Issue #5689: Avoid excessive memory usage by using the default lzma preset.
diff --git a/Lib/tarfile.py b/Lib/tarfile.py
index 5c9d3a8..e3380a2 100644
--- a/Lib/tarfile.py
+++ b/Lib/tarfile.py
@@ -1807,7 +1807,7 @@
return t
@classmethod
- def xzopen(cls, name, mode="r", fileobj=None, preset=9, **kwargs):
+ def xzopen(cls, name, mode="r", fileobj=None, preset=None, **kwargs):
"""Open lzma compressed tar archive name for reading or writing.
Appending is not allowed.
"""
@@ -1819,10 +1819,6 @@
except ImportError:
raise CompressionError("lzma module is not available")
- if mode == "r":
- # LZMAFile complains about a preset argument in read mode.
- preset = None
-
fileobj = lzma.LZMAFile(filename=name if fileobj is None else None,
mode=mode, fileobj=fileobj, preset=preset)