@@ -1,85 +1,86 @@
1−{-# LANGUAGE DeriveDataTypeable, TypeFamilies, CPP #-}
1+{-# LANGUAGE CPP #-}
2+{-# LANGUAGE DeriveDataTypeable #-}
3+{-# LANGUAGE TypeFamilies #-}
4+{-# LANGUAGE ViewPatterns #-}
5+{-# LANGUAGE Unsafe #-}
6+{-# LANGUAGE DeriveLift #-}
7+{-# LANGUAGE StandaloneDeriving #-}
8+{-# OPTIONS_HADDOCK hide #-}
29
310-- |
4−-- Module : Data.UUID
5−-- Copyright : (c) 2008-2009, 2012 Antoine Latter
11+-- Module : Data.UUID.Types.Internal
12+-- Copyright : (c) 2017-2018 Herbert Valerio Riedel
13+-- (c) 2008-2009, 2012 Antoine Latter
614-- (c) 2009 Mark Lentczner
715--
816-- License : BSD-style
917--
10−-- Maintainer : aslatter@gmail.com
11−-- Stability : experimental
18+-- Maintainer : hvr@gnu.org
1219-- Portability : portable
1320
14−module Data.UUID.Internal
15− (UUID(..)
16− ,null
17− ,nil
18− ,fromByteString
19− ,toByteString
20− ,fromString
21− ,toString
22− ,fromWords
23− ,toWords
24− ,toList
25− ,buildFromBytes
26− ,buildFromWords
27− ,fromASCIIBytes
28− ,toASCIIBytes
29− ,fromLazyASCIIBytes
30− ,toLazyASCIIBytes
31− ,UnpackedUUID(..)
32− ,pack
33− ,unpack
21+module Data.UUID.Types.Internal
22+ ( UUID(..)
23+ , null
24+ , nil
25+ , fromByteString
26+ , toByteString
27+ , fromString
28+ , toString
29+ , fromText
30+ , toText
31+ , fromWords
32+ , toWords
33+ , fromWords64
34+ , toWords64
35+ , toList
36+ , buildFromBytes
37+ , buildFromWords
38+ , fromASCIIBytes
39+ , toASCIIBytes
40+ , fromLazyASCIIBytes
41+ , toLazyASCIIBytes
42+ , UnpackedUUID(..)
43+ , pack
44+ , unpack
3445 ) where
3546
36−import Prelude hiding (null)
37−
38−import Control.Applicative ((<*>))
39−import Control.DeepSeq (NFData(..))
40−import Control.Monad (liftM4, guard)
41−import Data.Functor ((<$>))
42−import Data.Char
43−import Data.Bits
44−import Data.Hashable
45−import Data.Maybe
46−import Data.List (elemIndices)
47−import Foreign.Ptr (Ptr)
48−
49−#if MIN_VERSION_base(4,0,0)
50−import Data.Data
51−#else
52−import Data.Generics.Basics
53−#endif
54−
55−import Foreign.Storable
56−
57−import Data.Binary
58−import Data.Binary.Put
59−import Data.Binary.Get
60−import qualified Data.ByteString as B
61−import qualified Data.ByteString.Internal as BI
62−import qualified Data.ByteString.Lazy as BL
63−import qualified Data.ByteString.Unsafe as BU
64−
65−import Data.UUID.Builder
66−import Data.Word.Util
67−
68−import System.Random
69−
70−
71−-- |The UUID type. A 'Random' instance is provided which produces
72−-- version 4 UUIDs as specified in RFC 4122. The 'Storable' and
73−-- 'Binary' instances are compatible with RFC 4122, storing the fields
74−-- in network order as 16 bytes.
75−data UUID
76− = UUID
77− {-# UNPACK #-} !Word32
78− {-# UNPACK #-} !Word32
79− {-# UNPACK #-} !Word32
80− {-# UNPACK #-} !Word32
81− deriving (Eq, Ord, Typeable)
47+import Prelude hiding (null)
48+
49+import Control.DeepSeq (NFData (..))
50+import Control.Monad (guard, liftM2)
51+import Data.Bits
52+import Data.Char
53+import Data.Data
54+import Data.Hashable
55+import Data.List (elemIndices)
56+import Foreign.Ptr (Ptr)
57+
58+import Foreign.Storable
59+
60+import Data.Binary
61+import Data.Binary.Get
62+import Data.Binary.Put
63+import qualified Data.ByteString as B
64+import qualified Data.ByteString.Internal as BI
65+import qualified Data.ByteString.Lazy as BL
66+import qualified Data.ByteString.Unsafe as BU
67+import Data.Text (Text)
68+import qualified Data.Text.Encoding as T
69+
70+import Data.UUID.Types.Internal.Builder
71+
72+import System.Random (Random (..), uniform)
73+import System.Random.Stateful (Uniform (..), uniformWord64)
74+
75+import Language.Haskell.TH.Syntax (Lift)
76+
77+-- | Type representing <https://en.wikipedia.org/wiki/UUID Universally Unique Identifiers (UUID)> as specified in
78+-- <http://tools.ietf.org/html/rfc4122 RFC 4122>.
79+data UUID = UUID {-# UNPACK #-} !Word64 {-# UNPACK #-} !Word64
80+ deriving (Eq, Ord)
8281{-
82+ Prior to uuid-types-1.0.4:
83+ !Word32 !Word32 !Word32 !Word32
8384 Other representations that we tried are:
8485 Mimic V1 structure: !Word32 !Word16 !Word16 !Word16
8586 !Word8 !Word8 !Word8 !Word8 !Word8 !Word8
@@ -91,40 +92,75 @@ data UUID
9192 None was as fast, overall, as the representation used here.
9293-}
9394
94−-- | Covert a 'UUID' into a sequence of 'Word32' values.
95−-- Usefull for when you need to serialize a UUID and
95+-- | Convert a 'UUID' into a sequence of 'Word32' values.
96+-- Useful for when you need to serialize a UUID and
9697-- neither 'Storable' nor 'Binary' are appropriate.
97−-- Introduced in version 1.2.2.
98+--
99+-- >>> toWords <$> fromString "550e8400-e29b-41d4-a716-446655440000"
100+-- Just (1427014656,3801825748,2803254374,1430519808)
101+--
102+-- See also 'toWords64'.
103+--
104+-- /Since: @uuid-1.2.2@/
105+--
106+-- @since 1.0.0
98107toWords :: UUID -> (Word32, Word32, Word32, Word32)
99−toWords (UUID w1 w2 w3 w4) = (w1, w2, w3, w4)
108+toWords (UUID w12 w34) = (w1, w2, w3, w4)
109+ where
110+ w1 = fromIntegral (w12 `unsafeShiftR` 32)
111+ w2 = fromIntegral w12
112+ w3 = fromIntegral (w34 `unsafeShiftR` 32)
113+ w4 = fromIntegral w34
100114
101115-- | Create a 'UUID' from a sequence of 'Word32'. The
102−-- opposite of 'toWords'. Useful when you need a total
116+-- inverse of 'toWords'. Useful when you need a total
103117-- function for constructing 'UUID' values.
104−-- Introduced in version 1.2.2.
118+--
119+-- See also 'fromWords64'.
120+--
121+-- /Since: @uuid-1.2.2@/
122+--
123+-- @since 1.0.0
105124fromWords :: Word32 -> Word32 -> Word32 -> Word32 -> UUID
106−fromWords = UUID
125+fromWords w1 w2 w3 w4 = UUID (w32to64 w1 w2) (w32to64 w3 w4)
126+
127+-- | Convert a 'UUID' into a pair of 'Word64's.
128+--
129+-- >>> toWords64 <$> fromString "550e8400-e29b-41d4-a716-446655440000"
130+-- Just (6128981282234515924,12039885860129472512)
131+--
132+-- See also 'toWords'.
133+--
134+-- @since 1.0.4
135+toWords64 :: UUID -> (Word64, Word64)
136+toWords64 (UUID w12 w34) = (w12,w34)
137+
138+-- | Create a 'UUID' from a pair of 'Word64's.
139+--
140+-- Inverse of 'toWords64'. See also 'fromWords'.
141+--
142+-- @since 1.0.4
143+fromWords64 :: Word64 -> Word64 -> UUID
144+fromWords64 = UUID
107145
108146data UnpackedUUID =
109147 UnpackedUUID {
110− time_low :: Word32 -- 0-3
111− , time_mid :: Word16 -- 4-5
148+ time_low :: Word32 -- 0-3
149+ , time_mid :: Word16 -- 4-5
112150 , time_hi_and_version :: Word16 -- 6-7
113− , clock_seq_hi_res :: Word8 -- 8
114− , clock_seq_low :: Word8 -- 9
115− , node_0 :: Word8
116− , node_1 :: Word8
117− , node_2 :: Word8
118− , node_3 :: Word8
119− , node_4 :: Word8
120− , node_5 :: Word8
151+ , clock_seq_hi_res :: Word8 -- 8
152+ , clock_seq_low :: Word8 -- 9
153+ , node_0 :: Word8
154+ , node_1 :: Word8
155+ , node_2 :: Word8
156+ , node_3 :: Word8
157+ , node_4 :: Word8
158+ , node_5 :: Word8
121159 }
122160 deriving (Read, Show, Eq, Ord)
123161
124162unpack :: UUID -> UnpackedUUID
125−unpack (UUID w0 w1 w2 w3) =
126− build /-/ w0 /-/ w1 /-/ w2 /-/ w3
127−
163+unpack (UUID w0 w1) = build /-/ w0 /-/ w1
128164 where
129165 build x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF =
130166 UnpackedUUID {
@@ -143,13 +179,13 @@ unpack (UUID w0 w1 w2 w3) =
143179
144180pack :: UnpackedUUID -> UUID
145181pack unpacked =
146− makeFromBytes /-/ (time_low unpacked)
147− /-/ (time_mid unpacked)
148− /-/ (time_hi_and_version unpacked)
149− /-/ (clock_seq_hi_res unpacked)
182+ makeFromBytes /-/ (time_low unpacked)
183+ /-/ (time_mid unpacked)
184+ /-/ (time_hi_and_version unpacked)
185+ /-/ (clock_seq_hi_res unpacked)
150186 /-/ (clock_seq_low unpacked)
151− /-/ (node_0 unpacked) /-/ (node_1 unpacked)
152− /-/ (node_2 unpacked) /-/ (node_3 unpacked)
187+ /-/ (node_0 unpacked) /-/ (node_1 unpacked)
188+ /-/ (node_2 unpacked) /-/ (node_3 unpacked)
153189 /-/ (node_4 unpacked) /-/ (node_5 unpacked)
154190
155191
@@ -159,15 +195,26 @@ pack unpacked =
159195
160196-- |Build a Word32 from four Word8 values, presented in big-endian order
161197word :: Word8 -> Word8 -> Word8 -> Word8 -> Word32
162−word a b c d = (fromIntegral a `shiftL` 24)
163− .|. (fromIntegral b `shiftL` 16)
164− .|. (fromIntegral c `shiftL` 8)
165− .|. (fromIntegral d )
198+word a b c d = (fromIntegral a `unsafeShiftL` 24)
199+ .|. (fromIntegral b `unsafeShiftL` 16)
200+ .|. (fromIntegral c `unsafeShiftL` 8)
201+ .|. (fromIntegral d )
166202
167−-- |Extract a Word8 from a Word32. Bytes, high to low, are numbered from 3 to 0,
168−byte :: Int -> Word32 -> Word8
203+-- |Extract a Word8 from a Word64. Bytes, high to low, are numbered from 7 to 0,
204+byte :: Int -> Word64 -> Word8
169205byte i w = fromIntegral (w `shiftR` (i * 8))
170206
207+-- |Build a Word16 from two Word8 values, presented in big-endian order.
208+w8to16 :: Word8 -> Word8 -> Word16
209+w8to16 w0s w1s =
210+ (w0 `unsafeShiftL` 8) .|. w1
211+ where
212+ w0 = fromIntegral w0s
213+ w1 = fromIntegral w1s
214+
215+-- | Construct 'Word64' from low/high 'Word32's
216+w32to64 :: Word32 -> Word32 -> Word64
217+w32to64 w0 w1 = (fromIntegral w0 `unsafeShiftL` 32) .|. (fromIntegral w1)
171218
172219-- |Make a UUID from sixteen Word8 values
173220makeFromBytes :: Word8 -> Word8 -> Word8 -> Word8
@@ -176,16 +223,12 @@ makeFromBytes :: Word8 -> Word8 -> Word8 -> Word8
176223 -> Word8 -> Word8 -> Word8 -> Word8
177224 -> UUID
178225makeFromBytes b0 b1 b2 b3 b4 b5 b6 b7 b8 b9 ba bb bc bd be bf
179− = UUID w0 w1 w2 w3
226+ = fromWords w0 w1 w2 w3
180227 where w0 = word b0 b1 b2 b3
181228 w1 = word b4 b5 b6 b7
182229 w2 = word b8 b9 ba bb
183230 w3 = word bc bd be bf
184231
185−-- |Make a UUID from four Word32 values
186−makeFromWords :: Word32 -> Word32 -> Word32 -> Word32 -> UUID
187−makeFromWords = UUID
188−
189232-- |A Builder for constructing a UUID of a given version.
190233buildFromBytes :: Word8
191234 -> Word8 -> Word8 -> Word8 -> Word8
@@ -198,20 +241,20 @@ buildFromBytes v b0 b1 b2 b3 b4 b5 b6 b7 b8 b9 ba bb bc bd be bf =
198241 where b6' = b6 .&. 0x0f .|. (v `shiftL` 4)
199242 b8' = b8 .&. 0x3f .|. 0x80
200243
201−-- |Build a UUID of a given version from Word32 values.
244+-- |Build a UUID of a given version from 'Word32' values.
202245buildFromWords :: Word8 -> Word32 -> Word32 -> Word32 -> Word32 -> UUID
203−buildFromWords v w0 w1 w2 w3 = makeFromWords w0 w1' w2' w3
246+buildFromWords v w0 w1 w2 w3 = fromWords w0 w1' w2' w3
204247 where w1' = w1 .&. 0xffff0fff .|. ((fromIntegral v) `shiftL` 12)
205248 w2' = w2 .&. 0x3fffffff .|. 0x80000000
206249
207250
208251-- |Return the bytes that make up the UUID
209252toList :: UUID -> [Word8]
210−toList (UUID w0 w1 w2 w3) =
211− [byte 3 w0, byte 2 w0, byte 1 w0, byte 0 w0,
212− byte 3 w1, byte 2 w1, byte 1 w1, byte 0 w1,
213− byte 3 w2, byte 2 w2, byte 1 w2, byte 0 w2,
214− byte 3 w3, byte 2 w3, byte 1 w3, byte 0 w3]
253+toList (UUID w0 w1) =
254+ [byte 7 w0, byte 6 w0, byte 5 w0, byte 4 w0,
255+ byte 3 w0, byte 2 w0, byte 1 w0, byte 0 w0,
256+ byte 7 w1, byte 6 w1, byte 5 w1, byte 4 w1,
257+ byte 3 w1, byte 2 w1, byte 1 w1, byte 0 w1]
215258
216259-- |Construct a UUID from a list of Word8. Returns Nothing if the list isn't
217260-- exactly sixteen bytes long
@@ -232,10 +275,10 @@ null = (== nil)
232275 -- null (UUID 0 0 0 0) = True
233276 -- null _ = False
234277
235−-- |The nil UUID, as defined in RFC 4122.
236−-- It is a UUID of all zeros. @'null' u@ iff @'u' == 'nil'@.
278+-- |The 'nil' UUID, as defined in <http://tools.ietf.org/html/rfc4122 RFC 4122>.
279+-- It is a UUID of all zeros. @'null' u@ /iff/ @'u' == 'nil'@.
237280nil :: UUID
238−nil = UUID 0 0 0 0
281+nil = UUID 0 0
239282
240283-- |Extract a UUID from a 'ByteString' in network byte order.
241284-- The argument must be 16 bytes long, otherwise 'Nothing' is returned.
@@ -243,6 +286,8 @@ fromByteString :: BL.ByteString -> Maybe UUID
243286fromByteString = fromList . BL.unpack
244287
245288-- |Encode a UUID into a 'ByteString' in network order.
289+--
290+-- This uses the same encoding as the 'Binary' instance.
246291toByteString :: UUID -> BL.ByteString
247292toByteString = BL.pack . toList
248293
@@ -250,9 +295,8 @@ toByteString = BL.pack . toList
250295-- The hyphens may not be omitted.
251296-- Example:
252297--
253−-- @
254−-- fromString \"c2cc10e1-57d6-4b6f-9899-38d972112d8c\"
255−-- @
298+-- >>> fromString "c2cc10e1-57d6-4b6f-9899-38d972112d8c"
299+-- Just c2cc10e1-57d6-4b6f-9899-38d972112d8c
256300--
257301-- Hex digits may be upper or lower-case.
258302fromString :: String -> Maybe UUID
@@ -267,7 +311,7 @@ fromString' s0 = do
267311 (w2, s3) <- hexWord s2
268312 (w3, s4) <- hexWord s3
269313 if s4 /= "" then Nothing
270− else Just $ UUID w0 w1 w2 w3
314+ else Just $ fromWords w0 w1 w2 w3
271315 where hexWord :: String -> Maybe (Word32, String)
272316 hexWord s = Just (0, s) >>= hexByte >>= hexByte
273317 >>= hexByte >>= hexByte
@@ -284,21 +328,39 @@ fromString' s0 = do
284328-- | Convert a UUID into a hypenated string using lower-case letters.
285329-- Example:
286330--
287−-- @
288−-- toString \<$\> fromString \"550e8400-e29b-41d4-a716-446655440000\"
289−-- @
331+-- >>> toString <$> fromString "550e8400-e29b-41d4-a716-446655440000"
332+-- Just "550e8400-e29b-41d4-a716-446655440000"
333+--
334+--
290335toString :: UUID -> String
291−toString (UUID w0 w1 w2 w3) = hexw w0 $ hexw' w1 $ hexw' w2 $ hexw w3 ""
292− where hexw :: Word32 -> String -> String
293− hexw w s = hexn w 28 : hexn w 24 : hexn w 20 : hexn w 16
294− : hexn w 12 : hexn w 8 : hexn w 4 : hexn w 0 : s
336+toString uuid = hexw0 w0 $ hexw1 w1 ""
337+ where hexw0 :: Word64 -> String -> String
338+ hexw0 w s = hexn w 60 : hexn w 56 : hexn w 52 : hexn w 48
339+ : hexn w 44 : hexn w 40 : hexn w 36 : hexn w 32
340+ : '-' : hexn w 28 : hexn w 24 : hexn w 20 : hexn w 16
341+ : '-' : hexn w 12 : hexn w 8 : hexn w 4 : hexn w 0
342+ : s
343+
344+ hexw1 :: Word64 -> String -> String
345+ hexw1 w s = '-' : hexn w 60 : hexn w 56 : hexn w 52 : hexn w 48
346+ : '-' : hexn w 44 : hexn w 40 : hexn w 36 : hexn w 32
347+ : hexn w 28 : hexn w 24 : hexn w 20 : hexn w 16
348+ : hexn w 12 : hexn w 8 : hexn w 4 : hexn w 0
349+ : s
350+
351+ hexn :: Word64 -> Int -> Char
352+ hexn w r = intToDigit $ fromIntegral ((w `shiftR` r) .&. 0xf)
295353
296− hexw' :: Word32 -> String -> String
297− hexw' w s = '-' : hexn w 28 : hexn w 24 : hexn w 20 : hexn w 16
298− : '-' : hexn w 12 : hexn w 8 : hexn w 4 : hexn w 0 : s
354+ (w0,w1) = toWords64 uuid
299355
300− hexn :: Word32 -> Int -> Char
301− hexn w r = intToDigit $ fromIntegral ((w `shiftR` r) .&. 0xf)
356+-- | If the passed in `Text` can be parsed as an ASCII representation of
357+-- a `UUID`, it will be. The hyphens may not be omitted.
358+fromText :: Text -> Maybe UUID
359+fromText = fromASCIIBytes . T.encodeUtf8
360+
361+-- | Convert a UUID into a hyphentated string using lower-case letters.
362+toText :: UUID -> Text
363+toText = T.decodeLatin1 . toASCIIBytes
302364
303365-- | Convert a UUID into a hyphentated string using lower-case letters, packed
304366-- as ASCII bytes into `B.ByteString`.
@@ -392,7 +454,9 @@ fromASCIIBytes bs = do
392454
393455-- | Similar to `toASCIIBytes` except we produce a lazy `BL.ByteString`.
394456toLazyASCIIBytes :: UUID -> BL.ByteString
395−toLazyASCIIBytes = BL.fromStrict . toASCIIBytes
457+toLazyASCIIBytes =
458+ BL.fromStrict
459+ . toASCIIBytes
396460
397461-- | Similar to `fromASCIIBytes` except parses from a lazy `BL.ByteString`.
398462fromLazyASCIIBytes :: BL.ByteString -> Maybe UUID
@@ -403,27 +467,18 @@ fromLazyASCIIBytes bs =
403467-- Class Instances
404468--
405469
470+-- | This 'Random' instance produces __insecure__ version 4 UUIDs as
471+-- specified in <http://tools.ietf.org/html/rfc4122 RFC 4122>.
406472instance Random UUID where
407− random g = (fromGenNext w0 w1 w2 w3 w4, g4)
408− where (w0, g0) = next g
409− (w1, g1) = next g0
410− (w2, g2) = next g1
411− (w3, g3) = next g2
412− (w4, g4) = next g3
473+ random = uniform
413474 randomR _ = random -- range is ignored
414475
415−-- |Build a UUID from the results of five calls to next on a StdGen.
416−-- While next on StdGet returns an Int, it doesn't provide 32 bits of
417−-- randomness. This code relies on at last 28 bits of randomness in the
418−-- and optimizes its use so as to make only five random values, not six.
419−fromGenNext :: Int -> Int -> Int -> Int -> Int -> UUID
420−fromGenNext w0 w1 w2 w3 w4 =
421− buildFromBytes 4 /-/ (ThreeByte w0)
422− /-/ (ThreeByte w1)
423− /-/ w2 -- use all 4 bytes because we know the version
424− -- field will "cover" the upper, non-random bits
425− /-/ (ThreeByte w3)
426− /-/ (ThreeByte w4)
476+-- @since 1.0.4
477+instance Uniform UUID where
478+ uniformM gen = do
479+ w0 <- uniformWord64 gen
480+ w1 <- uniformWord64 gen
481+ pure $ buildFromBytes 4 /-/ w0 /-/ w1
427482
428483-- |A ByteSource to extract only three bytes from an Int, since next on StdGet
429484-- only returns 31 bits of randomness.
@@ -431,24 +486,29 @@ type instance ByteSink ThreeByte g = Takes3Bytes g
431486newtype ThreeByte = ThreeByte Int
432487instance ByteSource ThreeByte where
433488 f /-/ (ThreeByte w) = f b1 b2 b3
434− where b1 = fromIntegral (w `shiftR` 16)
435− b2 = fromIntegral (w `shiftR` 8)
489+ where b1 = fromIntegral (w `unsafeShiftR` 16)
490+ b2 = fromIntegral (w `unsafeShiftR` 8)
436491 b3 = fromIntegral w
437492
438493instance NFData UUID where
439− rnf = rnf . toWords
494+ rnf = flip seq ()
440495
441496instance Hashable UUID where
442− hash (UUID w0 w1 w2 w3) =
497+ hash (toWords -> (w0,w1,w2,w3)) =
443498 hash w0 `hashWithSalt` w1
444499 `hashWithSalt` w2
445500 `hashWithSalt` w3
446− hashWithSalt s (UUID w0 w1 w2 w3) =
501+ hashWithSalt s (toWords -> (w0,w1,w2,w3)) =
447502 s `hashWithSalt` w0
448503 `hashWithSalt` w1
449504 `hashWithSalt` w2
450505 `hashWithSalt` w3
451506
507+-- | Pretty prints a 'UUID' (without quotation marks). See also 'toString'.
508+--
509+-- >>> show nil
510+-- "00000000-0000-0000-0000-000000000000"
511+--
452512instance Show UUID where
453513 show = toString
454514
@@ -459,7 +519,7 @@ instance Read UUID where
459519 Nothing -> []
460520 Just u -> [(u,drop 36 noSpaces)]
461521
462−
522+-- | This 'Storable' instance uses the memory layout as described in <http://tools.ietf.org/html/rfc4122 RFC 4122>, but in contrast to the 'Binary' instance, __the fields are stored in host byte order__.
463523instance Storable UUID where
464524 sizeOf _ = 16
465525 alignment _ = 4
@@ -496,10 +556,10 @@ instance Storable UUID where
496556 pokeByteOff p (off+14) x9
497557 pokeByteOff p (off+15) x10
498558
559+-- | This 'Binary' instance is compatible with <http://tools.ietf.org/html/rfc4122 RFC 4122>, storing the fields in network order as 16 bytes.
499560instance Binary UUID where
500− put (UUID w0 w1 w2 w3) =
501− putWord32be w0 >> putWord32be w1 >> putWord32be w2 >> putWord32be w3
502− get = liftM4 UUID getWord32be getWord32be getWord32be getWord32be
561+ put (UUID w0 w1) = putWord64be w0 >> putWord64be w1
562+ get = liftM2 UUID getWord64be getWord64be
503563
504564
505565-- My goal with this instance was to make it work just enough to do what
@@ -510,10 +570,6 @@ instance Data UUID where
510570 dataTypeOf _ = uuidType
511571
512572uuidType :: DataType
513−uuidType = mkNoRepType "Data.UUID.UUID"
514−
515−#if !(MIN_VERSION_base(4,2,0))
516−mkNoRepType :: String -> DataType
517−mkNoRepType = mkNorepType
518−#endif
573+uuidType = mkNoRepType "Data.UUID.Types.UUID"
519574
575+deriving instance Lift UUID