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

Import the tarfile changes from commit:

    commit 72d9b2be36f091793ae7ffc5ad751f040c6e6ad3
    Author: Joffrey F <f.joffrey@gmail.com>
    Date:   Mon Feb 26 16:02:21 2018 -0800

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

which add a safeguard against the type level volatility of
os.stat_result which will return a float instead of an int if e.
g. st_mtime becomes negative due to the timezone.

diff --git a/deltatar/tarfile.py b/deltatar/tarfile.py
index 8fc47d6..6deff35 100644 (file)
--- a/deltatar/tarfile.py
+++ b/deltatar/tarfile.py
@@ -278,8 +278,9 @@ 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])