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# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.
from __future__ import absolute_import, division, print_function
import os
import sys
from distutils.ccompiler import new_compiler
from distutils.dist import Distribution
from cffi import FFI
# Load the cryptography __about__ to get the current package version
base_src = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
about = {}
with open(os.path.join(base_src, "cryptography", "__about__.py")) as f:
exec(f.read(), about)
def build_ffi_for_binding(module_name, module_prefix, modules, libraries=[],
extra_compile_args=[], extra_link_args=[]):
"""
Modules listed in ``modules`` should have the following attributes:
* ``INCLUDES``: A string containing C includes.
* ``TYPES``: A string containing C declarations for types.
* ``FUNCTIONS``: A string containing C declarations for functions & macros.
* ``CUSTOMIZATIONS``: A string containing arbitrary top-level C code, this
can be used to do things like test for a define and provide an
alternate implementation based on that.
"""
types = []
includes = []
functions = []
customizations = []
for name in modules:
__import__(module_prefix + name)
module = sys.modules[module_prefix + name]
types.append(module.TYPES)
functions.append(module.FUNCTIONS)
includes.append(module.INCLUDES)
customizations.append(module.CUSTOMIZATIONS)
verify_source = "\n".join(
includes +
customizations
)
ffi = build_ffi(
module_name,
cdef_source="\n".join(types + functions),
verify_source=verify_source,
libraries=libraries,
extra_compile_args=extra_compile_args,
extra_link_args=extra_link_args,
)
return ffi
def build_ffi(module_name, cdef_source, verify_source, libraries=[],
extra_compile_args=[], extra_link_args=[]):
ffi = FFI()
# Always add the CRYPTOGRAPHY_PACKAGE_VERSION to the shared object
cdef_source += "\nstatic const char *const CRYPTOGRAPHY_PACKAGE_VERSION;"
verify_source += '\n#define CRYPTOGRAPHY_PACKAGE_VERSION "{}"'.format(
about["__version__"]
)
ffi.cdef(cdef_source)
ffi.set_source(
module_name,
verify_source,
libraries=libraries,
extra_compile_args=extra_compile_args,
extra_link_args=extra_link_args,
)
return ffi
def extra_link_args(compiler_type):
if compiler_type == 'msvc':
# Enable NX and ASLR for Windows builds on MSVC. These are enabled by
# default on Python 3.3+ but not on 2.x.
return ['/NXCOMPAT', '/DYNAMICBASE']
else:
return []
def compiler_type():
"""
Gets the compiler type from distutils. On Windows with MSVC it will be
"msvc". On macOS and linux it is "unix".
"""
dist = Distribution()
dist.parse_config_files()
cmd = dist.get_command_obj('build')
cmd.ensure_finalized()
compiler = new_compiler(compiler=cmd.compiler)
return compiler.compiler_type
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