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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 ELASTIC_HPP 00027 #define ELASTIC_HPP 00028 00029 #include "../my_config.h" 00030 00031 #include "integers.hpp" 00032 #include "erreurs.hpp" 00033 #include "infinint.hpp" 00034 #include "generic_file.hpp" 00035 #include "header_version.hpp" 00036 00037 00038 namespace libdar 00039 { 00040 00043 00044 00045 enum elastic_direction { elastic_forward, elastic_backward }; 00046 00048 00053 class elastic : public on_pool 00054 { 00055 public: 00056 elastic(U_32 size); 00057 elastic(const unsigned char *buffer, U_32 size, elastic_direction dir, const archive_version & reading_ver); 00058 elastic(generic_file &f, elastic_direction dir, const archive_version & reading_ver); 00059 00060 U_32 dump(unsigned char *buffer, U_32 size) const; 00061 U_32 get_size() const { return taille; }; 00062 00063 static U_I max_length() { return (U_I)(254)*254*254*254 - 1; }; 00064 00065 private: 00066 U_32 taille; // max size of elastic buffer is 4GB which is large enough 00067 00068 void randomize(unsigned char *a) const; 00069 U_I base_from_version(const archive_version & reading_ver) const; 00070 unsigned char get_low_mark(const archive_version & reading_ver) const; 00071 unsigned char get_high_mark(const archive_version & reading_ver) const; 00072 unsigned char get_low_mark() const { return 255; }; 00073 unsigned char get_high_mark() const { return 254; }; 00074 00075 }; 00076 00078 00079 } // end of namespace 00080 00081 #endif