code      * @param offset      *            the position within the input array at which to start      * @param len      *            the number of bytes of input to decode      * @param flags      *            controls certain features of the decoded output. Pass {@code DEFAULT} to decode standard Base00.      *       * @throws IllegalArgumentException      *             if the input contains incorrect padding      */     public static byte[] decode(byte[] input, int offset, int len, int flags) {         