base64编码解码代码
Code<html>
<head>
<meta http-equiv=Content-Type content=text/html;charset=gb2312>
<script language=javascript>
var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var base64DecodeChars = new Array(
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1);
function base64encode(str) {
var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var out, i, len;
var c1, c2, c3;
len = str.length;
i = 0;
out = "";
while(i < len) {
c1 = str.charCodeAt(i++) & 0xff;
if(i == len) {
out += base64EncodeChars.charAt(c1 >> 2);
out += base64EncodeChars.charAt((c1 & 0x3) << 4);
out += "==";
break;
}
c2 = str.charCodeAt(i++);
if(i == len) {
out += base64EncodeChars.charAt(c1 >> 2);
out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
out += base64EncodeChars.charAt((c2 & 0xF) << 2);
out += "=";
break;
}
c3 = str.charCodeAt(i++);
out += base64EncodeChars.charAt(c1 >> 2);
out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
out += base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >>6));
out += base64EncodeChars.charAt(c3 & 0x3F);
}
return out;
}
function base64decode(str) {
var c1, c2, c3, c4;
var i, len, out;
len = str.length;
i = 0;
out = "";
while(i < len) {
do {
c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
} while(i < len && c1 == -1);
if (c1 == -1) break;
do {
c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
} while(i < len && c2 == -1);
if (c2 == -1) break;
out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));
do {
c3 = str.charCodeAt(i++) & 0xff;
if (c3 == 61) return out;
c3 = base64DecodeChars[c3];
} while(i < len && c3 == -1);
if(c3 == -1) break;
out += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));
do {
c4 = str.charCodeAt(i++) & 0xff;
if(c4 == 61) return out;
c4 = base64DecodeChars[c4];
} while(i < len && c4 == -1);
if(c4 == -1) break;
out += String.fromCharCode(((c3 & 0x03) << 6) | c4);
}
return out;
}
function jiami() {
var str=input.value.replace(/ +$/g,"");
if (str.search(/^thunder|^flashget/i)==-1) {
var thunder="AA"+str+"ZZ";
thunder="thunder://"+base64encode(thunder);
var flashget="[FLASHGET]"+str+"[FLASHGET]";
flashget="flashget://"+base64encode(flashget)+"&abc";
x.innerHTML="迅雷地址：<br><a href="+thunder+">"+thunder+"<\/a><br><br>快车地址：<br><a href="+flashget+">"+flashget+"<\/a>";
}
}
function jiemi() {
var str=input.value.replace(/ +$|\/$/g,"");
if (str.search(/^thunder/i)!=-1) {
str=str.replace("thunder://","");
str=base64decode(str).replace(/^AA|ZZ$/gi,"");
x.innerHTML="原始地址：<br><a href="+str+">"+str+"<\/a>";
}
else if (str.search(/^flashget/i)!=-1) {
str=str.replace("flashget://","");
str=str.replace(/&.*$/,"");
str=base64decode(str).replace(/^\[FLASHGET\]|\[FLASHGET\]$/gi,"");
x.innerHTML="原始地址：<br><a href="+str+">"+str+"<\/a>";
}
else x.innerHTML="地址格式不正确，无法解密。";
}
</script>
</HEAD>
<body>
输入：<br>
<textarea id="input" rows=4 cols=60></textarea><br><br>
<input type=button value=" 加密 " onclick="jiami()"> <input type=button value=" 解密 " onclick="jiemi()">
<br><br>
输出：<br><br>
<div id=x></div>
</body>
</html>
