public BufferStream(int capacity, bool expandable, bool isLittleEndian)
{
ThrowHelper.ArgumentMustPositive((capacity < 0), nameof(capacity));
this._buffer = capacity != 0 ? new byte[capacity] : Array.Empty <byte>();
this._writable = true;
this._expandable = expandable;
this._start = 0;
this._end = 0;
this._isLittleEndian = isLittleEndian;
this._isOpen = true;
}