protocol

报文协议

[title]	[num]	[len0][data0]...
4		4		4			

操作定义:

用户注册:
	c->s	title:10	num:2	data0:<char>username[max:20]	data1:<char>password[max:20,min:6]
	//发送注册请求
	s->c	title:11	num:1	data0:<int>userid
	//注册成功，返回用户id
	s->c	title:19	num:0
	//注册失败

用户登录:
	c->s	title:20	num:2	data0:<int>userid	data1:<char>password[max:20,min:6]
	//发送登录请求
	s->c	title:21	num:1	data0:<char>username[max:20]
	//登录成功
	s->c	title:29	num:0
	//登录失败

用户退出:
	c->s	title:28	num:0
	//发送退出请求
	
消息-发送方:
	c->s	title:30	num:3	data0:<int>tag	data1:<int>destid	data2:<char>message[max:4000]
	//向desid发送标识码为tag的消息
	s->c	title:31	num:1	data0:<int>tag
	//标识码为tag的消息发送成功
	s->c	title:39	num:1	data0:<int>tag
	//标识码为tag的消息发送失败
	
消息-接收方:
	s->c	title:33	num:3	data0:<int>-tag	data1:<int>sourceid	data2:<char>message[max:4000]
	//分发标识为-tag的消息
	c->s	title:34	num:1	data0:<int>-tag
	//标识为-tag的消息接收成功

查询在线用户:
	c->s	title:40	num:0
	//发送查询请求
	s->c	title:41	num:2x	data0:<int>userid0	data1:<char>username0[] ...
	//返回在线用户的id和用户名
	s->c	title:49	num:0
	//查询失败

文件传输-发送方:
	c->s	title:50	num:4	data0:<int>tag	data1:<int>destid	data2:<int>filesize	data3:<char>filename[max:256]
	//发起传输请求	
	s->c	title:51	num:4	data0:<int>tag	data1:<int>ret	data2:<char>IP[max:16]	data3:<int>port
	//标识码为tag的文件传输请求获得 同意ret=0/拒绝ret=1
	c->c	title:52	num:3	data0:<int>tag	data1:<int>sliceno	data2:<bytes>data[max:2K]
	//以2k分片发送标识码为tag的文件

文件传输-接收方:
	s->c	title:55	num:4	data0:<int>-tag	data1:<int>sourceid	data2:<int>filesize	data3:<char>filename[max:256]
	//分发传输请求
	c->s	title:56	num:4	data0:<int>-tag	data1:<int>ret	data2:<char>IP[max:16]	data3:<int>port
	//标识码为-tag的传输请求 同意ret=0/拒绝ret=1
	c->c	title:53	num:2	data0:<int>-tag	data1:<int>sliceno
	//sliceno片接收成功