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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 
25 
26 #ifndef ARCHIVE_VERSION_HPP
27 #define ARCHIVE_VERSION_HPP
28 
29 #include "../my_config.h"
30 
31 #include <string>
32 
33 #include "integers.hpp"
34 #include "infinint.hpp"
35 #include "generic_file.hpp"
36 
37 namespace libdar
38 {
39 
42 
45  {
46  public:
48 
54  archive_version(U_16 x = 0, unsigned char fix = 0);
55 
56  bool operator < (const archive_version & ref) const { return value() < ref.value(); };
57  bool operator >= (const archive_version & ref) const { return value() >= ref.value(); };
58  bool operator == (const archive_version & ref) const { return value() == ref.value(); };
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 
63  void dump(generic_file & f) const;
64  void read(generic_file & f);
65  std::string display() const;
66 
67  bool is_droot() const { return droot; };
68  // the string read from file (read()) is "dro", which is the start of a catalogue
69  // this may be the case with new versions where a header_version is placed where ought to be the catalogue
70  // in this situation, we can know that this an old archive and must re-read the archive in the old way
71 
72  private:
73  U_16 version;
74  unsigned char fix;
75  bool droot;
76 
77  U_I value() const { return (U_I)(version)*256 + fix; };
78  static unsigned char to_digit(unsigned char val);
79  static unsigned char to_char(unsigned char val);
80  };
81 
82  extern const archive_version empty_archive_version();
83 
85 
86 } // end of namespace
87 
88 #endif