Disk ARchive  2.5.2
Full featured and portable backup and archiving tool
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 : http://dar.linux.free.fr/email.html
00020 /*********************************************************************/
00021 
00025 
00026 #ifndef SCRAMBLER_HPP
00027 #define SCRAMBLER_HPP
00028 
00029 #include "../my_config.h"
00030 #include <string>
00031 #include "infinint.hpp"
00032 #include "generic_file.hpp"
00033 #include "erreurs.hpp"
00034 #include "infinint.hpp"
00035 #include "secu_string.hpp"
00036 
00037 namespace libdar
00038 {
00039 
00042 
00043     class scrambler : public generic_file
00044     {
00045     public:
00046         scrambler(const secu_string & pass, generic_file & hidden_side);
00047     scrambler(const scrambler & ref) : generic_file(ref) { throw SRC_BUG; };
00048         ~scrambler() { if(buffer != nullptr) meta_delete(buffer); };
00049 
00050     const scrambler & operator = (const scrambler & ref) { throw SRC_BUG; };
00051 
00052     bool skippable(skippability direction, const infinint & amount) { return ref->skippable(direction, amount); };
00053         bool skip(const infinint & pos) { if(ref == nullptr) throw SRC_BUG; return ref->skip(pos); };
00054         bool skip_to_eof() { if(ref==nullptr) throw SRC_BUG; return ref->skip_to_eof(); };
00055         bool skip_relative(S_I x) { if(ref == nullptr) throw SRC_BUG; return ref->skip_relative(x); };
00056         infinint get_position() const { if(ref == nullptr) throw SRC_BUG; return ref->get_position(); };
00057 
00058     protected:
00059     void inherited_read_ahead(const infinint & amount) { ref->read_ahead(amount); };
00060         U_I inherited_read(char *a, U_I size);
00061         void inherited_write(const char *a, U_I size);
00062     void inherited_sync_write() {}; // nothing to do
00063     void inherited_flush_read() {}; // nothing to do
00064     void inherited_terminate() {};  // nothing to do
00065 
00066     private:
00067         secu_string key;
00068         U_I len;
00069         generic_file *ref;
00070         unsigned char *buffer;
00071         U_I buf_size;
00072     };
00073 
00074 } // end of namespace
00075 
00076 #endif
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