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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
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