public JTNEHeaderPackage Deserialize(ReadOnlySpan <byte> bytes, out int readSize)
{
int offset = 0;
// 1.进行固定头校验
if (bytes[offset] != JTNEPackage.BeginFlag && bytes[offset + 1] == JTNEPackage.BeginFlag)
{
throw new JTNEException(JTNEErrorCode.BeginFlagError, $"{bytes[offset]},{bytes[offset + 1]}");
}
// 2.进行BCC校验码
// 校验位 = 报文长度 - 最后一位（校验位）
if (!JTNEGlobalConfigs.Instance.SkipCRCCode)
{
byte bCCCode = bytes[bytes.Length - 1];
byte bCCCode2 = bytes.ToXor(2, bytes.Length - 1);
if (bCCCode != bCCCode2)
{
throw new JTNEException(JTNEErrorCode.BCCCodeError, $"request:{bCCCode}!=calculate:{bCCCode2}");
}
}
JTNEHeaderPackage jTNEPackage = new JTNEHeaderPackage();
offset += 2;
// 3.命令标识
jTNEPackage.MsgId = JTNEBinaryExtensions.ReadByteLittle(bytes, ref offset);
// 4.应答标识
jTNEPackage.AskId = JTNEBinaryExtensions.ReadByteLittle(bytes, ref offset);
// 5.VIN
jTNEPackage.VIN = JTNEBinaryExtensions.ReadStringLittle(bytes, ref offset, 17);
// 6.数据加密方式
jTNEPackage.EncryptMethod = JTNEBinaryExtensions.ReadByteLittle(bytes, ref offset);
// 7.数据单元长度是数据单元的总字节数
jTNEPackage.DataUnitLength = JTNEBinaryExtensions.ReadUInt16Little(bytes, ref offset);
// 8.数据体
// 8.1.根据数据加密方式进行解码
// todo: 8.2.解析出对应数据体
if (jTNEPackage.DataUnitLength > 0)
{
Type jTNEBodiesImplType = JTNEMsgIdFactory.GetBodiesImplTypeByMsgId(jTNEPackage.MsgId);
if (jTNEBodiesImplType != null)
{
int bodyReadSize = 0;
try
{
jTNEPackage.Bodies = bytes.Slice(offset, jTNEPackage.DataUnitLength).ToArray();
}
catch (Exception ex)
{
throw new JTNEException(JTNEErrorCode.BodiesParseError, ex);
}
offset += bodyReadSize;
}
}
// 9.校验码
jTNEPackage.BCCCode = JTNEBinaryExtensions.ReadByteLittle(bytes, ref offset);
readSize = offset;
return(jTNEPackage);
}
/// <summary>
/// 注册自定义消息
/// </summary>
/// <typeparam name="TJTNEBodies"></typeparam>
/// <param name="msgId"></param>
/// <returns></returns>
public JTNEGlobalConfigs Register_CustomMsgId <TJTNEBodies>(byte customMsgId)
where TJTNEBodies : JTNEBodies
{
JTNEMsgIdFactory.SetMap <TJTNEBodies>(customMsgId);
return(instance.Value);
}
/// <summary>
/// 重写消息
/// </summary>
/// <typeparam name="TJTNEBodies"></typeparam>
/// <param name="overwriteMsgId"></param>
/// <returns></returns>
public JTNEGlobalConfigs Overwrite_MsgId <TJTNEBodies>(byte overwriteMsgId)
where TJTNEBodies : JTNEBodies
{
JTNEMsgIdFactory.ReplaceMap <TJTNEBodies>(overwriteMsgId);
return(instance.Value);
}
public int Serialize(ref byte[] bytes, int offset, JTNEPackage value)
{
// 1.起始符1
offset += JTNEBinaryExtensions.WriteByteLittle(bytes, offset, value.BeginFlag1);
// 2.起始符2
offset += JTNEBinaryExtensions.WriteByteLittle(bytes, offset, value.BeginFlag2);
// 3.命令标识
offset += JTNEBinaryExtensions.WriteByteLittle(bytes, offset, value.MsgId);
// 4.应答标识
offset += JTNEBinaryExtensions.WriteByteLittle(bytes, offset, value.AskId);
// 5.VIN
offset += JTNEBinaryExtensions.WriteStringPadRightLittle(bytes, offset, value.VIN, 17);
// 6.数据加密方式
offset += JTNEBinaryExtensions.WriteByteLittle(bytes, offset, value.EncryptMethod);
// 7.记录当前偏移量
int tmpOffset = offset;
// 8.数据体
Type jTNEBodiesImplType = JTNEMsgIdFactory.GetBodiesImplTypeByMsgId(value.MsgId);
int messageBodyOffset = 0;
if (jTNEBodiesImplType != null)
{
if (value.Bodies != null)
{
// 8.1.处理数据体
// 8.2.判断是否有加密
messageBodyOffset = JTNEFormatterResolverExtensions.JTNEDynamicSerialize(
JTNEFormatterExtensions.GetFormatter(jTNEBodiesImplType),
ref bytes,
offset + FixedDataBodyLength,
value.Bodies);
if (value.EncryptMethod == 0x01)
{
// 9.通过tmpOffset反写数据单元长度
JTNEBinaryExtensions.WriteUInt16Little(bytes, tmpOffset, (ushort)(messageBodyOffset - offset - FixedDataBodyLength));
offset = messageBodyOffset;
}
else
{
if (JTNEGlobalConfigs.Instance.DataBodiesEncrypt != null)
{
// 8.1.先进行分割数据体
var bodiesData = bytes.AsSpan(tmpOffset + FixedDataBodyLength, messageBodyOffset - offset - FixedDataBodyLength).ToArray();
// 8.2.将数据体进行加密
var data = JTNEGlobalConfigs.Instance.DataBodiesEncrypt(value.EncryptMethod)
.Encrypt(bodiesData);
// 9.通过tmpOffset反写加密后数据单元长度
JTNEBinaryExtensions.WriteUInt16Little(bytes, tmpOffset, (ushort)data.Length);
// 8.3.写入加密后的数据体
offset += FixedDataBodyLength;
offset += JTNEBinaryExtensions.WriteBytesLittle(bytes, offset, data);
}
}
}
else
{
// 9.数据单元长度
offset += JTNEBinaryExtensions.WriteUInt16Little(bytes, offset, 0);
}
}
else
{
// 9.数据单元长度
offset += JTNEBinaryExtensions.WriteUInt16Little(bytes, offset, 0);
}
// 10.校验码
var bccCode = bytes.ToXor(2, offset);
offset += JTNEBinaryExtensions.WriteByteLittle(bytes, offset, bccCode);
return(offset);
}
