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Packet90Layer.go
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Packet90Layer.go
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package peer
import (
"fmt"
"regexp"
"strconv"
)
// Packet90VersionID represents a ID_PROTOCOL_SYNC version id
type Packet90VersionID [5]int32
// Packet90Layer represents ID_PROTOCOL_SYNC - client -> server
type Packet90Layer struct {
SchemaVersion uint32
Int1 uint8
Int2 uint8
RequestedFlags []string
JoinData string
VersionID Packet90VersionID
}
func (stream *extendedReader) DecodePacket90Layer(reader PacketReader, layers *PacketLayers) (RakNetPacket, error) {
layer := &Packet90Layer{}
lenBytes := bitsToBytes(uint(layers.Reliability.LengthInBits)) - 1 // -1 for packet id
thisStream, err := stream.aesDecrypt(int(lenBytes), packet90AESKey)
if err != nil {
return layer, err
}
layer.Int2, err = thisStream.ReadByte()
if err != nil {
return layer, err
}
layer.SchemaVersion, err = thisStream.readUint32BE()
if err != nil {
return layer, err
}
layer.Int1, err = thisStream.ReadByte()
if err != nil {
return layer, err
}
flagsLen, err := thisStream.readUint16BE()
if err != nil {
return layer, err
}
layer.RequestedFlags = make([]string, flagsLen)
for i := 0; i < int(flagsLen); i++ {
layer.RequestedFlags[i], err = thisStream.readVarLengthString()
if err != nil {
return layer, err
}
}
layer.JoinData, err = thisStream.readVarLengthString()
if err != nil {
return layer, err
}
placeIDRegex := regexp.MustCompile(`placeId=(\d+)`)
placeID, _ := strconv.Atoi(placeIDRegex.FindStringSubmatch(layer.JoinData)[1])
reader.Context().PlaceID = int64(placeID)
id, err := thisStream.readUint32BE()
layer.VersionID[0] = int32(id)
if err != nil {
return layer, err
}
if layer.VersionID[0]&0xC == 0 {
_, err = thisStream.readUint32BE()
if err != nil {
return layer, err
}
}
id, err = thisStream.readUint32BE()
layer.VersionID[1] = int32(id)
if err != nil {
return layer, err
}
if layer.VersionID[0]&0x50 == 0 {
_, err = thisStream.readUint32BE()
if err != nil {
return layer, err
}
}
id, err = thisStream.readUint32BE()
layer.VersionID[2] = int32(id)
if err != nil {
return layer, err
}
if layer.VersionID[0]&0xA0 == 0 {
_, err = thisStream.readUint32BE()
if err != nil {
return layer, err
}
}
id, err = thisStream.readUint32BE()
layer.VersionID[3] = int32(id)
if err != nil {
return layer, err
}
if layer.VersionID[0]&0x900 == 0 {
_, err = thisStream.readUint32BE()
if err != nil {
return layer, err
}
}
id, err = thisStream.readUint32BE()
layer.VersionID[4] = int32(id)
if err != nil {
return layer, err
}
reader.Context().VersionID = layer.VersionID
return layer, nil
}
// Serialize implements RakNetPacket.Serialize
func (layer *Packet90Layer) Serialize(writer PacketWriter, stream *extendedWriter) error {
var err error
rawStream := stream.aesEncrypt(packet90AESKey)
err = rawStream.WriteByte(layer.Int2)
if err != nil {
return err
}
err = rawStream.writeUint32BE(layer.SchemaVersion)
if err != nil {
return err
}
err = rawStream.WriteByte(layer.Int1)
if err != nil {
return err
}
err = rawStream.writeUint16BE(uint16(len(layer.RequestedFlags)))
if err != nil {
return err
}
for i := 0; i < len(layer.RequestedFlags); i++ {
err = rawStream.writeVarLengthString(layer.RequestedFlags[i])
if err != nil {
return err
}
}
err = rawStream.writeVarLengthString(layer.JoinData)
if err != nil {
return err
}
err = rawStream.writeUint32BE(uint32(layer.VersionID[0]))
if err != nil {
return err
}
if layer.VersionID[0]&0xC == 0 {
err = rawStream.writeUint32BE(uint32(layer.VersionID[0]))
if err != nil {
return err
}
}
err = rawStream.writeUint32BE(uint32(layer.VersionID[1]))
if err != nil {
return err
}
if layer.VersionID[0]&0x50 == 0 {
err = rawStream.writeUint32BE(uint32(layer.VersionID[0]))
if err != nil {
return err
}
}
err = rawStream.writeUint32BE(uint32(layer.VersionID[2]))
if err != nil {
return err
}
if layer.VersionID[0]&0xA0 == 0 {
err = rawStream.writeUint32BE(uint32(layer.VersionID[0]))
if err != nil {
return err
}
}
err = rawStream.writeUint32BE(uint32(layer.VersionID[3]))
if err != nil {
return err
}
if layer.VersionID[0]&0x900 == 0 {
err = rawStream.writeUint32BE(uint32(layer.VersionID[0]))
if err != nil {
return err
}
}
err = rawStream.writeUint32BE(uint32(layer.VersionID[4]))
if err != nil {
return err
}
err = rawStream.Close()
if err != nil {
return err
}
return nil
}
func (layer *Packet90Layer) String() string {
return fmt.Sprintf("ID_PROTOCOL_SYNC: Version %d, %d flags", layer.SchemaVersion, len(layer.RequestedFlags))
}
// TypeString implements RakNetPacket.TypeString()
func (Packet90Layer) TypeString() string {
return "ID_PROTOCOL_SYNC"
}
// Type implements RakNetPacket.Type()
func (Packet90Layer) Type() byte {
return 0x90
}