Method copyTo

android/guava/src/com/google/common/io/ByteSource.java:249–262

Copies the contents of this byte source to the given {@code OutputStream}. Does not close {@code output}. @return the number of bytes copied @throws IOException if an I/O error occurs while reading from this source or writing to {@code output}

(OutputStream output)

   *     output}
   */
  @CanIgnoreReturnValue
  public long copyTo(OutputStream output) throws IOException {
    checkNotNull(output);

    Closer closer = Closer.create();
    try {
      InputStream in = closer.register(openStream());
      return ByteStreams.copy(in, output);
    } catch (Throwable e) {
      throw closer.rethrow(e);
    } finally {
      closer.close();
    }
  }

  /**
   * Copies the contents of this byte source to the given {@code ByteSink}.