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header.hpp
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1/*********************************************************************/
2// dar - disk archive - a backup/restoration program
3// Copyright (C) 2002-2026 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
27#ifndef HEADER_HPP
28#define HEADER_HPP
29
30#include "../my_config.h"
31
32#include "infinint.hpp"
33#include "generic_file.hpp"
34#include "user_interaction.hpp"
35#include "tlv_list.hpp"
36#include "label.hpp"
37
38 namespace libdar
39{
40
43
44 const U_32 SAUV_MAGIC_NUMBER = 123; // Why "SAUV_..." because SAUV was the name of DAR much before its first release :-)
45
46 using magic_number = U_32;
47
48 enum flag_type
49 {
50 flag_type_terminal = 'T',
51 flag_type_non_terminal = 'N',
52 flag_type_located_at_end_of_slice = 'E' // since archive format version 8
53 };
54
55
57
64
65 class header
66 {
67 public:
68 // constructors & Co.
69
70 header();
71 header(const header & ref) { copy_from(ref); };
72 header(header && ref) noexcept { nullifyptr(); move_from(std::move(ref)); };
73 header & operator = (const header & ref) { free_pointers(); copy_from(ref); return *this; };
74 header & operator = (header && ref) noexcept { move_from(std::move(ref)); return *this; };
75 ~header() { free_pointers(); };
76
77 // global methods
78
79 void read(user_interaction & ui, generic_file & f, bool lax = false );
80 void write(user_interaction &, generic_file & f) const;
81
83
91 static U_I min_size() { return sizeof(magic_number) + label::common_size() + 2*sizeof(char); };
92
93
94 // fields access methods
95
96 magic_number & get_set_magic() { return magic; };
97 label & get_set_internal_name() { return internal_name; };
98 char & get_set_flag() { return flag; };
99 label & get_set_data_name() { return data_name; };
100
101 bool get_first_slice_size(infinint & size) const;
102 void set_first_slice_size(const infinint & size);
103 void unset_first_slice_size() { if(first_size != nullptr) { delete first_size; first_size = nullptr; } };
104
105 bool get_slice_size(infinint & size) const;
106 void set_slice_size(const infinint & size);
107 void unset_slice_size() { if(slice_size != nullptr) { delete slice_size; slice_size = nullptr; } };
108
109 bool is_old_header() const { return old_header; };
110 void set_format_07_compatibility() { old_header = true; };
111
112 private:
113 magic_number magic;
114 label internal_name;
115 label data_name;
116 char flag;
117 infinint *first_size;
118 infinint *slice_size;
119 bool old_header;
120
121 void nullifyptr() noexcept { first_size = slice_size = nullptr; };
122 void copy_from(const header & ref);
123 void move_from(header && ref) noexcept;
124 void free_pointers();
125 void fill_from(user_interaction & ui, const tlv_list & list);
126 tlv_list build_tlv_list(user_interaction & ui) const;
127 };
128
130
131} // end of namespace
132
133#endif
134
libdar::generic_file
this is the interface class from which all other data transfer classes inherit
Definition generic_file.hpp:77
libdar::header
this class manages the header of each slice
Definition header.hpp:66
libdar::header::old_header
bool old_header
true if the header has been read from an old archive (before release 2.4.0, format 07 and below) and ...
Definition header.hpp:119
libdar::header::slice_size
infinint * slice_size
size of slices (except first slice if specified else and last if not fulfilled)
Definition header.hpp:118
libdar::header::internal_name
label internal_name
constant string for all slices of a given archive (computed based on date and pid)
Definition header.hpp:114
libdar::header::flag
char flag
whether slice is the last of the archive or not
Definition header.hpp:116
libdar::header::magic
magic_number magic
constant string for all Dar archives
Definition header.hpp:113
libdar::header::data_name
label data_name
constant string for a set of data (constant with dar_xform, used to link isolated catalogue to its or...
Definition header.hpp:115
libdar::header::first_size
infinint * first_size
size of the first slice
Definition header.hpp:117
libdar::header::min_size
static U_I min_size()
minimal size of a header in an archive
Definition header.hpp:91
libdar::infinint
the arbitrary large positive integer class
Definition real_infinint.hpp:62
libdar::label
manage label data structure used in archive slice headers
Definition label.hpp:43
libdar::user_interaction
This is a pure virtual class that is used by libdar when interaction with the user is required.
Definition user_interaction.hpp:58
generic_file.hpp
class generic_file is defined here as well as class fichier
infinint.hpp
switch module to limitint (32 ou 64 bits integers) or infinint
label.hpp
define the datastructure "label" used to identify slice membership to an archive
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
tlv_list.hpp
List of Generic Type Length Value data structures.
user_interaction.hpp
defines the interaction interface between libdar and users.