[Bug]: $nrOfBytes must be greater than 0, -324 given

[horstoeko]

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

$pdfParser = new PdfParser();
$pdfParsed = $pdfParser->parseString($pdfContent);
$fileSpecs = $pdfParsed->getCatalog()->getFileSpecifications();

$fileSpecs = array_filter(
    $fileSpecs,
    static function ($fileSpec) {
        return !is_null($fileSpec->getEmbeddedFile());
    }
);

foreach ($fileSpecs as $fileSpec) {
    $this->attachmentList[] = new Attachment(
        $fileSpec->getEmbeddedFile()->getStream()->toString(),
        $fileSpec->getFileSpecificationString(),
        ltrim($fileSpec->getEmbeddedFile()->getSubType() ?? '', '/')
    );
}

The error occurs when calling "$fileSpec->getEmbeddedFile()->getStream()->toString(),"

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

pdf_zf_en16931_2.pdf

/home/user/vendor/prinsfrank/pdfparser/src/Stream/InMemoryStream.php:26
/home/user/vendor/prinsfrank/pdfparser/src/Document/Object/Item/CompressedObject/CompressedObjectContent/CompressedObjectContentParser.php:27
/home/user/vendor/prinsfrank/pdfparser/src/Document/Object/Item/UncompressedObject/UncompressedObject.php:89
/home/user/vendor/prinsfrank/pdfparser/src/Document/Object/Decorator/DecoratedObject.php:33

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]

Sorry for the late reply, I was on holiday for a bit. I have found the issue here, the parser currently doesn't handle nested object markers properly, where a PDF object contains a bunch of other PDF objects. I'll keep you updated on a fix!

[PrinsFrank]

I wrote a naive implementation for backward marker search from the next byte offset for objects, but that doesn't work on incrementally updated PDFs. I'll look at a more thorough implementation over the next few days, I'll keep you updated about a proper fix!

Do you see this issue in multiple embedded PDFs or is this a bug that only occurs with some files?

[horstoeko]

Hi @PrinsFrank

Thank you very much for your support. It's not that urgent – enjoy the Christmas holidays.

Do you see this issue in multiple embedded PDFs or is this a bug that only occurs with some files?

I will indeed need to check that. At the moment, I have only come across this one PDF. I have not yet looked at the other sample PDFs from the official ZUGFeRD/Factur-X documentation.

Kind regards and happy Christmas

[niranjanbai]

I occasionally notice this issue occurring on our server as well.

$nrOfBytes must be greater than 0, 0 given

Any update on fixing this issue?