/*

 * 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.

 */



#ifndef BLOCKS_DIFF_H

#define BLOCKS_DIFF_H



#include <iostream>

#include <vector>

#include "bzip2_adapter.h"

#include "diffpatch.h"

#include "pkg_manager.h"

#include "securec.h"



namespace UpdatePatch {

class BlocksPatch {

public:

    BlocksPatch() = delete;

    explicit BlocksPatch(const PatchBuffer &patchInfo) : patchInfo_(patchInfo) {}

    virtual ~BlocksPatch() {}



    int32_t ApplyPatch();

protected:

    int32_t ReadControlData(ControlData &ctrlData);



    virtual int32_t ReadHeader(int64_t &controlDataSize, int64_t &diffDataSize, int64_t &newSize);

    virtual int32_t RestoreDiffData(const ControlData &ctrlData) = 0;

    virtual int32_t RestoreExtraData(const ControlData &ctrlData) = 0;



    PatchBuffer patchInfo_ { nullptr };

    int64_t newSize_ = { 0 };

    int64_t oldOffset_ { 0 };

    int64_t newOffset_ { 0 };



    std::unique_ptr<BZip2ReadAdapter> controlDataReader_ { nullptr };

    std::unique_ptr<BZip2ReadAdapter> diffDataReader_ { nullptr };

    std::unique_ptr<BZip2ReadAdapter> extraDataReader_ { nullptr };

};



class BlocksBufferPatch : public BlocksPatch {

public:

    BlocksBufferPatch(const PatchBuffer &patchInfo, const BlockBuffer &oldInfo, std::vector<uint8_t> &newData)

        : BlocksPatch(patchInfo), oldInfo_(oldInfo), newData_(newData) {}

    ~BlocksBufferPatch() override {}



private:

    int32_t ReadHeader(int64_t &controlDataSize, int64_t &diffDataSize, int64_t &newSize) override;

    int32_t RestoreDiffData(const ControlData &ctrlData) override;

    int32_t RestoreExtraData(const ControlData &ctrlData) override;



    BlockBuffer oldInfo_ { nullptr, 0 };

    std::vector<uint8_t>  &newData_;

};



class BlocksStreamPatch : public BlocksPatch {

public:

    BlocksStreamPatch(const PatchBuffer &patchInfo,

        Hpackage::PkgManager::StreamPtr stream, UpdatePatchWriterPtr writer)

        : BlocksPatch(patchInfo), stream_(stream), writer_(writer) {}

    ~BlocksStreamPatch() override {}

private:

    int32_t RestoreDiffData(const ControlData &ctrlData) override;

    int32_t RestoreExtraData(const ControlData &ctrlData) override;



    Hpackage::PkgManager::StreamPtr stream_ { nullptr };

    UpdatePatchWriterPtr writer_ { nullptr };

};

} // namespace UpdatePatch

#endif // BLOCKS_DIFF_H