1 files changed, 148 insertions, 0 deletions
diff --git a/src/core/file_sys/vfs/vfs_real.h b/src/core/file_sys/vfs/vfs_real.h
new file mode 100644
index 000000000..5c2172cce
--- /dev/null
+++ b/src/core/file_sys/vfs/vfs_real.h
@@ -0,0 +1,148 @@
+// SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <map>
+#include <mutex>
+#include <optional>
+#include <string_view>
+#include "common/intrusive_list.h"
+#include "core/file_sys/fs_filesystem.h"
+#include "core/file_sys/vfs/vfs.h"
+
+namespace Common::FS {
+class IOFile;
+}
+
+namespace FileSys {
+
+struct FileReference : public Common::IntrusiveListBaseNode<FileReference> {
+    std::shared_ptr<Common::FS::IOFile> file{};
+};
+
+class RealVfsFile;
+class RealVfsDirectory;
+
+class RealVfsFilesystem : public VfsFilesystem {
+public:
+    RealVfsFilesystem();
+    ~RealVfsFilesystem() override;
+
+    std::string GetName() const override;
+    bool IsReadable() const override;
+    bool IsWritable() const override;
+    VfsEntryType GetEntryType(std::string_view path) const override;
+    VirtualFile OpenFile(std::string_view path, OpenMode perms = OpenMode::Read) override;
+    VirtualFile CreateFile(std::string_view path, OpenMode perms = OpenMode::ReadWrite) override;
+    VirtualFile CopyFile(std::string_view old_path, std::string_view new_path) override;
+    VirtualFile MoveFile(std::string_view old_path, std::string_view new_path) override;
+    bool DeleteFile(std::string_view path) override;
+    VirtualDir OpenDirectory(std::string_view path, OpenMode perms = OpenMode::Read) override;
+    VirtualDir CreateDirectory(std::string_view path,
+                               OpenMode perms = OpenMode::ReadWrite) override;
+    VirtualDir CopyDirectory(std::string_view old_path, std::string_view new_path) override;
+    VirtualDir MoveDirectory(std::string_view old_path, std::string_view new_path) override;
+    bool DeleteDirectory(std::string_view path) override;
+
+private:
+    using ReferenceListType = Common::IntrusiveListBaseTraits<FileReference>::ListType;
+    std::map<std::string, std::weak_ptr<VfsFile>, std::less<>> cache;
+    ReferenceListType open_references;
+    ReferenceListType closed_references;
+    std::mutex list_lock;
+    size_t num_open_files{};
+
+private:
+    friend class RealVfsFile;
+    std::unique_lock<std::mutex> RefreshReference(const std::string& path, OpenMode perms,
+                                                  FileReference& reference);
+    void DropReference(std::unique_ptr<FileReference>&& reference);
+
+private:
+    friend class RealVfsDirectory;
+    VirtualFile OpenFileFromEntry(std::string_view path, std::optional<u64> size,
+                                  OpenMode perms = OpenMode::Read);
+
+private:
+    void EvictSingleReferenceLocked();
+    void InsertReferenceIntoListLocked(FileReference& reference);
+    void RemoveReferenceFromListLocked(FileReference& reference);
+};
+
+// An implementation of VfsFile that represents a file on the user's computer.
+class RealVfsFile : public VfsFile {
+    friend class RealVfsDirectory;
+    friend class RealVfsFilesystem;
+
+public:
+    ~RealVfsFile() override;
+
+    std::string GetName() const override;
+    std::size_t GetSize() const override;
+    bool Resize(std::size_t new_size) override;
+    VirtualDir GetContainingDirectory() const override;
+    bool IsWritable() const override;
+    bool IsReadable() const override;
+    std::size_t Read(u8* data, std::size_t length, std::size_t offset) const override;
+    std::size_t Write(const u8* data, std::size_t length, std::size_t offset) override;
+    bool Rename(std::string_view name) override;
+
+private:
+    RealVfsFile(RealVfsFilesystem& base, std::unique_ptr<FileReference> reference,
+                const std::string& path, OpenMode perms = OpenMode::Read,
+                std::optional<u64> size = {});
+
+    RealVfsFilesystem& base;
+    std::unique_ptr<FileReference> reference;
+    std::string path;
+    std::string parent_path;
+    std::vector<std::string> path_components;
+    std::optional<u64> size;
+    OpenMode perms;
+};
+
+// An implementation of VfsDirectory that represents a directory on the user's computer.
+class RealVfsDirectory : public VfsDirectory {
+    friend class RealVfsFilesystem;
+
+public:
+    ~RealVfsDirectory() override;
+
+    VirtualFile GetFileRelative(std::string_view relative_path) const override;
+    VirtualDir GetDirectoryRelative(std::string_view relative_path) const override;
+    VirtualFile GetFile(std::string_view name) const override;
+    VirtualDir GetSubdirectory(std::string_view name) const override;
+    VirtualFile CreateFileRelative(std::string_view relative_path) override;
+    VirtualDir CreateDirectoryRelative(std::string_view relative_path) override;
+    bool DeleteSubdirectoryRecursive(std::string_view name) override;
+    std::vector<VirtualFile> GetFiles() const override;
+    FileTimeStampRaw GetFileTimeStamp(std::string_view path) 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 name) override;
+    VirtualFile CreateFile(std::string_view name) override;
+    bool DeleteSubdirectory(std::string_view name) override;
+    bool DeleteFile(std::string_view name) override;
+    bool Rename(std::string_view name) override;
+    std::string GetFullPath() const override;
+    std::map<std::string, VfsEntryType, std::less<>> GetEntries() const override;
+
+private:
+    RealVfsDirectory(RealVfsFilesystem& base, const std::string& path,
+                     OpenMode perms = OpenMode::Read);
+
+    template <typename T, typename R>
+    std::vector<std::shared_ptr<R>> IterateEntries() const;
+
+    RealVfsFilesystem& base;
+    std::string path;
+    std::string parent_path;
+    std::vector<std::string> path_components;
+    OpenMode perms;
+};
+
+} // namespace FileSys