# File lib/l3/misc.rb, line 55
    def Misc.checksum(data)
      num_shorts = data.length / 2
      csum = 0
      count = data.length
      
      data.unpack("S#{num_shorts}").each { |x|
        csum += x
        count -= 2
      }

      if (count == 1)
        csum += data[data.length - 1]
      end

      csum = (csum >> 16) + (csum & 0xffff)
      csum = ~((csum >> 16) + csum) & 0xffff
      ([csum].pack("S*")).unpack("n*")[0]
    end

# File lib/l3/misc.rb, line 46
    def Misc.ipv42long(ip)
      quad = ip.split(/\./)
      quad.collect! {|s| s.to_i}
      # XXX: replace this with an inject
      quad[3] + (256 * quad[2]) + ((256**2) * quad[1]) + ((256**3) * quad[0])
    end

# File lib/l3/misc.rb, line 32
    def Misc.long2ipv4(long)
      quad = Array.new(4)
      quad[0] = (long >> 24) & 255
      quad[1] = (long >> 16) & 255
      quad[2] = (long >> 8 ) & 255
      quad[3] = long & 255
      quad.join(".")
    end

# File lib/l3/misc.rb, line 41
    def Misc.long2ipv6(long)
    end