Disk ARchive  2.5.2
Full featured and portable backup and archiving tool
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 : http://dar.linux.free.fr/email.html
00020 /*********************************************************************/
00021 
00025 
00026 #ifndef ELASTIC_HPP
00027 #define ELASTIC_HPP
00028 
00029 #include "../my_config.h"
00030 
00031 #include "integers.hpp"
00032 #include "erreurs.hpp"
00033 #include "infinint.hpp"
00034 #include "generic_file.hpp"
00035 #include "header_version.hpp"
00036 
00037 
00038 namespace libdar
00039 {
00040 
00043 
00044 
00045     enum elastic_direction { elastic_forward, elastic_backward };
00046 
00048 
00053     class elastic : public on_pool
00054     {
00055     public:
00056     elastic(U_32 size);
00057     elastic(const unsigned char *buffer, U_32 size, elastic_direction dir, const archive_version & reading_ver);
00058     elastic(generic_file &f, elastic_direction dir, const archive_version & reading_ver);
00059 
00060     U_32 dump(unsigned char *buffer, U_32 size) const;
00061     U_32 get_size() const { return taille; };
00062 
00063     static U_I max_length() { return (U_I)(254)*254*254*254 - 1; };
00064 
00065     private:
00066     U_32 taille; // max size of elastic buffer is 4GB which is large enough
00067 
00068     void randomize(unsigned char *a) const;
00069     U_I base_from_version(const archive_version & reading_ver) const;
00070     unsigned char get_low_mark(const archive_version & reading_ver) const;
00071     unsigned char get_high_mark(const archive_version & reading_ver) const;
00072     unsigned char get_low_mark() const { return 255; };
00073     unsigned char get_high_mark() const { return 254; };
00074 
00075     };
00076 
00078 
00079 } // end of namespace
00080 
00081 #endif
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