gui: add basic gui code.

Struct/InfoDirFile.h

@@ -0,0 +1,55 @@
+#ifndef INFO_DIR_FILE_H
+#define INFO_DIR_FILE_H
+
+#include <QBuffer>
+#include <QDataStream>
+#include <QIODevice>
+#include <QString>
+#include <QVector>
+
+enum FileType : uint32_t { None = 0, File, Dir, Link, Other };
+
+struct DirFileInfo {
+    QString name;
+    quint64 size{};
+    FileType type = None;
+    QString fullPath;
+    quint16 permission{};
+    quint64 lastModified{};
+
+    void serialize(QDataStream& data) const
+    {
+        data << name << size << type << fullPath << permission << lastModified;
+    }
+
+    void deserialize(QDataStream& data)
+    {
+        data >> name >> size >> type >> fullPath >> permission >> lastModified;
+    }
+};
+
+QDataStream& operator<<(QDataStream& data, const DirFileInfo& info);
+QDataStream& operator>>(QDataStream& data, DirFileInfo& info);
+
+struct DirFileInfoVec {
+    QVector<DirFileInfo> vec;
+
+    void serialize(QDataStream& data) const
+    {
+        data << vec.size();
+        for (const auto& info : vec) {
+            data << info;
+        }
+    }
+    void deserialize(QDataStream& data)
+    {
+        qsizetype size;
+        data >> size;
+        vec.resize(size);
+        for (quint32 i = 0; i < size; ++i) {
+            data >> vec[i];
+        }
+    }
+};
+
+#endif   // INFO_DIR_FILE_H