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elastic.hpp
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1/*********************************************************************/
2// dar - disk archive - a backup/restoration program
3// Copyright (C) 2002-2025 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
36namespace 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
my_config.h
include macro defined by the configure script and some specific additional ones
libdar
libdar namespace encapsulate all libdar symbols
Definition archive.hpp:47