1 files changed, 84 insertions, 0 deletions
diff --git a/libktorrent/kademlia/kclosestnodessearch.cpp b/libktorrent/kademlia/kclosestnodessearch.cpp
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+++ b/libktorrent/kademlia/kclosestnodessearch.cpp
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+/***************************************************************************
+ *   Copyright (C) 2005 by Joris Guisson                                   *
+ *   joris.guisson@gmail.com                                               *
+ *                                                                         *
+ *   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 of the License, 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.,                                       *
+ *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.             *
+ ***************************************************************************/
+#include <util/functions.h>
+#include "kclosestnodessearch.h"
+#include "pack.h"
+
+using namespace bt;
+using namespace KNetwork;
+
+namespace dht
+{
+	typedef std::map<dht::Key,KBucketEntry>::iterator KNSitr;
+
+	KClosestNodesSearch::KClosestNodesSearch(const dht::Key & key,Uint32 max_entries) 
+	: key(key),max_entries(max_entries)
+	{}
+
+
+	KClosestNodesSearch::~KClosestNodesSearch()
+	{}
+
+	
+	void KClosestNodesSearch::tryInsert(const KBucketEntry & e)
+	{
+		// calculate distance between key and e
+		dht::Key d = dht::Key::distance(key,e.getID());
+		
+		if (emap.size() < max_entries)
+		{
+			// room in the map so just insert
+			emap.insert(std::make_pair(d,e));
+		}
+		else
+		{
+			// now find the max distance
+			// seeing that the last element of the map has also 
+			// the biggest distance to key (std::map is sorted on the distance)
+			// we just take the last
+			const dht::Key & max = emap.rbegin()->first;
+			if (d < max)
+			{
+				// insert if d is smaller then max
+				emap.insert(std::make_pair(d,e));
+				// erase the old max value
+				emap.erase(max);
+			}
+		}
+		
+	}
+	
+	void KClosestNodesSearch::pack(QByteArray & ba)
+	{
+		// make sure we do not writ to much
+		Uint32 max_items = ba.size() / 26;
+		Uint32 j = 0;
+		
+		KNSitr i = emap.begin();
+		while (i != emap.end() && j < max_items)
+		{
+			PackBucketEntry(i->second,ba,j*26);
+			i++;
+			j++;
+			i++;
+		}
+	}
+
+}