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A lightweight C++ OpenGL middleware for 2D/3D graphics

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# D:/VL/BuildSystem/VL_DISTRO/Visualization_Library_SDK/src/vlCore/Random.cpp

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    00001 /**************************************************************************************/
    00002 /*                                                                                    */
    00003 /*  Visualization Library                                                             */
    00004 /*  http://www.visualizationlibrary.org                                               */
    00005 /*                                                                                    */
    00006 /*  Copyright (c) 2005-2010, Michele Bosi                                             */
    00007 /*  All rights reserved.                                                              */
    00008 /*                                                                                    */
    00009 /*  Redistribution and use in source and binary forms, with or without modification,  */
    00010 /*  are permitted provided that the following conditions are met:                     */
    00011 /*                                                                                    */
    00012 /*  - Redistributions of source code must retain the above copyright notice, this     */
    00013 /*  list of conditions and the following disclaimer.                                  */
    00014 /*                                                                                    */
    00015 /*  - Redistributions in binary form must reproduce the above copyright notice, this  */
    00016 /*  list of conditions and the following disclaimer in the documentation and/or       */
    00017 /*  other materials provided with the distribution.                                   */
    00018 /*                                                                                    */
    00019 /*  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND   */
    00020 /*  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED     */
    00021 /*  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE            */
    00022 /*  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR  */
    00023 /*  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES    */
    00024 /*  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;      */
    00025 /*  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON    */
    00026 /*  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT           */
    00027 /*  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS     */
    00028 /*  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.                      */
    00029 /*                                                                                    */
    00030 /**************************************************************************************/
    00031
    00032 #include <vlCore/Random.hpp>
    00033 #include <vlCore/Time.hpp>
    00034 #include <vlCore/Log.hpp>
    00035 #include <vlCore/MersenneTwister.hpp>
    00036 #include <cstdlib>
    00037
    00038 #if defined(VL_PLATFORM_WINDOWS)
    00039   #include <wincrypt.h>
    00040 #endif
    00041
    00042 using namespace vl;
    00043
    00044 //-----------------------------------------------------------------------------
    00045 Random::Random()
    00046 {
    00047   VL_DEBUG_SET_OBJECT_NAME()
    00048 #if defined(_MSC_VER) || defined(__MINGW32__)
    00049   hCryptProv = NULL;
    00050   if( !CryptAcquireContext( (HCRYPTPROV*)&hCryptProv, NULL, NULL, PROV_RSA_FULL, 0) )
    00051     hCryptProv = NULL;
    00052 #elif defined(__GNUG__) && !defined(__MINGW32__)
    00053   mDefURandom = fopen("/dev/urandom", "rb");
    00054 #endif
    00055 }
    00056 //-----------------------------------------------------------------------------
    00057 Random::~Random()
    00058 {
    00059 #if defined(_MSC_VER) || defined(__MINGW32__)
    00060   if( hCryptProv  )
    00061   {
    00062     CryptReleaseContext( (HCRYPTPROV)hCryptProv, 0 );
    00063     hCryptProv = NULL;
    00064   }
    00065 #elif defined(__GNUG__) && !defined(__MINGW32__)
    00066   if (mDefURandom)
    00067   {
    00068     fclose(mDefURandom);
    00069     mDefURandom = NULL;
    00070   }
    00071 #endif
    00072 }
    00073 //-----------------------------------------------------------------------------
    00074 bool Random::fillRandom(void* ptr, size_t bytes) const
    00075 {
    00076 #if defined(_MSC_VER) || defined(__MINGW32__)
    00077   if( !(hCryptProv && CryptGenRandom( (HCRYPTPROV)hCryptProv, bytes, (BYTE*)ptr)) )
    00078   {
    00079     fillRandomMersenneTwister(ptr, bytes);
    00080     return false;
    00081   }
    00082   else
    00083     return true;
    00084 #elif defined(__GNUG__) && !defined(__MINGW32__)
    00085   if ( mDefURandom && fread(ptr, 1, bytes, mDefURandom) == bytes )
    00086     return true;
    00087   else
    00088   {
    00089     fillRandomMersenneTwister(ptr, bytes);
    00090     return false;
    00091   }
    00092 #else
    00093   fillRandomMersenneTwister(ptr, bytes);
    00094   return false;
    00095 #endif
    00096 }
    00097 //-----------------------------------------------------------------------------
    00098 void Random::fillRandomMersenneTwister(void* ptr, size_t bytes) const
    00099 {
    00100   unsigned int rnd = 0;
    00101
    00102   unsigned char* cptr = (unsigned char*)ptr;
    00103   memset(cptr, 0, bytes);
    00104   for (size_t i=0; i<bytes; ++i)
    00105   {
    00106     defMersenneTwister()->randInt( rnd );
    00107     cptr[i] ^= (rnd>>0)  & 0xFF;
    00108     cptr[i] ^= (rnd>>8)  & 0xFF;
    00109     cptr[i] ^= (rnd>>16) & 0xFF;
    00110     cptr[i] ^= (rnd>>12) & 0xFF;
    00111   }
    00112 }
    00113 //-----------------------------------------------------------------------------

Visualization Library v2011.09.1162 Reference Documentation
Copyright 2005-2011 Michele Bosi. All rights reserved.
Updated on Thu Jan 26 2012 00:43:30.
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