uuid pack/unpack

uuid.rb

def packuuid(uuid)
  uuid.split('-').pack("H8H4H4H4H12")
end
def unpackuuid(byte)
  byte.unpack("H8H4H4H4H12").join('-')
end

uuid = "43e1254f-2d13-4193-b4b4-b9520ef0e9f3"
p uuid.length #=> 36
packed = packuuid(uuid)
p packed #=> "C\xE1%O-\x13A\x93\xB4\xB4\xB9R\x0E\xF0\xE9\xF3"
p packed.length #=> 16
p unpackuuid(packed) #=> "43e1254f-2d13-4193-b4b4-b9520ef0e9f3"