public JT809_0x9300 Deserialize(ReadOnlySpan <byte> bytes, out int readSize) { int offset = 0; JT809_0x9300 jT809_0X9300 = new JT809_0x9300(); jT809_0X9300.SubBusinessType = (JT809SubBusinessType)JT809BinaryExtensions.ReadUInt16Little(bytes, ref offset); jT809_0X9300.DataLength = JT809BinaryExtensions.ReadUInt32Little(bytes, ref offset); //JT809.Protocol.Enums.JT809BusinessType 映射对应消息特性 JT809BodiesTypeAttribute jT809SubBodiesTypeAttribute = jT809_0X9300.SubBusinessType.GetAttribute <JT809BodiesTypeAttribute>(); if (jT809SubBodiesTypeAttribute == null) { throw new JT809Exception(JT809ErrorCode.GetAttributeError, $"JT809BodiesTypeAttribute Not Found>{jT809_0X9300.SubBusinessType.ToString()}"); } try { jT809_0X9300.SubBodies = JT809FormatterResolverExtensions.JT809DynamicDeserialize(JT809FormatterExtensions.GetFormatter(jT809SubBodiesTypeAttribute.JT809BodiesType), bytes.Slice(offset, (int)jT809_0X9300.DataLength), out readSize); } catch { throw new JT809Exception(JT809ErrorCode.SubBodiesParseError, $"SubBusinessType>{jT809_0X9300.SubBusinessType.ToString()}"); } readSize = offset; return(jT809_0X9300); }
public JT809Package Deserialize(ReadOnlySpan <byte> bytes, out int readSize) { int offset = 0; JT809Package jT809Package = new JT809Package(); // 转义还原——>验证校验码——>解析消息 // 1. 解码(转义还原) ReadOnlySpan <byte> buffer = JT809DeEscape(bytes); // 2. 验证校验码 // 2.1. 获取校验位索引 int checkIndex = buffer.Length - 3; // 2.2. 获取校验码 int crcCodeOffset = 0; jT809Package.CRCCode = JT809BinaryExtensions.ReadUInt16Little(buffer.Slice(checkIndex, 2), ref crcCodeOffset); if (!JT809GlobalConfig.Instance.SkipCRCCode) { // 2.3. 从消息头到校验码前一个字节 ushort checkCode = buffer.ToCRC16_CCITT(1, checkIndex); // 2.4. 验证校验码 if (jT809Package.CRCCode != checkCode) { throw new JT809Exception(JT809ErrorCode.CRC16CheckInvalid, $"{jT809Package.CRCCode.ToString()}!={checkCode.ToString()}"); } } jT809Package.BeginFlag = JT809BinaryExtensions.ReadByteLittle(buffer, ref offset); // 3.初始化消息头 try { jT809Package.Header = JT809FormatterExtensions.GetFormatter <JT809Header>().Deserialize(buffer.Slice(offset, JT809Header.FixedByteLength), out readSize); } catch (Exception ex) { throw new JT809Exception(JT809ErrorCode.HeaderParseError, $"offset>{offset.ToString()}", ex); } offset += readSize; // 5.数据体处理 // 5.1 判断是否有数据体(总长度-固定长度)> 0 if ((jT809Package.Header.MsgLength - JT809Package.FixedByteLength) > 0) { //JT809.Protocol.JT809Enums.JT809BusinessType 映射对应消息特性 JT809BodiesTypeAttribute jT809BodiesTypeAttribute = jT809Package.Header.BusinessType.GetAttribute <JT809BodiesTypeAttribute>(); if (jT809BodiesTypeAttribute != null) { try { // 5.2 是否加密 switch (jT809Package.Header.EncryptFlag) { case JT809Header_Encrypt.None: //5.3 处理消息体 jT809Package.Bodies = JT809FormatterResolverExtensions.JT809DynamicDeserialize(JT809FormatterExtensions.GetFormatter(jT809BodiesTypeAttribute.JT809BodiesType), buffer.Slice(offset, checkIndex - offset), out readSize); break; case JT809Header_Encrypt.Common: byte[] bodiesData = JT809GlobalConfig.Instance.Encrypt.Decrypt(buffer.Slice(offset, checkIndex - offset).ToArray(), jT809Package.Header.EncryptKey); jT809Package.Bodies = JT809FormatterResolverExtensions.JT809DynamicDeserialize(JT809FormatterExtensions.GetFormatter(jT809BodiesTypeAttribute.JT809BodiesType), bodiesData, out readSize); break; } } catch (Exception ex) { throw new JT809Exception(JT809ErrorCode.BodiesParseError, $"offset>{offset.ToString()}", ex); } } } jT809Package.EndFlag = buffer[buffer.Length - 1]; readSize = buffer.Length; return(jT809Package); }