Stop padding inputs already divisible by 4

Neuman Vong · Neuman Vong · commit 6fc8c26b54eb · 2011-04-27T17:16:15.000-07:00
diff --git a/JWT.php b/JWT.php
@@ -127,8 +127,11 @@ public static function jsonEncode($input)
      */
     public static function urlsafeB64Decode($input)
     {
-        $padlen = 4 - strlen($input) % 4;
-        $input .= str_repeat('=', $padlen);
+        $remainder = strlen($input) % 4;
+        if ($remainder) {
+            $padlen = 4 - $remainder;
+            $input .= str_repeat('=', $padlen);
+        }
         return base64_decode(strtr($input, '-_', '+/'));
     }
 

Original file line number	Diff line number	Diff line change
`@@ -127,8 +127,11 @@ public static function jsonEncode($input)`
`127`	`127`	`*/`
`128`	`128`	`public static function urlsafeB64Decode($input)`
`129`	`129`	`{`
`130`		`- $padlen = 4 - strlen($input) % 4;`
`131`		`- $input .= str_repeat('=', $padlen);`
	`130`	`+ $remainder = strlen($input) % 4;`
	`131`	`+ if ($remainder) {`
	`132`	`+ $padlen = 4 - $remainder;`
	`133`	`+ $input .= str_repeat('=', $padlen);`
	`134`	`+ }`
`132`	`135`	`return base64_decode(strtr($input, '-_', '+/'));`
`133`	`136`	`}`
`134`	`137`