label.hpp

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/*********************************************************************/
// dar - disk archive - a backup/restoration program
// Copyright (C) 2002-2052 Denis Corbin
//
// 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
//
// to contact the author : http://dar.linux.free.fr/email.html
/*********************************************************************/


#ifndef LABEL_HPP
#define LABEL_HPP

#include "../my_config.h"

#include "integers.hpp"
#include "generic_file.hpp"

namespace libdar
{


    class label
    {
    public:
        label(); // builds a label equal to 'zero'
        label(const label & ref) { copy_from(ref); };
        const label & operator = (const label & ref) { copy_from(ref); return *this; };

        bool operator == (const label & ref) const;
        bool operator != (const label & ref) const { return ! ((*this) == ref); };

        void clear();
        bool is_cleared() const;

        void generate_internal_filename();

        void read(generic_file & f);
        void dump(generic_file & f) const;

        void invert_first_byte() { val[0] = ~val[0]; };

            // avoid using these two calls, only here for backward compatibility
            // where the cost to move to object is really too heavy than
            // sticking with an char array.
        U_I size() const { return LABEL_SIZE; };
        char *data() { return (char *)&val; };
        const char *data() const { return (char *)&val; };

        static U_I common_size() { return LABEL_SIZE; };

#ifdef LIBDAR_SPECIAL_ALLOC
        USE_SPECIAL_ALLOC(label);
#endif
    private:
        static const U_I LABEL_SIZE = 10;

        char val[LABEL_SIZE];

        void copy_from(const label & ref);
    };


    extern const label label_zero;


} // end of namespace

#endif