Feature: Recovery of corrupt crossReferenceStream

[Fneufneu]

Is there an existing issue for this?

• I have searched the existing issues and found no similar reports

Are you using the latest version of this package?

• The issue I'm reporting exists in the latest release

Can other PDF readers read the file?

• The PDF I'm trying to read opens correctly in at least one other PDF reader

When running this snippet

$document = (new PdfParser())->parseFile('pdf_notparsed_vo37ajbgtlsm7Ytckwh.pdf');
$document->getText();

I run into the following issue/exception (Please attach the pdf)

Uncaught PrinsFrank\PdfParser\Exception\ParseFailureException: Expected "5 0 obj" on first line, got "4 0 obj" in ~/pdfparser/vendor/prinsfrank/pdfparser/src/Document/Object/Item/UncompressedObject/UncompressedObjectParser.php:19
Stack trace:
#0 ~/pdfparser/vendor/prinsfrank/pdfparser/src/Document/Document.php(118): PrinsFrank\PdfParser\Document\Object\Item\UncompressedObject\UncompressedObjectParser::parseObject(Object(PrinsFrank\PdfParser\Document\CrossReference\Source\Section\SubSection\Entry\CrossReferenceEntryInUseObject), 5, Object(PrinsFrank\PdfParser\Stream\InMemoryStream))
#1 ~/pdfparser/vendor/prinsfrank/pdfparser/src/Document/Document.php(63): PrinsFrank\PdfParser\Document\Document->getObject(5, 'PrinsFrank\\PdfP...')
#2 ~/pdfparser/vendor/prinsfrank/pdfparser/src/Document/Document.php(139): PrinsFrank\PdfParser\Document\Document->getCatalog()
#3 ~/pdfparser/vendor/prinsfrank/pdfparser/src/Document/Document.php(150): PrinsFrank\PdfParser\Document\Document->getPages()
#4 ~/pdfparser/extract.php(15): PrinsFrank\PdfParser\Document\Document->getText()
#5 {main}
  thrown in ~/pdfparser/vendor/prinsfrank/pdfparser/src/Document/Object/Item/UncompressedObject/UncompressedObjectParser.php on line 19

[pdf_notparsed_vo37ajbgtlsm7Ytckwh.pdf](https://github.com/user-attachments/files/21368622/pdf_notparsed_vo37ajbgtlsm7Ytckwh.pdf)

Do you allow attachment files to be used in tests to prevent regressions?

• Yes, I give permission to use this file as a test file to prevent future regressions (And am authorized to give this permission)

[PrinsFrank]

Do you have an example file for this one? This looks like a corrupt crossReferenceSection.

[PrinsFrank]

@Fneufneu This also looks like this went wrong during upload: I can see the filename in the codeblock, but directly accessing the url doesn't work. Can you try to attach it again?

[Fneufneu]

here:

pdf_notparsed_vo37ajbgtlsm7Ytckwh.pdf

[PrinsFrank]

This PDF is corrupt, the crossReferenceStream indicates that object with number 5 should be at a position where we find object 4.

The reason some other readers can read this file is because they implement a fallback mechanism where they just scan the entire document for all documents. This can be implemented in this scenario, but does slow down parsing significantly. I'll work on this in the future.