63 lines
2.0 KiB
Cython
63 lines
2.0 KiB
Cython
# Copyright 2013-2016 DataStax, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""
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Duplicate module of util.py, with some accelerated functions
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used for deserialization.
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"""
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from libc.math cimport modf, round, fabs
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from cpython.datetime cimport (
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timedelta_new,
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# cdef inline object timedelta_new(int days, int seconds, int useconds)
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# Create timedelta object using DateTime CAPI factory function.
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# Note, there are no range checks for any of the arguments.
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import_datetime,
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# Datetime C API initialization function.
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# You have to call it before any usage of DateTime CAPI functions.
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)
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import datetime
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import sys
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cdef bint is_little_endian
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from cassandra.util import is_little_endian
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import_datetime()
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DEF DAY_IN_SECONDS = 86400
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DATETIME_EPOC = datetime.datetime(1970, 1, 1)
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cdef datetime_from_timestamp(double timestamp):
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cdef int days = <int> (timestamp / DAY_IN_SECONDS)
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cdef int64_t days_in_seconds = (<int64_t> days) * DAY_IN_SECONDS
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cdef int seconds = <int> (timestamp - days_in_seconds)
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cdef double tmp
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cdef double micros_left = modf(timestamp, &tmp) * 1000000.
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micros_left = modf(micros_left, &tmp)
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cdef int microseconds = <int> tmp
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# rounding to emulate fp math in delta_new
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cdef int x_odd
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tmp = round(micros_left)
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if fabs(tmp - micros_left) == 0.5:
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x_odd = microseconds & 1
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tmp = 2.0 * round((micros_left + x_odd) * 0.5) - x_odd
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microseconds += <int>tmp
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return DATETIME_EPOC + timedelta_new(days, seconds, microseconds)
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