public void WriteRecord(FileRecord record)
{
int recordSize = record.Size;
if (recordSize > _recordLength)
{
throw new IOException("Attempting to write over-sized MFT record");
}
byte[] buffer = new byte[_recordLength];
record.ToBytes(buffer, 0);
_recordStream.Position = record.MasterFileTableIndex * (long)_recordLength;
_recordStream.Write(buffer, 0, _recordLength);
_recordStream.Flush();
// We may have modified our own meta-data by extending the data stream, so
// make sure our records are up-to-date.
if (_self.MftRecordIsDirty)
{
DirectoryEntry dirEntry = _self.DirectoryEntry;
if (dirEntry != null)
{
dirEntry.UpdateFrom(_self);
}
_self.UpdateRecordInMft();
}
// Need to update Mirror. OpenRaw is OK because this is short duration, and we don't
// extend or otherwise modify any meta-data, just the content of the Data stream.
if (record.MasterFileTableIndex < 4 && _self.Context.GetFileByIndex != null)
{
File mftMirror = _self.Context.GetFileByIndex(MftMirrorIndex);
if (mftMirror != null)
{
using (Stream s = mftMirror.OpenStream(AttributeType.Data, null, FileAccess.ReadWrite))
{
s.Position = record.MasterFileTableIndex * (long)_recordLength;
s.Write(buffer, 0, _recordLength);
}
}
}
}
public File InitializeNew(INtfsContext context, long firstBitmapCluster, ulong numBitmapClusters, long firstRecordsCluster, ulong numRecordsClusters)
{
BiosParameterBlock bpb = context.BiosParameterBlock;
FileRecord fileRec = new FileRecord(bpb.BytesPerSector, bpb.MftRecordSize, (uint)MftIndex);
fileRec.Flags = FileRecordFlags.InUse;
fileRec.SequenceNumber = 1;
_recordCache[MftIndex] = fileRec;
_self = new File(context, fileRec);
StandardInformation.InitializeNewFile(_self, FileAttributeFlags.Hidden | FileAttributeFlags.System);
NtfsStream recordsStream = _self.CreateStream(AttributeType.Data, null, firstRecordsCluster, numRecordsClusters, (uint)bpb.BytesPerCluster);
_recordStream = recordsStream.Open(FileAccess.ReadWrite);
Wipe(_recordStream);
NtfsStream bitmapStream = _self.CreateStream(AttributeType.Bitmap, null, firstBitmapCluster, numBitmapClusters, (uint)bpb.BytesPerCluster);
using (Stream s = bitmapStream.Open(FileAccess.ReadWrite))
{
Wipe(s);
s.SetLength(8);
_bitmap = new Bitmap(s, long.MaxValue);
}
_recordLength = context.BiosParameterBlock.MftRecordSize;
_bytesPerSector = context.BiosParameterBlock.BytesPerSector;
_bitmap.MarkPresentRange(0, 1);
// Write the MFT's own record to itself
byte[] buffer = new byte[_recordLength];
fileRec.ToBytes(buffer, 0);
_recordStream.Position = 0;
_recordStream.Write(buffer, 0, _recordLength);
_recordStream.Flush();
return _self;
}
