private static Charset fsCharset() {
    if (!SystemInfoRt.isWindows && !SystemInfoRt.isMac) {
      String property = System.getProperty("sun.jnu.encoding");
      if (property != null) {
        try {
          return Charset.forName(property);
        }
        catch (Exception e) {
          LoggerRt.getInstance(PathUtilRt.class).warn("unknown JNU charset: " + property, e);
        }
      }
    }

    return null;
  }
private static Charset fsCharset()