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/* Lossless_UDP.h
*
* An implementation of the Lossless_UDP protocol as seen in http://wiki.tox.im/index.php/Lossless_UDP
*
* Copyright (C) 2013 Tox project All Rights Reserved.
*
* This file is part of Tox.
*
* Tox 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 3 of the License, or
* (at your option) any later version.
*
* Tox 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 Tox. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef LOSSLESS_UDP_H
#define LOSSLESS_UDP_H
#include "network.h"
#ifdef __cplusplus
extern "C" {
#endif
/* maximum length of the data in the data packets */
#define MAX_DATA_SIZE 1024
/*
* Initialize a new connection to ip_port
* Returns an integer corresponding to the connection id.
* Return -1 if it could not initialize the connection.
* Return number if there already was an existing connection to that ip_port.
*/
int new_connection(IP_Port ip_port);
/*
* Get connection id from IP_Port.
* Return -1 if there are no connections like we are looking for.
* Return id if it found it .
*/
int getconnection_id(IP_Port ip_port);
/*
* Returns an int corresponding to the next connection in our imcoming connection list
* Return -1 if there are no new incoming connections in the list.
*/
int incoming_connection(void);
/*
* Return -1 if it could not kill the connection.
* Return 0 if killed successfully
*/
int kill_connection(int connection_id);
/*
* Kill connection in seconds seconds.
* Return -1 if it can not kill the connection.
* Return 0 if it will kill it
*/
int kill_connection_in(int connection_id, uint32_t seconds);
/*
* Returns the ip_port of the corresponding connection.
* Return 0 if there is no such connection.
*/
IP_Port connection_ip(int connection_id);
/*
* Returns the id of the next packet in the queue
* Return -1 if no packet in queue
*/
char id_packet(int connection_id);
/*
* Return 0 if there is no received data in the buffer.
* Return length of received packet if successful
*/
int read_packet(int connection_id, uint8_t *data);
/*
* Return 0 if data could not be put in packet queue
* Return 1 if data was put into the queue
*/
int write_packet(int connection_id, uint8_t *data, uint32_t length);
/* Returns the number of packets in the queue waiting to be successfully sent. */
uint32_t sendqueue(int connection_id);
/*
* returns the number of packets in the queue waiting to be successfully
* read with read_packet(...)
*/
uint32_t recvqueue(int connection_id);
/* Check if connection is connected:
* Return 0 no.
* Return 1 if attempting handshake.
* Return 2 if handshake is done.
* Return 3 if fully connected.
* Return 4 if timed out and wating to be killed.
*/
int is_connected(int connection_id);
/* Call this function a couple times per second It's the main loop. */
void doLossless_UDP(void);
/*
* If we receive a Lossless_UDP packet, call this function so it can be handled.
* Return 0 if packet is handled correctly.
* Return 1 if it didn't handle the packet or if the packet was shit.
*/
int LosslessUDP_handlepacket(uint8_t *packet, uint32_t length, IP_Port source);
#ifdef __cplusplus
}
#endif
#endif
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