46 lines
2.0 KiB
C#
46 lines
2.0 KiB
C#
using System.Runtime.InteropServices;
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namespace BadBuilder.Formatter
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{
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// Reference: https://cscie92.dce.harvard.edu/spring2024/K70F120M/bootSector.h
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[StructLayout(LayoutKind.Explicit, Pack = 1, Size = 512)]
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internal unsafe struct FAT32BootSector
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{
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[FieldOffset(0)] public fixed byte JumpCode[3];
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[FieldOffset(3)] public fixed char OEMName[8];
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[FieldOffset(11)] internal ushort BytesPerSector;
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[FieldOffset(13)] internal byte SectorsPerCluster;
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[FieldOffset(14)] internal ushort ReservedSectorCount;
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[FieldOffset(16)] internal byte NumberOfFATs;
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[FieldOffset(17)] internal ushort MaxRootEntries; // Unused in FAT32
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[FieldOffset(19)] internal ushort TotalSectors16; // If 0, use TotalSectors
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[FieldOffset(21)] internal byte MediaDescriptor;
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[FieldOffset(22)] internal ushort SectorsPerFAT16; // Unused in FAT32
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[FieldOffset(24)] internal ushort SectorsPerTrack;
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[FieldOffset(26)] internal ushort NumberOfHeads;
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[FieldOffset(28)] internal uint HiddenSectors;
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[FieldOffset(32)] internal uint TotalSectors; // Total sectors (if TotalSectors16 is 0)
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// FAT32-specific fields
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[FieldOffset(36)] internal uint SectorsPerFAT;
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[FieldOffset(40)] internal ushort FATFlags;
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[FieldOffset(42)] internal ushort FileSystemVersion;
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[FieldOffset(44)] internal uint RootCluster;
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[FieldOffset(48)] internal ushort FSInfoSector;
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[FieldOffset(50)] internal ushort BackupBootSector;
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[FieldOffset(52)] public fixed byte Reserved[12];
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[FieldOffset(64)] public byte DriveNumber;
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[FieldOffset(65)] public byte Reserved1;
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[FieldOffset(66)] public byte BootSignature;
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[FieldOffset(67)] public uint VolumeID;
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[FieldOffset(71)] public fixed char VolumeLabel[11];
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[FieldOffset(82)] public fixed char FileSystemType[8];
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[FieldOffset(90)] public fixed byte Reserved2[420];
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[FieldOffset(510)] internal ushort Signature;
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}
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} |