util.cpp

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/***************************************************************************
 *   Copyright (C) 2004-2006 by Ilya A. Volynets-Evenbakh                  *
 *   ilya@total-knowledge.com                                              *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
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 ***************************************************************************/
#include <util.h>
#include <stdlib.h>
#include <time.h>
#include <string>
#include <algorithm>
#include <iostream>
#include <sptk4/CBase64.h> // Base64 encoding/decoding

namespace container
{
namespace util
{

struct __SrandInit
{
    __SrandInit(){srandom(time(0));}
};
static __SrandInit __srtandInit;

unsigned long getRandomLong()
{
    //srandom(time(0));
    return random();
}


std::string getRandomString(int len)
{
    sptk::CBuffer in(len+2*sizeof(unsigned long));
    unsigned long* l=(unsigned long*)in.data();
    int cnt=len/sizeof(unsigned long)+1;
    for(int i=0;i<cnt;i++)
        l[i]=getRandomLong();
    in.bytes(len);
    sptk::CBuffer out;
    sptk::CBase64::encode(out,in);
    std::string ret(out.data(),len);
    std::transform(ret.begin(),ret.end(),ret.begin(),TrEq());
    return ret;
}


}
}