Disk ARchive  2.5.2
Full featured and portable backup and archiving tool
generic_to_global_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 
00030 
00031 #ifndef GENERIC_TO_GLOBAL_FILE_HPP
00032 #define GENERIC_TO_GLOBAL_FILE_HPP
00033 
00034 #include "fichier_global.hpp"
00035 #include "memory_file.hpp"
00036 #include "storage.hpp"
00037 
00038 namespace libdar
00039 {
00040 
00043 
00044     class generic_to_global_file : public fichier_global
00045     {
00046     public:
00047 
00053     generic_to_global_file(user_interaction & dialog, generic_file *d, gf_mode mode): fichier_global(dialog, mode) { if(d == nullptr) throw SRC_BUG; if(d->get_mode() != gf_read_write && d->get_mode() != mode) throw SRC_BUG; data = d; };
00054 
00055         // virtual method inherited from generic_file
00056     bool skippable(skippability direction, const infinint & amount) { return data->skippable(direction, amount); }
00057     bool skip(const infinint & pos) { return data->skip(pos); };
00058     bool skip_to_eof() { return data->skip_to_eof(); };
00059     bool skip_relative(S_I x) { return data->skip_relative(x); };
00060     infinint get_position() const { return data->get_position(); };
00061 
00062 
00063         // virtual method inherited from fichier_global
00064     void change_ownership(const std::string & user, const std::string & group) {};
00065     void change_permission(U_I perm) {};
00066     infinint get_size() const { return data->get_position(); }; //< yes, this is the drawback of this template class convertion, get_size() does not return the real size of the object
00067     void fadvise(advise adv) const {};
00068 
00069 
00070     protected:
00071 
00072         // virtual method inherited from generic_file
00073     void inherited_read_ahead(const infinint & amount) {}; // no optimization can be done here, we rely on the OS here
00074     void inherited_sync_write() {};
00075     void inherited_flush_read() {};
00076     void inherited_terminate() {};
00077 
00078         // inherited from fichier_global
00079     U_I fichier_global_inherited_write(const char *a, U_I size) { data->write(a, size); return size; };
00080     bool fichier_global_inherited_read(char *a, U_I size, U_I & read, std::string & message) { read = data->read(a, size); message = "THIS IS A BUG IN GENERIC_TO_GLOBAL_FILE, PLEASE REPORT TO THE MAINTAINER!"; return true; };
00081 
00082     private:
00083     generic_file *data;
00084     };
00085 
00087 
00088 } // end of namespace
00089 
00090 #endif
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