1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
import unittest
from ctypes import *
import re, sys
if sys.byteorder == "little":
THIS_ENDIAN = "<"
OTHER_ENDIAN = ">"
else:
THIS_ENDIAN = ">"
OTHER_ENDIAN = "<"
def normalize(format):
# Remove current endian specifier and white space from a format
# string
if format is None:
return ""
format = format.replace(OTHER_ENDIAN, THIS_ENDIAN)
return re.sub(r"\s", "", format)
class Test(unittest.TestCase):
def test_native_types(self):
for tp, fmt, shape, itemtp in native_types:
ob = tp()
v = memoryview(ob)
try:
self.assertEqual(normalize(v.format), normalize(fmt))
if shape is not None:
self.assertEqual(len(v), shape[0])
else:
self.assertEqual(len(v) * sizeof(itemtp), sizeof(ob))
self.assertEqual(v.itemsize, sizeof(itemtp))
self.assertEqual(v.shape, shape)
# ctypes object always have a non-strided memory block
self.assertEqual(v.strides, None)
# they are always read/write
self.assertFalse(v.readonly)
if v.shape:
n = 1
for dim in v.shape:
n = n * dim
self.assertEqual(n * v.itemsize, len(v.tobytes()))
except:
# so that we can see the failing type
print(tp)
raise
def test_endian_types(self):
for tp, fmt, shape, itemtp in endian_types:
ob = tp()
v = memoryview(ob)
try:
self.assertEqual(v.format, fmt)
if shape is not None:
self.assertEqual(len(v), shape[0])
else:
self.assertEqual(len(v) * sizeof(itemtp), sizeof(ob))
self.assertEqual(v.itemsize, sizeof(itemtp))
self.assertEqual(v.shape, shape)
# ctypes object always have a non-strided memory block
self.assertEqual(v.strides, None)
# they are always read/write
self.assertFalse(v.readonly)
if v.shape:
n = 1
for dim in v.shape:
n = n * dim
self.assertEqual(n, len(v))
except:
# so that we can see the failing type
print(tp)
raise
# define some structure classes
class Point(Structure):
_fields_ = [("x", c_long), ("y", c_long)]
class PackedPoint(Structure):
_pack_ = 2
_fields_ = [("x", c_long), ("y", c_long)]
class Point2(Structure):
pass
Point2._fields_ = [("x", c_long), ("y", c_long)]
class EmptyStruct(Structure):
_fields_ = []
class aUnion(Union):
_fields_ = [("a", c_int)]
class Incomplete(Structure):
pass
class Complete(Structure):
pass
PComplete = POINTER(Complete)
Complete._fields_ = [("a", c_long)]
################################################################
#
# This table contains format strings as they look on little endian
# machines. The test replaces '<' with '>' on big endian machines.
#
native_types = [
# type format shape calc itemsize
## simple types
(c_char, "<c", None, c_char),
(c_byte, "<b", None, c_byte),
(c_ubyte, "<B", None, c_ubyte),
(c_short, "<h", None, c_short),
(c_ushort, "<H", None, c_ushort),
# c_int and c_uint may be aliases to c_long
#(c_int, "<i", None, c_int),
#(c_uint, "<I", None, c_uint),
(c_long, "<l", None, c_long),
(c_ulong, "<L", None, c_ulong),
# c_longlong and c_ulonglong are aliases on 64-bit platforms
#(c_longlong, "<q", None, c_longlong),
#(c_ulonglong, "<Q", None, c_ulonglong),
(c_float, "<f", None, c_float),
(c_double, "<d", None, c_double),
# c_longdouble may be an alias to c_double
(c_bool, "<?", None, c_bool),
(py_object, "<O", None, py_object),
## pointers
(POINTER(c_byte), "&<b", None, POINTER(c_byte)),
(POINTER(POINTER(c_long)), "&&<l", None, POINTER(POINTER(c_long))),
## arrays and pointers
(c_double * 4, "(4)<d", (4,), c_double),
(c_float * 4 * 3 * 2, "(2,3,4)<f", (2,3,4), c_float),
(POINTER(c_short) * 2, "(2)&<h", (2,), POINTER(c_short)),
(POINTER(c_short) * 2 * 3, "(3,2)&<h", (3,2,), POINTER(c_short)),
(POINTER(c_short * 2), "&(2)<h", None, POINTER(c_short)),
## structures and unions
(Point, "T{<l:x:<l:y:}", None, Point),
# packed structures do not implement the pep
(PackedPoint, "B", None, PackedPoint),
(Point2, "T{<l:x:<l:y:}", None, Point2),
(EmptyStruct, "T{}", None, EmptyStruct),
# the pep does't support unions
(aUnion, "B", None, aUnion),
## pointer to incomplete structure
(Incomplete, "B", None, Incomplete),
(POINTER(Incomplete), "&B", None, POINTER(Incomplete)),
# 'Complete' is a structure that starts incomplete, but is completed after the
# pointer type to it has been created.
(Complete, "T{<l:a:}", None, Complete),
# Unfortunately the pointer format string is not fixed...
(POINTER(Complete), "&B", None, POINTER(Complete)),
## other
# function signatures are not implemented
(CFUNCTYPE(None), "X{}", None, CFUNCTYPE(None)),
]
class BEPoint(BigEndianStructure):
_fields_ = [("x", c_long), ("y", c_long)]
class LEPoint(LittleEndianStructure):
_fields_ = [("x", c_long), ("y", c_long)]
################################################################
#
# This table contains format strings as they really look, on both big
# and little endian machines.
#
endian_types = [
(BEPoint, "T{>l:x:>l:y:}", None, BEPoint),
(LEPoint, "T{<l:x:<l:y:}", None, LEPoint),
(POINTER(BEPoint), "&T{>l:x:>l:y:}", None, POINTER(BEPoint)),
(POINTER(LEPoint), "&T{<l:x:<l:y:}", None, POINTER(LEPoint)),
]
if __name__ == "__main__":
unittest.main()
|
