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.pc/delete2/scrambler.hpp
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 // $Id$
00022 //
00023 /*********************************************************************/
00024 
00025 #ifndef SCRAMBLER_HPP
00026 #define SCRAMBLER_HPP
00027 
00028 #include "generic_file.hpp"
00029 #include "erreurs.hpp"
00030 #include "infinint.hpp"
00031 
00032 class scrambler : public generic_file
00033 {
00034 public:
00035     scrambler(const string & pass, generic_file & hidden_side);
00036     ~scrambler() { if(buffer != NULL) delete buffer; };
00037     
00038     bool skip(const infinint & pos) { if(ref == NULL) throw SRC_BUG; return ref->skip(pos); };
00039     bool skip_to_eof() { if(ref==NULL) throw SRC_BUG; return ref->skip_to_eof(); };
00040     bool skip_relative(S_I x) { if(ref == NULL) throw SRC_BUG; return ref->skip_relative(x); };
00041     infinint get_position() { if(ref == NULL) throw SRC_BUG; return ref->get_position(); };
00042 
00043 protected:
00044     S_I inherited_read(char *a, size_t size);
00045     S_I inherited_write(char *a, size_t size);
00046 
00047 private:
00048     string key;
00049     U_32 len;
00050     generic_file *ref;
00051     unsigned char *buffer;
00052     size_t buf_size;
00053 };
00054 
00055 #endif
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