buf.enc_ndr_short(length);
        buf.enc_ndr_short(0); /* length of auth_value */
        buf.enc_ndr_long(call_id);
    }
    void decode_header(NdrBuffer buf) throws NdrException {
         /* RPC major / minor version */
        if (buf.dec_ndr_small() != 5 || buf.dec_ndr_small() != 0)
            throw new NdrException("DCERPC version not supported");
        ptype = buf.dec_ndr_small();
        flags = buf.dec_ndr_small();

        buf.enc_ndr_short(0); /* length of auth_value */
        buf.enc_ndr_long(this.call_id);
    }


    void decode_header ( NdrBuffer buf ) throws NdrException {
        /* RPC major / minor version */
        if ( buf.dec_ndr_small() != 5 || buf.dec_ndr_small() != 0 ) {
            throw new NdrException("DCERPC version not supported");
        }
        this.ptype = buf.dec_ndr_small();