# elastic.hpp

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    00001 /*********************************************************************/
    00002 // dar - disk archive - a backup/restoration program
    00003 // Copyright (C) 2002-2052 Denis Corbin
    00004 //
    00005 // This program is free software; you can redistribute it and/or
    00006 // modify it under the terms of the GNU General Public License
    00007 // as published by the Free Software Foundation; either version 2
    00008 // of the License, or (at your option) any later version.
    00009 //
    00010 // This program is distributed in the hope that it will be useful,
    00011 // but WITHOUT ANY WARRANTY; without even the implied warranty of
    00012 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00013 // GNU General Public License for more details.
    00014 //
    00015 // You should have received a copy of the GNU General Public License
    00016 // along with this program; if not, write to the Free Software
    00017 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
    00018 //
    00019 // to contact the author : dar.linux@free.fr
    00020 /*********************************************************************/
    00021 // $Id: elastic.hpp,v 1.5.4.1 2008/05/09 20:58:27 edrusb Rel $
    00022 //
    00023 /*********************************************************************/
    00024
    00028
    00029 #ifndef ELASTIC_HPP
    00030 #define ELASTIC_HPP
    00031
    00032 #include "../my_config.h"
    00033
    00034 #include "integers.hpp"
    00035 #include "erreurs.hpp"
    00036 #include "infinint.hpp"
    00037 #include "generic_file.hpp"
    00038 #include "header_version.hpp"
    00039
    00040
    00041 namespace libdar
    00042 {
    00043
    00044     enum elastic_direction { elastic_forward, elastic_backward };
    00045
    00047
    00052     class elastic
    00053     {
    00054     public:
    00055         elastic(U_32 size);
    00056         elastic(const unsigned char *buffer, U_32 size, elastic_direction dir, const dar_version & reading_ver);
    00057         elastic(generic_file &f, elastic_direction dir, const dar_version & reading_ver);
    00058
    00059         U_32 dump(unsigned char *buffer, U_32 size) const;
    00060         U_32 get_size() const { return taille; };
    00061
    00062         static U_I max_length() { return (U_I)(254)*254*254*254 - 1; };
    00063
    00064     private:
    00065         U_32 taille; // max size of elastic buffer is 4GB which is large enough
    00066
    00067         void randomize(unsigned char *a) const;
    00068         U_I base_from_version(const dar_version & reading_ver) const;
    00069         unsigned char get_low_mark(const dar_version & reading_ver) const;
    00070         unsigned char get_high_mark(const dar_version & reading_ver) const;
    00071         unsigned char get_low_mark() const { return 255; };
    00072         unsigned char get_high_mark() const { return 254; };
    00073
    00074     };
    00075
    00076 } // end of namespace
    00077
    00078 #endif