From ad5be4f533c78b805a6b49ad3bfeb93980baf1a6 Mon Sep 17 00:00:00 2001
From: Jeremy Powell <jeremy@visionaid.com>
Date: Thu, 21 Nov 2024 12:52:41 +1300
Subject: [PATCH] Add file access overload to RootStorage.Open

---
 OpenMcdf.Tests/RootStorageTests.cs | 1 +
 OpenMcdf/RootStorage.cs            | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/OpenMcdf.Tests/RootStorageTests.cs b/OpenMcdf.Tests/RootStorageTests.cs
index a118a20..54600b4 100644
--- a/OpenMcdf.Tests/RootStorageTests.cs
+++ b/OpenMcdf.Tests/RootStorageTests.cs
@@ -12,6 +12,7 @@ public void Open(string fileName)
         using var rootStorage2 = RootStorage.OpenRead(fileName);
 
         Assert.ThrowsException<IOException>(() => RootStorage.Open(fileName, FileMode.Open));
+        Assert.ThrowsException<IOException>(() => RootStorage.Open(fileName, FileMode.Open, FileAccess.ReadWrite));
         Assert.ThrowsException<IOException>(() => RootStorage.OpenWrite(fileName));
     }
 
diff --git a/OpenMcdf/RootStorage.cs b/OpenMcdf/RootStorage.cs
index 8c7dd5d..651a088 100644
--- a/OpenMcdf/RootStorage.cs
+++ b/OpenMcdf/RootStorage.cs
@@ -70,6 +70,14 @@ public static RootStorage Open(string fileName, FileMode mode, StorageModeFlags
         return Open(stream, flags);
     }
 
+    public static RootStorage Open(string fileName, FileMode mode, FileAccess access, StorageModeFlags flags = StorageModeFlags.None)
+    {
+        ThrowIfLeaveOpen(flags);
+
+        FileStream stream = File.Open(fileName, mode, access);
+        return Open(stream, flags);
+    }
+
     public static RootStorage Open(Stream stream, StorageModeFlags flags = StorageModeFlags.None)
     {
         stream.ThrowIfNotSeekable();