/// <summary>
/// Return list of free cluster runs.
/// </summary>
/// <returns>key is cluster LCN, value is run length</returns>
private KeyValuePairList <long, long> FindClustersToAllocate(long desiredStartLCN, long numberOfClusters)
{
KeyValuePairList <long, long> result = new KeyValuePairList <long, long>();
long leftToFind;
long endLCN = m_numberOfClustersInVolume - 1;
KeyValuePairList <long, long> segment = FindClustersToAllocate(desiredStartLCN, endLCN, numberOfClusters, out leftToFind);
result.AddRange(segment);
if (leftToFind > 0 && desiredStartLCN > 0)
{
segment = FindClustersToAllocate(0, desiredStartLCN - 1, leftToFind, out leftToFind);
result.AddRange(segment);
}
if (leftToFind > 0)
{
return(null);
}
return(result);
}
/// <summary>
/// Return list of free cluster runs, key is cluster LCN, value is run length
/// </summary>
private KeyValuePairList <ulong, long> FindClustersToAllocate(ulong desiredStartLCN, long numberOfClusters)
{
KeyValuePairList <ulong, long> result = new KeyValuePairList <ulong, long>();
long leftToAllocate;
ulong endLCN = (ulong)(m_volume.Size / m_volume.BytesPerCluster) - 1;
KeyValuePairList <ulong, long> segment = FindClustersToAllocate(desiredStartLCN, endLCN, numberOfClusters, out leftToAllocate);
result.AddRange(segment);
if (leftToAllocate > 0 && desiredStartLCN > 0)
{
segment = FindClustersToAllocate(0, desiredStartLCN - 1, leftToAllocate, out leftToAllocate);
result.AddRange(segment);
}
if (leftToAllocate > 0)
{
throw new Exception("Could not allocate clusters. Not enough free disk space");
}
return(result);
}
public static void XTSChainDecrypt(KeyValuePairList <SymmetricAlgorithm, byte[]> algorithmChain, ulong dataUnitIndex, byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int outputOffset)
{
Array.Copy(inputBuffer, inputOffset, outputBuffer, outputOffset, inputCount);
KeyValuePairList <SymmetricAlgorithm, byte[]> reversedChain = new KeyValuePairList <SymmetricAlgorithm, byte[]>();
reversedChain.AddRange(algorithmChain);
reversedChain.Reverse();
foreach (KeyValuePair <SymmetricAlgorithm, byte[]> algorithm in reversedChain)
{
byte[] key1 = new byte[32];
byte[] key2 = new byte[32];
Array.Copy(algorithm.Value, 0, key1, 0, 32);
Array.Copy(algorithm.Value, 32, key2, 0, 32);
XTSDecrypt(algorithm.Key, key1, key2, dataUnitIndex, outputBuffer, outputOffset, inputCount, outputBuffer, outputOffset);
}
}
