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diff --git a/src/DefaultExtensionMessageFactory.cc b/src/DefaultExtensionMessageFactory.cc
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+++ b/src/DefaultExtensionMessageFactory.cc
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+/* <!-- copyright */
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2006 Tatsuhiro Tsujikawa
+ *
+ * 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
+ *
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of portions of this program with the
+ * OpenSSL library under certain conditions as described in each
+ * individual source file, and distribute linked combinations
+ * including the two.
+ * You must obey the GNU General Public License in all respects
+ * for all of the code used other than OpenSSL.  If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so.  If you
+ * do not wish to do so, delete this exception statement from your
+ * version.  If you delete this exception statement from all source
+ * files in the program, then also delete it here.
+ */
+/* copyright --> */
+#include "DefaultExtensionMessageFactory.h"
+#include "BtContext.h"
+#include "Peer.h"
+#include "DlAbortEx.h"
+#include "HandshakeExtensionMessage.h"
+#include "UTPexExtensionMessage.h"
+#include "LogFactory.h"
+#include "BtRegistry.h"
+
+DefaultExtensionMessageFactory::DefaultExtensionMessageFactory():
+  _btContext(0),
+  _peer(0),
+  _logger(LogFactory::getInstance()) {}
+
+DefaultExtensionMessageFactory::DefaultExtensionMessageFactory(const BtContextHandle& btContext,
+							       const PeerHandle& peer):
+  _btContext(btContext),
+  _peer(peer),
+  _logger(LogFactory::getInstance()) {}
+
+DefaultExtensionMessageFactory::~DefaultExtensionMessageFactory() {}
+
+ExtensionMessageHandle
+DefaultExtensionMessageFactory::createMessage(const char* data, size_t length)
+{
+  uint8_t extensionMessageID = *data;
+  if(extensionMessageID == 0) {
+    // handshake
+    HandshakeExtensionMessageHandle m = HandshakeExtensionMessage::create(data, length);
+    m->setBtContext(_btContext);
+    m->setPeer(_peer);
+    return m;
+  } else {
+    string extensionName = BT_RUNTIME(_btContext)->getExtensionName(extensionMessageID);
+    if(extensionName.empty()) {
+      throw new DlAbortEx("No extension registered for extended message ID %u",
+			  extensionMessageID);
+    }
+    if(extensionName == "ut_pex") {
+      // uTorrent compatible Peer-Exchange
+      UTPexExtensionMessageHandle m =
+	UTPexExtensionMessage::create(_btContext, data, length);
+      m->setBtContext(_btContext);
+      return m;
+    } else {
+      throw new DlAbortEx("Unsupported extension message received. extensionMessageID=%u, extensionName=%s", extensionMessageID, extensionName.c_str());
+    }
+  }
+}
+
+void DefaultExtensionMessageFactory::setBtContext(const BtContextHandle& btContext)
+{
+  _btContext = btContext;
+}
+
+void DefaultExtensionMessageFactory::setPeer(const PeerHandle& peer)
+{
+  _peer = peer;
+}