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wang-bin/base64_buffer

Created November 6, 2013 07:36
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js base64 to ArrayBuffer
Raw
base64_buffer
decode64: function decodeBase64(en) {
var de = new Uint8Array(en.length); //3/4
var u = 0, q = '', x = '', c;
var map64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
for (var r=0; c=en[x++]; ~c&&(u=q%4?u*64+c:c,q++%4)?de[r++]=(255&u>>(-2*q&6)):0)
c = map64.indexOf(c);
var sub = de.subarray||de.subset||de.slice;
return sub.call(de, 0, r);
},
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