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bpo-26253: Add compressionlevel to tarfile stream #2962

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Merged
merged 5 commits into from
Jun 25, 2022
Merged

bpo-26253: Add compressionlevel to tarfile stream #2962

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89fa205
bpo-26253: Add compressionlevel to tarfile stream
jarondl Jul 31, 2017
31b9835
bpo-26253: don't add compresslevel as an attribute
jarondl Jul 31, 2017
c217360
bpo-26253: tarfile: add compresslevel unit tests
jarondl Aug 1, 2017
f48acbd
Apply suggestions from code review
serhiy-storchaka Jun 17, 2022
2b1b417
Update Misc/NEWS.d/next/Library/2017-07-31-13-35-28.bpo-26253.8v_sCs.rst
serhiy-storchaka Jun 17, 2022
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bpo-26253: don't add compresslevel as an attribute 
In tarfile, compresslevel will be simply passed around.

Also added 'versionadded' to stream compression level setting
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@jarondl
jarondl committed May 8, 2022
commit 31b9835c2018d691c773902b2eba7856ed53f50c
3 changes: 3 additions & 0 deletions Doc/library/tarfile.rst
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Expand Up @@ -152,6 +152,9 @@ Some facts and figures:
.. versionchanged:: 3.6
The *name* parameter accepts a :term:`path-like object`.

.. versionchanged:: 3.7
The *compresslevel* keyword argument also works for streams.


.. class:: TarFile
:noindex:
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25 changes: 12 additions & 13 deletions Lib/tarfile.py
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Expand Up @@ -337,7 +337,7 @@ class _Stream:
"""

def __init__(self, name, mode, comptype, fileobj, bufsize,
compresslevel=9):
compresslevel):
"""Construct a _Stream object.
"""
self._extfileobj = True
Expand All @@ -351,15 +351,14 @@ def __init__(self, name, mode, comptype, fileobj, bufsize,
fileobj = _StreamProxy(fileobj)
comptype = fileobj.getcomptype()

self.name = name or ""
self.mode = mode
self.name = name or ""
self.mode = mode
self.comptype = comptype
self.fileobj = fileobj
self.bufsize = bufsize
self.compresslevel = compresslevel
self.buf = b""
self.pos = 0
self.closed = False
self.fileobj = fileobj
self.bufsize = bufsize
self.buf = b""
self.pos = 0
self.closed = False

try:
if comptype == "gz":
Expand All @@ -373,7 +372,7 @@ def __init__(self, name, mode, comptype, fileobj, bufsize,
self._init_read_gz()
self.exception = zlib.error
else:
self._init_write_gz()
self._init_write_gz(compresslevel)

elif comptype == "bz2":
try:
Expand All @@ -385,7 +384,7 @@ def __init__(self, name, mode, comptype, fileobj, bufsize,
self.cmp = bz2.BZ2Decompressor()
self.exception = OSError
else:
self.cmp = bz2.BZ2Compressor(self.compresslevel)
self.cmp = bz2.BZ2Compressor(compresslevel)

elif comptype == "xz":
try:
Expand All @@ -412,10 +411,10 @@ def __del__(self):
if hasattr(self, "closed") and not self.closed:
self.close()

def _init_write_gz(self):
def _init_write_gz(self, compresslevel):
"""Initialize for writing with gzip compression.
"""
self.cmp = self.zlib.compressobj(self.compresslevel,
self.cmp = self.zlib.compressobj(compresslevel,
self.zlib.DEFLATED,
-self.zlib.MAX_WBITS,
self.zlib.DEF_MEM_LEVEL,
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