Convert a Lazy ByteString to a strict ByteString

Question

I have a function that takes a lazy ByteString, that I wish to have return lists of strict ByteStrings (the laziness should be transferred to the list type of the output).

import qualified Data.ByteString as B
import qualified Data.ByteString.Lazy as L
csVals :: L.ByteString -> [B.ByteString]

I want to do this for various reasons, several lexing functions require strict ByteStrings, and I can guarantee the outputted strict ByteStrings in the output of csVals above are very small.

How do I go about "strictifying" ByteStrings without chunking them?

Update0

I want to take a Lazy ByteString, and make one strict ByteString containing all its data.

Answer 1

The bytestring package now exports a toStrict function:

http://hackage.haskell.org/packages/archive/bytestring/0.10.2.0/doc/html/Data-ByteString-Lazy.html#v:toStrict

This might not be exactly what you want, but it certainly answers the question in the title of this post :)