From d57b58849bda868f2463d38cc636f01af919316c Mon Sep 17 00:00:00 2001
From: Shauren <shauren.trinity@gmail.com>
Date: Tue, 5 Sep 2023 00:10:35 +0200
Subject: Dep/CascLib: Update to
 ladislav-zezula/CascLib@5c60050770767f2e606f6fec0c35beb8b9b00c60

---
 dep/CascLib/src/CascOpenFile.cpp | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'dep/CascLib/src/CascOpenFile.cpp')

diff --git a/dep/CascLib/src/CascOpenFile.cpp b/dep/CascLib/src/CascOpenFile.cpp
index eee4566db5d..ac1ddffc5f7 100644
--- a/dep/CascLib/src/CascOpenFile.cpp
+++ b/dep/CascLib/src/CascOpenFile.cpp
@@ -409,6 +409,21 @@ bool WINAPI CascOpenFile(HANDLE hStorage, const void * pvFileName, DWORD dwLocal
             break;
     }
 
+    // Check opening unique file
+    if(dwOpenFlags & CASC_OPEN_CKEY_ONCE)
+    {
+        // Was the file already open since CascOpenStorage?
+        if(pCKeyEntry->Flags & CASC_CE_OPEN_CKEY_ONCE)
+        {
+            SetCascError(ERROR_CKEY_ALREADY_OPENED);
+            return false;
+        }
+        else
+        {
+            pCKeyEntry->Flags |= CASC_CE_OPEN_CKEY_ONCE;
+        }
+    }
+
     // Perform the open operation
     return OpenFileByCKeyEntry(hs, pCKeyEntry, dwOpenFlags, PtrFileHandle);
 }
-- 
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