var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'; 
var lookup = new Uint8Array(256); 
for (var i = 0; 
i < _AN_Read_length('length', chars); i++ ){ 
lookup[chars.charCodeAt(i)] = i; 
} 
var Base64ToArrayBuffer = function (base64){ 
base64 = base64.substr(base64.indexOf(',') + 1); 
var len = _AN_Read_length('length', base64); 
var bufferLength = len * 0.75; 
var p = 0; 
var encoded1; 
var encoded2; 
var encoded3; 
var encoded4; 
if (base64[len - 1] === '=') { 
bufferLength-- ; 
if (base64[len - 2] === '=') { 
bufferLength-- ; 
} 
} 
var arrayBuffer = new ArrayBuffer(bufferLength); 
var bytes = new Uint8Array(arrayBuffer); 
for (var i = 0; 
i < len; i += 4){ 
encoded1 = lookup[base64.charCodeAt(i)]; 
encoded2 = lookup[base64.charCodeAt(i + 1)]; 
encoded3 = lookup[base64.charCodeAt(i + 2)]; 
encoded4 = lookup[base64.charCodeAt(i + 3)]; 
bytes[p++ ] = (encoded1 << 2) | (encoded2 >> 4); 
bytes[p++ ] = ((encoded2 & 15) << 4) | (encoded3 >> 2); 
bytes[p++ ] = ((encoded3 & 3) << 6) | (encoded4 & 63); 
} 
return arrayBuffer; 
} 
; 
module.exports = Base64ToArrayBuffer;