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elastic.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,
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13 // GNU General Public License for more details.
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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: elastic.hpp,v 1.9.2.1 2012/02/19 17:25:08 edrusb Rel $
22 //
23 /*********************************************************************/
24 
28 
29 #ifndef ELASTIC_HPP
30 #define ELASTIC_HPP
31 
32 #include "../my_config.h"
33 
34 #include "integers.hpp"
35 #include "erreurs.hpp"
36 #include "infinint.hpp"
37 #include "generic_file.hpp"
38 #include "header_version.hpp"
39 
40 
41 namespace libdar
42 {
43 
46 
47 
48  enum elastic_direction { elastic_forward, elastic_backward };
49 
51 
56  class elastic
57  {
58  public:
59  elastic(U_32 size);
60  elastic(const unsigned char *buffer, U_32 size, elastic_direction dir, const archive_version & reading_ver);
61  elastic(generic_file &f, elastic_direction dir, const archive_version & reading_ver);
62 
63  U_32 dump(unsigned char *buffer, U_32 size) const;
64  U_32 get_size() const { return taille; };
65 
66  static U_I max_length() { return (U_I)(254)*254*254*254 - 1; };
67 
68 #ifdef LIBDAR_SPECIAL_ALLOC
69  USE_SPECIAL_ALLOC(elastic);
70 #endif
71 
72  private:
73  U_32 taille; // max size of elastic buffer is 4GB which is large enough
74 
75  void randomize(unsigned char *a) const;
76  U_I base_from_version(const archive_version & reading_ver) const;
77  unsigned char get_low_mark(const archive_version & reading_ver) const;
78  unsigned char get_high_mark(const archive_version & reading_ver) const;
79  unsigned char get_low_mark() const { return 255; };
80  unsigned char get_high_mark() const { return 254; };
81 
82  };
83 
85 
86 } // end of namespace
87 
88 #endif