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Current File : /usr/lib/python2.7/site-packages/rsa/_compat.py

# -*- coding: utf-8 -*-
#
#  Copyright 2011 Sybren A. Stüvel <sybren@stuvel.eu>
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      https://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.

"""Python compatibility wrappers."""

from __future__ import absolute_import

import sys
from struct import pack

try:
    MAX_INT = sys.maxsize
except AttributeError:
    MAX_INT = sys.maxint

MAX_INT64 = (1 << 63) - 1
MAX_INT32 = (1 << 31) - 1
MAX_INT16 = (1 << 15) - 1

# Determine the word size of the processor.
if MAX_INT == MAX_INT64:
    # 64-bit processor.
    MACHINE_WORD_SIZE = 64
elif MAX_INT == MAX_INT32:
    # 32-bit processor.
    MACHINE_WORD_SIZE = 32
else:
    # Else we just assume 64-bit processor keeping up with modern times.
    MACHINE_WORD_SIZE = 64

try:
    # < Python3
    unicode_type = unicode
except NameError:
    # Python3.
    unicode_type = str

# Fake byte literals.
if str is unicode_type:
    def byte_literal(s):
        return s.encode('latin1')
else:
    def byte_literal(s):
        return s

# ``long`` is no more. Do type detection using this instead.
try:
    integer_types = (int, long)
except NameError:
    integer_types = (int,)

b = byte_literal

# To avoid calling b() multiple times in tight loops.
ZERO_BYTE = b('\x00')
EMPTY_BYTE = b('')


def is_bytes(obj):
    """
    Determines whether the given value is a byte string.

    :param obj:
        The value to test.
    :returns:
        ``True`` if ``value`` is a byte string; ``False`` otherwise.
    """
    return isinstance(obj, bytes)


def is_integer(obj):
    """
    Determines whether the given value is an integer.

    :param obj:
        The value to test.
    :returns:
        ``True`` if ``value`` is an integer; ``False`` otherwise.
    """
    return isinstance(obj, integer_types)


def byte(num):
    """
    Converts a number between 0 and 255 (both inclusive) to a base-256 (byte)
    representation.

    Use it as a replacement for ``chr`` where you are expecting a byte
    because this will work on all current versions of Python::

    :param num:
        An unsigned integer between 0 and 255 (both inclusive).
    :returns:
        A single byte.
    """
    return pack("B", num)


def get_word_alignment(num, force_arch=64,
                       _machine_word_size=MACHINE_WORD_SIZE):
    """
    Returns alignment details for the given number based on the platform
    Python is running on.

    :param num:
        Unsigned integral number.
    :param force_arch:
        If you don't want to use 64-bit unsigned chunks, set this to
        anything other than 64. 32-bit chunks will be preferred then.
        Default 64 will be used when on a 64-bit machine.
    :param _machine_word_size:
        (Internal) The machine word size used for alignment.
    :returns:
        4-tuple::

            (word_bits, word_bytes,
             max_uint, packing_format_type)
    """
    max_uint64 = 0xffffffffffffffff
    max_uint32 = 0xffffffff
    max_uint16 = 0xffff
    max_uint8 = 0xff

    if force_arch == 64 and _machine_word_size >= 64 and num > max_uint32:
        # 64-bit unsigned integer.
        return 64, 8, max_uint64, "Q"
    elif num > max_uint16:
        # 32-bit unsigned integer
        return 32, 4, max_uint32, "L"
    elif num > max_uint8:
        # 16-bit unsigned integer.
        return 16, 2, max_uint16, "H"
    else:
        # 8-bit unsigned integer.
        return 8, 1, max_uint8, "B"

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