gh-89668: Optimize ZipFile file header processing algorithm to avoid unneeded IO...

diff --git a/Lib/zipfile.py b/Lib/zipfile.py
index dc02011084329a7f72cca34269ed4844da756755..9f4437526c91f0a3e9b1aceb9e5722288f00643a 100644 (file)
--- a/Lib/zipfile.py
+++ b/Lib/zipfile.py
@@ -1564,7 +1564,7 @@ class ZipFile:
 
             fname = zef_file.read(fheader[_FH_FILENAME_LENGTH])
             if fheader[_FH_EXTRA_FIELD_LENGTH]:
-                zef_file.read(fheader[_FH_EXTRA_FIELD_LENGTH])
+                zef_file.seek(fheader[_FH_EXTRA_FIELD_LENGTH], whence=1)
 
             if zinfo.flag_bits & _MASK_COMPRESSED_PATCH:
                 # Zip 2.7: compressed patched data