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| author | Ross Lagerwall <rosslagerwall@gmail.com> | 2012-05-17 19:49:27 +0200 |
|---|---|---|
| committer | Ross Lagerwall <rosslagerwall@gmail.com> | 2012-05-17 19:49:27 +0200 |
| commit | 468ff4c3ed07b815898a749eca14e9ae1ea76893 (patch) | |
| tree | 98995406703a6675bc8b95d012c8f26b9fde7946 /Lib/tarfile.py | |
| parent | 6c6d3a2f9f031fdf8b12a9f9dbeb178e081b8dbc (diff) | |
| download | cpython-git-468ff4c3ed07b815898a749eca14e9ae1ea76893.tar.gz | |
Issue #13031: Small speed-up for tarfile when unzipping tarfiles.
Patch by Justin Peel.
Diffstat (limited to 'Lib/tarfile.py')
| -rw-r--r-- | Lib/tarfile.py | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/Lib/tarfile.py b/Lib/tarfile.py index 9d38421ef6..854967751d 100644 --- a/Lib/tarfile.py +++ b/Lib/tarfile.py @@ -245,8 +245,8 @@ def calc_chksums(buf): the high bit set. So we calculate two checksums, unsigned and signed. """ - unsigned_chksum = 256 + sum(struct.unpack("148B", buf[:148]) + struct.unpack("356B", buf[156:512])) - signed_chksum = 256 + sum(struct.unpack("148b", buf[:148]) + struct.unpack("356b", buf[156:512])) + unsigned_chksum = 256 + sum(struct.unpack_from("148B8x356B", buf)) + signed_chksum = 256 + sum(struct.unpack_from("148b8x356b", buf)) return unsigned_chksum, signed_chksum def copyfileobj(src, dst, length=None): |