Oops, apparently repo version is different than npm version

lib/b64.js

@@ -4,34 +4,40 @@
 	var lookup = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
 
 	function b64ToByteArray(b64) {
-		var i, l, tmp, hasPadding, arr = [];
-
-		if (i % 4 > 0) {
+		var i, j, l, tmp, placeHolders, arr;
+	
+		if (b64.length % 4 > 0) {
 			throw 'Invalid string. Length must be a multiple of 4';
 		}
 
-		hasPadding = /=$/.test(b64);
+		// the number of equal signs (place holders)
+		// if there are two placeholders, than the two characters before it
+		// represent one byte
+		// if there is only one, then the three characters before it represent 2 bytes
+		// this is just a cheap hack to not do indexOf twice
+		placeHolders = b64.indexOf('=');
+		placeHolders = placeHolders > 0 ? b64.length - placeHolders : 0;
+
+		// base64 is 4/3 + up to two characters of the original data
+		arr = [];//new Uint8Array(b64.length * 3 / 4 - placeHolders);
 
-		l = hasPadding ? b64.length - 4: b64.length;
+		// if there are placeholders, only get up to the last complete 4 chars
+		l = placeHolders > 0 ? b64.length - 4 : b64.length;
 
-		for (i = 0; i < l; i += 4) {
+		for (i = 0, j = 0; i < l; i += 4, j += 3) {
 			tmp = (lookup.indexOf(b64[i]) << 18) | (lookup.indexOf(b64[i + 1]) << 12) | (lookup.indexOf(b64[i + 2]) << 6) | lookup.indexOf(b64[i + 3]);
 			arr.push((tmp & 0xFF0000) >> 16);
 			arr.push((tmp & 0xFF00) >> 8);
 			arr.push(tmp & 0xFF);
 		}
 
-		if (hasPadding) {
-			b64 = b64.substring(i, b64.indexOf('='));
-
-			if (b64.length === 2) {
-				tmp = (lookup.indexOf(b64[0]) << 2) | (lookup.indexOf(b64[1]) >> 4);
-				arr.push(tmp & 0xFF);
-			} else {
-				tmp = (lookup.indexOf(b64[0]) << 10) | (lookup.indexOf(b64[1]) << 4) | (lookup.indexOf(b64[2]) >> 2);
-				arr.push((tmp >> 8) & 0xFF);
-				arr.push(tmp & 0xFF);
-			}
+		if (placeHolders === 2) {
+			tmp = (lookup.indexOf(b64[i]) << 2) | (lookup.indexOf(b64[i + 1]) >> 4);
+			arr.push(tmp & 0xFF);
+		} else if (placeHolders === 1) {
+			tmp = (lookup.indexOf(b64[i]) << 10) | (lookup.indexOf(b64[i + 1]) << 4) | (lookup.indexOf(b64[i + 2]) >> 2);
+			arr.push((tmp >> 8) & 0xFF);
+			arr.push(tmp & 0xFF);
 		}
 
 		return arr;

package.json

@@ -2,7 +2,7 @@
 	"author": "T. Jameson Little <t.jameson.little@gmail.com>",
 	"name": "base64-js",
 	"description": "Base64 encoding/decoding in pure JS",
-	"version": "0.0.3",
+	"version": "0.0.4",
 	"repository": {
 		"type": "git",
 		"url": "git://github.com/beatgammit/base64-js.git"