fbuf.reset();
        fbuf.setIndex(8);
        fbuf.setLength(fbuf.dec_ndr_short());

        if ( this.securityProvider != null ) {
            this.securityProvider.unwrap(fbuf);
        }
    }


    /**
     * @param msg
     * @param out
     * @return
     * @throws NdrException
     * @throws DcerpcException
     */

            buf.reset();
            buf.setIndex(8);
            buf.setLength(buf.dec_ndr_short());

            if (securityProvider != null)
                securityProvider.unwrap(buf);

            buf.setIndex(0);

            msg.decode_header(buf);

            off = 24;
            if (msg.ptype == 2 && msg.isFlagSet(DCERPC_LAST_FRAG) == false)
                off = msg.length;