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Selector.h

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00001 /* 00002 * steghide 0.5.1 - a steganography program 00003 * Copyright (C) 1999-2003 Stefan Hetzl <shetzl@chello.at> 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 */ 00020 00021 #ifndef SH_SELECTOR_H 00022 #define SH_SELECTOR_H 00023 00024 #include <string> 00025 #include <vector> 00026 #include "wrapper_hash_map.h" 00027 00028 #include "common.h" 00029 00030 class PseudoRandomSource ; 00031 00036 class Selector { 00037 public: 00043 Selector (UWORD32 m, std::string pp) ; 00044 00049 Selector (UWORD32 m) ; 00050 00057 Selector (const std::vector<UWORD32>& retvals) ; 00058 00059 ~Selector (void) ; 00060 00065 UWORD32 operator[] (UWORD32 i) ; 00066 00067 UWORD32 getRange (void) const 00068 { return Maximum ; } ; 00069 00070 private: 00071 std::vector<UWORD32> X ; 00072 std::vector<UWORD32> Y ; 00073 sgi::hash_map<UWORD32,UWORD32> Xreversed ; 00075 UWORD32 Maximum ; 00077 UWORD32 NumInArray ; 00078 PseudoRandomSource* PRandom ; 00079 00083 void calculate (UWORD32 m) ; 00084 00092 bool idxX (UWORD32 v, UWORD32 m, UWORD32* p) const ; 00093 00097 void setX (UWORD32 i, UWORD32 v) ; 00098 } ; 00099 00100 #endif // ndef SH_SELECTOR_H

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