From d03410277fbd01d3605d363688e186e41e7c5cb3 Mon Sep 17 00:00:00 2001
From: Ramakrishnan Muthukrishnan <ram@rkrishnan.org>
Date: Sun, 2 Aug 2015 20:57:28 +0530
Subject: [PATCH] write to the file name specified in the info structure

---
 src/FuncTorrent/Peer.hs | 27 ++++++++++++++-------------
 1 file changed, 14 insertions(+), 13 deletions(-)

diff --git a/src/FuncTorrent/Peer.hs b/src/FuncTorrent/Peer.hs
index e809f3f..afc2028 100644
--- a/src/FuncTorrent/Peer.hs
+++ b/src/FuncTorrent/Peer.hs
@@ -83,16 +83,16 @@ bitfieldToList bs = go bs 0
            setBits ++ go bs' (pos + 1)
 
 -- recvMsg :: Peer -> Handle -> Msg
-msgLoop :: PeerState -> PieceMap -> IO ()
-msgLoop pState@(PeerState { meInterested = False, heChoking = True }) pieceStatus =
+msgLoop :: PeerState -> PieceMap -> FilePath -> IO ()
+msgLoop pState@(PeerState { meInterested = False, heChoking = True }) pieceStatus file =
   do
     -- if me NOT Interested and she is Choking, tell her that
     -- I am interested.
     let h = handle pState
     sendMsg h InterestedMsg
     putStrLn $ "--> InterestedMsg to peer: " ++ show (peer pState)
-    msgLoop (pState { meInterested = True }) pieceStatus
-msgLoop pState@(PeerState { meInterested = True, heChoking = False }) pieceStatus =
+    msgLoop (pState { meInterested = True }) pieceStatus file
+msgLoop pState@(PeerState { meInterested = True, heChoking = False }) pieceStatus file =
   -- if me Interested and she not Choking, send her a request
   -- for a piece.
   case pickPiece pieceStatus of
@@ -107,16 +107,16 @@ msgLoop pState@(PeerState { meInterested = True, heChoking = False }) pieceStatu
        else do
        let fileOffset = if workPiece == 0 then 0 else workPiece * len (pieceStatus ! (workPiece - 1))
        putStrLn $ "Write into file at offset: " ++ show fileOffset
-       writeFileAtOffset "/tmp/download.file" fileOffset pBS
-       msgLoop pState (adjust (\pieceData -> pieceData { state = Have }) workPiece pieceStatus)
-msgLoop pState pieceStatus = do
+       writeFileAtOffset file fileOffset pBS
+       msgLoop pState (adjust (\pieceData -> pieceData { state = Have }) workPiece pieceStatus) file
+msgLoop pState pieceStatus file = do
   msg <- getMsg (handle pState)
   putStrLn $ "<-- " ++ show msg ++ "from peer: " ++ show (peer pState)
   case msg of
    KeepAliveMsg -> do
      sendMsg (handle pState) KeepAliveMsg
      putStrLn $ "--> " ++ "KeepAliveMsg to peer: " ++ show (peer pState)
-     msgLoop pState pieceStatus
+     msgLoop pState pieceStatus file
    BitFieldMsg bss -> do
      let pieceList = bitfieldToList (unpack bss)
          pieceStatus' = updatePieceAvailability pieceStatus (peer pState) pieceList
@@ -124,11 +124,11 @@ msgLoop pState pieceStatus = do
      -- for each pieceIndex in pieceList, make an entry in the pieceStatus
      -- map with pieceIndex as the key and modify the value to add the peer.
      -- download each of the piece in order
-     msgLoop pState pieceStatus'
+     msgLoop pState pieceStatus' file
    UnChokeMsg ->
-     msgLoop (pState { heChoking = False }) pieceStatus
+     msgLoop (pState { heChoking = False }) pieceStatus file
    _ ->
-     msgLoop pState pieceStatus
+     msgLoop pState pieceStatus file
 
 -- simple algorithm to pick piece.
 -- pick the first piece from 0 that is not downloaded yet.
@@ -161,9 +161,10 @@ handlePeerMsgs p m peerId = do
       numPieces = (toInteger . (`quot` 20) . BC.length) pieceHash
       pLen = pieceLength (info m)
       fileLen = lengthInBytes (info m)
+      fileName = name (info m)
       pieceStatus = mkPieceMap numPieces pieceHash (splitNum fileLen pLen)
-  createDummyFile "/tmp/download.file" (fromIntegral fileLen)
-  msgLoop state pieceStatus
+  createDummyFile fileName (fromIntegral fileLen)
+  msgLoop state pieceStatus fileName
   
 downloadPiece :: Handle -> Integer -> Integer -> IO ByteString
 downloadPiece h index pieceLength = do
-- 
2.37.2