mirror of
https://github.com/RGBCube/serenity
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d7b6cc6421
Our existing implementation did not check the element type of the other pointer in the constructors and move assignment operators. This meant that some operations that would require explicit casting on raw pointers were done implicitly, such as: - downcasting a base class to a derived class (e.g. `Kernel::Inode` => `Kernel::ProcFSDirectoryInode` in Kernel/ProcFS.cpp), - casting to an unrelated type (e.g. `Promise<bool>` => `Promise<Empty>` in LibIMAP/Client.cpp) This, of course, allows gross violations of the type system, and makes the need to type-check less obvious before downcasting. Luckily, while adding the `static_ptr_cast`s, only two truly incorrect usages were found; in the other instances, our casts just needed to be made explicit.
57 lines
1.9 KiB
C++
57 lines
1.9 KiB
C++
/*
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* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Function.h>
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#include <AK/RefCounted.h>
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#include <AK/RefPtr.h>
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#include <AK/StringView.h>
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#include <AK/Types.h>
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#include <Kernel/FileSystem/File.h>
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#include <Kernel/FileSystem/FileSystem.h>
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#include <Kernel/Forward.h>
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#include <Kernel/KResult.h>
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namespace Kernel {
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class SysFSComponent : public RefCounted<SysFSComponent> {
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public:
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virtual StringView name() const { return m_name->view(); }
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virtual KResultOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer&, FileDescription*) const { VERIFY_NOT_REACHED(); }
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virtual KResult traverse_as_directory(unsigned, Function<bool(FileSystem::DirectoryEntryView const&)>) const { VERIFY_NOT_REACHED(); }
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virtual RefPtr<SysFSComponent> lookup(StringView) { VERIFY_NOT_REACHED(); };
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virtual KResultOr<size_t> write_bytes(off_t, size_t, UserOrKernelBuffer const&, FileDescription*) { return EROFS; }
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virtual NonnullRefPtr<SysFSInode> to_inode(SysFS const&) const;
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InodeIndex component_index() const { return m_component_index; };
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virtual ~SysFSComponent() = default;
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protected:
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explicit SysFSComponent(StringView name);
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private:
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NonnullOwnPtr<KString> m_name;
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InodeIndex m_component_index {};
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};
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class SysFSDirectory : public SysFSComponent {
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public:
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virtual KResult traverse_as_directory(unsigned, Function<bool(FileSystem::DirectoryEntryView const&)>) const override;
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virtual RefPtr<SysFSComponent> lookup(StringView name) override;
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virtual NonnullRefPtr<SysFSInode> to_inode(SysFS const& sysfs_instance) const override final;
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protected:
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explicit SysFSDirectory(StringView name);
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SysFSDirectory(StringView name, SysFSDirectory const& parent_directory);
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NonnullRefPtrVector<SysFSComponent> m_components;
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RefPtr<SysFSDirectory> m_parent_directory;
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};
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}
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