// The maximum NTFS file size is 2^64 bytes, so total number of file clusters can be represented using long
public void AllocateAdditionalClusters(NTFSVolume volume, long clustersToAllocate)
{
ulong desiredStartLCN = (ulong)DataRunSequence.DataLastLCN;
KeyValuePairList <ulong, long> freeClusterRunList = volume.AllocateClusters(desiredStartLCN, clustersToAllocate);
for (int index = 0; index < freeClusterRunList.Count; index++)
{
ulong runStartLCN = freeClusterRunList[index].Key;
long runLength = freeClusterRunList[index].Value;
bool mergeWithLastRun = (index == 0 && runStartLCN == desiredStartLCN);
if (mergeWithLastRun)
{
// we append this run to the last run
DataRun lastRun = DataRunSequence[DataRunSequence.Count - 1];
lastRun.RunLength += (long)runLength;
HighestVCN += (long)runLength;
}
else
{
DataRun run = new DataRun();
ulong previousLCN = (ulong)DataRunSequence.LastDataRunStartLCN;
run.RunOffset = (long)(runStartLCN - previousLCN);
run.RunLength = (long)runLength;
HighestVCN += runLength;
DataRunSequence.Add(run);
}
}
}
// Data run NULL terminator here
// I've noticed that Windows Server 2003 puts 0x00 0x01 here for the $MFT FileRecord, seems to have no effect
// (I've set it to 0 for the $MFT FileRecord in the MFT and the MFT mirror, and chkdsk did not report a problem.
public NonResidentAttributeRecord(byte[] buffer, int offset) : base(buffer, offset)
{
LowestVCN = (long)LittleEndianConverter.ToUInt64(buffer, offset + 0x10);
HighestVCN = (long)LittleEndianConverter.ToUInt64(buffer, offset + 0x18);
ushort mappingPairsOffset = LittleEndianConverter.ToUInt16(buffer, offset + 0x20);
CompressionUnitSize = LittleEndianConverter.ToUInt16(buffer, offset + 0x22);
ulong allocatedLength = LittleEndianConverter.ToUInt64(buffer, offset + 0x28);
FileSize = LittleEndianConverter.ToUInt64(buffer, offset + 0x30);
ValidDataLength = LittleEndianConverter.ToUInt64(buffer, offset + 0x38);
int position = offset + mappingPairsOffset;
while (position < offset + this.StoredRecordLength)
{
DataRun run = new DataRun();
int length = run.Read(buffer, position);
position += length;
// Length 1 means there was only a header byte (i.e. terminator)
if (length == 1)
{
break;
}
m_dataRunSequence.Add(run);
}
if ((HighestVCN - LowestVCN + 1) != m_dataRunSequence.DataClusterCount)
{
throw new InvalidDataException("Invalid non-resident attribute record");
}
}
public DataRunSequence Clone()
{
DataRunSequence clone = new DataRunSequence(this.Count);
foreach (DataRun run in this)
{
clone.Add(run.Clone());
}
return(clone);
}
