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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 dar64-2.8.3-win64/include/dar/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 dar64-2.8.3-win64/include/dar/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 dar64-2.8.3-win64/include/dar/user_interaction.hpp:58
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 dar64-2.8.3-win64/include/dar/archive.hpp:47
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
tlv_list.hpp
List of Generic Type Length Value data structures.
user_interaction.hpp
defines the interaction interface between libdar and users.