ace_ace_engine/adapter/common/cpp/file_asset_provider.cpp

/*
 * Copyright (c) 2021 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 "adapter/common/cpp/file_asset_provider.h"

#include <limits>

#include "base/log/ace_trace.h"
#include "base/log/log.h"

namespace OHOS::Ace {

FileAssetProvider::~FileAssetProvider()
{
}

bool FileAssetProvider::Initialize(const std::string& packagePath, const std::vector<std::string>& assetBasePaths)
{
    ACE_SCOPED_TRACE("Initialize");
    if (packagePath.empty() || assetBasePaths.empty()) {
        LOGE("the packagePath or assetBasePath is empty");
        return false;
    }
    assetBasePaths_ = assetBasePaths;
    packagePath_ = packagePath;
    return true;
}

bool FileAssetProvider::IsValid() const
{
    return true;
}

class FileAssetMapping : public fml::Mapping {
public:
    FileAssetMapping(std::unique_ptr<uint8_t[]> data, size_t size) : data_(std::move(data)), size_(size) {}

    ~FileAssetMapping() override {}

    size_t GetSize() const override
    {
        return size_;
    }

    const uint8_t* GetMapping() const override
    {
        return data_.get();
    }

private:
    std::unique_ptr<uint8_t[]> data_ = nullptr;
    size_t size_ = 0;
};

std::unique_ptr<fml::Mapping> FileAssetProvider::GetAsMapping(const std::string& assetName) const
{
    ACE_SCOPED_TRACE("GetAsMapping");
    LOGD("assert name is: %{public}s", assetName.c_str());
    std::lock_guard<std::mutex> lock(mutex_);

    for (const auto& basePath: assetBasePaths_) {
        std::string fileName = packagePath_ + basePath + assetName;
        std::FILE* fp = std::fopen(fileName.c_str(), "r");
        if (fp == nullptr) {
            continue;
        }

        if (std::fseek(fp, 0, SEEK_END) != 0) {
            LOGE("seek file tail error");
            std::fclose(fp);
            continue;
        }

        long size = std::ftell(fp);
        uint8_t* dataArray = new (std::nothrow) uint8_t[size];
        if (dataArray == nullptr) {
            LOGE("new uint8_t array failed");
            std::fclose(fp);
            continue;
        }

        rewind(fp);
        std::unique_ptr<uint8_t[]> data(dataArray);
        size_t result = std::fread(data.get(), 1, size, fp);
        if (result != (size_t)size) {
            LOGE("read file failed");
            std::fclose(fp);
            continue;
        }

        fclose(fp);
        return std::make_unique<FileAssetMapping>(std::move(data), size);
    }
    return nullptr;
}

std::string FileAssetProvider::GetAssetPath(const std::string& assetName)
{
    auto filePath = filePathMap_.find(assetName);
    if (filePath == filePathMap_.end()) {
        return "";
    }
    std::string assetPath;
    assetPath.append(packagePath_).append("!/").append(filePath->second);
    return assetPath;
}

} // namespace OHOS::Ace