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# Copyright 2009-2017 Wander Lairson Costa
# Copyright 2009-2021 PyUSB contributors
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# 2. 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.
#
# 3. Neither the name of the copyright holder nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# 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.
# All the hacks necessary to assure compatibility across all
# supported versions come here.
# Please, note that there is one version check for each
# hack we need to do, this makes maintenance easier... ^^
import sys
import array
__all__ = ['_reduce', '_set', '_next', '_update_wrapper']
# we support Python >= 2.4
assert sys.hexversion >= 0x020400f0
# On Python 3, reduce became a functools module function
try:
import functools
_reduce = functools.reduce
except (ImportError, AttributeError):
_reduce = reduce
# all, introduced in Python 2.5
try:
_all = all
except NameError:
_all = lambda iter_ : _reduce( lambda x, y: x and y, iter_, True )
# we only have the builtin set type since 2.5 version
try:
_set = set
except NameError:
import sets
_set = sets.Set
# On Python >= 2.6, we have the builtin next() function
# On Python 2.5 and before, we have to call the iterator method next()
def _next(iter):
try:
return next(iter)
except NameError:
return iter.next()
# functools appeared in 2.5
try:
import functools
_update_wrapper = functools.update_wrapper
except (ImportError, AttributeError):
def _update_wrapper(wrapper, wrapped):
wrapper.__name__ = wrapped.__name__
wrapper.__module__ = wrapped.__module__
wrapper.__doc__ = wrapped.__doc__
wrapper.__dict__ = wrapped.__dict__
# this is used (as of May 2015) twice in core, once in backend/openusb, and in
# some unit test code. It would probably be clearer if written in terms of some
# definite 3.2+ API (bytearrays?) with a fallback provided for 2.4+.
def as_array(data=None):
if data is None:
return array.array('B')
if isinstance(data, array.array):
return data
try:
return array.array('B', data)
except TypeError:
# When you pass a unicode string or a character sequence,
# you get a TypeError if the first parameter does not match
a = array.array('B')
a.frombytes(data.encode('utf-8'))
return a
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