png.c File Reference

#include "pngpriv.h"

Go to the source code of this file.

Macros
#define	GCC_STRICT_OVERFLOW   0
#define	APPEND_STRING(string)
#define	APPEND_NUMBER(format, value)
#define	APPEND(ch)
#define	PNG_MD5(a, b, c, d)
#define	PNG_ICC_CHECKSUM(adler, crc, md5, intent, broke, date, length, fname)
#define	png_gt(a, b)
#define	png_fp_add(state, flags)
#define	png_fp_set(state, value)

Functions
void PNGAPI	png_set_sig_bytes (png_structrp png_ptr, int num_bytes)
int PNGAPI	png_sig_cmp (png_const_bytep sig, size_t start, size_t num_to_check)
	PNG_FUNCTION (voidpf, png_zalloc,(voidpf png_ptr, uInt items, uInt size), PNG_ALLOCATED)
void	png_zfree (voidpf png_ptr, voidpf ptr)
void	png_reset_crc (png_structrp png_ptr)
void	png_calculate_crc (png_structrp png_ptr, png_const_bytep ptr, size_t length)
int	png_user_version_check (png_structrp png_ptr, png_const_charp user_png_ver)
	PNG_FUNCTION (png_structp, png_create_png_struct,(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn), PNG_ALLOCATED)
	PNG_FUNCTION (png_infop, PNGAPI png_create_info_struct,(png_const_structrp png_ptr), PNG_ALLOCATED)
void PNGAPI	png_destroy_info_struct (png_const_structrp png_ptr, png_infopp info_ptr_ptr)
	PNG_FUNCTION (void, PNGAPI png_info_init_3,(png_infopp ptr_ptr, size_t png_info_struct_size), PNG_DEPRECATED)
void PNGAPI	png_data_freer (png_const_structrp png_ptr, png_inforp info_ptr, int freer, png_uint_32 mask)
void PNGAPI	png_free_data (png_const_structrp png_ptr, png_inforp info_ptr, png_uint_32 mask, int num)
png_voidp PNGAPI	png_get_io_ptr (png_const_structrp png_ptr)
void PNGAPI	png_init_io (png_structrp png_ptr, png_FILE_p fp)
void PNGAPI	png_save_int_32 (png_bytep buf, png_int_32 i)
int PNGAPI	png_convert_to_rfc1123_buffer (char out[29], png_const_timep ptime)
png_const_charp PNGAPI	png_convert_to_rfc1123 (png_structrp png_ptr, png_const_timep ptime)
png_const_charp PNGAPI	png_get_copyright (png_const_structrp png_ptr)
png_const_charp PNGAPI	png_get_libpng_ver (png_const_structrp png_ptr)
png_const_charp PNGAPI	png_get_header_ver (png_const_structrp png_ptr)
png_const_charp PNGAPI	png_get_header_version (png_const_structrp png_ptr)
int PNGAPI	png_handle_as_unknown (png_const_structrp png_ptr, png_const_bytep chunk_name)
int	png_chunk_unknown_handling (png_const_structrp png_ptr, png_uint_32 chunk_name)
int PNGAPI	png_reset_zstream (png_structrp png_ptr)
png_uint_32 PNGAPI	png_access_version_number (void)
void	png_zstream_error (png_structrp png_ptr, int ret)
static int	png_colorspace_check_gamma (png_const_structrp png_ptr, png_colorspacerp colorspace, png_fixed_point gAMA, int from)
void	png_colorspace_set_gamma (png_const_structrp png_ptr, png_colorspacerp colorspace, png_fixed_point gAMA)
void	png_colorspace_sync_info (png_const_structrp png_ptr, png_inforp info_ptr)
void	png_colorspace_sync (png_const_structrp png_ptr, png_inforp info_ptr)
static int	png_xy_from_XYZ (png_xy *xy, const png_XYZ *XYZ)
static int	png_XYZ_from_xy (png_XYZ *XYZ, const png_xy *xy)
static int	png_XYZ_normalize (png_XYZ *XYZ)
static int	png_colorspace_endpoints_match (const png_xy *xy1, const png_xy *xy2, int delta)
static int	png_colorspace_check_xy (png_XYZ *XYZ, const png_xy *xy)
static int	png_colorspace_check_XYZ (png_xy *xy, png_XYZ *XYZ)
static int	png_colorspace_set_xy_and_XYZ (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy, const png_XYZ *XYZ, int preferred)
int	png_colorspace_set_chromaticities (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy, int preferred)
int	png_colorspace_set_endpoints (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ_in, int preferred)
static char	png_icc_tag_char (png_uint_32 byte)
static void	png_icc_tag_name (char *name, png_uint_32 tag)
static int	is_ICC_signature_char (png_alloc_size_t it)
static int	is_ICC_signature (png_alloc_size_t it)
static int	png_icc_profile_error (png_const_structrp png_ptr, png_colorspacerp colorspace, png_const_charp name, png_alloc_size_t value, png_const_charp reason)
int	png_colorspace_set_sRGB (png_const_structrp png_ptr, png_colorspacerp colorspace, int intent)
static int	icc_check_length (png_const_structrp png_ptr, png_colorspacerp colorspace, png_const_charp name, png_uint_32 profile_length)
int	png_icc_check_length (png_const_structrp png_ptr, png_colorspacerp colorspace, png_const_charp name, png_uint_32 profile_length)
int	png_icc_check_header (png_const_structrp png_ptr, png_colorspacerp colorspace, png_const_charp name, png_uint_32 profile_length, png_const_bytep profile, int color_type)
int	png_icc_check_tag_table (png_const_structrp png_ptr, png_colorspacerp colorspace, png_const_charp name, png_uint_32 profile_length, png_const_bytep profile)
static int	png_compare_ICC_profile_with_sRGB (png_const_structrp png_ptr, png_const_bytep profile, uLong adler)
void	png_icc_set_sRGB (png_const_structrp png_ptr, png_colorspacerp colorspace, png_const_bytep profile, uLong adler)
int	png_colorspace_set_ICC (png_const_structrp png_ptr, png_colorspacerp colorspace, png_const_charp name, png_uint_32 profile_length, png_const_bytep profile, int color_type)
void	png_colorspace_set_rgb_coefficients (png_structrp png_ptr)
void	png_check_IHDR (png_const_structrp png_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, int interlace_type, int compression_type, int filter_type)
int	png_check_fp_number (png_const_charp string, size_t size, int *statep, png_size_tp whereami)
int	png_check_fp_string (png_const_charp string, size_t size)
static double	png_pow10 (int power)
void	png_ascii_from_fp (png_const_structrp png_ptr, png_charp ascii, size_t size, double fp, unsigned int precision)
void	png_ascii_from_fixed (png_const_structrp png_ptr, png_charp ascii, size_t size, png_fixed_point fp)
png_fixed_point	png_fixed (png_const_structrp png_ptr, double fp, png_const_charp text)
int	png_muldiv (png_fixed_point_p res, png_fixed_point a, png_int_32 times, png_int_32 divisor)
png_fixed_point	png_muldiv_warn (png_const_structrp png_ptr, png_fixed_point a, png_int_32 times, png_int_32 divisor)
png_fixed_point	png_reciprocal (png_fixed_point a)
int	png_gamma_significant (png_fixed_point gamma_val)
static png_fixed_point	png_product2 (png_fixed_point a, png_fixed_point b)
png_fixed_point	png_reciprocal2 (png_fixed_point a, png_fixed_point b)
png_byte	png_gamma_8bit_correct (unsigned int value, png_fixed_point gamma_val)
png_uint_16	png_gamma_16bit_correct (unsigned int value, png_fixed_point gamma_val)
png_uint_16	png_gamma_correct (png_structrp png_ptr, unsigned int value, png_fixed_point gamma_val)
static void	png_build_16bit_table (png_structrp png_ptr, png_uint_16pp *ptable, unsigned int shift, png_fixed_point gamma_val)
static void	png_build_16to8_table (png_structrp png_ptr, png_uint_16pp *ptable, unsigned int shift, png_fixed_point gamma_val)
static void	png_build_8bit_table (png_structrp png_ptr, png_bytepp ptable, png_fixed_point gamma_val)
void	png_destroy_gamma_table (png_structrp png_ptr)
void	png_build_gamma_table (png_structrp png_ptr, int bit_depth)

Variables
static const png_xy	sRGB_xy
static const png_byte	D50_nCIEXYZ [12]
struct {
png_uint_32   adler
png_uint_32   crc
png_uint_32   length
png_uint_32   md5 [4]
png_byte   have_md5
png_byte   is_broken
png_uint_16   intent
}	png_sRGB_checks []

Macro Definition Documentation

APPEND

#define APPEND

(

ch

)

Value:

if (pos < 28) out[pos++] = (ch)

APPEND_NUMBER

#define APPEND_NUMBER	(		format,
			value )

Value:

APPEND_STRING(PNG_FORMAT_NUMBER(number_buf, format, (value)))

APPEND_STRING

#define APPEND_STRING

(

string

)

Value:

pos = png_safecat(out, 29, pos, (string))

GCC_STRICT_OVERFLOW

#define GCC_STRICT_OVERFLOW   0

png_fp_add

#define png_fp_add	(		state,
			flags )

Value:

((state) |= (flags))

png_fp_set

#define png_fp_set	(		state,
			value )

Value:

((state) = (value) | ((state) & PNG_FP_STICKY))

png_gt

#define png_gt	(		a,
			b )

Value:

((a) > (b))

PNG_ICC_CHECKSUM

#define PNG_ICC_CHECKSUM	(		adler,
			crc,
			md5,
			intent,
			broke,
			date,
			length,
			fname )

Value:

{ adler, crc, length, md5, broke, intent },

PNG_MD5

#define PNG_MD5	(		a,
			b,
			c,
			d )

Value:

{ a, b, c, d }, (a!=0)||(b!=0)||(c!=0)||(d!=0)

Function Documentation

icc_check_length()

int icc_check_length ( png_const_structrp png_ptr, png_colorspacerp colorspace, png_const_charp name, png_uint_32 profile_length )

static

is_ICC_signature()

int is_ICC_signature ( png_alloc_size_t it )

static

is_ICC_signature_char()

int is_ICC_signature_char ( png_alloc_size_t it )

static

png_access_version_number()

png_uint_32 PNGAPI png_access_version_number

(

void

)

png_ascii_from_fixed()

void png_ascii_from_fixed	(	png_const_structrp	png_ptr,
		png_charp	ascii,
		size_t	size,
		png_fixed_point	fp )

png_ascii_from_fp()

void png_ascii_from_fp	(	png_const_structrp	png_ptr,
		png_charp	ascii,
		size_t	size,
		double	fp,
		unsigned int	precision )

png_build_16bit_table()

void png_build_16bit_table ( png_structrp png_ptr, png_uint_16pp * ptable, unsigned int shift, png_fixed_point gamma_val )

static

png_build_16to8_table()

void png_build_16to8_table ( png_structrp png_ptr, png_uint_16pp * ptable, unsigned int shift, png_fixed_point gamma_val )

static

png_build_8bit_table()

void png_build_8bit_table ( png_structrp png_ptr, png_bytepp ptable, png_fixed_point gamma_val )

static

png_build_gamma_table()

void png_build_gamma_table	(	png_structrp	png_ptr,
		int	bit_depth )

png_calculate_crc()

void png_calculate_crc	(	png_structrp	png_ptr,
		png_const_bytep	ptr,
		size_t	length )

png_check_fp_number()

int png_check_fp_number	(	png_const_charp	string,
		size_t	size,
		int *	statep,
		png_size_tp	whereami )

png_check_fp_string()

int png_check_fp_string	(	png_const_charp	string,
		size_t	size )

png_check_IHDR()

void png_check_IHDR	(	png_const_structrp	png_ptr,
		png_uint_32	width,
		png_uint_32	height,
		int	bit_depth,
		int	color_type,
		int	interlace_type,
		int	compression_type,
		int	filter_type )

png_chunk_unknown_handling()

int png_chunk_unknown_handling	(	png_const_structrp	png_ptr,
		png_uint_32	chunk_name )

png_colorspace_check_gamma()

int png_colorspace_check_gamma ( png_const_structrp png_ptr, png_colorspacerp colorspace, png_fixed_point gAMA, int from )

static

png_colorspace_check_xy()

int png_colorspace_check_xy ( png_XYZ * XYZ, const png_xy * xy )

static

png_colorspace_check_XYZ()

int png_colorspace_check_XYZ ( png_xy * xy, png_XYZ * XYZ )

static

png_colorspace_endpoints_match()

int png_colorspace_endpoints_match ( const png_xy * xy1, const png_xy * xy2, int delta )

static

png_colorspace_set_chromaticities()

int png_colorspace_set_chromaticities	(	png_const_structrp	png_ptr,
		png_colorspacerp	colorspace,
		const png_xy *	xy,
		int	preferred )

png_colorspace_set_endpoints()

int png_colorspace_set_endpoints	(	png_const_structrp	png_ptr,
		png_colorspacerp	colorspace,
		const png_XYZ *	XYZ_in,
		int	preferred )

png_colorspace_set_gamma()

void png_colorspace_set_gamma	(	png_const_structrp	png_ptr,
		png_colorspacerp	colorspace,
		png_fixed_point	gAMA )

png_colorspace_set_ICC()

int png_colorspace_set_ICC	(	png_const_structrp	png_ptr,
		png_colorspacerp	colorspace,
		png_const_charp	name,
		png_uint_32	profile_length,
		png_const_bytep	profile,
		int	color_type )

png_colorspace_set_rgb_coefficients()

void png_colorspace_set_rgb_coefficients

(

png_structrp

png_ptr

)

png_colorspace_set_sRGB()

int png_colorspace_set_sRGB	(	png_const_structrp	png_ptr,
		png_colorspacerp	colorspace,
		int	intent )

png_colorspace_set_xy_and_XYZ()

int png_colorspace_set_xy_and_XYZ ( png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy * xy, const png_XYZ * XYZ, int preferred )

static

png_colorspace_sync()

void png_colorspace_sync	(	png_const_structrp	png_ptr,
		png_inforp	info_ptr )

png_colorspace_sync_info()

void png_colorspace_sync_info	(	png_const_structrp	png_ptr,
		png_inforp	info_ptr )

png_compare_ICC_profile_with_sRGB()

int png_compare_ICC_profile_with_sRGB ( png_const_structrp png_ptr, png_const_bytep profile, uLong adler )

static

png_convert_to_rfc1123()

png_const_charp PNGAPI png_convert_to_rfc1123	(	png_structrp	png_ptr,
		png_const_timep	ptime )

png_convert_to_rfc1123_buffer()

int PNGAPI png_convert_to_rfc1123_buffer	(	char	out[29],
		png_const_timep	ptime )

png_data_freer()

void PNGAPI png_data_freer	(	png_const_structrp	png_ptr,
		png_inforp	info_ptr,
		int	freer,
		png_uint_32	mask )

png_destroy_gamma_table()

void png_destroy_gamma_table

(

png_structrp

png_ptr

)

png_destroy_info_struct()

void PNGAPI png_destroy_info_struct	(	png_const_structrp	png_ptr,
		png_infopp	info_ptr_ptr )

png_fixed()

png_fixed_point png_fixed	(	png_const_structrp	png_ptr,
		double	fp,
		png_const_charp	text )

png_free_data()

void PNGAPI png_free_data	(	png_const_structrp	png_ptr,
		png_inforp	info_ptr,
		png_uint_32	mask,
		int	num )

PNG_FUNCTION() [1/4]

PNG_FUNCTION	(	png_infop	,
		PNGAPI	png_create_info_struct,
		(png_const_structrp png_ptr)	,
		PNG_ALLOCATED	)

PNG_FUNCTION() [2/4]

PNG_FUNCTION	(	png_structp	,
		png_create_png_struct	,
		(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn)	,
		PNG_ALLOCATED	)

PNG_FUNCTION() [3/4]

PNG_FUNCTION	(	void	,
		PNGAPI	png_info_init_3,
		(png_infopp ptr_ptr, size_t png_info_struct_size)	,
		PNG_DEPRECATED	)

PNG_FUNCTION() [4/4]

PNG_FUNCTION	(	voidpf	,
		png_zalloc	,
		(voidpf png_ptr, uInt items, uInt size)	,
		PNG_ALLOCATED	)

png_gamma_16bit_correct()

png_uint_16 png_gamma_16bit_correct	(	unsigned int	value,
		png_fixed_point	gamma_val )

png_gamma_8bit_correct()

png_byte png_gamma_8bit_correct	(	unsigned int	value,
		png_fixed_point	gamma_val )

png_gamma_correct()

png_uint_16 png_gamma_correct	(	png_structrp	png_ptr,
		unsigned int	value,
		png_fixed_point	gamma_val )

png_gamma_significant()

int png_gamma_significant

(

png_fixed_point

gamma_val

)

png_get_copyright()

png_const_charp PNGAPI png_get_copyright

(

png_const_structrp

png_ptr

)

png_get_header_ver()

png_const_charp PNGAPI png_get_header_ver

(

png_const_structrp

png_ptr

)

png_get_header_version()

png_const_charp PNGAPI png_get_header_version

(

png_const_structrp

png_ptr

)

png_get_io_ptr()

png_voidp PNGAPI png_get_io_ptr

(

png_const_structrp

png_ptr

)

png_get_libpng_ver()

png_const_charp PNGAPI png_get_libpng_ver

(

png_const_structrp

png_ptr

)

png_handle_as_unknown()

int PNGAPI png_handle_as_unknown	(	png_const_structrp	png_ptr,
		png_const_bytep	chunk_name )

png_icc_check_header()

int png_icc_check_header	(	png_const_structrp	png_ptr,
		png_colorspacerp	colorspace,
		png_const_charp	name,
		png_uint_32	profile_length,
		png_const_bytep	profile,
		int	color_type )

png_icc_check_length()

int png_icc_check_length	(	png_const_structrp	png_ptr,
		png_colorspacerp	colorspace,
		png_const_charp	name,
		png_uint_32	profile_length )

png_icc_check_tag_table()

int png_icc_check_tag_table	(	png_const_structrp	png_ptr,
		png_colorspacerp	colorspace,
		png_const_charp	name,
		png_uint_32	profile_length,
		png_const_bytep	profile )

png_icc_profile_error()

int png_icc_profile_error ( png_const_structrp png_ptr, png_colorspacerp colorspace, png_const_charp name, png_alloc_size_t value, png_const_charp reason )

static

png_icc_set_sRGB()

void png_icc_set_sRGB	(	png_const_structrp	png_ptr,
		png_colorspacerp	colorspace,
		png_const_bytep	profile,
		uLong	adler )

png_icc_tag_char()

char png_icc_tag_char ( png_uint_32 byte )

static

png_icc_tag_name()

void png_icc_tag_name ( char * name, png_uint_32 tag )

static

png_init_io()

void PNGAPI png_init_io	(	png_structrp	png_ptr,
		png_FILE_p	fp )

png_muldiv()

int png_muldiv	(	png_fixed_point_p	res,
		png_fixed_point	a,
		png_int_32	times,
		png_int_32	divisor )

png_muldiv_warn()

png_fixed_point png_muldiv_warn	(	png_const_structrp	png_ptr,
		png_fixed_point	a,
		png_int_32	times,
		png_int_32	divisor )

png_pow10()

double png_pow10 ( int power )

static

png_product2()

png_fixed_point png_product2 ( png_fixed_point a, png_fixed_point b )

static

png_reciprocal()

png_fixed_point png_reciprocal

(

png_fixed_point

a

)

png_reciprocal2()

png_fixed_point png_reciprocal2	(	png_fixed_point	a,
		png_fixed_point	b )

png_reset_crc()

void png_reset_crc

(

png_structrp

png_ptr

)

png_reset_zstream()

int PNGAPI png_reset_zstream

(

png_structrp

png_ptr

)

png_save_int_32()

void PNGAPI png_save_int_32	(	png_bytep	buf,
		png_int_32	i )

png_set_sig_bytes()

void PNGAPI png_set_sig_bytes	(	png_structrp	png_ptr,
		int	num_bytes )

png_sig_cmp()

int PNGAPI png_sig_cmp	(	png_const_bytep	sig,
		size_t	start,
		size_t	num_to_check )

png_user_version_check()

int png_user_version_check	(	png_structrp	png_ptr,
		png_const_charp	user_png_ver )

png_xy_from_XYZ()

int png_xy_from_XYZ ( png_xy * xy, const png_XYZ * XYZ )

static

png_XYZ_from_xy()

int png_XYZ_from_xy ( png_XYZ * XYZ, const png_xy * xy )

static

png_XYZ_normalize()

int png_XYZ_normalize ( png_XYZ * XYZ )

static

png_zfree()

void png_zfree	(	voidpf	png_ptr,
		voidpf	ptr )

png_zstream_error()

void png_zstream_error	(	png_structrp	png_ptr,
		int	ret )

Variable Documentation

adler

png_uint_32 adler

crc

png_uint_32 crc

D50_nCIEXYZ

const png_byte D50_nCIEXYZ[12]

static

Initial value:

                               =
{ 0x00, 0x00, 0xf6, 0xd6, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0xd3, 0x2d }

have_md5

png_byte have_md5

intent

png_uint_16 intent

is_broken

png_byte is_broken

length

png_uint_32 length

md5

png_uint_32 md5[4]

[struct]

const struct { ... } png_sRGB_checks[]

sRGB_xy

const png_xy sRGB_xy

static

Initial value:

                            = 
{
   
    64000, 33000,
    30000, 60000,
    15000,  6000,
    31270, 32900
}