module Distribution.Server.Util.GZip (
    decompressNamed
  ) where

import qualified Codec.Compression.GZip as GZip
import Control.Exception
import Data.ByteString.Lazy.Internal

decompressNamed :: String -> ByteString -> ByteString
decompressNamed n bs =
    mapExceptionRecursive mapError $ GZip.decompress bs
  where
    mapError (ErrorCall str) = ErrorCall $ str ++ " in " ++ show n

mapExceptionRecursive :: (Exception e1, Exception e2) => (e1 -> e2) -> ByteString -> ByteString
mapExceptionRecursive f bs =
  case mapException f bs of
    Empty       -> Empty
    Chunk b bs' -> Chunk b (mapExceptionRecursive f bs')