mirror of
https://github.com/d47081/qBittorrent.git
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141 lines
3.8 KiB
C++
141 lines
3.8 KiB
C++
/*
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* Bittorrent Client using Qt and libtorrent.
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* Copyright (C) 2017 Mike Tzou
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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
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* as published by the Free Software Foundation; either version 2
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* of 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
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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 permission to
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* link this program with the OpenSSL project's "OpenSSL" library (or with
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* modified versions of it that use the same license as the "OpenSSL" library),
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* and distribute the linked executables. You must obey the GNU General Public
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* License in all respects for all of the code used other than "OpenSSL". If you
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* modify file(s), you may extend this exception to your version of the file(s),
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* but you are not obligated to do so. If you do not wish to do so, delete this
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* exception statement from your version.
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*/
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#include "random.h"
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#include <limits>
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#include <random>
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#include <QtGlobal>
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#ifdef Q_OS_WIN
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#ifndef NOMINMAX
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#define NOMINMAX
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#endif
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#include <Windows.h>
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#include <Ntsecapi.h>
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#else // Q_OS_WIN
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#include <cstdio>
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#endif
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#include "misc.h"
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namespace
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{
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#ifdef Q_OS_WIN
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class RandomLayer
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{
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// need to satisfy UniformRandomBitGenerator requirements
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public:
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using result_type = uint32_t;
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RandomLayer()
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: m_rtlGenRandom {Utils::Misc::loadWinAPI<PRTLGENRANDOM>("Advapi32.dll", "SystemFunction036")}
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{
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if (!m_rtlGenRandom)
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qFatal("Failed to load RtlGenRandom()");
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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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result_type operator()()
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{
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result_type buf = 0;
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const bool result = m_rtlGenRandom(&buf, sizeof(buf));
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if (!result)
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qFatal("RtlGenRandom() failed");
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return buf;
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}
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private:
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using PRTLGENRANDOM = BOOLEAN (WINAPI *)(PVOID, ULONG);
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const PRTLGENRANDOM m_rtlGenRandom;
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};
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#else // Q_OS_WIN
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class RandomLayer
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{
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// need to satisfy UniformRandomBitGenerator requirements
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public:
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using result_type = uint32_t;
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RandomLayer()
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: m_randDev {fopen("/dev/urandom", "rb")}
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{
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if (!m_randDev)
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qFatal("Failed to open /dev/urandom");
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}
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~RandomLayer()
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{
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fclose(m_randDev);
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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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result_type operator()() const
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{
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result_type buf = 0;
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if (fread(&buf, sizeof(buf), 1, m_randDev) != 1)
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qFatal("Read /dev/urandom error");
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return buf;
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}
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private:
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FILE *m_randDev;
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};
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#endif
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}
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uint32_t Utils::Random::rand(const uint32_t min, const uint32_t max)
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{
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static RandomLayer layer;
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// new distribution is cheap: https://stackoverflow.com/a/19036349
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std::uniform_int_distribution<uint32_t> uniform(min, max);
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return uniform(layer);
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}
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