sbuf[7] == (byte)'B') {
                break; /* all good */
            }
                                        /* out of phase maybe? */
                          /* inch forward 1 byte and try again */
            for (int i = 0; i < 35; i++) {
                sbuf[i] = sbuf[i + 1];
            }
            int b;
            if ((b = in.read()) == -1) return null;