/// <summary>
/// 二进制数据 转成 内容包数据
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
public JT808_PackageData Bytes2PackageData(byte[] data)
{
JT808_PackageData ret = new JT808_PackageData();
// 1. 16byte 或 12byte 消息头
JT808_PackageData.MsgHeader msgHeader = this.ParseMsgHeaderFromBytes(data);
ret.msgHeader = msgHeader;
int msgBodyByteStartIndex = 12 + 1;
// 2. 消息体
// 有子包信息,消息体起始字节后移四个字节:消息包总数(word(16))+包序号(word(16))
if (msgHeader.hasSubPackage)
{
msgBodyByteStartIndex = 16 + 1;
}
byte[] tmp = new byte[msgHeader.msgBodyLength];
Buffer.BlockCopy(data, msgBodyByteStartIndex, tmp, 0, tmp.Length);
ret.setMsgBodyBytes(tmp);
// 3. 去掉分隔符之后，最后一位就是校验码
int checkSumInPkg = data[data.Length - 1 - 1];
int calculatedCheckSum = ExplainUtils.getCheckSum4JT808(data, 0 + 1, data.Length - 1 - 1);
ret.checkSum = (checkSumInPkg);
if (checkSumInPkg != calculatedCheckSum)
{
ret.errorlog = ret.errorlog + "检验码不一致;";// string.Format("检验码不一致,msgid:{},pkg:{},calculated:{}", msgHeader.getMsgId(), checkSumInPkg, calculatedCheckSum);
}
return(ret);
}
