RASTER_getBandPixelTypeName()

Datum RASTER_getBandPixelTypeName

(

PG_FUNCTION_ARGS

)

Definition at line 122 of file rtpg_band_properties.c.

{
    rt_pgraster *pgraster = NULL;
    rt_raster raster = NULL;
    rt_band band = NULL;
    rt_pixtype pixtype;
    int32_t bandindex;
    const size_t name_size = 8; /* size of type name */
    size_t size = 0;
    char *ptr = NULL;
    text *result = NULL;
 
    /* Deserialize raster */
    if (PG_ARGISNULL(0)) PG_RETURN_NULL();
    pgraster = (rt_pgraster *)PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
 
    /* Index is 1-based */
    bandindex = PG_GETARG_INT32(1);
    if ( bandindex < 1 ) {
        elog(NOTICE, "Invalid band index (must use 1-based). Returning NULL");
        PG_FREE_IF_COPY(pgraster, 0);
        PG_RETURN_NULL();
    }
 
    raster = rt_raster_deserialize(pgraster, FALSE);
    if ( ! raster ) {
        PG_FREE_IF_COPY(pgraster, 0);
        elog(ERROR, "RASTER_getBandPixelTypeName: Could not deserialize raster");
        PG_RETURN_NULL();
    }
 
    /* Fetch requested band and its pixel type */
    band = rt_raster_get_band(raster, bandindex - 1);
    if ( ! band ) {
        elog(NOTICE, "Could not find raster band of index %d when getting pixel type name. Returning NULL", bandindex);
        rt_raster_destroy(raster);
        PG_FREE_IF_COPY(pgraster, 0);
        PG_RETURN_NULL();
    }
 
    pixtype = rt_band_get_pixtype(band);
 
    result = palloc(VARHDRSZ + name_size);
    /* We don't need to check for NULL pointer, because if out of memory, palloc
     * exit via elog(ERROR). It never returns NULL.
     */
 
    memset(VARDATA(result), 0, name_size);
    ptr = (char *)result + VARHDRSZ;
                strcpy(ptr, rt_pixtype_name(pixtype));
 
    size = VARHDRSZ + strlen(ptr);
    SET_VARSIZE(result, size);
 
    rt_raster_destroy(raster);
    PG_FREE_IF_COPY(pgraster, 0);
 
    PG_RETURN_TEXT_P(result);
}

References FALSE, rt_band_get_pixtype(), rt_pixtype_name(), rt_raster_deserialize(), rt_raster_destroy(), and rt_raster_get_band().

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