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bpo-32713: Fix tarfile.itn for large/negative float values. (GH-5434) 

(cherry picked from commit 72d9b2be36)

Co-authored-by: Joffrey F <f.joffrey@gmail.com>
This commit is contained in:
Miss Islington (bot) 2018-02-26 17:11:01 -08:00 committed by GitHub
parent ec5569b08e
commit 3f6c172b70
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3 changed files with 11 additions and 1 deletions
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3
Lib/tarfile.py
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@ -202,8 +202,9 @@ def itn(n, digits=8, format=DEFAULT_FORMAT):
# base-256 representation. This allows values up to (256**(digits-1))-1.
# A 0o200 byte indicates a positive number, a 0o377 byte a negative
# number.
n = int(n)
if 0 <= n < 8 ** (digits - 1):
s = bytes("%0*o" % (digits - 1, int(n)), "ascii") + NUL
s = bytes("%0*o" % (digits - 1, n), "ascii") + NUL
elif format == GNU_FORMAT and -256 ** (digits - 1) <= n < 256 ** (digits - 1):
if n >= 0:
s = bytearray([0o200])

8
Lib/test/test_tarfile.py
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@ -2146,6 +2146,14 @@ class MiscTest(unittest.TestCase):
self.assertEqual(tarfile.itn(-0x100000000000000),
b"\xff\x00\x00\x00\x00\x00\x00\x00")
# Issue 32713: Test if itn() supports float values outside the
# non-GNU format range
self.assertEqual(tarfile.itn(-100.0, format=tarfile.GNU_FORMAT),
b"\xff\xff\xff\xff\xff\xff\xff\x9c")
self.assertEqual(tarfile.itn(8 ** 12 + 0.0, format=tarfile.GNU_FORMAT),
b"\x80\x00\x00\x10\x00\x00\x00\x00")
self.assertEqual(tarfile.nti(tarfile.itn(-0.1, format=tarfile.GNU_FORMAT)), 0)
def test_number_field_limits(self):
with self.assertRaises(ValueError):
tarfile.itn(-1, 8, tarfile.USTAR_FORMAT)

1
Misc/NEWS.d/next/Library/2018-02-26-13-16-36.bpo-32713.55yegW.rst Normal file
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@ -0,0 +1 @@
Fixed tarfile.itn handling of out-of-bounds float values. Patch by Joffrey Fuhrer.