1 files changed, 62 insertions, 0 deletions
diff --git a/Kernel/SystemExposed.h b/Kernel/SystemExposed.h
new file mode 100644
index 0000000000..6ef0f29305
--- /dev/null
+++ b/Kernel/SystemExposed.h
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Function.h>
+#include <AK/RefCounted.h>
+#include <AK/RefPtr.h>
+#include <AK/String.h>
+#include <AK/Types.h>
+#include <Kernel/FileSystem/File.h>
+#include <Kernel/FileSystem/FileSystem.h>
+#include <Kernel/KResult.h>
+#include <Kernel/UserOrKernelBuffer.h>
+
+namespace Kernel {
+
+class SysFS;
+class SystemExposedComponent : public RefCounted<SystemExposedComponent> {
+public:
+    virtual KResultOr<size_t> entries_count() const { VERIFY_NOT_REACHED(); };
+    virtual StringView name() const { return m_name->view(); }
+    virtual KResultOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer&, FileDescription*) const { VERIFY_NOT_REACHED(); }
+    virtual KResult traverse_as_directory(unsigned, Function<bool(const FS::DirectoryEntryView&)>) const { VERIFY_NOT_REACHED(); }
+    virtual RefPtr<SystemExposedComponent> lookup(StringView) { VERIFY_NOT_REACHED(); };
+    virtual KResultOr<size_t> write_bytes(off_t, size_t, const UserOrKernelBuffer&, FileDescription*) { return -EROFS; }
+    virtual size_t size() const { return 0; }
+
+    virtual NonnullRefPtr<Inode> to_inode(const SysFS& sysfs_instance) const;
+
+    size_t component_index() const { return m_component_index; };
+
+    virtual ~SystemExposedComponent() = default;
+
+protected:
+    explicit SystemExposedComponent(StringView name);
+
+private:
+    NonnullOwnPtr<KString> m_name;
+    size_t m_component_index;
+};
+
+class SystemExposedFolder : public SystemExposedComponent {
+public:
+    virtual KResultOr<size_t> entries_count() const override { return m_components.size(); };
+    virtual KResult traverse_as_directory(unsigned, Function<bool(const FS::DirectoryEntryView&)>) const override;
+    virtual RefPtr<SystemExposedComponent> lookup(StringView name) override;
+    void add_component(const SystemExposedComponent&);
+
+    virtual NonnullRefPtr<Inode> to_inode(const SysFS& sysfs_instance) const override final;
+
+protected:
+    explicit SystemExposedFolder(String name);
+    SystemExposedFolder(String name, const SystemExposedFolder& parent_folder);
+    NonnullRefPtrVector<SystemExposedComponent> m_components;
+    RefPtr<SystemExposedFolder> m_parent_folder;
+};
+
+}