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Packet83_03.go
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Packet83_03.go
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package peer
import (
"errors"
"fmt"
"github.com/Gskartwii/roblox-dissector/datamodel"
"github.com/robloxapi/rbxfile"
)
// Packet83_03 represents ID_CHANGE_PROPERTY
type Packet83_03 struct {
// Instance that had the property change
Instance *datamodel.Instance
HasVersion bool
Version int32
Schema *NetworkPropertySchema
// New value
Value rbxfile.Value
}
func (thisStream *extendedReader) DecodePacket83_03(reader PacketReader, layers *PacketLayers) (Packet83Subpacket, error) {
var err error
layer := &Packet83_03{}
reference, err := thisStream.ReadObject(reader)
if err != nil {
return layer, err
}
if reference.IsNull {
return layer, errors.New("self is null in repl property")
}
layer.Instance, err = reader.Context().InstancesByReference.TryGetInstance(reference)
if err != nil {
return layer, err
}
propertyIDx, err := thisStream.readUint16BE()
if err != nil {
return layer, err
}
layer.HasVersion, err = thisStream.readBoolByte()
if err != nil {
return layer, err
}
// If this packet was written by the client, read version
if layer.HasVersion && reader.IsClient() {
layer.Version, err = thisStream.readSintUTF8()
if err != nil {
return layer, err
}
}
context := reader.Context()
if int(propertyIDx) == int(len(context.NetworkSchema.Properties)) { // explicit Parent property system
var reference datamodel.Reference
reference, err = thisStream.ReadObject(reader)
if err != nil {
return layer, err
}
result := datamodel.ValueReference{Reference: reference}
layer.Value = result
layer.Schema = nil
// CreateInstance: allow forward references in ID_REPLIC_PROP
// TODO: too tolerant?
refInstance, err := context.InstancesByReference.CreateInstance(reference)
if err != nil {
return layer, err
}
result.Instance = refInstance
return layer, err
}
if int(propertyIDx) > int(len(context.NetworkSchema.Properties)) {
return layer, fmt.Errorf("prop idx %d is higher than %d", propertyIDx, len(context.NetworkSchema.Properties))
}
schema := context.NetworkSchema.Properties[propertyIDx]
layer.Schema = schema
deferred := newDeferredStrings(reader)
layer.Value, err = schema.Decode(reader, thisStream, layers, deferred)
if err != nil {
return layer, err
}
err = thisStream.resolveDeferredStrings(deferred)
if err != nil {
return layer, err
}
return layer, nil
}
// Serialize implements Packet83Subpacke.Serialize()
func (layer *Packet83_03) Serialize(writer PacketWriter, stream *extendedWriter) error {
if layer.Instance == nil {
return errors.New("self is nil in serialize repl prop")
}
err := stream.WriteObject(layer.Instance, writer)
if err != nil {
return err
}
context := writer.Context()
if layer.Schema == nil { // assume Parent property
err = stream.writeUint16BE(uint16(len(context.NetworkSchema.Properties)))
if err != nil {
return err
}
err = stream.writeBoolByte(layer.HasVersion)
if err != nil {
return err
}
// If this packet is to the server, write version
if layer.HasVersion && !writer.ToClient() {
err = stream.writeSintUTF8(layer.Version)
if err != nil {
return err
}
}
return stream.WriteObject(layer.Value.(datamodel.ValueReference).Instance, writer)
}
err = stream.writeUint16BE(layer.Schema.NetworkID)
if err != nil {
return err
}
err = stream.writeBoolByte(layer.HasVersion)
if err != nil {
return err
}
if layer.HasVersion && !writer.ToClient() {
err = stream.writeSintUTF8(layer.Version)
if err != nil {
return err
}
}
// TODO: A different system for this?
deferred := newWriteDeferredStrings(writer)
err = layer.Schema.Serialize(layer.Value, writer, stream, deferred)
if err != nil {
return err
}
return stream.resolveDeferredStrings(deferred)
}
// Type implements Packet83Subpacket.Type()
func (Packet83_03) Type() uint8 {
return 3
}
// TypeString implements Packet83Subpacket.TypeString()
func (Packet83_03) TypeString() string {
return "ID_REPLIC_PROP"
}
func (layer *Packet83_03) String() string {
var propName string
if layer.Schema == nil {
propName = "Parent"
} else {
propName = layer.Schema.Name
}
return fmt.Sprintf("ID_REPLIC_PROP: %s[%s]", layer.Instance.GetFullName(), propName)
}