escaping a string

Sat, 20 Sep 2008 19:54:19 -0700 

Greetings.
i'm playing around with the torrent specification. and i'm trying to talk to a tracker. 
for that i need to generate an info_hash
acording to the protocol definition the string needs to be escaped.
The 20 byte sha1 hash of the bencoded form of the info value from the metainfo file. Note that this is a substring of the metainfo file. This value will almost certainly have to be escaped.
my question here, if anyone has done that in the past, in cocoa, how was it done. and if you have any pointers on "escaping" a string in cocoa, any information would be usefull.. 

i've tried
torrentString = [torrentString stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding]; 
and
torrentString = [torrentString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; 

they both produce a null string, so obviously this is not it...
if it can help this is the string I have to escape.

start here--------------------------------------------------
6:lengthi367464134e4:name48:Stargate.Atlantis.S05E09.HDTV.XviD-0TV. [VTV].avi12:piece lengthi1048576e6:pieces7020:‹Olz;hBfï/k Òîvd˙Ù̉0>j’+‡;|8_Wg Ü:∏ˇHPR‰¯÷ó·êÎ∆BABÄ"<Ñgÿ| %Fˇ,Âw8th˜U*ÏâUR(‰¤F1>ÑìΩ‘• 
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end HERE--------------------------------------------------------------

thank you
Sandro.
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