mirror of https://github.com/aria2/aria2
106 lines
2.8 KiB
C++
106 lines
2.8 KiB
C++
/* <!-- copyright */
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/*
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* aria2 - The high speed download utility
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*
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* Copyright (C) 2006 Tatsuhiro Tsujikawa
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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 Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of portions of this program with the
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* OpenSSL library under certain conditions as described in each
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* individual source file, and distribute linked combinations
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* including the two.
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* You must obey the GNU General Public License in all respects
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* for all of the code used other than OpenSSL. If you modify
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* file(s) with this exception, you may extend this exception to your
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* version of the file(s), but you are not obligated to do so. If you
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* do not wish to do so, delete this exception statement from your
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* version. If you delete this exception statement from all source
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* files in the program, then also delete it here.
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*/
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/* copyright --> */
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#ifndef D_SIMPLE_RANDOMIZER_H
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#define D_SIMPLE_RANDOMIZER_H
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#include "Randomizer.h"
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#include <memory>
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#include <random>
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#ifdef __MINGW32__
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# include <wincrypt.h>
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#endif
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namespace aria2 {
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class SimpleRandomizer : public Randomizer {
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private:
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static std::unique_ptr<SimpleRandomizer> randomizer_;
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SimpleRandomizer();
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private:
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#ifdef __MINGW32__
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HCRYPTPROV provider_;
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#else
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std::random_device dev_;
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#endif // ! __MINGW32__
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public:
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typedef std::random_device::result_type result_type;
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static const std::unique_ptr<SimpleRandomizer>& getInstance();
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virtual ~SimpleRandomizer();
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/**
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* Returns random number in [0, to).
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*/
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virtual long int getRandomNumber(long int to) CXX11_OVERRIDE;
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void getRandomBytes(unsigned char *buf, size_t len);
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long int operator()(long int to)
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{
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return getRandomNumber(to);
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}
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result_type operator()()
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{
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result_type rv;
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getRandomBytes(reinterpret_cast<unsigned char*>(&rv), sizeof(rv));
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return rv;
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}
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static constexpr result_type min()
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{
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return std::numeric_limits<result_type>::min();
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}
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static constexpr result_type max()
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{
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return std::numeric_limits<result_type>::max();
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}
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static double entropy()
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{
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return 0.0;
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}
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};
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} // namespace aria2
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#endif // D_SIMPLE_RANDOMIZER_H
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