1 /* 2 * Copyright (C) 2024 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <cstddef> 18 #include <cstdint> 19 20 #include "chre/util/hash.h" 21 22 namespace chre { 23 fnv1a32Hash(const uint8_t * data,size_t size)24uint32_t fnv1a32Hash(const uint8_t* data, size_t size) { 25 if (data == nullptr || size == 0) { 26 return UINT32_MAX; 27 } 28 29 constexpr uint32_t kFnvPrime = 0x01000193; 30 constexpr uint32_t kFnvOffset = 0x811c9dc5; 31 32 uint32_t hash = kFnvOffset; 33 for (size_t i = 0; i < size; ++i) { 34 hash ^= data[i]; 35 hash *= kFnvPrime; 36 } 37 return hash; 38 } 39 40 } // namespace chre 41