/usr/lib/python2.7/dist-packages/imposm/util/lib.py is in python-imposm 2.6.0+ds-4.
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# Copyright (C) 2010 Omniscale <http://omniscale.de>
#
# 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.
"""
ctypes utilities.
"""
import sys
import os
from ctypes import CDLL
from ctypes.util import find_library as _find_library
default_locations = dict(
darwin=dict(
paths = ['/opt/local/lib'],
exts = ['.dylib'],
),
win32=dict(
paths = [os.path.dirname(os.__file__) + '/../../../DLLs'],
exts = ['.dll']
),
other=dict(
paths = [], # MAPPROXY_LIB_PATH will add paths here
exts = ['.so']
),
)
# TODO does this work for imposm too?
additional_lib_path = os.environ.get('MAPPROXY_LIB_PATH')
if additional_lib_path:
additional_lib_path = additional_lib_path.split(os.pathsep)
additional_lib_path.reverse()
for locs in default_locations.values():
for path in additional_lib_path:
locs['paths'].insert(0, path)
def load_library(lib_names, locations_conf=default_locations):
"""
Load the `lib_name` library with ctypes.
If ctypes.util.find_library does not find the library,
different path and filename extensions will be tried.
Retruns the loaded library or None.
"""
if isinstance(lib_names, basestring):
lib_names = [lib_names]
for lib_name in lib_names:
lib = load_library_(lib_name, locations_conf)
if lib is not None: return lib
def load_library_(lib_name, locations_conf=default_locations):
lib_path = find_library(lib_name)
if lib_path:
return CDLL(lib_path)
if sys.platform in locations_conf:
paths = locations_conf[sys.platform]['paths']
exts = locations_conf[sys.platform]['exts']
lib_path = find_library(lib_name, paths, exts)
else:
paths = locations_conf['other']['paths']
exts = locations_conf['other']['exts']
lib_path = find_library(lib_name, paths, exts)
if lib_path:
return CDLL(lib_path)
def find_library(lib_name, paths=None, exts=None):
"""
Search for library in all permutations of `paths` and `exts`.
If nothing is found None is returned.
"""
if not paths or not exts:
lib = _find_library(lib_name)
if lib is None and lib_name.startswith('lib'):
lib = _find_library(lib_name[3:])
return lib
for lib_name in [lib_name] + ([lib_name[3:]] if lib_name.startswith('lib') else []):
for path in paths:
for ext in exts:
lib_path = os.path.join(path, lib_name + ext)
if os.path.exists(lib_path):
return lib_path
return None
if __name__ == '__main__':
print load_library(sys.argv[1])
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