81 lines
2.1 KiB
C++
81 lines
2.1 KiB
C++
//
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// VMime library (http://www.vmime.org)
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// Copyright (C) 2002-2013 Vincent Richard <vincent@vmime.org>
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 3 of
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// the License, or (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 GNU
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// 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 along
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// with this program; if not, write to the Free Software Foundation, Inc.,
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// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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//
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// Linking this library statically or dynamically with other modules is making
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// a combined work based on this library. Thus, the terms and conditions of
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// the GNU General Public License cover the whole combination.
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//
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#include "vmime/utility/random.hpp"
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#include "vmime/platform.hpp"
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#include <ctime>
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namespace vmime {
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namespace utility {
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unsigned int random::m_next(static_cast<unsigned int>(::std::time(NULL)));
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unsigned int random::getNext()
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{
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// Park and Miller's minimal standard generator:
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// xn+1 = (a * xn + b) mod c
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// xn+1 = (16807 * xn) mod (2^31 - 1)
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m_next = static_cast<unsigned int>((16807 * m_next) % 2147483647ul);
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return (m_next);
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}
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unsigned int random::getTime()
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{
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return static_cast <unsigned int>((platform::getHandler()->getUnixTime()));
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}
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unsigned int random::getProcess()
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{
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return (platform::getHandler()->getProcessId());
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}
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const string random::getString(const string::size_type length, const string& randomChars)
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{
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string res;
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res.resize(length);
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const unsigned int x = static_cast <unsigned int>(randomChars.length());
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string::size_type c = 0;
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while (c < length)
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{
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for (unsigned int n = random::getNext() ; n != 0 && c < length ; n /= x)
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{
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res[c++] = randomChars[n % x];
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}
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}
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return (res);
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}
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} // utility
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} // vmime
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