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{-| Provides interface to the 'zlib' library.
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-}
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{-
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Copyright (C) 2014 Google Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA.
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-}
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module Ganeti.Codec
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( compressZlib
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, decompressZlib
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) where
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import Codec.Compression.Zlib (compress)
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import qualified Codec.Compression.Zlib.Internal as I
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import Control.Monad.Error
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import qualified Data.ByteString.Lazy as BL
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import qualified Data.ByteString.Lazy.Internal as BL
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import Data.Monoid (mempty)
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-- | Compresses a lazy bytestring.
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compressZlib :: BL.ByteString -> BL.ByteString
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compressZlib = compress
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-- | Decompresses a lazy bytestring, throwing decoding errors using
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-- 'throwError'.
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decompressZlib :: (MonadError e m, Error e) => BL.ByteString -> m BL.ByteString
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decompressZlib = I.foldDecompressStream
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(liftM . BL.chunk)
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(return mempty)
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(const $ throwError . strMsg . ("Zlib: " ++))
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. I.decompressWithErrors
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I.zlibFormat
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I.defaultDecompressParams
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