Added version and re-ordered header... Breaking change

node/header.go

@@ -13,23 +13,25 @@ const (
 )
 
 type header struct {
+	Version  byte
 	StreamID byte
-	Counter  uint64 // Init with time.Now().Unix << 30 to ensure monotonic.
 	SourceIP byte
 	DestIP   byte
+	Counter  uint64 // Init with time.Now().Unix << 30 to ensure monotonic.
 }
 
 func (h *header) Parse(b []byte) {
-	h.StreamID = b[0]
-	h.Counter = *(*uint64)(unsafe.Pointer(&b[1]))
-	h.SourceIP = b[9]
-	h.DestIP = b[10]
+	h.Version = b[0]
+	h.StreamID = b[1]
+	h.SourceIP = b[2]
+	h.DestIP = b[3]
+	h.Counter = *(*uint64)(unsafe.Pointer(&b[4]))
 }
 
 func (h *header) Marshal(buf []byte) {
-	buf[0] = h.StreamID
-	*(*uint64)(unsafe.Pointer(&buf[1])) = h.Counter
-	buf[9] = h.SourceIP
-	buf[10] = h.DestIP
-	buf[11] = 0
+	buf[0] = h.Version
+	buf[1] = h.StreamID
+	buf[2] = h.SourceIP
+	buf[3] = h.DestIP
+	*(*uint64)(unsafe.Pointer(&buf[4])) = h.Counter
 }