private BaseCommand CreateCommand(List <byte> CommandBuffer)
{
byte[] cmdBytes = null;
lock (CommandBuffer)
{
if (CommandBuffer.Count < 10)
{
Logger.Instance().Error("CreateCommand() Error! CommandBuffer.Count<10");
return(null);
}
cmdBytes = new byte[CommandBuffer.Count];
CommandBuffer.CopyTo(cmdBytes);
}
byte msgID = cmdBytes[1];
byte packageSize = cmdBytes[2];
BaseCommand cmd = null;
//C9单包数据长度为6
if (packageSize == 6)
{
cmd = CommandFactory.CreateCommand(msgID, true);
}
else
{
cmd = CommandFactory.CreateCommand(msgID, false);
}
if (cmd == null)
{
string msg = string.Format("CreateCommand() Error! MessageID={0}", msgID);
Logger.Instance().Error(msg);
return(null);
}
cmd.Direction = cmdBytes[0];
cmd.Channel = cmdBytes[2];
//分析命令数据长度20180119改为两个字节了
cmd.PayloadLength = (ushort)(cmdBytes[4] << 8);
cmd.PayloadLength += (ushort)cmdBytes[3];
//20180119改为两个字节了
cmd.PayloadLengthReverse = (ushort)(cmdBytes[6] << 8);
cmd.PayloadLengthReverse += (ushort)cmdBytes[5];
//分离出最后4字节的Checksum
cmd.Checksum = (uint)(cmdBytes[cmdBytes.Length - 1] << 24);
cmd.Checksum += (uint)(cmdBytes[cmdBytes.Length - 2] << 16);
cmd.Checksum += (uint)(cmdBytes[cmdBytes.Length - 3] << 8);
cmd.Checksum += (uint)(cmdBytes[cmdBytes.Length - 4]);
//重新计算泵端传入的数据checksum，如果对应不上，记录日志，由上层应用酌情处理，但不能作超时处理
uint checksum = CRC32.CalcCRC32Partial(cmdBytes, cmdBytes.Length - 4, CRC32.CRC32_SEED);
checksum ^= CRC32.CRC32_SEED;
//在DUBUG状态下就不要去检查checksum
#if !DEBUG
if ((cmd.Checksum ^ checksum) != 0)
{
cmd.ErrorMsg = "Checksum Error";
string buffer2String = BytesToString(cmdBytes, 0, cmdBytes.Length);
Logger.Instance().ErrorFormat("ProtocolEngine::CreateCommand() Checksum error, buffer={0}", buffer2String);
}
#endif
//将PayloadData提取出来，方便生成字段
byte[] arrFieldsBuf = new byte[cmd.PayloadLength];
int index = cmdBytes.Length - arrFieldsBuf.Length - 4;
if (index <= 0)
{
string msg = string.Format("CreateCommand() Error! index<=0 cmdBytes.Length={0} arrFieldsBuf.Length={1}", cmdBytes.Length, arrFieldsBuf.Length);
Logger.Instance().Error(msg);
return(null);
}
Array.Copy(cmdBytes, index, arrFieldsBuf, 0, arrFieldsBuf.Length);
//将字段填进命令
cmd.SetBytes(arrFieldsBuf);
return(cmd);
}
