blob: 95a2da333a3f3925c08da62b49922a3647798d14 [file] [log] [blame]
#
# Copyright (c) 2020 Project CHIP Authors
# Copyright (c) 2020 Google LLC.
# All rights reserved.
#
# 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
#
# http://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.
#
#
# @file
# This file is utility for Chip
#
from __future__ import absolute_import, print_function
import binascii
from ctypes import c_byte, c_void_p, cast, memmove
class ChipUtility(object):
@staticmethod
def Hexlify(val):
return binascii.hexlify(val).decode()
@staticmethod
def VoidPtrToByteArray(ptr, len):
if ptr:
v = bytearray(len)
memmove((c_byte * len).from_buffer(v), ptr, len)
return v
return None
@staticmethod
def ByteArrayToVoidPtr(array):
if array is not None:
if not (isinstance(array, bytes) or isinstance(array, bytearray)):
raise TypeError("Array must be an str or a bytearray")
return cast((c_byte * len(array)).from_buffer_copy(array), c_void_p)
return c_void_p(0)
@staticmethod
def IsByteArrayAllZeros(array):
for i in array:
if i != 0:
return False
return True
@staticmethod
def ByteArrayToHex(array):
return ChipUtility.Hexlify(bytes(array))
@staticmethod
def CStringToString(s):
return None if s is None else s.decode()
@staticmethod
def StringToCString(s):
return None if s is None else s.encode()
# To support Python 3.8 and older versions, which does not support @classmethod + @property
class classproperty(property):
def __get__(self, cls, owner):
return classmethod(self.fget).__get__(None, owner)()