annotate Lib/test/test_struct.py @ 51749:1408feec0084 3.0

Merged revisions 69798 via svnmerge from svn+ssh://pythondev@svn.python.org/python/branches/py3k ................ r69798 | benjamin.peterson | 2009-02-19 22:02:38 -0600 (Thu, 19 Feb 2009) | 13 lines Merged revisions 69769,69776 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r69769 | georg.brandl | 2009-02-19 02:30:06 -0600 (Thu, 19 Feb 2009) | 1 line #5310, #3558: fix operator precedence table. ........ r69776 | georg.brandl | 2009-02-19 10:34:51 -0600 (Thu, 19 Feb 2009) | 2 lines #5317: update IronPython URL. ........ ................
author Benjamin Peterson <benjamin@python.org>
date Fri, 20 Feb 2009 04:05:32 +0000
parents fb905890d049
children a00745480120
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1 import array
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2 import unittest
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3 import struct
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4 import warnings
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5 warnings.filterwarnings("ignore", "struct integer overflow masking is deprecated",
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6 DeprecationWarning)
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7
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8 from functools import wraps
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9 from test.support import TestFailed, verbose, run_unittest
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10
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11 import sys
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12 ISBIGENDIAN = sys.byteorder == "big"
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13 IS32BIT = sys.maxsize == 0x7fffffff
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14 del sys
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15
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16 try:
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17 import _struct
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18 except ImportError:
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19 PY_STRUCT_RANGE_CHECKING = 0
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20 PY_STRUCT_OVERFLOW_MASKING = 1
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21 PY_STRUCT_FLOAT_COERCE = 2
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22 else:
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23 PY_STRUCT_RANGE_CHECKING = getattr(_struct, '_PY_STRUCT_RANGE_CHECKING', 0)
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24 PY_STRUCT_OVERFLOW_MASKING = getattr(_struct, '_PY_STRUCT_OVERFLOW_MASKING', 0)
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25 PY_STRUCT_FLOAT_COERCE = getattr(_struct, '_PY_STRUCT_FLOAT_COERCE', 0)
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26
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27 def string_reverse(s):
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28 return s[::-1]
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29
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30 def bigendian_to_native(value):
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31 if ISBIGENDIAN:
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32 return value
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33 else:
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34 return string_reverse(value)
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35
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36 def with_warning_restore(func):
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37 @wraps(func)
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38 def decorator(*args, **kw):
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39 with warnings.catch_warnings():
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40 # We need this function to warn every time, so stick an
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41 # unqualifed 'always' at the head of the filter list
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42 warnings.simplefilter("always")
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43 warnings.filterwarnings("error", category=DeprecationWarning)
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44 return func(*args, **kw)
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45 return decorator
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46
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47 @with_warning_restore
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48 def deprecated_err(func, *args):
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49 try:
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50 func(*args)
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51 except (struct.error, TypeError):
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52 pass
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53 except DeprecationWarning:
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54 if not PY_STRUCT_OVERFLOW_MASKING:
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55 raise TestFailed("%s%s expected to raise DeprecationWarning" % (
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56 func.__name__, args))
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57 else:
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58 raise TestFailed("%s%s did not raise error" % (
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59 func.__name__, args))
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61
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62 class StructTest(unittest.TestCase):
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63
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64 @with_warning_restore
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65 def check_float_coerce(self, format, number):
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66 # SF bug 1530559. struct.pack raises TypeError where it used to convert.
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67 if PY_STRUCT_FLOAT_COERCE == 2:
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68 # Test for pre-2.5 struct module
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69 packed = struct.pack(format, number)
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70 floored = struct.unpack(format, packed)[0]
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71 self.assertEqual(floored, int(number),
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72 "did not correcly coerce float to int")
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73 return
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74 try:
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75 struct.pack(format, number)
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76 except (struct.error, TypeError):
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77 if PY_STRUCT_FLOAT_COERCE:
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78 self.fail("expected DeprecationWarning for float coerce")
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79 except DeprecationWarning:
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80 if not PY_STRUCT_FLOAT_COERCE:
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81 self.fail("expected to raise struct.error for float coerce")
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82 else:
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83 self.fail("did not raise error for float coerce")
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84
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85 def test_isbigendian(self):
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86 self.assertEqual((struct.pack('=i', 1)[0] == 0), ISBIGENDIAN)
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87
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88 def test_consistence(self):
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89 self.assertRaises(struct.error, struct.calcsize, 'Z')
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90
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91 sz = struct.calcsize('i')
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92 self.assertEqual(sz * 3, struct.calcsize('iii'))
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93
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94 fmt = 'cbxxxxxxhhhhiillffd?'
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95 fmt3 = '3c3b18x12h6i6l6f3d3?'
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96 sz = struct.calcsize(fmt)
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97 sz3 = struct.calcsize(fmt3)
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98 self.assertEqual(sz * 3, sz3)
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99
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100 self.assertRaises(struct.error, struct.pack, 'iii', 3)
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101 self.assertRaises(struct.error, struct.pack, 'i', 3, 3, 3)
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102 self.assertRaises(struct.error, struct.pack, 'i', 'foo')
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103 self.assertRaises(struct.error, struct.pack, 'P', 'foo')
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104 self.assertRaises(struct.error, struct.unpack, 'd', b'flap')
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105 s = struct.pack('ii', 1, 2)
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106 self.assertRaises(struct.error, struct.unpack, 'iii', s)
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107 self.assertRaises(struct.error, struct.unpack, 'i', s)
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108
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109 def test_transitiveness(self):
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110 c = b'a'
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111 b = 1
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112 h = 255
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113 i = 65535
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114 l = 65536
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115 f = 3.1415
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116 d = 3.1415
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117 t = True
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118
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119 for prefix in ('', '@', '<', '>', '=', '!'):
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120 for format in ('xcbhilfd?', 'xcBHILfd?'):
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121 format = prefix + format
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122 s = struct.pack(format, c, b, h, i, l, f, d, t)
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123 cp, bp, hp, ip, lp, fp, dp, tp = struct.unpack(format, s)
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124 self.assertEqual(cp, c)
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125 self.assertEqual(bp, b)
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126 self.assertEqual(hp, h)
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127 self.assertEqual(ip, i)
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128 self.assertEqual(lp, l)
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129 self.assertEqual(int(100 * fp), int(100 * f))
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130 self.assertEqual(int(100 * dp), int(100 * d))
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131 self.assertEqual(tp, t)
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132
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133 def test_new_features(self):
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134 # Test some of the new features in detail
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135 # (format, argument, big-endian result, little-endian result, asymmetric)
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136 tests = [
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137 ('c', 'a', 'a', 'a', 0),
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138 ('xc', 'a', '\0a', '\0a', 0),
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139 ('cx', 'a', 'a\0', 'a\0', 0),
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140 ('s', 'a', 'a', 'a', 0),
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141 ('0s', 'helloworld', '', '', 1),
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142 ('1s', 'helloworld', 'h', 'h', 1),
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143 ('9s', 'helloworld', 'helloworl', 'helloworl', 1),
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144 ('10s', 'helloworld', 'helloworld', 'helloworld', 0),
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145 ('11s', 'helloworld', 'helloworld\0', 'helloworld\0', 1),
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146 ('20s', 'helloworld', 'helloworld'+10*'\0', 'helloworld'+10*'\0', 1),
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147 ('b', 7, '\7', '\7', 0),
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148 ('b', -7, '\371', '\371', 0),
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149 ('B', 7, '\7', '\7', 0),
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150 ('B', 249, '\371', '\371', 0),
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151 ('h', 700, '\002\274', '\274\002', 0),
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152 ('h', -700, '\375D', 'D\375', 0),
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153 ('H', 700, '\002\274', '\274\002', 0),
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154 ('H', 0x10000-700, '\375D', 'D\375', 0),
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155 ('i', 70000000, '\004,\035\200', '\200\035,\004', 0),
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156 ('i', -70000000, '\373\323\342\200', '\200\342\323\373', 0),
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157 ('I', 70000000, '\004,\035\200', '\200\035,\004', 0),
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158 ('I', 0x100000000-70000000, '\373\323\342\200', '\200\342\323\373', 0),
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159 ('l', 70000000, '\004,\035\200', '\200\035,\004', 0),
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160 ('l', -70000000, '\373\323\342\200', '\200\342\323\373', 0),
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161 ('L', 70000000, '\004,\035\200', '\200\035,\004', 0),
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162 ('L', 0x100000000-70000000, '\373\323\342\200', '\200\342\323\373', 0),
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163 ('f', 2.0, '@\000\000\000', '\000\000\000@', 0),
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164 ('d', 2.0, '@\000\000\000\000\000\000\000',
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165 '\000\000\000\000\000\000\000@', 0),
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166 ('f', -2.0, '\300\000\000\000', '\000\000\000\300', 0),
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167 ('d', -2.0, '\300\000\000\000\000\000\000\000',
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168 '\000\000\000\000\000\000\000\300', 0),
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169 ('?', 0, '\0', '\0', 0),
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170 ('?', 3, '\1', '\1', 1),
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171 ('?', True, '\1', '\1', 0),
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172 ('?', [], '\0', '\0', 1),
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173 ('?', (1,), '\1', '\1', 1),
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174 ]
18069
8e187740aa96 Initial support for 'q' and 'Q' struct format codes: for now, only in
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175
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176 for fmt, arg, big, lil, asy in tests:
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177 big = bytes(big, "latin-1")
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178 lil = bytes(lil, "latin-1")
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179 for (xfmt, exp) in [('>'+fmt, big), ('!'+fmt, big), ('<'+fmt, lil),
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180 ('='+fmt, ISBIGENDIAN and big or lil)]:
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181 res = struct.pack(xfmt, arg)
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182 self.assertEqual(res, exp)
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183 self.assertEqual(struct.calcsize(xfmt), len(res))
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184 rev = struct.unpack(xfmt, res)[0]
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185 if isinstance(arg, str):
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186 # Strings are returned as bytes since you can't know the
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187 # encoding of the string when packed.
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188 arg = bytes(arg, 'latin1')
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189 if rev != arg:
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190 self.assert_(asy)
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191
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192 def test_native_qQ(self):
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193 # can't pack -1 as unsigned regardless
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194 self.assertRaises((struct.error, TypeError), struct.pack, "Q", -1)
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195 # can't pack string as 'q' regardless
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196 self.assertRaises(struct.error, struct.pack, "q", "a")
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197 # ditto, but 'Q'
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198 self.assertRaises(struct.error, struct.pack, "Q", "a")
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199
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200 try:
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201 struct.pack("q", 5)
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202 except struct.error:
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203 # does not have native q/Q
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204 pass
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205 else:
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206 nbytes = struct.calcsize('q')
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207 # The expected values here are in big-endian format, primarily
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208 # because I'm on a little-endian machine and so this is the
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209 # clearest way (for me) to force the code to get exercised.
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210 for format, input, expected in (
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211 ('q', -1, '\xff' * nbytes),
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212 ('q', 0, '\x00' * nbytes),
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213 ('Q', 0, '\x00' * nbytes),
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214 ('q', 1, '\x00' * (nbytes-1) + '\x01'),
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215 ('Q', (1 << (8*nbytes))-1, '\xff' * nbytes),
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216 ('q', (1 << (8*nbytes-1))-1, '\x7f' + '\xff' * (nbytes - 1))):
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217 expected = bytes(expected, "latin-1")
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218 got = struct.pack(format, input)
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219 native_expected = bigendian_to_native(expected)
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220 self.assertEqual(got, native_expected)
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221 retrieved = struct.unpack(format, got)[0]
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222 self.assertEqual(retrieved, input)
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223
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224 def test_standard_integers(self):
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225 # Standard integer tests (bBhHiIlLqQ).
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226 import binascii
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227
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228 class IntTester(unittest.TestCase):
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229
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230 # XXX Most std integer modes fail to test for out-of-range.
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231 # The "i" and "l" codes appear to range-check OK on 32-bit boxes, but
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232 # fail to check correctly on some 64-bit ones (Tru64 Unix + Compaq C
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233 # reported by Mark Favas).
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234 BUGGY_RANGE_CHECK = "bBhHiIlL"
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235
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236 def __init__(self, formatpair, bytesize):
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237 self.assertEqual(len(formatpair), 2)
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238 self.formatpair = formatpair
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239 for direction in "<>!=":
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240 for code in formatpair:
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241 format = direction + code
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242 self.assertEqual(struct.calcsize(format), bytesize)
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243 self.bytesize = bytesize
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244 self.bitsize = bytesize * 8
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245 self.signed_code, self.unsigned_code = formatpair
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246 self.unsigned_min = 0
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247 self.unsigned_max = 2**self.bitsize - 1
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248 self.signed_min = -(2**(self.bitsize-1))
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249 self.signed_max = 2**(self.bitsize-1) - 1
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250
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251 def test_one(self, x, pack=struct.pack,
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252 unpack=struct.unpack,
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253 unhexlify=binascii.unhexlify):
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254 # Try signed.
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255 code = self.signed_code
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256 if self.signed_min <= x <= self.signed_max:
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257 # Try big-endian.
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258 expected = x
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259 if x < 0:
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260 expected += 1 << self.bitsize
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261 self.assert_(expected > 0)
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262 expected = hex(expected)[2:] # chop "0x"
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263 if len(expected) & 1:
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264 expected = "0" + expected
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265 expected = unhexlify(expected)
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266 expected = b"\x00" * (self.bytesize - len(expected)) + expected
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267
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268 # Pack work?
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269 format = ">" + code
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270 got = pack(format, x)
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271 self.assertEqual(got, expected)
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272
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273 # Unpack work?
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274 retrieved = unpack(format, got)[0]
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275 self.assertEqual(x, retrieved)
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276
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277 # Adding any byte should cause a "too big" error.
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278 self.assertRaises((struct.error, TypeError),
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279 unpack, format, b'\x01' + got)
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280
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281 # Try little-endian.
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282 format = "<" + code
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283 expected = string_reverse(expected)
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284
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285 # Pack work?
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286 got = pack(format, x)
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287 self.assertEqual(got, expected)
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288
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289 # Unpack work?
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290 retrieved = unpack(format, got)[0]
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291 self.assertEqual(x, retrieved)
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292
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293 # Adding any byte should cause a "too big" error.
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294 self.assertRaises((struct.error, TypeError),
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295 unpack, format, b'\x01' + got)
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296
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297 else:
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298 # x is out of range -- verify pack realizes that.
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299 if not PY_STRUCT_RANGE_CHECKING and code in self.BUGGY_RANGE_CHECK:
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300 if verbose:
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301 print("Skipping buggy range check for code", code)
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302 else:
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303 deprecated_err(pack, ">" + code, x)
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304 deprecated_err(pack, "<" + code, x)
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305
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306 # Much the same for unsigned.
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307 code = self.unsigned_code
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308 if self.unsigned_min <= x <= self.unsigned_max:
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309 # Try big-endian.
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310 format = ">" + code
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311 expected = x
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312 expected = hex(expected)[2:] # chop "0x"
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313 if len(expected) & 1:
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314 expected = "0" + expected
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315 expected = unhexlify(expected)
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316 expected = b"\x00" * (self.bytesize - len(expected)) + expected
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317
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318 # Pack work?
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319 got = pack(format, x)
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320 self.assertEqual(got, expected)
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321
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322 # Unpack work?
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323 retrieved = unpack(format, got)[0]
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324 self.assertEqual(x, retrieved)
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325
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326 # Adding any byte should cause a "too big" error.
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327 self.assertRaises((struct.error, TypeError),
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328 unpack, format, b'\x01' + got)
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329
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330 # Try little-endian.
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331 format = "<" + code
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332 expected = string_reverse(expected)
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333
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334 # Pack work?
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335 got = pack(format, x)
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336 self.assertEqual(got, expected)
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337
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338 # Unpack work?
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339 retrieved = unpack(format, got)[0]
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340 self.assertEqual(x, retrieved)
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341
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342 # Adding any byte should cause a "too big" error.
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343 self.assertRaises((struct.error, TypeError),
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344 unpack, format, b'\x01' + got)
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345
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346 else:
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347 # x is out of range -- verify pack realizes that.
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348 if not PY_STRUCT_RANGE_CHECKING and code in self.BUGGY_RANGE_CHECK:
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349 if verbose:
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350 print("Skipping buggy range check for code", code)
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351 else:
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352 deprecated_err(pack, ">" + code, x)
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353 deprecated_err(pack, "<" + code, x)
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354
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355 def run(self):
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356 from random import randrange
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357
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358 # Create all interesting powers of 2.
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359 values = []
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360 for exp in range(self.bitsize + 3):
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361 values.append(1 << exp)
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362
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363 # Add some random values.
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364 for i in range(self.bitsize):
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365 val = 0
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366 for j in range(self.bytesize):
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367 val = (val << 8) | randrange(256)
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368 values.append(val)
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369
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370 # Try all those, and their negations, and +-1 from them. Note
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371 # that this tests all power-of-2 boundaries in range, and a few out
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372 # of range, plus +-(2**n +- 1).
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373 for base in values:
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374 for val in -base, base:
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375 for incr in -1, 0, 1:
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diff changeset
376 x = val + incr
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377 try:
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378 x = int(x)
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379 except OverflowError:
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diff changeset
380 pass
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381 self.test_one(x)
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382
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383 # Some error cases.
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384 for direction in "<>":
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385 for code in self.formatpair:
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386 for badobject in "a string", 3+42j, randrange:
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387 self.assertRaises((struct.error, TypeError),
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388 struct.pack, direction + code,
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389 badobject)
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390
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391 for args in [("bB", 1),
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392 ("hH", 2),
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393 ("iI", 4),
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394 ("lL", 4),
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395 ("qQ", 8)]:
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396 t = IntTester(*args)
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397 t.run()
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398
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399 def test_p_code(self):
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400 # Test p ("Pascal string") code.
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401 for code, input, expected, expectedback in [
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402 ('p','abc', '\x00', b''),
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403 ('1p', 'abc', '\x00', b''),
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404 ('2p', 'abc', '\x01a', b'a'),
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405 ('3p', 'abc', '\x02ab', b'ab'),
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406 ('4p', 'abc', '\x03abc', b'abc'),
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407 ('5p', 'abc', '\x03abc\x00', b'abc'),
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408 ('6p', 'abc', '\x03abc\x00\x00', b'abc'),
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409 ('1000p', 'x'*1000, '\xff' + 'x'*999, b'x'*255)]:
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410 expected = bytes(expected, "latin-1")
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411 got = struct.pack(code, input)
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412 self.assertEqual(got, expected)
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413 (got,) = struct.unpack(code, got)
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414 self.assertEqual(got, expectedback)
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415
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416 def test_705836(self):
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417 # SF bug 705836. "<f" and ">f" had a severe rounding bug, where a carry
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418 # from the low-order discarded bits could propagate into the exponent
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419 # field, causing the result to be wrong by a factor of 2.
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420 import math
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421
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422 for base in range(1, 33):
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423 # smaller <- largest representable float less than base.
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424 delta = 0.5
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diff changeset
425 while base - delta / 2.0 != base:
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diff changeset
426 delta /= 2.0
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diff changeset
427 smaller = base - delta
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428 # Packing this rounds away a solid string of trailing 1 bits.
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429 packed = struct.pack("<f", smaller)
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430 unpacked = struct.unpack("<f", packed)[0]
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431 # This failed at base = 2, 4, and 32, with unpacked = 1, 2, and
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432 # 16, respectively.
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433 self.assertEqual(base, unpacked)
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434 bigpacked = struct.pack(">f", smaller)
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435 self.assertEqual(bigpacked, string_reverse(packed))
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436 unpacked = struct.unpack(">f", bigpacked)[0]
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437 self.assertEqual(base, unpacked)
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438
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439 # Largest finite IEEE single.
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440 big = (1 << 24) - 1
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441 big = math.ldexp(big, 127 - 23)
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442 packed = struct.pack(">f", big)
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443 unpacked = struct.unpack(">f", packed)[0]
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444 self.assertEqual(big, unpacked)
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diff changeset
445
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diff changeset
446 # The same, but tack on a 1 bit so it rounds up to infinity.
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447 big = (1 << 25) - 1
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448 big = math.ldexp(big, 127 - 24)
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449 self.assertRaises(OverflowError, struct.pack, ">f", big)
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450
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451 if PY_STRUCT_RANGE_CHECKING:
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diff changeset
452 def test_1229380(self):
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453 # SF bug 1229380. No struct.pack exception for some out of
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diff changeset
454 # range integers
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455 import sys
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456 for endian in ('', '>', '<'):
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457 for fmt in ('B', 'H', 'I', 'L'):
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458 deprecated_err(struct.pack, endian + fmt, -1)
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459
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460 deprecated_err(struct.pack, endian + 'B', 300)
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461 deprecated_err(struct.pack, endian + 'H', 70000)
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462
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463 deprecated_err(struct.pack, endian + 'I', sys.maxsize * 4)
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464 deprecated_err(struct.pack, endian + 'L', sys.maxsize * 4)
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465
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466 def XXXtest_1530559(self):
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467 # XXX This is broken: see the bug report
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468 # SF bug 1530559. struct.pack raises TypeError where it used to convert.
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469 for endian in ('', '>', '<'):
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470 for fmt in ('B', 'H', 'I', 'L', 'b', 'h', 'i', 'l'):
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471 self.check_float_coerce(endian + fmt, 1.0)
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472 self.check_float_coerce(endian + fmt, 1.5)
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473
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474 def test_issue4228(self):
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475 # Packing a long may yield either 32 or 64 bits
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476 x = struct.pack('L', -1)[:4]
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477 self.assertEqual(x, b'\xff'*4)
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478
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479 def test_unpack_from(self):
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480 test_string = b'abcd01234'
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481 fmt = '4s'
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482 s = struct.Struct(fmt)
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483 for cls in (bytes, bytearray):
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484 data = cls(test_string)
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485 if not isinstance(data, (bytes, bytearray)):
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486 bytes_data = bytes(data, 'latin1')
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487 else:
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488 bytes_data = data
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489 self.assertEqual(s.unpack_from(data), (b'abcd',))
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490 self.assertEqual(s.unpack_from(data, 2), (b'cd01',))
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491 self.assertEqual(s.unpack_from(data, 4), (b'0123',))
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492 for i in range(6):
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493 self.assertEqual(s.unpack_from(data, i), (bytes_data[i:i+4],))
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494 for i in range(6, len(test_string) + 1):
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495 self.assertRaises(struct.error, s.unpack_from, data, i)
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496 for cls in (bytes, bytearray):
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497 data = cls(test_string)
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498 self.assertEqual(struct.unpack_from(fmt, data), (b'abcd',))
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499 self.assertEqual(struct.unpack_from(fmt, data, 2), (b'cd01',))
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500 self.assertEqual(struct.unpack_from(fmt, data, 4), (b'0123',))
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501 for i in range(6):
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502 self.assertEqual(struct.unpack_from(fmt, data, i), (data[i:i+4],))
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503 for i in range(6, len(test_string) + 1):
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504 self.assertRaises(struct.error, struct.unpack_from, fmt, data, i)
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505
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506 def test_pack_into(self):
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507 test_string = b'Reykjavik rocks, eow!'
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508 writable_buf = array.array('b', b' '*100)
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509 fmt = '21s'
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510 s = struct.Struct(fmt)
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511
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512 # Test without offset
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513 s.pack_into(writable_buf, 0, test_string)
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514 from_buf = writable_buf.tostring()[:len(test_string)]
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515 self.assertEqual(from_buf, test_string)
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516
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517 # Test with offset.
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518 s.pack_into(writable_buf, 10, test_string)
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519 from_buf = writable_buf.tostring()[:len(test_string)+10]
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520 self.assertEqual(from_buf, test_string[:10] + test_string)
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521
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522 # Go beyond boundaries.
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523 small_buf = array.array('b', b' '*10)
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diff changeset
524 self.assertRaises(struct.error, s.pack_into, small_buf, 0, test_string)
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525 self.assertRaises(struct.error, s.pack_into, small_buf, 2, test_string)
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526
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527 def test_pack_into_fn(self):
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528 test_string = b'Reykjavik rocks, eow!'
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diff changeset
529 writable_buf = array.array('b', b' '*100)
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530 fmt = '21s'
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531 pack_into = lambda *args: struct.pack_into(fmt, *args)
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532
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533 # Test without offset.
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534 pack_into(writable_buf, 0, test_string)
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535 from_buf = writable_buf.tostring()[:len(test_string)]
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536 self.assertEqual(from_buf, test_string)
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537
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538 # Test with offset.
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diff changeset
539 pack_into(writable_buf, 10, test_string)
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540 from_buf = writable_buf.tostring()[:len(test_string)+10]
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541 self.assertEqual(from_buf, test_string[:10] + test_string)
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542
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543 # Go beyond boundaries.
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diff changeset
544 small_buf = array.array('b', b' '*10)
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diff changeset
545 self.assertRaises(struct.error, pack_into, small_buf, 0, test_string)
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diff changeset
546 self.assertRaises(struct.error, pack_into, small_buf, 2, test_string)
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547
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548 def test_unpack_with_buffer(self):
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549 # SF bug 1563759: struct.unpack doens't support buffer protocol objects
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diff changeset
550 data1 = array.array('B', b'\x12\x34\x56\x78')
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551 data2 = memoryview(b'\x12\x34\x56\x78') # XXX b'......XXXX......', 6, 4
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552 for data in [data1, data2]:
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553 value, = struct.unpack('>I', data)
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554 self.assertEqual(value, 0x12345678)
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555
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556 def test_bool(self):
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557 for prefix in tuple("<>!=")+('',):
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558 false = (), [], [], '', 0
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559 true = [1], 'test', 5, -1, 0xffffffff+1, 0xffffffff/2
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560
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561 falseFormat = prefix + '?' * len(false)
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562 packedFalse = struct.pack(falseFormat, *false)
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563 unpackedFalse = struct.unpack(falseFormat, packedFalse)
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564
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565 trueFormat = prefix + '?' * len(true)
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566 packedTrue = struct.pack(trueFormat, *true)
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567 unpackedTrue = struct.unpack(trueFormat, packedTrue)
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568
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569 self.assertEqual(len(true), len(unpackedTrue))
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570 self.assertEqual(len(false), len(unpackedFalse))
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571
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572 for t in unpackedFalse:
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573 self.assertFalse(t)
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574 for t in unpackedTrue:
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575 self.assertTrue(t)
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576
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577 packed = struct.pack(prefix+'?', 1)
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578
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579 self.assertEqual(len(packed), struct.calcsize(prefix+'?'))
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580
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581 if len(packed) != 1:
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582 self.assertFalse(prefix, msg='encoded bool is not one byte: %r'
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583 %packed)
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584
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585 for c in [b'\x01', b'\x7f', b'\xff', b'\x0f', b'\xf0']:
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586 self.assertTrue(struct.unpack('>?', c)[0])
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587
48321
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588 if IS32BIT:
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589 def test_crasher(self):
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590 self.assertRaises(MemoryError, struct.pack, "357913941b", "a")
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591
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592
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593 def test_main():
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594 run_unittest(StructTest)
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595
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diff changeset
596 if __name__ == '__main__':
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597 test_main()