- apply_mask _ Maskbits.None = IPv4Address.None
- apply_mask addr mask
- | mask == ThirtyTwo = ipv4address_from_octets oct1 oct2 oct3 oct4
- | mask == ThirtyOne = ipv4address_from_octets oct1 oct2 oct3 (apply_mask oct4 Seven)
- | mask == Thirty = ipv4address_from_octets oct1 oct2 oct3 (apply_mask oct4 Six)
- | mask == TwentyNine = ipv4address_from_octets oct1 oct2 oct3 (apply_mask oct4 Five)
- | mask == TwentyEight = ipv4address_from_octets oct1 oct2 oct3 (apply_mask oct4 Four)
- | mask == TwentySeven = ipv4address_from_octets oct1 oct2 oct3 (apply_mask oct4 Three)
- | mask == TwentySix = ipv4address_from_octets oct1 oct2 oct3 (apply_mask oct4 Two)
- | mask == TwentyFive = ipv4address_from_octets oct1 oct2 oct3 (apply_mask oct4 One)
- | mask == TwentyFour = ipv4address_from_octets oct1 oct2 oct3 (min_octet)
- | mask == TwentyThree = ipv4address_from_octets oct1 oct2 (apply_mask oct3 Seven) (min_octet)
- | mask == TwentyTwo = ipv4address_from_octets oct1 oct2 (apply_mask oct3 Six) (min_octet)
- | mask == TwentyOne = ipv4address_from_octets oct1 oct2 (apply_mask oct3 Five) (min_octet)
- | mask == Twenty = ipv4address_from_octets oct1 oct2 (apply_mask oct3 Four) (min_octet)
- | mask == Nineteen = ipv4address_from_octets oct1 oct2 (apply_mask oct3 Three) (min_octet)
- | mask == Eighteen = ipv4address_from_octets oct1 oct2 (apply_mask oct3 Two) (min_octet)
- | mask == Seventeen = ipv4address_from_octets oct1 oct2 (apply_mask oct3 One) (min_octet)
- | mask == Sixteen = ipv4address_from_octets oct1 oct2 (min_octet) (min_octet)
- | mask == Fifteen = ipv4address_from_octets oct1 (apply_mask oct2 Seven) (min_octet) (min_octet)
- | mask == Fourteen = ipv4address_from_octets oct1 (apply_mask oct2 Six) (min_octet) (min_octet)
- | mask == Thirteen = ipv4address_from_octets oct1 (apply_mask oct2 Five) (min_octet) (min_octet)
- | mask == Twelve = ipv4address_from_octets oct1 (apply_mask oct2 Four) (min_octet) (min_octet)
- | mask == Eleven = ipv4address_from_octets oct1 (apply_mask oct2 Three) (min_octet) (min_octet)
- | mask == Ten = ipv4address_from_octets oct1 (apply_mask oct2 Two) (min_octet) (min_octet)
- | mask == Nine = ipv4address_from_octets oct1 (apply_mask oct2 One) (min_octet) (min_octet)
- | mask == Eight = ipv4address_from_octets oct1 (min_octet) (min_octet) (min_octet)
- | mask == Seven = ipv4address_from_octets (apply_mask oct1 Seven) (min_octet) (min_octet) (min_octet)
- | mask == Six = ipv4address_from_octets (apply_mask oct1 Six) (min_octet) (min_octet) (min_octet)
- | mask == Five = ipv4address_from_octets (apply_mask oct1 Five) (min_octet) (min_octet) (min_octet)
- | mask == Four = ipv4address_from_octets (apply_mask oct1 Four) (min_octet) (min_octet) (min_octet)
- | mask == Three = ipv4address_from_octets (apply_mask oct1 Three) (min_octet) (min_octet) (min_octet)
- | mask == Two = ipv4address_from_octets (apply_mask oct1 Two) (min_octet) (min_octet) (min_octet)
- | mask == One = ipv4address_from_octets (apply_mask oct1 One) (min_octet) (min_octet) (min_octet)
- | mask == Zero = ipv4address_from_octets (min_octet) (min_octet) (min_octet) (min_octet)
- | otherwise = IPv4Address.None
- where
- oct1 = (octet1 addr)
- oct2 = (octet2 addr)
- oct3 = (octet3 addr)
- oct4 = (octet4 addr)
-
-
--- We don't export our constructor so this function is the only
--- way to construct an address from octets. As a result, we can
--- return IPv4Address.None in response to being passed one of more
--- Octet.None octets.
-ipv4address_from_octets :: Octet -> Octet -> Octet -> Octet -> IPv4Address
-ipv4address_from_octets oct1 oct2 oct3 oct4
- | or [oct1 == Octet.None,
- oct2 == Octet.None,
- oct3 == Octet.None,
- oct4 == Octet.None] = IPv4Address.None
- | otherwise = IPv4Address oct1 oct2 oct3 oct4
-
-
--- Given two addresses, find the number of the most significant bit
--- where they differ. If the addresses are the same, return
--- Maskbits.Zero.
+
+ apply_mask addr mask bit
+ | mask == ThirtyTwo = addr
+ | mask == ThirtyOne = addr { octet4 = (apply_mask oct4 Seven bit) }
+ | mask == Thirty = addr { octet4 = (apply_mask oct4 Six bit) }
+ | mask == TwentyNine = addr { octet4 = (apply_mask oct4 Five bit) }
+ | mask == TwentyEight = addr { octet4 = (apply_mask oct4 Four bit) }
+ | mask == TwentySeven = addr { octet4 = (apply_mask oct4 Three bit) }
+ | mask == TwentySix = addr { octet4 = (apply_mask oct4 Two bit) }
+ | mask == TwentyFive = addr { octet4 = (apply_mask oct4 One bit) }
+ | mask == TwentyFour = addr { octet4 = (apply_mask oct4 Zero bit) }
+ | mask == TwentyThree = addr { octet3 = (apply_mask oct3 Seven bit),
+ octet4 = (apply_mask oct4 Zero bit) }
+ | mask == TwentyTwo = addr { octet3 = (apply_mask oct3 Six bit),
+ octet4 = (apply_mask oct4 Zero bit) }
+ | mask == TwentyOne = addr { octet3 = (apply_mask oct3 Five bit),
+ octet4 = (apply_mask oct4 Zero bit) }
+ | mask == Twenty = addr { octet3 = (apply_mask oct3 Four bit),
+ octet4 = (apply_mask oct4 Zero bit) }
+ | mask == Nineteen = addr { octet3 = (apply_mask oct3 Three bit),
+ octet4 = (apply_mask oct4 Zero bit) }
+ | mask == Eighteen = addr { octet3 = (apply_mask oct3 Two bit),
+ octet4 = (apply_mask oct4 Zero bit) }
+ | mask == Seventeen = addr { octet3 = (apply_mask oct3 One bit),
+ octet4 = (apply_mask oct4 Zero bit) }
+ | mask == Sixteen = addr { octet3 = (apply_mask oct3 Zero bit),
+ octet4 = (apply_mask oct4 Zero bit) }
+ | mask == Fifteen = addr { octet2 = (apply_mask oct2 Seven bit),
+ octet3 = (apply_mask oct3 Zero bit),
+ octet4 = (apply_mask oct4 Zero bit) }
+ | mask == Fourteen = addr { octet2 = (apply_mask oct2 Six bit),
+ octet3 = (apply_mask oct3 Zero bit),
+ octet4 = (apply_mask oct4 Zero bit)}
+ | mask == Thirteen = addr { octet2 = (apply_mask oct2 Five bit),
+ octet3 = (apply_mask oct3 Zero bit),
+ octet4 = (apply_mask oct4 Zero bit)}
+ | mask == Twelve = addr { octet2 = (apply_mask oct2 Four bit),
+ octet3 = (apply_mask oct3 Zero bit),
+ octet4 = (apply_mask oct4 Zero bit)}
+ | mask == Eleven = addr { octet2 = (apply_mask oct2 Three bit),
+ octet3 = (apply_mask oct3 Zero bit),
+ octet4 = (apply_mask oct4 Zero bit)}
+ | mask == Ten = addr { octet2 = (apply_mask oct2 Two bit),
+ octet3 = (apply_mask oct3 Zero bit),
+ octet4 = (apply_mask oct4 Zero bit)}
+ | mask == Nine = addr { octet2 = (apply_mask oct2 One bit),
+ octet3 = (apply_mask oct3 Zero bit),
+ octet4 = (apply_mask oct4 Zero bit)}
+ | mask == Eight = addr { octet2 = (apply_mask oct2 Zero bit),
+ octet3 = (apply_mask oct3 Zero bit),
+ octet4 = (apply_mask oct4 Zero bit)}
+ | mask == Seven = addr { octet1 = (apply_mask oct1 Seven bit),
+ octet2 = (apply_mask oct2 Zero bit),
+ octet3 = (apply_mask oct3 Zero bit),
+ octet4 = (apply_mask oct4 Zero bit)}
+ | mask == Six = addr { octet1 = (apply_mask oct1 Six bit),
+ octet2 = (apply_mask oct2 Zero bit),
+ octet3 = (apply_mask oct3 Zero bit),
+ octet4 = (apply_mask oct4 Zero bit)}
+ | mask == Five = addr { octet1 = (apply_mask oct1 Five bit),
+ octet2 = (apply_mask oct2 Zero bit),
+ octet3 = (apply_mask oct3 Zero bit),
+ octet4 = (apply_mask oct4 Zero bit)}
+ | mask == Four = addr { octet1 = (apply_mask oct1 Four bit),
+ octet2 = (apply_mask oct2 Zero bit),
+ octet3 = (apply_mask oct3 Zero bit),
+ octet4 = (apply_mask oct4 Zero bit)}
+ | mask == Three = addr { octet1 = (apply_mask oct1 Three bit),
+ octet2 = (apply_mask oct2 Zero bit),
+ octet3 = (apply_mask oct3 Zero bit),
+ octet4 = (apply_mask oct4 Zero bit)}
+ | mask == Two = addr { octet1 = (apply_mask oct1 Two bit),
+ octet2 = (apply_mask oct2 Zero bit),
+ octet3 = (apply_mask oct3 Zero bit),
+ octet4 = (apply_mask oct4 Zero bit)}
+ | mask == One = addr { octet1 = (apply_mask oct1 One bit),
+ octet2 = (apply_mask oct2 Zero bit),
+ octet3 = (apply_mask oct3 Zero bit),
+ octet4 = (apply_mask oct4 Zero bit)}
+ | mask == Zero = addr { octet1 = (apply_mask oct1 Zero bit),
+ octet2 = (apply_mask oct2 Zero bit),
+ octet3 = (apply_mask oct3 Zero bit),
+ octet4 = (apply_mask oct4 Zero bit)}
+ where
+ oct1 = (octet1 addr)
+ oct2 = (octet2 addr)
+ oct3 = (octet3 addr)
+ oct4 = (octet4 addr)
+
+
+-- | The minimum possible IPv4 address, 0.0.0.0.
+min_address :: IPv4Address
+min_address =
+ IPv4Address min_octet min_octet min_octet min_octet
+
+
+-- | The maximum possible IPv4 address, 255.255.255.255.
+max_address :: IPv4Address
+max_address =
+ IPv4Address max_octet max_octet max_octet max_octet
+
+
+-- | Given two addresses, find the number of the most significant bit
+-- where they differ. If the addresses are the same, return
+-- Maskbits.Zero.