1 files changed, 53 insertions, 0 deletions

diff --git a/src/core/hle/service/bcat/backend/backend.h b/src/core/hle/service/bcat/backend/backend.h
new file mode 100644
index 000000000..2e9511f3f
--- /dev/null
+++ b/src/core/hle/service/bcat/backend/backend.h
@@ -0,0 +1,53 @@
+// Copyright 2019 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <functional>
+#include "common/common_types.h"
+#include "core/file_sys/vfs_types.h"
+
+namespace Service::BCAT {
+
+using CompletionCallback = std::function<void(bool)>;
+using DirectoryGetter = std::function<FileSys::VirtualDir(u64)>;
+using Passphrase = std::array<u8, 0x20>;
+
+struct TitleIDVersion {
+    u64 title_id;
+    u64 build_id;
+};
+
+class Backend {
+public:
+    explicit Backend(DirectoryGetter getter);
+    virtual ~Backend();
+
+    virtual bool Synchronize(TitleIDVersion title, CompletionCallback callback) = 0;
+    virtual bool SynchronizeDirectory(TitleIDVersion title, std::string name,
+                                      CompletionCallback callback) = 0;
+
+    virtual bool Clear(u64 title_id) = 0;
+
+    virtual void SetPassphrase(u64 title_id, const Passphrase& passphrase) = 0;
+
+protected:
+    DirectoryGetter dir_getter;
+};
+
+class NullBackend : public Backend {
+public:
+    explicit NullBackend(const DirectoryGetter& getter);
+    ~NullBackend() override;
+
+    bool Synchronize(TitleIDVersion title, CompletionCallback callback) override;
+    bool SynchronizeDirectory(TitleIDVersion title, std::string name,
+                              CompletionCallback callback) override;
+
+    bool Clear(u64 title_id) override;
+
+    void SetPassphrase(u64 title_id, const Passphrase& passphrase) override;
+};
+
+} // namespace Service::BCAT