code: public void downloadRange(OutputStream output, long rangeStart, long rangeEnd) {
          this.downloadRange(output, rangeStart, rangeEnd, null);
      }
docs: Downloads a part of this file's contents, starting at rangeStart and stopping at rangeEnd.
  
  @param output     the stream to where the file will be written.
  @param rangeStart the byte offset at which to start the download.
  @param rangeEnd   the byte offset at which to stop the download.