# 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