/// <summary>解码</summary>
/// <param name="context"></param>
/// <param name="pk"></param>
/// <returns></returns>
protected override IList <Packet> Decode(IHandlerContext context, Packet pk)
{
var ss = context.Session;
var mcp = ss["CodecItem"] as CodecItem;
if (mcp == null)
{
ss["CodecItem"] = mcp = new CodecItem();
}
return(Parse(pk, mcp, ms => GetLength(ms, Offset, Size), Expire));
}
/// <summary>解码</summary>
/// <param name="context"></param>
/// <param name="pk">包</param>
/// <returns></returns>
protected IList <Packet> Decode(IHandlerContext context, Packet pk)
{
var ss = context.Owner as IExtend;
var mcp = ss["CodecItem"] as CodecItem;
if (mcp == null)
{
ss["CodecItem"] = mcp = new CodecItem();
}
var pks = Parse(pk, mcp, pk1 => GetLineLength(pk1));
return(pks);
}
/// <summary>解码</summary>
/// <param name="context"></param>
/// <param name="pk"></param>
/// <returns></returns>
protected override IList<IMessage> Decode(IHandlerContext context, Packet pk)
{
var ss = context.Session;
var mcp = ss["CodecItem"] as CodecItem;
if (mcp == null) ss["CodecItem"] = mcp = new CodecItem();
var pks = Parse(pk, mcp, DefaultMessage.GetLength);
var list = pks.Select(e =>
{
var msg = new DefaultMessage();
if (!msg.Read(e)) return null;
return msg as IMessage;
}).ToList();
return list;
}
/// <summary>解码</summary>
/// <param name="context"></param>
/// <param name="pk"></param>
/// <returns></returns>
protected override IList <Packet> Decode(IHandlerContext context, Packet pk)
{
var ss = context.Owner as IExtend;
var mcp = ss["CodecItem"] as CodecItem;
if (mcp == null)
{
ss["CodecItem"] = mcp = new CodecItem();
}
var pks = Parse(pk, mcp, ms => GetLength(ms, Offset, Size), Expire);
// 跳过头部长度
var len = Offset + Math.Abs(Size);
foreach (var item in pks)
{
item.Set(item.Data, item.Offset + len, item.Count - len);
//item.SetSub(len, item.Count - len);
}
return(pks);
}
/// <summary>解码</summary>
/// <param name="context"></param>
/// <param name="pk"></param>
/// <returns></returns>
protected override IList <IMessage> Decode(IHandlerContext context, Packet pk)
{
var ss = context.Owner as IExtend;
var mcp = ss["CodecItem"] as CodecItem;
if (mcp == null)
{
ss["CodecItem"] = mcp = new CodecItem();
}
var pks = Parse(pk, mcp, DefaultMessage.GetLength);
var list = pks.Select(e =>
{
var msg = new DefaultMessage();
if (!msg.Read(e))
{
return(null);
}
return(msg as IMessage);
}).ToList();
return(list);
}
/// <summary>分析数据流，得到一帧数据</summary>
/// <param name="pk">待分析数据包</param>
/// <param name="codec">参数</param>
/// <param name="getLength">获取长度</param>
/// <param name="expire">缓存有效期</param>
/// <returns></returns>
protected virtual IList <Packet> Parse(Packet pk, CodecItem codec, Func <Packet, Int32> getLength, Int32 expire = 5000)
{
var _ms = codec.Stream;
var nodata = _ms == null || _ms.Position < 0 || _ms.Position >= _ms.Length;
var list = new List <Packet>();
// 内部缓存没有数据，直接判断输入数据流是否刚好一帧数据，快速处理，绝大多数是这种场景
if (nodata)
{
if (pk == null)
{
return(list.ToArray());
}
var idx = 0;
while (idx < pk.Total)
{
//var pk2 = new Packet(pk.Data, pk.Offset + idx, pk.Total - idx);
var pk2 = pk.Slice(idx);
var len = getLength(pk2);
if (len <= 0 || len > pk2.Count)
{
break;
}
pk2.Set(pk2.Data, pk2.Offset, len);
//pk2.SetSub(0, len);
list.Add(pk2);
idx += len;
}
// 如果没有剩余，可以返回
if (idx == pk.Total)
{
return(list.ToArray());
}
// 剩下的
//pk = new Packet(pk.Data, pk.Offset + idx, pk.Total - idx);
pk = pk.Slice(idx);
}
if (_ms == null)
{
codec.Stream = _ms = new MemoryStream();
}
// 加锁，避免多线程冲突
lock (_ms)
{
// 超过该时间后按废弃数据处理
var now = TimerX.Now;
if (_ms.Length > _ms.Position && codec.Last.AddMilliseconds(expire) < now)
{
_ms.SetLength(0);
_ms.Position = 0;
}
codec.Last = now;
// 合并数据到最后面
if (pk != null && pk.Total > 0)
{
var p = _ms.Position;
_ms.Position = _ms.Length;
pk.WriteTo(_ms);
_ms.Position = p;
}
// 尝试解包
while (_ms.Position < _ms.Length)
{
//var pk2 = new Packet(_ms.GetBuffer(), (Int32)_ms.Position, (Int32)_ms.Length);
var pk2 = new Packet(_ms);
var len = getLength(pk2);
// 资源不足一包
if (len <= 0 || len > pk2.Total)
{
break;
}
// 解包成功
pk2.Set(pk2.Data, pk2.Offset, len);
//pk2.SetSub(0, len);
list.Add(pk2);
_ms.Seek(len, SeekOrigin.Current);
}
// 如果读完了数据，需要重置缓冲区
if (_ms.Position >= _ms.Length)
{
_ms.SetLength(0);
_ms.Position = 0;
}
return(list);
}
}
