g2_unpack7.c

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#include <stdio.h>
#include <stdlib.h>
#include <memory.h>
#include <string.h>
#include "grib2_int.h"
 
g2int
g2_unpack7(unsigned char *cgrib, g2int *iofst, g2int igdsnum, g2int *igdstmpl,
           g2int idrsnum, g2int *idrstmpl, g2int ndpts, float **fld)
{
    g2int isecnum;
    g2int ipos, lensec;
    float *lfld;
 
    *fld = NULL;
 
    gbit(cgrib, &lensec, *iofst, 32);        /* Get Length of Section */
    *iofst = *iofst + 32;
    gbit(cgrib, &isecnum, *iofst, 8);         /* Get Section Number */
    *iofst = *iofst + 8;
 
    if (isecnum != 7)
        return G2_UNPACK_BAD_SEC;
 
    ipos = *iofst / 8;
    if (!(lfld = calloc(ndpts ? ndpts : 1, sizeof(float))))
        return G2_UNPACK_NO_MEM;
 
    *fld = lfld;
 
    if (idrsnum == 0)
        simunpack(cgrib + ipos, idrstmpl, ndpts, lfld);
    else if (idrsnum == 2 || idrsnum == 3)
    {
        if (comunpack(cgrib+ipos, lensec, idrsnum, idrstmpl, ndpts, lfld))
            return G2_UNPACK7_CORRUPT_SEC;
    }
    else if (idrsnum == 50)
    {            /* Spectral Simple */
        simunpack(cgrib + ipos, idrstmpl, ndpts - 1, lfld + 1);
        rdieee(idrstmpl + 4, lfld, 1);
    }
    else if (idrsnum == 51)              /* Spectral complex */
    {
        if (igdsnum >= 50 && igdsnum <= 53)
            specunpack(cgrib + ipos, idrstmpl, ndpts, igdstmpl[0], igdstmpl[2],
                       igdstmpl[2], lfld);
        else
        {
            fprintf(stderr, "g2_unpack7: Cannot use GDT 3.%d to unpack Data Section 5.51.\n",
                    (int)igdsnum);
            if (lfld)
                free(lfld);
            *fld = NULL;
            return G2_UNPACK7_WRONG_GDT;
        }
    }
#if defined USE_JPEG2000 || defined USE_OPENJPEG
    else if (idrsnum == 40 || idrsnum == 40000)
    {
        jpcunpack(cgrib + ipos, lensec - 5, idrstmpl, ndpts, lfld);
    }
#endif  /* USE_JPEG2000 */
#ifdef USE_PNG
    else if (idrsnum == 41 || idrsnum == 40010)
    {
        pngunpack(cgrib + ipos, lensec - 5, idrstmpl, ndpts, lfld);
    }
#endif  /* USE_PNG */
    else
    {
        fprintf(stderr, "g2_unpack7: Data Representation Template 5.%d not yet "
                "implemented.\n", (int)idrsnum);
        if (lfld)
            free(lfld);
        *fld = NULL;
        return G2_UNPACK7_BAD_DRT;
    }
 
    *iofst = *iofst + (8 * lensec);
 
    return G2_NO_ERROR;
}