Disk ARchive  2.4.5
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.pc/delete2/null_file.hpp
00001 /*********************************************************************/
00002 // dar - disk archive - a backup/restoration program
00003 // Copyright (C) 2002-2052 Denis Corbin
00004 //
00005 // This program is free software; you can redistribute it and/or
00006 // modify it under the terms of the GNU General Public License
00007 // as published by the Free Software Foundation; either version 2
00008 // of the License, or (at your option) any later version.
00009 // 
00010 // This program is distributed in the hope that it will be useful,
00011 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00012 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013 // GNU General Public License for more details.
00014 // 
00015 // You should have received a copy of the GNU General Public License
00016 // along with this program; if not, write to the Free Software
00017 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
00018 //
00019 // to contact the author : dar.linux@free.fr
00020 /*********************************************************************/
00021 // $Id$
00022 //
00023 /*********************************************************************/
00024 
00025 #ifndef NULL_FILE_HPP
00026 #define NULL_FILE_HPP
00027 
00028 //#pragma interface
00029 
00030 #include "generic_file.hpp"
00031 
00032 class null_file : public generic_file
00033 {
00034 public :
00035     null_file(gf_mode m) : generic_file(m) {};
00036     bool skip(const infinint &pos) { return pos == 0; };
00037     bool skip_to_eof() { return true; };
00038     bool skip_relative(signed int x) { return false; };
00039     infinint get_position() { return 0; };
00040 
00041 protected :
00042     int inherited_read(char *a, size_t size) { return 0; };
00043     int inherited_write(char *a, size_t size) { return size; };
00044 };
00045 
00046 #endif
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