FA-79567 / Barcode symbology encoding / Member archive

Codabar start and stop characters are sized like digits · case 02

Every symbol is two wide elements shorter than printed, so the layout clips the stop character.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

Validate and size a Codabar symbol text with a wide:narrow ratio between 2 and 3 inclusive. The first and last characters must be start/stop letters A-D (uppercase only, at least two characters); body characters are 0-9 - $ : / . +. Each character has 7 elements: digits, "-" and "$" have 2 wide elements, ": / . +" and A-D have 3. One narrow gap separates adjacent characters. Return the total width in narrow modules or an error.

Why this case matters

Retail, logistics, pharmacy and document workflows depend on encoders that produce exactly the module pattern, code-set switches, separators and quiet zones scanners expect; one misplaced module or separator makes a label unreadable or, worse, scan as different data.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression: start and stop wide count 0	`{"modules": 19}`	`{"modules": 21}`	Failed

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