mirror of https://github.com/minetest/minetest.git
51 lines
1.3 KiB
C++
51 lines
1.3 KiB
C++
/*
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Minetest
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Copyright (C) 2021, DS
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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 Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser 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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#include "guid.h"
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#include <sstream>
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#include "serverenvironment.h"
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#include "util/base64.h"
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GUIdGenerator::GUIdGenerator() :
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m_uniform(0, UINT64_MAX)
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{
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m_rand_usable = m_rand.entropy() > 0.01;
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}
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GUId GUIdGenerator::next(const std::string &prefix)
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{
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std::stringstream s_guid;
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u64 a[2];
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if (m_rand_usable) {
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a[0] = m_uniform(m_rand);
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a[1] = m_uniform(m_rand);
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}
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else {
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a[0] = (static_cast<u64>(m_env->getGameTime()) << 32) + m_next;
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a[1] = m_uniform(m_rand);
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m_next++;
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}
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s_guid << prefix << base64_encode(std::string_view(reinterpret_cast<char *>(a), 16));
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return s_guid.str();
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}
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