src/network.h

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2016 Mike Becker. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 */

#ifndef TCHESS_NETWORK_H
#define	TCHESS_NETWORK_H

#include <sys/socket.h>
#include <stdint.h>

#ifdef	__cplusplus
extern "C" {
#endif
    
#define NETCODE_ACCEPT 0x02
#define NETCODE_DECLINE 0x04
#define NETCODE_DECLINE_MOVE 0x05
#define NETCODE_GAMEINFO 0x10
#define NETCODE_PGNDATA 0x11
#define NETCODE_MOVE 0x20
#define NETCODE_CHECKMATE 0x23
#define NETCODE_STALEMATE 0x28
#define NETCODE_NOMATERIAL 0x29
#define NETCODE_THREEFOLD 0x30
#define NETCODE_RESIGN 0x41
#define NETCODE_REMIS 0x42
#define NETCODE_TAUNT 0x43
#define NETCODE_TIMEOVER 0x44
#define NETCODE_AGAIN 0x70
#define NETCODE_CONNLOST 0x80
#define NETCODE_ERROR 0xFF

#define NETCODE_VERSION 24

typedef struct {
    int fd; /* -1, if we are the client */
    struct sockaddr address;
    socklen_t address_len;
} Client;

typedef struct {
    int fd;
    struct addrinfo* info; /* NULL, if we are the server */
    Client *client;
} Server;

typedef struct {
    uint8_t servercolor;
    uint8_t timecontrol;
    uint16_t time;
    uint16_t addtime;
    uint16_t delay;
} NetGameInfo;

typedef struct {
    uint32_t mtime_sec;
    uint32_t mtime_usec;
    uint8_t piece;
    uint8_t fromfile;
    uint8_t fromrow;
    uint8_t tofile;
    uint8_t torow;
    uint8_t capture;
    uint8_t check_or_mate;
    uint8_t promotion;
} NetMove;

int net_create_tcp(Server *server, short port);
int net_find_tcp(Server *server, char* host, short port);

int net_create_sock(Server *server, char *path);
int net_find_sock(Server *server, char* path);

int net_listen(Server *server);
void net_destroy(Server *server);
int net_connect(Server *server);

void net_send_code(int socket, uint8_t code);
void net_send_data(int socket, uint8_t code, void *data, size_t len);
uint8_t net_recieve_code(int socket);
uint8_t net_recieve_code_async(int socket);
void net_recieve_data(int socket, void *data, size_t len);


/* Functions that convert WORD and DWORD values to terminal-chess
 * network protocol byte order.
 *
 * Note: due to the vast majority of processors using little-endian,
 * the network byte order of terminal-chess is little-endian, too.
 * While the standard network byte order is big-endian for historic reasons.
 */

static inline uint16_t net_htons(uint16_t s) {
#if defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
    return s;
#else
#if !defined(__BYTE_ORDER__)
    const uint16_t endian_test = 1;
    if (*(const uint8_t *)&endian_test) {
        return s;
    }
#endif
    return (uint16_t)((s >> 8) | (s << 8));
#endif
}

static inline uint16_t net_ntohs(uint16_t s) {
    return net_htons(s);
}

static inline uint32_t net_ntohl(uint32_t l) {
#if defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
    return l;
#else
#if !defined(__BYTE_ORDER__)
    const uint16_t endian_test = 1;
    if (*(const uint8_t *)&endian_test) {
        return l;
    }
#endif
    return ((l & 0x000000FFu) << 24)
         | ((l & 0x0000FF00u) << 8)
         | ((l & 0x00FF0000u) >> 8)
         | ((l & 0xFF000000u) >> 24);
#endif
}

static inline uint32_t net_htonl(uint32_t l) {
    return net_ntohl(l);
}

#ifdef	__cplusplus
}
#endif

#endif	/* TCHESS_NETWORK_H */