public unsafe void Open(FileAccess desiredAccess)
{
string fileName = String.Format(@"\\.\{0}", mFileName);
mDiskHandle = CreateFile(fileName,
desiredAccess,
FileShare.ReadWrite, // drives must be opened with read and write share access
0,
FileMode.Open,
FileAttributes.Normal,
IntPtr.Zero);
if (mDiskHandle.IsInvalid)
throw new Win32Exception(Marshal.GetLastWin32Error());
if (desiredAccess.HasFlag(FileAccess.Write))
{
// Unmount & lock the drive
uint pByteReturned = 0;
bool ret = DeviceIoControl(mDiskHandle, FSCTL_DISMOUNT_VOLUME, IntPtr.Zero, 0, IntPtr.Zero, 0, out pByteReturned, IntPtr.Zero);
if (!ret)
throw new Win32Exception(Marshal.GetLastWin32Error());
ret = DeviceIoControl(mDiskHandle, FSCTL_LOCK_VOLUME, IntPtr.Zero, 0, IntPtr.Zero, 0, out pByteReturned, IntPtr.Zero);
if (!ret)
throw new Win32Exception(Marshal.GetLastWin32Error());
}
InStream = new FileStream(mDiskHandle, desiredAccess);
{
binaryReader = new BinaryReader(InStream);
{
bootSector = Utils.ByteToType<FATBS>(binaryReader);
//TODO: Check jmpSector for valid FAT
ulong rootDirSectors = (ulong)((bootSector.root_entry_count * 32) + (bootSector.bytes_per_sector - 1)) / bootSector.bytes_per_sector;
if (rootDirSectors == 0)
type = Type.FAT32;
if (type == Type.FAT32)
fat32ExtBS = Utils.ByteToType<FAT32ExtBS>(binaryReader);
else
fat16ExtBS = Utils.ByteToType<FAT16ExtBS>(binaryReader);
uint tableSize = 0;
if (bootSector.table_size_16 != 0)
tableSize = bootSector.table_size_16;
else
tableSize = fat32ExtBS.table_size_32;
ulong firstDataSector = (ulong)(bootSector.reserved_sector_count + (bootSector.table_count * tableSize) + rootDirSectors);
uint totalSectors;
if (bootSector.total_sectors_16 != 0)
totalSectors = bootSector.total_sectors_16;
else
totalSectors = bootSector.total_sectors_32;
ulong dataSectors = (ulong)totalSectors - (bootSector.reserved_sector_count + (bootSector.table_count * tableSize) + rootDirSectors);
ulong totalClusters = (ulong)(dataSectors / bootSector.sectors_per_cluster);
if (totalClusters < 4085)
type = Type.FAT12;
else if (totalClusters < 65525)
type = Type.FAT16;
else
type = Type.FAT32;
if (type == Type.FAT12)
throw new NotSupportedException("FAT12 is not supported");
logger.Log("Detected new partition: {0}", new object[] { type });
if (type == Type.FAT16)
fatImplementation = new FAT16(mFileName, bootSector, fat16ExtBS, binaryReader, InStream, logger);
else
fatImplementation = new FAT32(mFileName, bootSector, fat32ExtBS, binaryReader, InStream, logger);
fatImplementation.rootDirSectors = rootDirSectors;
fatImplementation.tableSize = tableSize;
fatImplementation.totalClusters = totalClusters;
fatImplementation.totalSectors = totalSectors;
fatImplementation.dataSectors = dataSectors;
fatImplementation.firstDataSector = firstDataSector;
fatImplementation.mbrOffsetInByte = 0;
logger.Log("Table size: {0}", new object[] { tableSize });
logger.Log("Clusters: {0}", new object[] { totalClusters });
logger.Log("Sectors: {0}", new object[] { totalSectors });
logger.Log("");
logger.Log("Reading FAT...");
fatImplementation.ReadRootDirectory();
logger.Log("Reading done.");
}
}
}
public FAT(string drive, FATBS bootSector, BinaryReader reader, Stream stream, ILogger logger)
{
this.bootSector = bootSector;
this.reader = reader;
this.stream = stream;
this.logger = logger;
rootDirectory = new Directory()
{
name = drive
};
}
