if (t1.snd_buf_size < t2.snd_buf_size) {
            t2.snd_buf_size = t1.snd_buf_size;
        } else {
            t1.snd_buf_size = t2.snd_buf_size;
        }

        bsize = Math.min(t1.rcv_buf_size - 70, t1.snd_buf_size - 70);
        b = new byte[2][bsize];

        try {
            copyTo0(dest, b, bsize, w, req, resp);
        } finally {
            w.write(null, -1, null, 0);
        }