public V45Packet(byte[] indata, int start = 0, bool ignoreLength = false)
{
try
{
this.m_status = indata[start];
this.m_command = (V45Commands)indata[start + 1];
this.m_sender = indata[start + 2];
this.m_receiver = indata[start + 3];
this.m_length = BitConverter.ToUInt16(indata, start + 4);
if (m_length != indata.Length && !ignoreLength)
{
throw new LengthException("Length error. Suggested: " + this.m_length.ToString() + " Received: " + indata.Length.ToString());
}
this.m_payLoad = new byte[m_length - 8];
Array.Copy(indata, start + 6, m_payLoad, 0, m_length - 8);
//.AddRange(indata.Skip(6).Take(this.Length - 8).ToArray());
CRC16CITT tmpCRC = new CRC16CITT(CRC16CITT.InitialCrcValue.Zeros);
this.m_CRC = BitConverter.ToUInt16(indata, start + 6 + this.Payload.Length);
UInt16 tmprc = tmpCRC.ComputeChecksum(indata.Skip(start).Take(this.Length - 2).ToArray());
if (this.m_CRC != tmprc)//steve--skip calibration commmand
{
throw new CrcException("CRC error. Computed: " + tmprc.ToString() + " Received: " + this.m_CRC.ToString());
}
}
catch (Exception)
{
throw;
}
}
private ushort getCRC()
{
ushort rtn = 0;
byte[] tmpdata = new byte[6 + m_payLoad.Length];
tmpdata[0] = this.m_status;
tmpdata[1] = (byte)this.m_command;
tmpdata[2] = this.m_sender;
tmpdata[3] = this.m_receiver;
tmpdata[4] = (byte)this.m_length;
tmpdata[5] = (byte)(this.m_length >> 8);
Array.Copy(m_payLoad, 0, tmpdata, 6, m_payLoad.Length);
CRC16CITT tmpCRC = new CRC16CITT(CRC16CITT.InitialCrcValue.Zeros);
rtn = tmpCRC.ComputeChecksum(tmpdata);
return(rtn);
}