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ReliabilityLayer.go
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/
ReliabilityLayer.go
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package peer
import "io"
import "errors"
const (
// Unreliable is the RakNet UNRELIABLE reliability
Unreliable = iota
// UnreliableSequenced is the RakNet UNRELIABLE_SEQUENCED reliability
UnreliableSequenced
// Reliable is the RakNet RELIABLE reliability
Reliable
// ReliableOrdered is the RakNet RELIABLE_ORDERED reliability
ReliableOrdered
// ReliableSequenced is the RakNet RELIABLE_SEQUENCED reliability
ReliableSequenced
)
// ReliablePacket describes a packet within a ReliabilityLayer
type ReliablePacket struct {
// Reliability ID: (un)reliable? ordered? sequenced?
Reliability uint8
HasSplitPacket bool
// Length of this split in bits
LengthInBits uint16
// Unique ID given to each packet. Splits of the same packet have a different ID.
ReliableMessageNumber uint32
// Unchannelled sequencing index
SequencingIndex uint32
// Channelled ordering index
OrderingIndex uint32
OrderingChannel uint8
// Count of splits this packet has
SplitPacketCount uint32
// Splits of the same packet have the same SplitPacketID
SplitPacketID uint16
// 0 <= SplitPacketIndex < SplitPacketCount
SplitPacketIndex uint32
// The RakNet layer containing this packet
RakNetLayer *RakNetLayer
// Data contained by this split
SelfData []byte
SplitBuffer *SplitPacketBuffer
}
// ReliabilityLayer describes a RakNet connection packet container
type ReliabilityLayer struct {
Packets []*ReliablePacket
}
// GetLog returns the accumulated log for the packet
func (packet *ReliablePacket) GetLog() string {
if packet.SplitBuffer.logBuffer == nil {
return ""
}
return packet.SplitBuffer.logBuffer.String()
}
// IsReliable returns a bool describing whether the packet's reliability is considered "Reliable"
func (packet *ReliablePacket) IsReliable() bool {
return packet.Reliability == Reliable || packet.Reliability == ReliableSequenced || packet.Reliability == ReliableOrdered
}
// IsSequenced returns a bool descibing whether the packet's reliability is considered "Sequenced"
func (packet *ReliablePacket) IsSequenced() bool {
return packet.Reliability == UnreliableSequenced || packet.Reliability == ReliableSequenced
}
// IsOrdered returns a bool descibing whether the packet's reliability is considered "Ordered"
func (packet *ReliablePacket) IsOrdered() bool {
return packet.Reliability == UnreliableSequenced || packet.Reliability == ReliableSequenced || packet.Reliability == ReliableOrdered
}
func (thisStream *extendedReader) DecodeReliabilityLayer(reader PacketReader, layers *PacketLayers) (*ReliabilityLayer, error) {
layer := &ReliabilityLayer{}
var reliability uint8
var hasSplitPacket bool
var err error
for reliability, hasSplitPacket, err = thisStream.readReliabilityFlags(); err == nil; reliability, hasSplitPacket, err = thisStream.readReliabilityFlags() {
reliablePacket := &ReliablePacket{}
reliablePacket.RakNetLayer = layers.RakNet
reliablePacket.Reliability = reliability
reliablePacket.HasSplitPacket = hasSplitPacket
reliablePacket.LengthInBits, err = thisStream.readUint16BE()
if err != nil {
return layer, err
}
if reliablePacket.LengthInBits < 8 {
return layer, errors.New("invalid length of 0")
}
if reliablePacket.IsReliable() {
reliablePacket.ReliableMessageNumber, err = thisStream.readUint24LE()
if err != nil {
return layer, err
}
}
if reliablePacket.IsSequenced() {
reliablePacket.SequencingIndex, err = thisStream.readUint24LE()
if err != nil {
return layer, err
}
}
if reliablePacket.IsOrdered() {
reliablePacket.OrderingIndex, err = thisStream.readUint24LE()
if err != nil {
return layer, err
}
reliablePacket.OrderingChannel, err = thisStream.readUint8()
if err != nil {
return layer, err
}
}
if reliablePacket.HasSplitPacket {
reliablePacket.SplitPacketCount, err = thisStream.readUint32BE()
if err != nil {
return layer, err
}
reliablePacket.SplitPacketID, err = thisStream.readUint16BE()
if err != nil {
return layer, err
}
reliablePacket.SplitPacketIndex, err = thisStream.readUint32BE()
if err != nil {
return layer, err
}
}
reliablePacket.SelfData, err = thisStream.readString(int((reliablePacket.LengthInBits + 7) / 8))
if err != nil {
return layer, err
}
if !reliablePacket.HasSplitPacket {
reliablePacket.SplitPacketCount = 1
}
layer.Packets = append(layer.Packets, reliablePacket)
}
if err != io.EOF {
return layer, err
}
return layer, nil
}
// Serialize serializes the packet to its network format
func (layer *ReliabilityLayer) Serialize(writer PacketWriter, outputStream *extendedWriter) error {
var err error
for _, packet := range layer.Packets {
reliability := packet.Reliability
err = outputStream.writeReliabilityFlags(reliability, packet.HasSplitPacket)
if err != nil {
return err
}
packet.LengthInBits = uint16(len(packet.SelfData) * 8)
err = outputStream.writeUint16BE(packet.LengthInBits)
if err != nil {
return err
}
if reliability >= 2 && reliability <= 4 {
err = outputStream.writeUint24LE(packet.ReliableMessageNumber)
if err != nil {
return err
}
}
if reliability == 1 || reliability == 4 {
err = outputStream.writeUint24LE(packet.SequencingIndex)
if err != nil {
return err
}
}
if reliability == 1 || reliability == 4 || reliability == 3 || reliability == 7 {
err = outputStream.writeUint24LE(packet.OrderingIndex)
if err != nil {
return err
}
err = outputStream.WriteByte(byte(packet.OrderingChannel))
if err != nil {
return err
}
}
if packet.HasSplitPacket {
err = outputStream.writeUint32BE(packet.SplitPacketCount)
if err != nil {
return err
}
err = outputStream.writeUint16BE(packet.SplitPacketID)
if err != nil {
return err
}
err = outputStream.writeUint32BE(packet.SplitPacketIndex)
if err != nil {
return err
}
}
err = outputStream.allBytes(packet.SelfData)
if err != nil {
return err
}
}
return nil
}
// Copy creates a safe copy of a ReliablePacket.
// It doesn't retain the data or its length.
func (packet *ReliablePacket) Copy() *ReliablePacket {
newPacket := new(ReliablePacket)
newPacket.Reliability = packet.Reliability
newPacket.HasSplitPacket = packet.HasSplitPacket
newPacket.OrderingChannel = packet.OrderingChannel
newPacket.OrderingIndex = packet.OrderingIndex
newPacket.ReliableMessageNumber = packet.ReliableMessageNumber
newPacket.SequencingIndex = packet.SequencingIndex
newPacket.SplitPacketCount = packet.SplitPacketCount
newPacket.SplitPacketID = packet.SplitPacketID
newPacket.SplitPacketIndex = packet.SplitPacketIndex
newPacket.SplitBuffer = packet.SplitBuffer
return newPacket
}