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anagaiyahoocom on 07/08/11

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# base 64 decode and encode

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will encode text to base 64 and decode

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`var b64array = "ABCDEFGHIJKLMNOP" +           "QRSTUVWXYZabcdef" +           "ghijklmnopqrstuv" +           "wxyz0123456789+/" +           "="; function encode64(input) {     var base64 = "";    var hex = "";    var chr1, chr2, chr3 = "";    var enc1, enc2, enc3, enc4 = "";    var i = 0;     do {        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;        }         base64  = base64  +            b64array.charAt(enc1) +            b64array.charAt(enc2) +            b64array.charAt(enc3) +            b64array.charAt(enc4);        chr1 = chr2 = chr3 = "";        enc1 = enc2 = enc3 = enc4 = "";    } while (i < input.length);     //console.log(base64 );    return base64;  } function decode64(input) {     var output = "";    var hex = "";    var chr1, chr2, chr3 = "";    var enc1, enc2, enc3, enc4 = "";    var i = 0;     var base64test = /[^A-Za-z0-9\+\/\=]/g;     if (!base64test.exec(input)) {        throw new Error("There were invalid base64 characters in the input text.\n" +              "Valid base64 characters are A-Z, a-z, 0-9, '+', '/',and '='\n" +              "Expect errors in decoding.");    }     //input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");     do {        enc1 = b64array.indexOf(input.charAt(i++));        enc2 = b64array.indexOf(input.charAt(i++));        enc3 = b64array.indexOf(input.charAt(i++));        enc4 = b64array.indexOf(input.charAt(i++));         chr1 = (enc1 << 2) | (enc2 >> 4);        chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);        chr3 = ((enc3 & 3) << 6) | enc4;         output = output + String.fromCharCode(chr1);         if (enc3 != 64) {            output = output + String.fromCharCode(chr2);        }        if (enc4 != 64) {            output = output + String.fromCharCode(chr3);        }         chr1 = chr2 = chr3 = "";        enc1 = enc2 = enc3 = enc4 = "";     } while (i < input.length);     //console.log(unescape(output));    return output; } var inp = '<input type="hidden" name="ac15e53b6df3e8c82f6d8963793c1330" value="1" />'; encode = encode64(inp);console.log(inp);console.log(encode);console.log(decode64(encode)); //Compact decode without invalid character checking and more compact function decode64_mini(input) {    var output = "", hex = "", chr1, chr2, chr3 = "", enc1, enc2, enc3, enc4 = "",i = 0,len=input.length;    do {        enc1 = b64array.indexOf(input.charAt(i++));        enc2 = b64array.indexOf(input.charAt(i++));        enc3 = b64array.indexOf(input.charAt(i++));        enc4 = b64array.indexOf(input.charAt(i++));        chr1 = (enc1 << 2) | (enc2 >> 4);        chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);        chr3 = ((enc3 & 3) << 6) | enc4;        output = output + String.fromCharCode(chr1);        if (enc3 != 64) {output = output + String.fromCharCode(chr2);}        if (enc4 != 64) {output = output + String.fromCharCode(chr3);}        chr1 = chr2 = chr3 = enc1 = enc2 = enc3 = enc4 = "";    } while (i < len);    return output;}`