1 /* 2 * Copyright (c) 2021-2022 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 #include "common.h" 17 18 namespace OHOS { U32_AT(const uint8_t * ptr)19uint32_t U32_AT(const uint8_t *ptr) 20 { 21 const int threeDigitMove = 24; 22 const int twoDigitMove = 16; 23 const int oneDigitMove = 8; 24 if (ptr == nullptr) { 25 return 0; 26 } 27 /* 28 * Move the 0th digit 24 to the left, the first digit 16 to the left, the second digit 8 to the left, 29 * and the third digit no left 30 */ 31 return (ptr[0] << threeDigitMove) | (ptr[1] << twoDigitMove) | (ptr[2] << oneDigitMove) | ptr[3]; 32 } 33 } 34