Bugfix - Type resolve missing for nested pages in structure

[denikod]

I found a bug in the code when working with PDF files that have a complex nested page structure.

Screenshot of an example structure

On the left is a complex structure that causes an error
On the right is a normal one

Which caused the following error:
Fatal error: Uncaught exception 'setasign\Fpdi\PdfParser\Type\PdfTypeException' with message 'Array value expected.'

The proposed commit fixes this bug.

[JanSlabon]

Great catch and I really wonder why this issue was not triggered before. Can you share the PDF in question? There's already a test document for a name tree:

FPDI/tests/functional/PdfReader/PdfReaderTest.php

Line 524 in 9e013b3

$path . '/10000_with-tree.pdf',

...but yours seems to be structured differently.

[denikod]

Can you share the PDF in question?

Hello,
Sorry for delay with response...
I cannot provide the exact document that caused the issue, but after some manipulations, I created an identical document with the same problem.
I have attached the problematic document here:
PDF-complex-structure.pdf

Example of PHP code causing an error

<?php

use setasign\Fpdi\Fpdi;

require_once('fpdf/fpdf.php');
require_once('fpdi/src/autoload.php');

class Pdf {

	function generatePreview($file)
	{
		$pdf = new FPDI();
		
		$pdf_handle = fopen($file, 'rb');
		$pageCount = $pdf->setSourceFile($pdf_handle);

		$max = min(5, $pageCount);

		for ($i=1; $i <= $max; $i++)
		{
			//  Add page to the document
			$templateID = $pdf->importPage($i);

			$pdf->addPage();
			$pdf->useTemplate($templateID);
		}

		$pdf_content = $pdf->Output('S');

		header("Content-type:application/pdf");
		echo $pdf_content;

		fclose($pdf_handle);

		return;
	}
}

$pdf = new Pdf();
$pdf->generatePreview("PDF-complex-structure.pdf");

I hope I've contributed to the growth of this wonderful library! 😊
🎄 Merry Christmas!