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doc_audit_redactions and `pdfcraft-cli audit` returned rectangles in PDF user space (origin at the bottom-left of the media box), while comment_list, doc_info, text_lines and the redaction tools give points from the top-left of the page as displayed. The same mark read [144.14, 91.2, 265.95, 102.2] in comment_list and [144.138, 739.8, 265.952, 750.8] in the audit. Both surfaces now convert with the helper doc_info uses (view_rect, made public for the CLI), so they report the same rectangles, after /Rotate. The CLI reads the page geometry only when there is a finding to place. AuditFinding::rect stays in user space; the audit README says which space each surface uses. Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com> Co-authored-by: OpenAI Codex <noreply@openai.com> Co-authored-by: Brandon Thomas <echelon@gmail.com>
41 lines
2.1 KiB
Markdown
41 lines
2.1 KiB
Markdown
# pdfcraft-audit
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Layer L4 (may use `edit`): verification tooling, the faux-redaction audit.
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```rust
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let findings: Vec<Finding> = audit_redactions(&doc)?; // page, kind, rect, covered_text
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```
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It reports two kinds of finding:
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- **faux redaction**: an opaque filled rectangle painted *after* text it overlaps, dark enough
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against the text's colour (WCAG contrast below 3) to hide it, while the text is still
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extractable underneath;
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- **unapplied mark**: a Redact annotation that was marked but never applied.
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A properly applied redaction removes the text, so it never flags. Page backgrounds, table
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shading and highlights don't either: they're painted before the text, or light against it.
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A rectangle covers a text line when it hides at least 40% of the area of the words the line
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draws, or at least 40% of the line's box together with a positive-area intersection with one
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of its words. The gap an applied redaction leaves (a `TJ` adjustment where the text was) is in the line's box but
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holds no word, so a redaction box over it alone does not count.
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Limits, by design and documented rather than hidden:
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- only filled rectangles count as covers, drawn with `re` or as a single `m`/`l` subpath whose
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corners form an axis-aligned rectangle (not other paths, shadings or patterns), and a
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translucent one (`/ca` below 1) is not flagged;
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- covers inside form XObjects are found, but only text drawn directly in the page content is
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checked under them;
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- annotation rectangles are compared in unrotated user space, so `/Rotate` pages may misalign;
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- a cover that hides less than 40% of a line's box and less than 40% of its words (a short
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value in the middle of a long line) is not flagged.
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It fails closed: an undecodable content stream, malformed `/Annots`, form XObjects nested deeper
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than 32 or in a cycle, or a walk past the operator bound is an error, never "no findings".
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Surfaces: the `doc_audit_redactions` automation tool and `pdfcraft-cli audit`. Both report each
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rectangle in points from the top-left of the page as displayed (y down, after `/Rotate`), like
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the other tools; `AuditFinding::rect` itself stays in PDF user space.
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