/// <summary>
/// Writes a sequence of bytes to the stream and advances the current
/// position within this stream by the number of bytes written.
/// </summary>
/// <remarks>
/// Increments the <see cref="Position"/> property by the number of bytes written.
/// If the updated position is greater than the current length of the stream, then
/// the <see cref="Length"/> property will be updated to be identical to the
/// position.
/// </remarks>
/// <param name="buffer">The buffer to write.</param>
/// <param name="offset">The offset of the first byte to write.</param>
/// <param name="count">The number of bytes to write.</param>
/// <exception cref="System.ArgumentNullException">
/// <paramref name="buffer"/> is <c>null</c>.
/// </exception>
/// <exception cref="System.ArgumentOutOfRangeException">
/// <para><paramref name="offset"/> is less than zero or greater than the length of <paramref name="buffer"/>.</para>
/// <para>-or-</para>
/// <para>The <paramref name="buffer"/> is not large enough to contain <paramref name="count"/> bytes starting
/// at the specified <paramref name="offset"/>.</para>
/// </exception>
/// <exception cref="System.ObjectDisposedException">
/// The stream has been disposed.
/// </exception>
/// <exception cref="System.NotSupportedException">
/// The stream does not support writing.
/// </exception>
/// <exception cref="System.IO.IOException">
/// An I/O error occurred.
/// </exception>
public override void Write(byte[] buffer, int offset, int count)
{
CheckDisposed();
ValidateArguments(buffer, offset, count);
int n = max >= 0 && length + count > max ? max - length : count;
#if ENABLE_NATIVE_DKIM
digest.TransformBlock(buffer, offset, count, null, 0);
#else
digest.BlockUpdate(buffer, offset, n);
#endif
length += n;
}
