JavaScript-ID3-Reader/src/base64.js at master · grender/JavaScript-ID3-Reader · GitHub

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// Modified version of http://www.webtoolkit.info/javascript-base64.html

(function(ns) {

ns.Base64 = {

// private property

_keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",

// public method for encoding

encodeBytes : function (input) {

var output = "";

var chr1, chr2, chr3, enc1, enc2, enc3, enc4;

var i = 0;

while (i < input.length) {

chr1 = input[i++];

chr2 = input[i++];

chr3 = input[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 = output +

Base64._keyStr.charAt(enc1) + Base64._keyStr.charAt(enc2) +

Base64._keyStr.charAt(enc3) + Base64._keyStr.charAt(enc4);

}

return output;

}

};

// Export functions for closure compiler

ns["Base64"] = ns.Base64;

ns.Base64["encodeBytes"] = ns.Base64.encodeBytes;

})(this);

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