/* pngpriv.h - private declarations for use inside libpng

*

* Last changed in libpng 1.6.35 [July 15, 2018]

* Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson

* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)

* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)

*

* This code is released under the libpng license.

* For conditions of distribution and use, see the disclaimer

* and license in png.h

*/

/* The symbols declared in this file (including the functions declared

* as extern) are PRIVATE. They are not part of the libpng public

* interface, and are not recommended for use by regular applications.

* Some of them may become public in the future; others may stay private,

* change in an incompatible way, or even disappear.

* Although the libpng users are not forbidden to include this header,

* they should be well aware of the issues that may arise from doing so.

*/

#ifndef PNGPRIV_H

#define PNGPRIV_H

/* Feature Test Macros. The following are defined here to ensure that correctly

* implemented libraries reveal the APIs libpng needs to build and hide those

* that are not needed and potentially damaging to the compilation.

*

* Feature Test Macros must be defined before any system header is included (see

* POSIX 1003.1 2.8.2 "POSIX Symbols."

*

* These macros only have an effect if the operating system supports either

* POSIX 1003.1 or C99, or both. On other operating systems (particularly

* Windows/Visual Studio) there is no effect; the OS specific tests below are

* still required (as of 2011-05-02.)

*/

#ifndef _POSIX_SOURCE

# define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */

#endif

#ifndef PNG_VERSION_INFO_ONLY

/* Standard library headers not required by png.h: */

# include <stdlib.h>

# include <string.h>

#endif

#define PNGLIB_BUILD /*libpng is being built, not used*/

/* If HAVE_CONFIG_H is defined during the build then the build system must

* provide an appropriate "config.h" file on the include path. The header file

* must provide definitions as required below (search for "HAVE_CONFIG_H");

* see configure.ac for more details of the requirements. The macro

* "PNG_NO_CONFIG_H" is provided for maintainers to test for dependencies on

* 'configure'; define this macro to prevent the configure build including the

* configure generated config.h. Libpng is expected to compile without *any*

* special build system support on a reasonably ANSI-C compliant system.

*/

#if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H)

# include <config.h>

/* Pick up the definition of 'restrict' from config.h if it was read: */

# define PNG_RESTRICT restrict

#endif

/* To support symbol prefixing it is necessary to know *before* including png.h

* whether the fixed point (and maybe other) APIs are exported, because if they

* are not internal definitions may be required. This is handled below just

* before png.h is included, but load the configuration now if it is available.

*/

#ifndef PNGLCONF_H

# include "pnglibconf.h"

#endif

/* Local renames may change non-exported API functions from png.h */

#if defined(PNG_PREFIX) && !defined(PNGPREFIX_H)

# include "pngprefix.h"

#endif

#ifdef PNG_USER_CONFIG

# include "pngusr.h"

/* These should have been defined in pngusr.h */

# ifndef PNG_USER_PRIVATEBUILD

# define PNG_USER_PRIVATEBUILD "Custom libpng build"

# endif

# ifndef PNG_USER_DLLFNAME_POSTFIX

# define PNG_USER_DLLFNAME_POSTFIX "Cb"

# endif

#endif

/* Compile time options.

* =====================

* In a multi-arch build the compiler may compile the code several times for the

* same object module, producing different binaries for different architectures.

* When this happens configure-time setting of the target host options cannot be

* done and this interferes with the handling of the ARM NEON optimizations, and

* possibly other similar optimizations. Put additional tests here; in general

* this is needed when the same option can be changed at both compile time and

* run time depending on the target OS (i.e. iOS vs Android.)

*

* NOTE: symbol prefixing does not pass $(CFLAGS) to the preprocessor, because

* this is not possible with certain compilers (Oracle SUN OS CC), as a result

* it is necessary to ensure that all extern functions that *might* be used

* regardless of $(CFLAGS) get declared in this file. The test on __ARM_NEON__

* below is one example of this behavior because it is controlled by the

* presence or not of -mfpu=neon on the GCC command line, it is possible to do

* this in $(CC), e.g. "CC=gcc -mfpu=neon", but people who build libpng rarely

* do this.

*/

#ifndef PNG_ARM_NEON_OPT

/* ARM NEON optimizations are being controlled by the compiler settings,

* typically the target FPU. If the FPU has been set to NEON (-mfpu=neon

* with GCC) then the compiler will define __ARM_NEON__ and we can rely

* unconditionally on NEON instructions not crashing, otherwise we must

* disable use of NEON instructions.

*

* NOTE: at present these optimizations depend on 'ALIGNED_MEMORY', so they

* can only be turned on automatically if that is supported too. If

* PNG_ARM_NEON_OPT is set in CPPFLAGS (to >0) then arm/arm_init.c will fail

* to compile with an appropriate #error if ALIGNED_MEMORY has been turned

* off.

*

* Note that gcc-4.9 defines __ARM_NEON instead of the deprecated

* __ARM_NEON__, so we check both variants.

*

* To disable ARM_NEON optimizations entirely, and skip compiling the

* associated assembler code, pass --enable-arm-neon=no to configure

* or put -DPNG_ARM_NEON_OPT=0 in CPPFLAGS.

*/

# if (defined(__ARM_NEON__) || defined(__ARM_NEON)) && \

defined(PNG_ALIGNED_MEMORY_SUPPORTED)

# define PNG_ARM_NEON_OPT 2

# else

# define PNG_ARM_NEON_OPT 0

# endif

#endif

#if PNG_ARM_NEON_OPT > 0

/* NEON optimizations are to be at least considered by libpng, so enable the

* callbacks to do this.

*/

# define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_neon

/* By default the 'intrinsics' code in arm/filter_neon_intrinsics.c is used

* if possible - if __ARM_NEON__ is set and the compiler version is not known

* to be broken. This is controlled by PNG_ARM_NEON_IMPLEMENTATION which can

* be:

*

* 1 The intrinsics code (the default with __ARM_NEON__)

* 2 The hand coded assembler (the default without __ARM_NEON__)

*

* It is possible to set PNG_ARM_NEON_IMPLEMENTATION in CPPFLAGS, however

* this is *NOT* supported and may cease to work even after a minor revision

* to libpng. It *is* valid to do this for testing purposes, e.g. speed

* testing or a new compiler, but the results should be communicated to the

* libpng implementation list for incorporation in the next minor release.

*/

# ifndef PNG_ARM_NEON_IMPLEMENTATION

# if defined(__ARM_NEON__) || defined(__ARM_NEON)

# if defined(__clang__)

/* At present it is unknown by the libpng developers which versions

* of clang support the intrinsics, however some or perhaps all

* versions do not work with the assembler so this may be

* irrelevant, so just use the default (do nothing here.)

*/

# elif defined(__GNUC__)

/* GCC 4.5.4 NEON support is known to be broken. 4.6.3 is known to

* work, so if this *is* GCC, or G++, look for a version >4.5

*/

# if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)

# define PNG_ARM_NEON_IMPLEMENTATION 2

# endif /* no GNUC support */

# endif /* __GNUC__ */

# else /* !defined __ARM_NEON__ */

/* The 'intrinsics' code simply won't compile without this -mfpu=neon:

*/

# define PNG_ARM_NEON_IMPLEMENTATION 2

# endif /* __ARM_NEON__ */

# endif /* !PNG_ARM_NEON_IMPLEMENTATION */

# ifndef PNG_ARM_NEON_IMPLEMENTATION

/* Use the intrinsics code by default. */

# define PNG_ARM_NEON_IMPLEMENTATION 1

# endif

#endif /* PNG_ARM_NEON_OPT > 0 */

#ifndef PNG_MIPS_MSA_OPT

# if defined(__mips_msa) && (__mips_isa_rev >= 5) && defined(PNG_ALIGNED_MEMORY_SUPPORTED)

# define PNG_MIPS_MSA_OPT 2

# else

# define PNG_MIPS_MSA_OPT 0

# endif

#endif

#ifndef PNG_POWERPC_VSX_OPT

# if defined(__PPC64__) && defined(__ALTIVEC__) && defined(__VSX__)

# define PNG_POWERPC_VSX_OPT 2

# else

# define PNG_POWERPC_VSX_OPT 0

# endif

#endif

#ifndef PNG_INTEL_SSE_OPT

# ifdef PNG_INTEL_SSE

/* Only check for SSE if the build configuration has been modified to

* enable SSE optimizations. This means that these optimizations will

* be off by default. See contrib/intel for more details.

*/

# if defined(__SSE4_1__) || defined(__AVX__) || defined(__SSSE3__) || \

defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \

(defined(_M_IX86_FP) && _M_IX86_FP >= 2)

# define PNG_INTEL_SSE_OPT 1

# else

# define PNG_INTEL_SSE_OPT 0

# endif

# else

# define PNG_INTEL_SSE_OPT 0

# endif

#endif

#if PNG_INTEL_SSE_OPT > 0

# ifndef PNG_INTEL_SSE_IMPLEMENTATION

# if defined(__SSE4_1__) || defined(__AVX__)

/* We are not actually using AVX, but checking for AVX is the best

way we can detect SSE4.1 and SSSE3 on MSVC.

*/

# define PNG_INTEL_SSE_IMPLEMENTATION 3

# elif defined(__SSSE3__)

# define PNG_INTEL_SSE_IMPLEMENTATION 2

# elif defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \

(defined(_M_IX86_FP) && _M_IX86_FP >= 2)

# define PNG_INTEL_SSE_IMPLEMENTATION 1

# else

# define PNG_INTEL_SSE_IMPLEMENTATION 0

# endif

# endif

# if PNG_INTEL_SSE_IMPLEMENTATION > 0

# define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_sse2

# endif

#else

# define PNG_INTEL_SSE_IMPLEMENTATION 0

#endif

#if PNG_MIPS_MSA_OPT > 0

# define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_msa

# ifndef PNG_MIPS_MSA_IMPLEMENTATION

# if defined(__mips_msa)

# if defined(__clang__)

# elif defined(__GNUC__)

# if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7)

# define PNG_MIPS_MSA_IMPLEMENTATION 2

# endif /* no GNUC support */

# endif /* __GNUC__ */

# else /* !defined __mips_msa */

# define PNG_MIPS_MSA_IMPLEMENTATION 2

# endif /* __mips_msa */

# endif /* !PNG_MIPS_MSA_IMPLEMENTATION */

# ifndef PNG_MIPS_MSA_IMPLEMENTATION

# define PNG_MIPS_MSA_IMPLEMENTATION 1

# endif

#endif /* PNG_MIPS_MSA_OPT > 0 */

#if PNG_POWERPC_VSX_OPT > 0

# define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_vsx

# define PNG_POWERPC_VSX_IMPLEMENTATION 1

#endif

/* Is this a build of a DLL where compilation of the object modules requires

* different preprocessor settings to those required for a simple library? If

* so PNG_BUILD_DLL must be set.

*

* If libpng is used inside a DLL but that DLL does not export the libpng APIs

* PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a

* static library of libpng then link the DLL against that.

*/

#ifndef PNG_BUILD_DLL

# ifdef DLL_EXPORT

/* This is set by libtool when files are compiled for a DLL; libtool

* always compiles twice, even on systems where it isn't necessary. Set

* PNG_BUILD_DLL in case it is necessary:

*/

# define PNG_BUILD_DLL

# else

# ifdef _WINDLL

/* This is set by the Microsoft Visual Studio IDE in projects that

* build a DLL. It can't easily be removed from those projects (it

* isn't visible in the Visual Studio UI) so it is a fairly reliable

* indication that PNG_IMPEXP needs to be set to the DLL export

* attributes.

*/

# define PNG_BUILD_DLL

# else

# ifdef __DLL__

/* This is set by the Borland C system when compiling for a DLL

* (as above.)

*/

# define PNG_BUILD_DLL

# else

/* Add additional compiler cases here. */

# endif

# endif

# endif

#endif /* Setting PNG_BUILD_DLL if required */

/* See pngconf.h for more details: the builder of the library may set this on

* the command line to the right thing for the specific compilation system or it

* may be automagically set above (at present we know of no system where it does

* need to be set on the command line.)

*

* PNG_IMPEXP must be set here when building the library to prevent pngconf.h

* setting it to the "import" setting for a DLL build.

*/

#ifndef PNG_IMPEXP

# ifdef PNG_BUILD_DLL

# define PNG_IMPEXP PNG_DLL_EXPORT

# else

/* Not building a DLL, or the DLL doesn't require specific export

* definitions.

*/

# define PNG_IMPEXP

# endif

#endif

/* No warnings for private or deprecated functions in the build: */

#ifndef PNG_DEPRECATED

# define PNG_DEPRECATED

#endif

#ifndef PNG_PRIVATE

# define PNG_PRIVATE

#endif

/* Symbol preprocessing support.

*

* To enable listing global, but internal, symbols the following macros should

* always be used to declare an extern data or function object in this file.

*/

#ifndef PNG_INTERNAL_DATA

# define PNG_INTERNAL_DATA(type, name, array) PNG_LINKAGE_DATA type name array

#endif

#ifndef PNG_INTERNAL_FUNCTION

# define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\

PNG_LINKAGE_FUNCTION PNG_FUNCTION(type, name, args, PNG_EMPTY attributes)

#endif

#ifndef PNG_INTERNAL_CALLBACK

# define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\

PNG_LINKAGE_CALLBACK PNG_FUNCTION(type, (PNGCBAPI name), args,\

PNG_EMPTY attributes)

#endif

/* If floating or fixed point APIs are disabled they may still be compiled

* internally. To handle this make sure they are declared as the appropriate

* internal extern function (otherwise the symbol prefixing stuff won't work and

* the functions will be used without definitions.)

*

* NOTE: although all the API functions are declared here they are not all

* actually built! Because the declarations are still made it is necessary to

* fake out types that they depend on.

*/

#ifndef PNG_FP_EXPORT

# ifndef PNG_FLOATING_POINT_SUPPORTED

# define PNG_FP_EXPORT(ordinal, type, name, args)\

PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);

# ifndef PNG_VERSION_INFO_ONLY

typedef struct png_incomplete png_double;

typedef png_double* png_doublep;

typedef const png_double* png_const_doublep;

typedef png_double** png_doublepp;

# endif

# endif

#endif

#ifndef PNG_FIXED_EXPORT

# ifndef PNG_FIXED_POINT_SUPPORTED

# define PNG_FIXED_EXPORT(ordinal, type, name, args)\

PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);

# endif

#endif

#include "png.h"

/* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */

#ifndef PNG_DLL_EXPORT

# define PNG_DLL_EXPORT

#endif

/* This is a global switch to set the compilation for an installed system

* (a release build). It can be set for testing debug builds to ensure that

* they will compile when the build type is switched to RC or STABLE, the

* default is just to use PNG_LIBPNG_BUILD_BASE_TYPE. Set this in CPPFLAGS

* with either:

*

* -DPNG_RELEASE_BUILD Turns on the release compile path

* -DPNG_RELEASE_BUILD=0 Turns it off

* or in your pngusr.h with

* #define PNG_RELEASE_BUILD=1 Turns on the release compile path

* #define PNG_RELEASE_BUILD=0 Turns it off

*/

#ifndef PNG_RELEASE_BUILD

# define PNG_RELEASE_BUILD (PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC)

#endif

/* SECURITY and SAFETY:

*

* libpng is built with support for internal limits on image dimensions and

* memory usage. These are documented in scripts/pnglibconf.dfa of the

* source and recorded in the machine generated header file pnglibconf.h.

*/

/* If you are running on a machine where you cannot allocate more

* than 64K of memory at once, uncomment this. While libpng will not

* normally need that much memory in a chunk (unless you load up a very

* large file), zlib needs to know how big of a chunk it can use, and

* libpng thus makes sure to check any memory allocation to verify it

* will fit into memory.

*

* zlib provides 'MAXSEG_64K' which, if defined, indicates the

* same limit and pngconf.h (already included) sets the limit

* if certain operating systems are detected.

*/

#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)

# define PNG_MAX_MALLOC_64K

#endif

#ifndef PNG_UNUSED

/* Unused formal parameter warnings are silenced using the following macro

* which is expected to have no bad effects on performance (optimizing

* compilers will probably remove it entirely). Note that if you replace

* it with something other than whitespace, you must include the terminating

* semicolon.

*/

# define PNG_UNUSED(param) (void)param;

#endif

/* Just a little check that someone hasn't tried to define something

* contradictory.

*/

#if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K)

# undef PNG_ZBUF_SIZE

# define PNG_ZBUF_SIZE 65536L

#endif

/* If warnings or errors are turned off the code is disabled or redirected here.

* From 1.5.4 functions have been added to allow very limited formatting of

* error and warning messages - this code will also be disabled here.

*/

#ifdef PNG_WARNINGS_SUPPORTED

# define PNG_WARNING_PARAMETERS(p) png_warning_parameters p;

#else

# define png_warning_parameter(p,number,string) ((void)0)

# define png_warning_parameter_unsigned(p,number,format,value) ((void)0)

# define png_warning_parameter_signed(p,number,format,value) ((void)0)

# define png_formatted_warning(pp,p,message) ((void)(pp))

# define PNG_WARNING_PARAMETERS(p)

#endif

#ifndef PNG_ERROR_TEXT_SUPPORTED

# define png_fixed_error(s1,s2) png_err(s1)

#endif

/* Some fixed point APIs are still required even if not exported because

* they get used by the corresponding floating point APIs. This magic

* deals with this:

*/

#ifdef PNG_FIXED_POINT_SUPPORTED

# define PNGFAPI PNGAPI

#else

# define PNGFAPI /* PRIVATE */

#endif

#ifndef PNG_VERSION_INFO_ONLY

/* Other defines specific to compilers can go here. Try to keep

* them inside an appropriate ifdef/endif pair for portability.

*/

/* C allows up-casts from (void*) to any pointer and (const void*) to any

* pointer to a const object. C++ regards this as a type error and requires an

* explicit, static, cast and provides the static_cast<> rune to ensure that

* const is not cast away.

*/

#ifdef __cplusplus

# define png_voidcast(type, value) static_cast<type>(value)

# define png_constcast(type, value) const_cast<type>(value)

# define png_aligncast(type, value) \

static_cast<type>(static_cast<void*>(value))

# define png_aligncastconst(type, value) \

static_cast<type>(static_cast<const void*>(value))

#else

# define png_voidcast(type, value) (value)

# ifdef _WIN64

# ifdef __GNUC__

typedef unsigned long long png_ptruint;

# else

typedef unsigned __int64 png_ptruint;

# endif

# else

typedef unsigned long png_ptruint;

# endif

# define png_constcast(type, value) ((type)(png_ptruint)(const void*)(value))

# define png_aligncast(type, value) ((void*)(value))

# define png_aligncastconst(type, value) ((const void*)(value))

#endif /* __cplusplus */

#if defined(PNG_FLOATING_POINT_SUPPORTED) ||\

defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)

/* png.c requires the following ANSI-C constants if the conversion of

* floating point to ASCII is implemented therein:

*

* DBL_DIG Maximum number of decimal digits (can be set to any constant)

* DBL_MIN Smallest normalized fp number (can be set to an arbitrary value)

* DBL_MAX Maximum floating point number (can be set to an arbitrary value)

*/

# include <float.h>

# if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \

defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)

/* We need to check that <math.h> hasn't already been included earlier

* as it seems it doesn't agree with <fp.h>, yet we should really use

* <fp.h> if possible.

*/

# if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)

# include <fp.h>

# endif

# else

# include <math.h>

# endif

# if defined(_AMIGA) && defined(__SASC) && defined(_M68881)

/* Amiga SAS/C: We must include builtin FPU functions when compiling using

* MATH=68881

*/

# include <m68881.h>

# endif

#endif

/* This provides the non-ANSI (far) memory allocation routines. */

#if defined(__TURBOC__) && defined(__MSDOS__)

# include <mem.h>

# include <alloc.h>

#endif

#if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \

defined(_WIN32) || defined(__WIN32__)

# include <windows.h> /* defines _WINDOWS_ macro */

#endif

#endif /* PNG_VERSION_INFO_ONLY */

/* Moved here around 1.5.0beta36 from pngconf.h */

/* Users may want to use these so they are not private. Any library

* functions that are passed far data must be model-independent.

*/

/* Memory model/platform independent fns */

#ifndef PNG_ABORT

# ifdef _WINDOWS_

# define PNG_ABORT() ExitProcess(0)

# else

# define PNG_ABORT() abort()

# endif

#endif

/* These macros may need to be architecture dependent. */

#define PNG_ALIGN_NONE 0 /* do not use data alignment */

#define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */

#ifdef offsetof

# define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */

#else

# define PNG_ALIGN_OFFSET -1 /* prevent the use of this */

#endif

#define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */

#ifndef PNG_ALIGN_TYPE

/* Default to using aligned access optimizations and requiring alignment to a

* multiple of the data type size. Override in a compiler specific fashion

* if necessary by inserting tests here:

*/

# define PNG_ALIGN_TYPE PNG_ALIGN_SIZE

#endif

#if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE

/* This is used because in some compiler implementations non-aligned

* structure members are supported, so the offsetof approach below fails.

* Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access

* is good for performance. Do not do this unless you have tested the result

* and understand it.

*/

# define png_alignof(type) (sizeof (type))

#else

# if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET

# define png_alignof(type) offsetof(struct{char c; type t;}, t)

# else

# if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS

# define png_alignof(type) (1)

# endif

/* Else leave png_alignof undefined to prevent use thereof */

# endif

#endif

/* This implicitly assumes alignment is always to a power of 2. */

#ifdef png_alignof

# define png_isaligned(ptr, type)\

(((type)((const char*)ptr-(const char*)0) & \

(type)(png_alignof(type)-1)) == 0)

#else

# define png_isaligned(ptr, type) 0

#endif

/* End of memory model/platform independent support */

/* End of 1.5.0beta36 move from pngconf.h */

/* CONSTANTS and UTILITY MACROS

* These are used internally by libpng and not exposed in the API

*/

/* Various modes of operation. Note that after an init, mode is set to

* zero automatically when the structure is created. Three of these

* are defined in png.h because they need to be visible to applications

* that call png_set_unknown_chunk().

*/

/* #define PNG_HAVE_IHDR 0x01U (defined in png.h) */

/* #define PNG_HAVE_PLTE 0x02U (defined in png.h) */

#define PNG_HAVE_IDAT 0x04U

/* #define PNG_AFTER_IDAT 0x08U (defined in png.h) */

#define PNG_HAVE_IEND 0x10U

/* 0x20U (unused) */

/* 0x40U (unused) */

/* 0x80U (unused) */

#define PNG_HAVE_CHUNK_HEADER 0x100U

#define PNG_WROTE_tIME 0x200U

#define PNG_WROTE_INFO_BEFORE_PLTE 0x400U

#define PNG_BACKGROUND_IS_GRAY 0x800U

#define PNG_HAVE_PNG_SIGNATURE 0x1000U

#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000U /* Have another chunk after IDAT */

/* 0x4000U (unused) */

#define PNG_IS_READ_STRUCT 0x8000U /* Else is a write struct */

/* Flags for the transformations the PNG library does on the image data */

#define PNG_BGR 0x0001U

#define PNG_INTERLACE 0x0002U

#define PNG_PACK 0x0004U

#define PNG_SHIFT 0x0008U

#define PNG_SWAP_BYTES 0x0010U

#define PNG_INVERT_MONO 0x0020U

#define PNG_QUANTIZE 0x0040U

#define PNG_COMPOSE 0x0080U /* Was PNG_BACKGROUND */

#define PNG_BACKGROUND_EXPAND 0x0100U

#define PNG_EXPAND_16 0x0200U /* Added to libpng 1.5.2 */

#define PNG_16_TO_8 0x0400U /* Becomes 'chop' in 1.5.4 */

#define PNG_RGBA 0x0800U

#define PNG_EXPAND 0x1000U

#define PNG_GAMMA 0x2000U

#define PNG_GRAY_TO_RGB 0x4000U

#define PNG_FILLER 0x8000U

#define PNG_PACKSWAP 0x10000U

#define PNG_SWAP_ALPHA 0x20000U

#define PNG_STRIP_ALPHA 0x40000U

#define PNG_INVERT_ALPHA 0x80000U

#define PNG_USER_TRANSFORM 0x100000U

#define PNG_RGB_TO_GRAY_ERR 0x200000U

#define PNG_RGB_TO_GRAY_WARN 0x400000U

#define PNG_RGB_TO_GRAY 0x600000U /* two bits, RGB_TO_GRAY_ERR|WARN */

#define PNG_ENCODE_ALPHA 0x800000U /* Added to libpng-1.5.4 */

#define PNG_ADD_ALPHA 0x1000000U /* Added to libpng-1.2.7 */

#define PNG_EXPAND_tRNS 0x2000000U /* Added to libpng-1.2.9 */

#define PNG_SCALE_16_TO_8 0x4000000U /* Added to libpng-1.5.4 */

/* 0x8000000U unused */

/* 0x10000000U unused */

/* 0x20000000U unused */

/* 0x40000000U unused */

/* Flags for png_create_struct */

#define PNG_STRUCT_PNG 0x0001U

#define PNG_STRUCT_INFO 0x0002U

/* Flags for the png_ptr->flags rather than declaring a byte for each one */

#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001U

#define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002U /* Added to libpng-1.6.0 */

/* 0x0004U unused */

#define PNG_FLAG_ZSTREAM_ENDED 0x0008U /* Added to libpng-1.6.0 */

/* 0x0010U unused */

/* 0x0020U unused */

#define PNG_FLAG_ROW_INIT 0x0040U

#define PNG_FLAG_FILLER_AFTER 0x0080U

#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100U

#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200U

#define PNG_FLAG_CRC_CRITICAL_USE 0x0400U

#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800U

#define PNG_FLAG_ASSUME_sRGB 0x1000U /* Added to libpng-1.5.4 */

#define PNG_FLAG_OPTIMIZE_ALPHA 0x2000U /* Added to libpng-1.5.4 */

#define PNG_FLAG_DETECT_UNINITIALIZED 0x4000U /* Added to libpng-1.5.4 */

/* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000U */

/* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000U */

#define PNG_FLAG_LIBRARY_MISMATCH 0x20000U

#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000U

#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000U

#define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000U /* Added to libpng-1.4.0 */

#define PNG_FLAG_APP_WARNINGS_WARN 0x200000U /* Added to libpng-1.6.0 */

#define PNG_FLAG_APP_ERRORS_WARN 0x400000U /* Added to libpng-1.6.0 */

/* 0x800000U unused */

/* 0x1000000U unused */

/* 0x2000000U unused */

/* 0x4000000U unused */

/* 0x8000000U unused */

/* 0x10000000U unused */

/* 0x20000000U unused */

/* 0x40000000U unused */

#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \

PNG_FLAG_CRC_ANCILLARY_NOWARN)

#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \

PNG_FLAG_CRC_CRITICAL_IGNORE)

#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \

PNG_FLAG_CRC_CRITICAL_MASK)

/* Save typing and make code easier to understand */

#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \

abs((int)((c1).green) - (int)((c2).green)) + \

abs((int)((c1).blue) - (int)((c2).blue)))

/* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255

* by dividing by 257 *with rounding*. This macro is exact for the given range.

* See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the

* macro were established by experiment (modifying the added value). The macro

* has a second variant that takes a value already scaled by 255 and divides by

* 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it

* only gives off-by-one errors and only for 0.5% (1 in 200) of the values.

*/

#define PNG_DIV65535(v24) (((v24) + 32895) >> 16)

#define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255)

/* Added to libpng-1.2.6 JB */

#define PNG_ROWBYTES(pixel_bits, width) \

((pixel_bits) >= 8 ? \

((size_t)(width) * (((size_t)(pixel_bits)) >> 3)) : \

(( ((size_t)(width) * ((size_t)(pixel_bits))) + 7) >> 3) )

/* This returns the number of trailing bits in the last byte of a row, 0 if the

* last byte is completely full of pixels. It is, in principle, (pixel_bits x

* width) % 8, but that would overflow for large 'width'. The second macro is

* the same except that it returns the number of unused bits in the last byte;

* (8-TRAILBITS), but 0 when TRAILBITS is 0.

*

* NOTE: these macros are intended to be self-evidently correct and never

* overflow on the assumption that pixel_bits is in the range 0..255. The

* arguments are evaluated only once and they can be signed (e.g. as a result of

* the integral promotions). The result of the expression always has type

* (png_uint_32), however the compiler always knows it is in the range 0..7.

*/

#define PNG_TRAILBITS(pixel_bits, width) \

(((pixel_bits) * ((width) % (png_uint_32)8)) % 8)

#define PNG_PADBITS(pixel_bits, width) \

((8 - PNG_TRAILBITS(pixel_bits, width)) % 8)

/* PNG_OUT_OF_RANGE returns true if value is outside the range

* ideal-delta..ideal+delta. Each argument is evaluated twice.

* "ideal" and "delta" should be constants, normally simple

* integers, "value" a variable. Added to libpng-1.2.6 JB

*/

#define PNG_OUT_OF_RANGE(value, ideal, delta) \

( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )

/* Conversions between fixed and floating point, only defined if

* required (to make sure the code doesn't accidentally use float

* when it is supposedly disabled.)

*/

#ifdef PNG_FLOATING_POINT_SUPPORTED

/* The floating point conversion can't overflow, though it can and

* does lose accuracy relative to the original fixed point value.

* In practice this doesn't matter because png_fixed_point only

* stores numbers with very low precision. The png_ptr and s

* arguments are unused by default but are there in case error

* checking becomes a requirement.

*/

#define png_float(png_ptr, fixed, s) (.00001 * (fixed))

/* The fixed point conversion performs range checking and evaluates

* its argument multiple times, so must be used with care. The

* range checking uses the PNG specification values for a signed

* 32-bit fixed point value except that the values are deliberately

* rounded-to-zero to an integral value - 21474 (21474.83 is roughly

* (2^31-1) * 100000). 's' is a string that describes the value being

* converted.

*

* NOTE: this macro will raise a png_error if the range check fails,

* therefore it is normally only appropriate to use this on values

* that come from API calls or other sources where an out of range

* error indicates a programming error, not a data error!

*

* NOTE: by default this is off - the macro is not used - because the

* function call saves a lot of code.

*/

#ifdef PNG_FIXED_POINT_MACRO_SUPPORTED

#define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\

((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0))

#endif

/* else the corresponding function is defined below, inside the scope of the

* cplusplus test.

*/

#endif

/* Constants for known chunk types. If you need to add a chunk, define the name

* here. For historical reasons these constants have the form png_<name>; i.e.

* the prefix is lower case. Please use decimal values as the parameters to

* match the ISO PNG specification and to avoid relying on the C locale

* interpretation of character values.

*

* Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values

* are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string

* to be generated if required.

*

* PNG_32b correctly produces a value shifted by up to 24 bits, even on

* architectures where (int) is only 16 bits.

*/

#define PNG_32b(b,s) ((png_uint_32)(b) << (s))

#define PNG_U32(b1,b2,b3,b4) \

(PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0))

/* Constants for known chunk types.

*

* MAINTAINERS: If you need to add a chunk, define the name here.

* For historical reasons these constants have the form png_<name>; i.e.

* the prefix is lower case. Please use decimal values as the parameters to

* match the ISO PNG specification and to avoid relying on the C locale

* interpretation of character values. Please keep the list sorted.

*

* Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk

* type. In fact the specification does not express chunk types this way,

* however using a 32-bit value means that the chunk type can be read from the

* stream using exactly the same code as used for a 32-bit unsigned value and

* can be examined far more efficiently (using one arithmetic compare).

*

* Prior to 1.5.6 the chunk type constants were expressed as C strings. The

* libpng API still uses strings for 'unknown' chunks and a macro,

* PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice

* that for portable code numeric values must still be used; the string "IHDR"

* is not portable and neither is PNG_U32('I', 'H', 'D', 'R').

*

* In 1.7.0 the definitions will be made public in png.h to avoid having to

* duplicate the same definitions in application code.

*/

#define png_IDAT PNG_U32( 73, 68, 65, 84)

#define png_IEND PNG_U32( 73, 69, 78, 68)

#define png_IHDR PNG_U32( 73, 72, 68, 82)

#define png_PLTE PNG_U32( 80, 76, 84, 69)

#define png_bKGD PNG_U32( 98, 75, 71, 68)

#define png_cHRM PNG_U32( 99, 72, 82, 77)

#define png_eXIf PNG_U32(101, 88, 73, 102) /* registered July 2017 */

#define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */

#define png_gAMA PNG_U32(103, 65, 77, 65)

#define png_gIFg PNG_U32(103, 73, 70, 103)

#define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */

#define png_gIFx PNG_U32(103, 73, 70, 120)

#define png_hIST PNG_U32(104, 73, 83, 84)

#define png_iCCP PNG_U32(105, 67, 67, 80)

#define png_iTXt PNG_U32(105, 84, 88, 116)

#define png_oFFs PNG_U32(111, 70, 70, 115)

#define png_pCAL PNG_U32(112, 67, 65, 76)

#define png_pHYs PNG_U32(112, 72, 89, 115)

#define png_sBIT PNG_U32(115, 66, 73, 84)

#define png_sCAL PNG_U32(115, 67, 65, 76)

#define png_sPLT PNG_U32(115, 80, 76, 84)

#define png_sRGB PNG_U32(115, 82, 71, 66)

#define png_sTER PNG_U32(115, 84, 69, 82)

#define png_tEXt PNG_U32(116, 69, 88, 116)

#define png_tIME PNG_U32(116, 73, 77, 69)

#define png_tRNS PNG_U32(116, 82, 78, 83)

#define png_zTXt PNG_U32(122, 84, 88, 116)

/* The following will work on (signed char*) strings, whereas the get_uint_32

* macro will fail on top-bit-set values because of the sign extension.

*/

#define PNG_CHUNK_FROM_STRING(s)\

PNG_U32(0xff & (s)[0], 0xff & (s)[1], 0xff & (s)[2], 0xff & (s)[3])

/* This uses (char), not (png_byte) to avoid warnings on systems where (char) is

* signed and the argument is a (char[]) This macro will fail miserably on

* systems where (char) is more than 8 bits.

*/

#define PNG_STRING_FROM_CHUNK(s,c)\

(void)(((char*)(s))[0]=(char)(((c)>>24) & 0xff), \

((char*)(s))[1]=(char)(((c)>>16) & 0xff),\

((char*)(s))[2]=(char)(((c)>>8) & 0xff), \

((char*)(s))[3]=(char)((c & 0xff)))

/* Do the same but terminate with a null character. */

#define PNG_CSTRING_FROM_CHUNK(s,c)\

(void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0)

/* Test on flag values as defined in the spec (section 5.4): */

#define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29))

#define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c))

#define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21))

#define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13))

#define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5))

/* Gamma values (new at libpng-1.5.4): */

#define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */

#define PNG_GAMMA_MAC_INVERSE 65909

#define PNG_GAMMA_sRGB_INVERSE 45455

/* Almost everything below is C specific; the #defines above can be used in

* non-C code (so long as it is C-preprocessed) the rest of this stuff cannot.

*/

#ifndef PNG_VERSION_INFO_ONLY

#include "pngstruct.h"

#include "pnginfo.h"

/* Validate the include paths - the include path used to generate pnglibconf.h

* must match that used in the build, or we must be using pnglibconf.h.prebuilt:

*/

#if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM

# error ZLIB_VERNUM != PNG_ZLIB_VERNUM \

"-I (include path) error: see the notes in pngpriv.h"

/* This means that when pnglibconf.h was built the copy of zlib.h that it

* used is not the same as the one being used here. Because the build of

* libpng makes decisions to use inflateInit2 and inflateReset2 based on the

* zlib version number and because this affects handling of certain broken

* PNG files the -I directives must match.

*

* The most likely explanation is that you passed a -I in CFLAGS. This will

* not work; all the preprocessor directives and in particular all the -I

* directives must be in CPPFLAGS.

*/

#endif

/* This is used for 16-bit gamma tables -- only the top level pointers are

* const; this could be changed:

*/

typedef const png_uint_16p * png_const_uint_16pp;

/* Added to libpng-1.5.7: sRGB conversion tables */

#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\

defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)

#ifdef PNG_SIMPLIFIED_READ_SUPPORTED

PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]);

/* Convert from an sRGB encoded value 0..255 to a 16-bit linear value,

* 0..65535. This table gives the closest 16-bit answers (no errors).

*/

#endif

PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]);

PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]);

#define PNG_sRGB_FROM_LINEAR(linear) \

((png_byte)(0xff & ((png_sRGB_base[(linear)>>15] \

+ ((((linear) & 0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8)))

/* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB

* encoded value with maximum error 0.646365. Note that the input is not a

* 16-bit value; it has been multiplied by 255! */

#endif /* SIMPLIFIED_READ/WRITE */

/* Inhibit C++ name-mangling for libpng functions but not for system calls. */

#ifdef __cplusplus

extern "C" {

#endif /* __cplusplus */

/* Internal functions; these are not exported from a DLL however because they

* are used within several of the C source files they have to be C extern.

*

* All of these functions must be declared with PNG_INTERNAL_FUNCTION.

*/

/* Zlib support */

#define PNG_UNEXPECTED_ZLIB_RETURN (-7)

PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret),

PNG_EMPTY);

/* Used by the zlib handling functions to ensure that z_stream::msg is always

* set before they return.

*/

#ifdef PNG_WRITE_SUPPORTED

PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr,

png_compression_bufferp *list),PNG_EMPTY);

/* Free the buffer list used by the compressed write code. */

#endif

#if defined(PNG_FLOATING_POINT_SUPPORTED) && \

!defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \

(defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \

defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \

defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \

(defined(PNG_sCAL_SUPPORTED) && \

defined(PNG_FLOATING_ARITHMETIC_SUPPORTED))

PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr,

double fp, png_const_charp text),PNG_EMPTY);

#endif

/* Check the user version string for compatibility, returns false if the version

* numbers aren't compatible.

*/

PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr,

png_const_charp user_png_ver),PNG_EMPTY);

/* Internal base allocator - no messages, NULL on failure to allocate. This