Base64.js

(function(){function Base64(){var base64EncodeChars,_utf8_encode,_utf8_decode;base64EncodeChars="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",_utf8_encode=function(string){var utftext="";var c;string=string.toString().replace(/\r\n/g,"\n");for(var n=0,len=string.length;n<len;n++){c=string.charCodeAt(n);if(c<128){utftext+=String.fromCharCode(c);}else if((c>127)&&(c<2048)){utftext+=String.fromCharCode((c>>6)|192);utftext+=String.fromCharCode((c&63)|128);}else{utftext+=String.fromCharCode((c>>12)|224);utftext+=String.fromCharCode(((c>>6)&63)|128);utftext+=String.fromCharCode((c&63)|128);}}
return utftext;},_utf8_decode=function(utftext){var string="";var i=0,len=utftext.length;var c1=c2=c3=0;while(i<len){c1=utftext.charCodeAt(i++);if(c1<128){string+=String.fromCharCode(c1);}else if((c1>191)&&(c1<224)){c2=utftext.charCodeAt(i++);string+=String.fromCharCode(((c1&31)<<6)|(c2&63));}else{c2=utftext.charCodeAt(i++);c3=utftext.charCodeAt(i++);string+=String.fromCharCode(((c1&15)<<12)|((c2&63)<<6)|(c3&63));}}
return string;};this.encode=function(input){var output="";var chr1,chr2,chr3,enc1,enc2,enc3,enc4;var i=0,len;input=_utf8_encode(input);len=input.length;while(i<len){chr1=input.charCodeAt(i++);chr2=input.charCodeAt(i++);chr3=input.charCodeAt(i++);enc1=chr1>>2;enc2=((chr1&3)<<4)|(chr2>>4);enc3=((chr2&15)<<2)|(chr3>>6);enc4=chr3&63;if(isNaN(chr2)){enc3=enc4=64;}else if(isNaN(chr3)){enc4=64;}
output+=base64EncodeChars.charAt(enc1)+base64EncodeChars.charAt(enc2)+base64EncodeChars.charAt(enc3)+base64EncodeChars.charAt(enc4);}
return output;};this.decode=function(input){var output="";var chr1,chr2,chr3;var enc1,enc2,enc3,enc4;var i=0;input=input.replace(/[^A-Za-z0-9\+\/\=]/g,"");while(i<input.length){enc1=base64EncodeChars.indexOf(input.charAt(i++));enc2=base64EncodeChars.indexOf(input.charAt(i++));enc3=base64EncodeChars.indexOf(input.charAt(i++));enc4=base64EncodeChars.indexOf(input.charAt(i++));chr1=(enc1<<2)|(enc2>>4);chr2=((enc2&15)<<4)|(enc3>>2);chr3=((enc3&3)<<6)|enc4;output+=String.fromCharCode(chr1);if(enc3!=64)output+=String.fromCharCode(chr2);if(enc4!=64)output+=String.fromCharCode(chr3);}
return _utf8_decode(output);};}
window.Base64=new Base64;})();