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Diffstat (limited to 'rsa/machine_size.py')
-rw-r--r-- | rsa/machine_size.py | 74 |
1 files changed, 0 insertions, 74 deletions
diff --git a/rsa/machine_size.py b/rsa/machine_size.py deleted file mode 100644 index 2a871b8..0000000 --- a/rsa/machine_size.py +++ /dev/null @@ -1,74 +0,0 @@ -# -*- 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. - -"""Detection of 32-bit and 64-bit machines and byte alignment.""" - -import sys - -MAX_INT = sys.maxsize -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 - - -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" |