Rework system title handling with up-to-date title list and region detection support. (#6356)

src/core/system_titles.h

@@ -0,0 +1,28 @@
+// Copyright 2023 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <vector>
+#include "common/common_types.h"
+
+namespace Core {
+
+constexpr u32 NUM_SYSTEM_TITLE_REGIONS = 7;
+
+enum SystemTitleSet : u32 { Minimal = 1 << 0, Old3ds = 1 << 1, New3ds = 1 << 2 };
+
+/// Returns a list of firmware title IDs for a specific set and region.
+std::vector<u64> GetSystemTitleIds(SystemTitleSet set, u32 region);
+
+/// Gets the home menu title ID for a specific region.
+u64 GetHomeMenuTitleId(u32 region);
+
+/// Gets the home menu NCCH path for a specific region.
+std::string GetHomeMenuNcchPath(u32 region);
+
+/// Returns the region of a system title, if it can be determined.
+std::optional<u32> GetSystemTitleRegion(u64 title_id);
+
+} // namespace Core