/*
 * Copyright (c) 2023 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.
 */

#ifndef HCODEC_UTILS_H
#define HCODEC_UTILS_H

#include <vector>
#include <algorithm>

namespace OHOS::MediaAVCodec {
inline constexpr int TIME_RATIO_S_TO_MS = 1000;
inline constexpr double US_TO_MS = 1000.0;
inline constexpr double US_TO_S = 1000000.0;

inline uint32_t GetYuv420Size(uint32_t w, uint32_t h)
{
    return w * h * 3 / 2;  // 3: nom of ratio, 2: denom of ratio
}

inline bool IsSecureMode(const std::string &name)
{
    std::string prefix = ".secure";
    if (name.length() <= prefix.length()) {
        return false;
    }
    return (name.rfind(prefix) == (name.length() - prefix.length()));
}

template <typename T>
void AppendToVector(std::vector<uint8_t>& vec, const T& param)
{
    size_t beforeSize = vec.size();
    size_t afterSize = beforeSize + sizeof(T);
    vec.resize(afterSize);

    const uint8_t* p = reinterpret_cast<const uint8_t*>(&param);
    std::copy(p, p + sizeof(T), vec.begin() + beforeSize);
}

struct BinaryReader {
    BinaryReader(uint8_t* data, size_t size) : mData(data), mSize(size) {}

    template<typename T>
    T* Read()
    {
        if (mData == nullptr) {
            return nullptr;
        }
        size_t oldPos = mCurrPos;
        size_t newPos = mCurrPos + sizeof(T);
        if (newPos > mSize) {
            return nullptr;
        }
        mCurrPos = newPos;
        return reinterpret_cast<T*>(mData + oldPos);
    }

private:
    uint8_t* mData = nullptr;
    size_t mSize;
    size_t mCurrPos = 0;
};

}
#endif // HCODEC_UTILS_H