bindings/python/bt2/utils.py

   1 # The MIT License (MIT)
   2 #
   3 # Copyright (c) 2017 Philippe Proulx <pproulx@efficios.com>
   4 #
   5 # Permission is hereby granted, free of charge, to any person obtaining a copy
   6 # of this software and associated documentation files (the "Software"), to deal
   7 # in the Software without restriction, including without limitation the rights
   8 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   9 # copies of the Software, and to permit persons to whom the Software is
  10 # furnished to do so, subject to the following conditions:
  11 #
  12 # The above copyright notice and this permission notice shall be included in
  13 # all copies or substantial portions of the Software.
  14 #
  15 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18 # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  21 # THE SOFTWARE.
  22
  23 import bt2
  24
  25
  26 def _check_bool(o):
  27     if not isinstance(o, bool):
  28         raise TypeError("'{}' is not a 'bool' object".format(o.__class__.__name__))
  29
  30
  31 def _check_int(o):
  32     if not isinstance(o, int):
  33         raise TypeError("'{}' is not an 'int' object".format(o.__class__.__name__))
  34
  35
  36 def _check_float(o):
  37     if not isinstance(o, float):
  38         raise TypeError("'{}' is not a 'float' object".format(o.__class__.__name__))
  39
  40
  41 def _check_str(o):
  42     if not isinstance(o, str):
  43         raise TypeError("'{}' is not a 'str' object".format(o.__class__.__name__))
  44
  45
  46 def _check_type(o, expected_type):
  47     if not isinstance(o, expected_type):
  48         raise TypeError("'{}' is not a '{}' object".format(o.__class__.__name__,
  49                                                            expected_type))
  50
  51
  52 def _is_int64(v):
  53     _check_int(v)
  54     return v >= -(2**63) and v <= (2**63 - 1)
  55
  56
  57 def _is_uint64(v):
  58     _check_int(v)
  59     return v >= 0 and v <= (2**64 - 1)
  60
  61
  62 def _check_int64(v, msg=None):
  63     if not _is_int64(v):
  64         if msg is None:
  65             msg = 'expecting a signed 64-bit integral value'
  66
  67         msg += ' (got {})'.format(v)
  68         raise ValueError(msg)
  69
  70
  71 def _check_uint64(v, msg=None):
  72     if not _is_uint64(v):
  73         if msg is None:
  74             msg = 'expecting an unsigned 64-bit integral value'
  75
  76         msg += ' (got {})'.format(v)
  77         raise ValueError(msg)
  78
  79
  80 def _is_m1ull(v):
  81     return v == 18446744073709551615
  82
  83
  84 def _is_pow2(v):
  85     return v != 0 and ((v & (v - 1)) == 0)
  86
  87
  88 def _check_alignment(a):
  89     _check_uint64(a)
  90
  91     if not _is_pow2(a):
  92         raise ValueError('{} is not a power of two'.format(a))
  93
  94
  95 def _handle_ret(ret, msg=None):
  96     if int(ret) < 0:
  97         if msg is None:
  98             error = bt2.Error()
  99         else:
 100             error = bt2.Error(msg)
 101
 102         raise error
 103
 104
 105 def _handle_ptr(ptr, msg=None):
 106     if ptr is None:
 107         if msg is None:
 108             error = bt2.Error()
 109         else:
 110             error = bt2.Error(msg)
 111
 112         raise error