X-Git-Url: http://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=src%2FMaskable.hs;h=d05ff6ffbaf63b9695206f596bdd1bc154afc1e4;hb=7622c66d1bb0592ae6cd5b9c6092ff2e0490c4a1;hp=a0f0764e80f281a794a2387fa7272c99a854afae;hpb=fbd4a98a9a0996d41e3715a2698114b8a061f2cd;p=hath.git diff --git a/src/Maskable.hs b/src/Maskable.hs index a0f0764..d05ff6f 100644 --- a/src/Maskable.hs +++ b/src/Maskable.hs @@ -1,79 +1,22 @@ module Maskable where import Bit -import IPv4Address import Maskbits -import Octet --- 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 oct (Maskbits maskbits) - | maskbits == 8 = oct - | maskbits == 7 = oct { b8 = Zero } - | maskbits == 6 = oct { b8 = Zero, b7 = Zero } - | maskbits == 5 = oct { b8 = Zero, b7 = Zero, b6 = Zero } - | maskbits == 4 = oct { b8 = Zero, b7 = Zero, b6 = Zero, b5 = Zero } - | maskbits == 3 = oct { b8 = Zero, b7 = Zero, b6 = Zero, b5 = Zero, b4 = Zero } - | maskbits == 2 = oct { b8 = Zero, b7 = Zero, b6 = Zero, b5 = Zero, b4 = Zero, b3 = Zero } - | maskbits == 1 = oct { b8 = Zero, b7 = Zero, b6 = Zero, b5 = Zero, b4 = Zero, b3 = Zero, b2 = Zero } - | maskbits == 0 = min_octet - | otherwise = Octet.None - - - -instance Maskable IPv4Address where - apply_mask _ Maskbits.None = IPv4Address.None - apply_mask addr (Maskbits mask) - | mask == 32 = ipv4address_from_octets oct1 oct2 oct3 oct4 - | mask == 31 = ipv4address_from_octets oct1 oct2 oct3 (apply_mask oct4 (Maskbits 1)) - | mask == 30 = ipv4address_from_octets oct1 oct2 oct3 (apply_mask oct4 (Maskbits 2)) - | mask == 29 = ipv4address_from_octets oct1 oct2 oct3 (apply_mask oct4 (Maskbits 3)) - | mask == 28 = ipv4address_from_octets oct1 oct2 oct3 (apply_mask oct4 (Maskbits 4)) - | mask == 27 = ipv4address_from_octets oct1 oct2 oct3 (apply_mask oct4 (Maskbits 5)) - | mask == 26 = ipv4address_from_octets oct1 oct2 oct3 (apply_mask oct4 (Maskbits 6)) - | mask == 25 = ipv4address_from_octets oct1 oct2 oct3 (apply_mask oct4 (Maskbits 7)) - | mask == 24 = ipv4address_from_octets oct1 oct2 oct3 (min_octet) - | mask == 23 = ipv4address_from_octets oct1 oct2 (apply_mask oct3 (Maskbits 1)) (min_octet) - | mask == 22 = ipv4address_from_octets oct1 oct2 (apply_mask oct3 (Maskbits 2)) (min_octet) - | mask == 21 = ipv4address_from_octets oct1 oct2 (apply_mask oct3 (Maskbits 3)) (min_octet) - | mask == 20 = ipv4address_from_octets oct1 oct2 (apply_mask oct3 (Maskbits 4)) (min_octet) - | mask == 19 = ipv4address_from_octets oct1 oct2 (apply_mask oct3 (Maskbits 5)) (min_octet) - | mask == 18 = ipv4address_from_octets oct1 oct2 (apply_mask oct3 (Maskbits 6)) (min_octet) - | mask == 17 = ipv4address_from_octets oct1 oct2 (apply_mask oct3 (Maskbits 7)) (min_octet) - | mask == 16 = ipv4address_from_octets oct1 oct2 (min_octet) (min_octet) - | mask == 15 = ipv4address_from_octets oct1 (apply_mask oct2 (Maskbits 1)) (min_octet) (min_octet) - | mask == 14 = ipv4address_from_octets oct1 (apply_mask oct2 (Maskbits 2)) (min_octet) (min_octet) - | mask == 13 = ipv4address_from_octets oct1 (apply_mask oct2 (Maskbits 3)) (min_octet) (min_octet) - | mask == 12 = ipv4address_from_octets oct1 (apply_mask oct2 (Maskbits 4)) (min_octet) (min_octet) - | mask == 11 = ipv4address_from_octets oct1 (apply_mask oct2 (Maskbits 5)) (min_octet) (min_octet) - | mask == 10 = ipv4address_from_octets oct1 (apply_mask oct2 (Maskbits 6)) (min_octet) (min_octet) - | mask == 9 = ipv4address_from_octets oct1 (apply_mask oct2 (Maskbits 7)) (min_octet) (min_octet) - | mask == 8 = ipv4address_from_octets oct1 (min_octet) (min_octet) (min_octet) - | mask == 7 = ipv4address_from_octets (apply_mask oct1 (Maskbits 1)) (min_octet) (min_octet) (min_octet) - | mask == 6 = ipv4address_from_octets (apply_mask oct1 (Maskbits 2)) (min_octet) (min_octet) (min_octet) - | mask == 5 = ipv4address_from_octets (apply_mask oct1 (Maskbits 3)) (min_octet) (min_octet) (min_octet) - | mask == 4 = ipv4address_from_octets (apply_mask oct1 (Maskbits 4)) (min_octet) (min_octet) (min_octet) - | mask == 3 = ipv4address_from_octets (apply_mask oct1 (Maskbits 5)) (min_octet) (min_octet) (min_octet) - | mask == 2 = ipv4address_from_octets (apply_mask oct1 (Maskbits 6)) (min_octet) (min_octet) (min_octet) - | mask == 1 = ipv4address_from_octets (apply_mask oct1 (Maskbits 7)) (min_octet) (min_octet) (min_octet) - | mask == 0 = 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