ENET（四）enet_protocol_send_acknowledgements

最新推荐文章于 2018-01-09 23:57:46 发布

zhuix7788

最新推荐文章于 2018-01-09 23:57:46 发布

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分类专栏： Enet 文章标签： enet

本文链接：https://blog.youkuaiyun.com/zhuix7788/article/details/45558087

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功能：将当前要发送的ENetProtocol信息存放在host->command中。对端为peer，数据包内容在peer中保存，这里只用到了peer的acknowledgement结构体数据。

commandCount、bufferCount等都是对端的个数，如果是一对一发送，该值为1.while循环就只循环一次。

函数：enet_protocol_send_acknowledgements

static void 
enet_protocol_send_acknowledgements (ENetHost * host, ENetPeer * peer)
{                                                                                           
    ENetProtocol * command = & host -> commands [host -> commandCount];  //最终保存目标
    ENetBuffer * buffer = & host -> buffers [host -> bufferCount];         
    ENetAcknowledgement * acknowledgement;
    ENetListIterator currentAcknowledgement;
    enet_uint16 reliableSequenceNumber;
 
    currentAcknowledgement = enet_list_begin (& peer -> acknowledgements);   //将待发送的指令存入currentAcknowledgement，之后还会降currentAcknowledgement赋给acknowledgement
 
    int circle = 0; 
    while (currentAcknowledgement != enet_list_end (& peer -> acknowledgements))       //只循环了一次
    {
        circle++;
        if(circle >= 4)
        {    
            host -> continueSending = 1; 
            break;
        }    
       if (command >= & host -> commands [sizeof (host -> commands) / sizeof (ENetProtocol)»
           buffer >= & host -> buffers [sizeof (host -> buffers) / sizeof (ENetBuffer)] ||
           peer -> mtu - host -> packetSize < sizeof (ENetProtocolAcknowledge))
       {    
          host -> continueSending = 1; 
          break;
       }    
 
       acknowledgement = (ENetAcknowledgement *) currentAcknowledgement;
 
       currentAcknowledgement = enet_list_next (currentAcknowledgement);
 
       buffer -> data = command;
       buffer -> dataLength = sizeof (ENetProtocolAcknowledge);
       host -> packetSize += buffer -> dataLength;            //为8*count，一对一是8
       reliableSequenceNumber = ENET_HOST_TO_NET_16 (acknowledgement -> command.header.reliableSequenceNumber);  //在1的基础上每次累加256
       command -> header.command = ENET_PROTOCOL_COMMAND_ACKNOWLEDGE;
       command -> header.channelID = acknowledgement -> command.header.channelID;
       command -> header.reliableSequenceNumber = reliableSequenceNumber;
       command -> acknowledge.receivedReliableSequenceNumber = reliableSequenceNumber;
       command -> acknowledge.receivedSentTime = ENET_HOST_TO_NET_16 (acknowledgement -> sentTime);
 
       if ((acknowledgement -> command.header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_DISCONNECT)
         enet_protocol_dispatch_state (host, peer, ENET_PEER_STATE_ZOMBIE);
        //销毁中转的指针 
       enet_list_remove (& acknowledgement -> acknowledgementList);
       enet_free (acknowledgement);
 
       ++ command;
       ++ buffer;
    }
    host -> commandCount = command - host -> commands;
    host -> bufferCount = buffer - host -> buffers;
}