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Check 'fromDistinctAscList' invariants when deserializing containers #153

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Check 'fromDistinctAscList' invariants when deserializing containers #153

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48 changes: 40 additions & 8 deletions src/Data/Binary/Class.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -638,22 +638,54 @@ instance Binary BS.ShortByteString where
------------------------------------------------------------------------
-- Maps and Sets

instance (Binary a) => Binary (Set.Set a) where
instance (Ord a, Binary a) => Binary (Set.Set a) where
put s = put (Set.size s) <> mapM_ put (Set.toAscList s)
get = liftM Set.fromDistinctAscList get

instance (Binary k, Binary e) => Binary (Map.Map k e) where
get = do ascList <- get
case ascList of
[] -> pure Set.empty
x:xs -> do guardAsc x xs
pure (Set.fromDistinctAscList ascList)
where guardAsc _ [] = pure ()
guardAsc x (y:xs)
| x < y = guardAsc y xs
| otherwise = fail "Set values are not ascending!"

instance (Ord k, Binary k, Binary e) => Binary (Map.Map k e) where
put m = put (Map.size m) <> mapM_ put (Map.toAscList m)
get = liftM Map.fromDistinctAscList get
get = do ascList <- get
case ascList of
[] -> pure Map.empty
(k,_):kvs -> do guardAsc k kvs
pure (Map.fromDistinctAscList ascList)
where guardAsc _ [] = pure ()
guardAsc k ((j,_):kvs)
| k < j = guardAsc j kvs
| otherwise = fail "Map keys are not ascending!"

instance Binary IntSet.IntSet where
put s = put (IntSet.size s) <> mapM_ put (IntSet.toAscList s)
get = liftM IntSet.fromDistinctAscList get
get = do ascList <- get
case ascList of
[] -> pure IntSet.empty
i:is -> do guardAsc i is
pure (IntSet.fromDistinctAscList ascList)
where guardAsc _ [] = pure ()
guardAsc i (j:is)
| i < j = guardAsc j is
| otherwise = fail "IntSet values are not ascending!"

instance (Binary e) => Binary (IntMap.IntMap e) where
put m = put (IntMap.size m) <> mapM_ put (IntMap.toAscList m)
get = liftM IntMap.fromDistinctAscList get

get = do ascList <- get
case ascList of
[] -> pure IntMap.empty
(i,_):ivs -> do guardAsc i ivs
pure (IntMap.fromDistinctAscList ascList)
where guardAsc _ [] = pure ()
guardAsc i ((j,_):ivs)
| i < j = guardAsc j ivs
| otherwise = fail "IntMap keys are not ascending!"

------------------------------------------------------------------------
-- Queues and Sequences

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