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elastic.hpp
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1/*********************************************************************/
2// dar - disk archive - a backup/restoration program
3// Copyright (C) 2002-2024 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18//
19// to contact the author, see the AUTHOR file
20/*********************************************************************/
21
25
26#ifndef ELASTIC_HPP
27#define ELASTIC_HPP
28
29#include "../my_config.h"
30
31#include "integers.hpp"
32#include "infinint.hpp"
33#include "generic_file.hpp"
34#include "archive_version.hpp"
35
36 namespace libdar
37{
38
41
42
44 enum elastic_direction { elastic_forward, elastic_backward };
45
47
51 class elastic
52 {
53 public:
54 elastic(U_32 size);
55 elastic(const unsigned char *buffer, U_32 size, elastic_direction dir, const archive_version & reading_ver);
56 elastic(generic_file &f, elastic_direction dir, const archive_version & reading_ver);
57 elastic(const elastic & ref) = default;
58 elastic(elastic && ref) noexcept = default;
59 elastic & operator = (const elastic & ref) = default;
60 elastic & operator = (elastic && ref) noexcept = default;
61 ~elastic() = default;
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 private:
69 U_32 taille; // max size of elastic buffer is 4GB which is large enough
70
71 void randomize(unsigned char *a) const;
72 U_I base_from_version(const archive_version & reading_ver) const;
73 unsigned char get_low_mark(const archive_version & reading_ver) const;
74 unsigned char get_high_mark(const archive_version & reading_ver) const;
75 unsigned char get_low_mark() const { return 255; };
76 unsigned char get_high_mark() const { return 254; };
77
78 };
79
81
82} // end of namespace
83
84#endif
archive_version.hpp
class archive_version that rules which archive format to follow
libdar::archive_version
class archive_version manages the version of the archive format
Definition archive_version.hpp:47
libdar::elastic
the elastic buffer class
Definition elastic.hpp:52
libdar::generic_file
this is the interface class from which all other data transfer classes inherit
Definition generic_file.hpp:77
generic_file.hpp
class generic_file is defined here as well as class fichier
libdar::elastic_direction
elastic_direction
reading direction of an elastic buffer
Definition elastic.hpp:44
infinint.hpp
switch module to limitint (32 ou 64 bits integers) or infinint
integers.hpp
are defined here basic integer types that tend to be portable
libdar
libdar namespace encapsulate all libdar symbols
Definition archive.hpp:47