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annotate contrib/python-zstandard/tests/test_compressor_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 73fef626dae3
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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 TestCompressor_stream_reader_fuzzing(unittest.TestCase):
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22 @hypothesis.given(original=strategies.sampled_from(random_input_data()),
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23 level=strategies.integers(min_value=1, max_value=5),
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24 source_read_size=strategies.integers(1, 16384),
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25 read_sizes=strategies.data())
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26 def test_stream_source_read_variance(self, original, level, source_read_size,
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27 read_sizes):
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28 refctx = zstd.ZstdCompressor(level=level)
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29 ref_frame = refctx.compress(original)
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30
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31 cctx = zstd.ZstdCompressor(level=level)
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32 with cctx.stream_reader(io.BytesIO(original), size=len(original),
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33 read_size=source_read_size) as reader:
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34 chunks = []
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35 while True:
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36 read_size = read_sizes.draw(strategies.integers(1, 16384))
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37 chunk = reader.read(read_size)
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38
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39 if not chunk:
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40 break
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41 chunks.append(chunk)
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42
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43 self.assertEqual(b''.join(chunks), ref_frame)
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44
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45 @hypothesis.given(original=strategies.sampled_from(random_input_data()),
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46 level=strategies.integers(min_value=1, max_value=5),
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47 source_read_size=strategies.integers(1, 16384),
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48 read_sizes=strategies.data())
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49 def test_buffer_source_read_variance(self, original, level, source_read_size,
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50 read_sizes):
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51
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52 refctx = zstd.ZstdCompressor(level=level)
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53 ref_frame = refctx.compress(original)
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54
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55 cctx = zstd.ZstdCompressor(level=level)
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56 with cctx.stream_reader(original, size=len(original),
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57 read_size=source_read_size) as reader:
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58 chunks = []
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59 while True:
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60 read_size = read_sizes.draw(strategies.integers(1, 16384))
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61 chunk = reader.read(read_size)
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62 if not chunk:
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63 break
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64 chunks.append(chunk)
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65
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66 self.assertEqual(b''.join(chunks), ref_frame)
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67
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68
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69 @unittest.skipUnless('ZSTD_SLOW_TESTS' in os.environ, 'ZSTD_SLOW_TESTS not set')
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70 @make_cffi
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71 class TestCompressor_stream_writer_fuzzing(unittest.TestCase):
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72 @hypothesis.given(original=strategies.sampled_from(random_input_data()),
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73 level=strategies.integers(min_value=1, max_value=5),
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74 write_size=strategies.integers(min_value=1, max_value=1048576))
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75 def test_write_size_variance(self, original, level, write_size):
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76 refctx = zstd.ZstdCompressor(level=level)
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77 ref_frame = refctx.compress(original)
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78
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79 cctx = zstd.ZstdCompressor(level=level)
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80 b = io.BytesIO()
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81 with cctx.stream_writer(b, size=len(original), write_size=write_size) as compressor:
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82 compressor.write(original)
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83
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84 self.assertEqual(b.getvalue(), ref_frame)
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85
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86
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87 @unittest.skipUnless('ZSTD_SLOW_TESTS' in os.environ, 'ZSTD_SLOW_TESTS not set')
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88 @make_cffi
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89 class TestCompressor_copy_stream_fuzzing(unittest.TestCase):
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90 @hypothesis.given(original=strategies.sampled_from(random_input_data()),
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91 level=strategies.integers(min_value=1, max_value=5),
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92 read_size=strategies.integers(min_value=1, max_value=1048576),
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93 write_size=strategies.integers(min_value=1, max_value=1048576))
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94 def test_read_write_size_variance(self, original, level, read_size, write_size):
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95 refctx = zstd.ZstdCompressor(level=level)
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96 ref_frame = refctx.compress(original)
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97
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98 cctx = zstd.ZstdCompressor(level=level)
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99 source = io.BytesIO(original)
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100 dest = io.BytesIO()
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101
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102 cctx.copy_stream(source, dest, size=len(original), read_size=read_size,
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103 write_size=write_size)
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104
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105 self.assertEqual(dest.getvalue(), ref_frame)
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106
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107
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108 @unittest.skipUnless('ZSTD_SLOW_TESTS' in os.environ, 'ZSTD_SLOW_TESTS not set')
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109 @make_cffi
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110 class TestCompressor_compressobj_fuzzing(unittest.TestCase):
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111 @hypothesis.settings(
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112 suppress_health_check=[hypothesis.HealthCheck.large_base_example])
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113 @hypothesis.given(original=strategies.sampled_from(random_input_data()),
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114 level=strategies.integers(min_value=1, max_value=5),
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115 chunk_sizes=strategies.data())
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116 def test_random_input_sizes(self, original, level, chunk_sizes):
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117 refctx = zstd.ZstdCompressor(level=level)
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118 ref_frame = refctx.compress(original)
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119
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120 cctx = zstd.ZstdCompressor(level=level)
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121 cobj = cctx.compressobj(size=len(original))
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122
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123 chunks = []
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124 i = 0
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125 while True:
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126 chunk_size = chunk_sizes.draw(strategies.integers(1, 4096))
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127 source = original[i:i + chunk_size]
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128 if not source:
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129 break
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130
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131 chunks.append(cobj.compress(source))
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132 i += chunk_size
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133
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134 chunks.append(cobj.flush())
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135
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136 self.assertEqual(b''.join(chunks), ref_frame)
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137
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138
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139 @unittest.skipUnless('ZSTD_SLOW_TESTS' in os.environ, 'ZSTD_SLOW_TESTS not set')
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140 @make_cffi
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141 class TestCompressor_read_to_iter_fuzzing(unittest.TestCase):
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142 @hypothesis.given(original=strategies.sampled_from(random_input_data()),
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143 level=strategies.integers(min_value=1, max_value=5),
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144 read_size=strategies.integers(min_value=1, max_value=4096),
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145 write_size=strategies.integers(min_value=1, max_value=4096))
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146 def test_read_write_size_variance(self, original, level, read_size, write_size):
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147 refcctx = zstd.ZstdCompressor(level=level)
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148 ref_frame = refcctx.compress(original)
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149
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150 source = io.BytesIO(original)
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151
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152 cctx = zstd.ZstdCompressor(level=level)
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153 chunks = list(cctx.read_to_iter(source, size=len(original),
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154 read_size=read_size,
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155 write_size=write_size))
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156
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157 self.assertEqual(b''.join(chunks), ref_frame)
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158
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159
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160 @unittest.skipUnless('ZSTD_SLOW_TESTS' in os.environ, 'ZSTD_SLOW_TESTS not set')
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161 class TestCompressor_multi_compress_to_buffer_fuzzing(unittest.TestCase):
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162 @hypothesis.given(original=strategies.lists(strategies.sampled_from(random_input_data()),
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163 min_size=1, max_size=1024),
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164 threads=strategies.integers(min_value=1, max_value=8),
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165 use_dict=strategies.booleans())
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166 def test_data_equivalence(self, original, threads, use_dict):
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167 kwargs = {}
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168
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169 # Use a content dictionary because it is cheap to create.
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170 if use_dict:
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171 kwargs['dict_data'] = zstd.ZstdCompressionDict(original[0])
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172
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173 cctx = zstd.ZstdCompressor(level=1,
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174 write_checksum=True,
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175 **kwargs)
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176
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177 result = cctx.multi_compress_to_buffer(original, threads=-1)
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178
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179 self.assertEqual(len(result), len(original))
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180
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181 # The frame produced via the batch APIs may not be bit identical to that
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182 # produced by compress() because compression parameters are adjusted
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183 # from the first input in batch mode. So the only thing we can do is
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184 # verify the decompressed data matches the input.
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185 dctx = zstd.ZstdDecompressor(**kwargs)
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186
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187 for i, frame in enumerate(result):
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188 self.assertEqual(dctx.decompress(frame), original[i])