/// <summary>
/// 封装数据包。
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
private byte[] makeData(byte[] data)
{
bool isCompress = false;
if (data.Length > 200)
{
isCompress = true;
data = ZlibHelper.CompressBytes(data);
}
data = SecurityUtil.Xor(data); //加密
ushort crc = Crc16.CalculateCrc16(data); //校验码。
ushort bodyLen = (ushort)(data.Length + 3); //包体长度
MyMemoryStream m = new MyMemoryStream();
m.WriteUShort(bodyLen);
m.WriteBool(isCompress);
m.WriteUShort(crc);
m.Write(data, 0, data.Length);
data = m.ToArray();
m.Close();
return(data);
}
private void receiveCallback(IAsyncResult ar)
{
int len = 0;
try
{
len = this.socket.EndReceive(ar); //len为真实的收到的字节数
}
catch (Exception)
{
Debug.Log("链接断了。");
}
if (len > 0)
{
byte[] tmp = new byte[len];
Buffer.BlockCopy(this.buffer, 0, tmp, 0, len);
//每次收到数据，把数据写入流末尾
myReceiveBuffer.Position = myReceiveBuffer.Length; ///流里的读写的起始位置，设定到流的末尾
myReceiveBuffer.Write(tmp, 0, tmp.Length); //把新收到的数据追加到流的末尾。
///处理粘包的循环
while (true)
{
//1.从流的开头读取包体长度
myReceiveBuffer.Position = 0;
ushort bodyLen = myReceiveBuffer.ReadUshort();
ushort fullLen = (ushort)(bodyLen + 2);
if (myReceiveBuffer.Length >= fullLen) //说明够一个完整的包了。
{
myReceiveBuffer.Position = 2; //从是否压缩的标识的位置开始读取标识。
bool isCompress = myReceiveBuffer.ReadBool();
ushort crc = myReceiveBuffer.ReadUshort();
//读取数据部分
byte[] data = new byte[bodyLen - 3];
myReceiveBuffer.Read(data, 0, data.Length);
//////以上是 ，该读取的都读取出来了。。。
ushort newCrc = Crc16.CalculateCrc16(data);
if (newCrc == crc) //校验通过。
{
data = SecurityUtil.Xor(data); //解密
if (isCompress) //如果是经过压缩的，解个压缩。
{
data = ZlibHelper.DeCompressBytes(data);
}
///把接出来的数据包放入队列。主线程中再处理数据。
msgQueue.Enqueue(data);///放入队列等待主线程处理。
}
///剩余数据在容器中保留，刚处理完的，删除。
ushort remainLen = (ushort)(myReceiveBuffer.Length - fullLen);
if (remainLen > 0)
{
byte[] remainArr = new byte[remainLen];
myReceiveBuffer.Position = fullLen;
myReceiveBuffer.Read(remainArr, 0, remainArr.Length);
///清楚容器（myReceiveBuffer）里的所有内容
myReceiveBuffer.SetLength(0);
myReceiveBuffer.Position = 0;
//剩余部分再写回来
myReceiveBuffer.Write(remainArr, 0, remainArr.Length);
}
else
{
///剩余部分长度为 0，，清楚容器（myReceiveBuffer）里的所有内容
myReceiveBuffer.SetLength(0);
myReceiveBuffer.Position = 0;
break;
}
}
else
{
break;
}
}
///再次收下次的数据，否则只能收取一次数据。
this.socket.BeginReceive(this.buffer, 0, buffer.Length, SocketFlags.None, receiveCallback, null);
}
else //len==0链接断了
{
Debug.Log("链接断了。");
}
}
