/*
 * Copyright (c) 2021-2022 Huawei Device Co., Ltd.
 * 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.
 */

#include "common.h"

namespace OHOS {
uint32_t U32_AT(const uint8_t *ptr)
{
    const int threeDigitMove = 24;
    const int twoDigitMove = 16;
    const int oneDigitMove = 8;
    if (ptr == nullptr) {
        return 0;
    }
    /*
     * Move the 0th digit 24 to the left, the first digit 16 to the left, the second digit 8 to the left,
     * and the third digit no left
     */
    return (ptr[0] << threeDigitMove) | (ptr[1] << twoDigitMove) | (ptr[2] << oneDigitMove) | ptr[3];
}
}