std::string SerializeProto(const Message& message);

// Uses metadata contained in `chunked_message` to hash fields within the
// data accessed by the `reader` using `chunks_info`.
absl::StatusOr<uint64_t> HashFields(
    const ::tensorflow::proto_splitter::ChunkedMessage& chunked_message,
    riegeli::RecordReader<riegeli::FdReader<>>& reader,
    const std::vector<::tensorflow::proto_splitter::ChunkInfo>& chunks_info,