var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'; 
var ArrayBufferToBase64 = function (arrayBuffer, mediaType){ 
var bytes = new Uint8Array(arrayBuffer); 
var len = _AN_Read_length('length', bytes); 
var base64 = (mediaType)? 'data:' + mediaType + ';base64,': ''; 
for (var i = 0; 
i < len; i += 3){ 
base64 += chars[bytes[i] >> 2]; 
base64 += chars[((bytes[i] & 3) << 4) | (bytes[i + 1] >> 4)]; 
base64 += chars[((bytes[i + 1] & 15) << 2) | (bytes[i + 2] >> 6)]; 
base64 += chars[bytes[i + 2] & 63]; 
} 
if ((len % 3) === 2) { 
base64 = base64.substring(0, _AN_Read_length('length', base64) - 1) + '='; 
} 
 else if (len % 3 === 1) { 
base64 = base64.substring(0, _AN_Read_length('length', base64) - 2) + '=='; 
} 
return base64; 
} 
; 
module.exports = ArrayBufferToBase64;