1 {-# OPTIONS_GHC -fno-implicit-prelude -funbox-strict-fields #-}
2 {-# LANGUAGE BangPatterns #-}
3 -----------------------------------------------------------------------------
5 -- Module : GHC.IO.Encoding.Latin1
6 -- Copyright : (c) The University of Glasgow, 2009
7 -- License : see libraries/base/LICENSE
9 -- Maintainer : libraries@haskell.org
10 -- Stability : internal
11 -- Portability : non-portable
13 -- UTF-32 Codecs for the IO library
15 -- Portions Copyright : (c) Tom Harper 2008-2009,
16 -- (c) Bryan O'Sullivan 2009,
17 -- (c) Duncan Coutts 2009
19 -----------------------------------------------------------------------------
21 module GHC.IO.Encoding.Latin1 (
26 latin1_checked_encode,
33 import GHC.IO.Exception
35 import GHC.IO.Encoding.Types
38 -- -----------------------------------------------------------------------------
41 latin1 :: TextEncoding
42 latin1 = TextEncoding { mkTextDecoder = latin1_DF,
43 mkTextEncoder = latin1_EF }
45 latin1_DF :: IO TextDecoder
46 latin1_DF = return (BufferCodec latin1_decode (return ()))
48 latin1_EF :: IO TextEncoder
49 latin1_EF = return (BufferCodec latin1_encode (return ()))
51 latin1_checked :: TextEncoding
52 latin1_checked = TextEncoding { mkTextDecoder = latin1_DF,
53 mkTextEncoder = latin1_checked_EF }
55 latin1_checked_EF :: IO TextEncoder
56 latin1_checked_EF = return (BufferCodec latin1_checked_encode (return ()))
59 latin1_decode :: DecodeBuffer
61 input@Buffer{ bufRaw=iraw, bufL=ir0, bufR=iw, bufSize=_ }
62 output@Buffer{ bufRaw=oraw, bufL=_, bufR=ow0, bufSize=os }
65 | ow >= os || ir >= iw = done ir ow
67 c0 <- readWord8Buf iraw ir
68 writeCharBuf oraw ow (unsafeChr (fromIntegral c0))
71 -- lambda-lifted, to avoid thunks being built in the inner-loop:
72 done !ir !ow = return (if ir == iw then input{ bufL=0, bufR=0 }
73 else input{ bufL=ir },
78 latin1_encode :: EncodeBuffer
80 input@Buffer{ bufRaw=iraw, bufL=ir0, bufR=iw, bufSize=_ }
81 output@Buffer{ bufRaw=oraw, bufL=_, bufR=ow0, bufSize=os }
83 done !ir !ow = return (if ir == iw then input{ bufL=0, bufR=0 }
84 else input{ bufL=ir },
87 | ow >= os || ir >= iw = done ir ow
89 (c,ir') <- readCharBuf iraw ir
90 writeWord8Buf oraw ow (fromIntegral (ord c))
95 latin1_checked_encode :: EncodeBuffer
97 input@Buffer{ bufRaw=iraw, bufL=ir0, bufR=iw, bufSize=_ }
98 output@Buffer{ bufRaw=oraw, bufL=_, bufR=ow0, bufSize=os }
100 done !ir !ow = return (if ir == iw then input{ bufL=0, bufR=0 }
101 else input{ bufL=ir },
104 | ow >= os || ir >= iw = done ir ow
106 (c,ir') <- readCharBuf iraw ir
107 if ord c > 0xff then invalid else do
108 writeWord8Buf oraw ow (fromIntegral (ord c))
111 invalid = if ir > ir0 then done ir ow else ioe_encodingError
115 ioe_encodingError :: IO a
116 ioe_encodingError = ioException
117 (IOError Nothing InvalidArgument "latin1_checked_encode"
118 "character is out of range for this encoding" Nothing Nothing)