From 067393ca2166fa0f6bc0457f41b3c53ad95e9119 Mon Sep 17 00:00:00 2001
From: Natalia Portillo <claunia@claunia.com>
Date: Sun, 28 Apr 2019 14:56:36 +0100
Subject: [PATCH] Optimize reading FAT directories with several thousand files

---
 DiscImageChef.Filesystems/FAT/File.cs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/DiscImageChef.Filesystems/FAT/File.cs b/DiscImageChef.Filesystems/FAT/File.cs
index f85b44aba..c6b86a634 100644
--- a/DiscImageChef.Filesystems/FAT/File.cs
+++ b/DiscImageChef.Filesystems/FAT/File.cs
@@ -221,9 +221,12 @@ namespace DiscImageChef.Filesystems.FAT
 
             string parentPath = string.Join("/", pieces, 0, pieces.Length - 1);
 
-            Errno err = ReadDir(parentPath, out _);
+            if(!directoryCache.TryGetValue(parentPath, out _))
+            {
+                Errno err = ReadDir(parentPath, out _);
 
-            if(err != Errno.NoError) return err;
+                if(err != Errno.NoError) return err;
+            }
 
             Dictionary<string, CompleteDirectoryEntry> parent;