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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
25
26 #ifndef SCRAMBLER_HPP
27 #define SCRAMBLER_HPP
28
29 #include "../my_config.h"
30 #include <string>
31 #include "infinint.hpp"
32 #include "generic_file.hpp"
33 #include "erreurs.hpp"
34 #include "infinint.hpp"
35 #include "secu_string.hpp"
36
37 namespace libdar
38 {
39
42
43 class scrambler : public generic_file
44 {
45 public:
46 scrambler(const secu_string & pass, generic_file & hidden_side);
47 scrambler(const scrambler & ref) : generic_file(ref) { throw SRC_BUG; };
48 ~scrambler() { if(buffer != nullptr) meta_delete(buffer); };
49
50 const scrambler & operator = (const scrambler & ref) { throw SRC_BUG; };
51
52 bool skippable(skippability direction, const infinint & amount) { return ref->skippable(direction, amount); };
53 bool skip(const infinint & pos) { if(ref == nullptr) throw SRC_BUG; return ref->skip(pos); };
54 bool skip_to_eof() { if(ref==nullptr) throw SRC_BUG; return ref->skip_to_eof(); };
55 bool skip_relative(S_I x) { if(ref == nullptr) throw SRC_BUG; return ref->skip_relative(x); };
56 infinint get_position() const { if(ref == nullptr) throw SRC_BUG; return ref->get_position(); };
57
58 protected:
59 void inherited_read_ahead(const infinint & amount) { ref->read_ahead(amount); };
60 U_I inherited_read(char *a, U_I size);
61 void inherited_write(const char *a, U_I size);
62 void inherited_sync_write() {}; // nothing to do
63 void inherited_flush_read() {}; // nothing to do
64 void inherited_terminate() {}; // nothing to do
65
66 private:
67 secu_string key;
68 U_I len;
69 generic_file *ref;
70 unsigned char *buffer;
71 U_I buf_size;
72 };
73
74 } // end of namespace
75
76 #endif
libdar::scrambler::inherited_terminate
void inherited_terminate()
destructor-like call, except that it is allowed to throw exceptions
Definition: scrambler.hpp:64
libdar::scrambler::inherited_read_ahead
void inherited_read_ahead(const infinint &amount)
Definition: scrambler.hpp:59
libdar::scrambler::inherited_read
U_I inherited_read(char *a, U_I size)
implementation of read() operation
generic_file.hpp
class generic_file is defined here as well as class fichierthe generic_file interface is widely used ...
libdar::generic_file::read_ahead
virtual void read_ahead(const infinint &amount)
libdar::scrambler::skip
bool skip(const infinint &pos)
Definition: scrambler.hpp:53
libdar::scrambler::skip_relative
bool skip_relative(S_I x)
skip relatively to the current position
Definition: scrambler.hpp:55
libdar::scrambler::inherited_write
void inherited_write(const char *a, U_I size)
implementation of the write() operation
libdar::scrambler::get_position
infinint get_position() const
get the current read/write position
Definition: scrambler.hpp:56
libdar::generic_file::generic_file
generic_file(gf_mode m)
main constructor
Definition: generic_file.hpp:104
libdar::scrambler::skip_to_eof
bool skip_to_eof()
skip to the end of file
Definition: scrambler.hpp:54
erreurs.hpp
contains all the excetion class thrown by libdar
infinint.hpp
switch module to limitint (32 ou 64 bits integers) or infinint
libdar::scrambler::inherited_sync_write
void inherited_sync_write()
write down any pending data
Definition: scrambler.hpp:62
libdar::scrambler
scrambler is a very weak encryption scheme
Definition: scrambler.hpp:43
libdar::secu_string
class secu_string
Definition: secu_string.hpp:57
libdar::generic_file
this is the interface class from which all other data transfer classes inherit
Definition: generic_file.hpp:100
libdar::scrambler::skippable
bool skippable(skippability direction, const infinint &amount)
Definition: scrambler.hpp:52
libdar::scrambler::inherited_flush_read
void inherited_flush_read()
Definition: scrambler.hpp:63
libdar::infinint
the arbitrary large positive integer class
Definition: real_infinint.hpp:59
secu_string.hpp
this file contains the definition of secu_string class, a std::string like class but allocated in sec...
libdar
libdar namespace encapsulate all libdar symbols
Definition: archive.hpp:47