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117 lines
2.7 KiB
Go
117 lines
2.7 KiB
Go
package protocol
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import (
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"bytes"
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"github.com/golang/protobuf/proto"
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"encoding/binary"
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"fmt"
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. "github.com/Philipp15b/go-steam/protocol/steamlang"
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)
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// TODO: Headers are always deserialized twice.
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// Represents an incoming, partially unread message.
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type Packet struct {
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EMsg EMsg
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IsProto bool
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TargetJobId JobId
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SourceJobId JobId
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Data []byte
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}
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func NewPacket(data []byte) (*Packet, error) {
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var rawEMsg uint32
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err := binary.Read(bytes.NewReader(data), binary.LittleEndian, &rawEMsg)
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if err != nil {
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return nil, err
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}
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eMsg := NewEMsg(rawEMsg)
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buf := bytes.NewReader(data)
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if eMsg == EMsg_ChannelEncryptRequest || eMsg == EMsg_ChannelEncryptResult {
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header := NewMsgHdr()
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header.Msg = eMsg
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err = header.Deserialize(buf)
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if err != nil {
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return nil, err
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}
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return &Packet{
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EMsg: eMsg,
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IsProto: false,
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TargetJobId: JobId(header.TargetJobID),
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SourceJobId: JobId(header.SourceJobID),
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Data: data,
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}, nil
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} else if IsProto(rawEMsg) {
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header := NewMsgHdrProtoBuf()
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header.Msg = eMsg
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err = header.Deserialize(buf)
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if err != nil {
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return nil, err
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}
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return &Packet{
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EMsg: eMsg,
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IsProto: true,
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TargetJobId: JobId(header.Proto.GetJobidTarget()),
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SourceJobId: JobId(header.Proto.GetJobidSource()),
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Data: data,
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}, nil
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} else {
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header := NewExtendedClientMsgHdr()
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header.Msg = eMsg
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err = header.Deserialize(buf)
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if err != nil {
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return nil, err
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}
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return &Packet{
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EMsg: eMsg,
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IsProto: false,
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TargetJobId: JobId(header.TargetJobID),
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SourceJobId: JobId(header.SourceJobID),
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Data: data,
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}, nil
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}
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}
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func (p *Packet) String() string {
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return fmt.Sprintf("Packet{EMsg = %v, Proto = %v, Len = %v, TargetJobId = %v, SourceJobId = %v}", p.EMsg, p.IsProto, len(p.Data), p.TargetJobId, p.SourceJobId)
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}
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func (p *Packet) ReadProtoMsg(body proto.Message) *ClientMsgProtobuf {
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header := NewMsgHdrProtoBuf()
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buf := bytes.NewBuffer(p.Data)
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header.Deserialize(buf)
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proto.Unmarshal(buf.Bytes(), body)
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return &ClientMsgProtobuf{ // protobuf messages have no payload
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Header: header,
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Body: body,
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}
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}
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func (p *Packet) ReadClientMsg(body MessageBody) *ClientMsg {
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header := NewExtendedClientMsgHdr()
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buf := bytes.NewReader(p.Data)
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header.Deserialize(buf)
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body.Deserialize(buf)
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payload := make([]byte, buf.Len())
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buf.Read(payload)
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return &ClientMsg{
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Header: header,
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Body: body,
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Payload: payload,
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}
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}
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func (p *Packet) ReadMsg(body MessageBody) *Msg {
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header := NewMsgHdr()
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buf := bytes.NewReader(p.Data)
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header.Deserialize(buf)
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body.Deserialize(buf)
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payload := make([]byte, buf.Len())
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buf.Read(payload)
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return &Msg{
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Header: header,
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Body: body,
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Payload: payload,
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}
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}
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