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annotate contrib/python-zstandard/tests/test_decompressor_fuzzing.py @ 39878:3e896b51aa5d

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storageutil: move metadata parsing and packing from revlog (API) Parsing and writing of revision text metadata is likely identical across storage backends. Let's move the code out of revlog so we don't need to import the revlog module in order to use it. Differential Revision: https://phab.mercurial-scm.org/D4754
author Gregory Szorc <gregory.szorc@gmail.com>
date Mon, 24 Sep 2018 14:31:31 -0700
parents b1fb341d8a61
children 675775c33ab6
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1 import io
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2 import os
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3 import unittest
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4
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5 try:
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6 import hypothesis
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7 import hypothesis.strategies as strategies
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8 except ImportError:
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9 raise unittest.SkipTest('hypothesis not available')
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10
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11 import zstandard as zstd
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12
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13 from . common import (
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14 make_cffi,
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15 random_input_data,
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16 )
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17
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18
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19 @unittest.skipUnless('ZSTD_SLOW_TESTS' in os.environ, 'ZSTD_SLOW_TESTS not set')
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20 @make_cffi
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21 class TestDecompressor_stream_reader_fuzzing(unittest.TestCase):
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22 @hypothesis.settings(
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23 suppress_health_check=[hypothesis.HealthCheck.large_base_example])
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24 @hypothesis.given(original=strategies.sampled_from(random_input_data()),
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25 level=strategies.integers(min_value=1, max_value=5),
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26 source_read_size=strategies.integers(1, 16384),
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27 read_sizes=strategies.data())
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28 def test_stream_source_read_variance(self, original, level, source_read_size,
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29 read_sizes):
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30 cctx = zstd.ZstdCompressor(level=level)
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31 frame = cctx.compress(original)
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32
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33 dctx = zstd.ZstdDecompressor()
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34 source = io.BytesIO(frame)
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35
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36 chunks = []
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37 with dctx.stream_reader(source, read_size=source_read_size) as reader:
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38 while True:
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39 read_size = read_sizes.draw(strategies.integers(1, 16384))
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40 chunk = reader.read(read_size)
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41 if not chunk:
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42 break
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43
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44 chunks.append(chunk)
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45
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46 self.assertEqual(b''.join(chunks), original)
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47
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48 @hypothesis.settings(
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49 suppress_health_check=[hypothesis.HealthCheck.large_base_example])
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50 @hypothesis.given(original=strategies.sampled_from(random_input_data()),
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51 level=strategies.integers(min_value=1, max_value=5),
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52 source_read_size=strategies.integers(1, 16384),
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53 read_sizes=strategies.data())
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54 def test_buffer_source_read_variance(self, original, level, source_read_size,
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55 read_sizes):
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56 cctx = zstd.ZstdCompressor(level=level)
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57 frame = cctx.compress(original)
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58
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59 dctx = zstd.ZstdDecompressor()
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60 chunks = []
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61
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62 with dctx.stream_reader(frame, read_size=source_read_size) as reader:
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63 while True:
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64 read_size = read_sizes.draw(strategies.integers(1, 16384))
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65 chunk = reader.read(read_size)
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66 if not chunk:
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67 break
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68
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69 chunks.append(chunk)
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70
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71 self.assertEqual(b''.join(chunks), original)
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72
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73 @hypothesis.settings(
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74 suppress_health_check=[hypothesis.HealthCheck.large_base_example])
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75 @hypothesis.given(
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76 original=strategies.sampled_from(random_input_data()),
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77 level=strategies.integers(min_value=1, max_value=5),
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78 source_read_size=strategies.integers(1, 16384),
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79 seek_amounts=strategies.data(),
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80 read_sizes=strategies.data())
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81 def test_relative_seeks(self, original, level, source_read_size, seek_amounts,
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82 read_sizes):
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83 cctx = zstd.ZstdCompressor(level=level)
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84 frame = cctx.compress(original)
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85
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86 dctx = zstd.ZstdDecompressor()
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87
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88 with dctx.stream_reader(frame, read_size=source_read_size) as reader:
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89 while True:
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90 amount = seek_amounts.draw(strategies.integers(0, 16384))
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91 reader.seek(amount, os.SEEK_CUR)
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92
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93 offset = reader.tell()
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94 read_amount = read_sizes.draw(strategies.integers(1, 16384))
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95 chunk = reader.read(read_amount)
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96
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97 if not chunk:
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98 break
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99
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100 self.assertEqual(original[offset:offset + len(chunk)], chunk)
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101
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102
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103 @unittest.skipUnless('ZSTD_SLOW_TESTS' in os.environ, 'ZSTD_SLOW_TESTS not set')
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104 @make_cffi
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105 class TestDecompressor_stream_writer_fuzzing(unittest.TestCase):
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106 @hypothesis.given(original=strategies.sampled_from(random_input_data()),
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107 level=strategies.integers(min_value=1, max_value=5),
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108 write_size=strategies.integers(min_value=1, max_value=8192),
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109 input_sizes=strategies.data())
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110 def test_write_size_variance(self, original, level, write_size, input_sizes):
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111 cctx = zstd.ZstdCompressor(level=level)
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112 frame = cctx.compress(original)
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113
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114 dctx = zstd.ZstdDecompressor()
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115 source = io.BytesIO(frame)
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116 dest = io.BytesIO()
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117
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118 with dctx.stream_writer(dest, write_size=write_size) as decompressor:
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119 while True:
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120 input_size = input_sizes.draw(strategies.integers(1, 4096))
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121 chunk = source.read(input_size)
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122 if not chunk:
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123 break
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124
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125 decompressor.write(chunk)
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126
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127 self.assertEqual(dest.getvalue(), original)
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128
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129
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130 @unittest.skipUnless('ZSTD_SLOW_TESTS' in os.environ, 'ZSTD_SLOW_TESTS not set')
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131 @make_cffi
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132 class TestDecompressor_copy_stream_fuzzing(unittest.TestCase):
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133 @hypothesis.given(original=strategies.sampled_from(random_input_data()),
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134 level=strategies.integers(min_value=1, max_value=5),
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135 read_size=strategies.integers(min_value=1, max_value=8192),
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136 write_size=strategies.integers(min_value=1, max_value=8192))
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137 def test_read_write_size_variance(self, original, level, read_size, write_size):
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138 cctx = zstd.ZstdCompressor(level=level)
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139 frame = cctx.compress(original)
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140
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141 source = io.BytesIO(frame)
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142 dest = io.BytesIO()
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143
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144 dctx = zstd.ZstdDecompressor()
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145 dctx.copy_stream(source, dest, read_size=read_size, write_size=write_size)
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146
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147 self.assertEqual(dest.getvalue(), original)
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148
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149
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150 @unittest.skipUnless('ZSTD_SLOW_TESTS' in os.environ, 'ZSTD_SLOW_TESTS not set')
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151 @make_cffi
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152 class TestDecompressor_decompressobj_fuzzing(unittest.TestCase):
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153 @hypothesis.given(original=strategies.sampled_from(random_input_data()),
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154 level=strategies.integers(min_value=1, max_value=5),
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155 chunk_sizes=strategies.data())
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156 def test_random_input_sizes(self, original, level, chunk_sizes):
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157 cctx = zstd.ZstdCompressor(level=level)
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158 frame = cctx.compress(original)
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159
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160 source = io.BytesIO(frame)
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161
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162 dctx = zstd.ZstdDecompressor()
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163 dobj = dctx.decompressobj()
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164
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165 chunks = []
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166 while True:
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167 chunk_size = chunk_sizes.draw(strategies.integers(1, 4096))
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168 chunk = source.read(chunk_size)
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169 if not chunk:
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170 break
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171
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172 chunks.append(dobj.decompress(chunk))
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173
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174 self.assertEqual(b''.join(chunks), original)
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175
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176 @hypothesis.given(original=strategies.sampled_from(random_input_data()),
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177 level=strategies.integers(min_value=1, max_value=5),
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178 write_size=strategies.integers(min_value=1,
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179 max_value=4 * zstd.DECOMPRESSION_RECOMMENDED_OUTPUT_SIZE),
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180 chunk_sizes=strategies.data())
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181 def test_random_output_sizes(self, original, level, write_size, chunk_sizes):
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182 cctx = zstd.ZstdCompressor(level=level)
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183 frame = cctx.compress(original)
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184
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185 source = io.BytesIO(frame)
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186
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187 dctx = zstd.ZstdDecompressor()
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188 dobj = dctx.decompressobj(write_size=write_size)
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189
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190 chunks = []
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191 while True:
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192 chunk_size = chunk_sizes.draw(strategies.integers(1, 4096))
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193 chunk = source.read(chunk_size)
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194 if not chunk:
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195 break
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196
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197 chunks.append(dobj.decompress(chunk))
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198
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199 self.assertEqual(b''.join(chunks), original)
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200
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201
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202 @unittest.skipUnless('ZSTD_SLOW_TESTS' in os.environ, 'ZSTD_SLOW_TESTS not set')
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203 @make_cffi
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204 class TestDecompressor_read_to_iter_fuzzing(unittest.TestCase):
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205 @hypothesis.given(original=strategies.sampled_from(random_input_data()),
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206 level=strategies.integers(min_value=1, max_value=5),
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207 read_size=strategies.integers(min_value=1, max_value=4096),
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208 write_size=strategies.integers(min_value=1, max_value=4096))
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209 def test_read_write_size_variance(self, original, level, read_size, write_size):
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210 cctx = zstd.ZstdCompressor(level=level)
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211 frame = cctx.compress(original)
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212
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diff changeset
213 source = io.BytesIO(frame)
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214
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215 dctx = zstd.ZstdDecompressor()
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216 chunks = list(dctx.read_to_iter(source, read_size=read_size, write_size=write_size))
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217
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diff changeset
218 self.assertEqual(b''.join(chunks), original)
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219
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220
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diff changeset
221 @unittest.skipUnless('ZSTD_SLOW_TESTS' in os.environ, 'ZSTD_SLOW_TESTS not set')
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222 class TestDecompressor_multi_decompress_to_buffer_fuzzing(unittest.TestCase):
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223 @hypothesis.given(original=strategies.lists(strategies.sampled_from(random_input_data()),
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224 min_size=1, max_size=1024),
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diff changeset
225 threads=strategies.integers(min_value=1, max_value=8),
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226 use_dict=strategies.booleans())
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227 def test_data_equivalence(self, original, threads, use_dict):
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228 kwargs = {}
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229 if use_dict:
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diff changeset
230 kwargs['dict_data'] = zstd.ZstdCompressionDict(original[0])
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231
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diff changeset
232 cctx = zstd.ZstdCompressor(level=1,
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233 write_content_size=True,
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diff changeset
234 write_checksum=True,
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diff changeset
235 **kwargs)
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diff changeset
236
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diff changeset
237 frames_buffer = cctx.multi_compress_to_buffer(original, threads=-1)
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238
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diff changeset
239 dctx = zstd.ZstdDecompressor(**kwargs)
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240
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diff changeset
241 result = dctx.multi_decompress_to_buffer(frames_buffer)
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242
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diff changeset
243 self.assertEqual(len(result), len(original))
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diff changeset
244 for i, frame in enumerate(result):
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245 self.assertEqual(frame.tobytes(), original[i])
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246
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diff changeset
247 frames_list = [f.tobytes() for f in frames_buffer]
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248 result = dctx.multi_decompress_to_buffer(frames_list)
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249
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diff changeset
250 self.assertEqual(len(result), len(original))
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diff changeset
251 for i, frame in enumerate(result):
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diff changeset
252 self.assertEqual(frame.tobytes(), original[i])