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);
}
}
}
}
private void UpdateMetadata()
{
if (!_file.Context.ReadOnly)
{
// Update the standard information attribute - so it reflects the actual file state
if (_isDirty)
{
_file.Modified();
}
else
{
_file.Accessed();
}
// Update the directory entry used to open the file, so it's accurate
_entry.UpdateFrom(_file);
// Write attribute changes back to the Master File Table
_file.UpdateRecordInMft();
_isDirty = false;
}
}
private static void UpdateStandardInformation(DirectoryEntry dirEntry, File file, StandardInformationModifier modifier)
{
// Update the standard information attribute - so it reflects the actual file state
NtfsStream stream = file.GetStream(AttributeType.StandardInformation, null);
StandardInformation si = stream.GetContent<StandardInformation>();
modifier(si);
stream.SetContent(si);
// Update the directory entry used to open the file, so it's accurate
dirEntry.UpdateFrom(file);
// Write attribute changes back to the Master File Table
file.UpdateRecordInMft();
}
