From: Ramakrishnan Muthukrishnan <ram@rkrishnan.org>
Date: Thu, 12 Feb 2015 06:34:55 +0000 (+0530)
Subject: WIP: impement benc encoding, needed for infohash computation
X-Git-Url: https://git.rkrishnan.org/specifications/%5B/%5D%20/frontends/index.php?a=commitdiff_plain;h=d2570fdf01c6b7f1453c393aa11c680d7706540a;p=functorrent.git

WIP: impement benc encoding, needed for infohash computation
---

diff --git a/src/Bencode.hs b/src/Bencode.hs
index 4bbfa62..62627a6 100644
--- a/src/Bencode.hs
+++ b/src/Bencode.hs
@@ -108,3 +108,20 @@ bencVal = Bstr <$> bencStr <|>
 
 decode :: BC.ByteString -> Either ParseError BVal
 decode = parse bencVal "BVal"
+
+-- given an input dict or int or string, encode
+-- it into a bencoded bytestring.
+-- | encode bencoded-values
+--
+-- >>> encode (Bstr (BC.pack ""))
+-- "0:"
+-- >>> encode (Bstr (BC.pack "spam"))
+-- "4:spam"
+-- >>> encode (Bint 0)
+-- "i0e"
+-- >>> encode (Bint 42)
+-- "i42e"
+encode :: BVal -> String
+encode (Bstr bs) = let s = BC.unpack bs
+                   in show (length s) ++ ":" ++ s
+encode (Bint i) = "i" ++ show i ++ "e"