From 944e634afe6301d77fa2e36437df2873df9429f9 Mon Sep 17 00:00:00 2001
From: Oleg Iarygin <oleg@arhadthedev.net>
Date: Wed, 10 May 2023 07:36:47 +0400
Subject: [PATCH] Change the first-attempt zipfile encoding to cp437

---
 Lib/zipfile/__init__.py                                         | 2 +-
 .../next/Library/2023-05-10-07-34-47.gh-issue-84353.T4P5Ls.rst  | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)
 create mode 100644 Misc/NEWS.d/next/Library/2023-05-10-07-34-47.gh-issue-84353.T4P5Ls.rst

diff --git a/Lib/zipfile/__init__.py b/Lib/zipfile/__init__.py
index 95c047991f872b..5750d39b791b32 100644
--- a/Lib/zipfile/__init__.py
+++ b/Lib/zipfile/__init__.py
@@ -487,7 +487,7 @@ def FileHeader(self, zip64=None):
 
     def _encodeFilenameFlags(self):
         try:
-            return self.filename.encode('ascii'), self.flag_bits
+            return self.filename.encode('cp437'), self.flag_bits
         except UnicodeEncodeError:
             return self.filename.encode('utf-8'), self.flag_bits | _MASK_UTF_FILENAME
 
diff --git a/Misc/NEWS.d/next/Library/2023-05-10-07-34-47.gh-issue-84353.T4P5Ls.rst b/Misc/NEWS.d/next/Library/2023-05-10-07-34-47.gh-issue-84353.T4P5Ls.rst
new file mode 100644
index 00000000000000..fe5d5675c9c85d
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2023-05-10-07-34-47.gh-issue-84353.T4P5Ls.rst
@@ -0,0 +1,2 @@
+:mod:`zipfile` now knows that old zip files were saved in cp437 (OEM-US),
+not in ASCII.