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null_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 // $Id: null_file.hpp,v 1.21 2011/04/17 13:12:29 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  protected :
63  U_I inherited_read(char *a, U_I size)
64  {
65 #ifdef MUTEX_WORKS
67 #endif
68  return 0;
69  };
70 
71  void inherited_write(const char *a, U_I size)
72  {
73 #ifdef MUTEX_WORKS
75 #endif
76  };
77 
79 
81  };
82 
84 
85 } // end of namespace
86 
87 #endif