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google_crc32c_build.py
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google_crc32c_build.py
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# Copyright 2018 Google LLC
#
# 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.
import os
import cffi
def get_kwargs():
install_prefix = os.environ.get("CRC32C_INSTALL_PREFIX")
if install_prefix is None:
return {}
install_prefix = os.path.realpath(install_prefix)
library_dirs = [os.path.join(install_prefix, "lib")]
if os.name == "nt":
library_dirs.append(os.path.join(install_prefix, "bin"))
rpath = os.pathsep.join(library_dirs)
if os.name == "nt":
extra_link_args = ["-Wl,-rpath={}".format(rpath)]
elif os.name == "posix" or os.name == "darwin": # darwin reports this.
extra_link_args = ["-Wl,-rpath,{}".format(rpath)]
else:
extra_link_args = ["-Wl,-rpath={}".format(rpath)]
return {
"library_dirs": library_dirs,
"include_dirs": [os.path.join(install_prefix, "include")],
"extra_link_args": extra_link_args,
}
_HEADER = """\
uint32_t crc32c_extend(uint32_t crc, const uint8_t* data, size_t count);
uint32_t crc32c_value(const uint8_t* data, size_t count);
"""
FFIBUILDER = cffi.FFI()
FFIBUILDER.cdef(_HEADER)
FFIBUILDER.set_source(
"google_crc32c._crc32c_cffi",
'#include "crc32c/crc32c.h"',
libraries=["crc32c"],
**get_kwargs()
)
if __name__ == "__main__":
FFIBUILDER.compile(verbose=True)