/**
  * Decrease the segment count in the according row of the main window download table.
  *
  * @param filename The filename of the row to update in main window
  */
 private void decrSegCount(final String filename) {
   SwingUtilities.invokeLater(
       new Runnable() {
         public void run() {
           mainApp.decrSegCount(filename);
         }
       });
 }
  /**
   * Update the progress bar of the currently downloaded file in main window. Only update if progess
   * has at least increased by one percent of the total file size of the downloaded file.
   *
   * @param downloadedBytes The current amount of downloaded bytes
   * @param lastProgBarUpdate The byte count at the last progress bar update
   * @param file The download file
   * @return The byte count at the last progress bar update
   */
  private int updateProgressBar(int downloadedBytes, int lastProgBarUpdate, DownloadFile file) {
    int totalSize = (int) file.getTotalFileSize();

    // only update progess bar if progess has at least increased by one percent
    int diff = downloadedBytes - lastProgBarUpdate;
    int onePercent = (int) totalSize / 100;
    if (diff >= onePercent) {
      final String filename = file.getFilename();
      final int db = downloadedBytes;
      SwingUtilities.invokeLater(
          new Runnable() {
            public void run() {
              mainApp.updateDownloadQueue(filename, db);
            }
          });

      return downloadedBytes; // prog bar updated, so return the new byte count
    }

    return lastProgBarUpdate; // no update, so return the previous byte count
  }
  /**
   * This method is called when a whole download file has been finished downloading. It updates main
   * application window and starts the decoding thread.
   *
   * @param dlFile The DownloadFile object that is finished
   */
  private void handleFinishedDlFile(final DownloadFile dlFile) {
    final String filename = dlFile.getFilename();
    logger.msg("File downloading finished: " + filename, MyLogger.SEV_INFO);

    // notify application that download has finished
    SwingUtilities.invokeLater(
        new Runnable() {
          public void run() {
            mainApp.fileDownloadFinished(filename);
            mainApp.setProgBarToDecoding(filename, dlFile.getSegCount());
          }
        });

    // create result vector
    Vector<byte[]> articleData = new Vector<byte[]>();
    Vector<RspHandler> rspHandlers = dlFileRspHandlerMap.get(dlFile);
    for (int i = 0; i < rspHandlers.size(); i++) {
      byte[] tmpArray = removeFirstLine(rspHandlers.get(i).getData(true));
      articleData.add(tmpArray);
      rspHandlers.set(i, null); // free some memory
    }

    // call garbage collector
    rspHandlers = null;
    dlFileRspHandlerMap.remove(dlFile);
    Runtime.getRuntime().gc();

    logger.msg(
        "First line(s) dump:\n" + HelloNzbToolkit.firstLineFromByteData(articleData.get(0), 2),
        MyLogger.SEV_DEBUG);

    // determine data encoding (yenc or UU)
    String encoding = null;
    boolean bHasData = false;
    for (int i = 0; i < articleData.size(); i++) {
      byte[] abyteHelp = articleData.get(i);
      if (abyteHelp.length > 0) {
        bHasData = true;
        if (bytesEqualsString(abyteHelp, "=ybegin")) {
          encoding = "yenc";
          break;
        } else if (bytesEqualsString(abyteHelp, "begin ")) {
          encoding = "uu";
          break;
        }
      }
    }
    if (encoding == null) {
      if (bHasData) {
        encoding = "yenc";
        logger.msg(
            "No suitable decoder (no data) found for downloaded file: "
                + dlFile.getFilename()
                + " -- Assuming yenc.",
            MyLogger.SEV_WARNING);
      } else {
        // too bad, no decoder found for this file :(
        logger.msg(
            "No suitable decoder found for downloaded file (no data): " + dlFile.getFilename(),
            MyLogger.SEV_ERROR);

        // update main application window
        SwingUtilities.invokeLater(
            new Runnable() {
              public void run() {
                mainApp.fileDecodingFinished(dlFile.getFilename());
              }
            });

        return;
      }
    }

    /*
     * // determine data encoding String encoding = null;
     * if(bytesEqualsString(articleData.get(0), "=ybegin")) encoding =
     * "yenc"; else if(bytesEqualsString(articleData.get(0), "begin "))
     * encoding = "uu"; else { // too bad, no decoder found for this file :(
     * logger.msg("No suitable decoder found for downloaded file: " +
     * dlFile.getFilename(), MyLogger.SEV_ERROR);
     *
     * // update main application window SwingUtilities.invokeLater(new
     * Runnable() { public void run() {
     * mainApp.fileDecodingFinished(dlFile.getFilename()); } } );
     *
     * return; }
     */

    // start data decoding background thread
    FileDecoder fileDecoder = new FileDecoder(mainApp, dlDir, dlFile, articleData, encoding);
    Thread t = new Thread(fileDecoder);
    t.start();
  }