-
Notifications
You must be signed in to change notification settings - Fork 67
/
Get.hs
647 lines (555 loc) · 21.1 KB
/
Get.hs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
{-# LANGUAGE CPP, RankNTypes, MagicHash, BangPatterns #-}
{-# LANGUAGE Trustworthy #-}
#if defined(__GLASGOW_HASKELL__) && !defined(__HADDOCK__)
#include "MachDeps.h"
#endif
-----------------------------------------------------------------------------
-- |
-- Module : Data.Binary.Get
-- Copyright : Lennart Kolmodin
-- License : BSD3-style (see LICENSE)
--
-- Maintainer : Lennart Kolmodin <kolmodin@gmail.com>
-- Stability : experimental
-- Portability : portable to Hugs and GHC.
--
-- The 'Get' monad. A monad for efficiently building structures from
-- encoded lazy ByteStrings.
--
-- Primitives are available to decode words of various sizes, both big and
-- little endian.
--
-- Let's decode binary data representing illustrated here.
-- In this example the values are in little endian.
--
-- > +------------------+--------------+-----------------+
-- > | 32 bit timestamp | 32 bit price | 16 bit quantity |
-- > +------------------+--------------+-----------------+
--
-- A corresponding Haskell value looks like this:
--
-- @
--data Trade = Trade
-- { timestamp :: !'Word32'
-- , price :: !'Word32'
-- , qty :: !'Word16'
-- } deriving ('Show')
-- @
--
-- The fields in @Trade@ are marked as strict (using @!@) since we don't need
-- laziness here. In practise, you would probably consider using the UNPACK
-- pragma as well.
-- <https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/glasgow_exts.html#unpack-pragma>
--
-- Now, let's have a look at a decoder for this format.
--
-- @
--getTrade :: 'Get' Trade
--getTrade = do
-- timestamp <- 'getWord32le'
-- price <- 'getWord32le'
-- quantity <- 'getWord16le'
-- return '$!' Trade timestamp price quantity
-- @
--
-- Or even simpler using applicative style:
--
-- @
--getTrade' :: 'Get' Trade
--getTrade' = Trade '<$>' 'getWord32le' '<*>' 'getWord32le' '<*>' 'getWord16le'
-- @
--
-- There are two kinds of ways to execute this decoder, the lazy input
-- method and the incremental input method. Here we will use the lazy
-- input method.
--
-- Let's first define a function that decodes many @Trade@s.
--
-- @
--getTrades :: Get [Trade]
--getTrades = do
-- empty <- 'isEmpty'
-- if empty
-- then return []
-- else do trade <- getTrade
-- trades <- getTrades
-- return (trade:trades)
-- @
--
-- Finally, we run the decoder:
--
-- @
--lazyIOExample :: IO [Trade]
--lazyIOExample = do
-- input <- BL.readFile \"trades.bin\"
-- return ('runGet' getTrades input)
-- @
--
-- This decoder has the downside that it will need to read all the input before
-- it can return. On the other hand, it will not return anything until
-- it knows it could decode without any decoder errors.
--
-- You could also refactor to a left-fold, to decode in a more streaming fashion,
-- and get the following decoder. It will start to return data without knowing
-- that it can decode all input.
--
-- @
--incrementalExample :: BL.ByteString -> [Trade]
--incrementalExample input0 = go decoder input0
-- where
-- decoder = 'runGetIncremental' getTrade
-- go :: 'Decoder' Trade -> BL.ByteString -> [Trade]
-- go ('Done' leftover _consumed trade) input =
-- trade : go decoder (BL.chunk leftover input)
-- go ('Partial' k) input =
-- go (k . takeHeadChunk $ input) (dropHeadChunk input)
-- go ('Fail' _leftover _consumed msg) _input =
-- error msg
--
--takeHeadChunk :: BL.ByteString -> Maybe BS.ByteString
--takeHeadChunk lbs =
-- case lbs of
-- (BL.Chunk bs _) -> Just bs
-- _ -> Nothing
--
--dropHeadChunk :: BL.ByteString -> BL.ByteString
--dropHeadChunk lbs =
-- case lbs of
-- (BL.Chunk _ lbs') -> lbs'
-- _ -> BL.Empty
-- @
--
-- The @lazyIOExample@ uses lazy I/O to read the file from the disk, which is
-- not suitable in all applications, and certainly not if you need to read
-- from a socket which has higher likelihood to fail. To address these needs,
-- use the incremental input method like in @incrementalExample@.
-- For an example of how to read incrementally from a Handle,
-- see the implementation of 'Data.Binary.decodeFileOrFail'.
-----------------------------------------------------------------------------
module Data.Binary.Get (
-- * The Get monad
Get
-- * The lazy input interface
-- $lazyinterface
, runGet
, runGetOrFail
, ByteOffset
-- * The incremental input interface
-- $incrementalinterface
, Decoder(..)
, runGetIncremental
-- ** Providing input
, pushChunk
, pushChunks
, pushEndOfInput
-- * Decoding
, skip
, isEmpty
, bytesRead
, isolate
, lookAhead
, lookAheadM
, lookAheadE
, label
-- ** ByteStrings
, getByteString
, getLazyByteString
, getLazyByteStringNul
, getRemainingLazyByteString
-- ** Decoding Words
, getWord8
-- *** Big-endian decoding
, getWord16be
, getWord32be
, getWord64be
-- *** Little-endian decoding
, getWord16le
, getWord32le
, getWord64le
-- *** Host-endian, unaligned decoding
, getWordhost
, getWord16host
, getWord32host
, getWord64host
-- ** Decoding Ints
, getInt8
-- *** Big-endian decoding
, getInt16be
, getInt32be
, getInt64be
-- *** Little-endian decoding
, getInt16le
, getInt32le
, getInt64le
-- *** Host-endian, unaligned decoding
, getInthost
, getInt16host
, getInt32host
, getInt64host
-- ** Decoding Floats/Doubles
, getFloatbe
, getFloatle
, getFloathost
, getDoublebe
, getDoublele
, getDoublehost
-- * Deprecated functions
, runGetState -- DEPRECATED
, remaining -- DEPRECATED
, getBytes -- DEPRECATED
) where
#if ! MIN_VERSION_base(4,8,0)
import Control.Applicative
#endif
import Foreign
import qualified Data.ByteString as B
import qualified Data.ByteString.Unsafe as B
import qualified Data.ByteString.Lazy as L
import qualified Data.ByteString.Lazy.Internal as L
import Data.Binary.Get.Internal hiding ( Decoder(..), runGetIncremental )
import qualified Data.Binary.Get.Internal as I
-- needed for casting words to float/double
import Data.Binary.FloatCast (wordToFloat, wordToDouble)
-- $lazyinterface
-- The lazy interface consumes a single lazy 'L.ByteString'. It's the easiest
-- interface to get started with, but it doesn't support interleaving I\/O and
-- parsing, unless lazy I/O is used.
--
-- There is no way to provide more input other than the initial data. To be
-- able to incrementally give more data, see the incremental input interface.
-- $incrementalinterface
-- The incremental interface gives you more control over how input is
-- provided during parsing. This lets you e.g. interleave parsing and
-- I\/O.
--
-- The incremental interface consumes a strict 'B.ByteString' at a time, each
-- being part of the total amount of input. If your decoder needs more input to
-- finish it will return a 'Partial' with a continuation.
-- If there is no more input, provide it 'Nothing'.
--
-- 'Fail' will be returned if it runs into an error, together with a message,
-- the position and the remaining input.
-- If it succeeds it will return 'Done' with the resulting value,
-- the position and the remaining input.
-- | A decoder procuced by running a 'Get' monad.
data Decoder a = Fail !B.ByteString {-# UNPACK #-} !ByteOffset String
-- ^ The decoder ran into an error. The decoder either used
-- 'fail' or was not provided enough input. Contains any
-- unconsumed input and the number of bytes consumed.
| Partial (Maybe B.ByteString -> Decoder a)
-- ^ The decoder has consumed the available input and needs
-- more to continue. Provide 'Just' if more input is available
-- and 'Nothing' otherwise, and you will get a new 'Decoder'.
| Done !B.ByteString {-# UNPACK #-} !ByteOffset a
-- ^ The decoder has successfully finished. Except for the
-- output value you also get any unused input as well as the
-- number of bytes consumed.
-- | Run a 'Get' monad. See 'Decoder' for what to do next, like providing
-- input, handling decoder errors and to get the output value.
-- Hint: Use the helper functions 'pushChunk', 'pushChunks' and
-- 'pushEndOfInput'.
runGetIncremental :: Get a -> Decoder a
runGetIncremental = calculateOffset . I.runGetIncremental
calculateOffset :: I.Decoder a -> Decoder a
calculateOffset r0 = go r0 0
where
go r !acc = case r of
I.Done inp a -> Done inp (acc - fromIntegral (B.length inp)) a
I.Fail inp s -> Fail inp (acc - fromIntegral (B.length inp)) s
I.Partial k ->
Partial $ \ms ->
case ms of
Nothing -> go (k Nothing) acc
Just i -> go (k ms) (acc + fromIntegral (B.length i))
I.BytesRead unused k ->
go (k $! (acc - unused)) acc
-- | DEPRECATED. Provides compatibility with previous versions of this library.
-- Run a 'Get' monad and return a tuple with three values.
-- The first value is the result of the decoder. The second and third are the
-- unused input, and the number of consumed bytes.
{-# DEPRECATED runGetState "Use runGetIncremental instead. This function will be removed." #-}
runGetState :: Get a -> L.ByteString -> ByteOffset -> (a, L.ByteString, ByteOffset)
runGetState g lbs0 pos' = go (runGetIncremental g) lbs0
where
go (Done s pos a) lbs = (a, L.chunk s lbs, pos+pos')
go (Partial k) lbs = go (k (takeHeadChunk lbs)) (dropHeadChunk lbs)
go (Fail _ pos msg) _ =
error ("Data.Binary.Get.runGetState at position " ++ show pos ++ ": " ++ msg)
takeHeadChunk :: L.ByteString -> Maybe B.ByteString
takeHeadChunk lbs =
case lbs of
(L.Chunk bs _) -> Just bs
_ -> Nothing
dropHeadChunk :: L.ByteString -> L.ByteString
dropHeadChunk lbs =
case lbs of
(L.Chunk _ lbs') -> lbs'
_ -> L.Empty
-- | Run a 'Get' monad and return 'Left' on failure and 'Right' on
-- success. In both cases any unconsumed input and the number of bytes
-- consumed is returned. In the case of failure, a human-readable
-- error message is included as well.
--
-- @since 0.6.4.0
runGetOrFail :: Get a -> L.ByteString
-> Either (L.ByteString, ByteOffset, String) (L.ByteString, ByteOffset, a)
runGetOrFail g lbs0 = feedAll (runGetIncremental g) lbs0
where
feedAll (Done bs pos x) lbs = Right (L.chunk bs lbs, pos, x)
feedAll (Partial k) lbs = feedAll (k (takeHeadChunk lbs)) (dropHeadChunk lbs)
feedAll (Fail x pos msg) xs = Left (L.chunk x xs, pos, msg)
-- | An offset, counted in bytes.
type ByteOffset = Int64
-- | The simplest interface to run a 'Get' decoder. If the decoder runs into
-- an error, calls 'fail', or runs out of input, it will call 'error'.
runGet :: Get a -> L.ByteString -> a
runGet g lbs0 = feedAll (runGetIncremental g) lbs0
where
feedAll (Done _ _ x) _ = x
feedAll (Partial k) lbs = feedAll (k (takeHeadChunk lbs)) (dropHeadChunk lbs)
feedAll (Fail _ pos msg) _ =
error ("Data.Binary.Get.runGet at position " ++ show pos ++ ": " ++ msg)
-- | Feed a 'Decoder' with more input. If the 'Decoder' is 'Done' or 'Fail' it
-- will add the input to 'B.ByteString' of unconsumed input.
--
-- @
-- 'runGetIncremental' myParser \`pushChunk\` myInput1 \`pushChunk\` myInput2
-- @
pushChunk :: Decoder a -> B.ByteString -> Decoder a
pushChunk r inp =
case r of
Done inp0 p a -> Done (inp0 `B.append` inp) p a
Partial k -> k (Just inp)
Fail inp0 p s -> Fail (inp0 `B.append` inp) p s
-- | Feed a 'Decoder' with more input. If the 'Decoder' is 'Done' or 'Fail' it
-- will add the input to 'L.ByteString' of unconsumed input.
--
-- @
-- 'runGetIncremental' myParser \`pushChunks\` myLazyByteString
-- @
pushChunks :: Decoder a -> L.ByteString -> Decoder a
pushChunks r0 = go r0 . L.toChunks
where
go r [] = r
go (Done inp pos a) xs = Done (B.concat (inp:xs)) pos a
go (Fail inp pos s) xs = Fail (B.concat (inp:xs)) pos s
go (Partial k) (x:xs) = go (k (Just x)) xs
-- | Tell a 'Decoder' that there is no more input. This passes 'Nothing' to a
-- 'Partial' decoder, otherwise returns the decoder unchanged.
pushEndOfInput :: Decoder a -> Decoder a
pushEndOfInput r =
case r of
Done _ _ _ -> r
Partial k -> k Nothing
Fail _ _ _ -> r
-- | Skip ahead @n@ bytes. Fails if fewer than @n@ bytes are available.
skip :: Int -> Get ()
skip n = withInputChunks (fromIntegral n) consumeBytes (const ()) failOnEOF
-- | An efficient get method for lazy ByteStrings. Fails if fewer than @n@
-- bytes are left in the input.
getLazyByteString :: Int64 -> Get L.ByteString
getLazyByteString n0 = withInputChunks n0 consumeBytes L.fromChunks failOnEOF
consumeBytes :: Consume Int64
consumeBytes n str
| fromIntegral (B.length str) >= n = Right (B.splitAt (fromIntegral n) str)
| otherwise = Left (n - fromIntegral (B.length str))
consumeUntilNul :: Consume ()
consumeUntilNul _ str =
case B.break (==0) str of
(want, rest) | B.null rest -> Left ()
| otherwise -> Right (want, B.drop 1 rest)
consumeAll :: Consume ()
consumeAll _ _ = Left ()
resumeOnEOF :: [B.ByteString] -> Get L.ByteString
resumeOnEOF = return . L.fromChunks
-- | Get a lazy ByteString that is terminated with a NUL byte.
-- The returned string does not contain the NUL byte. Fails
-- if it reaches the end of input without finding a NUL.
getLazyByteStringNul :: Get L.ByteString
getLazyByteStringNul = withInputChunks () consumeUntilNul L.fromChunks failOnEOF
-- | Get the remaining bytes as a lazy ByteString.
-- Note that this can be an expensive function to use as it forces reading
-- all input and keeping the string in-memory.
getRemainingLazyByteString :: Get L.ByteString
getRemainingLazyByteString = withInputChunks () consumeAll L.fromChunks resumeOnEOF
------------------------------------------------------------------------
-- Primtives
-- helper, get a raw Ptr onto a strict ByteString copied out of the
-- underlying lazy byteString.
getPtr :: Storable a => Int -> Get a
getPtr n = readNWith n peek
{-# INLINE getPtr #-}
-- | Read a Word8 from the monad state
getWord8 :: Get Word8
getWord8 = readN 1 B.unsafeHead
{-# INLINE[2] getWord8 #-}
-- | Read an Int8 from the monad state
getInt8 :: Get Int8
getInt8 = fromIntegral <$> getWord8
{-# INLINE getInt8 #-}
-- force GHC to inline getWordXX
{-# RULES
"getWord8/readN" getWord8 = readN 1 B.unsafeHead
"getWord16be/readN" getWord16be = readN 2 word16be
"getWord16le/readN" getWord16le = readN 2 word16le
"getWord32be/readN" getWord32be = readN 4 word32be
"getWord32le/readN" getWord32le = readN 4 word32le
"getWord64be/readN" getWord64be = readN 8 word64be
"getWord64le/readN" getWord64le = readN 8 word64le #-}
-- | Read a Word16 in big endian format
getWord16be :: Get Word16
getWord16be = readN 2 word16be
word16be :: B.ByteString -> Word16
word16be = \s ->
(fromIntegral (s `B.unsafeIndex` 0) `unsafeShiftL` 8) .|.
(fromIntegral (s `B.unsafeIndex` 1))
{-# INLINE[2] getWord16be #-}
{-# INLINE word16be #-}
-- | Read a Word16 in little endian format
getWord16le :: Get Word16
getWord16le = readN 2 word16le
word16le :: B.ByteString -> Word16
word16le = \s ->
(fromIntegral (s `B.unsafeIndex` 1) `unsafeShiftL` 8) .|.
(fromIntegral (s `B.unsafeIndex` 0) )
{-# INLINE[2] getWord16le #-}
{-# INLINE word16le #-}
-- | Read a Word32 in big endian format
getWord32be :: Get Word32
getWord32be = readN 4 word32be
word32be :: B.ByteString -> Word32
word32be = \s ->
(fromIntegral (s `B.unsafeIndex` 0) `unsafeShiftL` 24) .|.
(fromIntegral (s `B.unsafeIndex` 1) `unsafeShiftL` 16) .|.
(fromIntegral (s `B.unsafeIndex` 2) `unsafeShiftL` 8) .|.
(fromIntegral (s `B.unsafeIndex` 3) )
{-# INLINE[2] getWord32be #-}
{-# INLINE word32be #-}
-- | Read a Word32 in little endian format
getWord32le :: Get Word32
getWord32le = readN 4 word32le
word32le :: B.ByteString -> Word32
word32le = \s ->
(fromIntegral (s `B.unsafeIndex` 3) `unsafeShiftL` 24) .|.
(fromIntegral (s `B.unsafeIndex` 2) `unsafeShiftL` 16) .|.
(fromIntegral (s `B.unsafeIndex` 1) `unsafeShiftL` 8) .|.
(fromIntegral (s `B.unsafeIndex` 0) )
{-# INLINE[2] getWord32le #-}
{-# INLINE word32le #-}
-- | Read a Word64 in big endian format
getWord64be :: Get Word64
getWord64be = readN 8 word64be
word64be :: B.ByteString -> Word64
word64be = \s ->
(fromIntegral (s `B.unsafeIndex` 0) `unsafeShiftL` 56) .|.
(fromIntegral (s `B.unsafeIndex` 1) `unsafeShiftL` 48) .|.
(fromIntegral (s `B.unsafeIndex` 2) `unsafeShiftL` 40) .|.
(fromIntegral (s `B.unsafeIndex` 3) `unsafeShiftL` 32) .|.
(fromIntegral (s `B.unsafeIndex` 4) `unsafeShiftL` 24) .|.
(fromIntegral (s `B.unsafeIndex` 5) `unsafeShiftL` 16) .|.
(fromIntegral (s `B.unsafeIndex` 6) `unsafeShiftL` 8) .|.
(fromIntegral (s `B.unsafeIndex` 7) )
{-# INLINE[2] getWord64be #-}
{-# INLINE word64be #-}
-- | Read a Word64 in little endian format
getWord64le :: Get Word64
getWord64le = readN 8 word64le
word64le :: B.ByteString -> Word64
word64le = \s ->
(fromIntegral (s `B.unsafeIndex` 7) `unsafeShiftL` 56) .|.
(fromIntegral (s `B.unsafeIndex` 6) `unsafeShiftL` 48) .|.
(fromIntegral (s `B.unsafeIndex` 5) `unsafeShiftL` 40) .|.
(fromIntegral (s `B.unsafeIndex` 4) `unsafeShiftL` 32) .|.
(fromIntegral (s `B.unsafeIndex` 3) `unsafeShiftL` 24) .|.
(fromIntegral (s `B.unsafeIndex` 2) `unsafeShiftL` 16) .|.
(fromIntegral (s `B.unsafeIndex` 1) `unsafeShiftL` 8) .|.
(fromIntegral (s `B.unsafeIndex` 0) )
{-# INLINE[2] getWord64le #-}
{-# INLINE word64le #-}
-- | Read an Int16 in big endian format.
getInt16be :: Get Int16
getInt16be = fromIntegral <$> getWord16be
{-# INLINE getInt16be #-}
-- | Read an Int32 in big endian format.
getInt32be :: Get Int32
getInt32be = fromIntegral <$> getWord32be
{-# INLINE getInt32be #-}
-- | Read an Int64 in big endian format.
getInt64be :: Get Int64
getInt64be = fromIntegral <$> getWord64be
{-# INLINE getInt64be #-}
-- | Read an Int16 in little endian format.
getInt16le :: Get Int16
getInt16le = fromIntegral <$> getWord16le
{-# INLINE getInt16le #-}
-- | Read an Int32 in little endian format.
getInt32le :: Get Int32
getInt32le = fromIntegral <$> getWord32le
{-# INLINE getInt32le #-}
-- | Read an Int64 in little endian format.
getInt64le :: Get Int64
getInt64le = fromIntegral <$> getWord64le
{-# INLINE getInt64le #-}
------------------------------------------------------------------------
-- Host-endian reads
-- | /O(1)./ Read a single native machine word. The word is read in
-- host order, host endian form, for the machine you're on. On a 64 bit
-- machine the Word is an 8 byte value, on a 32 bit machine, 4 bytes.
getWordhost :: Get Word
getWordhost = getPtr (sizeOf (undefined :: Word))
{-# INLINE getWordhost #-}
-- | /O(1)./ Read a 2 byte Word16 in native host order and host endianness.
getWord16host :: Get Word16
getWord16host = getPtr (sizeOf (undefined :: Word16))
{-# INLINE getWord16host #-}
-- | /O(1)./ Read a Word32 in native host order and host endianness.
getWord32host :: Get Word32
getWord32host = getPtr (sizeOf (undefined :: Word32))
{-# INLINE getWord32host #-}
-- | /O(1)./ Read a Word64 in native host order and host endianess.
getWord64host :: Get Word64
getWord64host = getPtr (sizeOf (undefined :: Word64))
{-# INLINE getWord64host #-}
-- | /O(1)./ Read a single native machine word in native host
-- order. It works in the same way as 'getWordhost'.
getInthost :: Get Int
getInthost = getPtr (sizeOf (undefined :: Int))
{-# INLINE getInthost #-}
-- | /O(1)./ Read a 2 byte Int16 in native host order and host endianness.
getInt16host :: Get Int16
getInt16host = getPtr (sizeOf (undefined :: Int16))
{-# INLINE getInt16host #-}
-- | /O(1)./ Read an Int32 in native host order and host endianness.
getInt32host :: Get Int32
getInt32host = getPtr (sizeOf (undefined :: Int32))
{-# INLINE getInt32host #-}
-- | /O(1)./ Read an Int64 in native host order and host endianess.
getInt64host :: Get Int64
getInt64host = getPtr (sizeOf (undefined :: Int64))
{-# INLINE getInt64host #-}
------------------------------------------------------------------------
-- Double/Float reads
-- | Read a 'Float' in big endian IEEE-754 format.
getFloatbe :: Get Float
getFloatbe = wordToFloat <$> getWord32be
{-# INLINE getFloatbe #-}
-- | Read a 'Float' in little endian IEEE-754 format.
getFloatle :: Get Float
getFloatle = wordToFloat <$> getWord32le
{-# INLINE getFloatle #-}
-- | Read a 'Float' in IEEE-754 format and host endian.
getFloathost :: Get Float
getFloathost = wordToFloat <$> getWord32host
{-# INLINE getFloathost #-}
-- | Read a 'Double' in big endian IEEE-754 format.
getDoublebe :: Get Double
getDoublebe = wordToDouble <$> getWord64be
{-# INLINE getDoublebe #-}
-- | Read a 'Double' in little endian IEEE-754 format.
getDoublele :: Get Double
getDoublele = wordToDouble <$> getWord64le
{-# INLINE getDoublele #-}
-- | Read a 'Double' in IEEE-754 format and host endian.
getDoublehost :: Get Double
getDoublehost = wordToDouble <$> getWord64host
{-# INLINE getDoublehost #-}