FA-79322 / Image orientation metadata / Member archive

Invalid sidecar orientation blocks the embedded fallback · case 02

A sidecar with orientation 0 or text garbage overrides a valid embedded tag.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

A photo manager reconciles the embedded orientation with an XMP sidecar. Values are valid if they are integers 1..8 or strings that are exactly one digit 1..8 after trimming. Policy "sidecar" prefers the sidecar, "embedded" prefers the file, and "newest" (also used for unknown policies) prefers the sidecar when both are valid and sidecar_mtime >= file_mtime; the other valid value is the fallback, then 1.

Why this case matters

Camera, phone and scanner images carry an orientation hint separately from the stored pixels; galleries, thumbnailers, editors and upload pipelines must interpret it consistently or photos appear sideways, mirrored or doubly rotated.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression: sidecar value validation 0	`"06"`	`1`	Failed

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