UPC-A scans add an extra leading zero to the result

[that1crzywhtguy]

Scanning a UPC-A barcode now returns 13 characters instead of 12, with an extra zero prepended to the result. This is a recent regression—it used to return the correct 12-digit value.

[markusfisch]

Hi, here is the reason for this change (in ZXingC++, the barcode reading library BinaryEye is using):

zxing-cpp/zxing-cpp@c4f5647

[that1crzywhtguy]

So this functionality is broken due to this library? Bummer. 😔 😢

No fix?

[markusfisch]

Well, it was introduced deliberately for standards conformance:

EAN/UPC: return 13-digit numbers for UPC-A/E as required by standard
The old behavior was inherited from the Java code base but clearly in
violation of the ISO specification. See also the discussion here:
zxing-cpp/zxing-cpp#883 (comment)