tweak SocketPacket.PacketType

SwiftIO/SocketPacket.swift

@@ -43,11 +43,11 @@ class SocketPacket {
         case BINARY_EVENT = 5
         case BINARY_ACK = 6
         
-        init(str:String) {
-            if let int = str.toInt() {
-                self = PacketType(rawValue: int)!
+        init?(str:String) {
+            if let int = str.toInt(), let raw = PacketType(rawValue: int) {
+                self = raw
             } else {
-                self = PacketType(rawValue: 4)!
+                return nil
             }
         }
     }

SwiftIO/SocketParser.swift

@@ -185,7 +185,14 @@ class SocketParser {
             return nsp == "" && socket.nsp != "/"
         }
         
-        let p = parseString(stringMessage) as SocketPacket!
+        let p:SocketPacket
+        
+        if let pack = parseString(stringMessage) {
+            p = pack
+        } else {
+            socket.didError("Error parsing packet")
+            return
+        }
         
         if p.type == SocketPacket.PacketType.EVENT {
             if checkNSP(p.nsp) {