fcb8d040e8
Instead of lengthy blurbs, switch to single-line, machine-readable standardized (https://spdx.dev) license identifiers. The Linux kernel switched long ago, so there is strong precedent. Three cases are handled: AGPL-only, Apache-only, and dual licensed. For the latter case, I chose (AGPL-3.0-or-later and Apache-2.0), reasoning that our changes are extensive enough to apply our license. The changes we applied mechanically with a script, except to licenses/README.md. Closes #9937
64 lines
1.4 KiB
C++
64 lines
1.4 KiB
C++
/*
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* Copyright (C) 2018-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#pragma once
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#include "bytes.hh"
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#include "utils/serialization.hh"
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Warray-bounds"
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#include <xxhash.h>
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#pragma GCC diagnostic pop
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#include <array>
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class xx_hasher {
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static constexpr size_t digest_size = 16;
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XXH64_state_t _state;
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public:
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explicit xx_hasher(uint64_t seed = 0) noexcept {
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XXH64_reset(&_state, seed);
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}
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void update(const char* ptr, size_t length) noexcept {
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XXH64_update(&_state, ptr, length);
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}
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bytes finalize() {
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bytes digest{bytes::initialized_later(), digest_size};
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serialize_to(digest.begin());
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return digest;
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}
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std::array<uint8_t, digest_size> finalize_array() {
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std::array<uint8_t, digest_size> digest;
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serialize_to(digest.begin());
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return digest;
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}
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uint64_t finalize_uint64() {
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return XXH64_digest(&_state);
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}
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private:
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template<typename OutIterator>
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void serialize_to(OutIterator&& out) {
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serialize_int64(out, 0);
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serialize_int64(out, finalize_uint64());
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}
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};
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// Used to specialize templates in order to fix a bug
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// in handling null values: #4567
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class legacy_xx_hasher_without_null_digest : public xx_hasher {
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public:
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explicit legacy_xx_hasher_without_null_digest(uint64_t seed = 0) noexcept : xx_hasher(seed) {}
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};
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