Parsing Strings from a Binary File in Haskell

Question

I'm using the Data.Binary.Get monad to read data from a file in Haskell. How would I go about converting some Word32 grabbed from getWord32** into a [Char] or String?

I've tried breaking the Word32 into four octets and converting that way, but I'm having trouble getting the conversion working. How would I best convert a Word32 into a string (assuming four characters).

Does show work ? You can see how it's instance is implemented in base. — Sibi
– Sibi, Commented Oct 11, 2015 at 0:23

Sibi · Accepted Answer · 2015-10-11 00:42:02Z

1

The package utf8-light has a function named w2c function whose type is:

w2c ::Word32 -> Char

You can see how it's implemented:

w2c :: Word32 -> Char
{-# INLINE w2c #-}
#if defined(__GLASGOW_HASKELL__)
w2c (W32# w) = C#(chr#(word2Int# w))
#else
w2c = unsafeChr . fromIntegral
#endif

You can write a wrapper around it:

w2s :: Word32 -> String
w2s xs = [xs]

Alternatively, you can also use the show function since Word32 has an instance for it. But I guess, it has a performance penalty.

answered Oct 11, 2015 at 0:42

Sibi

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