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SystemExposed.h
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SystemExposed.h
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/*
* Copyright (c) 2021, Liav A. <[email protected]>
*
* 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;
InodeIndex component_index() const { return m_component_index; };
virtual ~SystemExposedComponent() = default;
protected:
explicit SystemExposedComponent(StringView name);
private:
NonnullOwnPtr<KString> m_name;
InodeIndex 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;
};
}