project_files/frontlib/ipc/ipcbase.h
author nemo
Mon, 11 Mar 2013 12:21:37 -0400
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/*
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 * Hedgewars, a free turn based strategy game
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 * Copyright (C) 2012 Simeon Maxein <smaxein@googlemail.com>
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 *
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 * This program is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2
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 * of the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
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 */
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/*
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 * Low-level protocol support for the IPC connection to the engine.
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 */
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#ifndef IPCBASE_H_
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#define IPCBASE_H_
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#include <stddef.h>
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#include <stdbool.h>
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#include <stdint.h>
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#define IPCBASE_MAPMSG_BYTES 4097
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typedef enum {IPC_NOT_CONNECTED, IPC_LISTENING, IPC_CONNECTED} IpcState;
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typedef struct _flib_ipcbase flib_ipcbase;
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/**
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 * Start an engine connection by listening on a random port. The selected port can
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 * be queried with flib_ipcbase_port and has to be passed to the engine.
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 *
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 * Returns NULL on error. Destroy the created object with flib_ipcbase_destroy.
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 *
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 * We stop accepting new connections once a connection has been established, so you
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 * need to create a new ipcbase in order to start a new connection.
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 */
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flib_ipcbase *flib_ipcbase_create();
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/**
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 * Return the listening port
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 */
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uint16_t flib_ipcbase_port(flib_ipcbase *ipc);
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/**
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 * Free resources and close sockets. NULL safe.
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 */
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void flib_ipcbase_destroy(flib_ipcbase *ipc);
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/**
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 * Determine the current connection state
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 */
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IpcState flib_ipcbase_state(flib_ipcbase *ipc);
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/**
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 * Receive a single message (up to 256 bytes) and copy it into the data buffer.
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 * Returns the length of the received message, a negative value if no message could
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 * be read.
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 *
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 * The first byte of a message is its content length, which is one less than the returned
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 * value.
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 *
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 * Note: When a connection is closed, you probably want to call this function until
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 * no further message is returned, to ensure you see all messages that were sent
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 * before the connection closed.
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 */
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int flib_ipcbase_recv_message(flib_ipcbase *ipc, void *data);
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/**
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 * Try to receive 4097 bytes. This is the size of the reply the engine sends
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 * when successfully queried for map data. The first 4096 bytes are a bit-packed
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 * twocolor image of the map (256x128), the last byte is the number of hogs that
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 * fit on the map.
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 */
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int flib_ipcbase_recv_map(flib_ipcbase *ipc, void *data);
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/**
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 * Blocking send bytes over the socket. No message framing will be added.
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 * Returns 0 on success.
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 */
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int flib_ipcbase_send_raw(flib_ipcbase *ipc, const void *data, size_t len);
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/**
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 * Write a single message (up to 255 bytes) to the engine. This call blocks until the
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 * message is completely written or the connection is closed or an error occurs.
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 *
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 * Calling this function in a state other than IPC_CONNECTED will fail immediately.
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 * Returns 0 on success.
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 */
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int flib_ipcbase_send_message(flib_ipcbase *ipc, void *data, size_t len);
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/**
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 * Try to accept a connection. Only has an effect in state IPC_LISTENING.
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 */
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void flib_ipcbase_accept(flib_ipcbase *ipc);
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#endif /* IPCBASE_H_ */
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