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POParsing a torrent file - hash info. (Erlang)
 

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    <p>I'm trying to come up with the correct url-encoded info hash to send to the tracker in order to get the peers list.</p> <p>For testing, I tried parsing the torrent in <a href="http://www.legittorrents.info/index.php?page=torrent-details&amp;id=788f590f28a799cc1009a9b780b649fd6f0a2e91" rel="nofollow">this url</a>.</p> <p>After opening the file, manually cut the info dictionary piece and SHA1-hash it's value I get this binary value:</p> <p>&lt;&lt;84,124,15,255,155,171,156,168,91,46,204,24,249,116,110, 139,202,167,163,54>></p> <p>The ASCII string retrieved from the latter binary value is 788f590f28a799cc1009a9b780b649fd6f0a2e91, and it's the same value mentioned in the site.</p> <p>So let's assume everything is correct until now (isn't it?).</p> <p>After encoding the binary value using the url-encoding function below I get T%7c%0f%ff%9b%ab%9c%a8%5b.%cc%18%f9tn%8b%ca%a7%a36 , which is not even close to the correct urlencoded value that I should send to the tracker. (I get a not-found error message when I send this to the tracker, plus, it's not matched to the value I see using wireshark which is x%8fY%0f%28%a7%99%cc%10%09%a9%b7%80%b6I%fdo%0a.%91 ). </p> <p>The URL Encoding function I'm using:</p> <pre><code>encode(&lt;&lt;Bin:20/binary-unit:8&gt;&gt;)-&gt; %io:format("~p~n", [binary_to_list(Bin)]), encode(binary_to_list(Bin)); encode(List) -&gt; do_encode(List). do_encode([])-&gt; []; do_encode([H|T]) when H&gt;=$a, H=&lt;$z -&gt; [H| encode(T)]; do_encode([H|T]) when H&gt;=$A, H=&lt;$Z -&gt; [H| encode(T)]; do_encode([H|T]) when H&gt;=$0, H=&lt;$9 -&gt; [H| encode(T)]; do_encode([H|T]) when H==$- -&gt; [H| encode(T)]; do_encode([H|T]) when H==$. -&gt; [H|do_encode(T)]; do_encode([H|T]) when H==$* -&gt; [H|do_encode(T)]; do_encode([H|T]) -&gt; to_hex(H) ++ encode(T). hex(N) when N &lt; 10 -&gt; $0+N; hex(N) when N &gt;= 10, N &lt; 16 -&gt; $a+(N-10). to_hex(N) when N &lt; 256 -&gt; [$%, hex(N div 16), hex(N rem 16)]. </code></pre> <p>Is the function above wrong? I'm a kind of a newbie when it comes to raw-data handling. so help/ideas are much appreciated! Thanks!</p>
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