}
    protected void doReceiveFragment(byte[] buf, boolean isDirect) throws IOException {
        int off, flags, length;

        if (buf.length < max_recv)
            throw new IllegalArgumentException("buffer too small");

        if (isStart && !isDirect) { // start of new frag, do trans
            off = in.read(buf, 0, 1024);
        } else {
            off = in.readDirect(buf, 0, buf.length);
        }

    }


    @Override
    protected int doReceiveFragment ( byte[] buf ) throws IOException {
        if ( buf.length < getMaxRecv() ) {
            throw new IllegalArgumentException("buffer too small");
        }

        int off = this.handle.recv(buf, 0, buf.length);
        if ( buf[ 0 ] != 5 || buf[ 1 ] != 0 ) {
            throw new IOException("Unexpected DCERPC PDU header");
        }