create separate function for reading a node from a list

include/libtorrent/Makefile.am

@@ -194,6 +194,7 @@ nobase_include_HEADERS = \
   kademlia/direct_request.hpp       \
   kademlia/dos_blocker.hpp          \
   kademlia/find_data.hpp            \
+  kademlia/io.hpp                   \
   kademlia/put_data.hpp             \
   kademlia/msg.hpp                  \
   kademlia/node.hpp                 \

include/libtorrent/kademlia/io.hpp

@@ -0,0 +1,64 @@
+/*
+
+Copyright (c) 2006-2016, Arvid Norberg, Steven Siloti
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+* Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+* Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in
+the documentation and/or other materials provided with the distribution.
+* Neither the name of the author nor the names of its
+contributors may be used to endorse or promote products derived
+from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+
+*/
+
+#ifndef KADEMLIA_IO_HPP
+#define KADEMLIA_IO_HPP
+
+#include "libtorrent/kademlia/node_id.hpp"
+#include "libtorrent/socket_io.hpp"
+
+namespace libtorrent { namespace dht {
+
+	struct node_endpoint
+	{
+		node_id id;
+		udp::endpoint ep;
+	};
+
+	template<class InIt>
+	node_endpoint read_node_endpoint(udp protocol, InIt&& in)
+	{
+		node_endpoint ep;
+		std::copy(in, in + 20, ep.id.begin());
+		in += 20;
+#if TORRENT_USE_IPV6
+		if (protocol == udp::v6())
+			ep.ep = detail::read_v6_endpoint<udp::endpoint>(in);
+		else
+#endif
+			ep.ep = detail::read_v4_endpoint<udp::endpoint>(in);
+		return ep;
+	}
+
+}}
+
+#endif

src/kademlia/node.cpp

@@ -55,6 +55,7 @@ POSSIBILITY OF SUCH DAMAGE.
 #include "libtorrent/kademlia/node.hpp"
 #include "libtorrent/kademlia/dht_observer.hpp"
 #include "libtorrent/kademlia/direct_request.hpp"
+#include "libtorrent/kademlia/io.hpp"
 
 #include "libtorrent/kademlia/refresh.hpp"
 #include "libtorrent/kademlia/get_peers.hpp"
@@ -609,17 +610,8 @@ struct ping_observer : observer
 
 			while (end - nodes >= 20 + protocol_size + 2)
 			{
-				node_id id;
-				std::copy(nodes, nodes + 20, id.begin());
-				nodes += 20;
-				udp::endpoint ep;
-#if TORRENT_USE_IPV6
-				if (protocol == udp::v6())
-					ep = detail::read_v6_endpoint<udp::endpoint>(nodes);
-				else
-#endif
-					ep = detail::read_v4_endpoint<udp::endpoint>(nodes);
-				algorithm()->get_node().m_table.heard_about(id, ep);
+				node_endpoint nep = read_node_endpoint(protocol, nodes);
+				algorithm()->get_node().m_table.heard_about(nep.id, nep.ep);
 			}
 		}
 	}

src/kademlia/traversal_algorithm.cpp

@@ -34,6 +34,7 @@ POSSIBILITY OF SUCH DAMAGE.
 #include <libtorrent/kademlia/rpc_manager.hpp>
 #include <libtorrent/kademlia/node.hpp>
 #include <libtorrent/kademlia/dht_observer.hpp> // for dht_logger
+#include <libtorrent/kademlia/io.hpp>
 #include <libtorrent/session_status.hpp>
 #include <libtorrent/socket_io.hpp> // for read_*_endpoint
 #include <libtorrent/alert_types.hpp> // for dht_lookup
@@ -601,17 +602,8 @@ void traversal_observer::reply(msg const& m)
 
 		while (end - nodes >= 20 + protocol_size + 2)
 		{
-			node_id id;
-			std::copy(nodes, nodes + 20, id.begin());
-			nodes += 20;
-			udp::endpoint ep;
-#if TORRENT_USE_IPV6
-			if (protocol == udp::v6())
-				ep = detail::read_v6_endpoint<udp::endpoint>(nodes);
-			else
-#endif
-				ep = detail::read_v4_endpoint<udp::endpoint>(nodes);
-			algorithm()->traverse(id, ep);
+			node_endpoint nep = read_node_endpoint(protocol, nodes);
+			algorithm()->traverse(nep.id, nep.ep);
 		}
 	}