00001 /* 00002 * random.h 00003 * 00004 * ISAAC random number generator by Bob Jenkins. 00005 * 00006 * Portable Windows Library 00007 * 00008 * Copyright (c) 1993-2000 Equivalence Pty. Ltd. 00009 * 00010 * The contents of this file are subject to the Mozilla Public License 00011 * Version 1.0 (the "License"); you may not use this file except in 00012 * compliance with the License. You may obtain a copy of the License at 00013 * http://www.mozilla.org/MPL/ 00014 * 00015 * Software distributed under the License is distributed on an "AS IS" 00016 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See 00017 * the License for the specific language governing rights and limitations 00018 * under the License. 00019 * 00020 * The Original Code is Portable Windows Library. 00021 * 00022 * The Initial Developer of the Original Code is Equivalence Pty. Ltd. 00023 * 00024 * Contributor(s): ______________________________________. 00025 * 00026 * $Log: random.h,v $ 00027 * Revision 1.5 2004/11/11 07:34:50 csoutheren 00028 * Added #include <ptlib.h> 00029 * 00030 * Revision 1.4 2002/09/16 01:08:59 robertj 00031 * Added #define so can select if #pragma interface/implementation is used on 00032 * platform basis (eg MacOS) rather than compiler, thanks Robert Monaghan. 00033 * 00034 * Revision 1.3 2001/03/03 05:12:47 robertj 00035 * Fixed yet another transcription error of random number generator code. 00036 * 00037 * Revision 1.2 2001/02/27 03:33:44 robertj 00038 * Changed random number generator due to licensing issues. 00039 * 00040 * Revision 1.1 2000/02/17 12:05:02 robertj 00041 * Added better random number generator after finding major flaws in MSVCRT version. 00042 * 00043 */ 00044 00045 #ifndef _PRANDOM 00046 #define _PRANDOM 00047 00048 00049 #ifdef P_USE_PRAGMA 00050 #pragma interface 00051 #endif 00052 00053 #include <ptlib.h> 00054 00071 class PRandom 00072 { 00073 public: 00078 PRandom(); 00079 00084 PRandom( 00085 DWORD seed 00086 ); 00087 00090 void SetSeed( 00091 DWORD seed 00092 ); 00093 00098 unsigned Generate(); 00099 00102 inline operator unsigned() { return Generate(); } 00103 00104 00109 static unsigned Number(); 00110 00111 00112 protected: 00113 enum { 00114 RandBits = 8, // I recommend 8 for crypto, 4 for simulations 00115 RandSize = 1<<RandBits 00116 }; 00117 00118 DWORD randcnt; 00119 DWORD randrsl[RandSize]; 00120 DWORD randmem[RandSize]; 00121 DWORD randa; 00122 DWORD randb; 00123 DWORD randc; 00124 }; 00125 00126 00127 #endif // _PRANDOM 00128 00129 00130 // End Of File ///////////////////////////////////////////////////////////////