-module IPv4Address
-( ipv4address_tests,
+module IPv4Address(
IPv4Address(..),
- max_address,
- min_address,
- most_sig_bit_different,
-) where
+ ipv4address_properties,
+ ipv4address_tests,
+ most_sig_bit_different )
+where
-import Data.Maybe (fromJust)
-import Test.HUnit (assertEqual)
-import Test.Framework (Test, testGroup)
-import Test.Framework.Providers.HUnit (testCase)
-import Test.QuickCheck (Arbitrary(..), Gen)
-import Maskable
-import Maskbits
-import Octet
+import Test.QuickCheck ( Gen ) -- Not re-exported by tasty
+import Test.Tasty ( TestTree, testGroup )
+import Test.Tasty.HUnit ( (@?=), testCase )
+import Test.Tasty.QuickCheck (
+ Arbitrary(..),
+ Property,
+ (==>),
+ testProperty )
+
+import Maskable (Maskable(..))
+import Maskbits (Maskbits(..))
+import Octet (Octet(..))
data IPv4Address =
IPv4Address { octet1 :: Octet,
new_addr3 { octet1 = (apply_mask oct1 Zero bit) }
-
--- | 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
-
+instance Bounded IPv4Address where
+ -- | The minimum possible IPv4 address, 0.0.0.0.
+ minBound = IPv4Address minBound minBound minBound minBound
+
+ -- | The maximum possible IPv4 address, 255.255.255.255.
+ maxBound = IPv4Address maxBound maxBound maxBound maxBound
+
+
+
+
+instance Enum IPv4Address where
+ -- | Convert an 'Int' @x@ to an 'IPv4Address'. Each octet of @x@ is
+ -- right-shifted by the appropriate number of bits, and the fractional
+ -- part is dropped.
+ toEnum x =
+ IPv4Address oct1 oct2 oct3 oct4
+ where
+ -- Chop off the higher octets. x1 = x `mod` 2^32, would be
+ -- redundant.
+ x2 = x `mod` 2^(24 :: Integer)
+ x3 = x `mod` 2^(16 :: Integer)
+ x4 = x `mod` 2^(8 :: Integer)
+ -- Perform right-shifts. x4 doesn't need a shift.
+ shifted_x1 = x `quot` 2^(24 :: Integer)
+ shifted_x2 = x2 `quot` 2^(16 :: Integer)
+ shifted_x3 = x3 `quot` 2^(8 :: Integer)
+ oct1 = toEnum shifted_x1
+ oct2 = toEnum shifted_x2
+ oct3 = toEnum shifted_x3
+ oct4 = toEnum x4
+
+ -- | Convert @addr@ to an 'Int' by converting each octet to an 'Int'
+ -- and shifting the result to the left by 0,8.16, or 24 bits.
+ fromEnum addr =
+ (shifted_oct1) + (shifted_oct2) + (shifted_oct3) + oct4
+ where
+ oct1 = fromEnum (octet1 addr)
+ oct2 = fromEnum (octet2 addr)
+ oct3 = fromEnum (octet3 addr)
+ oct4 = fromEnum (octet4 addr)
+ shifted_oct1 = oct1 * 2^(24 :: Integer)
+ shifted_oct2 = oct2 * 2^(16 :: Integer)
+ shifted_oct3 = oct3 * 2^(8 :: Integer)
-- | Given two addresses, find the number of the most significant bit
-- where they differ. If the addresses are the same, return
oct4b = (octet4 addr2)
+-- Test lists.
+ipv4address_tests :: TestTree
+ipv4address_tests =
+ testGroup "IPv4 Address Tests" [
+ test_enum,
+ test_maxBound,
+ test_minBound,
+ test_most_sig_bit_different1,
+ test_most_sig_bit_different2,
+ test_to_enum ]
+
+ipv4address_properties :: TestTree
+ipv4address_properties =
+ testGroup
+ "IPv4 Address Properties "
+ [ prop_from_enum_to_enum_inverses ]
+
+-- QuickCheck properties
+prop_from_enum_to_enum_inverses :: TestTree
+prop_from_enum_to_enum_inverses =
+ testProperty "fromEnum and toEnum are inverses" prop
+ where
+ prop :: Int -> Property
+ prop x =
+ (0 <= x) && (x <= 2^(32 :: Integer) - 1) ==>
+ fromEnum (toEnum x :: IPv4Address) == x
-- HUnit Tests
mk_testaddr :: Int -> Int -> Int -> Int -> IPv4Address
mk_testaddr a b c d =
IPv4Address oct1 oct2 oct3 oct4
where
- oct1 = fromJust $ octet_from_int a
- oct2 = fromJust $ octet_from_int b
- oct3 = fromJust $ octet_from_int c
- oct4 = fromJust $ octet_from_int d
+ oct1 = toEnum a
+ oct2 = toEnum b
+ oct3 = toEnum c
+ oct4 = toEnum d
+
+
+test_minBound :: TestTree
+test_minBound =
+ testCase desc $ actual @?= expected
+ where
+ desc = "minBound should be 0.0.0.0"
+ expected = mk_testaddr 0 0 0 0
+ actual = minBound :: IPv4Address
+
+
+test_maxBound :: TestTree
+test_maxBound =
+ testCase desc $ actual @?= expected
+ where
+ desc = "maxBound should be 255.255.255.255"
+ expected = mk_testaddr 255 255 255 255
+ actual = maxBound :: IPv4Address
+
+test_enum :: TestTree
+test_enum =
+ testCase desc $ actual @?= expected
+ where
+ desc = "enumerating a /24 gives the correct addresses"
+ expected = ["192.168.0." ++ (show x) | x <- [0..255::Int] ]
+ lb = mk_testaddr 192 168 0 0
+ ub = mk_testaddr 192 168 0 255
+ actual = map show [lb..ub]
-test_most_sig_bit_different1 :: Test
+
+test_most_sig_bit_different1 :: TestTree
test_most_sig_bit_different1 =
- testCase desc $ assertEqual desc
- TwentyFour
- bit
+ testCase desc $ actual @?= expected
where
desc = "10.1.1.0 and 10.1.0.0 differ in bit 24"
addr1 = mk_testaddr 10 1 1 0
addr2 = (mk_testaddr 10 1 0 0)
- bit = most_sig_bit_different addr1 addr2
+ expected = TwentyFour
+ actual = most_sig_bit_different addr1 addr2
-test_most_sig_bit_different2 :: Test
+test_most_sig_bit_different2 :: TestTree
test_most_sig_bit_different2 =
- testCase desc $ assertEqual desc
- TwentyThree
- bit
+ testCase desc $ actual @?= expected
where
desc = "10.1.2.0 and 10.1.1.0 differ in bit 23"
addr1 = mk_testaddr 10 1 2 0
addr2 = mk_testaddr 10 1 1 0
- bit = most_sig_bit_different addr1 addr2
+ expected = TwentyThree
+ actual = most_sig_bit_different addr1 addr2
-ipv4address_tests :: Test
-ipv4address_tests =
- testGroup "IPv4 Address Tests" [
- test_most_sig_bit_different1,
- test_most_sig_bit_different2 ]
+test_to_enum :: TestTree
+test_to_enum =
+ testCase desc $ actual @?= expected
+ where
+ desc = "192.168.0.0 in base-10 is 3232235520"
+ expected = mk_testaddr 192 168 0 0
+ actual = toEnum 3232235520
projects / hath.git / blobdiff