/// <summary>
/// Parse bytes for a PUBLISH message
/// </summary>
/// <param name="fixedHeaderFirstByte">First fixed header byte</param>
/// <param name="protocolVersion">Protocol Version</param>
/// <param name="channel">Channel connected to the broker</param>
/// <returns>PUBLISH message instance</returns>
public static MqttMsgPublish Parse(byte fixedHeaderFirstByte, byte protocolVersion, IMqttNetworkChannel channel)
{
var msg = new MqttMsgPublish();
var remainingLength = MqttMsgBase.decodeRemainingLength(channel);
var buffer = new byte[remainingLength];
var received = channel.Receive(buffer);
int index = 0;
var topicUtf8Length = ((buffer[index++] << 8) & 0xFF00);
topicUtf8Length |= buffer[index++];
var topicUtf8 = new byte[topicUtf8Length];
Array.Copy(buffer, index, topicUtf8, 0, topicUtf8Length);
index += topicUtf8Length;
msg.topic = new String(Encoding.UTF8.GetChars(topicUtf8));
msg._qosLevel = ((byte)((fixedHeaderFirstByte & QOS_LEVEL_MASK) >> QOS_LEVEL_OFFSET)).ToQOS();
msg._dupFlag = (((fixedHeaderFirstByte & DUP_FLAG_MASK) >> DUP_FLAG_OFFSET) == 0x01);
msg._retainFlag = (((fixedHeaderFirstByte & RETAIN_FLAG_MASK) >> RETAIN_FLAG_OFFSET) == 0x01);
// message id is valid only with QOS level 1 or QOS level 2
if ((msg._qosLevel == QOS.QOS1) || (msg._qosLevel == QOS.QOS2))
{
msg._messageId = (ushort)((buffer[index++] << 8) & 0xFF00);
msg._messageId |= (buffer[index++]);
}
int messageSize = remainingLength - index;
int remaining = messageSize;
int messageOffset = 0;
msg.message = new byte[messageSize];
Array.Copy(buffer, index, msg.message, messageOffset, received - index);
remaining -= (received - index);
messageOffset += (received - index);
// if payload isn't finished
while (remaining > 0)
{
// receive other payload data
received = channel.Receive(buffer);
Array.Copy(buffer, 0, msg.message, messageOffset, received);
remaining -= received;
messageOffset += received;
}
return(msg);
}
/// <summary>
/// Parse bytes for a PUBLISH message
/// </summary>
/// <param name="fixedHeaderFirstByte">First fixed header byte</param>
/// <param name="protocolVersion">Protocol Version</param>
/// <param name="channel">Channel connected to the broker</param>
/// <returns>PUBLISH message instance</returns>
public static MqttMsgPublish Parse(byte fixedHeaderFirstByte, byte protocolVersion, IMqttNetworkChannel channel)
{
byte[] buffer;
int index = 0;
byte[] topicUtf8;
int topicUtf8Length;
MqttMsgPublish msg = new MqttMsgPublish();
// get remaining length and allocate buffer
int remainingLength = MqttMsgBase.decodeRemainingLength(channel);
buffer = new byte[remainingLength];
// read bytes from socket...
int received = channel.Receive(buffer);
// topic name
topicUtf8Length = ((buffer[index++] << 8) & 0xFF00);
topicUtf8Length |= buffer[index++];
topicUtf8 = new byte[topicUtf8Length];
Array.Copy(buffer, index, topicUtf8, 0, topicUtf8Length);
index += topicUtf8Length;
msg.topic = new String(Encoding.UTF8.GetChars(topicUtf8));
// read QoS level from fixed header
msg.qosLevel = (byte)((fixedHeaderFirstByte & QOS_LEVEL_MASK) >> QOS_LEVEL_OFFSET);
// check wrong QoS level (both bits can't be set 1)
if (msg.qosLevel > QOS_LEVEL_EXACTLY_ONCE)
{
throw new MqttClientException(MqttClientErrorCode.QosNotAllowed);
}
// read DUP flag from fixed header
msg.dupFlag = (((fixedHeaderFirstByte & DUP_FLAG_MASK) >> DUP_FLAG_OFFSET) == 0x01);
// read retain flag from fixed header
msg.retain = (((fixedHeaderFirstByte & RETAIN_FLAG_MASK) >> RETAIN_FLAG_OFFSET) == 0x01);
// message id is valid only with QOS level 1 or QOS level 2
if ((msg.qosLevel == QOS_LEVEL_AT_LEAST_ONCE) ||
(msg.qosLevel == QOS_LEVEL_EXACTLY_ONCE))
{
// message id
msg.messageId = (ushort)((buffer[index++] << 8) & 0xFF00);
msg.messageId |= (buffer[index++]);
}
// get payload with message data
int messageSize = remainingLength - index;
int remaining = messageSize;
int messageOffset = 0;
msg.message = new byte[messageSize];
// BUG FIX 26/07/2013 : receiving large payload
// copy first part of payload data received
Array.Copy(buffer, index, msg.message, messageOffset, received - index);
remaining -= (received - index);
messageOffset += (received - index);
// if payload isn't finished
while (remaining > 0)
{
// receive other payload data
received = channel.Receive(buffer);
Array.Copy(buffer, 0, msg.message, messageOffset, received);
remaining -= received;
messageOffset += received;
}
return(msg);
}
