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secu_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 SECU_MEMORY_FILE_HPP
27 #define SECU_MEMORY_FILE_HPP
28
29 #include "generic_file.hpp"
30 #include "storage.hpp"
31
32 namespace libdar
33 {
34
37
38 class secu_memory_file : public generic_file
39 {
40 public:
41
43 secu_memory_file(U_I storage_size) : generic_file(gf_read_write), data(storage_size) { position = 0; };
44
45 // memory_storage specific methods
46
48 void reset(U_I size) { if(is_terminated()) throw SRC_BUG; position = 0; data.resize(size); };
49
51 infinint get_size() const { return data.get_size(); };
52
54 infinint get_allocated_size() const { return data.get_allocated_size(); };
55
57 void randomize(U_I size) { if(size > data.get_allocated_size()) reset(size); data.randomize(size); };
58
59
60 // virtual method inherited from generic_file
61 bool skippable(skippability direction, const infinint & amount) { return true; };
62 bool skip(const infinint & pos);
63 bool skip_to_eof();
64 bool skip_relative(S_I x);
65 infinint get_position() const { if(is_terminated()) throw SRC_BUG; return position; };
66
67 const secu_string & get_contents() const { return data; };
68
69 protected:
70
71 // virtual method inherited from generic_file
72 void inherited_read_ahead(const infinint & amount) {};
73 U_I inherited_read(char *a, U_I size);
74 void inherited_write(const char *a, U_I size);
75 void inherited_sync_write() {};
76 void inherited_flush_read() {};
77 void inherited_terminate() {};
78
79 private:
80 secu_string data;
81 U_I position;
82 };
83
85
86 } // end of namespace
87
88 #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