92 lines
2.9 KiB
C++
92 lines
2.9 KiB
C++
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//
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// Copyright (c) 2017 James E. King III
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// https://www.boost.org/LICENSE_1_0.txt)
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//
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// Platform-specific random entropy provider
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//
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#ifndef BOOST_UUID_DETAIL_RANDOM_PROVIDER_HPP
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#define BOOST_UUID_DETAIL_RANDOM_PROVIDER_HPP
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#include <boost/config.hpp>
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#include <boost/cstdint.hpp>
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#include <boost/limits.hpp>
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#include <boost/static_assert.hpp>
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#include <boost/move/core.hpp>
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#include <boost/move/utility_core.hpp>
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#include <boost/type_traits/is_integral.hpp>
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#include <boost/type_traits/is_unsigned.hpp>
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#include <boost/uuid/entropy_error.hpp>
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#include <climits>
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#include <iterator>
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// Detection of the platform is separated from inclusion of the correct
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// header to facilitate mock testing of the provider implementations.
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#include <boost/uuid/detail/random_provider_detect_platform.hpp>
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#include <boost/uuid/detail/random_provider_include_platform.hpp>
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namespace boost {
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namespace uuids {
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namespace detail {
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//! \brief Contains code common to all random_provider implementations.
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//! \note random_provider_base is required to provide this method:
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//! void get_random_bytes(void *buf, size_t siz);
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//! \note noncopyable because of some base implementations so
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//! this makes it uniform across platforms to avoid any
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//! porting surprises
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class random_provider :
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public detail::random_provider_base
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{
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BOOST_MOVABLE_BUT_NOT_COPYABLE(random_provider)
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public:
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BOOST_DEFAULTED_FUNCTION(random_provider(), {})
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random_provider(BOOST_RV_REF(random_provider) that) BOOST_NOEXCEPT :
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detail::random_provider_base(boost::move(static_cast< detail::random_provider_base& >(that)))
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{
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}
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random_provider& operator= (BOOST_RV_REF(random_provider) that) BOOST_NOEXCEPT
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{
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static_cast< detail::random_provider_base& >(*this) = boost::move(static_cast< detail::random_provider_base& >(that));
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return *this;
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}
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//! Leverage the provider as a SeedSeq for
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//! PseudoRandomNumberGeneration seeing.
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//! \note: See Boost.Random documentation for more details
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template<class Iter>
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void generate(Iter first, Iter last)
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{
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typedef typename std::iterator_traits<Iter>::value_type value_type;
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BOOST_STATIC_ASSERT(is_integral<value_type>::value);
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BOOST_STATIC_ASSERT(is_unsigned<value_type>::value);
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BOOST_STATIC_ASSERT(sizeof(value_type) * CHAR_BIT >= 32);
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for (; first != last; ++first)
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{
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get_random_bytes(&*first, sizeof(*first));
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*first &= (std::numeric_limits<boost::uint32_t>::max)();
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}
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}
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//! Return the name of the selected provider
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const char * name() const
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{
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return BOOST_UUID_RANDOM_PROVIDER_STRINGIFY(BOOST_UUID_RANDOM_PROVIDER_NAME);
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}
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};
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} // detail
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} // uuids
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} // boost
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#endif // BOOST_UUID_DETAIL_RANDOM_PROVIDER_HPP
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