add getFileSize, which can get the real size of a large file on Windows

Avoid using fileSize which maxes out at just 2 gb on Windows.
Instead, use hFileSize, which doesn't have a bounded size.
Fixes support for files > 2 gb on Windows.

Note that the InodeCache code only needs to compare a file size,
so it doesn't matter it the file size wraps. So it has been
left as-is. This was necessary both to avoid invalidating existing inode
caches, and because the code passed FileStatus around and would have become
more expensive if it called getFileSize.

This commit was sponsored by Christian Dietrich.

2 files changed, 2 insertions, 3 deletions

diff --git a/Remote/Helper/Chunked.hs b/Remote/Helper/Chunked.hs
index 806fab542..8516268ce 100644
--- a/Remote/Helper/Chunked.hs
+++ b/Remote/Helper/Chunked.hs
@@ -244,8 +244,7 @@ retrieveChunks retriever u chunkconfig encryptor basek dest basep sink
 	| otherwise = go =<< chunkKeys u chunkconfig basek
   where
 	go ls = do
-		currsize <- liftIO $ catchMaybeIO $
-			toInteger . fileSize <$> getFileStatus dest
+		currsize <- liftIO $ catchMaybeIO $ getFileSize dest
 		let ls' = maybe ls (setupResume ls) currsize
 		if any null ls'
 			then return True -- dest is already complete
diff --git a/Remote/Helper/Http.hs b/Remote/Helper/Http.hs
index 6ce5bacb8..3d08066ba 100644
--- a/Remote/Helper/Http.hs
+++ b/Remote/Helper/Http.hs
@@ -32,7 +32,7 @@ httpStorer a = fileStorer $ \k f m -> a k =<< liftIO (httpBodyStorer f m)
 -- the meter as it's sent.
 httpBodyStorer :: FilePath -> MeterUpdate -> IO RequestBody
 httpBodyStorer src m = do
-	size <- fromIntegral . fileSize <$> getFileStatus src :: IO Integer
+	size <- getFileSize src
 	let streamer sink = withMeteredFile src m $ \b -> byteStringPopper b sink
 	return $ RequestBodyStream (fromInteger size) streamer