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More work on FAT32 formatter

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Pdawg11239
2025-03-16 18:40:38 -04:00
parent 87cf731f0b
commit 2a15f045bc
11 changed files with 524 additions and 62 deletions
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69
BadBuilder.Formatter/FAT32BootSector.cs
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@@ -2,48 +2,61 @@
namespace BadBuilder.Formatter
{
[StructLayout(LayoutKind.Sequential, Pack = 1)]
// Reference: https://cscie92.dce.harvard.edu/spring2024/K70F120M/bootSector.h
[StructLayout(LayoutKind.Explicit, Pack = 1, Size = 512)]
internal struct FAT32BootSector
{
[FieldOffset(0)]
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
public byte[] JumpCode;
internal byte[] JumpCode;
[FieldOffset(3)]
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
public byte[] OEMName;
internal char[] OEMName;
public ushort BytesPerSector;
public byte SectorsPerCluster;
public ushort ReservedSectorCount;
public byte NumberOfFATs;
public ushort MaxRootEntries; // Unused in FAT32
public ushort TotalSectors16; // If 0, use TotalSectors
public byte MediaDescriptor;
public ushort SectorsPerFAT16; // Unused in FAT32
public ushort SectorsPerTrack;
public ushort NumberOfHeads;
public uint HiddenSectors;
public uint TotalSectors; // Total sectors (if TotalSectors16 is 0)
[FieldOffset(11)] internal ushort BytesPerSector;
[FieldOffset(13)] internal byte SectorsPerCluster;
[FieldOffset(14)] internal ushort ReservedSectorCount;
[FieldOffset(16)] internal byte NumberOfFATs;
[FieldOffset(17)] internal ushort MaxRootEntries; // Unused in FAT32
[FieldOffset(19)] internal ushort TotalSectors16; // If 0, use TotalSectors
[FieldOffset(21)] internal byte MediaDescriptor;
[FieldOffset(22)] internal ushort SectorsPerFAT16; // Unused in FAT32
[FieldOffset(24)] internal ushort SectorsPerTrack;
[FieldOffset(26)] internal ushort NumberOfHeads;
[FieldOffset(28)] internal uint HiddenSectors;
[FieldOffset(32)] internal uint TotalSectors; // Total sectors (if TotalSectors16 is 0)
// FAT32-specific fields
public uint SectorsPerFAT;
public ushort FATFlags;
public ushort FileSystemVersion;
public uint RootCluster;
public ushort FSInfoSector;
public ushort BackupBootSector;
[FieldOffset(36)] internal uint SectorsPerFAT;
[FieldOffset(40)] internal ushort FATFlags;
[FieldOffset(42)] internal ushort FileSystemVersion;
[FieldOffset(44)] internal uint RootCluster;
[FieldOffset(48)] internal ushort FSInfoSector;
[FieldOffset(50)] internal ushort BackupBootSector;
[FieldOffset(52)]
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 12)]
public byte[] Reserved;
internal byte[] Reserved;
public byte DriveNumber;
public byte Reserved1;
public byte BootSignature;
public uint VolumeID;
[FieldOffset(64)] internal byte DriveNumber;
[FieldOffset(65)] internal byte Reserved1;
[FieldOffset(66)] internal byte BootSignature;
[FieldOffset(67)] internal uint VolumeID;
[FieldOffset(71)]
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 11)]
public byte[] VolumeLabel;
internal char[] VolumeLabel;
[FieldOffset(82)]
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
public byte[] FileSystemType;
internal char[] FileSystemType;
[FieldOffset(90)]
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 420)]
internal byte[] Reserved2;
[FieldOffset(510)] internal ushort Signature;
}
}