LWGEOM_asBinary()

Datum LWGEOM_asBinary

(

PG_FUNCTION_ARGS

)

Definition at line 893 of file lwgeom_ogc.c.

{
        GSERIALIZED *geom;
        LWGEOM *lwgeom;
        uint8_t *wkb;
        size_t wkb_size;
        bytea *result;
        uint8_t variant = WKB_ISO;
 
        /* Get a 2D version of the geometry */
        geom = PG_GETARG_GSERIALIZED_P(0);
        lwgeom = lwgeom_from_gserialized(geom);
 
        /* If user specified endianness, respect it */
        if ( (PG_NARGS()>1) && (!PG_ARGISNULL(1)) )
        {
                text *wkb_endian = PG_GETARG_TEXT_P(1);
 
                if  ( ! strncmp(VARDATA(wkb_endian), "xdr", 3) ||
                      ! strncmp(VARDATA(wkb_endian), "XDR", 3) )
                {
                        variant = variant | WKB_XDR;
                }
                else
                {
                        variant = variant | WKB_NDR;
                }
        }
 
        /* Write to WKB and free the geometry */
        wkb = lwgeom_to_wkb(lwgeom, variant, &wkb_size);
        lwgeom_free(lwgeom);
 
        /* Write to text and free the WKT */
        result = palloc(wkb_size + VARHDRSZ);
        memcpy(VARDATA(result), wkb, wkb_size);
        SET_VARSIZE(result, wkb_size + VARHDRSZ);
        pfree(wkb);
 
        /* Return the text */
        PG_FREE_IF_COPY(geom, 0);
        PG_RETURN_BYTEA_P(result);
}

References lwgeom_free(), lwgeom_from_gserialized(), lwgeom_to_wkb(), variant, WKB_ISO, WKB_NDR, and WKB_XDR.

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