/// <summary>
/// Writes a sequence of bytes to the current stream and advances the current position within this stream by the number of bytes written.
/// </summary>
/// <param name="buffer">An array of bytes. This method copies <paramref name="count"/> bytes from <paramref name="buffer"/> to the current stream.</param>
/// <param name="offset">The zero-based byte offset in <paramref name="buffer"/> at which to begin copying bytes to the current stream.</param>
/// <param name="count">The number of bytes to be written to the current stream.</param>
public override void Write(byte[] buffer, int offset, int count)
{
ValidateSize(count);
if (count == 0)
{
return;
}
//get the current sector
var currentSector = CurrentSector;
if (_encryptor == null)
{
_encryptor = _xts.CreateEncryptor();
}
//encrypt the sector
int transformedCount = _encryptor.TransformBlock(buffer, offset, count, _tempBuffer, 0, currentSector);
//Console.WriteLine("Encrypting sector {0}", currentSector);
//write it to the base stream
base.Write(_tempBuffer, 0, transformedCount);
}
/// <summary>
/// Creates a new stream
/// </summary>
/// <param name="baseStream">The base stream</param>
/// <param name="xts">The xts transform</param>
/// <param name="sectorSize">Sector size</param>
public XTSWriteOnlyStream(Stream baseStream, Xts xts, int sectorSize = DefaultSectorSize)
{
_baseStream = baseStream;
_encryptor = xts.CreateEncryptor();
_sectorSize = sectorSize;
_encriptedBuffer = new byte[sectorSize];
_sectorBuffer = new byte[sectorSize];
}