From c5471937c9c6c79cc932d52c235fac3e4a26a9ae Mon Sep 17 00:00:00 2001
From: erikn69 <erikn_69@hotmail.com>
Date: Tue, 30 Dec 2025 12:57:12 -0500
Subject: [PATCH] Implement XRefStm handling in PDFUtilFnc

Added handling for XRefStm in PDF trailer processing.
---
 src/PDFUtilFnc.php | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/PDFUtilFnc.php b/src/PDFUtilFnc.php
index 4f3148b..0f18714 100644
--- a/src/PDFUtilFnc.php
+++ b/src/PDFUtilFnc.php
@@ -347,6 +347,16 @@ public static function get_xref_1_4(&$_buffer, $xref_pos, $depth = null) {
 
         // Get the trailer object
         $trailer_obj = PDFUtilFnc::get_trailer($_buffer, $trailer_pos);
+        if (isset($trailer_obj['XRefStm'])) {
+            $xrefstm_pos = $trailer_obj['XRefStm']->get_int();
+            [ $xrefstm_table ] = PDFUtilFnc::get_xref_1_5($_buffer, $xrefstm_pos, $depth);
+
+            foreach ($xrefstm_table as $oid => $val) {
+                if (!isset($xref_table[$oid])) {
+                    $xref_table[$oid] = $val;
+                }
+            }
+        }
 
         // If there exists a previous xref (for incremental PDFs), get it and merge the objects that do not exist in the current xref table
         if (isset($trailer_obj['Prev'])) {