src/network/connection.h


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/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser 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.
*/

#pragma once

#include "irrlichttypes_bloated.h"
#include "peerhandler.h"
#include "socket.h"
#include "constants.h"
#include "util/pointer.h"
#include "util/container.h"
#include "util/thread.h"
#include "util/numeric.h"
#include "networkprotocol.h"
#include <iostream>
#include <fstream>
#include <vector>
#include <map>

class NetworkPacket;

namespace con
{

class ConnectionReceiveThread;
class ConnectionSendThread;

typedef enum MTProtocols {
	MTP_PRIMARY,
	MTP_UDP,
	MTP_MINETEST_RELIABLE_UDP
} MTProtocols;

#define MAX_UDP_PEERS 65535

#define SEQNUM_MAX 65535

inline bool seqnum_higher(u16 totest, u16 base)
{
	if (totest > base)
	{
		if ((totest - base) > (SEQNUM_MAX/2))
			return false;

		return true;
	}

	if ((base - totest) > (SEQNUM_MAX/2))
		return true;

	return false;
}

inline bool seqnum_in_window(u16 seqnum, u16 next,u16 window_size)
{
	u16 window_start = next;
	u16 window_end   = ( next + window_size ) % (SEQNUM_MAX+1);

	if (window_start < window_end) {
		return ((seqnum >= window_start) && (seqnum < window_end));
	}


	return ((seqnum < window_end) || (seqnum >= window_start));
}

static inline float CALC_DTIME(u64 lasttime, u64 curtime)
{
	float value = ( curtime - lasttime) / 1000.0;
	return MYMAX(MYMIN(value,0.1),0.0);
}

struct BufferedPacket
{
	BufferedPacket(u8 *a_data, u32 a_size):
		data(a_data, a_size)
	{}
	BufferedPacket(u32 a_size):
		data(a_size)
	{}
	Buffer<u8> data; // Data of the packet, including headers
	float time = 0.0f; // Seconds from buffering the packet or re-sending
	float totaltime = 0.0f; // Seconds from buffering the packet
	u64 absolute_send_time = -1;
	Address address; // Sender or destination
	unsigned int resend_count = 0;
};

// This adds the base headers to the data and makes a packet out of it
BufferedPacket makePacket(Address &address, const SharedBuffer<u8> &data,
		u32 protocol_id, session_t sender_peer_id, u8 channel);

// Depending on size, make a TYPE_ORIGINAL or TYPE_SPLIT packet
// Increments split_seqnum if a split packet is made
void makeAutoSplitPacket(const SharedBuffer<u8> &data, u32 chunksize_max,
		u16 &split_seqnum, std::list<SharedBuffer<u8>> *list);

// Add the TYPE_RELIABLE header to the data
SharedBuffer<u8> makeReliablePacket(const SharedBuffer<u8> &data, u16 seqnum);

struct IncomingSplitPacket
{