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_compat.py
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# 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 struct import pack def byte(num: int) -> bytes: """ Converts a number between 0 and 255 (both inclusive) to a base-256 (byte) representation. :param num: An unsigned integer between 0 and 255 (both inclusive). :returns: A single byte. """ return pack("B", num) def xor_bytes(b1: bytes, b2: bytes) -> bytes: """ Returns the bitwise XOR result between two bytes objects, b1 ^ b2. Bitwise XOR operation is commutative, so order of parameters doesn't generate different results. If parameters have different length, extra length of the largest one is ignored. :param b1: First bytes object. :param b2: Second bytes object. :returns: Bytes object, result of XOR operation. """ return bytes(x ^ y for x, y in zip(b1, b2))