Add WiiSaveBanner class

This class is similar to the BannerLoaderWii class that was
removed in ee694e32.

Source/Core/DiscIO/WiiSaveBanner.h

@@ -0,0 +1,41 @@
+// Copyright 2017 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <string>
+#include <vector>
+
+#include "Common/CommonTypes.h"
+
+namespace DiscIO
+{
+class WiiSaveBanner
+{
+public:
+  explicit WiiSaveBanner(u64 title_id);
+  explicit WiiSaveBanner(const std::string& path);
+
+  bool IsValid() const { return m_valid; }
+  const std::string& GetPath() const { return m_path; }
+  std::string GetName() const;
+  std::string GetDescription() const;
+
+  std::vector<u32> GetBanner(int* width, int* height) const;
+
+private:
+  struct Header
+  {
+    char magic[4];  // "WIBN"
+    u32 flags;
+    u16 animation_speed;
+    u8 unused[22];
+    char16_t name[32];
+    char16_t description[32];
+  } m_header;
+
+  bool m_valid;
+  std::string m_path;
+};
+}