docs: public static void decodeFieldData(BaseField field, String string)
      {
          if ((string == null) || (string.length() == 0))
              return;
          byte[] ba = Base64.decode(string.toCharArray());
          InputStream is = new ByteArrayInputStream(ba);
          DataInputStream daIn = new DataInputStream(is);
          field.read(daIn, false);
      }