ref: 5b3b1bbab6c49148b9309d0a9de0ef33e1a63513
dir: /src/net_loop.c/
// // Copyright(C) 2005-2014 Simon Howard // // 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. // // DESCRIPTION: // Loopback network module for server compiled into the client // #include <stdio.h> #include <stdlib.h> #include "doomtype.h" #include "i_system.h" #include "m_misc.h" #include "net_defs.h" #include "net_loop.h" #include "net_packet.h" #define MAX_QUEUE_SIZE 16 typedef struct { net_packet_t *packets[MAX_QUEUE_SIZE]; int head, tail; } packet_queue_t; static packet_queue_t client_queue; static packet_queue_t server_queue; static net_addr_t client_addr; static net_addr_t server_addr; static void QueueInit(packet_queue_t *queue) { queue->head = queue->tail = 0; } static void QueuePush(packet_queue_t *queue, net_packet_t *packet) { int new_tail; new_tail = (queue->tail + 1) % MAX_QUEUE_SIZE; if (new_tail == queue->head) { // queue is full return; } queue->packets[queue->tail] = packet; queue->tail = new_tail; } static net_packet_t *QueuePop(packet_queue_t *queue) { net_packet_t *packet; if (queue->tail == queue->head) { // queue empty return NULL; } packet = queue->packets[queue->head]; queue->head = (queue->head + 1) % MAX_QUEUE_SIZE; return packet; } //----------------------------------------------------------------------------- // // Client end code // //----------------------------------------------------------------------------- static boolean NET_CL_InitClient(void) { QueueInit(&client_queue); return true; } static boolean NET_CL_InitServer(void) { I_Error("NET_CL_InitServer: attempted to initialize client pipe end as a server!"); return false; } static void NET_CL_SendPacket(net_addr_t *addr, net_packet_t *packet) { QueuePush(&server_queue, NET_PacketDup(packet)); } static boolean NET_CL_RecvPacket(net_addr_t **addr, net_packet_t **packet) { net_packet_t *popped; popped = QueuePop(&client_queue); if (popped != NULL) { *packet = popped; *addr = &client_addr; client_addr.module = &net_loop_client_module; return true; } return false; } static void NET_CL_AddrToString(net_addr_t *addr, char *buffer, int buffer_len) { M_snprintf(buffer, buffer_len, "local server"); } static void NET_CL_FreeAddress(net_addr_t *addr) { } static net_addr_t *NET_CL_ResolveAddress(const char *address) { if (address == NULL) { client_addr.module = &net_loop_client_module; return &client_addr; } else { return NULL; } } net_module_t net_loop_client_module = { NET_CL_InitClient, NET_CL_InitServer, NET_CL_SendPacket, NET_CL_RecvPacket, NET_CL_AddrToString, NET_CL_FreeAddress, NET_CL_ResolveAddress, }; //----------------------------------------------------------------------------- // // Server end code // //----------------------------------------------------------------------------- static boolean NET_SV_InitClient(void) { I_Error("NET_SV_InitClient: attempted to initialize server pipe end as a client!"); return false; } static boolean NET_SV_InitServer(void) { QueueInit(&server_queue); return true; } static void NET_SV_SendPacket(net_addr_t *addr, net_packet_t *packet) { QueuePush(&client_queue, NET_PacketDup(packet)); } static boolean NET_SV_RecvPacket(net_addr_t **addr, net_packet_t **packet) { net_packet_t *popped; popped = QueuePop(&server_queue); if (popped != NULL) { *packet = popped; *addr = &server_addr; server_addr.module = &net_loop_server_module; return true; } return false; } static void NET_SV_AddrToString(net_addr_t *addr, char *buffer, int buffer_len) { M_snprintf(buffer, buffer_len, "local client"); } static void NET_SV_FreeAddress(net_addr_t *addr) { } static net_addr_t *NET_SV_ResolveAddress(const char *address) { if (address == NULL) { server_addr.module = &net_loop_server_module; return &server_addr; } else { return NULL; } } net_module_t net_loop_server_module = { NET_SV_InitClient, NET_SV_InitServer, NET_SV_SendPacket, NET_SV_RecvPacket, NET_SV_AddrToString, NET_SV_FreeAddress, NET_SV_ResolveAddress, };