[project @ 2002-04-26 13:34:05 by simonmar]

[ghc-base.git] / Data / Array / IO.hs

diff --git a/Data/Array/IO.hs b/Data/Array/IO.hs
index 9e7892e..b47e147 100644 (file)
--- a/Data/Array/IO.hs
+++ b/Data/Array/IO.hs
@@ -1,5 +1,6 @@
+{-# OPTIONS -#include "HsBase.h" #-}
 -----------------------------------------------------------------------------
--- 
+-- |
 -- Module      :  Data.Array.IO
 -- Copyright   :  (c) The University of Glasgow 2001
 -- License     :  BSD-style (see the file libraries/core/LICENSE)
@@ -8,8 +9,6 @@
 -- Stability   :  experimental
 -- Portability :  non-portable
 --
--- $Id: IO.hs,v 1.1 2001/06/28 14:15:02 simonmar Exp $
---
 -- Mutable boxed/unboxed arrays in the IO monad.
 --
 -----------------------------------------------------------------------------
@@ -19,6 +18,8 @@ module Data.Array.IO (
    IOArray,            -- instance of: Eq, Typeable
    IOUArray,           -- instance of: Eq, Typeable
    castIOUArray,       -- :: IOUArray i a -> IO (IOUArray i b)
+   hGetArray,          -- :: Handle -> IOUArray Int Word8 -> Int -> IO Int
+   hPutArray,          -- :: Handle -> IOUArray Int Word8 -> Int -> IO ()
  ) where
 
 import Prelude
@@ -29,6 +30,7 @@ import Data.Int
 import Data.Word
 import Data.Dynamic
 
+import Foreign.C
 import Foreign.Ptr             ( Ptr, FunPtr )
 import Foreign.StablePtr       ( StablePtr )
 
@@ -40,7 +42,10 @@ import GHC.Arr       ( STArray, freezeSTArray, unsafeFreezeSTArray,
                           thawSTArray, unsafeThawSTArray )
 
 import GHC.ST          ( ST(..) )
-import GHC.IOBase      ( stToIO )
+
+import GHC.IOBase
+import GHC.Handle
+import GHC.Conc
 
 import GHC.Base
 
@@ -362,4 +367,101 @@ castIOUArray (IOUArray marr) = stToIO $ do
     marr' <- castSTUArray marr
     return (IOUArray marr')
 
+-- ---------------------------------------------------------------------------
+-- hGetArray
+
+hGetArray :: Handle -> IOUArray Int Word8 -> Int -> IO Int
+hGetArray handle (IOUArray (STUArray l u ptr)) count
+  | count <= 0 || count > rangeSize (l,u)
+  = illegalBufferSize handle "hGetArray" count
+  | otherwise = do
+      wantReadableHandle "hGetArray" handle $ 
+       \ handle_@Handle__{ haFD=fd, haBuffer=ref, haIsStream=is_stream } -> do
+       buf@Buffer{ bufBuf=raw, bufWPtr=w, bufRPtr=r } <- readIORef ref
+       if bufferEmpty buf
+          then readChunk fd is_stream ptr 0 count
+          else do 
+               let avail = w - r
+               copied <- if (count >= avail)
+                           then do 
+                               memcpy_ba_baoff ptr raw r (fromIntegral avail)
+                               writeIORef ref buf{ bufWPtr=0, bufRPtr=0 }
+                               return avail
+                           else do 
+                               memcpy_ba_baoff ptr raw r (fromIntegral count)
+                               writeIORef ref buf{ bufRPtr = r + count }
+                               return count
+
+               let remaining = count - copied
+               if remaining > 0 
+                  then do rest <- readChunk fd is_stream ptr copied remaining
+                          return (rest + count)
+                  else return count
+
+readChunk :: FD -> Bool -> RawBuffer -> Int -> Int -> IO Int
+readChunk fd is_stream ptr init_off bytes = loop init_off bytes 
+ where
+  loop :: Int -> Int -> IO Int
+  loop off bytes | bytes <= 0 = return (off - init_off)
+  loop off bytes = do
+    r' <- throwErrnoIfMinus1RetryMayBlock "readChunk"
+           (read_off_ba (fromIntegral fd) is_stream ptr 
+               (fromIntegral off) (fromIntegral bytes))
+           (threadWaitRead fd)
+    let r = fromIntegral r'
+    if r == 0
+       then return (off - init_off)
+       else loop (off + r) (bytes - r)
+
+-- ---------------------------------------------------------------------------
+-- hPutArray
+
+hPutArray
+       :: Handle                       -- handle to write to
+       -> IOUArray Int Word8           -- buffer
+       -> Int                          -- number of bytes of data to write
+       -> IO ()
+
+hPutArray handle (IOUArray (STUArray l u raw)) count
+  | count <= 0 || count > rangeSize (l,u)
+  = illegalBufferSize handle "hPutArray" count
+  | otherwise
+   = do wantWritableHandle "hPutArray" handle $ 
+          \ handle_@Handle__{ haFD=fd, haBuffer=ref, haIsStream=stream } -> do
+
+          old_buf@Buffer{ bufBuf=old_raw, bufRPtr=r, bufWPtr=w, bufSize=size }
+           <- readIORef ref
+
+          -- enough room in handle buffer?
+          if (size - w > count)
+               -- There's enough room in the buffer:
+               -- just copy the data in and update bufWPtr.
+           then do memcpy_baoff_ba old_raw w raw (fromIntegral count)
+                   writeIORef ref old_buf{ bufWPtr = w + count }
+                   return ()
+
+               -- else, we have to flush
+           else do flushed_buf <- flushWriteBuffer fd stream old_buf
+                   writeIORef ref flushed_buf
+                   let this_buf = 
+                           Buffer{ bufBuf=raw, bufState=WriteBuffer, 
+                                   bufRPtr=0, bufWPtr=count, bufSize=count }
+                   flushWriteBuffer fd stream this_buf
+                   return ()
+
+-- ---------------------------------------------------------------------------
+-- Internal Utils
+
+foreign import ccall unsafe "__hscore_memcpy_dst_off"
+   memcpy_baoff_ba :: RawBuffer -> Int -> RawBuffer -> CSize -> IO (Ptr ())
+foreign import ccall unsafe "__hscore_memcpy_src_off"
+   memcpy_ba_baoff :: RawBuffer -> RawBuffer -> Int -> CSize -> IO (Ptr ())
+
+illegalBufferSize :: Handle -> String -> Int -> IO a
+illegalBufferSize handle fn sz = 
+       ioException (IOError (Just handle)
+                           InvalidArgument  fn
+                           ("illegal buffer size " ++ showsPrec 9 (sz::Int) [])
+                           Nothing)
+
 #endif /* __GLASGOW_HASKELL__ */