add Packet class

ackhandler/interfaces.go

@@ -6,10 +6,10 @@ import (
 )
 
 type OutgoingPacketAckHandler interface {
-	SentPacket(packetNumber protocol.PacketNumber, entropyBit bool, plaintext []byte)
+	SentPacket(packet *Packet) error
 	ReceivedAck(ackFrame *frames.AckFrame)
 
-	DequeuePacketForRetransmission() (packetNumber protocol.PacketNumber, entropyBit bool, plaintext []byte)
+	DequeuePacketForRetransmission() (packet *Packet)
 }
 
 type IncomingPacketAckHandler interface {

ackhandler/packet.go

@@ -0,0 +1,12 @@
+package ackhandler
+
+import "github.com/lucas-clemente/quic-go/protocol"
+
+// A Packet is a packet
+type Packet struct {
+	PacketNumber protocol.PacketNumber
+	Plaintext    []byte
+	EntropyBit   bool
+
+	MissingReports uint8
+}