Start working on FAT formatter

2025-03-16 13:51:50 -04:00
parent 642fd5e1ed
commit 87cf731f0b
6 changed files with 127 additions and 1 deletions
--- a/BadBuilder.Formatter/FAT32BootSector.cs
+++ b/BadBuilder.Formatter/FAT32BootSector.cs
@@ -0,0 +1,49 @@
+using System.Runtime.InteropServices;
+
+namespace BadBuilder.Formatter
+{
+    [StructLayout(LayoutKind.Sequential, Pack = 1)]
+    internal struct FAT32BootSector
+    {
+        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
+        public byte[] JumpCode;
+
+        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
+        public byte[] 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)
+
+        // FAT32-specific fields
+        public uint SectorsPerFAT;
+        public ushort FATFlags;
+        public ushort FileSystemVersion;
+        public uint RootCluster;
+        public ushort FSInfoSector;
+        public ushort BackupBootSector;
+
+        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 12)]
+        public byte[] Reserved;
+
+        public byte DriveNumber;
+        public byte Reserved1;
+        public byte BootSignature;
+        public uint VolumeID;
+
+        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 11)]
+        public byte[] VolumeLabel;
+
+        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
+        public byte[] FileSystemType;
+    }
+}