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
113 lines
2.8 KiB
C++
113 lines
2.8 KiB
C++
/*
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* Copyright (C) 2015-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 "seastarx.hh"
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#include <seastar/core/sstring.hh>
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#include "hashing.hh"
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#include <optional>
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#include <iosfwd>
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#include <functional>
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#include <compare>
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#include "utils/mutable_view.hh"
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#include <xxhash.h>
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using bytes = basic_sstring<int8_t, uint32_t, 31, false>;
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using bytes_view = std::basic_string_view<int8_t>;
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using bytes_mutable_view = basic_mutable_view<bytes_view::value_type>;
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using bytes_opt = std::optional<bytes>;
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using sstring_view = std::string_view;
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inline bytes to_bytes(bytes&& b) {
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return std::move(b);
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}
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inline sstring_view to_sstring_view(bytes_view view) {
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return {reinterpret_cast<const char*>(view.data()), view.size()};
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}
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inline bytes_view to_bytes_view(sstring_view view) {
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return {reinterpret_cast<const int8_t*>(view.data()), view.size()};
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}
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struct fmt_hex {
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bytes_view& v;
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fmt_hex(bytes_view& v) noexcept : v(v) {}
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};
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std::ostream& operator<<(std::ostream& os, const fmt_hex& hex);
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bytes from_hex(sstring_view s);
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sstring to_hex(bytes_view b);
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sstring to_hex(const bytes& b);
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sstring to_hex(const bytes_opt& b);
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std::ostream& operator<<(std::ostream& os, const bytes& b);
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std::ostream& operator<<(std::ostream& os, const bytes_opt& b);
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namespace std {
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// Must be in std:: namespace, or ADL fails
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std::ostream& operator<<(std::ostream& os, const bytes_view& b);
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}
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template<>
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struct appending_hash<bytes> {
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template<typename Hasher>
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void operator()(Hasher& h, const bytes& v) const {
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feed_hash(h, v.size());
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h.update(reinterpret_cast<const char*>(v.cbegin()), v.size() * sizeof(bytes::value_type));
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}
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};
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template<>
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struct appending_hash<bytes_view> {
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template<typename Hasher>
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void operator()(Hasher& h, bytes_view v) const {
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feed_hash(h, v.size());
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h.update(reinterpret_cast<const char*>(v.begin()), v.size() * sizeof(bytes_view::value_type));
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}
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};
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struct bytes_view_hasher : public hasher {
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XXH64_state_t _state;
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bytes_view_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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size_t finalize() {
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return static_cast<size_t>(XXH64_digest(&_state));
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}
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};
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namespace std {
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template <>
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struct hash<bytes_view> {
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size_t operator()(bytes_view v) const {
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bytes_view_hasher h;
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appending_hash<bytes_view>{}(h, v);
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return h.finalize();
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}
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};
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} // namespace std
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inline std::strong_ordering compare_unsigned(bytes_view v1, bytes_view v2) {
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auto size = std::min(v1.size(), v2.size());
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if (size) {
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auto n = memcmp(v1.begin(), v2.begin(), size);
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if (n) {
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return n <=> 0;
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}
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}
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return v1.size() <=> v2.size();
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}
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