serialize flags as unsigned 32 bit int

Author: Andrey Sidorov

lib/packets/handshake.js

@@ -20,14 +20,20 @@ Handshake.fromPacket = function (packet)
   args.connectionId = packet.readInt32();
   args.authPluginData1 = packet.readBuffer(8);
   packet.skip(1);
-  args.capabilityFlags = packet.readInt16();
+  var capabilityFlagsBuffer = Buffer.allocUnsafe(4);
+  capabilityFlagsBuffer[0] = packet.readInt8();
+  capabilityFlagsBuffer[1] = packet.readInt8();
   if (packet.haveMoreData()) {
     args.characterSet = packet.readInt8();
     args.statusFlags = packet.readInt16();
     // upper 2 bytes
-    args.capabilityFlags += packet.readInt16() << 16;
+    capabilityFlagsBuffer[2] = packet.readInt8();
+    capabilityFlagsBuffer[3] = packet.readInt8();
+    args.capabilityFlags = capabilityFlagsBuffer.readUInt32LE(0);
     args.authPluginDataLength = packet.readInt8();
     packet.skip(10);
+  } else {
+    args.capabilityFlags = capabilityFlagsBuffer.readUInt16LE(0);
   }
   // var len = Math.max(12, args.authPluginDataLength - 8);
   args.authPluginData2 = packet.readBuffer(12);
@@ -66,10 +72,12 @@ Handshake.prototype.toPacket = function (sequenceId) {
   packet.writeInt32(this.connectionId);
   packet.writeBuffer(this.authPluginData1);
   packet.writeInt8(0);
-  packet.writeInt16(this.capabilityFlags & 0xffff);
+  var capabilityFlagsBuffer = Buffer.allocUnsafe(4);
+  capabilityFlagsBuffer.writeUInt32LE(this.capabilityFlags);
+  packet.writeBuffer(capabilityFlagsBuffer.slice(0, 2));
   packet.writeInt8(this.characterSet);
   packet.writeInt16(this.statusFlags);
-  packet.writeInt16(this.capabilityFlags >> 16);
+  packet.writeBuffer(capabilityFlagsBuffer.slice(2, 4));
   packet.writeInt8(21); // authPluginDataLength
   packet.skip(10);
   packet.writeBuffer(this.authPluginData2);