path: root/src/net/protocol.cpp

/*
 *  The Mana World
 *  Copyright 2004 The Mana World Development Team
 *
 *  This file is part of The Mana World.
 *
 *  The Mana World 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
 *  any later version.
 *
 *  The Mana World 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 The Mana World; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  $Id$
 */

#include "protocol.h"

#define LOBYTE(w)  ((unsigned char)(w))
#define HIBYTE(w)  ((unsigned char)(((unsigned short)(w)) >> 8))

unsigned char get_src_direction(char data)
{
    data >>= 4;
    return data;
}

unsigned char get_dest_direction(char data)
{
    return data & 0x000f;
}

void set_coordinates(char *data,
                     unsigned short x,
                     unsigned short y,
                     unsigned char direction)
{
    short temp;
    temp = x;
    temp <<= 6;
    data[0] = 0;
    data[1] = 1;
    data[2] = 2;
    data[0] = HIBYTE(temp);
    data[1] = (unsigned char)(temp);
    temp = y;
    temp <<= 4;
    data[1] |= HIBYTE(temp);
    data[2] = LOBYTE(temp);
    data[2] |= direction;
}