NAME

       g2_unpack4.c - Unpack Section 4 (Product Definition Section) as defined in GRIB Edition 2.

SYNOPSIS

       #include <stdio.h>
       #include <stdlib.h>
       #include 'grib2.h'

   Functions
       g2int g2_unpack4 (unsigned char *cgrib, g2int *iofst, g2int *ipdsnum, g2int **ipdstmpl,
           g2int *mappdslen, g2float **coordlist, g2int *numcoord)
           This subroutine unpacks Section 4 (Product Definition Section) as defined in GRIB
           Edition 2.

Detailed Description

       Unpack Section 4 (Product Definition Section) as defined in GRIB Edition 2.

       Author
           Stephen Gilbert

       Date
           2002-10-31

       Definition in file g2_unpack4.c.

Function Documentation

   g2int g2_unpack4 (unsigned char * cgrib, g2int * iofst, g2int * ipdsnum, g2int ** ipdstmpl,
       g2int * mappdslen, g2float ** coordlist, g2int * numcoord)
       This subroutine unpacks Section 4 (Product Definition Section) as defined in GRIB Edition
       2. PROGRAM HISTORY LOG:

       • 2002-10-31 Gilbert

       • 2009-01-14 Vuong Changed structure name template to gtemplate

       Parameters
           cgrib Char array containing Section 4 of the GRIB2 message.
           iofst Bit offset of the beginning of Section 4 in cgrib. Returned with updated bit
           offset.
           ipdsnum Product Definition Template Number (see Code Table 4.0).
           ipdstmpl Pointer to integer array containing the data values for the specified Product
           Definition Template (N=ipdsnum). Each element of this integer array contains an entry
           (in the order specified) of Product Defintion Template 4.N.
           mappdslen Number of elements in ipdstmpl. i.e. number of entries in Product Defintion
           Template 4.N (N=ipdsnum).
           coordlist Pointer to real array containing floating point values intended to document
           the vertical discretisation associated to model data on hybrid coordinate vertical
           levels. (part of Section 4).
           numcoord number of values in array coordlist.

       Returns

           • 0 no error

           • 2 Not section 4

           • 5 'GRIB' message contains an undefined Product Definition Template.

           • 6 memory allocation error

       Author
           Stephen Gilbert

       Date
           2002-10-31

       Definition at line 42 of file g2_unpack4.c.

       References gtemplate::ext, gtemplate::extlen, extpdstemplate(), gbit(), gbits(),
       getpdstemplate(), gtemplate::map, gtemplate::maplen, gtemplate::needext, and rdieee().

       Referenced by g2_getfld().

Author

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