From 980ae60b914acb0f4458fc2fcc5efb460df69090 Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Fri, 14 Jul 2023 12:52:25 -0400
Subject: [PATCH] Use memoryview to avoid unnecessary copies while splitting
 Extras.

---
 Lib/zipfile/__init__.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Lib/zipfile/__init__.py b/Lib/zipfile/__init__.py
index cd1d7a0669867e..2c963de18e4f95 100644
--- a/Lib/zipfile/__init__.py
+++ b/Lib/zipfile/__init__.py
@@ -209,8 +209,10 @@ def read_one(cls, raw):
 
     @classmethod
     def split(cls, data):
-        while data:
-            extra, data = _Extra.read_one(data)
+        # use memoryview for zero-copy slices
+        rest = memoryview(data)
+        while rest:
+            extra, rest = _Extra.read_one(rest)
             yield extra
 
     @classmethod