From f50b4deff7579cc11c2933bec51615e4a34d0401 Mon Sep 17 00:00:00 2001
From: Vincent Vanwaelscappel <vincent@cubedesigners.com>
Date: Mon, 6 Sep 2021 20:09:19 +0200
Subject: [PATCH] wip #4666 @0.5

---
 src/PDF/Document.php | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/PDF/Document.php b/src/PDF/Document.php
index c3ebc57..daecb3a 100644
--- a/src/PDF/Document.php
+++ b/src/PDF/Document.php
@@ -10,6 +10,11 @@ class Document
 {
     protected $in;
 
+    /**
+     * @var string
+     */
+    protected $hash = null;
+
     /**
      * @var int
      */
@@ -29,6 +34,17 @@ class Document
         $this->in = $in;
     }
 
+    /**
+     * @return string
+     */
+    public function getHash(): string
+    {
+        if (null === $this->hash) {
+            $this->hash = hash_file('sha256', $this->in, false);
+        }
+        return $this->hash;
+    }
+
     public function getInfos($force = false)
     {
         if (!$force && $this->pages) {
-- 
2.39.5