public int Serialize(ref byte[] bytes, int offset, JT808Package value)
{
// 1. 先判断是否分包（理论下发不需分包，但为了统一还是加上分包处理）
// 2. 先序列化数据体，根据数据体的长度赋值给头部，在序列化头部。
int messageBodyOffset = 0;
if (value.Header.MessageBodyProperty.IsPackge)
{ //3. 先写入分包消息总包数、包序号
messageBodyOffset += JT808BinaryExtensions.WriteUInt16Little(bytes, messageBodyOffset, value.Header.MessageBodyProperty.PackgeCount);
messageBodyOffset += JT808BinaryExtensions.WriteUInt16Little(bytes, messageBodyOffset, value.Header.MessageBodyProperty.PackageIndex);
}
// 4. 数据体
Type jT808BodiesImplType = JT808MsgIdFactory.GetBodiesImplTypeByMsgId(value.Header.MsgId);
if (jT808BodiesImplType != null)
{
if (value.Bodies != null)
{
if (!value.Bodies.SkipSerialization)
{
// 4.1 处理数据体
messageBodyOffset = JT808FormatterResolverExtensions.JT808DynamicSerialize(JT808FormatterExtensions.GetFormatter(jT808BodiesImplType), ref bytes, offset, value.Bodies);
}
}
}
byte[] messageBodyBytes = null;
if (messageBodyOffset != 0)
{
messageBodyBytes = new byte[messageBodyOffset];
Array.Copy(bytes, 0, messageBodyBytes, 0, messageBodyOffset);
}
// ------------------------------------开始组包
// 1.起始符
offset += JT808BinaryExtensions.WriteByteLittle(bytes, offset, value.Begin);
// 2.赋值头数据长度
value.Header.MessageBodyProperty.DataLength = messageBodyOffset;
offset = JT808FormatterExtensions.GetFormatter <JT808Header>().Serialize(ref bytes, offset, value.Header);
if (messageBodyOffset != 0)
{
Array.Copy(messageBodyBytes, 0, bytes, offset, messageBodyOffset);
offset += messageBodyOffset;
messageBodyBytes = null;
}
// 4.校验码
offset += JT808BinaryExtensions.WriteByteLittle(bytes, offset, bytes.ToXor(1, offset));
// 5.终止符
offset += JT808BinaryExtensions.WriteByteLittle(bytes, offset, value.End);
return(JT808Utils.JT808Escape(ref bytes, offset));
}
public JT808Package Deserialize(ReadOnlySpan <byte> bytes, out int readSize)
{
int offset = 0;
JT808Package jT808Package = new JT808Package();
// 转义还原——>验证校验码——>解析消息
// 1. 解码（转义还原）
ReadOnlySpan <byte> buffer = JT808Utils.JT808DeEscape(bytes);
// 2. 验证校验码
// 2.1. 获取校验位索引
int checkIndex = buffer.Length - 2;
// 2.2. 获取校验码
jT808Package.CheckCode = buffer[checkIndex];
// 2.3. 从消息头到校验码前一个字节
byte checkCode = buffer.ToXor(1, checkIndex);
// 2.4. 验证校验码
if (!JT808GlobalConfig.Instance.SkipCRCCode)
{
if (jT808Package.CheckCode != checkCode)
{
throw new JT808Exception(JT808ErrorCode.CheckCodeNotEqual, $"{jT808Package.CheckCode}!={checkCode}");
}
}
jT808Package.Begin = buffer[offset];
offset = offset + 1;
// 3.初始化消息头
try
{
jT808Package.Header = JT808FormatterExtensions.GetFormatter <JT808Header>().Deserialize(buffer.Slice(offset), out readSize);
}
catch (Exception ex)
{
throw new JT808Exception(JT808ErrorCode.HeaderParseError, ex);
}
offset = readSize;
if (jT808Package.Header.MessageBodyProperty.DataLength != 0)
{
Type jT808BodiesImplType = JT808MsgIdFactory.GetBodiesImplTypeByMsgId(jT808Package.Header.MsgId);
if (jT808BodiesImplType != null)
{
//4.分包消息体 从17位开始 或 未分包消息体 从13位开始
if (jT808Package.Header.MessageBodyProperty.IsPackge)
{
//消息总包数2位+包序号2位=4位
offset = offset + 2 + 2;
if (jT808Package.Header.MessageBodyProperty.PackageIndex > 1)
{
try
{
//5.处理第二包之后的分包数据消息体
jT808Package.Bodies = JT808FormatterResolverExtensions.JT808DynamicDeserialize(
JT808FormatterExtensions.GetFormatter(typeof(JT808SplitPackageBodies)),
buffer.Slice(offset + 1, jT808Package.Header.MessageBodyProperty.DataLength),
out readSize);
}
catch (Exception ex)
{
throw new JT808Exception(JT808ErrorCode.BodiesParseError, ex);
}
}
else
{
try
{
//5.处理消息体
jT808Package.Bodies = JT808FormatterResolverExtensions.JT808DynamicDeserialize(
JT808FormatterExtensions.GetFormatter(jT808BodiesImplType),
buffer.Slice(offset + 1, jT808Package.Header.MessageBodyProperty.DataLength),
out readSize);
}
catch (Exception ex)
{
throw new JT808Exception(JT808ErrorCode.BodiesParseError, ex);
}
}
}
else
{
try
{
//5.处理消息体
jT808Package.Bodies = JT808FormatterResolverExtensions.JT808DynamicDeserialize(
JT808FormatterExtensions.GetFormatter(jT808BodiesImplType),
buffer.Slice(offset + 1, jT808Package.Header.MessageBodyProperty.DataLength),
out readSize);
}
catch (Exception ex)
{
throw new JT808Exception(JT808ErrorCode.BodiesParseError, ex);
}
}
}
}
jT808Package.End = buffer[buffer.Length - 1];
readSize = buffer.Length;
return(jT808Package);
}
public JT808HeaderPackage Deserialize(ReadOnlySpan <byte> bytes, out int readSize, IJT808Config config)
{
int offset = 0;
JT808HeaderPackage jT808HeaderPackage = new JT808HeaderPackage();
// 转义还原——>验证校验码——>解析消息
// 1. 解码（转义还原）
ReadOnlySpan <byte> buffer = JT808Utils.JT808DeEscape(bytes);
// 2. 验证校验码
// 2.1. 获取校验位索引
int checkIndex = buffer.Length - 2;
// 2.2. 获取校验码
int checkCode1 = buffer[checkIndex];
// 2.3. 从消息头到校验码前一个字节
byte checkCode2 = buffer.ToXor(1, checkIndex);
// 2.4. 验证校验码
if (!JT808GlobalConfig.Instance.SkipCRCCode)
{
if (checkCode1 != checkCode2)
{
throw new JT808Exception(JT808ErrorCode.CheckCodeNotEqual, $"{checkCode1}!={checkCode2}");
}
}
offset += 1;
// 3.初始化消息头
try
{
jT808HeaderPackage.Header = JT808FormatterExtensions.GetFormatter <JT808Header>().Deserialize(buffer.Slice(offset, 13), out readSize, config);
}
catch (Exception ex)
{
throw new JT808Exception(JT808ErrorCode.HeaderParseError, ex);
}
offset = readSize;
if (jT808HeaderPackage.Header.MessageBodyProperty.DataLength != 0)
{
Type jT808BodiesImplType = JT808MsgIdFactory.GetBodiesImplTypeByMsgId(jT808HeaderPackage.Header.MsgId);
if (jT808BodiesImplType != null)
{
if (jT808HeaderPackage.Header.MessageBodyProperty.IsPackge)
{//4.分包消息体 从17位开始 或 未分包消息体 从13位开始
//消息总包数2位+包序号2位=4位
offset = offset + 2 + 2;
}
if (jT808HeaderPackage.Header.MessageBodyProperty.DataLength != 0)
{
try
{
//5.处理消息体
jT808HeaderPackage.Bodies = buffer.Slice(offset + 1, jT808HeaderPackage.Header.MessageBodyProperty.DataLength).ToArray();
}
catch (Exception ex)
{
throw new JT808Exception(JT808ErrorCode.BodiesParseError, ex);
}
}
}
}
readSize = buffer.Length;
return(jT808HeaderPackage);
}