FA-79629 / Barcode symbology encoding / Member archive

Empty variable field swallows the following separator · case 04

A blank batch number followed by GS is parsed as a batch containing the next field.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Parse scanner output of a GS1-128 symbol: it must start with the symbology identifier "]C1"; FNC1 separators arrive as GS (0x1D) and redundant separators are skipped. AIs are recognised by the shortest matching prefix among the predefined fixed-length AIs (00:18, 01/02:14, 11/13/15/17:6, 3103:6) and variable AIs (10/21 max 20, 30/37 max 8, 400 max 30). A fixed field must be complete and contain no GS; a variable field runs to the next GS or the end and must have 1..max characters. Return [[ai, value], ...] 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: variable field terminator search 0	`[["3103", "823622"], ["37", "54346471"], ["10", "X-B/C"], ["10", "\u001d"]]`	`{"ai": "10", "error": "length"}`	Failed

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