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https://github.com/SerenityOS/serenity.git
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106 lines
2.2 KiB
C++
106 lines
2.2 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/EnumBits.h>
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#include <AK/Types.h>
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namespace Kernel {
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struct [[gnu::packed]] FAT32BootRecord {
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u8 boot_jump[3];
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char oem_identifier[8];
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u16 bytes_per_sector;
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u8 sectors_per_cluster;
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u16 reserved_sector_count;
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u8 fat_count;
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u16 root_directory_entry_count;
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u16 unused1;
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u8 media_descriptor_type;
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u16 unused2;
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u16 sectors_per_track;
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u16 head_count;
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u32 hidden_sector_count;
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u32 sector_count;
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u32 sectors_per_fat;
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u16 flags;
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u16 fat_version;
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u32 root_directory_cluster;
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u16 fs_info_sector;
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u16 backup_boot_sector;
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u8 unused3[12];
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u8 drive_number;
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u8 unused4;
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u8 signature;
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u32 volume_id;
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char volume_label_string[11];
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char system_identifier_string[8];
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};
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static_assert(sizeof(FAT32BootRecord) == 90);
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enum class FATAttributes : u8 {
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ReadOnly = 0x01,
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Hidden = 0x02,
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System = 0x04,
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VolumeID = 0x08,
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Directory = 0x10,
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Archive = 0x20,
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LongFileName = 0x0F
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};
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AK_ENUM_BITWISE_OPERATORS(FATAttributes);
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union FATPackedTime {
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u16 value;
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struct {
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u16 second : 5;
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u16 minute : 6;
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u16 hour : 5;
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};
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};
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static_assert(sizeof(FATPackedTime) == 2);
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union FATPackedDate {
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u16 value;
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struct {
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u16 day : 5;
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u16 month : 4;
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u16 year : 7;
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};
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};
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static_assert(sizeof(FATPackedDate) == 2);
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struct [[gnu::packed]] FATEntry {
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char filename[8];
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char extension[3];
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FATAttributes attributes;
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u8 unused1;
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u8 creation_time_seconds;
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FATPackedTime creation_time;
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FATPackedDate creation_date;
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FATPackedDate last_accessed_date;
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u16 first_cluster_high;
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FATPackedTime modification_time;
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FATPackedDate modification_date;
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u16 first_cluster_low;
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u32 file_size;
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};
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static_assert(sizeof(FATEntry) == 32);
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struct [[gnu::packed]] FATLongFileNameEntry {
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u8 entry_index;
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u16 characters1[5];
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FATAttributes attributes;
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u8 entry_type;
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u8 checksum;
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u16 characters2[6];
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u16 zero;
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u16 characters3[2];
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};
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static_assert(sizeof(FATLongFileNameEntry) == 32);
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}
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