Disk ARchive 2.4.2
memory_file.hpp
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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 : http://dar.linux.free.fr/email.html
00020 /*********************************************************************/
00021 // $Id: memory_file.hpp,v 1.12 2011/06/02 13:28:46 edrusb Rel $
00022 //
00023 /*********************************************************************/
00024 
00028 
00029 #ifndef MEMORY_FILE_HPP
00030 #define MEMORY_FILE_HPP
00031 
00032 #include "generic_file.hpp"
00033 #include "storage.hpp"
00034 
00035 namespace libdar
00036 {
00037 
00040 
00041     class memory_file : public generic_file
00042     {
00043     public:
00044 
00045             // Constructors & Destructor
00046             //
00047             //
00048 
00049         memory_file(gf_mode m) : generic_file(m), data(0) { position = 0; };
00050 
00051             // virtual method inherited from generic_file
00052             //
00053             //
00054 
00055         bool skip(const infinint & pos);
00056         bool skip_to_eof();
00057         bool skip_relative(S_I x);
00058         infinint get_position() { if(is_terminated()) throw SRC_BUG; return position; };
00059         void reset() { if(is_terminated()) throw SRC_BUG; position = 0; data = storage(0); };
00060 
00061             // raw access to stored data
00062             //
00063             //
00064 
00066         infinint get_data_size() const { if(is_terminated()) throw SRC_BUG; return data.size(); };
00067 
00069         const storage & get_raw_data() const { if(is_terminated()) throw SRC_BUG; return data; };
00070         void set_raw_data(const storage & val) { if(is_terminated()) throw SRC_BUG; data = val; position = 0; };
00071 
00072     protected:
00073         U_I inherited_read(char *a, U_I size);
00074         void inherited_write(const char *a, U_I size);
00075         void inherited_sync_write() {};
00076         void inherited_terminate() {};
00077 
00078     private:
00079         storage data;
00080         infinint position;
00081     };
00082 
00084 
00085 } // end of namespace
00086 
00087 #endif
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