Johannes Waldmann wrote:
> i'd like to read a byte stream from stdin. the stream contains 0xFF
> now and then. i fear that such a byte is treated as EOF by ghc,
> because processing seems to stop right after it first occured.
Hmmm, I've never experienced something like this. The following code
snippet from my Quake level viewer works fine:
-------------------------------------------------------------------
...
qGetN :: Integral a => a -> (Handle -> IO b) -> Handle -> IO [b]
qGetN n f = sequence . replicate (fromIntegral n) . f
-- read n bytes, Intel-like
readBytes :: Num a => Int -> Handle -> IO a
readBytes n h =
liftM (foldr (\x val -> val * 256 + fromIntegral (fromEnum x)) 0)
(qGetN n hGetChar h)
...
type Qushort = Word16
qushortSize :: Int
qushortSize = 2
qGetQushort :: Handle -> IO Qushort
qGetQushort = readBytes qushortSize
...
-------------------------------------------------------------------
What GHC version/platform are you using?
But Haskell *really* needs some standard way of reading values in the
native format on a platform:
http://www.informatik.uni-muenchen.de/haskell-wish-list/items.php3?id=5
Why? Just have a look at the following stuff: :-P
-------------------------------------------------------------------
type Qfloat = Float -- hopefully 32-bit IEEE floating point
qfloatSize :: Int
qfloatSize = 4
-- Aaaaaargl!!!!!!!
qGetQfloat :: Handle -> IO Qfloat
qGetQfloat h = do
a <- hGetChar h
b <- hGetChar h
c <- hGetChar h
d <- hGetChar h
_casm_ ``union {float f; char c[4];} x; x.c[0]=%0; x.c[1]=%1; x.c[2]=%2; x.c[3]=%3;
%r=x.f;'' a b c d
-------------------------------------------------------------------
Embarrassing...
Cheers,
Sven
--
Sven Panne Tel.: +49/89/2178-2235
LMU, Institut fuer Informatik FAX : +49/89/2178-2211
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