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annotate contrib/python-zstandard/tests/test_data_structures.py @ 31796:e0dc40530c5a

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zstd: vendor python-zstandard 0.8.0 Commit 81e1f5bbf1fc54808649562d3ed829730765c540 from https://github.com/indygreg/python-zstandard is imported without modifications (other than removing unwanted files). Updates relevant to Mercurial include: * Support for multi-threaded compression (we can use this for bundle and wire protocol compression). * APIs for batch compression and decompression operations using multiple threads and optimal memory allocation mechanism. (Can be useful for revlog perf improvements.) * A ``BufferWithSegments`` type that models a single memory buffer containing N discrete items of known lengths. This type can be used for very efficient 0-copy data operations. # no-check-commit
author Gregory Szorc <gregory.szorc@gmail.com>
date Sat, 01 Apr 2017 15:24:03 -0700
parents c32454d69b85
children b1fb341d8a61
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1 try:
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2 import unittest2 as unittest
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3 except ImportError:
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4 import unittest
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5
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6 import zstd
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7
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8 from . common import (
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9 make_cffi,
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10 )
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11
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12
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13 @make_cffi
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14 class TestCompressionParameters(unittest.TestCase):
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15 def test_init_bad_arg_type(self):
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16 with self.assertRaises(TypeError):
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17 zstd.CompressionParameters()
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18
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19 with self.assertRaises(TypeError):
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20 zstd.CompressionParameters(0, 1)
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21
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22 def test_bounds(self):
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23 zstd.CompressionParameters(zstd.WINDOWLOG_MIN,
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24 zstd.CHAINLOG_MIN,
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25 zstd.HASHLOG_MIN,
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26 zstd.SEARCHLOG_MIN,
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27 zstd.SEARCHLENGTH_MIN + 1,
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28 zstd.TARGETLENGTH_MIN,
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29 zstd.STRATEGY_FAST)
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30
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31 zstd.CompressionParameters(zstd.WINDOWLOG_MAX,
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32 zstd.CHAINLOG_MAX,
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33 zstd.HASHLOG_MAX,
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34 zstd.SEARCHLOG_MAX,
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35 zstd.SEARCHLENGTH_MAX - 1,
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36 zstd.TARGETLENGTH_MAX,
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37 zstd.STRATEGY_BTOPT)
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38
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39 def test_get_compression_parameters(self):
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40 p = zstd.get_compression_parameters(1)
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41 self.assertIsInstance(p, zstd.CompressionParameters)
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42
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43 self.assertEqual(p.window_log, 19)
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44
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45 def test_members(self):
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46 p = zstd.CompressionParameters(10, 6, 7, 4, 5, 8, 1)
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47 self.assertEqual(p.window_log, 10)
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48 self.assertEqual(p.chain_log, 6)
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49 self.assertEqual(p.hash_log, 7)
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50 self.assertEqual(p.search_log, 4)
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51 self.assertEqual(p.search_length, 5)
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52 self.assertEqual(p.target_length, 8)
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53 self.assertEqual(p.strategy, 1)
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54
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55 def test_estimated_compression_context_size(self):
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56 p = zstd.CompressionParameters(20, 16, 17, 1, 5, 16, zstd.STRATEGY_DFAST)
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57
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58 # 32-bit has slightly different values from 64-bit.
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59 self.assertAlmostEqual(p.estimated_compression_context_size(), 1287076,
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60 delta=110)
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61
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62
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63 @make_cffi
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64 class TestFrameParameters(unittest.TestCase):
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65 def test_invalid_type(self):
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66 with self.assertRaises(TypeError):
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67 zstd.get_frame_parameters(None)
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68
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69 with self.assertRaises(TypeError):
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70 zstd.get_frame_parameters(u'foobarbaz')
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71
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72 def test_invalid_input_sizes(self):
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73 with self.assertRaisesRegexp(zstd.ZstdError, 'not enough data for frame'):
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74 zstd.get_frame_parameters(b'')
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75
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76 with self.assertRaisesRegexp(zstd.ZstdError, 'not enough data for frame'):
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77 zstd.get_frame_parameters(zstd.FRAME_HEADER)
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78
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79 def test_invalid_frame(self):
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80 with self.assertRaisesRegexp(zstd.ZstdError, 'Unknown frame descriptor'):
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81 zstd.get_frame_parameters(b'foobarbaz')
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82
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83 def test_attributes(self):
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84 params = zstd.get_frame_parameters(zstd.FRAME_HEADER + b'\x00\x00')
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85 self.assertEqual(params.content_size, 0)
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86 self.assertEqual(params.window_size, 1024)
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87 self.assertEqual(params.dict_id, 0)
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88 self.assertFalse(params.has_checksum)
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89
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90 # Lowest 2 bits indicate a dictionary and length. Here, the dict id is 1 byte.
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91 params = zstd.get_frame_parameters(zstd.FRAME_HEADER + b'\x01\x00\xff')
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92 self.assertEqual(params.content_size, 0)
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93 self.assertEqual(params.window_size, 1024)
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94 self.assertEqual(params.dict_id, 255)
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95 self.assertFalse(params.has_checksum)
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96
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97 # Lowest 3rd bit indicates if checksum is present.
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98 params = zstd.get_frame_parameters(zstd.FRAME_HEADER + b'\x04\x00')
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99 self.assertEqual(params.content_size, 0)
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100 self.assertEqual(params.window_size, 1024)
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101 self.assertEqual(params.dict_id, 0)
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102 self.assertTrue(params.has_checksum)
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103
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104 # Upper 2 bits indicate content size.
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105 params = zstd.get_frame_parameters(zstd.FRAME_HEADER + b'\x40\x00\xff\x00')
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106 self.assertEqual(params.content_size, 511)
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107 self.assertEqual(params.window_size, 1024)
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108 self.assertEqual(params.dict_id, 0)
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109 self.assertFalse(params.has_checksum)
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110
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111 # Window descriptor is 2nd byte after frame header.
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112 params = zstd.get_frame_parameters(zstd.FRAME_HEADER + b'\x00\x40')
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113 self.assertEqual(params.content_size, 0)
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114 self.assertEqual(params.window_size, 262144)
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115 self.assertEqual(params.dict_id, 0)
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116 self.assertFalse(params.has_checksum)
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117
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118 # Set multiple things.
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119 params = zstd.get_frame_parameters(zstd.FRAME_HEADER + b'\x45\x40\x0f\x10\x00')
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120 self.assertEqual(params.content_size, 272)
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121 self.assertEqual(params.window_size, 262144)
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122 self.assertEqual(params.dict_id, 15)
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123 self.assertTrue(params.has_checksum)