Disk ARchive 2.3.10
scrambler.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 : dar.linux@free.fr
00020 /*********************************************************************/
00021 // $Id: scrambler.hpp,v 1.10.2.1 2007/07/22 16:35:00 edrusb Rel $
00022 //
00023 /*********************************************************************/
00024 
00027 
00028 #ifndef SCRAMBLER_HPP
00029 #define SCRAMBLER_HPP
00030 
00031 #include "../my_config.h"
00032 #include <string>
00033 #include "infinint.hpp"
00034 #include "generic_file.hpp"
00035 #include "erreurs.hpp"
00036 #include "infinint.hpp"
00037 
00038 namespace libdar
00039 {
00040 
00043 
00044     class scrambler : public generic_file
00045     {
00046     public:
00047         scrambler(user_interaction & dialog, const std::string & pass, generic_file & hidden_side);
00048         ~scrambler() { if(buffer != NULL) delete [] buffer; };
00049 
00050         bool skip(const infinint & pos) { if(ref == NULL) throw SRC_BUG; return ref->skip(pos); };
00051         bool skip_to_eof() { if(ref==NULL) throw SRC_BUG; return ref->skip_to_eof(); };
00052         bool skip_relative(S_I x) { if(ref == NULL) throw SRC_BUG; return ref->skip_relative(x); };
00053         infinint get_position() { if(ref == NULL) throw SRC_BUG; return ref->get_position(); };
00054 
00055     protected:
00056         S_I inherited_read(char *a, size_t size);
00057         S_I inherited_write(const char *a, size_t size);
00058 
00059     private:
00060         std::string key;
00061         U_32 len;
00062         generic_file *ref;
00063         unsigned char *buffer;
00064         size_t buf_size;
00065     };
00066 
00067 } // end of namespace
00068 
00069 #endif
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