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cat_signature.hpp
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1 /*********************************************************************/
2 // dar - disk archive - a backup/restoration program
3 // Copyright (C) 2002-2020 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 : http://dar.linux.free.fr/email.html
20 /*********************************************************************/
21
25
26 #ifndef CAT_SIGNATURE_HPP
27 #define CAT_SIGNATURE_HPP
28
29 #include "../my_config.h"
30 #include "generic_file.hpp"
31 #include "archive_version.hpp"
32 #include "cat_status.hpp"
33
34 extern "C"
35 {
36 } // end extern "C"
37
38
39 namespace libdar
40 {
43
45
48 class cat_signature
49 {
50 public:
52 cat_signature(unsigned char original, saved_status status); // -> mk_signature()
53
55 cat_signature(generic_file & f, const archive_version & reading_ver);
56
58
64 bool read(generic_file & f, const archive_version & reading_ver);
65 void write(generic_file &f);
66
68
72 bool get_base_and_status(unsigned char & base, saved_status & saved) const;
73
74 static bool compatible_signature(unsigned char a, unsigned char b);
75
76 private:
77 static constexpr U_8 SAVED_FAKE_BIT = 0x80;
78 static constexpr U_8 SAVED_NON_DELTA_BIT = 0x40;
79
81
83 //. type of inode: and the nature of the object that has to be build from the following bytes
84 //. status of the info: on which depends whether some or all field should be read in the following data
95 //. lower case letters have binary values 011xxxxx
96 //. and higher case have binary values 010xxxxx
99 //. 011----- (3) status is "saved" (backward compatibility) this is a lowercase letter
100 //. 010----- (2) status is "not_saved" (backward compatibily) this is an uppercase letter
101 //. 111----- (7) status is "fake" (backward compatibility) used only with lowercase letters
102 //. 001----- (1) status is "delta" (setting back the byte 6 to 1 gives the letter value)
103 //. 100----- (4) status is "inode_only (setting back the bytes as 011 gives the letter value)
104 //. 101----- (5) status is unused (setting back the high bytes to 011 gives the letter value)
105 //. 110----- (6) status is unused (setting back the high bytes to 011 gives the letter value)
106 //. 000----- (0) status is unused (setting back the high bytes to 011 gives the letter value)
107 unsigned char field;
108 };
110
111 } // end of namespace
112
113 #endif
libdar::saved_status
saved_status
data saved status for an entry
Definition: cat_status.hpp:45
archive_version.hpp
class archive_version that rules which archive format to follow
libdar::cat_signature::read
bool read(generic_file &f, const archive_version &reading_ver)
read a signature from archive for an existing cat_signature object (overwrite its value)
cat_status.hpp
the different status of data and EA
libdar::archive_version
class archive_version manages the version of the archive format
Definition: archive_version.hpp:47
generic_file.hpp
class generic_file is defined here as well as class fichier
libdar::cat_signature
class cat_signature combines the cat_entree::signature() of the object with its saved_status and read...
Definition: cat_signature.hpp:49
libdar::cat_signature::field
unsigned char field
stores file type and status information
Definition: cat_signature.hpp:107
libdar::generic_file
this is the interface class from which all other data transfer classes inherit
Definition: generic_file.hpp:77
libdar::cat_signature::get_base_and_status
bool get_base_and_status(unsigned char &base, saved_status &saved) const
provide typ and status as read from the archive
libdar::cat_signature::cat_signature
cat_signature(unsigned char original, saved_status status)
set a signature from running libdar
libdar::cat_signature::cat_signature
cat_signature(generic_file &f, const archive_version &reading_ver)
set a signature from an disk archive
libdar
libdar namespace encapsulate all libdar symbols
Definition: archive.hpp:47