This is an I2P port of snark [http://klomp.org/snark], a GPL'ed bittorrent client

The build in tracker has been removed for simplicity.

Example usage:
  java -jar lib/i2psnark.jar myFile.torrent

or, a more verbose setting:
  java -jar lib/i2psnark.jar --eepproxy 127.0.0.1 4444 \
       --i2cp 127.0.0.1 7654 "inbound.length=2 outbound.length=2" \
       --debug 6 myFile.torrent

apps/i2psnark/java/src/org/klomp/snark/TrackerInfo.java

@@ -0,0 +1,128 @@
+/* TrackerInfo - Holds information returned by a tracker, mainly the peer list.
+   Copyright (C) 2003 Mark J. Wielaard
+
+   This file is part of Snark.
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+ 
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+ 
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+*/
+
+package org.klomp.snark;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.math.BigInteger;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.HashSet;
+
+import org.klomp.snark.bencode.*;
+
+public class TrackerInfo
+{
+  private final String failure_reason;
+  private final int interval;
+  private final Set peers;
+
+  public TrackerInfo(InputStream in, byte[] my_id, MetaInfo metainfo)
+    throws IOException
+  {
+    this(new BDecoder(in), my_id, metainfo);
+  }
+
+  public TrackerInfo(BDecoder be, byte[] my_id, MetaInfo metainfo)
+    throws IOException
+  {
+    this(be.bdecodeMap().getMap(), my_id, metainfo);
+  }
+
+  public TrackerInfo(Map m, byte[] my_id, MetaInfo metainfo)
+    throws IOException
+  {
+    BEValue reason = (BEValue)m.get("failure reason");
+    if (reason != null)
+      {
+        failure_reason = reason.getString();
+        interval = -1;
+        peers = null;
+      }
+    else
+      {
+        failure_reason = null;
+        BEValue beInterval = (BEValue)m.get("interval");
+        if (beInterval == null)
+          throw new InvalidBEncodingException("No interval given");
+        else
+          interval = beInterval.getInt();
+        BEValue bePeers = (BEValue)m.get("peers");
+        if (bePeers == null)
+          throw new InvalidBEncodingException("No peer list");
+        else
+          peers = getPeers(bePeers.getList(), my_id, metainfo);
+      }
+  }
+
+  public static Set getPeers(InputStream in, byte[] my_id, MetaInfo metainfo)
+    throws IOException
+  {
+    return getPeers(new BDecoder(in), my_id, metainfo);
+  }
+
+  public static Set getPeers(BDecoder be, byte[] my_id, MetaInfo metainfo)
+    throws IOException
+  {
+    return getPeers(be.bdecodeList().getList(), my_id, metainfo);
+  }
+
+  public static Set getPeers(List l, byte[] my_id, MetaInfo metainfo)
+    throws IOException
+  {
+    Set peers = new HashSet(l.size());
+
+    Iterator it = l.iterator();
+    while (it.hasNext())
+      {
+        PeerID peerID = new PeerID(((BEValue)it.next()).getMap());
+        peers.add(new Peer(peerID, my_id, metainfo));
+      }
+
+    return peers;
+  }
+
+  public Set getPeers()
+  {
+    return peers;
+  }
+
+  public String getFailureReason()
+  {
+    return failure_reason;
+  }
+
+  public int getInterval()
+  {
+    return interval;
+  }
+
+  public String toString()
+  {
+    if (failure_reason != null)
+      return "TrackerInfo[FAILED: " + failure_reason + "]";
+    else
+      return "TrackerInfo[interval=" + interval
+        + ", peers=" + peers + "]";
+  }
+}