Chocobo1
8 years ago
8 changed files with 109 additions and 6 deletions
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/*
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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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*/ |
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#include "random.h" |
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#include <cassert> |
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#include <chrono> |
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#include <random> |
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// on some platform `std::random_device` may generate the same number sequence
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static bool hasTrueRandomDevice{ std::random_device{}() != std::random_device{}() }; |
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static thread_local std::mt19937 generator{ |
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hasTrueRandomDevice |
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? std::random_device{}() |
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: (std::random_device::result_type) std::chrono::system_clock::now().time_since_epoch().count() |
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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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// better replacement for `std::rand`, don't use this for real cryptography application
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// min <= returned_value <= max
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assert(min <= max); |
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// new distribution is cheap: http://stackoverflow.com/a/19036349
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std::uniform_int_distribution<uint32_t> uniform(min, max); |
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return uniform(generator); |
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} |
@ -0,0 +1,44 @@ |
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/*
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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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*/ |
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#ifndef UTILS_RANDOM_H |
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#define UTILS_RANDOM_H |
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#include <cstdint> |
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#include <cstdlib> |
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namespace Utils |
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{ |
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namespace Random |
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{ |
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uint32_t rand(uint32_t min = 0, uint32_t max = UINT32_MAX); |
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} |
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} |
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#endif // UTILS_FS_H
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