/// <summary>
/// Used when sending a packet.
/// </summary>
internal void GetSLACKSlots(out SACKSlot slot1, out SACKSlot slot2, out SACKSlot slot3, out SACKSlot slot4)
{
slot1 = null;
slot2 = null;
slot3 = null;
slot4 = null;
lock (this)
{
if (_slots[0].StartPacketId < 0)
{
return;
}
//---- Useful when some ACKs are loosed
slot1 = _slots[0].Clone();
_slots[0].ACKsCount = 0;
Interlocked.Exchange(ref _acksCount, _acksCount - slot1.ACKsCount);
CheckACKCount();
//---- Add all the slots
for (int index = 1; index < _slots.Count; index++)
{
SACKSlot slot = _slots[index];
if (slot.ACKsCount > 0)
{
Interlocked.Exchange(ref _acksCount, _acksCount - slot.ACKsCount);
slot.ACKsCount = 0;
CheckACKCount();
if (slot2 == null)
{
slot2 = slot.Clone();
}
else if (slot3 == null)
{
slot3 = slot.Clone();
}
else if (slot4 == null)
{
slot4 = slot.Clone();
return;
}
}
}
}
}
/// <summary>
/// Used when "resending" or sending queued "ACKs"
/// </summary>
internal List <SACKSlot> PrepareACKList()
{
List <SACKSlot> list = new List <SACKSlot>();
lock (this)
{
//---- Add all the slots, except the first one
for (int index = 1; index < _slots.Count; index++)
{
SACKSlot slot = _slots[index];
if (slot.ACKsCount > 0)
{
slot.ACKsCount = 0;
list.Add(slot.Clone());
}
}
//---- Add the first slot
// Useful when some ACKs are loosed
if (_slots[0].StartPacketId > -1)
{
if (list.Count > 1 || _slots[0].ACKsCount > 0)
{
_slots[0].ACKsCount = 0;
list.Insert(0, _slots[0].Clone());
}
}
Interlocked.Exchange(ref _acksCount, 0);
}
CheckACKCount();
return(list);
}