absl::Status AddString(const char* str, size_t len);

  // Fill content into a buffer and returns the number of bytes stored.
  // The function allocates space for the buffer but does NOT take ownership.
  int WriteToBuffer(char** buffer);

 private:
  // Data buffer to store contents of strings, not including headers.
  std::vector<char> data_;
  // Offset of the starting index of each string in data buffer.

  data_.resize(data_.size() + len);
  memcpy(data_.data() + offset_.back(), str, len);
  offset_.push_back(offset_.back() + len);
  return absl::OkStatus();
}

int MiniDynamicBuffer::WriteToBuffer(char** buffer) {
  // Allocate sufficient memory to tensor buffer.
  int32_t num_strings = offset_.size() - 1;
  // Total bytes include:
  //   * size of content (data_.size)