From ce07a05e41ca203d778a91976784590bde555ebc Mon Sep 17 00:00:00 2001
From: wurst-hans <56444979+wurst-hans@users.noreply.github.com>
Date: Fri, 10 Jan 2025 17:31:05 +0100
Subject: [PATCH] Fixed incompatible PDF/A header bytes
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

When using rand(128, 256), the value 256 can be randomly generated, which results in the hex value “00”. However, this is not compliant with PDF/A-3.
---
 src/ZugferdPdfWriter.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/ZugferdPdfWriter.php b/src/ZugferdPdfWriter.php
index 5c0c0531..d6fa3250 100644
--- a/src/ZugferdPdfWriter.php
+++ b/src/ZugferdPdfWriter.php
@@ -102,7 +102,7 @@ public function setPdfVersion($version = '1.3', $binary_data = false): void
             if ($this->deterministicModeEnabled === true) {
                 $this->PDFVersion .= "\n" . '%' . chr(128) . chr(129) . chr(130) . chr(131);
             } else {
-                $this->PDFVersion .= "\n" . '%' . chr(rand(128, 256)) . chr(rand(128, 256)) . chr(rand(128, 256)) . chr(rand(128, 256));
+                $this->PDFVersion .= "\n" . '%' . chr(rand(128, 255)) . chr(rand(128, 255)) . chr(rand(128, 255)) . chr(rand(128, 255));
             }
         }
     }