memory_file.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 MEMORY_FILE_HPP
#define MEMORY_FILE_HPP

#include "generic_file.hpp"
#include "storage.hpp"

namespace libdar
{


    class memory_file : public generic_file
    {
    public:

            // Constructors & Destructor
            //
            //

        memory_file(gf_mode m) : generic_file(m), data(0) { position = 0; };

            // virtual method inherited from generic_file
            //
            //

        bool skip(const infinint & pos);
        bool skip_to_eof();
        bool skip_relative(S_I x);
        infinint get_position() { if(is_terminated()) throw SRC_BUG; return position; };
        void reset() { if(is_terminated()) throw SRC_BUG; position = 0; data = storage(0); };

            // raw access to stored data
            //
            //

        infinint get_data_size() const { if(is_terminated()) throw SRC_BUG; return data.size(); };

        const storage & get_raw_data() const { if(is_terminated()) throw SRC_BUG; return data; };
        void set_raw_data(const storage & val) { if(is_terminated()) throw SRC_BUG; data = val; position = 0; };

#ifdef LIBDAR_SPECIAL_ALLOC
        USE_SPECIAL_ALLOC(memory_file);
#endif

    protected:
        U_I inherited_read(char *a, U_I size);
        void inherited_write(const char *a, U_I size);
        void inherited_sync_write() {};
        void inherited_terminate() {};

    private:
        storage data;
        infinint position;
    };


} // end of namespace

#endif