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