From: Ramakrishnan Muthukrishnan Date: Mon, 18 Jul 2016 03:57:00 +0000 (+0530) Subject: beginning of the filesystem module X-Git-Url: https://git.rkrishnan.org/(%5B%5E?a=commitdiff_plain;h=f1e15c8b2e9798b0ceb57423354e758a63ce1294;p=functorrent.git beginning of the filesystem module --- diff --git a/functorrent.cabal b/functorrent.cabal index 63ce6d2..69d7722 100644 --- a/functorrent.cabal +++ b/functorrent.cabal @@ -20,6 +20,7 @@ library hs-source-dirs: src exposed-modules: FuncTorrent.Bencode , FuncTorrent.Metainfo + , FuncTorrent.Filesystem build-depends: base >= 4.7 && < 5 , bytestring , containers diff --git a/src/FuncTorrent/Filesystem.hs b/src/FuncTorrent/Filesystem.hs index 66468c4..cc757d4 100644 --- a/src/FuncTorrent/Filesystem.hs +++ b/src/FuncTorrent/Filesystem.hs @@ -16,15 +16,69 @@ - You should have received a copy of the GNU General Public License - along with FuncTorrent; if not, see -} +{-# LANGUAGE OverloadedStrings #-} module FuncTorrent.Filesystem (new , FilesystemState - , getBlock - , putBlock , getStats ) where -data Filesystem = Filesystem { pieces :: [Piece] +import Data.ByteString (ByteString) +import qualified Data.ByteString.Char8 as BC (take, drop, null) +import Control.Concurrent.MVar (MVar, newMVar, readMVar) +import System.IO (FilePath) +import System.Environment (getEnv) + +import FuncTorrent.Metainfo (Metainfo(..), Info(..), FileInfo(..)) + +data Filesystem = Filesystem { fs :: [File] , stats :: Stats - + } + +newtype FilesystemState = FilesystemState (MVar Filesystem) + +data File = File { name :: FilePath + , ps :: [Piece] + } + +data Piece = Piece { hash :: ByteString + } + +data Block = Block { offset :: Integer + , len :: Integer + } + +data Stats = Stats { read :: Integer + , written :: Integer + } + +new :: Metainfo -> IO FilesystemState +new m = do + home <- getEnv "HOME" + let baseDir = home ++ "/Downloads/" + files' = files (info m) + pieceLen = pieceLength (info m) + h = infoHash m + numPiecesList = map (\f -> numPieces (lengthInBytes f) pieceLen) files' + hashes = snd $ foldl (\(bs, b) a -> (BC.drop (fromIntegral a) bs, b ++ [BC.take (fromIntegral a) bs])) (h, [] :: [ByteString]) (map (* 20) numPiecesList) + hss = map (splitN 20) hashes + newFile p hs = File { name = p, ps = map Piece hs } + fs = map (\(f, hs) -> let p = baseDir ++ (path f) + in newFile p hs) (zip files' hss) + v <- newMVar (Filesystem fs (Stats 0 0)) + return (FilesystemState v) + +getStats :: FilesystemState -> IO Stats +getStats (FilesystemState fsState) = do + (Filesystem _ stats') <- readMVar fsState + return stats' + +numPieces :: Integer -> Integer -> Integer +numPieces fileLen pieceLen | fileLen `mod` pieceLen == 0 = (fileLen `div` pieceLen) + | otherwise = (fileLen `div` pieceLen) + 1 + +splitN :: Int -> ByteString -> [ByteString] +splitN n bs | BC.null bs = [] + | otherwise = BC.take n bs : splitN n (BC.drop n bs) +