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#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.

 *

 * POSIX 1003.1 2.8.2 "POSIX Symbols."

 *

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

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

 */

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

#ifndef PNG_VERSION_INFO_ONLY

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

#  include 

#  include 

#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 

   /* 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 */

#  ifndef PNG_USER_DLLFNAME_POSTFIX

#    define PNG_USER_DLLFNAME_POSTFIX "Cb"

#  endif

#endif

/* Compile time options.

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

 * 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.

 */

    * 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

    */

#  ifdef __ARM_NEON__

#  else

#  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

#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

#        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

 */

#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

/* 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) extern type name array

#endif

#ifndef PNG_INTERNAL_FUNCTION

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

      extern PNG_FUNCTION(type, 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

 * 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_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

/* SECURITY and SAFETY:

 *

 * By default libpng is built without any internal limits on image size,

 * individual heap (png_malloc) allocations or the total amount of memory used.

 * If PNG_SAFE_LIMITS_SUPPORTED is defined, however, the limits below are used

 * (unless individually overridden).  These limits are believed to be fairly

 * safe, but builders of secure systems should verify the values against the

 * real system capabilities.

 */

#ifdef PNG_SAFE_LIMITS_SUPPORTED

   /* 'safe' limits */

#  ifndef PNG_USER_WIDTH_MAX

#     define PNG_USER_WIDTH_MAX 1000000

#  endif

#  ifndef PNG_USER_HEIGHT_MAX

#     define PNG_USER_HEIGHT_MAX 1000000

#  endif

#  ifndef PNG_USER_CHUNK_CACHE_MAX

#     define PNG_USER_CHUNK_CACHE_MAX 128

#  endif

#  ifndef PNG_USER_CHUNK_MALLOC_MAX

#     define PNG_USER_CHUNK_MALLOC_MAX 8000000

#  endif

#else

   /* values for no limits */

#  ifndef PNG_USER_WIDTH_MAX

#     define PNG_USER_WIDTH_MAX 0x7fffffff

#  endif

#  ifndef PNG_USER_HEIGHT_MAX

#ifndef PNG_UNUSED

#endif

 */

#ifdef PNG_WARNINGS_SUPPORTED

#  define png_warning(s1,s2) ((void)(s1))

#  define png_chunk_warning(s1,s2) ((void)(s1))

#  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)

 * const is not cast away.

 */

#ifdef __cplusplus

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

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

#  define png_aligncast(type, value) \

#  define png_aligncastconst(type, value) \

   static_cast(static_cast(value))

#else

#  define png_voidcast(type, value) (value)

#  define png_constcast(type, value) ((type)(value))

#ifndef PNG_VERSION_INFO_ONLY

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

    defined(_WIN32) || defined(__WIN32__)

#  include   /* defines _WINDOWS_ macro */

#endif

#endif /* PNG_VERSION_INFO_ONLY */

#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

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

    * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access

    * and understand it.

#else

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

#        define png_alignof(type) (1)

#     endif

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

#endif

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

#ifdef png_alignof

#  define png_isaligned(ptr, type)\

#endif

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

#define PNG_BACKGROUND_IS_GRAY     0x800

#define PNG_HAVE_PNG_SIGNATURE    0x1000

#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)))

 * cplusplus test.

 */

#endif

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

 * 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

 *

 * 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_; 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.

 *

 * 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_IHDR PNG_U32( 73,  72,  68,  82)

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

#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)

/* 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), ((char*)(s))[1]=(char)((c)>>16),\

   ((char*)(s))[2]=(char)((c)>>8), ((char*)(s))[3]=(char)((c)))

/* 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 directories 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)((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 /* PNG_SIMPLIFIED_READ/WRITE */

 *

/* 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

 * does, however, call the application provided allocator and that could call

 * png_error (although that would be a bug in the application implementation.)

 */

PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr,

   png_alloc_size_t size),PNG_ALLOCATED);

#if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\

   defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED)

/* Internal array allocator, outputs no error or warning messages on failure,

 * just returns NULL.  

 */

PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr,

   int nelements, size_t element_size),PNG_ALLOCATED);

/* The same but an existing array is extended by add_elements.  This function

 * also memsets the new elements to 0 and copies the old elements.  The old

 * array is not freed or altered.

 */

PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr,

   png_const_voidp array, int old_elements, int add_elements,

   size_t element_size),PNG_ALLOCATED);

#endif /* text, sPLT or unknown chunks */

/* Magic to create a struct when there is no struct to call the user supplied

 * memory allocators.  Because error handling has not been set up the memory

 * handlers can't safely call png_error, but this is an obscure and undocumented

 * restriction so libpng has to assume that the 'free' handler, at least, might

 * call png_error.

 */

    png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn,

    png_bytep data, png_size_t length),PNG_EMPTY);

#ifdef PNG_WRITE_FLUSH_SUPPORTED

   PNG_EMPTY);

    png_const_bytep data, png_size_t length),PNG_EMPTY);

/* Read the CRC from the file and compare it to the libpng calculated CRC */

PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY);

/* Calculate the CRC over a section of data.  Note that we are only

   png_const_bytep row_data, png_alloc_size_t row_data_length, int flush),

   PNG_EMPTY);

#ifdef PNG_WRITE_zTXt_SUPPORTED

#endif

#ifdef PNG_WRITE_iTXt_SUPPORTED

PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr,

    int compression, png_const_charp key, png_const_charp lang,

    png_const_charp lang_key, png_const_charp text),PNG_EMPTY);

#endif

#ifdef PNG_TEXT_SUPPORTED  /* Added at version 1.0.14 and 1.2.4 */

PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr,

    png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY);

#endif

#ifdef PNG_WRITE_oFFs_SUPPORTED

PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr,

    png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY);

#endif

#ifdef PNG_WRITE_pCAL_SUPPORTED

PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr,

    png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,

    png_const_charp units, png_charpp params),PNG_EMPTY);

#endif

#ifdef PNG_WRITE_pHYs_SUPPORTED

PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr,

    png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,

#endif

    int unit, png_const_charp width, png_const_charp height),PNG_EMPTY);

PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr),

 * array of png_ptr->width pixels.  If the image is not interlaced or this

 * is the final pass this just does a memcpy, otherwise the "display" flag

 * is used to determine whether to copy pixels that are not in the current pass.

 *

 * Because 'png_do_read_interlace' (below) replicates pixels this allows this

 * function to achieve the documented 'blocky' appearance during interlaced read

 * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row'

 * are not changed if they are not in the current pass, when display is 0.

 *

 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless.

 *

 * The API always reads from the png_struct row buffer and always assumes that

 * it is full width (png_do_read_interlace has already been called.)

 * This function is only ever used to write to row buffers provided by the