final State state;

    FbosByteSource(State state) {
      this.state = state;
    }

    @Override
    public InputStream openStream() throws IOException {
      return state.openInputStream();
    }
  }

  /**
   * Returns a readable {@link ByteSource} view of the data that has been written to this stream.
   *
   * @since 15.0
   */
  public ByteSource asByteSource() {