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);
}