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archive_version.hpp
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1 /*********************************************************************/
2 // dar - disk archive - a backup/restoration program
3 // Copyright (C) 2002-2052 Denis Corbin
4 //
5 // This program is free software; you can redistribute it and/or
6 // modify it under the terms of the GNU General Public License
7 // as published by the Free Software Foundation; either version 2
8 // of the License, or (at your option) any later version.
9 //
10 // This program is distributed in the hope that it will be useful,
11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 // GNU General Public License for more details.
14 //
15 // You should have received a copy of the GNU General Public License
16 // along with this program; if not, write to the Free Software
17 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 //
19 // to contact the author : http://dar.linux.free.fr/email.html
20 /*********************************************************************/
21 // $Id: archive_version.hpp,v 1.3 2011/01/09 17:25:58 edrusb Rel $
22 //
23 /*********************************************************************/
24 
28 
29 #ifndef ARCHIVE_VERSION_HPP
30 #define ARCHIVE_VERSION_HPP
31 
32 #include "../my_config.h"
33 
34 #include <string>
35 
36 #include "integers.hpp"
37 #include "infinint.hpp"
38 #include "generic_file.hpp"
39 
40 namespace libdar
41 {
42 
45 
48  {
49  public:
51 
57  archive_version(U_16 x = 0, unsigned char fix = 0);
58 
59  bool operator < (const archive_version & ref) const { return value() < ref.value(); };
60  bool operator >= (const archive_version & ref) const { return value() >= ref.value(); };
61  bool operator == (const archive_version & ref) const { return value() == ref.value(); };
62  bool operator != (const archive_version & ref) const { return value() != ref.value(); };
63  bool operator > (const archive_version & ref) const { return value() > ref.value(); };
64  bool operator <= (const archive_version & ref) const { return value() <= ref.value(); };
65 
66  void dump(generic_file & f) const;
67  void read(generic_file & f);
68  std::string display() const;
69 
70  bool is_droot() const { return droot; };
71  // the string read from file (read()) is "dro", which is the start of a catalogue
72  // this may be the case with new versions where a header_version is placed where ought to be the catalogue
73  // in this situation, we can know that this an old archive and must re-read the archive in the old way
74 
75  private:
76  U_16 version;
77  unsigned char fix;
78  bool droot;
79 
80  U_I value() const { return (U_I)(version)*256 + fix; };
81  static unsigned char to_digit(unsigned char val);
82  static unsigned char to_char(unsigned char val);
83  };
84 
85  extern const archive_version empty_archive_version();
86 
88 
89 } // end of namespace
90 
91 #endif