-module Maskable where
+module Maskable (
+ Maskable(..) )
+where
-import qualified Bit as B
-import IPv4Address
-import Maskbits
-import Octet
+import Bit (Bit)
+import Maskbits (Maskbits)
--- Any string of bits should be maskable by some number of netmask
--- bits. The convention of the Maskable typeclass follows CIDR
--- notation, where the number of mask bits (the number after the
--- slash) denotes how many bits are reserved for the network.
+-- | Any string of bits should be maskable by some number of netmask
+-- bits. The convention of the Maskable typeclass follows CIDR
+-- notation, where the number of mask bits (the number after the
+-- slash) denotes how many bits are reserved for the network.
+--
+-- So, a mask of 32 applied to an address of 127.0.0.1 will again
+-- return 127.0.0.1. Likewise, 31 mask bits applied to 127.0.0.1
+-- should return 127.0.0.0, since 127.0.0.1/31 matches both
+-- 127.0.0.0 and 127.0.0.1. In this case, the final '0' or '1' is
+-- the host part of the address. The '127.0.0' is thus the network
+-- part.
+--
+-- The Bit argument allows us to specify whether the host bits
+-- should be replaced with either Zero or One.
--
--- So, a mask of 32 applied to an address of 127.0.0.1 will again
--- return 127.0.0.1. Likewise, 31 mask bits applied to 127.0.0.1
--- should return 127.0.0.0, since 127.0.0.1/31 matches both 127.0.0.0
--- and 127.0.0.1. In this case, the final '0' or '1' is the host
--- part of the address. The '127.0.0' is thus the network part.
class Maskable a where
- apply_mask :: a -> Maskbits -> a
-
-
-instance Maskable Octet where
- apply_mask _ Maskbits.None = Octet.None
- apply_mask Octet.None _ = Octet.None
- apply_mask oct mask
- | mask == Eight = oct
- | mask == Seven = oct { b8 = B.Zero }
- | mask == Six = oct { b8 = B.Zero, b7 = B.Zero }
- | mask == Five = oct { b8 = B.Zero, b7 = B.Zero, b6 = B.Zero }
- | mask == Four = oct { b8 = B.Zero, b7 = B.Zero, b6 = B.Zero, b5 = B.Zero }
- | mask == Three = oct { b8 = B.Zero, b7 = B.Zero, b6 = B.Zero, b5 = B.Zero, b4 = B.Zero }
- | mask == Two = oct { b8 = B.Zero, b7 = B.Zero, b6 = B.Zero, b5 = B.Zero, b4 = B.Zero, b3 = B.Zero }
- | mask == One = oct { b8 = B.Zero, b7 = B.Zero, b6 = B.Zero, b5 = B.Zero, b4 = B.Zero, b3 = B.Zero, b2 = B.Zero }
- | mask == Zero = min_octet
- | otherwise = Octet.None
-
-
-
-instance Maskable IPv4Address where
- 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 One)
- | mask == Thirty = ipv4address_from_octets oct1 oct2 oct3 (apply_mask oct4 Two)
- | mask == TwentyNine = ipv4address_from_octets oct1 oct2 oct3 (apply_mask oct4 Three)
- | mask == TwentyEight = ipv4address_from_octets oct1 oct2 oct3 (apply_mask oct4 Four)
- | mask == TwentySeven = ipv4address_from_octets oct1 oct2 oct3 (apply_mask oct4 Five)
- | mask == TwentySix = ipv4address_from_octets oct1 oct2 oct3 (apply_mask oct4 Six)
- | mask == TwentyFive = ipv4address_from_octets oct1 oct2 oct3 (apply_mask oct4 Seven)
- | mask == TwentyFour = ipv4address_from_octets oct1 oct2 oct3 (min_octet)
- | mask == TwentyThree = ipv4address_from_octets oct1 oct2 (apply_mask oct3 One) (min_octet)
- | mask == TwentyTwo = ipv4address_from_octets oct1 oct2 (apply_mask oct3 Two) (min_octet)
- | mask == TwentyOne = ipv4address_from_octets oct1 oct2 (apply_mask oct3 Three) (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 Five) (min_octet)
- | mask == Eighteen = ipv4address_from_octets oct1 oct2 (apply_mask oct3 Six) (min_octet)
- | mask == Seventeen = ipv4address_from_octets oct1 oct2 (apply_mask oct3 Seven) (min_octet)
- | mask == Sixteen = ipv4address_from_octets oct1 oct2 (min_octet) (min_octet)
- | mask == Fifteen = ipv4address_from_octets oct1 (apply_mask oct2 One) (min_octet) (min_octet)
- | mask == Fourteen = ipv4address_from_octets oct1 (apply_mask oct2 Two) (min_octet) (min_octet)
- | mask == Thirteen = ipv4address_from_octets oct1 (apply_mask oct2 Three) (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 Five) (min_octet) (min_octet)
- | mask == Ten = ipv4address_from_octets oct1 (apply_mask oct2 Six) (min_octet) (min_octet)
- | mask == Nine = ipv4address_from_octets oct1 (apply_mask oct2 Seven) (min_octet) (min_octet)
- | mask == Eight = ipv4address_from_octets oct1 (min_octet) (min_octet) (min_octet)
- | mask == Seven = ipv4address_from_octets (apply_mask oct1 One) (min_octet) (min_octet) (min_octet)
- | mask == Six = ipv4address_from_octets (apply_mask oct1 Two) (min_octet) (min_octet) (min_octet)
- | mask == Five = ipv4address_from_octets (apply_mask oct1 Three) (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 Five) (min_octet) (min_octet) (min_octet)
- | mask == Two = ipv4address_from_octets (apply_mask oct1 Six) (min_octet) (min_octet) (min_octet)
- | mask == One = ipv4address_from_octets (apply_mask oct1 Seven) (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)
+ apply_mask :: a -> Maskbits -> Bit -> a
projects / hath.git / blobdiff