save_data

# File lib/pstore.rb, line 459
  def save_data(original_checksum, original_file_size, file)
    # We only want to save the new data if the size or checksum has changed.
    # This results in less filesystem calls, which is good for performance.
    if marshal_dump_supports_canonical_option?
      new_data = Marshal.dump(@table, -1, true)
    else
      new_data = dump(@table)
    end
    new_checksum = Digest::MD5.digest(new_data)

    if new_data.size != original_file_size || new_checksum != original_checksum
      if @ultra_safe && !on_windows?
        # Windows doesn't support atomic file renames.
        save_data_with_atomic_file_rename_strategy(new_data, file)
      else
        save_data_with_fast_strategy(new_data, file)
      end
    end

    new_data.replace(EMPTY_STRING)
  end