// Return if there is more to come.
public static bool ProcessLanesSend(LaneSetup setup, Lane[] lanes, DateTime now, Send[] output, out uint numOut)
{
numOut = 0;
for (int i = 0; i < lanes.Length; i++)
{
Lane lane = lanes[i];
int holes = 0;
for (int j = 0; j < lane.OutCount; j++)
{
if (lane.Out[j].Source == null)
{
holes++;
continue;
}
if (lane.Out[j].SendTime <= now)
{
lane.Stats.SendCount++;
lane.Out[j].SendCount++;
if (lane.Out[j].SendCount > 1)
{
lane.Stats.SendResends++;
}
uint resendMsAdd = lane.Out[j].SendCount * lane.Out[j].SendCount * lane.ResendMs;
if (resendMsAdd > 5000)
{
resendMsAdd = 5000;
}
lane.Out[j].SendTime = lane.Out[j].SendTime.AddMilliseconds(resendMsAdd);
Bitstream.Buffer tmp = setup.Factory.GetBuffer(setup.MaxPacketSize);
tmp.bytepos = setup.ReservedHeaderBytes;
Bitstream.PutBits(tmp, 1, lane.Out[j].Reliable ? 1u : 0u);
Bitstream.PutCompressedUint(tmp, lane.Out[j].SeqId);
if (lane.Out[j].Reliable)
{
Bitstream.PutBits(tmp, 1, lane.Out[j].IsFinalPiece ? 1u : 0u);
// flush out a max number of acks or all.
int wrote = 0;
for (int k = 0; k < lane.AckCount && k < 4; k++)
{
Bitstream.PutCompressedUint(tmp, lane.Acks[k]);
wrote++;
}
Bitstream.PutCompressedUint(tmp, 0);
for (int k = 0; k < (int)lane.AckCount - wrote; k++)
{
lane.Acks[k] = lane.Acks[k + wrote];
}
lane.AckCount = (ushort)(lane.AckCount - wrote);
}
Bitstream.SyncByte(tmp);
uint begin = lane.Out[j].Begin;
uint end = lane.Out[j].End;
uint ofs = tmp.bytepos;
byte[] src = lane.Out[j].Source.buf;
byte[] dst = tmp.buf;
for (uint k = begin; k != end; k++)
{
dst[ofs++] = src[k];
}
tmp.bytepos = 0;
tmp.bitpos = 0;
tmp.bytesize = ofs;
tmp.bitsize = 0;
output[numOut].Data = tmp;
output[numOut].Lane = lane;
lane.Stats.SendBytes += ofs;
if (++numOut == output.Length)
{
return(true);
}
}
}
if (holes > 0 && holes >= lane.OutCount / 4)
{
ushort write = 0;
for (uint j = 0; j < lane.OutCount; j++)
{
if (lane.Out[j].Source != null)
{
if (write != j)
{
lane.Out[write] = lane.Out[j];
}
++write;
}
}
lane.OutCount = write;
}
}
// Unsent acks
for (int i = 0; i < lanes.Length; i++)
{
Lane lane = lanes[i];
if (lane.AckCount > 0)
{
Bitstream.Buffer tmp = setup.Factory.GetBuffer(setup.MaxPacketSize);
tmp.bytepos = setup.ReservedHeaderBytes;
Bitstream.PutBits(tmp, 1, 1); // reliable
Bitstream.PutCompressedUint(tmp, 0); // ack only
Bitstream.PutBits(tmp, 1, 1); // final
for (int k = 0; k < lane.AckCount; k++)
{
Bitstream.PutCompressedUint(tmp, lane.Acks[k]);
}
Bitstream.PutCompressedUint(tmp, 0);
lane.AckCount = 0;
Bitstream.SyncByte(tmp);
tmp.Flip();
output[numOut].Data = tmp;
output[numOut].Lane = lane;
lane.Stats.SendCount++;
lane.Stats.SendAckOnly++;
lane.Stats.SendBytes += tmp.bytesize;
if (++numOut == output.Length)
{
return(true);
}
}
}
return(false);
}
// Will hold the buffers until they are sent
public static void ScheduleSend(LaneSetup setup, DateTime now, ToSend[] tosend, uint count)
{
for (uint i = 0; i < count; i++)
{
Lane lane = tosend[i].Lane;
if (!tosend[i].Reliable)
{
uint target = (uint)lane.Out.Length;
if (lane.OutCount == lane.Out.Length)
{
for (uint k = 0; k < lane.Out.Length; k++)
{
if (lane.Out[k].Source == null)
{
target = k;
break;
}
}
}
else
{
target = lane.OutCount++;
}
if (target == lane.Out.Length)
{
// Dropped
continue;
}
if (tosend[i].CanKeepData)
{
lane.Out[target].Source = tosend[i].Data;
}
else
{
lane.Out[target].Source = setup.Factory.GetBuffer(tosend[i].Data.bytesize);
Bitstream.Insert(lane.Out[target].Source, tosend[i].Data);
Bitstream.SyncByte(lane.Out[target].Source);
lane.Out[target].Source.Flip();
}
lane.Out[target].Source.userdata = 1; // refcount
lane.Out[target].Begin = 0;
lane.Out[target].End = tosend[i].Data.bytesize;
lane.Out[target].IsFinalPiece = true;
lane.Out[target].SendTime = now;
lane.Out[target].InitialSendTime = now;
lane.Out[target].SendCount = 0;
lane.Out[target].SeqId = ++lane.OutgoingSeqUnreliable;
lane.Out[target].Reliable = false;
}
else
{
uint segmentSize = setup.MaxPacketSize - 32 - setup.ReservedHeaderBytes;
uint numSegments = (uint)(((tosend[i].Data.bytesize - tosend[i].Data.bytepos) + segmentSize - 1) / segmentSize);
uint[] outSlots = new uint[256];
if (numSegments == 0 || numSegments > outSlots.Length)
{
continue;
}
uint write = 0;
for (uint k = 0; k < lane.OutCount; k++)
{
if (lane.Out[k].Source == null)
{
outSlots[write++] = k;
if (write == numSegments)
{
break;
}
}
}
uint left = numSegments - write;
if ((lane.Out.Length - lane.OutCount) < left)
{
// no room.
continue;
}
for (uint k = 0; k < left; k++)
{
outSlots[write++] = lane.OutCount++;
}
Bitstream.Buffer source = tosend[i].Data;
if (!tosend[i].CanKeepData)
{
source = setup.Factory.GetBuffer(tosend[i].Data.bytesize);
Bitstream.Insert(source, tosend[i].Data);
source.Flip();
}
source.userdata = 0;
uint RangeBegin = 0;
for (uint k = 0; k < numSegments; k++)
{
uint bytesLeft = source.bytesize - RangeBegin;
if (bytesLeft == 0)
{
Console.WriteLine("ERROR: bytesLeft=0!");
continue;
}
uint toWrite = bytesLeft < segmentSize ? bytesLeft : segmentSize;
uint slot = outSlots[k];
source.userdata++;
lane.Out[slot].Source = source;
lane.Out[slot].Begin = RangeBegin;
lane.Out[slot].End = RangeBegin + toWrite;
lane.Out[slot].IsFinalPiece = k == (numSegments - 1);
lane.Out[slot].SendTime = now;
lane.Out[slot].InitialSendTime = now;
lane.Out[slot].SendCount = 0;
lane.Out[slot].Reliable = true;
lane.Out[slot].SeqId = ++lane.OutgoingSeqReliable;
RangeBegin = RangeBegin + toWrite;
}
}
}
}
// This will start reading from the buffers and modify the incoming array.
public static void HandleIncomingPackets(LaneSetup setup, Incoming[] packets, uint packetsCount)
{
// Zero pass make own buffers.
for (uint i = 0; i < packetsCount; i++)
{
if (!packets[i].CanKeepData)
{
Bitstream.Buffer tmp = packets[i].Packet;
Bitstream.Buffer copy = setup.Factory.GetBuffer((uint)tmp.buf.Length);
Bitstream.Insert(copy, tmp);
copy.Flip();
packets[i].Packet = copy;
}
}
// First pass extract.
for (uint i = 0; i < packetsCount; i++)
{
Bitstream.Buffer tmp = packets[i].Packet;
Lane lane = packets[i].Lane;
lane.Stats.RecvCount++;
lane.Stats.RecvBytes += tmp.BitsLeft() / 8;
bool reliable = Bitstream.ReadBits(tmp, 1) == 1;
uint seq = Bitstream.ReadCompressedUint(tmp);
packets[i].Internal.Seq = seq;
packets[i].Internal.IsReliable = reliable;
if (seq == 0)
{
lane.Stats.RecvAckOnly++;
}
if (reliable)
{
packets[i].Internal.IsFinalPiece = Bitstream.ReadBits(tmp, 1) == 1;
if (!packets[i].Internal.IsFinalPiece)
{
lane.Stats.RecvNonFinal++;
}
if (seq != 0)
{
if (lane.AckCount < lane.Acks.Length)
{
lane.Acks[lane.AckCount++] = seq;
}
}
while (true)
{
uint seqAck = Bitstream.ReadCompressedUint(tmp);
if (seqAck != 0)
{
for (int j = 0; j != lane.OutCount; j++)
{
if (lane.Out[j].SeqId == seqAck)
{
double msLag = (packets[i].ArrivalTime - lane.Out[j].InitialSendTime).TotalMilliseconds;
if (msLag > 0)
{
uint ms = (uint)msLag;
if (ms < lane.LagMsMin || lane.LagMsMin == 0)
{
if (ms >= setup.MinResendTimeMs)
{
lane.LagMsMin = ms;
lane.ResendMs = 2 * ms;
}
}
}
if (lane.Out[j].Source != null)
{
if (--lane.Out[j].Source.userdata == 0)
{
setup.Factory.ReturnBuffer(lane.Out[j].Source);
}
lane.Out[j].Source = null;
}
}
}
continue;
}
break;
}
}
else
{
packets[i].Internal.IsFinalPiece = true;
}
Bitstream.SyncByte(tmp);
}
// Unreliable packets, these are placed in the out queue after reading out the sequence and mode.
for (int i = 0; i < packets.Length; i++)
{
if (packets[i].Internal.IsReliable || packets[i].Internal.Seq == 0)
{
continue;
}
Lane lane = packets[i].Lane;
if (lane.DoneHead - lane.DoneTail != lane.Done.Length)
{
uint head = lane.DoneHead % (uint)lane.Done.Length;
lane.Done[head].Data = packets[i].Packet;
lane.Done[head].Reliable = false;
lane.Done[head].SeqId = packets[i].Internal.Seq;
lane.Done[head].ArrivalTime = packets[i].ArrivalTime;
lane.Done[head].CompletionTime = packets[i].ArrivalTime;
lane.Done[head].Lane = lane;
lane.DoneHead = lane.DoneHead + 1;
}
}
// Handle reliable. These go straight
for (int i = 0; i < packets.Length; i++)
{
if (!packets[i].Internal.IsReliable || packets[i].Internal.Seq == 0)
{
continue;
}
Lane lane = packets[i].Lane;
if (packets[i].Internal.Seq <= lane.ReliableSeq)
{
lane.Stats.RecvDupes++;
continue;
}
// If packet arrives a second time, ignore.
uint numProgress = (uint)lane.Progress.Length;
bool hadit = false;
for (uint p = lane.ProgressTail; p != lane.ProgressHead; p++)
{
uint idx = p % numProgress;
if (lane.Progress[idx].SeqId == packets[i].Internal.Seq)
{
hadit = true;
break;
}
}
if (hadit)
{
// Already got the packet for this sequence id.
lane.Stats.RecvDupes++;
continue;
}
if (lane.ProgressHead - lane.ProgressTail != lane.Progress.Length)
{
uint head = lane.ProgressHead % (uint)lane.Progress.Length;
lane.Progress[head].Data = packets[i].Packet;
lane.Progress[head].IsFinalPiece = packets[i].Internal.IsFinalPiece;
lane.Progress[head].ArrivalTime = packets[i].ArrivalTime;
lane.Progress[head].SeqId = packets[i].Internal.Seq;
lane.ProgressHead = lane.ProgressHead + 1;
}
}
}
