public int processBytes(
        byte[]      in,
        int         inOff,
        int         len,
        byte[]      out,
        int         outOff)
    {
        if (len < 0)
        {
            throw new IllegalArgumentException("Can't have a negative input length!");
        }

        int resultLen = 0;
        int gapLen = buf.length - bufOff;

        if (len > gapLen)
        {
            System.arraycopy(in, inOff, buf, bufOff, gapLen);

            resultLen += translator.encode(buf, 0, buf.length, out, outOff);

            bufOff = 0;

            len -= gapLen;
            inOff += gapLen;
            outOff += resultLen;

            int chunkSize = len - (len % buf.length);

            resultLen += translator.encode(in, inOff, chunkSize, out, outOff);

            len -= chunkSize;
            inOff += chunkSize;
        }

        if (len != 0)
        {
            System.arraycopy(in, inOff, buf, bufOff, len);

            bufOff += len;
        }

        return resultLen;
    }