抽象多媒体类, 修复gtest问题

include/UtilTool.h

@@ -1,9 +1,27 @@
+#ifndef UTILTOOL_H
+#define UTILTOOL_H
+
 #include <iostream>
 #include <array>
 
+enum class MediaType{
+    VIDEO,
+    AUDIO,
+    IMAGE,
+    UNSUPPORT,
+};
+
 class UtilTool
 {
-public:
-    constexpr static std::array<std::string, 2> ImageType{"jpg","png"};
+private:
+    constexpr static std::array<std::string, 2> ImageTypes{"jpg","png"};
+    constexpr static std::array<std::string, 1> VideoTypes{"mp4"};
+    constexpr static std::array<std::string, 1> AudioTypes{"mp3"};
     static bool CheckFileIsImage(const std::string& filename);
+    static bool CheckFileIsAudio(const std::string& filename);
+    static bool CheckFileIsVideo(const std::string& filename);
+public:
+    static MediaType CheckFileType(const std::string& filename);
 };
+
+#endif // !UTILTOOL_H