cur.setReadSize(rl);
            int len = cur.decode(buffer, 0);

            if (len > rl) {
                throw new IOException(String.format("WHAT? ( read %d decoded %d ): %s", rl, len, cur));
            }
            if (nextCommand != 0 && len > nextCommand) {
                throw new IOException("Overlapping commands");
            }