diff --git a/src/SharpCompress/Compressors/Rar/UnpackInline.cs b/src/SharpCompress/Compressors/Rar/UnpackInline.cs
new file mode 100644
index 00000000..fd9bd623
--- /dev/null
+++ b/src/SharpCompress/Compressors/Rar/UnpackInline.cs
@@ -0,0 +1,36 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SharpCompress.Compressors.Rar
+{
+    internal partial class Unpack
+    {
+        uint SlotToLength(uint Slot)
+        {
+          //uint LBits,Length=2;
+          int LBits;
+          uint Length=2;
+          if (Slot<8)
+          {
+            LBits=0;
+            Length+=Slot;
+          }
+          else
+          {
+            //LBits=Slot/4-1;
+            LBits=(int)(Slot/4-1);
+            Length+=(4 | (Slot & 3)) << LBits;
+          }
+
+          if (LBits>0)
+          {
+            Length+=getbits()>>(16-LBits);
+            AddBits(LBits);
+          }
+          return Length;
+        }
+    }
+}