public IPMsgUdpPacketEncoder(IPMsgUdpPacket packet)
{
this._packet = packet;
}
public Packet Resolve()
{
IPMsgUdpPacket packet = new IPMsgUdpPacket();
//更改在线状态消息示例：1:1559263918:hyron-<06f73d2bf8f254bd>:DESKTOP-904FV8J:258212096:202?��?[�H����]\0202g\0\nUN:hyron-<06f73d2bf8f254bd>\nHN:DESKTOP-904FV8J\nNN:202张小锋[食事中]\nGN:202g\nVS:00010002:4:99:106"
string str = Encoding.UTF8.GetString(_datagram);
int index = str.IndexOf(":");
if (index < 0)
{
return(null);
}
string strTmp = str.Substring(0, index);
short ver = 0;
if (!short.TryParse(strTmp, out ver))
{
return(null);
}
packet.Version = ver;
int index2 = str.IndexOf(":", index + 1);
if (index2 < 0)
{
return(null);
}
strTmp = str.Substring(index + 1, index2 - index - 1);
long id = 0;
if (!long.TryParse(strTmp, out id))
{
return(null);
}
packet.ID = id;
index = str.IndexOf(":", index2 + 1);
if (index < 0)
{
return(null);
}
packet.Sender = str.Substring(index2 + 1, index - index2 - 1);
index2 = str.IndexOf(":", index + 1);
if (index2 < 0)
{
return(null);
}
packet.SenderHost = str.Substring(index + 1, index2 - index - 1);
index = str.IndexOf(":", index2 + 1);
if (index < 0)
{
return(null);
}
strTmp = str.Substring(index2 + 1, index - index2 - 1);
ulong cmd = 0;
if (!ulong.TryParse(strTmp, out cmd))
{
return(null);
}
packet.Command = cmd;
//查找消息扩展区
index2 = str.IndexOf("\0", index + 1);
if (index2 < 0)
{
//无扩展区
packet.Message = str.Substring(index + 1);
}
else
{
packet.Message = str.Substring(index + 1, index2 - index - 1);
packet.Extend = str.Substring(index2 + 1);
}
if ((packet.Command & IPMsgUdpPacket.IPMSG_CMD_OPT_UTF8) == 0)
{
//如果不是UTF8编码的话，前面已经用UTF8编码给转化了，所以要ASCII转换回来
//TODO 此处稍微和IPMsg有差异，暂未调查清楚编码问题(除了上下线以外一般是UTF8编码的)
packet.Sender = UTF82ASCII(packet.Sender);
packet.SenderHost = UTF82ASCII(packet.SenderHost);
packet.Message = UTF82ASCII(packet.Message);
}
//处理扩展区消息
if (!string.IsNullOrEmpty(packet.ExtendMessage))
{
index = packet.ExtendMessage.IndexOf("\0");
string strExt = null;
string strExt2 = null;
if (index < 0)
{
strExt = packet.ExtendMessage;
}
else
{
strExt = packet.ExtendMessage.Substring(0, index);
strExt2 = packet.ExtendMessage.Substring(index + 1);
}
if (strExt[0] != '\n')
{
if ((packet.Command & IPMsgUdpPacket.IPMSG_CMD_OPT_UTF8) == 0)
{
strExt = UTF82ASCII(strExt);
}
packet.Extend = strExt;
}
else if (string.IsNullOrEmpty(strExt2))
{
strExt2 = strExt;
}
if (!string.IsNullOrEmpty(strExt2) &&
strExt2[0] == '\n' &&
(packet.Command & IPMsgUdpPacket.IPMSG_CAPUTF8OPT) != 0)
{
string[] fields = strExt2.Split('\n');
foreach (string field in fields)
{
if (field.StartsWith("UN"))
{
packet.Sender = field.Substring(3);
}
else if (field.StartsWith("HN"))
{
packet.SenderHost = field.Substring(3);
}
else if (field.StartsWith("NN"))
{
switch (packet.CommandMode)
{
case IPMsgUdpPacket.IPMSG_CMD_BR_ENTRY:
case IPMsgUdpPacket.IPMSG_CMD_BR_ABSENCE:
packet.Message = field.Substring(3);
break;
}
}
else if (field.StartsWith("GN"))
{
switch (packet.CommandMode)
{
case IPMsgUdpPacket.IPMSG_CMD_BR_ENTRY:
case IPMsgUdpPacket.IPMSG_CMD_BR_ABSENCE:
packet.Extend = field.Substring(3);
break;
}
}
else if (field.StartsWith("VS"))
{
//IPMsg 4.x的消息，暂时未对应
}
}
}
}
return(packet);
}
