From 13fdb4d7ca31d3d5d954cf6f39eef9d5b5989c51 Mon Sep 17 00:00:00 2001
From: Adam Hathcock <adam@hathcock.uk>
Date: Sat, 14 Feb 2026 10:34:12 +0000
Subject: [PATCH] add better length from master

---
 src/SharpCompress/IO/SharpCompressStream.cs | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/src/SharpCompress/IO/SharpCompressStream.cs b/src/SharpCompress/IO/SharpCompressStream.cs
index b47b7031..a7c09072 100644
--- a/src/SharpCompress/IO/SharpCompressStream.cs
+++ b/src/SharpCompress/IO/SharpCompressStream.cs
@@ -206,8 +206,22 @@ internal partial class SharpCompressStream : Stream, IStreamStack
         throw new NotSupportedException();
     }
 
-    public override long Length =>
-        _isPassthrough ? stream.Length : throw new NotSupportedException();
+    public override long Length
+    {
+        get
+        {
+            if (_isPassthrough)
+            {
+                return stream.Length;
+            }
+
+            if (_ringBuffer is not null)
+            {
+                return _ringBuffer.Length;
+            }
+            throw new NotSupportedException();
+        }
+    }
 
     public override long Position
     {