/**
     * Default constructor.
     */
    public Hexdump() {
        // Utility class - no instance variables to initialize
    }

    private static final String NL = System.lineSeparator();
    private static final int NL_LENGTH = NL.length();

    private static final char[] SPACE_CHARS =
            { ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ',

          "a.b.c.1.2.3.ca.us",
          "a\u7f51\u7edcA.\u7f51\u7edc.Cn", // "a网络A.网络.Cn"
          "cnn.ca",
          "cool.co.uk",
          "cool.de",
          "cool.dk",
          "cool.es",
          "cool.nl",
          "cool.se",
          "cool\uFF61fr", // Alternate dot character
          "foo.bar.google.com",
          "google.Co.uK",
          "google.com",
          "home.netscape.com",