#include <string.h>
#include <math.h>
#include "allheaders.h"

Макросы
#define	DEBUG_IHDR 0

Функции
l_int32	readHeaderJp2k (const char filename, l_int32 pw, l_int32 ph, l_int32 pbps, l_int32 *pspp)

l_int32	freadHeaderJp2k (FILE fp, l_int32 pw, l_int32 ph, l_int32 pbps, l_int32 *pspp)

l_int32	readHeaderMemJp2k (const l_uint8 data, size_t size, l_int32 pw, l_int32 ph, l_int32 pbps, l_int32 *pspp)

l_int32	fgetJp2kResolution (FILE fp, l_int32 pxres, l_int32 *pyres)

Переменные
static const l_int32	MAX_JP2K_WIDTH = 100000

static const l_int32	MAX_JP2K_HEIGHT = 100000

Макросы

◆ DEBUG_IHDR

#define DEBUG_IHDR 0

Функции

◆ fgetJp2kResolution()

l_int32 fgetJp2kResolution	(	FILE *	fp,
		l_int32 *	pxres,
		l_int32 *	pyres
	)

◆ freadHeaderJp2k()

l_int32 freadHeaderJp2k	(	FILE *	fp,
		l_int32 *	pw,
		l_int32 *	ph,
		l_int32 *	pbps,
		l_int32 *	pspp
	)

freadHeaderJp2k()

Input:  stream opened for read
        &w (<optional return>)
        &h (<optional return>)
        &bps (<optional return>, bits/sample)
        &spp (<optional return>, samples/pixel)
Return: 0 if OK, 1 on error

◆ readHeaderJp2k()

l_int32 readHeaderJp2k	(	const char *	filename,
		l_int32 *	pw,
		l_int32 *	ph,
		l_int32 *	pbps,
		l_int32 *	pspp
	)

readHeaderJp2k()

Input:  filename
        &w (<optional return>)
        &h (<optional return>)
        &bps (<optional return>, bits/sample)
        &spp (<optional return>, samples/pixel)
Return: 0 if OK, 1 on error

◆ readHeaderMemJp2k()

l_int32 readHeaderMemJp2k	(	const l_uint8 *	data,
		size_t	size,
		l_int32 *	pw,
		l_int32 *	ph,
		l_int32 *	pbps,
		l_int32 *	pspp
	)

readHeaderMemJp2k()

Input:  data
        size (at least 80)
        &w (<optional return>)
        &h (<optional return>)
        &bps (<optional return>, bits/sample)
        &spp (<optional return>, samples/pixel)
Return: 0 if OK, 1 on error

Notes: (1) The ISO/IEC reference for jpeg2000 is http://www.jpeg.org/public/15444-1annexi.pdf and the file format syntax begins at page 127. (2) The Image Header Box begins with 'ihdr' = 0x69686472 in big-endian order. This typically, but not always, starts byte 44, with the big-endian data fields beginning at byte 48: h: 4 bytes w: 4 bytes spp: 2 bytes bps: 1 byte (contains bps - 1)

Переменные

◆ MAX_JP2K_HEIGHT

const l_int32 MAX_JP2K_HEIGHT = 100000

static

◆ MAX_JP2K_WIDTH

const l_int32 MAX_JP2K_WIDTH = 100000

static