From 43ada3fcd44b35bdbf8771ec409146848bd158b7 Mon Sep 17 00:00:00 2001
From: Regis Houssin <regis.houssin@inodbox.com>
Date: Mon, 3 Jun 2019 09:36:00 +0200
Subject: [PATCH] FIX better method to check if pdf is protected/encrypted

---
 htdocs/core/lib/pdf.lib.php | 23 +++++++++++++++++------
 1 file changed, 17 insertions(+), 6 deletions(-)

diff --git a/htdocs/core/lib/pdf.lib.php b/htdocs/core/lib/pdf.lib.php
index 14c0435b4ad..1932fca31a2 100644
--- a/htdocs/core/lib/pdf.lib.php
+++ b/htdocs/core/lib/pdf.lib.php
@@ -175,18 +175,29 @@ function pdf_getInstance($format = '', $metric = 'mm', $pagetype = 'P')
 /**
  * Return if pdf file is protected/encrypted
  *
- * @param	TCPDF		$pdf			PDF initialized object
  * @param   string		$pathoffile		Path of file
  * @return  boolean     			    True or false
  */
-function pdf_getEncryption(&$pdf, $pathoffile)
+function pdf_getEncryption($pathoffile)
 {
+	require_once TCPDF_PATH.'tcpdf_parser.php';
+
 	$isencrypted = false;
 
-	$pdfparser = $pdf->_getPdfParser($pathoffile);
-	$data = $pdfparser->getParsedData();
-	if (isset($data[0]['trailer'][1]['/Encrypt'])) {
-		$isencrypted = true;
+	$content = file_get_contents($pathoffile);
+
+	ob_start();
+	@($parser = new \TCPDF_PARSER(ltrim($content)));
+	list($xref, $data) = $parser->getParsedData();
+	unset($parser);
+	ob_end_clean();
+
+	if (isset($xref['trailer']['encrypt'])) {
+		$isencrypted = true;	// Secured pdf file are currently not supported
+	}
+
+	if (empty($data)) {
+		$isencrypted = true;	// Object list not found. Possible secured file
 	}
 
 	return $isencrypted;