Disk ARchive
2.4.2
|
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: elastic.hpp,v 1.9 2011/01/09 17:25:58 edrusb Rel $ 00022 // 00023 /*********************************************************************/ 00024 00028 00029 #ifndef ELASTIC_HPP 00030 #define ELASTIC_HPP 00031 00032 #include "../my_config.h" 00033 00034 #include "integers.hpp" 00035 #include "erreurs.hpp" 00036 #include "infinint.hpp" 00037 #include "generic_file.hpp" 00038 #include "header_version.hpp" 00039 00040 00041 namespace libdar 00042 { 00043 00046 00047 00048 enum elastic_direction { elastic_forward, elastic_backward }; 00049 00051 00056 class elastic 00057 { 00058 public: 00059 elastic(U_32 size); 00060 elastic(const unsigned char *buffer, U_32 size, elastic_direction dir, const archive_version & reading_ver); 00061 elastic(generic_file &f, elastic_direction dir, const archive_version & reading_ver); 00062 00063 U_32 dump(unsigned char *buffer, U_32 size) const; 00064 U_32 get_size() const { return taille; }; 00065 00066 static U_I max_length() { return (U_I)(254)*254*254*254 - 1; }; 00067 00068 private: 00069 U_32 taille; // max size of elastic buffer is 4GB which is large enough 00070 00071 void randomize(unsigned char *a) const; 00072 U_I base_from_version(const archive_version & reading_ver) const; 00073 unsigned char get_low_mark(const archive_version & reading_ver) const; 00074 unsigned char get_high_mark(const archive_version & reading_ver) const; 00075 unsigned char get_low_mark() const { return 255; }; 00076 unsigned char get_high_mark() const { return 254; }; 00077 00078 }; 00079 00081 00082 } // end of namespace 00083 00084 #endif