path: root/src/net/messagein.h

/*
 *  The Mana World Server
 *  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
 *
 *  $Id$
 */

#ifndef _TMWSERV_MESSAGEIN_H_
#define _TMWSERV_MESSAGEIN_H_

#include <string>

#include <SDL_types.h>

/**
 * Used for parsing an incoming message.
 */
class MessageIn
{
    public:
        /**
         * Constructor.
         */
        MessageIn(const char *data, unsigned int length);

        /**
         * Destructor.
         */
        ~MessageIn();

        short getId() { return mId; } /**< Returns the message ID. */

        char readByte();              /**< Reads a byte. */
        short readShort();            /**< Reads a short. */
        long readLong();              /**< Reads a long. */

        /**
         * Reads a 3-byte block containing tile-based coordinates.
         */
        void readCoordinates(Uint16 &x, Uint16 &y);

        /**
         * Reads a string. If a length is not given (-1), it is assumed
         * that the length of the string is stored in a short at the
         * start of the string.
         */
        std::string readString(int length = -1);

        /**
         * Returns the message length.
         */
        unsigned int
        getLength() { return mLength; }

        /**
         * Returns the length of unread data.
         */
        unsigned int
        getUnreadLength() { return mLength - mPos; }

    private:
        const char* mData;             /**< The message data. */
        unsigned int mLength;          /**< The length of the data. */
        short mId;                     /**< The message ID. */

        /**
         * Actual position in the packet. From 0 to packet->length.
         * A value bigger than packet->length means EOP was reached when
         * reading it.
         */
        unsigned int mPos;
};

#endif