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/* Lossless_UDP.h
*
* An implementation of the Lossless_UDP protocol as seen in docs/Lossless_UDP.txt
*
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
/* Functions */
/* initialize a new connection to ip_port
returns an integer corresponding to the connection id.
return -1 if it could not initialize the connection.
if there already was an existing connection to that ip_port return its number. */
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 integer 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();
/* 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();
/* if we receive a Lossless_UDP packet we 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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