public static IByteBuffer encode(SNMessage message)
{
int length = message.getLength();
IByteBuffer buf = Unpooled.Buffer(length);
if (length <= 255)
{
buf.WriteByte(length);
}
else
{
buf.WriteByte(THREE_OCTET_LENGTH_SUFFIX);
buf.WriteShort(length);
}
SNType type = message.getType();
buf.WriteByte((byte)(int)type);
switch (type)
{
case SNType.ADVERTISE:
Advertise advertise = (Advertise)message;
buf.WriteByte(advertise.gwID);
buf.WriteShort(advertise.duration);
break;
case SNType.SEARCHGW:
SearchGW searchGw = (SearchGW)message;
buf.WriteByte((byte)(int)searchGw.Radius);
break;
case SNType.GWINFO:
GWInfo gwInfo = (GWInfo)message;
buf.WriteByte(gwInfo.gwID);
if (gwInfo.gwAddress != null)
{
buf.WriteBytes(Encoding.UTF8.GetBytes(gwInfo.gwAddress));
}
break;
case SNType.CONNECT:
SNConnect connect = (SNConnect)message;
byte connectFlagsByte = Flags.encode(false, null, false, connect.WillPresent, connect.CleanSession, null);
buf.WriteByte(connectFlagsByte);
buf.WriteByte(connect.ProtocolID);
buf.WriteShort(connect.Duration);
buf.WriteBytes(Encoding.UTF8.GetBytes(connect.ClientID));
break;
case SNType.CONNACK:
case SNType.WILL_TOPIC_RESP:
case SNType.WILL_MSG_RESP:
ResponseMessage responseMessage = (ResponseMessage)message;
buf.WriteByte((byte)(int)responseMessage.ReturnCode);
break;
case SNType.WILL_TOPIC:
WillTopic willTopic = (WillTopic)message;
if (willTopic.Topic != null)
{
byte willTopicFlagsByte = Flags.encode(false, willTopic.Topic.getQos(), willTopic.Retain, false, false, willTopic.Topic.getType());
buf.WriteByte(willTopicFlagsByte);
buf.WriteBytes(Encoding.UTF8.GetBytes(willTopic.Topic.Value));
}
break;
case SNType.WILL_MSG:
WillMsg willMsg = (WillMsg)message;
buf.WriteBytes(willMsg.Content);
break;
case SNType.REGISTER:
Register register = (Register)message;
buf.WriteShort(register.topicID);
buf.WriteShort(register.MessageID.Value);
buf.WriteBytes(Encoding.UTF8.GetBytes(register.TopicName));
break;
case SNType.REGACK:
Regack regack = (Regack)message;
buf.WriteShort(regack.topicID);
buf.WriteShort(regack.MessageID.Value);
buf.WriteByte((byte)(int)regack.code);
break;
case SNType.PUBLISH:
SNPublish publish = (SNPublish)message;
byte publishFlagsByte = Flags.encode(publish.Dup, publish.SnTopic.getQos(), publish.Retain, false, false, publish.SnTopic.getType());
buf.WriteByte(publishFlagsByte);
buf.WriteBytes(publish.SnTopic.encode());
if (publish.MessageID.HasValue)
{
buf.WriteShort(publish.MessageID.Value);
}
else
{
buf.WriteShort(0);
}
buf.WriteBytes(publish.Content);
break;
case SNType.PUBACK:
SNPuback puback = (SNPuback)message;
buf.WriteShort(puback.topicID);
buf.WriteShort(puback.MessageID.Value);
buf.WriteByte((byte)(int)puback.ReturnCode);
break;
case SNType.PUBREC:
case SNType.PUBREL:
case SNType.PUBCOMP:
case SNType.UNSUBACK:
CountableMessage contableMessage = (CountableMessage)message;
buf.WriteShort(contableMessage.MessageID.Value);
break;
case SNType.SUBSCRIBE:
SNSubscribe subscribe = (SNSubscribe)message;
byte subscribeFlags = Flags.encode(subscribe.Dup, subscribe.SnTopic.getQos(), false, false, false, subscribe.SnTopic.getType());
buf.WriteByte(subscribeFlags);
buf.WriteShort(subscribe.MessageID.Value);
buf.WriteBytes(subscribe.SnTopic.encode());
break;
case SNType.SUBACK:
SNSuback suback = (SNSuback)message;
byte subackByte = Flags.encode(false, suback.AllowedQos, false, false, false, null);
buf.WriteByte(subackByte);
buf.WriteShort(suback.topicID);
buf.WriteShort(suback.MessageID.Value);
buf.WriteByte((byte)(int)suback.ReturnCode);
break;
case SNType.UNSUBSCRIBE:
SNUnsubscribe unsubscribe = (SNUnsubscribe)message;
byte unsubscribeFlags = Flags.encode(false, null, false, false, false, unsubscribe.SnTopic.getType());
buf.WriteByte(unsubscribeFlags);
buf.WriteShort(unsubscribe.MessageID.Value);
buf.WriteBytes(unsubscribe.SnTopic.encode());
break;
case SNType.PINGREQ:
if (length > 2)
{
SNPingreq pingreq = (SNPingreq)message;
buf.WriteBytes(Encoding.UTF8.GetBytes(pingreq.ClientID));
}
break;
case SNType.DISCONNECT:
if (length > 2)
{
SNDisconnect disconnect = (SNDisconnect)message;
buf.WriteShort(disconnect.Duration);
}
break;
case SNType.WILL_TOPIC_UPD:
WillTopicUpd willTopicUpd = (WillTopicUpd)message;
if (willTopicUpd.Topic != null)
{
byte willTopicUpdByte = Flags.encode(false, willTopicUpd.Topic.getQos(), willTopicUpd.Retain, false, false, null);
buf.WriteByte(willTopicUpdByte);
buf.WriteBytes(Encoding.UTF8.GetBytes(willTopicUpd.Topic.Value));
}
break;
case SNType.WILL_MSG_UPD:
WillMsgUpd willMsgUpd = (WillMsgUpd)message;
buf.WriteBytes(willMsgUpd.Content);
break;
case SNType.WILL_TOPIC_REQ:
case SNType.WILL_MSG_REQ:
case SNType.PINGRESP:
break;
case SNType.ENCAPSULATED:
Encapsulated encapsulated = (Encapsulated)message;
buf.WriteByte(Controls.encode(encapsulated.radius));
buf.WriteBytes(Encoding.UTF8.GetBytes(encapsulated.wirelessNodeID));
buf.WriteBytes(SNParser.encode(encapsulated.message));
break;
default:
break;
}
if (type != SNType.ENCAPSULATED && message.getLength() != buf.ReadableBytes)
{
throw new MalformedMessageException("invalid message encoding: expected length-" + message.getLength() + ",actual-" + buf.ReadableBytes);
}
return(buf);
}
public static SNMessage decode(IByteBuffer buf)
{
SNMessage message = null;
int currIndex = buf.ReaderIndex;
int messageLength = decodeContentLength(buf);
int bytesLeft = messageLength - (buf.ReaderIndex - currIndex);
short typeByte = (short)(0x00FF & (short)buf.ReadByte());
SNType?type = null;
try
{
type = (SNType)(int)(typeByte);
}
catch (Exception)
{
throw new MalformedMessageException("invalid packet type encoding:" + typeByte);
}
bytesLeft--;
switch (type.Value)
{
case SNType.ADVERTISE:
int advertiseGwID = 0x00FF & (short)buf.ReadByte();
int advertiseDuration = buf.ReadUnsignedShort();
message = new Advertise(advertiseGwID, advertiseDuration);
break;
case SNType.SEARCHGW:
int radius = 0x00FF & (short)buf.ReadByte();
message = new SearchGW((Radius)radius);
break;
case SNType.GWINFO:
int gwInfoGwID = 0x00FF & (short)buf.ReadByte();
bytesLeft--;
String gwInfoGwAddress = null;
if (bytesLeft > 0)
{
byte[] gwInfoGwAddressBytes = new byte[bytesLeft];
buf.ReadBytes(gwInfoGwAddressBytes);
gwInfoGwAddress = Encoding.UTF8.GetString(gwInfoGwAddressBytes);
}
message = new GWInfo(gwInfoGwID, gwInfoGwAddress);
break;
case SNType.CONNECT:
Flags connectFlags = Flags.decode(buf.ReadByte(), type.Value);
bytesLeft--;
int protocolID = buf.ReadByte();
bytesLeft--;
if (protocolID != SNConnect.MQTT_SN_PROTOCOL_ID)
{
throw new MalformedMessageException("Invalid protocolID " + protocolID);
}
int connectDuration = buf.ReadUnsignedShort();
bytesLeft -= 2;
if (!ValuesValidator.canRead(buf, bytesLeft))
{
throw new MalformedMessageException(type + ", clientID can't be empty");
}
byte[] connectClientIDBytes = new byte[bytesLeft];
buf.ReadBytes(connectClientIDBytes);
String connectClientID = Encoding.UTF8.GetString(connectClientIDBytes);
message = new SNConnect(connectFlags.CleanSession, connectDuration, connectClientID, connectFlags.Will);
break;
case SNType.CONNACK:
ReturnCode connackCode = (ReturnCode)(int)(buf.ReadByte());
message = new SNConnack(connackCode);
break;
case SNType.WILL_TOPIC_REQ:
message = WILL_TOPIC_REQ;
break;
case SNType.WILL_TOPIC:
Boolean willTopicRetain = false;
FullTopic willTopic = null;
if (bytesLeft > 0)
{
Flags willTopicFlags = Flags.decode(buf.ReadByte(), type.Value);
bytesLeft--;
willTopicRetain = willTopicFlags.Retain;
if (!ValuesValidator.canRead(buf, bytesLeft))
{
throw new MalformedMessageException(type + " invalid topic encoding");
}
byte[] willTopicBytes = new byte[bytesLeft];
buf.ReadBytes(willTopicBytes);
String willTopicValue = Encoding.UTF8.GetString(willTopicBytes);
willTopic = new FullTopic(willTopicValue, willTopicFlags.Qos.Value);
}
message = new WillTopic(willTopicRetain, willTopic);
break;
case SNType.WILL_MSG_REQ:
message = WILL_MSG_REQ;
break;
case SNType.WILL_MSG:
if (!ValuesValidator.canRead(buf, bytesLeft))
{
throw new MalformedMessageException(type + " content must not be empty");
}
byte[] willMessageContent = new byte[bytesLeft];
buf.ReadBytes(willMessageContent);
message = new WillMsg(willMessageContent);
break;
case SNType.REGISTER:
int registerTopicID = buf.ReadUnsignedShort();
if (!ValuesValidator.validateRegistrationTopicID(registerTopicID))
{
throw new MalformedMessageException(type + " invalid topicID value " + registerTopicID);
}
bytesLeft -= 2;
int registerMessageID = buf.ReadUnsignedShort();
if (!ValuesValidator.validateMessageID(registerMessageID))
{
throw new MalformedMessageException(type + " invalid messageID " + registerMessageID);
}
bytesLeft -= 2;
if (!ValuesValidator.canRead(buf, bytesLeft))
{
throw new MalformedMessageException(type + " must contain a valid topic");
}
byte[] registerTopicBytes = new byte[bytesLeft];
buf.ReadBytes(registerTopicBytes);
String registerTopicName = Encoding.UTF8.GetString(registerTopicBytes);
message = new Register(registerTopicID, registerMessageID, registerTopicName);
break;
case SNType.REGACK:
int regackTopicID = buf.ReadUnsignedShort();
if (!ValuesValidator.validateRegistrationTopicID(regackTopicID))
{
throw new MalformedMessageException(type + " invalid topicID value " + regackTopicID);
}
int regackMessageID = buf.ReadUnsignedShort();
if (!ValuesValidator.validateMessageID(regackMessageID))
{
throw new MalformedMessageException(type + " invalid messageID " + regackMessageID);
}
ReturnCode regackCode = (ReturnCode)(int)(buf.ReadByte());
message = new Regack(regackTopicID, regackMessageID, regackCode);
break;
case SNType.PUBLISH:
Flags publishFlags = Flags.decode(buf.ReadByte(), type.Value);
bytesLeft--;
int publishTopicID = buf.ReadUnsignedShort();
bytesLeft -= 2;
int publishMessageID = buf.ReadUnsignedShort();
bytesLeft -= 2;
if (publishFlags.Qos.Value != SNQoS.AT_MOST_ONCE && publishMessageID == 0)
{
throw new MalformedMessageException("invalid PUBLISH QoS-0 messageID:" + publishMessageID);
}
SNTopic publishTopic = null;
if (publishFlags.TopicType == TopicType.SHORT)
{
publishTopic = new ShortTopic(publishTopicID.ToString(), publishFlags.Qos.Value);
}
else
{
if (!ValuesValidator.validateTopicID(publishTopicID))
{
throw new MalformedMessageException(type + " invalid topicID value " + publishTopicID);
}
publishTopic = new IdentifierTopic(publishTopicID, publishFlags.Qos.Value);
}
byte[] data = new byte[bytesLeft];
if (bytesLeft > 0)
{
buf.ReadBytes(data);
}
message = new SNPublish(publishMessageID, publishTopic, data, publishFlags.Dup, publishFlags.Retain);
break;
case SNType.PUBACK:
int pubackTopicID = buf.ReadUnsignedShort();
if (!ValuesValidator.validateTopicID(pubackTopicID))
{
throw new MalformedMessageException(type + " invalid topicID value " + pubackTopicID);
}
int pubackMessageID = buf.ReadUnsignedShort();
if (!ValuesValidator.validateMessageID(pubackMessageID))
{
throw new MalformedMessageException(type + " invalid messageID " + pubackMessageID);
}
ReturnCode pubackCode = (ReturnCode)(int)(buf.ReadByte());
message = new SNPuback(pubackTopicID, pubackMessageID, pubackCode);
break;
case SNType.PUBREC:
int pubrecMessageID = buf.ReadUnsignedShort();
if (!ValuesValidator.validateMessageID(pubrecMessageID))
{
throw new MalformedMessageException(type + " invalid messageID " + pubrecMessageID);
}
message = new SNPubrec(pubrecMessageID);
break;
case SNType.PUBREL:
int pubrelMessageID = buf.ReadUnsignedShort();
if (!ValuesValidator.validateMessageID(pubrelMessageID))
{
throw new MalformedMessageException(type + " invalid messageID " + pubrelMessageID);
}
message = new SNPubrel(pubrelMessageID);
break;
case SNType.PUBCOMP:
int pubcompMessageID = buf.ReadUnsignedShort();
if (!ValuesValidator.validateMessageID(pubcompMessageID))
{
throw new MalformedMessageException(type + " invalid messageID " + pubcompMessageID);
}
message = new SNPubcomp(pubcompMessageID);
break;
case SNType.SUBSCRIBE:
Flags subscribeFlags = Flags.decode(buf.ReadByte(), type.Value);
bytesLeft--;
int subscribeMessageID = buf.ReadUnsignedShort();
if (subscribeMessageID == 0)
{
throw new MalformedMessageException(type + " invalid messageID " + subscribeMessageID);
}
bytesLeft -= 2;
if (!ValuesValidator.canRead(buf, bytesLeft) || bytesLeft < 2)
{
throw new MalformedMessageException(type + " invalid topic encoding");
}
byte[] subscribeTopicBytes = new byte[bytesLeft];
buf.ReadBytes(subscribeTopicBytes);
SNTopic subscribeTopic = null;
switch (subscribeFlags.TopicType)
{
case TopicType.NAMED:
String subscribeTopicName = Encoding.UTF8.GetString(subscribeTopicBytes);
subscribeTopic = new FullTopic(subscribeTopicName, subscribeFlags.Qos.Value);
break;
case TopicType.ID:
int subscribeTopicID = BitConverter.ToInt16(subscribeTopicBytes, 0);
if (!ValuesValidator.validateTopicID(subscribeTopicID))
{
throw new MalformedMessageException(type + " invalid topicID value " + subscribeTopicID);
}
subscribeTopic = new IdentifierTopic(subscribeTopicID, subscribeFlags.Qos.Value);
break;
case TopicType.SHORT:
String subscribeTopicShortName = Encoding.UTF8.GetString(subscribeTopicBytes);
subscribeTopic = new ShortTopic(subscribeTopicShortName, subscribeFlags.Qos.Value);
break;
}
message = new SNSubscribe(subscribeMessageID, subscribeTopic, subscribeFlags.Dup);
break;
case SNType.SUBACK:
Flags subackFlags = Flags.decode(buf.ReadByte(), type.Value);
int subackTopicID = buf.ReadUnsignedShort();
if (!ValuesValidator.validateRegistrationTopicID(subackTopicID))
{
throw new MalformedMessageException(type + " invalid topicID value " + subackTopicID);
}
int subackMessageID = buf.ReadUnsignedShort();
if (!ValuesValidator.validateMessageID(subackMessageID))
{
throw new MalformedMessageException(type + " invalid messageID " + subackMessageID);
}
ReturnCode subackCode = (ReturnCode)(int)(buf.ReadByte());
message = new SNSuback(subackTopicID, subackMessageID, subackCode, subackFlags.Qos.Value);
break;
case SNType.UNSUBSCRIBE:
Flags unsubscribeFlags = Flags.decode(buf.ReadByte(), type.Value);
bytesLeft--;
int unsubscribeMessageID = buf.ReadUnsignedShort();
if (!ValuesValidator.validateMessageID(unsubscribeMessageID))
{
throw new MalformedMessageException(type + " invalid messageID " + unsubscribeMessageID);
}
bytesLeft -= 2;
byte[] unsubscribeTopicBytes = new byte[bytesLeft];
buf.ReadBytes(unsubscribeTopicBytes);
SNTopic unsubscribeTopic = null;
switch (unsubscribeFlags.TopicType)
{
case TopicType.NAMED:
String unsubscribeTopicName = Encoding.UTF8.GetString(unsubscribeTopicBytes);
unsubscribeTopic = new FullTopic(unsubscribeTopicName, unsubscribeFlags.Qos.Value);
break;
case TopicType.ID:
int unsubscribeTopicID = BitConverter.ToInt16(unsubscribeTopicBytes, 0);
if (!ValuesValidator.validateTopicID(unsubscribeTopicID))
{
throw new MalformedMessageException(type + " invalid topicID value " + unsubscribeTopicID);
}
unsubscribeTopic = new IdentifierTopic(unsubscribeTopicID, unsubscribeFlags.Qos.Value);
break;
case TopicType.SHORT:
String unsubscribeTopicShortName = Encoding.UTF8.GetString(unsubscribeTopicBytes);
unsubscribeTopic = new ShortTopic(unsubscribeTopicShortName, unsubscribeFlags.Qos.Value);
break;
}
message = new SNUnsubscribe(unsubscribeMessageID, unsubscribeTopic);
break;
case SNType.UNSUBACK:
int unsubackMessageID = buf.ReadUnsignedShort();
if (!ValuesValidator.validateMessageID(unsubackMessageID))
{
throw new MalformedMessageException(type + " invalid messageID " + unsubackMessageID);
}
message = new SNUnsuback(unsubackMessageID);
break;
case SNType.PINGREQ:
String pingreqClientID = null;
if (bytesLeft > 0)
{
byte[] pingreqClientIDValue = new byte[bytesLeft];
buf.ReadBytes(pingreqClientIDValue);
pingreqClientID = Encoding.UTF8.GetString(pingreqClientIDValue);
}
message = new SNPingreq(pingreqClientID);
break;
case SNType.PINGRESP:
message = PING_RESP;
break;
case SNType.DISCONNECT:
int duration = 0;
if (bytesLeft > 0)
{
duration = buf.ReadUnsignedShort();
}
message = new SNDisconnect(duration);
break;
case SNType.WILL_TOPIC_UPD:
FullTopic willTopicUpdTopic = null;
Boolean willTopicUpdateRetain = false;
if (bytesLeft > 0)
{
Flags willTopicUpdFlags = Flags.decode(buf.ReadByte(), type.Value);
willTopicUpdateRetain = willTopicUpdFlags.Retain;
bytesLeft--;
byte[] willTopicUpdTopicBytes = new byte[bytesLeft];
buf.ReadBytes(willTopicUpdTopicBytes);
String willTopicUpdTopicValue = Encoding.UTF8.GetString(willTopicUpdTopicBytes);
willTopicUpdTopic = new FullTopic(willTopicUpdTopicValue, willTopicUpdFlags.Qos.Value);
}
message = new WillTopicUpd(willTopicUpdateRetain, willTopicUpdTopic);
break;
case SNType.WILL_MSG_UPD:
if (!ValuesValidator.canRead(buf, bytesLeft))
{
throw new MalformedMessageException(type + " must contain content data");
}
byte[] willMsgUpdContent = new byte[bytesLeft];
buf.ReadBytes(willMsgUpdContent);
message = new WillMsgUpd(willMsgUpdContent);
break;
case SNType.WILL_TOPIC_RESP:
ReturnCode willTopicRespCode = (ReturnCode)(int)buf.ReadByte();
message = new WillTopicResp(willTopicRespCode);
break;
case SNType.WILL_MSG_RESP:
ReturnCode willMsgRespCode = (ReturnCode)(int)buf.ReadByte();
message = new WillMsgResp(willMsgRespCode);
break;
case SNType.ENCAPSULATED:
Controls control = Controls.decode(buf.ReadByte());
bytesLeft--;
byte[] wirelessNodeIDBytes = new byte[bytesLeft];
buf.ReadBytes(wirelessNodeIDBytes);
String wirelessNodeID = Encoding.UTF8.GetString(wirelessNodeIDBytes);
SNMessage encapsulatedMessage = SNParser.decode(buf);
message = new Encapsulated(control.Radius, wirelessNodeID, encapsulatedMessage);
break;
}
if (buf.IsReadable())
{
throw new MalformedMessageException("not all bytes have been read from buffer:" + buf.ReadableBytes);
}
if (messageLength != message.getLength())
{
throw new MalformedMessageException(String.Format("Invalid length. Encoded: %d, actual: %d", messageLength, message.getLength()));
}
return(message);
}