/***************************************************************************
 *   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 "pack.h"
#include <arpa/inet.h>
#include <util/error.h>
#include <util/functions.h>

using namespace bt;
using namespace KNetwork;

namespace dht
{

	void PackBucketEntry(const KBucketEntry & e,QByteArray & ba,Uint32 off)
	{
		const KInetSocketAddress & addr = e.getAddress();
		Uint8* data = (Uint8*)ba.data();
		Uint8* ptr = data + off;
		
		if (addr.ipVersion() == 4)
		{
			// first check size
			if ((int) off + 26 > ba.size())
				throw bt::Error("Not enough room in buffer");
			
			// copy ID, IP address and port into the buffer
			memcpy(ptr,e.getID().getData(),20);
			bt::WriteUint32(ptr,20,ntohl(addr.ipAddress().IPv4Addr()));
			bt::WriteUint16(ptr,24,addr.port());
		}
		else
		{
			// first check size
			if ((int) off + 38 > ba.size())
				throw bt::Error("Not enough room in buffer");
			
			// copy ID, IP address and port into the buffer
			memcpy(ptr,e.getID().getData(),20);
			memcpy(ptr + 20,addr.ipAddress().addr(),16);
			bt::WriteUint16(ptr,36,addr.port());
		}
	}
	
	KBucketEntry UnpackBucketEntry(const QByteArray & ba,Uint32 off,int ip_version)
	{
		if (ip_version == 4)
		{
			if ((int) off + 26 > ba.size())
				throw bt::Error("Not enough room in buffer");
			
			const Uint8* data = (Uint8*)ba.data();
			const Uint8* ptr = data + off;
			
			// get the port, ip and key);
			Uint16 port = bt::ReadUint16(ptr,24);
			Uint8 key[20];
			memcpy(key,ptr,20);
			
			return KBucketEntry(KInetSocketAddress(KIpAddress(ptr+20,4),port),dht::Key(key));
		}
		else
		{
			if ((int) off + 38 > ba.size())
				throw bt::Error("Not enough room in buffer");
			
			const Uint8* data = (Uint8*)ba.data();
			const Uint8* ptr = data + off;
			
			// get the port, ip and key);
			Uint16 port = bt::ReadUint16(ptr,36);
			Uint8 key[20];
			memcpy(key,ptr,20);
			
			return KBucketEntry(KInetSocketAddress(KIpAddress(ptr+20,6),port),dht::Key(key));
		}
	}

}
