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memory_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
25
26 #ifndef MEMORY_FILE_HPP
27 #define MEMORY_FILE_HPP
28
29 #include "generic_file.hpp"
30 #include "storage.hpp"
31
32 namespace libdar
33 {
34
37
38 class memory_file : public generic_file
39 {
40 public:
41
43 memory_file() : generic_file(gf_read_write), data(0) { position = 0; };
44
45 // memory_storage specific methods
46
47 void reset() { if(is_terminated()) throw SRC_BUG; position = 0; data = storage(0); };
48 infinint size() const { return data.size(); };
49
50
51 // virtual method inherited from generic_file
52 bool skippable(skippability direction, const infinint & amount) { return true; };
53 bool skip(const infinint & pos);
54 bool skip_to_eof();
55 bool skip_relative(S_I x);
56 infinint get_position() const { if(is_terminated()) throw SRC_BUG; return position; };
57
58
59 protected:
60
61 // virtual method inherited from generic_file
62 void inherited_read_ahead(const infinint & amount) {}; // no optimization can be done here, we rely on the OS here
63 U_I inherited_read(char *a, U_I size);
64 void inherited_write(const char *a, U_I size);
65 void inherited_sync_write() {};
66 void inherited_flush_read() {};
67 void inherited_terminate() {};
68
69 private:
70 storage data;
71 infinint position;
72 };
73
75
76 } // end of namespace
77
78 #endif
generic_file.hpp
class generic_file is defined here as well as class fichierthe generic_file interface is widely used ...
storage.hpp
contains a class that permits arbitrary large data storage
libdar::generic_file::is_terminated
bool is_terminated() const
Definition: generic_file.hpp:316
libdar::generic_file::generic_file
generic_file(gf_mode m)
main constructor
Definition: generic_file.hpp:104
libdar::gf_read_write
read and write access
Definition: generic_file.hpp:81
libdar
libdar namespace encapsulate all libdar symbols
Definition: archive.hpp:47