1 | import os |
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2 | import array |
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3 | import unittest |
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4 | import struct |
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5 | import inspect |
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6 | from test import test_support as support |
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7 | from test.test_support import (check_warnings, check_py3k_warnings) |
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8 | |
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9 | import sys |
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10 | ISBIGENDIAN = sys.byteorder == "big" |
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11 | IS32BIT = sys.maxsize == 0x7fffffff |
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12 | |
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13 | integer_codes = 'b', 'B', 'h', 'H', 'i', 'I', 'l', 'L', 'q', 'Q' |
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14 | |
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15 | testmod_filename = os.path.splitext(__file__)[0] + '.py' |
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16 | # Native 'q' packing isn't available on systems that don't have the C |
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17 | # long long type. |
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18 | try: |
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19 | struct.pack('q', 5) |
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20 | except struct.error: |
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21 | HAVE_LONG_LONG = False |
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22 | else: |
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23 | HAVE_LONG_LONG = True |
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24 | |
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25 | def string_reverse(s): |
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26 | return "".join(reversed(s)) |
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27 | |
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28 | def bigendian_to_native(value): |
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29 | if ISBIGENDIAN: |
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30 | return value |
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31 | else: |
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32 | return string_reverse(value) |
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33 | |
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34 | class StructTest(unittest.TestCase): |
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35 | |
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36 | def check_float_coerce(self, format, number): |
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37 | # SF bug 1530559. struct.pack raises TypeError where it used |
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38 | # to convert. |
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39 | with check_warnings((".*integer argument expected, got float", |
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40 | DeprecationWarning)) as w: |
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41 | got = struct.pack(format, number) |
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42 | lineno = inspect.currentframe().f_lineno - 1 |
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43 | self.assertEqual(w.filename, testmod_filename) |
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44 | self.assertEqual(w.lineno, lineno) |
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45 | self.assertEqual(len(w.warnings), 1) |
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46 | expected = struct.pack(format, int(number)) |
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47 | self.assertEqual(got, expected) |
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48 | |
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49 | def test_isbigendian(self): |
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50 | self.assertEqual((struct.pack('=i', 1)[0] == chr(0)), ISBIGENDIAN) |
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51 | |
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52 | def test_consistence(self): |
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53 | self.assertRaises(struct.error, struct.calcsize, 'Z') |
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54 | |
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55 | sz = struct.calcsize('i') |
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56 | self.assertEqual(sz * 3, struct.calcsize('iii')) |
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57 | |
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58 | fmt = 'cbxxxxxxhhhhiillffd?' |
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59 | fmt3 = '3c3b18x12h6i6l6f3d3?' |
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60 | sz = struct.calcsize(fmt) |
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61 | sz3 = struct.calcsize(fmt3) |
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62 | self.assertEqual(sz * 3, sz3) |
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63 | |
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64 | self.assertRaises(struct.error, struct.pack, 'iii', 3) |
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65 | self.assertRaises(struct.error, struct.pack, 'i', 3, 3, 3) |
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66 | self.assertRaises((TypeError, struct.error), struct.pack, 'i', 'foo') |
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67 | self.assertRaises((TypeError, struct.error), struct.pack, 'P', 'foo') |
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68 | self.assertRaises(struct.error, struct.unpack, 'd', 'flap') |
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69 | s = struct.pack('ii', 1, 2) |
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70 | self.assertRaises(struct.error, struct.unpack, 'iii', s) |
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71 | self.assertRaises(struct.error, struct.unpack, 'i', s) |
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72 | |
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73 | def test_transitiveness(self): |
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74 | c = 'a' |
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75 | b = 1 |
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76 | h = 255 |
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77 | i = 65535 |
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78 | l = 65536 |
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79 | f = 3.1415 |
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80 | d = 3.1415 |
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81 | t = True |
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82 | |
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83 | for prefix in ('', '@', '<', '>', '=', '!'): |
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84 | for format in ('xcbhilfd?', 'xcBHILfd?'): |
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85 | format = prefix + format |
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86 | s = struct.pack(format, c, b, h, i, l, f, d, t) |
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87 | cp, bp, hp, ip, lp, fp, dp, tp = struct.unpack(format, s) |
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88 | self.assertEqual(cp, c) |
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89 | self.assertEqual(bp, b) |
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90 | self.assertEqual(hp, h) |
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91 | self.assertEqual(ip, i) |
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92 | self.assertEqual(lp, l) |
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93 | self.assertEqual(int(100 * fp), int(100 * f)) |
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94 | self.assertEqual(int(100 * dp), int(100 * d)) |
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95 | self.assertEqual(tp, t) |
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96 | |
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97 | def test_new_features(self): |
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98 | # Test some of the new features in detail |
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99 | # (format, argument, big-endian result, little-endian result, asymmetric) |
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100 | tests = [ |
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101 | ('c', 'a', 'a', 'a', 0), |
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102 | ('xc', 'a', '\0a', '\0a', 0), |
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103 | ('cx', 'a', 'a\0', 'a\0', 0), |
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104 | ('s', 'a', 'a', 'a', 0), |
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105 | ('0s', 'helloworld', '', '', 1), |
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106 | ('1s', 'helloworld', 'h', 'h', 1), |
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107 | ('9s', 'helloworld', 'helloworl', 'helloworl', 1), |
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108 | ('10s', 'helloworld', 'helloworld', 'helloworld', 0), |
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109 | ('11s', 'helloworld', 'helloworld\0', 'helloworld\0', 1), |
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110 | ('20s', 'helloworld', 'helloworld'+10*'\0', 'helloworld'+10*'\0', 1), |
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111 | ('b', 7, '\7', '\7', 0), |
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112 | ('b', -7, '\371', '\371', 0), |
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113 | ('B', 7, '\7', '\7', 0), |
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114 | ('B', 249, '\371', '\371', 0), |
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115 | ('h', 700, '\002\274', '\274\002', 0), |
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116 | ('h', -700, '\375D', 'D\375', 0), |
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117 | ('H', 700, '\002\274', '\274\002', 0), |
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118 | ('H', 0x10000-700, '\375D', 'D\375', 0), |
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119 | ('i', 70000000, '\004,\035\200', '\200\035,\004', 0), |
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120 | ('i', -70000000, '\373\323\342\200', '\200\342\323\373', 0), |
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121 | ('I', 70000000L, '\004,\035\200', '\200\035,\004', 0), |
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122 | ('I', 0x100000000L-70000000, '\373\323\342\200', '\200\342\323\373', 0), |
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123 | ('l', 70000000, '\004,\035\200', '\200\035,\004', 0), |
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124 | ('l', -70000000, '\373\323\342\200', '\200\342\323\373', 0), |
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125 | ('L', 70000000L, '\004,\035\200', '\200\035,\004', 0), |
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126 | ('L', 0x100000000L-70000000, '\373\323\342\200', '\200\342\323\373', 0), |
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127 | ('f', 2.0, '@\000\000\000', '\000\000\000@', 0), |
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128 | ('d', 2.0, '@\000\000\000\000\000\000\000', |
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129 | '\000\000\000\000\000\000\000@', 0), |
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130 | ('f', -2.0, '\300\000\000\000', '\000\000\000\300', 0), |
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131 | ('d', -2.0, '\300\000\000\000\000\000\000\000', |
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132 | '\000\000\000\000\000\000\000\300', 0), |
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133 | ('?', 0, '\0', '\0', 0), |
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134 | ('?', 3, '\1', '\1', 1), |
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135 | ('?', True, '\1', '\1', 0), |
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136 | ('?', [], '\0', '\0', 1), |
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137 | ('?', (1,), '\1', '\1', 1), |
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138 | ] |
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139 | |
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140 | for fmt, arg, big, lil, asy in tests: |
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141 | for (xfmt, exp) in [('>'+fmt, big), ('!'+fmt, big), ('<'+fmt, lil), |
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142 | ('='+fmt, ISBIGENDIAN and big or lil)]: |
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143 | res = struct.pack(xfmt, arg) |
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144 | self.assertEqual(res, exp) |
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145 | self.assertEqual(struct.calcsize(xfmt), len(res)) |
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146 | rev = struct.unpack(xfmt, res)[0] |
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147 | if rev != arg: |
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148 | self.assertTrue(asy) |
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149 | |
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150 | def test_calcsize(self): |
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151 | expected_size = { |
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152 | 'b': 1, 'B': 1, |
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153 | 'h': 2, 'H': 2, |
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154 | 'i': 4, 'I': 4, |
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155 | 'l': 4, 'L': 4, |
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156 | 'q': 8, 'Q': 8, |
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157 | } |
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158 | |
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159 | # standard integer sizes |
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160 | for code in integer_codes: |
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161 | for byteorder in ('=', '<', '>', '!'): |
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162 | format = byteorder+code |
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163 | size = struct.calcsize(format) |
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164 | self.assertEqual(size, expected_size[code]) |
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165 | |
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166 | # native integer sizes, except 'q' and 'Q' |
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167 | for format_pair in ('bB', 'hH', 'iI', 'lL'): |
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168 | for byteorder in ['', '@']: |
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169 | signed_size = struct.calcsize(byteorder + format_pair[0]) |
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170 | unsigned_size = struct.calcsize(byteorder + format_pair[1]) |
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171 | self.assertEqual(signed_size, unsigned_size) |
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172 | |
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173 | # bounds for native integer sizes |
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174 | self.assertEqual(struct.calcsize('b'), 1) |
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175 | self.assertLessEqual(2, struct.calcsize('h')) |
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176 | self.assertLessEqual(4, struct.calcsize('l')) |
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177 | self.assertLessEqual(struct.calcsize('h'), struct.calcsize('i')) |
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178 | self.assertLessEqual(struct.calcsize('i'), struct.calcsize('l')) |
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179 | |
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180 | # tests for native 'q' and 'Q' when applicable |
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181 | if HAVE_LONG_LONG: |
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182 | self.assertEqual(struct.calcsize('q'), struct.calcsize('Q')) |
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183 | self.assertLessEqual(8, struct.calcsize('q')) |
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184 | self.assertLessEqual(struct.calcsize('l'), struct.calcsize('q')) |
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185 | |
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186 | def test_integers(self): |
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187 | # Integer tests (bBhHiIlLqQ). |
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188 | import binascii |
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189 | |
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190 | class IntTester(unittest.TestCase): |
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191 | def __init__(self, format): |
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192 | super(IntTester, self).__init__(methodName='test_one') |
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193 | self.format = format |
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194 | self.code = format[-1] |
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195 | self.direction = format[:-1] |
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196 | if not self.direction in ('', '@', '=', '<', '>', '!'): |
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197 | raise ValueError("unrecognized packing direction: %s" % |
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198 | self.direction) |
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199 | self.bytesize = struct.calcsize(format) |
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200 | self.bitsize = self.bytesize * 8 |
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201 | if self.code in tuple('bhilq'): |
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202 | self.signed = True |
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203 | self.min_value = -(2L**(self.bitsize-1)) |
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204 | self.max_value = 2L**(self.bitsize-1) - 1 |
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205 | elif self.code in tuple('BHILQ'): |
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206 | self.signed = False |
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207 | self.min_value = 0 |
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208 | self.max_value = 2L**self.bitsize - 1 |
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209 | else: |
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210 | raise ValueError("unrecognized format code: %s" % |
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211 | self.code) |
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212 | |
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213 | def test_one(self, x, pack=struct.pack, |
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214 | unpack=struct.unpack, |
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215 | unhexlify=binascii.unhexlify): |
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216 | |
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217 | format = self.format |
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218 | if self.min_value <= x <= self.max_value: |
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219 | expected = long(x) |
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220 | if self.signed and x < 0: |
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221 | expected += 1L << self.bitsize |
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222 | self.assertGreaterEqual(expected, 0) |
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223 | expected = '%x' % expected |
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224 | if len(expected) & 1: |
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225 | expected = "0" + expected |
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226 | expected = unhexlify(expected) |
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227 | expected = ("\x00" * (self.bytesize - len(expected)) + |
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228 | expected) |
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229 | if (self.direction == '<' or |
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230 | self.direction in ('', '@', '=') and not ISBIGENDIAN): |
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231 | expected = string_reverse(expected) |
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232 | self.assertEqual(len(expected), self.bytesize) |
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233 | |
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234 | # Pack work? |
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235 | got = pack(format, x) |
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236 | self.assertEqual(got, expected) |
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237 | |
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238 | # Unpack work? |
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239 | retrieved = unpack(format, got)[0] |
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240 | self.assertEqual(x, retrieved) |
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241 | |
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242 | # Adding any byte should cause a "too big" error. |
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243 | self.assertRaises((struct.error, TypeError), unpack, format, |
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244 | '\x01' + got) |
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245 | else: |
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246 | # x is out of range -- verify pack realizes that. |
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247 | self.assertRaises((OverflowError, ValueError, struct.error), |
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248 | pack, format, x) |
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249 | |
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250 | def run(self): |
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251 | from random import randrange |
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252 | |
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253 | # Create all interesting powers of 2. |
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254 | values = [] |
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255 | for exp in range(self.bitsize + 3): |
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256 | values.append(1L << exp) |
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257 | |
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258 | # Add some random values. |
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259 | for i in range(self.bitsize): |
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260 | val = 0L |
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261 | for j in range(self.bytesize): |
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262 | val = (val << 8) | randrange(256) |
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263 | values.append(val) |
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264 | |
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265 | # Values absorbed from other tests |
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266 | values.extend([300, 700000, sys.maxint*4]) |
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267 | |
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268 | # Try all those, and their negations, and +-1 from |
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269 | # them. Note that this tests all power-of-2 |
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270 | # boundaries in range, and a few out of range, plus |
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271 | # +-(2**n +- 1). |
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272 | for base in values: |
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273 | for val in -base, base: |
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274 | for incr in -1, 0, 1: |
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275 | x = val + incr |
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276 | self.test_one(int(x)) |
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277 | self.test_one(long(x)) |
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278 | |
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279 | # Some error cases. |
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280 | class NotAnIntNS(object): |
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281 | def __int__(self): |
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282 | return 42 |
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283 | |
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284 | def __long__(self): |
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285 | return 1729L |
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286 | |
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287 | class NotAnIntOS: |
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288 | def __int__(self): |
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289 | return 85 |
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290 | |
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291 | def __long__(self): |
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292 | return -163L |
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293 | |
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294 | # Objects with an '__index__' method should be allowed |
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295 | # to pack as integers. That is assuming the implemented |
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296 | # '__index__' method returns and 'int' or 'long'. |
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297 | class Indexable(object): |
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298 | def __init__(self, value): |
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299 | self._value = value |
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300 | |
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301 | def __index__(self): |
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302 | return self._value |
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303 | |
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304 | # If the '__index__' method raises a type error, then |
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305 | # '__int__' should be used with a deprecation warning. |
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306 | class BadIndex(object): |
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307 | def __index__(self): |
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308 | raise TypeError |
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309 | |
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310 | def __int__(self): |
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311 | return 42 |
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312 | |
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313 | self.assertRaises((TypeError, struct.error), |
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314 | struct.pack, self.format, |
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315 | "a string") |
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316 | self.assertRaises((TypeError, struct.error), |
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317 | struct.pack, self.format, |
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318 | randrange) |
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319 | with check_warnings(("integer argument expected, " |
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320 | "got non-integer", DeprecationWarning)): |
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321 | with self.assertRaises((TypeError, struct.error)): |
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322 | struct.pack(self.format, 3+42j) |
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323 | |
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324 | # an attempt to convert a non-integer (with an |
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325 | # implicit conversion via __int__) should succeed, |
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326 | # with a DeprecationWarning |
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327 | for nonint in NotAnIntNS(), NotAnIntOS(), BadIndex(): |
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328 | with check_warnings((".*integer argument expected, got non" |
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329 | "-integer", DeprecationWarning)) as w: |
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330 | got = struct.pack(self.format, nonint) |
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331 | lineno = inspect.currentframe().f_lineno - 1 |
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332 | self.assertEqual(w.filename, testmod_filename) |
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333 | self.assertEqual(w.lineno, lineno) |
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334 | self.assertEqual(len(w.warnings), 1) |
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335 | expected = struct.pack(self.format, int(nonint)) |
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336 | self.assertEqual(got, expected) |
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337 | |
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338 | # Check for legitimate values from '__index__'. |
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339 | for obj in (Indexable(0), Indexable(10), Indexable(17), |
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340 | Indexable(42), Indexable(100), Indexable(127)): |
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341 | try: |
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342 | struct.pack(format, obj) |
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343 | except: |
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344 | self.fail("integer code pack failed on object " |
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345 | "with '__index__' method") |
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346 | |
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347 | # Check for bogus values from '__index__'. |
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348 | for obj in (Indexable('a'), Indexable(u'b'), Indexable(None), |
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349 | Indexable({'a': 1}), Indexable([1, 2, 3])): |
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350 | self.assertRaises((TypeError, struct.error), |
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351 | struct.pack, self.format, |
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352 | obj) |
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353 | |
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354 | byteorders = '', '@', '=', '<', '>', '!' |
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355 | for code in integer_codes: |
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356 | for byteorder in byteorders: |
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357 | if (byteorder in ('', '@') and code in ('q', 'Q') and |
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358 | not HAVE_LONG_LONG): |
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359 | continue |
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360 | format = byteorder+code |
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361 | t = IntTester(format) |
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362 | t.run() |
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363 | |
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364 | def test_p_code(self): |
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365 | # Test p ("Pascal string") code. |
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366 | for code, input, expected, expectedback in [ |
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367 | ('p','abc', '\x00', ''), |
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368 | ('1p', 'abc', '\x00', ''), |
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369 | ('2p', 'abc', '\x01a', 'a'), |
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370 | ('3p', 'abc', '\x02ab', 'ab'), |
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371 | ('4p', 'abc', '\x03abc', 'abc'), |
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372 | ('5p', 'abc', '\x03abc\x00', 'abc'), |
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373 | ('6p', 'abc', '\x03abc\x00\x00', 'abc'), |
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374 | ('1000p', 'x'*1000, '\xff' + 'x'*999, 'x'*255)]: |
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375 | got = struct.pack(code, input) |
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376 | self.assertEqual(got, expected) |
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377 | (got,) = struct.unpack(code, got) |
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378 | self.assertEqual(got, expectedback) |
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379 | |
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380 | def test_705836(self): |
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381 | # SF bug 705836. "<f" and ">f" had a severe rounding bug, where a carry |
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382 | # from the low-order discarded bits could propagate into the exponent |
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383 | # field, causing the result to be wrong by a factor of 2. |
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384 | import math |
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385 | |
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386 | for base in range(1, 33): |
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387 | # smaller <- largest representable float less than base. |
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388 | delta = 0.5 |
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389 | while base - delta / 2.0 != base: |
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390 | delta /= 2.0 |
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391 | smaller = base - delta |
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392 | # Packing this rounds away a solid string of trailing 1 bits. |
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393 | packed = struct.pack("<f", smaller) |
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394 | unpacked = struct.unpack("<f", packed)[0] |
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395 | # This failed at base = 2, 4, and 32, with unpacked = 1, 2, and |
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396 | # 16, respectively. |
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397 | self.assertEqual(base, unpacked) |
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398 | bigpacked = struct.pack(">f", smaller) |
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399 | self.assertEqual(bigpacked, string_reverse(packed)) |
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400 | unpacked = struct.unpack(">f", bigpacked)[0] |
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401 | self.assertEqual(base, unpacked) |
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402 | |
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403 | # Largest finite IEEE single. |
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404 | big = (1 << 24) - 1 |
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405 | big = math.ldexp(big, 127 - 23) |
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406 | packed = struct.pack(">f", big) |
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407 | unpacked = struct.unpack(">f", packed)[0] |
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408 | self.assertEqual(big, unpacked) |
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409 | |
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410 | # The same, but tack on a 1 bit so it rounds up to infinity. |
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411 | big = (1 << 25) - 1 |
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412 | big = math.ldexp(big, 127 - 24) |
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413 | self.assertRaises(OverflowError, struct.pack, ">f", big) |
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414 | |
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415 | def test_1530559(self): |
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416 | # SF bug 1530559. struct.pack raises TypeError where it used to convert. |
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417 | for endian in ('', '>', '<'): |
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418 | for fmt in integer_codes: |
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419 | self.check_float_coerce(endian + fmt, 1.0) |
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420 | self.check_float_coerce(endian + fmt, 1.5) |
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421 | |
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422 | def test_unpack_from(self, cls=str): |
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423 | data = cls('abcd01234') |
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424 | fmt = '4s' |
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425 | s = struct.Struct(fmt) |
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426 | |
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427 | self.assertEqual(s.unpack_from(data), ('abcd',)) |
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428 | self.assertEqual(struct.unpack_from(fmt, data), ('abcd',)) |
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429 | for i in xrange(6): |
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430 | self.assertEqual(s.unpack_from(data, i), (data[i:i+4],)) |
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431 | self.assertEqual(struct.unpack_from(fmt, data, i), (data[i:i+4],)) |
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432 | for i in xrange(6, len(data) + 1): |
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433 | self.assertRaises(struct.error, s.unpack_from, data, i) |
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434 | self.assertRaises(struct.error, struct.unpack_from, fmt, data, i) |
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435 | |
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436 | def test_pack_into(self, cls=bytearray, tobytes=str): |
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437 | test_string = 'Reykjavik rocks, eow!' |
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438 | writable_buf = cls(' '*100) |
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439 | fmt = '21s' |
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440 | s = struct.Struct(fmt) |
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441 | |
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442 | # Test without offset |
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443 | s.pack_into(writable_buf, 0, test_string) |
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444 | from_buf = tobytes(writable_buf)[:len(test_string)] |
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445 | self.assertEqual(from_buf, test_string) |
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446 | |
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447 | # Test with offset. |
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448 | s.pack_into(writable_buf, 10, test_string) |
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449 | from_buf = tobytes(writable_buf)[:len(test_string)+10] |
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450 | self.assertEqual(from_buf, test_string[:10] + test_string) |
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451 | |
---|
452 | # Go beyond boundaries. |
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453 | small_buf = cls(' '*10) |
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454 | self.assertRaises((ValueError, struct.error), s.pack_into, small_buf, 0, |
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455 | test_string) |
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456 | self.assertRaises((ValueError, struct.error), s.pack_into, small_buf, 2, |
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457 | test_string) |
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458 | |
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459 | # Test bogus offset (issue 3694) |
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460 | sb = small_buf |
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461 | self.assertRaises((TypeError, struct.error), struct.pack_into, b'', sb, |
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462 | None) |
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463 | |
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464 | def test_pack_into_array(self): |
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465 | self.test_pack_into(cls=lambda b: array.array('c', b), |
---|
466 | tobytes=array.array.tostring) |
---|
467 | |
---|
468 | def test_pack_into_memoryview(self): |
---|
469 | # Issue #22113 |
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470 | self.test_pack_into(cls=lambda b: memoryview(bytearray(b)), |
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471 | tobytes=memoryview.tobytes) |
---|
472 | |
---|
473 | def test_pack_into_fn(self): |
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474 | test_string = 'Reykjavik rocks, eow!' |
---|
475 | writable_buf = array.array('c', ' '*100) |
---|
476 | fmt = '21s' |
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477 | pack_into = lambda *args: struct.pack_into(fmt, *args) |
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478 | |
---|
479 | # Test without offset. |
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480 | pack_into(writable_buf, 0, test_string) |
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481 | from_buf = writable_buf.tostring()[:len(test_string)] |
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482 | self.assertEqual(from_buf, test_string) |
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483 | |
---|
484 | # Test with offset. |
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485 | pack_into(writable_buf, 10, test_string) |
---|
486 | from_buf = writable_buf.tostring()[:len(test_string)+10] |
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487 | self.assertEqual(from_buf, test_string[:10] + test_string) |
---|
488 | |
---|
489 | # Go beyond boundaries. |
---|
490 | small_buf = array.array('c', ' '*10) |
---|
491 | self.assertRaises((ValueError, struct.error), pack_into, small_buf, 0, |
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492 | test_string) |
---|
493 | self.assertRaises((ValueError, struct.error), pack_into, small_buf, 2, |
---|
494 | test_string) |
---|
495 | |
---|
496 | def test_unpack_with_buffer(self): |
---|
497 | with check_py3k_warnings(("buffer.. not supported in 3.x", |
---|
498 | DeprecationWarning)): |
---|
499 | # SF bug 1563759: struct.unpack doesn't support buffer protocol objects |
---|
500 | data1 = array.array('B', '\x12\x34\x56\x78') |
---|
501 | data2 = buffer('......\x12\x34\x56\x78......', 6, 4) |
---|
502 | for data in [data1, data2]: |
---|
503 | value, = struct.unpack('>I', data) |
---|
504 | self.assertEqual(value, 0x12345678) |
---|
505 | |
---|
506 | self.test_unpack_from(cls=buffer) |
---|
507 | |
---|
508 | def test_unpack_with_memoryview(self): |
---|
509 | # Bug 10212: struct.unpack doesn't support new buffer protocol objects |
---|
510 | data1 = memoryview('\x12\x34\x56\x78') |
---|
511 | for data in [data1,]: |
---|
512 | value, = struct.unpack('>I', data) |
---|
513 | self.assertEqual(value, 0x12345678) |
---|
514 | self.test_unpack_from(cls=memoryview) |
---|
515 | |
---|
516 | def test_bool(self): |
---|
517 | class ExplodingBool(object): |
---|
518 | def __nonzero__(self): |
---|
519 | raise IOError |
---|
520 | for prefix in tuple("<>!=")+('',): |
---|
521 | false = (), [], [], '', 0 |
---|
522 | true = [1], 'test', 5, -1, 0xffffffffL+1, 0xffffffff//2 |
---|
523 | |
---|
524 | falseFormat = prefix + '?' * len(false) |
---|
525 | packedFalse = struct.pack(falseFormat, *false) |
---|
526 | unpackedFalse = struct.unpack(falseFormat, packedFalse) |
---|
527 | |
---|
528 | trueFormat = prefix + '?' * len(true) |
---|
529 | packedTrue = struct.pack(trueFormat, *true) |
---|
530 | unpackedTrue = struct.unpack(trueFormat, packedTrue) |
---|
531 | |
---|
532 | self.assertEqual(len(true), len(unpackedTrue)) |
---|
533 | self.assertEqual(len(false), len(unpackedFalse)) |
---|
534 | |
---|
535 | for t in unpackedFalse: |
---|
536 | self.assertFalse(t) |
---|
537 | for t in unpackedTrue: |
---|
538 | self.assertTrue(t) |
---|
539 | |
---|
540 | packed = struct.pack(prefix+'?', 1) |
---|
541 | |
---|
542 | self.assertEqual(len(packed), struct.calcsize(prefix+'?')) |
---|
543 | |
---|
544 | if len(packed) != 1: |
---|
545 | self.assertFalse(prefix, msg='encoded bool is not one byte: %r' |
---|
546 | %packed) |
---|
547 | |
---|
548 | self.assertRaises(IOError, struct.pack, prefix + '?', |
---|
549 | ExplodingBool()) |
---|
550 | |
---|
551 | for c in [b'\x01', b'\x7f', b'\xff', b'\x0f', b'\xf0']: |
---|
552 | self.assertTrue(struct.unpack('>?', c)[0]) |
---|
553 | |
---|
554 | @unittest.skipUnless(IS32BIT, "Specific to 32bit machines") |
---|
555 | def test_crasher(self): |
---|
556 | self.assertRaises(MemoryError, struct.pack, "357913941c", "a") |
---|
557 | |
---|
558 | def test_count_overflow(self): |
---|
559 | hugecount = '{}b'.format(sys.maxsize+1) |
---|
560 | self.assertRaises(struct.error, struct.calcsize, hugecount) |
---|
561 | |
---|
562 | hugecount2 = '{}b{}H'.format(sys.maxsize//2, sys.maxsize//2) |
---|
563 | self.assertRaises(struct.error, struct.calcsize, hugecount2) |
---|
564 | |
---|
565 | def check_sizeof(self, format_str, number_of_codes): |
---|
566 | # The size of 'PyStructObject' |
---|
567 | totalsize = support.calcobjsize('5P') |
---|
568 | # The size taken up by the 'formatcode' dynamic array |
---|
569 | totalsize += struct.calcsize('3P') * (number_of_codes + 1) |
---|
570 | support.check_sizeof(self, struct.Struct(format_str), totalsize) |
---|
571 | |
---|
572 | @support.cpython_only |
---|
573 | def test__sizeof__(self): |
---|
574 | for code in integer_codes: |
---|
575 | self.check_sizeof(code, 1) |
---|
576 | self.check_sizeof('BHILfdspP', 9) |
---|
577 | self.check_sizeof('B' * 1234, 1234) |
---|
578 | self.check_sizeof('fd', 2) |
---|
579 | self.check_sizeof('xxxxxxxxxxxxxx', 0) |
---|
580 | self.check_sizeof('100H', 100) |
---|
581 | self.check_sizeof('187s', 1) |
---|
582 | self.check_sizeof('20p', 1) |
---|
583 | self.check_sizeof('0s', 1) |
---|
584 | self.check_sizeof('0c', 0) |
---|
585 | |
---|
586 | def test_unicode_format(self): |
---|
587 | try: |
---|
588 | unicode |
---|
589 | except NameError: |
---|
590 | self.skipTest('no unicode support') |
---|
591 | # Issue #19099 |
---|
592 | s = struct.Struct(unichr(ord('I'))) |
---|
593 | self.assertEqual(s.format, 'I') |
---|
594 | self.assertIs(type(s.format), str) |
---|
595 | self.assertRaises(ValueError, struct.Struct, unichr(0x80)) |
---|
596 | |
---|
597 | |
---|
598 | def test_main(): |
---|
599 | support.run_unittest(StructTest) |
---|
600 | |
---|
601 | if __name__ == '__main__': |
---|
602 | test_main() |
---|