steghide  0.5.1
Selector.h
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1 /*
2  * steghide 0.5.1 - a steganography program
3  * Copyright (C) 1999-2003 Stefan Hetzl <shetzl@chello.at>
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  */
20 
21 #ifndef SH_SELECTOR_H
22 #define SH_SELECTOR_H
23 
24 #include <string>
25 #include <vector>
26 #include "wrapper_hash_map.h"
27 
28 #include "common.h"
29 
30 class PseudoRandomSource ;
31 
36 class Selector {
37  public:
43  Selector (UWORD32 m, std::string pp) ;
44 
49  Selector (UWORD32 m) ;
50 
57  Selector (const std::vector<UWORD32>& retvals) ;
58 
59  ~Selector (void) ;
60 
66 
67  UWORD32 getRange (void) const
68  { return Maximum ; } ;
69 
70  private:
71  std::vector<UWORD32> X ;
72  std::vector<UWORD32> Y ;
73  sgi::hash_map<UWORD32,UWORD32> Xreversed ;
79 
83  void calculate (UWORD32 m) ;
84 
92  bool idxX (UWORD32 v, UWORD32 m, UWORD32* p) const ;
93 
97  void setX (UWORD32 i, UWORD32 v) ;
98 } ;
99 
100 #endif // ndef SH_SELECTOR_H
void setX(UWORD32 i, UWORD32 v)
Definition: Selector.cc:130
~Selector(void)
Definition: Selector.cc:61
UWORD32 NumInArray
the number of calculated positions in the arrays
Definition: Selector.h:77
bool idxX(UWORD32 v, UWORD32 m, UWORD32 *p) const
Definition: Selector.cc:119
UWORD32 Maximum
operator[] will return a value in {0,...,Maximum-1}
Definition: Selector.h:75
PseudoRandomSource * PRandom
Definition: Selector.h:78
sgi::hash_map< UWORD32, UWORD32 > Xreversed
Definition: Selector.h:73
void calculate(UWORD32 m)
Definition: Selector.cc:75
std::vector< UWORD32 > X
Definition: Selector.h:68
unsigned long UWORD32
Definition: common.h:45
a random permutation of a random combination
Definition: Selector.h:36
UWORD32 getRange(void) const
Definition: Selector.h:67
Selector(UWORD32 m, std::string pp)
Definition: Selector.cc:26
std::vector< UWORD32 > Y
Definition: Selector.h:72
this class serves as a source of reproducible (pseudo-)random numbers
Definition: PseudoRandomSource.h:33
UWORD32 operator[](UWORD32 i)
Definition: Selector.cc:68