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Haskell: Compress with GZip and write to file

Problem:

In Haskell, you want to gzip-compress a string and write it to a file.

Solution

We’ll use the zlib module for that. You might need to run

install_zlib_cabal.sh
cabal install zlib

if you haven’t done that already.

Here’s the code that writes the string foobar to the gzip-compressed file foo.gz:

example.txt
-- GZip compression
import qualified Codec.Compression.GZip as GZip
-- Needed to convert String literals to ByteString
import Data.ByteString.Lazy.Char8(pack)
-- ByteString.writeFile
import qualified Data.ByteString.Lazy as ByteString

main = do
       let compressedContent = pack "foobar"
       ByteString.writeFile "foo.gz" (GZip.compress compressedContent)has

 

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