public override void pro(byte[] b, ref int off, int n)
{
int pre_off = off; //上次偏移位置
for (int i = 0; i < prot_list.Count; i++)
{
ProtDom pd = prot_dict[prot_list[i]]; //当前子协议域
pd.pro(b, ref off, n); //递归调用
n -= off - pre_off; //增加了多少字节，总字节数相应减掉
pre_off = off;
}
}
public void pro(byte[] b, int off, int n) //处理二进制包，缓存，偏移，长度（off之后）
{
prot_root.pro(b, ref off, n);
}