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archive_version.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 // $Id$
00022 //
00023 /*********************************************************************/
00024 
00028 
00029 #ifndef ARCHIVE_VERSION_HPP
00030 #define ARCHIVE_VERSION_HPP
00031 
00032 #include "../my_config.h"
00033 
00034 #include <string>
00035 
00036 #include "integers.hpp"
00037 #include "infinint.hpp"
00038 #include "generic_file.hpp"
00039 
00040 namespace libdar
00041 {
00042 
00045 
00047     class archive_version
00048     {
00049     public:
00051 
00057         archive_version(U_16 x = 0, unsigned char fix = 0);
00058 
00059         bool operator < (const archive_version & ref) const { return value() < ref.value(); };
00060         bool operator >= (const archive_version & ref) const { return value() >= ref.value(); };
00061         bool operator == (const archive_version & ref) const { return value() == ref.value(); };
00062         bool operator != (const archive_version & ref) const { return value() != ref.value(); };
00063         bool operator > (const archive_version & ref) const { return value() > ref.value(); };
00064         bool operator <= (const archive_version & ref) const { return value() <= ref.value(); };
00065 
00066         void dump(generic_file & f) const;
00067         void read(generic_file & f);
00068         std::string display() const;
00069 
00070         bool is_droot() const { return droot; };
00071             // the string read from file (read()) is "dro", which is the start of a catalogue
00072             // this may be the case with new versions where a header_version is placed where ought to be the catalogue
00073             // in this situation, we can know that this an old archive and must re-read the archive in the old way
00074 
00075     private:
00076         U_16 version;
00077         unsigned char fix;
00078         bool droot;
00079 
00080         U_I value() const { return (U_I)(version)*256 + fix; };
00081         static unsigned char to_digit(unsigned char val);
00082         static unsigned char to_char(unsigned char val);
00083     };
00084 
00085     extern const archive_version empty_archive_version();
00086 
00088 
00089 } // end of namespace
00090 
00091 #endif
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