Add vendor (steam)

vendor/github.com/Philipp15b/go-steam/protocol/internal.go

@@ -0,0 +1,47 @@
+package protocol
+
+import (
+	"io"
+	"math"
+	"strconv"
+
+	. "github.com/Philipp15b/go-steam/protocol/steamlang"
+)
+
+type JobId uint64
+
+func (j JobId) String() string {
+	if j == math.MaxUint64 {
+		return "(none)"
+	}
+	return strconv.FormatUint(uint64(j), 10)
+}
+
+type Serializer interface {
+	Serialize(w io.Writer) error
+}
+
+type Deserializer interface {
+	Deserialize(r io.Reader) error
+}
+
+type Serializable interface {
+	Serializer
+	Deserializer
+}
+
+type MessageBody interface {
+	Serializable
+	GetEMsg() EMsg
+}
+
+// the default details to request in most situations
+const EClientPersonaStateFlag_DefaultInfoRequest = EClientPersonaStateFlag_PlayerName |
+	EClientPersonaStateFlag_Presence | EClientPersonaStateFlag_SourceID |
+	EClientPersonaStateFlag_GameExtraInfo
+
+const DefaultAvatar = "fef49e7fa7e1997310d705b2a6158ff8dc1cdfeb"
+
+func ValidAvatar(avatar string) bool {
+	return !(avatar == "0000000000000000000000000000000000000000" || len(avatar) != 40)
+}