buf.setIndex(0);
                securityProvider.wrap(buf);
            }

            tot = buf.getLength() - 24;
            off = 0;

            while (off < tot) {
                n = tot - off;

                if ((24 + n) > max_xmit) {
                    msg.flags &= ~DCERPC_LAST_FRAG;
                    n = max_xmit - 24;
                } else {

        if( len == 0 ) {
            return 0;
        }
        tot = 0;

        while( true ) {
            while( bip > 0 ) {
                n = in.read( b, off, Math.min( len, bip ));
                if( n == -1 ) {
                    return tot > 0 ? tot : -1;
                }
                tot += n;
                off += n;
                len -= n;
                bip -= n;