public override byte[] GenerateBuffer()
{
Int32 packageLen = TransferConstant.COMMON_HEADER_SIZE + _HEAD_SIZE;
Byte[] buffer = new Byte[packageLen];
using (var ms = new MemoryStream(buffer))
{
var bw = new BinaryWriter(ms);
base.Header.FillHeader(bw, packageLen);
bw.Write(this.ContextId);
bw.Write(this.Position);
bw.Write(this.Size);
bw.Flush();
}
ProtocolParser.FillValidCode(buffer);
return(buffer);
}
/// <summary>
/// 解析收到的数据队列线程方法
/// </summary>
/// <param name="receiveDatagramInfo">要解析的数据</param>
private void ProReceiveData(ReceiveDatagramInfo receiveDatagramInfo)
{
try
{
var data = receiveDatagramInfo.Data;
if (data == null)
{
return;
}
if (data.Length < TransferConstant.COMMON_HEADER_SIZE)
{
Loger.Warn($"收到的数据长度[{data.Length}]小于公共头[{TransferConstant.COMMON_HEADER_SIZE}],忽略...");
return;
}
var srcEndPoint = receiveDatagramInfo.SrcEndPoint;
using (var ms = new MemoryStream(data))
{
var br = new BinaryReader(ms);
#region 数据验证
Int32 sync = br.ReadInt32();// 同步字
if (sync != TransferConstant.SYNC)
{
throw new Exception($"收到数据的同步头:{sync}与期望的同步头:{TransferConstant.SYNC}不一致,忽略");
}
Int32 packageLen = br.ReadInt32();// 本次传输数据总长度
if (packageLen != data.Length)
{
throw new Exception($"收到数据的长度:{data.Length}与期望的数据长度:{packageLen}不一致,忽略");
}
var p = br.BaseStream.Position;
Int32 validCode = br.ReadInt32();//校验码,以后再验证
//重置校验码为填充值
byte[] validCodeBuf = BitConverter.GetBytes(TransferConstant.VALID_CODE_FILL);
br.BaseStream.Seek(p, SeekOrigin.Begin);
br.BaseStream.Write(validCodeBuf, 0, validCodeBuf.Length);
//校验数据传输正确性
bool parseResult = ProtocolParser.ValidData(validCode, data);
if (!parseResult)
{
Loger.Warn("数据正确性校验不通过");
return;
}
#endregion
var header = new CommonHeader(br);
switch (header.Cmd)
{
case TransferCommands.SendNotify:
this._receiver.ProSendNotify(new SendDataNotifyMessage(header, br, srcEndPoint));
break;
case TransferCommands.ResourceResponse:
this._receiver.ProResourceResponse(new ResourceResponseMessage(header, br, srcEndPoint), data);
break;
case TransferCommands.TransferCompletedAck:
this._receiver.ProTransferCompletedAck(new TransferCompletedAckMessage(header, br, srcEndPoint));
break;
case TransferCommands.ResourceRequest:
this.ProResourceRequest(new ResourceRequestMessage(header, br, srcEndPoint));
break;
case TransferCommands.TransferCompleted:
this.ProTransferCompleted(new TransferCompletedMessage(header, br, srcEndPoint));
break;
default:
throw new Exception($"未知命令{header.Cmd}");
}
}
}
catch (Exception ex)
{
Loger.Error(ex, "解析收到的数据异常");
}
}
