Binary/independent mode

[eoreshnikov]

Problem:
Given: a barcode contains binary data.
After reading the code, the data is incorrectly converted into a string for "card id"
Based on the string, a new barcode is recreated, which contains incorrect data.

For example, the Electronic Compulsory Health Insurance Policy of the Russian Federation is in PDF417 format and contains binary data.

Suggested solution:
Add an option, when selected, the barcode is stored as it was scanned (or the photo is simply set), and the “card id” field must be specified manually by the user.

[TheLastProject]

The "card id" field shouldn't show anything except the value.

Is this a duplicate of #1496?

[eoreshnikov]

Is this a duplicate of #1496?

This is a related and similar problem.
But #1496 suggests updating the ZXing library.

I believe that the problem can be solved differently.

Current chain: Source barcode -> Scanning -> Receiving binary array -> Converting binary array to string to display card-id (this is where data corruption occurs) -> creating a new barcode to display.
As a result, the original barcode does not match the new one.

For example (russian) , the binary array in a barcode consists of:

code_type + card_id + First name, Last name (in non-standard 6-bit encoding) + others.

It will not be possible to display this in the card-id field.

BUT! You can allow the user to simply write the card number in the card-id field, and use a photo of the original barcode instead of the barcode.

[TheLastProject]

Do you have an example barcode/qr code and card-id value this happens to?

BUT! You can allow the user to simply write the card number in the card-id field, and use a photo of the original barcode instead of the barcode.

You could set the barcode type to none and use an image as front photo but of course it'd be much better if this was fixed.

[eoreshnikov]

Do you have an example barcode/qr code and card-id value this happens to?

My barcode contains personal information and therefore I do not want to publish it here. I also can’t generate test code, since it’s not the simplest algorithm.

[matmai]

Still an issue with v2.33.0

Binary data that cannot be converted to a readable string is not converted into a barcode that represents the same data as the scanned barcode. (Independant of the barcode type)

Possible solution: Take the scanned barcode data as it is and directly create a new barcode, without converting the data to a string first.

[Laqco]

Can confirm in 2.34.1.

An AZTEC barcode, that contains HEX-code 0A (linefeed), is not stored correctly, probably due to string conversion.

Possible solution: Store the HEX-digits instead of the actual data.

[TheLastProject]

Can any of you supply an affected barcode image so a test can and fix could be written for this?

[matmai]

Here an example QR code with 5 characters "S\t\n\0E" or 0x53 0x09 0x0A 0x00 0x45:

[TheLastProject]

I guess the correct way to deal with this is to turn the card ID field into a binary field and add a new field for encoding (would need testing to see if zxing exposed the encoding). Then the follow up question becomes: what to do with the card edit screen of the code is not plain text?

If we're doing database change it may be a good moment to do a "major migration" and swap card ID and barcode value around too, making the "card ID" the setting for what you want displayed (instead of what is stored in the barcode), so we can also fix #1453 and make that consistent.

Will be a painful database migration I guess, but not an impossible one.

[Mannshoch]

Any Updste on this?
I have the same Problem wit a ticket I get from a certain event. These not work anymore if I import them in Catima.

[TheLastProject]

Without enough details it's hard to know if your issue is this issue. It may very well be the lack of UTF-8 support for which #2716, which is intended as fix for #2555, may fix the issue.