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generic_to_global_file.hpp
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1 /*********************************************************************/
2 // dar - disk archive - a backup/restoration program
3 // Copyright (C) 2002-2052 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 //
19 // to contact the author : http://dar.linux.free.fr/email.html
20 /*********************************************************************/
21
30
31 #ifndef GENERIC_TO_GLOBAL_FILE_HPP
32 #define GENERIC_TO_GLOBAL_FILE_HPP
33
34 #include "fichier_global.hpp"
35 #include "memory_file.hpp"
36 #include "storage.hpp"
37
38 namespace libdar
39 {
40
43
44 class generic_to_global_file : public fichier_global
45 {
46 public:
47
53 generic_to_global_file(user_interaction & dialog, generic_file *d, gf_mode mode): fichier_global(dialog, mode) { if(d == nullptr) throw SRC_BUG; if(d->get_mode() != gf_read_write && d->get_mode() != mode) throw SRC_BUG; data = d; };
54
55 // virtual method inherited from generic_file
56 bool skippable(skippability direction, const infinint & amount) { return data->skippable(direction, amount); }
57 bool skip(const infinint & pos) { return data->skip(pos); };
58 bool skip_to_eof() { return data->skip_to_eof(); };
59 bool skip_relative(S_I x) { return data->skip_relative(x); };
60 infinint get_position() const { return data->get_position(); };
61
62
63 // virtual method inherited from fichier_global
64 void change_ownership(const std::string & user, const std::string & group) {};
65 void change_permission(U_I perm) {};
66 infinint get_size() const { return data->get_position(); }; //< yes, this is the drawback of this template class convertion, get_size() does not return the real size of the object
67 void fadvise(advise adv) const {};
68
69
70 protected:
71
72 // virtual method inherited from generic_file
73 void inherited_read_ahead(const infinint & amount) {}; // no optimization can be done here, we rely on the OS here
74 void inherited_sync_write() {};
75 void inherited_flush_read() {};
76 void inherited_terminate() {};
77
78 // inherited from fichier_global
79 U_I fichier_global_inherited_write(const char *a, U_I size) { data->write(a, size); return size; };
80 bool fichier_global_inherited_read(char *a, U_I size, U_I & read, std::string & message) { read = data->read(a, size); message = "THIS IS A BUG IN GENERIC_TO_GLOBAL_FILE, PLEASE REPORT TO THE MAINTAINER!"; return true; };
81
82 private:
83 generic_file *data;
84 };
85
87
88 } // end of namespace
89
90 #endif
storage.hpp
contains a class that permits arbitrary large data storage
libdar::gf_mode
gf_mode
generic_file openning modes
Definition: generic_file.hpp:77
memory_file.hpp
Memory_file is a generic_file class that only uses virtual memory.
fichier_global.hpp
class fichier_global definition. This class is a pure virtual class class fichier_global is an abstra...
libdar::generic_file::generic_file
generic_file(gf_mode m)
main constructor
Definition: generic_file.hpp:104
libdar::fichier_global::fichier_global
fichier_global(const user_interaction &dialog, gf_mode mode)
Definition: fichier_global.hpp:77
libdar::gf_read_write
read and write access
Definition: generic_file.hpp:81
libdar
libdar namespace encapsulate all libdar symbols
Definition: archive.hpp:47