Coverage for /pythoncovmergedfiles/medio/medio/src/python-crc32c/src/google_crc32c/__init__.py: 64%

1# Copyright 2018 Google LLC 

2# 

3# Licensed under the Apache License, Version 2.0 (the "License"); 

4# you may not use this file except in compliance with the License. 

5# You may obtain a copy of the License at 

6# 

7# https://www.apache.org/licenses/LICENSE-2.0 

8# 

9# Unless required by applicable law or agreed to in writing, software 

10# distributed under the License is distributed on an "AS IS" BASIS, 

11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 

12# See the License for the specific language governing permissions and 

13# limitations under the License. 

14 

15import warnings 

16 

17_SLOW_CRC32C_WARNING = ( 

18 "As the c extension couldn't be imported, `google-crc32c` is using a " 

19 "pure python implementation that is significantly slower. If possible, " 

20 "please configure a c build environment and compile the extension" 

21) 

22 

23# Default to C exstension Implementation, falling back to pure python. 

24try: 

25 from google_crc32c import cext as impl 

26 implementation = "c" 

27except ImportError as exc: 

28 from google_crc32c import python as impl # type: ignore 

29 warnings.warn(_SLOW_CRC32C_WARNING, RuntimeWarning) 

30 implementation = "python" 

31 

32extend = impl.extend 

33value = impl.value 

34 

35Checksum = impl.Checksum 

36 

37__all__ = ["extend", "value", "Checksum", "implementation"]