IEEE 802.3以太网帧封装

来源：互联网发布：js 切换视频播放编辑：程序博客网时间：2024/05/22 10:49

要求：

1．要求画出界面，以太网帧的数据部分、源MAC地址和目的MAC地址均从界面输入；

2．计算后的校验和字段和封装后的结果可以从界面上输出；

3．生成多项式G（X）=X⁸+X²+X¹+1；

（或者生成多项式G（X）=X³²+X²⁶+X²³+X²²+X¹⁶+X¹²+X¹¹+X¹⁰+X⁸+X⁷+X⁵+X⁴+X²+X¹+1；）

就是计算帧检测序列FCS，一个简单的算法

觉得用C写黑框框有点low，C++的MFC又不会，所以用了当年学的HTML+CSS+JS写了一个

参考代码：

<!DOCTYPE html><html><head><title>IEEE 802.3以太网帧封装</title><meta charset="utf-8"><link rel="stylesheet" type="text/css" href="ComNet1.css"></head><script type="text/javascript">//求FCSfunction f( num){var P =  new Array(1,0,0,0,0,0,1,1,1);var n = 8,len = 0;for( var i = 1; i <= n; i++)num *= 10;var tmp = num;var M = new Array();while( tmp >= 1){M[len++] = tmp%10;tmp = parseInt(tmp/10);}for( var i = 0; i <= len/2; i++){var tmp = M[i];M[i] = M[len-1-i];M[len-1-i] = tmp;}var cnt = 0,head = 0,tail = n;while( tail < len && (tail-head) == n){var flag = 1;var headchange;for( var i = head; i <= tail; i++){var tmp;if( M[i] == P[i-head])tmp = 0;elsetmp = 1;console.log(M[i]+" "+P[i-head]+" "+tmp);if( tmp == 1 && flag == 1){headchange = i;flag = 0;M[i] = tmp;}elseM[i] = tmp;}if( !flag)  head = headchange;if( cnt == 10)while( tail < len)tail++;while( (tail-head) < n)tail++;cnt++;console.log(tail+' '+head+' '+len)}console.log(cnt);var ans = 0;for( var i = head; i <= len; i++)ans = parseInt(ans*10+parseInt(M[i]));console.log(ans);return M;}window.onload=function(){//获得了值var data = document.getElementById("in1");var mudi = document.getElementById("in2");var yuan = document.getElementById("in3");var cdzd = document.getElementById("in4");var submit = document.getElementById("sub");sub.onclick=function(){if( data != "" && yuan != "" && mudi != ""){var table = document.getElementById("mytable");var oneRow = table.insertRow();var cell1 = oneRow.insertCell();cell1.innerHTML = "0xAAAAAAAAAAAAAA";var cell2 = oneRow.insertCell();cell2.innerHTML = "0xAB";var cell3  = oneRow.insertCell();cell3.innerHTML = mudi.value;var cell4 = oneRow.insertCell();cell4.innerHTML = yuan.value;var cell5 = oneRow.insertCell();cell5.innerHTML = cdzd.value;//默认为IP包var cell6 =oneRow.insertCell();cell6.innerHTML = data.value;var cell7 = oneRow.insertCell();var tmp = data.value;tmp = f(data.value);cell7.innerHTML = tmp;}}}</script><body><div class="in"><form >以太网帧的数据部分<input id="in1" type="text" name=""><br>目  的  MAC  地  址 <input id="in2" type="text" name=""><br>源    MAC   地  址   <input id="in3" type="text" name=""><br>长    度    字     段    <input id="in4" type="text" name=""><br><button id="sub" type="button">submit</button></form></div><div class="content"><table id="mytable" cellpadding="10" cellspacing="0"><tr><th class="bt qdm">前导码</th><th class="bt djf">帧前定界符</th><th class="bt md">目的地址</th><th class="bt y">源地址</th><th class="bt cd">长度字段</th><th class="bt sj">数据字段</th><th class="bt jy">校验字段</th></tr><tr><td></td></tr></table></div></content></body></html><!-- 008byte101101ff:ff:ff:ff:ff:ffcc:00:0b:b8:00:000x08060x080612byte1101000101:00:0c:cc:cc:cccc:00:18:10:00:000x0800 -->

*{margin: 0;list-style: none;text-align: center;}body{width: 1000px;margin: 0 auto;margin-top: 50px;background-image: url(1.jpg);/*background-image: url(2.jpg);background-image: url(3.jpg);*/}.in{b/*order: 1px solid red;*/margin: 20px;}.in form input{display: inline-block;text-align: left;margin: 5px;width: 200px;height: 17px;}.in form #sub{display: inline-block;border-radius: 5px;height: 30px;line-height: 30px;width: 80px;color: gray;background-color: white;margin: 15px 0;}.content{width: 100%;border: 1px solid black;}.content table{/*border: 1px solid red;*/}.content table tr .bt{width: 114px;border: 1px solid black;}

最后的效果：

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