1 files changed, 46 insertions, 0 deletions
diff --git a/src/core/file_sys/vfs/vfs_layered.h b/src/core/file_sys/vfs/vfs_layered.h
new file mode 100644
index 000000000..0027ffa9a
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+++ b/src/core/file_sys/vfs/vfs_layered.h
@@ -0,0 +1,46 @@
+// SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <memory>
+#include "core/file_sys/vfs/vfs.h"
+
+namespace FileSys {
+
+// Class that stacks multiple VfsDirectories on top of each other, attempting to read from the first
+// one and falling back to the one after. The highest priority directory (overwrites all others)
+// should be element 0 in the dirs vector.
+class LayeredVfsDirectory : public VfsDirectory {
+    explicit LayeredVfsDirectory(std::vector<VirtualDir> dirs_, std::string name_);
+
+public:
+    ~LayeredVfsDirectory() override;
+
+    /// Wrapper function to allow for more efficient handling of dirs.size() == 0, 1 cases.
+    static VirtualDir MakeLayeredDirectory(std::vector<VirtualDir> dirs, std::string name = "");
+
+    VirtualFile GetFileRelative(std::string_view path) const override;
+    VirtualDir GetDirectoryRelative(std::string_view path) const override;
+    VirtualFile GetFile(std::string_view file_name) const override;
+    VirtualDir GetSubdirectory(std::string_view subdir_name) const override;
+    std::string GetFullPath() const override;
+
+    std::vector<VirtualFile> GetFiles() const override;
+    std::vector<VirtualDir> GetSubdirectories() const override;
+    bool IsWritable() const override;
+    bool IsReadable() const override;
+    std::string GetName() const override;
+    VirtualDir GetParentDirectory() const override;
+    VirtualDir CreateSubdirectory(std::string_view subdir_name) override;
+    VirtualFile CreateFile(std::string_view file_name) override;
+    bool DeleteSubdirectory(std::string_view subdir_name) override;
+    bool DeleteFile(std::string_view file_name) override;
+    bool Rename(std::string_view new_name) override;
+
+private:
+    std::vector<VirtualDir> dirs;
+    std::string name;
+};
+
+} // namespace FileSys