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annotate contrib/python-zstandard/tests/test_decompressor_fuzzing.py @ 37495:b1fb341d8a61

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zstandard: vendor python-zstandard 0.9.0 This was just released. It features a number of goodies. More info at https://gregoryszorc.com/blog/2018/04/09/release-of-python-zstandard-0.9/. The clang-format ignore list was updated to reflect the new source of files. The project contains a vendored copy of zstandard 1.3.4. The old version was 1.1.3. One of the changes between those versions is that zstandard is now dual licensed BSD + GPLv2 and the patent rights grant has been removed. Good riddance. The API should be backwards compatible. So no changes in core should be needed. However, there were a number of changes in the library that we'll want to adapt to. Those will be addressed in subsequent commits. Differential Revision: https://phab.mercurial-scm.org/D3198
author Gregory Szorc <gregory.szorc@gmail.com>
date Mon, 09 Apr 2018 10:13:29 -0700
parents e0dc40530c5a
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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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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diff changeset
208 write_size=strategies.integers(min_value=1, max_value=4096))
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parents:
diff changeset
209 def test_read_write_size_variance(self, original, level, read_size, write_size):
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diff changeset
210 cctx = zstd.ZstdCompressor(level=level)
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211 frame = cctx.compress(original)
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diff changeset
212
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diff changeset
213 source = io.BytesIO(frame)
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diff changeset
214
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diff changeset
215 dctx = zstd.ZstdDecompressor()
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diff changeset
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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diff changeset
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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diff changeset
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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Gregory Szorc <gregory.szorc@gmail.com>
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diff changeset
225 threads=strategies.integers(min_value=1, max_value=8),
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diff changeset
226 use_dict=strategies.booleans())
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diff changeset
227 def test_data_equivalence(self, original, threads, use_dict):
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228 kwargs = {}
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diff changeset
229 if use_dict:
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diff changeset
230 kwargs['dict_data'] = zstd.ZstdCompressionDict(original[0])
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diff changeset
231
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diff changeset
232 cctx = zstd.ZstdCompressor(level=1,
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diff changeset
233 write_content_size=True,
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Gregory Szorc <gregory.szorc@gmail.com>
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diff changeset
234 write_checksum=True,
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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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Gregory Szorc <gregory.szorc@gmail.com>
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diff changeset
244 for i, frame in enumerate(result):
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diff changeset
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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diff changeset
248 result = dctx.multi_decompress_to_buffer(frames_list)
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diff changeset
249
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diff changeset
250 self.assertEqual(len(result), len(original))
e0dc40530c5a zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
251 for i, frame in enumerate(result):
e0dc40530c5a zstd: vendor python-zstandard 0.8.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
252 self.assertEqual(frame.tobytes(), original[i])