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annotate contrib/python-zstandard/NEWS.rst @ 31847:39d36c2db68e
zstd: vendor python-zstandard 0.8.1
This contains a fix for compilation on BSDs.
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author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Sat, 08 Apr 2017 14:33:20 -0700 |
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1 Version History |
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2 =============== |
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3 |
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4 0.8.1 (released 2017-04-08) |
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5 --------------------------- |
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6 |
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7 * Add #includes so compilation on OS X and BSDs works (#20). |
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8 |
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9 0.8.0 (released 2017-03-08) |
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10 --------------------------- |
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11 |
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12 * CompressionParameters now has a estimated_compression_context_size() method. |
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13 zstd.estimate_compression_context_size() is now deprecated and slated for |
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14 removal. |
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15 * Implemented a lot of fuzzing tests. |
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16 * CompressionParameters instances now perform extra validation by calling |
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17 ZSTD_checkCParams() at construction time. |
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18 * multi_compress_to_buffer() API for compressing multiple inputs as a |
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19 single operation, as efficiently as possible. |
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20 * ZSTD_CStream instances are now used across multiple operations on |
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21 ZstdCompressor instances, resulting in much better performance for |
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22 APIs that do streaming. |
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23 * ZSTD_DStream instances are now used across multiple operations on |
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24 ZstdDecompressor instances, resulting in much better performance for |
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25 APIs that do streaming. |
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26 * train_dictionary() now releases the GIL. |
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27 * Support for training dictionaries using the COVER algorithm. |
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28 * multi_decompress_to_buffer() API for decompressing multiple frames as a |
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29 single operation, as efficiently as possible. |
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30 * Support for multi-threaded compression. |
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31 * Disable deprecation warnings when compiling CFFI module. |
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32 * Fixed memory leak in train_dictionary(). |
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33 * Removed DictParameters type. |
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34 * train_dictionary() now accepts keyword arguments instead of a |
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35 DictParameters instance to control dictionary generation. |
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36 |
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37 0.7.0 (released 2017-02-07) |
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38 --------------------------- |
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39 |
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40 * Added zstd.get_frame_parameters() to obtain info about a zstd frame. |
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41 * Added ZstdDecompressor.decompress_content_dict_chain() for efficient |
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42 decompression of *content-only dictionary chains*. |
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43 * CFFI module fully implemented; all tests run against both C extension and |
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44 CFFI implementation. |
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45 * Vendored version of zstd updated to 1.1.3. |
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46 * Use ZstdDecompressor.decompress() now uses ZSTD_createDDict_byReference() |
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47 to avoid extra memory allocation of dict data. |
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48 * Add function names to error messages (by using ":name" in PyArg_Parse* |
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49 functions). |
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50 * Reuse decompression context across operations. Previously, we created a |
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51 new ZSTD_DCtx for each decompress(). This was measured to slow down |
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52 decompression by 40-200MB/s. The API guarantees say ZstdDecompressor |
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53 is not thread safe. So we reuse the ZSTD_DCtx across operations and make |
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54 things faster in the process. |
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55 * ZstdCompressor.write_to()'s compress() and flush() methods now return number |
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56 of bytes written. |
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57 * ZstdDecompressor.write_to()'s write() method now returns the number of bytes |
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58 written to the underlying output object. |
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59 * CompressionParameters instances now expose their values as attributes. |
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60 * CompressionParameters instances no longer are subscriptable nor behave |
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61 as tuples (backwards incompatible). Use attributes to obtain values. |
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62 * DictParameters instances now expose their values as attributes. |
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63 |
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64 0.6.0 (released 2017-01-14) |
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65 --------------------------- |
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66 |
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67 * Support for legacy zstd protocols (build time opt in feature). |
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68 * Automation improvements to test against Python 3.6, latest versions |
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69 of Tox, more deterministic AppVeyor behavior. |
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70 * CFFI "parser" improved to use a compiler preprocessor instead of rewriting |
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71 source code manually. |
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72 * Vendored version of zstd updated to 1.1.2. |
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73 * Documentation improvements. |
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74 * Introduce a bench.py script for performing (crude) benchmarks. |
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75 * ZSTD_CCtx instances are now reused across multiple compress() operations. |
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76 * ZstdCompressor.write_to() now has a flush() method. |
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77 * ZstdCompressor.compressobj()'s flush() method now accepts an argument to |
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78 flush a block (as opposed to ending the stream). |
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79 * Disallow compress(b'') when writing content sizes by default (issue #11). |
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80 |
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81 0.5.2 (released 2016-11-12) |
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82 --------------------------- |
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83 |
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84 * more packaging fixes for source distribution |
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85 |
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86 0.5.1 (released 2016-11-12) |
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87 --------------------------- |
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88 |
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89 * setup_zstd.py is included in the source distribution |
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90 |
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91 0.5.0 (released 2016-11-10) |
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92 --------------------------- |
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93 |
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94 * Vendored version of zstd updated to 1.1.1. |
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95 * Continuous integration for Python 3.6 and 3.7 |
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96 * Continuous integration for Conda |
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97 * Added compression and decompression APIs providing similar interfaces |
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98 to the standard library ``zlib`` and ``bz2`` modules. This allows |
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99 coding to a common interface. |
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100 * ``zstd.__version__` is now defined. |
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101 * ``read_from()`` on various APIs now accepts objects implementing the buffer |
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102 protocol. |
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103 * ``read_from()`` has gained a ``skip_bytes`` argument. This allows callers |
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104 to pass in an existing buffer with a header without having to create a |
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105 slice or a new object. |
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106 * Implemented ``ZstdCompressionDict.as_bytes()``. |
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107 * Python's memory allocator is now used instead of ``malloc()``. |
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108 * Low-level zstd data structures are reused in more instances, cutting down |
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109 on overhead for certain operations. |
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110 * ``distutils`` boilerplate for obtaining an ``Extension`` instance |
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111 has now been refactored into a standalone ``setup_zstd.py`` file. This |
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112 allows other projects with ``setup.py`` files to reuse the |
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113 ``distutils`` code for this project without copying code. |
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114 * The monolithic ``zstd.c`` file has been split into a header file defining |
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115 types and separate ``.c`` source files for the implementation. |
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116 |
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117 History of the Project |
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118 ====================== |
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119 |
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120 2016-08-31 - Zstandard 1.0.0 is released and Gregory starts hacking on a |
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121 Python extension for use by the Mercurial project. A very hacky prototype |
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122 is sent to the mercurial-devel list for RFC. |
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123 |
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124 2016-09-03 - Most functionality from Zstandard C API implemented. Source |
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125 code published on https://github.com/indygreg/python-zstandard. Travis-CI |
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126 automation configured. 0.0.1 release on PyPI. |
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127 |
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128 2016-09-05 - After the API was rounded out a bit and support for Python |
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129 2.6 and 2.7 was added, version 0.1 was released to PyPI. |
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130 |
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131 2016-09-05 - After the compressor and decompressor APIs were changed, 0.2 |
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132 was released to PyPI. |
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133 |
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134 2016-09-10 - 0.3 is released with a bunch of new features. ZstdCompressor |
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135 now accepts arguments controlling frame parameters. The source size can now |
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136 be declared when performing streaming compression. ZstdDecompressor.decompress() |
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137 is implemented. Compression dictionaries are now cached when using the simple |
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138 compression and decompression APIs. Memory size APIs added. |
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139 ZstdCompressor.read_from() and ZstdDecompressor.read_from() have been |
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140 implemented. This rounds out the major compression/decompression APIs planned |
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141 by the author. |
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142 |
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143 2016-10-02 - 0.3.3 is released with a bug fix for read_from not fully |
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144 decoding a zstd frame (issue #2). |
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145 |
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146 2016-10-02 - 0.4.0 is released with zstd 1.1.0, support for custom read and |
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147 write buffer sizes, and a few bug fixes involving failure to read/write |
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148 all data when buffer sizes were too small to hold remaining data. |
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149 |
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150 2016-11-10 - 0.5.0 is released with zstd 1.1.1 and other enhancements. |