mirror of
https://github.com/RGBCube/serenity
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85 lines
3.4 KiB
C++
85 lines
3.4 KiB
C++
/*
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* Copyright (c) 2022, Undefine <undefine@undefine.pl>
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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/OwnPtr.h>
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#include <AK/RefPtr.h>
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#include <Kernel/FileSystem/FATFS/Definitions.h>
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#include <Kernel/FileSystem/FATFS/FileSystem.h>
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#include <Kernel/FileSystem/Inode.h>
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#include <Kernel/Library/KBuffer.h>
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#include <Kernel/Library/KString.h>
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namespace Kernel {
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class FATInode final : public Inode {
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friend FATFS;
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public:
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virtual ~FATInode() override = default;
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static ErrorOr<NonnullRefPtr<FATInode>> create(FATFS&, FATEntry, Vector<FATLongFileNameEntry> const& = {});
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FATFS& fs() { return static_cast<FATFS&>(Inode::fs()); }
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FATFS const& fs() const { return static_cast<FATFS const&>(Inode::fs()); }
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private:
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FATInode(FATFS&, FATEntry, NonnullOwnPtr<KString> filename);
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size_t fat_offset_for_cluster(u32 cluster) const;
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// Returns cluster number value that indicates the end of the chain
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// has been reached. Any cluster value >= this value indicates this
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// is the last cluster.
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u32 end_of_chain_marker() const;
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// Reads the cluster number located at the offset within the table.
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u32 cluster_number(KBuffer const& fat_sector, u32 entry_cluster_number, u32 entry_offset) const;
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static constexpr u8 end_entry_byte = 0x00;
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static constexpr u8 unused_entry_byte = 0xE5;
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static constexpr u8 lfn_entry_character_termination = 0x00;
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static constexpr u8 lfn_entry_unused_byte = 0xFF;
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static constexpr u8 normal_filename_length = 8;
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static constexpr u8 normal_extension_length = 3;
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static ErrorOr<NonnullOwnPtr<KString>> compute_filename(FATEntry&, Vector<FATLongFileNameEntry> const& = {});
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static StringView byte_terminated_string(StringView, u8);
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ErrorOr<Vector<BlockBasedFileSystem::BlockIndex>> compute_block_list();
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ErrorOr<NonnullOwnPtr<KBuffer>> read_block_list();
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ErrorOr<RefPtr<FATInode>> traverse(Function<ErrorOr<bool>(RefPtr<FATInode>)> callback);
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u32 first_cluster() const;
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// This overload of `first_cluster` does not rely on the base Inode
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// already being created to determine the FAT version. It is used
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// during FATInode creation (create()).
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u32 first_cluster(FATVersion const version) const;
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// ^Inode
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virtual ErrorOr<size_t> write_bytes_locked(off_t, size_t, UserOrKernelBuffer const& data, OpenFileDescription*) override;
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virtual ErrorOr<size_t> read_bytes_locked(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override;
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virtual InodeMetadata metadata() const override;
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virtual ErrorOr<void> traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
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virtual ErrorOr<NonnullRefPtr<Inode>> lookup(StringView name) override;
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virtual ErrorOr<NonnullRefPtr<Inode>> create_child(StringView name, mode_t, dev_t, UserID, GroupID) override;
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virtual ErrorOr<void> add_child(Inode&, StringView name, mode_t) override;
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virtual ErrorOr<void> remove_child(StringView name) override;
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virtual ErrorOr<void> replace_child(StringView name, Inode& child) override;
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virtual ErrorOr<void> chmod(mode_t) override;
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virtual ErrorOr<void> chown(UserID, GroupID) override;
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virtual ErrorOr<void> flush_metadata() override;
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Vector<BlockBasedFileSystem::BlockIndex> m_block_list;
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FATEntry m_entry;
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NonnullOwnPtr<KString> m_filename;
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InodeMetadata m_metadata;
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};
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}
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