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); }
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); }