FLAG_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.4 */ michael@0: #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.4 */ michael@0: #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.4 */ michael@0: /* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000 */ michael@0: /* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000 */ michael@0: #define PNG_FLAG_LIBRARY_MISMATCH 0x20000 michael@0: #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000 michael@0: #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000 michael@0: #define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000 /* Added to libpng-1.4.0 */ michael@0: #define PNG_FLAG_APP_WARNINGS_WARN 0x200000 /* Added to libpng-1.6.0 */ michael@0: #define PNG_FLAG_APP_ERRORS_WARN 0x400000 /* Added to libpng-1.6.0 */ michael@0: /* 0x800000 unused */ michael@0: /* 0x1000000 unused */ michael@0: /* 0x2000000 unused */ michael@0: /* 0x4000000 unused */ michael@0: /* 0x8000000 unused */ michael@0: /* 0x10000000 unused */ michael@0: /* 0x20000000 unused */ michael@0: /* 0x40000000 unused */ michael@0: michael@0: #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ michael@0: PNG_FLAG_CRC_ANCILLARY_NOWARN) michael@0: michael@0: #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ michael@0: PNG_FLAG_CRC_CRITICAL_IGNORE) michael@0: michael@0: #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ michael@0: PNG_FLAG_CRC_CRITICAL_MASK) michael@0: michael@0: /* Save typing and make code easier to understand */ michael@0: michael@0: #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ michael@0: abs((int)((c1).green) - (int)((c2).green)) + \ michael@0: abs((int)((c1).blue) - (int)((c2).blue))) michael@0: michael@0: /* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255 michael@0: * by dividing by 257 *with rounding*. This macro is exact for the given range. michael@0: * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the michael@0: * macro were established by experiment (modifying the added value). The macro michael@0: * has a second variant that takes a value already scaled by 255 and divides by michael@0: * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it michael@0: * only gives off-by-one errors and only for 0.5% (1 in 200) of the values. michael@0: */ michael@0: #define PNG_DIV65535(v24) (((v24) + 32895) >> 16) michael@0: #define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255) michael@0: michael@0: /* Added to libpng-1.2.6 JB */ michael@0: #define PNG_ROWBYTES(pixel_bits, width) \ michael@0: ((pixel_bits) >= 8 ? \ michael@0: ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \ michael@0: (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) ) michael@0: michael@0: /* PNG_OUT_OF_RANGE returns true if value is outside the range michael@0: * ideal-delta..ideal+delta. Each argument is evaluated twice. michael@0: * "ideal" and "delta" should be constants, normally simple michael@0: * integers, "value" a variable. Added to libpng-1.2.6 JB michael@0: */ michael@0: #define PNG_OUT_OF_RANGE(value, ideal, delta) \ michael@0: ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) michael@0: michael@0: /* Conversions between fixed and floating point, only defined if michael@0: * required (to make sure the code doesn't accidentally use float michael@0: * when it is supposedly disabled.) michael@0: */ michael@0: #ifdef PNG_FLOATING_POINT_SUPPORTED michael@0: /* The floating point conversion can't overflow, though it can and michael@0: * does lose accuracy relative to the original fixed point value. michael@0: * In practice this doesn't matter because png_fixed_point only michael@0: * stores numbers with very low precision. The png_ptr and s michael@0: * arguments are unused by default but are there in case error michael@0: * checking becomes a requirement. michael@0: */ michael@0: #define png_float(png_ptr, fixed, s) (.00001 * (fixed)) michael@0: michael@0: /* The fixed point conversion performs range checking and evaluates michael@0: * its argument multiple times, so must be used with care. The michael@0: * range checking uses the PNG specification values for a signed michael@0: * 32 bit fixed point value except that the values are deliberately michael@0: * rounded-to-zero to an integral value - 21474 (21474.83 is roughly michael@0: * (2^31-1) * 100000). 's' is a string that describes the value being michael@0: * converted. michael@0: * michael@0: * NOTE: this macro will raise a png_error if the range check fails, michael@0: * therefore it is normally only appropriate to use this on values michael@0: * that come from API calls or other sources where an out of range michael@0: * error indicates a programming error, not a data error! michael@0: * michael@0: * NOTE: by default this is off - the macro is not used - because the michael@0: * function call saves a lot of code. michael@0: */ michael@0: #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED michael@0: #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\ michael@0: ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0)) michael@0: #endif michael@0: /* else the corresponding function is defined below, inside the scope of the michael@0: * cplusplus test. michael@0: */ michael@0: #endif michael@0: michael@0: /* Constants for known chunk types. If you need to add a chunk, define the name michael@0: * here. For historical reasons these constants have the form png_; i.e. michael@0: * the prefix is lower case. Please use decimal values as the parameters to michael@0: * match the ISO PNG specification and to avoid relying on the C locale michael@0: * interpretation of character values. michael@0: * michael@0: * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values michael@0: * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string michael@0: * to be generated if required. michael@0: * michael@0: * PNG_32b correctly produces a value shifted by up to 24 bits, even on michael@0: * architectures where (int) is only 16 bits. michael@0: */ michael@0: #define PNG_32b(b,s) ((png_uint_32)(b) << (s)) michael@0: #define PNG_U32(b1,b2,b3,b4) \ michael@0: (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0)) michael@0: michael@0: /* Constants for known chunk types. michael@0: * michael@0: * MAINTAINERS: If you need to add a chunk, define the name here. michael@0: * For historical reasons these constants have the form png_; i.e. michael@0: * the prefix is lower case. Please use decimal values as the parameters to michael@0: * match the ISO PNG specification and to avoid relying on the C locale michael@0: * interpretation of character values. Please keep the list sorted. michael@0: * michael@0: * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk michael@0: * type. In fact the specification does not express chunk types this way, michael@0: * however using a 32-bit value means that the chunk type can be read from the michael@0: * stream using exactly the same code as used for a 32-bit unsigned value and michael@0: * can be examined far more efficiently (using one arithmetic compare). michael@0: * michael@0: * Prior to 1.5.6 the chunk type constants were expressed as C strings. The michael@0: * libpng API still uses strings for 'unknown' chunks and a macro, michael@0: * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice michael@0: * that for portable code numeric values must still be used; the string "IHDR" michael@0: * is not portable and neither is PNG_U32('I', 'H', 'D', 'R'). michael@0: * michael@0: * In 1.7.0 the definitions will be made public in png.h to avoid having to michael@0: * duplicate the same definitions in application code. michael@0: */ michael@0: #define png_IDAT PNG_U32( 73, 68, 65, 84) michael@0: #define png_IEND PNG_U32( 73, 69, 78, 68) michael@0: #define png_IHDR PNG_U32( 73, 72, 68, 82) michael@0: #define png_PLTE PNG_U32( 80, 76, 84, 69) michael@0: #define png_bKGD PNG_U32( 98, 75, 71, 68) michael@0: #define png_cHRM PNG_U32( 99, 72, 82, 77) michael@0: #define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */ michael@0: #define png_gAMA PNG_U32(103, 65, 77, 65) michael@0: #define png_gIFg PNG_U32(103, 73, 70, 103) michael@0: #define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */ michael@0: #define png_gIFx PNG_U32(103, 73, 70, 120) michael@0: #define png_hIST PNG_U32(104, 73, 83, 84) michael@0: #define png_iCCP PNG_U32(105, 67, 67, 80) michael@0: #define png_iTXt PNG_U32(105, 84, 88, 116) michael@0: #define png_oFFs PNG_U32(111, 70, 70, 115) michael@0: #define png_pCAL PNG_U32(112, 67, 65, 76) michael@0: #define png_pHYs PNG_U32(112, 72, 89, 115) michael@0: #define png_sBIT PNG_U32(115, 66, 73, 84) michael@0: #define png_sCAL PNG_U32(115, 67, 65, 76) michael@0: #define png_sPLT PNG_U32(115, 80, 76, 84) michael@0: #define png_sRGB PNG_U32(115, 82, 71, 66) michael@0: #define png_sTER PNG_U32(115, 84, 69, 82) michael@0: #define png_tEXt PNG_U32(116, 69, 88, 116) michael@0: #define png_tIME PNG_U32(116, 73, 77, 69) michael@0: #define png_tRNS PNG_U32(116, 82, 78, 83) michael@0: #define png_zTXt PNG_U32(122, 84, 88, 116) michael@0: michael@0: #ifdef PNG_APNG_SUPPORTED michael@0: #define png_acTL PNG_U32( 97, 99, 84, 76) michael@0: #define png_fcTL PNG_U32(102, 99, 84, 76) michael@0: #define png_fdAT PNG_U32(102, 100, 65, 84) michael@0: michael@0: /* For png_struct.apng_flags: */ michael@0: #define PNG_FIRST_FRAME_HIDDEN 0x0001 michael@0: #define PNG_APNG_APP 0x0002 michael@0: #endif michael@0: michael@0: /* The following will work on (signed char*) strings, whereas the get_uint_32 michael@0: * macro will fail on top-bit-set values because of the sign extension. michael@0: */ michael@0: #define PNG_CHUNK_FROM_STRING(s)\ michael@0: PNG_U32(0xff&(s)[0], 0xff&(s)[1], 0xff&(s)[2], 0xff&(s)[3]) michael@0: michael@0: /* This uses (char), not (png_byte) to avoid warnings on systems where (char) is michael@0: * signed and the argument is a (char[]) This macro will fail miserably on michael@0: * systems where (char) is more than 8 bits. michael@0: */ michael@0: #define PNG_STRING_FROM_CHUNK(s,c)\ michael@0: (void)(((char*)(s))[0]=(char)((c)>>24), ((char*)(s))[1]=(char)((c)>>16),\ michael@0: ((char*)(s))[2]=(char)((c)>>8), ((char*)(s))[3]=(char)((c))) michael@0: michael@0: /* Do the same but terminate with a null character. */ michael@0: #define PNG_CSTRING_FROM_CHUNK(s,c)\ michael@0: (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0) michael@0: michael@0: /* Test on flag values as defined in the spec (section 5.4): */ michael@0: #define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29)) michael@0: #define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c)) michael@0: #define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21)) michael@0: #define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13)) michael@0: #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5)) michael@0: michael@0: /* Gamma values (new at libpng-1.5.4): */ michael@0: #define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */ michael@0: #define PNG_GAMMA_MAC_INVERSE 65909 michael@0: #define PNG_GAMMA_sRGB_INVERSE 45455 michael@0: michael@0: /* Almost everything below is C specific; the #defines above can be used in michael@0: * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot. michael@0: */ michael@0: #ifndef PNG_VERSION_INFO_ONLY michael@0: michael@0: #include "pngstruct.h" michael@0: #include "pnginfo.h" michael@0: michael@0: /* Validate the include paths - the include path used to generate pnglibconf.h michael@0: * must match that used in the build, or we must be using pnglibconf.h.prebuilt: michael@0: */ michael@0: #if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM michael@0: # error ZLIB_VERNUM != PNG_ZLIB_VERNUM \ michael@0: "-I (include path) error: see the notes in pngpriv.h" michael@0: /* This means that when pnglibconf.h was built the copy of zlib.h that it michael@0: * used is not the same as the one being used here. Because the build of michael@0: * libpng makes decisions to use inflateInit2 and inflateReset2 based on the michael@0: * zlib version number and because this affects handling of certain broken michael@0: * PNG files the -I directives must match. michael@0: * michael@0: * The most likely explanation is that you passed a -I in CFLAGS, this will michael@0: * not work; all the preprocessor directories and in particular all the -I michael@0: * directives must be in CPPFLAGS. michael@0: */ michael@0: #endif michael@0: michael@0: /* This is used for 16 bit gamma tables -- only the top level pointers are michael@0: * const; this could be changed: michael@0: */ michael@0: typedef const png_uint_16p * png_const_uint_16pp; michael@0: michael@0: /* Added to libpng-1.5.7: sRGB conversion tables */ michael@0: #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ michael@0: defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) michael@0: #ifdef PNG_SIMPLIFIED_READ_SUPPORTED michael@0: PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]); michael@0: /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value, michael@0: * 0..65535. This table gives the closest 16-bit answers (no errors). michael@0: */ michael@0: #endif michael@0: michael@0: PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]); michael@0: PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]); michael@0: michael@0: #define PNG_sRGB_FROM_LINEAR(linear) ((png_byte)((png_sRGB_base[(linear)>>15] +\ michael@0: ((((linear)&0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8)) michael@0: /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB michael@0: * encoded value with maximum error 0.646365. Note that the input is not a michael@0: * 16-bit value; it has been multiplied by 255! */ michael@0: #endif /* PNG_SIMPLIFIED_READ/WRITE */ michael@0: michael@0: michael@0: /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ michael@0: #ifdef __cplusplus michael@0: extern "C" { michael@0: #endif /* __cplusplus */ michael@0: michael@0: /* Internal functions; these are not exported from a DLL however because they michael@0: * are used within several of the C source files they have to be C extern. michael@0: * michael@0: * All of these functions must be declared with PNG_INTERNAL_FUNCTION. michael@0: */ michael@0: michael@0: /* Zlib support */ michael@0: #define PNG_UNEXPECTED_ZLIB_RETURN (-7) michael@0: PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret), michael@0: PNG_EMPTY); michael@0: /* Used by the zlib handling functions to ensure that z_stream::msg is always michael@0: * set before they return. michael@0: */ michael@0: michael@0: #ifdef PNG_WRITE_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr, michael@0: png_compression_bufferp *list),PNG_EMPTY); michael@0: /* Free the buffer list used by the compressed write code. */ michael@0: #endif michael@0: michael@0: #if defined(PNG_FLOATING_POINT_SUPPORTED) && \ michael@0: !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \ michael@0: (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \ michael@0: defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \ michael@0: defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \ michael@0: (defined(PNG_sCAL_SUPPORTED) && \ michael@0: defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)) michael@0: PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr, michael@0: double fp, png_const_charp text),PNG_EMPTY); michael@0: #endif michael@0: michael@0: /* Check the user version string for compatibility, returns false if the version michael@0: * numbers aren't compatible. michael@0: */ michael@0: PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr, michael@0: png_const_charp user_png_ver),PNG_EMPTY); michael@0: michael@0: /* Internal base allocator - no messages, NULL on failure to allocate. This michael@0: * does, however, call the application provided allocator and that could call michael@0: * png_error (although that would be a bug in the application implementation.) michael@0: */ michael@0: PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr, michael@0: png_alloc_size_t size),PNG_ALLOCATED); michael@0: michael@0: #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\ michael@0: defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED) michael@0: /* Internal array allocator, outputs no error or warning messages on failure, michael@0: * just returns NULL. michael@0: */ michael@0: PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr, michael@0: int nelements, size_t element_size),PNG_ALLOCATED); michael@0: michael@0: /* The same but an existing array is extended by add_elements. This function michael@0: * also memsets the new elements to 0 and copies the old elements. The old michael@0: * array is not freed or altered. michael@0: */ michael@0: PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr, michael@0: png_const_voidp array, int old_elements, int add_elements, michael@0: size_t element_size),PNG_ALLOCATED); michael@0: #endif /* text, sPLT or unknown chunks */ michael@0: michael@0: /* Magic to create a struct when there is no struct to call the user supplied michael@0: * memory allocators. Because error handling has not been set up the memory michael@0: * handlers can't safely call png_error, but this is an obscure and undocumented michael@0: * restriction so libpng has to assume that the 'free' handler, at least, might michael@0: * call png_error. michael@0: */ michael@0: PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct, michael@0: (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, michael@0: png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, michael@0: png_free_ptr free_fn),PNG_ALLOCATED); michael@0: michael@0: /* Free memory from internal libpng struct */ michael@0: PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr), michael@0: PNG_EMPTY); michael@0: michael@0: /* Free an allocated jmp_buf (always succeeds) */ michael@0: PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY); michael@0: michael@0: /* Function to allocate memory for zlib. PNGAPI is disallowed. */ michael@0: PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size), michael@0: PNG_ALLOCATED); michael@0: michael@0: /* Function to free memory for zlib. PNGAPI is disallowed. */ michael@0: PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY); michael@0: michael@0: /* Next four functions are used internally as callbacks. PNGCBAPI is required michael@0: * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to michael@0: * PNGCBAPI at 1.5.0 michael@0: */ michael@0: michael@0: PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr, michael@0: png_bytep data, png_size_t length),PNG_EMPTY); michael@0: michael@0: #ifdef PNG_PROGRESSIVE_READ_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr, michael@0: png_bytep buffer, png_size_t length),PNG_EMPTY); michael@0: #endif michael@0: michael@0: PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr, michael@0: png_bytep data, png_size_t length),PNG_EMPTY); michael@0: michael@0: #ifdef PNG_WRITE_FLUSH_SUPPORTED michael@0: # ifdef PNG_STDIO_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr), michael@0: PNG_EMPTY); michael@0: # endif michael@0: #endif michael@0: michael@0: /* Reset the CRC variable */ michael@0: PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY); michael@0: michael@0: /* Write the "data" buffer to whatever output you are using */ michael@0: PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr, michael@0: png_const_bytep data, png_size_t length),PNG_EMPTY); michael@0: michael@0: /* Read and check the PNG file signature */ michael@0: PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr, michael@0: png_inforp info_ptr),PNG_EMPTY); michael@0: michael@0: /* Read the chunk header (length + type name) */ michael@0: PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr), michael@0: PNG_EMPTY); michael@0: michael@0: /* Read data from whatever input you are using into the "data" buffer */ michael@0: PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data, michael@0: png_size_t length),PNG_EMPTY); michael@0: michael@0: /* Read bytes into buf, and update png_ptr->crc */ michael@0: PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf, michael@0: png_uint_32 length),PNG_EMPTY); michael@0: michael@0: /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ michael@0: PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr, michael@0: png_uint_32 skip),PNG_EMPTY); michael@0: michael@0: /* Read the CRC from the file and compare it to the libpng calculated CRC */ michael@0: PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY); michael@0: michael@0: /* Calculate the CRC over a section of data. Note that we are only michael@0: * passing a maximum of 64K on systems that have this as a memory limit, michael@0: * since this is the maximum buffer size we can specify. michael@0: */ michael@0: PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr, michael@0: png_const_bytep ptr, png_size_t length),PNG_EMPTY); michael@0: michael@0: #ifdef PNG_WRITE_FLUSH_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY); michael@0: #endif michael@0: michael@0: /* Write various chunks */ michael@0: michael@0: /* Write the IHDR chunk, and update the png_struct with the necessary michael@0: * information. michael@0: */ michael@0: PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr, michael@0: png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, michael@0: int compression_method, int filter_method, int interlace_method),PNG_EMPTY); michael@0: michael@0: PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr, michael@0: png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY); michael@0: michael@0: PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr, michael@0: png_const_bytep row_data, png_alloc_size_t row_data_length, int flush), michael@0: PNG_EMPTY); michael@0: michael@0: PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY); michael@0: michael@0: #ifdef PNG_WRITE_gAMA_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr, michael@0: png_fixed_point file_gamma),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_WRITE_sBIT_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr, michael@0: png_const_color_8p sbit, int color_type),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_WRITE_cHRM_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr, michael@0: const png_xy *xy), PNG_EMPTY); michael@0: /* The xy value must have been previously validated */ michael@0: #endif michael@0: michael@0: #ifdef PNG_WRITE_sRGB_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr, michael@0: int intent),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_WRITE_iCCP_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr, michael@0: png_const_charp name, png_const_bytep profile), PNG_EMPTY); michael@0: /* The profile must have been previously validated for correctness, the michael@0: * length comes from the first four bytes. Only the base, deflate, michael@0: * compression is supported. michael@0: */ michael@0: #endif michael@0: michael@0: #ifdef PNG_WRITE_sPLT_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr, michael@0: png_const_sPLT_tp palette),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_WRITE_tRNS_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr, michael@0: png_const_bytep trans, png_const_color_16p values, int number, michael@0: int color_type),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_WRITE_bKGD_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr, michael@0: png_const_color_16p values, int color_type),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_WRITE_hIST_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr, michael@0: png_const_uint_16p hist, int num_hist),PNG_EMPTY); michael@0: #endif michael@0: michael@0: /* Chunks that have keywords */ michael@0: #ifdef PNG_WRITE_tEXt_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr, michael@0: png_const_charp key, png_const_charp text, png_size_t text_len),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_WRITE_zTXt_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp michael@0: key, png_const_charp text, png_size_t text_len, int compression),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_WRITE_iTXt_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr, michael@0: int compression, png_const_charp key, png_const_charp lang, michael@0: png_const_charp lang_key, png_const_charp text),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ michael@0: PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr, michael@0: png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_WRITE_oFFs_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr, michael@0: png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_WRITE_pCAL_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr, michael@0: png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, michael@0: png_const_charp units, png_charpp params),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_WRITE_pHYs_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr, michael@0: png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, michael@0: int unit_type),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_WRITE_tIME_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr, michael@0: png_const_timep mod_time),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_WRITE_sCAL_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr, michael@0: int unit, png_const_charp width, png_const_charp height),PNG_EMPTY); michael@0: #endif michael@0: michael@0: /* Called when finished processing a row of data */ michael@0: PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr), michael@0: PNG_EMPTY); michael@0: michael@0: /* Internal use only. Called before first row of data */ michael@0: PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr), michael@0: PNG_EMPTY); michael@0: michael@0: /* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an michael@0: * array of png_ptr->width pixels. If the image is not interlaced or this michael@0: * is the final pass this just does a memcpy, otherwise the "display" flag michael@0: * is used to determine whether to copy pixels that are not in the current pass. michael@0: * michael@0: * Because 'png_do_read_interlace' (below) replicates pixels this allows this michael@0: * function to achieve the documented 'blocky' appearance during interlaced read michael@0: * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row' michael@0: * are not changed if they are not in the current pass, when display is 0. michael@0: * michael@0: * 'display' must be 0 or 1, otherwise the memcpy will be done regardless. michael@0: * michael@0: * The API always reads from the png_struct row buffer and always assumes that michael@0: * it is full width (png_do_read_interlace has already been called.) michael@0: * michael@0: * This function is only ever used to write to row buffers provided by the michael@0: * caller of the relevant libpng API and the row must have already been michael@0: * transformed by the read transformations. michael@0: * michael@0: * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed michael@0: * bitmasks for use within the code, otherwise runtime generated masks are used. michael@0: * The default is compile time masks. michael@0: */ michael@0: #ifndef PNG_USE_COMPILE_TIME_MASKS michael@0: # define PNG_USE_COMPILE_TIME_MASKS 1 michael@0: #endif michael@0: PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr, michael@0: png_bytep row, int display),PNG_EMPTY); michael@0: michael@0: #ifdef PNG_READ_INTERLACING_SUPPORTED michael@0: /* Expand an interlaced row: the 'row_info' describes the pass data that has michael@0: * been read in and must correspond to the pixels in 'row', the pixels are michael@0: * expanded (moved apart) in 'row' to match the final layout, when doing this michael@0: * the pixels are *replicated* to the intervening space. This is essential for michael@0: * the correct operation of png_combine_row, above. michael@0: */ michael@0: PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info, michael@0: png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY); michael@0: #endif michael@0: michael@0: /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ michael@0: michael@0: #ifdef PNG_WRITE_INTERLACING_SUPPORTED michael@0: /* Grab pixels out of a row for an interlaced pass */ michael@0: PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info, michael@0: png_bytep row, int pass),PNG_EMPTY); michael@0: #endif michael@0: michael@0: /* Unfilter a row: check the filter value before calling this, there is no point michael@0: * calling it for PNG_FILTER_VALUE_NONE. michael@0: */ michael@0: PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop michael@0: row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY); michael@0: michael@0: PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info, michael@0: png_bytep row, png_const_bytep prev_row),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop michael@0: row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop michael@0: row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop michael@0: row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop michael@0: row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop michael@0: row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop michael@0: row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); michael@0: michael@0: /* Choose the best filter to use and filter the row data */ michael@0: PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr, michael@0: png_row_infop row_info),PNG_EMPTY); michael@0: michael@0: #ifdef PNG_SEQUENTIAL_READ_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr, michael@0: png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY); michael@0: /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer michael@0: * is NULL the function checks, instead, for the end of the stream. In this michael@0: * case a benign error will be issued if the stream end is not found or if michael@0: * extra data has to be consumed. michael@0: */ michael@0: PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr), michael@0: PNG_EMPTY); michael@0: /* This cleans up when the IDAT LZ stream does not end when the last image michael@0: * byte is read; there is still some pending input. michael@0: */ michael@0: michael@0: PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr), michael@0: PNG_EMPTY); michael@0: /* Finish a row while reading, dealing with interlacing passes, etc. */ michael@0: #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ michael@0: michael@0: /* Initialize the row buffers, etc. */ michael@0: PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY); michael@0: michael@0: #ifdef PNG_READ_TRANSFORMS_SUPPORTED michael@0: /* Optional call to update the users info structure */ michael@0: PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr, michael@0: png_inforp info_ptr),PNG_EMPTY); michael@0: #endif michael@0: michael@0: /* Shared transform functions, defined in pngtran.c */ michael@0: #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ michael@0: defined(PNG_READ_STRIP_ALPHA_SUPPORTED) michael@0: PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info, michael@0: png_bytep row, int at_start),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_16BIT_SUPPORTED michael@0: #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) michael@0: PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info, michael@0: png_bytep row),PNG_EMPTY); michael@0: #endif michael@0: #endif michael@0: michael@0: #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ michael@0: defined(PNG_WRITE_PACKSWAP_SUPPORTED) michael@0: PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info, michael@0: png_bytep row),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) michael@0: PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info, michael@0: png_bytep row),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) michael@0: PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info, michael@0: png_bytep row),PNG_EMPTY); michael@0: #endif michael@0: michael@0: /* The following decodes the appropriate chunks, and does error correction, michael@0: * then calls the appropriate callback for the chunk if it is valid. michael@0: */ michael@0: michael@0: /* Decode the IHDR chunk */ michael@0: PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr, michael@0: png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr, michael@0: png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr, michael@0: png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); michael@0: michael@0: #ifdef PNG_READ_bKGD_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr, michael@0: png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_READ_cHRM_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr, michael@0: png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_READ_gAMA_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr, michael@0: png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_READ_hIST_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr, michael@0: png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_READ_iCCP_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr, michael@0: png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); michael@0: #endif /* PNG_READ_iCCP_SUPPORTED */ michael@0: michael@0: #ifdef PNG_READ_iTXt_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr, michael@0: png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_READ_oFFs_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr, michael@0: png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_READ_pCAL_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr, michael@0: png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_READ_pHYs_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr, michael@0: png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_READ_sBIT_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr, michael@0: png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_READ_sCAL_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr, michael@0: png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_READ_sPLT_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr, michael@0: png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); michael@0: #endif /* PNG_READ_sPLT_SUPPORTED */ michael@0: michael@0: #ifdef PNG_READ_sRGB_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr, michael@0: png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_READ_tEXt_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr, michael@0: png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_READ_tIME_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr, michael@0: png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_READ_tRNS_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr, michael@0: png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_READ_zTXt_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr, michael@0: png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); michael@0: #endif michael@0: michael@0: PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_structrp png_ptr, michael@0: png_uint_32 chunk_name),PNG_EMPTY); michael@0: michael@0: PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr, michael@0: png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY); michael@0: /* This is the function that gets called for unknown chunks. The 'keep' michael@0: * argument is either non-zero for a known chunk that has been set to be michael@0: * handled as unknown or zero for an unknown chunk. By default the function michael@0: * just skips the chunk or errors out if it is critical. michael@0: */ michael@0: michael@0: #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\ michael@0: defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) michael@0: PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling, michael@0: (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY); michael@0: /* Exactly as the API png_handle_as_unknown() except that the argument is a michael@0: * 32-bit chunk name, not a string. michael@0: */ michael@0: #endif /* READ_UNKNOWN_CHUNKS || HANDLE_AS_UNKNOWN */ michael@0: michael@0: /* Handle the transformations for reading and writing */ michael@0: #ifdef PNG_READ_TRANSFORMS_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr, michael@0: png_row_infop row_info),PNG_EMPTY); michael@0: #endif michael@0: #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr, michael@0: png_row_infop row_info),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_READ_TRANSFORMS_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr), michael@0: PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_PROGRESSIVE_READ_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr, michael@0: png_inforp info_ptr),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr, michael@0: png_inforp info_ptr),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_push_crc_skip,(png_structrp png_ptr, michael@0: png_uint_32 length),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_push_crc_finish,(png_structrp png_ptr), michael@0: PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr), michael@0: PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr, michael@0: png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr, michael@0: png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr), michael@0: PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr, michael@0: png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr, michael@0: png_inforp info_ptr),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr, michael@0: png_inforp info_ptr),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr, michael@0: png_bytep row),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr, michael@0: png_inforp info_ptr),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr, michael@0: png_inforp info_ptr),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr), michael@0: PNG_EMPTY); michael@0: # ifdef PNG_READ_tEXt_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr, michael@0: png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr, michael@0: png_inforp info_ptr),PNG_EMPTY); michael@0: # endif michael@0: # ifdef PNG_READ_zTXt_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr, michael@0: png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr, michael@0: png_inforp info_ptr),PNG_EMPTY); michael@0: # endif michael@0: # ifdef PNG_READ_iTXt_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr, michael@0: png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr, michael@0: png_inforp info_ptr),PNG_EMPTY); michael@0: # endif michael@0: michael@0: #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ michael@0: michael@0: #ifdef PNG_APNG_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_ensure_fcTL_is_valid,(png_structp png_ptr, michael@0: png_uint_32 width, png_uint_32 height, michael@0: png_uint_32 x_offset, png_uint_32 y_offset, michael@0: png_uint_16 delay_num, png_uint_16 delay_den, michael@0: png_byte dispose_op, png_byte blend_op),PNG_EMPTY); michael@0: michael@0: #ifdef PNG_READ_APNG_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_handle_acTL,(png_structp png_ptr, michael@0: png_infop info_ptr, png_uint_32 length),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_handle_fcTL,(png_structp png_ptr, michael@0: png_infop info_ptr, png_uint_32 length),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_handle_fdAT,(png_structp png_ptr, michael@0: png_infop info_ptr, png_uint_32 length),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_have_info,(png_structp png_ptr, michael@0: png_infop info_ptr),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_ensure_sequence_number,(png_structp png_ptr, michael@0: png_uint_32 length),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_read_reset,(png_structp png_ptr),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_read_reinit,(png_structp png_ptr, michael@0: png_infop info_ptr),PNG_EMPTY); michael@0: #ifdef PNG_PROGRESSIVE_READ_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_progressive_read_reset,(png_structp png_ptr), michael@0: PNG_EMPTY); michael@0: #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ michael@0: #endif /* PNG_READ_APNG_SUPPORTED */ michael@0: michael@0: #ifdef PNG_WRITE_APNG_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_write_acTL,(png_structp png_ptr, michael@0: png_uint_32 num_frames, png_uint_32 num_plays),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_write_fcTL,(png_structp png_ptr, michael@0: png_uint_32 width, png_uint_32 height, michael@0: png_uint_32 x_offset, png_uint_32 y_offset, michael@0: png_uint_16 delay_num, png_uint_16 delay_den, michael@0: png_byte dispose_op, png_byte blend_op),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_write_fdAT,(png_structp png_ptr, michael@0: png_const_bytep data, png_size_t length),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_write_reset,(png_structp png_ptr),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_write_reinit,(png_structp png_ptr, michael@0: png_infop info_ptr, png_uint_32 width, png_uint_32 height),PNG_EMPTY); michael@0: #endif /* PNG_WRITE_APNG_SUPPORTED */ michael@0: #endif /* PNG_APNG_SUPPORTED */ michael@0: michael@0: /* Added at libpng version 1.6.0 */ michael@0: #ifdef PNG_GAMMA_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr, michael@0: png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY); michael@0: /* Set the colorspace gamma with a value provided by the application or by michael@0: * the gAMA chunk on read. The value will override anything set by an ICC michael@0: * profile. michael@0: */ michael@0: michael@0: PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr, michael@0: png_inforp info_ptr), PNG_EMPTY); michael@0: /* Synchronize the info 'valid' flags with the colorspace */ michael@0: michael@0: PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr, michael@0: png_inforp info_ptr), PNG_EMPTY); michael@0: /* Copy the png_struct colorspace to the info_struct and call the above to michael@0: * synchronize the flags. Checks for NULL info_ptr and does nothing. michael@0: */ michael@0: #endif michael@0: michael@0: /* Added at libpng version 1.4.0 */ michael@0: #ifdef PNG_COLORSPACE_SUPPORTED michael@0: /* These internal functions are for maintaining the colorspace structure within michael@0: * a png_info or png_struct (or, indeed, both). michael@0: */ michael@0: PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities, michael@0: (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy, michael@0: int preferred), PNG_EMPTY); michael@0: michael@0: PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints, michael@0: (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ, michael@0: int preferred), PNG_EMPTY); michael@0: michael@0: #ifdef PNG_sRGB_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr, michael@0: png_colorspacerp colorspace, int intent), PNG_EMPTY); michael@0: /* This does set the colorspace gAMA and cHRM values too, but doesn't set the michael@0: * flags to write them, if it returns false there was a problem and an error michael@0: * message has already been output (but the colorspace may still need to be michael@0: * synced to record the invalid flag). michael@0: */ michael@0: #endif /* sRGB */ michael@0: michael@0: #ifdef PNG_iCCP_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr, michael@0: png_colorspacerp colorspace, png_const_charp name, michael@0: png_uint_32 profile_length, png_const_bytep profile, int color_type), michael@0: PNG_EMPTY); michael@0: /* The 'name' is used for information only */ michael@0: michael@0: /* Routines for checking parts of an ICC profile. */ michael@0: PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr, michael@0: png_colorspacerp colorspace, png_const_charp name, michael@0: png_uint_32 profile_length), PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr, michael@0: png_colorspacerp colorspace, png_const_charp name, michael@0: png_uint_32 profile_length, michael@0: png_const_bytep profile /* first 132 bytes only */, int color_type), michael@0: PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr, michael@0: png_colorspacerp colorspace, png_const_charp name, michael@0: png_uint_32 profile_length, michael@0: png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY); michael@0: #ifdef PNG_sRGB_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,( michael@0: png_const_structrp png_ptr, png_colorspacerp colorspace, michael@0: png_const_bytep profile, uLong adler), PNG_EMPTY); michael@0: /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may michael@0: * be zero to indicate that it is not available. It is used, if provided, michael@0: * as a fast check on the profile when checking to see if it is sRGB. michael@0: */ michael@0: #endif michael@0: #endif /* iCCP */ michael@0: michael@0: #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients, michael@0: (png_structrp png_ptr), PNG_EMPTY); michael@0: /* Set the rgb_to_gray coefficients from the colorspace Y values */ michael@0: #endif /* READ_RGB_TO_GRAY */ michael@0: #endif /* COLORSPACE */ michael@0: michael@0: /* Added at libpng version 1.4.0 */ michael@0: PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr, michael@0: png_uint_32 width, png_uint_32 height, int bit_depth, michael@0: int color_type, int interlace_type, int compression_type, michael@0: int filter_type),PNG_EMPTY); michael@0: michael@0: /* Added at libpng version 1.5.10 */ michael@0: #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \ michael@0: defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED) michael@0: PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes, michael@0: (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) michael@0: PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr, michael@0: png_const_charp name),PNG_NORETURN); michael@0: #endif michael@0: michael@0: /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite michael@0: * the end. Always leaves the buffer nul terminated. Never errors out (and michael@0: * there is no error code.) michael@0: */ michael@0: PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize, michael@0: size_t pos, png_const_charp string),PNG_EMPTY); michael@0: michael@0: /* Various internal functions to handle formatted warning messages, currently michael@0: * only implemented for warnings. michael@0: */ michael@0: #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) michael@0: /* Utility to dump an unsigned value into a buffer, given a start pointer and michael@0: * and end pointer (which should point just *beyond* the end of the buffer!) michael@0: * Returns the pointer to the start of the formatted string. This utility only michael@0: * does unsigned values. michael@0: */ michael@0: PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start, michael@0: png_charp end, int format, png_alloc_size_t number),PNG_EMPTY); michael@0: michael@0: /* Convenience macro that takes an array: */ michael@0: #define PNG_FORMAT_NUMBER(buffer,format,number) \ michael@0: png_format_number(buffer, buffer + (sizeof buffer), format, number) michael@0: michael@0: /* Suggested size for a number buffer (enough for 64 bits and a sign!) */ michael@0: #define PNG_NUMBER_BUFFER_SIZE 24 michael@0: michael@0: /* These are the integer formats currently supported, the name is formed from michael@0: * the standard printf(3) format string. michael@0: */ michael@0: #define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */ michael@0: #define PNG_NUMBER_FORMAT_02u 2 michael@0: #define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */ michael@0: #define PNG_NUMBER_FORMAT_02d 2 michael@0: #define PNG_NUMBER_FORMAT_x 3 michael@0: #define PNG_NUMBER_FORMAT_02x 4 michael@0: #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */ michael@0: #endif michael@0: michael@0: #ifdef PNG_WARNINGS_SUPPORTED michael@0: /* New defines and members adding in libpng-1.5.4 */ michael@0: # define PNG_WARNING_PARAMETER_SIZE 32 michael@0: # define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */ michael@0: michael@0: /* An l-value of this type has to be passed to the APIs below to cache the michael@0: * values of the parameters to a formatted warning message. michael@0: */ michael@0: typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][ michael@0: PNG_WARNING_PARAMETER_SIZE]; michael@0: michael@0: PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p, michael@0: int number, png_const_charp string),PNG_EMPTY); michael@0: /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters, michael@0: * including the trailing '\0'. michael@0: */ michael@0: PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned, michael@0: (png_warning_parameters p, int number, int format, png_alloc_size_t value), michael@0: PNG_EMPTY); michael@0: /* Use png_alloc_size_t because it is an unsigned type as big as any we michael@0: * need to output. Use the following for a signed value. michael@0: */ michael@0: PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed, michael@0: (png_warning_parameters p, int number, int format, png_int_32 value), michael@0: PNG_EMPTY); michael@0: michael@0: PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr, michael@0: png_warning_parameters p, png_const_charp message),PNG_EMPTY); michael@0: /* 'message' follows the X/Open approach of using @1, @2 to insert michael@0: * parameters previously supplied using the above functions. Errors in michael@0: * specifying the parameters will simply result in garbage substitutions. michael@0: */ michael@0: #endif michael@0: michael@0: #ifdef PNG_BENIGN_ERRORS_SUPPORTED michael@0: /* Application errors (new in 1.6); use these functions (declared below) for michael@0: * errors in the parameters or order of API function calls on read. The michael@0: * 'warning' should be used for an error that can be handled completely; the michael@0: * 'error' for one which can be handled safely but which may lose application michael@0: * information or settings. michael@0: * michael@0: * By default these both result in a png_error call prior to release, while in a michael@0: * released version the 'warning' is just a warning. However if the application michael@0: * explicitly disables benign errors (explicitly permitting the code to lose michael@0: * information) they both turn into warnings. michael@0: * michael@0: * If benign errors aren't supported they end up as the corresponding base call michael@0: * (png_warning or png_error.) michael@0: */ michael@0: PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr, michael@0: png_const_charp message),PNG_EMPTY); michael@0: /* The application provided invalid parameters to an API function or called michael@0: * an API function at the wrong time, libpng can completely recover. michael@0: */ michael@0: michael@0: PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr, michael@0: png_const_charp message),PNG_EMPTY); michael@0: /* As above but libpng will ignore the call, or attempt some other partial michael@0: * recovery from the error. michael@0: */ michael@0: #else michael@0: # define png_app_warning(pp,s) png_warning(pp,s) michael@0: # define png_app_error(pp,s) png_error(pp,s) michael@0: #endif michael@0: michael@0: PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr, michael@0: png_const_charp message, int error),PNG_EMPTY); michael@0: /* Report a recoverable issue in chunk data. On read this is used to report michael@0: * a problem found while reading a particular chunk and the michael@0: * png_chunk_benign_error or png_chunk_warning function is used as michael@0: * appropriate. On write this is used to report an error that comes from michael@0: * data set via an application call to a png_set_ API and png_app_error or michael@0: * png_app_warning is used as appropriate. michael@0: * michael@0: * The 'error' parameter must have one of the following values: michael@0: */ michael@0: #define PNG_CHUNK_WARNING 0 /* never an error */ michael@0: #define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */ michael@0: #define PNG_CHUNK_ERROR 2 /* always an error */ michael@0: michael@0: /* ASCII to FP interfaces, currently only implemented if sCAL michael@0: * support is required. michael@0: */ michael@0: #if defined(PNG_sCAL_SUPPORTED) michael@0: /* MAX_DIGITS is actually the maximum number of characters in an sCAL michael@0: * width or height, derived from the precision (number of significant michael@0: * digits - a build time settable option) and assumptions about the michael@0: * maximum ridiculous exponent. michael@0: */ michael@0: #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/) michael@0: michael@0: #ifdef PNG_FLOATING_POINT_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr, michael@0: png_charp ascii, png_size_t size, double fp, unsigned int precision), michael@0: PNG_EMPTY); michael@0: #endif /* FLOATING_POINT */ michael@0: michael@0: #ifdef PNG_FIXED_POINT_SUPPORTED michael@0: PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr, michael@0: png_charp ascii, png_size_t size, png_fixed_point fp),PNG_EMPTY); michael@0: #endif /* FIXED_POINT */ michael@0: #endif /* sCAL */ michael@0: michael@0: #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) michael@0: /* An internal API to validate the format of a floating point number. michael@0: * The result is the index of the next character. If the number is michael@0: * not valid it will be the index of a character in the supposed number. michael@0: * michael@0: * The format of a number is defined in the PNG extensions specification michael@0: * and this API is strictly conformant to that spec, not anyone elses! michael@0: * michael@0: * The format as a regular expression is: michael@0: * michael@0: * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)? michael@0: * michael@0: * or: michael@0: * michael@0: * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)? michael@0: * michael@0: * The complexity is that either integer or fraction must be present and the michael@0: * fraction is permitted to have no digits only if the integer is present. michael@0: * michael@0: * NOTE: The dangling E problem. michael@0: * There is a PNG valid floating point number in the following: michael@0: * michael@0: * PNG floating point numbers are not greedy. michael@0: * michael@0: * Working this out requires *TWO* character lookahead (because of the michael@0: * sign), the parser does not do this - it will fail at the 'r' - this michael@0: * doesn't matter for PNG sCAL chunk values, but it requires more care michael@0: * if the value were ever to be embedded in something more complex. Use michael@0: * ANSI-C strtod if you need the lookahead. michael@0: */ michael@0: /* State table for the parser. */ michael@0: #define PNG_FP_INTEGER 0 /* before or in integer */ michael@0: #define PNG_FP_FRACTION 1 /* before or in fraction */ michael@0: #define PNG_FP_EXPONENT 2 /* before or in exponent */ michael@0: #define PNG_FP_STATE 3 /* mask for the above */ michael@0: #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */ michael@0: #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */ michael@0: #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */ michael@0: #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */ michael@0: #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */ michael@0: michael@0: /* These three values don't affect the parser. They are set but not used. michael@0: */ michael@0: #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */ michael@0: #define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */ michael@0: #define PNG_FP_NONZERO 256 /* A non-zero value */ michael@0: #define PNG_FP_STICKY 448 /* The above three flags */ michael@0: michael@0: /* This is available for the caller to store in 'state' if required. Do not michael@0: * call the parser after setting it (the parser sometimes clears it.) michael@0: */ michael@0: #define PNG_FP_INVALID 512 /* Available for callers as a distinct value */ michael@0: michael@0: /* Result codes for the parser (boolean - true meants ok, false means michael@0: * not ok yet.) michael@0: */ michael@0: #define PNG_FP_MAYBE 0 /* The number may be valid in the future */ michael@0: #define PNG_FP_OK 1 /* The number is valid */ michael@0: michael@0: /* Tests on the sticky non-zero and negative flags. To pass these checks michael@0: * the state must also indicate that the whole number is valid - this is michael@0: * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this michael@0: * is equivalent to PNG_FP_OK above.) michael@0: */ michael@0: #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO) michael@0: /* NZ_MASK: the string is valid and a non-zero negative value */ michael@0: #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO) michael@0: /* Z MASK: the string is valid and a non-zero value. */ michael@0: /* PNG_FP_SAW_DIGIT: the string is valid. */ michael@0: #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT) michael@0: #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK) michael@0: #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK) michael@0: michael@0: /* The actual parser. This can be called repeatedly. It updates michael@0: * the index into the string and the state variable (which must michael@0: * be initialized to 0). It returns a result code, as above. There michael@0: * is no point calling the parser any more if it fails to advance to michael@0: * the end of the string - it is stuck on an invalid character (or michael@0: * terminated by '\0'). michael@0: * michael@0: * Note that the pointer will consume an E or even an E+ and then leave michael@0: * a 'maybe' state even though a preceding integer.fraction is valid. michael@0: * The PNG_FP_WAS_VALID flag indicates that a preceding substring was michael@0: * a valid number. It's possible to recover from this by calling michael@0: * the parser again (from the start, with state 0) but with a string michael@0: * that omits the last character (i.e. set the size to the index of michael@0: * the problem character.) This has not been tested within libpng. michael@0: */ michael@0: PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string, michael@0: png_size_t size, int *statep, png_size_tp whereami),PNG_EMPTY); michael@0: michael@0: /* This is the same but it checks a complete string and returns true michael@0: * only if it just contains a floating point number. As of 1.5.4 this michael@0: * function also returns the state at the end of parsing the number if michael@0: * it was valid (otherwise it returns 0.) This can be used for testing michael@0: * for negative or zero values using the sticky flag. michael@0: */ michael@0: PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string, michael@0: png_size_t size),PNG_EMPTY); michael@0: #endif /* pCAL || sCAL */ michael@0: michael@0: #if defined(PNG_GAMMA_SUPPORTED) ||\ michael@0: defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED) michael@0: /* Added at libpng version 1.5.0 */ michael@0: /* This is a utility to provide a*times/div (rounded) and indicate michael@0: * if there is an overflow. The result is a boolean - false (0) michael@0: * for overflow, true (1) if no overflow, in which case *res michael@0: * holds the result. michael@0: */ michael@0: PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a, michael@0: png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED) michael@0: /* Same deal, but issue a warning on overflow and return 0. */ michael@0: PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn, michael@0: (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by, michael@0: png_int_32 divided_by),PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_GAMMA_SUPPORTED michael@0: /* Calculate a reciprocal - used for gamma values. This returns michael@0: * 0 if the argument is 0 in order to maintain an undefined value; michael@0: * there are no warnings. michael@0: */ michael@0: PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a), michael@0: PNG_EMPTY); michael@0: michael@0: #ifdef PNG_READ_GAMMA_SUPPORTED michael@0: /* The same but gives a reciprocal of the product of two fixed point michael@0: * values. Accuracy is suitable for gamma calculations but this is michael@0: * not exact - use png_muldiv for that. Only required at present on read. michael@0: */ michael@0: PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a, michael@0: png_fixed_point b),PNG_EMPTY); michael@0: #endif michael@0: michael@0: /* Return true if the gamma value is significantly different from 1.0 */ michael@0: PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value), michael@0: PNG_EMPTY); michael@0: #endif michael@0: michael@0: #ifdef PNG_READ_GAMMA_SUPPORTED michael@0: /* Internal fixed point gamma correction. These APIs are called as michael@0: * required to convert single values - they don't need to be fast, michael@0: * they are not used when processing image pixel values. michael@0: * michael@0: * While the input is an 'unsigned' value it must actually be the michael@0: * correct bit value - 0..255 or 0..65535 as required. michael@0: */ michael@0: PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr, michael@0: unsigned int value, png_fixed_point gamma_value),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value, michael@0: png_fixed_point gamma_value),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value, michael@0: png_fixed_point gamma_value),PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr), michael@0: PNG_EMPTY); michael@0: PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr, michael@0: int bit_depth),PNG_EMPTY); michael@0: #endif michael@0: michael@0: /* SIMPLIFIED READ/WRITE SUPPORT */ michael@0: #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ michael@0: defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) michael@0: /* The internal structure that png_image::opaque points to. */ michael@0: typedef struct png_control michael@0: { michael@0: png_structp png_ptr; michael@0: png_infop info_ptr; michael@0: png_voidp error_buf; /* Always a jmp_buf at present. */ michael@0: michael@0: png_const_bytep memory; /* Memory buffer. */ michael@0: png_size_t size; /* Size of the memory buffer. */ michael@0: michael@0: unsigned int for_write :1; /* Otherwise it is a read structure */ michael@0: unsigned int owned_file :1; /* We own the file in io_ptr */ michael@0: } png_control; michael@0: michael@0: /* Return the pointer to the jmp_buf from a png_control: necessary because C michael@0: * does not reveal the type of the elements of jmp_buf. michael@0: */ michael@0: #ifdef __cplusplus michael@0: # define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0]) michael@0: #else michael@0: # define png_control_jmp_buf(pc) ((pc)->error_buf) michael@0: #endif michael@0: michael@0: /* Utility to safely execute a piece of libpng code catching and logging any michael@0: * errors that might occur. Returns true on success, false on failure (either michael@0: * of the function or as a result of a png_error.) michael@0: */ michael@0: PNG_INTERNAL_CALLBACK(void,png_safe_error,(png_structp png_ptr, michael@0: png_const_charp error_message),PNG_NORETURN); michael@0: michael@0: #ifdef PNG_WARNINGS_SUPPORTED michael@0: PNG_INTERNAL_CALLBACK(void,png_safe_warning,(png_structp png_ptr, michael@0: png_const_charp warning_message),PNG_EMPTY); michael@0: #else michael@0: # define png_safe_warning 0/*dummy argument*/ michael@0: #endif michael@0: michael@0: PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image, michael@0: int (*function)(png_voidp), png_voidp arg),PNG_EMPTY); michael@0: michael@0: /* Utility to log an error; this also cleans up the png_image; the function michael@0: * always returns 0 (false). michael@0: */ michael@0: PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image, michael@0: png_const_charp error_message),PNG_EMPTY); michael@0: michael@0: #ifndef PNG_SIMPLIFIED_READ_SUPPORTED michael@0: /* png_image_free is used by the write code but not exported */ michael@0: PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY); michael@0: #endif /* !SIMPLIFIED_READ */ michael@0: michael@0: #endif /* SIMPLIFIED READ/WRITE */ michael@0: michael@0: /* These are initialization functions for hardware specific PNG filter michael@0: * optimizations; list these here then select the appropriate one at compile michael@0: * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined michael@0: * the generic code is used. michael@0: */ michael@0: #ifdef PNG_FILTER_OPTIMIZATIONS michael@0: PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr, michael@0: unsigned int bpp), PNG_EMPTY); michael@0: /* Just declare the optimization that will be used */ michael@0: #else michael@0: /* List *all* the possible optimizations here - this branch is required if michael@0: * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in michael@0: * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing. michael@0: */ michael@0: PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon, michael@0: (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); michael@0: #endif michael@0: michael@0: /* Maintainer: Put new private prototypes here ^ */ michael@0: michael@0: #include "pngdebug.h" michael@0: michael@0: #ifdef __cplusplus michael@0: } michael@0: #endif michael@0: michael@0: #endif /* PNG_VERSION_INFO_ONLY */ michael@0: #endif /* PNGPRIV_H */