LWGEOM_asHEXEWKB()

Datum LWGEOM_asHEXEWKB

(

PG_FUNCTION_ARGS

)

Definition at line 293 of file lwgeom_inout.c.

{
        GSERIALIZED *geom = PG_GETARG_GSERIALIZED_P(0);
        LWGEOM *lwgeom;
        char *hexwkb;
        size_t hexwkb_size;
        uint8_t variant = 0;
        text *result;
        text *type;
        size_t text_size;
 
        /* If user specified endianness, respect it */
        if ( (PG_NARGS()>1) && (!PG_ARGISNULL(1)) )
        {
                type = PG_GETARG_TEXT_P(1);
 
                if  ( ! strncmp(VARDATA(type), "xdr", 3) ||
                      ! strncmp(VARDATA(type), "XDR", 3) )
                {
                        variant = variant | WKB_XDR;
                }
                else
                {
                        variant = variant | WKB_NDR;
                }
        }
 
        /* Create WKB hex string */
        lwgeom = lwgeom_from_gserialized(geom);
        hexwkb = lwgeom_to_hexwkb(lwgeom, variant | WKB_EXTENDED, &hexwkb_size);
        lwgeom_free(lwgeom);
 
        /* Prepare the PgSQL text return type */
        text_size = hexwkb_size - 1 + VARHDRSZ;
        result = palloc(text_size);
        memcpy(VARDATA(result), hexwkb, hexwkb_size - 1);
        SET_VARSIZE(result, text_size);
 
        /* Clean up and return */
        lwfree(hexwkb);
        PG_FREE_IF_COPY(geom, 0);
        PG_RETURN_TEXT_P(result);
}

References lwfree(), lwgeom_free(), lwgeom_from_gserialized(), lwgeom_to_hexwkb(), variant, WKB_EXTENDED, WKB_NDR, and WKB_XDR.

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