annotate Lib/test/test_struct.py @ 73798:6cde416ef03b

Credit Per Øyvind Karlsen for the initial implementation of the lzma module (issue #6715).
author Nadeem Vawda <nadeem.vawda@gmail.com>
date Thu, 01 Dec 2011 01:18:27 +0200
parents db3e15017172
children 03063e718f5f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 sys
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5
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6 from test.support import run_unittest
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7
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8 ISBIGENDIAN = sys.byteorder == "big"
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9 IS32BIT = sys.maxsize == 0x7fffffff
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10
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11 integer_codes = 'b', 'B', 'h', 'H', 'i', 'I', 'l', 'L', 'q', 'Q', 'n', 'N'
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12 byteorders = '', '@', '=', '<', '>', '!'
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13
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14 def iter_integer_formats(byteorders=byteorders):
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15 for code in integer_codes:
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16 for byteorder in byteorders:
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17 if (byteorder in ('', '@') and code in ('q', 'Q') and
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18 not HAVE_LONG_LONG):
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19 continue
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20 if (byteorder not in ('', '@') and code in ('n', 'N')):
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21 continue
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22 yield code, byteorder
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23
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24 # Native 'q' packing isn't available on systems that don't have the C
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25 # long long type.
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26 try:
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27 struct.pack('q', 5)
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28 except struct.error:
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29 HAVE_LONG_LONG = False
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30 else:
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31 HAVE_LONG_LONG = True
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32
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33 def string_reverse(s):
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34 return s[::-1]
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35
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36 def bigendian_to_native(value):
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37 if ISBIGENDIAN:
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38 return value
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39 else:
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40 return string_reverse(value)
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41
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42 class StructTest(unittest.TestCase):
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43 def test_isbigendian(self):
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44 self.assertEqual((struct.pack('=i', 1)[0] == 0), ISBIGENDIAN)
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46 def test_consistence(self):
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47 self.assertRaises(struct.error, struct.calcsize, 'Z')
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48
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49 sz = struct.calcsize('i')
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50 self.assertEqual(sz * 3, struct.calcsize('iii'))
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51
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52 fmt = 'cbxxxxxxhhhhiillffd?'
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53 fmt3 = '3c3b18x12h6i6l6f3d3?'
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54 sz = struct.calcsize(fmt)
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55 sz3 = struct.calcsize(fmt3)
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56 self.assertEqual(sz * 3, sz3)
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57
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58 self.assertRaises(struct.error, struct.pack, 'iii', 3)
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59 self.assertRaises(struct.error, struct.pack, 'i', 3, 3, 3)
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60 self.assertRaises((TypeError, struct.error), struct.pack, 'i', 'foo')
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61 self.assertRaises((TypeError, struct.error), struct.pack, 'P', 'foo')
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62 self.assertRaises(struct.error, struct.unpack, 'd', b'flap')
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63 s = struct.pack('ii', 1, 2)
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64 self.assertRaises(struct.error, struct.unpack, 'iii', s)
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65 self.assertRaises(struct.error, struct.unpack, 'i', s)
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66
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67 def test_transitiveness(self):
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68 c = b'a'
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69 b = 1
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70 h = 255
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71 i = 65535
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72 l = 65536
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73 f = 3.1415
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74 d = 3.1415
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75 t = True
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76
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77 for prefix in ('', '@', '<', '>', '=', '!'):
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78 for format in ('xcbhilfd?', 'xcBHILfd?'):
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79 format = prefix + format
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80 s = struct.pack(format, c, b, h, i, l, f, d, t)
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81 cp, bp, hp, ip, lp, fp, dp, tp = struct.unpack(format, s)
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82 self.assertEqual(cp, c)
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83 self.assertEqual(bp, b)
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84 self.assertEqual(hp, h)
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85 self.assertEqual(ip, i)
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86 self.assertEqual(lp, l)
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87 self.assertEqual(int(100 * fp), int(100 * f))
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88 self.assertEqual(int(100 * dp), int(100 * d))
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89 self.assertEqual(tp, t)
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90
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91 def test_new_features(self):
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92 # Test some of the new features in detail
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93 # (format, argument, big-endian result, little-endian result, asymmetric)
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94 tests = [
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95 ('c', b'a', b'a', b'a', 0),
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96 ('xc', b'a', b'\0a', b'\0a', 0),
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97 ('cx', b'a', b'a\0', b'a\0', 0),
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98 ('s', b'a', b'a', b'a', 0),
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99 ('0s', b'helloworld', b'', b'', 1),
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100 ('1s', b'helloworld', b'h', b'h', 1),
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101 ('9s', b'helloworld', b'helloworl', b'helloworl', 1),
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102 ('10s', b'helloworld', b'helloworld', b'helloworld', 0),
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103 ('11s', b'helloworld', b'helloworld\0', b'helloworld\0', 1),
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104 ('20s', b'helloworld', b'helloworld'+10*b'\0', b'helloworld'+10*b'\0', 1),
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105 ('b', 7, b'\7', b'\7', 0),
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106 ('b', -7, b'\371', b'\371', 0),
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107 ('B', 7, b'\7', b'\7', 0),
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108 ('B', 249, b'\371', b'\371', 0),
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109 ('h', 700, b'\002\274', b'\274\002', 0),
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110 ('h', -700, b'\375D', b'D\375', 0),
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111 ('H', 700, b'\002\274', b'\274\002', 0),
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112 ('H', 0x10000-700, b'\375D', b'D\375', 0),
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113 ('i', 70000000, b'\004,\035\200', b'\200\035,\004', 0),
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114 ('i', -70000000, b'\373\323\342\200', b'\200\342\323\373', 0),
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115 ('I', 70000000, b'\004,\035\200', b'\200\035,\004', 0),
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116 ('I', 0x100000000-70000000, b'\373\323\342\200', b'\200\342\323\373', 0),
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117 ('l', 70000000, b'\004,\035\200', b'\200\035,\004', 0),
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118 ('l', -70000000, b'\373\323\342\200', b'\200\342\323\373', 0),
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119 ('L', 70000000, b'\004,\035\200', b'\200\035,\004', 0),
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120 ('L', 0x100000000-70000000, b'\373\323\342\200', b'\200\342\323\373', 0),
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121 ('f', 2.0, b'@\000\000\000', b'\000\000\000@', 0),
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122 ('d', 2.0, b'@\000\000\000\000\000\000\000',
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123 b'\000\000\000\000\000\000\000@', 0),
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124 ('f', -2.0, b'\300\000\000\000', b'\000\000\000\300', 0),
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125 ('d', -2.0, b'\300\000\000\000\000\000\000\000',
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126 b'\000\000\000\000\000\000\000\300', 0),
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127 ('?', 0, b'\0', b'\0', 0),
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128 ('?', 3, b'\1', b'\1', 1),
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129 ('?', True, b'\1', b'\1', 0),
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130 ('?', [], b'\0', b'\0', 1),
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131 ('?', (1,), b'\1', b'\1', 1),
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132 ]
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133
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134 for fmt, arg, big, lil, asy in tests:
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135 for (xfmt, exp) in [('>'+fmt, big), ('!'+fmt, big), ('<'+fmt, lil),
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136 ('='+fmt, ISBIGENDIAN and big or lil)]:
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137 res = struct.pack(xfmt, arg)
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138 self.assertEqual(res, exp)
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139 self.assertEqual(struct.calcsize(xfmt), len(res))
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140 rev = struct.unpack(xfmt, res)[0]
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141 if rev != arg:
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142 self.assertTrue(asy)
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143
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144 def test_calcsize(self):
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145 expected_size = {
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146 'b': 1, 'B': 1,
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147 'h': 2, 'H': 2,
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148 'i': 4, 'I': 4,
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149 'l': 4, 'L': 4,
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150 'q': 8, 'Q': 8,
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151 }
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152
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153 # standard integer sizes
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154 for code, byteorder in iter_integer_formats(('=', '<', '>', '!')):
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155 format = byteorder+code
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156 size = struct.calcsize(format)
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157 self.assertEqual(size, expected_size[code])
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158
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159 # native integer sizes
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160 native_pairs = 'bB', 'hH', 'iI', 'lL', 'nN'
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161 if HAVE_LONG_LONG:
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162 native_pairs += 'qQ',
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163 for format_pair in native_pairs:
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164 for byteorder in '', '@':
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165 signed_size = struct.calcsize(byteorder + format_pair[0])
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166 unsigned_size = struct.calcsize(byteorder + format_pair[1])
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167 self.assertEqual(signed_size, unsigned_size)
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168
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169 # bounds for native integer sizes
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170 self.assertEqual(struct.calcsize('b'), 1)
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171 self.assertLessEqual(2, struct.calcsize('h'))
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172 self.assertLessEqual(4, struct.calcsize('l'))
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173 self.assertLessEqual(struct.calcsize('h'), struct.calcsize('i'))
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174 self.assertLessEqual(struct.calcsize('i'), struct.calcsize('l'))
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175 if HAVE_LONG_LONG:
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176 self.assertLessEqual(8, struct.calcsize('q'))
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177 self.assertLessEqual(struct.calcsize('l'), struct.calcsize('q'))
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178 self.assertGreaterEqual(struct.calcsize('n'), struct.calcsize('i'))
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179 self.assertGreaterEqual(struct.calcsize('n'), struct.calcsize('P'))
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180
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181 def test_integers(self):
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182 # Integer tests (bBhHiIlLqQnN).
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183 import binascii
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184
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185 class IntTester(unittest.TestCase):
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186 def __init__(self, format):
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187 super(IntTester, self).__init__(methodName='test_one')
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188 self.format = format
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189 self.code = format[-1]
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190 self.byteorder = format[:-1]
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191 if not self.byteorder in byteorders:
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192 raise ValueError("unrecognized packing byteorder: %s" %
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193 self.byteorder)
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194 self.bytesize = struct.calcsize(format)
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195 self.bitsize = self.bytesize * 8
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196 if self.code in tuple('bhilqn'):
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197 self.signed = True
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198 self.min_value = -(2**(self.bitsize-1))
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199 self.max_value = 2**(self.bitsize-1) - 1
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200 elif self.code in tuple('BHILQN'):
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201 self.signed = False
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202 self.min_value = 0
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203 self.max_value = 2**self.bitsize - 1
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204 else:
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205 raise ValueError("unrecognized format code: %s" %
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206 self.code)
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207
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208 def test_one(self, x, pack=struct.pack,
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209 unpack=struct.unpack,
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210 unhexlify=binascii.unhexlify):
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211
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212 format = self.format
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213 if self.min_value <= x <= self.max_value:
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214 expected = x
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215 if self.signed and x < 0:
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216 expected += 1 << self.bitsize
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217 self.assertGreaterEqual(expected, 0)
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218 expected = '%x' % expected
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219 if len(expected) & 1:
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220 expected = "0" + expected
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221 expected = expected.encode('ascii')
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222 expected = unhexlify(expected)
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223 expected = (b"\x00" * (self.bytesize - len(expected)) +
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224 expected)
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225 if (self.byteorder == '<' or
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226 self.byteorder in ('', '@', '=') and not ISBIGENDIAN):
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227 expected = string_reverse(expected)
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228 self.assertEqual(len(expected), self.bytesize)
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229
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230 # Pack work?
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231 got = pack(format, x)
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232 self.assertEqual(got, expected)
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233
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234 # Unpack work?
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235 retrieved = unpack(format, got)[0]
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236 self.assertEqual(x, retrieved)
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237
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238 # Adding any byte should cause a "too big" error.
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239 self.assertRaises((struct.error, TypeError), unpack, format,
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240 b'\x01' + got)
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241 else:
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242 # x is out of range -- verify pack realizes that.
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243 self.assertRaises((OverflowError, ValueError, struct.error),
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244 pack, format, x)
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245
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246 def run(self):
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247 from random import randrange
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248
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249 # Create all interesting powers of 2.
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250 values = []
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251 for exp in range(self.bitsize + 3):
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252 values.append(1 << exp)
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253
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254 # Add some random values.
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255 for i in range(self.bitsize):
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256 val = 0
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257 for j in range(self.bytesize):
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258 val = (val << 8) | randrange(256)
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259 values.append(val)
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260
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261 # Values absorbed from other tests
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262 values.extend([300, 700000, sys.maxsize*4])
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263
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264 # Try all those, and their negations, and +-1 from
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265 # them. Note that this tests all power-of-2
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266 # boundaries in range, and a few out of range, plus
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267 # +-(2**n +- 1).
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268 for base in values:
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269 for val in -base, base:
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270 for incr in -1, 0, 1:
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271 x = val + incr
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272 self.test_one(x)
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273
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274 # Some error cases.
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275 class NotAnInt:
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276 def __int__(self):
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277 return 42
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278
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279 # Objects with an '__index__' method should be allowed
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280 # to pack as integers. That is assuming the implemented
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281 # '__index__' method returns and 'int' or 'long'.
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282 class Indexable(object):
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283 def __init__(self, value):
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284 self._value = value
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285
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286 def __index__(self):
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287 return self._value
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288
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289 # If the '__index__' method raises a type error, then
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290 # '__int__' should be used with a deprecation warning.
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291 class BadIndex(object):
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292 def __index__(self):
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293 raise TypeError
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294
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295 def __int__(self):
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296 return 42
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297
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298 self.assertRaises((TypeError, struct.error),
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299 struct.pack, self.format,
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300 "a string")
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301 self.assertRaises((TypeError, struct.error),
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302 struct.pack, self.format,
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303 randrange)
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304 self.assertRaises((TypeError, struct.error),
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305 struct.pack, self.format,
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306 3+42j)
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307 self.assertRaises((TypeError, struct.error),
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308 struct.pack, self.format,
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309 NotAnInt())
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310 self.assertRaises((TypeError, struct.error),
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311 struct.pack, self.format,
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312 BadIndex())
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313
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314 # Check for legitimate values from '__index__'.
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315 for obj in (Indexable(0), Indexable(10), Indexable(17),
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316 Indexable(42), Indexable(100), Indexable(127)):
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317 try:
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318 struct.pack(format, obj)
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319 except:
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320 self.fail("integer code pack failed on object "
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321 "with '__index__' method")
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322
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323 # Check for bogus values from '__index__'.
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324 for obj in (Indexable(b'a'), Indexable('b'), Indexable(None),
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325 Indexable({'a': 1}), Indexable([1, 2, 3])):
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326 self.assertRaises((TypeError, struct.error),
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327 struct.pack, self.format,
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328 obj)
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329
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330 for code, byteorder in iter_integer_formats():
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331 format = byteorder+code
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332 t = IntTester(format)
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333 t.run()
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334
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335 def test_nN_code(self):
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336 # n and N don't exist in standard sizes
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337 def assertStructError(func, *args, **kwargs):
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338 with self.assertRaises(struct.error) as cm:
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339 func(*args, **kwargs)
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340 self.assertIn("bad char in struct format", str(cm.exception))
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341 for code in 'nN':
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342 for byteorder in ('=', '<', '>', '!'):
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343 format = byteorder+code
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344 assertStructError(struct.calcsize, format)
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345 assertStructError(struct.pack, format, 0)
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346 assertStructError(struct.unpack, format, b"")
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347
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348 def test_p_code(self):
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349 # Test p ("Pascal string") code.
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350 for code, input, expected, expectedback in [
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351 ('p', b'abc', b'\x00', b''),
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352 ('1p', b'abc', b'\x00', b''),
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353 ('2p', b'abc', b'\x01a', b'a'),
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354 ('3p', b'abc', b'\x02ab', b'ab'),
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355 ('4p', b'abc', b'\x03abc', b'abc'),
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356 ('5p', b'abc', b'\x03abc\x00', b'abc'),
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357 ('6p', b'abc', b'\x03abc\x00\x00', b'abc'),
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358 ('1000p', b'x'*1000, b'\xff' + b'x'*999, b'x'*255)]:
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359 got = struct.pack(code, input)
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360 self.assertEqual(got, expected)
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361 (got,) = struct.unpack(code, got)
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362 self.assertEqual(got, expectedback)
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363
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364 def test_705836(self):
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365 # SF bug 705836. "<f" and ">f" had a severe rounding bug, where a carry
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366 # from the low-order discarded bits could propagate into the exponent
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367 # field, causing the result to be wrong by a factor of 2.
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368 import math
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369
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370 for base in range(1, 33):
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371 # smaller <- largest representable float less than base.
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372 delta = 0.5
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373 while base - delta / 2.0 != base:
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374 delta /= 2.0
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375 smaller = base - delta
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376 # Packing this rounds away a solid string of trailing 1 bits.
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377 packed = struct.pack("<f", smaller)
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378 unpacked = struct.unpack("<f", packed)[0]
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379 # This failed at base = 2, 4, and 32, with unpacked = 1, 2, and
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380 # 16, respectively.
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381 self.assertEqual(base, unpacked)
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382 bigpacked = struct.pack(">f", smaller)
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383 self.assertEqual(bigpacked, string_reverse(packed))
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384 unpacked = struct.unpack(">f", bigpacked)[0]
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385 self.assertEqual(base, unpacked)
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386
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387 # Largest finite IEEE single.
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388 big = (1 << 24) - 1
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389 big = math.ldexp(big, 127 - 23)
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390 packed = struct.pack(">f", big)
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391 unpacked = struct.unpack(">f", packed)[0]
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392 self.assertEqual(big, unpacked)
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393
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394 # The same, but tack on a 1 bit so it rounds up to infinity.
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395 big = (1 << 25) - 1
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396 big = math.ldexp(big, 127 - 24)
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397 self.assertRaises(OverflowError, struct.pack, ">f", big)
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398
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399 def test_1530559(self):
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400 for code, byteorder in iter_integer_formats():
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401 format = byteorder + code
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402 self.assertRaises(struct.error, struct.pack, format, 1.0)
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403 self.assertRaises(struct.error, struct.pack, format, 1.5)
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404 self.assertRaises(struct.error, struct.pack, 'P', 1.0)
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405 self.assertRaises(struct.error, struct.pack, 'P', 1.5)
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406
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407 def test_unpack_from(self):
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408 test_string = b'abcd01234'
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409 fmt = '4s'
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410 s = struct.Struct(fmt)
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411 for cls in (bytes, bytearray):
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412 data = cls(test_string)
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413 self.assertEqual(s.unpack_from(data), (b'abcd',))
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414 self.assertEqual(s.unpack_from(data, 2), (b'cd01',))
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415 self.assertEqual(s.unpack_from(data, 4), (b'0123',))
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416 for i in range(6):
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417 self.assertEqual(s.unpack_from(data, i), (data[i:i+4],))
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418 for i in range(6, len(test_string) + 1):
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419 self.assertRaises(struct.error, s.unpack_from, data, i)
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420 for cls in (bytes, bytearray):
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421 data = cls(test_string)
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422 self.assertEqual(struct.unpack_from(fmt, data), (b'abcd',))
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423 self.assertEqual(struct.unpack_from(fmt, data, 2), (b'cd01',))
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424 self.assertEqual(struct.unpack_from(fmt, data, 4), (b'0123',))
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425 for i in range(6):
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426 self.assertEqual(struct.unpack_from(fmt, data, i), (data[i:i+4],))
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427 for i in range(6, len(test_string) + 1):
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428 self.assertRaises(struct.error, struct.unpack_from, fmt, data, i)
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429
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430 def test_pack_into(self):
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431 test_string = b'Reykjavik rocks, eow!'
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432 writable_buf = array.array('b', b' '*100)
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433 fmt = '21s'
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434 s = struct.Struct(fmt)
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435
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436 # Test without offset
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437 s.pack_into(writable_buf, 0, test_string)
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438 from_buf = writable_buf.tobytes()[:len(test_string)]
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439 self.assertEqual(from_buf, test_string)
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440
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441 # Test with offset.
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442 s.pack_into(writable_buf, 10, test_string)
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443 from_buf = writable_buf.tobytes()[:len(test_string)+10]
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444 self.assertEqual(from_buf, test_string[:10] + test_string)
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445
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diff changeset
446 # Go beyond boundaries.
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447 small_buf = array.array('b', b' '*10)
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448 self.assertRaises((ValueError, struct.error), s.pack_into, small_buf, 0,
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449 test_string)
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450 self.assertRaises((ValueError, struct.error), s.pack_into, small_buf, 2,
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451 test_string)
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452
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453 # Test bogus offset (issue 3694)
a83f10edb6ff #3694: fix an "XXX undetected error" leak in struct.
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454 sb = small_buf
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455 self.assertRaises((TypeError, struct.error), struct.pack_into, b'', sb,
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456 None)
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457
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458 def test_pack_into_fn(self):
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459 test_string = b'Reykjavik rocks, eow!'
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460 writable_buf = array.array('b', b' '*100)
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461 fmt = '21s'
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462 pack_into = lambda *args: struct.pack_into(fmt, *args)
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463
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464 # Test without offset.
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465 pack_into(writable_buf, 0, test_string)
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466 from_buf = writable_buf.tobytes()[:len(test_string)]
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467 self.assertEqual(from_buf, test_string)
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468
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469 # Test with offset.
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470 pack_into(writable_buf, 10, test_string)
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471 from_buf = writable_buf.tobytes()[:len(test_string)+10]
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472 self.assertEqual(from_buf, test_string[:10] + test_string)
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473
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474 # Go beyond boundaries.
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475 small_buf = array.array('b', b' '*10)
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476 self.assertRaises((ValueError, struct.error), pack_into, small_buf, 0,
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477 test_string)
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478 self.assertRaises((ValueError, struct.error), pack_into, small_buf, 2,
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479 test_string)
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480
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481 def test_unpack_with_buffer(self):
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482 # SF bug 1563759: struct.unpack doesn't support buffer protocol objects
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483 data1 = array.array('B', b'\x12\x34\x56\x78')
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484 data2 = memoryview(b'\x12\x34\x56\x78') # XXX b'......XXXX......', 6, 4
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485 for data in [data1, data2]:
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486 value, = struct.unpack('>I', data)
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487 self.assertEqual(value, 0x12345678)
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488
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489 def test_bool(self):
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490 class ExplodingBool(object):
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491 def __bool__(self):
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492 raise IOError
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493 for prefix in tuple("<>!=")+('',):
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494 false = (), [], [], '', 0
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495 true = [1], 'test', 5, -1, 0xffffffff+1, 0xffffffff/2
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496
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497 falseFormat = prefix + '?' * len(false)
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498 packedFalse = struct.pack(falseFormat, *false)
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499 unpackedFalse = struct.unpack(falseFormat, packedFalse)
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500
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501 trueFormat = prefix + '?' * len(true)
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502 packedTrue = struct.pack(trueFormat, *true)
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503 unpackedTrue = struct.unpack(trueFormat, packedTrue)
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504
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505 self.assertEqual(len(true), len(unpackedTrue))
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506 self.assertEqual(len(false), len(unpackedFalse))
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507
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508 for t in unpackedFalse:
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509 self.assertFalse(t)
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510 for t in unpackedTrue:
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511 self.assertTrue(t)
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512
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513 packed = struct.pack(prefix+'?', 1)
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514
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515 self.assertEqual(len(packed), struct.calcsize(prefix+'?'))
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516
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517 if len(packed) != 1:
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diff changeset
518 self.assertFalse(prefix, msg='encoded bool is not one byte: %r'
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519 %packed)
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520
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521 try:
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522 struct.pack(prefix + '?', ExplodingBool())
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523 except IOError:
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524 pass
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525 else:
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526 self.fail("Expected IOError: struct.pack(%r, "
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527 "ExplodingBool())" % (prefix + '?'))
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528
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529 for c in [b'\x01', b'\x7f', b'\xff', b'\x0f', b'\xf0']:
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530 self.assertTrue(struct.unpack('>?', c)[0])
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531
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532 def test_count_overflow(self):
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533 hugecount = '{}b'.format(sys.maxsize+1)
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534 self.assertRaises(struct.error, struct.calcsize, hugecount)
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535
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536 hugecount2 = '{}b{}H'.format(sys.maxsize//2, sys.maxsize//2)
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537 self.assertRaises(struct.error, struct.calcsize, hugecount2)
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538
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539 if IS32BIT:
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540 def test_crasher(self):
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541 self.assertRaises(MemoryError, struct.pack, "357913941b", "a")
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542
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543 def test_trailing_counter(self):
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544 store = array.array('b', b' '*100)
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545
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546 # format lists containing only count spec should result in an error
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547 self.assertRaises(struct.error, struct.pack, '12345')
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548 self.assertRaises(struct.error, struct.unpack, '12345', '')
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549 self.assertRaises(struct.error, struct.pack_into, '12345', store, 0)
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550 self.assertRaises(struct.error, struct.unpack_from, '12345', store, 0)
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551
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552 # Format lists with trailing count spec should result in an error
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553 self.assertRaises(struct.error, struct.pack, 'c12345', 'x')
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554 self.assertRaises(struct.error, struct.unpack, 'c12345', 'x')
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555 self.assertRaises(struct.error, struct.pack_into, 'c12345', store, 0,
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556 'x')
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557 self.assertRaises(struct.error, struct.unpack_from, 'c12345', store,
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558 0)
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559
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560 # Mixed format tests
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561 self.assertRaises(struct.error, struct.pack, '14s42', 'spam and eggs')
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562 self.assertRaises(struct.error, struct.unpack, '14s42',
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563 'spam and eggs')
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564 self.assertRaises(struct.error, struct.pack_into, '14s42', store, 0,
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565 'spam and eggs')
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566 self.assertRaises(struct.error, struct.unpack_from, '14s42', store, 0)
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567
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568 def test_Struct_reinitialization(self):
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569 # Issue 9422: there was a memory leak when reinitializing a
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570 # Struct instance. This test can be used to detect the leak
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571 # when running with regrtest -L.
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572 s = struct.Struct('i')
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573 s.__init__('ii')
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574
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575 def test_main():
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576 run_unittest(StructTest)
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577
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578 if __name__ == '__main__':
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579 test_main()