code: public static String encodeBytes(byte[] source, int off, int len) {
          return encodeBytes(source, off, len, NO_OPTIONS);
      }
docs: Encodes a byte array into Base64 notation.
  Does not GZip-compress data.
  
  @param source The data to convert
  @param off    Offset in array where conversion should begin
  @param len    Length of data to convert
  @since 1.4