public JT808Package Deserialize(ReadOnlySpan <byte> bytes, int offset, IJT808FormatterResolver formatterResolver, out int readSize)
{
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 = JT808DeEscape(bytes, 0, bytes.Length);
// 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 (jT808Package.CheckCode != checkCode)
{
throw new JT808Exception($"{jT808Package.CheckCode}!={checkCode}");
}
jT808Package.Begin = buffer[offset];
offset = offset + 1;
// 3.初始化消息头
try
{
jT808Package.Header = formatterResolver.GetFormatter <JT808Header>().Deserialize(buffer, offset, formatterResolver, out readSize);
}
catch (Exception ex)
{
throw new JT808Exception($"消息头解析错误,offset:{offset.ToString()}", ex);
}
offset = readSize;
if (jT808Package.Header.MessageBodyProperty.DataLength != 0)
{
JT808BodiesTypeAttribute jT808BodiesTypeAttribute = jT808Package.Header.MsgId.GetAttribute <JT808BodiesTypeAttribute>();
if (jT808BodiesTypeAttribute != null)
{
if (jT808Package.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 (jT808Package.Header.MessageBodyProperty.DataLength != 0)
{
try
{
//5.处理消息体
jT808Package.Bodies = JT808FormatterResolverExtensions.JT808DynamicDeserialize(formatterResolver.GetFormatterDynamic(jT808BodiesTypeAttribute.JT808BodiesType), buffer.Slice(offset, jT808Package.Header.MessageBodyProperty.DataLength).ToArray(), offset, formatterResolver, out readSize);
}
catch (Exception ex)
{
throw new JT808Exception($"消息体解析错误,offset:{offset.ToString()}", ex);
}
}
}
}
jT808Package.End = buffer[bytes.Length - 1];
readSize = buffer.Length;
return(jT808Package);
}
private static void InitMap()
{
foreach (var item in Enum.GetNames(typeof(JT808MsgId)))
{
JT808MsgId msgId = item.ToEnum <JT808MsgId>();
JT808BodiesTypeAttribute jT808BodiesTypeAttribute = msgId.GetAttribute <JT808BodiesTypeAttribute>();
map.Add((ushort)msgId, jT808BodiesTypeAttribute?.JT808BodiesType);
}
}
public int Serialize(IMemoryOwner <byte> memoryOwner, 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(memoryOwner, messageBodyOffset, value.Header.MessageBodyProperty.PackgeCount);
messageBodyOffset += JT808BinaryExtensions.WriteUInt16Little(memoryOwner, messageBodyOffset, value.Header.MessageBodyProperty.PackageIndex);
}
// 4. 数据体
//JT808.Protocol.Enums.JT808MsgId 映射对应消息特性
JT808BodiesTypeAttribute jT808BodiesTypeAttribute = value.Header.MsgId.GetAttribute <JT808BodiesTypeAttribute>();
if (jT808BodiesTypeAttribute != null)
{
if (value.Bodies != null)
{
// 4.1 处理数据体
messageBodyOffset = JT808FormatterResolverExtensions.JT808DynamicSerialize(JT808FormatterExtensions.GetFormatter(jT808BodiesTypeAttribute.JT808BodiesType), memoryOwner, offset, value.Bodies);
}
}
Memory <byte> messageBodyBytes = null;
if (messageBodyOffset != 0)
{
messageBodyBytes = new Memory <byte>(new byte[messageBodyOffset]);
memoryOwner.Memory.Slice(0, messageBodyOffset).CopyTo(messageBodyBytes);
}
// ------------------------------------开始组包
// 1.起始符
offset += JT808BinaryExtensions.WriteByteLittle(memoryOwner, offset, value.Begin);
// 2.赋值头数据长度
value.Header.MessageBodyProperty.DataLength = messageBodyOffset;
offset = JT808FormatterExtensions.GetFormatter <JT808Header>().Serialize(memoryOwner, offset, value.Header);
if (messageBodyOffset != 0)
{
JT808BinaryExtensions.CopyTo(messageBodyBytes.Span, memoryOwner.Memory.Span, offset);
offset += messageBodyOffset;
messageBodyBytes = null;
}
// 4.校验码
offset += JT808BinaryExtensions.WriteByteLittle(memoryOwner, offset, memoryOwner.Memory.Span.ToXor(1, offset));
// 5.终止符
offset += JT808BinaryExtensions.WriteByteLittle(memoryOwner, offset, value.End);
byte[] temp = JT808Escape(memoryOwner.Memory.Slice(0, offset).Span);
memoryOwner.Memory.Span.Clear();
JT808BinaryExtensions.CopyTo(temp, memoryOwner.Memory.Span, 0);
return(temp.Length);
}
private void InitMap()
{
foreach (var item in Enum.GetNames(typeof(JT808MsgId)))
{
JT808MsgId msgId = item.ToEnum<JT808MsgId>();
if (!map.ContainsKey((ushort)msgId))
{
JT808BodiesTypeAttribute jT808BodiesTypeAttribute = msgId.GetAttribute<JT808BodiesTypeAttribute>();
if (jT808BodiesTypeAttribute != null)
{
map.Add((ushort)msgId, jT808BodiesTypeAttribute.JT808BodiesType);
}
}
}
}
public int Serialize(ref byte[] bytes, int offset, JT808Package value, IJT808FormatterResolver formatterResolver)
{
// 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(ref bytes, messageBodyOffset, value.Header.MessageBodyProperty.PackgeCount);
messageBodyOffset += JT808BinaryExtensions.WriteUInt16Little(ref bytes, messageBodyOffset, value.Header.MessageBodyProperty.PackageIndex);
}
// 4. 数据体
//JT808.Protocol.Enums.JT808MsgId 映射对应消息特性
JT808BodiesTypeAttribute jT808BodiesTypeAttribute = value.Header.MsgId.GetAttribute <JT808BodiesTypeAttribute>();
if (jT808BodiesTypeAttribute != null)
{
if (value.Bodies != null)
{
// 4.1 处理数据体
messageBodyOffset = JT808FormatterResolverExtensions.JT808DynamicSerialize(formatterResolver.GetFormatterDynamic(jT808BodiesTypeAttribute.JT808BodiesType), ref bytes, offset, value.Bodies, formatterResolver);
}
}
byte[] messageBodyBytes = null;
if (messageBodyOffset != 0)
{
messageBodyBytes = bytes.AsSpan().Slice(0, messageBodyOffset).ToArray();
}
// ------------------------------------开始组包
// 1.起始符
offset += JT808BinaryExtensions.WriteLittle(ref bytes, offset, value.Begin);
// 2.赋值头数据长度
value.Header.MessageBodyProperty.DataLength = messageBodyOffset;
offset = formatterResolver.GetFormatter <JT808Header>().Serialize(ref bytes, offset, value.Header, formatterResolver);
if (messageBodyOffset != 0)
{
Buffer.BlockCopy(messageBodyBytes, 0, bytes, offset, messageBodyOffset);
offset += messageBodyOffset;
}
// 4.校验码
offset += JT808BinaryExtensions.WriteLittle(ref bytes, offset, bytes.ToXor(1, offset));
// 5.终止符
offset += JT808BinaryExtensions.WriteLittle(ref bytes, offset, value.End);
byte[] temp = JT808Escape(bytes.AsSpan().Slice(0, offset));
Buffer.BlockCopy(temp, 0, bytes, 0, temp.Length);
return(temp.Length);
}