92 lines
2.6 KiB
C++
Executable File
92 lines
2.6 KiB
C++
Executable File
/***************************************************************************
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* Copyright (C) 2006 by FThauer FHammer *
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* f.thauer@web.de *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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#define NOMINMAX // for Windows
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#include "tools.h"
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#include <openssl/rand.h>
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#include <limits>
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using namespace std;
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void Tools::getRandNumber(int start, int end, int howMany, int* randArray, bool different) {
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int r = end-start+1;
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unsigned char rand_buf[4];
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unsigned int randNumber;
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int i,j;
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if (!different) {
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for (i=0; i<howMany; i++) {
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if(!RAND_bytes(rand_buf, 4))
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{
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RAND_pseudo_bytes(rand_buf, 4);
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}
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randNumber = 0;
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for(j=0; j<4; j++) {
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randNumber += (rand_buf[j] << 8*j);
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}
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if(randNumber < ( (unsigned int) ( ((double)numeric_limits<unsigned int>::max()) / r ) ) * r) {
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randArray[i] = start + (randNumber % r);
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}
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}
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}
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else {
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int *tempArray = new int[end-start+1];
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for (i=0; i<(end-start+1); i++) tempArray[i]=1;
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int counter(0);
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while (counter < howMany) {
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if(!RAND_bytes(rand_buf, 4))
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{
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RAND_pseudo_bytes(rand_buf, 4);
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}
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randNumber = 0;
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for(j=0; j<4; j++) {
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randNumber += (rand_buf[j] << 8*j);
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}
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if(randNumber < ( (unsigned int) ( ((double)numeric_limits<unsigned int>::max()) / r ) ) * r) {
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randNumber = randNumber % r;
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if (tempArray[randNumber] == 1) {
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randArray[counter] = start + randNumber;
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tempArray[randNumber] = 0;
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counter++;
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}
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}
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}
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delete[] tempArray;
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}
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}
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