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{-# OPTIONS_GHC -fno-warn-orphans #-}
{-# LANGUAGE OverloadedStrings #-}
import Test.Hspec.Monadic
import Test.Hspec.HUnit ()
import Test.Hspec.QuickCheck (prop)
import Test.QuickCheck (Arbitrary (..))
import Test.HUnit
import Codec.Zlib
import Codec.Compression.Zlib
import qualified Codec.Compression.GZip as Gzip
import qualified Data.ByteString as S
import qualified Data.ByteString.Char8 as S8
import qualified Data.ByteString.Lazy as L
import Control.Monad (foldM, forM_, forM)
import System.IO.Unsafe (unsafePerformIO)
decompress' :: L.ByteString -> L.ByteString
decompress' gziped = unsafePerformIO $ do
inf <- initInflate defaultWindowBits
ungziped <- foldM (go' inf) id $ L.toChunks gziped
final <- finishInflate inf
return $ L.fromChunks $ ungziped [final]
where
go' inf front bs = feedInflate inf bs >>= go front
go front x = do
y <- x
case y of
Nothing -> return front
Just z -> go (front . (:) z) x
instance Arbitrary L.ByteString where
arbitrary = L.fromChunks `fmap` arbitrary
instance Arbitrary S.ByteString where
arbitrary = S.pack `fmap` arbitrary
compress' :: L.ByteString -> L.ByteString
compress' raw = unsafePerformIO $ do
def <- initDeflate 7 defaultWindowBits
gziped <- foldM (go' def) id $ L.toChunks raw
gziped' <- go gziped $ finishDeflate def
return $ L.fromChunks $ gziped' []
where
go' def front bs = feedDeflate def bs >>= go front
go front x = do
y <- x
case y of
Nothing -> return front
Just z -> go (front . (:) z) x
license :: S.ByteString
license = S8.filter (/= '\r') $ unsafePerformIO $ S.readFile "LICENSE"
exampleDict :: S.ByteString
exampleDict = "INITIALDICTIONARY"
deflateWithDict :: S.ByteString -> L.ByteString -> L.ByteString
deflateWithDict dict raw = unsafePerformIO $ do
def <- initDeflateWithDictionary 7 dict $ WindowBits 15
compressed <- foldM (go' def) id $ L.toChunks raw
compressed' <- go compressed $ finishDeflate def
return $ L.fromChunks $ compressed' []
where
go' def front bs = feedDeflate def bs >>= go front
go front x = do
y <- x
case y of
Nothing -> return front
Just z -> go (front . (:) z) x
inflateWithDict :: S.ByteString -> L.ByteString -> L.ByteString
inflateWithDict dict compressed = unsafePerformIO $ do
inf <- initInflateWithDictionary (WindowBits 15) dict
decompressed <- foldM (go' inf) id $ L.toChunks compressed
final <- finishInflate inf
return $ L.fromChunks $ decompressed [final]
where
go' inf front bs = feedInflate inf bs >>= go front
go front x = do
y <- x
case y of
Nothing -> return front
Just z -> go (front . (:) z) x
main :: IO ()
main = hspecX $ do
describe "inflate/deflate" $ do
prop "decompress'" $ \lbs -> lbs == decompress' (compress lbs)
prop "compress'" $ \lbs -> lbs == decompress (compress' lbs)
prop "with dictionary" $ \bs ->
bs ==
(inflateWithDict exampleDict . deflateWithDict exampleDict) bs
it "different dict" $ do
raw <- L.readFile "LICENSE"
deflated <- return $ deflateWithDict exampleDict raw
inflated <- return $ inflateWithDict (S.drop 1 exampleDict) deflated
assertBool "is null" $ L.null inflated
describe "license" $ do
it "single deflate" $ do
let go front x = do
y <- x
case y of
Nothing -> return front
Just z -> go (front . (:) z) x
def <- initDeflate 8 $ WindowBits 31
gziped <- feedDeflate def license >>= go id
gziped' <- go gziped $ finishDeflate def
let raw' = L.fromChunks [license]
raw' @?= Gzip.decompress (L.fromChunks $ gziped' [])
it "single inflate" $ do
let go front x = do
y <- x
case y of
Nothing -> return front
Just z -> go (front . (:) z) x
gziped <- S.readFile "LICENSE.gz"
inf <- initInflate $ WindowBits 31
popper <- feedInflate inf gziped
ungziped <- go id popper
final <- finishInflate inf
license @?= (S.concat $ ungziped [final])
it "multi deflate" $ do
let go' inf front bs = feedDeflate inf bs >>= go front
go front x = do
y <- x
case y of
Nothing -> return front
Just z -> go (front . (:) z) x
def <- initDeflate 5 $ WindowBits 31
gziped <- foldM (go' def) id $ map S.singleton $ S.unpack license
gziped' <- go gziped $ finishDeflate def
let raw' = L.fromChunks [license]
raw' @?= (Gzip.decompress $ L.fromChunks $ gziped' [])
it "multi inflate" $ do
let go' inf front bs = feedInflate inf bs >>= go front
go front x = do
y <- x
case y of
Nothing -> return front
Just z -> go (front . (:) z) x
gziped <- S.readFile "LICENSE.gz"
let gziped' = map S.singleton $ S.unpack gziped
inf <- initInflate $ WindowBits 31
ungziped' <- foldM (go' inf) id gziped'
final <- finishInflate inf
license @?= (S.concat $ ungziped' [final])
describe "lbs zlib" $ do
prop "inflate" $ \lbs -> unsafePerformIO $ do
let glbs = compress lbs
go' inf front bs = feedInflate inf bs >>= go front
go front x = do
y <- x
case y of
Nothing -> return front
Just z -> go (front . (:) z) x
inf <- initInflate defaultWindowBits
inflated <- foldM (go' inf) id $ L.toChunks glbs
final <- finishInflate inf
return $ lbs == L.fromChunks (inflated [final])
prop "deflate" $ \lbs -> unsafePerformIO $ do
let go' inf front bs = feedDeflate inf bs >>= go front
go front x = do
y <- x
case y of
Nothing -> return front
Just z -> go (front . (:) z) x
def <- initDeflate 7 defaultWindowBits
deflated <- foldM (go' def) id $ L.toChunks lbs
deflated' <- go deflated $ finishDeflate def
return $ lbs == decompress (L.fromChunks (deflated' []))
describe "flushing" $ do
let helper wb = do
let bss0 = replicate 5000 "abc"
def <- initDeflate 9 wb
inf <- initInflate wb
let popList pop = do
mx <- pop
case mx of
Nothing -> return []
Just x -> do
xs <- popList pop
return $ x : xs
let callback name expected pop = do
bssDeflated <- popList pop
bsInflated <- fmap (S.concat . concat) $ forM bssDeflated $ \bs -> do
x <- feedInflate inf bs >>= popList
y <- flushInflate inf
return $ x ++ [y]
if bsInflated == expected
then return ()
else error $ "callback " ++ name ++ ", got: " ++ show bsInflated ++ ", expected: " ++ show expected
forM_ (zip [1..] bss0) $ \(i, bs) -> do
feedDeflate def bs >>= callback ("loop" ++ show (i :: Int)) ""
callback ("loop" ++ show (i :: Int)) bs $ flushDeflate def
callback "finish" "" $ finishDeflate def
it "zlib" $ helper defaultWindowBits
it "gzip" $ helper $ WindowBits 31
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