Original skeleton changes.

lib/client.js

@@ -29,6 +29,7 @@ Client.prototype.setSocket = function(socket) {
     while (true) {
       parsed = parsePacket(incomingBuffer, self.isServer);
       if (! parsed) break;
+      if (typeof parsed.error !== "undefined") end(parsed.error);
       packet = parsed.results;
       incomingBuffer = incomingBuffer.slice(parsed.size);
       self.emit(packet.id, packet);

lib/protocol.js

@@ -1163,7 +1163,9 @@ LongWriter.prototype.write = function(buffer, offset) {
 
 function get(packetId, toServer) {
   var packetInfo = packets[packetId];
-  assert.ok(packetInfo, "unrecognized packet id: " + packetId);
+  if (!packetInfo) {
+    return null;
+  }
   return Array.isArray(packetInfo) ?
     packetInfo :
     toServer ?
@@ -1175,6 +1177,7 @@ function createPacketBuffer(packetId, params, isServer) {
   var size = 1;
   var fields = [ new UByteWriter(packetId) ];
   var packet = get(packetId, !isServer);
+  assert.notEqual(packet, null);
   packet.forEach(function(fieldInfo) {
     var value = params[fieldInfo.name];
     var Writer = types[fieldInfo.type][1];
@@ -1198,14 +1201,28 @@ function parsePacket(buffer, isServer) {
   var size = 1;
   var results = { id: packetId };
   var packetInfo = get(packetId, isServer);
-  assert.ok(packetInfo, "Unrecognized packetId: " + packetId);
+  if (packetInfo == null) {
+    return {
+      error: "Unrecognized packetId: " + packetId
+    }
+  }
   var i, fieldInfo, read, readResults;
   for (i = 0; i < packetInfo.length; ++i) {
     fieldInfo = packetInfo[i];
     read = types[fieldInfo.type][0];
-    assert.ok(read, "missing reader for data type: " + fieldInfo.type);
+    if (!read) {
+      return {
+        error: "missing reader for data type: " + fieldInfo.type;
+      }
+    }
     readResults = read(buffer, size);
     if (readResults) {
+      // if readResults.error is undef, error stays undef'd
+      if (typeof readResults.error !== "undefined") {
+        return {
+          error: readResults.error
+        }
+      }
       results[fieldInfo.name] = readResults.value;
       size += readResults.size;
     } else {