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import sys
PY3 = sys.version_info[0] >= 3
try:
from itertools import izip
xrange = xrange # @UndefinedVariable
except ImportError:
# py3
izip = zip
xrange = range
# end handle python version
try:
# Python 2
buffer = buffer # @UndefinedVariable
memoryview = buffer # @ReservedAssignment
# Assume no memory view ...
def to_bytes(i):
return i
except NameError:
# Python 3 has no `buffer`; only `memoryview`
# However, it's faster to just slice the object directly, maybe it keeps a view internally
def buffer(obj, offset, size=None):
if size is None:
# return memoryview(obj)[offset:]
return obj[offset:]
else:
# return memoryview(obj)[offset:offset+size]
return obj[offset:offset + size]
# end buffer reimplementation
# smmap can return memory view objects, which can't be compared as buffers/bytes can ...
def to_bytes(i):
if isinstance(i, memoryview):
return i.tobytes()
return i
memoryview = memoryview # @ReservedAssignment
try:
MAXSIZE = sys.maxint # @UndefinedVariable
except AttributeError:
MAXSIZE = sys.maxsize
try:
from contextlib import ExitStack
except ImportError:
from contextlib2 import ExitStack # @UnusedImport
try:
from struct import unpack_from # @UnusedImport
except ImportError:
from struct import unpack, calcsize
__calcsize_cache = dict()
def unpack_from(fmt, data, offset=0):
try:
size = __calcsize_cache[fmt]
except KeyError:
size = calcsize(fmt)
__calcsize_cache[fmt] = size
# END exception handling
return unpack(fmt, data[offset: offset + size])
# END own unpack_from implementation
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