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#include <stdio.h>
#include <stdlib.h>
#include "grib2.h"
g2int g2_unpack3(unsigned char *,g2int *,g2int **,g2int **,
g2int *,g2int **,g2int *);
g2int getpoly(unsigned char *csec3,g2int *jj,g2int *kk,g2int *mm)
//$$$ SUBPROGRAM DOCUMENTATION BLOCK
// . . . .
// SUBPROGRAM: getpoly
// PRGMMR: Gilbert ORG: W/NP11 DATE: 2002-12-11
//
// ABSTRACT: This subroutine returns the J, K, and M pentagonal resolution
// parameters specified in a GRIB Grid Definition Section used
// spherical harmonic coefficients using GDT 5.50 through 5.53
//
// PROGRAM HISTORY LOG:
// 2002-12-11 Gilbert
//
// USAGE: int getpoly(unsigned char *csec3,g2int *jj,g2int *kk,g2int *mm)
// INPUT ARGUMENTS:
// csec3 - Character array that contains the packed GRIB2 GDS
//
// OUTPUT ARGUMENTS:
// JJ = J - pentagonal resolution parameter
// KK = K - pentagonal resolution parameter
// MM = M - pentagonal resolution parameter
//
// REMARKS: Returns JJ, KK, and MM set to zero, if grid template
// not recognized.
//
// ATTRIBUTES:
// LANGUAGE: C
// MACHINE: IBM SP
//
//$$$
{
g2int *igdstmpl,*list_opt;
g2int *igds;
g2int iofst,igdtlen,num_opt,jerr;
iofst=0; // set offset to beginning of section
jerr=g2_unpack3(csec3,&iofst,&igds,&igdstmpl,
&igdtlen,&list_opt,&num_opt);
if (jerr == 0) {
switch ( igds[4] ) // Template number
{
case 50: // Spherical harmonic coefficients
case 51:
case 52:
case 53:
{
*jj=igdstmpl[0];
*kk=igdstmpl[1];
*mm=igdstmpl[2];
break;
}
default:
{
*jj=0;
*kk=0;
*mm=0;
break;
}
} // end switch
}
else {
*jj=0;
*kk=0;
*mm=0;
}
if (igds != 0) free(igds);
if (igdstmpl != 0) free(igdstmpl);
if (list_opt != 0) free(list_opt);
return 0;
}
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