string_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 STRING_FILE_HPP
#define STRING_FILE_HPP

#include "../my_config.h"
#include "infinint.hpp"
#include "generic_file.hpp"
#include "integers.hpp"
#include "erreurs.hpp"

namespace libdar
{


    class string_file : public generic_file
    {
    public:

        string_file(const std::string & contents): generic_file(gf_read_only) { data = contents; cur = 0; len = data.size(); };

            // inherited from generic_file
        bool skip(const infinint & pos);
        bool skip_to_eof() { cur = len; return true; };
        bool skip_relative(S_I x);
        infinint get_position() { return cur; };

#ifdef LIBDAR_SPECIAL_ALLOC
        USE_SPECIAL_ALLOC(string_file);
#endif
    protected:
            // inherited from generic_file
        U_I inherited_read(char *a, U_I size);
        void inherited_write(const char *a, U_I size) { throw Efeature("Writing on a string_file is not allowed"); };
        void inherited_sync_write() {};
        void inherited_terminate() {};

    private:
        std::string data;
        infinint cur;
        infinint len;
    };

} // end of namespace

#endif