class Decompressor
{
protected:
    ImgWithParam* img;
public:
    Decompressor(ImgWithParam* img): img(img){};
    virtual void decompress()=0;
};

class XdDecompressor : public Decompressor
{
    const Dictionary* dictionary;
public:
    XdDecompressor(ImgWithParam* img, const Dictionary* dict): XdDecompressor(img), dictionary(dict){};
    void decompress() override;
};