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

2017-04-12 13:20:22 +02:00 · 2017-04-12 13:20:22 +02:00 · 1b36a381e8
parent a0d83537e5
commit 1b36a381e8
1 changed files with 3 additions and 1 deletions
--- 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++;
  }