/// <returns>Record index</returns>
public long?AllocateRecord(long searchStartIndex, long searchEndIndex, uint transactionID)
{
long bufferedVCN = -1;
byte[] bufferedClusterBytes = null;
for (long index = searchStartIndex; index <= searchEndIndex; index++)
{
long currentVCN = index / (Volume.BytesPerCluster * 8);
if (currentVCN != bufferedVCN)
{
bufferedClusterBytes = ReadCluster(currentVCN);
bufferedVCN = currentVCN;
}
int bitOffsetInCluster = (int)(index % (Volume.BytesPerCluster * 8));
if (IsBitClear(bufferedClusterBytes, bitOffsetInCluster))
{
if (!this.AttributeRecord.IsResident)
{
BitmapRange bitmapRange = new BitmapRange((uint)bitOffsetInCluster, 1);
byte[] operationData = bitmapRange.GetBytes();
ulong streamOffset = (ulong)(currentVCN * Volume.BytesPerCluster);
Volume.LogClient.WriteLogRecord(FileRecord.BaseSegmentReference, this.AttributeRecord, streamOffset, Volume.BytesPerCluster, NTFSLogOperation.SetBitsInNonResidentBitMap, operationData, NTFSLogOperation.ClearBitsInNonResidentBitMap, operationData, transactionID);
}
SetBit(bufferedClusterBytes, bitOffsetInCluster);
WriteCluster(currentVCN, bufferedClusterBytes);
return(index);
}
}
return(null);
}
public void DeallocateRecord(long recordIndex, uint transactionID)
{
long currentVCN = recordIndex / (Volume.BytesPerCluster * 8);
int bitOffsetInCluster = (int)(recordIndex % (Volume.BytesPerCluster * 8));
byte[] clusterBytes = ReadCluster(currentVCN);
if (!IsBitClear(clusterBytes, bitOffsetInCluster))
{
if (!this.AttributeRecord.IsResident)
{
BitmapRange bitmapRange = new BitmapRange((uint)bitOffsetInCluster, 1);
byte[] operationData = bitmapRange.GetBytes();
ulong streamOffset = (ulong)(currentVCN * Volume.BytesPerCluster);
Volume.LogClient.WriteLogRecord(FileRecord.BaseSegmentReference, this.AttributeRecord, streamOffset, Volume.BytesPerCluster, NTFSLogOperation.ClearBitsInNonResidentBitMap, operationData, NTFSLogOperation.SetBitsInNonResidentBitMap, operationData, transactionID);
}
ClearBit(clusterBytes, bitOffsetInCluster);
WriteCluster(currentVCN, clusterBytes);
}
}
