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mtlcl410andClaude Opus 5.5 424459f386 fix(audit): find rectangle covers closed with h or painted with b/b* (#1817 ) (#1865 )

The redaction audit turned an re rectangle into an unknown path on a
redundant h, and its fill branch left out the close-fill-stroke operators b
and b*, so those opaque covers over extractable text produced no finding.
Keep a closed rectangle closed under h and treat b/b* like the other fills.


Claude-Session: https://claude.ai/code/session_01RUNQSPVXx3dDBabRZHAnjz

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

2026-10-15 02:27:23 -04:00

src

fix(audit): find rectangle covers closed with h or painted with b/b* (#1817 ) (#1865 )

2026-10-15 02:27:23 -04:00

Cargo.toml

Add faux-redaction audit (paint-order and colour-aware, fail-closed) (#110 )

2026-10-11 14:32:33 -04:00

README.md

fix(audit): a rectangle drawn as an m/l path is a cover like re (#1521 )

2026-10-13 00:07:15 -04:00

README.md

pdfcraft-audit

Layer L4 (may use edit): verification tooling, the faux-redaction audit.

let findings: Vec<Finding> = audit_redactions(&doc)?;  // page, kind, rect, covered_text

It reports two kinds of finding:

faux redaction: an opaque filled rectangle painted after text it overlaps, dark enough against the text's colour (WCAG contrast below 3) to hide it, while the text is still extractable underneath;
unapplied mark: a Redact annotation that was marked but never applied.

A properly applied redaction removes the text, so it never flags. Page backgrounds, table shading and highlights don't either: they're painted before the text, or light against it.

Limits, by design and documented rather than hidden:

only filled rectangles count as covers, drawn with re or as a single m/l subpath whose corners form an axis-aligned rectangle (not other paths, shadings or patterns), and a translucent one (/ca below 1) is not flagged;
covers inside form XObjects are found, but only text drawn directly in the page content is checked under them;
annotation rectangles are compared in unrotated user space, so /Rotate pages may misalign.

It fails closed: an undecodable content stream, malformed /Annots, form XObjects nested deeper than 32 or in a cycle, or a walk past the operator bound is an error, never "no findings".

Surfaces: the redact_audit automation tool and pdfcraft-cli.