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from ctypes import *
from collections import defaultdict
import pathlib
import platform
_lib_prefixes = defaultdict(lambda: "lib", {
"windows": "",
})
_lib_suffixes = defaultdict(lambda: ".so", {
"windows": ".dll",
"darwin": ".dylib",
})
_os = platform.system().lower()
_libname = "eduvpn_common"
_libfile = f"{_lib_prefixes[_os]}{_libname}{_lib_suffixes[_os]}"
# Library should have been copied to the lib/ folder
lib = cdll.LoadLibrary(str(pathlib.Path(__file__).parent / "lib" / _libfile))
VPNStateChange = CFUNCTYPE(None, c_char_p, c_char_p, c_char_p)
# Exposed functions
lib.Register.argtypes, lib.Register.restype = [c_char_p, VPNStateChange], None
# We have to use c_void_p instead of c_char_p to free it properly
# See https://stackoverflow.com/questions/13445568/python-ctypes-how-to-free-memory-getting-invalid-pointer-error
lib.FreeString.argtypes, lib.FreeString.restype = [c_void_p], None
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