code: public static Pair<Integer, Integer> getUtf8Range(final byte[] buffer, final int offset,
        final int length) {
      final int start = getUtf8ByteStart(buffer, offset);
      final int end = getUtf8ByteEnd(buffer, offset + length - 1);
  
      return new Pair<>(start, end - start + 1);
    }
docs: Returns first and length.