gistfile1.txt

  private static int indexOf(byte c) {
    if (c == '-') {
      return 26;
    } else if (c >= '0' && c <= '9') {
      return c;
    } else if (c >= 'A' && c <= 'Z') {
      return c - 'A';
    } else if (c >= 'a' && c <= 'z') {
      return c - 'a';
    } else {
      throw new IllegalArgumentException("Invalid char: " + (char) c);
    }
  }