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Disk ARchive
2.5.2
Full featured and portable backup and archiving tool
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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 MEMORY_FILE_HPP 00027 #define MEMORY_FILE_HPP 00028 00029 #include "generic_file.hpp" 00030 #include "storage.hpp" 00031 00032 namespace libdar 00033 { 00034 00037 00038 class memory_file : public generic_file 00039 { 00040 public: 00041 00043 memory_file() : generic_file(gf_read_write), data(0) { position = 0; }; 00044 00045 // memory_storage specific methods 00046 00047 void reset() { if(is_terminated()) throw SRC_BUG; position = 0; data = storage(0); }; 00048 infinint size() const { return data.size(); }; 00049 00050 00051 // virtual method inherited from generic_file 00052 bool skippable(skippability direction, const infinint & amount) { return true; }; 00053 bool skip(const infinint & pos); 00054 bool skip_to_eof(); 00055 bool skip_relative(S_I x); 00056 infinint get_position() const { if(is_terminated()) throw SRC_BUG; return position; }; 00057 00058 00059 protected: 00060 00061 // virtual method inherited from generic_file 00062 void inherited_read_ahead(const infinint & amount) {}; // no optimization can be done here, we rely on the OS here 00063 U_I inherited_read(char *a, U_I size); 00064 void inherited_write(const char *a, U_I size); 00065 void inherited_sync_write() {}; 00066 void inherited_flush_read() {}; 00067 void inherited_terminate() {}; 00068 00069 private: 00070 storage data; 00071 infinint position; 00072 }; 00073 00075 00076 } // end of namespace 00077 00078 #endif