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LibPDF: Make encrypted object streams work

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There were two problems:
1. parse_compressed_object_with_index() parses indirect objects
   without going through Parser::parse_indirect_value(), so
   push_reference() / pop_reference() weren't called.
   Manually call them, both for the indirect object containing
   the object stream and for the indirect object within the
   object stream.
2. The indirect object within the object stream got decrypted
   twice: Once when the object stream data itself got decrypted,
   and then incorrectly a second time when the object data within
   the stream was read. To fix, disable encryption while parsing
   object stream data (since it's already decrypted).

The test is from http://opf-labs.org/format-corpus/pdfCabinetOfHorrors/
which according to readme.md at the same location is CC0.
This commit is contained in:
Nico Weber 2023-07-11 12:02:16 -04:00 • committed by Linus Groh
parent 6200097bcc
commit 323d76fbb9
5 changed files with 31 additions and 2 deletions
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12
Tests/LibPDF/TestPDF.cpp
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@ -61,3 +61,15 @@ TEST_CASE(encrypted_with_aes)
EXPECT_EQ(MUST(info_dict.title()).value(), "sup");
EXPECT_EQ(MUST(info_dict.creator()).value(), "TextEdit");
}
TEST_CASE(encrypted_object_stream)
{
auto file = MUST(Core::MappedFile::map("encryption_nocopy.pdf"sv));
auto document = MUST(PDF::Document::create(file->bytes()));
MUST(document->initialize());
EXPECT_EQ(document->get_page_count(), 1U);
auto info_dict = MUST(document->info_dict()).value();
EXPECT_EQ(MUST(info_dict.author()).value(), "van der Knijff");
EXPECT_EQ(MUST(info_dict.creator()).value(), "Acrobat PDFMaker 9.1 voor Word");
}