From 66cb455b99c613b66192ed708f558179f913fe3c Mon Sep 17 00:00:00 2001
From: Natalia Portillo <claunia@claunia.com>
Date: Sat, 4 Jan 2025 02:59:11 +0000
Subject: [PATCH] [ISO9660] Fixed performance issue caused by reading the whole
 data previous to the asked offset.

---
 Aaru.Filesystems/ISO9660/File.cs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Aaru.Filesystems/ISO9660/File.cs b/Aaru.Filesystems/ISO9660/File.cs
index b750612ff..aec7a66af 100644
--- a/Aaru.Filesystems/ISO9660/File.cs
+++ b/Aaru.Filesystems/ISO9660/File.cs
@@ -485,7 +485,7 @@ ErrorNumber ReadWithExtents(long offset,     long size, List<(uint extent, uint
                                 byte fileNumber, out byte[] buffer)
     {
         var  ms             = new MemoryStream();
-        long currentFilePos = 0;
+        long currentFilePos = offset;
 
         for(var i = 0; i < extents.Count; i++)
         {
@@ -496,8 +496,8 @@ ErrorNumber ReadWithExtents(long offset,     long size, List<(uint extent, uint
                 continue;
             }
 
-            long leftExtentSize      = extents[i].size;
-            uint currentExtentSector = 0;
+            var  currentExtentSector = (uint)(offset / 2048);
+            long leftExtentSize      = extents[i].size - currentFilePos;
 
             while(leftExtentSize > 0)
             {