RASTER_getBandPath()

Datum RASTER_getBandPath

(

PG_FUNCTION_ARGS

)

Definition at line 284 of file rtpg_band_properties.c.

References ovdump::band, FALSE, rtrowdump::raster, rt_band_destroy(), rt_band_get_ext_path(), rt_raster_deserialize(), rt_raster_destroy(), and rt_raster_get_band().

Referenced by RASTER_bandIsNoData().

{
        rt_pgraster *pgraster = NULL;
        rt_raster raster = NULL;
        rt_band band = NULL;
        int32_t bandindex;
        const char *bandpath;
        text *result;

        /* Index is 1-based */
        bandindex = PG_GETARG_INT32(1);
        if ( bandindex < 1 ) {
                elog(NOTICE, "Invalid band index (must use 1-based). Returning NULL");
                PG_RETURN_NULL();
        }

        /* Deserialize raster */
        if (PG_ARGISNULL(0)) PG_RETURN_NULL();
        pgraster = (rt_pgraster *)PG_DETOAST_DATUM(PG_GETARG_DATUM(0));

        raster = rt_raster_deserialize(pgraster, FALSE);
        if (!raster) {
                PG_FREE_IF_COPY(pgraster, 0);
                elog(ERROR, "RASTER_getBandPath: Could not deserialize raster");
                PG_RETURN_NULL();
        }

        /* Fetch requested band */
        band = rt_raster_get_band(raster, bandindex - 1);
        if (!band) {
                elog(
                        NOTICE,
                        "Could not find raster band of index %d when getting band path. Returning NULL",
                        bandindex
                );
                rt_raster_destroy(raster);
                PG_FREE_IF_COPY(pgraster, 0);
                PG_RETURN_NULL();
        }

        bandpath = rt_band_get_ext_path(band);
        if (!bandpath) {
                rt_band_destroy(band);
                rt_raster_destroy(raster);
                PG_FREE_IF_COPY(pgraster, 0);
                PG_RETURN_NULL();
        }

        result = (text *) palloc(VARHDRSZ + strlen(bandpath) + 1);
        SET_VARSIZE(result, VARHDRSZ + strlen(bandpath) + 1);
        strcpy((char *) VARDATA(result), bandpath);

        rt_band_destroy(band);
        rt_raster_destroy(raster);
        PG_FREE_IF_COPY(pgraster, 0);

        PG_RETURN_TEXT_P(result);
}

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