public IDisposable EnterElement(ElementInfo elemInfo) {
var disposable = new PreviousState {
NextElementPos = nextElementPos,
LastElementPos = lastElementPos
};
disposable.Disposed += (s, e) => {
var d = (PreviousState)s;
if(nextElementPos < d.LastElementPos) nextElementPos = d.NextElementPos;
lastElementPos = d.LastElementPos;
};
nextElementPos = elemInfo.DataPos;
lastElementPos = elemInfo.DataLength.HasValue ? elemInfo.DataPos + elemInfo.DataLength.Value : ~VIntConsts.UNKNOWN_LENGTH;
return disposable;
}
