protected IEnumerable <HexSpan> GetValidSpans(HexBuffer buffer, HexPosition start, HexPosition upperBounds)
{
var pos = start;
bool fullSpan = true;
while (pos < HexPosition.MaxEndPosition)
{
var span = buffer.GetNextValidSpan(pos, upperBounds, fullSpan);
if (span == null)
{
break;
}
var newStart = HexPosition.Max(pos, span.Value.Start);
var newEnd = HexPosition.Min(upperBounds, span.Value.End);
if (newStart < newEnd)
{
yield return(HexSpan.FromBounds(newStart, newEnd));
}
pos = span.Value.End;
fullSpan = false;
}
}