NAME

       comunpack.c - Unpack a data field that was packed using a complex packing algorithm as
       defined in the GRIB2 documention.

SYNOPSIS

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

   Functions
       int comunpack (unsigned char *cpack, g2int lensec, g2int idrsnum, g2int *idrstmpl, g2int
           ndpts, g2float *fld)
           This subroutine unpacks a data field that was packed using a complex packing algorithm
           as defined in the GRIB2 documention, using info from the GRIB2 Data Representation
           Template 5.2 or 5.3.

Detailed Description

       Unpack a data field that was packed using a complex packing algorithm as defined in the
       GRIB2 documention.

       Author
           Stephen Gilbert

       Date
           2002-10-29

       Definition in file comunpack.c.

Function Documentation

   int comunpack (unsigned char * cpack, g2int lensec, g2int idrsnum, g2int * idrstmpl, g2int
       ndpts, g2float * fld)
       This subroutine unpacks a data field that was packed using a complex packing algorithm as
       defined in the GRIB2 documention, using info from the GRIB2 Data Representation Template
       5.2 or 5.3. Supports GRIB2 complex packing templates with or without spatial differences
       (i.e. DRTs 5.2 and 5.3).

       PROGRAM HISTORY LOG:

       • 2002-10-29 Gilbert

       • 2004-12-16 Gilbert Added test (provided by Arthur Taylor/MDL) to verify that group
         widths and lengths are consistent with section length.

       Parameters
           cpack pointer to the packed data field.
           lensec length of section 7 (used for error checking).
           idrsnum Data Representation Template number 5.N Must equal 2 or 3.
           idrstmpl pointer to the array of values for Data Representation Template 5.2 or 5.3
           ndpts The number of data values to unpack
           fld Contains the unpacked data values. fld must be allocated with at least
           ndpts*sizeof(g2float) bytes before calling this routine.

       Returns
           0 for success, error code otherwise.

       Author
           Stephen Gilbert

       Date
           2002-10-29

       Definition at line 39 of file comunpack.c.

       References gbit(), gbits(), int_power(), and rdieee().

       Referenced by g2_unpack7().

Author

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