/// <summary>
/// Reads eight-bytes signed value from the underlaying stream.
/// </summary>
/// <returns><see cref="long"/> read</returns>
/// <exception cref="IOException">Thrown when end of stream was reached and <see cref="Unsecure"/> is false.</exception>
public long ReadLong()
{
AssertRead(8, "Long");
return(BE ? ByteUtils.ToLongBE(buffer) : ByteUtils.ToLongLE(buffer));
}