Disk ARchive  2.5.15
Full featured and portable backup and archiving tool
secu_memory_file.hpp
Go to the documentation of this file.
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
class generic_file is defined here as well as class fichierthe generic_file interface is widely used ...
contains a class that permits arbitrary large data storage
generic_file(gf_mode m)
main constructor
bool is_terminated() const
read and write access
libdar namespace encapsulate all libdar symbols
Definition: archive.hpp:47