public void TrimRight(long newEnd)
{
CheckNotOpen();
if (!desirableRange.IsInRange(newEnd))
{
throw new ArgumentException("Position specified is out of this range", "position");
}
desirableRange = new FRange(desirableRange.Begin, newEnd, desirableRange.Priority);
if (newEnd <= LastReadPosition.GetValueOrDefault(long.MinValue))
{
PositionedLine pos = new PositionedLine();
foreach (PositionedLine p in ReverseIterator(newEnd))
{
pos = p;
break;
}
if (pos.Chunk != null)
{
pos.Chunk.TrimRight(pos.Position);
last = pos.Chunk;
last.next = null;
}
else
{
first = null;
last = null;
}
}
}
public void TrimLeft(long newBegin)
{
CheckNotOpen();
if (!desirableRange.IsInRange(newBegin))
{
throw new ArgumentException("Position specified is out of this range", "position");
}
desirableRange = new FRange(newBegin, desirableRange.End, desirableRange.Priority);
bool clearThisRange = false;
if (newBegin > LastReadPosition.GetValueOrDefault(long.MinValue))
{
clearThisRange = true;
}
else
{
PositionedLine pos = new PositionedLine();
foreach (PositionedLine p in ForwardIterator(newBegin))
{
pos = p;
break;
}
if (pos.Chunk != null)
{
pos.Chunk.TrimLeft(pos.Position);
first = pos.Chunk;
first.prev = null;
}
else
{
clearThisRange = true;
}
}
if (clearThisRange)
{
first = null;
last = null;
}
}
