mirror of
https://github.com/SystemRage/py-kms.git
synced 2024-11-22 08:15:38 +01:00
105 lines
3.4 KiB
Python
105 lines
3.4 KiB
Python
# Copyright (c) 2009, David Buxton <david@gasmark6.com>
|
|
# All rights reserved.
|
|
#
|
|
# Redistribution and use in source and binary forms, with or without
|
|
# modification, are permitted provided that the following conditions are
|
|
# met:
|
|
#
|
|
# * Redistributions of source code must retain the above copyright
|
|
# notice, this list of conditions and the following disclaimer.
|
|
# * Redistributions in binary form must reproduce the above copyright
|
|
# notice, this list of conditions and the following disclaimer in the
|
|
# documentation and/or other materials provided with the distribution.
|
|
#
|
|
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
|
|
# IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
|
|
# PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
# HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
|
|
# TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
|
# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
|
# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
"""Tools to convert between Python datetime instances and Microsoft times.
|
|
"""
|
|
from datetime import datetime, timedelta, tzinfo
|
|
from calendar import timegm
|
|
|
|
|
|
# http://support.microsoft.com/kb/167296
|
|
# How To Convert a UNIX time_t to a Win32 FILETIME or SYSTEMTIME
|
|
EPOCH_AS_FILETIME = 116444736000000000 # January 1, 1970 as MS file time
|
|
HUNDREDS_OF_NANOSECONDS = 10000000
|
|
|
|
|
|
ZERO = timedelta(0)
|
|
HOUR = timedelta(hours=1)
|
|
|
|
|
|
class UTC(tzinfo):
|
|
"""UTC"""
|
|
def utcoffset(self, dt):
|
|
return ZERO
|
|
|
|
def tzname(self, dt):
|
|
return "UTC"
|
|
|
|
def dst(self, dt):
|
|
return ZERO
|
|
|
|
|
|
utc = UTC()
|
|
|
|
|
|
def dt_to_filetime(dt):
|
|
"""Converts a datetime to Microsoft filetime format. If the object is
|
|
time zone-naive, it is forced to UTC before conversion.
|
|
|
|
>>> "%.0f" % dt_to_filetime(datetime(2009, 7, 25, 23, 0))
|
|
'128930364000000000'
|
|
|
|
>>> "%.0f" % dt_to_filetime(datetime(1970, 1, 1, 0, 0, tzinfo=utc))
|
|
'116444736000000000'
|
|
|
|
>>> "%.0f" % dt_to_filetime(datetime(1970, 1, 1, 0, 0))
|
|
'116444736000000000'
|
|
|
|
>>> dt_to_filetime(datetime(2009, 7, 25, 23, 0, 0, 100))
|
|
128930364000001000
|
|
"""
|
|
if (dt.tzinfo is None) or (dt.tzinfo.utcoffset(dt) is None):
|
|
dt = dt.replace(tzinfo=utc)
|
|
ft = EPOCH_AS_FILETIME + (timegm(dt.timetuple()) * HUNDREDS_OF_NANOSECONDS)
|
|
return ft + (dt.microsecond * 10)
|
|
|
|
|
|
def filetime_to_dt(ft):
|
|
"""Converts a Microsoft filetime number to a Python datetime. The new
|
|
datetime object is time zone-naive but is equivalent to tzinfo=utc.
|
|
|
|
>>> filetime_to_dt(116444736000000000)
|
|
datetime.datetime(1970, 1, 1, 0, 0)
|
|
|
|
>>> filetime_to_dt(128930364000000000)
|
|
datetime.datetime(2009, 7, 25, 23, 0)
|
|
|
|
>>> filetime_to_dt(128930364000001000)
|
|
datetime.datetime(2009, 7, 25, 23, 0, 0, 100)
|
|
"""
|
|
# Get seconds and remainder in terms of Unix epoch
|
|
(s, ns100) = divmod(ft - EPOCH_AS_FILETIME, HUNDREDS_OF_NANOSECONDS)
|
|
# Convert to datetime object
|
|
dt = datetime.utcfromtimestamp(s)
|
|
# Add remainder in as microseconds. Python 3.2 requires an integer
|
|
dt = dt.replace(microsecond=(ns100 // 10))
|
|
return dt
|
|
|
|
|
|
if __name__ == "__main__":
|
|
import doctest
|
|
|
|
doctest.testmod()
|
|
|