/*
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This file is a part of JRTPLIB
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Copyright (c) 1999-2011 Jori Liesenborgs
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Contact: jori.liesenborgs@gmail.com
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This library was developed at the Expertise Centre for Digital Media
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(http://www.edm.uhasselt.be), a research center of the Hasselt University
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(http://www.uhasselt.be). The library is based upon work done for
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my thesis at the School for Knowledge Technology (Belgium/The Netherlands).
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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IN THE SOFTWARE.
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*/
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#if defined(WIN32) && !defined(_WIN32_WCE)
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#define _CRT_RAND_S
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#endif // WIN32 || _WIN32_WCE
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#include "rtprandomrands.h"
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#include "rtperrors.h"
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#if (defined(WIN32) && !defined(_WIN32_WCE)) && (defined(_MSC_VER) && _MSC_VER >= 1400 )
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#include <math.h>
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#include <stdlib.h>
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// If compiling on VC 8 or later for full Windows, we'll attempt to use rand_s,
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// which generates better random numbers. However, its only supported on Windows XP,
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// Windows Server 2003, and later, so we'll do a run-time check to see if we can
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// use it (it won't work on Windows 2000 SP4 for example).
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#define RTP_SUPPORT_RANDS
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#endif
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#include "rtpdebug.h"
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namespace jrtplib
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{
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#ifndef RTP_SUPPORT_RANDS
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RTPRandomRandS::RTPRandomRandS()
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{
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initialized = false;
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}
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RTPRandomRandS::~RTPRandomRandS()
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{
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}
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int RTPRandomRandS::Init()
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{
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return ERR_RTP_RTPRANDOMRANDS_NOTSUPPORTED;
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}
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uint8_t RTPRandomRandS::GetRandom8()
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{
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return 0;
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}
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uint16_t RTPRandomRandS::GetRandom16()
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{
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return 0;
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}
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uint32_t RTPRandomRandS::GetRandom32()
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{
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return 0;
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}
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double RTPRandomRandS::GetRandomDouble()
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{
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return 0;
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}
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#else
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RTPRandomRandS::RTPRandomRandS()
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{
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initialized = false;
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}
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RTPRandomRandS::~RTPRandomRandS()
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{
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}
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int RTPRandomRandS::Init()
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{
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if (initialized) // doesn't matter then
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return 0;
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HMODULE hAdvApi32 = LoadLibrary(TEXT("ADVAPI32.DLL"));
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if(hAdvApi32 != NULL)
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{
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if(NULL != GetProcAddress( hAdvApi32, "SystemFunction036" )) // RtlGenRandom
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{
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initialized = true;
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}
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FreeLibrary(hAdvApi32);
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hAdvApi32 = NULL;
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}
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if (!initialized)
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return ERR_RTP_RTPRANDOMRANDS_NOTSUPPORTED;
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return 0;
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}
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// rand_s gives a number between 0 and UINT_MAX. We'll assume that UINT_MAX is at least 8 bits
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uint8_t RTPRandomRandS::GetRandom8()
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{
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if (!initialized)
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return 0;
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unsigned int r;
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rand_s(&r);
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return (uint8_t)(r&0xff);
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}
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uint16_t RTPRandomRandS::GetRandom16()
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{
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if (!initialized)
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return 0;
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unsigned int r;
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int shift = 0;
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uint16_t x = 0;
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for (int i = 0 ; i < 2 ; i++, shift += 8)
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{
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rand_s(&r);
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x ^= ((uint16_t)r << shift);
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}
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return x;
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}
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uint32_t RTPRandomRandS::GetRandom32()
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{
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if (!initialized)
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return 0;
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unsigned int r;
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int shift = 0;
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uint32_t x = 0;
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for (int i = 0 ; i < 4 ; i++, shift += 8)
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{
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rand_s(&r);
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x ^= ((uint32_t)r << shift);
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}
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return x;
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}
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double RTPRandomRandS::GetRandomDouble()
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{
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if (!initialized)
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return 0;
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unsigned int r;
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int shift = 0;
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uint64_t x = 0;
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for (int i = 0 ; i < 8 ; i++, shift += 8)
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{
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rand_s(&r);
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x ^= ((uint64_t)r << shift);
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}
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x &= 0x7fffffffffffffffULL;
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int64_t x2 = (int64_t)x;
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return RTPRANDOM_2POWMIN63*(double)x2;
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}
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#endif // RTP_SUPPORT_RANDS
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} // end namespace
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