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54 lines
1.7 KiB
54 lines
1.7 KiB
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <functional>
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#include <linux/if_ether.h>
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#include <stdint.h>
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#include <string.h>
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struct MacAddress {
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uint8_t addr[ETH_ALEN];
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bool isBroadcast() const {
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return memcmp(addr, "\xFF\xFF\xFF\xFF\xFF\xFF", ETH_ALEN) == 0;
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}
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} __attribute__((__packed__));
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template<class T>
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inline void hash_combine(size_t& seed, const T& value) {
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std::hash<T> hasher;
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seed ^= hasher(value) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
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}
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namespace std {
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template<> struct hash<MacAddress> {
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size_t operator()(const MacAddress& addr) const {
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size_t seed = 0;
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// Treat the first 4 bytes as an uint32_t to save some computation
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hash_combine(seed, *reinterpret_cast<const uint32_t*>(addr.addr));
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// And the remaining 2 bytes as an uint16_t
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hash_combine(seed, *reinterpret_cast<const uint16_t*>(addr.addr + 4));
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return seed;
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}
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};
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}
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