(optional) File open flags. Can be undefined.
   * @returns nsIFileOutputStream to write to.
   * Note: The stream is initialized with the DEFER_OPEN behavior flag.
   *       See nsIFileOutputStream.
   */
  openSafeFileOutputStream: function FileUtils_openSafeFileOutputStream(
    file,
    modeFlags
  ) {
    var fos = Cc[
      "@mozilla.org/network/safe-file-output-stream;1"
    ].createInstance(Ci.nsIFileOutputStream);
    return this._initFileOutputStream(fos, file, modeFlags);
  },

  _initFileOutputStream: function FileUtils__initFileOutputStream(
    fos,
    file,
    modeFlags
  ) {
    if (modeFlags === undefined) {
      modeFlags = this.MODE_WRONLY | this.MODE_CREATE | this.MODE_TRUNCATE;
    }
    fos.init(file, modeFlags, this.PERMS_FILE, fos.DEFER_OPEN);
    return fos;
  },

  /**
   * Closes an atomic file output stream.
   *
   * @param   stream
   *          The stream to close.
   */
  closeAtomicFileOutputStream: function FileUtils_closeAtomicFileOutputStream(
    stream
  ) {
    if (stream instanceof Ci.nsISafeOutputStream) {
      try {
        stream.finish();
        return;
      } catch (e) {}
    }
    stream.close();
  },

  /**
   * Closes a safe file output stream.
   *
   * @param   stream
   *          The stream to close.
   */
  closeSafeFileOutputStream: function FileUtils_closeSafeFileOutputStream(
    stream
  ) {
    if (stream instanceof Ci.nsISafeOutputStream) {
      try {
        stream.finish();
        return;
      } catch (e) {}
    }
    stream.close();
  },

  File: Components.Constructor(
    "@mozilla.org/file/local;1",
    Ci.nsIFile,
    "initWithPath"
  ),
};
PK