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/*
* Copyright 2006 Serge van den Boom <svdb@stack.nl>
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#define NETCONNECTION_INTERNAL
#include "netplay.h"
#include "netconnection.h"
#include "packetq.h"
#include "netsend.h"
#include "packetsenders.h"
#ifdef NETPLAY_DEBUG
# include "libs/log.h"
#endif
#include <errno.h>
#include <stdlib.h>
#include <string.h>
static inline PacketQueueLink *
PacketQueueLink_alloc(void) {
// XXX: perhaps keep a pool of links?
return malloc(sizeof (PacketQueueLink));
}
static inline void
PacketQueueLink_delete(PacketQueueLink *link) {
free(link);
}
// 'maxSize' should at least be 1
void
PacketQueue_init(PacketQueue *queue) {
queue->size = 0;
queue->first = NULL;
queue->end = &queue->first;
}
static void
PacketQueue_deleteLinks(PacketQueueLink *link) {
while (link != NULL) {
PacketQueueLink *next = link->next;
Packet_delete(link->packet);
PacketQueueLink_delete(link);
link = next;
}
}
void
PacketQueue_uninit(PacketQueue *queue) {
PacketQueue_deleteLinks(queue->first);
}
void
queuePacket(NetConnection *conn, Packet *packet) {
PacketQueue *queue;
PacketQueueLink *link;
assert(NetConnection_isConnected(conn));
queue = &conn->queue;
link = PacketQueueLink_alloc();
link->packet = packet;
link->next = NULL;
*queue->end = link;
queue->end = &link->next;
queue->size++;
// XXX: perhaps check that this queue isn't getting too large?
#ifdef NETPLAY_DEBUG
if (packetType(packet) != PACKET_BATTLEINPUT &&
packetType(packet) != PACKET_CHECKSUM) {
// Reporting BattleInput or Checksum would get so spammy that it
// would slow down the battle.
log_add(log_Debug, "NETPLAY: [%d] ==> Queueing packet of type %s.\n",
NetConnection_getPlayerNr(conn),
packetTypeData[packetType(packet)].name);
}
#ifdef NETPLAY_DEBUG_FILE
if (conn->debugFile != NULL) {
uio_fprintf(conn->debugFile,
"NETPLAY: [%d] ==> Queueing packet of type %s.\n",
NetConnection_getPlayerNr(conn),
packetTypeData[packetType(packet)].name);
}
#endif /* NETPLAY_DEBUG_FILE */
#endif /* NETPLAY_DEBUG */
}
// If an error occurs during sending, we leave the unsent packets in
// the queue, and let the caller decide what to do with them.
// This function may return -1 with errno EAGAIN or EWOULDBLOCK
// if we're waiting for the other party to act first.
static int
flushPacketQueueLinks(NetConnection *conn, PacketQueueLink **first) {
PacketQueueLink *link;
PacketQueueLink *next;
PacketQueue *queue = &conn->queue;
for (link = *first; link != NULL; link = next) {
if (sendPacket(conn, link->packet) == -1) {
// Errno is set.
*first = link;
return -1;
}
next = link->next;
Packet_delete(link->packet);
PacketQueueLink_delete(link);
queue->size--;
}
*first = link;
return 0;
}
int
flushPacketQueue(NetConnection *conn) {
int flushResult;
PacketQueue *queue = &conn->queue;
assert(NetConnection_isConnected(conn));
flushResult = flushPacketQueueLinks(conn, &queue->first);
if (queue->first == NULL)
queue->end = &queue->first;
if (flushResult == -1) {
// errno is set
return -1;
}
return 0;
}
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