Add support for CNK codes

[thibaultmol]

In Belgium pretty much all products sold in pharmacies use a CNK code which is a specific MSI coded barcode:
https://www.apb.be/SiteCollectionDocuments/ALL%20PARTNERS%20ACCESS%20DOC/CODES-CNK-DOC/BROCHURE-CNK-EN.pdf

see example:

Most of them use this CNK code. Others (that have unique codes for getting money back from health insurance have datamatrix codes which already work properly) and a smaller number of products use regular EAN codes which also work.

[markusfisch]

Thank you for bringing this up! I've never seen these barcodes, unfortunately. Very interesting! And sorry for the slow response 🙈

Now, this barcode format would have to be added to ZXingCpp (that's the library this app uses to read barcodes). @axxel Do you know CNK codes?

[axxel]

No, I haven't seen these before. The link to the PDF seems broken. @thibaultmol can you double check that?

[thibaultmol]

XD timing. They (APB) literally changed to a new website TODAY xd amazing

https://web.archive.org/web/20240808102218/https://www.apb.be/SiteCollectionDocuments/ALL%20PARTNERS%20ACCESS%20DOC/CODES-CNK-DOC/BROCHURE-CNK-EN.pdf

[axxel]

I see. They use "just" a fixed length MSI code. That symbology is pretty simple in its construction. I guess this could be implemented along the lines of the existing Code39 reader.

That said, I don't have spare time to put into this right now. But if there is a business interest (money involved), my priorities can be influenced :). In that case, please get in touch via zxingcpp at gmail dot com.