Fix buffer length for QR code gen. (#5447)

openethereum · Apr 12, 2017 · 1b36a38 · 1b36a38
1 parent a0d8353
commit 1b36a38
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/js/src/ui/QrCode/qrSize.js b/js/src/ui/QrCode/qrSize.js
@@ -69,7 +69,9 @@ const QR_SIZES = [
 export function calculateType (lengthBytes, errorLevel = 'M') {
   let type = 5;
 
-  while (type < 40 && lengthBytes > QR_SIZES[errorLevel][type - 1]) {
+  // subtract 3 from the capacities, since we need 2 bits for the mode and a
+  // bunch more for the length.
+  while (type < 40 && lengthBytes > QR_SIZES[errorLevel][type - 1] - 3) {
     type++;
   }