67 lines
2.3 KiB
Haskell
67 lines
2.3 KiB
Haskell
module Codec.Archive.Zip.Conduit.Internal
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( osVersion, zipVersion
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, zipError
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, idConduit
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, sizeCRC
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, outputSize
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, inputSize
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, maxBound32
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, deflateWindowBits
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) where
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import Codec.Compression.Zlib.Raw (WindowBits(..))
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import Control.Monad.Catch (MonadThrow, throwM)
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import qualified Data.ByteString as BS
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import qualified Data.Conduit as C
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import qualified Data.Conduit.Internal as CI
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import Data.Digest.CRC32 (crc32Update)
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import Data.Word (Word8, Word32, Word64)
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import Codec.Archive.Zip.Conduit.Types
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-- | The version of this zip program, really just rough indicator of compatibility
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zipVersion :: Word8
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zipVersion = 48
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-- | The OS this implementation tries to be compatible to
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osVersion :: Word8
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osVersion = 0 -- DOS
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zipError :: MonadThrow m => String -> m a
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zipError = throwM . ZipError
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idConduit :: Monad m => C.ConduitT a a m ()
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idConduit = C.awaitForever C.yield
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passthroughFold :: Monad m => (a -> b -> a) -> a -> C.ConduitM b b m a
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passthroughFold f z = C.await >>= maybe
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(return z)
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(\x -> do
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C.yield x
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passthroughFold f (f z x))
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sizeCRC :: Monad m => C.ConduitM BS.ByteString BS.ByteString m (Word64, Word32)
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sizeCRC = passthroughFold (\(l, c) b -> (l + fromIntegral (BS.length b), crc32Update c b)) (0, 0)
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sizeC :: Monad m => C.ConduitM BS.ByteString BS.ByteString m Word64
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sizeC = passthroughFold (\l b -> l + fromIntegral (BS.length b)) 0 -- fst <$> sizeCRC
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outputSize :: Monad m => C.ConduitT i BS.ByteString m () -> C.ConduitM i BS.ByteString m Word64
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outputSize = (C..| sizeC)
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inputSize :: Monad m => C.ConduitT BS.ByteString o m () -> C.ConduitM BS.ByteString o m Word64
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-- inputSize = fuseUpstream sizeC -- won't work because we need to deal with leftovers properly
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inputSize (CI.ConduitT src) = CI.ConduitT $ \rest -> let
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go n (CI.Done ()) = rest n
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go n (CI.PipeM m) = CI.PipeM $ go n <$> m
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go n (CI.Leftover p b) = CI.Leftover (go (n - fromIntegral (BS.length b)) p) b
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go n (CI.HaveOutput p o) = CI.HaveOutput (go n p) o
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go n (CI.NeedInput p q) = CI.NeedInput (\b -> go (n + fromIntegral (BS.length b)) (p b)) (go n . q)
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in go 0 (src CI.Done)
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maxBound32 :: Integral n => n
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maxBound32 = fromIntegral (maxBound :: Word32)
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deflateWindowBits :: WindowBits
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deflateWindowBits = WindowBits (-15)
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