From 26cce3805fcea8254e45adda30e379444064701e Mon Sep 17 00:00:00 2001
From: Christoph Massmann <c.massmann@vianetz.com>
Date: Sat, 19 Dec 2020 11:19:31 +0100
Subject: [PATCH] page count is now injected via placeholder as described in
 https://github.com/dompdf/dompdf/issues/1636

Signed-off-by: Christoph Massmann <c.massmann@vianetz.com>
---
 src/Model/Generator/Dompdf.php | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/src/Model/Generator/Dompdf.php b/src/Model/Generator/Dompdf.php
index b837b8b..a39ae02 100644
--- a/src/Model/Generator/Dompdf.php
+++ b/src/Model/Generator/Dompdf.php
@@ -31,6 +31,8 @@
  */
 final class Dompdf extends AbstractGenerator
 {
+    const TOTAL_PAGE_COUNT_PLACEHOLDER = '__PDF_TPC__';
+
     /**
      * @var \Dompdf\Dompdf
      */
@@ -51,6 +53,8 @@ public function renderPdfDocument(DocumentInterface $documentModel)
         $this->domPdf->loadHtml($this->getHtmlContentsForDocument($documentModel));
         $this->domPdf->render();
 
+        $this->injectPageCount();
+
         return $this->domPdf->output();
     }
 
@@ -106,4 +110,19 @@ private function getDompdfOptions()
             'chroot' => $this->config->getChrootDir(),
         );
     }
+
+    /**
+     * @return void
+     */
+    private function injectPageCount()
+    {
+        $canvas = $this->domPdf->getCanvas();
+        $pdf = $canvas->get_cpdf();
+
+        foreach ($pdf->objects as &$o) {
+            if ($o['t'] === 'contents') {
+                $o['c'] = str_replace(self::TOTAL_PAGE_COUNT_PLACEHOLDER, $canvas->get_page_count(), $o['c']);
+            }
+        }
+    }
 }