/// <exception cref="MalformedMessageException">Exception is thrown in case of invalid packet format</exception>
public static IByteBuffer encode(MQMessage header)
{
int length = header.GetLength();
IByteBuffer buf = GetBuffer(length);
MessageType type = header.MessageType;
switch (type)
{
case MessageType.CONNECT:
Connect connect = (Connect)header;
if (connect.Will != null && !connect.Will.IsValid())
{
throw new MalformedMessageException("invalid will encoding");
}
buf.SetByte(0, (byte)(((Int32)type) << 4));
buf.WriteShort(Connect.DEFAULT_PROTOCOL_LEVEL);
buf.WriteBytes(Encoding.UTF8.GetBytes(connect.Name));
buf.WriteByte(connect.ProtocolLevel);
byte contentFlags = 0;
if (connect.CleanSession)
{
contentFlags += 0x02;
}
if (connect.Will != null)
{
contentFlags += 0x04;
contentFlags += (byte)(((Int32)connect.Will.Topic.Qos) << 3);
if (connect.Will.Retain)
{
contentFlags += 0x20;
}
}
if (connect.Username != null)
{
contentFlags += 0x40;
}
if (connect.Password != null)
{
contentFlags += 0x80;
}
buf.WriteByte(contentFlags);
buf.WriteShort(connect.Keepalive);
buf.WriteShort(connect.ClientID.Length);
buf.WriteBytes(Encoding.UTF8.GetBytes(connect.ClientID));
if (connect.Will != null)
{
String willTopic = connect.Will.Topic.Name;
if (willTopic != null)
{
buf.WriteShort(willTopic.Length);
buf.WriteBytes(Encoding.UTF8.GetBytes(willTopic));
}
byte[] willMessage = connect.Will.Content;
if (willMessage != null)
{
buf.WriteShort(willMessage.Length);
buf.WriteBytes(willMessage);
}
}
String username = connect.Username;
if (username != null)
{
buf.WriteShort(username.Length);
buf.WriteBytes(Encoding.UTF8.GetBytes(username));
}
String password = connect.Password;
if (password != null)
{
buf.WriteShort(password.Length);
buf.WriteBytes(Encoding.UTF8.GetBytes(password));
}
break;
case MessageType.CONNACK:
Connack connack = (Connack)header;
buf.SetByte(0, (byte)(((Int32)type) << 4));
buf.WriteBoolean(connack.SessionPresent);
buf.WriteByte((Int32)connack.ReturnCode);
break;
case MessageType.PUBLISH:
Publish publish = (Publish)header;
byte firstByte = (byte)(((Int32)type) << 4);
if (publish.Dup)
{
firstByte += 0x08;
}
firstByte += (byte)(((Int32)publish.Topic.Qos) << 1);
if (publish.Retain)
{
firstByte += 0x01;
}
buf.SetByte(0, firstByte);
buf.WriteShort(publish.Topic.Name.Length);
buf.WriteBytes(Encoding.UTF8.GetBytes(publish.Topic.Name));
if (publish.PacketID.HasValue)
{
buf.WriteShort(publish.PacketID.Value);
}
buf.WriteBytes(publish.Content);
break;
case MessageType.PUBACK:
Puback puback = (Puback)header;
buf.SetByte(0, (byte)(((Int32)type) << 4));
buf.WriteShort(puback.PacketID.Value);
break;
case MessageType.PUBREC:
Pubrec pubrec = (Pubrec)header;
buf.SetByte(0, (byte)(((Int32)type) << 4));
buf.WriteShort(pubrec.PacketID.Value);
break;
case MessageType.PUBREL:
Pubrel pubrel = (Pubrel)header;
buf.SetByte(0, (byte)((((Int32)type) << 4) | 0x2));
buf.WriteShort(pubrel.PacketID.Value);
break;
case MessageType.PUBCOMP:
Pubcomp pubcomp = (Pubcomp)header;
buf.SetByte(0, (byte)(((Int32)type) << 4));
buf.WriteShort(pubcomp.PacketID.Value);
break;
case MessageType.SUBSCRIBE:
Subscribe sub = (Subscribe)header;
buf.SetByte(0, (byte)((((Int32)type) << 4) | 0x2));
buf.WriteShort(sub.PacketID.Value);
foreach (Topic subscription in sub.Topics)
{
buf.WriteShort(subscription.Name.Length);
buf.WriteBytes(Encoding.UTF8.GetBytes(subscription.Name));
buf.WriteByte((Int32)subscription.Qos);
}
break;
case MessageType.SUBACK:
Suback suback = (Suback)header;
buf.SetByte(0, (byte)(((Int32)type) << 4));
buf.WriteShort(suback.PacketID.Value);
foreach (SubackCode code in suback.ReturnCodes)
{
buf.WriteByte((Int32)code);
}
break;
case MessageType.UNSUBSCRIBE:
Unsubscribe unsub = (Unsubscribe)header;
buf.SetByte(0, (byte)((((Int32)type) << 4) | 0x2));
buf.WriteShort(unsub.PacketID.Value);
foreach (String topic in unsub.Topics)
{
buf.WriteShort(topic.Length);
buf.WriteBytes(Encoding.UTF8.GetBytes(topic));
}
break;
case MessageType.UNSUBACK:
Unsuback unsuback = (Unsuback)header;
buf.SetByte(0, (byte)(((Int32)type) << 4));
buf.WriteShort(unsuback.PacketID.Value);
break;
case MessageType.DISCONNECT:
case MessageType.PINGREQ:
case MessageType.PINGRESP:
buf.SetByte(0, (byte)(((Int32)type) << 4));
break;
default:
throw new MalformedMessageException("Invalid header type: " + type);
}
return(buf);
}
