82 lines
2.3 KiB
C++
82 lines
2.3 KiB
C++
/*
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* Copyright (C) 2018-present ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla 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 Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "digest_algorithm.hh"
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#include "hashers.hh"
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#include "xx_hasher.hh"
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#include <type_traits>
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#include <variant>
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namespace query {
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struct noop_hasher {
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void update(const char* ptr, size_t length) noexcept { }
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std::array<uint8_t, 16> finalize_array() { return std::array<uint8_t, 16>(); };
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};
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class digester final {
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std::variant<noop_hasher, md5_hasher, xx_hasher, legacy_xx_hasher_without_null_digest> _impl;
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public:
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explicit digester(digest_algorithm algo) {
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switch (algo) {
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case digest_algorithm::MD5:
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_impl = md5_hasher();
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break;
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case digest_algorithm::xxHash:
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_impl = xx_hasher();
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break;
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case digest_algorithm::legacy_xxHash_without_null_digest:
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_impl = legacy_xx_hasher_without_null_digest();
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break;
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case digest_algorithm ::none:
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_impl = noop_hasher();
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break;
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}
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}
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template<typename T, typename... Args>
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void feed_hash(const T& value, Args&&... args) {
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std::visit([&] (auto& hasher) noexcept -> void {
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::feed_hash(hasher, value, std::forward<Args>(args)...);
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}, _impl);
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};
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std::array<uint8_t, 16> finalize_array() {
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return std::visit([&] (auto& hasher) {
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return hasher.finalize_array();
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}, _impl);
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}
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};
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using default_hasher = xx_hasher;
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template<typename Hasher>
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using using_hash_of_hash = std::negation<std::disjunction<std::is_same<Hasher, md5_hasher>, std::is_same<Hasher, noop_hasher>>>;
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template<typename Hasher>
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inline constexpr bool using_hash_of_hash_v = using_hash_of_hash<Hasher>::value;
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}
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