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https://github.com/bolero-MURAKAMI/Sprout.git
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72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
#ifndef SPROUT_UUID_NAME_GENERATOR_HPP
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#define SPROUT_UUID_NAME_GENERATOR_HPP
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#include <sprout/config.hpp>
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#include <sprout/string.hpp>
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#include <sprout/uuid/uuid.hpp>
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#include <sprout/checksum/sha1.hpp>
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namespace sprout {
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namespace uuids {
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//
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// name_generator
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//
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class name_generator {
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public:
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typedef sprout::uuids::uuid result_type;
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private:
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typedef typename result_type::value_type value_type;
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private:
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sprout::sha1 sha_;
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private:
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SPROUT_CONSTEXPR result_type sha_to_uuid_1(sprout::sha1::value_type const& value) const {
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return result_type{{
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value[0],
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value[1],
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value[2],
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value[3],
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value[4],
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value[5],
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static_cast<value_type>((value[6] & 0x5F) | 0x50),
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value[7],
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static_cast<value_type>((value[8] & 0xBF) | 0x80),
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value[9],
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value[10],
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value[11],
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value[12],
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value[13],
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value[14],
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value[15]
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}};
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}
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SPROUT_CONSTEXPR result_type sha_to_uuid(sprout::sha1 const& sha) const {
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return sha_to_uuid_1(sha.checksum());
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}
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public:
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SPROUT_CONSTEXPR name_generator()
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: sha_(sprout::sha1().process_range(sprout::uuids::uuid{{0}}))
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{}
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SPROUT_CONSTEXPR explicit name_generator(sprout::uuids::uuid const& namespace_uuid)
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: sha_(sprout::sha1().process_range(namespace_uuid))
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{}
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template<typename Elem, std::size_t N, typename Traits>
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SPROUT_CONSTEXPR result_type operator()(sprout::basic_string<Elem, N, Traits> const& name) const {
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return sha_to_uuid(sha_.process_range(name));
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}
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SPROUT_CONSTEXPR result_type operator()(char const* name) const {
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return sha_to_uuid(sha_.process_bytes(name, sprout::char_traits<char>::length(name)));
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}
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SPROUT_CONSTEXPR result_type operator()(wchar_t const* name) const {
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return sha_to_uuid(sha_.process_bytes(name, sprout::char_traits<wchar_t>::length(name)));
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}
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SPROUT_CONSTEXPR result_type operator()(char16_t const* name) const {
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return sha_to_uuid(sha_.process_bytes(name, sprout::char_traits<char16_t>::length(name)));
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}
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SPROUT_CONSTEXPR result_type operator()(char32_t const* name) const {
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return sha_to_uuid(sha_.process_bytes(name, sprout::char_traits<char32_t>::length(name)));
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}
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};
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} // namespace uuids
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} // namespace sprout
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#endif // #ifndef SPROUT_UUID_NAME_GENERATOR_HPP
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