6 most_sig_bit_different,
9 import Data.Maybe (fromJust)
10 import Test.HUnit (assertEqual)
11 import Test.Framework (Test, testGroup)
12 import Test.Framework.Providers.HUnit (testCase)
13 import Test.QuickCheck (Arbitrary(..), Gen)
20 IPv4Address { octet1 :: Octet,
27 instance Show IPv4Address where
28 show addr = concat [(show oct1) ++ ".",
39 instance Arbitrary IPv4Address where
41 oct1 <- arbitrary :: Gen Octet
42 oct2 <- arbitrary :: Gen Octet
43 oct3 <- arbitrary :: Gen Octet
44 oct4 <- arbitrary :: Gen Octet
45 return (IPv4Address oct1 oct2 oct3 oct4)
49 instance Maskable IPv4Address where
51 apply_mask addr mask bit =
59 -- A copy of 'addr' with the fourth octet zeroed (or oned).
60 new_addr1 = addr { octet4 = (apply_mask oct4 Zero bit) }
62 -- Likewise for new_addr1's third octet.
63 new_addr2 = new_addr1 { octet3 = (apply_mask oct3 Zero bit) }
65 -- And new_addr2's second octet.
66 new_addr3 = new_addr2 { octet2 = (apply_mask oct2 Zero bit) }
68 -- This helper function allows us to pattern-match cleanly.
69 apply_mask' :: Maskbits -> IPv4Address
71 apply_mask' ThirtyTwo = addr
73 apply_mask' ThirtyOne = addr { octet4 = (apply_mask oct4 Seven bit) }
76 addr { octet4 = (apply_mask oct4 Six bit) }
78 apply_mask' TwentyNine =
79 addr { octet4 = (apply_mask oct4 Five bit) }
81 apply_mask' TwentyEight =
82 addr { octet4 = (apply_mask oct4 Four bit) }
84 apply_mask' TwentySeven =
85 addr { octet4 = (apply_mask oct4 Three bit) }
87 apply_mask' TwentySix =
88 addr { octet4 = (apply_mask oct4 Two bit) }
90 apply_mask' TwentyFive =
91 addr { octet4 = (apply_mask oct4 One bit) }
93 apply_mask' TwentyFour = new_addr1
95 apply_mask' TwentyThree =
96 new_addr1 { octet3 = (apply_mask oct3 Seven bit) }
98 apply_mask' TwentyTwo =
99 new_addr1 { octet3 = (apply_mask oct3 Six bit) }
101 apply_mask' TwentyOne =
102 new_addr1 { octet3 = (apply_mask oct3 Five bit) }
105 new_addr1 { octet3 = (apply_mask oct3 Four bit) }
107 apply_mask' Nineteen =
108 new_addr1 { octet3 = (apply_mask oct3 Three bit) }
110 apply_mask' Eighteen =
111 new_addr1 { octet3 = (apply_mask oct3 Two bit) }
113 apply_mask' Seventeen =
114 new_addr1 { octet3 = (apply_mask oct3 One bit) }
116 apply_mask' Sixteen =
119 apply_mask' Fifteen =
120 new_addr2 { octet2 = (apply_mask oct2 Seven bit) }
122 apply_mask' Fourteen =
123 new_addr2 { octet2 = (apply_mask oct2 Six bit) }
125 apply_mask' Thirteen =
126 new_addr2 { octet2 = (apply_mask oct2 Five bit) }
129 new_addr2 { octet2 = (apply_mask oct2 Four bit) }
132 new_addr2 { octet2 = (apply_mask oct2 Three bit) }
135 new_addr2 { octet2 = (apply_mask oct2 Two bit) }
138 new_addr2 { octet2 = (apply_mask oct2 One bit) }
141 new_addr3 { octet2 = (apply_mask oct2 Zero bit) }
144 new_addr3 { octet1 = (apply_mask oct1 Seven bit) }
147 new_addr3 { octet1 = (apply_mask oct1 Six bit) }
150 new_addr3 { octet1 = (apply_mask oct1 Five bit) }
153 new_addr3 { octet1 = (apply_mask oct1 Four bit) }
156 new_addr3 { octet1 = (apply_mask oct1 Three bit) }
159 new_addr3 { octet1 = (apply_mask oct1 Two bit) }
162 new_addr3 { octet1 = (apply_mask oct1 One bit) }
165 new_addr3 { octet1 = (apply_mask oct1 Zero bit) }
169 -- | The minimum possible IPv4 address, 0.0.0.0.
170 min_address :: IPv4Address
172 IPv4Address min_octet min_octet min_octet min_octet
175 -- | The maximum possible IPv4 address, 255.255.255.255.
176 max_address :: IPv4Address
178 IPv4Address max_octet max_octet max_octet max_octet
181 -- | Given two addresses, find the number of the most significant bit
182 -- where they differ. If the addresses are the same, return
184 most_sig_bit_different :: IPv4Address -> IPv4Address -> Maskbits
185 most_sig_bit_different addr1 addr2
186 | addr1 == addr2 = Maskbits.Zero
187 | m1 /= n1 = Maskbits.One
197 | m11 /= n11 = Eleven
198 | m12 /= n12 = Twelve
199 | m13 /= n13 = Thirteen
200 | m14 /= n14 = Fourteen
201 | m15 /= n15 = Fifteen
202 | m16 /= n16 = Sixteen
203 | m17 /= n17 = Seventeen
204 | m18 /= n18 = Eighteen
205 | m19 /= n19 = Nineteen
206 | m20 /= n20 = Twenty
207 | m21 /= n21 = TwentyOne
208 | m22 /= n22 = TwentyTwo
209 | m23 /= n23 = TwentyThree
210 | m24 /= n24 = TwentyFour
211 | m25 /= n25 = TwentyFive
212 | m26 /= n26 = TwentySix
213 | m27 /= n27 = TwentySeven
214 | m28 /= n28 = TwentyEight
215 | m29 /= n29 = TwentyNine
216 | m30 /= n30 = Thirty
217 | m31 /= n31 = ThirtyOne
218 | m32 /= n32 = ThirtyTwo
219 | otherwise = Maskbits.Zero
253 oct1a = (octet1 addr1)
254 oct2a = (octet2 addr1)
255 oct3a = (octet3 addr1)
256 oct4a = (octet4 addr1)
289 oct1b = (octet1 addr2)
290 oct2b = (octet2 addr2)
291 oct3b = (octet3 addr2)
292 oct4b = (octet4 addr2)
297 mk_testaddr :: Int -> Int -> Int -> Int -> IPv4Address
298 mk_testaddr a b c d =
299 IPv4Address oct1 oct2 oct3 oct4
301 oct1 = fromJust $ octet_from_int a
302 oct2 = fromJust $ octet_from_int b
303 oct3 = fromJust $ octet_from_int c
304 oct4 = fromJust $ octet_from_int d
307 test_most_sig_bit_different1 :: Test
308 test_most_sig_bit_different1 =
309 testCase desc $ assertEqual desc
313 desc = "10.1.1.0 and 10.1.0.0 differ in bit 24"
314 addr1 = mk_testaddr 10 1 1 0
315 addr2 = (mk_testaddr 10 1 0 0)
316 bit = most_sig_bit_different addr1 addr2
320 test_most_sig_bit_different2 :: Test
321 test_most_sig_bit_different2 =
322 testCase desc $ assertEqual desc
326 desc = "10.1.2.0 and 10.1.1.0 differ in bit 23"
327 addr1 = mk_testaddr 10 1 2 0
328 addr2 = mk_testaddr 10 1 1 0
329 bit = most_sig_bit_different addr1 addr2
332 ipv4address_tests :: Test
334 testGroup "IPv4 Address Tests" [
335 test_most_sig_bit_different1,
336 test_most_sig_bit_different2 ]