serious anti wall sticking protection for hedgewars
/* * Hedgewars, a free turn based strategy game * Copyright (C) 2012 Simeon Maxein <smaxein@googlemail.com> * * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *//* * Low-level protocol support for the IPC connection to the engine. */#ifndef IPCBASE_H_#define IPCBASE_H_#include <stddef.h>#include <stdbool.h>#include <stdint.h>#define IPCBASE_MAPMSG_BYTES 4097typedef enum {IPC_NOT_CONNECTED, IPC_LISTENING, IPC_CONNECTED} IpcState;typedef struct _flib_ipcbase flib_ipcbase;/** * Start an engine connection by listening on a random port. The selected port can * be queried with flib_ipcbase_port and has to be passed to the engine. * * Returns NULL on error. Destroy the created object with flib_ipcbase_destroy. * * We stop accepting new connections once a connection has been established, so you * need to create a new ipcbase in order to start a new connection. */flib_ipcbase *flib_ipcbase_create();/** * Return the listening port */uint16_t flib_ipcbase_port(flib_ipcbase *ipc);/** * Free resources and close sockets. NULL safe. */void flib_ipcbase_destroy(flib_ipcbase *ipc);/** * Determine the current connection state */IpcState flib_ipcbase_state(flib_ipcbase *ipc);/** * Receive a single message (up to 256 bytes) and copy it into the data buffer. * Returns the length of the received message, a negative value if no message could * be read. * * The first byte of a message is its content length, which is one less than the returned * value. * * Note: When a connection is closed, you probably want to call this function until * no further message is returned, to ensure you see all messages that were sent * before the connection closed. */int flib_ipcbase_recv_message(flib_ipcbase *ipc, void *data);/** * Try to receive 4097 bytes. This is the size of the reply the engine sends * when successfully queried for map data. The first 4096 bytes are a bit-packed * twocolor image of the map (256x128), the last byte is the number of hogs that * fit on the map. */int flib_ipcbase_recv_map(flib_ipcbase *ipc, void *data);/** * Blocking send bytes over the socket. No message framing will be added. * Returns 0 on success. */int flib_ipcbase_send_raw(flib_ipcbase *ipc, const void *data, size_t len);/** * Write a single message (up to 255 bytes) to the engine. This call blocks until the * message is completely written or the connection is closed or an error occurs. * * Calling this function in a state other than IPC_CONNECTED will fail immediately. * Returns 0 on success. */int flib_ipcbase_send_message(flib_ipcbase *ipc, void *data, size_t len);/** * Try to accept a connection. Only has an effect in state IPC_LISTENING. */void flib_ipcbase_accept(flib_ipcbase *ipc);#endif /* IPCBASE_H_ */