binary files in haskell
Tue, 06 Feb 2001 11:32:30 +0000
Simon Marlow wrote:
> > http://www.ugcs.caltech.edu/~john/computer/haskell/
> How about this slightly more general interface, which works with the new
> FFI libraries, and is trivial to implement on top of the primitives in
> GHC's IOExts:
> hPut :: Storable a => Handle -> a -> IO ()
> hGet :: Storable a => Handle -> IO a
What about endianess? In which format are Floats or even just Bools
stored? For a file which probably shall be read from different machines
this is not clear at all.
I think John is right that there needs to be a primitive interface for
just writing bytes. You can then build anything more complicated on top
(probably different high-level ones for different purposes).
I just see one problem with John's proposal: the type Byte. It is
completely useless if you don't have operations that go with it;
bit-operations and conversions to and from Int. The FFI already defines
such a type: Word8. So I suggest that the binary IO library explicitely
reads and writes Word8's.
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