Disk ARchive  2.4.5
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups
null_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 // $Id: null_file.hpp,v 1.21.2.1 2012/02/19 17:25:09 edrusb Rel $
22 //
23 /*********************************************************************/
24 
30 
31 #ifndef NULL_FILE_HPP
32 #define NULL_FILE_HPP
33 
34 #include "../my_config.h"
35 #include "generic_file.hpp"
36 #include "thread_cancellation.hpp"
37 
38 namespace libdar
39 {
40 
43 
45 
52 
54  {
55  public :
56  null_file(gf_mode m) : generic_file(m) {};
57  bool skip(const infinint &pos) { return true; };
58  bool skip_to_eof() { return true; };
59  bool skip_relative(signed int x) { return false; };
60  infinint get_position() { return 0; };
61 
62 #ifdef LIBDAR_SPECIAL_ALLOC
63  USE_SPECIAL_ALLOC(null_file);
64 #endif
65  protected :
66  U_I inherited_read(char *a, U_I size)
67  {
68 #ifdef MUTEX_WORKS
70 #endif
71  return 0;
72  };
73 
74  void inherited_write(const char *a, U_I size)
75  {
76 #ifdef MUTEX_WORKS
78 #endif
79  };
80 
82 
84  };
85 
87 
88 } // end of namespace
89 
90 #endif