界面效果如下：

对外提供的接口如下：

public:

    void setCallback(zp::Callback callback, void* param);

    bool open(const zp::String& path, bool readonly = false);
    bool create(const zp::String& path, const zp::String& inputPath);
    void close();
    bool isOpen() const;

    bool defrag();

    zp::IPackage* getPack() const;

    const zp::Char* packageFilename() const;

    bool enterDir(const zp::String& path);

    //srcPath can't be empty
    //if dstPath is empty, file/dir will be add to current path of package
    bool add(const zp::String& srcPath, const zp::String& dstPath, bool flush = true);

    bool remove(const zp::String& path);
    
    void flush();

    //if srcPath is empty, current path of package will be extracted
    //if dstPath is empty, file/dir will be extracted to current path of system
    bool extract(const zp::String& srcPath, const zp::String& dstPath);

    void setCurrentNode(const ZpNode* node);
    const ZpNode* currentNode() const;
    const ZpNode* rootNode() const;

    const zp::String& currentPath() const;
    void getNodePath(const ZpNode* node, zp::String& path) const;

    zp::u64 countDiskFileSize(const zp::String& path);
    zp::u64 countNodeFileSize(const ZpNode* node);