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Add Type 3 tests for ExtGState and Form XObject font uses

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Dylan M. Taylor committed 2026-10-26 15:40:59 -04:00
1 parent 534cee79a6
commit b87295af60
1 file changed
+41
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crates/redact/src/tests/surviving_references.rs
+41
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@@ -257,3 +257,44 @@ fn unparseable_type3_font_encoding_fails_closed() {
let res = apply(&mut doc, None);
assert!(res.is_err(), "redaction must fail closed when Type 3 cleanup cannot be established: {res:?}");
}
/// A Type 3 font selected through an ExtGState /Font entry is a use of the font for pruning:
/// its redacted glyph program does not survive a full save (F-011).
#[test]
fn type3_font_set_through_extgstate_has_its_redacted_glyph_removed() {
let mut doc = pdf(vec![
b"<< /Type /Catalog /Pages 2 0 R >>".to_vec(),
b"<< /Type /Pages /Kids [3 0 R] /Count 1 >>".to_vec(),
b"<< /Type /Page /Parent 2 0 R /MediaBox [0 0 300 300] /Contents 4 0 R /Resources 5 0 R >>".to_vec(),
stream("", b"/GS1 gs BT 10 100 Td (A) Tj ET"),
b"<< /Font << /T3 6 0 R >> /ExtGState << /GS1 8 0 R >> >>".to_vec(),
b"<< /Type /Font /Subtype /Type3 /FontBBox [0 -200 1000 800] /FontMatrix [0.001 0 0 0.001 0 0] /FirstChar 65 /LastChar 65 /Widths [500] /Encoding << /Differences [65 /A] >> /CharProcs << /A 7 0 R >> >>".to_vec(),
stream("", b"% SECRET_EXTGSTATE_GLYPH_PAYLOAD"),
b"<< /Type /ExtGState /Font [6 0 R 10] >>".to_vec(),
]);
mark(&mut doc, 0, &[[9.0, 95.0, 16.0, 110.0]], "");
let report = apply(&mut doc, None).unwrap();
assert_eq!(report.glyphs, 1);
assert!(!full_save_holds(&doc, b"SECRET_EXTGSTATE_GLYPH_PAYLOAD"), "redacted glyph program survived");
}
/// A Type 3 font used only inside a Form XObject is found by the scan and its redacted glyph
/// program does not survive a full save (F-011).
#[test]
fn type3_font_used_in_a_form_xobject_has_its_redacted_glyph_removed() {
let mut doc = pdf(vec![
b"<< /Type /Catalog /Pages 2 0 R >>".to_vec(),
b"<< /Type /Pages /Kids [3 0 R] /Count 1 >>".to_vec(),
b"<< /Type /Page /Parent 2 0 R /MediaBox [0 0 300 300] /Contents 4 0 R /Resources 5 0 R >>".to_vec(),
stream("", b"/Fm Do"),
b"<< /XObject << /Fm 8 0 R >> >>".to_vec(),
b"<< /Type /Font /Subtype /Type3 /FontBBox [0 -200 1000 800] /FontMatrix [0.001 0 0 0.001 0 0] /FirstChar 65 /LastChar 65 /Widths [500] /Encoding << /Differences [65 /A] >> /CharProcs << /A 7 0 R >> >>".to_vec(),
stream("", b"% SECRET_FORM_GLYPH_PAYLOAD"),
stream("/Type /XObject /Subtype /Form /BBox [0 0 300 300] /Resources 9 0 R", b"BT /T3 10 Tf 10 100 Td (A) Tj ET"),
b"<< /Font << /T3 6 0 R >> >>".to_vec(),
]);
mark(&mut doc, 0, &[[9.0, 95.0, 16.0, 110.0]], "");
let report = apply(&mut doc, None).unwrap();
assert_eq!(report.glyphs, 1);
assert!(!full_save_holds(&doc, b"SECRET_FORM_GLYPH_PAYLOAD"), "redacted glyph program survived");
}