g2_unpack7.c File Reference

Unpack Section 7 (Data Section) as defined in GRIB Edition 2. More...

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

Go to the source code of this file.

Functions
g2int	g2_unpack7 (unsigned char *cgrib, g2int *iofst, g2int igdsnum, g2int *igdstmpl, g2int idrsnum, g2int *idrstmpl, g2int ndpts, float **fld)
	This subroutine unpacks Section 7 (Data Section) as defined in GRIB Edition 2. More...

Detailed Description

Unpack Section 7 (Data Section) as defined in GRIB Edition 2.

Author

Stephen Gilbert

Date

2002-10-31

Definition in file g2_unpack7.c.

Function Documentation

g2_unpack7()

g2int g2_unpack7	(	unsigned char *	cgrib,
		g2int *	iofst,
		g2int	igdsnum,
		g2int *	igdstmpl,
		g2int	idrsnum,
		g2int *	idrstmpl,
		g2int	ndpts,
		float **	fld
	)

This subroutine unpacks Section 7 (Data Section) as defined in GRIB Edition 2.

Program History Log

Date	Programmer	Comments
2002-10-31	Gilbert	Initial
2002-12-20	Gilbert	Added GDT info to arguments and added 5.51 processing.
2003-08-29	Gilbert	New templates using PNG and JPEG2000 algorithms/templates.
2004-11-29	Gilbert	JPEG2000 now allowed to use WMO Template 5.40 PNG allowed to use 5.41
2004-12-16	Taylor	Added check on comunpack return code.
2008-12-23	Wesley	Initialize Number of data points unpacked

Parameters

cgrib	char array containing Section 7 of the GRIB2 message
iofst	Bit offset of the beginning of Section 7 in cgrib.
igdsnum	Grid Definition Template Number (see Code Table 3.0) (Only used for DRS Template 5.51)
igdstmpl	Pointer to an integer array containing the data values for the specified Grid Definition Template (N=igdsnum). Each element of this integer array contains an entry (in the order specified) of Grid Definition Template 3.N. (Only used for DRS Template 5.51).
idrsnum	Data Representation Template Number (see Code Table 5.0)
idrstmpl	Pointer to an integer array containing the data values for the specified Data Representation Template (N=idrsnum). Each element of this integer array contains an entry (in the order specified) of Data Representation Template 5.N
ndpts	Number of data points unpacked and returned.
fld	Pointer to a float array containing the unpacked data field.

Returns

• G2_NO_ERROR No error.
• G2_UNPACK_BAD_SEC Array passed had incorrect section number.
• G2_UNPACK7_BAD_DRT Unrecognized Data Representation Template.
• G2_UNPACK7_WRONG_GDT need one of GDT 3.50 through 3.53 to decode DRT 5.51
• G2_UNPACK_NO_MEM Memory allocation error.
• G2_UNPACK7_CORRUPT_SEC Corrupt section 7.

Author

Stephen Gilbert

Date

2002-10-31

Definition at line 55 of file g2_unpack7.c.

References comunpack(), G2_NO_ERROR, G2_UNPACK7_BAD_DRT, G2_UNPACK7_CORRUPT_SEC, G2_UNPACK7_WRONG_GDT, G2_UNPACK_BAD_SEC, G2_UNPACK_NO_MEM, gbit(), jpcunpack(), pngunpack(), rdieee(), simunpack(), and specunpack().

Referenced by g2_getfld().