From 02572bb5801506b75b3aabb52e0c4e20c1804a2f Mon Sep 17 00:00:00 2001
From: Chris Markiewicz <effigies@gmail.com>
Date: Wed, 23 Aug 2023 10:27:01 -0400
Subject: [PATCH] FIX: Hack around 3.12rc1 bug (python/cpython#108111)

---
 nibabel/openers.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/nibabel/openers.py b/nibabel/openers.py
index 90c7774d1..9a024680a 100644
--- a/nibabel/openers.py
+++ b/nibabel/openers.py
@@ -78,6 +78,12 @@ def __init__(
             mtime=mtime,
         )
 
+    def seek(self, pos: int, whence: int = 0, /) -> int:
+        # Work around bug (gh-180111) in Python 3.12rc1, where seeking without
+        # flushing can cause write of excess null bytes
+        self.flush()
+        return super().seek(pos, whence)
+
 
 def _gzip_open(
     filename: str,