gistfile1.rb

module IntIp

  def ip2int(ip)
    return 0 unless ip =~ /\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/

    v = ip.split('.').collect { |i| i.to_i }
    return (v[0] << 24) | (v[1] << 16) | (v[2] << 8 ) | (v[3]);
  end

  def int2ip(int)
    tmp = int.to_i
    parts = []

    3.times do |i|
      tmp = tmp / 256.0
      parts << (256 * (tmp - tmp.to_i)).to_i
    end

    parts << tmp.to_i
    parts.reverse.join('.')
  end

end