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Fix buffer length for QR code gen. #5447

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Apr 12, 2017
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Fix buffer length for QR code gen. #5447

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4 changes: 3 additions & 1 deletion js/src/ui/QrCode/qrSize.js
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Original file line number Diff line number Diff line change
Expand Up @@ -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++;
}

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