Disk ARchive  2.5.2
Full featured and portable backup and archiving tool
secu_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 
00025 
00026 #ifndef SECU_MEMORY_FILE_HPP
00027 #define SECU_MEMORY_FILE_HPP
00028 
00029 #include "generic_file.hpp"
00030 #include "storage.hpp"
00031 
00032 namespace libdar
00033 {
00034 
00037 
00038     class secu_memory_file : public generic_file
00039     {
00040     public:
00041 
00043     secu_memory_file(U_I storage_size) : generic_file(gf_read_write), data(storage_size) { position = 0; };
00044 
00045         // memory_storage specific methods
00046 
00048     void reset(U_I size) { if(is_terminated()) throw SRC_BUG; position = 0; data.resize(size); };
00049 
00051     infinint get_size() const { return data.get_size(); };
00052 
00054     infinint get_allocated_size() const { return data.get_allocated_size(); };
00055 
00057     void randomize(U_I size) { if(size > data.get_allocated_size()) reset(size); data.randomize(size); };
00058 
00059 
00060         // virtual method inherited from generic_file
00061     bool skippable(skippability direction, const infinint & amount) { return true; };
00062     bool skip(const infinint & pos);
00063     bool skip_to_eof();
00064     bool skip_relative(S_I x);
00065     infinint get_position() const { if(is_terminated()) throw SRC_BUG; return position; };
00066 
00067     const secu_string & get_contents() const { return data; };
00068 
00069     protected:
00070 
00071         // virtual method inherited from generic_file
00072     void inherited_read_ahead(const infinint & amount) {};
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_flush_read() {};
00077     void inherited_terminate() {};
00078 
00079     private:
00080     secu_string data;
00081     U_I position;
00082     };
00083 
00085 
00086 } // end of namespace
00087 
00088 #endif
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