tlv.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 TLV_HPP
#define TLV_HPP

#include "memory_file.hpp"
#include "storage.hpp"

namespace libdar
{


    class tlv
    {
    public:

            // constructors & Co.

        tlv() { type = 0; value = NULL; };
        tlv(generic_file & f) { init(f); };
        tlv(const tlv & ref) { copy_from(ref); };
        ~tlv() { detruit(); };

        const tlv & operator = (const tlv & ref) { detruit(); copy_from(ref); return *this; };

            // methods (read / write tlv datastructure to file)

        void read(generic_file & f); //< same as the constructor but on an existing object
        void write(generic_file & f) const; //< dumps the tlv contents to file

            // methods to fill the tlv object

        U_16 get_type() const { return type; };      //< get the TLV type
        void set_type(U_16 val) { type = val; };     //< set the TLV type
        void set_contents(const memory_file & contents);  //< the generic_file object is provided to dump data to the tlv object
        void get_contents(memory_file & contents) const;  //< the generic_file object is provided to read data from the tlv object

#ifdef LIBDAR_SPECIAL_ALLOC
        USE_SPECIAL_ALLOC(tlv);
#endif
    private:
        U_16 type;
        storage *value;

        void init(generic_file & f);
        void copy_from(const tlv & ref);
        void detruit() { if(value != NULL) { delete value; value = NULL; } };
    };


} // end of namespace

#endif