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LibPDF: Don't crash on encrypted files with streams with filter arrays

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Makes it possible to render more than 0 pages of CIPA_DC-003-2020_E.pdf
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Nico Weber 2023-07-23 22:46:25 -04:00 committed by Tim Flynn
parent 532230c0e4
commit af5a7b9a51
1 changed files with 4 additions and 2 deletions
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6
Userland/Libraries/LibPDF/Encryption.cpp
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@ -676,8 +676,10 @@ void StandardSecurityHandler::crypt(NonnullRefPtr<Object> object, Reference refe
};
if (stream->dict()->contains(CommonNames::Filter)) {
auto filter = stream->dict()->get_name(m_document, CommonNames::Filter).release_value_but_fixme_should_propagate_errors()->name();
if (filter == "Crypt")
// ISO 32000 (PDF 2.0), 7.4.10 Crypt filter
// "The Crypt filter shall be the first filter in the Filter array entry."
auto filters = m_document->read_filters(stream->dict()).release_value_but_fixme_should_propagate_errors();
if (!filters.is_empty() && filters[0] == "Crypt")
TODO();
}
} else if (object->is<StringObject>()) {