jpcunpack.c File Reference

Unpack a data field that was packed with JPEG2000. More...

#include <stdio.h>
#include <stdlib.h>
#include "grib2_int.h"

Go to the source code of this file.

Functions
int	g2c_jpcunpackd (unsigned char *cpack, size_t len, int *idrstmpl, size_t ndpts, double *fld)
	Unpack JPEG2000 compressed data into an array of doubles, using info from the GRIB2 Data Representation Template 5.40 or 5.40000. More...
int	g2c_jpcunpackf (unsigned char *cpack, size_t len, int *idrstmpl, size_t ndpts, float *fld)
	Unpack JPEG2000 compressed data into an array of floats, using info from the GRIB2 Data Representation Template 5.40 or 5.40000. More...
g2int	jpcunpack (unsigned char *cpack, g2int len, g2int *idrstmpl, g2int ndpts, float *fld)
	Unpack JPEG2000 compressed data into an array of floats, using info from the GRIB2 Data Representation Template 5.40 or 5.40000. More...
static int	jpcunpack_int (unsigned char *cpack, g2int len, g2int *idrstmpl, g2int ndpts, void *fld, int fld_is_double, int verbose)
	This internal function will unpack JPEG2000 compressed data into an array of floats or doubles, using info from the GRIB2 Data Representation Template 5.40 or 5.40000. More...

Detailed Description

Unpack a data field that was packed with JPEG2000.

stream

Author

Stephem Gilbert

Date

2003-08-27

Definition in file jpcunpack.c.

Function Documentation

g2c_jpcunpackd()

int g2c_jpcunpackd	(	unsigned char *	cpack,
		size_t	len,
		int *	idrstmpl,
		size_t	ndpts,
		double *	fld
	)

Unpack JPEG2000 compressed data into an array of doubles, using info from the GRIB2 Data Representation Template 5.40 or 5.40000.

This function is the V2 API version of jpcunpack() for doubles.

Parameters

cpack	The packed data.
len	The length of the packed data.
idrstmpl	Pointer to array of values for Data Representation Template 5.40 or 5.40000.
ndpts	The number of data values to unpack.
fld	A pointer that gets the unpacked data values as an array of double.

Returns

• G2C_NOERROR No error.
• G2C_ENOMEM Out of memory.

Author

Ed Hartnett

Date

2022-08-12

Definition at line 200 of file jpcunpack.c.

References G2C_JPEG_DRS_TEMPLATE_LEN, jpcunpack_int(), and LOG.

g2c_jpcunpackf()

int g2c_jpcunpackf	(	unsigned char *	cpack,
		size_t	len,
		int *	idrstmpl,
		size_t	ndpts,
		float *	fld
	)

Unpack JPEG2000 compressed data into an array of floats, using info from the GRIB2 Data Representation Template 5.40 or 5.40000.

Parameters

cpack	The packed data.
len	The length of the packed data.
idrstmpl	Pointer to array of values for Data Representation Template 5.40 or 5.40000.
ndpts	The number of data values to unpack.
fld	A pointer that gets the unpacked data values as an array of float.

Returns

• G2C_NOERROR No error.
• G2C_ENOMEM Out of memory.

Author

Ed Hartnett

Date

2022-09-08

Definition at line 160 of file jpcunpack.c.

References G2C_JPEG_DRS_TEMPLATE_LEN, jpcunpack_int(), and LOG.

jpcunpack()

g2int jpcunpack	(	unsigned char *	cpack,
		g2int	len,
		g2int *	idrstmpl,
		g2int	ndpts,
		float *	fld
	)

Unpack JPEG2000 compressed data into an array of floats, using info from the GRIB2 Data Representation Template 5.40 or 5.40000.

Parameters

cpack	The packed data.
len	The length of the packed data.
idrstmpl	Pointer to array of values for Data Representation Template 5.40 or 5.40000.
ndpts	The number of data values to unpack.
fld	A pointer that gets the unpacked data values as an array of float.

Returns

• G2C_NOERROR No error.
• G2_JPCUNPACK_MEM Out of memory.

Author

Stephem Gilbert

Date

2003-08-27

Definition at line 124 of file jpcunpack.c.

References G2_JPCUNPACK_MEM, jpcunpack_int(), and LOG.

Referenced by g2c_unpack7_int().

jpcunpack_int()

static int jpcunpack_int ( unsigned char *  cpack, g2int  len, g2int *  idrstmpl, g2int  ndpts, void *  fld, int  fld_is_double, int  verbose  )

static

This internal function will unpack JPEG2000 compressed data into an array of floats or doubles, using info from the GRIB2 Data Representation Template 5.40 or 5.40000.

This function is used by jpcunpack(), g2c_jpcunpackf(), and g2c_jpcunpackd().

Parameters

cpack	The packed data.
len	The length of the packed data.
idrstmpl	Pointer to array of values for Data Representation Template 5.40 or 5.40000.
ndpts	The number of data values to unpack.
fld	A pointer that gets the unpacked data values.
fld_is_double	Non-zero if the data are to be unpacked into a double array, otherwise data will be unpacked into a float array.
verbose	If non-zero, error messages will be printed in case of error. Otherwise, error codes will be return but no error messages printed. Calls to the original g2c API may cause error messages to be printed in case of error. For the new g2c_ API, no error messages will be printed - instead an error code will be returned. Call g2c_strerror() to get the error message for any error code.

Returns

• G2C_NOERROR No error.
• G2C_ENOMEM Out of memory.

Author

Ed Hartnett

Date

2022-09-06

Definition at line 45 of file jpcunpack.c.

References dec_jpeg2000(), G2C_ENOMEM, G2C_NOERROR, int_power(), LOG, and rdieee().

Referenced by g2c_jpcunpackd(), g2c_jpcunpackf(), and jpcunpack().