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annotate contrib/python-zstandard/tests/test_data_structures.py @ 43994:de7838053207

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zstandard: vendor python-zstandard 0.13.0 Version 0.13.0 of the package was just released. It contains an upgraded zstd C library which can result in some performance wins, official support for Python 3.8, and a blackened code base. There were no meaningful code or functionality changes in this release of python-zstandard: just reformatting and an upgraded zstd library version. So the diff seems much larger than what it is. Files were added without modifications. The clang-format-ignorelist file was updated to reflect a new header file in the zstd distribution. # no-check-commit because 3rd party code has different style guidelines Differential Revision: https://phab.mercurial-scm.org/D7770
author Gregory Szorc <gregory.szorc@gmail.com>
date Sat, 28 Dec 2019 09:55:45 -0800
parents 69de49c4e39c
children 5e84a96d865b
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1 import sys
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2 import unittest
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3
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4 import zstandard as zstd
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5
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6 from .common import (
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7 make_cffi,
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8 TestCase,
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9 )
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11
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12 @make_cffi
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13 class TestCompressionParameters(TestCase):
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14 def test_bounds(self):
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15 zstd.ZstdCompressionParameters(
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16 window_log=zstd.WINDOWLOG_MIN,
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17 chain_log=zstd.CHAINLOG_MIN,
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18 hash_log=zstd.HASHLOG_MIN,
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19 search_log=zstd.SEARCHLOG_MIN,
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20 min_match=zstd.MINMATCH_MIN + 1,
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21 target_length=zstd.TARGETLENGTH_MIN,
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22 strategy=zstd.STRATEGY_FAST,
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23 )
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24
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25 zstd.ZstdCompressionParameters(
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26 window_log=zstd.WINDOWLOG_MAX,
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27 chain_log=zstd.CHAINLOG_MAX,
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28 hash_log=zstd.HASHLOG_MAX,
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29 search_log=zstd.SEARCHLOG_MAX,
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30 min_match=zstd.MINMATCH_MAX - 1,
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31 target_length=zstd.TARGETLENGTH_MAX,
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32 strategy=zstd.STRATEGY_BTULTRA2,
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33 )
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34
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35 def test_from_level(self):
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36 p = zstd.ZstdCompressionParameters.from_level(1)
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37 self.assertIsInstance(p, zstd.CompressionParameters)
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38
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39 self.assertEqual(p.window_log, 19)
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40
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41 p = zstd.ZstdCompressionParameters.from_level(-4)
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42 self.assertEqual(p.window_log, 19)
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43
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44 def test_members(self):
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45 p = zstd.ZstdCompressionParameters(
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46 window_log=10,
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47 chain_log=6,
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48 hash_log=7,
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49 search_log=4,
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50 min_match=5,
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51 target_length=8,
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52 strategy=1,
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53 )
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54 self.assertEqual(p.window_log, 10)
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55 self.assertEqual(p.chain_log, 6)
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56 self.assertEqual(p.hash_log, 7)
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57 self.assertEqual(p.search_log, 4)
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58 self.assertEqual(p.min_match, 5)
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59 self.assertEqual(p.target_length, 8)
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60 self.assertEqual(p.compression_strategy, 1)
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61
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62 p = zstd.ZstdCompressionParameters(compression_level=2)
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63 self.assertEqual(p.compression_level, 2)
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64
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65 p = zstd.ZstdCompressionParameters(threads=4)
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66 self.assertEqual(p.threads, 4)
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67
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68 p = zstd.ZstdCompressionParameters(threads=2, job_size=1048576, overlap_log=6)
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69 self.assertEqual(p.threads, 2)
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70 self.assertEqual(p.job_size, 1048576)
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71 self.assertEqual(p.overlap_log, 6)
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72 self.assertEqual(p.overlap_size_log, 6)
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73
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74 p = zstd.ZstdCompressionParameters(compression_level=-1)
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75 self.assertEqual(p.compression_level, -1)
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76
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77 p = zstd.ZstdCompressionParameters(compression_level=-2)
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78 self.assertEqual(p.compression_level, -2)
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79
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80 p = zstd.ZstdCompressionParameters(force_max_window=True)
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81 self.assertEqual(p.force_max_window, 1)
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82
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83 p = zstd.ZstdCompressionParameters(enable_ldm=True)
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84 self.assertEqual(p.enable_ldm, 1)
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85
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86 p = zstd.ZstdCompressionParameters(ldm_hash_log=7)
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87 self.assertEqual(p.ldm_hash_log, 7)
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88
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89 p = zstd.ZstdCompressionParameters(ldm_min_match=6)
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90 self.assertEqual(p.ldm_min_match, 6)
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91
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92 p = zstd.ZstdCompressionParameters(ldm_bucket_size_log=7)
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93 self.assertEqual(p.ldm_bucket_size_log, 7)
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94
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95 p = zstd.ZstdCompressionParameters(ldm_hash_rate_log=8)
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96 self.assertEqual(p.ldm_hash_every_log, 8)
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97 self.assertEqual(p.ldm_hash_rate_log, 8)
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98
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99 def test_estimated_compression_context_size(self):
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100 p = zstd.ZstdCompressionParameters(
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101 window_log=20,
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102 chain_log=16,
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103 hash_log=17,
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104 search_log=1,
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105 min_match=5,
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106 target_length=16,
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107 strategy=zstd.STRATEGY_DFAST,
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108 )
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109
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110 # 32-bit has slightly different values from 64-bit.
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111 self.assertAlmostEqual(
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112 p.estimated_compression_context_size(), 1294464, delta=400
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113 )
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114
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115 def test_strategy(self):
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116 with self.assertRaisesRegex(
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117 ValueError, "cannot specify both compression_strategy"
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118 ):
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119 zstd.ZstdCompressionParameters(strategy=0, compression_strategy=0)
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120
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121 p = zstd.ZstdCompressionParameters(strategy=2)
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122 self.assertEqual(p.compression_strategy, 2)
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123
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124 p = zstd.ZstdCompressionParameters(strategy=3)
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125 self.assertEqual(p.compression_strategy, 3)
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126
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127 def test_ldm_hash_rate_log(self):
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128 with self.assertRaisesRegex(
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129 ValueError, "cannot specify both ldm_hash_rate_log"
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130 ):
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131 zstd.ZstdCompressionParameters(ldm_hash_rate_log=8, ldm_hash_every_log=4)
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132
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133 p = zstd.ZstdCompressionParameters(ldm_hash_rate_log=8)
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134 self.assertEqual(p.ldm_hash_every_log, 8)
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135
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136 p = zstd.ZstdCompressionParameters(ldm_hash_every_log=16)
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137 self.assertEqual(p.ldm_hash_every_log, 16)
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138
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139 def test_overlap_log(self):
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140 with self.assertRaisesRegex(ValueError, "cannot specify both overlap_log"):
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141 zstd.ZstdCompressionParameters(overlap_log=1, overlap_size_log=9)
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142
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143 p = zstd.ZstdCompressionParameters(overlap_log=2)
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144 self.assertEqual(p.overlap_log, 2)
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145 self.assertEqual(p.overlap_size_log, 2)
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146
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147 p = zstd.ZstdCompressionParameters(overlap_size_log=4)
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148 self.assertEqual(p.overlap_log, 4)
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149 self.assertEqual(p.overlap_size_log, 4)
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150
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151
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152 @make_cffi
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153 class TestFrameParameters(TestCase):
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154 def test_invalid_type(self):
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155 with self.assertRaises(TypeError):
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156 zstd.get_frame_parameters(None)
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157
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158 # Python 3 doesn't appear to convert unicode to Py_buffer.
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159 if sys.version_info[0] >= 3:
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160 with self.assertRaises(TypeError):
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161 zstd.get_frame_parameters(u"foobarbaz")
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162 else:
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163 # CPython will convert unicode to Py_buffer. But CFFI won't.
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164 if zstd.backend == "cffi":
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165 with self.assertRaises(TypeError):
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166 zstd.get_frame_parameters(u"foobarbaz")
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167 else:
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168 with self.assertRaises(zstd.ZstdError):
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169 zstd.get_frame_parameters(u"foobarbaz")
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170
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171 def test_invalid_input_sizes(self):
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172 with self.assertRaisesRegex(zstd.ZstdError, "not enough data for frame"):
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173 zstd.get_frame_parameters(b"")
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174
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175 with self.assertRaisesRegex(zstd.ZstdError, "not enough data for frame"):
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176 zstd.get_frame_parameters(zstd.FRAME_HEADER)
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177
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178 def test_invalid_frame(self):
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179 with self.assertRaisesRegex(zstd.ZstdError, "Unknown frame descriptor"):
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180 zstd.get_frame_parameters(b"foobarbaz")
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181
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182 def test_attributes(self):
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183 params = zstd.get_frame_parameters(zstd.FRAME_HEADER + b"\x00\x00")
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184 self.assertEqual(params.content_size, zstd.CONTENTSIZE_UNKNOWN)
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185 self.assertEqual(params.window_size, 1024)
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186 self.assertEqual(params.dict_id, 0)
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187 self.assertFalse(params.has_checksum)
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188
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189 # Lowest 2 bits indicate a dictionary and length. Here, the dict id is 1 byte.
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190 params = zstd.get_frame_parameters(zstd.FRAME_HEADER + b"\x01\x00\xff")
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191 self.assertEqual(params.content_size, zstd.CONTENTSIZE_UNKNOWN)
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192 self.assertEqual(params.window_size, 1024)
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193 self.assertEqual(params.dict_id, 255)
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194 self.assertFalse(params.has_checksum)
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195
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196 # Lowest 3rd bit indicates if checksum is present.
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197 params = zstd.get_frame_parameters(zstd.FRAME_HEADER + b"\x04\x00")
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198 self.assertEqual(params.content_size, zstd.CONTENTSIZE_UNKNOWN)
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199 self.assertEqual(params.window_size, 1024)
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200 self.assertEqual(params.dict_id, 0)
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201 self.assertTrue(params.has_checksum)
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202
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203 # Upper 2 bits indicate content size.
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204 params = zstd.get_frame_parameters(zstd.FRAME_HEADER + b"\x40\x00\xff\x00")
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205 self.assertEqual(params.content_size, 511)
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206 self.assertEqual(params.window_size, 1024)
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207 self.assertEqual(params.dict_id, 0)
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208 self.assertFalse(params.has_checksum)
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209
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210 # Window descriptor is 2nd byte after frame header.
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211 params = zstd.get_frame_parameters(zstd.FRAME_HEADER + b"\x00\x40")
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212 self.assertEqual(params.content_size, zstd.CONTENTSIZE_UNKNOWN)
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213 self.assertEqual(params.window_size, 262144)
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214 self.assertEqual(params.dict_id, 0)
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215 self.assertFalse(params.has_checksum)
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216
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217 # Set multiple things.
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218 params = zstd.get_frame_parameters(zstd.FRAME_HEADER + b"\x45\x40\x0f\x10\x00")
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219 self.assertEqual(params.content_size, 272)
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220 self.assertEqual(params.window_size, 262144)
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221 self.assertEqual(params.dict_id, 15)
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222 self.assertTrue(params.has_checksum)
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223
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224 def test_input_types(self):
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225 v = zstd.FRAME_HEADER + b"\x00\x00"
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226
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diff changeset
227 mutable_array = bytearray(len(v))
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228 mutable_array[:] = v
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229
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230 sources = [
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231 memoryview(v),
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232 bytearray(v),
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diff changeset
233 mutable_array,
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234 ]
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235
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diff changeset
236 for source in sources:
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237 params = zstd.get_frame_parameters(source)
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238 self.assertEqual(params.content_size, zstd.CONTENTSIZE_UNKNOWN)
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239 self.assertEqual(params.window_size, 1024)
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240 self.assertEqual(params.dict_id, 0)
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diff changeset
241 self.assertFalse(params.has_checksum)