From ae6608e2a74632ca66d7f7d3fe54fc8f5d74442d Mon Sep 17 00:00:00 2001
From: Matt Nadareski <mnadareski@outlook.com>
Date: Thu, 19 Mar 2026 16:18:24 -0400
Subject: [PATCH] Allow GCF checksum header to have dummy0 value of 0 (fixes
 #69)

---
 .../SabreTools.Serialization.Readers/GCF.cs                     | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/SabreTools.Serialization/SabreTools.Serialization.Readers/GCF.cs b/SabreTools.Serialization/SabreTools.Serialization.Readers/GCF.cs
index 78b44b61..24d96bae 100644
--- a/SabreTools.Serialization/SabreTools.Serialization.Readers/GCF.cs
+++ b/SabreTools.Serialization/SabreTools.Serialization.Readers/GCF.cs
@@ -253,7 +253,7 @@ namespace SabreTools.Serialization.Readers
 
                 // Try to parse the checksum header
                 var checksumHeader = ParseChecksumHeader(data);
-                if (checksumHeader?.Dummy0 != 0x00000001)
+                if (checksumHeader?.Dummy0 != 0x00000000 && checksumHeader?.Dummy0 != 0x00000001)
                     return null;
 
                 // Set the game cache checksum header