g2_unpack7.c

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#include <memory.h>
#include <string.h>
#include "grib2_int.h"
 
static g2int
g2c_unpack7_int(unsigned char *cgrib, g2int *iofst, g2int igdsnum, g2int *igdstmpl,
                g2int idrsnum, g2int *idrstmpl, g2int ndpts, int v1, float **fld)
{
    g2int isecnum;
    g2int ipos, lensec;
    float *lfld;
 
    assert(cgrib && iofst && idrstmpl && fld);
    
    LOG((2, "g2c_unpack7_int *iofst %ld igdsnum %ld idrsnum %ld ndpts %ld v1 %d",
         *iofst, igdsnum, idrsnum, ndpts, v1));
    
    /* Get Length of Section */
    gbit(cgrib, &lensec, *iofst, 32);
    *iofst = *iofst + 32;
    LOG((3, "lensec %ld", lensec));
 
    /* Get Section Number */
    gbit(cgrib, &isecnum, *iofst, 8);
    *iofst = *iofst + 8;
 
    if (isecnum != 7)
        return G2_UNPACK_BAD_SEC;
 
    ipos = *iofst / 8;
 
    /* If we're using the V1 API, allocate memory for the unpacked
     * data. If we are using the v2 API, the caller is responsible for
     * allocating memory to hold the data. */
    if (v1)
    {
        if (!(lfld = calloc(ndpts ? ndpts : 1, sizeof(float))))
            return G2_UNPACK_NO_MEM;
        *fld = lfld;
    }
    else
        lfld = *fld;
 
    if (idrsnum == 0)
    {
        simunpack(cgrib + ipos, idrstmpl, ndpts, *fld);
    }
    else if (idrsnum == 2 || idrsnum == 3)
    {
        if (comunpack(cgrib+ipos, lensec, idrsnum, idrstmpl, ndpts, *fld))
            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
        {
            if (v1)
                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, *fld);
    }
#endif  /* USE_JPEG2000 */
#ifdef USE_PNG
    else if (idrsnum == 41 || idrsnum == 40010)
    {
        pngunpack(cgrib + ipos, lensec - 5, idrstmpl, ndpts, *fld);
    }
#endif  /* USE_PNG */
#ifdef USE_AEC
    else if (idrsnum == 42)
    {
        aecunpack(cgrib + ipos, lensec - 5, idrstmpl, ndpts, *fld);
    }
#endif  /* USE_AEC */
    else
    {
        if (v1)
            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;
}
 
g2int
g2_unpack7(unsigned char *cgrib, g2int *iofst, g2int igdsnum, g2int *igdstmpl,
           g2int idrsnum, g2int *idrstmpl, g2int ndpts, float **fld)
{
    return g2c_unpack7_int(cgrib, iofst, igdsnum, igdstmpl, idrsnum, idrstmpl,
                           ndpts, 1, fld);
}
 
int
g2c_unpack7(unsigned char *cgrib, int igdsnum, int gds_tmpl_len, long long int *gdstmpl,
            int idrsnum, int drs_tmpl_len, long long int *drstmpl, int ndpts, float *fld)
{
    g2int iofst = 0;
    g2int *igdstmpl = NULL, *idrstmpl;
    int i;
    int ret;
 
    LOG((1, "g2c_unpack7 igdsnum %d gds_tmpl_len %d idrsnum %d drs_tmpl_len %d ndpts %d",
         igdsnum, gds_tmpl_len, idrsnum, drs_tmpl_len, ndpts));
 
    /* Check inputs. */
    assert(cgrib && drstmpl && fld);
    if (gds_tmpl_len && !gdstmpl)
        return G2C_EINVAL;
 
    /* Allocate memory to hold the g2int versions of the DRS and GDS
     * template arrays. */
    if (gds_tmpl_len)
        if (!(igdstmpl = malloc(gds_tmpl_len * sizeof(g2int))))
            return G2C_ENOMEM;
    if (!(idrstmpl = malloc(drs_tmpl_len * sizeof(g2int))))
    return G2C_ENOMEM;
 
    /* Copy the templates. */
    if (gds_tmpl_len)
        for (i = 0; i < gds_tmpl_len; i++)
            igdstmpl[i] = gdstmpl[i];
    for (i = 0; i < drs_tmpl_len; i++)
    idrstmpl[i] = drstmpl[i];
    
    /* Call the internal function that does the work. */
    ret = g2c_unpack7_int(cgrib, &iofst, igdsnum, igdstmpl, idrsnum, idrstmpl,
              ndpts, 0, &fld);
 
    /* Free the g2int versions of the templates. */
    if (igdstmpl)
        free(igdstmpl);
    free(idrstmpl);
 
    return ret;
}