/// <summary>
/// Reads a sequence of bytes from the current stream and advances the position within the stream by the number of
/// bytes read.
/// </summary>
/// <returns>
/// The total number of bytes read into the buffer. This can be less than the number of bytes requested if that
/// many bytes are not currently available, or zero (0) if the end of the stream has been reached.
/// </returns>
/// <param name="buffer">
/// An array of bytes. When this method returns, the buffer contains the specified byte array with the
/// values between <paramref name="offset" /> and (<paramref name="offset" /> + <paramref name="count" /> - 1) replaced
/// by the bytes read from the current source.
/// </param>
/// <param name="offset">
/// The zero-based byte offset in <paramref name="buffer" /> at which to begin storing the data read
/// from the current stream.
/// </param>
/// <param name="count">The maximum number of bytes to be read from the current stream.</param>
public override int Read(byte[] buffer, int offset, int count)
{
ValidateSize(count);
//get the current sector
var currentSector = CurrentSector;
//read the sector from the base stream
var ret = base.Read(_tempBuffer, 0, count);
if (ret == 0)
{
return(0);
}
if (_decryptor == null)
{
_decryptor = _xts.CreateDecryptor();
}
//decrypt the sector
var retV = _decryptor.TransformBlock(_tempBuffer, 0, ret, buffer, offset, currentSector);
//Console.WriteLine("Decrypting sector {0} == {1} bytes", currentSector, retV);
return(retV);
}
/// <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
var 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);
}
public override void Write(byte[] buffer, int offset, int count)
{
ValidateSize(count);
if (count != 0)
{
ulong currentSector = base.CurrentSector;
if (_encryptor == null)
{
_encryptor = _xts.CreateEncryptor();
}
int count2 = _encryptor.TransformBlock(buffer, offset, count, _tempBuffer, 0, currentSector);
base.Write(_tempBuffer, 0, count2);
}
}
public override int Read(byte[] buffer, int offset, int count)
{
ValidateSize(count);
ulong currentSector = base.CurrentSector;
int num = base.Read(_tempBuffer, 0, count);
if (num == 0)
{
return(0);
}
if (_decryptor == null)
{
_decryptor = _xts.CreateDecryptor();
}
return(_decryptor.TransformBlock(_tempBuffer, 0, num, buffer, offset, currentSector));
}