Mercurial > trustbridge > nss-cmake-static

annotate nspr/pr/src/md/windows/w32rng.c @ 3:150b72113545

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Add DBM and legacydb support
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:32:02 +0200
parents 1e5118fa0cb1
children
rev   line source
0
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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2 /* This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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5
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6 #include <windows.h>
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7 #include <time.h>
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8 #include <io.h>
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9 #include <sys/types.h>
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10 #include <sys/stat.h>
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11 #include <stdio.h>
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12 #include <primpl.h>
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13
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14 static BOOL
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15 CurrentClockTickTime(LPDWORD lpdwHigh, LPDWORD lpdwLow)
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16 {
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17 LARGE_INTEGER liCount;
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18
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19 if (!QueryPerformanceCounter(&liCount))
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20 return FALSE;
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21
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22 *lpdwHigh = liCount.u.HighPart;
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23 *lpdwLow = liCount.u.LowPart;
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24 return TRUE;
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25 }
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26
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27 extern PRSize _PR_MD_GetRandomNoise( void *buf, PRSize size )
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28 {
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29 DWORD dwHigh, dwLow, dwVal;
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30 size_t n = 0;
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31 size_t nBytes;
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32 time_t sTime;
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33
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34 if (size <= 0)
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35 return 0;
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36
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37 CurrentClockTickTime(&dwHigh, &dwLow);
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38
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39 // get the maximally changing bits first
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40 nBytes = sizeof(dwLow) > size ? size : sizeof(dwLow);
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41 memcpy((char *)buf, &dwLow, nBytes);
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42 n += nBytes;
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43 size -= nBytes;
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44
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45 if (size <= 0)
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46 return n;
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47
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48 nBytes = sizeof(dwHigh) > size ? size : sizeof(dwHigh);
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49 memcpy(((char *)buf) + n, &dwHigh, nBytes);
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50 n += nBytes;
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51 size -= nBytes;
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52
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53 if (size <= 0)
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54 return n;
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55
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56 // get the number of milliseconds that have elapsed since Windows started
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57 dwVal = GetTickCount();
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58
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59 nBytes = sizeof(dwVal) > size ? size : sizeof(dwVal);
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60 memcpy(((char *)buf) + n, &dwVal, nBytes);
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61 n += nBytes;
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62 size -= nBytes;
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63
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64 if (size <= 0)
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65 return n;
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66
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67 // get the time in seconds since midnight Jan 1, 1970
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68 time(&sTime);
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69 nBytes = sizeof(sTime) > size ? size : sizeof(sTime);
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70 memcpy(((char *)buf) + n, &sTime, nBytes);
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71 n += nBytes;
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72
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73 return n;
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74 }
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75
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