private void InitializeNTFS()
{
// Read $BOOT
if (Provider.MftFileOnly)
{
Boot = new BootSector();
Boot.OEMCode = "NTFS";
Boot.SectorsPrCluster = 2; // Small cluster
Boot.BytesPrSector = 512; // Smallest possible sector
// Get FileRecord size (read first record's size)
byte[] mft_data = new byte[512];
Provider.ReadBytes(mft_data, 0, 0, mft_data.Length);
Boot.MFTRecordSizeBytes = FileRecord.ParseAllocatedSize(mft_data, 0);
mft_data = null;
}
else
{
byte[] drive_data = new byte[512];
Provider.ReadBytes(drive_data, 0, 0, 512);
Boot = BootSector.ParseData(drive_data, 512, 0);
drive_data = null;
Debug.Assert(Boot.OEMCode == "NTFS");
}
// Get FileRecord size
BytesPrFileRecord = Boot.MFTRecordSizeBytes;
_sectorsPrRecord = BytesPrFileRecord / BytesPrSector;
Debug.WriteLine($"Updated BytesPrFileRecord, now set to {BytesPrFileRecord}");
// Prep cache
MftRawCache = new RawDiskCache(0);
// Read $MFT file record
byte[] record_data = ReadMFTRecordData((uint)SpecialMFTFiles.MFT);
FileMFT = ParseMFTRecord(record_data);
record_data = null;
Debug.Assert(FileMFT != null);
Debug.Assert(FileMFT.Attributes.Count(s => s.Type == AttributeType.DATA) == 1);
AttributeData fileMftData = FileMFT.Attributes.OfType <AttributeData>().Single();
Debug.Assert(fileMftData.NonResidentFlag == ResidentFlag.NonResident);
Debug.Assert(fileMftData.DataFragments.Length >= 1);
MftStream = OpenFileRecord(FileMFT);
// Prep cache
long maxLength = MftStream.Length;
long toAllocateForCache = Math.Min(maxLength, _rawDiskCacheSizeRecords * BytesPrFileRecord);
MftRawCache = new RawDiskCache((int)toAllocateForCache);
// Get number of FileRecords
FileRecordCount = (uint)((fileMftData.DataFragments.Sum(s => (float)s.Clusters)) * (BytesPrCluster * 1f / BytesPrFileRecord));
FileRecords = new WeakReference[FileRecordCount];
FileRecords[0] = new WeakReference(FileMFT);
// Read $VOLUME file record
FileRecord fileVolume = ReadMFTRecord(SpecialMFTFiles.Volume);
// Get version
Attribute versionAttrib = fileVolume.Attributes.SingleOrDefault(s => s.Type == AttributeType.VOLUME_INFORMATION);
if (versionAttrib != null)
{
AttributeVolumeInformation attrib = (AttributeVolumeInformation)versionAttrib;
NTFSVersion = new Version(attrib.MajorVersion, attrib.MinorVersion);
}
}