2fbd78c769
The DIGEST_FOR_NULL_VALUES feature was added in 21a77612b3 (2020; 4.4)
and can now be assumed to be always present. The hasher which it invoked
is removed.
57 lines
1.2 KiB
C++
57 lines
1.2 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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