FA-79499 / Barcode symbology encoding / Member archive

Add-on gap is added on top of the main right quiet zone · case 04

Symbols with add-ons are wider than the allowed label area.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Input {sym, modules, x_um, addon?}. Quiet zones in X: ean13 11 left / 7 right, upca 9/9, ean8 7/7, code128, code39 and itf14 10/10. Allowed X-dimensions in micrometres: EAN/UPC 264..660 inclusive, code128/code39 >= 190, itf14 >= 495. An EAN-2 (20 modules) or EAN-5 (47 modules) add-on is only allowed on EAN/UPC; it replaces the right quiet zone by a 7-module gap, the add-on and a 5-module trailing quiet zone. Return [total_um, left_quiet_um] or unknown/x-out-of-range/bad-addon.

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: gap replacing the main right quiet zone 0	`[38280, 2904]`	`[36432, 2904]`	Failed

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