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