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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 
42  // Constructors & Destructor
43  //
44  //
45 
46  memory_file(gf_mode m) : generic_file(m), data(0) { position = 0; };
47 
48  // virtual method inherited from generic_file
49  //
50  //
51 
52  bool skip(const infinint & pos);
53  bool skip_to_eof();
54  bool skip_relative(S_I x);
55  infinint get_position() { if(is_terminated()) throw SRC_BUG; return position; };
56  void reset() { if(is_terminated()) throw SRC_BUG; position = 0; data = storage(0); };
57 
58  // raw access to stored data
59  //
60  //
61 
63  infinint get_data_size() const { if(is_terminated()) throw SRC_BUG; return data.size(); };
64 
66  const storage & get_raw_data() const { if(is_terminated()) throw SRC_BUG; return data; };
67  void set_raw_data(const storage & val) { if(is_terminated()) throw SRC_BUG; data = val; position = 0; };
68 
69 #ifdef LIBDAR_SPECIAL_ALLOC
70  USE_SPECIAL_ALLOC(memory_file);
71 #endif
72 
73  protected:
74  U_I inherited_read(char *a, U_I size);
75  void inherited_write(const char *a, U_I size);
76  void inherited_sync_write() {};
77  void inherited_terminate() {};
78 
79  private:
80  storage data;
81  infinint position;
82  };
83 
85 
86 } // end of namespace
87 
88 #endif