| # |
| # Copyright 2015 ClusterHQ |
| # |
| # 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. |
| # |
| |
| """ |
| Utility functions for casting to a specific C type. |
| """ |
| from __future__ import absolute_import, division, print_function |
| |
| from .bindings.libnvpair import ffi as _ffi |
| |
| |
| def _ffi_cast(type_name): |
| type_info = _ffi.typeof(type_name) |
| |
| def _func(value): |
| # this is for overflow / underflow checking only |
| if type_info.kind == 'enum': |
| try: |
| type_info.elements[value] |
| except KeyError as e: |
| raise OverflowError('Invalid enum <%s> value %s: %s' % |
| (type_info.cname, value, e)) |
| else: |
| _ffi.new(type_name + '*', value) |
| return _ffi.cast(type_name, value) |
| _func.__name__ = type_name |
| return _func |
| |
| |
| uint8_t = _ffi_cast('uint8_t') |
| int8_t = _ffi_cast('int8_t') |
| uint16_t = _ffi_cast('uint16_t') |
| int16_t = _ffi_cast('int16_t') |
| uint32_t = _ffi_cast('uint32_t') |
| int32_t = _ffi_cast('int32_t') |
| uint64_t = _ffi_cast('uint64_t') |
| int64_t = _ffi_cast('int64_t') |
| boolean_t = _ffi_cast('boolean_t') |
| uchar_t = _ffi_cast('uchar_t') |
| |
| |
| # First element of the value tuple is a suffix for a single value function |
| # while the second element is for an array function |
| _type_to_suffix = { |
| _ffi.typeof('uint8_t'): ('uint8', 'uint8'), |
| _ffi.typeof('int8_t'): ('int8', 'int8'), |
| _ffi.typeof('uint16_t'): ('uint16', 'uint16'), |
| _ffi.typeof('int16_t'): ('int16', 'int16'), |
| _ffi.typeof('uint32_t'): ('uint32', 'uint32'), |
| _ffi.typeof('int32_t'): ('int32', 'int32'), |
| _ffi.typeof('uint64_t'): ('uint64', 'uint64'), |
| _ffi.typeof('int64_t'): ('int64', 'int64'), |
| _ffi.typeof('boolean_t'): ('boolean_value', 'boolean'), |
| _ffi.typeof('uchar_t'): ('byte', 'byte'), |
| } |
| |
| |
| # vim: softtabstop=4 tabstop=4 expandtab shiftwidth=4 |