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scrambler.hpp
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1 /*********************************************************************/
2 // dar - disk archive - a backup/restoration program
3 // Copyright (C) 2002-2052 Denis Corbin
4 //
5 // This program is free software; you can redistribute it and/or
6 // modify it under the terms of the GNU General Public License
7 // as published by the Free Software Foundation; either version 2
8 // of the License, or (at your option) any later version.
9 //
10 // This program is distributed in the hope that it will be useful,
11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 // GNU General Public License for more details.
14 //
15 // You should have received a copy of the GNU General Public License
16 // along with this program; if not, write to the Free Software
17 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 //
19 // to contact the author : http://dar.linux.free.fr/email.html
20 /*********************************************************************/
21 // $Id: scrambler.hpp,v 1.21.2.1 2012/02/19 17:25:09 edrusb Rel $
22 //
23 /*********************************************************************/
24 
28 
29 #ifndef SCRAMBLER_HPP
30 #define SCRAMBLER_HPP
31 
32 #include "../my_config.h"
33 #include <string>
34 #include "infinint.hpp"
35 #include "generic_file.hpp"
36 #include "erreurs.hpp"
37 #include "infinint.hpp"
38 #include "secu_string.hpp"
39 
40 namespace libdar
41 {
42 
45 
46  class scrambler : public generic_file
47  {
48  public:
49  scrambler(const secu_string & pass, generic_file & hidden_side);
50  scrambler(const scrambler & ref) : generic_file(ref) { throw SRC_BUG; };
51  ~scrambler() { if(buffer != NULL) delete [] buffer; };
52 
53  const scrambler & operator = (const scrambler & ref) { throw SRC_BUG; };
54 
55  bool skip(const infinint & pos) { if(ref == NULL) throw SRC_BUG; return ref->skip(pos); };
56  bool skip_to_eof() { if(ref==NULL) throw SRC_BUG; return ref->skip_to_eof(); };
57  bool skip_relative(S_I x) { if(ref == NULL) throw SRC_BUG; return ref->skip_relative(x); };
58  infinint get_position() { if(ref == NULL) throw SRC_BUG; return ref->get_position(); };
59 
60 #ifdef LIBDAR_SPECIAL_ALLOC
61  USE_SPECIAL_ALLOC(scrambler);
62 #endif
63  protected:
64  U_I inherited_read(char *a, U_I size);
65  void inherited_write(const char *a, U_I size);
66  void inherited_sync_write() {}; // nothing to do
67  void inherited_terminate() {}; // nothing to do
68 
69  private:
70  std::string key;
71  U_32 len;
72  generic_file *ref;
73  unsigned char *buffer;
74  U_I buf_size;
75  };
76 
77 } // end of namespace
78 
79 #endif