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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <windows.h>
#include <time.h>
#include <io.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <primpl.h>
static BOOL
CurrentClockTickTime(LPDWORD lpdwHigh, LPDWORD lpdwLow)
{
LARGE_INTEGER liCount;
if (!QueryPerformanceCounter(&liCount))
return FALSE;
*lpdwHigh = liCount.u.HighPart;
*lpdwLow = liCount.u.LowPart;
return TRUE;
}
extern PRSize _PR_MD_GetRandomNoise( void *buf, PRSize size )
{
DWORD dwHigh, dwLow, dwVal;
size_t n = 0;
size_t nBytes;
time_t sTime;
if (size <= 0)
return 0;
CurrentClockTickTime(&dwHigh, &dwLow);
// get the maximally changing bits first
nBytes = sizeof(dwLow) > size ? size : sizeof(dwLow);
memcpy((char *)buf, &dwLow, nBytes);
n += nBytes;
size -= nBytes;
if (size <= 0)
return n;
nBytes = sizeof(dwHigh) > size ? size : sizeof(dwHigh);
memcpy(((char *)buf) + n, &dwHigh, nBytes);
n += nBytes;
size -= nBytes;
if (size <= 0)
return n;
// get the number of milliseconds that have elapsed since Windows started
dwVal = GetTickCount();
nBytes = sizeof(dwVal) > size ? size : sizeof(dwVal);
memcpy(((char *)buf) + n, &dwVal, nBytes);
n += nBytes;
size -= nBytes;
if (size <= 0)
return n;
// get the time in seconds since midnight Jan 1, 1970
time(&sTime);
nBytes = sizeof(sTime) > size ? size : sizeof(sTime);
memcpy(((char *)buf) + n, &sTime, nBytes);
n += nBytes;
return n;
}
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