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fichier_local.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
26
27 #ifndef FICHIER_LOCAL_HPP
28 #define FICHIER_LOCAL_HPP
29
30
31 #include "../my_config.h"
32
33 extern "C"
34 {
35 #if HAVE_UNISTD_H
36 #include <unistd.h>
37 #endif
38 } // end extern "C"
39
40 #include "integers.hpp"
41 #include "user_interaction.hpp"
42 #include "fichier_global.hpp"
43
44 #include <string>
45
46 namespace libdar
47 {
48
51
52
54
55 class fichier_local : public fichier_global
56 {
57 public :
58
60 fichier_local(const std::shared_ptr<user_interaction> & dialog,
61 const std::string & chemin,
62 gf_mode m,
63 U_I permission,
64 bool fail_if_exists,
65 bool erase,
66 bool furtive_mode);
67
69
71 fichier_local(const std::string & chemin, bool furtive_mode = false);
72
74 fichier_local(const fichier_local & ref) : fichier_global(ref) { copy_from(ref); };
75
77 fichier_local(fichier_local && ref) noexcept: fichier_global(std::move(ref)) { move_from(std::move(ref)); };
78
80 fichier_local & operator = (const fichier_local & ref) { detruit(); fichier_local::operator = (ref); copy_from(ref); return *this; };
81
83 fichier_local & operator = (fichier_local && ref) noexcept { fichier_global::operator = (std::move(ref)); move_from(std::move(ref)); return *this; };
84
86 ~fichier_local() { detruit(); };
87
88
90 virtual void change_ownership(const std::string & user, const std::string & group) override;
91
93 virtual void change_permission(U_I perm) override;
94
96 virtual infinint get_size() const override;
97
99 virtual void fadvise(advise adv) const override;
100
101 // inherited from generic_file
102 virtual bool skippable(skippability direction, const infinint & amount) override { return true; };
103 virtual bool skip(const infinint & pos) override;
104 virtual bool skip_to_eof() override;
105 virtual bool skip_relative(S_I x) override;
106 virtual infinint get_position() const override;
107
109
111 S_I give_fd_and_terminate() { int ret = filedesc; filedesc = -1; terminate(); return ret; };
112
113 protected :
114 // inherited from generic_file grand-parent class
115 virtual void inherited_read_ahead(const infinint & amount) override {}; // nothing done, calling readahead(2) could be added in the future
116 virtual void inherited_sync_write() override { fsync(); };
117 virtual void inherited_flush_read() override {}; // nothing stored in transit in this object
118 virtual void inherited_terminate() override { if(adv == advise_dontneed) fadvise(adv); };
119
120 // inherited from fichier_global parent class
121 virtual U_I fichier_global_inherited_write(const char *a, U_I size) override;
122 virtual bool fichier_global_inherited_read(char *a, U_I size, U_I & read, std::string & message) override;
123
124 private :
125 S_I filedesc;
126 advise adv;
127
128 void open(const std::string & chemin,
129 gf_mode m,
130 U_I permission,
131 bool fail_if_exists,
132 bool erase,
133 bool furtive_mode);
134
135 void copy_from(const fichier_local & ref);
136 void move_from(fichier_local && ref) noexcept;
137 void detruit() { if(filedesc >= 0) close(filedesc); filedesc = -1; };
138 int advise_to_int(advise arg) const;
139
141
145 void fsync() const;
146
147 };
148
150
151 } // end of namespace
152
153 #endif
libdar::fichier_local::~fichier_local
~fichier_local()
destructor
Definition: fichier_local.hpp:86
libdar::fichier_global::fichier_global
fichier_global(const std::shared_ptr< user_interaction > &dialog, gf_mode mode)
constructor
Definition: fichier_global.hpp:76
libdar::fichier_local::get_size
virtual infinint get_size() const override
return the size of the file
libdar::fichier_local::fichier_local
fichier_local(const std::shared_ptr< user_interaction > &dialog, const std::string &chemin, gf_mode m, U_I permission, bool fail_if_exists, bool erase, bool furtive_mode)
full featured constructors
libdar::fichier_local::skippable
virtual bool skippable(skippability direction, const infinint &amount) override
whether the implementation is able to skip
Definition: fichier_local.hpp:102
libdar::fichier_local::change_permission
virtual void change_permission(U_I perm) override
change the permission of the file
libdar::fichier_global::operator=
fichier_global & operator=(const fichier_global &ref)=default
assignment operator
user_interaction.hpp
defines the interaction interface between libdar and users.
libdar::fichier_local::fadvise
virtual void fadvise(advise adv) const override
set posix_fadvise for the whole file
integers.hpp
are defined here basic integer types that tend to be portable
libdar::gf_mode
gf_mode
generic_file openning modes
Definition: gf_mode.hpp:44
libdar::infinint
the arbitrary large positive integer class
Definition: real_infinint.hpp:62
libdar::fichier_global::advise
advise
Definition: fichier_global.hpp:62
libdar::fichier_local::inherited_read_ahead
virtual void inherited_read_ahead(const infinint &amount) override
tells the object that several calls to read() will follow to probably obtain at least the given amoun...
Definition: fichier_local.hpp:115
libdar::fichier_local::fsync
void fsync() const
sync the data to disk
libdar::fichier_local::fichier_local
fichier_local(const std::string &chemin, bool furtive_mode=false)
constructor without user_interaction
fichier_global.hpp
class fichier_global definition. This class is a pure virtual class class fichier_global is an abstra...
libdar::fichier_local::change_ownership
virtual void change_ownership(const std::string &user, const std::string &group) override
set the ownership of the file
libdar::fichier_global::advise_dontneed
@ advise_dontneed
application will not read the data in near future
Definition: fichier_global.hpp:68
libdar::fichier_local
filesystem local files
Definition: fichier_local.hpp:56
libdar::fichier_local::skip
virtual bool skip(const infinint &pos) override
skip at the absolute position
libdar::fichier_local::fichier_global_inherited_read
virtual bool fichier_global_inherited_read(char *a, U_I size, U_I &read, std::string &message) override
replaces generic_file::inherited_read() method, to allow the return of partial reading
libdar::generic_file::terminate
void terminate()
destructor-like call, except that it is allowed to throw exceptions
libdar::fichier_local::inherited_sync_write
virtual void inherited_sync_write() override
write down any pending data
Definition: fichier_local.hpp:116
libdar::fichier_local::fichier_local
fichier_local(fichier_local &&ref) noexcept
move constructor
Definition: fichier_local.hpp:77
libdar::generic_file::read
virtual U_I read(char *a, U_I size) override
read data from the generic_file inherited from proto_generic_file
libdar::fichier_local::skip_to_eof
virtual bool skip_to_eof() override
skip to the end of file
libdar::fichier_local::inherited_flush_read
virtual void inherited_flush_read() override
reset internal engine, flush caches in order to read the data at current position
Definition: fichier_local.hpp:117
libdar::fichier_local::give_fd_and_terminate
S_I give_fd_and_terminate()
provide the low level filedescriptor to the call and terminate()
Definition: fichier_local.hpp:111
libdar::fichier_local::get_position
virtual infinint get_position() const override
get the current read/write position
libdar::fichier_local::skip_relative
virtual bool skip_relative(S_I x) override
skip relatively to the current position
libdar::fichier_global
abstraction of filesystem files for entrepot
Definition: fichier_global.hpp:59
libdar::fichier_local::fichier_global_inherited_write
virtual U_I fichier_global_inherited_write(const char *a, U_I size) override
replaces generic_file::inherited_write() method, to allow the return of partial writings
libdar::fichier_local::fichier_local
fichier_local(const fichier_local &ref)
copy constructor
Definition: fichier_local.hpp:74
libdar::fichier_local::inherited_terminate
virtual void inherited_terminate() override
destructor-like call, except that it is allowed to throw exceptions
Definition: fichier_local.hpp:118
libdar::fichier_local::operator=
fichier_local & operator=(const fichier_local &ref)
assignment operator
Definition: fichier_local.hpp:80
libdar
libdar namespace encapsulate all libdar symbols
Definition: archive.hpp:47