-}
module FuncTorrent.Utils
- (createDummyFile,
- writeFileAtOffset,
- readFileAtOffset,
- splitNum,
- splitN,
- verifyHash
+ ( createDummyFile
+ , writeFileAtOffset
+ , readFileAtOffset
+ , splitNum
+ , splitN
+ , verifyHash
+ , IP
+ , Port
+ , toIP
+ , toPort
+ , getHostname
+ , getPort
)
where
import qualified Crypto.Hash.SHA1 as SHA1 (hash)
import Control.Exception.Base (IOException, try)
import Data.ByteString (ByteString, writeFile, hPut, hGet, take)
+import qualified Data.ByteString.Base16 as B16 (encode)
import qualified Data.ByteString.Char8 as BC
+import Data.List (intercalate)
import System.IO (Handle, hSeek, SeekMode(..))
import System.Directory (doesFileExist)
+type IP = String
+type Port = Integer
+
splitN :: Int -> BC.ByteString -> [BC.ByteString]
splitN n bs | BC.null bs = []
| otherwise = BC.take n bs : splitN n (BC.drop n bs)
createDummyFile path size = do
dfe <- doesFileExist path
if not dfe
- then do
+ then
try $ writeFile path (BC.replicate size '\0')
else
return $ Right ()
verifyHash :: ByteString -> ByteString -> Bool
verifyHash bs pieceHash =
take 20 (SHA1.hash bs) == pieceHash
+
+toPort :: ByteString -> Port
+toPort = read . ("0x" ++) . BC.unpack . B16.encode
+
+toIP :: ByteString -> IP
+toIP = Data.List.intercalate "." .
+ map (show . toInt . ("0x" ++) . BC.unpack) .
+ splitN 2 . B16.encode
+
+toInt :: String -> Integer
+toInt = read
+
+getHostname :: String -> String
+getHostname url = takeWhile (/= ':') $ drop 2 $ dropWhile (/= '/') url
+
+getPort :: String -> Port
+getPort url = read $ takeWhile (/= '/') $ drop 1 $ dropWhile (/= ':') $ drop 2 $ dropWhile (/= '/') url