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{-# LANGUAGE ForeignFunctionInterface #-}
-- |
-- Module: Codec.Compression.Snappy
-- Copyright: (c) 2011 MailRank, Inc.
-- License: Apache
-- Maintainer: Bryan O'Sullivan <bos@serpentine.com>
-- Stability: experimental
-- Portability: portable
--
-- This module provides fast, pure Haskell bindings to Google's
-- Snappy compression and decompression library:
-- <http://code.google.com/p/snappy/>
--
-- These functions operate on strict bytestrings, and thus use as much
-- memory as both the entire compressed and uncompressed data.
module Codec.Compression.Snappy.Internal
(
check
, maxCompressedLength
) where
import Control.Monad (when)
import Foreign.C.Types (CSize(..))
maxCompressedLength :: Int -> Int
maxCompressedLength = fromIntegral . c_MaxCompressedLength . fromIntegral
{-# INLINE maxCompressedLength #-}
check :: (Integral a) => String -> IO a -> IO ()
check func act = do
ok <- act
when (ok == 0) . fail $ "Codec.Compression.Snappy." ++ func ++
": corrupt input "
{-# INLINE check #-}
foreign import ccall unsafe "hs_snappy.h _hsnappy_MaxCompressedLength"
c_MaxCompressedLength :: CSize -> CSize
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